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Back analysis of mechanical parameters of roller compacted concrete dam

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Science china(Technological Sciences) 2010年第3期53卷 848-853页

作者： GU ChongShi 1,2,3,LI Bo 1,XU GuangLei 4 &YU Hong 1,2,3 1 State Key laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai university,nanjing 210098,china 2College of Water Conservancy Hydropower,Hohai university,nanjing 210098,china 3national Engineering research Center of Water Resources Engineering Safety,Efficient Utilization and nanjing 210098,china 4 nanjing Hydraulic research Institute,nanjing 210029,china 1. State Key laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 China2. College of Water Conservancy Hydropower Hohai University Nanjing 210098 China3. National Engineering Research Center of Water Resources Engineering Safety Efficient Utilization and Nanjing Nanjing 210098 China4. Nanjing Hydraulic Research Institute Nanjing 210029 China

In view of the diversity and complexity of mechanical parameters of roller compacted concrete dam(RCCD),the uniform design method,partial least-squares regression(PLS)and least squares support vector machine(LSSVM)were applied to the back analysis of RCCD with the use of the complex nonlinear relationship between dam mechanical parameters and dam *** the process of back analysis,the initial samples of parameters were designed with uniform design ***,a transversely isotropic model of RCCD was established by *** *** this model,training samples of LSSVM model could be *** then,the complex nonlinear relationship between relative values of hydraulic components of dam displacements and mechanical parameters was ***,actual relative values of dam hydraulic components are isolated from the measured data of dam displacements by using *** inputting the isolated relative values into LSSVM model,the back analysis values of RCCD mechanical parameters can be *** example analysis showed that mechanical parameters obtained by the above-mentioned back analysis method are reasonable,and the back analysis method is feasible.

关键词： roller compacted concrete dam mechanical parameters back analysis

PERFORMANCE OF THE ZERO FORCING PRECODING MIMO BROADCAST SYSTEMS WITH CHANNEL ESTIMATION ERRORS

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Journal of Electronics(china) 2007年第4期24卷 490-495页

作者： Wang Jing Liu Zhanli Wang Yan You Xiaohu national mobile communications research Lab Southeast University Nanjing 210096 China

In this paper, the effect of channel estimation errors upon the Zero Forcing (ZF) precoding Multiple Input Multiple Output Broadcast (MIMO BC) systems was studied. Based on the two kinds of Gaussian estimation error models, the performance analysis is conducted under different power allocation strategies. Analysis and simulation show that if the covariance of channel estimation errors is independent of the received Signal to Noise Ratio (SNR), imperfect channel knowledge deteriorates the sum capacity and the Bit Error Rate (BER) performance severely. However, under the situation of orthogonal training and the Minimum Mean Square Error (MMSE) channel estimation, the sum ca- pacity and BER performance are consistent with those of the perfect Channel State Information (CSI) with only a performance degradation.

关键词： Zero Forcing (ZF) Multiple Input Multiple Output BroadCast (MIMO BC) system Channel estimation errors Sum capacity

A 10 GHz multiphase LC VCO with a ring capacitive coupling structure

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Science china(Information Sciences) 2012年第11期55卷 2656-2662页

作者： CHEN YingMei,WANG Hui,YAN ShuangChao & ZHANG Li Institute of RF-& OE-ICs,southeast university,nanjing 210096,china 1. Institute of RF- & OE-ICs Southeast University Nanjing 210096 China

A multiphase LC voltage-controlled oscillator(VCO) with a novel capacitive coupling CL ladder filter structure is proposed in this paper and this 10 GHz eight-phase VCO is applied in clock and data recovery(CDR) circuit for 40 Gb/s optical communications *** with the traditional eight-phase oscillator,this capacitive coupling structure can decrease the number of inductors to half and only of four *** VCO is designed and taped out in TSMC 65 nm CMOS *** results show the phase noise is 105.95 dBc/Hz at 1MHz offset from a carrier frequency of 10 *** chip area of VCO is 480 μm×700 μm and the VCO core power dissipation is 4.8 mW with the 1.0 V supply voltage.

关键词： voltage controlled oscillator(VCO) clock and data recovery(CDR) eight-phase capacitive coupling CL ladder filtering

宽带CDMA系统中最大多普勒频移估计方法的研究

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通信学报 2004年第6期25卷 157-165页

作者：盛彬尤肖虎东南大学移动通信国家重点实验室江苏南京210096

估计最大多普勒频移或者是移动台的速度对于优化接收机的性能至关重要。本文主要研究了宽带码分多址通信系统中四种最大多普勒频移的估计方法并通过对WCDMA系统的理论计算和计算机仿真比较了它们在具有各向同性散射体和高斯噪声的瑞利... 详细信息

估计最大多普勒频移或者是移动台的速度对于优化接收机的性能至关重要。本文主要研究了宽带码分多址通信系统中四种最大多普勒频移的估计方法并通过对WCDMA系统的理论计算和计算机仿真比较了它们在具有各向同性散射体和高斯噪声的瑞利信道中的性能差异。

关键词：宽带码分多址最大多普勒频移瑞利衰落信道

research on the evaluation model of the modernization level of urban construction in Jiangsu Province,china

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Science china(Technological Sciences) 2010年第9期53卷 2510-2514页

作者： YANG JunYan1 & CHEN Wen2 1 School of Architecture,southeast university,nanjing 210096,china 2 nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,nanjing 210008,china 1. School of Architecture Southeast University Nanjing 210096 China2. Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China

The modernization of urban construction is a key index in the process of urbanization,and also is an important index to measure the level of socio-economic and cultural *** paper analyzes and explores the related concepts of modernization of urban construction,analyzes the situation and identity of urban construction layer by layer so as to establish an evaluation index system of the modernization level of urban construction and then the paper evaluates the modernization level of urban construction from four different angles,which are the perspectives of the urban planning control,the level of urban facilities,urban management,urban construction *** later analyzes the evaluation results by choosing Jiangsu Province as a research hierarchy from the scale chains of urban study and makes efforts to the operative and directive development direction.

关键词： modernization of urban construction index system evaluation model

A 12×10 Gb/s fully integrated CMOS parallel optical receiver front-end amplifier array

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Science china(Information Sciences) 2012年第6期55卷 1415-1428页

作者： LI ZhiQun,CHEN LiLi,LI Wei & ZHANG Li Institute of RF-& OE-ICs,southeast university,nanjing 210096,china 1. Institute of RF-& OE-ICs Southeast University Nanjing 210096 China

This paper presented a 12-channel parallel optical receiver front-end amplifier array design and realization in a low cost 0.18 μm CMOS *** channel incorporated a transimpedance amplifier and a limiting *** meet the challenge for the design of high gain front-end amplifier at date rate of up to 10 Gb/s,an optimized circuit topology was proposed and some bandwidth extension technologies were adopted,including regulated cascode,shunt peaking,and active negative *** the power consump-tion,crosstalk and noise,some corresponding solutions were presented such as applying isolation structure for parallel amplifier array,and optimization of noise and circuit parameters for 10 Gb/s *** on-wafer measurements revealed that this chip’s operation speed reached up to 10 Gb/s per channel,and 120 Gb/s with 12-channel in parallel *** a DC power of 853 mW from a 1.8 V supply voltage,the chip exhibits a conversion gain of up to 92.6 dBΩ,and a 3 dB bandwidth of 8 GHz,the output swing and input sensitivity for a bit-error rate of 10 12 at 10 Gb/s are 310 mV and 10 mVpp,*** chip size is 1142 μm×3816 μm including on-wafer testing pads.

关键词： CMOS parallel optical receiver amplifier array transimpedance amplifier limiting amplifier crosstalk isolation structure noise current

MMSE relay precoding schemes based on quantization error compensation for multi-relay system

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Science china(Information Sciences) 2010年第12期53卷 2548-2556页

作者： LI Ting 1,2 & YANG LuXi 2 1 College of Communication and Information Engineering,nanjing university of Posts and Telecommunications,nanjing 210003,china 2 School of Information Science and Engineering,southeast university,nanjing 210096,china 1. College of Communication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China2. School of Information Science and Engineering Southeast University Nanjing 210096 China

In order to deal with the performance degradation resulting from the quantization error,this paper introduces the statistics of Grassmannian codebook's quantization error into relay precoding design for multirelay *** on the two-step MMSE optimization algorithm for relay precoding and receiver equalizing with full feedback under QoS requirements,we first propose a limited feedback two-step MMSE optimization scheme for relay precoding and receiver equalizing with quantization error compensation,and then we propose a limited feedback joint MMSE optimization scheme for relay precoding and receiver equalizing with quantization error compensation subject to a global power constraint at the output of *** results show that the proposed joint MMSE optimization scheme with quantization error compensation has a much lower bit-error rate than the two-step MMSE optimization scheme with quantization error compensation and the joint MMSE optimization scheme without quantization error compensation.

关键词： multi-relay precoding limited feedback minimum mean square error

A novel method to analyze damping effect of VSC based FACTS

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Science china(Technological Sciences) 2008年第12期51卷 2112-2119页

作者： DU WenJuan1,WANG HaiFeng2 & CHENG ShiJie3 1 southeast university,nanjing 210096,china 2 Queen’s university of Belfast,Belfast,BT9 5AH,UK 3 Huazhong university of Science and Technology,Wuhan 430074,china State Key laboratory of Hydraulics and Mountain River Engineering Sichuan University Chengdu 610065 China

A novel method to analyze the damping effect of the VSC based FACTS(VBF) device is proposed,which is developed on the basis of the well-known equalarea criterion and small-disturbance analysis of power system *** use of the proposed method,two conclusions are obtained for study of the damping effect of the *** research results clearly show the contribution of the VBF control to the damping of power system *** results of an example power system are used to verify the effectiveness of the proposed method.

关键词： power system low frequency oscillations FACTS equal-area criterion

Special magnetic phenomena in heavily doped La_(0.7-x)Dy_xSr_(0.3)MnO_3 system

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Science china(Physics,Mechanics & Astronomy) 2008年第1期51卷 90-97页

作者： LIU Ning 1,2 ,YAN GuoQing 1,3 ,CAI ZhiRang 1 ,PI Li 2 ,ZHANG Bei 2 &TONG Wei 2 1 Department of Physics,Suzhou College,Suzhou 234000,china 2 Structure research laboratory,university of Science and Technology of china,Hefei 230026,china 3 national laboratory of Solid State Microstructures,Physics Department,nanjing university,nanjing 210093,china 1. Department of Physics Suzhou College Suzhou 234000 China 2. Structure research laboratory University of Science and Technology of China Hefei 230026 China 3. national laboratory of Solid State Microstructures Physics Department Nanjing University Nanjing 210093 China

The magnetism in heavily Dy doped La0.7-xDyxSr0.3MnO3(0.40≤x≤0.70)system is studied in this *** M-T relation seems to be complicated with the increase of *** sample with x=0.40,AFM behavior exists at T≤TN and M-T curves under zero field cooling(ZFC)and field cooling(FC)exhibit typical behavior of spincluster glass state above *** the sample with x=0.50,the M-T curve under ZFC exhibits a valley at a low temperature while the M-T curve under FC exhibits the negative magnetization below *** samples with x=0.60,0.70,their ZFC M-T curves are similar to that of x=0.50,but the FC M-T curves do not exhibit negative values any *** the peculiar phenomena above are well explained by Néel double-lattice model combined with M-H relation at typical *** molecular field theory fits well the negative magnetization for x=0.50.

关键词： heavily doped special magnetic phenomena double-lattice model