检索结果-南通市图书馆

Journal of Iron and Steel Research International 2024年第8期31卷 1825-1839页

作者： Yun-qiang Zhao Hao-kun Yang Aloshyn Andria hong-hang lo Jia-xin Li Guangdong Provincial Key Laboratory of Advanced Welding Technology China-Ukraine Institute of WeldingGuangdong Academy of SciencesGuangzhou 510000GuangdongChina Smart Manufacturing Division Hong Kong Productivity CouncilHong Kong 999077China E.O.Paton Electric Welding Institute of National Academy of Sciences of Ukraine Kiev 01001KievanUkraine

Refill friction stir spot welding(RFSSW)provides a novel method to join similar and/or dissimilar metallic materials without a key-hole in the center of the *** the key-hole free characterization,the similar/dissimilar RFSSW joint exhibits remarkable and endurable characteristics,including high shear strength,long fatigue life,and strong corrosion *** the meanwhile,as the key-hole free joint has different microstructures compared with conventional friction stir spot welding,thus the RFSSW joint shall possess different shear and fatigue fracture mechanisms,which needs further *** explore the underlying failure mechanism,the similar/dissimilar metallic material joining parameters and pre-treatment,mechanical properties,as well as fracture mechanisms under this novel technology will be *** details,the welding tool design,welding parameters setting,and the influence of processing on the lap shear and fatigue properties,as well as the corrosion resistance will be mainly ***,the roadmap of RFFSW is also discussed.

关键词： Refill friction stir spot welding Processing Mechanism Similar materials joining Dissimilar materials joining Microstructure Mechanical property Fracture mechanism

long-term improvements in water conservation functions at Qilian Mountain National Park, northwest China

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 Mountain Science 2023年第10期20卷 2885-2897页

作者： GAO Xiang HUANG Xing-xing Chang Shu-hang DANG Qian-wen WEN Rui-yang lo Kevin LI Jie YAN An College of Earth and Environmental Sciences Lanzhou UniversityLanzhou 730000China Department of Geography Hong Kong Baptist UniversityHong Kong 999077China

Water conservation is one of the most important ecosystem *** study uses the InVEST model to examine the water conservation function of the Qilian Mountain National Park(QMNP),an important water supply area in northwest *** analyzed the spatiotemporal water conservation patterns of QMNP from 1988 to *** showed that the water conservation capacity in QMNP has increased over the past 32 years,reaching a peak of 6.495×108 m3 in *** area with an increased water conservation capacity is 12 times larger than the area with a reduced *** also examined how climatic,land-use,vegetation coverage,and topographical factors influence water conservation *** found that precipitation is the main climatic factor in water *** water conservation function also varies with land-cover type,with forests having the highest capacity,followed by ***,topographical factors,including altitude and slope,also shape the spatial patterns of water conservation functions in QMNP.

关键词： Water conservation function Ecosystem services InVEST model Qilian Mountain National Park Northwest China

矩形通道内超临界压力CO_(2)流动换热数值研究

在线全文

学校读者我要写书评

暂无评论

推进技术 2024年第8期45卷 145-155页

作者：李妮浦航周林曲航辰张义宁东明大连理工大学能源与动力学院辽宁大连116024 北京动力机械研究所北京100074 大连理工大学化工学院辽宁大连116024

针对高马赫数发动机热防护和机载设备长航程供电问题,基于超临界二氧化碳布雷顿循环提出了热防护与发电一体化系统。采用数值模拟方法探究了单侧受热矩形通道内超临界压力下CO_(2)的对流传热特性,并且分析了不同热流密度时入口温度、冷... 详细信息

针对高马赫数发动机热防护和机载设备长航程供电问题,基于超临界二氧化碳布雷顿循环提出了热防护与发电一体化系统。采用数值模拟方法探究了单侧受热矩形通道内超临界压力下CO_(2)的对流传热特性,并且分析了不同热流密度时入口温度、冷却流量和加热长度对冷却性能的影响。研究发现单侧受热矩形通道内SCO_(2)的流动换热存在周向不均匀性,增大冷却剂流量可以有效降低壁面温度。但对周向壁面温差影响较小并且温差随热流密度增大单调上升,由0.5 MW‧m^(-2)的最大温差75 K增加至2.0 MW‧m^(-2)的最大温差297 K。二次流在通道拐角处形成回流,局部扰流使传热增强。当流体温度高于拟临界温度时,定压比热容随入口温度的升高而减小,但是雷诺数的增大弥补了这一缺陷并使得换热能力增强。不同加热长度的冷却性能受传热特性影响,不发生传热恶化时,相同冷却流量条件下加热长度越大冷却后的壁面最高温度越高。但是当发生传热恶化时,不同加热长度冷却后的壁面最高温度分为相同和随加热长度增大两种情况。

关键词：热防护矩形通道超临界二氧化碳对流传热布雷顿循环

饲料中添加不同脂肪源对克氏原螯虾营养物质、脂肪酸组成的影响

在线全文

学校读者我要写书评

暂无评论

中国饲料 2024年第5期 101-107页

作者：杨旭红黄凯王丹丹曹鑫盛罗雨萧于凯黄娇广西大学动物科学技术学院广西南宁530004 天津赞兰科技有限公司天津300000 广西壮族自治区水产科学研究院广西南宁530000

为研究脂肪源对克氏原螯虾营养物质和脂肪酸组成的影响,在基础饲料中添加猪油(lo)、豆油(SO)、鱼油(FO)、鱼油和豆油1:1混合油(MO)为脂肪源配制成4种等氮等脂饲料。将600尾克氏原螯虾[(3.50±0.50)g]随机分为4组,每组3个重复,每个重复50... 详细信息

为研究脂肪源对克氏原螯虾营养物质和脂肪酸组成的影响,在基础饲料中添加猪油(lo)、豆油(SO)、鱼油(FO)、鱼油和豆油1:1混合油(MO)为脂肪源配制成4种等氮等脂饲料。将600尾克氏原螯虾[(3.50±0.50)g]随机分为4组,每组3个重复,每个重复50尾,按虾体质量的3%饲喂60 d。试验结果表明:MO组和FO组的肌肉与肝胰脏质量比、肌肉胶黏性显著大于lo组(P lo组粗蛋白质和粗灰分含量低于其他试验组(P lo组(37.54%)和SO组(39.95%)(P lo组(37.54%)和SO组(39.95%)(P <0.05)。综合体组成、质构、脂肪酸组成和脂肪源价格,选用鱼油和豆油1:1混合油作为克氏原螯虾饲料添加的脂肪源,有利于提高克氏原螯虾肌肉胶黏性、∑PUFA、DHA、EPA和ARA的含量。

关键词：克氏原螯虾脂肪源营养组成脂肪酸组成

同方期刊数据库

An all optical approach for comprehensive in-operando analysis of radiative and nonradiative recombination processes in GaAs double heterostructures

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2022年第6期11卷 1206-1217页

作者： Fan Zhang Jose Fcastaneda Timothy Hgfroerer Daniel Friedman Yong-hang Zhang Mark Wwanlass Yong Zhang Department of Electrical and Computer Engineering The University of North Carolina at CharlotteCharlotteNC 28223USA Songshan Lake Materials Laboratory DongguanGuangdong 523808China Department of Physics Davidson CollegeDavidsonNC 28035USA National Renewable Energy Laboratory GoldenCO 80401USA School of Electrical Computer and Energy EngineeringArizona State UniversityTempeAZ 85287USA Wanlass Consulting NorwoodCO 81423USA

We demonstrate an all optical approach that can surprisingly offer the possibility of yielding much more information than one would expect,pertinent to the carrier recombination dynamics via both radiative and nonradiative processes when only one dominant deep defect level is present in a semiconductor *** applying a band-defect state coupling model that explicitly treats the inter-band radiative recombination and Shockley-Read-Hall(SRH)recombination via the deep defect states on an equal footing for any defect center occupation fraction,and analyzing photoluminescence(PL)as a function of excitation density over a wide range of the excitation density(e.g.,5-6 orders in magnitude),in conjunction with Raman measurements of the lo-phonon plasmon(loPP)coupled mode,nearly all of the key parameters relevant to the recombination processes can be *** include internal quantum efficiency(IQE),minority and majority carrier density,inter-band radiative recombination rate(Wr),minority carrier nonradiative recombination rate(Wnr),defect center occupation fraction(f)),defect center density(Nt),and minority and majority carrier capture cross-sections(σt andσtM).While some of this information is thought to be obtainable optically,such as IQE and the Wr/Wnr ratio,most of the other parameters are generally considered to be attainable only through electrical techniques,such as current-voltage(Ⅰ-Ⅴ)characteristics and deep level transient spectroscopy(DLTS).Following a procedure developed herein,this approach has been successfully applied to three GaAs double-heterostructures that exhibit two distinctly different nonradiative recombination *** method greatly enhances the usefulness of the simple PL technique to an unprecedented level,facilitating comprehensive material and device characterization without the need for any device processing.

关键词： radiative defect approach

Synthesis of Silica Decorated MWCNTs for Field Emission Property

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

过程工程学报 2006年第Z2期6卷 245-248页

作者：陈正瀚彭毓航林鸿明罗吉宗 Dept.Mater.Eng. Tatung University FED R&D Division Tatung Corp.

A novel route to nanocomposites containing surface modified multiwalled carbon nanotubes(MWCNTs) by silica thin film is *** effect of chemical oxidation on the surface of MWCNTs by using different acid-treatments is *** acidic processes are characterized by Raman spectroscopy,thermogravimetry analysis,scanning electron microscopy,and transmission electron *** can be coated homogeneously with silica film by using tetraethoxysilane(TEOS) as a precursor in a sol-gel *** the shell thickness of amorphous silica coating layers on MWCNTs exhibits excellent thermal stability,reliability,and lifetime of field emission properties,especially down to less than 10 nm.

关键词： multiwalled carbon nanombes tetraethoxysilane sol-gel method

Human immune repertoire in hepatitis B virus infection

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2021年第25期27卷 3790-3801页

作者： Qiao Zhan Jing-hang Xu Yan-Yan Yu Emily lo KK Felicianna Hani El-Nezami Zheng Zeng Department of Infectious Diseases Peking University First HospitalBeijing 100034China School of Biological Sciences University of Hong KongHong KongChina Institute of Public Health and Clinical Nutrition School of MedicineUniversity of Eastern FinlandKuopio FI-70211Finland

Hepatitis B virus(HBV)infection is a public health threat that affects 257 million people worldwide and can progress to liver cirrhosis,liver failure,and hepatocellular *** HBV antigen-induced adaptive immune response plays an important role in HBV *** repertoire sequencing(IRS)has been used to investigate the molecular mechanisms behind the immune system,find novel ways to treat HBV infection,and evaluate the genetic responses and immune characteristics of individuals infected by HBV or immunized by HBV *** review summarizes the human immune repertoire analysis methodology,and the application of the IRS in the prediction of HBV infection progression,treatment,and vaccination.

关键词： Immune repertoire T-cell receptor B-cell receptor Hepatitis B virus Chronic viral infection High-throughput sequencing

A novel glasses-free virtual reality rehabilitation system on improving upper limb motor function among patients with stroke:A feasibility pilot study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Medicine in Novel Technology and Devices 2021年第3期11卷 125-131页

作者： Haoyu Xie Hantao Zhang Haowen Liang hang Fan Jianying Zhou Wai Leung Ambrose lo Le Li Department of Rehabilitation Medicine The First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou510080China School of Physics Sun Yat-sen UniversityGuangzhou510275China Guangzhou Midstereo Co.Ltd. Guangzhou510275China Institute of Medical Research Northwestern Polytechnical UniversityXi’an710072China

Background:Virtual reality(VR)technology is increasingly used in stroke *** study aimed to investigate the effectiveness of using the glasses-free VR training to improve motor function of upper limb in patients with ***:Twelve patients with stroke were recruited to participate in the intervention of 3 *** the baseline and post intervention,two times of evaluation including Fugl-Meyer upper-extremity scale(FMS-UE),transcranial magnetic stimulation(TMS)measurement and motion evaluation were ***:No significant difference was observed between two groups at baseline *** the intervention,the FMS-UE scores presented a greater improvement in the VR group compared with the control *** measurement showed that there was significant difference in cortex latency and central motor conduction time between two groups after the intervention,but no significant difference in the amplitude of motor event potential was *** addition,there was a significant correlation between game scores and FMS-UE ***:The novel glasses-free VR training was at least as effective as conventional occupational therapy in upper limb motor function,improving nerve conduction time and corticospinal excitability in patient with stroke.

关键词： Virtual reality Transcranial magnetic stimulation Stroke Upper limb motor function Fugl-meyer upper-extremity scale Corticospinal excitability

STING regulates BCR signaling in normal and malignant B cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2021年第4期18卷 1016-1031页

作者： Chih-hang Anthony Tang Avery C.Lee Shiun Chang Qin Xu Andong Shao Yun lo Walker T.Spalek Javier A.Pinilla-lbarz Juan R.Del Valle Chih-Chi Andrew Hu The Wistar Institute 3601 Spruce StreetPhiladelphiaPA 19104USA Department of Malignant Hematology H.Lee Moffitt Cancer Center&Research InstituteTampaFL 33612USA Department of Chemistry&Biochemistry University of Notre DameNotre DameIN 46556USA

STING is an endoplasmic reticulum(ER)-resident protein critical for sensing cytoplasmic DNA and promoting the production of type Ⅰ interferons;however,the role of STING in B cell receptor(BCR)signaling remains *** generated STING V154M knock-in mice and showed that B cells carrying constitutively activated STING specifically degraded membrane-bound IgM,Ig a and Igβ via SEL1L/HRD1-mediated ER-associated degradation(ERAD).B cells with activated STING were thus less capable of responding to BCR activation by phosphorylating Igα and Syk than those without activated *** immunized with T-independent antigens,STING V154M mice produced significantly fewer antigen-specific plasma cells and antibodies than immunized wild-type(WT)*** further generated B cell-specific STING^(KO) mice and showed that STING^(KO) B cells indeed responded to activation by transducing stronger BCR signals than their STING-proficient *** B cell-specific STING^(KO) mice were T-independently immunized,they produced significantly more antigen-specific plasma cells and antibodies than immunized STIN^(WT)*** both human and m ouse IGHV-unmutated malignant chronic lymphocytic leukemia(CLL)cells downregulated the expression of STING,we explored whether STING downregulation could contribute to the well-established robust BCR signaling phenotype in malignant CLL *** generated a STING-deficient CLL mouse model and showed that STING-deficient CLL cells were indeed more responsive to BCR activation than their STING-proficient *** results revealed a novel B cell-intrinsic role of STING in negatively regulating BCR signaling in both normal and malignant B cells.

关键词： STING BCR ER-associated degradation CLL Plasma cells

Context-Aware Using Carrier Phase for Adaptive MEMS IMU / GNSS Filtering in Deep Urban Navigation

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 Harbin Institute of Technology(New Series) 2013年第2期20卷 45-49页

作者： Hua Liu Tong Liu hang Guo School of Automation Beijing Institute of Technology Academy of Space Technology Nanchang University

Context-aware is becoming standard on the most mobile navigation devices. The performance of MEMS IMU/GNSS gains significant benefits from context information in terms of improvement of filter＇ s adaptive capability. A context-aware algorithm using differential carrier phase was proposed to recognize a molile MEMS IMU/GNSS equipped vehicle＇ s stationary, slow moving or fast moving status. The corresponding context error in awarding was analyzed and consequently conducted two fading factors based on the analysis The factors were applied in the system＇ s adaptive filter with targeting applications in deep urban where severe multipath presents. The dense urban field test shows that the false alarm of proposed context-aware algorithm is less than 5% and the adaptive filtering can achieve around 15% improvement in terms of lo in two-dimension position accuracy.

关键词： MEMS IMU GNSS Context-Aware Adaptive Fihering