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.     

The aeroelastic effects on the scatter phenomenon of wind-tunnel data

The unsteady Reynolds-averaged Navier-Stokes equations coupled with the k SST turbulence model are solved to obtain the steady and unsteady aerodynamic forces for airfoils and wings.The effects of vibration types and amplitudes on aerodynamic forces of airfoils and wings are studied.The deformation characteristics of a swept wing induced by steady aerodynamic load are presented.It is found that for a vibrating elastic wing at small and medium incidences,its mean aerodynamic loads are almost the same as those obtained from the static one.On the contrary,at high incidences especially around the stall incidence,the vibration may change the mean values.In addition,the larger amplitude is,the larger discrepancy will be.For a swept wing,the steady aerodynamic loads usually lead to the "pitching down" effect on the wing tip which delays the stall compared with a rigid one;But this phenomenon dose not occur on a aeroelastic wing which can induce the separation ahead and trigger the stall.The above conclusions are in good agreement with the scatter characteristics of wind-tunnel data.The reason why the data obtained from wind tunnel and CFD are different is also analyzed.Meanwhile,it can be an explanation for scatter phenomenon of wind-tunnel data,especially for high incidence cases,which remains a puzzle so far.     

百叶型太阳能集热墙集热效率实验研究

提出建立了在现有Trombe墙的空气夹层中悬挂百叶窗帘的百叶型太阳能集热墙,搭建了带有百叶型集热墙的可对比热箱实验平台,对百叶型集热墙的集热效率进行了测试和分析,实验结果显示,在冬季时,百叶型集热墙的瞬时集热效率最高能达41％,平均集热效率在30％左右,该研究表明新型百叶型集热墙能显著的提高室内环境温度,改善室内热环境,降低室内制热负荷.     

燕子崖砂石加工系统技术创新及运行管理

龙开口水电站大规模采用白云岩作为高强度碾压混凝土砂石骨料生产的母岩,属国内首创,因此缺少相关实验数据和实际生产经验,另外,燕子崖砂石系统自身存在高落差等特点,给砂石系统加工工艺带来了困难.通过采用3个竖井、3个平洞连续阶梯式运输直接将600 m超高落差半成品料输送至半成品堆料场,采用长距离空间曲带式输送机输送成品骨料至坝区转料堆的方案,以及调整爆破参数、干法生产改为湿法生产等工艺措施,解决了骨料高落差、长距离运输,半成品含泥量大,骨料级配不平衡等问题,圆满完成了各阶段浇筑所需砂石骨料的供应任务.     

引黄灌区跨地区水权转让补偿 标准的研究

针对黄河流域引黄灌区的跨地区水权转让补偿标准的定量问题,探讨了转让费用构成中的农业风险补偿、生态补偿、水管单位补偿的含义和计算方法,并以内蒙古自治区鄂尔多斯市引黄灌区的水权转让一期项目为实例,通过计算得出3项补偿费用为889.92万元/年,在25年水权转让期内应付出的补偿费用为22 248万元,水的转让价格平均增加补偿费用为3.45元/m3。对黄河流域水权转让费用构成中的补偿费用进行准确的定量计算,将会进一步推动水权转让更加科学合理的实施,并为引黄灌区的健康持续发展奠定基础。