Seismic strengthening of reinforced concrete columns damaged by rebar corrosion using combined CFRP and steel jacket

In order to study the effectiveness of combined carbon fiber-reinforced polymer （CFRP） sheets and steel jacket in strengthening the seismic performance of corrosion-damaged reinforced concrete （RC） columns, twelve reinforced concrete columns are tested under combined lateral cyclic displacement excursions and constant axial load. The variables studied in this program include effects of corrosion degree of the rebars, level of axial load, the amount of CFRP sheets and steel jacket. The results indicate that the combined CFRP and steel jacket retrofitting technique is effective in improving load-carrying, ductility and energy absorption capacity of the columns. Compared with the corrosion-damaged RC column, the lateral load and the ductility factor of many strengthened columns increase more than 90% and 100%, respectively. The formulae for the calculation of the yielding load, the maximum lateral load and the displacement ductility factor of the strengthened columns under combined constant axial load and cyclically increasing lateral loading are developed. The test results are also compared with the results obtained from the proposed formulae. A good agreement between calculated values and experimental results is observed.

Gravity and magnetic anomalies field characteristics in the South China Sea and its application for interpretation of igneous rocks

Igneous rocks in the South China Sea have broad prospects for oil and gas exploration.Integrated geophysical methods are important approaches to study the distribution of igneous rocks and to determine and identify igneous rock bodies.Aimed at the characteristics of gravity and magnetic fields in the South China Sea,several potential field processing methods are preferentially selected.Reduction to the pole by variable inclinations in the area of low magnetic latitudes is used to perform reduction processing on magnetic anomalies.The preferential continuation method is used to separate gravity and magnetic anomalies and extract the gravity and magnetic anomaly information of igneous rocks in the shallow part of the South China Sea.The 3D spatial equivalent distribution of igneous rocks in South China Sea is illustrated by the 3 D correlation imaging of magnetic anomalies.Since the local anomaly boundaries are highlighted gravity and magnetic gradients,the distribution characters of different igneous rocks are roughly outlined by gravity and magnetic correlation analysis weighted by gradient.The results show the distribution of igneous rocks is controlled and influenced by deep crustal structure and faulting.

浮选柱在国外钼选矿厂的应用情况

1963年加拿大布延和特列勃发明了浮选柱并获得了该国特许专利。在80年代以前浮选柱一直处于停滞不前的状况,只是在近几年进展较快,而且应用日见增多。在美国亚利桑那州的西尔里塔铜钼选矿厂进行了浮选柱的试验工作,该厂日处理7万吨铜钼矿,铜品位0.3％,钼品位0.035％。在浮选的精矿回路安装了两台浮选柱,在回收率不变的情况下,铜品位提高了2～3个百分点,达28～29％,钼的品位也有些增加。

阿萨拉格齐蒙古史(续四)

古莫利济农长子诺颜达刺济农,其子布延巴图尔洪台吉、诺木图台吉、斡木布台吉、吉布希台吉、莽古思楚琥尔.布延巴图尔洪台吉子布希图济农.乌勒济宾图、班迪卓里克图.诺木图台吉子班迪都楞、满珠希里台吉.莽古思楚琥尔子布嘎布勒洪台吉、布达希里、博恩巴岱、博恩巴、布延台、阿巴海.古莫利济农次子拜桑固尔郎台吉,其子爱迪必斯达延台吉、奥巴卓里克图、塔纳齐宰桑台吉.爱迪必斯达延台吉子阿齐图达延台吉、额成黑台吉、莫迪台吉.奥巴卓里克图子阿南达和硕齐、伊木僧格、绰克图台吉、多尔吉台吉、陶巴台吉.古莫利济农三子卫达尔玛诺木欢台吉,其子达希和硕齐洪台吉、海诺孩巴图尔、阿黑雅昆都楞岱青、楚鲁琥青巴图尔、胡思勒卫征卓里克图、多尔吉台吉、洪固尔彻辰.达希和硕齐洪台吉子沙刺、乞答特.海诺孩巴图尔子乞答特都刺哈喇、胡策格齐台吉、图密台吉、玛寨台吉、胡则泰台吉.阿黑雅昆都楞岱青子卫莫孙台吉、彻辰台吉.楚鲁琥青巴图尔子哈达、青.胡思勒卫征子多尔吉台吉、萨囊台吉.多尔吉台吉子兀努衮洪台吉、伊希衮台吉、善巴达拉台吉.

Incremental Placement Algorithm for Timing and Routability Optimization

A new approach of incremental placement approach is described.The obtained timing information drives an efficient net-based placement technique,which dynamically adapts the net weights during successive placement steps.Several methods to combine timing optimization and congestion reducing together are proposed.Cells on critical paths are replaced according to timing and congestion constraints.Experimental results show that our approach can efficiently reduce cycle time and enhance route ability.The max path delay is reduced by 10% on an average afterincremental placement on wirelength-optimized circuits.And it achieves the same quality with a high speed up compared to timing driven detailed placement algorithm.

中国林科院寒温带林业研究中心学术委员会召开第二次会议

2016年6月30日至7月1日,中国林科院寒温带林业研究中心学术委员会在黑龙江省抚远市召开第二次会议。

明杜瓊致吴寬《榮登帖》

明朝成化八年(1472年)歲在壬辰,朝廷開科取士。吳門舉子吳寬,會試、廷試均為第一名,轟動朝野,名聞天下,成為一時佳話。 在他的家鄕,有個著名學者杜瓊,知道此事後非常高興,便給吳寬寫了一封信,即《榮登帖》,除表示祝賀外,并拜求作《重建延綠亭記》一首。其内容大意如下:

Path-Based Timing Optimization by Buffer Insertion with Accurate Delay Model

An algorithm of path based timing optimization by buffer insertion is presented.The algorithm adopts a high order model to estimate interconnect delay and a nonlinear delay model based on look up table for gate delay estimation.And heuristic method of buffer insertion is presented to reduce delay.The algorithm is tested by industral circuit case.Experimental results show that the algorithm can optimize the timing of circuit efficiently and the timing constraint is satisfied.

On the Backlog and Delay Distributions of Primary and Secondary Users in a Cognitive Radio Network

In a cognitive radio network, the secondary users can use the spectrum holes when the primary users do not utilize the spectrum, but they must vacant the spectrum when the primary users need to transmit data on the spectrum. In other words, the primary users have higher priority over the secondary users. In this paper, backlog and delay distribution bounds for both primary users and secondary users are obtained. The analysis is based on stochastic network calculus, for which, stochastic service curves are t-n-st derived for both primary users and secondary users, and the network calculus independent case analysis approach is used to find the distribution bounds. Numerical results and simulation results are also presented and discussed.

Synchronization of a Class of Delayed Neural Networks with Sector Nonlinearity

In this paper, global synchronization is discussed for a general class of delayed neural networks with time-varying and distributed delays. Furthermore, the activation func- tions in the neural networks can be different type. Based on the drive-response concept and the Lyapunov stability theorem, some sufficient criteria are obtained to guarantee the global synchronization of the considered models even when input sector nonlinearity caused by physical limitations is presented in response systems. Finally, a typical example is also given to illustrate the effectiveness of the proposed synchronization scheme.

Mean-square Exponential Robust Stability for a Class of Grey Stochastic Systems with Distributed Delays

Two easily verified delay-dependent criteria of mean-square exponential robust stability are obtained by constructing Lyapunov-Krasovskii functional and employing the decomposition technique of the continuous matrix-discovered set of grey matrix and Ito formula.A numerical example shows the validity and practicality of the criteria presented in this paper.

A Note on ＂Global Exponential Convergence Analysis of Hopfield Neural Networks with Continuously Distributed Delays＂

In this note, we would like to point out that （i） of Corollary 1 given by Zhang et al. （cf Commun. Theor. Phys. 39 （2003） 381） is incorrect in general.

Leibniz＇s Conception of Space： The Space of Life and the Holographic Universe

The paper provides an interpretation of Leibniz＇s account of space that extends beyond the predominant interpretations in terms of the relativity of space, and the latter is mainly understood through the differential perspective of each monad＇s extrinsic denominators. This is attained by a thorough explication of the principle of indiscernibles, the abolition of the principle of locality, the advanced conception ofentelecheia in late Leibniz, and the character of the perception of each monad, which allow to discover in Leibniz＇s idea of space the notion of the hologram, and the holographic interconnectedness of things in the Universe.

Novel Tunable PMD Compensation Technology Using Linear Chirped Fiber Bragg Grating

Based on uniform fiber Bragg grating bonded with a magnetostrictive rod in the non-uniform magnetic field,a novel PMD compensation technique is proposed.This all-fiber PMD compensation technology is cost-effective and flexible in designing the differential group delay profile.

Mechanism of improving ductility of high strength concrete T-section beam confined by CFRP sheet subjected to flexural loading

For the purpose of inventing a new seismic retrofitting method for the reinforced high strength concrete （HSC） T-section beam using carbon fiber reinforced polymer （CFRP） sheet, three series, a total of twelve T-section beams with nine specimens confined by CFRP sheet in the plastic zone and three control beams were conducted up to failure under four-point bending test. The effectiveness of confining CFRP sheet on improving the flexural ductility of tmstrengthened T-section beams was studied. The parameters such as the width and the thickness of CFRP sheet and the type of T-section were analyzed. The experimental results show that ductility and rotation capacity of plastic hinge can be improved by the confinement of CFRP sheet, and the ductility indices increase with the increment of width and thickness of CFRP sheet. A plastic rotation model considering the width of CFRP sheet and the effect of flange of T-section beam is proposed on the basis of the model of BAKER, and the test results show a good agreement with the perdicted results. The relevant construction suggestions for seismic retrofitting design of beam-slabs system in cast-in-place framework structure are presented.

谈CSS Sprites技术在网页设计中的应用

减少页面的HTTP请求次数是提高网页显示速度最有效的方法之一,为了减少HTTP请求次数,最有效最直接的方法是使用精灵图片(CSS Sprites),精灵图片是把许多小图片放到一张大图片里面,通过CSS来显示图片的一部分。

张会理:无言战友牵着魂儿

警犬贝特平静地躺着,忽然非常吃力地把那只打着点滴的前腿伸出来,哆嗦着搭在张会理的手上,然后慢慢地闭上眼睛,永远闭上了眼睛。

THE GLOBAL STABILITY OF A COMPETING CHEMOSTAT MODEL WITH DELAYED NUTRIENT RECYCLING

In this paper, by applying the method of Liapunov functionals we study the global stability of the positive equilibrium of a competing chemostat model with delayed nutrient recycling. The sufficient conditions of the global stability (involved in average time delay or not) are obtained.

Fault Detection for Complex Systems with Channel Fadings, Randomly Occurring Multiple Delays and Infinitely Distributed Delays

This paper is concerned with the fault detection（FD） problem for a class of discretetime stochastic systems with channel fadings, randomly occurring multiple communication delays,and infinitely distributed delays. All of the three phenomena have the characteristics of randomly occurring and three sequences of stochastic variables which are mutually independent but obey the Bernoulli distribution are employed to describe them. The aim of this paper is to design an FD filter such that the FD dynamics is exponentially stable in the mean square and, at the same time, the error between the residual signal and the fault signal is made as small as possible. Intensive analysis is utilized to derive the sufficient conditions for the designed FD filter, which guarantees the exponential stability and the prescribed H∞ performance. FD filter parameters are obtained by solving a convex optimization problem. An illustrative example is provided to demonstrate the effectiveness of the FD design scheme.

End-to-end delay analysis for networked systems

End-to-end delay measurement has been an essential element in the deployment of real-time services in networked systems. Traditional methods of delay measurement based on time domain analysis, however, are not efficient as the network scale and the complexity increase. We propose a novel theoretical framework to analyze the end-to-end delay distributions of networked systems from the frequency domain. We use a signal flow graph to model the delay distribution of a networked system and prove that the end-to-end delay distribution is indeed the inverse Laplace transform of the transfer function of the signal flow graph. ~vo efficient methods, Cramer＇s rule-based method and the Mason gain rule-based method, are adopted to obtain the transfer function. By analyzing the time responses of the transfer function, we obtain the end-to-end delay distribution. Based on our framework, we propose an efficient method using the dominant poles of the transfer function to work out the bottleneck links of the network. Moreover, we use the framework to study the network protocol performance. Theoretical analysis and extensive evaluations show the effectiveness of the proposed approach.