无所不能的细菌

以往，人们通常把细菌描绘成可怕的魔鬼。一提起它，大家往往会联想到传播疾病、危害健康的元凶。其实，在细菌大家族里，并不是所有的细菌都在危害人类，亦有许多像“硫磺细菌”一样造益于人类的细菌。     

阅读犹如采矿——谈创造性地开掘教材

语文教材的每一篇课文都是有独特价值的。一位承担过多次公开课的语文教师深有感触地说:"决定公开课成败的,不是谁用了什么‘花招’,而是谁把课文上得最有‘意义’。     

FARMER: A novel approach to file access correlation mining and evaluation reference model

File semantic has proven effective in optimizing large scale distributed file system. As a consequence of the elaborate and rich I/O interfaces between upper layer applications and file systems, file system can provide useful and insightful information about semantic. Hence, file semantic mining has become an increasingly important practice in both engineering and research community. Unfortunately, it is a challenge to exploit file semantic knowledge because a variety of factors could affect this information exploration process. Even worse, the challenges are exacerbated due to the intricate interdependency between these factors, and make it difficult to fully exploit the potentially important correlation among various semantic knowledges. This article proposes a file access correlation miming and evaluation reference (FARMER) model, where file is treated as a multivariate vector space, and each item within the vector corresponds a separate factor of the given file. The selection of factor depends on the application, examples of factors are file path, creator and executing program. If one particular factor occurs in both files, its value is non-zero. It is clear that the extent of inter-file relationships can be measured based on the likeness of their factor values in the semantic vectors. Benefit from this model, FARMER represents files as structured vectors of identifiers, and basic vector operations can be leveraged to quantify file correlation between two file vectors. FARMER model leverages linear regression model to estimate the strength of the relationship between file correlation and a set of influencing factors so that the “bad knowledge” can be filtered out. To demonstrate the ability of new FARMER model, FARMER is incorporated into a real large-scale object-based storage system as a case study to dynamically infer file correlations. In addition FARMER-enabled optimize service for metadata prefetching algorithm and object data layout algorithm is implemented. Experimental results show that is FARMER-enabled prefetching algorithm is shown to reduce the metadata operations latency by approximately 30%–40% when compared to a state-of-the-art metadata prefetching algorithm and a commonly used replacement policy.     

乔后盐厂成立

乔后盐厂位于洱源县以西70公里,地处罗坪山西麓狭长河谷黑潓江畔的千年白族古镇乔后,南距下关120公里。党和政府十分重视关系民生的盐业生产。1955年1月,为配合生产,乔后盐业批发站迁到乔后北坡新盐厂区。7月,又撤销乔后迤西盐矿     

内胎与外胎

汽车在泥泞的路上飞驰,沾满污泥的外胎极不满意长期的露天生活,怒气冲冲地对内胎说:你的生活太美好了,我在外面风吹日晒,你却天天躲在里面睡大觉,太不公平了!内胎只是挺了挺肚子,没有回答。     

稻草——田野里的财富

1 引言 秋收已进入尾声,秋冬生产拉开帷幕,岳阳县月田镇的田野上一片忙碌的景象.月田镇陈伏村一农民——陈威名,正在自家已收割完毕的稻田上收拾稻草,他的身后矗立着几个稻杆搭成的草棚.谈及这些草棚,陈大叔一脸的开心,他告诉我们,这是他为种植蘑菇搭建的.陈大叔说因为家里没有养牛,往年收割后稻草跟很多农户一样在田里就焚烧了,不仅浪费稻草还污染环境弄得乌烟瘴气,而在学习了蘑菇种植技术后,家里的稻草都用来种蘑菇,这些稻草除了搭棚之外还是种菇的好基质,来年收菇之后发酵过的稻草还田还是上好的肥料,没想到不起眼的稻草给自己带来了可观的财富.     

我和小姐姐克拉拉

茵可夫，德国著名儿童文学作家。大学时代学习采矿专业，毕业以后长期从事记者和编辑工作。一九七三年开始儿童文学创作。出版过九十五部作品，其中一部分被译成二十四种文字在各国出版。这本《我和小姐姐克拉拉》被评论界誉为“描写童趣的当代儿童文学经典之作”。     

东北大学国家级教学成果奖“《采矿学》教材建设”教学改革成果总结

针对在内容体系上与21世纪采矿专业知识结构的信息化、数字化、生态化和国际化之间的适应性问题,《采矿学》确立了"硬技术与软科学并重,国内实用和与国际接轨兼顾,体现最新研发成果"的知识内容体系。考虑到采矿中大量单体技术和方法的融会贯通问题,以及引入"软科学"理论和方法后新产生的与"硬技术"有机结合问题,《采矿学》将"以采矿方式方法和工艺过程为主线,把相关单体技术和方法置于主线上的对应应用点上"作为教材整体结构框架。针对采矿工程所特有的时空动态特征给学生带来的在建立三维空间概念和工程时序概念上的困难,东北大学采矿所的老师们研发了一系列关于采矿工程结构和工艺过程的三维动画短片,很好的帮助了学生在建立三维空间和时序概念中的困难。《采矿学》(第2版)作为采矿工程专业课的主导教材,在内容结构体系上的时代性和系统性已经得到业界的广泛认可,并被评为国家级教学成果二等奖。     

我和杂技今生有约

20世纪五六十年代,在重庆解放碑闹市中心的夫子池,有一个大众游艺园。它是一个综合性娱乐场所,内有小剧场、小电影院、露天舞台、阅览室、餐厅、茶馆、糖果店等。剧场里曾演出过川剧、京剧、豫剧、河北梆子、话剧、木偶剧等,而露天舞台则轮流演出歌舞、杂技、曲艺等。花2角5分钱买一张门票,就可在里面从早玩到晚,任意观看所有的演出,深受群众欢迎。那个年代,群众娱乐方式不多,除了看电影就只有舞台演出了。大众游艺园既有看的又有玩的,光进门的那面把