遗传神经网络在煤层自燃预测中的应用

煤层开采自燃危险性程度与许多影响因素之间存在着复杂的非线性关系，利用人工神经网络技术和人工生命学中的遗传算法，建立了预测模型，不但很好地解决了该问题，同时也大大提高了运算速度。     

土层分层厚度对场地地表地震动参数的影响

以江淮地区典型场地资料为原型,选取不同的土层分层厚度,构造多种场地土层计算模型,选择Taft、Kobe和El Centro三条强震记录作为地震输入,采用一维频域等效线性化波动方法分析了分层厚度对场地地表地震动参数的影响。研究表明:土层分层厚度对场地地震动参数存在影响,主要表现为采用较大分层厚度计算得到的地表峰值加速度A_(max)和反应谱特征周期T_g相对偏低,应采用尽可能小的土层分层厚度;分别采用1.0m和2.0m分层厚度计算得到的地表加速度反应谱形状基本重合,A_(max)和T_g也基本一致,最小选取2.0m土层分层厚度可以满足工程精度的要求。     

Review of advances in the thin layer chromatography of pesticides: 2010–2012

Techniques and applications of thin layer chromatography (planar chromatography) for the separation, detection, qualitative and quantitative determination, and preparative isolation of pesticides and their metabolites and some related pollutants are reviewed for the period from November 1, 2010 to November 1, 2012. Analyses are described for a variety of samples types and pesticide classes. In addition to references on residue analysis, studies such as pesticide structure – retention relationships, identification and characterization of natural and synthesized pesticides, metabolism, degradation, mobility, lipophilicity, and mechanism of action are covered.     

利用酸法和酶法水解玉米芯发酵生产木糖醇

利用稀硫酸和纤维素酶预处理玉米芯,得到不同木糖含量的水解液,并利用热带假丝酵母进行发酵.结果表明,酸法获得水解液中的木糖浓度较高,酸法水解组中木糖醇产量和转化率均略高于酶法水解组,两者间差异不显著.     

Plant matter decomposition in the upper timberline ecotone of the Polar Urals

A relatively high biological activity of soils has been revealed at the upper timberline in the Polar Urals. The role of the altitudinal gradient as a factor of destruction process has distinctly manifested itself upon comparing decomposition rates of flowering plant foliage and herbaceous plant roots in the forest and in the tundra. The qualitative composition of decomposing plant matter has also proved to play a significant role. The soil moisture regime of the ecotope is the leading factor of the destruction process.     

冻干壳聚糖微球固定化纤维素酶的研究

分别以冻干壳聚糖微球和湿壳聚糖微球为载体,戊二醛为交联剂进行纤维素酶的固定化研究,并对2种固定化酶的热稳定性、米氏常数、重复利用次数、pH值加以对比分析。确定酶固定化的适宜条件为：0．03g冻干壳聚糖微球与10mL4g/L戊二醛交联4h后,加入10mg酶固定2h,酶活力回收率为96．3％;0．1g湿壳聚糖微球与10mL 2g／L戊二醛交联2h后,加入6mg酶固定4h,酶活力回收率为62．4％。与游离酶相比,2种固定化酶的米氏常数均降低;具有很好的热稳定性;最适酶解温度分别为60℃,50℃;酶解反应适宜pH范围3．0—4．0,最适pH值均向酸性方向移动。冻干载体更易与酶分子结合,酶活力回收率高于湿载体固定化酶。     

SLP250二段式垃圾焚烧炉的燃烧调整

由于垃圾的热值和干、湿度等变化较大,所以,垃圾焚烧炉的燃烧调整具有一定的难度。简要论述了如何调整和控制垃圾焚烧炉的稳定燃烧,以供相关人员参考。     

城市屋面雨水绿地水平流渗透净化研究

把城区屋面汇集的雨水径流通过绿地或人工土层净化后收集利用或渗透地下,既可涵养地下水,又截留处置了部分雨水,减轻了雨洪负荷和雨水径流对受纳水体的污染,是一种经济有效的雨水利用方案。但为保证雨水渗入地下后不污染土层和地下水源,本文研究了屋面雨水在天然和人工配制的两种土壤中水平流动的净化作用及其规律。为屋面雨水绿地渗透方案的工程实施提供技术依据。     

The influence of dilute sulfuric acid pretreatment on biogas production from wheat plant

Dilute sulfuric acid pretreatment was used to improve the biomethane production from wheat plant (WP) via mesophilic anaerobic digestion. The pretreatments were performed at 121°C for different time durations of 10, 30, 60, and 120 min. The maximum methane yield of 302.4 mL/g volatile solids (VS) was obtained after the pretreatment for 120 min, which was 15.5% higher than that of the untreated WP. The highest amounts of lignin removal (15.2%) and xylan degradation (91.5%) were also achieved after this pretreatment. The pretreatment for 60 min enhanced the methane yield by 8.9%, while the pretreatments for 10 and 30 min had no positive effects on the methane yield. All of the pretreatments significantly removed the hemicelluloses. Moreover, the qualitative analysis of the untreated and pretreated WP structure showed significant reduction in the crystallinity index accompanied by the destruction of surface layers of WP structure after pretreatment.     

偶氮二甲酰胺发泡剂清洁生产评价模型

提出了针对不同工艺的偶氮二甲酰胺（ADC）发泡剂生产企业的清洁生产综合评价方案。利用逐层序关系分析法确定各指标的影响因子,采用极差标准化法对正逆向指标数据进行初步处理,使用主成分分析法对ADC发泡剂生产企业进行排名。该研究为ADC发泡剂清洁生产评价提供了一个更加客观和精确的方案。