检索结果-南通市图书馆

High-voltage frequency domain spectroscopy analysis of a thermally aged XLPE submarine cable under continuous and cyclic voltage based on carrier transport and polarisation characteristics

引用

High Voltage 2022年第3期7卷 473-482页

作者： Xize Dai jian hao Zheng jian Ruijin Liao Xinlong Zheng Yiyi Zhang State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina State Grid Zhejiang Electric Power Supply Company ZhoushanChina School of Electrical Engineering Guangxi UniversityNanningChina

In order to ensure the safe operation of submarine cables,it is of great significance to analyse the insulation state of submarine cables from the perspectives of microstructure,carrier transport characteristics and macroscopic dielectric *** this study,based on the high-voltage frequency domain spectroscopy(HV-FDS)measurement system,HV-FDS experiments of fresh and thermally aged submarine cables were carried out under continuous(0.5,2,4 and 10 kV)and cyclic(2-10-2 kV)applied alternating ***,combining the changes of the microstructure structure of cross-linked poly-ethylene(XLPE)insulation,the aggregate structure deterioration model of XLPE was proposed to discuss the physical mechanism of HV-FDS characteristics of submarine cables under different voltages and insulation *** show that the HV-FDS characteristics of submarine cables have significant voltage dependence under contin-uous voltage *** HV-FDS of submarine cables show memory characteristics under cyclic voltage *** with the fresh submarine cable,the thermally aged submarine cable shows more significant voltage dependence and memory charac-teristics of *** memory characteristics of HV-FDS are mainly determined by the carriers transport and the interfacial polarisation caused by the accumulation of polar particles at the electrode/dielectric *** study covers the correlation mecha-nism among the microstructure,carrier transport and macroscopic HV-FDS properties of submarine cable insulation,which lays a foundation for further research and condition evaluation of submarine cables.

关键词： submarine characteristics transport

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

Diffusion tensor imaging of horizontal extraocular muscles in patients with concomitant and paralytic esotropia

引用

International Journal of Ophthalmology(English edition) 2023年第8期16卷 1350-1355页

作者： Ming-hao Chen jian-Hua Yan State Key Laboratory of Ophthalmology Zhongshan Ophthalmic CenterSun Yat-sen UniversityGuangdong Provincial Key Laboratory of Ophthalmology and Visual ScienceGuangzhou 510060Guangdong ProvinceChina

AIM:To assess metrics of diffusion tensor imagining(DTI)in evaluating microstructural abnormalities of horizontal extraocular muscles(EOM)in ***:Six adult concomitant esotropia patients,5 unilateral abducent paralysis patients and 2 healthy volunteers were *** magnetic resonance imaging(MRI)and DTI were performed on all subjects using 3T MR *** anisotropy(FA),mean diffusivity(MD),axial diffusivity(AD),and radial diffusivity(RD)of medial and lateral rectus muscles were measured and compared between patients group and control ***:Medial rectus MD and RD within the adducted eye of concomitant patients was significantly greater than that in unilateral abducent paralysis patients(0.259×10-2 mm^(2)/s vs 0.207×10-2 mm^(2)/s,P=0.014;0.182×10-2 mm^(2)/s vs 0.152×10-2 mm^(2)/s,P=0.017).Both strabismus patients showed a significantly decreased MD and AD than that obtained in normal controls for lateral rectus muscles(Ptant strabismus patients was significantly decreased than that in healthy controls(0.259×10-2 mm^(2)/s vs 0.266×10-2 mm^(2)/s,P=0.010).Lateral rectus AD of the adducted eye in concomitant strabismus patients was significantly decreased as compared with that in healthy controls(0.515×10-2 mm^(2)/s vs 0.593×10-2 mm^(2)/s,P=0.013).No statistically significant differences were present between the adducted and fixating eyes in concomitant strabismus ***:DTI represents a feasible technique to assess tissue characteristics of *** effects of eye position changes on DTI parameters are *** MD and RD could be evidence for remodeling of the medial rectus muscle *** medial and lateral recuts MD of concomitant esotropia patients indicates a thinner fibrous structure of the *** MD and AD should be general character of esotropia.

关键词： diffusion tensor imagining extraocular muscle esotropia strabismus

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

Data fusion methods in multimodal human computer dialog

引用

Virtual Reality & Intelligent Hardware 2019年第1期1卷 21-38页

作者： Ming-hao YANG jian-Hua TAO National Laboratory of Pattern Recognition Institute of Automation Chinese Academy of SciencesBeijing 100190China The Center for Excellence in Brain Science and Intelligent Technology of Chinese Academy of Sciences Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China

In multimodal human computer dialog,non-verbal channels,such as facial expression,posture,gesture,etc,combined with spoken information,are also important in the procedure of ***,in spite of high performance of users*single channel behavior computing,it is still great challenge to understand users1 intention accurately from their multimodal *** reason for this challenge is that we still need to improve multimodal information fusion in theories,methodologies and practical *** paper presents a review of data fusion methods in multimodal human computer *** first introduce the cognitive assumption of single channel processing,and then discuss its implementation methods in human computer dialog;for the task of multi-modal information fusion,serval computing models are presented after we introduce the principle description of multiple data ***,some practical examples of multimodal information fusion methods are introduced and the possible and important breakthroughs of the data fusion methods in future multimodal human-computer interaction applications are discussed.

关键词： Intention understanding Multimodal human computer dialog

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

Phylogenetic structure and phylogenetic diversity of angiosperm assemblages in forests along an elevational gradient in Changbaishan,

引用

Journal of Plant Ecology 2014年第2期7卷 154-165页

作者： Hong Qian Zhanqing hao jian Zhang Research and Collections Center Illinois State Museum1011 East Ash StreetSpringfieldIL 62703USA State Key Laboratory of Forest and Soil Ecology Institute of Applied EcologyChinese Academy of SciencesShenyang 110164China Department of Renewable Resources University of AlbertaEdmontonAlberta T6G 2H1Canada

Aims Understanding what drives the variation in species composition and diversity among local communities can provide insights into the mechanisms of community *** ecological traits are often thought to be phylogenetically conserved,there should be patterns in phylogenetic structure and phylogenetic diversity in local communities along ecological *** investigate potential patterns in angiosperm assemblages along an elevational gradient with a steep ecological gradient in Changbaishan,*** We used 13 angiosperm assemblages in forest plots(32×32 m)distributed along an elevational gradient from 720 to 1900 m above sea *** used Faith’s phylogenetic diversity metric to quantify the phylogenetic alpha diversity of each forest plot,used the net relatedness index to quantify the degree of phylogenetic relatedness among angiosperm species within each forest plot and used a phylogenetic dissimilarity index to quantify phylogenetic beta diversity among forest *** related the measures of phylogenetic structure and phylogenetic diversity to environmental(climatic and edaphic)*** Findings Our study showed that angiosperm assemblages tended to be more phylogenetically clustered at higher elevations in *** finding is consistent with the prediction of the phylogenetic niche conservatism hypothesis,which highlights the role of niche constraints in governing the phylogenetic structure of *** study also showed that woody assemblages differ from herbaceous assemblages in several major ***,phylogenetic clustering dominated in woody assemblages,whereas phylogenetic overdispersion dominated in herbaceous assemblages;second,patterns in phylogenetic relatedness along the elevational and temperature gradients of Changbaishan were stronger for woody assemblages than for herbaceous assemblages;third,environmental variables explained much more variations in phylogenetic relatedness,phylogenetic alpha diver

关键词： elevational diversity gradient herbaceous plants net relatedness index phylogenetic alpha diversity phylogenetic beta diversity woody plants

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

Imaging characteristics and surgical management of orbital neurilemmomas

引用

International Journal of Ophthalmology(English edition) 2019年第7期12卷 1108-1115页

作者： Ming-hao Chen jian-Hua Yan The State Key Laboratory of Ophthalmology Zhongshan Ophthalmic CenterSun Yat-sen University

AIM: To review imaging characteristics and surgical outcomes of orbital neurilemmoma. METHODS: Retrospective review of 21 patients with orbital neurilemmoma managed at the Zhongshan Ophthalmic Center of Sun Yat-sen University from June 2005 to December 2016. All patients underwent surgical excision following preoperative imaging including ultrasonography, computed tomography(CT) and magnetic resonance imaging(MRI).RESULTS: Among these patients, 11 were male and 10 were female, with age ranging from 12 to 75y(average, 40.3 y). Ultrasound of the orbit showed a roundish well-demarcated orbital mass with low or middle internal reflectivity in each case. Dark inner liquid fields were detected in 28.6% of these cases. Doppler ultrasound demonstrated blood flow signals in these masses. CT showed that the tumors were either homogeneous or heterogeneous. MRI of T1 WI revealed isointense or hypointense tumors, while the T2 WI indicated heterogeneous hyperintense lesions. Gd contrast MRI demonstrated heterogenous or homogeneous enhancement initiating from the wide area of the lesion. Six patients underwent lateral orbitotomy and 15 anterior orbitotomy. All tumors were completely removed. After a mean followup of 1.8 y, 3 patients experienced reduced vision while the remaining 10 patients showed improved vision after surgery. One patient experienced a mild limitation of upward motility. No recurrence occurred. CONCLUSION: Orbital neurilemmoma is a relatively rare, benign orbital tumor. Effective diagnosis requires a combination of ultrasonography, CT and/or MRI. These imaging techniques are also vital to differentiate neurilemmomas from other orbital masses like that of cavernous hemangiomas and *** treatment requires complete resection of the neurilemmomas as performed either by lateral or anterior orbitotomy. Recurrence is rare after complete removal.

关键词： neurilemmoma orbital tumor imaging orbitotomy orbital surgery

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

Multiple generation effects of high temperature on the development and fecundity of Bemisia tabaci （Gennadius）（Hemiptera Aleyrodidae） biotype B

引用

Insect Science 2013年第4期20卷 541-549页

作者： jian-Ying Guo Lin Cong Fang-hao Wan State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant Protection Chinese Academy of AgriculturalSciences Beijing China

Insects are ectotherms and their ability to resist temperature stress is limited. The immediate effects of sub-lethal heat stress on insects are well documented, but longer- term effects of such stresses are rarely reported. In this study, survival, development and reproduction of the whitefly, Bemisia tabaci （Gennadius）（Hemiptera： Aleyrodidae） biotype B, were compared over five consecutive generations at 27, 31 and 35℃ and for one generation at 37 ℃. Both temperature and generation significantly affected the fitness of the whitefly. These impacts were more dramatic with increasing generations and temperatures. Among the experimental temperatures, the most favorable for development and reproduction were 27 ℃ and 31 ℃. At 27 ℃, survival, development and fecundity were all stable over these five generations. At 31 ℃, immature survival rate was the highest in the fifth generation, but female fecundities decreased in the fourth and fifth generations. At 35 ℃, egg hatching rate, immature survival rate and female fecundity decreased significantly in the fourth and fifth generations. At 37 ℃, survival ofB. tabaci was not adversely affected, but female fecundity at 37 ℃ was less than 10% of that at 27 ℃ or 31 ℃. These results demonstrate that the lethal high temperature for B. tabaci is over 37 ℃, and the whitefly population continued expanding in the five generations at 35 ℃. The ability orB. tabaci biotype B to survive high temperature stress will play an important role in its population extension under global warming.

关键词： Bemisia tabaci biotype B high temperature stress multiple generation ef-fects population expansion

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

Determining dimensionalities and multiplicities of crystal nets

引用

npj Computational Materials 2020年第1期6卷 467-475页

作者： hao Gao Junjie Wang Zhaopeng Guo jian Sun National Laboratory of Solid State Microstructures School of Physics and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

Low-dimensional materials have attracted significant attention over the past *** discover new low-dimensional materials,high-throughput screening methods for structures with target dimensionality have been applied in different materials *** this purpose,the reliability of dimensionality identification is therefore highly *** this work,we find that the existence of self-penetrating nets may lead to incorrect results by previous *** of this,we use the quotient graph to analyse the topologies of structures and compute their dimensionalities.

关键词： methods dimensionality dimensional

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

Non-detection of pulsed radio emission from magnetar Swift J1834.9-0846: constraint on the fundamental plane of magnetar radio emission

引用

Research in Astronomy and Astrophysics 2013年第7期13卷 835-840页

作者： hao Tong jian-Ping Yuan Zhi-Yong Liu Xinjiang Astronomical Observatory Chinese Academy of Sciences

The magnetar Swift J1834.9-0846 is observed using the Nanshan 25 m radio telescope. No pulsed radio emission is detected. The upper limit on the pulsed radio emission from this source is 0.5 mJy. According to the ＂fundamental plane＂ for radio magnetars, this source should have radio emission. Therefore, our results put constraints on the existence of a fundamental plane of magnetar radio emission. We argue that a magnetar＇s ability to emit radio emission may have little to do with the spin down luminosity and is related to the magnetar＇s X-ray luminosity. The only necessary condition is a relatively low X-ray luminosity.

关键词： pulsars: individual (Swift J1834.9-0846) - stars: magnetars - stars:neutron

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

Role of Nitric Oxide Dependence on Nitric Oxide Synthase-like Activity in the Water Stress Signaling of Maize Seedling

引用

Journal of Integrative Plant Biology 2008年第4期50卷 435-442页

作者： Gang-Ping hao Yu Xing jian-Hua Zhang Department of Biological Science Taishan Medical University Taian 271000 China Department of Biology Hong Kong Baptist University Hong Kong China

Nitric oxide （NO） has been known as an important signal in plant antioxidative defense but its production and roles in water stress are less known. The present study investigated whether NO dependence on a NO synthase-like （NOS） activity is involved in the signaling of drought-induced protective responses in maize seedlings. NOS activity, rate of NO release and drought responses were analyzed when NO donor sodium nitroprusside （SNP）, NO scavenger c-PTIO （2-（4-carboxyphenyl）- 4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide） and NOS inhibitor L-NAME （NG-nitro-L-arginine methyl ester） were applied to both detached maize leaves and whole plants. Both NOS activity and the rate of NO release increased substantially under dehydration stress. The high NOS activity induced by c-PTIO as NO scavenger and NO accumulation inhibited by NOS inhibitor L-NAME in dehydration-treated maize seedlings indicated that most NO production under water deficit stress may be generated from NOS-like activity. After dehydration stress for 3 h, detached maize leaves pretreated with NO donor SNP maintained more water content than that of control leaves pretreated with water. This result was consistent with the decrease in the transpiration rate of SNP-treated leaves subjected to drought treatment for 3 h. Membrane permeability, a cell injury index, was lower in SNP-treated maize leaves under dehydration stress for 4 h when compared with the control leaves. Also, superoxide dismutase （SOD） activity of SNP combined drought treatment maize leaves was higher than that of drought treatment alone, indicating that exogenous NO treatment alleviated the water loss and oxidative damage of maize leaves under water deficit stress. When c-PTIO as a specific NO scavenger was applied, the effects of applied SNP were overridden. Treatment with L-NAME on leaves also led to higher membrane permeability, higher transpiration rate and lower SOD activities than those of control leaves, indicating that NOS-like activity

关键词： anti-oxidative defense maize (Zea mays) nitric oxide nitric oxide synthase signal transduction water stress.

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

Coagulopathy and the prognostic potential of D-dimer in hyperlipidemia-induced acute pancreatitis

引用

Hepatobiliary & Pancreatic Diseases International 2015年第6期14卷 633-641页

作者： Ning Yang Dong-Lei Zhang jian-Yu hao Department of Endocrinology Beijing Chaoyang HospitalCapital Medical University Department of Gastroenterology Beijing Chaoyang HospitalCapital Medical University

BACKGROUND： Coagulopathy and its association with disease severity in hyperlipidemia （HL）- and non-hyperlipidemia （NHL）-induced acute pancreatitis （AP） are not dear. The present study was to evaluate the relati... 详细信息

关键词： hyperlipidemia-induced acute pancreatitis coagulation homeostasis D-dimer protein C disease severity

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：