时域多分辨率法分析二维光子带隙结构的色散特性

采用时域多分辨率法分析计算了在TM波情形下二维介质光子带隙结构的色散曲线．分别在介质柱的相对介电常数εr＝10．2，20．2的算例中选取较粗网格(约为细网格的3倍)，其计算结果在精度上与采用细网格的时域有限差分法相同，但均明显地节省了计算内存和时间。     

添加剂对TiO2电流变液性能的影响

研究不同添加剂对电流变液流变性能的影响，以提高ER液体的电流变活性。对含有不同添加剂的电流变液体进行了电流变性能测试。结果表明：几种添加剂对改善电流变液体的性能均有很好的促进作用。在4kV／mm的电场强度下，含不同添加剂的电流变液体的剪切应力分别提高12％、26％和33％。且ER液体的抗沉淀稳定性明显提高。说明适宜、适量的添加剂能有效地提高ER液体的性能。     

利用单片机实现直流他激电机的无触点无级调速系统

以比例式零压法为基础 ,提出了直流他激电机的无触点无级调速控制方案和对低压电机用场效应管替代晶闸管的办法 .利用单片机直接控制晶闸管 ,解决了触点寿命问题 .通过单片机的计数口检测电机轴脉冲轮的脉冲信号可实现电机的速度控制和位置控制 .检测和控制都避开了 A/D和 D/A转换 ,具有一定的实用价值 .     

Advances in identification and application of tumor antigen inducing anti-cancer responses

Tumor antigen is one of the important bases of tumor immunotherapy . With the discovery of novel tumor antigens, interest in specific immunotherapy for treatment of malignancies has increased substantially. Nowadays more and more scientists paid close attention to various tumor antigens with their roles or/and applications in anti-cancer immune responses, immune tolerance, tumor markers,     

In-vehicle GPS/DR navigation system development and test results in Singapore

This paper introduces the in-car navigation system prototype development and test results under the context of Singapore. In the system, integrated GPS/DR is used for continuous vehicle positioning. A digital road network map database is built for the whole Singapore. The database is designed to support map matching, route determination, and route guidance functions. The prototype system demonstrates GPS positioning of the vehicle in real-time, tracking the vehicle onto a digital map with fix updates every one or two seconds.With the map matched vehicle location on the map, voice and/or text guidance is provide to the driver. The vehicle position can also be transferred to control centre through communication data link for the purpose of fleet management.     

Design and application of 60mer oligonucleotide microarray in SARS coronavirus detection

In April 2003, a novel coronavirus[1,2] which was associated with cases of Severe Acute Respiratory Syn-drome (SARS) was first isolated and sequenced in Canada. The genome of SARS coronavirus (SARS-CoV) is 29727[3] nucleotides in length and has 11 known open reading frames (ORFs). Although the genome organiza-tion of this virus is similar to that of other coronaviruses, phylogenetic analyses and sequence alignment show that SARS-CoV is not closely related to any of the previously ch…     

Temperature variations on the Tibetan Plateau over the last two millennia

The paleoclimate data recovered from ice cores,tree rings and lake sediments indicate regional features of cfimatic change on the Tibeta n Plateau (TP) during the last 2000 years. The composite temperature reconstructions in-dicate that several main climatic episodes, such as the “LittleIce Age“ between 1400 and 1900, the “Medieval Warm Pe-riod“ in 1150-1400, a less warm period in 800-1100, and an earlier cold period between the 3rd and 5th centuries,occurred in the TP. In addition, temperature varied from region to region. The period from AD 800 to 1100, which waswarm in northeastern TP, was contemporaneous with cool-ing in the western and southern TP. The southern TP ex-perienced warming between 1150 and 1400. For western TP,the δ^18O records of the Guliya ice core indicate that the pe-Hod 1250-1500 witnessed a clear warming. Large-scaletrends in the temperature history from northeastern TP aremore similar to those in eastern China than are the trendsfrom the Guliya ice cap far to the west and southern TP. The most prominent similarities between the temperature varia-tions of the TP and eastern China are such cold phases as 1100-1150, 1500-1550, 1650-1700 and 1800-1850, andthe latter three cold events match with three widespreadg lacial advances which occurred on the TP during the Little Ice A2e.     

抗菌剂及抗菌材料的发展和应用

综述了近年来抗菌剂在国内外的研究开发及抗菌材料的应用发展状况，探讨了抗菌剂在今后几年内的发展方向，指出国内抗菌剂在发展中需要注意的问题。     

变频调速技术在滴灌中的应用

以实地试验资料为依据，分析了变频调速技术对大棚滴灌均匀度的影响及其应用于大棚滴灌的节能效果。结果表明，在同时工作的大棚数相同的情况下，水泵变频运行时的最大滴灌均匀度与水泵工频运行时的最大滴灌均匀度最大相差不超过2％，而水泵耗电量却前者只有后者的27％；同时工作的大棚数不同，变频压力需作相应的调整，以便能达到较高的滴灌均匀度；变频调速技术在大棚滴灌中具有较为明显的节能效果，其节能为65．7％～78．6％．     

交通噪声预测的神经网络模型

运用 Matlab语言编程 ,构造预测交通噪声的 LM算法 BP神经网络模型 ,把预测因子 (轻、重型车流量、平均车速、受声点距路肩距离、敏感点高差 )作为样本输入到网络模型 ,噪声等效声级作为样本输出 ,反复训练网络 ,通过增加隐含层节点数、改进算法 ,以降低误差 ,缩短训练时间。