南洋理工大学计算机本科教育介绍

南洋理工大学公开资料表明,其计算机本科教育包括计算机工程和计算机科学两个专业,各有6到8个方向。两个专业方向大部分内容是重叠的。学生修满154学分可获工学学士学位。需修读的专业课为21到23门,共70学分;专业选修课6门,24学分;通识课13门,36学分;实践包含设计/创新项目、工业实习、毕业项目,共24学分。其课程设置紧跟学科发展潮流和行业应用需求。本文对该校的本科教育进行了详细介绍。     

Cooperative games with nontransferable utility on antimatroids

This paper introduces a new family of nontransferable utility (NTU) games with partial cooperation. Games with transferable utility (TU) restricted by antimatroids were studied since 2004. Antimatroids are known combinatorial structures which are interpreted in games as dependency situations among a group of agents, and they generalize several other hierarchical structures studied in the literature. Now we define projected NTU games over antimatroids following the same idea. We have needed to build a new theory about projections between two coalitions. In this case, an outcome is feasible for a coalition if and only if its projection is feasible in the NTU game. This paper studies several properties of the projected games and the relations between these games and the original game for some interesting cases: TU games, hyperplane games and bargaining problems.     

Exact and approximate formulas for cross flow heat exchangers with unmixed fluids

This article addresses the calculation of the effectiveness of a single-pass cross-flow heat exchanger where the two fluids are not mixed. The author proposes an exact formula which is more convenient than using infinite series expansions as has been proposed until now.     

Entwicklung einer leistungsstarken Mikrorektifikationsapparatur für analytische und präparative Anwendungen

In this contribution it is reported about the realization of efficient micro rectification equipment (MRA), which can be operated intermittently or continuously and be used both for analytical as well as for preparative separations of mixtures of liquid substances. Different binary systems were separated. A theoretical separation stage number of 12 was obtained together with a height equivalent to one theoretical plate of 1.08 cm. Compared to the state of microtechnology this can be regarded as an excellent progress.     

接触式烟气-水冷凝换热器的热工计算方法

对接触式烟气-水冷凝换热器的换热效率进行了分析,充分考虑影响换热效率的各种因素,包括喷嘴雾化粒径和换热器高度等,给出了接触式烟气-水冷凝换热器的热工计算方法,并制作了线算图。采用所提出的热工计算方法,对具体示范工程烟气-水冷凝换热器进行了设计,供暖季现场实测数据表明,烟气-水冷凝换热器的换热性能达到了预期目标。     

Retreatment of silicon slurry by membrane processes

The purpose of the present study is to develop a process to regenerate the polish liquid used in Chemical and Mechanical Polishing (CMP), called “slurry”, and more specifically Silicon CMP slurry. Physico-chemical analyses show a considerable dilution of slurry through washing waters used in polishing. Thus, this effluent has been characterised for a better identification of the deviations from the slurry of reference (Point Of Use). Hence, the principle is to regenerate this effluent by membrane processes. The ultrafiltration results obtained at laboratory scale have led to the development of an industrial prototype. An optimal utilisation of this treatment allows completing a two-step process: the reconcentration by ultrafiltration and a chemical adjustment by addition of concentrated slurry. A stable behaviour of the slurry at the different steps of the process has been observed. Polishing results are similar with retreated and POU slurries. Furthermore, the functioning at industrial scale permits to maintain the performances obtained on the laboratory pilot.     

Separation of Pollutants from Restaurant Wastewater by Electrocoagulation

Abstract

Of late, electrocoagulation has been widely used to treat a wide variety of wastewaters, including textile, dye, electroplating, chemical mechanical polishing wastewaters, etc. Excessive coagulant material may be avoided by electrocoagulation. The contaminants present in wastewaters are maintained in solution by electrical charges. When metal ions of opposite electric charge, provided by an electrocoagulation system, may become unstable and precipitate in a form that is usually very stable. The present work involves the treatment of nearby restaurant effluent in Surat, Gujarat, India. Two different electrodes, aluminum and iron, are used for electrocoagulation. The effect of applied voltage and time of electrolysis on various parameters—such as conductivity, COD, TDS, and turbidity are studied. The removal efficiency of COD is found to be between 50–72% and the optimum time is between 15–30 minutes. Electrocoagulation proved to be a process which could neutralize pH significantly. The major impact of change in electrode is considered and aluminum is found to be better than iron in many respects. The operating cost is estimated from the power cost and cost of electrode material.     

冷却水流量对凝汽器性能影响的试验研究

通过试验进行了冷却水流量对凝汽器性能的影响研究,得到了凝汽器压力、传热系数和传热端差随冷却水流量的变化规律。试验结果表明,在本试验参数范围内,随着冷却水量增加,凝汽器压力成近似线性减小,传热系数成近似线性增加。冷却水流量对凝汽器端差影响存在临界值。理论分析表明,传热系数采用美国热交换学会(HEI)公式计算时,凝汽器传热单元数(NTU)大于1.59,则端差随冷却水流量增加而增加;NTU小于1.59,则端差随冷却水流量增加而减小,与试验结果完全吻合。     

Novel storage technologies for raw and clarified syrup biomass feedstocks from sweet sorghum (Sorghum bicolor L. Moench)

Attention is currently focused on developing sustainable supply chains of sugar biomass feedstocks for new, flexible biorefineries. Fundamental processing needs identified by industry for the large-scale manufacture of biofuels and bioproducts from sweet sorghum (Sorghum bicolor L. Moench) include stabilization and concentration of juice into syrup for long-term storage, year-round supply, efficient transport, and acceptable end-product yields. Pilot plant studies were conducted to evaluate the storage (up to 160 days at ∼25 °C) of raw and clarified syrups from sweet sorghum hybrid and commercial cultivars. Clarified syrups were manufactured after clarification of juice (80 °C; 5 ppm polyanionic flocculant) at various target limed pHs (6.1–6.8) followed by vacuum evaporation. All 70 Brix raw syrups were susceptible to microbial deterioration on the surface during storage, and raw syrups were more susceptible than clarified syrups. Surface deterioration was mainly fungal since bacterial growth was inhibited by low water activity. Juice clarification reduced the loss of fermentable sugars during the evaporation stage and, generally, allowed for better storage of syrup up to 80 days. Target clarification pH had a dramatic effect on the storage of clarified 70 Brix syrups with more acidic pHs reducing fungal deterioration. Further studies are now warranted on the post-evaporation pH adjustment of raw and clarified syrups to <6.1 for long-term storage. Inexpensive soy bean oil and candellila wax showed promise as surface sealants to preserve syrups for at least 80 days of storage at ∼25 °C, also warranting further investigation.     

紫外分光光度法测COD影响因素研究

以沈阳建筑大学校园人工湖水为水样,考察浊度和pH值对紫外分光光度法测试COD所产生的影响。结果表明：当水样无机浊度或有机浊度含量较低时,不会对COD的测定产生影响,但含量较高则要考虑对相关方程进行修正。水样的pH值=1.8～9.0时,COD基本没有变化,当pH〉9.5时,影响COD的测定结果。