检索结果-南通市图书馆

Thickness and sp3 bond modulation of（Ti/tetrahedral amorphous carbon）_n multilayer coatings

在线全文

学校读者我要写书评

暂无评论

Tungsten 2025年第1期 152-160页

作者： Zhi-Jun Xie Jia-lin Li ling Gong Xiang-Li zhong Hong-Jia Song jin-Bin Wang National-Provincial Laboratory of Special Function Thin Film Materials School of Materials Science and Engineering Xiangtan University

The durability of wear-resistant tetrahedral amorphous carbon（ta-C） coatings is intimately linked to their thickness and the concentration of *** enhance the lifespan of the coatings,we have prepared a multilayer coating consisting of alternating layers of Ti and ta-C,denoted as（Ti/ta-C）_n,using arc ion plating.A multi-layer structure in conjunction with stage cooling is employed to enhance the thickness and promote *** results indicate that the ID/IGvalue,representing the ratio of the intensity of the D peak to that of the G peak in Raman spectroscopy,decreases from 0.85 when no stage cooling is applied to 0.35 when stage cooling is employed,suggesting an enhancement in the fraction of sp3bonds within the *** obtained（Ti/ta-C）_n multilayer coating without peeling off has a maximum thickness of 1.14 μm,which is almost double that of the ta-C coating single layer *** the same time,the coating has a low coefficient of friction,down to 0.069,and maintains excellent friction properties with a wear rate of 3.4×10-6mm3·N-1·*** results conclusively show that the preparation technology can enhance both thickness and sp3bonding in ta-C coatings,significantly expanding their utility across tools,molds,and precision engineering components.

关键词：

蒙特卡罗方法研究皮肤组织光学特性参数对光子传输的影响

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国激光医学杂志 2017年第1期26卷 7-11,56,57页

作者：肖郑颖林金忠李阳娟莆田学院机电工程学院莆田市351100

目的研究皮肤组织光学特性参数对光子传输的影响。方法根据皮肤组织的结构,构建五层皮肤组织模型。利用蒙特卡罗方法模拟无限细光束在皮肤组织中的传输,逐层改变各光学特性参数,比较吸收能量密度、光能流率、漫反射率的变化。结果增大... 详细信息

目的研究皮肤组织光学特性参数对光子传输的影响。方法根据皮肤组织的结构,构建五层皮肤组织模型。利用蒙特卡罗方法模拟无限细光束在皮肤组织中的传输,逐层改变各光学特性参数,比较吸收能量密度、光能流率、漫反射率的变化。结果增大某一层吸收系数,该层皮肤组织的吸收能量密度增大,光能流率降低,浅层漫反射率略有减小,三者衰减梯度均增大;减小某一层散射系数或增大该层各向异性因子,吸收能量密度减小,吸收能量密度和光能流率的衰减梯度均明显减小;浅层漫反射率略有减小,衰减梯度增大;改变越深层皮肤的光学特性参数对光子传输的影响越小。结论漫反射率受各光学特性参数变化影响较小,吸收能量密度和光能流率则有较明显改变。

关键词：组织光学蒙特卡罗模拟吸收能量密度光能流率漫反射率

铝硅合金表面复合化学镀(Ni-B)-SiC的研究

在线全文

学校读者我要写书评

暂无评论

表面技术 2005年第4期34卷 45-47页

作者：林中进朱有兰黄伟新广东工业大学材料与能源学院广东广州510643

研究了在铝合金(LG12)表面上复合化学镀(Ni-B)-SiC镀层工艺,对影响镀层镀速的几大因素进行了探讨,确定在铝硅合金上复合化学镀(Ni-B)-SiC的最佳工艺及相关参数。同时对该工艺下获得的复合镀层结构性能进行了研究。结果表明,分散相SiC的... 详细信息

研究了在铝合金(LG12)表面上复合化学镀(Ni-B)-SiC镀层工艺,对影响镀层镀速的几大因素进行了探讨,确定在铝硅合金上复合化学镀(Ni-B)-SiC的最佳工艺及相关参数。同时对该工艺下获得的复合镀层结构性能进行了研究。结果表明,分散相SiC的嵌入基本没有改变Ni-B基质合金原有的非晶结构。450℃热处理后,复合镀层向晶体结构转变,镀层硬度值HV14737,达到最大。

关键词： LG12合金复合化学镀 (Ni-B)-SiC

光子—光子散射振幅的规范不变性问题与维数正规化

在线全文

学校读者我要写书评

暂无评论

厦门大学学报(自然科学版) 1980年第1期 19-23页

作者：林仲金彭宏安厦门大学物理系北京大学物理系

应用维数正规化的方法,得到四秩光子—光子散射张量在k1=k2=k3=k4=0时的表达式与通常正规化的结果是一致的。

关键词：光子规范不变性表达式玻色子散射张量散射振幅维数

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

暗纹东方鲀集约化养殖技术研究

莆田学院学报 2005年第2期12卷 23-26页

作者：林金忠肖懿哲傅美兰林炫锋莆田市水产科学研究所福建莆田351100

阐述暗纹东方鲀集约化养殖试验过程。通过2年重复试验,掌握了一整套养殖技术,经过一年多的养殖,培育出的鱼种平均成活率达92.16%,商品鱼平均成活率达83.8%,平均每平方米产鱼3.77公斤,投入产出比1:2.1。

关键词：集约化养殖技术暗纹东方鲀投入产出比试验过程重复试验成活率平均商品鱼平方米鱼种鲍

在线全文

学校读者我要写书评

暂无评论

无线电能传输系统的阻抗匹配研究

测控技术 2017年第10期36卷 131-133,137页

作者：铁林忠黄劲松高婷吴琨辽宁工程技术大学电气与控制工程学院辽宁葫芦岛125105 辽宁工程技术大学软件学院辽宁葫芦岛125105 国网锦州供电公司辽宁锦州121000

近年来,磁耦合谐振式无线电能传输系统在各个领域得到了广泛应用。针对无线电能传输系统工作过程中,传输距离改变导致电能传输效率显著下降的问题,提出一种在无线电能传输系统接收端通过阻抗转换,得到负载端的等效阻抗,进行阻抗匹配的方... 详细信息

近年来,磁耦合谐振式无线电能传输系统在各个领域得到了广泛应用。针对无线电能传输系统工作过程中,传输距离改变导致电能传输效率显著下降的问题,提出一种在无线电能传输系统接收端通过阻抗转换,得到负载端的等效阻抗,进行阻抗匹配的方法,使系统在传输距离改变和负载变化时,电能传输效率上下波动减小,达到高频信号从发射端到接收端的高效传输、减少信号反射的目的。通过ADS软件仿真验证,这种方法能使系统在传输距离发生微小变化的情况下,传输效率得到提高。

关键词：磁耦合谐振阻抗匹配阻抗转换

Fine-tuning the spatial allocation of phytohormones for smart canopy, smart breeding, and smart agriculture

在线全文

学校读者我要写书评

暂无评论

Science China Life Sciences 2025年第1期 309-310页

作者： Tao Zhou lin Li National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural University HuBei HongShan Laboratory

The dual challenges of global climate change and population growth have increased demand for higher crop yields per unit area. The innovative technology of smart agriculture aims to synergize breeding, cultivation, and production through the application of biological and informatics technologies. Historically, the “Green Revolution” introduced semidwarf varieties of certain key crops by utilizing mutations affecting gibberellin pathways, which significantly increased planting densities and yields.

关键词：

同方期刊数据库

Interannual variability of boreal summer intraseasonal oscillation over the northwestern Pacific influenced by the Pacific Meridional Mode

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2025年第1期18卷 6-11页

作者： Haoyu Zhou Pang-Chi Hsu lin Chen Yitian Qian Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environmental Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science and TechnologyNanjingChina

During the boreal summer,intraseasonal oscillations exhibit significant interannual variations in intensity over two key regions:the central-western equatorial Pacific(5°S-5°N,150°E-150°W)and the subtropical Northwestern Pacific(10°-20°N,130°E-175°W).The former is well-documented and considered to be influenced by the ENSO,while the latter has received comparatively less attention and is likely influenced by the Pacific Meridional Mode(PMM),as suggested by partial correlation analysis *** elucidate the physical processes responsible for the enhanced(weakened)intraseasonal convection over the subtropical northwestern Pacific during warm(cold)PMM years,the authors employed a moisture budget *** findings reveal that during warm PMM years,there is an increase in summer-mean moisture over the subtropical northwestern *** increase interacts with intensified vertical motion perturbations in the region,leading to greater vertical moisture advection in the lower troposphere and consequently resulting in convective *** a process is pivotal in amplifying intraseasonal convection *** observational findings were further verified by model experiments forced by PMM-like sea surface temperature patterns.

关键词： Boreal summer intraseasonal oscillation Interannual variability Pacific Meridional Mode Moisture budget analysis

Solid-liquid flow characteristics and sticking-force analysis of valve-core fitting clearance

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第12期24卷 1096-1105页

作者： jin-yuan QIAN Jiaxiang XU Fengping zhong Zhenhao lin Tingfeng HUA Zhijiang jin Institute of Process Equipment College of Energy EngineeringZhejiang UniversityHangzhou 310027China Zhejiang Academy of Special Equipment Science Hangzhou 310009China Institute of Wenzhou Zhejiang UniversityWenzhou 325036China

External contamination particles or wear particles corroded by a valve body are mixed into the fluid. As a result, when the fluid enters the fitting clearance of the valve core, it can cause an increase in resistance and lead to sticking failure of the valve core. This paper analyzes solid-liquid flow characteristics in fitting clearances and valve-core sticking based on the Euler-Euler model, using a typical hydraulic valve as an example. The impact of particle concentration and diameter on flow characteristics and valve-core sticking force was analyzed. The highest volume fraction of particles was in the pressureequalizing groove(PEG), with peak values increasing as the particle diameter increased. The sticking force increased with increasing particle concentration. When the particle diameter was 12 μm, the sticking force was the largest, making this the sensitive particle diameter. Particle distribution and valve-core sticking force were compared for oval, rectangular, and triangular PEGs. The fluid-deflection angles in oval and rectangular PEGs were larger, and their values were 32.83° and 39.15°, respectively. The fluid-deflection angle in the triangular PEG was relatively small, less than 50% that of the oval or rectangular PEGs. The particle-volume-fraction peaks in oval, rectangular, and triangular PEGs were 0.0317, 0.0316, and 0.0312, respectively. The sticking forces of oval, rectangular, and triangular PEGs were 4.796, 4.802, and 4.757 N, respectively when the particle diameter was 12 μm. This work provides a reference for design and research aimed at reducing valve-core sticking.

关键词： Solid-liquid flow characteristics Valve core Sticking force Euler-Euler model