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舰船舱室环境油雾在金属和织物表面的沉降特性

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中国舰船研究 2024年第2期19卷 90-97页

作者：王志远余涛荆雷鸣林本成周爱民冷文军刘聪东南大学能源与环境学院江苏南京210096 武汉第二船舶设计研究所湖北武汉430205 北京航空航天大学能源与动力工程学院北京100191 中国人民解放军92330部队山东青岛266102 军事科学院军事医学研究院环境医学与作业医学研究所天津300050

[目的]旨在研究舰船舱室环境油雾在金属和织物表面的沉降特性。[方法]在试验舱内释油雾,让其在目标表面上沉降,称量表面沉降前后的质量差即为表面上的沉降质量,以此来对比不同朝向、不同材质表面的沉降特性;将水平向下表面的沉降合理假... 详细信息

[目的]旨在研究舰船舱室环境油雾在金属和织物表面的沉降特性。[方法]在试验舱内释油雾,让其在目标表面上沉降,称量表面沉降前后的质量差即为表面上的沉降质量,以此来对比不同朝向、不同材质表面的沉降特性;将水平向下表面的沉降合理假设为气相沉降,估算其贡献大小,并计算颗粒相的沉降速度。[结果]在朝向方面,金属水平向上表面的沉降质量分别是竖直和水平向下表面的3.98倍和4.66倍,织物水平向上表面的油雾沉降质量是竖直和水平向下表面的1.08倍和1.20倍;在材质方面,织物水平向上、竖直和水平向下表面的沉降质量分别是同朝向的金属表面的49.1倍、169.8倍和155.5倍。估算表明,对于金属水平向上和竖直表面,气相沉积的贡献分别为21.5%和79.2%;对于织物的水平向上和竖直表面,则约为90%。[结论]研究表明,舰船舱室环境油雾在织物表面的沉降远强于在金属表面的沉降;在金属水平向上表面的沉降远大于竖直表面和水平向下表面;在3种朝向的织物表面的沉降差别并不明显;无论何种材质和朝向,气相沉降都不可忽视。对于舰船舱室环境,气相沉降占据主导作用。

关键词：舰船舱室环境油雾金属表面织物表面沉降速度

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超声引导下经皮肾穿刺活检在糖尿病患者肾病诊断中的临床价值及安全性分析

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临床超声医学杂志 2024年第5期26卷 420-424页

作者：王菁童玉娜全大勇成都市第三人民医院超声医学科 610000

目的探讨超声引导下经皮肾穿刺活检在糖尿病患者肾病诊断中的临床价值,并对其安全性进行分析。方法选取在我院行超声引导下经皮肾穿刺活检的130例糖尿病患者,观察其穿刺及取材情况,并统计肾病患病情况及肾病分类;根据术后72 h是否发... 详细信息

目的探讨超声引导下经皮肾穿刺活检在糖尿病患者肾病诊断中的临床价值,并对其安全性进行分析。方法选取在我院行超声引导下经皮肾穿刺活检的130例糖尿病患者,观察其穿刺及取材情况,并统计肾病患病情况及肾病分类;根据术后72 h是否发生并发症将患者分为并发症组和无并发症组,比较两组性别、年龄、穿刺次数、术前血肌酐水平、肾实质厚度的差异;应用多因素Logistic回归分析术后并发症发生的独立影响因素。结果 130例糖尿病患者均穿刺成功,每例患者穿刺次数为2~4次,平均(2.86±0.33)次;所有患者均取得足量肾小球,每例患者21~41个,平均(30.71±4.75)个,取材成功率达100%;其中92例检出肾病,患病率为70.77%(92/130),包括糖尿病肾病61例(46.92%)和非糖尿病肾病31例(23.85%),非糖尿病肾病中IgA肾病17例,膜性肾病8例,系膜性肾小球肾炎、淀粉样变性、微型多动脉炎各2例。术后并发症组41例,包括肉眼血尿13例和肾周血肿28例(小血肿23例,大血肿5例),总发生率为31.54%(41/130)。并发症组年龄≥60岁、肾实质厚度70μmol/L占比均较无并发症组高,差异均有统计学意义(均P70μmol/L均为术后并发症发生的独立危险因素(OR=3.310、4.245、4.738、3.653,均P70μmol/L均为术后并发症发生的独立危险因素,临床应加强对上述因素的关注,提升其安全性。

关键词：超声引导经皮肾穿刺活检糖尿病肾病安全性

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新能源车用高性能钕铁硼磁铁极端工况条件下磁性能经时变化的研究

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稀土 2024年第3期45卷 49-57,I0004页

作者：丁开鸿夏元刚田俊虎赵明静秦伟翔李光辉烟台东星磁性材料股份有限公司山东烟台265500 包头稀土研究院内蒙古包头014030

通过冷热冲击试验、高温存储试验、高温高湿试验、高压加速寿命试验,研究了新能源车用高性能钕铁硼磁铁极端工况条件下的磁性能经时变化。研究表明,高性能钕铁硼磁铁在良好的涂层防护条件下,磁性能的变化主要受高温影响,磁铁的设计最高... 详细信息

通过冷热冲击试验、高温存储试验、高温高湿试验、高压加速寿命试验,研究了新能源车用高性能钕铁硼磁铁极端工况条件下的磁性能经时变化。研究表明,高性能钕铁硼磁铁在良好的涂层防护条件下,磁性能的变化主要受高温影响,磁铁的设计最高工作温度高于实际工作温度时,经历长期的极端工况,磁铁不可逆磁损低于1%,此结果有助于后续开展高性能钕铁硼的服役性能评价,对完善钕铁硼的评价标准起到积极的促进作用。

关键词：新能源车高性能钕铁硼极端工况磁性能变化评价方法

Efficient production of ultracold polar molecules^(23)Na^(40)K in their absolute ground state via intermediate state of the coupled complex B^(1)Π|ν=4〉^(c)^(3)Σ^(+)|ν=25〉

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中国科学:物理学、力学、天文学英文版 2023年第9期66卷 42-49页

作者： Zi-Liang Li Zheng-yu Gu Peng-Jun Wang jing Zhang State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-electronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

We report on the efficient creation of a sample of 2.2×10^(4)fermionic polar molecules^(23)Na^(40)K in their rovibrational ground state X^(1)∑^(+)|v=0,J=0>at 247 nK via an intermediate state of the spin-orbit coupled complex B^(1)Π|v=4〉~C^(3)∑^(+)|v=25〉.Compared with the intermediate state of the coupled complex B^(1)Π|v=12〉^(c)^(3)∑^(+)|v=35〉,this intermediate state has the larger Franck-Condon factors for up-and down-leg coupling of stimulated Raman adiabatic passage(STIRAP).We demonstrate this two-photon pathway to the^(23)Na^(40)K ground state molecules and find that the one-way STIRAP transfer efficiency reaches75%.The molecules^(23)Na^(40)K in their rovibrational ground state are an ideal candidate for the quantum simulation and quantum information of ultracold molecules with long-range interaction.

关键词： ultracold atoms ultracold molecule STIRAP

血清IL-6、干扰素-γ、表皮生长因子在鼻咽癌患者中的表达及意义

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医学信息 2024年第2期37卷 107-110页

作者：俞丹菁廖永强夏洪娇萍乡市人民医院检验科

目的研究血清白细胞介素-6(IL-6)、干扰素-γ、表皮生长因子在鼻咽癌患者中的表达及价值。方法选取2019年3月-2022年3月在我院诊治的60例鼻咽癌患者为研究对象，并选取同期在我院体检的健康者60名作为对照组，两组均进行血清IL-6、干... 详细信息

目的研究血清白细胞介素-6(IL-6)、干扰素-γ、表皮生长因子在鼻咽癌患者中的表达及价值。方法选取2019年3月-2022年3月在我院诊治的60例鼻咽癌患者为研究对象，并选取同期在我院体检的健康者60名作为对照组，两组均进行血清IL-6、干扰素-γ、表皮生长因子检测。比较两组血清IL-6、干扰素-γ、表皮生长因子水平；分析鼻咽癌不同分期、不同放疗情况及不同预后患者上述指标差异；分析不同血清指标对鼻咽癌患者预后的预测价值。结果鼻咽癌患者血清IL-6、干扰素-γ水平低于对照组，表皮生长因子均高于对照组（P<0.05）；Ⅰ、Ⅱ、Ⅲ、Ⅳ期患者表皮生长因子水平呈上升趋势，血清IL-6、干扰素-γ水平呈下降趋势（P<0.05）；放疗耐受患者血清IL-6、干扰素-γ水平低于放疗敏感患者，表皮生长因子高于放疗敏感患者（P<0.05）；死亡患者血清IL-6、干扰素-γ水平低于存活患者，表皮生长因子水平高于存活患者（P<0.05）；血清IL-6+干扰素-γ+表皮生长因子联合检测预测鼻咽癌患者预后的敏感度、特异度均高于各指标单独检测（P<0.05）。结论鼻咽癌患者血清IL-6、干扰素-γ、表皮生长因子存在一定的特点，临床可通过检测各指标水平对鼻咽癌不同分期、不同放疗情况以及不同预后患者进行评估，尤其是血清IL-6、干扰素-γ、表皮生长因子三者联合检测可提高对鼻咽癌患者预后的预测价值，为临床制订治疗方案提供参考。

关键词： IL-6 干扰素-γ 表皮生长因子鼻咽癌

Design and optimization of cross bow-tie dipole feed with cavity for FAST

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Research in Astronomy and Astrophysics 2020年第5期20卷 132-136页

作者： jing-Long yu You-Ling yue Jian-Bin Li National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China CAS Key Laboratory of FAST National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China

A cross bow-tie dipole feed with cavity and symmetrical E and H plane pattern is presented for the Five hundred-meter Aperture Spherical radio Telescope(FAST).In this paper we describe the design,optimization and simulation results of a wide-band cross dipole feed with cavity covering the frequency range from 300 MHz to 600 MHz for *** main goals of our design are to ensure that,(1)we cover the octave bandwidth,(2)the feed has symmetrical E and H plane pattern,and(3)the physical dimension is suitable for mounting it in the reserved position of the FAST feed *** initial results indicate that we have met most of our design *** kind of feed had been equipped with the multi-beam receiver to carry out observation on the platform of FAST cabin.

关键词： telescope feed bow-tie dipole cavity FAST

Dual Z-scheme Bi_(3)TaO_(7)/Bi_(2)S_(3)/SnS_(2)photocatalyst with high performance for Cr(Ⅵ)reduction and TC degradation under visible light irradiation

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Rare Metals 2022年第7期41卷 2417-2428页

作者： jing-jing Xu Hao-yu Gu Min-Dong Chen Xue-Ping Li Hong-Wen Zhao Hong-Bin Yang Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing 210044China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Nanjing 210044China Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials Nanjing 210044China School of Environmental Science and Engineering Nanjing University of Information Science and TechnologyNanjing 210044China Nanyang Technological University Singapore 639798Singapore

Ternary direct dual Z-scheme Bi_(3)T_(a)O_(7)/Bi_(2)S_(3)/SnS_(2) photocatalyst was successfully prepared by hydrothermal *** composite photocatalysts exhibited high photocatalytic performance on both Cr(Ⅵ)reduction and tetracycline(TC)degradation under the irradiation of visible *** results manifested that the photogenerated charge transfer efficiency was improved after forming the dual Z-scheme *** a result,the composite catalysts exhibited higher photocat-alytic degradation efficiency than the corresponding single *** apparent rate constant(k)value of the best sample BBS-3 for TC degradation was 0.0403 min^(-1),which was 40 times,8 times,and 18 times higher than that of single *** the k value of BBS-3 for the Cr(Ⅵ)reduction was 0.0249 min^(-1),it was about 23 times,7 times,and 18 times that of single *** experiments indicated that the BBS-3 had good photocat-alytic ***,the possible mechanism on Cr(Ⅵ)reduction and TC degradation was proposed based on the experimental results.

关键词： Photocatalysis Dual Z-scheme Heterojunction Heavy metal Organic pollutant

On Weak Well-posedness of the Nearest Point and Mutually Nearest Point Problems in Banach Spaces

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Acta Mathematica Sinica,English Series 2021年第8期37卷 1303-1312页

作者： Zi Hou ZHANG Chun Yan LIU yu ZHOU jing ZHOU School of Mathematics Physics and Statistics Shanghai University of Engineering ScienceShanghai 201620P.R.China

Let G be a nonempty closed subset of a Banach space *** B(X)be the family of nonempty bounded closed subsets of X endowed with the Hausdorff distance and B_(G)(X)={A∈B(X):A∩G=φ},where the closure is taken in the metric space(B(X),H).For x∈X and F∈B_(G)(X),we denote the nearest point problem inf{||x-g||:g∈G}by min(x,G)and the mutually nearest point problem inf{||f-g||:f∈ F,g∈G}by min(F,G).In this paper,parallel to well-posedness of the problems min(a:,G)and mm(F,G)which are defined by De Blasi et al.,we further introduce the weak well-posedness of the problems min(x,G)and min(F,G).Under the assumption that the Banach space X has some geometric properties,we prove a series of results on weak well-posedness of min(x,G)and min(F,G).We also give two sufficient conditions such that two classes of subsets of X are almost Chebyshev sets.

关键词： The nearest point problem the mutually nearest point problem weak well-posedness relatively boundedly weakly compact set strict convexity dense Ga-subset

Microstructures and Mechanical Properties of Nb-Ti Bearing Hot-rolled TRIP Steels

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Journal of Materials Science & Technology 2006年第6期22卷 759-762页

作者： yu CHEN Guoyi TANG Haoyang tian Feipeng LI yu ZHANG Lihui WANG Zhaojun DENG Dexing LUO Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China Technology Center of Wuhan Iron and Steel Corp. Wuhan 430080 China Processing Research Institute of Dongfeng Motor Corp. Shiyan 442001 China

Nb-Tihot-rolled TRIP-assisted steel with high plasticity and appropriate volume percentage of retained austenite based on fine ferrite grain have been developed in the experiment. The test results showed that niobium tend to exist in solution state in matrix with less precipitation, and niobium-titanium could be precipitated in form of （Nb, Ti）C or （Nb, Ti）（C, N）, which play an important role in increasing yield strength （from 495 MPa to 610 MPa）. Besides, the retained austenite had a positive effect on improving the plasticity by transformation into martensite during tensile deformation.

关键词： Nb-Ti Hot-rolling TRIP-assisted steel