检索结果-南通市图书馆

An overview of rhenium effect in single-crystal superalloys

Rare Metals 2016年第2期35卷 127-139页

作者： ming huang Jing Zhu Beijing National Center for Electron Microscopy School of Materials Science and Engineering Tsinghua University Beijing 100084 China The State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084China

Nickel-based single-crystal superalloys are the key materials for the manufacturing and development of advanced aeroengines. Rhenium is a crucial alloying element in the advanced nickel-based single-crystal superalloys for its special strengthening effects. The addition of Re could effectively enhance the creep properties of the single-crystal superalloys; thus, the content of Re is considered as one of the characteristics in different-generation single-crystal superalloys. Owing to the fundamental importance of rhenium to nickel-based single-crystal superalloys, much progress has been made on understanding of the effect of rhenium in the single-crystal superalloys. While the effect of Re doping on the nickelbased superalloys is well documented, the origins of the socalled rhenium effect are still under debate. In this paper,the effect of Re doping on the single-crystal superalloys and progress in understanding the rhenium effect are reviewed. The characteristics of the d-states occupancy in the electronic structure of Re make it the slowest diffusion elements in the single-crystal superalloys, which is undoubtedly responsible for the rhenium effect, while the postulates of Re cluster and the enrichment of Re at the c/c0 interface are still under debate, and the synergistic action of Re with other alloying elements should be further ***, the interaction of Re with interfacial dislocations seems to be a promising explanation for the rhenium effect. Finally, the addition of Ru could help suppress topologically close-packed（TCP） phase formation and strengthen the Re doping single-crystal *** the mechanism of rhenium effect will be beneficial for the effective utilization of Re and the design of low-cost single-crystal superalloys.

关键词： Nickel-based single-crystal superalloys Rhenium effect Creep Strengthening mechanism Re cluster Interfacial dislocations

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

Analysis of the anti-T2DM components in dichloromethane fraction of Schisandra sphenanthera and its mechanism

引用

Traditional Medicine Research 2025年第1期10卷 27-43页

作者： Shi-Bo Feng Hai-Hui Jiang Hui-Li Kang yi Jiang Hua-Wei Zhang Xiao-Mei Song Yu-Ze Li Wen-Li huang Dong-Dong Zhang Chong Deng School of Pharmacy Shaanxi University of Chinese MedicineXianyang 712046China School of Pharmacy and Shaanxi Qinling Application Development and Engineering Center of Chinese Herbal Medicine Shaanxi University of Chinese MedicineXianyang 712046China Key Laboratory for Research and Development of“Qin Medicine”of Shaanxi Administration of Traditional Chinese Medicine Xianyang 712046China Shaanxi Key Laboratory of Research and Application of“Taibai Qi Yao” Xianyang 712046China

Background:The type 2 diabetes mellitus(T2DM)pharmacodynamic study of various parts of Schisandra sphenanthera was conducted in the previous stage,and it was found that dichloromethane extracted part(SDP)had a significant hypoglycemic ***,the components of SDP were analyzed,and the specific mechanism of its anti-T2DM was ***:We used a high-fat,high-sugar diet in combination with streptozotocin to induce a T2DM rat model,and the model rats were divided into two groups according to body weight and blood ***,oral glucose tolerance test,fasting blood glucose,low density lipoprotein cholesterol,superoxide dismutase,insulin,glycated hemoglobin,total cholesterol,nonesterified free fatty acids,alanine aminotransferase,high-density lipoprotein cholesterol,aspartate aminotransferase,malondialdehyde,and glutathione peroxidase were measured,organ indices were calculated,and pathological sections of pancreas and liver were *** 16S rRNA V3–V4 region of intestinal flora was sequenced to explore the effect of SDP on biochemical indicators and intestinal *** on the above indicators,the anti-T2DM mechanism of SDP in Schisandra sphenanthera was ***:After six weeks of administration,the biochemical indices of diabetic rats were diminished compared to the control *** SDP could significantly increase the gut microbialα-diversity index,resulting in significant changes in the flora of T2DM rats,with increased richness and diversity,reduced harmful flora,and significantly back-regulated the levels of acetic acid,propionic acid,and butyric ***:SDP can improve the symptoms associated with elevated blood glucose,dyslipidemia,elevated fasting insulin levels,and damaged glucose tolerance in *** against T2DM may be through the control of intestinal flora to normalize and exert anti-diabetic effect;its main active components may be lignans and terpenoids.

关键词： Schisandra sphenanthera T2DM intestinal flora HPLC

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

Exploration of Clinical Regularity in Acupuncture for Apoplexy Sequelae Based upon ‘Traditional Chinese Medical Acupuncture-moxibustion Information Databank'

引用

Journal of Acupuncture and Tuina Science 2014年第3期12卷 133-140页

作者： Zhang yi-ming huang Qin-feng huang Guo-qi Hospital of Traditional Chinese Medicine Zhabei District Shanghai Research Institute of Acupuncture and Meridian

In review of acupuncture literature from 1949 to 2010, in accordance with the data in ‘Traditional Chinese Medical Acupuncture-moxibustion Information Databank', the accounting analysis was used for comprehensive analysis and regularity summery of acupuncture therapy for apoplexy sequelae. The results showed that Hegu(LI 4), Zusanli(ST 36), Quchi(LI 11), Jianyu(LI 15), Sanyinjiao(SP 6), Yanglingquan(GB 34), Lianquan(CV 23), and Waiguan(TE 5) were used at the highest frequency. In the therapeutic methods, acupuncture was used at the highest frequency, followed by scalp acupuncture, and simultaneous application of acupuncture and herbal medicine.

关键词： Acupuncture-moxibustion Therapy Stroke Complications Bibliometrics Evaluation Studies Databases,Bibliographic Traditional Chinese Medicine

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

Ergodicity recovery of random walk in heterogeneous disordered media

引用

Chinese Physics B 2020年第5期29卷 165-173页

作者： Liang Luo ming yi Department of Physics Huazhong Agricultural UniversityWuhan 430070China Institute of Applied Physics Huazhong Agricultural UniversityWuhan 430070China School of Mathematics and Physics China University of GeosciencesWuhan 430074China

Significant and persistent trajectory-to-trajectory variance are commonly observed in particle tracking experiments,which have become a major challenge for the experimental data *** this theoretical paper we investigate the ergodicity recovery behavior,which helps clarify the origin and the convergence of trajectory-to-trajectory fluctuation in various heterogeneous disordered *** concepts of self-averaging and ergodicity are revisited in the context of trajectory *** slow ergodicity recovery and the non-Gaussian diffusion in the annealed disordered media are shown as the consequences of the central limit theorem in different *** strange ergodicity recovery behavior is reported in the quenched disordered case,which arises from a localization *** first-passage approach is introduced to the ergodicity analysis for this case,of which the central limit theorem can be employed and the ergodicity is recovered in the length scale of diffusivity correlation.

关键词： anomalous diffusion random walk disordered systems non-Gaussian diffusion

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

Observability Analysis and Navigation Algorithm for Distributed Satellites System Using Relative Range Measurements

引用

Journal of Systems Science & Complexity 2018年第5期31卷 1206-1226页

作者： SU Qiya huang yi Beijing Institute of Remote Sensing Equipment Beijing 100854 China Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China School of Mathematical Sciences University of Chinese Academy of Sciences Beijing 100049 China

The problem of navigation for the distributed satellites system using relative range mea- surements is investigated. Firstly, observability for every participating satellites is analyzed based on the nonlinear Keplerian model containing J2 perturbation and the nonlinear measurements. It is proven that the minimum number of tracking satellites to assure the observability of the distributed satellites system is three. Additionally, the analysis shows that the J2 perturbation and the nonlinearity make little contribution to improve the observability for the navigation. Then, a quasi-consistent extended Kalman filter based navigation algorithm is proposed, which is quasi-consistent and can provide an on- line evaluation of the navigation precision. The simulation illustrates the feasibility and effectiveness of the proposed navigation algorithm for the distributed satellites system.

关键词： Distributed satellites system (DSS) navigation observability quasi-consistent extendedKalman filter (QCEKF) relative range.

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

Mechanical and microstructural characterization of additive manufactured Inconel 718 alloy by selective laser melting and laser metal deposition

引用

Journal of Iron and Steel Research International 2022年第8期29卷 1322-1333页

作者： Fa-yun Lu Hong-yuan Wan Xin Ren Li-ming huang Hai-lin Liu Xin yi Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing 100871China

The direct comparison of the microstructure and tensile properties of Inconel 718 fabricated by selective laser melting (SLM) or laser metal deposition (LMD) has been carried out. In the as-built state, LMD-fabricated specimens show lower tensile yield strength and fracture elongation than SLM-fabricated specimens due to the coarser solidification microstructure, including grains, cellular dendrites and Laves phases. This is mainly because the cooling rate of the LMD process is 2 to 3 orders lower than that of the SLM process. Upon the same heat treatment, both yield strengths of SLMand LMD-fabricated specimens are enhanced significantly. Notably, LMD-fabricated specimens exhibit simultaneous improvement in the strength and ductility, which is mainly attributed to the presence of small granular Laves phases and uniformly distributed nanoscale c00 strengthening phases. The results could serve as a guidance for selecting suitable postheat treatment routes for specific additive manufacturing process to attain excellent strength-ductility synergy.

关键词： Inconel 718 alloy Selective laser melting Laser metal deposition Heat treatment Strength-ductility synergy

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

ADRC BASED INPUT DISTURBANCE REJECTION FOR MINIMUM-PHASE PLANTS WITH UNKNOWN ORDERS AND/OR UNCERTAIN RELATIVE DEGREES

引用

Journal of Systems Science & Complexity 2012年第4期25卷 625-640页

作者： Chunzhe ZHAO yi huang School of Computer Science and Engineering Chongqing Three Gorges University Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of Sciences

The capability of ADRC is studied for linear time-invariant SISO minimum-phase systems with unknown orders, uncertain relative degrees, and unknown input disturbances. It is proved that ADRC can reject the unknown input disturbance and guarantee the close-loop stability for the plants with unknown but bounded relative degrees. Meanwhile, some close-loop performances can be achieved. The influence of the sensor noise is also discussed. And it is demonstrated by numerical examples that one ADRC with fixed parameters can be applied to a group of plants of different orders, relative degrees, and parameters.

关键词： ADRC frequency performance sensor noise uncertain relative degree unknown input disturbance unknown order.

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

Tuning of Sampled-Data ADRC for Nonlinear Uncertain Systems

引用

Journal of Systems Science & Complexity 2016年第5期29卷 1187-1211页

作者： XUE Wenchao huang yi Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences

This paper concerns with the parameters tuning of active disturbance rejection control(ADRC) for a class of nonlinear systems with sampling rate not fast enough. The theoretical results show the quantitative relationship between the sampling rate, the parameters of ADRC, the size of uncertainties in system and the properties of the closed-loop system. Furthermore, the capability of the sampled-data ADRC under given sampling rate is quantitatively discussed.

关键词： Active disturbance rejection control (ADRC) extended state observer nonlinear uncertain systems parameters tuning sampled-data control.

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

Wave Attenuation and Turbulence Driven by Submerged Vegetation Under Current-Wave Flow

引用

China Ocean Engineering 2024年第4期38卷 602-611页

作者： huang Yu-ming Ding Lei WANG yi-fei CHEN Ben YANG Xiao-yu DOU Xi-ping School of Water Resources and Hydropower Engineering Wuhan UniversityWuhan430072China Key Laboratory of Port Waterway and Sedimentation Engineering of MOTNanjing Hydraulic Research InstituteNanjing 210029China

A set of laboratory experiments are carried out to investigate the effect of following/opposing currents on wave *** vegetation canopies with aligned and staggered configurations were tested under the condition of various regular wave heights and current velocities,with the constant water depth being 0.60 m to create the desired submerged *** show that the vegetation-induced wave dissipation is enhanced with the increasing incident wave height.A larger velocity magnititude leads to a greater wave height attenuation for both following and opposing current ***,there is a strong positive linear correlation between the damping coefficientβand the relative wave height H_(0)/h,especially for pure wave *** the velocity profile,the distributions of U_(min)and U_(max)show different patterns under combined wave and *** time-averaged turbulent kinetic energy(TKE)vary little under pure wave and U_(c)=±0.05 m/s *** the increase of flow velocity amplitude,the time-averaged TKE shows a particularly pronounced increase trend at the top of the *** vegetation drag coefficients are obtained by a calibration *** empirical relations of drag coefficient with Reynolds and Keulegane-Carpenter numbers are proposed to further understand the wave-current-vegetation interaction mechanism.

关键词： wave attenuation rigid vegetation following and opposing currents turbulent kinetic energy

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

有氧运动调节转化生长因子β/Smad通路缓解db/db糖尿病小鼠的肝脏纤维化

引用

中国组织工程研究 2025年第14期29卷 2951-2957页

作者：黄朝露黄毅吴昌燕李芳菲李海燕黔东南民族职业技术学院临床医学系贵州省凯里市556000 贵州医科大学基础医学院贵州省贵阳市550000 贵州中医药大学基础医学院贵州省贵阳市550000 温州医科大学附属第一医院康复科浙江省温州市325000

背景:有氧运动可抑制糖尿病小鼠肝纤维化,但具体作用机制尚未阐明。目的:基于转化生长因子β/Smad信号通路探讨有氧运动改善db/db小鼠肝纤维化的作用机制。方法:将8周龄雄性db/db小鼠和年龄匹配的m/m小鼠随机分为m/m对照组、m/m+运动组... 详细信息

背景:有氧运动可抑制糖尿病小鼠肝纤维化,但具体作用机制尚未阐明。目的:基于转化生长因子β/Smad信号通路探讨有氧运动改善db/db小鼠肝纤维化的作用机制。方法:将8周龄雄性db/db小鼠和年龄匹配的m/m小鼠随机分为m/m对照组、m/m+运动组、db/db对照组、db/db+运动组,每组10只,运动组小鼠接受12周有氧运动。运动结束后检测各组小鼠空腹血糖,进行葡萄糖耐量测试和胰岛素耐量测试;摘取肝脏计算肝脏指数,摘眼球取血检测生化指标;苏木精-伊红染色、油红O染色和Masson染色观察小鼠肝组织的病理变化,免疫组化检测肝组织中转化生长因子β1、p-Smad3的表达;Western blot检测肝组织中转化生长因子β1、Smad3、p-Smad3、α-平滑肌肌动蛋白、Ⅰ型胶原蛋白和Ⅲ型胶原蛋白表达水平。结果与结论:①与m/m组和m/m+运动组小鼠相比,db/db组小鼠体质量、肝质量、肝脏指数、空腹血糖、三酰甘油、总胆固醇、低密度脂蛋白和肌酶水平均显著升高(P<0.01);高密度脂蛋白水平显著降低(P<0.01);转化生长因子β1、p-Smad3、α-平滑肌肌动蛋白、Ⅰ型胶原蛋白和Ⅲ型胶原蛋白表达水平显著升高(P<0.01);葡萄糖、胰岛素耐量测试的曲线下面积显著增加(P<0.01);肝组织病理染色显示大量炎症细胞浸润,脂滴增多,明显纤维化;②与db/db组相比,db/db+运动组小鼠体质量、肝质量、肝脏指数、空腹血糖、三酰甘油、总胆固醇、低密度脂蛋白和肌酶水平显著降低(P<0.05或P<0.01);高密度脂蛋白水平显著升高(P<0.05);转化生长因子β1、p-Smad3、α-平滑肌肌动蛋白、Ⅰ型胶原蛋白和Ⅲ型胶原蛋白表达显著降低(P<0.05或P<0.01);此外,糖耐量、胰岛素耐量测试的曲线下面积明显减少(P<0.01,P<0.05),肝脏病理损伤得到明显改善;③结果表明,有氧运动有效减轻了糖尿病小鼠肝纤维化,其机制可能与调控转化生长因子β/Smad信号通路有关。

关键词：有氧运动转化生长因子β Smad 信号通路 db/db 肝纤维化

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：