29,508 research outputs found
Surface structure of K/Pd(100) and the effect of H coadsorption: Density functional theory calculations
No full textWe have performed density-functional theory calculations to study the atomic structure of the K/Pd(100)-p(2 x 2) and -c(2 x 2) surfaces formed at 0.25 ML and 0.5 ML, respectively. We find that K atoms prefer the hollow site with the K adsorption height 2.44 angstrom for p(2 x 2) and 2.50 angstrom c(2 x 2). The first interlayer spacing (d(12)) of the Pd(100) substrate appears slightly contracted from the bulk value as Ad(12) = -0.8% and -0.3% for p(2 x 2) and c(2 x 2), respectively. The calculated contraction Delta d(12) = -0.3% for c(2 x 2) is not in accord with the expansion Ad(12) = +1.3% reported by a low-energy electron diffraction (LEED) study. As the origin of this difference, a possibility of hydrogen contamination of the surface sample used in the LEED study is suggested: Our calculations show that the d(12) of K/Pd(100)-c(2 x 2) increases linearly with the coverage of H coadsorption, which leads to an estimation for the H coverage of the surface sample as 0. 1-0.4 ML. (c) 2006 Elsevier B.V. All rights reserved.X112sciescopu
Study on Solar KANG Heating System for Cold Areas
No full textAbstractThe current rural traditional heated kang cannot meet people's increasing requirements of comfort and environmental protection. This paper propose solar kang heating system in cold regions. System performance and heating effect were analyzed. We selected two typical rooms. One was set in traditional kang, and the other one was solar Kang type. Using temperature recording instrument and 64 roads inspection instrument and other instruments, we test the indoor temperature and the kang surface temperature of two rooms. Solar kang thermal resistance, heat storage, heat dissipation and heating effect were analyzed and compared. The results of the study show this system have the smaller fluctuation, more comfort while alleviating the kang surface overheat or super-cooling problem. It satisfied the requirements of indoor thermal comfort. The warming rate is 5.17°C/h, and the cooling rate is 3.01°C/h. These are slower than traditional Huokang speed. It improved the heat storage capacity of kang body with surface heat dissipation 1237W. Average temperature of the solar kang heating room was improved 3.28°C. It gets the smaller indoor temperature fluctuation. PMV values are concentrated about -0.5, and this basically meet the requirements of the user comfort
Dry-Stack Masonry Wall Modeling Using Finite-Element Method
No full textMasonry has been used throughout the world and in heritage and historical structures. For this study, two-dimensional (2D) nonlinear finite-element models based on a micromodeling approach were constructed in order to model deformation characteristics of historical stone masonry shear walls subject to combined axial compression and lateral loading. For calibration and validation of the numerical models, previous experimental tests results were considered. To assess critical parameter effects on the behavior of the walls, sensitivity analysis on the calibrated model was conducted. To obtain the overall energy absorption capability of the walls, the loading protocol, and load-displacement hysteresis curves, cyclic analysis of the calibrated model for the dry-stack mortarless sawn stone masonry walls was performed. Numerical analysis results were then compared with experimental test results with general agreement found.N
Validation of Numerical Modeling Techniques for Unbonded Post-Tensioned Beams under Low Velocity Impact
No full textThis study validates the use of available tools for nonlinear finite element dynamic analysis (NLFEDA) modeling of unbonded post-tensioned reinforced concrete (PT-RC) members under drop weight impact and is the first attempt at low-velocity impact to the authors' knowledge. The study was performed in two parts. The first portion of the study determined the appropriate mesh and material properties of the testing setup and specimens that were generated by the authors. The second portion of the study then established the level of convergence of the model based on a wide range of design and loading parameters. The NLEFDA was validated using experimental data obtained from laboratory investigations on the behavior of shear-critical and flexural PT-RC members. The interaction between the prestress, as applied from the PT tendon, and the surrounding concrete was well modeled in the presence of large shear failures of the concrete. The modeling techniques, coupled with experimental studies, can be helpful in expanding the range of understanding of the behavior of unbonded PT-RC members.N
Anomalous metal-insulator transition in BaCo1-xNixS2-y as a triggered phase transition
No full textThe anomalous metal-insulator transition in BaCo1-xNixS2-y is identified as a triggered phase transition based on strong coupling between a magnetic and a structural order parameter. In particular, we observe a second-order paramagnetic-antiferromagnetic transition at TN followed by a first-order metal-insulator transition at T-MI. The field-induced shifts of the sequential transition temperatures are determined for y = 0.05: dT(N)/dB = (-0.8 +/- 0.2) K/T, and (-0.1 +/- 0.1) K/T less than or equal to dT(MI)/dB less than or equal to (-0.5 +/- 0.1) K/T
Steric effects of ions in the charge-related wetting phenomena
No full textSteric effects of ions on the charge-related wetting phenomena are studied. Along with a general treatment, three specific problems in two-dimensional system are considered: a droplet on an electrode, a droplet on a charged surface, and an electrowetting phenomenon on a dielectric. For computation of wetting tension, the electromechanical approach is adopted with the principle of mechanical force balance for each phase. The modified Poisson-Boltzmann equation, which was originally proposed by Bikerman [Philos. Mag. 33, 384 (1942)], is adopted for the analysis of the steric effects. It is found that the steric hindrance reduces significantly both the osmotic pressure and the electrical stress near the triple contact line. This reduction results in a considerable decrease in the wetting tension when the ratio of the capacitance per unit area of the electrical double layer to that of the dielectric layer is small.X11
Measurement of time-dependent C P violation parameters in B 0 → K S 0 K S 0 K S 0 decays at Belle
No full textPacific Northwest National Laboratory http://dx.doi.org/10.13039/100011661Ministry of Education, Culture, Sports, Science and Technology http://dx.doi.org/10.13039/501100001700Japan Society for the Promotion of Science http://dx.doi.org/10.13039/501100001691Tau-Lepton Physics Research Center of Nagoya University http://dx.doi.org/10.13039/501100004823National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809Chinese Academy of Sciences http://dx.doi.org/10.13039/501100002367Austrian Science Fund http://dx.doi.org/10.13039/501100002428Center for Excellence in Particle Physics http://dx.doi.org/10.13039/501100015710Ministerstvo Školství, Mládeže a T?lovýchovy http://dx.doi.org/10.13039/501100001823Carl-Zeiss-Stiftung http://dx.doi.org/10.13039/100007569Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659Volkswagen Foundation http://dx.doi.org/10.13039/501100001663Department of Science and Technology, Ministry of Science and Technology http://dx.doi.org/10.13039/501100001409Instituto Nazionale di Fisica Nucleare http://dx.doi.org/10.13039/501100004007National Research Foundation of Korea http://dx.doi.org/10.13039/501100003725Global Science Experimental Data Hub Center and KREONET/GLORIAD of the Korea Institute of Science and Technology Information http://dx.doi.org/10.13039/501100003708Polish Ministry of Science and Higher Education http://dx.doi.org/10.13039/501100004569Ministry of Education and Science of the Russian Federation http://dx.doi.org/10.13039/501100003443University of Tabuk http://dx.doi.org/10.13039/100009391Javna Agencija za Raziskovalno Dejavnost RS http://dx.doi.org/10.13039/501100004329Ikerbasque, Basque Foundation for Science http://dx.doi.org/10.13039/501100003989Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung http://dx.doi.org/10.13039/501100001711Ministry of Science and Technology, Taiwan http://dx.doi.org/10.13039/501100004663National Science Foundation http://dx.doi.org/10.13039/100000001U.S. Department of Energy http://dx.doi.org/10.13039/100000015Australian Research Council http://dx.doi.org/10.13039/501100000923Environmental Molecular Sciences LaboratoryNational Institute of Informatics, and Science Information NETwork 5Shanghai Pujiang ProgramRadiation Science Research InstituteNational Science CenterKEKB GroupKEK Cryogenics GroupKEK Computer GroupForeign Large-size Research Facility Application Supporting Projec
Raw and preprocessed data: Talluri, Kang et al. 2022
No full textExample raw data, preprocessed data to reproduce analyses in Talluri, Kang et al. 2022 bioRxiv. doi: 10.1101/2022.09.08.507006. (now in press at Nature Neuroscience).The code to reproduce the analysis is in https://github.com/NienborgLab/TalluriKang_et_al_2022.Raw and preprocessed data files are in .mat format.If you use the data or the code, please cite: Talluri, B. C., Kang I., Lazere, A., Quinn, K. R., Kaliss, N., Yates, J.L., Butts, D.A., Nienborg, H. (2022). Activity in primate visual cortex is minimally driven by spontaneous movements. bioRxiv. 2022.09.08.507006. doi: https://doi.org/10.1101/2022.09.08.507006</p
Spectral analysis of the Neumann-Poincaré operator and characterization of the stress concentration in anti-plane elasticity
No full textWhen holes or hard elastic inclusions are closely located, stress which is the gradient of the solution to the anti-plane elasticity equation can be arbitrarily large as the distance between two inclusions tends to zero. It is important to precisely characterize the blow-up of the gradient of such equation. In this paper we show that the blow-up of the gradient can be characterized by a singular function defined by the single layer potential of an eigenfunction corresponding to the eigenvalue 1/2 of a Neumann-Poincaré type operator defined on the boundaries of the inclusions. By
comparing the singular function with the one corresponding to two disks osculating
to the inclusions, we quantitatively characterize the blow-up of the gradient in terms
of explicit functions. In electrostatics, our results apply to the electric field, which is the gradient of the solution to the conductivity equation, in the case where perfectly conducting or insulating inclusions are closely located
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