检索结果-南通市图书馆

The Improvement of 3D wireless sensor network nodes localization

在线全文

学校读者我要写书评

暂无评论

The Improvement of 3D wireless sensor network nodes localiza...

INTEGRAL ANALYSIS ON INTERACTION OF DUAL-JET FLOW

第26届中国控制与决策会议

作者： li-jun Peng wen-wei li College of Information Science and Engineering Hunan University

ISBN: (纸本)9781479937097

Node localization of wireless sensor network is a hot topic, but current algorithms of 3D wireless sensor node localization are not accurate enough. In this paper, the DR-MDS algorithm is proposed, DR-MDS algorithm mainly calibrates the coordinates of nodes and the ranging of nodes based on multidimensional scaling, it calculates the distance between any nodes exactly according to the hexahedral measurement, introducing a modification factor to calibrate the measuring distance by Received Signal Strength Indicator（RSSI）. Results of simulation show that DR-MDS algorithm has significant improvement in localization accuracy compare with MDS-MAP algorithm.

关键词： Wireless sensor networks Distance correction Node localization Localization accuracy

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

Journal of Hydrodynamics 1993年第4期5卷 31-36页

作者： Huai wen-xin li wei Wuhan University of Hydraulic & Electric Engineering,Wuhan,Hubei 430072,P.R.China

This work reports the analysis of the flow characteristics of two plane,parallel jets that merge as they issue into stagnant *** predicted results based on a simple integral analysis of the flowfield are compared with the experimental *** shows that the simple analysis predicts the major variables of the dual-jet reasonably well and the spreading parameter σ=15 for plane dual-jet.

关键词： integral method dual-jet flow Coanda effect

Porous Organic Cage‑Based Quasi‑Solid‑State Electrolyte with Cavity‑Induced Anion‑Trapping Effect for Long‑life lithium Metal Batteries

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 376-386页

作者： wei-Min Qin Zhongliang li wen‑Xia Su Jia‑Min Hu Hanqin Zou Zhixuan Wu Zhiqin Ruan Yue‑Peng Cai Kang li Qifeng Zheng School of Chemistry South China Normal UniversityGuangzhou 510006People’s Republic of China Key Laboratory of Functional Metal‑Organic Compounds of Hunan Province College of Chemistry and Material ScienceHengyang Normal UniversityHengyang 421008People’s Republic of China Guangzhou Key Laboratory of Energy Conversion and Energy Storage Materials Guangzhou 510006People’s Republic of China

Porous organic cages(POCs)with permanent porosity and excellent host–guest property hold great potentials in regulating ion transport behavior,yet their feasibility as solid-state electrolytes has never been testified in a practical ***,we design and fabricate a quasi-solid-state electrolyte(QSSE)based on a POC to enable the stable operation of li-metal batteries(LMBs).Benefiting from the ordered channels and cavity-induced anion-trapping effect of POC,the resulting POC-based QSSE exhibits a high li+transference number of 0.67 and a high ionic conductivity of 1.25×10^(−4) S cm^(−1) with a low activation energy of 0.17 *** allow for homogeneous li deposition and highly reversible li plating/stripping for over 2000 *** a proof of concept,the LMB assembled with POC-based QSSE demonstrates extremely stable cycling performance with 85%capacity retention after 1000 ***,our work demonstrates the practical applicability of POC as SSEs for LMBs and could be extended to other energy-storage systems,such as Na and K batteries.

关键词： Porous organic cage Cavity-induced anion-trapping Quasi-solid-state electrolyte Homogeneous li+flux lithium metal battery

在线全文

学校读者我要写书评

暂无评论

曲线坐标系下平面二维浅水模型的修正与应用

计算力学学报 2007年第1期24卷 103-106页

作者：魏文礼刘哲西安理工大学水利水电学院西安710048 交通部天津水运工程科学研究所天津300456

借鉴有关弯道水流流速分布的研究成果,计入弯道环流引起的横向的动量交换,对曲线坐标系平面二维浅水方程做了修正;采用边界处正交的曲线网格生成技术,处理复杂的计算区域边界。采用修正后的模型对90°弯道水流进行了数值模拟,并与原模... 详细信息

借鉴有关弯道水流流速分布的研究成果,计入弯道环流引起的横向的动量交换,对曲线坐标系平面二维浅水方程做了修正;采用边界处正交的曲线网格生成技术,处理复杂的计算区域边界。采用修正后的模型对90°弯道水流进行了数值模拟,并与原模型的计算结果及实测资料进行了比较,结果表明该模型能够有效地模拟流线弯曲的复杂水流的水力特性。

关键词：边界拟和坐标技术横向动量交换数值模拟二次流

在线全文

学校读者我要写书评

暂无评论

自动铺缠预浸带热压接研究

材料工程 2014年第5期42卷 7-11页

作者：严飙文立伟南京航空航天大学机电学院南京210016 南京航空航天大学材料科学与技术学院南京210016

应用流体力学理论获得了热压接模型,研究续接压力、温度、时间等因素对续接性能的影响。采用玻璃纤维织物/酚醛树脂预浸带(664/B30)进行续接实验验证。结果表明:随续接压力增大、温度升高以及续接时间和长度的增加预浸带续接性能提高,... 详细信息

应用流体力学理论获得了热压接模型,研究续接压力、温度、时间等因素对续接性能的影响。采用玻璃纤维织物/酚醛树脂预浸带(664/B30)进行续接实验验证。结果表明:随续接压力增大、温度升高以及续接时间和长度的增加预浸带续接性能提高,符合理论分析结果。

关键词：预浸带快速热压接流体力学浸润效应拉伸破坏载荷

Differential distribution of PINK1 and Parkin in the primate brain implies distinct roles

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第4期20卷 1124-1134页

作者： Yanting liu wei Huang Jiayi wen Xin Xiong Ting Xu Qi Wang Xiusheng Chen Xianxian Zhao Shihua li Xiaojiang li weili Yang Guangdong Key Laboratory of Non-human Primate Research Key Laboratory of CNS Regeneration(Ministry of Education)Guangdong-Hongkong-Macao CNS Regeneration Institute of Jinan UniversityJinan UniversityGuangzhouGuangdong ProvinceChina

The vast majority of in vitro studies have demonstrated that PINK1 phosphorylates Parkin to work together in mitophagy to protect against neuronal ***,it remains largely unclear how PINK1 and Parkin are expressed in mammalian *** has been difficult to address because of the intrinsically low levels of PINK1 and undetectable levels of phosphorylated Parkin in small *** this issue is critical for elucidating the in vivo roles of PINK1 and ***,we showed that the PINK1 kinase is selectively expressed as a truncated form(PINK1–55)in the primate *** the present study,we used multiple antibodies,including our recently developed monoclonal anti-PINK1,to validate the selective expression of PINK1 in the primate *** found that PINK1 was stably expressed in the monkey brain at postnatal and adulthood stages,which is consistent with the findings that depleting PINK1 can cause neuronal loss in developing and adult monkey ***1 was enriched in the membrane-bound fractionations,whereas Parkin was soluble with a distinguishable *** double staining experiments showed that PINK1 and Parkin did not colocalize under physiological conditions in cultured monkey astrocytes,though they did colocalize on mitochondria when the cells were exposed to mitochondrial *** findings suggest that PINK1 and Parkin may have distinct roles beyond their well-known function in mitophagy during mitochondrial damage.

关键词： neurodegeneration Parkin Parkinson’s disease PINK1 subcellular distribution

Double-balloon enteroscopy reliably directs surgical intervention for patients with small intestinal bleeding

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第12期14卷 1936-1940页

作者： Mou-Bin lin Lu Yin Jian-wen li wei-Guo Hu Qian-Jian Qian Department of Surgery Ruijin Hospital Shanghai 200025China

AIM: To evaluate preoperative double-balloon enteroscopy for determining bleeding lesions of small intestine, thus directing selective surgical intervention. METHODS: We retrospectively reviewed 56 patients who underwent double-balloon enteroscopy to localize intestinal bleeding prior to surgical intervention, and compared enteroscopic findings with those of intraoperation to determine the accuracy of enteroscopy in identifying and localizing the sites of small intestinal bleeding. RESULTS: Double-balloon enteroscopy was performed in all 56 patients in a 30-mo period. A possible site of blood loss was identified in 54 (96%) patients. Enteroscopy provided accurate localization of the bleeding in 53 (95%) of 56 patients, but failed to disclose the cause of bleeding in 4 (7%). There was one case with negative intraoperative finding (2%). Resection of the affected bowel was carried out except one patient who experienced rebleeding after operation. Gastrointestinal stromal tumor (GIST) was most frequently diagnosed (55%). CONCLUSION: Double-balloon enteroscopy is a safe, reliable modality for determining bleeding lesion of small intestine. This technique can be used to direct selective surgical intervention.

关键词： Double-balloon enteroscopy Small intestinebleeding Surgery

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

分岔管道三维湍流水力特性数值模拟

水利学报 2010年第4期40卷 398-405页

作者：戎贵文魏文礼刘玉玲西安理工大学水利水电学院陕西西安710048 安徽理工大学地球与环境学院安徽淮南232001

建立了分岔管道水动力学的计算模型,求解三维贴体坐标系下水流控制方程。计算中采用修正的k-ε湍流模型,应用有限体积法离散方程,物理变量采用同位网格布置,控制体表面上各变量的值用界面动量插值法计算,速度-压力耦合计算采用SIMPLEC... 详细信息

建立了分岔管道水动力学的计算模型,求解三维贴体坐标系下水流控制方程。计算中采用修正的k-ε湍流模型,应用有限体积法离散方程,物理变量采用同位网格布置,控制体表面上各变量的值用界面动量插值法计算,速度-压力耦合计算采用SIMPLEC算法。本文应用该数值模型模拟了三维弯道水流的水力特性,并与模型试验实测值进行了比较,结果吻合较好。最后应用该数值模型预测了35°分岔管道连接区域三种流动情况的水力特性。

关键词：分岔管道坐标变换动量插值三维模型

Total laparoscopic radical trachelectomy with ascending branches of uterine arteries preservation

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2011年第3期124卷 469-471页

作者： WANG Yi-feng CHEN Gao-wen li wei-shu wenG Hui-nan LU Xiao-gang Department of Obstetrics and Gynecology Third Affiliated Hospital of Guangzhou Medical College Guangzhou Guangdong 510150 China

Radical trachelectomy （RT） is a fertility-sparing treatment for young women with early-stage cervical cancer. We report here a case of a 30-year-old nulliparous woman who presented with stage IA2 cervical squamous cancer. She was treated with total laparoscopic radical trachelectomy （TLRT） and laparoscopic pelvic lymphadenectomy （LPL）. During this procedure, the ascending branches of uterine arteries were preserved. No metastasis was identified after fourteen months of follow-up. The menstrual pattern normalized and the patient has been attempting to conceive for two *** might be a safe fertility-preserving procedure for early-stage cervical cancer, due to its minimally invasive nature and shorter recovery time. However, more data are required on recurrence rate, fertility rate and pregnancy outcome in order to fully evaluate the therapeutic efficacy of TLRT.

关键词： cervical cancer radical trachelectomy pelvic lymphadenectomy laoaroscopy fertility