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A New Algorithm of Rain Type Classification for GPM Dual-Frequency Precipitation Radar in Summer Tibetan Plateau

Advances in Atmospheric Sciences 2024年第11期41卷 2093-2111页

作者： Yunfei FU liu YANG Zhenhao WU Peng ZHANG Songyan GU Lin CHEN Sun NAN School of Earth and Space Sciences CMA-USTC Laboratory of Fengyun Remote SensingUniversity of Science and Technology of ChinaHefei 230026China Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research Institute of Heavy RainChina Meteorological AdministrationWuhan 430205China National Satellite Meteorological Center China Meteorological AdministrationBeijing 100081China

In this study, a new rain type classification algorithm for the Dual-Frequency Precipitation Radar(DPR) suitable over the Tibetan Plateau(TP) was proposed by analyzing Global Precipitation Measurement(GPM) DPR Level-2 data in summer from 2014 to 2020. It was found that the DPR rain type classification algorithm(simply called DPR algorithm) has mis-identification problems in two aspects in summer TP. In the new algorithm of rain type classification in summer TP,four rain types are classified by using new thresholds, such as the maximum reflectivity factor, the difference between the maximum reflectivity factor and the background maximum reflectivity factor, and the echo top height. In the threshold of the maximum reflectivity factors, 30 d BZ and 18 d BZ are both thresholds to separate strong convective precipitation, weak convective precipitation and weak precipitation. The results illustrate obvious differences of radar reflectivity factor and vertical velocity among the three rain types in summer TP, such as the reflectivity factor of most strong convective precipitation distributes from 15 d BZ to near 35 d BZ from 4 km to 13 km, and increases almost linearly with the decrease in height. For most weak convective precipitation, the reflectivity factor distributes from 15 d BZ to 28 d BZ with the height from 4 km to 9 km. For weak precipitation, the reflectivity factor mainly distributes in range of 15–25 d BZ with height within 4–10 km. It is also shows that weak precipitation is the dominant rain type in summer TP, accounting for 40%–80%,followed by weak convective precipitation(25%–40%), and strong convective precipitation has the least proportion(less than 30%).

关键词： satellite precipitation radar rain type classification method Tibetan Plateau strong convective precipitation

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High recoverable energy density of Na_(0.5)Bi_(0.5)TiO_(3)-based ceramics by multi-scale insulation regulation and relaxor optimization strategy

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Journal of Materiomics 2024年第4期10卷 845-856页

作者： Qiuyu Zheng Bing Xie Yahui Tian Qi Wang Huajie Luo Zhiyong liu Haibo Zhang School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang330063China School of Information Engineering Jiangxi University of TechnologyNanchangJiangxi330098China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing100083China School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan430074China

Dielectric ceramic capacitors(DCCs)are highly desired for advanced electronic and electrical power systems owing to their ultrahigh power densities and fast charge-discharge ***,the low recoverable energy density(Wrec)of dielectric ceramic resulting from the low Weibull breakdown strength(Eb)has been a long-standing ***,we fabricated 0.8Na_(0.5)Bi_(0.5)TiO_(3)–0.2Sm_(1/3)Sr_(1/2)(Mg_(1/3)Nb_(2/3))O_(3)(0.8NBT–0.2SSMN)relaxor ferroelectric(RFE)ceramics display a greatly improved Eb of 480 kV/cm and largely enhanced Wrec of 7.3 J/cm3,far outperforming pure NBT *** demonstrate that the proposed multi-scale insulation regulation strategy via introducing SSMN with optimal content can effectively reduce grain sizes,increase the bandgap,and create a highly insulating second phase,leading to a high ***,the introduction of Sm^(3+)and Mg^(2+)–Nb5+dopants on the A/B-sites of the Na0.5Bi0.5TiO3 lattice created disruptions in the long-range-ordered ferroelectric domains,leading to excellent RFE *** high Eb and excellent RFE property led to the substantial improvement of ***,an exceptional thermal stability of Wrec and efficiency(η)are obtained at 25–200℃(Wrec∼(1.77±0.08)J/cm^(3),η∼82.9%±4.3%).This work offers a route for designing high energy storage performance relaxor ferroelectric ceramics for high-voltage dielectric ceramic capacitors.

关键词： Multi-scale insulation regulation Relaxor ferroelectrics Energy storage performance Thermal stability

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The protective effect of Limosilactobacillus reuteri against gestational diabetes mellitus through restoring intestinal microbiota homeostasis and attenuating inflammation in mice

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Food Science and Human Wellness 2024年

作者： Ce Qi Haowen Zhang Zhenli liu Xiaolin liu Lintao Zhang Liangliang You Jin Sun Institute of Nutrition and Health， Qingdao University QingDao Newhope QinPai Dairy Co.Ltd. Tai'an Maternal and Child Health Hospital Jiaozhou Maternity and Child Health and family Planning Service Center

Limosilactobacillus reuteri QS01 is potential probiotic isolated from the intestinal microbiota of healthy women in early pregnancy. In the current study， we examined whether QS01 can prevent gestational diabetes mellitus (GDM) in an enhanced mouse model of the condition. Female C57BL/6J mouse offspring (F1 generation) born to dams fed a control (CON) or low-protein diet (GDM group) during gestation and lactation were used. Pregnant F1 mice fed a standard diet were randomly assigned to 5 groups: CON， GDM， and GDM mice treated with metformin， QS01 or Lacticaseibacillus rhamnosus HN001. An oral glucose tolerance test was performed before sacrifice at gestational day 17. Glucose tolerance was significantly ameliorated by all three treatments. QS01 supplementation fortified the intestinal mucosal barrier and inhibited the escalation of plasma inflammatory cytokines. QS01 treatment altered the cecal microbiota composition and function. Plasma and cecal metabolite profiles were modulated by QS01， prominently demonstrating significant upregulation of indole lactate and L-tryptophan in plasma and 5-hydroxy-tryptophan in the cecum， positively correlated with gut Lactobacillus abundance. In summary， QS01 plays a role in preventing GDM by remodeling the intestinal microbiota， reinforcing the intestinal mucosal barrier and alleviating chronic inflammation.

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Transfer-based Approximate Dynamic Programmingfor Rolling Security-constrained Unit Commitment with Uncertainties

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Protection and Control of Modern Power Systems 2024年第5期9卷 42-53页

作者： Jianquan Zhu Kai Zeng Jiajun Chen Wenmeng Zhao Wenhao liu Wenkai Zhu School of Electric Power Engineering South China University of TechnologyGuangzhou 510640China Electric Power Research Institute China Southern Power GridGuangzhou 510700China

This paper studies the rolling security-constrained unit commitment(RSCUC)problem with AC power flow and *** this NP-hard problem,it is modeled as a Markov decision process,which is then solved by a transfer-based approximate dynamic programming(TADP)algorithm proposed in this *** from traditional approximate dynamic programming(ADP)algorithms,TADP can obtain the commitment states of most units in advance through a decision transfer technique,thus reducing the action space of TADP ***,compared with traditional ADP algorithms,which require to determine the commitment state of each unit,TADP only needs determine the unit with the smallest on-state probability among all on-state units,thus further reducing the action *** proposed algorithm can also prevent the iter-ative update of value functions and the reliance on rolling forecast information,which makes more sense in the rolling decision-making process of ***,nu-merical simulations are carried out on a modified IEEE 39-bus system and a real 2778-bus system to demonstrate the effectiveness of the proposed *** Terms-Rolling security-constrained unit com-mitment,approximate dynamic programming,decision transfer,probability-based decision priority criterion,uncertainty.

关键词： Rolling security-constrained unit com-mitment approximate dynamic programming decision transfer probability-based decision priority criterion uncertainty

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Network analysis of suicide ideation and depression-anxiety symptoms among Chinese adolescents

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General Psychiatry 2024年第2期37卷 216-223页

作者： Shuyin Xu Yumeng Ju Xiyu Wei Wenwen Ou Mohan Ma Guanyi Lv Xiaotian Zhao Yaqi Qin Yunjing Li Liang Li Mei Huang Siqi Yang Yimei Lu Yafei Chen Junwu liu Jin liu Bangshan liu Yan Zhang Department of Psychiatry National Clinical Research Center for Mental Disordersand National Center for Mental DisordersThe Second Xiangya Hospital of Central South UniversityChangshaHunanChina Mental Health Institute of Central South University China National Technology Institute on Mental DisordersHunan Technology Institute of PsychiatryHunan Key Laboratory of Psychiatry and Mental HealthHunan Medical Center for Mental HealthChangshaHunanChina

Background The co-occurrence of depression and anxiety among adolescents is typically associated with suicide *** The study aimed to investigate the symptom-level relationship between suicide ideation and the comorbidity of depression and *** 1501 adolescents aged 12-19 years were assessed using the Patient Health Questionnaire(PHQ-9)and the Generalized Anxiety Disorder Scale,and 716 adolescents who scored≥5 on both scales were selected as *** analysis was used to identify the network structure of depressive symptoms and anxiety *** were categorised into either the suicide ideation or non-suicide ideation groups based on their scoring on the suicide-related item in PHQ-9.A comparison was made between the depression-anxiety symptom networks of the two ***‘Restlessness’,‘sad mood’and‘trouble relaxing’were the most prominent central symptoms in the depression-anxiety symptom network,and‘restlessness’,‘nervousness’and‘reduced movement’were the bridge symptoms in this network.‘Sad mood’was found to be directly related to‘suicide ideation’with the highest *** network structure was significantly different in properties between the suicide ideation group and the non-suicide ideation group,with‘restlessness’and‘sad mood’exhibiting significantly higher influence in the network of the suicide ideation group than that in the non-suicide ideation *** Restlessness and sad mood could be targeted for the intervention of depression-anxiety symptoms among adolescents with suicide ideation.

关键词： symptoms adolescent assessed

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Material Composition of the Newly Discovered Zongzhuo Formation Sedimentary Mélange in Dingri Area, Southern Tibet, and its Constraints on the Basin Controlling Dingri-Gamba fault

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ACTA GEOLOGICA SINICA-ENGLISH EDITION 2024年第5期98卷 1171-1186页

作者： Yan, Songtao Ding, Ailing Dai, Xuejian Li, Hu liu, Tao Zhu, Lidong Wu, Qingsong China Geol Survey Civil Mil Integrat Ctr Chengdu 610036 Peoples R China Chengdu Univ Technol Coll Earth Sci Chengdu 610059 Peoples R China Chengdu Univ Informat Technol Sch Software Engn Chengdu 610225 Peoples R China Chengdu Univ Technol Inst Sedimentary Geol Chengdu 610059 Peoples R China

The study of sedimentary m & eacute;langes holds pivotal importance in understanding orogenic processes and unveiling geodynamic mechanisms. In this study, we present findings on zircon U-Pb isotopes and whole-rock elemental data concerning the recently uncovered Zongzhuo Formation sedimentary m & eacute;langes within the Dingri area. Field observations reveal the predominant composition of the Zongzhuo Formation, characterized by a matrix of sandstone-mudstone mixed with sand-conglomerates within native blocks exhibiting soft sediment deformation. Moreover, exotic blocks originating from littoral-neritic seas display evidence of landslide deformation. Our study identifies the depositional environment of the Zongzhuo Formation in Dingri as a slope turbidite fan, with its provenance traced back to the passive continental margin. Notably, this contrasts with the Zongzhuo Formation found in the Jiangzi-Langkazi area. Based on existing data, we conclude that the Zongzhuo Formation in the Dingri area was influenced by the Dingri-Gamba fault and emerged within a fault basin of the passive continental margin due to Neo-Tethys oceanic subduction during the Late Cretaceous period. Its provenance can be attributed to the littoral-neritic sea of the northern Tethys Himalaya region. This study holds significant implications for understanding the tectonic evolution of Tethys Himalaya and for reevaluating the activity of the Dingri-Gamba fault, as it controls the active deposition of the Zongzhuo Formation.

关键词： sedimentary m & eacute lange provenance analysis Zongzhuo Formation Dingri-Gamba fault Tethys Himalaya ZIRCON U-PB MELANGE-FORminG PROCESSES GANGDESE BATHOLITH TETHYAN HIMALAYA VOLCANIC-ROCKS LHASA TERRANE SUTURE ZONE ARC LEUKOGRANITES EVOLUTION

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Coordinated Voltage Control of Distribution Network ConsideringMultiple Types of Electric Vehicles

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Energy Engineering 2024年第2期121卷 377-404页

作者： Liang liu Guangda Xu Yuan Zhao Yi Lu Yu Li Jing Gao State Grid Jibei Electric Power Research Institute(North China Electric Power Research Institute Co. Ltd.)Beijing100045China

The couple between the power network and the transportation network(TN)is deepening gradually with the increasing penetration rate of electric vehicles(EV),which also poses a great challenge to the traditional voltage control *** this paper,we propose a coordinated voltage control strategy for the active distribution networks considering multiple types of *** the first stage,the action of on-load tap changer and capacitor banks,etc.,are determined by optimal power flow calculation,and the node electricity price is also determined based on dynamic time-of-use tariff *** the second stage,multiple operating scenarios of multiple types of EVs such as cabs,private cars and buses are considered,and the scheduling results of each EV are solved by building an optimization model based on constraints such as queuing theory,Floyd-Warshall algorithm and traffic flow *** the third stage,the output power of photovoltaic and energy storage systems is fine-tuned in the normal control *** charging power of EVs is also regulated in the emergency control mode to reduce the voltage deviation,and the amount of regulation is calculated based on the fair voltage control mode of ***,we test the modified IEEE 33-bus distribution system coupled with the 24-bus Beijing *** simulation results show that the proposed scheme can mitigate voltage violations well.

关键词： Electric vehicle transportation network voltage control queuing theory

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Temperature/electric field induced photoluminescence-modulation effect in dysprosium-doped barium titanate ferroelectric ceramics

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Journal of Materiomics 2024年第5期10卷 1117-1125页

作者： Lei Xia Xiao liu Zhan Mao Yanbin Cai Jing Zhu Jiyang Xie Wanbiao Hu Yunnan Key Laboratory of Electromagnetic Materials and Devices National Center for International Research on Photoelectric and Energy MaterialsSchool of Materials and EnergyYunnan UniversityKunming650091China Electron Microscopy Center Yunnan UniversityKunming650091China University of Science and Technology of China Hefei230026China

Lanthanide(Ln^(3+))based ferroelectric phosphors,with an integration of PL emission and ferroelectric effect,are unveiling an exciting realm of possibilities for multifunctional ferroelectric-optic ***,how the ferroelectric host enables the tuning on the PL emissions through modulating the local structure(e.g.,lattice site,symmetry,strains etc.)of the Ln^(3+)activator is not established *** this work,a luminescent-ferroelectric material,***^(3+)doped BaTiO_(3) ceramic(Ba_(1–x)Dy_(x)TiO_(3)(x=0–0.07),abbr:BTO:Dy^(3+)),was explored to address the aforementioned *** BTO:Dy^(3+)ceramics were synthesized by a solid-state reaction *** crystal structure,photoluminescence(PL)and electric properties(dielectric constant,ferroelectric hysteresis and piezoelectric hysteresis loop)were systematically *** BTO:Dy^(3+)ceramics show two predominant emission peaks,corresponding to the blue magnetic dipole transition(477 nm,4F_(7/2)→6H_(15/2))and yellow electric dipole transition(573 nm,4F_(7/2)→6H_(13/2)),the intensity ration of which can be modulated by the ferroelectric polarization that causes the slight lattice *** a polarization-emission modulation combining with the Dy3+doping could accelerate the color change,from yellow to blue,which is characterized to detect the phase transition,with a method and mechanism were proposed,that is,the phase change is reflected by the PL characteristic peak intensity ***,the current results offer a convenient photoluminescence method for detecting the ferroelectric phase transition and a feasible approach to study the interaction between the photoluminescence and polarization in ferroelectric materials,for providing new insights for the development of multifunctional materials.

关键词： Photoluminescence Barium titanate Modulation Ferroelectric ceramics

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蔗糖对植物分枝调控的研究进展

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农业生物技术学报 2024年第2期32卷 458-470页

作者：周慧文罗含敏熊发前高轶静刘菁阳太亿闫海锋丘立杭广西农业科学院甘蔗研究所/农业部甘蔗生物技术与遗传改良重点实验室/广西甘蔗遗传改良重点实验室

植物的分枝特性是重要的农艺性状，可影响植物的产量和价值。植物的分枝特性受多种因素共同影响，蔗糖是最近受关注最多的影响植物分枝特性的研究热点。蔗糖不仅可以作为碳源为植株的分枝生长提供能量，还是植物生长发育的重要信号分子... 详细信息

植物的分枝特性是重要的农艺性状，可影响植物的产量和价值。植物的分枝特性受多种因素共同影响，蔗糖是最近受关注最多的影响植物分枝特性的研究热点。蔗糖不仅可以作为碳源为植株的分枝生长提供能量，还是植物生长发育的重要信号分子。本综述归纳了蔗糖促进分枝的主要信号途径，其中，独脚金内酯、生长素和细胞分裂素是蔗糖促进分枝过程中最为重要的3类激素，TB1(teosinte branched 1)、BRC1(branched 1)等转录因子也发挥着重要作用。本文可为植物分枝理论和构建植物合理群体提供参考。

关键词：植物分枝蔗糖生长素细胞分裂素独脚金内酯

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Water and nitrogen footprint assessment of integrated agronomic practice management in a summer maize cropping system

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Journal of Integrative Agriculture 2024年第10期23卷 3610-3621页

作者： Ningning Yu Bingshuo Wang Baizhao Ren Bin Zhao Peng liu Jiwang Zhang State Key Laboratory of Crop Biology and College of Agronomy Shandong Agricultural UniversityTai’an 271018China

The footprints of water and nitrogen(WF and NF)provide a comprehensive overview of the type and quantity of water consumption and reactive nitrogen(Nr)loss in crop *** this study,a field experiment over two years(2019 and 2020)compared three integrated agronomic practice management(IAPM)systems:An improved management system(T2),a high-yield production system(T3),and an integrated soil-crop management system(ISCM)using a local smallholder farmer’s practice system(T1)as control,to investigate the responses of WF,Nr losses,water use efficiency(WUE),and nitrogen use efficiency(NUE)to *** results showed that IAPM optimized water distribution and promoted water use by summer *** evapotranspiration over the whole maize growth period of IAPM increased,but yield increased more,leading to a significant increase in *** WUE of the T2,T3,and ISCM treatments was significantly greater than in the T1 treatment,in 2019 and 2020respectively,by 19.8-21.5,31.8-40.6,and 34.4-44.6%.The lowest WF was found in the ISCM treatment,which was 31.0%lower than that of the T1 *** addition,the ISCM treatment optimized soil total nitrogen(TN)distribution and significantly increased TN in the cultivated *** nitrogen fertilizer was applied in treatment T3,producing the highest maize yield,and resulting in the highest Nr *** contrast,the ISCM treatment used a reduced nitrogen fertilizer rate,sacrificing grain yield partly,which reduced Nr losses and eventually led to a significant increase in nitrogen use efficiency and nitrogen *** Nr level in the ISCM treatment was34.8%lower than in the T1 treatment while NUE was significantly higher than in the T1 treatment by 56.8-63.1%in2019 and 2020,*** yield,WUE,NUE,WF,and NF together,ISCM should be used as a more sustainable and clean system for sustainable production of summer maize.

关键词： integrated agronomic practice management water footprints nitrogen footprints water use efficiency nitrogen use efficiency yield

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