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葡萄园喷雾牵引车翼型塔板仿真分析与优化设计

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北京化工大学学报（自然科学版） 2024年第3期51卷 98-106页

作者：魏彬陈伟春马聪北京化工大学机电工程学院北京100029 宁夏农林科学院农业经济与信息技术研究所银川750000

针对宁夏贺兰山区域葡萄种植环境与作物冠层特征,设计了一种带有浮动结构的翼型塔板导流装置,其浮动结构可依据不同生长时期的葡萄作物高度进行调整。利用计算流体力学(CFD)软件对塔板气流场进行仿真分析,以翼型浮动塔板出风口处高速气... 详细信息

针对宁夏贺兰山区域葡萄种植环境与作物冠层特征,设计了一种带有浮动结构的翼型塔板导流装置,其浮动结构可依据不同生长时期的葡萄作物高度进行调整。利用计算流体力学(CFD)软件对塔板气流场进行仿真分析,以翼型浮动塔板出风口处高速气流区域的面积最大值为目标,通过正交分析获得浮动结构与固定结构最佳优化导流几何参数与导风锥参数。在塔板优化结果的基础上,针对浮动结构可调极限角度进行仿真分析,建立风送塔板结构仿真模型,得出其气流汇集的离地高度范围与有效喷施距离。按照设计参数加工装配塔板浮动结构,结合样机完成喷药效能试验。以建立的模型指导各时期葡萄的施药工作,为精准施药提供技术基础。试验结果表明,塔板气流场分布特点与仿真结果基本符合,风送塔板结构仿真模型可靠。

关键词：风送喷雾机流体仿真气流场导流结构

Laser-induced Janus graphene/poly(p-phenylene benzobisoxazole)fabrics with intrinsic flame retardancy as flexible sensors and breathable electrodes for fire-fighting field

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Nano Research 2023年第5期16卷 7600-7608页

作者： Yu Luo Yaping Miao Huimin Wang Kai Dong Lin Hou Yanyan Xu weichun chen Yao Zhang Yingying Zhang Wei Fan School of Textile Science and Engineering Key Laboratory of Functional Textile Material and Product of Ministry of EducationXi’an Polytechnic UniversityXi’an 710048China Department of Chemistry Tsinghua UniversityBeijing 100084China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 100083China Shaanxi Textile Research Institute Co. Ltd.Xi’an 710038China

Conventional firefighting clothing and fire masks can protect firemen’s safety to a certain extent,whereas cannot perceive environmental hazards and monitor their physical status in real ***,we fabricated two kinds of Janus graphene/poly(pphenylene benzobisoxazole)(PBO)fabrics by laser direct writing approach and evaluated their performance as intelligent firefighting clothes and fire *** results showed that the Janus graphene/PBO fabrics were virtually non-combustible and achieved the highest thermal protection time of 18.91 s ever reported in flame,which is due to the intrinsic flame-retardant nature of PBO *** graphene/PBO woven fabrics-based sensor showed good repeatability and stability in human motion monitoring and NO_(2)gas ***,the piezoelectric fire mask was assembled with graphene/PBO nonwoven fabric as electrode layer and polyvinylidene fluoride(PVDF)electrostatic direct writing film as piezoelectric *** filtration efficiency of the fire mask reaches 95%for PM_(2.5)and 100%for PM_(3.0),indicating its effective filtration capability for smoke particles in *** respiratory resistance of the piezoelectric fire mask(46.8 Pa)was lower than that of commercial masks(49 Pa),showing that it has good wearing ***,the piezoelectric fire mask can be sensitive to the speed and intensity of human breathing,which is essential for indirectly reflecting the health of the human ***,this work provides a facile approach to fabricate next-generation intrinsic flame-retardant smart textiles for smart firefighting.

关键词： poly(p-phenylene benzobisoxazole)(PBO)fibers laser-induced graphene flame retardancy textile electronics intelligent fire protection

A Novel Strategy to Fabricate Core-Sheath Structure Piezoelectric Yarns for Wearable Energy Harvesters

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Advanced Fiber Materials 2021年第4期3卷 239-250页

作者： Lili Xue Wei Fan Yang Yu Kai Dong chengkun Liu Yanli Sun Cong Zhang weichun chen Ruixin Lei Kai Rong Qi Wang School of Textile Science and Engineering Xi’an Polytechnic UniversityXi’an 710048ShaanxiChina State Key Laboratory of Intelligent Textile Material and Products Xi’an Polytechnic UniversityXi’an 710048ShaanxiChina Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 100083China

Wearable and portable electronic devices based on textile structure have been widely used owing to their wearability and ***,yarn fineness and the comfort of the fabric cannot satisfy the requirements of smart wearable *** work presents a novel strategy to prepare highly integrated PVDF/conductive nylon core-sheath structure piezoelectric yarns for wearable which is fabricated by combining electrospinning strategy with 2D braiding *** fineness of single yarns as well as strength are both improved significantly compared to previous *** piezoelectric outputs of the yarn are still stable after 800 s fatigue test at a frequency of 4 Hz,and the cycle stability can maintain more than 3200 ***,the piezoelectric yarns are further woven into piezoelectric plain *** to the electrical performance,the length of the piezoelectric yarn and the thickness of the piezoelectric layer would both affect the output electrical *** yarn of the 10 cm in length and 600μm in fineness can produce an output voltage of 120 ***,Both the piezoelectric yarn and the fabric could generate piezoelectric output signals through human movement,such as bending,***,the electrical and mechanical performance of the piezoelectric yarns prepared in our work could be improved significantly,and the comfortableness and durability performance of the piezoelectric fabric can satisfy most wearing requirements,which would provide some help in the field of piezoelectric wearable devices based on yarns and fabrics.

关键词： Electrospinning 2D braiding technology Piezoelectric yarns Energy harvester

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国际法上的风险预防原则

现代法学 2007年第5期29卷 113-121页

作者：陈维春华北电力大学人文学院北京102206

风险预防原则已经成为国际和国内环境保护法律制度的一项重要的基本原则。该原则要求我们在进行任何的经济活动之前就对该活动可能会对自然环境和生态系统造成的影响进行风险预测,并相应采取针对性的措施,从而更好地保护自然环境和生态... 详细信息

风险预防原则已经成为国际和国内环境保护法律制度的一项重要的基本原则。该原则要求我们在进行任何的经济活动之前就对该活动可能会对自然环境和生态系统造成的影响进行风险预测,并相应采取针对性的措施,从而更好地保护自然环境和生态系统。但如何将该原则运用到危险废物越境转移领域,仍然有待我们进行理论上的探讨。应加强对危险废物越境转移中运用该原则等方面的探讨。

关键词：风险预防风险预防原则危险废物越境转移

Spatiotemporal characteristics of seed rain and soil seed bank of artificial Caragana korshinskii Kom. forest in the Tengger Desert, China

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Journal of Arid Land 2024年第4期16卷 550-566页

作者： SHEN Jianxiang WANG Xin WANG Lei WANG Jiahui QU Wenjie ZHANG Xue CHANG Xuanxuan YANG Xinguo chen Lin QIN weichun ZHANG Bo NIU Jinshuai College of Ecological Environment Ningxia UniversityYinchuan 750021China Key Laboratory of Restoration and Reconstruction of Degraded Ecosystems in Northwest China Ministry of EducationNingxia UniversityYinchuan 750021China College of Agriculture Ningxia UniversityYinchuan 750021China

Vegetation restoration and reconstruction are effective approaches to desertification control and achieving social and economic sustainability in desert ***,the self-succession ability of native plants during the later periods of vegetation restoration remains ***,this study was conducted to bridge the knowledge gap by investigating the regeneration dynamics of artificial forest under natural *** information of seed rain and soil seed bank was collected and quantified from an artificial Caragana korshinskii *** in the Tengger Desert,*** germination tests were conducted in a laboratory *** analysis of species quantity and diversity in seed rain and soil seed bank was conducted to assess the impact of different durations of sand fixation(60,40,and 20 a)on the progress of vegetation restoration and ecological conditions in artificial *** *** results showed that the top three dominant plant species in seed rain were Echinops gmelinii Turcz.,Eragrostis minor Host.,and Agropyron mongolicum Keng.,and the top three dominant plant species in soil seed bank were ***,Chloris virgata Sw.,and *** restoration period increased,the density of seed rain and soil seed bank increased first and then *** for species richness,as restoration period increased,it gradually increased in seed rain but decreased in soil seed *** was a positive correlation between seed rain density and soil seed bank density among all the three restoration *** species similarity between seed rain or soil seed bank and aboveground vegetation decreased with the extension of restoration *** shape of the seeds,specifically those with external appendages such as spines and crown hair,clearly had an effect on their dispersal,then resulting in lower seed density in soil seed *** addition,precipitation was a crucial factor in promoting rapid germination,also resulting in lower seed density in soi

关键词： ecological restoration soil seed bank seed rain artificial forest vegetation desertification Caragana korshinskii Tengger Desert

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热致变色涂层技术研究进展

宇航材料工艺 2015年第1期45卷 1-4页

作者：陈维春李志陈新龙中国空间技术研究院钱学森空间技术实验室北京100094

热致变色涂层技术是航天器热控分系统的一项重要技术,对于未来航天器执行多任务、适应空间复杂多变的热环境具有重要意义。文中分析了航天器热控对热致变色涂层技术的需求,介绍了热致变色涂层的技术原理和国内外研究情况。在此基础上,... 详细信息

热致变色涂层技术是航天器热控分系统的一项重要技术,对于未来航天器执行多任务、适应空间复杂多变的热环境具有重要意义。文中分析了航天器热控对热致变色涂层技术的需求,介绍了热致变色涂层的技术原理和国内外研究情况。在此基础上,总结了热致变色涂层技术的发展规律及趋势,并对我国热致变色涂层技术的后续发展提出了建议。

关键词：热致变色涂层进展

苏云金芽孢杆菌生产菌株溶原性噬菌体pep基因的克隆、表达及功能分析

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微生物学报 2008年第4期48卷 459-465页

作者：廖威陈维春贾艳华庞义中山大学生命科学学院有害生物控制与资源利用国家重点实验室广州510275 广西职业技术学院食品技术系南宁530226 广东医学院生化和分子生物研究所湛江524023

溶原性噬菌体的随机爆发是微生物杀虫剂苏云金芽孢杆菌(Bacillus thuringiensis,B.t)发酵生产的首要危害。【目的】本文的目的就是通过研究B.t生产菌株溶原性噬菌体的遗传背景,以便从分子水平上控制其在生产中的随机爆发。【方法】通过... 详细信息

溶原性噬菌体的随机爆发是微生物杀虫剂苏云金芽孢杆菌(Bacillus thuringiensis,B.t)发酵生产的首要危害。【目的】本文的目的就是通过研究B.t生产菌株溶原性噬菌体的遗传背景,以便从分子水平上控制其在生产中的随机爆发。【方法】通过对广东梅州某公司的生产菌株MZ1采用Mitomycin C进行诱导,提取噬菌体颗粒MZTP01的基因组DNA,克隆和表达该噬菌体的pep基因,并进行了功能分析。【结果】诱导获得的溶原性噬菌体MZTP01斑点清晰,直径约1mm,成斑时间12h;从噬菌体基因组DNA双酶切(HindⅢ/EcoRⅠ)片段中回收长度为2362bp的D片段(Genbank登录号:AY639599),又从D片段中克隆了长度为1101bp、编码367aa、分子量为47kDa的pep基因,表达载体M15(pQE30pep)在大肠杆菌(Escherichia coli,***)中表达获得了47kDa的清晰表达带,在1h时开始产生蛋白并有逐步上升的趋势;Western blot也在47kDa处得到一条清晰的条带;可溶性分析表明PEP蛋白在重组菌株中是以不可溶的包含体形式存在的,该蛋白的产生明显地抑制了宿主的生长速度;噬菌体PEP氨基酸序列之间的同源性比较表明,噬菌体MZTP01PEP蛋白与来自***12噬菌体的PEP蛋白的同源性程度最大。【结论】我们获得了一种新的噬菌体MZTP01,并首次报道了该噬菌体D片段的核苷酸序列及pep基因的功能,试验证明PEP表达蛋白能够水解酪蛋白,其活力相当于0.3mg/mL的胰蛋白酶。

关键词：苏云金芽孢杆菌溶原性噬菌体 pep基因克隆功能分析

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美国孔子学院文化活动的创新与发展

科教文汇 2015年第9期 143-144页

作者：陈为春宿迁学院江苏宿迁223800

美国境内开设的孔子学院数量已逾90所,作为宣传中国文化和进行文化交流的重要平台,美国孔子学院不仅进行语言和文化课教学,而且举办了众多的旨在推介中国文化、促进文化对话的主题活动。这些文化活动体现了孔子学院成立的意义,并通过创... 详细信息

美国境内开设的孔子学院数量已逾90所,作为宣传中国文化和进行文化交流的重要平台,美国孔子学院不仅进行语言和文化课教学,而且举办了众多的旨在推介中国文化、促进文化对话的主题活动。这些文化活动体现了孔子学院成立的意义,并通过创新文化活动,在实质上促进了中美各个层次的文化交流。

关键词：美国孔子学院文化活动文化交流

MZTP02噬菌体tmp基因的鉴定:与尾巴装配相关的蛋白质

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中山大学学报（自然科学版） 2013年第6期52卷 114-118,123页

作者：宋少云廖威陈维春李广宏中山大学生命科学学院∥有害生物控制与资源利用国家重点实验室广东广州510275 广西职业技术学院食品与生物技术系广西南宁530226 广东医学院生化和分子生物研究所广东湛江524023

苏云金芽孢杆菌(Bacillus thuringiensis)广泛用于生物防治,但溶原性噬菌体的随机爆发严重影响了它的生产。一种新的苏云金芽孢杆菌溶原性噬菌体被分离出来并进行了基因组测序。TMP(tape measure protein)蛋白质具有协助和控制噬菌体尾... 详细信息

苏云金芽孢杆菌(Bacillus thuringiensis)广泛用于生物防治,但溶原性噬菌体的随机爆发严重影响了它的生产。一种新的苏云金芽孢杆菌溶原性噬菌体被分离出来并进行了基因组测序。TMP(tape measure protein)蛋白质具有协助和控制噬菌体尾巴装配的功能,是噬菌体侵染期间协助其吸附宿主的一种必需蛋白质。使用PCR方法从MZTP02噬菌体基因组中扩增出tmp基因后,连接到pQE30质粒并用M15菌株进行表达,获得了相对分子质量为35 000的蛋白质条带;该蛋白质经Ni-NTA纯化后,作为抗原注入新西兰家兔制备获得多克隆抗体;Western blot分析发现了一条与原核表达大小一致的蛋白质表达带。噬菌体悬浮液混合TMP血清抗体后测定双层平板的滴度,在噬菌体的侵染复数(m.o.i)小于1的情况下,噬菌体的滴度与血清抗体的质量浓度呈反比关系。当一定滴度的噬菌体悬液分别混合25μg/mL和250μg/mL的血清质量浓度时,滴度分别为1×105pfu/mL和2×103pfu/mL。这一结果表明TMP血清抗体能够与TMP蛋白质相结合,从而导致了噬菌体滴度的降低。

关键词：苏云金芽孢杆菌溶原性噬菌体 tmp基因原核表达装配