B/S架构网络考试系统关键技术探析

本文以当前日益兴起的无纸化考试为研究对象,结合B/S架构、ASP及数据库技术的特点,阐述了网络在线考试系统模块设计过程中一些关键技术,并对系统各主要功能模块进行了探析,特别针对＂如何实现考生选择科目后进入在线考试窗体,考试在线计时,答题时间到系统强制考生退出,以及答题结束后对客观题的自动评分、存档＂等方法进行了分析。     

在线考试系统题库设计与实现

本文阐述了在B/S结构的在线考试系统中,如何设计和实现具有较强的安全性、完整性控制、较少网络传输性和较强的通用性的试题数据库。该数据库的设计为在线考试系统的实现创造了良好的数据环境,易于试题库和考试系统的扩展。     

基于二维码的校园考务信息应用方法

为了减少各类考试中纸质准考证件造成的资源浪费,同时避免二维码无法承载高质量证件图像的难题,设计并实现了基于QR码的二维码考务信息系统.采用半离线半在线的方式提供考生信息采集、考务信息安排、二维码电子准考凭证生成和考务信息识别等主要功能,不但可以节约纸张资源,还可以实现参加考试人员与电子凭证信息和考生信息数据库之间的三方联合认证.     

基于ASP.NET的在线考试系统的设计与实现

采用.NET框架技术和数据库技术开发了基于B/S三层架构的在线考试系统,介绍了系统原理、系统功能设计和数据库配置。该系统具有用户登录、系统管理、在线考试3大功能模块,实现了用户管理、考试管理、成绩核算及查询等功能,提高了课程教学质量,改进了学生考核手段,实现了由传统考试方式向网络无纸化考试方式的转变。     

远程教育在线考试阅卷系统的设计及其安全性

目的为提高组织远程教育考试的效率,同时保证考试的公平性和公正性,开发基于Web的自动化在线考试系统。方法采用UML作为系统建摸语言,运用ASP技术在Web方式下,实现了计算机的数据处理、随机组题、自动阅卷评分、统计查询等功能。结果网络化考试阅卷安全系统非常适合在网络环境条件下实施在线考试。结论在线考试阅卷安全系统解决了学院现代远程教育考试工作中出现的一些实际问题,以ASP技术结合SQLServer数据库,用RSA算法对试题库进行加密操作,实现地域上分散的考生在校园内实时进行在线作业或考试,方便和简化了远程教育的教学和考试工作。     

基于Java的在线考试系统的设计与实现

随着计算机和互联网技术的发展,传统的人工出卷、现场答卷、人工阅卷等方式正在发生着巨大变革.如何使得考试过程变得方便高效,是现代教育的一个重要课题.该文设计了一个由管理员模块、教师模块和学生模块构成的在线考试系统,并基于Java语言介绍了该系统的实现方法.该系统能够降低考务过程中的人力和物力消耗,从而降低考试的组织和管理成本,同时提高试题的客观性、保密性,使考试结果更加准确公正,大幅提高考查的效率和质量.     

学生在线考试系统的设计与实现

本文讲述了在线考试系统的考试功能和后台管理大体实现过程,着重说明了该系统的设计方案及实现策略。本文主要介绍系统的以下几个模块：各科目考试管理模块、系统主窗体的设计、ASP科目考试设计。     

基于．NET的在线考试系统的设计与实现

本文介绍了一种基于．NET的在线考试系统,采用三层B／S体系结构,利用ASP．NET和C#开发,以SQLServer2005作为后台数据库。通过ADO．NET技术来连接和访问数据库,实现数据的快速处理和共享,提高系统的安全性和可靠性。其操作简单、使用方便、效率很高、具有试题的录入修改功能,实现自动组卷以及进行在线考试等重要功能。     

基于B/S模式的全国英语等级考试考务辅助管理系统的设计与实现

本文根据全国英语等级考试考务管理的实际需要及目前教育部考试中心下发的考务管理系统的现状,开发了一套"基于B/S模式的全国英语等级考试考务辅助管理系统".该系统功能强大、性能稳定、界面友好,能大大方便考生包括外地的考生,也能大大减轻考务管理工作人员的劳动强度,减少错误率,有力地提高工作效率,有较好的应用推广价值.     

基于J2EE的多课程通用考试系统的设计

采用基于J2EE模型的开发方法设计一个多课程通用考试系统。该系统包括系统管理、考生考试和教师管理3个功能模块。系统利用Applet的图形绘制功能与图片文件相结合的存取方式解决公式、图片等多种试题资源的入库与组卷问题,实现了多课程通用的在线考试功能。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.