悬浮预热器中的换热分析

本文通过分析悬浮预热器的传热机理,讨论了颗粒的加速过程和换热时间对分散和换热的影响,论述了分散不良引起的“准短路”对分散、换热及能量损失的影响,并指出可以通过温熵图计算不可逆损失。     

夫伦克耳激子的运动

本文从晶格模型出发,同时考虑周期场和电子-声子相互作用对激子能态的影响。夫伦克耳激子在晶格中运动有两种不同方式:在低温区,是能带传递;在高温区,是跳跃过程。     

Energy flow and community structure in freshwater ecosystems

The goal of this article is twofold: 1) It aims at providing an overview on some major results obtained from energy flow studies in individuals, populations, and communities, and 2) it will also focus on major mechanisms explaining community structures. The basis for any biological community to survive and establish a certain population density is on the one hand energy fixation by primary producers together with adequate nutrient supply and the transfer of energy between trophic levels (bottom-up effect). On the other hand, predator pressures may strongly control prey population densities one or more trophic levels below (top-down effect). Other interpopulation effects include competition, chemical interactions and evolutionary genetic processes, which further interact and result in the specific structuring of any community with respect to species composition and population sizes.     

正规BCI-代数的“拟-广结并”构造

本文进一步讨论BCI—代数的拟结合部分的特征性质,引入正规BCI—代数的概念。同时给出一种构造正规BCI—代数的“拟—广结合并”方法。     

2,3-二羟基哌嗪与几种氨基化合物的缩合反应研究

由乙二胺与乙二醛的缩合物２,３－二羟基哌嗪,分别与甲酰胺、脲和乙二胺反应,制得２,４,７,９,１１,１４－六氮杂三环［８,４,０,０３,８］十四烷六盐酸盐四水合物（１）,２,５,７,９－四氮杂双环［４,３,０］壬－８－酮二盐酸盐－水合物（２）和２,５,７,１０－四氮杂双环［４,４,０］癸烷（３）。化合物１为未见文献报道的新化合物。化合物２的合成工艺条件优化后,反应得率与文献［１］相比有一定提高。化合物３的合成,由于将反应分为低温和高温两个缩合阶段,使反应得率提高到７７．５％。     

建立人输卵管上皮细胞无血清培养

人输卵管上皮细胞（HOEC）可以体外较长时间无血清培养,DMEM／F12培养液的培养效果优于Ham’sF10,在加有多种因子和胎球蛋白的培养液中,HOEC可贴壁生长,生长能力达到合质量分数15％FCS的对照组的30％～40％,一般可传代2次,最长培养可维持38d,细胞形态与有血清培养差别不大,虽然无血清培养HOEC的生长速度、密度、传代成功率远不及有血清培养,但能抑制成纤维细胞生长,维持较纯的上皮细胞。     

苯甲酰类化合物构效关系的模式识别研究

用ＣＮＤＯ／２量化方法计算了３５个苯甲酰类化合物的量化指数,并应用模式识别方法研究了该类化合物的结构对治疗患Ｌ１２１０肿瘤小鼠药效的影响,得到满意的分类图。结果表明化合物的抗癌活性的主要影响因素为ＣＱＳ、ＥＬＵＭＯ、ＥＳＨＥＰ和π,药物的抗癌活性主要是通过抑制核苷酸还原酶所致,而且化合物在体内到达受体的过程和难易程度对药效的影响较大。     

大立体角多参数电离室

因重离子核物理研究工作研究,研制成功灵敏区深庶３５ｃｍ的大立体角多参数电离室,可同 量信号△Ｅ、Ｅ和位置信号Ｘ、Ｙ等多项参数。     

The v-v energy transfer of highly vibrationally excited states (I)

The relaxation of the highly vibrationally excited CO (v = 1–8) by CO₂ is studied by timeresolved Fourier transform infrared emission spectroscopy (TR FTIR). 193 nm laser photolysis of the mixture of CHBr₃ with O₂ generates the highly vibrationally excited CO(v) molecules. TR FTIR records the intense infrared emission of CO(v→v-1). The vibrational populations of each level of CO(v) have been determined by the method of spectral simulation. Based on the evolution of the time resolved populations and the differential method, 8 energy transfer rate constants of CO(v = 1–8) to CO₂ molecules areobtained: (5.7±0.1), (5.9±0.1), (5.2±0.2), (3.4±0.2), (2.4±0.3), (2.2±0.4), (2.0±0.4) and (1.8±0.6) (10¹⁴ cm³ · molecule⁻¹ · s⁻¹), respectively. A two-channel energy transfer model can explain the feature of the quenching of CO(v) by CO². For the lower vibrational states of CO, the vibrational energy transfers preferentially to the u³ mode of CO² For the higher levels, the major quenching channel changes to the vibrational energy exchange between CO(v→v-1) and the u¹ mode of CO².     

The v-v energy transfer of highly vibrationally excited states (II)

The vibrational energy transfer from highly vibrationally excited CO to H₂O molecules is studied by time-resolved Fourier transform infrared emission spectroscopy (TR FTIR). Following the 193 nm laser photolysis of CHBr₃ and O₂ the secondary reactions generate CO(v). The infrared emission of CO(v → v−1) is detected by TR FTIR. The excitation of H₂O molecules is not observed. By the method of the spectral simulation and the differential technique, 8 rate constants for CO(v)/H₂O system are obtained: (1.7 ±0.1), (3.4 ±0.2), (6.2 ±0.4), (8.0 ±1.0), (9.0 ±2.0), (12 ±3), (16 ±4) and (18 ±7) (10¹³cm³ · molecule^-1· s^-1). At least two reasons lead to the efficient energy transfer. One is the contributions of the rotational energy to the vibational energy defect and the other is the result of the complex collision. With the SSH andab initio calculations, the quenching mechanism of CO(v) by H₂O is suggested.