梯形网络的简易解法

为简化无穷多阶梯形网络输入阻抗的计算,采用了菲波那契数列方法,较现行求输入阻抗的传统计算方法简便、快捷、准确,使该类问题的计算更为方便.     

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.     

重庆市三峡库区医疗垃圾现状及无害化处理分析

医疗垃圾属于一类危险废物，必须进行无害化处理。文章论述了医疗垃圾的特性和危害性，对重庆市三峡库区目前医疗垃圾管理和处理的现状进行了分析，针对其特点，提出对三峡库区医疗垃圾有效的管理措施和进行分区集中处理，具体分析了医疗垃圾处理技术方案：分类收集、密闭运输、预处理、焚烧、完全填埋等。通过无害化处理后，杜绝医疗垃圾对环境的污染，以保护三峡库区生态环境和水资源。     

概率一致假想地震及在砂土液化小区划中应用

对文献提出的用点源模型确定假想地震的方法作了进一步的改进和补充，给出了用断层破裂模型确定想地震的方法，并首次尝试运用概率一致的假想地震进行砂土液化的评估，为进行以概率为基础的砂土液化小区划找到了一条捷径。     

弗里德曼消费函数和持久收入

对弗里德曼消费函数和持久收入进行了较深入的研究，进一步阐明了弗里德曼经验公式所对应的经济环境，并得出一个新的持久收入估计公式．     

加入WTO对我国科技期刊的宏观影响

加入WTO以后，中国科技期刊将在理念、政策及管理环境、竞争环境、布局结构以及其它相关因素等方面发生的深刻变化。科技期刊应该尽快树立与WTO规划相适应的意识和理念，按WTO的要求，加快自身的调整，增强核心竞争力，从而在日趋激烈的竞争条件下，获得继续生存与发展的空间。     

人类8型疱疹病毒K1基因真核表达载体的构建

为构建人类8型疱疹病毒(Human herpesvirus 8,HHV-8)K1基因的真核表达载体,采集卡波氏肉瘤(Kaposi's sarcoma,KS)患者血清,采用柱式病毒DNA抽提试剂盒抽提血清中的病毒DNA,采用套式PCR技术检测HHV-8的特异性片断KS330233以判断是否得到了HHV-8 DNA,采用PCR技术扩增HHV8 K1基因并纯化回收,酶切、连接入真核表达载体pcDNA3.1,转化大肠杆菌DH5α,挑取阳性克隆pcDNA3.1/HHV8-K1扩增后,提取质粒,进行双酶切和DNA测序鉴定.结果显示采集了经典型KS血清3例,提取了血清HHV-8DNA,扩增了特异性片断KS330233,测序结果正确提示我们得到了HHV8 DNA,扩增了HHV8 K1基因,构建了pcDNA3.1/HHV8-K1真核表达载体,经限制性内切酶酶切鉴定及测序分析证实了其序列的正确性.由此可知:成功构建了pcDNA3.1/HHV8-K1真核表达载体,为进一步研究该基因的功能奠定良好的实验基础.     

Ionization and dissociation of acetonitrile by intense femtosecond laser pulse

Photoionization and photodissociation of CH3CN were studied by a linear time of flight mass spectrometer coupled with 800 nm, 50 fs laser pulses at intensities of 6.3×1013-1.2×1014 W/cm2. The laser power dependences for principal ions CH3CN+, CH2CN+, CHCN+ and CCN+ were measured, which are consistent with the numbers of photons required to produce the ions via multiphoton ionization and dissociation. The results show that eight-photon non-resonant multiphoton ionization is the main photoionization mechanism of the parent ion CH3CN+, while the fragment ions were produced through the dissociation of the molecules in the super-excited states.     

垃圾填埋场沼气控制与利用的方案评选法

为了保护环境,实现对垃圾填埋场气体的资源化利用,目前国内外对垃圾填埋场气体采取了广泛的控制利用方案。笔者从环境、经济和社会的整体效益出发,提出沼气利用方案的评价指标体系,并采用层次分析法进行了方案的优选,对合理作出决策提供科学依据。