检索结果-南通市图书馆

Review and Perspective of Tailorable Metal-Organic Framework for Enhancing Microwave Absorption

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2023年第9期41卷 1080-1098页

作者： Peng Miao Juan Chen Jianxin Chen jie kong Kai-jie Chen School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi'anShaanxi 710072China School of Materials and Chemical Engineering Xi'an Technological UniversityXi'anShaanxi 710021China Research&Development Institute of Northwestern Polytechnical University in Shenzhen ShenzhenGuangdong 518057China

Metal-organic frameworks(MOFs)and their pyrolytic derivates,displaying diverse chemical compositions and microstructures,pro-vide the infinite potential for preparing high-performance microwave absorption materials(MAMs)and have attracted extensive *** this review,we systematically reviewed the recent progress of MOF-based MAMs,including three types of MOF-based MAMs(MOF-derived metal/carbon nanocomposites,MOF-based hybridization materials and conductive MOF).Besides that,the microwave absorption properties and their related physical and chemical appearance were also *** behalf of synergistic effects between microstructures,dielectric components and magnetic response,the MOF-based MAMs show excellent microwave absorption performance,which is superior to that of traditional single metal,metal alloy and pure carbon-based ***-more,the novel conductive MOF with tunable electrical conductivity shows great potential in MAMs due to the fact that it can dra-matically simplify the synthesis process.

关键词： Metal-organic frameworks Crystal structure Interfaces Microwave absorption materials Microstructures

零鱼粉饲料与高鱼粉饲料饲喂下凡纳对虾饲料利用效率相关性状的遗传评估

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

渔业科学进展 2024年第5期45卷 174-182页

作者：朱相燕孟宪红代平孔杰栾生曹家旺谭建邢群浙江海洋大学水产学院浙江舟山316022 中国水产科学研究院黄海水产研究所、海水养殖生物育种与可持续产出全国重点实验室山东青岛266071 青岛海洋科技中心海洋渔业科学与食物产出过程功能实验室山东青岛266237 邦普种业科技有限公司山东潍坊261311

为探讨选育零鱼粉需求凡纳对虾(Penaeus vannamei)品种的可能性,解决目前鱼粉短缺、饲料成本居高不下的问题,本研究在零鱼粉饲料(蛋白含量占38%)和高鱼粉饲料(鱼粉含量占25%,蛋白含量占42%)饲喂条件下进行凡纳对虾饲料利用效率相关性状... 详细信息

为探讨选育零鱼粉需求凡纳对虾(Penaeus vannamei)品种的可能性,解决目前鱼粉短缺、饲料成本居高不下的问题,本研究在零鱼粉饲料(蛋白含量占38%)和高鱼粉饲料(鱼粉含量占25%,蛋白含量占42%)饲喂条件下进行凡纳对虾饲料利用效率相关性状的遗传评估。选择30个家系进行40 d的单尾饲养实验,结果显示,饲喂高鱼粉饲料对虾的平均增重率(62.00%)和平均饲料效率比(124.00%)明显高于饲喂零鱼粉饲料(23.50%和49.40%)。对虾摄食量和增重率在零鱼粉饲料和高鱼粉饲料饲喂下的遗传力在0.458±0.140到0.699±0.155之间,饲料效率比在零鱼粉饲料和高鱼粉饲料饲喂下的遗传力分别为0.186±0.098和0.341±0.110。由于没有剖分出共同环境效应,遗传力都存在一定程度高估,因此,零鱼粉饲料饲喂下的饲料效率比的遗传变异并不高。摄食量和增重率在2种饲料间的遗传相关分别为0.580±0.171和0.676±0.155,表示这2个性状存在中等的基因型与饲料互作效应。饲料效率比在2种饲料间的遗传相关仅为0.299±0.304,表示该性状存在严重的基因型与饲料互作效应。综上结果来看,使用零鱼粉饲料不利于凡纳对虾的养殖及选育工作的开展。

关键词：凡纳对虾饲料效率比遗传力遗传相关基因型与饲料互作

凡纳滨对虾在低氧环境下存活性状的遗传参数评估

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

渔业科学进展 2024年第1期45卷 138-147页

作者：段毓佳谭建栾生罗坤王宏杰隋娟孟宪红孔杰湖州师范学院浙江省水生生物资源养护与开发技术研究重点实验室、中国水产科学研究院水生动物繁育与营养重点实验室浙江湖州313000 中国水产科学研究院黄海水产研究所农业农村部海洋渔业与可持续发展重点实验室山东青岛266071 海洋渔业科学与食物产出过程功能实验室山东青岛266071 邦普种业科技有限公司山东潍坊261000

在水产养殖中,尤其是高密度养殖情况下,缺氧会短期内造成个体的大量死亡,从而影响生产效益。本研究以凡纳滨对虾(Litopenaeus vannamei)高抗和快大2个品系作为研究对象,利用高致死溶解氧(DO)胁迫的方式,对2个品系各41个家系共计6560尾... 详细信息

在水产养殖中,尤其是高密度养殖情况下,缺氧会短期内造成个体的大量死亡,从而影响生产效益。本研究以凡纳滨对虾(Litopenaeus vannamei)高抗和快大2个品系作为研究对象,利用高致死溶解氧(DO)胁迫的方式,对2个品系各41个家系共计6560尾幼虾进行低氧耐受性测试,统计高致死溶解氧水平下幼虾的存活性状,分析不同品系间及同一品系不同家系间耐低氧性状的差异,评估其遗传参数;对耐受性有显著差异的家系个体的鳃、肌肉、肝胰腺组织进行组织学观察,并比较其细胞水平上的差异。结果显示,在0.3mg/L低氧条件下,高抗品系和快大品系的家系半致死存活率SS50均表现出显著差异(P<0.05),高抗品系SS50为49.30%,快大品系SS50为42.52%;家系间存活时间的变异系数分别为60%和45%。利用阈值性状动物模型,以半致死时的个体存活状态作为观测值(存活为1,死亡为0)估算的遗传参数为(0.345±0.031)~(0.378±0.029),经过转换后在连续变化的观测值尺度上的遗传力为(0.219±0.031)~(0.237±0.029),表现为中等遗传力水平。高抗品系中低氧耐受家系和低氧敏感家系的鳃、肌肉和肝胰腺组织均出现不同程度的损伤,但不同的家系间表现出不同程度的抗逆生理特征差异,这可能与高抗不同家系抗逆耐受力强弱有关。不同家系间在低氧胁迫下的存活时间、生理特性差异以及各品系遗传力估算结果表明,凡纳滨对虾对高致死溶解氧水平的耐受性状存在丰富的遗传变异,具有选育的可行性。

关键词：凡纳滨对虾低溶解氧遗传力组织损伤选育

维普期刊数据库博看期刊

Ultraflexible,highly efficient electromagnetic interference shielding,and self-healable triboelectric nanogenerator based on Ti_(3)C_(2)T_(x) MXene for self-powered wearable electronics

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第5期100卷 1-11页

作者： Yuzhang Du Xudong Wang Xingyi Dai Wenxuan Lu Yusheng Tang jie kong Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Integrating smart functions into one flexible electronic is vastly valuable in improving their working performances and broadening ***,this work reports a ultraflexible,highly efficient electromagnetic interference(EMI)shielding,and self-healable triboelectric nanogenerator(TENG)that is assembled by modified Ti_(3)C_(2)T_(x) MXene(m-MXene)-based nanocomposite *** from the excellent electronegativity of m-MXene,the single-electrode mode-based TENG can generate high open-circuit voltage(V_(oc))oscillating between-65 and 245 V,high short-circuit current(I_(sc))of 29 μA,and an instantaneously maximum peak power density of 1150 mW m^(-2) that can power twenty light-emitting diodes(LEDs).Moreover,the resultant TENG possesses outstanding EMI shielding performance with the maximum shielding effectiveness of 48.1 dB in the *** enhanced shielding capability is dominated by the electromagnetic absorption owning to high conduction loss in m-MXene network,multiple reflections between m-MXene sheets,and polarization effect on the surface of m-MXene ***,a self-powered wearable sensor is fabricated based on the as-prepared *** sensor shows an intrinsic healing ability with healing efficiency of 98.2% and can accurately detect the human large-scale motions and delicate physical *** work provides an enhanced way to fabricate the wearable electronics integrated with smart functions,and the reported MXene-based TENG may have a broad prospect in the fields of aerospace,artificial intelligence,and healthcare systems.

关键词： MXene Triboelectric nanogenerator(TENG) Wearable electronics Electromagnetic interference(EMI) Self-healing

Digital Light Processing 3D-Printed Ceramic Metamaterials for Electromagnetic Wave Absorption

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2022年第7期14卷 279-292页

作者： Rui Zhou Yansong Wang Ziyu Liu Yongqiang Pang Jianxin Chen jie kong MOE Key Lab of Materials Physics and Chemistry in Extraordinary Conditions Shaanxi Key Lab of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Key Laboratory of Optical System Advance Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033People’s Republic of China School of Electronic Science and Engineering Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China

Combining 3D printing with precursor-derived ceramic for fabricating electromagnetic(EM) wave-absorbing metamaterials has attracted great attention. This study presents a novel ultraviolet-curable polysiloxane precursor for digital light processing(DLP) 3D printing to fabricate ceramic parts with complex geometry, no cracks and linear shrinkage. Guiding with the principles of impedance matching, attenuation, and effective-medium theory, we design a crosshelix-array metamaterial model based on the complex permittivity constant of precursor-derived ceramics. The corresponding ceramic metamaterials can be successfully prepared by DLP printing and subsequent pyrolysis process, achieving a low reflection coefficient and a wide effective absorption bandwidth in the X-band even under high temperature. This is a general method that can be extended to other bands, which can be realized by merely adjusting the unit structure of meta-materials. This strategy provides a novel and effective avenue to achieve “target-design-fabricating” ceramic metamaterials, and it exposes the downstream applications of highly efficient and broad EM wave-absorbing materials and structures with great potential applications.

关键词： Electromagnetic wave absorption Metamaterial Precursor-derived ceramics 3D printing

A numerical study on smoke behaviors in inclined tunnel fires under natural ventilation

在线全文

学校读者我要写书评

暂无评论

Journal of Safety Science and Resilience 2022年第2期3卷 169-178页

作者： jie kong Wenjiao You Zhisheng Xu Hui Liu Haihang Li College of Quality&Safety Engineering China Jiliang UniversityHangzhou 310018China Zhejiang Police College Hangzhou 310053China School of Civil Engineering Central South UniversityChangsha 410075China

To investigate the effect of tunnel slope on hot gas movement and smoke distribution in a slopping tunnel fire,a series of tunnel fire models are built by fire dynamics simulator(FDS),with a slope varies from 0 to 10%.Parameters such as ceiling temperature and airflow velocity are *** results indicate that the relationship between smoke back-layering length and tunnel slope can be described as an exponential *** smoke temperature at the downstream exit first increased and then decreased with a higher *** airflow velocity at downstream outlet increased nonlinearity when tunnel slope was less than 8%.In the slope tunnel,the fire smoke spread process can be divided into three *** smoke spreads upstream to the peak distance,subsequently,the upstream smoke layer decreases gradually,the tunnel fire reaches a quasi-steady *** backflow characteristics of smoke in sloped tunnels are coupled with the downstream length and outlet smoke *** the initial stage of a slope tunnel fire,smoke spreads upstream for a long distance,endangering human health.

关键词： Tunnel fire Slope Stack effect Smoke movement Back-layering length

A Two-Dimensional Semiconductive Metal-Organic Framework for Highly Efficient Microwave Absorption

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2022年第4期40卷 467-474页

作者： Peng Miao Tao Zhang Teng Wang Juan Chen Tong Gao You Wang jie kong Kai-jie Chen School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi'anShaanxi 710072China School of Materials Science and Chemical Engineering Xi'an Technological UniversityXi'anShaanxi 710021China

Comprehensive Summary Advanced microwave absorbing materials(MAMs)are urgently required to eliminate and attenuate microwaves to address the ubiquitous microwave radiations and *** this contribution,we report the microwave absorption application of a two-dimensional(2D)semiconductive metal-organic framework(MOF),i.e.,CuHT(HT=4-hydroxythiophenol),without any pyrolysis at high temperature.

关键词： Metal-organic frameworks Microwave absorption Layered compound Conduction loss Density functional calculations

PBO fibers/fluorine-containing liquid crystal compound modified cyanate ester wave-transparent laminated composites with excellent mechanical and flame retardance properties

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第21期152卷 16-29页

作者： Zheng Liu Xiaoli Fan Junliang Zhang Lixin Chen Yusheng Tang jie kong Junwei Gu Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

Bisphenol A dicyanate ester resins modified by fluorine-containing liquid crystal compound(LCFE)are applied as polymer matrix(LCFE-BADCy),poly(p-phenylene-2,6-benzobisoxazole)(PBO)fibers as rein-forcements,and fluorine/adamantane PBO precursor(pre FABPBO)as interfacial compatibilizer to prepare the corresponding PBO fibers/FABPBO/LCFE-BADCy wave-transparent laminated *** could improve the order degree of BADCy cured network,in favor of enhancing the wave-transparent perfor-mance,mechanical properties,and intrinsic thermal *** dielectric constant and dielectric loss of PBO fibers/FABPBO/LCFE-BADCy composites are highly temperature(25–200℃)and frequency(10^(4)–10^(7) Hz and 8.2–12.4 GHz)stable with the value of 2.49 and 0.003 under 10^(6) Hz at 25℃,and the corresponding wave transmission efficiency is 95.0%,higher than that of 92.5%for PBO fibers/BADCy *** interlamellar shear strength and flexural strength are respectively 50.7 MPa and 682.5 MPa,38.1%and 16.2%higher than those of PBO fibers/BADCy ***,the volume resistivity,breakdown voltage,heat resistance index,glass transition temperature,flame retardant grade,and ul-timate oxygen index of PBO fibers/FABPBO/LCFE-BADCy composites are respectively 5.3×10^(15)Ωcm,29.75 kV/mm,217.2℃,245.7℃,V-1 grade,and 33.6%,expected to be performed as a new generation of“lightweight/loading/wave-transparent”electromagnetic window materials in advanced military weapons and civil communication base station.

关键词： Bisphenol A dicyanate ester(BADCy)resins Fluorine-containing liquid crystal compound Poly(p-phenylene-2,6-benzobisoxazole) (PBO)fibers Fluorine/adamantane PBO precursor Wave-transparent laminated composites

ZnO/nitrogen-doped carbon nanocomplex with controlled morphology for highly efficient electromagnetic wave absorption

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第19期114卷 206-214页

作者： Zhen Yu Rui Zhou Mingwei Ma Runqiu Zhu Peng Miao Pei Liu jie kong MOE Key Laboratory of Materials Physics and Chemistry in Extraordinary Conditions Shaanxi Key Laboratory of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

In this work,zeolitic imidazolate framework-8(ZIF-8)with yolk-shell and hollow structures were pre-pared by a convenient chemical etching method.A subsequent pyrolysis of ZIF-8 enabled one to pro-duce ZnO/nitrogen-doped carbon nanocomplexes with original ZIF-8 morphology,where hollow struc-ture showed superior electromagnetic wave absorption capacity and was responsible for matching the impedance of free *** minimum reflection coefficients of hollow ZnO/nitrogen-doped carbon nanocomplexes were-51.2 dB(700℃)and-52.4 dB(800℃),respectively,whereas the effective ab-sorption band width was as large as 4 GHz and the content of pyrolyzed hollow ZIF-8 was 15 wt%,which was inferior to the level among similar electromagnetic wave(EMW)absorption *** conve-nient and facile strategy paves the way toward designing hierarchical structures for highly efficient and light-weight electromagnetic wave absorbers.

关键词： Zeolitic imidazolate framework Electromagnetic wave absorption Yolk-shell structure Hollow structure Lightweight materials