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3, ix, 412 p
Topics: 'grel pa, drang nges rnam 'byed legs bshad snying po/
3, [2], 314 p
Topics: dgongs 'grel, dbu ma la 'jug pa/
Data crawled by Alexa Internet on behalf of Alexa Internet from Wed Dec 23 19:37:33 PDT 2009 to Thu Dec 24 07:30:46 PDT 2009
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U.S. Congress
by Committee on Transportation
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Congressional Hearing Committee on Transportation Date: 2009-05-13 Room: 2167 Rayburn HOB
Topic: Committee on Transportation
Congressional Hearing Committee on the Judiciary Date: 2009-01-27 Room: 2141 Rayburn HOB
Topic: Committee on the Judiciary
PubMed Central
by Mehta, Shruti H.; Vogt, Samantha L.; Srikrishnan, Aylur K.; Vasudevan, Conjeevaram K.; Murugavel, Kalilapuri G.; Saravanan, Shanmugam; Anand, Santhanam; Kumar, M. Suresh; Ray, Stuart C.; Celentano, David D.; Solomon, Suniti; Solomon, Sunil S.
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This article is from The Indian Journal of Medical Research , volume 132 . Abstract Background & Objectives:: We characterized HCV antibody prevalence, viral persistence, genotype and liver disease prevalence among IDUs in Chennai, India as the study of the association of HIV with each of these states is important and there are no data available. Methods:: Between 2005-2006, 1158 IDUs were recruited and followed semi-annually. All were tested for HCV antibodies at baseline; a random sample...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3102459
PubMed Central
by Sahu, Rabi Narayan; Kumar, Raj; Mahapatra, A. K.
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This article is from Journal of Pediatric Neurosciences , volume 4 . Abstract Infection of the central nervous system is a life-threatening condition in the pediatric population. Almost all agents can cause infection within the central nervous system and the extent of infection ranges from diffuse involvement of the meninges, brain, or the spinal cord to localized involvement presenting as a space-occupying lesion. Modern imaging techniques define the anatomic region infected, the evolution of...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3162832
PubMed Central
by Schwank, Mike; Wiesmann, Andreas; Werner, Charles; Matzler, Christian; Weber, Daniel; Murk, Axel; Volksch, Ingo; Wegmuller, Urs
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This article is from Sensors (Basel, Switzerland) , volume 10 . Abstract L-band (1–2 GHz) microwave radiometry is a remote sensing technique that can be used to monitor soil moisture, and is deployed in the Soil Moisture and Ocean Salinity (SMOS) Mission of the European Space Agency (ESA). Performing ground-based radiometer campaigns before launch, during the commissioning phase and during the operative SMOS mission is important for validating the satellite data and for the further...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3270857
PubMed Central
by Germano, Jose; Martins, Veronica C.; Cardoso, Filipe A.; Almeida, Teresa M.; Sousa, Leonel; Freitas, Paulo P.; Piedade, Moises S.
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This article is from Sensors (Basel, Switzerland) , volume 9 . Abstract This paper presents a prototype of a platform for biomolecular recognition detection. The system is based on a magnetoresistive biochip that performs biorecognition assays by detecting magnetically tagged targets. All the electronic circuitry for addressing, driving and reading out signals from spin-valve or magnetic tunnel junctions sensors is implemented using off-the-shelf components. Taking advantage of digital signal...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3291901
PubMed Central
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This article is from Sensors (Basel, Switzerland) , volume 9 . Abstract Camera calibration is a crucial prerequisite for the retrieval of metric information from images. The problem of camera calibration is the computation of camera intrinsic parameters (i.e., coefficients of geometric distortions, principle distance and principle point) and extrinsic parameters (i.e., 3D spatial orientations: ω, ϕ, κ, and 3D spatial translations: tx, ty, tz). The intrinsic camera calibration (i.e., interior...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3291927
This article is from Sensors (Basel, Switzerland) , volume 9 . Abstract Existing 3-dimensional acoustic target tracking methods that use wired/wireless networked sensor nodes to track targets based on four sensing coverage do not always compute the feasible spatio-temporal information of target objects. To investigate this discrepancy in a formal setting, we propose a geometric model of the target tracking problem alongside its equivalent geometric dual model that is easier to solve. We then...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3290477
PubMed Central
by Mathur, Rinku; Bhat, Manohar; V, Satish; Parvez, Mohd
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This article is from International Journal of Clinical Pediatric Dentistry , volume 2 . Abstract Background: A family case report of cleidocranial dysplasia (CCD) with varied manifestations from father to three siblings is presented. CCD ( MIM # 119600) is a rare autosomal dominant skeletal dysplasia caused by CBAF1 gene ( OMIM 600211) with a wide range of variability. In all the cases generalized dysplasia in bone, prolonged retention of primary teeth and delayed eruption of permanent teeth...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4086567
PubMed Central
by Philbrick, Ann M.; Newkirk, Erin N.; Farris, Karen B.; McDanel, Deanna L.; Horner, Kathleen E.
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This article is from Pharmacy Practice , volume 7 . Abstract Objective:: The purpose of this study was to quantify quit rates, determine factors predicting success, and analyze patients’ perceptions at 3 months after participation in the pharmacist-managed Smoking Cessation Group Clinic. Methods:: This was a prospective, single group study that was conducted in patients that had participated in the Smoking Cessation Group Clinic at the University of Iowa Hospitals and Clinics. Clinic...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4139046
PubMed Central
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This article is from Sensors (Basel, Switzerland) , volume 9 . Abstract The crowning objective of this research was to identify a better cloud classification method to upgrade the current window-based clustering algorithm used operationally for China’s first operational geostationary meteorological satellite FengYun-2C (FY-2C) data. First, the capabilities of six widely-used Artificial Neural Network (ANN) methods are analyzed, together with the comparison of two other methods: Principal...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3274136
PubMed Central
by Cekmez, Ferhat; Karademir, Ferhan; Tanju, I. Asya; Meral, Cihan; Pirgon, Ozgur; Ozyurt, Mustafa; Gocmen, Ismail
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This article is from International Journal of Biomedical Science : IJBS , volume 5 . Abstract Streptococcus pneumonia is an increasing problem worldwide and nasopharyngeal colonization plays an important role in pneumococcal infections. The aims of this study were to assess the nasopharyngeal colonization rate, investigate the risk factors for nasopharyngeal colonization with S. pneumonia, serogroup and penicillin susceptibility patterns of Streptococcus pneumoniae strains isolated from healthy...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3614764
PubMed Central
by Webster, Ingrid; Friedrich, Sven O; Lochner, Amanda; Huisamen, Barbara
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This article is from Cardiovascular Journal of Africa , volume 21 . Abstract Summary: Activation of AMP-activated protein kinase (AMPK) results in glucose transporter 4 (GLUT4) translocation from the cytosol to the cell membrane, and glucose uptake in the skeletal muscles. This increased activation of AMPK can be stimulated by a pharmacological agent, AICAR (5’-aminoimidazole-4-carboxamide ribonucleoside), which is converted intracellularly into ZMP...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3734761
PubMed Central
by SASAKI, Naoki; TSUZUKI, Nao; YAMADA, Michiaki; MINAMI, Takuto; YAMADA, Haruo
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This article is from Journal of equine science , volume 20 . Abstract This study aimed to establish a standard dose and sample collection time for 13C phenylalanine and 13C-Dipeptide breath test in horses. To evaluate dose-dependent effects, healthy horses received 2.5 mg/kg, 5 mg/kg, and 10 mg/kg 13C phenylalanine dissolved in 1 ml/kg distilled water and 1.25 mg/kg, 2.5 mg/kg, and 5 mg/kg 13C dipeptide dissolved in 2 ml/ kg distilled water. Tmax was observed during the sample collection time....
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4013957
PubMed Central
by Li, Dawei; He, Guang; Xu, Yifeng; Duan, Yun; Gu, Niufan; Li, Xingwang; Shi, Yongyong; Qin, Wei; Feng, Guoyin; He, Lin
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This article is from Genetics and Molecular Biology , volume 32 . Abstract ERBB3 (v-erb-b2 erythroblastic leukemia viral oncogene homolog 3), encoding a receptor of neuregulin-1 (NRG1), has been considered a functional candidate gene for schizophrenia susceptibility. In order to investigate a relationship between ERBB3 gene and schizophrenia in the Chinese population, case-control and family-based studies were carried out in 470 cases matched by controls, and in 532 family trios. Our results...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3036886
PubMed Central
by Wigner, Nathan A; Luderer, Hilary F; Cox, Megan K; Sooy, Karen; Gerstenfeld, Louis C; Demay, Marie B
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This article is from Journal of Bone and Mineral Research , volume 25 . Abstract Hypophosphatemia leads to rickets and osteomalacia, the latter of which results in decreased biomechanical integrity of bones, accompanied by poor fracture healing. Impaired phosphate-dependent apoptosis of hypertrophic chondrocytes is the molecular basis for rickets. However, the underlying pathophysiology of impaired fracture healing has not been characterized previously. To address the role of phosphate in...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3153327
PubMed Central
by Adnane, Mourad; Jiang, Zhongwei; Choi, Samjin; Jang, Hoyoung
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This article is from Sensors (Basel, Switzerland) , volume 9 . Abstract In this paper, a new method for the detection of apnea/hypopnea periods in physiological data is presented. The method is based on the intelligent combination of an integrated sensor system for long-time cardiorespiratory signal monitoring and dedicated signal-processing packages. Integrated sensors are a PVDF film and conductive fabric sheets. The signal processing package includes dedicated respiratory cycle (RC) and QRS...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3286826
PubMed Central
by Shutova, M.V.; Bogomazova, A.N.; Lagarkova, M.A.; Kiselev, S.L.
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This article is from Acta Naturae , volume 1 . Abstract Cell biology is one of the most rapidly developing branches in modern biology. The most interesting stages in early embryonic development for cell biology are those when a large number of cells are pluripotent. Inner-cell mass of blastocyst can be cultivated in vitro, and these cells are called embryonic stem cells. They are able to differentiate into different types of cells and tissues. But the greatest interest for practical application...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3347519
Maine State Documents
by Maine Department of Environmental Protection; Maine Jobs Council; Maine Bureau of Unemployment Services
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Topic: Environmental Protection Documents
Source: http://statedocs.maine.gov/dep_docs/82
Maine State Documents
by Maine Public Employees Retirement System; Center for Workforce Research and Information; Laundrie, Steven P.; Haynes, Natalie
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Topic: Public Employees Retirement System Documents
Source: http://statedocs.maine.gov/mainepers_docs/44
Maine State Documents
by Maine Center for Disease Control and Prevention; Office of Fiscal and Program Review; Pennoyer, Grant T.
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Topic: Center for Disease Control Documents
Source: http://statedocs.maine.gov/mecdc_docs/48
PubMed Central
by KOYAGO, Masanori; NAKADA, Ken; TSUNODA, Nobuo; MORIYOSHI, Masaharu; SAWAMUKAI, Yutaka
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This article is from Journal of equine science , volume 20 . Abstract To clarify the physiological changes of sperm morphology in active Thoroughbred stallions during the breeding season, we examined the dismount semen collected from the penile urethra immediately after service. The spermatozoa were analyzed for relationships between the morphology and the stallion’s age or the number of services. Seasonal variation was apparent in the rate of the sperm tail abnormalities, spermatozoa with...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4013956
PubMed Central
by Al-Ahmed, Amir; Ndangili, Peter M.; Jahed, Nazeem; Baker, Priscilla G. L.; Iwuoha, Emmanuel I.
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This article is from Sensors (Basel, Switzerland) , volume 9 . Abstract A novel enzyme immobilization platform was prepared on a platinum disk working electrode by polymerizing aniline inside the interstitial pores of polyester sulphonic acid sodium salt (PESA). Scanning electron microscopy study showed the formation of homogeneous sulphonated polyaniline (PANI) nanotubes (∼90 nm) and thermogravimetric analysis (TGA) confirmed that the nanotubes were stable up to 230 °C. The PANI:PESA...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3267205
This article is from Sensors (Basel, Switzerland) , volume 9 . Abstract In order to investigate the physiological effect of transfected cell immobilization in calcium alginate gels, we immobilized electroporated Vero cells in gels shaped either as spherical beads or as thin membrane layers. In addition, we investigated whether serum addition had a positive effect on cell proliferation and viability in either gel configuration. The gels were stored for four weeks in a medium supplemented or not...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3280752
PubMed Central
by Li, Dongling; Wen, Zhiyu; Wen, Zhongquan; He, Xuefeng; Yang, Yinchuan; Shang, Zhengguo
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This article is from Sensors (Basel, Switzerland) , volume 9 . Abstract A novel high-precision vacuum microelectronic accelerometer has been successfully fabricated and tested in our laboratory. This accelerometer has unique advantages of high sensitivity, fast response, and anti-radiation stability. It is a prototype intended for navigation applications and is required to feature micro-g resolution. This paper briefly describes the structure and working principle of our vacuum microelectronic...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3291900
PubMed Central
by Kelley, Jennifer Munro; Hamelberg, Donald
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This article is from Nucleic Acids Research , volume 38 . Abstract Many bacterial genes are controlled by metabolite sensing motifs known as riboswitches, normally located in the 5′ un-translated region of their mRNAs. Small molecular metabolites bind to the aptamer domain of riboswitches with amazing specificity, modulating gene regulation in a feedback loop as a result of induced conformational changes in the expression platform. Here, we report the results of molecular dynamics simulation...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3303485
PubMed Central
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This article is from Journal of Family & Community Medicine , volume 16 . Abstract A 46-year-old female is the first to be described from Saudi Arabia with a right coronary artery aneurysm associated with chest pain. A review of the coronary aneurysm is discussed with its implications on our patient.
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3377034
PubMed Central
by Zhao, Dan; Xu, Qin-gan; Chen, Xin-ming; Fan, Ming-wen
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This article is from International Journal of Oral Science , volume 1 . Abstract Aim: There is an increasing evidence for the role of high risk human papillomavirus (HPV) in the pathogenesis of oral squamous cell carcinoma (OSCC). The purpose of this study is to evaluate the relevance of HPV infection to the survival and prognosis of OSCC. Methodology: Fifty-two patients with OSCC were followed from 4 to 88 months with a median of 50.7 months. HPV DNA was identified in formalin-fixed,...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3475584
PubMed Central
by Swaminathan, M; Stuart, M; Hughes, G C; Jaggers, J; Hill, S E; Milano, C A; Bennett-Guerrero, E; Stafford-Smith, M
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This article is from HSR Proceedings in Intensive Care & Cardiovascular Anesthesia , volume 1 . Abstract Introduction: New evidence of potential risks of aprotinin in 2006 generated public concern about a previously approved drug that was routinely used. In response, we assembled a team of experts within the institution to form guidelines for the appropriate use of aprotinin in cardiac surgery. We report the basis for the guidelines, their implementation, follow-up and resulting patterns of...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3484539
PubMed Central
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This article is from Journal of Reproduction & Infertility , volume 10 . Abstract Introduction: Pain experienced during labor is probably the most painful event in the lives of women. Environment itself influences a mother's experience of pain. Tension and stress resulting from pregnancy crisis and labor increase when the mother is hospitalized, which is concomitant with stressful situations and factors that affect pain perception during labor. The purpose of this study was to explore...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3719331
Data crawled by Alexa Internet on behalf of Alexa Internet from Sun Dec 20 23:10:20 PDT 2009 to Mon Dec 21 01:42:14 PDT 2009
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Data crawled by Alexa Internet on behalf of Alexa Internet from Sat Aug 29 19:15:38 PDT 2009 to Tue Sep 08 22:47:09 PDT 2009
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2, (xxv-xxix), 199 p
Topics: don bsdus, sher phyin
U.S. Congress
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Congressional Hearing Committee on Natural Resources Date: 2009-04-01 Room: 2154 Rayburn HOB
Topic: Committee on Natural Resources
Buddhist Digital Resource Center
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3, 2, 3, 377 p
Topics: gsung 'bum, dge lugs
Data crawled by Alexa Internet on behalf of Alexa Internet from Sat Dec 19 22:46:25 PDT 2009 to Sun Dec 20 00:27:14 PDT 2009
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Yoshimi Matsuura Interview
by Twin Cities JACL Collection
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Interview location: Bloomington, Minnesota Experiences serving in Japan Segment 27 of 28 [ Previous segment ] -- [ Next segment ] For more information, visit Densho
Topics: Japanese Americans, Oral history
John Wakamatsu Interview
by Manzanar National Historic Site Collection
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Interview location: Culver City, California Father's family background Segment 2 of 7 [ Previous segment ] -- [ Next segment ] For more information, visit Densho
Topics: Japanese Americans, Oral history
Ann Sugimoto Interview
by Manzanar National Historic Site Collection
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Interview location: Culver City, California Meeting future husband Segment 14 of 35 [ Previous segment ] -- [ Next segment ] For more information, visit Densho
Topics: Japanese Americans, Oral history
Mary Kageyama Nomura Interview
by Densho Visual History Collection
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Interview location: Torrance, California Brother's work with the guayule project in camp Segment 23 of 29 [ Previous segment ] -- [ Next segment ] For more information, visit Densho
Topics: Japanese Americans, Oral history, Manzanar
Arxiv.org
by Alexei Kovalev
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A class of examples of Riemannian metrics with holonomy G_2 on compact 7-manifolds was constructed by the author in arXiv:math.DG/0012189 and later in a joint work with N.-H. Lee in arXiv:0810.0957, using a certain `generalized connected sum' of two asymptotically cylindrical manifolds with holonomy SU(3). We consider, on each of the two initial SU(3)-manifolds, a fibration arising from a Lefschetz pencil of K3 surfaces. The gluing of the two K3 fibrations yields a coassociative fibration of...
Source: http://arxiv.org/abs/math/0511150v2
Arxiv.org
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In this paper, we study the dynamical aspects of the \emph{Hamiltonian homeomorphism group} $Hameo(M,\omega)$ which was introduced by M\"uller and the author. We introduce the notion of autonomous continuous Hamiltonian flows and extend the well-known conservation of energy to such flows. The definitions of the Hofer length and of the spectral invariants $\rho_a$ are extended to continuous Hamiltonian paths, and the Hofer norm and the spectral norm $\gamma:Ham(M,\omega) \to \R_+$ are...
Source: http://arxiv.org/abs/math/0601200v6
Arxiv.org
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A scheme is proposed to generate an entangled state between two (Lambda-type) four-level atoms that interact effectively by means of a detuned optical cavity and a laser beam that acts perpendicularly to the cavity axis. It is shown how the degree of entanglement for two atoms passing through the cavity can be controlled by manipulating their velocity and the (initial) distance between the atoms. In addition, three realistic schemes are suggested to implement the two-qubit gates within the...
Source: http://arxiv.org/abs/0809.2247v3
Arxiv.org
by F. Carrier; S. Saesen; M. Cherix; G. Bourban; G. Burki; J. Debosscher; D. Debruyne; P. Gruyters; L. M. Sarro; M. Spano; L. Weber
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A campaign on the open cluster NGC 5617 was organized in order to characterize the pulsations and to better understand the internal structure of its stars. The variability of the cluster members was never studied before. We present the observations taken and an up-to-date analysis of the obtained time series, especially of several SPB candidates we discovered.
Source: http://arxiv.org/abs/0901.0627v1
Arxiv.org
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The most recent results and some of the open key questions on the evolution of early-type galaxies are reviewed in the general cosmological context of massive galaxy formation.
Source: http://arxiv.org/abs/0901.1457v1
Arxiv.org
by Frederic Didier
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We present a practical algorithm to decode erasures of Reed-Solomon codes over the q elements binary field in O(q \log_2^2 q) time where the constant implied by the O-notation is very small. Asymptotically fast algorithms based on fast polynomial arithmetic were already known, but even if their complexity is similar, they are mostly impractical. By comparison our algorithm uses only a few Walsh transforms and has been easily implemented.
Source: http://arxiv.org/abs/0901.1886v1
Arxiv.org
by Yuichiro Hida; Hiromichi Nakazato; Kazuya Yuasa; Yasser Omar
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A scheme for generating an entangled state in a two spin-1/2 system by means of a spin-dependent potential scattering of another qubit is presented and analyzed in three dimensions. The entanglement is evaluated in terms of the concurrence both at the lowest and in full order in perturbation with an appropriate renormalization for the latter, and its characteristics are discussed in the context of (in)distinguishability of alternative paths for a quantum particle.
Source: http://arxiv.org/abs/0901.2199v2
Arxiv.org
by Martin Gorbahn; Sebastian Jager; Ulrich Nierste; Stephanie Trine
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We match the Higgs sector of the most general flavour breaking and CP violating minimal supersymmetric standard model (MSSM) onto a generic two-Higgs-doublet model, paying special attention to the definition of tan beta in the effective theory. In particular no tan beta-enhanced loop corrections appear in the relation to tan beta defined in the DRbar scheme in the MSSM. The corrections to the Higgs-mediated flavour-changing amplitudes which result from this matching are especially relevant for...
Source: http://arxiv.org/abs/0901.2065v1
Arxiv.org
by L. Grenet; M. Jamet; P. Noé; V. Calvo; J. -M. Hartmann; L. E. Nistor; B. Rodmacq; S. Auffret; P. Warin; Y. Samson
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In this letter, we show efficient electrical spin injection into a SiGe based \textit{p-i-n} light emitting diode from the remanent state of a perpendicularly magnetized ferromagnetic contact. Electron spin injection is carried out through an alumina tunnel barrier from a Co/Pt thin film exhibiting a strong out-of-plane anisotropy. The electrons spin polarization is then analysed through the circular polarization of emitted light. All the light polarization measurements are performed without an...
Source: http://arxiv.org/abs/0901.2183v1
Arxiv.org
by E. A. Hoffmann; H. A. Nilsson; J. E. Matthews; N. Nakpathomkun; A. I. Persson; L. Samuelson; H. Linke
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When a quantum dot is subjected to a thermal gradient, the temperature of electrons entering the dot can be determined from the dot's thermocurrent if the conductance spectrum and background temperature are known. We demonstrate this technique by measuring the temperature difference across a 15 nm quantum dot embedded in a nanowire. This technique can be used when the dot's energy states are separated by many kT and will enable future quantitative investigations of electron-phonon interaction,...
Source: http://arxiv.org/abs/0901.2383v1
Arxiv.org
by Tomasz R. Bielecki; Monique Jeanblanc; Marek Rutkowski
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In the paper we study dynamics of the arbitrage prices of credit default swaps within a hazard process model of credit risk. We derive these dynamics without postulating that the immersion property is satisfied between some relevant filtrations. These results are then applied so to study the problem of replication of general defaultable claims, including some basket claims, by means of dynamic trading of credit default swaps.
Source: http://arxiv.org/abs/0901.2390v1
Arxiv.org
by B. Mehlig; M. Wilkinson; V. Bezuglyy; K. Gustavsson; K. Nakamura
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We consider the diffusion of independent particles experiencing random accelerations by a space- and time-dependent force as well as viscous damping. This model can exhibit several asymptotic behaviours, depending upon the limiting cases which are considered, some of which have been discussed in earlier work. Here we explore the full space of dimensionless parameters, and introduce an "asymptotic phase diagram" which delineates the limiting regimes.
Source: http://arxiv.org/abs/0901.3077v1
Arxiv.org
by Raymond Stora
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Renormalized perturbation theory \`a la BPHZ can be founded on causality as analyzed by H. Epstein and V. Glaser in the seventies. Here, we list and discuss a number of additional constraints of algebraic character some of which have to be considered as parts of the core of the BPHZ framework.
Source: http://arxiv.org/abs/0901.3426v1
Arxiv.org
by S. Paulin-Henriksson; A. Refregier; A. Amara
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We investigate the impact of point spread function (PSF) fitting errors on cosmic shear measurements using the concepts of complexity and sparsity. Complexity, introduced in a previous paper, characterizes the number of degrees of freedom of the PSF. For instance, fitting an underlying PSF with a model with low complexity will lead to small statistical errors on the model parameters, however these parameters could suffer from large biases. Alternatively, fitting with a large number of...
Source: http://arxiv.org/abs/0901.3557v2
Arxiv.org
by Claire I. Levaillant; David B. Wales
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We show that the Lawrence-Krammer representation based on two parameters that was used by Bigelow and independently Krammer to show the linearity of the braid group is generically irreducible, but that when its parameters are specialized to some nonzero complex numbers, the representation is reducible. To do so, we construct a representation of the BMW algebra inside the Lawrence-Krammer space. As a representation of the braid group, this representation is equivalent to the Lawrence-Krammer...
Source: http://arxiv.org/abs/0901.3856v1
Arxiv.org
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Given a bipartite system, correlations between its subsystems can be understood as information that each one carries about the other. In order to give a model-independent description of secure information disposal, we propose the paradigm of private quantum decoupling, corresponding to locally reducing correlations in a given bipartite quantum state without transferring them to the environment. In this framework, the concept of private local randomness naturally arises as a resource, and total...
Source: http://arxiv.org/abs/0901.4506v5
Arxiv.org
by E. Rigliaco; A. Natta; S. Randich; G. Sacco
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The photoevaporation of circumstellar disks is a powerful process in the disk dissipation at the origin of the Orion proplyds. This Letter reports the first detection of a photoevaporating disk in the final but long-lasting phase of its evolution. The disk is associated to a low-mass T Tauri member of the sigma Orionis Cluster. It is characterized by a very low (if any) accretion rate and by a tenuous (Mloss ~ 10^{-9} Msun/yr) photoevaporation wind, which is unambiguously detected in the...
Source: http://arxiv.org/abs/0902.0457v1
Arxiv.org
by Vladlen G. Shvedov; Anton S. Desyatnikov; Andrei V. Rode; Wieslaw Z. Krolikowski; Yuri S. Kivshar
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We introduce a novel approach for all-optical trapping and manipulation of absorbing aerosol particles based on a photophoretic force. We demonstrate experimentally, in open air, the robust three-dimensional guiding of agglomerates of carbon nanoparticles with the size spanned for two orders of magnitude, from 100 nanometers to 10 microns, over the distances of a few millimeters, as well as their acceleration up to velocities of 1 cm/s and simultaneous trapping of a large number of particles.
Source: http://arxiv.org/abs/0902.1205v1
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A general nonlinear logistic equation has been proposed to model long-time saturation in industrial growth. An integral solution of this equation has been derived for any arbitrary degree of nonlinearity. A time scale for the onset of nonlinear saturation in industrial growth can be estimated from an equipartition condition between nonlinearity and purely exponential growth. Precise predictions can be made about the limiting values of the annual revenue and the human resource content that an...
Source: http://arxiv.org/abs/0903.0282v1
We assign to each nondegenerate Hamiltonian on a closed symplectic manifold a Floer-theoretic quantity called its "boundary depth," and establish basic results about how the boundary depths of different Hamiltonians are related. As applications, we prove that certain Hamiltonian symplectomorphisms supported in displaceable subsets have infinitely many nontrivial geometrically distinct periodic points, and we also significantly expand the class of coisotropic submanifolds which are...
Source: http://arxiv.org/abs/0903.0903v2
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by S. Catani; L. Cieri; G. Ferrera; D. de Florian; M. Grazzini
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We consider QCD radiative corrections to the production of W and Z bosons in hadron collisions. We present a fully exclusive calculation up to next-to-next-to-leading order (NNLO) in QCD perturbation theory. To perform this NNLO computation, we use a recently proposed version of the subtraction formalism. The calculation includes the gamma-Z interference, finite-width effects, the leptonic decay of the vector bosons and the corresponding spin correlations. Our calculation is implemented in a...
Source: http://arxiv.org/abs/0903.2120v1
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Many objects on the sky exhibit a centrosymmetric polarization pattern, particularly in cases involving single scattering around a central source. Utilizing a novel liquid crystal device (the ``theta cell'') that transforms the coordinate system of linear polarization in an image plane from Cartesian to polar, the observation of centrosymmetric polarization patterns can be improved: instead of measuring Stokes Q and U on the sky, one only needs to measure Stokes Q' in the new instrument...
Source: http://arxiv.org/abs/0903.2734v1
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by Chang-Bo Sun; Jia-Ling Wang; Xin-Zhou Li
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The viscous Cardassian cosmology is discussed, assuming that there is a bulk viscosity in the cosmic fluid. The dynamical analysis indicates that there exists a singular curve in the phase diagram of viscous Cardassian model. In the viscous PL model, the equation-of-state parameter $w_{k}$ is no longer a constant and it can cross the cosmological constant divide $w_{\Lambda}=-1$, in contrast with same problem of the ordinary PL model. Other models possess with similar characteristics. For MP...
Source: http://arxiv.org/abs/0903.3087v1
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by N. Hauptmann; M. Becker; J. Kroeger; R. Berndt
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A yet unknown surface reconstruction of V3Si(001), which is most likely induced by carbon, is used to investigate the quasi-particle energy gap at the atomic scale by a cryogenic scanning tunneling microscope. The width of the gap was virtually not altered at and close to carbon impurities, nor did it change at different sites of the reconstructed surface lattice. A remarkable modification of the spectroscopic signature of the gap was induced, however, upon moving the tip of the microscope into...
Source: http://arxiv.org/abs/0903.3286v1
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by N. R. Rowell; N. C. Hambly; P. Bergeron
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We present the techniques and early results of our program to measure the luminosity function for White Dwarfs in the SuperCOSMOS Sky Survey. Our survey covers over three quarters of the sky to a mean depth of I~19.2, and finds ~9,500 Galactic disk WD candidates on applying a conservative lower tangential velocity cut of 30kms^-1. Novel techniques introduced in this survey include allowing the lower proper motion limit to vary according to apparent magnitude, fully exploiting the accuracy of...
Source: http://arxiv.org/abs/0903.4065v1
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A key measure that has been used extensively in analyzing complex networks is the degree of a node (the number of the node's neighbors). Because of its discrete nature, when the degree measure was used in analyzing weighted networks, weights were either ignored or thresholded in order to retain or disregard an edge. Therefore, despite its popularity, the degree measure fails to capture the disparity of interaction between a node and its neighbors. We introduce in this paper a generalization of...
Source: http://arxiv.org/abs/0903.5025v3
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by Vincenzo Calò; Gianni Tallarita; Steven Thomas
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Starting from the action of two coincident non-BPS D9-branes, we investigate kink configurations of the U(2) matrix tachyon field. We consider both Str and Tr prescriptions for the trace over gauge indices of the non-BPS action. Non-abelian tachyon condensation in the theory with Tr prescription, and the resulting fluctuations about the kink profile, are shown to give rise to a theory of two coincident BPS D8-branes. This is a natural non-abelian generalization of Sen's mechanism of tachyon...
Source: http://arxiv.org/abs/0904.0601v2
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We compute the cotorsion product of the mod 2 cohomology of spinor group spin(n), which is the E_2-term of the Rothenberg-Steenrod spectral sequence for the mod 2 cohomology of the classifying space of the spinor group spin(n). As a consequence of this computation, we show the non-collapsing of the Rothenberg-Steenrod spectral sequence for n > 16.
Source: http://arxiv.org/abs/0904.0800v1
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by F. Bagarello
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We propose and discuss some toy models of stock markets using the same operatorial approach adopted in quantum mechanics. Our models are suggested by the discrete nature of the number of shares and of the cash which are exchanged in a real market, and by the existence of conserved quantities, like the total number of shares or some linear combination of cash and shares. The same framework as the one used in the description of a gas of interacting bosons is adopted.
Source: http://arxiv.org/abs/0904.0896v1
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by L. Fernández-Jambrina; L. M. González-Romero
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The possibility of obtaining an open set of regular cosmological models is discussed. Cylindrical stiff perfect fluid cosmologies are studied in detail. The condition for geodesic completeness is easy to check. A large family of non-singular models is found therein.
Source: http://arxiv.org/abs/0904.1497v1
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by Shuang Jia; Ni Ni; S. L. Bud'ko; P. C. Canfield
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Magnetization, resistivity and specific heat measurements were performed on single crystals of RFe$_2$Zn$_{20}$ and RCo$_2$Zn$_{20}$(R = Y, Nd, Sm, Gd - Lu). Whereas LuCo$_2$Zn$_{20}$ and YCo$_2$Zn$_{20}$ manifest unremarkable, metallic behavior, LuFe$_2$Zn$_{20}$ and YFe$_2$Zn$_{20}$ manifest behaviors characteristic of nearly ferromagnetic Fermi liquids. When the well defined $4f$ local moments (Gd$^{3+}$ - Tm$^{3+}$) were embedded into this strongly polarizable host, they all manifest...
Source: http://arxiv.org/abs/0904.1606v1
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by A. V. Khvalkovskiy; J. Grollier; A. Dussaux; K. A. Zvezdin; V. Cros
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We investigate the vortex excitations induced by a spin-polarized current in a magnetic nanopillar by means of micromagnetic simulations and analytical calculations. Damped motion, stationary vortex rotation and the switching of the vortex core are successively observed for increasing values of the current. We demonstrate that even for small amplitude of the vortex motion, the analytical description based the classical Thiele approach can yield quantitatively and qualitatively unsound results....
Source: http://arxiv.org/abs/0904.1751v1
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by C. J. Horowitz; Kai Kadau
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Mountains on rapidly rotating neutron stars efficiently radiate gravitational waves. The maximum possible size of these mountains depends on the breaking strain of neutron star crust. With multi-million ion molecular dynamics simulations of Coulomb solids representing the crust, we show that the breaking strain of pure single crystals is very large and that impurities, defects, and grain boundaries only modestly reduce the breaking strain to around 0.1. Due to the collective behavior of the...
Source: http://arxiv.org/abs/0904.1986v1
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by Laurent Chupin
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We study the existence and the uniqueness of a solution $\fy$ to the linear Fokker-Planck equation $-\Delta \fy + \div(\fy \F) = f$ in a bounded domain of $\R^d$ when $\F$ is a "confinement" vector field acting for instance like the inverse of the distance to the boundary. An illustration of the obtained results is given within the framework of fluid mechanics and polymer flows.
Source: http://arxiv.org/abs/0904.2645v1
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by Kim K. Nilsson; Klaus Meisenheimer; Nicholas Bond; Eric Gawiser; Harold Francke; Daniel Kunth; Toru Yamada; Goran Ostlin
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This publication contains the conference summary of the Understanding Lyman-alpha Emitters conference held at the Max Planck Institute for Astronomy in Heidelberg October 6 - 10, 2008. The scope of the conference was to bring together most of the scientists working in the field of Lyman-alpha emitters, whether at low or high redshift, or on observational or theoretical aspects, and to summarise how far the field of study of galaxies with Lyman-alpha emission has come. An outlook towards the...
Source: http://arxiv.org/abs/0904.3335v1
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In this manuscript we analyse the behaviour of the probability density function of the sum of $N$ deterministic variables generated from the triangle map of Casati-Prosen. For the case in which the map is both ergodic and mixing the resulting probability density function quickly concurs with the Normal distribution. When these properties are modified the resulting probability density functions are described by power-laws. Moreover, contrarily to what it would be expected, as the number of added...
Source: http://arxiv.org/abs/0802.0406v4
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by N. Bernal; A. Goudelis; Y. Mambrini; C. Munoz
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We study the possibility of identifying dark matter properties from XENON-like 100 kg experiments and the GLAST satellite mission. We show that whereas direct detection experiments will probe efficiently light WIMPs, given a positive detection (at the 10% level for $m_{\chi} \lesssim 50$ GeV), GLAST will be able to confirm and even increase the precision in the case of a NFW profile, for a WIMP-nucleon cross-section $\sigma_{\chi-p} \lesssim 10^{-8}$ pb. We also predict the rate of production...
Source: http://arxiv.org/abs/0804.1976v2
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For axisymmetric evolution of isolated systems, we prove that there exists a gauge such that the total mass can be written as a positive definite integral on the spacelike hypersurfaces of the foliation and the integral is constant along the evolution. The conserved mass integral controls the square of the extrinsic curvature and the square of first derivatives of the intrinsic metric. We also discuss applications of this result for the global existence problem in axial symmetry.
Source: http://arxiv.org/abs/0804.2679v3
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by Andreas Brandhuber; Massimiliano Vincon
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In this letter, we exploit generalised unitarity in order to calculate the cut-constructible part of one-loop amplitudes in non-supersymmetric Yang-Mills theory. In particular, we rederive the n-gluon MHV amplitudes for both the adjacent and non-adjacent gluon helicity configurations from 3- and 4-particle cuts alone.
Source: http://arxiv.org/abs/0805.3310v3
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by Travis Norsen; Joshua Lande; S. B. McKagan
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We discuss "the plane wave approximation" to quantum mechanical scattering using simple one-dimensional examples. The central points of the paper are that (a) plane waves should be thought of as infinitely wide wave packets, and (b) the calculations of reflection and transmission probabilities $R$ and $T$ in standard textbook presentations involve an approximation which is almost never discussed. We argue that it should be discussed explicitly, and that doing so provides a simple and...
Source: http://arxiv.org/abs/0808.3566v2
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by K Manouchehri; J. B. Wang
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Quantum random walks have received much interest due to their non-intuitive dynamics, which may hold the key to a new generation of quantum algorithms. What remains a major challenge is a physical realization that is experimentally viable and not limited to special connectivity criteria. We present a scheme for walking on arbitrarily complex graphs, which can be realized using a variety of quantum systems such as a BEC trapped inside an optical lattice. This scheme is particularly elegant since...
Source: http://arxiv.org/abs/0809.0034v3
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by Máximo Bañados; Pedro G. Ferreira; Constantinos Skordis
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It has been argued that a Universe governed by Eddington-Born-Infeld gravity can be compatible with current cosmological constraints. The extra fields introduced in this theory can behave both as dark matter and dark energy, unifying the dark sector in one coherent framework. We show the various roles the extra fields can play in the expansion of the Universe and study the evolution of linear perturbations in the various regimes. We find that, as a unified theory of the dark sector,...
Source: http://arxiv.org/abs/0811.1272v2
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by Wolfgang Hasse; Emrah Birsin; Philipp Haehnel
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Recently, Anderson et al. published an empirical prediction formula for the so far unexplained parts of the velocity changes of spacecrafts during Earth flybys. In the framework of a perturbational approach, we show that there is no velocity-independent force field of the Earth - in addition to its Newtonian gravity field - that is to reproduce this formula. However, we give examples for fields modeling exactly the flyby anomaly which are quadratic functions of the velocity of the spacecraft.
Source: http://arxiv.org/abs/0903.0109v1
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Recently Horava proposed a model for gravity which is described by the Einstein action in the infrared, but lacks the Lorentz invariance in the high-energy region where it experiences the anisotropic scaling. We test this proposal using two condensed matter examples of emergent gravity: acoustic gravity and gravity emerging in the fermionic systems with Fermi points. We suggest that quantum hydrodynamics, which together with the quantum gravity is the non-renormalizable theory, may exhibit the...
Source: http://arxiv.org/abs/0904.4113v3
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by Soumen Mondal; Ramakant S. Yadav; Mahendra Singh
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We present here the preliminary design of ARIES-Devasthal Faint Object Spectrograph and Camera (ADFOSC), which is a multi-mode instrument for both imaging and spectroscopy. ADFOSC is the first-generation instrument to be mounted at the axial port of the Cassegrain focus on our new 3.6m optical telescope to be installed at Devasthal, Nainital. The main design goals of the instrument are : the instrument will have capability of broad- and narrow-band imaging, low-medium resolution spectroscopy,...
Source: http://arxiv.org/abs/0905.0360v1
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by F. Ye; Songxue Chi; J. A. Fernandez-Baca; A. Moreo; E. Dagotto; J. W. Lynn; R. Mathieu; Y. Kaneko; Y. Tokura; Pengcheng Dai
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We use neutron scattering to investigate the doping evolution of the magnetic correlations in the single-layer manganite $\rm Pr_{\it 1-x}Ca_{\it 1+x}MnO_4$, away from the $x=0.5$ composition where the CE-type commensurate antiferromagnetic (AF) structure is stable. We find that short-range incommensurate spin correlations develop as the system is electron doped ($x
Source: http://arxiv.org/abs/0909.1944v1
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A representation of the sharp constant in a pointwise estimate of the gradient of a harmonic function in a multidimensional half-space is obtained under the assumption that function's boundary values belong to $L^p$. This representation is concretized for the cases $p=1, 2,$ and $\infty$.
Source: http://arxiv.org/abs/0909.1932v1
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by O. Cohen; J. J. Drake; V. L. Kashyap; S. H. Saar; I. V. Sokolov; W. B. Manchester IV; K. C. Hansen; T. I. Gombosi
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Since the first discovery of an extrasolar planetary system more than a decade ago, hundreds more have been discovered. Surprisingly, many of these systems harbor Jupiter-class gas giants located close to the central star, at distances of 0.1 AU or less. Observations of chromospheric 'hot spots' that rotate in phase with the planetary orbit, and elevated stellar X-ray luminosities,suggest that these close-in planets significantly affect the structure of the outer atmosphere of the star through...
Source: http://arxiv.org/abs/0909.3093v1
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by G. Eilam; B. Melic; J. Trampetic
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Within the Standard model with the 4th generation quarks b' and t' we have analyzed CP-violating flavor changing neutral current processes t -> cX; b'-> sX, b'-> bX,t'-> cX, and t'-> tX, with X=Z,H,gamma,g, by constructing and employing global, unique fit for the 4th generation mass mixing matrix CKM4 at 300 < m_t' < 700 GeV. All quantities appearing in the CKM4 were subject to our fitting procedure. We have found that our fit produces the following CP partial rate...
Source: http://arxiv.org/abs/0909.3227v2
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by J. Wrighton; J. W. Dufty; M. Bonitz; H. Kählert
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A theoretical description of shell structure for charged particles in a harmonic trap is explored at strong coupling conditions of $\Gamma$ = 50 and 100. The theory is based on an extension of the hypernetted chain approximation to confined systems plus a phenomenological representation of associated bridge functions. Predictions are compared to corresponding Monte Carlo simulations and quantitative agreement for the radial density profile is obtained.
Source: http://arxiv.org/abs/0910.0076v1
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by Hiranya V. Peiris; Licia Verde
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We present a minimally-parametric reconstruction of the primordial power spectrum using the most recent cosmic microwave background and large scale structure data sets. Our goal is to constrain the shape of the power spectrum while simultaneously avoiding strong theoretical priors and over-fitting of the data. We find no evidence for any departure from a power law spectral index. We also find that an exact scale-invariant power spectrum is disfavored by the data, but this conclusion is weaker...
Source: http://arxiv.org/abs/0912.0268v1
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by M. C. Parisi; D. Geisler; A. J. Grocholski; J. J. Claria; A. Sarajedini
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We have obtained metallicities of ~ 360 red giant stars distributed in 15 Small Magellanic Cloud (SMC) fields from near-infrared spectra covering the CaII triplet lines using the VLT + FORS2. The errors of the derived [Fe/H] values range from 0.09 to 0.35 dex per star, with a mean of 0.17 dex. The metallicity distribution of the whole sample shows a mean value of [Fe/H] = -1.00 +- 0.02, with a dispersion of 0.32 +- 0.01, in agreement with global mean [Fe/H] values found in previous studies. We...
Source: http://arxiv.org/abs/0912.0682v1
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by M. Pica Ciamarra; R. Pastore; M. Nicodemi; A. Coniglio
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The non-equilibrium transition from a fluid-like state to a disordered solid-like state, known as the jamming transition, occurs in a wide variety of physical systems, such as colloidal suspensions and molecular fluids, when the temperature is lowered or the density increased. Shear stress, as temperature, favors the fluid-like state, and must be also considered to define the system 'jamming phase diagram' [1-4]. Frictionless athermal systems [1], for instance, can be described by the zero...
Source: http://arxiv.org/abs/0912.3140v1
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by Robert Berman; Jean-Pierre Demailly
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The goal of this work is to prove the regularity of certain quasi-plurisubharmonic upper envelopes. Such envelopes appear in a natural way in the construction of hermitian metrics with minimal singularities on a big line bundle over a compact complex manifold. We prove that the complex Hessian forms of these envelopes are locally bounded outside an analytic set of singularities. It is furthermore shown that a parametrized version of this result yields a priori inequalities for the solution of...
Source: http://arxiv.org/abs/0905.1246v1
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by César A. Rodríguez-Rosario; James D. Whitfield; Alán Aspuru-Guzik
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We introduce the quantum stochastic walk (QSW), which determines the evolution of generalized quantum mechanical walk on a graph that obeys a quantum stochastic equation of motion. Using an axiomatic approach, we specify the rules for all possible quantum, classical and quantum-stochastic transitions from a vertex as defined by its connectivity. We show how the family of possible QSWs encompasses both the classical random walk (CRW) and the quantum walk (QW) as special cases, but also includes...
Source: http://arxiv.org/abs/0905.2942v2
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by L. Keek; N. Langer; J. J. M. in 't Zand
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Hydrogen and/or helium accreted by a neutron star from a binary companion may undergo thermonuclear fusion. At different mass accretion rates different burning regimes are discerned. Theoretical models predict helium fusion to proceed as a thermonuclear runaway for accretion rates below the Eddington limit and as stable burning above this limit. Observations, however, place the boundary close to 10% of the Eddington limit. We study the effect of rotationally induced transport processes on the...
Source: http://arxiv.org/abs/0905.4477v1
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by H. P. Morsch
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Based on a Lagrangian with a coupling of two gluons to J^pi=0^+ (the quantum numbers of the vacuum) which decay to q-qbar pairs, a model is presented, in which hadrons couple directly to the absolute vacuum of fluctuating gluon fields. By self-consistency requirements the confinement potential as well as hadron densities and masses are obtained, which are in good agreement with experimental data on scalar and vector mesons. In comparison with potential models additional states are predicted,...
Source: http://arxiv.org/abs/0906.1742v3