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Selective dissolution of eodiagenesis cements and its impact on the quality evolution of reservoirs in the Xing＇anling Group,Suderte Oil Field, Hailar Basin, China

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Petroleum Science 2016年第3期13卷 402-417页

作者： zhen-zhen jia Cheng-Yan Lin Li-Hua Ren Chun-Mei Dong School of Geosciences China University of Petroleum Qingdao 266580 Shandong China Key Laboratory of Reservoir Geology in Shandong Province Qingdao 266580 Shandong China

Reservoirs in the Xing＇anling Group in the Suderte Oil Field,Hailar Basin exhibit ultra-low to low permeability and high tuffaceous material *** study comprehensively analyzed diagenesis and quality evolution of these low-permeability reservoirs using thin sections,SEM samples,rock physical properties,pore water data,as well as geochemical numerical *** and analcite are the two main types of cements precipitated in the eodiagenetic stage at shallow burial depths in the *** two cements occupied significant primary intergranular pores and effectively retarded deep burial *** textures suggest selective dissolution of massive analcite and little dissolution of calcite in the mesodiagenetic *** calculations utilizing the Geochemist＇s Workbench 9.0indicated that the equilibrium constant of the calcite leaching reaction is significantly smaller than that of the analcite leaching reaction,resulting in extensive dissolution of analcite rather than calcite in the geochemical system with both minerals *** simulations with constraints of kinetics and pore water chemistry demonstrated that the pore water in the Xing＇anling group is saturated with respect to calcite,but undersaturated with analcite,leading to dissolution of large amounts of analcite and no dissolution of *** secondary intergranular pores have formed in analcite-cemented reservoirs from selective dissolution of analcite in the mesodiagenetic stage;the analcite dissolution formed preferential flow paths in the reservoirs,which promoted feldspar dissolution;and dissolution of such minerals led to the present reservoirs with medium porosity and low ***-cemented tight reservoirs have not experienced extensive dissolution of cements,so they exhibit ultra-low porosity and permeability.

关键词： Eodiagenetic cements Calcite Analcite Selective dissolution Secondary porosity Hailar Basin

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Control method for exoskeleton ankle with surface electromyography signals

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Journal of Shanghai University(English Edition) 2009年第4期13卷 270-273页

作者：张震王震蒋佳芯钱晋武 School of Mechatronics Engineering and Automation Shanghai University

This paper is concerned with a control method for an exoskeleton ankle with electromyography （EMG） signals. The EMG signals of human ankle and the exoskeleton ankle are introduced. Then a control method is proposed to control the exoskeleton ankle using the EMG signals. The feed-forward neural network model applied here is composed of four layers and uses the back-propagation training algorithm. The output signals from neural network are processed by the wavelet transform. Finally the control orders generated from the output signals are passed to the motor controller and drive the exoskeleton to move. Through experiments, the equality of neural network prediction of ankle movement is evaluated by giving the correlation coefficient. It is shown from the experimental results that the proposed method can accurately control the movement of ankle joint.

关键词： electromyography (EMG) exoskeleton ankle neural network control method

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Integration of Electrical Properties and Polarization Loss Modulation on Atomic Fe–N‑RGO for Boosting Electromagnetic Wave Absorption

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Nano-Micro Letters 2025年第2期17卷 517-532页

作者： Kaili Zhang Yuefeng Yan zhen Wang Guansheng Ma Dechang jia Xiaoxiao Huang Yu Zhou State Key Laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin 150001People’s Republic of China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China MIIT Key Laboratory of Advanced Structural‑Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001People’s Republic of China

Developing effective strategies to regulate graphene’s conduction loss and polarization has become a key to expanding its application in the electromagnetic wave absorption(EMWA)*** on the unique energy band structure of graphene,regulating its bandgap and electrical properties by introducing heteroatoms is considered a feasible ***,metal-nitrogen doping reduced graphene oxide(M–N-RGO)was prepared by embedding a series of single metal atoms M–N_(4) sites(M=Mn,Fe,Co,Ni,Cu,Zn,Nb,Cd,and Sn)in RGO using an N-coordination atom-assisted *** composites had adjustable conductivity and polarization to optimize dielectric loss and impedance matching for efficient EMWA *** results showed that the minimum reflection loss(RL_(min))of Fe–N-RGO reaches−74.05 dB(2.0 mm)and the maximum effective absorption bandwidth(EAB_(max))is 7.05 GHz(1.89 mm)even with a low filler loading of only 1 wt%.Combined with X-ray absorption spectra(XAFS),atomic force microscopy,and density functional theory calculation analysis,the Fe–N_(4) can be used as the polarization center to increase dipole polarization,interface polarization and defect-induced polarization due to d-p orbital hybridization and structural ***,electron migration within the Fe further leads to conduction loss,thereby synergistically promoting energy *** study demonstrates the effectiveness of metal-nitrogen doping in regulating the graphene′s dielectric properties,which provides an important basis for further investigation of the loss mechanism.

关键词： Electromagnetic wave absorption Fe-N-RGO Dipole polarization Conduction loss Impedance matching

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碳酸乙烯酯添加剂对BMImBF_4离子液体作为镁沉积—溶解电解液的改性研究

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化学学报 2008年第2期66卷 175-180页

作者：努丽燕娜杜国栋冯真真沈佳妮杨军上海交通大学化学化工学院上海200240

利用恒电流沉积-溶解、交流阻抗、XRD和SEM方法研究了在室温下EC(碳酸乙烯酯)添加剂对BMImBF_4离子液体作为镁沉积电解液的改善情况.在Mg(CF_3SO_3)_2浓度为0.3 mol·L^(-1)的BMImBF_4电解液中加入w=5%(质量分数)的EC后,沉积—溶解循环... 详细信息

利用恒电流沉积-溶解、交流阻抗、XRD和SEM方法研究了在室温下EC(碳酸乙烯酯)添加剂对BMImBF_4离子液体作为镁沉积电解液的改善情况.在Mg(CF_3SO_3)_2浓度为0.3 mol·L^(-1)的BMImBF_4电解液中加入w=5%(质量分数)的EC后,沉积—溶解循环过程更加稳定,并且循环次数明显增加,可以达到265次以上;交流阻抗结果显示,膜电阻和电荷转移电阻有所减少;从SEM图可以观察到,在沉积初期原本枝晶态的镁在加入EC后以颗粒状沉积.可能是EC添加剂在反应中形成的低聚物覆盖在镁的表面,抑制了枝晶的形成.

关键词：离子液体 BMImBF4 碳酸乙烯酯沉积-溶解镁电池

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Linear generalized synchronization of chaotic systems with uncertain parameters

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Journal of Systems Engineering and Electronics 2008年第4期19卷 779-784页

作者： jia zhen Dept. of Mathematics and Physics Guilin Univ. of Technology Guilin 541004 P. R. China

A more general form of projective synchronization, so called linear generalized synchronization （LGS） is proposed, which includes the generalized projective synchronization （GPS） and the hybrid projective synchronization （HPS） as its special cases, Based on the adaptive technique and Lyapunov stability theory, a general method for achieving the LGS between two chaotic or hyperehaotic systems with uncertain parameters in any scaling matrix is presented. Some numerical simulations are provided to show the effectiveness and feasibility of the proposed synchronization method.

关键词： generalized synchronization chaotic system hyperchaotic system uncertain parameter adaptive technique.

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Research on the iterative method for model updating based on the frequency response function

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Acta Mechanica Sinica 2012年第2期28卷 450-457页

作者： Wei-Ming Li jia-zhen Hong Department of Engineering Mechanics Shanghai Jiaotong University200240 ShanghaiChina

Model reduction technique is usually employed in model updating process. In this paper, a new model updat- ing method named as cross-model cross-frequency response function （CMCF） method is proposed and a new iterative method associating the model updating method with the mo- del reduction technique is investigated. The new model up- dating method utilizes the frequency response function to avoid the modal analysis process and it does not need to pair or scale the measured and the analytical frequency re- sponse function, which could greatly increase the number of the equations and the updating parameters. Based on the traditional iterative method, a correction term related to the errors resulting from the replacement of the reduction ma- trix of the experimental model with that of the finite element model is added in the new iterative method. Comparisons be- tween the traditional iterative method and the proposed itera- tive method are shown by model updating examples of solar panels, and both of these two iterative methods combine the CMCF method and the succession-level approximate reduc- tion technique. Results show the effectiveness of the CMCF method and the proposed iterative method .

关键词： Model updating Model reduction Frequency response function Iteration

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Infinitely Many Solutions for a Class of Quasi-linear Elliptic Problem

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Acta Mathematicae Applicatae Sinica 2024年第3期40卷 728-743页

作者： Xiao-yao jia zhen-luo LOU School of Economics and Management Zhongyuan University of TechnologyZhengzhou 450007China Mathematics and Statistics School Henan University of Science and TechnologyLuoyang 471023China

In this paper,we study the following quasi-linear elliptic equation:■where Ω?R^(N) is a bounded domain,λ>0 is a *** function ψ(|t|)t is the subcritical term,and φ(|t|)t is the critical Orlicz-Sobolev growth term with respect to φ.Under appropriate conditions on φ,ψ and φ,we prove the existence of infinitely many weak solutions for quasi-linear elliptic equation,for λ∈(0,λ_(0)),where λ_(0)> 0 is a fixed constant.

关键词： quasi-linear elliptic equations variational methods Orlicz-Sobolev spaces

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A convergence analysis of the inexact Rayleigh quotient iteration and simplified Jacobi-Davidson method for the large Hermitian matrix eigenproblem

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Science China Mathematics 2008年第12期51卷 2205-2216页

作者： jia ZhongXiao WANG zhen Department of Mathematical Sciences Tsinghua UniversityBeijing 100084China

The inexact Rayleigh quotient iteration (RQI) is used for computing the smallest eigenpair of a large Hermitian matrix. Under certain condition, the method was proved to converge quadratically in literature. However, it is shown in this paper that under the original given condition the inexact RQI may not quadratically converge to the desired eigenpair and even may misconverge to some other undesired eigenpair. A new condition, called the uniform positiveness condition, is given that can fix misconvergence problem and ensure the quadratic convergence of the inexact RQI. An alternative to the inexact RQI is the Jacobi-Davidson (JD) method without subspace acceleration. A new proof of its linear convergence is presented and a sharper bound is established in the paper. All the results are verified and analyzed by numerical experiments.

关键词： eigenvalue eigenvector large Hermite matrix inexact RQI simplified JD convergence misconvergence the uniform positiveness condition 65F15

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Reversibly photochromic wood constructed by depositing microencapsulated/polydimethylsiloxane composite coating

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Journal of Forestry Research 2022年第4期33卷 1409-1418页

作者： zhen jia Wenhui Bao Chengyun Tao Wenlong Song School of Mechanical and Electrical Engineering Northeast Forestry UniversityHarbin 150040People’s Republic of China School of Civil Engineering Harbin UniversityHarbin 150086People’s Republic of China

Photochromic wood was fabricated by coating microencapsulated photochromic material(MP)/polydimethylsiloxane composites onto wood using a simple drop-coating ***-melamine–formaldehyde resin was used to microencapsulate the photochromic material(PM)via in situ *** concentration of the MP affected the photochromic property of the wood *** total color change(ΔE*)reached 82.2 when the concentration of the composite coating is 8%.Adhesion tests confirmed that the composite coating adhered firmly to the *** method is potentially useful for the production of functional wooden products,such as anti-counterfeiting materials and aesthetic wood.

关键词： Wood Photochromism Microencapsulation Urea-melamine–formaldehyde resin Drop-coating method

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Scheme for Preparation of Macroscopic Multi-component Entanglement in Cavity QED

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Communications in Theoretical Physics 2008年第2期49卷 473-476页

作者： jia Lian-Jun YANG zhen-Biao ZHOU zhen-Xiao Department of Physics Lanzhou University Lanzhou 730000 China Department of Electronic Science and Applied Physics Fuzhou University Fuzhou 350002 China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China

We propose a scheme of generating multi-component entangled coherent states of cavity fields. In this scheme, the atoms pass through cavities one by one, simultaneously driven by a strong classical field in each cavity. Then the detection of the atomic states collapses the cavity fields onto multi-component entangled coherent states. It is shown that, with a judicious choice of the parameters of the classical field, we can conditionally produce macroscopic multi-dimensional maximal entanglement for the cavity modes.

关键词： resonant interaction strongly driven atom multi-component entanglement cavity QED

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