A BRIEF INTRODUCTION OF A CTA AGRONOMICA SINICA

Acta Agronomica Sinica （AAS, ISSN 0496-3490） is a monthly academic journal co-sponsored by Crop Science Society of China and the Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, under the leadership of China Association for Science and Technology and published by Science Press, Chinese Academy of Sciences. AAS was firstly published in 1962. Her predecessors were Chinese Journal of Agricultural Research started in 1950 and Acta Agriculturae Sinica started in 1952. As one of the key scientific journals in China, AAS has been financially supported by China Association for Science and Technology since 1997 and the National Natural Science Foundation of China since 2000.     

高粱新选不育系A2F4A,A1356A配合力分析

用不完全双列杂交方法,对新选不育系Ｆ４Ａ,３５６Ａ及目前生产上常用的３个不育系９个恢复系进行了配合力及遗传效应的分析,株高,穗长,穗茎粗,开花期,穗重,穗粒重,穗粒数和千粒重等８个性状的分析结果表明,所有亲本各性状配合力方差均达到极显著水准,在全部被研究性状的遗传控制中,加性基因效应占主导地位,５个不育系中,Ａ２Ｆ４Ａ在全部８个性状上的一般配合力效应值最高,恢复系８６４３变在株高,穗重,穗粒重和开     

A CALCUTATION FOR THE WORKSPACE OF A HYDRAULIC EXCAVATOR

In this paper,the parametric equation of a hydraulic excavator workwpace areestablished by using the spatial mechanism theory of robot.Characteristic points of the workspaceboundary are searched by the optimization procedure and the calculate formula of area of theworkspace longitudinal section is found.     

A FINITE ELEMENT RESEARCH ON.A LINKAGE OF A COMPOSITE STRUCTURE OF SHELLS AND PLATES

In this paper,the penalty element stiffness matrix of linkage of plates and shells is deduced accrding to the principle of the penalty elementmethod.This stiffness matrix can be also used for a linkage between shells andsolids.It is of some practical value in the finite element calculations of engineeringstructure.     

新型吡唑酰胺类农药吡噻菌胺的研究进展

为阐明新型吡唑酰胺类杀菌剂吡噻菌胺的生态暴露风险与环境行为归趋,本文从合成路径、生物活性、生态毒理、分析方法和环境行为五方面进行分析总结,并对其应用前景进行展望。指出吡噻菌胺对真菌孢子萌发抑制作用显著,防治效果优于治疗效果;吡噻菌胺对水生生物具有较高的生态毒性,且对细胞活力及氧化应激具有显著的对映体选择性差异。建议后续深入开展不同环境下吡噻菌胺的行为特征及其水生生态毒理学研究,特别是对映体选择性的分子机制,探索高效低风险的手性对映体,建立科学精准的风险评估体系,降低其对水生生物安全和人类生殖健康的高潜在暴露风险。     

A STRUCTURAL NON-LINEAR DYNAMIC STABILITY AND A MATRIX FUNCTION METNOD

This paper presents a mathematical and mechanic model for non-linear dynamicstability analysis of structures on the basis of Liapunov's stability criteria. Due to the complexityand difficulty in numerical calculation,a matrix function to this type of stability problems is selectedand the programing formulations are derived.Applying the method to beam or frame structures un-der the axial period loadings,the geometric non-linear dynamic stability results are obtained.Fromthe results,the basic characteristics of this type of probtems,especially the non-linear effect areshown.The model and matrix function method are valtiable both in theory and in practice for struc-tural non-linear dynamic stability.     

抗TMV感染物质——板蓝根

用局部枯斑法测得,板蓝根(Isatis indigctica Fort.)水浸液对烟草花叶病毒(TMV)侵染心叶烟有明显的抑制作用,抑制率在80%以上.温室盆栽试验证明10倍和100倍液能够阻止TMV对甜椒(同丰37)的感染,推迟植株发病,受害程度减轻.     

A CLASS OF SINGULAR CAUCHY PROBLEM FOR A QUASILINEAR HYPERBOLIC EQUATION

This paper studies a class of singular Cauchy problem for aquasilinear hyperbolic equation and shows that there exists a uniquely stablesolution by quasi-differential operators.     

A SELF-TUNING CONTROL FOR A PARALLEL AC/DC POWER SYSTEM

Based on a non-linear system model, an adaptive control methodology is presented for a parallel AC/DC power system by means of on-line recursive parameter identifications. Taking the advantage of rapid power regulatiing ability of the DC power system and combining with the generalized minimum variance self-tuning control principles, the dynamic qualities of the controlled system has been greatly improved. Using SISO form makes the control system very simple to implement. Through the design, simulation and analysis of the self-tuning control system for a practical example, it shows that the self-tuning control strategy is very promising for AC/DC power systems.     

高粱A_1、A_2型核质互作雄性不育性遗传的初步研究

本试验表明,A_1型雄性不育性是由细胞质不育基因S_1与核内两对隐性不育基因ms_1ms_1 ms_2ms_2共同控制.A_2型雄性不育性是由细胞质不育基因S_2与核内一对隐性不育基因ms_2ms_2共同控制.相对的显性恢复基因MS_1MS_1 MS_2MS_2是独立遗传的,不存在累加效应,两对显性基因都与S_1存在互作关系,只要有其中一对就可实现对A_1细胞质不育系的恢复.A_2细胞质雄性不育系则只有MS_2MS_2基因才能恢复.MS_1MS_1基因在A_2细胞质遗传背景下失去了显性恢复作用,成为S_2的非互作基因.雄性不育的核质互作具有普遍性和对应性,保持系则具有多样性.     

A LOCATING DESIGN AND MANAGEMENT OF MODERN ENGINEERING AT A JOB SITE

This paper discusses methods of system design and sys-tem management of modern engineering at a job site on the generalplanning.They include system functions,system objects,system structure,system models,and the evaluational technique of planning system designand system management.     

A Non-linear Circuit Model of A Self Scanned Photodiode Array Image Sensor

A non-linear circuit model of photodiode built according to the working principle of self-scanned photodiode array image sensor is presented for improving the property of the sensor. Through the analysis of the non_linear circuit model,we get the state equations, and the equations are resolved with Runge_Kutta algorithm. The Runge_Kutta algorithm is realized in C language, and the numeric result of the circuit is obtained. The analysis of the numeric result of the model shows that the non_linear performance of the sensor can be improved by reducing the capcitor of the PN junction and the dynamic performance of the image sensor can be enhanced by paralleling capacitor C M , and all the analysis is consistent with the real measurement results of the sensor. The circuit model of photodiode is improved over previous model.     

水稻不育系"龙特浦A"简易穗选提纯技术

通过对水稻不育系“龙特浦A”自交结实规律的分析，提出了简易穗选提纯法，即在不育系“特A”原种繁育圃收割前，穗选性状典型、结实率高的“特A”、“特B”主穗，分别进行单晒单藏，作为原原种，供原种繁育田使用。本方法有效地提高了不育系原原种和原种的纯度，简化了提纯繁育程序，且原种用于制种后所收获的杂种一代种子纯度达到国家标准。     

A CONSTITUTIVE FUNCTION FOR A NONLINEAR ANALYSIS OF STRUCTURES OF LINEAR ELEMENTS

In this paper, a constitutive function in form of integration is presented for a nonlinear analysis of structures of linear elements. With applications of a constitutive function, the truss and frame elements material nonlinear stiffness equations are derived. The results shows the convenience in numerical analysis and the ability to solve some difficult problems in tn the structural behavior study both in loading and unloading process by use of the presented constitutive function.     

A CONSTITUTIVE LAW FOR CYCLIC BEHAVIOR OF A CLASS OF TWO-PHASE STEELS

Based on a thermomechanically consistent mechanical model, the constitutive law for a class of complex two-phase materials with locking-in inter-phase residual stress capability is proposed. The developed model contains the current plastic strain in its hereditary integral so that the main features of the above materials subjected to cyclic loading can be well described. The developed model can include both the endochronic constitutive equation and Bower' s empirical formula as special cases. The cyclic plasticity and ratcheting of OFHC copper (single-phase material) and rail steel BS1l(two-phase material)are analyzed and compared with experimental results     

AN INVESTIGATION ON THE MULTI-ARCH STRUCTURE OF A STRATA AROUND A STOPE

This paper analysis the mechanical process with the photoelast-ic model test ane the finite element method, and presents the basic cause of existing different pressure and different transfiguration in the strata around a stope.     

A GENERALIZED WEBER-FECHNER LAW

This paper presents a generalized Weber-Feehner's Law.It shows that this law can be used in assessing lighting,acoustical andthermal environment of building.The room articulation funetion,the li-ghting clarity funtion and the thermal comfort function are derived fromthis law.The ealeulated results of these funetions are coincident withthe experimental data obtained by some famous researchers in the world.It can be thought to be a universal law.