Bibliometric trend analysis on global graphene research

Graphene is a rising star as one of the promising materials with many applications. Its global literature increased fast in recent years. In this work, bibliometric analysis and knowledge visualization technology were applied to evaluate global scientific production and developing trend of graphene research. The data were collected from 1991 to 2010 from the Science Citation Index database, Conference Proceeding Citation Index database and Derwent Innovation Index database integrated by Thomson Reuters. The published papers from different subjects, journals, authors, countries and keywords distributed in several aspects of research topics proved that graphene research increased rapidly over past 20 years and boosted in recent 5 years. The distinctions in knowledge map show that the clusters distributed regularly in keywords of applied patents in recent 5 years due to the potential applications of graphene research gradually found. The analytical results provided several key findings of bibliometrics trend

Application of Multi-Task System Based on MCS-51 in Intelligent Security System

通过一个智能安防系统的应用实例,介绍了一种采用MCS-51单片机程序实现多任务机制的简单方法,并给出了源代码。采用中断进行实时任务切换,具有结构简单清晰、代码量少、不需使用汇编语言等优点。该方法亦可应用于其他单片机系统。A multi-task system based on MCS-51 was introduced, and an example for practical application of intelligent security system was presented. The real time task exchange is based on interrupt .The system is compact and convenient for application,which is programed without assemble language. The method is also available for the other MCU system

一种新型核级FeCrAl合金的离子辐照行为

采用400 keV的Fe+离子在400℃下对一种新型核级Fe13Cr4Al合金进行了辐照,利用透射电镜（TEM）和纳米显微硬度仪分析及测试了其辐照前后的微观结构和硬度值。结果表明:Fe+离子辐照在合金基体中形成了大量位错环而未形成明显尺寸的空位团。随辐照剂量的增加,位错环尺寸不断增大,位错环体密度先增加,后趋于饱和,数值稳定在3.1×1022 /m3。辐照未使合金基体非晶化,但导致Laves析出相发生非晶化转变。随辐照剂量的增加,析出相中Nb、Mo、Ta和Cr 4种元素的含量呈减少趋势,而Si的含量却逐渐增加。在60～100 nm深度范围发生明显辐照硬化现象,临界深度值hc=100 nm。辐照硬化值与辐照剂量呈幂函数关系:ΔHIrr=0.4288（d）0.2311;而与微观组织参量（ND）0.5呈正相关:ΔHIrr=55.36（ND）0.5。国家自然科学基金(U1867201,U1832112);;\n厦门大学能源学院发展基金(2018NYFZ01

Local Interconnect Network Bus and Its Application in Control System of Smart Home

介绍了LIN总线协议,及其在智能家居控制系统中的应用。LIN总线是新近出现在汽车行业的一种串行通信总线,其协议对硬件的依赖程度低,可基于普通单片机的通用串口等硬件资源以软件方式实现,成本低廉,可广泛应用于汽车行业以外对实时性要求不高的其他领域。利用LIN总线在智能家居系统中构建内部网络,以实现对各电器节点的控制,相较于传统控制方式具有诸多优势,将更为用户所接受。The LIN bus protocol and its application in controlling system of the smart home were introduced.The LIN bus is a new serial communication bus,which is emerging in existing automotive industry with features of protocol less depend upon hardware,implementing low cost software model by using hardware source of standard UART/SCI interface of simple MCU,widely used in other fields with less real time demand etc..Using LIN bus to build internal network of the smart home and implement controlling node of every electrical apparatus will be well received by users for many advantages over the conventional controlling mode

LIN总线及其在智能家居控制系统中的应用

LIN总线是新近出现在汽车行业的一种串行通信总线。其协议对硬件的依赖程度低,可以基于普通单片机的通用串口等硬件资源以软件方式实现,成本低廉,因此可广泛应用于汽车行业以外对实时性要求不高的其他领域。本文概要介绍了LIN总线协议,并介绍了其在智能家居控制系统中的应用

Intelligent and exact ergo meter based on ADS1100

文中介绍基于串行A/D转换器ADS1100的新型高精度智能测力计的开发,阐述它的硬件结构和软件程序。该测力计将作用于传感器的力转换成电压值,经A/D转换后用单片机进行处理,其结果通过LCD显示,并具有超荷报警、电压欠压报警、掉电进入低功耗模式等功能。This article introduces a novel intelligent and exact ergometer based on ADS1100,which is a serial A/D converter.The hardware structure and software flow of the meter is emphasized.The principle of ergometer is conversion of the power act on sensor to voltage value which is dealt with by MCU and display by LCD.It also has many functions,include alarm when overload or fall short of voltage and enter the mode of low power-consumption

Classification of Panax Quinquefolium.L Samples by Cluster Analysis

建立西洋参药材分类方法;分别采用电感耦合等离子体质谱(ICP-MS)法、高效液相色谱(HPLC)法以及蒽酮-硫酸分光光度法,对12个西洋参样品中的15种无机元素、7种人参皂苷和多糖进行测定,用SPSS聚类分析法对12个西洋参样品进行聚类分析;结果表明:以4种不同的聚类变量进行聚类分析,其聚类分组结果并不一致,将几种有效成分综合为聚类变量,对西洋参进行分类更为科学合理;聚类分析法是西洋参分类分析的有效方法,对西洋参品种与质量的鉴定有一定的理论意义和实用价值。A classification method was developed for the quality assessment of Panax Quinquefolium.L.The contents of fifteen elements,seven ginsenosides and polysaccharide in twelve Panax Quinquefolium.L samples were determined by ICP-MS,HPLC and anthrone-sulfuric acid spectrophotometry,respectively.The cluster analysis was applied for the classification of 12 Panax Quinquefolium.L samples.The analysis results showed that the classified results were different with different cluster variables and it was found more reasonable to integrate several active components as cluster variables for the classification.The cluster analysis was useful for the classification of Panax Quinquefolium.L

凝胶推进剂模拟液静电雾化行为规律研究

针对凝胶推进剂雾化困难的问题,引入静电喷射技术雾化凝胶推进剂。以水凝胶模拟液为介质,探究静电雾化技术的可行性及试验条件,当收集距离2~5 cm、供液速率10~30μL/h时,凝胶模拟液可实现稳定雾化,收集液滴直径小于100μm,散射角分布在8°~36°之间,收集液滴直径和散射角均随收集距离的增大和针管直径的减小而减小;同样条件下,凝胶粘度越小,散射角和雾化液滴直径越小。在此基础上,针对单针管推力小的问题,分析使用多针管喷头进行凝胶推进剂静电雾化的可行性及其雾化区域分布,结果表明2号凝胶模拟液用于多喷头雾化可得到良好的雾化区域分布,适用于凝胶推进系统之中。国防科技重点实验室基金项目(61427040203162704004

西洋参多糖及总皂苷中无机元素的ICP/MS法测定

采用电感耦合等离子发射光谱—质谱联用法(ICP/MS),对西洋参样品、西洋参多糖、西洋参总皂苷中无机元素Mg、Al、P、Ca、V、Cr、Mn、Fe、Co、Ni、Cu、Zn、As、Se、Sr、Mo、Cd、Pb的含量进行测定分析。结果表明,西洋参多糖中各种元素的含量均明显高于西洋参样品,而不同方法提取的多糖中元素含量有一定差异;西洋参总皂苷中Cr、Ni、Cu、Zn、Pb元素的含量明显高于西洋参样品,而其它元素含量较低。这就为西洋参多糖、西洋参皂苷的综合开发利用及其药效提供理论依据

Compass三维剂量验证系统在鼻咽癌容积旋转调强放射治疗计划剂量验证中的应用

目的:探讨Compass三维剂量验证系统在鼻咽癌容积旋转调强放射治疗(VMAT)计划剂量验证中产生的剂量差异,并分析其原因。方法:选取17例鼻咽癌患者,在Monaco上制定VMAT计划并将其传至Compass,运用Compass自身计算的剂量(CD)和通过实测重建的剂量(RD)两种方法验证靶区和危及器官(OAR)的γ通过率、D1%、D99%、Dmean等参数。结果:治疗计划系统(TPS)-CD的所有γ通过率均>97.5%,TPS-RD的所有γ通过率均>95.0%,且TPS-CD的每一个γ通过率均大于TPS-RD中对应的γ通过率,两者靶区的γ通过率比较差异有统计学意义(t=2.110,t=2.749,t=2.489,t=2.687,t=2.798,t=2.881,t=2.921;P<0.05),但两者在OAR比较则无统计学意义。TPS-RD的靶区D1%、Dmean及D99%的三项指标绝对剂量差均<200 cGy,百分差<2.5%,且这三项指标在TPS和RD之间的差异均无统计学意义;左右晶状体的三项指标的剂量在TPS和RD之间的差异均有明显统计学意义(t=4.328,t=4.658,t=4.210,t=4.511,t=4.896,t=5.241;P<0.05);脊髓、脑干、左右腮腺等OAR的D99%在TPS和RD之间的差异有统计学意义(t=4.018,t=4.035,t=3.646,t=4.112;P<0.05),Dmean和D1%在TPS和RD之间的差异均无统计学意义。结论:Compass三维剂量验证系统在VMAT计划剂量验证中可直观、快速的分析出靶区和OAR的理论和实际照射剂量差异,为剂量的精准实施提供数据支持