Research on the Influencing Factors of College Students' Online Consumption Behavior

为了引导大学生正确的网络消费,同时也为商家提供合理的网上营销策略,通过网上问卷的形式,对466名在校大学生进行网络消费调查,对回收的数据进行描述性统计分析,对量表进行效度与信度分析,分析结果表明,大多数大学生认为网络购物的可信度在60%~90%,商家信誉与产品质量是大学生最为关注的。To guide the rational consumption of college students on the network,also to contribute reason-able online marketing strategy to businesses,466 college students were investigated by network questionnaireabout on-line consumption. Adescriptive statistical analysis on the reclamation data is carried on,and the validi-ty and reliability of the scale are also evaluated. The analysis results show the majority of the college studentsthought that the creditability of online consumption is 60%~90%. The main concerns of the college students arethe credibility of business and the product quality

一种快速高效的二维超声CT成像的正演算法研究

超声CT成像是采用散射场数据来重建物体内部结构的一种定量化的超声技术。本课题采用快速傅里叶变换(ffT)加速扩展波恩近似(EbA),进而基于EbA来预处理共轭梯度-快速傅里叶变换(Cg-ffT)的方法来实现正演成像的过程。该算法是在传统超声成像领域和商业超声软件中没有使用过的;同时,在保持同等计算精度的条件下,该算法对比传统超声成像正演算法具有速度更快等优点

Metabolic Response of Basal Ganglia in Copper-laden Rat to Gandouling Based on ~1H NMR Spectroscopy

采用核磁共振氢谱(1H NMR)技术与多元统计分析相结合的方法,对肝豆灵对大鼠基底节铜损伤的调节机制进行研究。24只雄性Wistar大鼠随机分为正常组、模型组和肝豆灵组,每组8只,以铜负荷法造模。从造模第7周开始,肝豆灵组大鼠以肝豆灵灌胃。数据分析显示:与正常组比较,模型组的基底节细胞凋亡指数显著增高(p<0.01);基底节组织中的谷氨酰胺、尿苷、苏氨酸含量升高(p<0.05),甘露醇、腺苷、N-乙酰天冬氨酸、谷氨酸、N-乙酰谷氨酸(NAG)、天冬酰胺、乙酸、天冬氨酸、肌醇、三磷酸腺苷(ATP)含量降低(p<0.05);与模型组相比,肝豆灵组的基底节细胞凋亡指数显著降低(p<0.01);基底节组织中的谷氨酰胺、尿苷、乙酸、天冬氨酸含量降低(p<0.05),甘露醇、腺苷、苏氨酸、N-乙酰天冬氨酸、谷氨酸、N-乙酰谷氨酸、天冬酰胺、肌醇、ATP含量升高(p<0.05)。研究结果表明,肝豆灵可影响铜负荷大鼠基底节的代谢,对铜损伤具有一定的修复作用,其机制可能是通过调节氨的解毒和兴奋性氨基酸类神经递质的代谢,干预能量代谢,恢复神经元和神经胶质细胞功能。1H NMR spectroscopy combined with multivariate statistical method was introduced in this paper to explore the regulation effect of Gandouling on basal ganglia injury in copper-laden rats. 24 male Wistar rats were randomly divided into control group,model group and Gandouling group,with8 rats in each group. The rat model was established by copper-laden method. From the 7th week of modeling,Gandouling group was given Gandouling formula via gavage. Compared with the control group,the index of apoptosis cells in basal ganglia of model group increased significantly( p < 0. 01),and glutamine,uridine and threonine in basal ganglia were increased( p < 0. 05) while mannitol,adenosine,N-acetylaspartate, glutamate, N-acetylglutamine asparagine, acetate, aspartate, myoinositol and ATP were decreased( p < 0. 05). Compared with the model group,the index of apoptosis cells in basal ganglia of Gandouling group was significantly decreased( p < 0. 01),and glutamine,uridine,acetate and aspartate were reduced( p < 0. 05) while mannitol, adenosine, threonine,N-acetylaspartate,glutamate,N-acetylglutamine,asparagine,myo-inositol and ATP were elevated( p < 0. 05). The results showed that Gandouling could influence the metabolism of basal ganglia in copper-laden rats,which has a certain therapeutic effect on damage caused by copper. The mechanism may be restoration of the functions of neurons and glial cells,through adjusting the detoxification of ammonia and metabolism of excitatory amino acid neurotransmitter and interfering the energy metab-olism.国家自然科学基金(81202691,81201143,81371639);; 福建省自然科学基金(2015Y0032

Data Download and System Debug Based on On-chip RAM of FPGA using Serial Communication

本文开发了一种内嵌2kb rAM的uArT控制模块,可实现从PC机发送代码至控制模块内部的rAM中,再将代码读取至需要进行功能验证的系统,可以进行rAM数据下载与系统调试。控制模块利用开源的MC8051 IP核进行系统的功能验证,并成功进行了MOdElSIM下的仿真和fPgA与PC机的实际通信测试,效果良好。This paperpresents a 2 kB RAM embedded in the UART control module, can be send code from PC to the internal RAM of the control module, then the code read to the systems which need functional verification, this module can download data to the RAMand do system debugging.Control module using the open source MC8051 IP core for testing, and the result was good

Comparison of mechanism for copper-excretion between Gandouling Tablets and penicillamine by metabonomics

目的探讨肝豆灵片(大黄、黄芩、黄连、半枝莲等)和青霉胺对大鼠的代谢物,以比较两者排铜机制异同。方法适应性饲养1周后,大鼠被随机分为对照组、模型组、肝豆灵组、青霉胺组。造模结束后,取各组大鼠血清样品分析其核磁共振谱峰。结果模型组大鼠血清乳酸、糖蛋白、肌酸、肌酐、谷氨酰胺、精氨酸的量升高,葡萄糖、甜菜碱、胆碱、磷酸胆碱、脂质的量降低;青霉胺组大鼠血清葡萄糖、甜菜碱、胆碱、胆碱磷酸、脂质的量升高,糖蛋白、乳酸、肌酸、肌酐、谷氨酰胺的量降低;肝豆灵组大鼠血清3-羟基丁酸、亮氨酸、异亮氨酸、缬氨酸、胆碱、胆碱磷酸、葡萄糖、脂质的量升高,谷氨酰胺、乳酸、肌酸、肌酐、精氨酸的量降低。结论青霉胺与肝豆灵均可明显调节铜负荷大鼠的葡萄糖、乳酸、肌酸、肌酐、胆碱、磷酸胆碱、谷氨酰胺和脂质向正常范围回归的趋势。而肝豆灵片还可调节鸟氨酸循环、支链氨基酸、3-羟基丁酸及氨的代谢。AIM To apply metabonomics to the exploration of differences in mechanism for copper-excretion between Gandouling Tablets( Rheum officinale Baill.,Scutellaria baicalensis Georgi,Coptis chinensis Franch.,Scutellaria barbata D. Don,etc.) and penicillamine. METHODS After adaptive breeding for one week,the tested rats were randomly divided into four groups, including control, model, Gandouling Tablets and penicillamine group. After modeling,the sera of all groups were analyzed by1H-NMR spectroscopy. RESULTS The model group showed increased levels of lactate, glutamine, glycoprotein, creatine, creatinine and arginine,together with decreased levels of glucose,betaine,choline,phosphocholine and lipid. Penicillamine group had increased levels of glucose,betaine,choline,phosphocholine and lipid,together with decreased levels of glutamine,glycoprotein,lactate,creatine and creatinine. While Gandouling Tablets increased 3-hydroxybutyrate,leucine, isoleucine, valine, choline, phosphocholine, glucose and lipid, but decreased glutamine,lactate,creatine,creatinine and arginine. CONCLUSION There is a similarity of mechanism for copper excretion between Gandouling Tablets and penicillamine, mainly in the metabolic regulation of glutamine, lactate,creatine,creatinine, glucose, choline, phosphocholine and lipid returning to normal. Moreover,Gandouling Tablets can regulate the metabolisms of ornithine cycle,3- hydroxybutyric acid and branched chain amino acids.国家自然科学基金青年基金资助(81202691);; 安徽省高校自然科学基金重点项目(KJ2012Z228);; 安徽省高校博士后岗位项目(2013年

基于以太网的LEON3交叉调试器的设计与实现

软件调试是软件开发过程中的一个重要环节,对于嵌入式系统开发来说,调试器尤为重要。本文在研究gdb嵌入式交叉调试器和lEOn3处理器的体系构架的基础上,给出了一种基于lEOn3处理器内置以太网接口的交叉调试器的设计和实现方法,该设计实现了gdb能通过以太网接口迅速下载程序到目标机并进行调试的功能,加快了调试速度,取得较好的效果

基于USB的交叉调试器的开发与设计

软件调试是软件开发过程中的一个重要环节,对于嵌入式系统开发来说,调试器尤为重要。本文在研究gdb嵌入式交叉调试器和lEOn3处理器的体系构架的基础上,给出了一种基于lEOn3处理器内置uSb接口的交叉调试器的开发和实现方法,该设计实现了gdb能通过uSb接口迅速下载程序到目标机并进行调试的功能,加快了调试速度,并使得开发更加方便,缩短了开发周期

Design and implementation of testing platform of small form-factor pluggable transceiver based on LabVIEW

介绍了一种利用lAbVIEW构建SfP(SMAll fOrM-fACTOr PluggAblE)光模块测试平台的方法。测试平台通过读写计算机并口来映射地址上的数据,控制并口端口的逻辑电平实现计算机并口模拟I2C总线。计算机利用模拟的I2C总线与SfP光模块实现通信。分析了生产者/消费者结构队列状态机并用于设计中,该设计模式可以及时响应前面板动作或外部事件,并且使得状态机的状态变换更加灵活多变。This paper introduces a method of constructing a SFP(small form-factor pluggable) transceiver testing platform by using LabVIEW.The testing platform controls the logic level of parallel port to simulate I2C Bus by reading and writing the data of address which map to the parallel port.The computer can attach to the SFP transceiver by means of the I2C Bus.This paper also analyzes and applies queued state machine-producer consumer architecture,this kind of design style can respond to the action of front panel or external happening without delay.What's more,it can make transformation of state more flexible and changeable

从《伤寒论》辛味药的运用看张仲景扶阳思想

《伤寒论》中处处贯穿扶阳思想,阳气未伤者防患于未然,阳气既伤者温助阳气。阳气贵在流通,阳气不能枢运亦可致其不足,此时运通阳气即是扶阳,故张仲景的; 扶阳法主要体现在温补阳气与运通阳气两方面。故分析辛味药在六经病中所起的通阳、护阳、运阳及回阳的作用,如通阳扶阳以辛甘温,清热通阳以辛寒,调枢运阳; 以辛苦,温扶阳气以辛热,指出了张仲景对阳气的重视,为临床治疗疾病提供思路

基于以太网的嵌入式源代码级调试系统设计

随着嵌入式技术的迅速发展,一个好的交叉调试器对缩短嵌入式软件的开发周期有着重要意义。本文针对ArC810处理器的现有调试方式下载速度慢的不足,提出了通过PCI以太网卡下载待调试程序的调试方法。经过实验,下载速度达到418kb/S,满足了快速下载的需要,并实现了源代码级调试