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China Ocean Engineering 2022年第5期36卷 808-813页

作者： WU Xiao-yu du Zhong School of Science Beijing Forestry UniversityBeijing 100083China Department of Mathematics and Physics North China Electric Power UniversityBaoding 071003China

In this paper,we investigate a(3+1)-dimensional generalized variable-coefficient shallow water wave equation,which can be used to describe the flow below a pressure surface in oceanography and atmospheric *** the Kadomtsev−Petviashvili hierarchy reduction,we obtain the semi-rational solutions which describe the lumps and rogue waves interacting with the kink *** find that the lump appears from one kink soliton and fuses into the other on the x−y and x−t ***,on the x−z plane,the localized waves in the middle of the parallel kink solitons are in two forms:lumps and line rogue *** effects of the variable coefficients on the two forms are *** dispersion coefficient influences the speed of solitons,while the background coefficient influences the background’s height.

关键词： variable-coefficient shallow water wave equation lumps linear rogue waves Kadomtsev-Petviashvili hierarchy reduction

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硅藻定量分析在溺死诊断中的应用

法医学杂志 2022年第1期38卷 110-113,118页

作者：杜宇坤张天叶刘景建刘超康晓东郑冬云石河徐曲毅马开军赵建广州市刑事科学技术研究所法医病理学公安部重点实验室广东广州510442 南方医科大学法医学院广东广州510515 上海市公安局物证鉴定中心法医物证学现场应用技术公安部重点实验室上海市现场物证重点实验室上海200083 昆明医科大学法医学院云南昆明650500

目的对水中尸体硅藻检验案例进行回顾性分析,探讨硅藻定量分析在溺死诊断中的应用价值。方法收集水中尸体共490例,根据死因分为溺死组和死后入水组,采用微波消解-真空抽滤-自动扫描电子显微镜法对肺、肝、肾组织及水样进行硅藻定量分析... 详细信息

目的对水中尸体硅藻检验案例进行回顾性分析,探讨硅藻定量分析在溺死诊断中的应用价值。方法收集水中尸体共490例,根据死因分为溺死组和死后入水组,采用微波消解-真空抽滤-自动扫描电子显微镜法对肺、肝、肾组织及水样进行硅藻定量分析,并计算肺组织与水样硅藻含量的比值(CL/CD值)。结果溺死组肺、肝和肾组织同时检出的有400例(85.5%),肺、肝、肾组织和水样中硅藻含量分别为(113235.9±317868.1)、(26.7±75.6)、(23.3±52.2)和(12113.3±21760.0)个/10 g,硅藻种类数分别为(7.5±2.8)、(2.6±1.9)、(2.9±2.1)、(8.9±3.0)种。溺死组和死后入水组CL/CD值分别为(100.6±830.7)、(0.3±0.4)。结论硅藻定量分析可为溺死诊断提供支持性证据,引入CL/CD值这一参数进行分析,能更准确地作出溺死的诊断。

关键词：法医病理学溺死硅藻检验定量分析微波消解-真空抽滤-自动扫描电子显微镜法

Precise determination of the pole position of the exotic Z_(c)(3900)

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Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 84-90页

作者： yun-Hua Chen Meng-Lin du Feng-kun Guo School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China School of Physics University of Electronic Science and Technology of ChinaChengdu 611731China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China

We perform a unified description of the experimental data of the π^(+)π^(-)and J/ψπ^(±)invariant mass spectra for e^(+)e^(-)→J/ψπ^(+)π^(-)and the D^(0)D^(*-)mass spectrum for e^(+)e^(-)→D^(0)D^(*-)π^(+)at e^(+)e^(-)center-of-mass energies 4.23 and 4.26 *** analysis takes into account open-charm meson loops that contain triangle singularities,the J/ψπ-DD^(*)coupled-channel interaction respecting unitarity,and the strong ππ-KK final state interaction using dispersion *** analysis leads to a precise determination of the Z_(c)(3900)pole with the pole mass and width(3880.7±1.7_(stat)±22.4_(syst))MeV and(35.9±1.4_(stat)±15.3_(syst))MeV,respectively,and hints at that the DD^(*)molecular and non-molecular components are of similar importance in the Z_(c)(3900)formation.

关键词： exotic hadrons dispersion relations final state interaction triangle singularity

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微生物群落演替在死亡时间推断中的研究进展

法医学杂志 2023年第4期39卷 399-405页

作者：向青青陈立方苏秦杜宇坤梁沛妍康晓东石河徐曲毅赵建刘超陈晓晖昆明医科大学法医学院云南昆明650500 云南省公安厅刑事科学技术研究所云南昆明650228 广州市刑事科学技术研究所法医病理学公安部重点实验室广东广州510442 中山大学中山医学院法医学系广东广州510080 南方医科大学法医学院广东广州510515

死亡时间推断是法医学实践中的重点和难点,国内外法医学者一直在探寻客观、可量化和准确的死亡时间推断方法。随着高通量测序技术和人工智能技术的发展与结合,根据死后尸体相关的微生物群落演替规律建立死亡时间推断模型,成为法医学领... 详细信息

死亡时间推断是法医学实践中的重点和难点,国内外法医学者一直在探寻客观、可量化和准确的死亡时间推断方法。随着高通量测序技术和人工智能技术的发展与结合,根据死后尸体相关的微生物群落演替规律建立死亡时间推断模型,成为法医学领域的研究热点。本文就利用高通量测序技术探究微生物群落在死亡时间推断中的技术方法、研究应用及影响因素等方面进行综述,为利用微生物群落推断死亡时间的相关研究提供参考。

关键词：法医病理学微生物组学死亡时间推断微生物群落高通量测序机器学习综述

Entropy-driven self-assembly of chiral nematic liquid crystalline phases of AgNR@Cu20 hyper branched coaxial nanorods and thickness-dependent handedness transition

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Nano Research 2018年第2期11卷 1018-1028页

作者： Guiqing Cheng yu Wang kun Liu Jihong yu State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun China State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun China

The chiral nematic liquid crystalline phase （CNLCP） of noble metal nanorods induces a strong chiroptical response due to their intrinsic physical and chemical properties. Here, we demonstrate that the formation of CNLCP of Ag nanorods （AgNRs） originates from their bent-shape and is the result of purely entropic effects. The chirality of the liquid crystalline phase of AgNR@Cu20 hyper branched coaxial nanorods （HBCNRs） can be switched from left-handed to right-handed by increasing Cu20 thickness. It is proposed that the increase of coating thickness decreases the curvature of nanorods, which induces variation of the twist constant （/〈2） and bend elastic constant （K3）. The increased thickness also changes the direction of director with respect to the helical axis. In addition, hydrogen bonds can break the CNLCP, which can be attributed to their stronger effection compared to van der Waals forces and electrostatic interactions. In contrast to the variation of coating thickness, the surface morpholog~ constituents of the hybrid building blocks and polarity of the solvents do not play important roles in the handedness transition of the liquid crystalline phase. Furthermore, the results presented here give insight into the structure-property relationship and our strategy provides guidance for the synthesis of other inorganic chiral suDrastructures driven bv entroDic effects.

关键词： chirality circular dichroism Ag nanorod(AgNR)@Cu2O liquid crystals chiroptical response

Global research status and trends of somatic symptom disorder: A bibliometric study

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World Journal of Psychiatry 2025年第1期15卷 168-178页

作者： Chao Yang kun Zhang Qian Wang Shuai Wang Huan Li Kai Zhang Department of Psychiatry Beijing Luhe HospitalCapital Medical UniversityBeijing 100001China Department of Psychiatry Chaohu Hospital of Anhui Medical UniversityHefei 238000Anhui ProvinceChina School of Medicine Jiangxi University of TechnologyNanchang 510001Jiangxi ProvinceChina School of Public Health Zhejiang University School of MedicineHangzhou 310000Zhejiang ProvinceChina

BACKGROUND With the growing scholarly and clinical fascination with somatic symptom dis-order(SSD),a bibliometric analysis is *** To conduct a bibliometric analysis to investigate the current status and frontiers of *** The documents related to SSD are obtained from the web of science core collection database(WoSCC),and VOSviewer 1.6.16 from January 1,2000 to December 31,2023,and the WoSCC’s literature analysis wire were used to conduct the biblio-metric *** A total of 567 documents related to SSD were included,and 2325 authors across 947 institutions from 57 countries/regions have contributed to SSD research,published in 277 *** most productive author,institution,country and journal were Löwe B,University of Hamburg,Germany,and Journal of Psycho-somatic Research *** first high-cited document was published in the Journal of Psychosomatic Research in 2013 by Dimsdale JE and colleagues,which explored the rationale behind the SSD diagnosis introduction in diagnostic and statistical manual of mental *** In conclusion,the main research hotspots and frontiers in the field of SSD are validity and reliability of the SSD criteria,functional impairment of SSD,and the treatment for *** high-quality studies are needed to assess the diagnosis and treatment of SSD.

关键词： Somatic symptom disorder Validity and reliability Functional impairment Treatment Bibliometric analysis

Comparative study on pyrolysis of bamboo in microwave pyrolysis-reforming reaction by binary compound impregnation and chemical liquid deposition modified HZSM-5

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Journal of Environmental Sciences 2020年第8期32卷 186-196页

作者： Haoran du Zhaoping Zhong Bo Zhang kun Shi Zhaoying Li Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast UniversityJiangsu 210096China

The deactivation of catalyst is a significant reason for its limited application during the catalytic fast pyrolysis(CFP)*** reduce the coke formation,binary compound impregnation(BCI)and chemical liquid deposition(CLD)were used to modify HZSM-5 *** the same time,the self-designed microwave reactor separated the pyrolysis of bamboo and catalytic upgrading of primary vapor,which made the catalytic effect more *** results indicated that CLD used TiO 2 deposition to cover external acid sites,while BCI by phosphorus-nickel could cover and partly destroy superficial acid sites through two different *** the scope of the loaded amount studied,the yield of aromatic hydrocarbons in the oil phase increased at first and then decreased,while the coke formation reduced ***(benzene,toluene and xylene),the most valuable product in bio-oil,drastically increased by 39.1%and 22.6%respectively over the CLD and BCI modified *** the catalytic performance as well as cost,CLD over HZSM-5 has more advantages in the CFP process to upgrade bio-oil.

关键词： Bamboo Modified HZSM-5 Microwave Binary compound impregnation Chemical liquid deposition

Enhanced electrochemical CO_(2)reduction coupled with urea oxidation using bifunctional atomically dispersed CuNi catalysts

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Nano Research 2025年第1期18卷 208-216页

作者： Wenjie Wu Haoyang Zhou Ying Liu Yifei Pan Qingqing Chen yu Zhang Junjie Mao Wenjie Ma Ping yu Beijing National Laboratory for Molecular Sciences Key Laboratory of Analytical Chemistry for Living BiosystemsInstitute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China College of Chemistry and Materials Science Anhui Normal UniversityWuhu 241002China University of Chinese Academy of Sciences Beijing 100049China

The electrochemical conversion of carbon dioxide(CO_(2))into chemical fuels represents a promising approach for addressing global carbon balance ***,this process is hindered by the kinetic limitations of anodic reactions,usually the oxygen evolution reaction,resulting in less efficient production of high value-added ***,we report an integrated electrocatalytic system that couples CO_(2)reduction reaction(CO_(2)RR)with urea oxidation reaction(UOR)using a bifunctional electrocatalyst with atomically dispersed dual-metal CuNi sites anchored on bamboo-like nitrogen-doped carbon nanotubes(CuNi-CNT),which were synthesized through a one-step pyrolysis *** bifunctional CuNi-CNT catalyst exhibits a near 100%CO Faraday efficiency for CO_(2)RR over a wide potential range and outstanding UOR performance with a negatively shifted potential of 210 mV at 10 mA·cm^(-2).In addition,we assemble a two-electrode electrolyzer using bifunctional CuNi-CNT-modified carbon fiber paper electrodes as both cathode and anode,capable of operating at a remarkably low cell voltage of 1.81 V at 10 mA·cm-2,significantly lower than conventional *** study provides a novel avenue to achieving an efficient carbon cycle with reduced electric power consumption.

关键词： electrochemical conversion bimetallic site catalyst bifunctional electrocatalyst carbon dioxide reduction urea oxidation

Contrastive Self-supervised Representation Learning Using Synthetic Data

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International Journal of Automation and computing 2021年第4期18卷 556-567页

作者： Dong-yu She kun Xu Beijing National Research Center for Information Science and Technology Department of Computer Science and TechnologyTsinghua UniversityBeijing 100084China

Learning discriminative representations with deep neural networks often relies on massive labeled data, which is expensive and difficult to obtain in many real scenarios. As an alternative, self-supervised learning that leverages input itself as supervision is strongly preferred for its soaring performance on visual representation learning. This paper introduces a contrastive self-supervised framework for learning generalizable representations on the synthetic data that can be obtained easily with complete ***, we propose to optimize a contrastive learning task and a physical property prediction task simultaneously. Given the synthetic scene, the first task aims to maximize agreement between a pair of synthetic images generated by our proposed view sampling module, while the second task aims to predict three physical property maps, i.e., depth, instance contour maps, and surface normal maps. In addition, a feature-level domain adaptation technique with adversarial training is applied to reduce the domain difference between the realistic and the synthetic data. Experiments demonstrate that our proposed method achieves state-of-the-art performance on several visual recognition datasets.

关键词： Self-supervised learning contrastive learning synthetic image convolutional neural network representation learning

Experimental Study on the Overall Cooling Effectiveness of Effusion-Cooling Ceramic Matrix Composite Platform

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Journal of Thermal Science 2023年第3期32卷 1034-1048页

作者： du kun CHEN Qihao HUANG Xiaoyang LIANG Tingrui LIU Cunliang School Power and Energy Northwestern Polytechnical UniversityXi'an 710072China Yangtze River Delta Research Institute of NPU Northwestern Polytechnical UniversityTaicang 215400China Shaanxi Key Laboratory of Thermal Sciences in Aero-Engine System Northwestern Polytechnical UniversityXi'an 710129China NPU-KAI International Joint Laboratory of Advanced Aero-Engine Thermal Structure Northwestern Polytechnical UniversityXi'an 710129China AECC Sichuan Gas Turbine Establishment Chengdu 610500China

Ceramic matrix composite(CMC),with higher thermal limit and lower density relative to the superalloy,is regarded as the most important structural material for modern gas turbine ***,the anisotropic thermal conductivities caused by the weave patterns totally change the thermal conduction performance inside the solid ***,the present study aims to use the infrared thermographic to measure the SiC/SiC composite platform with staggered effusion holes along with the superalloy *** platform is prepared by 2-D plain weave braid structure with chemical vapor infiltration(CVI)*** temperature of mainstream is 900 K to match the real mainstream to coolant temperature ratio(T_(g)/T_(c)=1.5,2.1).The experimental was conducted with seven mass flow ratios(MFR=1.5%-4.5%).The results indicate that the thermal conductivity along the thickness direction is of great importance for the CMC *** superalloy platform obtains higher level of overall cooling effectiveness than CMC at T_(g)/T_(c)=***,the CMC platform achieves greater overall cooling effectiveness relative to superalloy at T_(g)/T_(c)=*** addition,CMC platform presents enhanced uniformity of overall cooling effectiveness due to the larger in-plane thermal conductivity.

关键词： conjugate heat transfer effusion cooling ceramic matrix composite temperature ratio