京尼平对丝素蛋白交联的染色作用

京尼平是一种环烯醚萜类化合物,能够与氨基酸反应生成蓝色素.制备的无色丝素蛋白溶液与京尼平溶液混合后,溶液显蓝紫色.利用紫外可见光光谱和荧光光谱,分析了整个反应过程,考察了温度、酸碱度等影响因素,并对颜色产物对光照的稳定性进行了分析,初步探讨了京尼平对丝素蛋白交联染色作用的机制.结果显示:生成的颜色产物在590 nm处具有特征光吸收,高温和碱性条件有利于反应的进行;交联产物的颜色与反应时pH相关,酸性条件下偏蓝色,碱性条件下偏紫色;生成的颜色产物具有较高的稳定性,于自然光强下放置一个月或5 000 lx光强照射6 h.590 nm吸收值减小不显著.丝素蛋白的内源荧光显著降低,表明反应导致丝素蛋白构象的剧烈变化.京尼平可能与丝素蛋白中某些氨基酸侧链基团反应形成稳定的颜色产物.研究结果对环烯醚萜类化合物用于蚕丝染色具有一定的指导意义.图5表1参18     

煤矿领导者和监管者的行为决策演化博弈分析

为完善煤矿企业内部安全监管体系,协调安全投入和监管的行为决策,对企业领导决策者和监督管理者的行为决策进行演化博弈分析.构建领导决策者和监督管理者的双群体演化博弈模型;根据博弈模型建立复制动态方程,通过雅可比矩阵对其进行局部稳定性分析并讨论系统的演化稳定策略(ESS);应用数值模拟分析验证博弈模型和结论.结果表明:安全投...     

The dynamic response of pressure relief valves in vapor or gas service. Part II: Experimental investigation

An experimental testing program designed to evaluate the opening stability characteristics of direct acting pressure relief valves (PRV) in gas/vapor service is described. Three different valve sizes from each of three different manufacturers were tested at two different set pressures to determine their opening characteristics (disk lift vs. time). The valves were tested with several different lengths of inlet piping as well as with and without discharge piping to determine the conditions under which unstable operation (chatter) would occur. Part I of this program described a mathematical model for predicting the dynamic response of PRV's, and the data described in this test program were used to evaluate the accuracy of the model, as described in Part III of this study to follow.     

基于支持向量机的采空区稳定性分级

针对采空区稳定性分级的影响因素众多且关系复杂的特点,提出采用支持向量机理论对采空区稳定性进行分级。根据分级评价指标选取原则,选取岩体结构、地质构造、岩石的质量指标、地下可见水、地下水体、周边开采的影响、相邻空区的情况、工程布置、跨度、面积、高度、矿柱的尺寸及布置、埋藏深度和采空区的规格14个影响因子,建立了采空区稳定性评价指标体系,引入支持向量机理论,选择有向无环图方式构造多类分类器,得到采空区稳定性分级的支持向量机模型。将该模型用于山东黄金矿业西山矿区的25个采空区进行分级,并与未确知测度方法的分级情况     

巢湖东部沉积硅藻组合记录的水环境变化

对巢湖东部湖心31 cm深的沉积岩芯进行放射性核素定年和化石硅藻分析,根据硅藻属种组合的变化反演了近150 a来巢湖东部水环境变化历史. 结果表明,巢湖东部水环境变化经历了2个主要阶段:①1827—2000年以Aulacoseira granulata占优势,但1970年其含量(以数量所占比例计)出现一明显谷值(22.4%),同期附生和底栖类硅藻频繁出现,反映了水动力条件减弱后又增强的趋势;该阶段水生植被较为发育,水体维持中营养状态.②2000年至今,以A. granulata和耐营养属种(A. alpigena、Cyclostephanos dubius)为优势组合,附生和底栖类硅藻含量显著减少,表明生活污水的大量排放导致湖区急剧富营养化; Hill多样性指数在2000年后显著下降,表明在该阶段水生生态系统发生退化.      

The influence of individuals in forming collective household preferences for water quality

Preference for water quality and its nonmarket valuation can be used to inform the development of pricing policies and long term supply strategies. Tap water quality is a household concern. The objective status quo of water provision varies between households and not between individuals within households, while charges are levied on households not individuals. Individual preferences differ from collective preferences. In households where there are two adults, we examine the preferences of each separately and then as a couple in collective decisions. We show the level of influence each has in developing the collective decision process. We use discrete choice experiments to model preference heterogeneity across three experiments on women, men and on both. We propose a random utility model which decomposes the error structure in the utility of alternatives so as to identify the individual influence in collective decisions. This approach to choice data analysis is new to environmental economics.     

某大型地下洞室群围岩稳定性工程地质评价

某水电站布置有大型的地下洞室群,其规模在国内外已建和拟建的工程中都是十分罕见的。总体上说,地下厂房区岩体质量较好,但由于多期的构造作用,在厂房区岩层中发育有不同级别的结构面,对围岩的稳定性有一定影响。对此,本文运用围岩分类法和数值模拟法分析了厂房开挖后围岩的整体稳定性,然后运用UNWEDGE软件对主厂房顶拱部位的不稳定块体进行了分析评价。     

苯系混合气体生物滴滤器非稳态工况性能

用以纤维附着活性炭(ACOF)和不锈钢丝网为载体材料的气体生物滴滤器(BTF)进行了净化TEX(甲苯、乙苯和二甲苯)混合气体的负荷冲击和闲置恢复运行.负荷冲击实验表明,在最大消除能力范围以内,污染负荷加倍后,起始阶段净化效率下降20%左右,但2d后就基本恢复原有效率.闲置恢复实验表明,8～12 h的停运闲置对设备的性能基本无影响;2d闲置停运后,恢复开机时性能下降20%左右,但在4～6h内便能恢复;29d的闲置对设备的性能影响较大,恢复开机时性能下降70%～80%,需10d左右的时间才能基本恢复.结果表明,采用ACOF和不锈钢丝网的BTF具较好的抗负荷变化及缓冲能力.     

Promotional effect of ion-exchanged K on the low-temperature hydrothermal stability of Cu/SAPO-34 and its synergic application with Fe/Beta catalysts

• K⁺ hinder the structural degradation of Cu/SAPO-34 under humid condition<100°C. • K⁺ on Cu/SAPO-34 brings lower acidity and inferior SCR activity at high temperature. • Fe/Beta was used to compensate the low activity of Cu/SAPO-34 at high temperature. • The hybrid catalysts with KCu/SAPO-34 and Fe/Beta show a great potential for using. K ions were introduced onto Cu/SAPO-34 catalysts via the ion-exchange process in order to improve their stability under low-temperature hydrothermal aging. The changes in structure and copper-species contents of these catalysts upon hydrothermal aging were probed in order to investigate their effects on selective catalytic reduction (SCR) activity. For the fresh Cu/SAPO-34 catalysts, K ions had little influence on the chabazite framework but effected their acidities by exchanging with acid sites. After hydrothermal aging, the structural integrity and amount of active sites decreased on pure Cu/SAPO-34. While the K-loaded catalysts showed improved chabazite structure, acidity, and active site conservation with increasing K loading. However, although the 0.7 wt% K catalyst maintained the same crystallinity, active site abundance, and low-temperature SCR activity as the fresh catalyst upon aging, an apparent decrease in SCR activity at high temperature was observed because of the inevitable decrease in the number of Brönsted acid sites. To compensate for the activity disadvantage of K-loaded Cu/SAPO-34 at high temperature, Fe/Beta catalysts were co-employed with K-loaded Cu/SAPO-34, and a wide active temperature window of SCR activity was obtained. Thus, our study reveals that a combined system comprising Fe/Beta and K-loaded Cu/SAPO-34 catalysts shows promise for the elimination of NO_x in real-world applications.     

厌氧环境下美人蕉根表铁膜对重金属积累转运的影响

根表铁膜作为污染物进入植物体内的门户,对植物修复重金属污染底泥起着重要作用.有机物降解消耗DO导致的底泥厌氧环境会显著影响根表铁膜的形成,并改变重金属的生物地球化学特征,从而影响重金属污染底泥的植物修复效果.为了探讨底泥厌氧环境中植物根表铁膜对重金属积累和转运的影响,采用向底泥中投加蔗糖模拟底泥厌氧条件的方法,测定不同底泥厌氧水平下挺水植物美人蕉（Canna indica）的生物量、根表铁膜和植物组织内重金属的含量.结果表明:①底泥厌氧环境不利于美人蕉对Cd、Cr、Cu、Ni、Pb和Zn的吸收,随着厌氧程度的增加,美人蕉对重金属的吸收量逐渐减少.②底泥厌氧环境能促进根表铁膜的形成及其对Cr和Ni的富集,重度厌氧环境中根表铁膜的含量为（10.40±0.30）g/kg（以根干质量计）,但厌氧环境抑制了铁膜对Cd、Pb和Zn的富集.③底泥厌氧环境不利于Ni从根表铁膜转运至植物组织,但轻度厌氧环境能促进Cr和Zn从根表铁膜转运至根系,且底泥厌氧环境对Cd、Pb和Cu的迁移转运无显著影响.研究显示,底泥厌氧环境促进了植物根表铁膜的形成,根表铁膜对重金属积累和转运的影响因底泥厌氧水平和重金属元素种类不同而不同.