共查询到20条相似文献，搜索用时 31 毫秒
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DUAN Shao guang 《保鲜与加工》2002,(1):109-112
Professor Venzo de Sabbata,working at World Laboratory,Lausanne,Switzerland,and Department of Physics,University of Bologna and Ferrara,Italy,is a famous Italy Physicist in the world.He is engaged with a series of creating research works about gravity quantization of General Relativity Theory in the real space-time which attract the attentions of the world.This paper pays the attention to introduce the works of this field,containing mainly:1.quantizing the general relativity theory in the sense of Einstem-Cartan theory,i.e., general relativity adds the torsion,which means introducing spin into the theory of gravity.2. building a compact mathematical tool for research of gravity quantization,the geometric algebra in the real space-time--multivector algebra,i.e.,developing a spinor manifold in the real space-time. 相似文献
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DUAN Shao-guang 《保鲜与加工》2004,(11):66-70
The contact number is an important mathematical tool of systems theory and methods in the monograph Set Pair Analysis and Its Preliminary Applications written by Zhao Keqin for unitizedly processing the uncertainties due to the fuzzy, stochastic, intermediate and information uncomplete about something. The article applies the multivector algebra which is isomorphism with the real Dirac algebra in the real space-time adopted by Venzo de Sabbata to the contact number of set pair analysis, and consequently, the contact number is generalized correspondingly. 相似文献
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The static absolute position principle of Global Position System(GPS) is analyzed.The more strict equations of the GPS static absolute position are obtained,by considering the effect of the transmission of signal in earth's gravitation,on the condition that the earth's gravitation is static and spherically symmetric.The satellites' mass can be ignored and the satellites move in circular orbits.The effects of the other celestial bodies on the space-time can be neglected.And then the values of the correction quantities is estimated.The correction quantities are very small,about at the orders of magnitude from mm to cm.Moreover,the current GPS's corrections to the satellite clocks are not correspondent theoretically with the theory of measurement of general relativity. 相似文献
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This paper discusses the Reissner's plates on elastic foundation.The elastic foundation is considered as two- paramerer and its effect to thick plates are taken into account by a set of govering differential equations. According to the foundamental solutions for bending problem on two- parameter foundation derived, three boundary integral equations denoted by generalized displacement functions are established. This method is suitable to solve the bending problem of thin or thick plates on two- parameter foundation with arbitary boundary condition, arbitary shape and arbitary load conditions 相似文献
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DENG Zhao-jing 《保鲜与加工》2004,(10):60-63
Based on thermodynamics of positive and nega tiveenergy spectrum systems the complemental correspondence relations of the stabilizing criterion between the pcsitive and negative energy spectrum systems have been established. And then according as the Landau's theory, the theory for the exsitent condition of negative energy spectrum, and combing with the exact gravitational formula revised by general relativity has demonstrated that the high-density self-gravitationa l matter are the negative energy spectrum systems. Finally, on the basis of these complemental correspondence relations combing with the specific free energy of bigh-density self-gravitational systems, the stability of the negative energy spectrum systems have been analysed. 相似文献
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Luo Min Ren Zhen 《保鲜与加工》1988,(5)
Steady-state probability, frequency and duration are the three main indices in reliability evaluation of the HVDC systems. Generally, they are solved by numerical methods. Their topolgical formulaes are derived by using the basic theory of ccates graph and considering conditions for some particularity of state-space in this paper. A set of generalised formulaes can be applied to obtain these indices expression about reliability parameters of components. Finally,an example is given to illustrate and verify this method. 相似文献
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A large literature within industrial geography suggests that contemporary production systems are characterized by vertical disintegration processes and the emergence of agglomerations of small manufacturing establishments. According to Allen Scott, one of the most influential contributors to this literature, centers of economic activity in California are especially susceptible to the processes of vertical disintegration and agglomeration. Our concern in this paper is that this “California thesis” has serious empirical difficulties that need to be addressed. Accordingly, this paper reexamines general indicators of vertical disintegration, comparing their temporal record in California to that of the nation as a whole. We examine changes to these indicators for a set of industries that, according to Scott, are characterized by vertical disintegration. Our findings indicate that the weight of evidence does not support the conclusions of Scott concerning vertical disintegration in California. Therefore, his explanation of recent economic growth in California and the utility of his theory as an economic development paradigm require reevaluation. 相似文献
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Considering influence of factors such as seat and passengers, a MDOF(Multi Degree of Freedom)model for active suspension is employed. Based on the derived 8DOF model, a controller for this model is also designed by using LQ control theory. Furthermore the appropriate control scheme is selected by testing various performance indexes. The study shows that the satisfied results can be obtained using an appropriate vehicle model, even if the low order controller and the general control strategy are adopted. 相似文献
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黑茶作为中国六大茶类中的一种,近年来因其独特的保健作用及便于储藏、耐冲泡的特点而备受欢迎,其渥堆过程中微生物、渥堆工艺及保健作用等也被广泛研究。它是一种后发酵茶,经渥堆其生化成分发生一系列的化学反应,形成不同于其他茶类的独特风味。渥堆是黑茶加工中最关键的工序,其实质是以微生物活动为中心,在湿热、微生物以及胞外酶的相互作用下使多酚类物质自动氧化。综述黑茶某些品质成分,初加工中渥堆工艺、渥堆微生物及生化成分变化情况,初加工配套工艺技术以及深加工相关研究,概括黑茶目前的主要研究情况并展望今后黑茶的深入研究方向,即开展微生物、酶、品质成分三者间内在关联的研究,揭示黑茶特征风味形成机理,以及加工机械化、规模化、清洁化等研究,以期为黑茶的进一步研究提供基础和借鉴。 相似文献
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Jianmin Qi Hui Chen Aifen Tao Jiantang Xu Lihui Lin Pingping Fan 《Plant Breeding》2014,133(6):777-781
White jute (Corchorus capsularis) and dark jute (Corchorus olitorius) are two important cultivated crops that are used for natural fibre production. Some genetic maps have been developed for dark jute, but the genetic map information for white jute (C. capsularis) is limited. In this study, a linkage map comprising 44 sequence‐related amplified polymorphisms (SRAPs), 57 intersimple sequence repeats (ISSRs) and 18 randomly amplified polymorphic DNA (RAPD) covering 2185.7 cM with a mean density of 18.7 cM per locus was constructed in an F2 population consisting of 185 individuals derived from a cross between two diverse genotypes of ‘Xinxuan No. 1’ and ‘Qiongyueqing’ in white jute. These markers were evenly distributed in the linkage groups without any clustering. This genetic linkage map construction will facilitate the mapping of agronomic traits and marker‐assisted selection breeding in white jute. 相似文献
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LARGE DEFLECTION OF A CIRCULAR PLATE ON PASTERNAK FOUNDATION UNDER A CONCENTRATED LOAD AT THE CENTER
Liu Dong Liu Longquan 《保鲜与加工》1992,(4)
Based on Karman's nonlinear foundamental differential equations, the new method combines perturbation method with integral equation method is forward to solve nonlinear bending of a clamped circular plate on Pasternak foundation under a concentrated load at the center. This method is simple and easy to use. The numerical results show that the present solution is reliable. 相似文献
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A new measurement method for mass property parameters 总被引：1，自引：0，他引：1
Mass property parameters (mass, center of mass, moment of inertia) are important technology parameters of aircraft. The traditional mass and center of mass measurement uses centroid units, and the moment of inertia measurement torsion units, which can only get results in installing direction. Because of the structural reasons, there is a need to get all high accurate physical parameters in clamping once. To solve this problem, this study merges centroid units and torsion units into one composite unit, installs a table which can tilt and rotation to measure the moment of inertia in different conditions. The moment of inertia and product of inertia relative to three axis are calculated by the method of coordinate transformation. Measurement theory of mass, center of mass and mass moment of inertia are described, the main reason of causing measurement errors is discussed, and the measurement accuracy affected by tilt error is analyzed. 相似文献
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Based on the general thermodynamic theory,a mathematical model for thermodynamic parameters of hot-shot steam is derived,it includes the formula of specific enthalpy,specific volume,specific heat at constant pressure and specific entropy.The specific enthalpy formula of steam with a pressure range from 0 MPa to 90 MPa and the specific volume formula of steam with a pressure range from 0 MPa to 40 MPa within permission error of the International Steam Skeleton Tables in 1985,and that all the model with a temperature range from 273.15 K to 1 073.15 K.The model is applied to real-time simulation for supercritical fossil power unit and convenience in application of engineering. 相似文献
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Microstructures, Reaction Kinetics and Properties of Reaction Between Magnesium and Silica Glass 
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下载免费PDF全文 In earlier calculation models,the stiffness centers in frame-shear wall structures have been located by the structural torsion stiffness.However,the results are illogical owing to the difference between the distortion character and the shears distribute mechanism of the frames and shear walls.In this paper,a new formula for calculating story stiffness is introduced,which can consider the stiffness of the frames and shear walls at the same time.The structural stiffness centers,the torsion eccentric distances and torsion effect are calculated,and the stiffness of elements is considered also.It is shown that the concept of the presented stiffness model is clear and the results are reasonable,which can be used to calculate the appreciative torsion effect. 相似文献
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Li Zhengliang 《保鲜与加工》1995,(1)
In this paper,the boundary element methods are applied to analyse the plates ontwo-parameter elastic foundation according to two boundary integral equations.The bending mo-ment,torsion and shear force at any point of plates are discussed by means of the theory of elasticitymechanics.An example and a plate in practital engineering are analysed.The resulta show that thereare high efficiency,good accuracy and little storage with this method. 相似文献
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对砂土地基上圆形浅基础在竖向荷载V、水平荷载H及力矩M复合加载条件下的承载力进行了系统的三维有限元分析。在分析中,砂土假定为纯摩擦材料,遵循基于Mohr-Coulomb破坏准则的理想弹塑性本构关系。首先,对圆形浅基础的竖向承载力进行了有限元计算, 并与滑移线解法进行了对比,两种方法所得结果比较吻合。进而探讨了砂土内摩擦角对于基础在V-H、V-M荷载平面与V-H-M三维荷载空间内的破坏包络轨迹的影响。计算结果表明,与不排水情况下软黏土地基上基础破坏包络面相比,砂土地基上圆形浅基础的破坏包络面形状有较大差异, 但V-H和V-M平面内的破坏包络面形状仍具有较好的归一化特性。基于有限元计算结果,建立了圆形浅基础在V-H-M三维荷载空间内的破坏包络面方程, 该方程可用来合理评价复合加载条件下砂土地基上圆形浅基础的整体稳定性。 相似文献
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甘薯辐射和组培相结合筛选突变体 总被引：5，自引：0，他引：5
本研究采用副照甘薯强奸民意苗，接种单节段，离体培养并筛选变异体。以三种不同基因型作副射材料。初步明确了辐射和组培结合过程中一些基本技术条件，如培养基、基因型、光照条件、组培条件下的辐照剂量等，初步获得薯皮色变异系，对线虫性糠腐病抗扩展的变异系。它比常规辐射育种可节省大量田间工作量，并能缩短育种击期， 相似文献