Cryptanalysis of One Fair E-cash System

Introduction The concept of group signature was intro-duced by Chaum and Heyst[1], which allows indi-vidual members to make signatures on behalf of thegroup. More formally, a secure group signaturescheme must satisfy such properties as unforgeabil-ity, anonymity, traceability, coalition-resistance,unlinkability, exculpability[2,3]. An important application of group signature isto construct fair e-cash systems. A fair electroniccash system is a system that allows customers tomake payments anon…     

Dynamics of Brix and pH of Flag Leaf Sap of Winter Wheat Cultivars and Their Relationship with Grain Yield Components

Crop breeders are trying to integrate physio-logical screening tools into breeding programs toimprove breeding efficiency. Different physiologi-cal parameters, such as leaf photosyntheticrate[1,2], leaf chlorophyll content, canopy tempera-ture depression and stomatal conductance[3], andradiation use efficiency[4], leaf conductance[5],have been recommended as possible screening toolsfor wheat breeding. However, few literature wasfound to use plant tissue sap analysis as screeningtools in breedi…     

On Finite Groups with Special Conjugacy Classes

IntroductionIn 1973, Markel[1]began to investigate the“S3-conjecture”; that is,S3is the only finite group inwhich every conjugacy class has different order(note: the“order”here from Ref.[2] means thelength of a conjugacy class of a group). Many schol-…     

Studies on Arteanninum and Allicinum in the Treatment of Eperythrozoonosis

Since the year 1928, when Schilling andDinger first discovered eperythrozoon from ro-dent[1], eperythrozoon has been spread all over theworld[2~6]. Described by Puntaric and his col-leagues in 1986[7], the eperythrozoonosis has beenattached more and more importance on its infectionroute and outbreak character[7~11]. Since mosteperythrozoonosis is a latent infection and the un-successful artificial cultivation of the pathogeny,the research conducting the life circle, transmis-sion, infection r…     

PREDICATING THE “WITS” APPRAISAL FROM THE ANB ANGLE

Objective In order to explore the relationship between the “Wits" appraisal and the ANB angle, and to see how accurately one can predict the “Wits”. Methods Given the ANB, lateral cephalometric radiographs were taken on 50 boys and 50 girls between the ages of 11～13. Results Each subject had no treatment either a Class Ⅰ or Class Ⅱ malocclusion, a good growth pattern. Group Ⅰ , 13 subjects of 100 had ANB≤1.5°, and negative “Wits” appraisal; group Ⅱ , 61 subjects had 5.8°＞ANB＞1.5°, and “Wits” appraisal either positive or negative; group Ⅲ , 26 subjects had ANB angle≥5.8°, and positive “Wits” appraisal. Statistically analysis showed that there was no sig nificant difference in sex (P＞0.05); there was significant correlation between the ANB and “Wits” values in the group Ⅱ and group Ⅲ (P ＜0. 05); there was statistical significance in regression analysis in the group Ⅰ and group Ⅱ (P ＜0. 05). We could predict the “Wits” with 21％ accuracy in group Ⅱ. Conclusion The results indicate that these figures are statistically significant but clinically irrelevant.     

RELATIONS OF DERIVATIVE ALGEBRA AND RING OF DIFFERENTIAL OPERATORS IN CHARACTERISTIC p>0

Let K be a field of characteristic p>0. We prove that the derivative algebra of K[x1,…,xn] is a proer subring of the ring of differential operators of K[x1,…,xn]. A concrete example is given to show that there is a differential operator of order p that does not belong to the derivative algebra. By these results, is follows that the derivative algebra is Morita equivalent to K[xp1,…,xpn], and hence its global homological dimension, Krull dimension, K0 group and some other properties are got.     

Research and Application Prospect of Computer Simulation on Heat Treatment Process

AseriesofgreatProgresseshavebeenachievedintheresearchofheattrCtoelltmathematicalmodelandcomPotersimulationduringrecellttenyears.ThecouPlingbforeentemPerthee-phasetransformation-stressl'-'],threedimensionalnon-linearFEManalysis[#-'],thecalculationofphasetransformationkinetics['-'],theeffectofstressonphasetransformationkineticsl,'-,,],thedealingwithabruPchangedboundnyconditionsl"#],thesimulationonfludfield["l,andotherinveshgationshavecarredout,andtheirachievementshaveProvidedasoundbasisfo…     

来函照登

学报编辑部: 1986年第1期刊登我所写的论文《桁架网络的环路分析》中发现有误,应予更正: (1)式(41)前那句话“上式两边前乘[A′_n],因[A′_n][A′_n]~T=[Ω′]是个非奇异或可逆的3n方阵”不对,应改为“上式[A′_n]~T的右逆为[A′_n][Ω′]~(-1),[Ω′]=[A′_n]~T[A′_n]”。(41)式应改为     

DETERMINATION OF TETRACYCLINE AND OXYTETRACYCLINE BY FLOW-INJECTION CHEMILUMINESCENCE METHOD

Tetracycline and oxytetracycline are broad-spec-trumantibiotics.They are not only used in humanpathologies,but alsoin veterinary medicine,ani malnutrition and feed additives for cattle breeding.In the past few years,the deter mination meth-ods of tetracycline and oxytetracycline were repor-ted,which involved in difference spectrophotome-try[1],HPLC[2,3],spectrophotometry[4-7],HPLC-MS[8-9],spectrofluori metry[10],solid-phase extrac-tion[11]and kinetic methods.Recently,flow-injection CL met…     

Poincaré Inequalities on a Countable Set E and Ω={x:0≤x_i≤a, i=1,2,…,n}

IntroductionPoincaréinequalitiesarewidelyappliedinmanyfieldssuchasstochasticanalysis,functionalanalysisandeigenvalueestimate. AlotofresultsaboutPoincaréinequalitieshavebeenobtained[1-4], mostofthemwerebasedontheboundeddomaininndimen sionalEuclideanspace…     

井字型通道影响下的虹口区交通发展策略研究

为解决浦西外滩地区交通拥堵、越江交通瓶颈制约等问题,上海制定了井字型通道规划建设方案.在此背景下,文中分析了虹口区交通发展现状、井字型通道建设影响,提出虹口区交通发展的调整目标和综合框架,并进一步提出了构建交通主轴、合理布设井字型通道出入口、北外滩路网衔接、四川北路地区公交化和大柏树人行系统改善等交通发展策略.     

鲁迅"魏晋文学自觉说"辨正

鲁迅关于魏晋时代是"文学的自觉时代"的学术观点有自己独特的内涵.鲁迅在《魏晋风度及文章与药及酒之关系》中,肯定的是魏晋时代一批文人疏离或摆脱了重教化的实用主义文学观念,他们坚持"师心"、"使气"并在这个意义上获得自身"文"的独立思想品格和审美价值,这种意识的出现,就是鲁迅所说的"自觉".赵敏俐《"魏晋文学自觉说"反思》体现了他在今天与鲁迅当年不同的一种对传统文化的选择与阐释.     

湖南“长株潭”地区汽车售后服务市场存在的问题及解决措施

湖南"长(沙)株(洲)(湘)潭"地区汽车售后服务市场存在着销售与服务相脱节、维修保养价高质差、服务网络布局不合理、销售体制不规范等问题,可以通过提高消费者自我保护意识、树立品牌意识、发展MDCFS汽车销售模式等措施来解决。     

高职高素质"双师型"教师队伍建设途径探讨

文本从"双师型"教师队伍的涵义入手,对校内的专业课教师实战能力的培养途径及企业兼职教师聘任方法进行了探讨,提出了比较可行的"双师型"教师队伍建设方法。     

组织及其"贫"信息建模方法

管理科学研究的对象是组织.组织是复杂的人机系统.组织的外部信息输入是设置组织的基准输入和全局目标的依据.现实组织的外部信息输入通常处于"贫"信息状况.本文提出基于相似关联分析的"贫"信息建模方法,同时据此构建一种SCGMsmv(1,1)模型.示例表明该模型精度高、计算量少,具有良好的应用前景.     

全球化背景下高校"两课"教育的思考和创新

全球化极大地促进了世界范围内不同思想文化的相互激荡,西方的意识形态、社会思潮和价值观正在冲击、动摇我国主流意识形态和主流文化的地位,对高校“两课“教育带来了新的严峻的挑战.面对这种挑战,高校“两课“教育要与时俱进,实现教育理念、教育内容和教育方法的创新,不断提高“两课“教育的针对性和实效性.     

“网络红人”现象的伦理思考

随着网络传播的迅速而广泛,越来越多的＂网络红人＂出现在大众的视野中.＂网络红人＂现象从他们走红所利用的手段来看,可以分为玩情欲牌、玩动作牌、玩清纯牌、玩自恋牌等类型;＂网络红人＂现象对当代青年人传统价值观、社会公德意识、责任意识等方面产生深刻负面影响;应该从网络立法、教育、自律和荣辱观等路径来解决＂网络红人＂现象带来的伦理问题.     

无网格对称粒子法中两类热边界条件的处理

第二、三类边界条件对无网格对称粒子法求解瞬态热传导问题的计算精度和稳定性有重要影响。提出一种有效的方法来处理这两类边界条件。该方法采用统一表达式描述两类边界条件,并将边界粒子分为光滑域内的边界粒子和非光滑域的边界粒子。对于前者,在温度导数的对称粒子近似中引入边界条件方程,精确地施加边界条件;对于后者,根据其相邻粒子的温度导数,采用具有一阶连续性的粒子近似,计算出其温度导数。应用该方法计算了一个数值算例。计算结果与解析解和有限元法的计算结果符合良好,且计算误差随时间呈下降趋势,说明该方法具有良好的精度和稳定性。     

中外合作办学“双校园”模式分析与思考

当前中外合作办学模式不断翻新并日趋成熟;＂双校园＂模式逐渐成为中外合作办学的主流形式。文章重点分析了中外合作办学＂双校园＂模式内涵、特点,并对推进＂双校园＂模式的优化发展进行了若干思考。     

高等职业教育"订单式"培养的探索

职业教育"订单式"培养是一种新型的人才培养方式,由于可以实现技术院校教学改革的零距离对接,毕业生的零距离就业和零距离上岗,倍受青睐。但在"订单式"培养具体实施的过程中仍然存在一些问题亟待解决。文中在阐述"订单式"培养目的意义和基本环节的基础上,重点对实施中存在的问题进行了讨论和分析,对职业技术院校办学模式的改革和实施"订单式"培养具有一定的指导意义。