KDP晶体电光调制器件的研制及性能测试

本文介绍了KDP晶体的横向电光调制器件的设计原理与制备工艺，利用所制备的电光调制器件进行激光通信模拟实验，并对有关性能参数的测试方法和结果进行讨论。     

Cloning and bacterial expression of sesquiterpene cyclase, a key branch point enzyme for the synthesis of sesquiterpenoid phytoalexin capsidiol in UV-challenged leaves of Capsicum annuum

The optimal prophylactic strategy for cytomegalovirus (CMV) disease after allogeneic hematopoietic stem cell transplantation has not yet been established. The aim of this study was to analyze our single-center experience with a uniform protocol of CMV antigenemia-guided pre-emptive treatment with ganciclovir (GCV) after allografting. Fifty-two consecutive adult patients, 48 of them transplanted from HLA-identical matched related donors were included. T cell-depleted marrow or peripheral blood were used in 21 cases. After engraftment, weekly blood samples were tested for CMV pp65 antigenemia and viremia (conventional cultures) until day +100. GCV was started if CMV antigenemia and/or CMV viremia were detected. CMV infection (CMV-I) was found in 19 patients (37%). Seven patients suffered from CMV disease (CMV-D), three colitis and four pneumonias. There was one death directly related to CMV-D and three further cases died from refractory GVHD with CMV-D. Only one patient developed CMV pneumonia without any previous positive antigenemia and/or viremia. Multivariate analysis identified grades II-IV acute GVHD (P = 0.02) and peripheral blood stem cell transplantation (P = 0.03) to be risk factors for developing CMV-I. In conclusion, this monitoring protocol allowed early treatment of CMV-I without progression to CMV-D. Pre-emptive therapy had the additional advantage of avoiding GCV administration in most of our allograft recipients.     

一种单相双输入九电平逆变器及其调制策略

由于传统多电平逆变器存在电路结构复杂、功率器件多、控制复杂等缺点,提出一种单相双输入九电平逆变器,通过2个直流输入电源与电容的串并联实现九电平输出,拓扑结构简单,能够以较少的功率器件和电容数量产生更多的输出电平,谐波含量低,并且其多输入结构适用于分布式发电和微电网等领域。首先给出逆变器的电路结构和工作原理,然后设计逆变器调制策略,并分析电容充放电过程及其对电压波动的影响,实验结果验证了所提九电平逆变器及其调制策略的有效性和可行性。     

氯离子对硫化铜精矿浸出的影响

硫化铜精矿中含斑铜矿63%,黄铜矿16.1%.在中温加压酸浸条件下,铜浸出率很低.研究了氯离子的加入对铜浸出率的影响.结果表明,氯离子的存在改善了硫化物的包裹结构,使铜浸出率得到较大幅度提高,达到94%以上.     

广州市某高层商住楼地下室工程裂缝分析

针对高层建筑地下室外墙出现的裂缝,通过统计和计算,分析其产生的原因,以及应该采取的预防措施。     

某铜矿选矿工艺试验研究及经济效益初步评价

对该铜矿矿石性质进行了初步研究及探索性条件试验,发现原生产流程存在着不足,对原生产工艺流程进行技术改进,使铜精矿品位提高1．88％,回收率提高2．91％。经济效益的初步计算表明,该新工艺每年可多回收铜金属约90t,净利润达150万元／a,实现了矿山资源扩大化和增收创税的双重目标。     

某氧化锌矿浮选试验研究

对某氧化锌矿进行光谱分析、物相分析及多元素分析,结果表明该氧化锌矿的氧化率在98%以上,且矿石中锌矿物成分复杂,主要以菱锌矿和异极矿形式产出,根据该矿的矿物学特征,采用一次粗选、一次扫选、两次精选的选别流程,以L—06为捕收剂,闭路试验表明,锌精矿品位≥25%、回收率≥78%。     

Integrability and non-integrability in quantum mechanics

The concepts of integrability, non-integrability and chaos in quantum mechanics are examined, and it is indicated that they all are sensibly definable only in connection with the corresponding properties of their classical analogues. The concrete examples concern the quantum and classical properties of dynamic systems on SU₃ algebra and classically integrable but quantum nonintegrable system with two degrees of freedom.     

二-(4-羟基丁基)聚二甲基硅氧烷改性聚氨酯/脲的合成及性能研究

以二-(4-羟基丁基)聚二甲基硅氧烷(HB-PDMS)和聚乙二醇为(PEG)软段,2,4-甲苯二异氰酸酯(TDI)为硬段,合成了一系列不同硬段含量的聚氨酯/脲(PU)和有机硅改性聚氨酯/脲(SiPU)。通过FT-IR、DSC、TG及吸水率表征了PU和SiPU的结构及性能。结果表明,相对于PU,SiPU的耐水性随SiPU中HB-PDMS含量的增大而逐渐增强,聚硅氧烷的引入虽然降低了PU的初始热降解温度,但其在高温区的热稳定性增强。