高岭土尾砂在高强混凝土中应用的试验研究

利用机械力活化方法,对高岭土尾砂进行了活化研究,采用对比试验,对活化后的高岭土作混凝土掺合料配制C70高强混凝土的力学性能和耐久性进行了研究.结果表明,经过机械力火化后的高岭土的活性与偏高领土相近.高强混凝土中掺入高岭土不仅能满足强度等级要求,而且能提高混凝土的渗透性,具有显著的经济效益与社会效益.     

显性无腺体作标记性状在陆地棉杂种优势利用中的初步研究

选用陆地棉无腺体品系显无066 和显无077 为父本,有腺体品种中棉所12 号、苏棉9 号、泗棉3 号为母本,不去雄辅助授粉,以显性无腺体作标记,以天然异交和人工去雄授粉为对照,比较其杂种率及制种效率,并以中棉所12 号为对照,对6 个杂交组合的杂种F1 进行比较。结果表明:以显性无腺体作标记,不去雄辅助授粉平均杂种率达到51.35% ,变幅34.73% ～63.46% ,工效是人工去雄的3.5 倍。杂种F1 比较试验表明,所研究的11 个性状中有10 个性状表现中亲优势,6 个性状表现超亲优势,8 个性状表现竞争优势,其中3 个组合的单株皮棉产量竞争优势在20% 以上。     

例谈高职数学知识在解决经济问题中的应用

高职数学知识在经济问题的解决中应用已十分广泛，培养学生掌握应用所学数学知识解决实际问题是高职数学教育的根本任务，对高职经管专业学生数学教育的根本任务是培养学生将所学的数学知识运用到相关经济专业课学习中去的能力。现结合高职院校经济管理类的专业特点举例讨论高等数学知识在解决经济问题中的应用。     

Research on the atomic force microscopy-based fabrication of nanochannels on silicon oxide surfaces

The atomic force microscopy (AFM)-based nanomachining of nanochannels on silicon oxide surfaces is investigated both theo-retically and experimentally. The relationships of nanochannel depth versus cutting velocity, nanochannel depth versus normal force, friction force versus cutting velocity, and friction force versus normal force are systematically studied. Using the derived theory and fabrication method, a nanochannel with an expected depth can be machined simply by controlling the vertical deflection signal on the position sensitive detector of AFM. The theoretical analysis and fabrication method can be effectively used for AFM-based fabrication of nanochannels.     

An atomic force microscopy study of coal nanopore structure

Coal nanopore structure is an important factor in understanding the storage and migration of absorbed gas in coal. A new method for studying coal nanopore structures is proposed. This idea is based on the nano-level resolution of atomic force microscopy, which can be employed to observe the structural features of coal nanopores clearly, conduct quantitative three-dimensional measurements and obtain structural parameters. Analysis results show that coal nanopores are mainly metamorphic pores and intermolecul...     

从《庸言》易主看民初新闻传播界的新动向

《庸言》创刊于1912年,正是中华民国建立之初,当时资产阶级革命派获得政权,对于言论的控制相对较弱,报刊界进入繁荣发展时期,《庸言》在这时创刊,适应了社会的发展。创刊初期梁启超为主编,追求独立自由的新闻思想,报刊内容以政论为主,他想通过办报实现自己的政治理想。1914年《庸言》主编改为黄远生,改变了原来以政论为主的做法,增加了新闻和时评,《庸言》开始与报刊界由＂言论启蒙＂到＂事实为主＂的大趋势相一致。     

试析图书馆实行目标管理的可行性

图书馆管理是一门科学。对定额管理与目标管理的优劣进行了分析,提出了图书馆实行目标管理的观点,探讨了目标管理实施过程中应注意的问题。     

Dependence of the stability of organic light-emitting diodes on driving mode

We investigated the effects of pulsed current (PC) and direct current (DC) driving modes on the stability of organic light-emitting diodes with and without hole-injection layers (HILs).Two different HIL materials were used:copper phthalocyanine (CuPc) and 4,4’,4″-tris(3-methylphenylphenylamino)triphenylamine (m-MDTATA).It was found that the half-lives of devices using PC driving modes were different from those of comparable devices using DC driving modes.For the devices without HILs,with CuPc HILs and with MTDATA HILs,the half-lives of the devices were changed by factors of 1.91,1.41 and 0.86,respectively,when operated in PC rather than DC driving modes.Our analysis of the electrical characteristics of the corresponding hole-only devices showed that the number of holes injected into devices was greatly reduced by inserting an m-MTDATA layer compared with other designs.The results indicate that different ratios of injected electrons and holes can be obtained in these devices.Moreover,these ratios play a dominant role in the dependence of the stability of the device on the driving mode.     

汽车行驶记录仪抗干扰技术的研究

为了保证汽车行驶记录仪可靠稳定的工作,提高其抗干扰能力,文章在对汽车行驶记录仪的干扰源进行分析研究的基础上,针对不同干扰源提出了软、硬件抗干扰措施。     

山区高速公路隧道进出口偏压的处治对策

新建的山区高速公路，在复杂的地质和地形地貌条件下，隧道进出口往往处于浅埋偏压地段，由此造成了一系列的工程问题，已引起隧道工程人员的广泛重视。针对不同的地形、地质条件分析了洞口偏压的成因，并提出了相应的处治措施，可为隧道施工提供参考。