摘要：Soil phosphomonoesterase plays a critical role in controlling phosphorus(P) cycling for crop nutrition,especially in P-deficient soils.A 6-year field experiment was conducted to evaluate soil phosphomonoesterase activities,kinetics and thermodynamics during rice growth stages after consistent swine manure application,to understand the impacts of swine manure amendment rates on soil chemical and enzymatic properties,and to investigate the correlations between soil enzymatic and chemical *** experiment was set out in a randomized complete block design with three replicates and five treatments including three swine manure rates(26,39,and 52 kg P ha^(-1),representing low,middle,and high application rates,respectively) and two controls(no-fertilizer and superphosphate at 26 kg P ha^(-1)).The results indicated that the grain yield and soil chemical properties were significantly improved with the application of P-based swine manure from 0 to 39 kg P ha^(-1);however,the differences between the 39(M_(39)) and 52 kg P ha^(-1) treatments(M_(52)) were not *** enzymatic property analysis indicated that acid phosphomonoesterase was the predominant phosphomonoesterase in the tested *** M_(39) and M_(52) treatments had relatively high initial velocity(V_0),maximal velocity(V_(max)),and activation grade(lgN_a) but low Michaelis constant(K_m),temperature coefficient(Q_(10)),activation energy(E_a),and activation enthalpy(ΔH),implying that the M_(39) and M_(52) treatments could stimulate the enzyme-catalyzed reactions more easily than all other *** correlation analysis showed that the distribution of soil phosphomonoesterase activities mainly followed the distributions of total C and total *** on these results,39 kg P ha^(-1) could be recommended as the most appropriate rate of swine manure amendment.

摘要：垂直流湿地具有占地面积小、投资少、除污效率高等特点,但运行管理较复杂.为简化其管理,设计了一个无阀垂直流湿地小试系统,介绍了其构造,并模拟农村生活污水的排放规律在冬季进行了污水处理试验.结果表明：当水力负荷为8.5 cm/d时,黑麦草无阀垂直流湿地对有机物具有良好的去除效果,对COD的去除率达85%,出水COD＜50 mg/L;该湿地对TN的去除效果稳定,去除率为50%左右;对TP的去除率为93.5%～54.2%,并随运行时间的延长而下降.

摘要：对桥梁工程施工中出现的安全事故进行了原因分析,阐述了桥梁工程施工中的安全控制措施及安全管理要点,提出桥梁工程施工时应坚持"安全第一,事前预防,综合治理"的原则,抓好安全管理,以确保施工安全性,杜绝安全事故。

摘要：针对BER(电化学生物膜反应器)的传质问题,设计了MBER(磁场-电化学生物膜反应器).通过对不同电流强度下BER和MBER中NO3--N,NO2--N,NH4+-N和TN去除或产生情况的对比,以及不同电流强度下电流利用效率的分析发现,在HRT为10 h,温度为25℃,进水pH为7.8,进水ρ(NO3--N)为30 mgL的运行条件下,MBER对NO3--N的去除率高出BER13%～38%,MBER对TN的去除率高出BER 10%～30%.且MBER在电流强度为70 mA时就达到最高去除率,而BER则需要电流强度为80 mA时才能达到最高去除率.试验证明磁场的存在促进了BER反硝化,提高了电流利用效率,使得MBER可以在较低电流强度下达到优于BER的脱氮效果.

摘要：本文针对盘锦城区砂土液化不良地质作用,采用工程地质勘察中的原位测试——标准贯入试验法结合前人在此所作的地质调查资料和工程地质勘察资料,按照《建筑抗震设计规范》(GB5001-2001)相关规定,对盘锦城区的砂土液化进行相应的等级分区,对于盘锦市今后的工程建设具有实用意义。

摘要：针对振动试验中夹具的动力学设计和验证问题,探讨了仅根据响应输出进行模态参数识别的时域分析方法,即特征系统实现算法。以某夹具结构为研究对象,仅通过测试宽带随机激励下的加速度响应信号,对该夹具的模态参数进行了识别。在Matlab7.1上实现了一种基于相关函数的特征系统实现算法,利用加速度响应数据计算相关函数矩阵,并构造广义Hankel矩阵,得到了夹具的模态频率和阻尼比。奇异值分解和稳定图综合分析结果表明:特征系统实现算法能较好地对结构的动力学参数进行识别。

摘要：土壤氮磷平衡是评价农田生态系统氮磷迁移损失的有效工具。文章从土壤氮磷平衡的定义、分类及模型计算表达出发,结合国内外土壤氮磷平衡研究实例,探讨了土壤氮磷平衡的分析过程,并提出了土壤氮磷平衡研究的新动向。

摘要：介绍了制定室内模拟运输试验条件的一种技术方法。以运输距离、运输速度及路面等级给出的运输环境条件可以采用空间频率功率谱密度(PSD)描述,进而获得以时间频率PSD描述的室内模拟运输试验条件。文中还分析了确定的路面等级的空间频率PSD的波动以及运输速度对于室内模拟运输试验条件量级的影响,结果表明:相同的运输环境条件,其室内模拟运输试验条件振动量级可以具有的波动范围;相同的路面等级,运输速度与试验条件振动量级成正比。工程应用中可以针对不同产品的设计要求来剪裁使用。

摘要：采用序批式摇床培养,在污泥中分别接种10%的氧化亚铁硫杆菌菌液与氧化硫硫杆菌菌液,研究了不同菌种对生物淋滤法去除城市污泥中重金属Zn和Cu效果的影响。结果表明,氧化亚铁硫杆菌能够较快速启动生物淋滤,使污泥系统中的Zn在第2d就有了97.8%的去除,并保持到结束;Cu在第4 d有了37%的去除并持续升高。而氧化硫硫杆菌则在第6 d才对Zn和Cu有了较好的去除。2种金属的溶出与pH值有一定的相关性,Zn在pH值3.0￣4.0时就有很高的去除率,而Cu在pH<3.0时才有较好的去除。在去除重金属的同时,污泥中营养成分(TN、TP、TK、有机质)的损失也较高,特别是TP的损失量最高可达到70%。以氧化亚铁硫杆菌为优势的生物淋滤系统中污泥的营养损失大于氧化硫硫杆菌为优势的系统。

摘要：Loesses are widely distributed all over the world,especially in ***,long-term agricultural irrigation and extreme climate changes have led to frequent geological disasters in the Heifangtai area of Lanzhou,Gansu,*** these,landslides are one of the most frequent types of disasters that are harmful to humans and the environment.A landslide is closely related to the lithology,structure,and groundwater of the site and consists of a combination of structure units divided by discontinuities,such as faults,joints,and fi ***,geological surveys,engineering drilling,and trenching are typically used to identify the stratum lithology,structure,and groundwater in order to visually display underground information within a limited depth ***,these methods have *** particular,geological surveys can only describe geological phenomena on the surface,while the cost of drilling and trenching may be high,along with the ineffi ciency of *** this research,the integrated geophysical exploration method was used to analyze the hidden joints,cracks,and other discontinuities and geophysical features of the *** results were verified by trench exploration,and large amounts of underground information were obtained,especially the spread and distribution of discontinuities in landslide *** information can be effectively used for carrying out and providing meaningful experiences and lessons in future comprehensive geophysical processing and interpretations related to the prediction and evaluation of landslides.