检索结果-南通市图书馆

Experimental investigation and numerical analysis on high-efficiency shock vectoring control serpentine nozzles

CHINESE JOURNAL OF AERONAUTICS 2024年第12期37卷 296-324页

作者： Hui, Zhonghao Shi, Jingwei lin, wentao Zhou, Li Wang, Zhanxue Liu, Yongquan Northwestern Polytech Univ Sch Power & Energy Xian 710072 Peoples R China Natl Key Lab Sci & Technol Adv Light Duty Gas Turb Xian 710129 Peoples R China Collaborat Innovat Ctr Adv Aeroengine Beijing 100191 Peoples R China

The high-efficiency Shock Vectoring Control Serpentine Nozzle (SVCSN) takes into account both thrust vectoring and infrared stealth, and significantly improves the comprehensive performance of the aero-engines through an additional auxiliary duct. In this paper, the schlieren photographs at the exit of the high-efficiency SVCSN and the wall static pressure distributions were obtained by experiments, and the numerical results were used to enrich the thrust vectoring characteristics. The effects of the auxiliary injection were analyzed first to reveal the advantages of the high-efficiency SVCSN compared to the conventional SVCSN. Then, the aerodynamic parameters and the structural parameters of the high-efficiency SVCSN were investigated, including the Nozzle Pressure Ratio (NPR), the Secondary flow Pressure Ratio (SPR), the secondary flow relative area and the secondary flow injection angle. Finally, the coupling performance of the high-efficiency SVCSN is studied by using the approximate modeling technology. Results show that the auxiliary injection increases the range between the two shock legs of the "k" shock wave induced by the secondary flow, then causes the separation zone and high-pressure boss of the down wall to expand upstream, and finally results in a prominent increase in the thrust vectoring performance. The thrust vectoring angle and Vectoring Efficiency (VE) of the high-efficiency SVCSN are about 61.6% and 75.7%, respectively, higher than those of the conventional SVCSN at NPR = 6. The effects of the NPR and the SPR on the thrust vectoring performance of the high-efficiency SVCSN are coupled with each other. A larger NPR matched with a smaller SPR shows better thrust vectoring performance. The maximum fluctuations in thrust vectoring angle and VE caused by the NPR and SPRare about 22% and 64%. The VE decreases monotonously with the increase of the secondary flow relative area. Smaller secondary flow injection angle shows better thrust vector performan

关键词： Shock vectoring control Serpentine nozzle Auxiliary injection Thrust vectoring performance Flow control

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cytocompatibility with osteogenic cells and enhanced in vivo anti-infection potential of quaternized chitosan-loaded titania nanotubes

引用

Bone Research 2016年第3期4卷 140-153页

作者： Ying Yang Haiyong Ao Yugang Wang wentao lin Shengbing Yang Shuhong Zhang Zhifeng Yu Tingting Tang Shanghai Key Laboratory of Orthopedic Implants Department of Orthopedic SurgeryShanghai Ninth People’s HospitalShanghai Jiao Tong UniversitySchool of Medicine

Infection is one of the major causes of failure of orthopedic implants. Our previous study demonstrated that nanotube modification of the implant surface, together with nanotubes loaded with quaternized chitosan （hydroxypropyltrimethyl ammonium chloride chitosan, HACC）, could effectively inhibit bacterial adherence and biofilm formation in vitro. Therefore, the aim of this study was to further investigate the in vitro cytocompatibility with osteogenic cells and the in vivo anti-infection activity of titanium implants with HACC-loaded nanotubes （NT-H）. The titanium implant （Ti）, nanotubes without polymer loading （NT）, and nanotubes loaded with chitosan （NT-C） were fabricated and served as controls. Firstly, we evaluated the cytocompatibility of these specimens with human bone marrow-derived mesenchymal stem cells in vitro. The observation of cell attachment, proliferation, spreading, and viability in vitro showed that NT-H has improved osteogenic activity compared with Ti and NT-C. A prophylaxis rat model with implantation in the femoral medullary cavity and inoculation with methiciUin-resistant Staphylococcus aureus was established and evaluated by radiographical, microbiological, and histopathological assessments. Our in vivo study demonstrated that NT-H coatings exhibited significant anti-infection capability compared with the Ti and NT-C groups. In conclusion, HACC-loaded nanotubes fabricated on a titanium substrate show good compatibility with osteogenic cells and enhanced anti-infection ability in vivo, providing a good foundation for clinical application to combat orthopedic implant-associated infections.

关键词： NT Cytocompatibility with osteogenic cells and enhanced in vivo anti-infection potential of quaternized chitosan-loaded titania nanotubes HACC

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

linking leaf elemental traits to biomass across forest biomes in the Himalayas

引用

Science China Earth Sciences 2024年第5期67卷 1518-1528页

作者： Nita DYOLA Eryuan LIANG Josep PEÑUELAS J.Julio CAMARERO Shalik Ram SIGDEL Sugam ARYAL wentao lin Xiang LIU Yongwen LIU Xingliang XU Sergio ROSSI State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Laboratoire sur lesécosystèmes terrestres boréaux Département des Sciences FondamentalesUniversitédu QuébecàChicoutimi555Boulevard de l′UniversitéChicoutimi(QC)G7H2B1Canada CSIC Global Ecology Unit CREAF-CSIC-UABBellaterraE-08193 CataloniaSpain CREAF Cerdanyola del VallèsE-08193 CataloniaSpain Instituto Pirenaico de Ecología(IPE-CSIC) Avenida Montañana 1005Zaragoza 50059Spain Friedrich-Alexander-Universität Erlangen-Nürnberg Institut für GeographieErlangen 91058Germany State Key Laboratory of Grassland Agro-Ecosystems College of EcologyLanzhou UniversityLanzhou 730000China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Plants require a number of essential elements in different proportions for ensuring their growth and *** elemental concentrations in leaves reflect the functions and adaptations of plants under specific environmental ***,less is known about how the spectrum of leaf elements associated with resource acquisition,photosynthesis and growth regulates forest biomass along broad elevational *** examined the influence of leaf element distribution and diversity on forest biomass by analyzing ten elements(C,N,P,K,Ca,Mg,Zn,Fe,Cu,and Mn)in tree communities situated every 100 meters along an extensive elevation gradient,ranging from the tropical forest(80 meters above sea level)to the alpine treeline(4200 meters above sea level)in the Kangchenjunga Landscape in eastern Nepal *** calculated communityweighted averages(reflecting dominant traits governing biomass,i.e.,mass-ratio effect)and functional divergence(reflecting increased trait variety,i.e.,complementarity effect)for leaf elements in a total of 1,859 trees representing 116 *** increasing mass-ratio effect and decreasing complementarity in leaf elements enhance forest biomass accumulation.A combination of elements together with elevation explains biomass(52.2%of the variance)better than individual elemental trait diversity(0.05%to 21%of the variance).Elevation modulates trait diversity among plant species in biomass *** promotes biomass at lower elevations,but reduces biomass at higher elevations,demonstrating an interaction between elevation and *** interaction between elevation and mass-ratio effect produces heterogeneous effects on biomass along the elevation *** research indicates that biomass accumulation can be disproportionately affected by elevation due to interactions among trait diversities across vegetation *** higher trait variation enhances the adaptation of species to environmental changes,it reduces

关键词： Ecosystem function Elevational gradient Functional diversity Functional traits Leaf elements Niche complementarity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Gene expression profiles and phosphorylation patterns of AMP-activated protein kinase subunits in various mesenchymal cell types

引用

Chinese Medical Journal 2014年第13期127卷 2451-2457页

作者： Wang Yugang Fan Qiming Ma Rui lin wentao Tang Tingting Shanghai Key Laboratory of Orthopedic Implants Department ofOrthopedic Surgery Shanghai Ninth People's Hospital ShanghaiJiaotong University School of Medicine Shanghai 200011 China

Background Recent studies on bone have shown an endocrine role of the skeleton,which could be impaired in various human diseases,including osteoporosis,obesity,and diabetes-associated bone *** a sensor and regulator of energy metabolism,AMP-activated protein kinase （AMPK） may also play an important role in the regulation of bone *** current study aimed to establish the expression profiles and phosphorylation patterns of AMPK subunits in several mesenchymal cell *** Reverse transcription-polymerase chain reaction （PCR） for relative quantification,real-time PCR for absolute quantification,and Western blotting were used to investigate the gene expression profiles and phosphorylation patterns of AMPK subunits in several mesenchymal cell types,including primary human mesenchymal stem cells （hMSCs） and hFOB,Saos-2,C3H/10T1/2,MC3T3-E1,3T3-L1,and C2C12 *** AMPKα1 and AMPKβ1 mRNAs were abundantly expressed in all cell ***1 mRNA was abundantly expressed in C3H/10T1/2,MC3T3-E1,3T3-L1,and C2C12 but not detected in human-derived cell ***2 mRNA was mildly expressed in all cell ***α1 protein was highly expressed in all cell types and AMPKα2 protein was highly expressed only in hFOB and Saos-2 ***β1 protein was abundantly expressed in all cell types except for Saos-2,in which AMPKβ2 protein overwhelmed AMPKβ1 ***1 and AMPKY2 proteins were expressed in C3H/10T1/2,MC3T3-E1,3T3-L1,and C2C12 cells and only AMPKY2 protein was expressed in hMSCs,hFOB and Saos2 ***α was phosphorylated at Thr172 and Ser485 and AMPKβ1 was phosphorylated at Ser108 and Ser182 in all cell types with a specific pattern in each cell *** The combination of AMPK α,β,and Y subunits and phosphorylation of AMPKα （Thr172 and Ser485） and AMPKβ1 （Ser108 and Ser182） showed a specific pattern in each cell type.

关键词： AMP-activated protein kinase gene expression phosphorylation mesenchymal stem cells

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

对当代中国社会学经验研究及研究方法的分析与反思——90年代社会学经验研究论文的内容分析

引用

社会学研究 2000年第6期 38-48页

作者：林彬王文韬北京大学社会学系

The present thesis investigated 341 empirical studies published in Sociological Research during 1990s. The researchers conducted quantitative analyses of empirical studies and research methods in *** following findings have been made:1)In comparison with 1980s,substantial improvements have been achieved in empirical research during *** studies reflect enhanced scientific accountability and regularity.2)There have been significant changes in the constitution of sociological researchers;sociology has reached a new stage of institutionalization and professionalism.3)Yet many deficiencies exist in the application of concrete research ***,experience inclination and policy\|inclination,which were characteristic of sociological research in China during 1980s,still *** sociologists should made substantial improvements regarding the problems above.

关键词：中国社会学经验研究研究方法学科建设思想认识

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

运动激活骨骼肌卫星细胞:增龄性肌衰减症及肌肉损伤修复的运动预防和治疗

引用

中国组织工程研究 2021年第23期25卷 3752-3759页

作者：王震蔺海旗何霏林文弢广东青年职业学院广东省广州市510545 上海体育学院上海市200438 华南理工大学体育学院广东省广州市510641 上海市第一人民医院上海市200080 广州体育学院广东省广州市510500

背景:骨骼肌是维持人体健康的主要组织,其衰减症会影响人们的健康和生活质量。肌卫星细胞是骨骼肌干细胞,受到运动刺激时激活增殖与分化,促进肌肉肥大,延缓肌衰减症的发生。目的:为增龄性肌衰减症、肌肉萎缩及肌肉损伤修复提供运动预防... 详细信息

背景:骨骼肌是维持人体健康的主要组织,其衰减症会影响人们的健康和生活质量。肌卫星细胞是骨骼肌干细胞,受到运动刺激时激活增殖与分化,促进肌肉肥大,延缓肌衰减症的发生。目的:为增龄性肌衰减症、肌肉萎缩及肌肉损伤修复提供运动预防和治疗指导,同时为后续研究提供理论支撑。方法:在知网、PubMed、Web of Science等数据库中,英文以“skeletal muscle,satellite cells,proliferation,differentiation,muscle repair和sarcopenia”为关键词,中文以“运动、肌卫星细胞、增殖与分化”为关键词,检索2010至2020年发表的相关文献,对题目和摘要初步筛选,全文阅读后纳入100篇文献进行综述。结果与结论:①运动激活肌卫星细胞增殖与分化的研究较多,与耐力运动(有氧)相比,抗阻运动效果更显著;②不同的运动形式可激活不同类型肌卫星细胞的增殖与分化,其运动强度、负荷阈值、运动时间和频次等因素均影响卫星细胞激活增殖与分化程度;③运动激活肌卫星细胞增殖与分化信号通路相互作用的研究不足,发现运动可调控肌细胞外基质、氧化应激水平及细胞自噬,改善肌衰减症;④运动激活肌卫星细胞增殖与分化的信号通路如何有效协同促进还需更多深入研究与探索。

关键词：运动肌卫星细胞肌衰减症肌肉萎缩综述

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

EFFECTS OF REACTIVE OXYGEN SPECIES AND ANTIOXIDANT ENZYMES OF RAT DURING INTERMITTENT HYPOXIC TRAINING

EFFECTS OF REACTIVE OXYGEN SPECIES AND ANTIOXIDANT ENZYMES O...

引用

第4届全国青年体育科学学术会议

作者： Liying Huang, wentao lin , Xiquan Weng Guangzhou Institute of Physical Education,Guangzhou ,China 510075

＜正＞Introduction: To explore: the changes of reactive oxygen species and antioxidant enzyme during the development of acclimatization. Methods: One hundred male Sprague-Dawley rats were randomly divided into three groups: normoxia group, acute hypoxia group and intermittent hypoxic group. Normoxia group included normoxia control and normoxia training sub-groups;acute hypoxia group included acute hypoxia control and acute hypoxia

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

耐力运动对营养性肥胖大鼠Galectin-3表达的影响

引用

中国运动医学杂志 2018年第7期37卷 588-593页

作者：李志刚林文弢百色学院广西百色533000 广州体育学院广东广州510500

目的:探讨耐力运动能否通过影响半乳糖凝集素3(Galectin-3)的表达,进而改善营养性肥胖大鼠的胰岛素抵抗状况。方法:6周龄雄性SD大鼠30只,随机分成普通饲料喂养组(N组,n=8)和高脂饲料喂养组(HFD组,n=22),HFD组进行为期8周的肥胖大鼠造模... 详细信息

目的:探讨耐力运动能否通过影响半乳糖凝集素3(Galectin-3)的表达,进而改善营养性肥胖大鼠的胰岛素抵抗状况。方法:6周龄雄性SD大鼠30只,随机分成普通饲料喂养组(N组,n=8)和高脂饲料喂养组(HFD组,n=22),HFD组进行为期8周的肥胖大鼠造模,造模成功后又随机分成安静对照组(C组,n=8)和耐力运动组(E组,n=8),E组进行8周的中等强度耐力训练,末次训练后,N、C和E组大鼠采集内脏脂肪、腹主动脉取血并进行相关指标测定。结果:8周高脂饲料喂养后,HFD组大鼠体重和Lee’s指数显著高于N组(P<0.05),HFD组大鼠血清甘油三酯、总胆固醇、低密度脂蛋白胆固醇以及血糖水平显著高于N组,而高密度脂蛋白胆固醇则显著降低(P<0.05)。8周运动干预后,C组大鼠体重、内脏脂肪百分比、Gal-3、瘦素(Leptin)水平显著高于N组(P<0.05);E组大鼠的内脏脂肪百分比、Gal-3、Leptin浓度和胰岛素抵抗指数(HOMA-IR)指数均显著低于C组(P<0.05),血脂四项指标也有显著性差异(P<0.05);另外,Gal-3的浓度与体重、Leptin浓度和HOMA-IR指数均存在显著性相关。结论:高脂喂养的肥胖大鼠血脂代谢紊乱,Gal-3浓度升高,8周的耐力运动可能通过降低血液中Gal-3的浓度改善肥胖大鼠的胰岛素抵抗。

关键词：耐力运动肥胖胰岛素抵抗半乳糖凝集素3 胰岛素抵抗指数

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

不同运动强度干预2型糖尿病模型大鼠的内脂素及糖代谢变化

引用

中国组织工程研究 2020年第26期24卷 4196-4200页

作者：李颖林文弢翁锡全肇庆市体育学校广东省肇庆市526000 广州体育学院广东省广州市510500

背景:内脂素具有胰岛素样的降糖作用,在2型糖尿病的治疗中可能有着积极的意义,不同运动强度对其的影响也不同。目的:观察6周不同强度有氧运动干预2型糖尿病大鼠糖代谢的效应及内脂素变化的特点并探讨其关系。方法:采用高脂饲料喂养并注... 详细信息

背景:内脂素具有胰岛素样的降糖作用,在2型糖尿病的治疗中可能有着积极的意义,不同运动强度对其的影响也不同。目的:观察6周不同强度有氧运动干预2型糖尿病大鼠糖代谢的效应及内脂素变化的特点并探讨其关系。方法:采用高脂饲料喂养并注射链脲佐菌素的方法,建立雄性SD大鼠2型糖尿病模型,将造模成功的43只大鼠随机分为糖尿病安静对照组10只,糖尿病运动Ⅰ,Ⅱ,Ⅲ组各11只。此3个运动组大鼠运动强度分别为10,15,20m/min,运动量均为1h/d,每周5d,持续运动6周后采集血样,检测糖代谢相关指标、血清及内脏脂肪内脂素水平。结果与结论:(1)实验中3个运动组糖代谢相关指标(空腹血糖、糖化血清蛋白、胰岛素及胰岛素抵抗指数等)均出现了改善,同时糖尿病运动Ⅰ,Ⅱ组血清内脂素水平均出现非常显著性降低(P0.05);(2)糖尿病运动Ⅰ,Ⅱ,Ⅲ组内脏脂肪内脂素水平出现了显著性下降(P<0.05),其中糖尿病运动Ⅱ内脏脂肪内脂素下降最显著(P<0.01);(3)结果证实,中、低强度有氧运动能更有效改善2型糖尿病大鼠胰岛素抵抗状态,降低血糖浓度,且与内脏脂肪减少和内脂素分泌减少有关,内脂素可能起了积极的作用。

关键词：有氧运动大鼠 2型糖尿病内脂素内脏脂肪胰岛素抵抗高脂饮食胰岛素糖代谢链脲佐菌素

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

尿液蛋白质组学评估机体病理性变化的意义

引用

中国组织工程研究 2021年第20期25卷 3259-3266页

作者：蔺海旗陈亮唐璐翁锡全林文弢华南理工大学体育学院广东省广州市510641 广州中医药大学体育健康学院广东省广州市510006 华南师范大学体育科学学院广东省广州市510006 广州体育学院广东省广州市510500

背景:在体育科研中,尿蛋白是评价运动负荷的一项重要指标。尿液蛋白质组学技术突破了以往的技术限制,所分析的差异蛋白图谱对于揭示机体对运动应激的适应机制和筛选表征运动水平的尿蛋白生物标志物具有重要作用。目的:应用功能内稳态概... 详细信息

背景:在体育科研中,尿蛋白是评价运动负荷的一项重要指标。尿液蛋白质组学技术突破了以往的技术限制,所分析的差异蛋白图谱对于揭示机体对运动应激的适应机制和筛选表征运动水平的尿蛋白生物标志物具有重要作用。目的:应用功能内稳态概念概述正常尿液蛋白质组学研究历程及其在体育科研中评估机体病理性变化的最新研究进展,以期为运动负荷评定寻找无创方法提供参考。方法:以"urinary proteome,exercise,biomarkers,function-specific homeostasis;尿液,蛋白质组学,运动,生物标志物,功能内稳态"为关键词,在CNKI、万方、PubMed数据库及SCI数据库中检索1988年1月至2020年7月的相关文献并进行归纳分析。结果与结论:国内外在运动性蛋白尿方面进行诸多研究,主要集中在运用尿蛋白评定运动负荷大小、运动强度和身体机能。研究发现,运动后尿总蛋白、白蛋白、β2-微球蛋白显著增加,且具有明显的强度依赖。尿液蛋白质组学图谱的差异性表达可用于监测运动性疲劳、预防肌损伤、运动选材及机体病理性变化。

关键词：尿液蛋白质组学生物标志物功能内稳态反兴奋剂亚健康负荷评定差异表达

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：