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| 1 | “仙芪散”超微粉对麻鸭产蛋后期生产性能及激素水平的影响显示文摘为了探讨'仙芪散'超微粉对麻鸭产蛋后期生产性能及激素水平的影响,试验将600只48周龄麻鸭随机分为5组,每组40只,每组设3个重复,Ⅰ、Ⅱ、Ⅲ组分别添加0.25%、0.15%、0.05%的中药超微粉,Ⅳ组添加0.25%的中药普通粉,各试验组在基础日粮中按比例添加药物,混饲28 d;另设一个空白对照组为Ⅴ组,试验鸭饲喂基础日粮,不添加任何药物。结果表明:添加0.25%、0.15%'仙芪散'超微粉和0.25%中药复方普通粉与空白对照组相比,可显著提高麻鸭产蛋后期的产蛋率(P<0.05),同时显著降低料蛋比及蛋黄胆固醇的含量(P<0.05);Ⅰ、Ⅱ、Ⅲ、Ⅳ组在一定程度上提高了麻鸭血清中雌二醇和孕酮等激素的含量,超微粉适宜添加量为0.15%。说明'仙芪散'超微粉在粉碎后,在低于临床用量的情况下,能提高蛋鸭的产蛋率,降低料蛋比。 | 张丁华 王艳丰 李爱心 王汝都 朱金凤 桂启胜 | 2017 | 黑龙江畜牧兽医(下半月)2017，，6： | 0 |
| 2 | Topology optimization of shear wall structures under seismic loading显示文摘A topology optimization formulation is developed to find the stiffest structure with desirable material distribution subjected to seismic loads. Finite element models of the structures are generated and the optimality criteria method is modified using a simple penalty approach and introducing fictitious strain energy to simultaneously consider both material volume and displacement constraints. Different types of shear walls with/without opening are investigated. Additionally, the effects of shear wall-frame interaction for single and coupled shear walls are studied. Gravity and seismic loads are applied to the shear walls so that the definitions provide a practical approach for locating the critical parts of these structures. The results suggest new viewpoints for architectural and structural engineering for placement of openings. | Pooya Zakian Ali Kaveh | 2020 | Earthquake Engineering and Engineering Vibration2020，19，1： | 0 |
| 3 | Evaluation of a developed bypass viscous damper performance显示文摘In this study,the dynamic behavior of a developed bypass viscous damper is evaluated.Bypass viscous damper has a flexible hose as an external orifice through which the inside fluid transfer from one side to the other side of the inner piston.Accordingly,the viscosity coficient of the damper can be adjusted using geometrical dimensions of the hose.Moreover,the external orifice acts as a thermal compensator and alleviates viscous heating of the damper.According to experimental results,Computational Fluid Dynamic(CFD)model,a numerical formula and the simplified.Maxwell model are found and assessed;therefore,the verification of numerical and computational models are evaluated for simulating.Also,a simplifed procedure is proposed to design structures with bypass viscous dampers.The design procedure is applied to design an 8-story hospital structure with bypass viscous dampers,and it is compared with the same structure,which is designed with concentric braces and without dampers.Nonlinear time history analyses revealed that the hospital with viscous damper experiences less structural inelastic demands and fewer story accelerations which mean fewer demands on nonstructural elements.Moreover,seismic behaviors of nonstructural masonry claddings are also compared in the cases of hospital structure with and without dampers. | Mahrad FAHIMINIA Aydin SHISHEGARAN | 2020 | Frontiers of Structural and Civil Engineering2020，14，3： | 0 |
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