《大公报》中的另类社会广告与近代中国社会

《大公报》作为清末创刊的重要大众传媒,其广告以丰富的内容为人们展现了社会多方面的信息,而其中反映民意民情的社会广告,就占有一定的比例,它们是特定历史条件下的产物,是社会文明进步的新气象,也是近代中国平民社会觉醒的真实写照。通过对这些广告的分析和研究,能使我们更全面、立体地了解当时的社会转型和近代广告在中国发展的轨迹,并对今天转型社会的发展提供可资借鉴的经验。     

膨化料的特点及用于小鼠的试验研究

本研究通过对两种类型饲料的比较，发现没传统的干烤鼠料相比，膨化过程在对饲料做熟化、臌化处理以提高适口性的同时，还兼有一定的灭菌作用；此外，膨化时短时间高温高压对饲料中不稳定养分一维生素类破坏作用弱。膨化料比干烤鼠料硬、不易破碎，浪费少。用膨化料饲喂生长、繁殖实验小鼠，也获得了同干烤鼠料相同的饲喂效果。因此认为膨化料不仅适用于实验犬、猴、也是一种较为理想的实验小鼠饲料。     

电脑日历时钟及定时控制器

本文给出了在单片机的控制下ＭＣ１４６８１８日历时钟及控制器的一种使用方法，实现了掉电状态下的时钟运行，数据保存，和控制信息处理，体现了ＭＣ１４６８１８芯片在实时控制方面的优点。     

CAI实验仿真软件设计与实现

计算机辅助教学软件是当前高校较为流行的研究课题，是提高教学质量的极为有效的手段。文章介绍了ＣＡＩ与仿真技术，展示了控制系统ＣＡＩ实验仿真软件结构及应用效果，并探讨了ＣＡＩ实用技术与应用前景。     

Zr基合金/ZrC在1253K下的润湿行为及前驱膜形成条件研究

采用改良座滴法研究了Zr基合金Zr50Cu50、Zr50Cu40Al10和Zr55Cu30Al10Ni5与ZrC在1 253K下的等温润湿行为及界面结构。结果表明,3种Zr基合金与ZrC的润湿,随着组元种类的增加润湿性逐渐改善,同时形成了前驱膜,且前驱膜的宽度随组元种类的增加而变宽。热力学分析表明,前驱膜的形成需要满足固-液界面上有强烈的相互作用,同时又能保持弱的界面反应性;铺展动力学分析表明,带有前驱膜特征(即吸附润湿)的铺展可以用分子动力学模型来描述。     

Solvent-free selective hydrogenation of o-chloronitrobenzene to o-chloroaniline over alumina supported Pt nanoparticles

A supported Pt/Al2O3 catalyst was prepared by immobilizing preformed colloidal Pt nanoparticles on Al2O3. The particle size and size distribution of Pt particles on Al2O3 remained the same as the colloidal nanoparticles. Selective hydrogenation of o-chloronitrobenzene to ochloroaniline was performed on the as-prepared Pt/Al2O3 nanocatalyst without using any solvent and 88.5% selectivity to o-chloroaniline at 98.2% conversion of o-chloronitrobenzene was achieved. Further catalytic experiments with metal cation modification showed that some metal cations could improve the activity in various degrees while maintaining the high selectivity. Especially, 99.8% selectivity to o-chloroaniline at ~100% conversion was attained with Sn4t.     

数控编程中的图形变换分析

利用数学方法和图形学理论对数控编程中的图形变换进行了分析．其目的是借助图形变换手段提高数控编程的精确度和效率，检验刀具轨迹的正确性，改进零件加工质量，提高企业经济效益     

(e,2e)反应中剩余电子的屏蔽效应

在考虑了He原子(e,2e)过程中剩余电子对核的有效屏蔽之后,用修正后的BBK理论计算了入射能为40eV时,共面不对称几何条件下电子入射离化He原子的三重微分截面(TDCS)。结果表明:得到的理论曲线更接近实验数据     

互联网ISP服务质量的监测

衡量网络服务提供者（ISP）优劣的指标是服务质量，但目前许多ISP还缺少对服务质量的监测，本文探讨服务质量监测的原理和方法，以及主要服务类别的各项指标和测试方法，并给出了一些监测实例。     

The DNA concentration effect on DNA radiation damage induced by <Superscript>7</Superscript>Li ions and γ rays

To evaluate the influence of the DNA concentration in the aqueous solution on DNA radiation damage, the plasmid DNA in the presence or absence of Mannitol （scavenger of free radical OH.） was irradiated by ^7Li ions and γ rays at various DNA concentrations. Gel electrophoresis analysis revealed that the DNA damage of single and double strand breaks induced by irradiation became more severe at lower DNA concentration. In the condition of γ-ray irradiation, most of double strand breaks （DSB） damage was neutralized and less associated with DNA concentration in the presence of mannitol. However, under ^7Li irradiation, DSB damage could not be cleared by mannitol but was gradually aggravated with decreasing DNA concentrations. These findings imply that under low-LET irradiation, most of the DSB damage is generated by free radical OH·diffusion, and thus may be counteracted by scavengers, while at higher-LET irradiation, quite a fraction of DSB induction is caused by direct ionizing energy deposition of heavy ions, which cannot be eliminated. This work also indicates that the proportion between free radical damage and direct ionizing damage is s constant which is independent of DNA concentration when the DNA concentration is under a certain value （50ng/μL）. Our study sheds light on the un- derlying mechanisms in the DNA radiation damage process.