反复试验

In the test research of the most radical plane column-beam joint specimens are done, so the feasibility and the problem for this construction method could be discussed.

基于此，本文有针对性的对轴压比、剪压比及梁柱混凝土强度级差进行控制，设计并完成了7个按梁混凝土强度浇筑的钢筋混凝土平面框架节点的低周反复加载试验，通过量测各试件节点区水平箍筋以及贯穿节点的梁、柱纵筋在不同受力阶段的应变等，综合分析了各个试件的延性、耗能性及梁柱纵筋的粘结退化状况，考察了节点核心区采用梁混凝土浇筑后对试件综合抗震性能的影响。

Cloisonne Perkin colored sand painting is said by the Beijing artist Zhang Xian folk-old man, from the ancient Chinese "cloisonne" art to draw its essence, after years of research and repeated tests, created by the craft.

景泰蓝珀金彩沙画据传是由北京民间老艺人张玉先老先生，从中国古老的"景泰蓝"艺术中汲取其精华，经过多年的研究和反复的试验，创造出的工艺品。

The program was written in C, the parameters were set according to the stability and transient response requirement and the experimental results showed that parameters were chosen satisfyingly.

软件用单片机C语言进行编写，各控制环节的取值都考虑到系统稳定性和动态响应的要求，经过反复调试和试验，各控制环节的取值都能满足设计要求。

First of all, the paper carried out test study on four two-spanned model members of FSMRCWB, including three 1/2-scaled two-storeyed models and one 1/3-scaled three-storeyed model. The paper analyzed the test results, including analysis on mechanical property of the composite wall beam under vertical loads, and failure mode, deformation capacity, aseismic performance under horizontal loads and constant vertical loads. Secondly, the nonlinear property of concrete is studed and the nonlinear models of FSMRCSS is builded by ANSYS. Last, The paper studies the result of ANSYS, which mainly includes the loading-displace curve of FSMRCSS under horizontal loads and constant vertical loads, the mechanics of arch under vertical loads lonely and under horizontal loads and constant vertical loads respectively, and status of the distribution and changing of vertical stress and cross shear on the surface of the suporting beam, and the influence of span ratio and hole.All in all, the caculating results are in good agreement with the test results.

本文首先进行了三个1/2比例的两跨两层和一个1/3比例的两跨三层的框支密肋复合墙梁的模型试验，分析了框支密肋复合墙梁在竖向荷载作用下的受力性能，以及在竖向荷载与水平低周反复荷载共同作用下的受力性能、变形性能、滞回性能、耗能系数及破坏形态；其次，研究了混凝土的非线性特性，建立了框支密肋复合墙梁非线性有限元模型，并借助大型通用有限元软件ANSYS进行计算；再则，进行了非线性有限元结果分析，主要研究框支密肋复合墙梁在竖向荷载与水平地震力共同作用下的荷载位移曲线，分析在竖向荷载单独作用下和在竖向荷载与水平地震力共同作用下墙梁的拱作用，托梁顶面的竖向应力和横向剪应力分布及变化情况，并讨论跨度比、洞口对墙梁拱作用和托梁顶面的竖向应力的影响。

Then, they were strengthened with RC jacketing and bonding steel plates respectively.

在第一阶段试验中，未加固的试件在低周反复荷载作用下使梁纵筋屈服。

The paper based on experiment of two Subassemblage and Prestressed concrete frames under low reversed cyclic loading, crack distribution, failure pattern, hysteresis curve, skeleton curve, displacement ductility, energy dissipation and rigidity degeneration are studied systematically.

本文通过对两榀预压装配式预应力混凝土框架在低周反复荷载作用下的试验，深入研究了预压装配式预应力混凝土框架的裂缝分布、破坏形态、滞回曲线、骨架曲线、位移延性、耗能能力、刚度退化等抗震性能。

In this paper,the superelastic deformation behavior of the NiTi shape memory alloy wires subjected to cyclic loading under variable amplitudes is investigated experimentally.

通过拉伸试验，研究了超弹性形状记忆合金丝在不同应变幅值反复加卸载条件下的滞回变形行为。

The authors carried many researches of the feasibility about enriching and separating trace zinc from almost cadmium, and the rate of recoveries of several common metal ions according to this methodo Through repeatedly probed and tried out, at last, a thought as collaborated with traditional methods was established - using diantipyrinylmethane as complex reagent ,with ammonium thiocyanate and zinc forming the triple ionic compound in the medium of hydrochloric acid , extracted by trichloromethane, extracted the organic system by ammonium hydroxide in order to gain zinc .

本文主要研究了从镉基体中富集分离微量锌的可行性，以及采用该方法几种常见金属离子的回收率。通过反复的摸索、试验，最终确立了与传统方法相结合的思路—采用二安替比林甲烷作为络合剂和硫氰酸铵、锌在盐酸介质中形成三元离子缔合物，用三氯甲烷作为萃取剂，最后用氨水作为反萃剂将有机相中的锌洗脱出来与镉分离。

The reaction systems and cycling parameters of RAPD for Trichosanthes kirilowii Maxim were confirmed after the reduplicate experiments of genomic DNA abstraction and RAPD analysis. A total of 80 10-mer primers was tested.

通过叶片总DNA抽提、RAPD标记分析及反复的试验筛选，找到了一个适用于栝楼的RAPD反应体系和循环参数。

Bonded and unbonded prestressed concrete frames are tested and analysed up to failure.

本文进行了有粘结和无粘结预应力混凝土框架的反复荷载试验。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。