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Pedosphere 2011年第6期21卷 750-752页

作者： S.D.VErESOGLOU O.K.VOULGArI r.sen A.P.MAMOLOS D.S.VErESOGLOU Faculty of Agriculture Laboratory of Ecology and Environmental ProtectionAristotle University of Thessaloniki Department of Environmental and Geographical Sciences Manchester Metropolitan UniversityJohn Dalton Building

The potential role of soil pH in modulating plant productivity was assessed on the basis of dry mass, harvested in the form of 0.25 m2 quadrats, in two low-productivity upland grasslands of northern Greece subjected to annual factorial nitrogen （N） and phosphorus （P） fertilization （15 g N m-2 year-1 and 10 g P m-2 year-I） over a minimum period of 3 years. It was hypothesized that under these particular conditions, a positive relationship would exist between soil pH and plant productivity and, further, that N or P fertilizer application of a nutrient limited system, would result in a weakening of this positive relationship. A significant positive relationship was confirmed between soil pH and plant productivity in one of the two study areas and a positive trend in the other. Moreover, plant productivity increase, following fertilization, appeared to have a detrimental effect on the soil pH-plant productivity relationship. Findings support the original hypotheses and strengthen the idea that plant diversity-mediated soil pH-plant productivity relationships are a result of the more intense plant speciation that occurred under the more ＂typical＂ soil conditions of higher pH in temperate as opposed to tropical regions

关键词： altitude ecological patterns low productivity grasslands temperate ecosystems

Heat-denatured and alcalase-hydrolyzed protein films/coatings containing marjoram essential oil and thyme extract

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Food Bioscience 2022年第1期45卷 65-74页

作者： Ozgür Tarhan rana sen Department of Food Engineering Faculty of EngineeringUsak University64100UsakTurkey

In this study,heat-denatured and alcalase-hydrolyzed whey and soy protein films/coatings containing marjoram essential oil(MEO)and thyme extract(TE)were investigated comparatively in terms of physicochemical and functional ***-denaturated high protein solutions produced self-standing,smooth,transparent and viscoelastic films in the pr.sence of *** hydrolysis provided transparency,elasticity and extensibility to the films of low protein *** addition of MEO and TE triggered hardness and brittleness especially in hydrolyzed high protein films and remarkably changed film color,thickness and viscosity possibly affecting surface adherence of *** denatured films exhibited higher water vapor permeability(WVP)than alcalase-hydrolyzed *** lowest hardness was obtained in hydrolyzed low protein films with considerable *** protein solutions coated to cheese provided better protection against moisture loss and MEO added films caused elevated hardening of *** and TE incorporated in film matrices were seemed to suppress mycelial growth and sporulation of Aspergillus *** study pr.sented valuable new findings on functional protein films produced by enzymatic hydrolysis as an alternative to heat treatment.

关键词： Whey Soy Films and coatings Marjoram essential oil Enzyme hydrolysis

Aflatoxin B1： Toxicity, bioactivation and detoxification in the polyphagous caterpillar Trichoplusia ni

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Insect Science 2013年第3期20卷 318-328页

作者： ren sen Zeng Zhimou Wen Guodong Niu r. Berenbaum State Key Laboratory of Conservation and Utilization of Subtropical Agricultural Bio-resources South China Agricultural University Guangzhou China Department of Entomology University of Illinois Urbana Department of Cell and Developmental Biology University of Illinois Urbana Illinois United States

Trichoplusia ni caterpillars are polyphagous foliage-feeders and rarely likely to encounter aflatoxin B1 （AFB1）, a mycotoxin produced by Aspergillus flavus and A. parasiticus, in their host plants. To determine how T. ni copes with AFB 1, we evaluated the toxicity ofAFB 1 to T. ni caterpillars at different developmental stages and found that AFB 1 tolerance significantly increases with larval development. Diet incorporation of AFB 1 at 1μg/g completely inhibited larval growth and pupation of newly hatched larvae, but 3μg/g AFB 1 did not have apparent toxic effects on larval growth and pupation of caterpillars that first consume this compound 10 days after hatching. Piperonyl butoxide, a general inhibitor of cytochrome P450 monooxygenases （P450s）, reduced the toxicity of AFB 1, suggesting that AFB1 is bioactivated in T. ni and this bioactivation is mediated by P450s. Some plant allelochemicals, including flavonoids such as fiavones, furanocoumarins such as xanthotoxin and imperatorin, and furanochromones such as visnagin, that induce P450s in other lepidopteran larvae ameliorated AFBI toxicity, suggesting that P450s are also involved in AFB 1 detoxification in T. ni.

关键词： aflatoxin allelochemical bioactivation cytochrome P450 monooxygenase,flavone Helicoverpa zea imperatorin mycotoxin piperonyl butoxide Trichoplusia ni,visnagin xanthotoxin

real-time recognition of human lower-limb locomotion based on exponential coordinates of relative rotations

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Science China(Technological Sciences) 2021年第7期64卷 1423-1435页

作者： XU sen DING Ye State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai200240China

This paper proposes a data-driven method using a parametric repr.sentation of relative rotations to classify human lower-limb locomotion, which is designed for wearable robots. Three Inertial measurement units(IMUs) are mounted on the subject's waist,left knee, and right knee, respectively. Features for classification comprise relative rotations, angular velocities, and waist acceleration. Those relative rotations are repr.sented by the exponential coordinates. The rotation matrices are normalized by Karcher mean and then the Support Vector Machine(SVM) method is used to train the data. Experiments are conducted with a time-window size of less than 40 ms. Three SVM classifiers telling 3, 5 and 6 rough lower-limb locomotion types respectively are trained, and the average accuracies are all over 98%. With the combination of those rough SVM classifiers, an easy SVMbased ensembled-system is proposed to classify 16 fine locomotion types, achieving the average accuracy of 98.22%, and its latency is 18 ms when deployed to an onboard computer.

关键词： locomotion recognition exponential coordinate relative rotation support vector machine

A novel(2+1)-dimensional integrable KdV equation with peculiar solution structures

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Chinese Physics B 2020年第8期29卷 176-181页

作者： sen-Yue Lou School of Physical Science and Technology Ningbo UniversityNingbo 315211China

The celebrated(1+1)-dimensional Korteweg de-Vries(KdV)equation and its(2+1)-dimensional extension,the Kadomtsev-Petviashvili(KP)equation,are two of the most important models in physical *** KP hierarchy is explicitly written out by means of the linearized operator of the KP equation.A novel(2+1)-dimensional KdV extension,the cKP3-4 equation,is obtained by combining the third member(KP3,the usual KP equation)and the fourth member(KP4)of the KP *** integrability of the cKP3-4 equation is guaranteed by the existence of the Lax pair and dual Lax *** cKP3-4 system can be bilinearized by using Hirota's bilinear operators after introducing an additional auxiliary *** solutions of the cKP3-4 equation possess some peculiar and interesting properties which are not valid for the KP3 and KP4 *** instance,the soliton molecules and the missing D'Alembert type solutions(the arbitrary travelling waves moving in one direction with a fixed model dependent velocity)including periodic kink molecules,periodic kink-antikink molecules,few-cycle solitons,and envelope solitons exist for the cKP3-4 equation but not for the separated KP3 equation and the KP4 equation.

关键词： (2+1)-dimensional KdV equations Lax and dual Lax pairs soliton and soliton molecules D’Alembert type waves

Dynamic characteristics in an external-cavity multi-quantum-well laser

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Chinese Physics B 2018年第6期27卷 185-194页

作者： sen-Lin Yan Department of Electronic Engineering Nanjing Xiaozhuang University Nanjing 211171 China

This paper outlines our studies of bifurcation, quasi-periodic road to chaos and other dynamic characteristics in an external-cavity multi-quantum-well laser with delay optical feedback. The bistable state of the laser is predicted by finding theoretically that the gain shifts abruptly between two values due to the feedback. We make a linear stability analysis of the dynamic behavior of the laser. We predict the stability scenario by using the characteristic equation while we make an approximate analysis of the stability of the equilibrium point and discuss the quantitative criteria of bifurcation. We deduce a formula for the relaxation oscillation frequency and prove theoretically that this formula function relates to the loss of carriers transferring between well regime and barrier regime, the feedback level, the delayed time and the other intrinsic parameters. We demonstrate the dynamic distribution and double relaxation oscillation frequency abruptly changing in periodic states and find the multi-frequency characteristic in a chaotic state. We illustrate a road to chaos from a stable state to quasi-periodic states by increasing the feedback level. The effects of the transfers of carriers and the escaping of carriers on dynamic behavior are analyzed, showing that they are contrary to each other via the bifurcation diagram. Also,we show another road to chaos after bifurcation through changing the linewidth enhancement factor, the photon loss rate and the transfer rate of carriers.

关键词： bifurcation chaos multi-quantum-well laser optical feedback

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 pr.sented 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

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 Shour.seni 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 *** pr.sence 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

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