试论我国贫困山区的持续发展

本文从可持续发展的角度考察了贫困山区长期落后的原因，分析了贫困山区可持续发展面临的４个主要问题，并针对问题提出了相应的对策、建议。     

环己酮装置废碱液分离技术的工业应用

为解决环己烷氧化法制备环己酮中氧化液废碱的分离问题，提出了将重力沉降技术、旋流分离技术和聚结分离技术依次串联组合的梯度分离技术，同时采用较为先进的两段逆流碱洗工艺，实现水的循环利用。该技术在巴陵石油化工有限责任公司80kt/a环己酮生产装置上的应用结果表明，当一级碱洗分离器进口Na+含量在2.92%～3.20%，经过碱洗分离系统处理后，聚结器出口有机相中Na+的质量浓度由改造前的6 mg/L以上降低为3mg/L以下，聚结器出口有机相中水含量由改造前的0.1%~0.2%降低为0.05%左右。环己酮生产工艺中烷蒸馏塔工作周期由改造前的平均2个月延长至9个月以上，实现整套装置长周期稳定运转。同时，降低了生产成本，减少了环境污染。     

特大洪水在荆江河段演进模拟研究

针对荆江-洞庭湖复杂河网系统规模庞大、水流复杂特点，为模拟特大洪水在长江荆江河段的演进过程，建立了一、二维联算洪水演进模型，其中河道与湖区采用一维河网模型，分蓄洪区水流采用二维模型模拟。分别采用1996年及1998年水文资料对模型进行了率定和验证，取得了较好的结果。将模型模拟应用于荆江特大洪水调度，根据计算结果，启用荆江分洪区、虎西备蓄区、浣市扩大分洪区、人民大垸蓄洪区、洪湖分蓄洪区，且上百里洲扒口行洪时能确保荆江大堤安全。     

The influence on immersion time of titanium conversion coatings on electrogalvanized steel

The study aims to replace chromate treatments of electrogalvanized steels by immersing the electrogalvanized steel in a titanium trichloride (TiCl₃) bath. The influence of immersion time on surface morphology and corrosion resistance of the titanium conversion coatings was investigated. The titanium conversion coating prepared for 300 s immersion time with a uniform structure has the most excellent anticorrosive performance. Furthermore, the coating comprises a loose outer layer and a dense inner layer structure with a thickness of 150 nm. X-ray photoelectron spectroscope analysis shows that the coating consisted of Zn and Ti oxides and/or hydroxides.     

合成丙酮酸及其酯类的反应体系热力学计算与分析

采用Yoneda基团贡献法估算了丙酮醛、丙酮酸和丙酮酸甲酯的标准生成焓Δ_f H_m~θ、标准S_m~θ以及拟合等压热容曲线。结合丙酮醛氧化酯化合成丙酮酸及丙酮酸甲酯反应的热力学数据,对丙酮醛氧化制备丙酮酸及丙酮酸酯化制备丙酮酸甲酯的摩尔焓变Δ_rH_m~θ,吉布斯自由能变Δ_r G~θ和反应平衡常数K进行了计算与分析。结果表明,丙酮醛氧化制备丙酮酸的反应为强放热反应,标准状态下Δ_r_m~θ;为—319.3 kJ/mol,丙酮酸酯化制备丙酮酸甲酯的反应为弱的放热反应,标准状态下Δ_rH_m~θ成为—61.73 kJ/mol;两个反应的吉布斯自由能变在考虑的温度范围内均为负值,且丙酮醛氧化温度为450K时,反应的焓变有最小值—345kJ/mol丙酮酸及丙酮酸甲酯的转化率较高。     

用古马隆制取酚醛树脂常温固化剂的研究

介绍了以古巴隆为原料制取的热固性酚醛树脂常温固化剂的性能、影响因素及固化条件，提出了用常温固化剂鉴别酚醛树脂的粘结性能及预测镁碳砖耐压强度的方法。     

Quality Control Parameters for Robotic Bridge Painting

To protect a steel bridge from corrosion, periodic painting is needed. Bridge painting operations are dangerous and hazardous to human health. A robotic bridge painting system is being developed to replace the human being. One major problem with robotic bridge painting is how to achieve the specified coating quality, which includes two aspects: (1) the coating thickness; and (2) the coating appearance. To ensure quality of the robotic bridge painting, the writers have investigated: (1) the parameters that affect the coating thickness and appearance; (2) the values of the parameters to achieve the required thickness and appearance for the robotic painting; and (3) the thickness distribution functions of the bridge painting under various conditions. The specified painting quality can be achieved by using the results of this study to set up and control the robotic bridge painting system.     

Zero-forcing equalizability of FIR and IIR multichannel systemswith and without perfect measurements

We study the linear zero-forcing equalizability of a communication channel. Necessary and sufficient conditions are given in terms of the zeros of the transfer function. Detailed procedures of equalizer design for minimum sensitivity with respect to modeling errors and white noise are also presented. It is found that the worst case effect of channel mismatch on the performance may be modeled as equivalent losses in signal-to-noise ratio     

高速光纤通信线路DmB1M码型初探

本文介绍分析一种适合超高速光传输线路码型——DmB1M码的构成及其功率谱特性;并试制了D10B1M码的编/解码器;认为该码型有其独特的优点并适于超高速光传输系统。