模具成形过程中虚拟仿真环境研究

此文提出了一种基于先进制造技术、并行工程、知识工程及网络技术于一体的虚拟仿真系统思想——VS,对其组织方式、结构模型、环境关键技术和发展前景作了尝试性地探讨研究。这将有助于整个模具制造业找到一个新的应用发展突破点,真正体现高速、高效、高质的优势。     

概率稀释模型及其在污染物总量控制中的应用

本文简要介绍了概率稀释模型的理论基础及其改进方法，以肥城市康汇河为例，应用该模型确定了河流污染物各总量控制方案下的水质目标及其达标率，阐明了该模型在水体污染物总量控制中的应用。     

Performance and microbial response during the fast reactivation of Anammox system by hydrodynamic stress control

Anaerobic ammonium oxidation （Anammox） has become a promising method for biological nitrogen removal. However, this biotechnology application is always limited due to the low growth rate and biomass yield of Anammox bacteria. This study investigated the process of fast reactivation of an Anammox consortium idled for 2 years uia hydrodynamic stress control. The results showed that the Anammox system was efficiently and quickly reactivated by shortening of the hydraulic retention time （I-IRT） of the reactor from 12 to 6 hr within 68 days of operation. Moreover, at a 4-hr HRT with an influent total nitrogen loading rate of 1.2 kg N/（m3.day）, the reactor maintained high biological performance with an ammonium removal loading rate of 0.52 kg N/（m3.day） and a nitrite removal rate of 0.59 kg N/（m3.day）. In the reactivated Anammox reaction, the stoichiometric coefficients of NH4-N to NOE-N and NH4-N to NO4-N were 1：1.04± 0.08 and 1：0.31 ± 0.03, respectively. The specific Anammox activity and hydrazine oxidoreductase activity, both of which represent the degree of Anammox bacteria present, increased as the hydrodynamic stress increased and were maximally （125.38 ± 3.01 mg N/（g VSS.day） and 339.42 ± 6.83 μmol/（min.g VSS）, respectively） at 4-hr HRT. Microbial response analysis showed that the dominant microbial community was obviously shifted and the dominance of Anammox bacteria was enhanced durinR the hydrodynamic selection.     

吹扫捕集-气相色谱-质谱法测定水中环氧氯丙烷的不确定度评定

依照《测量不确定度评定与表示》,对吹扫捕集-气相色谱-质谱法测定水中环氧氯丙烷的结果进行不确定度评定。通过评定可知标准曲线配制过程所引入的相对不确定度最大,吹扫捕集-气相色谱-质谱法测定模拟水样中环氧氯丙烷结果为（78±21）μg/L。     

军山湖河蚬的种群动态及生产量研究

2005年4月-2006年3月年间对军山湖河蚬进行了周年逐月采集,对河蚬的种群动态进行了分析,并采用Brey经验公式测算了军山湖河蚬周年生产量。结果表明,河蚬周年平均生物量为115.84 g/m2,平均密度为51.93 ind./m2。种群密度及生物量峰值出现在58、月5,月分别为90.67 ind./m21,87.39 g/m2;8月分别为72 ind./m2,170.67 g/m2。密度及生物量在次年3月份为最低值,分别为27.2 ind./m2,58.88 g/m2。河蚬周年生产量(AFDW)为10.86(g/m2.yr),P/B系数为0.52,结果较为合理。P/B系数较低,说明这一资源日趋贫乏,需要合理的保护利用。     

Effects of anthropogenic activities on hydrochemical characteristics of ground water of Da’an irrigation area in Western of Jilin Province

Environmental Science and Pollution Research - The groundwater environment changes under the influence of anthropogenic activities. Because of the construction of the Da’an irrigation area,...     

Degradation of Polypropylene by the Pseudomonas aeruginosa Strains LICME WZH-4 and WGH-6

Journal of Polymers and the Environment - In the present study, two strains of Pseudomonas aeruginosa, WZH-4 and WGH-6, were isolated based on their ability to survive with polypropylene (PP) as...