检索结果-南通市图书馆

Quantitative analysis of the protective performance of bicycle helmet with multidirection impact protection system in oblique impact tests

引用

Chinese Journal of Traumatology 2024年第4期27卷 226-234页

作者： Yong Han Hao Yang He Wu Di Pan bing-yu wang School of Mechanical and Automotive Engineering Xiamen University of TechnologyXiamen361024Fujian provinceChina Fujian Key Laboratory of Bus Advanced Design and Manufacturing Xiamen361024Fujian provinceChina School of Aerospace Engineering Xiamen UniversityXiamen361005Fujian provinceChina

Purpose:The current study aimed to assess the protective performance of helmets equipped with multidirectional impact protection system(MIPS)under various oblique impact ***:Initially,a finite element model of a bicycle helmet with MIPS was developed based on thescanned geometric parameters of an actual bicycle ***,the validity of model wasconfirmed using the KASK WG11 oblique impact test *** different impact angles(30°,45°,and 60°)and 2 varying impact speeds(5 m/s and 8 m/s)were employed in oblique tests to evaluateprotective performance of MIPS in helmets,focusing on injury assessment parameters such as peaklinear acceleration(PLA)and peak angular acceleration(PAA)of the ***:The results demonstrated that in all impact simulations,both assessment parameters werelower during impact for helmets equipped with MIPS compared to those *** PAA wasconsistently lower in the MIPS helmet group,whereas the difference in PLA was not significant in the noMIPS helmet *** instance,at an impact velocity of 8 m/s and a 30°inclined anvil,the MIPS helmetgroup exhibited a PAA of 3225 rad/s^(2) and a PLA of 281 *** contrast,the no-MIPS helmet group displayeda PAA of 8243 rad/s^(2) and a PLA of 292 ***,both PAA and PLA parameters decreased with theincrease of anvil *** a 60°anvil angles,PAA and PLA values were 664 rad/s^(2) and 20.7 g,respectively,reaching their ***:The findings indicated that helmets incorporating MIPS offer enhanced protection againstvarious oblique impact *** assessing helmets for oblique impacts,the utilization of larger angleanvils and rear impacts might not adequately evaluate protective performance during an impact *** findings will guide advancements in helmet design and the refinement of oblique impact testprotocols.

关键词： Oblique impact Multi-direction impact protection system WG11 oblique impact test Angular acceleration

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

NUMERICAL SIMULATION OF HYDRODYNAMIC CHARACTERISTICS ON AN ARC CROWN WALL USING VOLUME OF FLUID METHOD BASED ON BFC

引用

Journal of Hydrodynamics 2011年第6期23卷 767-776页

作者： LI Xue-yan REN bing wang Guo yu wang Yong-xue State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116023China

In the present study, a new algorithm based on the Volume Of Fluid （VOF） method is developed to simulate the hydrodynamic characteristics on an arc crown wall. Structured grids are generated by the coordinate transform method in an arbitrary complex region. The Navier-Stokes equations for two-dimensional incompressible viscous flows are discretized in the Body Fitted Coordinate （BFC） system. The transformed SIMPLE algorithm is proposed to modify the pressure-velocity field and a transformed VOF method is used to trace the free surface. Hydrodynamic characteristics on an arc crown wall are obtained by the improved numerical model based on the BFC system （BFC model）. The velocity field, the pressure field and the time profiles of the water surface near the arc crown wall obtained by using the BFC model and the Cartesian model are compared. The BFC model is verified by experimental results.

关键词： Body Fitted Coordinate (BFC) SIMPLE scheme Volume Of Fluid (VOF) method arc crown wall staggered grid

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

Robust TDOA/FDOA estimation from emitter signals for hybrid localization using UAVs

引用

Defence Technology（防务技术） 2022年第1期18卷 81-93页

作者： yu-bing wang Xiao-long Liang Jia-qiang Zhang Bao-xiang Ren Ke Jin Air Trmffic Control and Navigation College Air Force Engineering UniversityXi'anChina Shaanxi Key Labomtory of Meta-synthesis for Electronic&Information System Xi'anChina National Digital Switching System Engineering and Technological Research Center ZhengzhouChina

This paper considers the time difference of arrival(TDOA)and frequency difference of arrival(FDOA)estimation problem for joint localization using unmanned aerial vehicles(UAVs),involving range migration(RM)and Doppler ambiguity within observation interval.A robust estimation method based on interpolation and resampling is ***,the interpolation artificially increases the pulse repetition frequency(PRF).After that,the resampling eliminates the coupling between range frequency and slow ***,a coherent integration step based on inverse discrete Fourier transform(IDFT)is used to achieve parameter estimation and suppress the grating lobes caused by *** proposed method could be efficiently implemented by fast Fourier transform(FFT),inverse FFT(IFFT)and non-uniform FFT(NUFFT)without parameter searching *** experiments indicate that the proposed method has nearly optimal anti-noise performance but much lower computational complexity than the maximum likelihood estimator,which makes it more competitive in practical applications.

关键词： TDOA FDOA Parameter estimation Doppler ambiguity Hybrid localization

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

HEAT KERNEL ON RICCI SHRINKERS(II)

引用

Acta Mathematica Scientia 2024年第5期44卷 1639-1695页

作者： yu LI bing wang Institute of Geometry and Physics University of Science and Technology of ChinaHefei230026China Hefei National Laboratory Hefei230088China

This paper is the sequel to our study of heat kernel on Ricci shrinkers[29].In this paper,we improve many estimates in[29]and extend the recent progress of Bamler[2].In particular,we drop the compactness and curvature boundedness assumptions and show that the theory of F-convergence holds naturally on any Ricci flows induced by Ricci shrinkers.

关键词： Ricci flow Ricci shrinker heat kernel

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

Economic burden and influencing factor analysis of outpatients with epilepsy: A cross-sectional study in Shanghai,Shanxi and Sichuan

引用

Asian Pacific Journal of Tropical Medicine 2018年第1期11卷 82-88页

作者： bing-yu wang Yang-Mu Huang Shi-Chuo Li Yan Guo School of Public Health Peking University China Association Against Epilepsy

Objective: To better understand the economic burden of patients with epilepsy receiving outpatient services in China and to analyze potential factors influencing epileptic economic burden through a cross-sectional study. Methods: Using a self-designed questionnaire, we collected information retrospectively from 754 patients with epilepsy evaluated in neurology clinics in Shanghai Municipality, Shanxi Province and Sichuan Province. Descriptive analyses were used after cost variables were presented as logarithms, and multiple linear regressions were performed to explore influencing factors. Results: Fifty percent of the investigated patients experienced an epilepsy attack before the age of 15, and 51.3% had suffered from epilepsy for more than five years. In the past year, 87.9% of patients had visited different hospitals multiple times for evaluation(40.3%) and maintenance treatment(40.7%). The total economic burden of epilepsy was US$ 1143.2. The average direct economic burden and indirect economic burden were US$ 939.0 and US$ 110.2, respectively. Multiple linear regressions showed that patients had to bear greater economic burden if they were hospitalized,using multiple antiepileptic drugs, experiencing illness for less than 5 years, in severe seizure index or active epilepsy with drug resistance, which was statistically significant. Totally only14.3% of patients could get reimbursement in outpatient services. Conclusions: Patients with epilepsy must present to hospitals regularly for satisfactory prognosis, which results in economic burden. Patients bear greater economic burden, especially direct medical costs, if they are newly diagnosed, experience severe seizures, or undergo multiple drug treatments that require more frequent monitoring. However, current insurance policy for outpatient services do not help reduce economic burden of patients efficiently.

关键词： Epilepsy Outpatients Economic Burden Influencing Factors Insurance China

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

Recent advances in FeCl_(3)-photocatalyzed organic reactions via hydrogen-atom transfer

引用

Chinese Chemical Letters 2024年第9期35卷 32-40页

作者： Xiao-Ya yuan Cong-Cong wang bing yu Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450001China National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass Nanjing Forestry UniversityNanjing 210037China

In recent years,FeCl_(3)-photocatalyzed direct C–H/Si–H bond functionalization reactions have attracted huge *** those transformations,chlorine radical(Cl·)could be generated from FeCl_(3)via a ligandto-metal charge transfer(LMCT)/homolysis process under light *** resulting chlorine radical subsequently acts as a hydrogen atom transfer(HAT)agent to abstract the hydrogen atom of aliphatic C–H,O–H,or Si–H bonds to give the corresponding C/Si/O-centered radicals for various organic *** this review,we summarized the recent advances in the application of FeCl_(3)as a HAT photocatalyst for the C/Si–H functionalization to construct C–C,C–N,C–Si,C–S,C–B,and C-P bonds.

关键词： FeCl_(3) Photocatalysis Ligand-to-metal charge transfer Hydrogen atom transfer Chlorine radical

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

Effect of electrical parameters and slag system on macrostructure of electroslag ingot

引用

China Foundry 2024年第1期21卷 44-50页

作者： bing-jie wang yu wang Meng-jun wang Lei Zhao Li-zhong Chang Xiao-fang Shi School of Metallurgy engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina

To investigate the influence of electric parameters and slag system on the solidification quality of electroslag ingot during electroslag remelting,different power supply modes,current strengths and remelting slag systems were used to conduct electroslag remelting experiments on 304L austenitic stainless steel,and the macrostructure of electroslag ingots was *** results indicate that the depth of the metal pool decreases with the reduction of remelting frequency in the low frequency power supply *** effects of different power supply modes,such as low-frequency,direct current straight polarity(DCSP),and direct current reverse polarity(DCRP),on reducing the depth of the metal pool increase in that *** reducing the remelting current strength in the same power supply mode,the depth of metal pool is *** compared to the binary slag system of 70%CaF2+30%Al2O3,the ternary slag system of 60%CaF2+20%Al2O3+20%CaO is more effective in reducing the depth of the metal pool during *** the 60%CaF2+20%Al2O3+20%CaO ternary slag system results in a shallower and flatter metal pool,with columnar crystal growth occurring closer to the axial *** effect is observed for both low frequency and direct current(DC)power supply modes.

关键词： electroslag remelting frequency slag system solidification quality

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

Molecularly imprinted sensor based on carboxylated carbon nanotubes/Keggin-type polyoxometalates nanocomposite for the detection of furazolidone

引用

Tungsten 2024年第2期6卷 394-409页

作者： yu-Lan Huang bing Zhang yu-Lian Li Li wang Le Dong Jian Li College of Ocean Food and Biological Engineering Jimei UniversityXiamen 361021China College of Oceanology and Food Science Quanzhou Normal UniversityQuanzhou 362000China

Due to its properties of mutagenic,teratogenic,and carcinogenic,the detection of furazolidone(FZD)in aquaculture is of great importance for food safety and human *** this study,molecularly imprinted fi lms modifi ed with carboxylated multi-walled carbon nanotube-phosphomolybdic acid composite were used to fabricate an electrochemical sensor for the determination of *** nanocomposites were characterized using infrared spectroscopy,scanning electron microscopy,energy-dispersive X-ray spectroscopy,and X-ray diff *** electrochemical characteristics of the modifi ed electrodes were examined using electrochemical impedance spectroscopy,cyclic voltammetry,and diff erential pulse *** sensor exhibited exceptional catalytic *** calibration curves were acquired in the concentration range of 6 nmol·L^(−1)to 0.6μmol·L^(−1),with a limit of detection of 3.38 nmol·L^(−1).Additionally,the sensor proved successful in recognizing FZD in shrimp samples with satisfactory recoveries and *** method provides a strategy to construct a molecularly imprinted electrochemical sensing platform using nanomaterials,which has great promise in the field of food safety.

关键词： Phosphomolybdate Furazolidone Polyoxometalates Carboxylated multi-walled carbon nanotube Molecularly imprinted polymers Electrochemical sensor

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

Investigation of the active ingredients and mechanism of Shuangling extract in dextran sulfate sodium salt induced ulcerative colitis mice based on network pharmacology and experimental verification

引用

Journal of Traditional Chinese Medicine 2024年第3期44卷 478-488页

作者： CHU Mengzhen wang yu LIN Zhijian Lyu Jintao ZHANG Xiaomeng ZHANG bing Department of Clinical Chinese Pharmacy School of Chinese Materia MedicaBeijing University of Chinese MedicineBeijing 102488China

OBJECTIVE: To explore the pharmacodynamic effects and potential mechanisms of Shuangling extract against ulcerative colitis(UC). METHODS: The bioinformatics method was used to predict the active ingredients and action targets of Shuangling extract against UC in mice. And the biological experiments such as serum biochemical indexes and histopathological staining were used to verify the pharmacological effect and mechanism of Shuangling extract against UC in mice. RESULTS: The Shuangling extract reduced the levels of seruminterleukin-1β(IL-1β), tumor necrosis factor-α(TNF-N), interleukin-6(IL-6) and other inflammatory factors in UC mice and inhibited the inflammatory response. AKT Serine/threonine Kinase 1 and IL-6 may be the main targets of the anti-UC action of Shuangling extract, and the TNF signaling pathway, Forkhead box O signaling pathway and T-cell receptor signaling pathway may be the main signaling pathways. CONCLUSION: The Shuangling extract could inhibit the inflammatory response induced by UC and regulate intestinal immune function through multiple targets and multiple channels, which provided a new option and theoretical basis for anti-UC.

关键词： colitis ulcerative pharmacodynamic study network pharmacology molecular docking simulation Shuangling extract

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

Toward Artificial Peptide Nanocapsules

引用

Nano-Micro Letters 2024年第10期16卷 240-243页

作者： yuan wang bing Chen Laboratory for Biomaterials and Drug Delivery Department of AnesthesiologyDivision of Critical Care MedicineBoston Children's HospitalHarvard Medical SchoolBostonMA 02115USA College of Electronic and Optical Engineering and College of Flexible Electronics(Future Technology) Nanjing University of Posts and TelecommunicationsNanjing 210023People's Republic of China

HIGHLIGHTS The formation of peptide nanocapsules is facilitated by a gradient interface,where the differential solvent concentration drives the peptides to preferentially localize and *** peptide nanocapsules,characterized by their hollow structures,demonstrated potential as carriers for targeted drug delivery.1 Introduction Peptide nanocapsules are a type of nanoscale delivery system that encapsulates active substances within a shell composed of peptides,leveraging the unique properties of peptides such as biocompatibility and biodegradability[1].Historically,the development of peptide nanocapsules was inspired primordially by the natural biological processes.

关键词： Peptide nanocapsules Self-assembly Drug delivery Nanomedicine

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：