bluuebunny/crossref_metadata_2025 huggingface dataset:
A Theoretical Structure Study Infrared Spectra of C60O Isomers Through Ab Initio Method
Authors: Nizam Rashid , Rizvi S. Mahdi A. , Azam Ameer
Published: February 2011

The infrared spectra of C60O isomers have been calculated through ab initio method. It has been observed that the simulated spectrum of one of C60O isomers is matching with the available experimental data in literature, while the other isomers are not matching so much. One can easily understand the basic physical properties of C60O by knowing of their vibration and geometric structures with their interrelation between these properties. It is found that the isomeric structures of C60O are very sensitive to electron correlation treatment with basis set that are employed. So the structure of C60O will not calculate from semi-empirical methods such as modified neglect of differential overlap (MNDO) or AM1 for more accuracy. The simulated spectra show different bands that rarely found all bands simultaneously in single experiment.
Effect of Pressure-Dependency of the Yield Criterion on the Development of Plastic Zones and the Distribution of Residual Stresses in Thin Annular Disks
Authors: Alexandrov Sergei , Jeng Yeau-Ren , Lomakin Evgenii
Published: February 2011

The main objective of the present paper is to show an effect of pressure-dependency of the yield criterion on the development of the plastic zone and the distribution of residual stresses in a thin annular disk subject to a pressure over its inner edge during the loading stage. The Drucker–Prager yield criterion is adopted to account for the effect of the hydrostatic pressure on plastic yielding. The state of stress is supposed to be plane and the material model is perfectly plastic. A semi-analytical stress solution to the problem formulated is given and its qualitative features are emphasized. It is shown that the pressure at which plastic yielding starts and the pressure at which the entire disk becomes plastic are weakly affected by the pressure-dependency of the yield criterion. On the other hand, this dependency has a significant effect on the maximum possible pressure that can be supported by the disk. The minimum pressure at which reverse yielding occurs is also affected by the pressure-dependency of the yield criterion. In general, the residual radial stress distribution is more influenced by the pressure-dependency of the yield criterion than the residual circumferential stress distribution, although the magnitude of circumferential stresses is larger than the magnitude of radial stresses. On the other hand, the effect of pressure-dependency of the yield criterion on the residual circumferential stress distribution is pronounced in the vicinity of the inner edge of the disk, where this stress is important for improving fatigue performance of structures.
Finite Element Modeling of Beams With Surface Energy Effects
Authors: Liu C. , Rajapakse R. K. N. D. , Phani A. S.
Published: February 2011

A finite element formulation of a nonclassical beam theory based on the Gurtin–Murdoch model for continua with deformable elastic surfaces is presented. The governing equations for thin and thick beams are used together with a weighted residual formulation to explicitly obtain the beam stiffness and mass matrices. Numerical solutions for selected test cases are compared with the analytical results available in literature for beam static deflections, natural frequencies, and buckling loads. The modified bending stiffness corresponding to the present model agrees closely with a recently reported rigorous solution. The maximum influence of surface energy effects is observed for cantilever beams. The finite element scheme provides an efficient tool to analyze, design, and predict the mechanical response of beam elements encountered in nanoelectromechanical systems and other nanoscale devices.
Analytical Approach to Ballistic Dispersion of Projectile Weapons Based on Variant Launch Velocity
Authors: Chen Michael M.
Published: February 2011

This study quantifies the contribution of variant projectile velocity at a gun muzzle to its dispersion at an aim point from an analytical approach. The dispersion was formulated on the basis of stochastic physical conditions including potential crosswind effect. As a result, the statistical quantities of projectile impact distribution could be obtained from the stochastic formulation. In addition, this research proposes correction factors that may be needed when comparing dispersion in angular mil at multiple downrange distances. The significance of the correction factors was demonstrated through a few application examples.
Ultrasonic Vibration-Assisted Pelleting of Cellulosic Biomass for Biofuel Manufacturing
Authors: Zhang P. F. , Pei Z. J. , Wang D. H. , Wu X. R. , Cong W. L. , Zhang M. , Deines Timothy
Published: February 2011

Increasing demands and concerns for the reliable supply of liquid transportation fuels makes it important to find alternative sources to petroleum based fuels. One such alternative is cellulosic biofuels. However, several technical barriers have hindered large-scale, cost-effective manufacturing of cellulosic biofuels, such as the low density of cellulosic feedstocks (causing high transportation and storage costs) and the lack of efficient pretreatment procedures for cellulosic biomass. This paper reports experimental investigations on ultrasonic vibration-assisted (UV-A) pelleting of cellulosic feedstocks. It studies effects of input variables (ultrasonic vibration, moisture content, and particle size) on output variables (pellet density, stability, durability, pelleting force, and yield of biofuel conversion) in UV-A pelleting. Results showed that UV-A pelleting could increase the density of cellulosic feedstocks and the yield of biofuel conversion.
e-Nanoflex Sensor System: Smartphone-Based Roaming Health Monitor
Authors: Varadan Vijay K. , Kumar Prashanth S. , Oh Sechang , Kwon Hyeokjun , Rai Pratyush , Banerjee Nilanjan , Harbaugh Robert E.
Published: February 2011

The growing need and market demand for point of care (POC) systems to improve patient’s quality of life are driving the development of wireless nanotechnology based smart systems for diagnosis and treatment of various chronic and life threatening diseases. POC diagnostics for neurological, metabolic, and cardiovascular disorders require constant long term untethered monitoring of individuals. Given the uncertainty associated with location and time at which immediate diagnosis and treatment may be required, constant vigilance and monitoring are the only practical solutions. What is needed is for a remote cyber-enabled health care smart system incorporating novel ideas from nanotechnology, low power embedded systems, wireless networking, and cloud computing to fundamentally advance. To meet this goal, we present e-Nanoflex platform, which is capable of monitoring patient health wherever they may be and communicating the data in real time to a physician or a hospital. Unlike state-of-the-art systems that are either local sensor systems or rely on custom relaying devices, e-Nanoflex is a highly nonintrusive and inexpensive end-to-end cyber-physical system. Using nanostructured sensors, e-Nanoflex provides nearly invisible monitoring of physiological conditions. It relies on smartphones to filter, compress, and relay geo-tagged data. Further, it ties to a backend cloud infrastructure for data storage, data dissemination, and abnormality detection using machine learning techniques. e-Nanoflex is a complete end-to-end system for physiological sensing and geo-tagged data dissemination to hospitals and caregivers. It is intended as a basic platform that can support any nanostructure based flexible sensor to monitor a variety of conditions such as body temperature, respiration air flow, oxygen consumption, bioelectric signals, pulse oximetry, muscle activity, and neural activity. Additionally, to address the cost of manufacturing sensors, e-Nanoflex uses a low cost production technique based on roll to roll gravure printing. We show the efficacy of our platform through a case study that involves acquiring electrocardiogram signals using gold nano-electrodes fabricated on a flexible substrate.
Silicon nanostructure solar cells with excellent photon harvesting
Authors: Chen Chen , Jia Rui , Yue Huihui , Li Haofeng , Liu Xinyu , Ye Tianchun , Kasai Seiya , Tamotsu Hashizume , Wu Nanjian , Wang Shanli , Chu Junhao , Xu Bingshe
Published: February 2011

Silicon (Si) nanostructure solar cells have been synthesized using a nanowire (NW) array as the surface texturing. Optical-reflection measurement exhibits an excellent photon-harvesting property for the Si-NW-array texturization. Less than 2% reflection ratio at an 800 nm wavelength was achieved. Results show that an optimized 125×125 mm2 Si nanostructure solar cell with an excellent photon-harvesting property has a 35.4% higher energy-conversion efficiency than the c-Si solar cell due to its enhanced optical-absorption characteristics. However, for the nanostructured solar cells, the decrease in external quantum efficiencies in the short-wavelength region proves that the surface recombination plays a critical role in determining the final quantum-efficiency performance, indicating that optimum surface passivation was a prerequisite in high-efficiency Si nanostructure solar cells.
Ripple formation on atomically flat cleaved Si surface with roughness of 0.038 nm rms by low-energy Ar1+ ion bombardment
Authors: Pahlovy Shahjada A. , Mahmud S. F. , Yanagimoto K. , Miyamoto I.
Published: February 2011

The authors have conducted research regarding ripple formation on an atomically flat cleaved Si surface by low-energy Ar+ ion bombardment. The cleaved atomically flat and smooth plane of a Si wafer was obtained by cutting vertically against the orientation of a Si (100) wafer. Next, the cleaved surface was sputtered by a 1 keV Ar+ ion beam at ion-incidence angles of 0°, 60°, 70°, and 80°. The results confirm the successful ripple formation at ion-incidence angles of 60°–80° and that the wavelength of the ripples increases with the increase of the ion-incidence angle, as well as the inverse of ion doses. The direction of the ripple also changes from perpendicular to parallel to the projection of the ion-beam direction along the surface with the increasing ion-incidence angle. The authors have also observed the dose effects on surface roughness of cleaved Si surface at the ion-incidence angle of 60°, where the surface roughness increases with the increased ion dose. Finally, to understand the roughening mechanism, the authors studied the scaling behavior, measured the roughness exponent α, and compared the evolution of scaling regimes with Cuerno’s one-dimensional simulation results.
Integrating Multiple Types of Data for Signaling Research: Challenges and Opportunities
Authors: Wiley H. Steven
Published: February 2011

Easy integration of biological data has enormous potential to drive advances in biology and medicine.
Effective Representation and Storage of Mass Spectrometry–Based Proteomic Data Sets for the Scientific Community
Authors: Olsen Jesper V. , Mann Matthias
Published: February 2011

Proteomics data need a reliability tag to allow scientists to discriminate among data sets in public repositories.
Setting the Standards for Signal Transduction Research
Authors: Saez-Rodriguez Julio , Alexopoulos Leonidas G. , Stolovitzky Gustavo
Published: February 2011

Standardized methods to link large, complex data sets to models are needed.
Notch for Neuronal Activity
Authors: Wong Wei
Published: February 2011

Notch signaling occurs in
Drosophila
olfactory receptor neurons and promotes synaptic plasticity in mouse hippocampal neurons.
Stress Builds Bone
Authors: Gough Nancy R.
Published: February 2011

Without an intact ER stress pathway, osteoblasts fail to properly differentiate, resulting in skeletal dysplasia.
More or Less Durable
Authors: Hurtley Stella M.
Published: February 2011

In times of stress, long-lived proteins increase their durability.
Parasites Ad Infinitum
Authors: Ash Caroline
Published: February 2011

An RNA virus of a parasite binds to human Toll-like receptor 3 and modulates host immune responses to the parasite.
Deadly Switch
Authors: Hurtley Stella M.
Published: February 2011

Regulated deaggregation allows meningitis-causing bacteria to propagate to new host cells and migrate across epithelia.
The Effect of Treatment Expectation on Drug Efficacy: Imaging the Analgesic Benefit of the Opioid Remifentanil
Authors: Bingel Ulrike , Wanigasekera Vishvarani , Wiech Katja , Ni Mhuircheartaigh Roisin , Lee Michael C. , Ploner Markus , Tracey Irene
Published: February 2011

An individual’s expectation that a pain treatment will or will not work can alter both its subjective effectiveness and the pain-related activity in the brain.
Comment on “Multidimensional Results Reporting to Participants in Genomic Studies: Getting It Right”
Authors: Bookman Ebony B. , Langehorne Aleisha A. , Eckfeldt John H. , Glass Kathleen C. , Jarvik Gail P. , Klag Michael , Koski Greg , Motulsky Arno , Wilfond Benjamin , Manolio Teri A. , Fabsitz Richard R. , Luepker Russell V.
Published: February 2011

The Commentary by Kohane and Taylor published on 23 June 2010, mistakenly indicates that the NHLBI Working Group advocated that researchers keep genetic information from research subjects if an intervention is not available for the disease.
Growth Hormone Receptor Deficiency Is Associated with a Major Reduction in Pro-Aging Signaling, Cancer, and Diabetes in Humans
Authors: Guevara-Aguirre Jaime , Balasubramanian Priya , Guevara-Aguirre Marco , Wei Min , Madia Federica , Cheng Chia-Wei , Hwang David , Martin-Montalvo Alejandro , Saavedra Jannette , Ingles Sue , de Cabo Rafael , Cohen Pinchas , Longo Valter D.
Published: February 2011

Ecuadorians who have a genetic mutation in the growth hormone receptor almost never die of cancer or diabetes complications, possibly because of high resistance to oxidative damage and low circulating insulin.
Opportunity and Means: Horizontal Gene Transfer from the Human Host to a Bacterial Pathogen
Authors: Anderson Mark T. , Seifert H. Steven
Published: February 2011

The acquisition and incorporation of genetic material between nonmating species, or horizontal gene transfer (HGT), has been frequently described for phylogenetically related organisms, but far less evidence exists for HGT between highly divergent organisms. Here we report the identification and characterization of a horizontally transferred fragment of the human long interspersed nuclear element L1 to the genome of the strictly human pathogen
Neisseria gonorrhoeae
. A 685-bp sequence exhibiting 98 to 100% identity to copies of the human L1 element was identified adjacent to the
irg4
gene in some
N. gonorrhoeae
genomes. The L1 fragment was observed in ~11% of the
N. gonorrhoeae
population sampled but was not detected in
Neisseria meningitidis
or commensal
Neisseria
isolates. In addition,
N. gonorrhoeae
transcripts containing the L1 sequence were detected by reverse transcription-PCR, indicating that an L1-derived gene product may be produced. The high degree of identity between human and gonococcal L1 sequences, together with the absence of L1 sequences from related
Neisseria
species, indicates that this HGT event occurred relatively recently in evolutionary history. The identification of L1 sequences in
N. gonorrhoeae
demonstrates that HGT can occur between a mammalian host and a resident bacterium, which has important implications for the coevolution of both humans and their associated microorganisms.

IMPORTANCE
The interactions between microbes and their hosts are relevant to several aspects of biology, including evolution, development, immunity, and disease.
Neisseria gonorrhoeae
serves as a particularly informative model for this interaction because it has exclusively coevolved with humans and is not known to be found in any other environment. In addition, investigation of the evolutionary relationship between
N. gonorrhoeae
and humans has practical implications, since gonorrhea is a prevalent sexually transmitted infection worldwide. This study was undertaken to characterize the horizontal transfer of genetic information from humans to
N. gonorrhoeae
, an event that has been scarcely recognized between any mammalian host and bacterial pathogen. Here we provide evidence that this genetic exchange was the result of a recent evolutionary event that has been propagated within the gonococcal population.
Enhanced Mucosal Immune Responses to HIV Virus-Like Particles Containing a Membrane-Anchored Adjuvant
Authors: Vassilieva Elena V. , Wang Bao-Zhong , Vzorov Andrei N. , Wang Li , Wang Ying-Chun , Bozja Jadranka , Xu Rui , Compans Richard W.
Published: February 2011

Previously, a modified HIV Env protein with a heterologous membrane anchor was found to be incorporated into HIV virus-like particles (VLPs) at 10-fold-higher levels than those of unmodified Env. To further improve the immunogenicity of such VLPs, membrane-anchored forms of bacterial flagellin (FliC) or a flagellin with a truncated variable region (tFliC) were constructed to be incorporated into the VLPs as adjuvants. HIV-specific immune responses induced by the resulting VLPs were determined in a guinea pig model. The VLPs induce enhanced systemic antibody responses by either systemic or mucosal vaccination and enhanced mucosal immunity by a mucosal immunization route, as demonstrated by high levels of HIV-specific serum IgG and mucosal IgG and IgA. The quality of the antibody responses was also improved, as shown by enhanced neutralization capacity. VLPs incorporating FliC were more effective in inducing systemic responses, while VLPs containing tFliC were more effective in inducing mucosal IgA responses. The IgG titers in sera were found to last for at least 5 months without a significant drop. These results indicate that HIV VLPs incorporating high levels of Env and a molecular adjuvant have excellent potential for further development as a prophylactic HIV vaccine.

IMPORTANCE
A prophylactic vaccine is urgently needed to control the spread of HIV/AIDS. Antigens inducing strong systemic and mucosal immune responses are promising as vaccines for this mucosally transmitted disease. We found that novel HIV virus-like particles (VLPs) presenting a high level of Env in its native membrane-bound form and coincorporating an innate immune-signaling adjuvant in the same particles were effective in inducing enhanced systemic and mucosal immunity. As new HIV vaccine candidates, these VLPs bridge the gaps of the innate and adaptive, as well as systemic and mucosal, immune responses, providing a new approach for HIV vaccine development.
Streptolysin O Inhibits Clathrin-Dependent Internalization of Group A
Streptococcus
Authors: Logsdon Lauren K. , Håkansson Anders P. , Cortés Guadalupe , Wessels Michael R.
Published: February 2011

Group A
Streptococcus
(GAS) can be internalized by epithelial cells, including keratinocytes from human skin or pharyngeal epithelium. Internalization of GAS by epithelial cells has been postulated both to play a role in host defense and to provide a sanctuary site for GAS survival. The cholesterol-binding cytolysin streptolysin O (SLO) appears to enhance virulence in part by inhibiting GAS internalization by human keratinocytes and by disrupting the lysosomal degradation of internalized GAS. We now report that low-level production of SLO by an inducible expression system reduced GAS internalization by keratinocytes. Induced SLO expression also prevented lysosomal colocalization with intracellular bacteria and acidification of GAS-containing vacuoles. Exogenous recombinant SLO mimicked the inhibitory effect of SLO secretion on GAS entry but not that on colocalization with the lysosomal marker LAMP-1, implying that disruption of lysosomal degradation requires intracellular secretion of SLO. The internalization of SLO-negative GAS was blocked by the depletion of host cell cholesterol and by the inhibition or knocking down of the expression of clathrin or dynamin. SLO also inhibited the cellular uptake of other cargos that are internalized by clathrin-mediated uptake or by macropinocytosis. We conclude that SLO interferes with the internalization of GAS through local perturbation of the keratinocyte cell membrane and disruption of a clathrin-dependent uptake pathway.

IMPORTANCE
Streptolysin O (SLO) is a member of a family of pore-forming toxins, the cholesterol-dependent cytolysins, that are produced by many Gram-positive bacterial pathogens. While SLO can lyse host cells at high doses, much smaller amounts appear to contribute to pathogenesis by inhibiting the internalization of group A
Streptococcus
(GAS) by pharyngeal keratinocytes and by preventing efficient intracellular killing by lysosomal fusion. This study provides evidence that SLO blocks a clathrin-dependent pathway for the internalization of GAS through effects on the cell surface, whereas inhibition of lysosomal fusion depends on the intracellular production of SLO. These observations may have broader implications for understanding the pathogenesis of multiple bacterial species that produce cholesterol-dependent cytolysins.
NEW TYPE SHIFT OPERATORS FOR THREE-DIMENSIONAL INFINITE WELL POTENTIAL
Authors: SUN GUO-HUA , DONG SHI-HAI
Published: February 2011

New type shift operators for three-dimensional infinite well potential are identified to connect those quantum systems with different radials R but with the same energy spectrum. It should be pointed out that these shift operators depend on all variables contained in wave functions. Thus they establish a novel relation between wave functions ψlm(r) and ψ(l±1)(m±1)(r).
EFFECTS OF IN-MEDIUM MODIFICATION OF WEAKLY INTERACTING LIGHT BOSON MASS IN NEUTRON STARS
Authors: SULAKSONO A. , MARLIANA  , KASMUDIN
Published: February 2011

The effects of the presence of weakly interacting light boson (WILB) in neutron star matter have been revisited. Direct checking based on the experimental range of symmetric nuclear matter binding energy1 and the fact that the presence of this boson should give no observed effect on the crust properties of neutron star matter, shows that the characteristic scale of WILB [Formula: see text] should be ≤2 GeV-2. The recent observational data with significant low neutron stars radii2 and the recent largest pulsar which has been precisely measured, i.e. J1903+0327 (Ref. 3) indicate that in-medium modification of WILB mass in neutron stars cannot be neglected.
"REDISCOVERING" THE STANDARD MODEL AT CMS
Authors:   for the CMS Collaboration, GREEN DAN
Published: February 2011

The Large Hadron Collider (LHC) began 7 TeV C.M. energy operation in April, 2010. The CMS experiment immediately analyzed the earliest data taken in order to "rediscover" the Standard Model (SM) of high energy physics. By the late summer, all SM particles were observed and CMS began to search for physics beyond the SM and beyond the present limits set at the Fermilab Tevatron. The first LHC run ended in Dec., 2010 with a total integrated luminosity of about 45 pb-1 delivered to the experiments.
DETECTION OF AMPLITUDE-SQUARED SQUEEZING VIA HOMODYNE METHOD
Authors: PRAKASH HARI , KUMAR PANKAJ , MISHRA DEVENDRA KUMAR
Published: February 2011

We report an ordinary homodyne method for detection of amplitude-squared squeezing in any state by measuring the higher-order moments of the number operator in light obtained by homodyning with intense coherent light.
FABRICATION AND CHARACTERISTICS OF SILICON MICRO-TIP ARRAYS
Authors: CHEN KUAN-JEN , FANG TE-HUA , JI LIANG-WEN , CHANG SHOOU-JINN , YOUNG SHENG-JOUE
Published: February 2011

Si field emission arrays (FEAs) were produced using simple optical lithography and plasma dry etching. By optimizing plasma etching conditions, we achieved uniform ultra-sharp emitters with 50 nm radius, 3.6 μm height, 60° cone angle, and 1.38×106 tips/cm 2 packing density. For the fabricated FEAs, it was found that turn-on voltage was 850 V and the field emission current was 24 μA at 1100 V. It was also found that field enhancement factor γ of the fabricated Si FEAs was approximately 58. Nanomechanical characterization of Si necked tips array was performed by nanoindentation technology. The critical buckling load and critical stress of the Si necked tips array were 570 μN and 1.192 GPa, respectively.
THEORETICAL INVESTIGATION OF SYNCHRONOUS TOTALLY ASYMMETRIC EXCLUSION PROCESSES ON LATTICES WITH A SHORTCUT
Authors: XIAO SONG , CAI JIU-JU , LIU FEI , LIU MINGZHE
Published: February 2011

In this paper, a synchronous totally asymmetric simple exclusion process (TASEP) with a shortcut under open boundary conditions is investigated. The shortcut is located in the bulk and characterized by shortcut probability q. The phase diagram and density profiles of the model are obtained. It is found that the phase diagram of the model includes three regions, similar to the normal synchronous TASEP. Interestingly, the phase diagram does not change with q. Monte Carlo simulations are used to obtain the bulk density of different phases and they are in good agreement with the approximate stationary state solutions of the model.
UNIFORMITY AND SPATIAL CHAOS OF SPATIAL PHYSICS KINEMATIC SYSTEM
Authors: LIU SHUTANG , SUN FUYAN , SUN JIE
Published: February 2011

This article summarizes the uniformity law of spatial physics kinematic systems, and studies the chaos and bifurcation behavior of the uniform system in space. In particular, it also fully explains the relation among the uniform system, the coupled map lattice model which has attracted considerable interest currently, and one-dimensional nonlinear dynamical systems.
ANTI-RESONANCES IN A NORMAL METAL/SUPERCONDUCTOR JUNCTION WITH A SIDE-COUPLED QUANTUM DOT
Authors: WU ZHENG-YI , FENG JIN-FU
Published: February 2011

Using the equivalent single-particle multi-channel network and the Landauer formula, we theoretically study anti-resonances in conductance of a normal metal–superconductor junction with a side-coupled quantum dot. The transport properties depend on the interplay between the Coulomb blockade effect and the Andreev reflection. It is found that the calculated dependence of the conductance on the gate voltage of dot exhibits two anti-resonant conductance dips. This behavior is caused by the destructive interference of the wave directly transmitted through the normal metal–superconductor junction and the wave reflected from the dot. Moreover, we find that the shape of two anti-resonance profile is symmetric, due to the Andreev reflection, depending on the strength of coupling between the quantum dot and normal metal.
OVERVIEW OF STRANGENESS NUCLEAR PHYSICS
Authors: Gal Avraham
Published: February 2011

Selected topics in Strangeness Nuclear Physics are reviewed: Λ-hypernuclear spectroscopy and structure, multistrangeness, and [Formula: see text] mesons in nuclei.
PHOTOPRODUCTION OF THE Σ*- RESONANCE FROM THE NEUTRON
Authors: Hicks K. H. , Keller D.
Published: February 2011

Data for the reaction [Formula: see text] was measured at the LEPS detector using a linearly polarized photon beam produced by laser-backscattering at the SPring-8 facility. The cross sections are in good agreement with predictions from a theoretical model by Oh, Ko and Nakayama. This model, which uses SU (3) flavor symmetry, suggests that the coupling constants for strange-particle production in the baryon decuplet can be predicted with reasonable accuracy using this symmetry.
PHOTO- AND ELECTROPRODUCTION OF KAONS
Authors: Bydžovský P.
Published: February 2011

Isobar models for the electromagnetic production of K + and K 0 are discussed with emphasis on the K 0 photoproduction off neutron. Predictions of the models for the K 0 photoproduction on deuteron are compared with the recent data and some properties of the elementary amplitudes are shown.
NIJMEGEN BARYON-BARYON INTERACTIONS FOR S = -1, -2 SYSTEMS
Authors: Rijken Th. A. , Nagels M. M. , Yamamoto Y.
Published: February 2011

We present and discuss the most recent version of the extended-soft-core (ESC) interactions. The ESC-model describes the nucleon-nucleon ( NN ), hyperon-nucleon ( YN ), and hyperon-hyperon ( YY ), in terms of meson-exchanges using (broken) SUF(3)-symmetry. In this approach to baryon-baryon ( BB ) the dynamics is derived from (i) one-boson-exchanges (OBE), (ii) two-meson-exchanges (TME), and (iii) meson-pair-exchanges (MPE), (iv) gluon-exchanges, and (v) quark-core effects. In the OBE-sector, a special feature is the importance of the axial-vector meson potentials, and the inclusion of a zero in the scalar- and axial- meson form-factors. Novelties are the inclusion of (a) odderon-exchange, and (b) special pronounced effects of the appearance of forbidden six-quark configurations. With these ingredients, a rather flexible dynamical framework is constructed. Namely, it appeared feasible to keep the parameters of the model in reasonable accordance with the predictions of the 3P0 quark-pair-creation model (QPC). This is the case for the meson- and meson-pair-baryon coupling constants and the F/(F + D)-ratio's as well. The NN , YN , and YY results for this model are rather promising. In particular, we improved the ΛN spin-orbit interaction greatly by the inclusion of (a) the Brown, Downs, and Iddings anti-symmetric spin-orbit potentials, and (b) new corrections to the MPE-potentials. Also, the special quark-core effects provide ample repulsion in the Σ+p(3S1,T = 3/2)- and ΣN(1S0,T = 1/2)-channels. The new version of the ESC-model reported here will be referred to as ESC07 henceforth.
EXTRACTION OF ΛΛ SCATTERING LENGTH
Authors:   For the KEK-PS E522 Collaboration, Yoon C. J. , Akikawa H. , Aoki K. , Fukao Y. , Funahashi H. , Hayata M. , Imai K. , Miwa K. , Okada H. , Saito N. , Sato H. D. , Shoji K. , Takahashi H. , Taketani K. , Asai J. , Kurosawa M. , Ieiri M. , Hayakawa T. , Kishimoto T. , Sato A. , Shimizu Y. , Yamamoto K. , Yoshida T. , Hibi T. , Nakazawa K. , Ahn J. K. , Choi B. H. , Kim S. J. , Kim S. H. , Park B. D. , Park I. G. , Song J. S. , Yoon C. S. , Tanida K. , Ohnishi A.
Published: February 2011

We determine ΛΛ scattering parameters from a ΛΛ invariant mass spectrum that was obtained by 12 C (K-, K+ΛΛ) reaction at the KEK Proton Synchrotron. In the framework of Watson's procedure, the obtained scattering length [Formula: see text] and effective range [Formula: see text] are most consistent with the values predicted by using the Nijmegen soft core models (NSC97's). However, the predicted values by using the Nijmegen hard-core ND ( G -matrix) and the extended soft-core (ESC00) models are out of two standard deviations from the determined scattering parameters.
STRUCTURE OF X(3872) WITH COUPLING TO MULTI-HADRONIC STATES
Authors: Takizawa M. , Takeuchi S.
Published: February 2011

In order to understand the structure of the X (3872), we have studied the effects of the [Formula: see text] core state coupling to the multi-hadronic states such as [Formula: see text], ρ J/ψ etc. We have calculated the transition strength S(E) using the Green's function approach with the simple solvable interactions. We have also studied the S(E) in the case of no [Formula: see text] core state, namely, the [Formula: see text] molecule. Since the calculated shapes of the transition strengths are different from each other, we shall be able to determine the degree of the mixing of the [Formula: see text] state in the X (3872) from the shape of the energy spectrum.
LIGHT Ξ HYPERNUCLEI IN FOUR-BODY CLUSTER MODELS
Authors: Hiyama E.
Published: February 2011

Detailed structure calculations in [Formula: see text], [Formula: see text] and [Formula: see text] are performed within the framework of the microscopic of four-body cluster models. We adopted effective ΞN interactions derived from the Nijmegen interaction models, which give rise to substantially attractive Ξ-nucleus potentials in accordance with the experimental indications. [Formula: see text] and [Formula: see text] are predicted to have bound states. We propose to observe the bound states in future (K-,K+) experiments using 7 Li and 10 B targets in addition to the standard 12 C target. The experimental confirmation of these states will provide information on the spin- and isospin-averaged ΞN interaction.
TENSOR OPTIMIZED SHELL MODEL AND HYPERNUCLEI
Authors: Toki Hiroshi , Myo Teruaki , Ikeda Kiyomi
Published: February 2011

The pion plays an important role for the structure of nucleus and nuclear matter. We propose a new theoretical framework, named the tensor optimized shell model (TOSM) to calculate the tensor interaction together with the unitary correlation operator method (UCOM) for the short range repulsion. We are able to handle the pion exchange interaction directly in the proposed framework. We compare the calculated results for 4 He with the rigorous calculation to show the power of TOSM to treat the tensor interaction. We then discuss the important role of pion in hypernuclei due to excitation of Σ baryon from Λ state.
DEFORMATION AND WEAK DECAY OF Λ HYPERNUCLEI
Authors: Hagino K. , Win Myaing Thi , Nakagawa Y.
Published: February 2011

We use the self-consistent mean-field theory to discuss the ground state and decay properties of Λ hypernuclei. We first discuss the deformation of Λ hypernuclei using the relativistic mean-field (RMF) approach. We show that, although most of the hypernuclei have a similar deformation parameter to the core nucleus, the shape of 28 Si is drastically altered, from oblately deformed to spherical, if a Λ particle is added to this nucleus. We then discuss the pionic weak decay of neutron-rich Λ hypernuclei using the Skyrme Hartree-Fock + BCS method. We show that, for a given isotope chain, the decay rate increases as a function of mass number, due to the strong neutron-proton interaction.
RECENT PROGRESSES IN THE STUDY OF NONMESONIC WEAK DECAY OF Λ HYPERNUCLEI
Authors: Bhang H. , Ajimura S. , Aoki K. , Banu A. , Fukuda T. , Hashimoto O. , Hwang J. I. , Kameoka S. , Kang B. H. , Kim E. , Kim J. H. , Kim M. , Maruta T. , Miura Y. , Miyake Y. , Nagae T. , Nakamura M. , Nakamura S. N. , Noumi H. , Okada S. , Okayasu Y. , Outa H. , Park H. , Saha P. K. , Sato Y. , Sekimoto M. , Shin S. , Takahashi T. , Tamura H. , Tanida K. , Toyota A. , Tsukata K. , Watanabe T. , Yim H. J.
Published: February 2011

Fundamental interest on Non Mesonic Weak Decay (NMWD) is that it provides practically the only means to study the elementary ΔS = 1 baryon-baryon weak interaction process, Λ N → NN (Λ p → np and Λ n → nn ), since it is difficult to be realized in the free space. Thanks to the recent developments in experimental and theoretical studies, the relative strength of two channels, the Γn/Γp ratios whose experimental and theoretical values have showed a long standing discrepancy have been converged to ~ 0.5 and the discrepancy problem finally has been solved.1–3 However, despite the progresses, the decay interaction of NMWD is not yet well established and there remain the important issues such as the discrepancy of asymmetry parameter between experimental and theoretical values, confirmation of 3-body NMWD process, and whether the I = 1/2 rule for ΔS = 1 decay would hold or not in NMWD. Especially the recent experimental indication of the 3-body decay process Λ NN → NNN whose contribution was predicted to be significant in the theoretical calculations seems to be strong and showed a surprisingly large contribution in the quenching of singles and coincidence nucleon yields in NMWD. Recent results of the asymmetry parameter αnm of NMWD showed small values for both s -shell [Formula: see text] and p -shell [Formula: see text] and consistent with each other. However, the discrepancy of the theoretical values from those of experimental ones remains to be understood. It now becomes one of the urgent issues in NMWD study to determine the contribution of the 3-body NMWD channel experimentally, in order to understand the discrepancy of the asymmetry papameter, and to test the ΔI = 1/2 rule for NMWD which are the main purposes of J-PARC 50 GeV PS experiment, E18 and E22.
MESON EXCHANGE MODEL WITH THE AXIAL VECTOR A1-MESON EXCHANGE AND HYPERNUCLEAR NONMESONIC DECAY ASYMMETRIES
Authors: Itonaga K. , Motoba T. , Rijken Th. A. , Ueda T.
Published: February 2011

The axial vector a1-meson exchange is introduced in the nonmesonic weak decay model. The a1-exchange is found to give remarkable modifications of the parity-conserving decay potentials in 1,3S → 1,3S and 3S1 → 3D1 channels at short range. Calculated asymmetry parameters αΛ for s- and p-shell hypernuclei in the 'π + 2π/ρ + 2π/σ + ω + K + ρπ/a1 + σπ/a1'-exchange model are obtained to be positive and small, which are consistent with the available data.
NEW ERA: STUDY LIGHT HYPERNUCLEI VIA TWO BODY DECAY PION SPECTROSCOPY USING CEBAF BEAM
Authors: Tang Liguang
Published: February 2011

Combined with high precision on two body decay pions and the unique features of hypernuclear electro-production mechanism, a new experiment aims to effectively access the hypernuclear continuum which offers insight on a wide range of light hypernuclei with variety of possible ( Z , A ) combinations via production of hyper-fragments. Precise binding energies of various hypernuclear species allow us to address on most of the leading puzzles and inconsistencies and may lead to new important discoveries and findings.
EXPLORING THE POTENTIAL OF ANTILAMBDAS IN NUCLEI WITH ANTIPROTONS
Authors: Pochodzalla Josef , Pomp Stephan
Published: February 2011

A schematic Monte Carlo simulation is used to examine the potential of exclusive hyperon-antihyperon pair production close to threshold in antiproton nucleus interactions to extract information on the interaction of antihyperons in nuclei. It is demonstrated that for [Formula: see text] pairs produced at antiproton momenta of 1.66 GeV/c the asymmetry is sufficiently sensitive even if the density as well as the momentum dependencies of the potentials are considered. Data taken earlier by the PS185 Collaboration prove that these measurements are feasible.
PRESENT STATUS OF J-PARC HADRON EXPERIMENTAL FACILITY
Authors: Sato Y. , Agari K. , Hirose E. , Ieiri M. , Katoh Y. , Kiyomichi A. , Minakawa M. , Muto R. , Naruki M. , Sawada S. , Suzuki Y. , Takahashi H. , Takasaki M. , Tanaka K. H. , Toyoda A. , Watanabe H. , Yamanoi Y. , Noumi H.
Published: February 2011

J-PARC Hadron Experimental Facility is designed to carry out a variety of particle and nuclear physics experiments with intense secondary particles generated by 750 kW proton beams. The first construction stage including the experimental hall, the primary beam line, and one secondary beam line (K1.8BR) has been completed at the end of December 2008. In order to handle the high intensity primary beam safely, we have developed many special devices working under severe radiation environment. The present article reports the current status of the Hadron Experimental Facility in detail.
A VIEW TOWARDS THE FUTURE OF STRANGENESS PHYSICS
Authors: Gibson B. F.
Published: February 2011

These observations provide a personal perspective regarding the physics presented during this Sendai International Symposium on Strangeness in Nuclear and Hadronic Systems. No attempt has been made to summarize the oral presentations in the sense of a traditional summary talk. Many presentations covered physics from others than that of the speaker. Hopefully, the ideas discussed will outlive the rapporteurs who so ably brought them to life at SENDAI08.
RATIONALITY OF SOME GROMOV–WITTEN VARIETIES AND APPLICATION TO QUANTUM K-THEORY
Authors: CHAPUT P.-E. , PERRIN N.
Published: February 2011

We show that for any minuscule or cominuscule homogeneous space X, the Gromov–Witten varieties of degree d curves passing through three general points of X are rational or empty for any d. Applying techniques of Buch and Mihalcea BM to constructions of the authors together with Manivel [5], we deduce that the equivariant K-theoretic three points Gromov–Witten invariants are equal to classical equivariant K-theoretic invariants on auxilliary spaces again homogeneous under Aut (X).
A GENERALIZED ANALYTICAL APPROACH FOR THE BUCKLING ANALYSIS OF THIN RECTANGULAR PLATES WITH ARBITRARY BOUNDARY CONDITIONS
Authors: RUOCCO EUGENIO , MINUTOLO VINCENZO , CIARAMELLA STEFANO
Published: February 2011

An analytical approach for studying the elastic stability of thin rectangular plates under arbitrary boundary conditions is presented. Because the solution is given in closed-form, the approach can be regarded as "exact" under the Kirchhoff–Love assumption. The proposed procedure allows us to obtain the buckling load and modal displacements that do not depend on the number of elements adopted in the numerical discretization using, say, the finite element method. Due to the fact that the longitudinal variation of the displacements is taken into account, the two-dimensional model established for the plate is considered "complete." Such an approach overcomes the shortcomings of conventional modeling presented in the literature. In order to demonstrate the generality of the proposed approach, several examples are prepared and the results obtained are compared with finite element and analytical solutions existing elsewhere.
FREE LONGITUDINAL VIBRATIONS OF BIMODULAR BEAMS: A COMPARATIVE STUDY
Authors: KHARENKO DENIS , PADOVANI CRISTINA , PAGNI ANDREA , PASQUINELLI GIUSEPPE , SEMIN LEONID
Published: February 2011

In this paper, we consider the problem of the free longitudinal vibrations of a beam made of a bimodular material, i.e. an elastic material whose in-tension Young's modulus is a fraction of that under compression. After recalling the exact solutions for an infinite beam and for a beam with fixed ends calculated via the characteristics method, we apply high-resolution methods based on the finite-element approach to solve the nonlinear equation of the motion. In particular, we compare the exact solutions with the numerical solutions calculated using the collocation and least-squares method developed in the present study, the space-time element method, as well as total variation diminishing (TVD) and Newmark methods.
SENSOR VALIDATION IN DAMAGE LOCATING VECTOR METHOD FOR STRUCTURAL HEALTH MONITORING
Authors: TRAN V. A. , QUEK S. T. , DUAN W. H.
Published: February 2011

The reliability of a structural health-monitoring system is very dependent on the quality of signals that are acquired and fed into the damage detection algorithm. Developed herein is an algorithm for sensor validation in the context of the damage locating vector (DLV) method for detecting damage in structures. Given the signals from ns sensors, ns combinatorial sets of signals from (ns - 1) sensors are formed. For each set, the change in the flexibility matrix relative to that of the reference or undamaged structure is computed and singular value decomposition is performed to estimate the number of nonzero singular values (NZV). The set that produces the smallest NZV is associated with healthy sensors whereas sensors that do not belong to that combination are suspected to be faulty. The performance of the proposed algorithm is illustrated using both simulated and experimental data obtained from a 3D modular truss structure monitored by sensors, some of which are faulty.
THEORETICAL STUDY OF THE STEREO-DYNAMICS OF THE REACTION O + HCl → ClO + H
Authors: WEI QIANG , XIE YING KE , FENG WEN LIN
Published: February 2011

Quasi-classical trajectory (QCT) method is used to study the stereo-dynamics of the title reaction on the ground 1 1A′ potential energy surface (PES). Differential cross-sections (DCSs) and alignments of the product rotational angular momentum for the reaction are reported. The influence of collision energy on the product vector properties is also studied in the present work. The distribution of angle between k and j′, P(θr), the distribution of dihedral angle denoting k-k′-j′ correlation, P(ϕr) ⋅ (2π/σ)( d σ00/ d ωt), (2π/σ)( d σ20/ d ωt), (2π/σ)( d σ22+/ d ωt) and (2π/σ)(dσ21-/dωt) have been calculated in the center of mass frame, respectively.
THEORETICAL STUDY ON INTERACTION BETWEEN IONIC LIQUIDS AND AROMATIC SULFUR COMPOUNDS
Authors: NIE YI , YUAN XIANGAI
Published: February 2011

It is important to understand how ionic liquids interact with aromatic sulfur compounds in view of ionic liquids application in desulfurization from fuels. Ion pairs of N, N-dialkylimidazolium dialkylphosphate ionic liquids were optimized at the Becke3LYP level of density functional theory. The most stable geometries were obtained. The stable ion pairs indicate there exist hydrogen bonding interactions between them. The calculated interaction energies of ion pairs were found to increase in magnitude with decreasing alkyl chain length, and with decreasing anionic radius. Furthermore, the interactions between the IL and aromatic sulfur compound, and benzene molecule were investigated. The results indicate that there exist hydrogen bonds between them. The calculated interaction energy between IL and sulfur compound is larger than that between IL and benzene. The aromatic ring π - π interaction and hydrogen bonding interaction may be the dominant factors to influence the trend of interaction between ILs and aromatic sulfur compounds.
AB INITIOCOMPUTATIONAL INVESTIGATIONS ON THE GAS-PHASE HOMODIMERIZATION AND KETO-ENOL TAUTOMERISM OF THE MONOCHALCOGENOCARBOXYLIC ACIDSCH3C(=O)XH (X = S, Se, Te)
Authors: LI QIANG-GEN , XUE YING , REN YI , WONG NING-BEW , LI WAI-KEE
Published: February 2011

Computational investigations on the gas-phase homodimerization and the keto-to-enol tautomerism of monochalcogenocarboxylic acids, CH3C(=O)XH (X = S, Se, Te) , were performed using ab initio molecular orbital methods (HF and MP2) with the 6-311+G(d, p) and 6-311+G(2df, 2df) basis sets. Calculated results indicate that the dimerization enthalpy values, ΔH, for the enol-dimers, [CH3C(=X)OH]2(X = S, Se, Te) , are notably higher than those for the corresponding keto-dimers, [CH3C(=O)XH]2(X = S, Se, Te) , while the ΔH values decrease as the electronegativity of chalcogen atom is lowered, for both the keto- and enol-dimers. It is found that the homodimerization of monochalcogenocarboxylic acids is thermodynamically unfavorable because the releasing dimerization heat cannot overcome the loss of entropy. This is contrasted with the case in the carboxylic acid, where the much higher dimerization enthalpy is responsible for the favorable dimerization in the gas phase. Our results also suggest that the tautomeric reactions of the monochalcogenocarboxylic acids in the gas phase may proceed by an eight-membered ring TS with intermolecular double proton transfer and lower tautomeric barrier, instead of by direct intramolecular proton transfer in monomer with a highly strained four-membered TS. The geometrical and energetic characteristics of the homodimers and tautomeric TSs are also further elucidated by NBO analysis.
THE PERFORMANCE OF SELECTED AB INITIO METHODS IN ESTIMATING ELECTRON BINDING ENERGIES OF SUPERHALOGEN ANIONS
Authors: SIKORSKA CELINA , IGNATOWSKA DOROTA , FREZA SYLWIA , SKURSKI PIOTR
Published: February 2011

The capability of reproducing the vertical electron detachment energies (VDE) of four representative superhalogen anions was tested using the selected ab initio (Hartree-Fock (HF), second, third, and fourth-order Møller-Plesset perturbational scheme (MP2, MP3, MP4), coupled-cluster CCSD(T), and outer valence Green function (OVGF)) methods together with the variety of one-electron basis sets. Certain theoretical treatments (e.g. MP2/aug–cc–pVTZ and MP2/6-311+G(3df)) were found to be satisfactory for preliminary estimates of electron binding energies of superhalogen anions, whereas the use of the OVGF/6-311+G(3df) approach has been proven to assure a very high accuracy of the results.