“以小控大”古镇水体景观空间塑造技巧探索——以四川省邛崃市汉风酒城景观规划设计为例

文章从布局形态和园林小品大小两个层次,以及"环、线、点"三个方面综合分析了汉风酒城古镇水体景观空间的塑造手法,探讨理水技巧。由于其水体景观空间塑造手法的实用性和鲜明性十分突出,在当下古镇泛滥建设和水资源匮乏的环境下,这种塑造手法尤其值得我们学习和思考。

西门子6RA70装置在825轧机上的应用

北满特钢轧钢厂825轧机的电气控制系统,为20世纪90年代初的逻辑无环流控制系统,其控制系统为模拟系统。多年来由于系统的不稳定性,系统事故频繁出现,严重地影响了生产钢材轧制效率。自从采用了6RA70全数字直流调速装置,825轧机得到了正常运行,提高生产效率近30%。

Two-echelon inventory model with service level constraint and controllable lead time sensitive to order quantity

The decision-making and optimization of two-echelon inventory coordination were analyzed with service level constraint and controllable lead time sensitive to order quantity.First,the basic model of this problem was established and based on relevant analysis,the original model could be transformed by minimax method.Then,the optimal order quantity and production quantity influenced by service level constraint were analyzed and the boundary of optimal order quantity and production quantity was given.According to this boundary,the effective method and tactics were put forward to solve the transformed model.In case analysis,the optimal expected total cost of two-echelon inventory can be obtained and it was analyzed how service level constraint and safety factor influence the optimal expected total cost of two-echelon inventory.The results show that the optimal expected total cost of two-echelon inventory is constrained by the higher constraint between service level constraint and safety factor.

Study on the Control Technique of "On" and "Off" Years of Early Maturing Citrus unshiu

In order to change the universal phenomenon of alternate bearing of early- grown Satsuma orange （Citrus unshiu Marc.） in north Guizhou province, and provide references for setting scientific cultivation techniques and rational management mea- sures for Satsuma orange gardens, cultivation techniques for controlling alternate bearing of the early-grown Satsuma orange were tested and optimized for 7 years （2005 to 2011）. The results showed that production of local early-grown Satsuma or- ange orchards could be significantly improved through the application of cultivation techniques such as rational trimming, strengthening soil, fertilizer and water manage- ment, conducting flower and fruit management pertinently, effective and comprehen- sive control of disease and insects. The yield difference between ＂on＂ and ＂off＂ years was 10%-15%, and the orchards with serious alternate bearing phenomenon were changed into the one with high and stable yield. Meanwhile, the commercial rate of early-grown Satsuma orange fruit enhanced, leading to good economic benefits.

Adaptive robust output force tracking control of pneumatic cylinder while maximizing/minimizing its stiffness

The system considered in this work consists of a cylinder which is controlled by a pair of three-way servo valves rather than a four-way one.Therefore,the cylinder output stiffness is independently controllable of the output force.A discontinuous projection based adaptive robust controller (ARC) was constructed to achieve high-accuracy output force trajectory tracking for the system.In ARC,on-line parameter adaptation method was adopted to reduce the extent of parametric uncertainties due to the variation of friction parameters,and sliding mode control method was utilized to attenuate the effects of parameter estimation errors,unmodelled dynamics and disturbance.Furthermore,output stiffness maximization/minimization was introduced to fulfill the requirement of many robotic applications.Extensive experimental results were presented to illustrate the effectiveness and the achievable performance of the proposed scheme.For tracking a 0.5 Hz sinusoidal trajectory,maximum tracking error is 4.1 N and average tracking error is 2.2 N.Meanwhile,the output stiffness can be made and maintained near its maximum/minimum.

The Study on the Sports Injuries and Psychological Stress of Chinese Elite Players

Through national gymnastics to 30 active athletes and 30 national women＇s handball training athletes, which results in the paper are as follows： outstanding gymnastics. The main part of injury is elbow, ankle, and the degree of damage to elbow as the worst. Women＇s handball player injury occurred campaign main pan is knees joint, ankle, with the most serious level of knee injuries. Outstanding women athletes in gymnastics and handball injury occurred campaign＇s state anxiety level is higher, were reached 49.37 ± 94 and 49. 00 ±61.3, excellent gymnast sports injury of the main source of stress for coach criticism, leading opponent table Now when the good. Good men＇s gymnastics athlete sports injury of main source of stress for physical or psychological made a mistake, coach criticism, suffered severe pain or injury After. Outstanding female handball player of the main source of the sports injury stress for the referee injustice, not the bad climate space equipment and error, etc. 4, excellent gymnastics The main way to deal with the players face for attributed to the outside world not controllable factors, focus your attention on the action or distracting, excellent handball in the athletes to diversify To strengthen the way to deal with the game for faith, quickly forget unhappy experience and experience of stress take more carefully way. The abstract should summarize the contents of the paper and should contain at least 70 and at most 150 words. It should be set in 9-point font size and should be inset 1.0 cm from the fight and left margins. There should be two blank （10-point） lines before and aiter the abstract. This document is in the required format.

Stablility and Size Control of Silver Nanoparticles by Electrochemical Method

Silver nanoparticles （Ag-NPs） were prepared using an electrochemical technique. The optical properties were measured by absorption spectroscopy. The dimension of the prepared nanoparticles as estimated by the Atomic Force Microscope （AFM）, was 91.57 nm. This reaserch effort proposes a mechanism for reducing the size of silver nanoparticles by adding the hydrogen peroxide （H202）, and protecting the silver nanoparticle to inhibit agglomeration by adding PVP polymer.

Despreader for Direct Sequence Spread Spectrum System and Its Performance Analysis

A new type of despreader for direct sequence spread spectrum signal is proposed. Compared with traditional despreaders, the new despreader does not contain hard decision ware or handle binary sequence any more, and the locally stored spread spectrum signals are pre-modulated baseband signals (such as Gaussian minimum shift keying (GMSK) signals), which are much more similar to the received spread spectrum signals. Moreover, the missed detection probability of the despreader is about one order of magnitude lower than that of traditional ones. Based on the maximum likelihood criterion and phase probability density function of demodulated signal, a new method of ana- lyzing the despreaders’ performance is put forward, which is proved to be more accurate than traditional methods according to the numerical results. Finally, an adaptive despreader under different signal-to-noise ratios is given.

炮采工作面控顶新法

炮采工作面的控顶距通常为3～4排控顶,即最小控顶距3米,最大控顶距4米,放顶步距1米。但从顶板受压的控顶面积考虑,其控顶距越小越好,因采场压力与控顶距成正比。在此理论基础上,平顶山高庄矿炮采工作面控顶距由过去的3～4排改为2～3排,即最小控顶距2米,最大控顶距3米,放顶步距1米,通过三年多的实践,

Optimal Output Feedback Control and Stabilization for NCSs with Packet Dropout and Delay: TCP Case

This paper considers the output feedback control and stabilization problems for network control systems（NCSs） with packet dropout and input delay, and the TCP（transmission control protocol） case is mainly investigated. Specifically, whether the control signal is lost can be acknowledged by the receiver in the NCSs. The main contributions are： 1） For the finite horizon case, the ＂optimal＂output feedback control is derived by using the dynamic programming approach, and it is noted that the separation principle holds for the considered situation; 2） For the infinite horizon case, for the first time, the necessary and sufficient stabilization conditions are derived for NCSs with packet dropout and delay.