橡胶输送带橡胶原料配混微机监控系统

利用计算机监控技术、齿轮泵和螺旋加料器的变频调速技术、称重值模糊控制技术、气力输送技术以及生产流程的模拟屏动态显示技术研制开发的橡胶输送带橡胶原料配混微机监控系统,成功地解决了橡胶原料配混生产中减少环境污染,改善生产工作条件,提高工作效率和控制产品质量等诸多问题。实践证明:该系统的应用具有显著的经济和社会效益,在橡胶产品生产行业具有很好的应用前景。     

单机最小化加权总完工时间的产品加工问题

In this paper,a fabrication scheduling problem concerning the production of components at a single manufacturing facility was studied,in which the manufactured components are subsequently assembled into a finite number of end products. Each product was assumed to comprise a common component to all jobs and a unique component to itself.Common operations were processed in batches and each batch required a setup time.A product is completed when both its two operations have been processed and are available.The optimality criterion considered was the minimization of weighted flow time.For this scheduling problem,the optimal schedules were described in a weignted shortest processing time first(WSPT)order and two algorithms were constructed corresponding to the batch availability and item availability,respectively.     

PVC管材管件配混生产线控制系统

利用计算机监控技术、齿轮泵和螺旋加料器的变频调速技术、称重值模糊控制技术、气力输送技术以及生产流程的动态监控显示技术研制开发的PVC管材管件配混生产线控制系统,提出了将一种原料称重的过程,根据具体情况分成4个称重阶段后再分别细化处理,同时还考虑了输送管路尾端余量等随机参数的自适应称重控制程序,并给出了程序设计的步骤和程序的框图。成功地解决了PVC原料配混生产中粉尘处理、减振处理,改善了工作环境,减少了化学原料粉尘对人体的危害,提高产品质量和工作效率等诸多问题。实践证明：该系统在本行业和相关的行业中应用具有显著的经济效益和社会效益。     

A dynamic ubiquitous learning resource model with context and its effects on ubiquitous learning

Most ubiquitous learning researchers use resource recommendation and retrieving based on context to provide contextualized learning resources, but it is the kind of one-way context matching. Learners always obtain fixed digital learning resources, which present all learning contents in any context. This study proposed a dynamic ubiquitous learning resource model with context. The model has context information and a flexible content structure that allows contents to be adjusted dynamically in different contexts, thus providing learners the contextualized resources that best match their contexts. In order to verify the effects of the contextualized resources, a contrast experiment was carried out in a vocational school in China. The experimental results showed that the contextualized resources could better improve learners' learning achievement and efficiency, improve their self-learning efficiency while reducing their cognitive load. Learners thought the ubiquitous learning system which provided contextualized resources was more useful.     

红壤土地资源开发中数量质量的演化

分析了我国红壤地区资源开发过程中质量与数量的时空变化,揭示了红壤土地开发过程中诱发的土壤质量退化、生态环境恶化、粮食生产波动等现象产生的原因,探讨了人口增长、工业化、城市化和自然资源条件对红壤土地开发效益的影响,从而提出红壤区可持续发展的资源利用战略。     

汽车发动机连杆铣削组合机床研究

连杆是汽车发动机的重要组成部分。由于连杆结构的特殊性,对连杆体与连杆盖结合面的加工提出了更高的要求。通过对连杆端面的分析,提出采用立式单面铣削组合机床进行加工。在完成组合机床总体方案的基础上,确定了加工工艺、进给参数、加工工序图等相关设计内容。该组合机床具有结构紧凑、刚性好、生产率高、加工质量稳定等特点,将有效提高连杆端面的生产效率和加工质量。     

北京周口店地区房山岩体中岩浆混合作用的野外实践教学

岩浆混合作用对于认识岩浆演化、岩浆成岩过程和壳幔物质与能量交换等有重要意义。北京周口店地区房山复式岩体岩浆混合作用的特征十分明显和丰富,精彩地呈现了岩浆混合的方式、过程和程度,是岩浆混合作用野外地质实践教学的理想场所和天然实验室。本文总结了岩浆混合作用野外实践教学所面临的一些问题和挑战,并结合相关科学研究成果探讨了以房山岩体岩浆混合作用为例的野外地质实践教学的主要内容。     

未溶碳化物对60Si2CrVAT弹簧钢疲劳性能的影响

为了提高高速货运列车转向架弹簧的耐疲劳性能,对两个炉号的棒状60Si2CrVAT弹簧钢用相同工艺热处理后,在MTS880材料试验机上进行了三点弯曲疲劳寿命对比试验,实验载荷采用阶梯式增加法;用扫描电镜对弹簧钢的疲劳断口和基体组织进行观察。疲劳实验结果表明,不同炉号的弹簧钢疲劳寿命相差很大。组织分析表明,疲劳寿命较低的弹簧钢中,淬火加热前存在颗粒状碳化物,奥氏体化时未溶入奥氏体而残留在淬火组织中,并在局部聚集,导致疲劳寿命降低。     

餐厨垃圾生物制氢研究进展

利用餐厨垃圾进行生物制氢,不仅可解决餐厨垃圾的处置问题,而且可以产生清洁的氢能,已成为当前国内外学者研究的热点之一。了解了餐厨垃圾产氢机理及底物特性、工艺条件、产氢茵种、反应器类型等应用化技术在餐厨垃圾制氢中的应用现状。展望了餐厨垃圾制氢的研究应针对高效混合产氢菌种的选育和改造、各种生态因子对餐厨垃圾产氢茵群影响的研究．并进行新的餐厨垃圾制氢工艺和高效、规模化的餐厨垃圾生物制氢反应器的开发。     

冠心宁注射液中大类成分的含量测定

该实验通过测定冠心宁注射液中的丹参酚酸类成分和糖类成分,为评价冠心宁注射液的质量品质提供理论依据.采用紫外可见分光光度法检测,进行方法学考察,测定10批冠心宁注射液的丹参酚酸和总糖的含量.结果表明,NaNO2-Al（NO3）3显色法用于测定丹参酚酸的含量;苯酚-硫酸法用于测定总糖的含量;10批冠心宁注射液中丹参酚酸和总糖的平均含量分别为93.27mg.10 ml-1、969.87 mg.10 ml-1,分别占固含物的7.66%、79.60%.因此,该方法简便快速、准确可靠,可有效评价冠心宁注射液中80%以上的大类成分的含量.     

模式与实践：地方院校英语专业课外活动体系建设研究——以凯里学院为例

地方本科院校英语专业肩负着为地方经济社会建设培养和输送英语应用型人才的历史重任，然而，由于各方面的原因，英语专业在应用型人才培养过程中遇到具体的困难和问题，亟待解决，特别是在课堂教学时数不足方面需要得到最大化的重视。本研究以凯里学院为例，对相关理论进行研究，对现状进行分析，提出构建英语专业课外活动体系以解决课时不足的问题，并对专业课外活动特点及实践模式、实践过程监控和评估提出建议。     

不同采摘标准和做青强度对乌龙茶的生化成分变化和品质的影响

以紫阳群体种茶树鲜叶为试材,以铁观音品种茶树鲜叶为对照（CK）,研究了采摘标准和做青强度对乌龙茶的生化成分变化和品质的影响。结果表明,各采摘标准的茶树鲜叶生化成分含量差异显著,以小开面最丰富,中开面次之、大开面最差;加工过程中茶多酚、水浸出物、咖啡碱的含量减少,氨基酸有所增加;茶多酚和水浸出物持续减少,做青强度越大减少幅度越大,氨基酸和咖啡碱的增减变化还与鲜叶原料有关。各处理之间成茶感观品质差异显著,所有处理除了小开面重做青茶样与CK品质差异不显著外,其他均与CK差异显著。还提出了利用紫阳群体种茶树鲜叶进行乌龙茶加工的工艺。     

Batch process monitoring based on multilevel ICA-PCA

In this paper, we describe a new batch process monitoring method based on multilevel independent component analysis and principal component analysis （MLICA-PCA）. Unlike the conventional multi-way principal component analysis （MPCA） method, MLICA-PCA provides a separated interpretation for multilevel batch process data. Batch process data are partitioned into two levels： the within-batch level and the between-batch level. In each level, the Gaussian and non-Gaussian components of process information can be separately extracted.I^2 T^2 and SPE statistics are individually built and monitored. The new method facilitates fault diagnosis. Since the two variation levels are decomposed, the variables responsible for faults in each level can be identified and interpreted more easily. A case study of the Dupont benchmark process showed that the proposed method was more efficient and interpretable in fault detection and diagnosis, compared to the alternative batch process monitoring method.     

Progress in research on mixing techniques for transverse injection flow fields in supersonic crossflows

The transverse injection flow field has an important impact on the flowpath design of scramjet engines. At present a combination of the transverse injection scheme and any other flame holder has been widely employed in hypersonic propulsion systems to promote the mixing process between the fuel and the supersonic freestream; combustion efficiency has been improved thereby, as well as engine thrust. Research on mixing techniques for the transverse injection flow field is summarized from four aspects, namely the jet-to-crossflow pressure ratio, the geometric configuration of the injection port, the number of injection ports, and the injection angle. In conclusion, urgent investigations of mixing techniques of the transverse injection flow field are pro- posed, especiaUy data mining in the quantitative analytical results for transverse injection flow field, based on results from multi-objective design optimization theory.     

MATLAB语言在教学管理中的应用

针对教学管理任务中的批量数据处理和分析报告,采用MATLAB语言和Word文字处理软件联合程序设计的方法,利用动态数据交换技术,实现教学成绩批量处理和自动分析。文中给出了系统工作流程,并在此基础上阐述了程序设计原理,以示例的方式给出了实现方法。     

现代发酵技术在提高中药药用效能方面的作用

发酵技术用于中药生产与研究不仅可以炮制中药,还为改进中药制药工艺提供了新技术,有利于改善中药的药理和毒理作用和有效成分的提取与分析。同时利用中药作为发酵基质能够提高发酵效能,这种新的发酵技术在中药发酵中正成为一种趋势。     

铸态铁素体球墨铸铁的生产工艺研究

针对铁素体球墨铸铁生产时质量不稳定和成本较高等问题，通过各种可行的工艺手段——严格成份控制，采用高效孕育剂，瞬时孕育处理等，在铸态获得铁素体基体的球墨铸铁，不用进行退火处理，使生产周期缩短，成本下降，并且质量稳定，创造了较好的经济效益和社会效     

Batch and fed-batch production of butyric acid by clostridium butyricum ZJUCB

The production of butyric acid by Clostridium butyricum ZJUCB at various pH values was investigated. In order to study the effect of pH on cell growth, butyric acid biosynthesis and reducing sugar consumption, different cultivation pH values ranging from 6.0 to 7.5 were evaluated in 5-L bioreactor. In controlled pH batch fermentation, the optimum pH for cell growth and butyric acid production was 6.5 with a cell yield of 3.65 g/L and butyric acid yield of 12.25 g/L. Based on these results, this study then compared batch and fed-batch fermentation of butyric acid production at pH 6.5. Maximum value （16.74 g/L） of butyric acid concentration was obtained in fed-batch fermentation compared to 12.25 g/L in batch fermentation. It was concluded that cultivation under fed-batch fermentation mode could enhance butyric acid production significantly （P〈0.01） by C. butyricum ZJUCB.     

扶贫顶岗支教的哲学思考

忻州师范学院在9年内先后19次共派出4700多名学生赴原平、河曲等6个市县的贫困地区农村学校进行为期半年的扶贫顶岗支教。2007年初,该院又与原平市、繁峙、代县等5个市县签订了为期6年的支教合同。每年分两批各派1000名学生去承担这些市县条件艰苦学校的教学任务。扶贫顶岗支教具有马克思主义哲学深厚的理论基础,它体现了马克思主义哲学与时俱进的理论品质、认识论的观点、实践性的品格、关于以人为本和人的全面发展的观点。     

Batch and fed-batch production of butyric acid by Clostridium butyricum ZJUCB

INTRODUCTION Butyric acid has several potential applications in industry. Its applications in the foodstuffs and beverage industries are widespread. It may be used as the pure acid in the dairy industry, or in the form of esters as a food additive to increase fruit fragrance. Furthermore, butyric acid could also have some important physiological functions. For example, butyric acid esters are the character-impact flavors in tropic fruits and dairy products (Centeno et al., 2002; Watson e…