Gravitational perturbation of hydrogen spectrum in the space curved by intense laser pulses

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试题库管理信息系统

本文叙述了大工试题库管理信息系统(DUTTQBMIS)在Foxpro2.5B for Windows3.X和Window95平台上的总体设计思想及一些具体处理方法。该系统实现了题库编辑、考题选择、考题调整、考题打印及系统管理等功能,具有随机性强、成卷速度快、调整余地大、打印样式多、操作灵活方便等特点,可广泛应用于教学工作中。     

优化上海研究生学位论文 随机抽检系统的探析

上海市研究生教育多年来坚持以学位论文作为质量监控主要抓手,开展博士、硕士学位 论文答辩前的随机抽检与“双盲”评议工作,不断促进研究生培养质量的提高。同时随机抽检结果也 用做检验高校质量保障体系运行和作用分析的依据。本文主要介绍项目的优化历程、理念演进,分 析项目的创新机制与成效,进而达到总结和推广的作用。     

原子反弹激光中的光放大

本文引入了一种介于普通激光和自由电子激光之间的光放大机制,然后对其进行数值模拟,揭示了光放大的本质,并讨论原子密度、气体介质体积等工作参数对光放大的影响,对原子反弹激光有很好的指导意义。     

用Excel 2000实现"考场临时抽签"

本文结合Excel宏命令、随机函数以及排序等功能,介绍了一种“考场临时抽签”的计算机实现方法.     

三维激光扫描系统的应用研究

本文就三维激光扫描成像系统的原理和发展趋势做了简要的叙述,以工程应用实例对三维激光扫描成像系统的工作流程和三维建模做了详细的说明,并对三维激光扫描系统采集的点云数据处理的方法和手段进行了研究。     

Effects of parameters in femtosecond laser micromachining on ablation of silicon

A series of ablation experiments on silicon surface by femtosecond laser system of 775 nm and 150 fs duration pulses were carried out.The morphological characteristics and the associated effect in the ablation were tested by atomic force microscope (AFM),scanning electron microscope (SEM),focused ion beam (FIB),and the optic microscope.The single pulse threshold can be obtained directly.For the multiple pulses,the ablation threshold varies with the number of pulses applied to the surface due to the incubation effect.By analyzing the experimental data,the thresholds of laser fluences under various laser pulse numbers were obtained,and the relationships between ablation area and laser energy and laser pulse number were concluded.Meanwhile,the periodic ripple structure on silicon surface was found.Under the condition of certain laser power,the number of laser pulse can influence the formation of ripples.     

外语自主学习模式中词汇随机性测试系统的开发与应用

文章探索了用微软office工具Excel实现外语词汇随机性测试的方法,提出的词汇随机测试模型包括测试词语抽取随机性和受试学生选择随机性两个维度。提出的周期性随机测试模型遵循人类大脑记忆原则,符合大脑的记忆遗忘规律,可以用作外语自主学习模式中学生形成性评价的一个重要工具。     

Protective effects of photobiomodulation against resistance exercise-induced muscle damage and inflammation in rats

We investigated whether low-level laser therapy (LLLT) prior to or post resistance exercise could attenuate muscle damage and inflammation. Female Wistar rats were assigned to non-LLLT or LLLT groups. An 830-nm DMC Laser Photon III was used to irradiate their hind legs with 2J, 4J, and 8J doses. Irradiations were performed prior to or post (4J) resistance exercise bouts. Resistance exercise consisted of four maximum load climbs. The load work during a resistance exercise bout was similar between Control (non-LLLT, 225 ± 10 g), 2J (215 ± 8 g), 4J (210 ± 9 g), and 8J (226 ± 9 g) groups. Prior LLLT did not induce climbing performance improvement, but exposure to 4J irradiation resulted in lower blood lactate levels post-exercise. The 4J dose decreased creatine kinase and lactic dehydrogenase levels post-exercise regardless of the time of application. Moreover, 4-J irradiation exposure significantly attenuated tumor necrosis factor alpha, interleukin-6, interleukin-1β, cytokine-induced neutrophil chemoattractant-1, and monocyte chemoattractant protein-1. There was minor macrophage muscle infiltration in 4J-exposed rats. These data indicate that LLLT prior to or post resistance exercise can reduce muscle damage and inflammation, resulting in muscle recovery improvement. We attempted to determine an ideal LLLT dose for suitable results, wherein 4J irradiation exposure showed a significant protective role.     

Clones identification of Sequoia sempervirens (D.Don) Endl.in Chile by using PCR-RAPDs technique

A protocol of polymerase chain reaction-random amplified polymorphic DNAs (PCR-RAPDs) was established to analyse the gene diversity and genotype identification for clones of Sequoia sempervirens (D.Don) Endl.in Chile.Ten (out of 34) clones from introduction trial located in Voipir-Viilarrica,Chile,were studied.The PCR-RAPDs technique and a modified hexadecyltrimethylammonium bromide (CTAB) protocol were used for genomic DNA extraction.The PCR tests were carried out employing 10-mer random primers.The amplification products were detected by electrophoresis in agarose gels.Forty nine polymorphic bands were obtained with the selected primers (BG04,BF07,BF 12,BF13,and BF 14) and were ordered according to their molecular size.The genetic similarity between samples was calculated by the Jaccard index and a dendrogram was constructed using a cluster analysis of unweighted pair group method using arithmetic averages (UPGMA).Of the primers tested,5 (out of 60) RAPD primers were selected for their reproducibility and high polymorphism.A total of 49 polymorphic RAPD bands were detected out of 252 bands.The genetic similarity analysis demonstrates an extensive genetic variability between the tested clones and the dendrogram depicts the genetic relationships among the clones,suggesting a geographic relationship.The results indicate that the RAPD markers permitted the identification of the assayed clones,although they are derived from the same geographic origin.