Surface ozone observations during voyages to the Arctic and Antarctic regions

Surface ozone concentration and UV-B data between 75° N and 70° S were obtained aboard the Chinese polar scientific vessel “Xue -long” (Snow-Dragon) during the first voyage to the Arctic and the 16th to the Antarctic in 1999–2000. Analysis of these data presents that variations of the surface ozone concentration have small amplitude during voyages except the mid-latitude in the Northern Hemisphere. As a whole, average surface ozone concentration in the Northern Hemisphere is higher than that in the Southern, and high value occurred when the ship sailed close to the continents. The average diurnal variations of the surface ozone in the Northern Hemisphere are also higher compared to the southern counterparts, and high diurnal variations were found at low latitudes, and relative low level in the polar region.     

{110}晶面暴露的BiOCl制备及光催化活性研究

利用溶剂热法可控制备了{110}晶面暴露的Bi OCl纳米微球并以甲基橙染料为目标污染物考察其光催化性能.利用XRD和SEM对纳米微球的晶体结构及形貌进行表征.通过与共沉淀法制备氯氧铋的光催化性能对比发现,在降解甲基橙溶液的过程中,高能晶面{110}暴露的Bi OCl纳米微球在紫外光和可见光下都展示出较高的光催化活性.     

基于博弈论集对分析模型的机坪管制运行风险评价

考虑大型机场机坪管制运行风险评价因素的不确定性,提出了基于博弈论集对分析模型的机坪管制运行风险评价模型。根据机坪管制运行的业务流程,构建了涵盖“人、机、环、管”四个方面的机坪管制运行风险评价指标体系。基于博弈论思想将层次分析法得到的主观权重和熵权法得到的客观权重进行最优组合来确定各指标权重;根据集对分析理论的同异反模型来计算样本的综合联系度,由此确定机坪运行风险等级和发展趋势,并提出合理的安全建议。最后通过实例验证,得到各样本评价结果与实际情况基本相符,证明了该评价模型的可靠性。     

Synthesis, supramolecular structures and luminescent properties of quinacridone derivatives bearing carbazole groups

The syntheses of three carbazyl-containing quinacridone derivatives, N,N’-di((N-carbazyl)-n-butyl) quinacridone (DCBQA), N,N’-di((N-carbazyl)-n-hexyl)quinacridone (DCHQA) and N,N’-di((N-carbazyl)-n-octyl)quinacridone (DCOQA), are reported, and the photoluminescent (PL) characteristics are pre- sented. The single crystal X-ray structures of DCBQA, DCHQA and DCOQA are investigated. The crystal of DCBQA is characterized by intermolecular π…π interactions between quinacridone cores and carbazole moieties result...     

动物肝损伤组织花生四烯酸代谢物水平的变化

以水牛、大鼠为对象,采用感染肝片吸虫的生物性和由ＣＣｌ４导致的化学性致肝脏损伤两种方法,探讨了肝损伤组织匀浆水某些花生四烯酸代谢物的水平变化。结果表明：水牛和大鼠肝损伤后,肝组织匀浆中ＰＧＥ２、ＴＸＢ２和６－ｋｅｔｏ－ＰＧＥ１α水平均升高或明显升高,花生四烯本代谢物变化大小与肝脏损伤程度直接有关,一些花生四烯酸代谢物是参与或介导不同致病因素引起的肝脏损伤的重要促炎介质。     

宝华山不同演替群落下的土壤微生物状况

研究了初夏季节宝华山自然保护区中处于不同演替阶段的次生裸地、纯盐肤木（Ｒｈｕｓｃｈｉｎｅｎｓｉｓ）林以及青冈（Ｃｙｃｌｏｂａｌａｎｏｐｓｉｓ ｇｌａｕｃａ）－栓皮栎（Ｑｕｅｒｃｕｓ ｖａｒｉａｂｉｌｉｓ）混交林下的土壤,调查分析了细菌（Ｂａｃｔｅｒｉａ）、放线菌（Ａｃｔｉｎｏｍｙｃｅｔｓ）、真菌（Ｆｕｎｇｉ）和固氮菌（Ｎｉｔｒｏｇｅｎ－ｆｉｘｉｎｇ ｂａｃｔｅｒｉａ）的数量及组成。结果表明：处于演     

椭圆曲线密码引擎算法的设计与实现

针对Ｉｎｔｅｌ体系结构ＭＭＸ＾ＴＭ处理器的特点,设计并实现了一种椭圆曲线密码体制（ＥＣＣ）算法,提出一种ＥＣＣ数学模型,结合具体的公钥加密方案,推导出一种点积运算的快速算法。在Ｉｎｔｒａｎｅｔ／Ｉｎｔｅｒｎｅｔ环境下,为开发者提供了一种利用ＥＣＣ开发电子商务安全、数据保密通信等应用的通用算法模型,使ＥＣＣ实时及实用成为可能。     

Sign series entropy analysis of short-term heart rate variability

Complexity and nonlinearity approaches can be used to study the temporal and structural order in heart rate variability （HRV） signal, which is helpful for understanding the underlying rule and physiological essence of cardiovascular regulation. For clinical applications, methods suitable for short-term HRV analysis are more valuable. In this paper, sign series entropy analysis （SSEA） is proposed to characterize the feature of direction variation of HRV. The results show that SSEA method can detect sensitively physiological and pathological changes from short-term HRV signals, and the method also shows its robustness to nonstationarity and noise. Thus, it is suggested as an efficient way for the analysis of clinical HRV and other complex physiological signals.     

基于信用等级迁移的信用违约互换定价

研究了参考债券具有信用等级结构的信用违约互换(CDS)的定价.考虑债券处于不同的等级,且债券的违约强度和回收率随着债券在等级间的迁移不断变化;基于转移矩阵和回收率向量,构建了常微分方程组(ODE)方程来求解信用违约互换的或有赔付和保费支付的价值,并给出了其解析解,从而确定了CDS保费费率和CDS的价值.最后通过数值分析验证理论结果.     

1Cr18Ni9Ti激光表面熔覆合金结构相的研究

１Ｃｒ１８Ｎｉ９Ｔｉ不锈钢的表面Ｃｏ基材料的激光熔覆，在熔覆层表面形成了致密的微结构，基体与熔覆层间的热影区内，基体元素的固溶度明显增加，位错能降低，在热影响区还发现了孪晶产生，根据Ｍ谱研究确诊有多种Ｆｅ、Ｃ固溶相的存在。