松茸群生物资源及其合理利用与有效保护

论述了国产松茸群的分类地位、种类组成、地理分布、生态环境及其在松、栎森林生态系统中的作用,资源现状及其日趋减少的原因分析。重点讨论了松、栎类植物群落自然演替及人类活动对松茸群的影响,其中人类活动是影响松茸群生长繁衍生存诸因素中最主要的因素,概括有二：①森林大面积的无度连续砍伐,导致生态系统环境的恶化,地下菌丝明显减少；②掠夺性的采集方法使有序的地下菌丝及其正常分化与发育受到严重干扰。建议建立特种自然保护区,将松茸类增写到《中国植物红皮书》中；采取实施人工接种于林地以增加森林生态系统中地下菌丝蕴藏量和补充菌丝不足、促进发育与分化以增加自然生物量,林木砍伐采用间伐与菌根育苗造林相接合以及科学的采集方法等是合理永续利用和有效保护的根本途径。     

镦挤变形的数值模拟

建立了镦挤变形的模式,采用上限元技术模拟了镦挤变形的全过程,并讨论了摩擦和模口尺寸等参数对变形力和金属流动的影响。     

"混凝气浮+BAC+纳滤"工艺在污水回用工程中的应用

介绍了中国石油克拉玛依石化分公司的污水深度处理及回用工程的工艺流程、特点及运行效果。该工程以该公司的污水处理场二级出水为原水，采用“混凝气浮 BAC 纳滤”进行深度处理及进行脱盐处理，出水水质超过了当地的自来水指标，已经代替自来水被实际应用于循环水系统的补充水。     

糠醛项目评估要点的探讨

玉米加工时产生大量玉米芯,在农村主要用于做饭、取暖的燃料烧掉,而玉米芯中富含高聚糖(纤维素、半纤维素),是生产糠醛的主要原料.目前哈尔滨市周围也建设了几家糠醛厂,其产生的废水、废气对环境污染较重,本文叙述了糠醛生产工艺,原辅料的理化性质,污染物排放情况等内容,提出糠醛项目的评估要点.通过对糠醛项目的评估,使其产业政策及选址符合性、污染防治措施、事故风险措施等更加符合要求,可有效提高环评文件的编制质量,使评估工作真正起到为审批机关严把技术关,又起到为企业负责的作用.     

纤维层表面非稳态过滤研究

根据纤维层表面过滤的“尘滤尘”现象 ,应用颗粒过滤理论建立了纤维层表面非稳态过滤效率的数学模型。对比研究表明该模型能较深刻地揭示了非稳态过滤过程随过滤时间的变化规律 ,从而对深化纤维过滤器的净化机理的认识、提高过滤效率、延长滤料使用寿命、加强清灰管理等方面有理论及应用意义     

钻头套缺口的冲裁加工

对钻头套缺口的冲裁加工进行可行性分析 ,优化设计冲模 ,并对其进行强化热处理 ,提高冲模使用寿命。     

我国主要水系(清洁河段)河水溶氧水平及影响因素

应用我国水文年鉴上５０年代末至９０年代初期大量的实测数据，研究我国主要水系清洁河段河水溶氧水平与温度，纬度，海拔高度，泥沙含量和离子强度等因素的关系。     

Kinetic analysis of anaerobic phosphorus release during biological phosphorus removal process

Enhanced biological phosphorus removal (EBPR) is a commonly used and sustainable method for phosphorus removal from wastewater. Poly-β-hydroxybutyrate (PHB), polyphosphate, and glycogen are three kinds of intracellular storage polymers in phosphorus accumulation organisms. The variation of these polymers under different conditions has an apparent influence on anaerobic phosphorus release, which is very important for controlling the performance of EBPR. To obtain the mechanism and kinetic character of anaerobic phosphorus release, a series of batch experiments were performed using the excessively aerated sludge from the aerobic unit of the biological phosphorus removal system in this study. The results showed that the volatile suspended solid (VSS) had an increasing trend, while the mixed liquid suspended sludge (MLSS) and ashes were reduced during the anaerobic phosphorus release process. The interruption of anaerobic HAc-uptake and phosphorus-release occurs when the glycogen in the phosphorus-accumulating-organisms is exhausted. Under the condition of lower initial HAc-COD, HAc became the limiting factor after some time for anaerobic HAc uptake. Under the condition of higher initial HAc-COD, HAc uptake was stopped because of the depletion of glycogen in the microorganisms. The mean ratio of Δρ _P/Δρ _PHB, Δρ _GLY/Δρ _PHB, Δρ _P/ΔCOD, was 0.48, 0.50, 0.44, and 0.92, respectively, which was nearly the same as the theoretical value. The calibrated kinetic parameters of the HAc-uptake and phosphorus-release model were evaluated as follows: Q _HAc,max was 164 mg/(g · h), Q _P,max was 69.9 mg/(g · h), K _gly was 0.005, and KCOD was 3 mg/L. An apparently linear correlation was observed between the ratio of Δρ _P/ΔCOD and pH of the solution, and the equation between them was obtained in this study. Translated from Acta Scientiae Circumstantiae, 2005, 25(9), 1164–1169 [译自: 环境科学学报]     

挤压变形对MB15镁合金及组织性能的影响

对MB15镁合金进行热处理,然后进行挤压试验,挤压变形MB15镁合金组织以剪切条纹和细小的α再结晶等轴晶为基本特征。挤压变形可显著地细化镁合金晶粒并提高镁合金的力学性能。随挤压比的增大,晶粒细化程度增加;强度、硬度随挤压比的增大而增大。所制定的工艺合理,挤压出的管材、型材有较好的力学性能。