湿法机械球磨制备片状镍粉研究

以类球形镍粉为原料,进行了湿法机械球磨制备片状镍粉的试验,考察了乙醇体积、球料比、球磨转速、球磨时间及助剂用量等因素对镍粉形貌的影响,采用XRD、SEM等对镍粉结构形貌进行了表征分析,确定了最佳工艺条件:乙醇体积60mL、球料比30:1、球磨转速450r/min、球磨时间3.5h、助剂A用量2%。在该条件下,得到的片状镍粉径厚比89,表面光滑平整,碎片粘附少,具有良好的金属光泽;其微观结构表明,球磨过程中,镍粉的微观内应力逐渐增加,晶粒不断细化;而且产品的片状化程度与<200>择优取向度有关。     

室内热环境、热舒适与工作效率关系的研究

为研究室内热环境与热舒适、工作效率的关系,在镇江和上海的两个工厂采用环境参数测量和问卷方法进行了现场调查。结果表明,热舒适或热中性状态时工作效率不一定为最高,员工效率在稍微凉爽环境下达到最高。并且通过灰色分析得知,当环境温度适宜时,保持室内良好的空气品质能够使员工维持较高的工作效率。     

The Collision between g-C3N4 and QDs in the Fields of Energy and Environment: Synergistic Effects for Efficient Photocatalysis

Recently, graphitic carbon nitride (g-C₃N₄) has attracted increasing interest due to its visible light absorption, suitable energy band structure, and excellent stability. However, low specific surface area, finite visible light response range (<460 nm), and rapid photogenerated electron–hole (e⁻–h⁺) pairs recombination of the pristine g-C₃N₄ limit its practical applications. The small size of quantum dots (QDs) endows the properties of abundant active sites, wide absorption spectrum, and adjustable bandgap, but inevitable aggregation. Studies have confirmed that the integration of g-C₃N₄ and QDs not only overcomes these limitations of individual component, but also successfully inherits each advantage. Encouraged by these advantages, the synthetic strategies and the fundamental of QDs/g-C₃N₄ composites are briefly elaborated in this review. Particularly, the synergistic effects of QDs/g-C₃N₄ composites are analyzed comprehensively, including the enhancement of the photocatalytic performance and the avoidance of aggregation. Then, the photocatalytic applications of QDs/g-C₃N₄ composites in the fields of environment and energy are described and further combined with DFT calculation to further reveal the reaction mechanisms. Moreover, the stability and reusability of QDs/g-C₃N₄ composites are analyzed. Finally, the future development of these composites and the solution of existing problems are prospected.     

生态文明建设与能源、经济、环境和生态协调发展研究

能源、经济、环境、生态(4E)复合系统存在相互影响、相互制约的发展关系,4E的协调发展是生态文明建设与社会可持续发展最终目的。本研究在4E四元发展的博弈性、协同性分析的基础上,本着以人为本的原则,利用层次分析法,构建了4E发展评价指标体系,并采用协调系数法计算出4E系统之间的综合耦合协调度。通过实证研究定量化的表达4E系统协调发展状况,为生态文明建设与4E协调发展决策的制定和选择提供参考依据。     

西北太平洋巴特柔鱼渔场与环境因子关系研究

根据美国NASA提供的卫星遥感反演获取的海表温度、海水叶绿素及海面高度三级数据产品和我国在西北太平洋的巴特柔鱼生产统计资料 ,统计分析了该海域巴特柔鱼资源同海表温度、海水叶绿素浓度及海面高度之间的相关关系。结果显示 :柔鱼的适温范围大致为 10～ 2 2℃ ,最适温度为 15～ 17℃。柔鱼渔场叶绿素浓度大致为 0 .1～ 0 .6mg/m3,叶绿素浓度处于 0 .12～ 0 .14mg/m3之间时 ,渔场出现频次最高。形成渔场海域的海面高度多高于平均海面高度 (SSH >0 )。广义加性模型计算表明 :柔鱼在每年 6～ 8月的北上索饵洄游和 10～ 11月的南下过程中同环境要素的关系表现出不同的特征。SST同柔鱼产量的关系在北上洄游时多为正相关 ,南下时为负相关。 6～ 10月份叶绿素浓度同渔获产量为负相关 ,11月份其相关性较小。渔获产量整体上随经度变化无显著变化 ,相关性较低 ,渔获产量与纬度的关系密切 ,相关性好。     

Investigating the Tool Life, Cutting Force Components, and Surface Roughness of AISI 302 Stainless Steel Material Under Oblique Machining

The aim of this work is to investigate the machinability of austenitic AISI 302 stainless steel under oblique cutting. This can be achieved by studying the cutting forces, analysis of tool life, and investigation of the surface roughness at different cutting conditions and nose radius. A factorial experiment and analysis of variance technique are used in which several factors are evaluated for their effects on each level. The machinability experiments are based on design of experiments to obtain empirical equations for machinability values for machining conditions such as speed, feed, depth of cut, and nose radius. The parameters considered in the experiments were optimized to attain maximum tool life using a response graph and a response table. Based on the response models, dual response contours (tool life and surface roughness as a response and metal removal rate) have been plotted in cutting speed-feed planes. Evaluating the effect of the predominant variables influencing the value of tool life is very important for improving the machined product quality.