基于RT-Thread的CC3100应用方案的研究与实现

本文提出了一种嵌入式无线数据传输系统,以ARM9作为MCU,使用RTT操作系统。在系统中加入CC3100的驱动,把数据经由CC3100无线模块传送,实现无线数据的收发。本文将重点介绍系统的结构框架以及无线模块传输功能的实现

ANALYSIS ON DOUBLE LEVERAGE RISK OF FINANCIAL HOLDING CONGLOMERATES

国内商业银行近年资产扩张迅速且坏账率居高不下,普遍出现了资本充足率不足的情况,一些新兴的金融控股集团开始效仿国外的做法,采用风险较大的双重财务杠杆来为子银行补充资本金。本文以中信控股有限责任公司2003年底为中信实业银行融资补充60亿资本金为案例,介绍双重财务杠杆的使用手法和潜在的风险,以期为认识和防范双重财务杠杠风险提供借鉴。In China,commercial banks grow quickly these years with increasing bad debt,this results in generally lacking of capital.In order to solve this problem,some financial holding conglomerates beginn to adopt double leverage to raise capital for its commercial banks.This paper studies the case of Citic Group,introduces the use and potential risk of double leverage,an provides some advises on recognizing and supervising double leverage risk

如何增强我国金融体系的稳定性探讨

金融稳定关乎整个经济的健康发展,银行稳定是我国金融稳定的核心。作为我国金融主体的银行背负着不良资产的历史包袱,面临着银行业逐渐全面开放的日益增大的竞争压力,而且还缺乏有效的稳定机制。近年来人们一直在讨论的存款保险制度的确越来越迫切需要建立,但是,本文认为存款保险制度必须与银行体系市场化改革、金融风险预警系统、金融机构市场退出的法律制度相结合,在一国的内部共同构成一个金融机构特别是银行的风险监督、市场退出和危机处理机制

脑动静脉畸形出血因素中的血液动力学分析

脑动静脉畸形（Arteriovenous Malformation,AVM）是一种先天性的动静脉间短路血管组织,其所导致的异常脑血液动力学状态是造成脑AVM血管破裂出血和产生某些神经功能障碍的重要原因之一。本文结合脑血管内血液动力学参数的临床测量数据,通过建立脑AVM血液动力学模型的方法,对脑AVM出血的血液动力学因素进行了系统的分析。文中新提出的模型克服了以往的定常AVM模

典型高温薄膜传感器的研究进展

随着航空发动机、燃气轮机、内燃机、石油化工设备等的设计、运行要求不断提高,对典型高温薄膜传感器如高温薄膜应变计、高温薄膜温度计、高温薄膜热流量计的需求越来越迫切。文中介绍了高温薄膜应变计、高温薄膜温度计、高温薄膜热流量计以及多功能集成高温薄膜传感器等典型高温薄膜传感器的研究现状,分析了它们在敏感材料、材料体系、制造工艺和信号传输方面存在的主要问题,可为应用于更严酷环境的高温薄膜传感器的技术研究提供参考

几种热塑牙胶根管充填方法根尖封闭性能的实验

【目的】比较并分析侧压根管充填术和4 种热塑牙胶根管充填术的根尖封闭性能。【方法】收集新鲜 拔除的54 颗牙, 预备后随机分为5 组。分别采用侧压根管充填术、热牙胶侧压根管充填术、Thermafil 根管充填 术、热牙胶垂直加压根管充填术和注射式热牙胶根管充填术, 进行牙胶根管充填。使用染料渗入法检测根尖微 渗漏的发生情况, 染色后在立体显微镜下测量染料自根尖渗入的长度并分析其结果。【结果】根尖微渗漏渗入 长度的中位数依次为冷侧压根管充填组1.55 mm 、热牙胶侧压根管充填术组为0.85 mm、热牙胶垂直加压根 管充填术组0.65 mm 、Thermafil 根管充填组0.50 mm、注射式热牙胶根管充填组0.40 mm; 两两比较发现冷、 热牙胶根管充填术后的根尖微渗漏发生差异有显著性意义( P< 0.05) ; 各组热牙胶根管充填术后的根尖微渗 漏发生情况差异没有显著性意义( P >0.05) ; 只有注射式热牙胶根管充填组与Thermafil 根管充填组之间的根 尖微渗漏差异有显著性意义( P< 0.05) 。【结论】热塑牙胶根管充填术的根尖封闭能力优于冷牙胶侧压根管充填 术; 4 种热塑压胶根管充填术之间, 以注射式热牙胶根管充填术的根尖封闭能力较好

Phytoplankton community structures revealed by pigment signatures in Norwegian and Greenland Seas in summer 2012

对2012年中国第5次北极科学考察期间的挪威海和格陵兰海两个断面的光合色素进行了高效液相色谱(HPlC)分级分析,通过藻类色素化学分类分析软件(CHEMTAX)获得了不同浮游植物类群对叶绿素A的贡献,进而得到该海域表层和次表层(30 M)的浮游植物群落结构。结果表明:表层总叶绿素A的浓度为23.59 ng/l,低于次表层的30.38 ng/l,其中浮游植物根据粒径划分对总叶绿素A的贡献由高到低依次是微型浮游植物、小型浮游植物和微微型浮游植物。该海域同时存在葱绿叶绿素(PrASInO)、墨角藻黄素(fuCO)、别藻黄素(AllO)、多甲藻素(PErId)、玉米黄素(zEA)、19-丁墨甲藻黄素(19'bf)和19-六已墨甲藻黄素(19'Hf)等色素,其浓度和分布与温盐和营养盐等环境因子存在一定的相关性。不同粒径浮游植物色素组成显示,微微型浮游植物群落中以S型定鞭藻(28%)、n型定鞭藻(21%)、硅藻(18%)和青绿藻(12%)占优;微型浮游植物群落的优势类群为S型定鞭藻(53%)、n型定鞭藻(20%)和硅藻(12%);而小型浮游植物群落主要为硅藻(63%)和甲藻(17%)。Composition of phytoplankton controlled not only the formation of the Food Chain,but also the efficiency of energy transfer.At the same time,phytoplankton influenced the distribution of nutrient and the sedimentation of organic particulate matter.So study of phytoplankton community structures plays an important role in understanding the ecological function of phytoplankton.Photosynthetic pigments needed by photosynthesis,are very good biomarkers.They can be used to research and characterize phytoplankton community structure.Norwegian and Greenland Seas which are influenced by the Arctic water with low temperature and salinity and Atlantic water with high temperature and salinity.Understanding of correlation between environmental factors and phytoplankton community structure,is important for understanding the community structure of the marine organisms and their ecological function.During the 5thChinese Arctic Research Expedition in summer 2012,we analyze the photosynthetic pigments fromNorwegian and Greenland Seas by HPLC.Contributions of different phytoplankton assemblages to Chlorophyll a were obtained by Chemical Taxonomy( CHEMTAX),and thus resulted in composition of the phytoplankton community structure at the surface and subsurface water( about 30 m depth).The result showed that average concentration of Chlorophyll a at surface water was 23.59 ng / L,lower than that at upper water( 30.38 ng / L).The contributions of phytoplankton to Chlorophyll a were nano-> micro-> pico-one.Prasinoxanthin,Fucoxanthin,Alloxanthoxyletin,Peridinin,Zeaxanthin,19'-but-fucoxanthin,19-hexanoyloxyfucoxanthin were observed in the waters.Their distributions were relative to environmental factors,including Nutrients,temperature and salinity.These photosynthetic pigments showed negative correlations with temperature and salinity.Whereas they showed positive relations with nutrients,including NO-2,NO-3,SiO3 2-and PO3-4.The correlations of different phytoplankton and environmental factors were different.Diatoms had a very significant positive correlation with SiO3 2-,but had no correlation with PO3-4,NO-2and NO-3; Haptophytes-N had significant positive correlations with PO3-4,NO-2and NO-3; Haptophytes-S also had a positive correlation with PO3-4,but had no correlation with NO-2and NO-3.The maximum values of these photosynthetic pigments,except for Zea and Fuco,existed in the subsurface of the section BB.The distribution and concentration of photosynthetic pigments could explain the distribution and abundance of the phytoplankton to some extent.Not only because the pigments are complex and multiple,but also because there are inevitable errors in the testing and sampling,we cant determine the existence and abundance of the phytoplankton.So we use the CHEMTAX to obtain the contributions of different phytoplankton assemblages to Chlorophyll a,and thus resulted in composition of phytoplankton community structure.The composition of phytoplankton showed that Haptophytes-S( 28%), Haptophytes-N( 21%),Diatoms( 18%),and Prasinophytes( 12%) were main assemblages in the picoplankton; the main composition of nanophytoplankton were Haptophytes-S( 53%),Haptophytes-N( 20%),and Diatoms( 12%); meanwhile, Diatoms( 63%) dominated the microphytoplankton,followed by Dinoflagellates( 17%).Haptophytes-S,Haptophytes-N and Diatoms were dominant species in the surface and subsurface of section BB and AT belonging to the Norwegian and Greenland Sea.If Fucoxanthins and Diatomss existence in picophytoplankton could explain the tendency of phytoplankton to micro and miniaturization,these still need to be more sufficient evidence.国家自然科学基金(41076130;41206189); 南北极环境综合考察与评价专项(CHINARE2011-2015

蛋白质组学技术筛选与鉴定镉诱导下褐云玛瑙螺肝脏的差异蛋白质

比较丙酮/TCA沉淀法和直接裂解法,优化提取与分离褐云玛瑙螺(Achatina fulica,AF)肝脏全蛋白。采用丙酮/TCA沉淀法,可获得约600个蛋白质斑点。用0.5 mg/L CdCl2溶液浸泡后的去梗小白菜喂养AF,并作为镉盐诱导AF肝脏表达应激蛋白质的实验材料。采用蛋白质组学技术筛选出由镉盐诱导AF肝脏表达的14个差异蛋白质斑点,并用肽质量指纹图谱技术(peptide mass fingerprinting,PMF)和数据库比对法初步鉴定出7种差异蛋白质,其中部分为热激蛋白(heat shock protein)、甲基转移酶(Methyltransferase)、三磷酸腺苷结合盒子转运体(ABC transporter)、钼酸盐转运子亚基(molybdate transporter subunit)和磷酸甘油酸变位酶(phosphoglycerate mutase)。差异蛋白质均参与镉盐代谢,并适合作为监测土壤或食物中镉污染程度及危害性的指示蛋白质

年老化视空间注意脑机制的研究

采用&quot;提示-目标&quot;的视觉实验范式,通过事件相关电位(ERP)技术研究了视觉注意年老化脑机制.青年和老年被试各16名;背景由3个同心黑色圆形线条组成,提示为大、中、小不等的3个圆圈组成,刺激材料是随机选取的大写英文字母,组成3个同心圆圈.不同范围圆圈提示时,靶刺激&quot;T&quot;出现在相对应的圆圈,而两个干扰刺激&quot;T&quot;分别呈现在对侧视野的另外两个圆圈.要求被试人根据提示寻找效应圈的靶字母&quot;T&quot;,并尽快尽准确地按键判断出现在左视野还是右视野.结果显示干扰刺激的存在导致靶刺激识别难度增加,引起P1的增强和N1的降低;随着提示等级的增大,两组反应时均逐渐延长,早期ERP成分P1与N1波幅均减小;与青年组相比,老年组反应时更长,后部P1增强、N1抑制,且额区P2成分亦受到显著抑制.研究结果与年老化的&quot;复杂度效应&quot;一致;所发现老年组P2成分的显著抑制,提示年老化可能导致视觉空间注意(非随意注意)的前脑区功能缺陷

基因编辑的法律与伦理问题

跨域同仁聚焦公共话题,本辑围绕基因编辑的法律与伦理议题,各位学者基于不同的立场与视角做出不同的评议。为尊重言论,兹实录对话,仅做最低限度的技术处理