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建筑工程计量与计价课程思政AEE模式探究

云南开放大学学报 2024年第1期26卷 65-69页

作者：何芳张秋影沈建薇云南开放大学云南昆明650500

建筑工程计量与计价课程是建筑工程技术专业必修的主干专业理论课程,如何在课程教学中进行思政教育,既是当前建筑专业教师面临课程改革的一个重要任务,也是实现全方位全方面全过程推进建筑专业青年大学生思想政治工作的有效路径。在对... 详细信息

建筑工程计量与计价课程是建筑工程技术专业必修的主干专业理论课程,如何在课程教学中进行思政教育,既是当前建筑专业教师面临课程改革的一个重要任务,也是实现全方位全方面全过程推进建筑专业青年大学生思想政治工作的有效路径。在对建筑工程计量与计价课程思政的重要意义和目前存在的主要问题进行了分析的基础上,创造性和针对性地提出了建筑工程计量与计价课程思政的AEE模式,并以其中的思政元素挖掘、思政课程设计两个阶段为研究重点,提出了以启发式融入、讨论式发散、案例式体验和任务式驱动组成的AEE模式的实践路径。

关键词：建筑工程计量与计价课程思政元素挖掘课程设计 AEE模式

大闸蟹中二噁英类化合物污染情况及污染来源探究

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实验室检测

实验室检测 2024年第3期2卷 104-111页

作者：王红葛家春胡国绅余可垚田间陈晓玟侯燕沈伟健南京海关动植物与食品检测中心南京210019 江苏省淡水水产研究所南京210017

目的对江苏省内主要养殖地区的大闸蟹中二噁英类化合物进行了分析测定,并对造成大闸蟹二噁英类化合物暴露的主要污染来源进行了分析。方法采用气相色谱-高分辨磁质谱联用仪对各地区大闸蟹的蟹肉、蟹黄以及养殖底泥、养殖用水、水草、配... 详细信息

目的对江苏省内主要养殖地区的大闸蟹中二噁英类化合物进行了分析测定,并对造成大闸蟹二噁英类化合物暴露的主要污染来源进行了分析。方法采用气相色谱-高分辨磁质谱联用仪对各地区大闸蟹的蟹肉、蟹黄以及养殖底泥、养殖用水、水草、配合饲料、化学药品等中的二噁英及二噁英类多氯联苯分别进行测定。结果各地区蟹肉中二噁英总毒性当量浓度(TEQ)在0.0537~0.301 pg/g之间,二噁英类多氯联苯的毒性当量浓度在0.0122~0.0441 pg/g之间;蟹黄中二噁英的毒性当量浓度在1.14~3.43 pg/g之间,二噁英类多氯联苯的毒性当量浓度在0.827~1.99 pg/g之间。二噁英及二噁英类多氯联苯各异构体对大闸蟹的总毒性当量贡献各不相同,对PCDD/Fs总毒性当量浓度的贡献最高的是1,2,3,7,8-PeCDD,其对蟹肉、蟹黄贡献率分别为49.4%和34.3%;而对DL-PCBs总毒性当量浓度的贡献率最高的均为PCB-126,其对蟹肉、蟹黄贡献率分别为83.5%、87.5%。结论通过对大闸蟹二噁英类化合物污染来源进行分析,得到底泥是造成大闸蟹二噁英污染的主要来源。

关键词：大闸蟹二噁英污染毒性当量来源

Study of primordial deuterium abundance in Big Bang nucleosynthesis

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Nuclear Science and Techniques 2024年第3期35卷 208-215页

作者： Zhi-Lin shen jian-Jun He Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China

Big Bang nucleosynthesis(BBN)theory predicts the primordial abundances of the light elements^(2) H(referred to as deuterium,or D for short),^(3)He,^(4)He,and^(7) Li produced in the early *** these,deuterium,the first nuclide produced by BBN,is a key primordial material for subsequent *** date,the uncertainty in predicted deuterium abundance(D/H)remains larger than the observational *** this study,the Monte Carlo simulation code PRIMAT was used to investigate the sensitivity of 11 important BBN reactions to deuterium *** found that the reaction rate uncertainties of the four reactions d(d,n)^(3)He,d(d,p)t,d(p,γ)^(3)He,and p(n,γ)d had the largest influence on the calculated D/H ***,the calculated D/H uncertainty cannot reach observational precision even with the recent LUNA precise d(p,γ)^(3) He *** the nuclear physics aspect,there is still room to largely reduce the reaction-rate uncertainties;hence,further measurements of the important reactions involved in BBN are still necessary.A photodisintegration experiment will be conducted at the Shanghai Laser Electron Gamma Source Facility to precisely study the deuterium production reaction of p(n,γ)d.

关键词： Big Bang nucleosynthesis Abundance of deuterium Reaction cross section Reaction rate Monte Carlo method

Task-specific Part Discovery for Fine-grained Few-shot Classification

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Machine Intelligence Research 2024年第5期21卷 954-965页

作者： Yongxian wei Xiu-shen wei School of Computer Science and Technology Nanjing University of Science and TechnologyNanjing210094China

Localizing discriminative object parts(e.g.,bird head)is crucial for fine-grained classification tasks,especially for the more challenging fine-grained few-shot *** work always relies on the learned object parts in a unified manner,where they attend the same object parts(even with common attention weights)for different few-shot episodic *** this paper,we propose that it should adaptively capture the task-specific object parts that require attention for each few-shot task,since the parts that can distinguish different tasks are naturally *** for a few-shot task,after obtaining part-level deep features,we learn a task-specific part-based dictionary for both aligning and reweighting part features in an ***,part-level categorical prototypes are generated based on the part features of support data,which are later employed by calculating distances to classify query data for *** retain the discriminative ability of the part-level representations(i.e.,part features and part prototypes),we design an optimal transport solution that also utilizes query data in a transductive way to optimize the aforementioned distance calculation for the final *** experiments on five fine-grained benchmarks show the superiority of our method,especially for the 1-shot setting,gaining 0.12%,8.56%and 5.87%improvements over state-of-the-art methods on CUB,Stanford Dogs,and Stanford Cars,respectively.

关键词： Fine-grained image recognition few-shot learning transductive learning visual dictionary part feature discovery

Highly Accurate Golden Section Search Algorithms and Fictitious Time Integration Method for Solving Nonlinear Eigenvalue Problems

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 1317-1335页

作者： Chein-Shan Liu jian-Hung shen Chung-Lun Kuo Yung-wei Chen Center of Excellence for Ocean Engineering Taiwan Ocean UniversityKeelung202301TaiwanChina Department of Marine Engineering Taiwan Ocean UniversityKeelung202301TaiwanChina

This study sets up two new merit functions,which are minimized for the detection of real eigenvalue and complex eigenvalue to address nonlinear eigenvalue *** each eigen-parameter the vector variable is solved from a nonhomogeneous linear system obtained by reducing the number of eigen-equation one less,where one of the nonzero components of the eigenvector is normalized to the unit and moves the column containing that component to the right-hand side as a nonzero input vector.1D and 2D golden section search algorithms are employed to minimize the merit functions to locate real and complex ***,the real and complex eigenvectors can be computed very accurately.A simpler approach to the nonlinear eigenvalue problems is proposed,which implements a normalization condition for the uniqueness of the eigenvector into the eigenequation *** real eigenvalues can be computed by the fictitious time integration method(FTIM),which saves computational costs compared to the one-dimensional golden section search algorithm(1D GSSA).The simpler method is also combined with the Newton iterationmethod,which is convergent very *** the proposed methods are easily programmed to compute the eigenvalue and eigenvector with high accuracy and efficiency.

关键词： Nonlinear eigenvalue problem quadratic eigenvalue problem two new merit functions golden section search algorithm fictitious time integration method

Effect of heat treatment on microstructural evolution,mechanical properties and tribological properties of H13 steel prepared using selective laser melting

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Journal of Iron and Steel Research International 2024年第5期31卷 1246-1259页

作者： Li-xiong Han Yan Wang Shi-feng Liu Zhao-hui Zhang wei Liu Xin Yang Dang-shen Ma jian Zhou Ying-kang wei College of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina Zhejiang University City College Hangzhou310015ZhejiangChina China Iron and Steel Research Institute Group Co. Ltd.Beijing100081China

H13 tool steel was successfully prepared by selective laser melting(SLM)*** effects of heat treatment on the microstructure,mechanical properties,and tribological properties of SLMed H13 steel were *** heat treatment process involved a solution treatment and a double aging treatment of the deposited H13 tool steel prepared by *** aim is to optimize the microstructure and mechanical properties of SLMed H13 *** to the rapid heating and cooling effects of SLM,carbide precipitation in the deposited H13 steel was not uniform and residual stresses were *** purpose of the solution treatment is to dissolve the solution at a high temperature to eliminate the residual stresses and defects introduced by the SLM-forming *** solution treatment and first aging treatment produced the precipitation of small carbides at the grain boundaries and inside the crystals,which increased the hardness of SLMed H13 *** hardness increased from 538±4.0 HV of the as-deposited sample to 548±5.8 HV of samples after the first aging ***,the ultimate tensile strength and the elongation at break decreased from 1882 MPa and 11.5%in the as-deposited sample to 1697 MPa and 7.9%in those after the first aging treatment,***,the friction coefficient and wear rate in the as-deposited sample decreased from 0.5160 and 2.36×10^(–6)mm^(−3)N^(−1)m^(−1)to 0.4244 and 1.04×10^(–6)mm^(−3)N^(−1)m^(−1),***,the distribution of carbides inside the crystals was not *** second aging treatment adjusted the morphology of carbide precipitation and made it more uniform,but the precipitation of carbides grew and settled at the bottom of the grain *** hardness decreased to 533±6.7 HV compared with that with the first aging treatment,but the ultimate tensile strength and plasticity reached a balance(1807 MPa,14.05%).Accordingly,the friction coefficient and wear rate also showed a stable and decreasin

关键词： Selective laser melting H13 steel Solution aging Double aging Friction and wear Retained austenite

Percutaneous drug-eluting stent implantation in dextrocardia:case report

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Chinese Medical Journal 2007年第3期120卷 248-250页

作者： ZHANG Qi ZHANG Rui-yan HU jian shen wei-feng Department of Cardiology Shanghai Ruijin Hospital Medical School of Shanghai Jiaotong Unisersity Shanghai 200025 China

Although situs inversus with dextrocardia is a rare clinical phenomenon, the association with coronary artery disease（CAD） is at the same frequency as in the general popuLation. Few cases of dextrocardia complicated with CAD was reported before. The feasibility and prognosis of percutaneous coronary intervention （PCI） in such case still remains unclear because of the uncommon anatomical abnormality, especially in the drug-eluting stent （DES） era. Here we report a female case with dextrocardia and CAD was successfully treated by DES implantation.

关键词： dextrocardia coronary stent

Controls on reservoir quality in the paleogene Kalatar Formation of the southwestern region of the Tarim Basin,China

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Petroleum Science 2011年第3期8卷 302-315页

作者： Yang Haijun shen jian-wei Wang Xu Zhang Lijuan Li Meng Key Laboratory of Marginal Sea Geology of CAS South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Exploration and Development Research Institute Tarim Oilfield Company Petroleum Company Limited Korla 841000 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China

The Paleogene Kalatar Formation is a main target for petroleum ex125 ploration in the southwestern region of the Tarim Basin （SWRTB） and a systematical summary of controls on reservoirs of high quality has important implications for this area. According to outcrop analysis, as well as core, and laboratory experiments based on theories of sedimentology, it can be inferred that the main pore types in the Kalatar Formation are moldic, vuggy, intercrystalline and interparticle pores, fractures, and mudstone microporosity, respectively. The foreshore in the shore-shelf depositional model is the most favorable target, wherein grainstone and dolomitized grainstone are characterized by high quality in a middle ramp subfacies of the carbonate ramp model. Diagenetic factors, such as micritization, cementation, compaction, neomorphism, silicification, and pyritization, are detrimental for reservoirs. At the same time, leaching and dolomitization can improve the quality of reservoirs. Permeability of reservoirs can be greatly improved by fractures, through which quality of reservoirs can be effectively enhanced. Concentration of CO2, temperature, and humidity are affected by changes in climate, which can have an influence on depositional setting, composition and diagenesis of sediments, and eventually the properties of reservoirs. The hot and arid climate of the Paleogene was harmful to development of reservoirs, which is demonstrated in the contemporaneous diagenetic and epigenetic stages. Shallow and deep-burial diagenesis are closely related to the formation and the connate water, however these are rarely affected by paleo-climatic variation. There is possible erosion that mainly resulted from organic acid in relative well intervals according to indications of hydrocarbons in the early diagenetic stage. Fracture systems can be established when acidic fluids are ernplaced during periods of uplift, by which pores can be effectively enlarged during the late diagenetic stages.

关键词： Kalatar Formation sedimentary facies diagenesis dolomitization fractures climaticconditions Tarirn Basin

Wireless multisite sensing systems for continuous physiological monitoring

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Science China Materials 2024年第6期67卷 2045-2047页

作者： Ruilai wei Qilin Hua Guozhen shen School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China Institute of Flexible Electronics Beijing Institute of TechnologyBeijing 102488China

Respiratory diseases rank as the third leading cause of adult mortality[1],while cardiopulmonary and gastrointestinal issues are the primary cause of death within the first five years of a child’s life[2].The monitoring of cardiac,respiratory,and gastrointestinal sounds plays a vital role in routine care,as alterations or absence of these body sounds can serve as indicators of underlying diseases.

关键词： routine continuous monitoring