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Collapse arrest in the space-fractional Schrodinger equation with an optical lattice

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Chinese Physics B 2021年第10期30卷 328-333页

作者： Manna Chen Hongcheng Wang Hai Ye Xiaoyuan huang Ye Liu Sumei hu wei hu School of Electrical Engineering and Intelligentization Dongguan University of TechnologyDongguan 523808China Department of Physics Guangdong University of Petrochemical TechnologyMaoming 525000China Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices South China Normal UniversityGuangzhou 510006China

The soliton solution and collapse arrest are investigated in the one-dimensional space-fractional Schrodinger equation with Kerr nonlinearity and optical *** approximate analytical soliton solutions are obtained based on the variational approach,which provides reasonable ***-stability analysis shows that all the solitons are linearly *** collapses are found when the Levy index 1<α≤***α=1,the collapse is arrested by the lattice potential when the amplitude of perturbations is small *** is numerically proved that the energy criterion of collapse suppression in the two-dimensional traditional Schrodinger equation still holds in the one-dimensional fractional Schr odinger *** physical mechanism for collapse prohibition is also given.

关键词： soliton solution collapse variational approach nonlinear Schrodinger equation

Dynamic Comprehensive Assessment of Power Development Based on Provincial Data

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CSEE Journal of Power and Energy Systems 2020年第3期6卷 672-680页

作者： wei hu Qiuting Guo Yifan Zhou Yi Kang huanshuai Bing Dan Bao State Key Lab of Power Systems the Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Central Southern China Electric Power Design Institute China Power Engineering Consulting Group CorporationWuhan 430071China Northeast Branch State Grid Corporation of ChinaShenyang 110180China

Dynamic comprehensive assessment of regional power industry development levels is of paramount importance for understanding the development characteristics and potential of the local power industry.A tri-level evaluation index system is established,describing five aspects of the local power industry development level,specifically,the coordination degree between the power industry and economy/energy,power generation,power consumption,power supply and development potential.A combination of information entropy and the analytic hierarchy process(AHP)is used to establish a static evaluation model,and a blend of subjective opinions and objective data information is then *** aggregating the static evaluation model for each time period based on a time-ordered weighting vector calculated using time-ordered information entropy,a dynamic comprehensive evaluation model of power industry development level is *** considering provincial data from China recorded during 2007 to 2016 as the sample set,through synchronic and diachronic comparisons of the evaluation results,the differences,characteristics and potential of local power industry development in China are explored.

关键词： Analytic hierarchy process development level of power electric industry dynamic comprehensive assessment information entropy

A Pragmatic Method to Determine Transient Stability Constrained with Interface Real Power Flow Limits via Power System Scenario Similarity

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CSEE Journal of Power and Energy Systems 2020年第1期6卷 131-141页

作者： Xianzhuang Liu Yong Min Lei Chen Xiaohua Zhang Changyou Feng wei hu Department of Electrical Engineering Tsinghua UniversityBeijing 100084China State Grid Jibei Electric Power Company Beijing 100053China State Grid Corporation of China Beijing 100031China.

In practical power systems,operators generally keep interface flowing under the transient stability constrained with interface real power flow limits(TS-IRPFL)to guarantee transient stability of the *** methods of computing TS-IRPFL have been ***,in practice,the method widely used to determine TS-IRPFL is based on selection and analysis of typical scenarios as well as scenario ***,typical scenarios are selected and analyzed to obtain accurate limits,then the scenario to be analyzed is matched with a certain typical scenario,whose limit is adopted as the forecast *** this paper,following the steps described above,a pragmatic method to determine TS-IRPFL is *** proposed method utilizes data-driven tools to improve the steps of scenario selection and *** of all,we formulate a clear model of power system scenario *** on the similarity model,we develop a typical scenario selector by clustering and a scenario matcher by nearest neighbor *** proposed method is pragmatic because it does not change the existing ***,it is much more reasonable than the traditional *** results verify the validity of the method.

关键词： Clustering data-driven nearest neighbor power system scenario similarity transient stability constrained interface real power flow limit(TSC-IRPFL) typical scenario.

Dynamic Camouflage Characteristics of a Thermal Infrared Film Inspired by Honeycomb Structure

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Journal of Bionic Engineering 2022年第2期19卷 458-470页

作者： Lujia Li huanhuan Li Gang Kou Dafeng Yang wei hu Jinghui Peng Songjing Li Department of Fluid Control and Automation Harbin Institute of TechnologyHarbin 150001China Research Institute for National Defense Engineering of Academy of Military Science PLA China Luoyang 471023China

Thermal infrared camouflage technology has attracted increasing attention with the progress of infrared surveillance *** by honeycombs,a thermal infrared camouflage film with honeycomb sandwich structure based on fluid and temperature control is proposed to cloak objects and display false targets in the thermal infrared *** structure and manufacturing method of the film are introduced,and the fluid and temperature control system is established and tested to explore the thermal infrared characteristics of the film composed of different thermal *** camouflage performance of the film is intuitively displayed through the temperature frequency histograms of the infrared images photographed by an infrared *** temperature control accuracy of the thermal infrared camouflage system and the dynamic camouflage response of the film are evaluated by the temperature distribution map of each pixel in infrared images and the salient degree ***,the influential factors on the camouflage responding time are investigated,including the heating and cooling time of the liquid,the flow rate of pumps inside the driving module,and the energy loss along the liquid *** application of displaying false target is also introduced and *** results show that the camouflage film has a well camouflage effect and a wide adjustment temperature range,showing promise for a broad range of potential applications,such as counter-surveillance,thermal control and heat shielding.

关键词： Bioinspiration Film Thermal camoufage Honeycomb structure Temperature control

Pediatric Acute Severe Hepatitis of Unknown Origin: What is New?

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Journal of Clinical and Translational Hepatology 2022年第3期10卷 509-514页

作者： Jing Li wei hu Ji-Yuan Zhang Fu-Sheng Wang Peking University 302 Clinical Medical School BeijingChina Senior Department of Infectious Diseases The Fifth Medical Center of Chinese PLA General HospitalBeijingChina

Globally,there are emerging cases of acute severe hepatitis of unknown origin in *** cases have gathered increasing attention,owing to the development of acute liver failure in some cases that resulted in liver *** review briefly summarizes the outbreak and diagnostic criteria of the *** further discuss the possible causes and related mechanisms underlying its occurrence and progression,and analyze the challenges in ***,this review emphasizes patient management in clinical settings and a combination of efforts to unmask the disease.

关键词： Hepatitis Children Diagnostic Mechanism Management

Shock wave and bubble characteristics of underwater array explosion of charges

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Defence Technology（防务技术） 2022年第8期18卷 1445-1453页

作者： Hong-wei hu Pu Song Shuang-feng Guo Hai-yun Feng Dao-kui Li College of Aerospace Science and Engineering National University of Defense TechnologyChangsha410073HunanChina Xi'an Modern Chemistry Research Institute Xi'an710065ShaanxiChina hunan Key Laboratory of Intelligent Planning and Simulation for Aerospace Missions Changsha410073HunanChina

In this study, we focused on the effect of the underwater explosion parameters of multi-point array explosion. The shock wave and bubble parameters of aggregate charge, two charges, and four charges were measured through an underwater explosion test, and their influence on the explosion power field of charge quantity and array distance was analyzed. Results show that the multi-shock wave collision of array explosion can be approximated to a linear superposition, and the interaction of delayed shock wave can be deemed as the increase of the shock wave baseline. Shock wave focusing and delayed superposition increase the shock wave peak pressure. Compared with the aggregate charge, the greater the number of array explosion points is, the higher the impulse and the gain of the bubble peak pressure are. At the same array distance, the smaller the charge quantity is, the higher the bubble impulse will be. At the same charge quantity, the smaller the array distance is, the higher the bubble impulse will be. The bubble period decreases gradually with the increase of the charge quantity, but the test orientation has little effect on the bubble period.

关键词： Explosion mechanics Underwater explosion Array explosion Shock waveBubble

Influence of vegetation type and topographic position on volumetric soil water content dynamics and similarity among surface and deep soil layers

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International Soil and Water Conservation Research 2023年第1期11卷 183-196页

作者： Muxing Liu Qiuyue Wang Jun Yi Hailin Zhang Ji Liu wei hu Key Laboratory for Geographical Process Analysis&Simulation Hubei ProvinceWuhan430079China College of Urban and Environmental Sciences Central China Normal UniversityWuhan430079China The New Zealand Institute for Plant and Food Research Limited Private Bag 4704Christchurch8140New Zealand

Clarifying the mechanisms governing volumetric soil water content(VSWC)dynamics in soil profiles is essential,as it can help to elucidate soil water transport processes and improve the prediction accuracy of soil hydrological *** Spearman's rank correlation and wavelet coherence analysis methods,similarity in soil profile VSWC dynamics and factors governing VSWC soil profile dynamics in upslopes and downslopes under three vegetation types(evergreen forest[EG],secondary deciduous forest mixed with shrubs[SDFS],and deforested pasture[DP])at different time scales(hourly,daily,weekly,and monthly)and in different seasons were *** results revealed significant similarity in the VSWC of different soil depths(Pweekly(42.8%)>daily(21.8%).The effects of soil properties(e.g.,texture,saturated hydraulic conductivity),rainfall,and potential evapotranspiration(ET_(p))on VSWC similarity were related to the time scale and season in which VSWC monitoring took *** properties had apparent effects on VSWC similarity at longer time scales(i.e.,monthly),with a high *** contrast,the effects of rainfall and ET_(p) on VSWC similarity were concentrated at weekly and daily scales,with a relatively low *** and ET_(p) dominated VSWC dynamics in the summer and fall,*** results imply the use of measured VSWC at one soil depth to predict the VSWC at other soil depths was a reliable *** the in-fluence of time scale effects and seasonal variations on prediction accuracy of VSWC should be considered.

关键词： Volumetric soil water content Wavelet analysis Significant coherence area Time scale Vegetation type Slope postion

Individual and interactive influences of elevated air temperature and soil drought at the flowering and boll-forming stage on cottonseed yield and nutritional quality

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The Crop Journal 2022年第1期10卷 128-139页

作者： Bingjie Xu Min Gao wei hu Wenqing Zhao Shanshan Wang Zhiguo Zhou Key Laboratory of Crop Growth Regulation Ministry of AgricultureNanjing Agricultural UniversityNanjing 210095JiangsuChina

As the main byproduct of cotton production,cottonseed yields edible vegetable oil,ruminant feed,and industrial *** evaluated the individual and interactive effects of elevated air temperature and soil drought on cottonseed yield and nutritional quality using two cotton cultivars,Sumian 15(heat-susceptible)and PHY370 WR(heat-tolerant).The experiment was conducted under three levels of soil relative water content(SRWC):(75±5)%,(60±5)%and(45±5)%and two temperature regimes:ambient temperature(AT,31.0/26.4℃,mean daytime/night temperature)and elevated temperature(ET,33.4/28.9℃).Cottonseed yield,boll number,seed number,and single-seed weight were lower under combined ET and SRWC(45±5)%than either individual stress or combined stresses in comparison with the control treatment(SRWC(75±5)%under AT).Drought tended to increase oil content and reduce protein content,whereas ET showed almost the opposite *** the combination of ET and soil drought,oil content was still higher than under control,although ET weakened the beneficial effects of *** protein,ET offset the negative impacts of mild drought on protein content,but protein content was not increased under SRWC(45±5)%.Each stress or combined stress reduced oil and protein yields under all treatments,owing to declines in cottonseed *** combined stress reduced unsaturated fatty acid(UFA)/saturated fatty acid(SFA)and essential amino acid(EAA)/non-essential amino acid(NAA).Compared with PHY370 WR,the sensitivity of Sumian 15 to the combined factors was evidenced in the following ways:(1)seed yield,yield components,oil and protein yields were decreased more for Sumian 15 than PHY370 WR compared with the control treatment;(2)the combined stresses caused lower oil content,UFA,and UFA/SFA in Sumian 15 than PHY370 WR;(3)interaction effects of the combined factors on protein content and EAA/NAA were detected only in Sumian 15.

关键词： Cottonseed Elevated temperature Drought Oil yield and quality Protein yield and quality

Deep learning-based method for detecting anomalies in electromagnetic environment situation

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Defence Technology（防务技术） 2023年第8期26卷 231-241页

作者： wei-lin hu Lun-wen Wang Chuang Peng Ran-gang Zhu Meng-bo Zhang College of Electronic Engineering National University of Defense TechnologyHefei230001China

The anomaly detection of electromagnetic environment situation(EMES) has essential reference value for electromagnetic equipment behavior cognition and battlefield threat *** this paper,we proposed a deep learning-based method for detecting anomalies in EMES to address the problem of relatively low efficiency of electromagnetic environment situation anomaly detection(EMES-AD).Firstly,the convolutional kernel extracts the static features of different regions of the ***,the dynamic features of the region are obtained by using a recurrent neural network(LSTM).Thirdly,the Spatio-temporal features of the region are recovered by using a de-convolutional network and then fused to predict the *** structural similarity algorithm(SSIM) is used to determine whether it is *** developed the detection framework,de-signed the network parameters,simulated the data sets containing different anomalous types of EMES,and carried out the detection *** experimental results show that the proposed method is effective.

关键词： Electromagnetic environment situation(EMES) Anomaly detection(AD) Regional features integration LSTM CNN