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Recent study on the subject is an indirect approach: in order to compute the Gabor coefficients, one needs to find an auxiliary biorthogonal window function γ.


The present study reports QSAR study on adenosine kinase inhibitors pyrrolo[2, 3d] pyrimidine nucleoside analogous.


QSAR study on some arylsulfonamides as antiHIV agents


QSAR study on aminophenylbenzamides and acrylamides as histone deacetylase inhibitors: An insight into the structural basis of a


A study on the genotoxic activities of some new benzoxazoles

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 Based on the experimental study on the process of working stages to failure of reinforced concrete frame structures infilled with brick walls under monotonic and reversed cyclic horizontal loads and analyses of their properties on deformations and destructions, formulae for calculating the ultimate strength and stiffness at three different working stages are given in this paper. The results obtained from computation and tests show reasonable agreement in comparison. Furthermore, the restoring force characteristic... Based on the experimental study on the process of working stages to failure of reinforced concrete frame structures infilled with brick walls under monotonic and reversed cyclic horizontal loads and analyses of their properties on deformations and destructions, formulae for calculating the ultimate strength and stiffness at three different working stages are given in this paper. The results obtained from computation and tests show reasonable agreement in comparison. Furthermore, the restoring force characteristic model and elastoplastic characteristic parameters of the structural members of this kind of structure are also given in the paper.  本文通过对砖墙填充框架单元在单向及反复水平荷载作用下受力过程和破坏的试验研究,分析了变形和破坏特点,提出了这类结构的极限强度和从弹性到破坏三个不同阶段的刚度计算公式。计算结果与试验实测值比较接近。文中还给出了这类构件的恢复力模型及其弹塑性特征参数。  Rock fracture by rolling disccutter is a compound fracture process combined with the impacting compression and the shear crushing. The fracture effects may be characterized by two parameters as the depth of penetration h and the fracture angle of rock φ The value of h depends on the loadup condition and the hardness of rock. On certain loadup condition, the crushing strength of rock may be shown in term of A,however, it is considered as unsufficient. The value of h would be propably high in plastic rock ,... Rock fracture by rolling disccutter is a compound fracture process combined with the impacting compression and the shear crushing. The fracture effects may be characterized by two parameters as the depth of penetration h and the fracture angle of rock φ The value of h depends on the loadup condition and the hardness of rock. On certain loadup condition, the crushing strength of rock may be shown in term of A,however, it is considered as unsufficient. The value of h would be propably high in plastic rock , while amount of fracture are not quite as much. As to the angle φ, a more simple quantity, is unrelated to both the loadup condition and the shape of bit but looks like related to rock characters and condition of free surface of rocks. It may also be a characterizing index of crushing strength of rock.As a review of studies on rock fracture by rolling disccutter, this paper deals with the theoretical analysis about fracture process. Taking the angle φ into account as a fundamental parameter and in view of the counterbalance of forces and the law of energy conservation,the models of parabolic area and volume fractured has been set up on the basis of experiments. Also, a functional relation between loads and other parameters has been formulated as follows:wherePvertical force (kg);Kdcoefficient of conversion;[σe]uniaxial compressive strength of rock (kg/cm2);φrock fracture angle (deg);γradius of wear ci cle (mm);θa half of the angle between cutting edges (deg);Rcutter radias (cm);hdepth of cutter penetration (cm);αdspecific energy of rolling fracture (kg·m/cm3).Those formulae above indicate that the vertical force is a function of both the rock fracture parameters (as [σc] etc) and the geometrical parameters of disccutter as R, θ and r.  滚压破岩为冲击压碎和剪切碾碎的复合过程。表征其破碎效果的参量是侵入深度h和岩石自然破碎角φ。h取决于外载荷和岩石坚固性,在一定的载荷条件下,h虽能表示破坏岩石的难易程度,但不充分,因为塑性岩石h可能很大,但破碎下来的岩体并不多。φ则是较单纯的量,它与载荷和压头的几何形状无关,而与岩石性质和自由面条件(数目和形状)有关,可用它表征岩石的可破坏性。本文在讨论滚压破岩中,以φ为基本参量,以试验数据为基础,建立了抛物线破碎面积和体积模型,从力平衡和能量守恒定律出发,分析了滚压破岩各参量之间的关系,确定载荷与各参量之间的函数形式。  Careful observations and analyses were made in connection with the rebound of the excavated pit and the settlement of the box foundation of a 911storeyed RCframed hospital building to be erected on typical prehistoric quarternary pluvial/fluvial soil deposits within the urban district ofBeijing. It was found that the amount of rebound due to the release of overburdenpressure of 1.08kg/cm~2 was 1.24cm, which amounted to more than 50% of the total settlement corresponding to the finished loading of 1.8kg/cm~2.... Careful observations and analyses were made in connection with the rebound of the excavated pit and the settlement of the box foundation of a 911storeyed RCframed hospital building to be erected on typical prehistoric quarternary pluvial/fluvial soil deposits within the urban district ofBeijing. It was found that the amount of rebound due to the release of overburdenpressure of 1.08kg/cm~2 was 1.24cm, which amounted to more than 50% of the total settlement corresponding to the finished loading of 1.8kg/cm~2. It seemedtherefore not appropriate to use the net pressure, which was 0.7kg/cm~2 in thiscase, in calculating the settlement of deeply embedded large foundations inlike soils. Although the general shape of the overall/laveraged loadsettlement curvewas roughly a straight line, a further study on the stressstrain relationships of the soil layers at three different points beneath the foundation showeda definite trend of nonlinearity and inhomogeneity that warranted a specialstudy. A plane sain finite element analysis was made accordingly to achieve atheoretical insight into the problem.The computer program was based on crossbeam structure model and conventional layeredsum settlement analysis method.However, three semiempirical coefficients were introduced in order to takecare of the nonlinear stressstrain relationships of the soils at different partsof the foundation.The calculated settlements thus obtained were very close tothose observed.  本文通过对北京市中医医院病房楼工程基坑回弹和地基沉降的实测,提出一种适用于北京一般第四纪土、考虑地基不均匀和非线性压缩模量的经验修正方案,作为大面积深埋基础用分层总和法计算地基变形和协同作用的依据。   << 更多相关文摘 
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