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功能性镀锡层后处理技术

电镀与精饰 2024年第3期46卷 89-94页

作者：宋键万传云申熏上海应用技术大学化学与环境工程学院上海201418 无锡鼎亚电子材料有限公司江苏无锡214000

镀后处理是防止功能性镀锡层氧化变色、可焊性下降的有效手段。镀后热处理技术可以有效改善镀层的微观结构,而锡层表面的物理或化学处理可以有效保持镀层功能性,提高应用的可靠性。通过物理和化学两个角度对镀锡层的后处理技术进行了总... 详细信息

镀后处理是防止功能性镀锡层氧化变色、可焊性下降的有效手段。镀后热处理技术可以有效改善镀层的微观结构,而锡层表面的物理或化学处理可以有效保持镀层功能性,提高应用的可靠性。通过物理和化学两个角度对镀锡层的后处理技术进行了总结,并对后处理技术的发展进行了展望。

关键词：后处理镀锡可靠性热处理自组装

磁性金属吸波剂的高温氧化问题及其对策研究进展

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包装工程 2024年第7期45卷 234-245页

作者：管笑颂沈勋廖嘉伟中国人民解放军92574部队上海200436 中国人民解放军92728部队上海200436

目的针对磁性金属吸波剂由组成元素化学性质活泼导致的高温氧化和电磁性能恶化问题展开现状调研和讨论,解析磁性金属吸波剂高温氧化的机理,并提出相应的解决策略。方法从氧气在金属吸波剂中的吸附、反应和传质过程出发,讨论高温氧化对... 详细信息

目的针对磁性金属吸波剂由组成元素化学性质活泼导致的高温氧化和电磁性能恶化问题展开现状调研和讨论,解析磁性金属吸波剂高温氧化的机理,并提出相应的解决策略。方法从氧气在金属吸波剂中的吸附、反应和传质过程出发,讨论高温氧化对吸波剂电磁性能的影响规律,系统总结并评述表面包覆隔绝氧气、生成致密金属氧化膜和抑制氧原子扩散3种策略对吸波剂抗高温氧化的作用机制。结论表面包覆策略通过引入有机高分子、无机化合物或磁性金属等包覆物质,以隔绝氧气,从而抑制磁性金属吸波剂的高温氧化。其中,无机化合物包覆体系最具潜力,但尚未达到理想的超薄致密状态。生成致密氧化膜策略通过溶质元素的选择性氧化,形成保护膜,能够有效抑制氧化进程,但引入较高含量的非铁磁性溶质元素容易降低磁导率、恶化吸波性能。抑制氧原子扩散策略通过形成晶界氧化物来有效减缓氧化,目前其实现手段有限且不够成熟。在耐温磁性吸波剂的研制中应综合考虑使用温度、基体材料、目标吸波频段和期望吸波性能等,采用合适的抗氧化策略。

关键词：高温吸波涂层磁性吸波剂表面包覆致密氧化膜抑制扩散

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A survey on online learning and optimization for spark advance control of SI engines

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Science China(Information Sciences) 2018年第7期61卷 6-26页

作者： Yahui ZHANG xun shen Tielong shen Department of Engineering and Applied Sciences Sophia University

One of the most important factors affecting fuel efficiency and emissions of automotive engines is combustion quality that is usually controlled by managing spark advance(SA) in spark ignition(SI) *** increasing sensing capabilities and enhancements in on-board computation capability, online learning and optimization techniques have been the subject of significant research interest. This article surveys the literature of learning and optimization algorithms with applications to combustion quality optimization and control of SI engines. In particular, this paper reviews extremum seeking control algorithms for iterative solution of online optimization problems, stochastic threshold control algorithms for iterative solution of probability control of stochastic knock event, as well as feedforward learning algorithms for iterative solution of operating-point-dependent feedforward adaptation problems. Finally, two experimental case studies including knock probabilistic constrained optimal combustion control and on-board map learning-based combustion control are carried out on an SI gasoline engine.

关键词： online learning stochastic optimization iterative solution combustion control spark ignition engine

Logical control scheme with real-time statistical learning for residual gas fraction in IC engines

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Science China(Information Sciences) 2018年第1期61卷 45-57页

作者： xun shen Yuhu WU Tielong shen Department of Engineering and Applied Sciences Sophia University School of Control Science and Engineering Dalian University of Technology

In this paper, an optimal control scheme for reducing the fluctuation of residual gas fraction(RGF) under variational operating condition is developed by combining stochastic logical system approach with statistical learning method. The method estimating RGF from measured in-cylinder pressure is introduced firstly. Then, the stochastic properties of the RGF are analyzed according to statistical data captured by conducting experiments on a test bench equipped with a L4 internal combustion engine. The influences to the probability distribution of the RGF from both control input and environment parameters are also analyzed. Based on the statistical analysis, a stochastic logical transient model is adopted for describing cyclic behavior of the RGF. Optimal control policy maps for different fixed operating conditions are calculated then. Besides, a statistical learning-based method is applied to learn the probability density function(PDF)of RGF in the real-time which is used to adjust the control MAP based on logical optimization. The whole optimal control policy map is obtained based on Gaussian process regression with consideration of statistical information of RGF. Finally, the performance of the proposed method is experimentally validated.

关键词： combustion engine statistical learning residual gas fraction variable valve timing logical control

NUMERICAL SIMULATION OF 3-D TURBULENT FLOW IN THE MULTI-INTAKES SUMP OF THE PUMP STATION

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Journal of Hydrodynamics 2007年第1期19卷 42-47页

作者： CHEN Hong-xun shen Xin-rong Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

In this article, a numerical model forthree-dimensional turbulent flow in the sump of the pumpstation was presented. A reasonable boundary condition for the flow in the sump with several water intakes at different flowrates was proposed. The finite volume method was employed tosolve the governing equations with the body fitted gridgenerated by the multi-block grid technique. By using theFluent software, the fluid flow in a model sump of the pumpstation was calculated. Compared with the experimental result,the numerical result of the example is fairly good.

关键词： pumping station sump suction pipe turbulentmodel numerical simulation

不同因素对OSP用于镀锡板时保护效果的影响

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电镀与涂饰 2024年第9期43卷 60-68页

作者：周星辰宋键申熏万传云上海应用技术大学化学与环境工程学院上海201418 无锡鼎亚电子材料有限公司江苏无锡214000

[目的]以某市售有机可焊保护剂(OSP)为例,研究OSP在不同条件下对镀锡板的保护效果。[方法]通过中性盐雾试验、干/湿老化试验及可焊性测试,研究了镀锡板的基体材质、镍中间层的引入及其厚度、镀锡层的厚度及其种类对OSP保护效果的影响。... 详细信息

[目的]以某市售有机可焊保护剂(OSP)为例,研究OSP在不同条件下对镀锡板的保护效果。[方法]通过中性盐雾试验、干/湿老化试验及可焊性测试,研究了镀锡板的基体材质、镍中间层的引入及其厚度、镀锡层的厚度及其种类对OSP保护效果的影响。[结果]当镀锡板采用锡铜合金为基材、1~2μm厚的镍为中间层及2~3μm厚的雾锡为外层时,OSP展现出最佳的保护效果。[结论]本文的研究结果可为企业选择镀锡板防护技术提供实验数据和指导。

关键词：镀锡板有机可焊保护剂耐蚀性可焊性抗老化

Effects of the duration of expressions on the recognition of microexpressions

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第3期13卷 221-230页

作者： xun-bing shen Qi wu Xiao-lan FU State Key Laboratory of Brain and Cognitive Science Institute of Psychology Chinese Academy of Sciences Beijing 100101 China

Objective: The purpose of this study was to investigate the effects of the duration of expressions on the recognition of microexpressions, which are closely related to deception. Methods: In two experiments, participants were briefly (from 20 to 300 ms) shown one of six basic expressions and then were asked to identify the expression. Results: The results showed that the participants' performance in recognition of microexpressions increased with the duration of the expressions, reaching a turning point at 200 ms before levelling off. The results also indicated that practice could improve the participants' performance. Conclusions: The results of this study suggest that the proper upper limit of the duration of microexpressions might be around 1/5 of a second and confirmed that the ability to recognize microexpressions can be enhanced with practice.

关键词： Duration of expressions Microexpressions Microexpression training tool (METT)

Iron ores matching analysis and optimization for iron-making system by taking energy consumption,CO2 emission or cost minimization as the objective

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Science China(Technological Sciences) 2017年第11期60卷 1625-1637页

作者： shen xun CHEN LinGen XIA ShaoJun QIN XiaoYong XIE ZhiHui Institute of Thermal Science and Power Engineering Naval University of EngineeringWuhan 430033China Military Key Laboratory for Naval Ship Power Engineering Naval University of EngineeringWuhan 430033China College of Power Engineering Naval University of EngineeringWuhan 430033China

An optimization model for iron-making system covering sinter matching process to blast furnace process is established, in which the energy consumption, CO_2 emission and cost minimizations are taken as optimization objectives. Some key constraints are considered according to practical production experience in the modelling. The combination of linear programming(LP)and nonlinear programming(NLP) methods is applied. The optimal sinter matching scheme under given conditions and the optimization results for different objectives are obtained. Effects of sinter grade and basicity on all the optimal objectives and coke ratio in blast furnace process are analyzed, respectively. The results obtained indicate that compared with the initial values,the energy consumption/CO_2 emission of iron-making system decreases by 2.03% for objectives of energy consumption/CO_2 emission minimizations and 1.89% for the objective of cost minimization, the cost decreases by 17.88% and 18.13%, *** the three criteria decrease with the increasing lump usage, coal powder injection, blast temperature, and decreasing coke ratio for the iron-making system.

关键词： iron ore matching iron-making system minimum energy consumption minimum CO2 emission minimum cost performance optimization

Primary follicular lymphoma in the renal pelvis:A rare case report

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World Journal of Clinical Cases 2021年第21期9卷 6026-6031页

作者： xun-Ze shen Chen Lin Fang Liu PET/CT Center Shaoxing People's Hospital(Shaoxing HospitalZhejiang University School of Medicine)Shaoxing 312000Zhejiang ProvinceChina Department of Pathology Shaoxing People's Hospital(Shaoxing HospitalZhejiang University School of Medicine)Shaoxing 312000Zhejiang ProvinceChina

BACKGROUND Follicular lymphoma(FL)is more common in lymph nodes,while primary extranodal lymphomas are *** tract lymphoid neoplasms are extremely rare,accounting for less than 5%of all extranodal *** one case of FL from the renal pelvis has previously been *** SUMMARY A 70-year-old male patient with a history of esophageal cancer visited our hospital for follow-up *** computed tomography revealed a malignant mass in the right renal *** whole-body positron emission tomography/computed tomography showed a significant increase in fluorodeoxyglucose uptake of this soft tissue mass and no abnormal fluorodeoxyglucose uptake in the esophageal *** patient underwent radical resection of a malignant tumor in the right kidney,which was confirmed by postoperative pathology to be *** patient received no radiation or chemotherapy after surgery,and no recurrence of lymphoma or other malignant tumors was found at the 1-year *** Extranodal FL is more common in the skin and gastrointestinal tract but rarely occurs in the urinary *** is the second report of primary renal *** extranodal FL is expected to have a favorable prognosis and can be cured by local resection.

关键词： Lymphoma Follicular lymphoma Renal pelvis Imaging Resection Case report