将搜索引擎中的基本技术应用于高职教学探讨

本文探讨了搜索引擎的基本技术,以及将搜索引擎的基本技术融入高职教学中的合理性、有效性和可行性。探讨如何将搜索引擎的基本技术融人《数据结构》课程教学中。     

第2类Stirling数Bernoulli数与Euler数的解析表示式

本文给出第2类Stirling数,Bernoulli数与Euler数的解析表示式: s_2(m+1,n)=(-1)~n/n1 sum form j=1 to n(-1)~j(?)_j~(-m+1) B_n=sum form k=1 to n 1/(k+1) sum form j=1 to k (-1)~j(?)_j~(-n) E_(2n) =1/(2n+1)[sum from p=0 to n-1 sum from k=1 to 2(n-p) sum from j=1 to k (-1)~(j-1)/(k+1)·(?)(?)(4j)~2(n-p)+4n+1]因此解决了它们的计算问题。     

中碳低合金钢衬板的研制

叙述了研制一种用于中小型球磨机的衬板的方法,该衬板具有高的强度和硬度,同时也具有较好的韧性.本文根据衬板性能要求及实际工况进行了成分设计.     

Identification of a heat shock cognate protein 70 gene in Chinese soft-shell turtle (Pelodiscus sinensis) and its expression profiles under thermal stress

The heat shock cognate protein 70 (Hsc70) is a member of a 70-kDa heat shock protein (HSP70) family that functions as molecular chaperones. In this study, a novel Hsc70 gene from Chinese soft-shelled turtle (Pelodiscus sinensis) (tHsc70) was identified. The tHsc70 full-length complementary DNA (cDNA) is 2 272 bp long with a 1 941-bp open reading frame (ORF) encoding 646 amino acids. Three characteristic signature regions of the HSP70 family, two major domains of an adenosine triphosphate (ATP)/guanosine triphosphate (GTP) binding domain (ABD), and a substrate-binding domain (SBD) were present in the predicted tHsc70 amino acid sequence. The tHsc70 gene was expressed in Escherichia coli BL21 and the expression product reacted with the anti-Hsc70 mouse monoclonal antibody by Western blotting. Homology analysis revealed that tHsc70 shared identity from 53.9% to 87.7% at the nucleotide level, and 49.1% to 99.5% at the amino acid level with the known Hsc70s. Phylogenetic analysis showed that tHsc70 was clustered together with the Hsc70 gene of another reptile species (Alligator mississippiensis). The tHsc70 was expressed in the liver, lung, heart, and skeletal muscle. The expression patterns of tHsc70 messenger RNA (mRNA) differed among different tissues under different durations of heat stress at 40 °C. Adaptation at 25 °C for 1 h after heat stress was also different among tissues and length of heat stress. Irrespective of different profiles of expression under heat stress, tHsc70 may play roles in protecting turtles from thermal stress.     

新闻搜索系统的研究

电子新闻系统是Internet的重要应用之一。为使用户能从众多的新闻组消息中快捷地查找到所需信息，本文建立了基于通用分布式搜索引擎的新闻组搜索系统模型，研究了News信息获取器的工作机制和用户的查询机制。     

内燃机课程教学改革的实践与建议

热能与动力工程专业的内燃机类课程的教材选用、教学内容顺序、教学组织等方面需要改进,应当优选使用课程体系具有好的教学适应性和工程应用性的教材,并将传统的三部分教学内容合而为一。采用校内实践教学与校外实践教学相结合的模式,努力提高学生的学习兴趣,培养学生投身科学研究的愿望。内燃机类课程教学改革的重点是更新教学内容,突出和把握学科动态,注重理论与实践相结合。     

Rocks高性能计算集群的建立和管理

论述了用Rocks集群操作系统来搭建和管理具有高性能计算能力的PC集群的方法和过程,并以目前流行的几种支持并行计算的第一性原理软件包ABINIT及VASP为例,详细说明了Sun Grid Engine(SGE)对用户计算任务管理的方法和因此而显示出的优越性,同时还探讨了各种软件在集群上的加速比问题。     

采用热容计算热量方法的比较

本文讨论了常用的几种采用热容计算热量的方法的准确性及适用性,对我们充分了解和掌握化工过程中热量的正确计算方法具有一定的指导意义.     

Heat maps: a case for inclusion in secondary statistics instruction

Heat maps have become ubiquitous in the media, yet students are rarely exposed to them and their inherent limitations and potential for misleading consumers. This article makes a case for exposing students to them in statistics instruction at the secondary and tertiary level.     

大学生热环境下中等强度运动的热调节反应和生理变化

为探讨大学生热环境下运动的热调节能力和生理变化情况。将18名男性大学生自愿者随机分为热环境运动组(HE组)和室温对照组(NE组),以55%VO2max强度分别在38±1℃和26±1℃环境下(相对湿度皆为73%±3%)进行60min功率自行车运动。每15min测定两组HR、RPE值和直肠温度,统计热环境下HR和RPE的相关关系;测定两组运动前后的体重变化、总出汗率、总出汗量、血尿素和疲劳指数。结果得出:两组被试运动15min HR、RPE组间差异不显著,但30min后HE组HR、RPE值显高于NE组并持续到运动结束;热环境下HR与RPE呈高度相关(r=0.839,P<0.01);运动过程中,NE组Tre低于HE组,运动30min后差异愈发明显;运动前后NE组体重丢失、总出汗量、总出汗率均低于HE组(P<0.05),BUN和FI明显低于HE组(P<0.01)。结论为:热环境下运动对HR、RPE、Tre的刺激更为深刻,并且体重丢失、脱水更为严重,更易导致肌体疲劳。