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Displacement-based seismic design of flat slab-shear wall buildings

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Earthquake Engineering and Engineering Vibration 2016年第2期15卷 209-221页

作者： Subhajit sen Yogendra Singh Department of Earthquake Engineering IIT Roorkee

Flat slab system is becoming widely popular for multistory buildings due to its several advantages. However, the performance of flat slab buildings under earthquake loading is unsatisfactory due to their vulnerability to punching shear failure. Several national design codes provide guidelines for designing flat slab system under gravity load only. Nevertheless, flat slab buildings are also being constructed in high seismicity regions. In this paper, performance of flat slab buildings of various heights, designed for gravity load alone according to code, is evaluated under earthquake loading as per ASCE/SEI 41 methodology. Continuity of slab bottom reinforcement through column cage improves the performance of flat slab buildings to some extent, but it is observed that these flat slab systems are not adequate in high seismicity areas and need additional primary lateral load resisting systems such as shear walls. A displacement-based method is proposed to proportion shear walls as primary lateral load resisting elements to ensure satisfactory performance. The methodology is validated using design examples of flat slab buildings with various heights.

关键词： satisfactory continuity vulnerability validated reinforcement gravity walls drift alone details

Grey Wolf Optimizer with Ranking-Based Mutation Operator for IIR Model Identification

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Chinese Journal of Electronics 2018年第5期27卷 1071-1079页

作者： ZHANG sen ZHOU Yongquan College of Information Science and Engineering Guangxi University for Nationalities School Key Laboratory of Guangxi High Schools Complex System and Computational Intelligence

A variant of Grey wolf optimizer(GWO),called grey wolf optimizer with Ranking-based mutation operator(RGWO) is applied to the Infinite impulse response(IIR) system identification problem. RGWO makes GWO faster and more robust. In RGWO, the rankingbased mutation operator is integrated into the GWO to accelerate the convergence speed, and thus enhance the performance. The simulation results over several models are presented and statistically validated. Compared to other robust evolutionary algorithms, RGWO performs significantly better in terms of the quality, speed, and the stability of the final solutions.

关键词： System identification IIR system Grey wolf optimizer Ranking-based mutation operator

Aberrant cell cycle induction is pivotal for mitochondrial biogenesis after traumatic brain injury

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Neural Regeneration Research 2019年第7期14卷 1215-1216页

作者： Nilkantha sen Department of Neurological Surgery University of Pittsburgh

Cell cycle regulation and brain injury:Traumatic brain injury(TBI)is one of the primary causes of morbidity and mortality in patients,and it affects more than 1.7 million Americans each *** than direct damage resulting from TBI,the brain injury triggers several secondary mechanisms which either individually or in combination contribute to the neurological deficits after TBI(Gupta and sen,2016).These secondary mechanisms include neuronal death and stimulate proliferation of astrocytes and microglial cells,which in turn triggers neuro-inflammation(Simon et al.,2017).

关键词： Cell cycle brain injury direct damage

Geospatial characteristics of fire occurrences in southern hemispheric Africa and Madagascar during 2001-2020

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Journal of Forestry Research 2023年第2期34卷 553-563页

作者： Chuyan Wan Shouraseni sen Roy Department of Earth and Planetary Sciences Northwestern UniversityEvanstonILUSA Department of Geography and Sustainable Development University of MiamiCoral GablesFLUSA

For this study of long-term spatial patterns and trends of active fires in southern hemispheric Africa and on Madagascar from 2001 to 2020,active fire data from the MODIS FIRMS global fire data products were *** annual center of fire concentration tended to migrate toward the preserved rainforests and nature conservation areas in the Congo Basin and the mountain forests on the northeastern coast of *** frequency varied seasonally at both study *** used geo statistical analysis techniques,such as measures of dispersion and emerging hot spot analysis,to reveal long-term trends in spatial patterns of fire *** southern hemispheric Africa,the observed active fires tended to drift northward toward the Zambia-DRC border in the Congo *** northward migration progressed toward humid rainforests,which were better suited to sustaining repeated fire *** Madagascar,the observed active fires tended to migrate toward the east coast in protected mountain *** spatial patterns of long-term trends showed a concentration of fires in the tropical regions of southern hemispheric ***,smaller clusters of new hot spots were located over eastern South Africa,overlapping with undifferentiated *** Madagascar,both hot and cold spots were identified and were separated by the highland region in the center of the *** of the eastern island was characterized by cold spots that received less precipitation than did the rest of the *** presence of increasing hots spots in the densely vegetated areas highlights the urgent need for fire prevention and management in this region.

关键词： Emerging hot spots analysis FIRMS Forest fi res Madagascar MODIS Southern hemispheric Africa Wildfi res

Some Special Types of Multisoliton Solutions of the Nizhnik-Novikov-Vesselov

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Chinese Physics Letters 2000年第11期17卷 781-783页

作者： LOU sen-Yue Department of Applied Physics Shanghai Jiao Tong UniversityShanghai

Using the standard truncated Painleve analysis,we have obtained some new special types of soliton solutions of a(2-pl)-dimensional integrable model,the Nizhnik-Novikov-Vesselov *** from the standard truncation approach in the Painleve analysis,one can obtain a Backlund transformation to find a new solution from a known ***,one can obtain only a single solitary wave solution from the Backlund transformation related to the truncated Painleve analysis starting from the trivial vacuum *** this paper,we find some special types of the multisoliton solutions from the truncated Painleve analysis and the trivial vacuum solution.

关键词： solution. equation. soliton

The secular effect of gravitational radiation damping on the periastronadvance of binary stars in second order perturbation theory

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Research in Astronomy and Astrophysics 2017年第8期17卷 81-88页

作者： Lin-sen Li School of Physics Northeast Normal University Changchun 130024 China

The second order perturbation effect of gravitational radiation damping on the periastron advance of binary stars is *** second order analytic solution is obtained based on the first order theory in the 2014 article by *** results show that secular variation exists in the periastron advance of binary stars in the second order theory,but secular variation does not exist in the first order perturbation *** results for two compact binary stars(PSR J0737–3039 and M33 X-7)are given,demonstrating the theoretical significance even though the effect is very small.

关键词： binaries close—gravitational wave—celestial mechanics

Eradication of Solenopsis invicta by pyriproxyfen at the Shihmen Reservoir in northern Taiwan

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Insect Science 2009年第6期16卷 493-501页

作者： Ji-sen Hwang Department of Natural Science Graduate School of Environmental Education and Resources Taipei Municipal University of EducationTaiwan China

The aim of this study was to investigate the possibility of eradicating the red imported fire ant, Solenopsis invicta Buren, in the hot, humid and rainy conditions of northern Taiwan. Thirteen hectares of the Shihmen Reservoir have been infected with these ants, with a total of 1 578 mounds. Pyriproxyfen was applied at a rate of 2 kg/hectare each season, for a total of four seasons. Surveys using visual examination, bait traps, as well as the population index method showed that the brood, the reproductive ants, and the worker ants within the nests were all significantly reduced 1 month after the first application of pyriproxyfen. Four months after the initial application there were no more brood or reproductive ants. After 8 months there were no longer any active mounds left, and 12 months later there were no more worker ants. After monitoring for 1 more year, it was ascertained that the red imported fire ants were eradicated. The percentages of decrease after 2, 4 and 6 months of treatment were 57.4%, 80.5%, and 98.2%, respectively.

关键词： eradication insect growth regulator pyriproxyfen red imported fire ant,Solenopsis invicta

Investigation of the methane hydrate surface area during depressurization-induced dissociation in hydrate-bearing porous media

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Chinese Journal of Chemical Engineering 2021年第4期34卷 324-334页

作者： Xuke Ruan Xiao-sen Li Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640China CAS Key Laboratory of Gas Hydrate Guangzhou 510640China

The surface area of hydrate during dissociation in porous media is essentially important for the kinetics of hydrate *** this study,the methane hydrate surface area was investigated by the comparison results of experiments and numerical simulations during hydrate decomposition in porous *** experiments of methane hydrate depressurizationinduced dissociation were performed in a 1D high pressure cell filled with glass beads,an improved and valid 1D corescale numerical model was developed to simulate gas *** conceptual models for hydrate dissociation surface area were proposed based on the morphology of hydrate in porous media,which formed the functional form of the hydrate dissociation surface area with porosity,hydrate saturation and the average radius of sand sediment *** the establishment of numerical model for depressurizationinduced hydrate dissociation in porous media,the cumulative gas productions were modeling and compared with the experimental data at the different hydrate *** results indicated that the proposed prediction equations are valid for the hydrate dissociation surface area,and the graincoating surface area model performs well at lower hydrate saturation for hydrate dissociation simulation,whereas at higher hydrate saturation,the hydrate dissociation simulation from the porefilling surface area model is more ***,the sensitivity analysis showed that the hydrate dissociation surface area has a significant impact on the cumulative gas production.

关键词： Surface area Methane hydrate Hydrate dissociation Hydrate morphology Depressurization

Nonlinear Branching Processes with Immigration

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Acta Mathematica Sinica,English Series 2017年第8期33卷 1021-1038页

作者： Pei-sen LI School of Mathematical Sciences Beijing Normal UniversityBeijing 100875P.R.China

The nonlinear branching process with immigration is constructed as the pathwise unique solution of a stochastic integral equation driven by Poisson random measures. Some criteria for the regularity, recurrence, ergodi... 详细信息

关键词： Nonlinear branching process immigration stochastic integral equation regularity recurrence ergodicity strong ergodicity