焦化厂再生酸的净化初探

介绍了焦化厂净化再生酸的水解方法 ,可除去再生酸中的部分水、油及沥青质 ,以达到净化的目的 ,并对再生酸的密度、酸度、磺化物、COD等指标进行标定。     

公伯峡水电站导流隧洞支护施工技术

介绍了网喷混凝土、超前锚杆、锚筋桩、钢支撑、钢纤维混凝土、现浇混凝土提前衬砌、管棚法施工等多种支护措施在公伯峡导流洞工程中的应用。     

不同岩石室内破碎及性能试验对比分析

为了论证乌弄龙水电站燕子崖料场灰岩、砂板岩夹层及右岸地下厂房洞挖砂岩、板岩作为混凝土骨料的可行性,对这4种骨料进行了室内破碎及性能对比试验研究。结果表明:灰岩骨料各项性能满足混凝土施工规范的要求,作为混凝土骨料宜优先选用;砂岩骨料压碎指标、坚固性和针片状颗粒含量均较低,但其为具有潜在碱-硅酸反应的活性骨料,掺入20%以上粉煤灰可有效抑制其碱活性;板岩和砂板岩质量较差。     

干旱地区施工弃渣生态修复工程探究

在西部干旱地区工程项目建设过程中,大规模的开挖、修路等施工会产生大量的弃渣,不仅加剧水土流失,而且造成一系列的生态问题。通过对弃渣状况进行研究,阐述生态修复的工程措施,为干旱地区工程建设项目的弃渣治理提供一定的借鉴意义。     

柔性防护结构在长港河道整治工程中的应用

通过鄂州长港河道整治工程的实际工程应用,提出了可普遍应用于河道流域治理的柔性防护结构解决方案,通过与传统刚性防护结构进行比选,归纳总结柔性防护结构在安全、经济、施工、生态方面的突出特点,为类似工程提供了一种可借鉴的解决办法。     

阳离子乳化沥青混凝土配合比设计的优选方法研究

采用均匀正交试验对水泥掺量、乳液用量、拌合用水量三个因素进行优选,得到阳离子乳化沥青混凝土的基础配合比参数。通过测定每组沥青混凝土试件的稳定度和流值,并采用投影寻踪回归分析法(PPR)研究了水泥掺量、乳液用量和拌合用水量对稳定度和流值的影响规律,研究发现,对于稳定度和流值影响最大的因素是水泥掺量,其次是乳液用量的影响,而拌合用水量对稳定度和流值影响较小。     

电影《白鹿原》的方言俗语与人物性格

方言俗语的运用与人物性格的塑造有着密切的关系.为了达到说明影片《白鹿原》中的方言俗语与人物性格塑造之间的关系的目的,通过具体分析电影《白鹿原》中几个主要人物白嘉轩、鹿三、鹿子霖、田福贤等人的方言俗语,来探讨方言的运用对人物性格塑造的作用.方言俗语的使用,使影片人物形象的塑造更加立体生动,有了活生生的真实感.     

浊点萃取分光光度法测头发中锌的含量

针对传统萃取分光光度法测定头发中的锌含量,需要使用苯、四氯化碳等有机毒性试剂萃取锌-双硫腙疏水配合物,存在污染环境和操作费时之弊端,采用浊点萃取法代替有机毒性试剂萃取锌-双硫腙红色疏水配合物,用分光光度法测定人发中的锌含量.选择湿法消化处理头发试样,选取非离子表面活性剂曲拉通X-114和硫酸铵作为浊点萃取体系,对锌-双硫腙红色疏水配合物进行浊点萃取;实验测定了浊点萃取物的最大吸收波长、萃取剂的浓度、萃取剂的测定、硫酸铵的用量及显色体系的pH和显色剂的用量对吸光度的影响,并进行回收率实验.实验结果表明浊点萃取的配合物最大吸收波长为527 nm、质量分数2％的萃取剂为0.3～1.0 mL、硫酸铵1.2g、pH为4.5、显色剂的用量为0.2～0.8 mL,锌含量的线性范围为0.2～1.2 μg/mL,线性回归方程为A=0.435 9 c（μg/mL） ＋0.014 8,相关系数r=0.997 3,表观摩尔吸光系数为5.894×10 000 L/（mol·cm）,测定结果的相对偏差为2.4％,回收率为98.76％～102.2％.用该法测定头发中的微量锌,结果令人满意,对食品中微量锌的测定具有一定应用价值.     

Polycrystalline diamond MESFETs by Au-mask technology for RF applications

Metal-semiconductor field effect transistors (MESFETs) were fabricated on H-terminated polycrystalline diamond.The DC characteristics of the p-channel MESFET showed a maximum drain current density of 204 mA/mm at a gate-source voltage of 6 V,and a maximum transconductance of 20 mS/mm at a gate-source voltage of 1.5 V.The small signal S-parameters of MESFET with 2 100 m gate width and 2 m gate length were measured.An extrinsic cut-off frequency (fT) of 1.7 GHz and the maximum oscillation frequency (fmax) of 2.5 GHz were obtained,which was the first report on diamond MESFETs with RF characteristics in China.     

Identification of the nonlinear properties of rubber-bearings in base-isolated buildings with limited seismic response data

Seismic behaviors of base-isolated structures are highly affected by the nonlinear characteristics of the isolated systems.Most of the currently available methods for the identification of nonlinear properties of isolator require either the measurements of all structural responses or the assumptions of the proper mathematic models for the rubber-bearings.In this paper,two algorithms are proposed to identify the nonlinear properties of rubber-bearings in base-isolated buildings using only partial measurements of structural dynamic responses.The first algorithm is applicable to the case that proper mathematical models are available for the base isolators.It is based on the extended Kalman filter for the parametric identification of nonlinear models of rubber-bearing isolators and buildings.For the general case where it is difficult to establish a proper mathematical model to describe the nonlinear behavior of a rubber-bearing isolator,another algorithm is proposed to identify the model-free nonlinear property of rubber-bearing isolated system.Nonlinear effect of rubber-bearing is treated as ’fictitious loading’ on the linear building under severe earthquake.The algorithm is based on the sequential Kalman estimator for the structural responses and the least-squares estimation of the ’fictitious loading’ to identify the nonlinear force of rubber-bearing isolator.Simulation results demonstrate that the proposed two algorithms are capable of identifying the nonlinear properties of rubber-bearing isolated systems with good accuracy.