Effects of Silane Coupling Agent on Road Performances of Composite Asphalt Mixtures

Aiming at the influence of mastics to aggregate adhesion on the performances of asphalt mixtures, three modeling techniques were adopted to prepare composite asphalt mixtures specimens. The influences of silane coupling agent on their road performances were studied and coupling mechanism was analyzed with Infrared Spectroscopy (IR) and Scanning Electron Microscope (SEM). The results indicated that the road performances at 7 day and 28 day curing age increased in the beginning and then decreased with the increase of silane coupling agent dosages. The road performances, such as freeze thaw splitting strength ratio, Marshall stability and compression modulus would be enhanced 10%~30% at 0.6% in asphalt emulsion mass. There was Si O Si chemical bond on interface between mastics and modified granite aggregate by Si O chemical bond of silane coupling agent. Surface of cement asphalt emulsion mastics was rough and its structure was dense. The cement asphalt emulsion mastics can be adhered to granite aggregate surface and mastics to aggregate interface structure is improved with silane coupling agent addition.     

Calculating and Eliminating Coupling Current Using the Partial Capacitance Method

A kind of simple model to analyze the coupling current between phases of Metal Oxide surge Arresters (MOA) is presented,and the coupling current in differet voltage degree using the partial capacitance method is calculated.The result of calculation is accorded with the practically measuring data.So it offeres a convenient and feasible way to minish the coupling current between phases when on line monitoring the MOA.     

作物水氮耦合效应的研究进展

为了解现阶段作物水氮耦合效应研究进展，给之后深入研究水氮耦合效应机制提供理论基础，本文总结了水氮耦合效应对土壤物理性状、营养元素在土壤中的有效性、土壤酶活性、光合性能、生理代谢、植株地上及地下部分生长发育及产质量等方面的影响，并指出了现阶段水氮耦合效应研究存在的不足，包括水氮耦合受生态环境的影响、水氮利用效率差异机制、水氮调控生理及分子机制，以及水氮耦合高效管理模型等方面均有待于进一步深入研究，同时对今后在本领域的研究工作进行了展望，以期为日后加强节水节肥技术的应用提供参考。     

Effective Electromechanical Coupling Property of Multiphase Dielectrics

A new way of defining the effective physical quantities by other apparent physical quantities is proposed. Accordingly, a new framework is induced to construct the effective electromechanical coupling constitutive equation of multiphase dielectric materials .In this framework, a special mode is studied. The effective constitutive equation of transversely isotropic multi-layer multiphase dielectrics is set up, and the expression of effective electromechanical coupling constitutive equation of transversely isotropic multi-layer multiphase in plane-stress is given.     

Numerical Simulations and Design Method of Coupled Wall System with FRC Coupling Beams

Using the software, ABAQUS, accurate simulations of seismic behavior of 2 coupled wall specimens and 2 cantilever structure wall specimens using high performance fiber reinforced concrete (FRC) in plastic hinge under quasi static cyclic loading were carried out. The analysis model proves to be effective with the accordance between results of computation and experiment, then it can be used to analyze the seismic behavior of coupled wall system with FRC coupling beams. By using the verified numerical model, the ability of FRC coupling beams instead of RC coupling beams to provide acceptable performance was discussed. In addition, the impact of coupling ratio on seismic behavior of coupled walls was studied. The results show that coupled walls in which FRC coupling beams are used instead of traditional RC beams have good energy dissipation and ductility, and its initial stiffness is increased and stiffness degradation is slow. And as the coupling ratio of coupled wall structures increases, the stiffness and strength increase. But if the coupling ratio is too large, the ductility and energy dissipation capacity will be significantly reduced.     

干旱条件下水肥耦合作用机理和效应

干旱问题是制约农业发展的主要逆境因素之一。发展节水农业是农业现代化的必然趋势,是解决农业水资源短缺,保证农业可持续发展的根本出路。而水肥耦合研究一直是节水技术研究的一个重要方面。概述了国内外水肥耦合研究的现状,从水肥耦合作用的机理和效应两方面来阐述,包括水分对植物养分转化、吸收及代谢的影响、养分对植物水分利用的影响、生物学效应、生态学效应和对生理指标的影响。并指出今后水肥耦合研究应该加强施肥对农产品品质和生态环境的影响的研究,同时注重构建通用性的水肥耦合模型。     

水肥交互作用对黄土高原南瓜光合特性及其产量的影响

通过不同的灌水和施肥处理,研究水肥交互作用对南瓜光合特性日变化及产量的影响,结果表明：水分与施肥因子对南瓜叶片的光合特性和产量有重要影响,在水分胁迫的情况下,肥水交互作用不显著,在水分较低的情况下,二者表现互为限制条件的协同作用;在水分较高的情况下,肥水交互作用转变成顺序加和作用。其中单因素效应大小表现为：氮>水>磷,耦合效应大小表现为：氮与水耦合>氮与磷耦合>磷与水耦合。在水分适宜时,适宜的施肥量（施氮量50kg／hm2、施磷量35 kg／hm2）可以提高南瓜光合速率和产量,不施肥或施肥量过高都会影响南瓜光合速率和产量。     

Analysis About the Coupling Circuit of the Communication With Low-voltage Power Line

In the interest of realizing carrier communication using LVPL, it is sticking point to analyse and design the coupling circuit of the communication. Higher efficiency of loading carrier signals is necessary. On the other hand, disturbs from LVPL should be overcome. Penman commendably resolved the difficult problem with the "complex-coupling-technology" of combining " electromagnetism - coupling" to "RC-coupling". Based on the " complex - coupling-technology" , "the interface circuit of the communication is analyzed and designed with LVPL. Simulation results and experimentation results show : the coupling circuit not only has higher efficiency of loading carrier signals but also can completely close off 50 Hz signal from LVPL. Therefore, the coupling circuit can apply to communication systems on LVPL.     

基于系统耦合的区域生态安全格局构建——以酒泉市肃州区为例

构建区域生态安全格局对区域的可持续发展有重要的意义,肃州区位于河西走廊中西部,生态环境脆弱,水资源短缺,生态环境建设与保护形势依然严峻,通过构建区域生态安全格局实现可持续发展尤为重要。通过运用定性、定量相结合的方法分析肃州区的景观格局和景观安全格局。最后,运用系统耦合和景观生态学尺度变化的原理和方法,结合肃州区特点,构建肃州区区域生态安全格局。随着尺度的逐渐变大,区域生态安全格局包括生态资源系统耦合、自然—社会系统耦合、农业生态系统耦合、景观安全格局耦合和生态地理区域耦合5个耦合模式。     

麦类作物水肥耦合研究进展

简述了国内外近些年麦类作物水肥耦合研究的结果,总结了水肥耦合的含义、水肥耦合效应对麦类作物生长发育、产量,水肥利用率,光合及生理特性、土壤养分变化及作物品质的影响。提出了今后的研究方向。     

宁夏新型城镇化与人居环境发展时空耦合关系分析

为研究新型城镇化背景下宁夏城镇化发展水平与人居环境的协调关系问题,利用协调度与耦合度评价模型,测算宁夏5个地级市2005—2015年新型城镇化与人居环境协调度指数与耦合度指数,并分析5 个地级市耦合协调度的时空演化特征。结果表明：（1）从整体发展态势看,2005—2015 年研究区除固原市和中卫市外,各市新型城镇化与人居环境协调度指数、耦合度指数均呈现良好上升趋势;（2）从时间序列看,研究区新型城镇化与人居环境协调关系大部分处于高度协调阶段,耦合度除中卫市和固原市外,基本处于磨合阶段与高水平耦合阶段;（3）从空间格局看,研究区新型城镇化与人居环境耦合协调度差异不大,各市均有较高的耦合度。通过分析研究,针对研究区新型城镇化建设与人居环境发展现状提出建议,包括优化城镇空间格局,加强城镇综合承载力;加强户籍改革,推动农民市民化进程;提高居民环境意识,选择合理的城市发展速度与规模。本研究对城乡规划与城镇化发展具有一定的参考价值。     

乌鲁木齐市自然资源·经济·生态环境系统耦合协调度研究

为了研究乌鲁木齐市自然资源、经济、生态环境子系统之间的耦合协调类型及它们未来的耦合协调度变化,借鉴物理学中的耦合概念,构建了乌鲁木齐市自然资源·经济·生态环境系统耦合协调度指标体系,并根据乌鲁木齐市2001—2013年的相关统计数据,利用耦合协调度数学模型和计算方法,对三者在研究期内整体的耦合协调度演变进行了定量的分析。利用GM(1, 1)预测模型,对研究区未来3年的耦合协调度发展趋势进行了模拟预测。结果表明：2001—2013年间,乌鲁木齐市整体的耦合协调度呈现缓慢上升趋势,其值介于0.279~0.502之间,从2001年的0.279增加到2013年的0.477,但2013年比2012年减少了0.025,从勉强协调变成了濒临失调;预测结果表明：未来3年,乌市自然资源·经济·生态环境系统耦合协调度有所好转,耦合协调度分别是0.476、0.495、0.516,逐渐从濒临失调转换成勉强协调。     

水肥耦合对紫色土中小麦肥料减施效应的影响

为了认识水肥耦合对紫色土中小麦的影响特征及肥料减施效应,在四川盐亭县青峰村和四川盐亭农田生态系统国家野外科学观测研究站的石灰性紫色土上,于2018年10月至2020年5月,用小区和盆栽试验等方法,观测不同水肥耦合处理对小麦和土壤主要属性的影响。结果表明,水肥耦合对小麦生长和籽粒产量有明显的促进效应,浇水到田间持水量的80%左右时,其促进效应最大;肥料用量减少10%~20%,不会造成小麦的明显减产;水肥耦合主要提高了土壤养分有效性和土壤酶的活性,因而有明显的促进效应。水肥耦合是紫色土区减肥增效的一种有效措施,从而能有效防治区域的面源污染。     

Coupling Diffusion Simulation of Volatile Pollutant in the Water and Air

Spill of volatile poisons into natural water bodies causes water pollution and then air pollution arises from water pollution because of volatilization. In order to explain the coupling of water pollution and air pollution, the dimensionless Henry constant of volatile poisons was used to establish coupling diffusion model based on compressed VOF method and the double film theory explained for volatilization. A high resolution bounded differencing scheme for arbitrarily unstructured meshes was applied to simulate coupling diffusion of trichloroethylene and tribromoethylene. The simulation results are in good agreement with those from single phase model. The influence of environmental temperature, wind velocity and the dimensionless Henry constant on the mass transfer across gas liquid interface was analysed.     

农业多元功能耦合与都市型农业生产结构优化

多功能性是都市型农业的基本要求,都市型农业生产结构优化的目标是实现多元功能的最优耦合。以资源为约束、功能为产出、功能价值为效用,运用生产可能性曲线和无差异曲线构建了农业多元功能最优耦合的模型,在此基础上,根据都市型农业的特殊属性,构建了都市型农业多元功能最优耦合的模型,并对都市型农业生产结构优化的分析程序进行了总结。     

Calibration of Nonlinear Dynamical Analysis for RC Frame-wall Structure with Slender Coupling Beams Considering Stiffness Reduction

Two 16-storey frame-wall structures with slender coupling beams in regions of Intensity 8(0.2 g),with and without considering the stiffness reduction of the coupling beams,were designed.Nonlinear dynamic response analyses of two typical frame-wall structures subjected to several ground motions were carried out.The analyses were based on the quasi-tridimensional program for nonlinear dynamic response analysis TS-EPA.The analyses led to the following conclusions: Under rare earthquake actions,the coupling beams in framewall structures yield first.This shows that the coupling beam in frame-wall structures is the member at the forefront of earthquake resistance.Comparison of the analytic results of two couples with and without considering the stiffness reduction of the coupling beam found that,in view of the dynamic response to and the requirement for ductility under rare earthquake motions,reducing stiffness causes a minor unfavorable influence on the dynamic response of frame-wall structures.     

Modeling and Simulation Analysis of the Electromechanical Coupling Facts about Precision Transmission System

Electro-mechanical coupling facts about transmission system influence dynamic characteristic and response characteristic of servo system. The coupling factors of precision transmission system are put forward, and the modelling methods of electro-mechanical system are analyzed. Based on the large-scale precise horizontal machining center, the dynamic chart of servo feed system is gained through analyzing mathematical model of the taehes, and the influence on transmission stiffness and transmission error is simulated in precision transmission system. Through changing parameters in servo feed system, the influence on dynamic characteristic and response characteristic is analyzed, so it provides a mathematical model for parameter optimization.     

Stability Analysis for the Excavation Engineering Under Coupling Effect of Seepage from Heavy Rain and River Fluctuation

The seepage accident is very easily occurred, when the excavation engineering has been constructed in rainy season and it is very easily influenced by the coupling effect of seepage duo to heavy rain and water level fluctuation of neighboring river. So a coupling seepage equation that based on the theory of Dupuit has been established for the ground water in the layered foundation. And then, the water table surrounding the excavation engineering has been determined on the consideration of the coupling effect of seepage duo to heavy rain and water level fluctuation of river. In the meantime, by means of the theory of coupling analysis of stress and seepage and the software of Midas, a model of coupling analysis of stress and seepage has been built for the specific excavation engineering and the seepage destroy characteristics of this project has been researched.     

河南省各地级市经济与环境耦合关联分析

探究河南省各地市经济与环境因子相互作用情况,旨在全面认清各市经济与环境的耦合度现状,为各区域政策的制定与调整提供借鉴,实现河南省经济与环境的协调发展。基于对河南省18市2008—2012年各项指标数据,运用灰色关联分析法构建出区域经济与环境内部各因子相互作用的关联度模型和耦合度模型,用定量方法分析经济与环境系统耦合的主要因素,并从时间和空间两个角度分析两者之间的关系。结果表明,河南省各地市经济发展对生态环境的胁迫作用以及生态环境对经济发展的约束性都较大,其中环境建设和环境治理对经济发展的约束性最大,而经济结构和经济实力对生态环境胁制作用最大。河南省各地市经济与环境耦合度空间分异规律显著,大致将其划分为协调、磨合、拮抗和低水平耦合4种类型,其中以磨合、拮抗类型为主;2008—2012年河南省各地市经济与环境耦合度总体呈上升趋势,但期间耦合度时序变动较大。     

甘草水肥耦合效应初探

针对新疆人工种植甘草产量低、水肥利用效率不高的生产状况,以水肥耦合为中心,通过二次回归通用旋转组合设计方案,建立回归模型并进行效应解析,结果表明：在灌水量、施肥量充足情况下,甘草产量与灌水量、施肥量呈抛物线关系;水肥耦合效应明显,具有明显增产效果,在灌水量为：255.56mm、施肥量为：900.00kg/hm2时,甘草产量达到13226.48kg/hm2,但过多的水肥投入并不有利于甘草增产,在灌水量超过273.3mm或施肥超过900.00kg/hm2时,甘产产量呈下降趋势