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Treatment of coke plant wastewater by SND fixed biofilm hybrid system

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Journal of Environmental Sciences 2007年第2期19卷 153-159页

作者： QI rong YANG Kun YU zhao-xiang Department of Chemistry Tongji University Shanghai 200092 China

In this article, coke plant wastewater was treated by a simultaneous nitrifying and denitrifying （SND） fixed biofilm hybrid system. The results showed that suitable parameters of the system were important for the performance of the bio-degradation system. The chemical oxygen demand （COD） removal efficiency in this system was satisfactory, higher than 94%, and ammonia nitrogen was higher than 95%. The effluent COD concentration could meet the discharge standard, except for very few situations. The results showed that a sufficient carbon source was important for making ammonia nitrogen concentration meet the discharge standard. Then the TiN removal efficiency in this system can be brought higher than 94%. Dissolved oxygen （DO） is very important to the performance of the SND bio-degradation system, and the suitable DO is about 3.5-4.0 mg/L at the forepart of reactor. In addition, the performance of the system was almost not affected by pH value. The results show that the system is feasible to treat coke plant wastewater.

关键词： coke plant wastewater SND fixed biofilm ammonia nitrogen COD carbon source

2D DOA Estimation Algorithm with Increased Degrees of Freedom for Two Parallel Linear Arrays

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China Communications 2020年第6期17卷 101-108页

作者： sheng Liu Jing zhao School of Data Science Tongren UniversityTongren 554300China

In this paper,a two-dimensional(2 D)direction-of-arrival(DOA)estimation algorithm with increased degrees of freedom for two parallel linear arrays is *** different from the conventional two-parallel linear array,the proposed two-parallel linear array consists of two uniform linear arrays with non-equal inter-element *** method(PM)is used to obtain a special matrix which can be utilized to increase the virtual elements of one of uniform linear ***,the PM algorithm is used again to obtain automatically paired elevation and azimuth *** simulation results and complexity analysis show that the proposed method can increase the number of distinguishable signals and improve the estimation precision without increasing the computational complexity.

关键词： direction-of-arrival(DOA)estimation two parallel linear arrays PM algorithm

Gaussian mixture model based adaptive control for uncertain nonlinear systems with complex state constraints

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Chinese Journal of Aeronautics 2022年第5期35卷 361-373页

作者： Yuzhu BAI rong CHEN Yong zhao Yi WANG College of Aerospace and Engineering National University of Defense TechnologyChangsha 410073China Nanjing Research Institute of Electronics Technology Nanjing 210000China

This paper addresses an uncertain nonlinear control system problem with complex state constraints and mismatched uncertainties.A novel Gaussian Mixture Model(GMM)based adaptive PID-Nonsingular Terminal Sliding Mode Control(NTSMC)(GMM-adaptive-PID-NTSMC)method is *** is achieved by combining a GMM based adaptive potential function with a novel switching surface of ***,the stability of the closed-loop system is *** main contribution of this paper is that the GMM method is applied to obtain the analytic description of the complex bounded state constraints,ensuring that the states'constraints are not violated with GMM-based adaptive potential *** developed potential function can consider the influence of *** importantly,the GMM-adaptive-PID-NTSMC can be generalized to control a more representative class of uncertain nonlinear systems with constrained states and mismatched *** addition,the proposed controller enhances the robustness,and requires less control cost and reduces the steady state error with respect to the Artificial Potential Function based Nonsingular Terminal Sliding Mode Control(APF-NTSMC),GMM-NTSMC and *** last,numerical simulation is performed to validate the superior performance of the proposed controller.

关键词： Gaussian mixture model Nonlinear systems State constrained Terminal sliding mode control Uncertain

Research status and challenges in the manufacturing of IR conformal optics

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Defence Technology（防务技术） 2024年第10期40卷 154-172页

作者： Jianbo zhao sheng Wang Chunyu Zhang Jinhu Wang Qingliang zhao Center for Precision Engineering School of Mechatronics EngineeringHarbin Institute of TechnologyHarbin 150001China Laser Fusion Research Center China Academy of Engineering PhysicsMianyang 621900China Ultra-precision Machining Center College of Mechanical EngineeringZhejiang University of TechnologyHangzhou 310014China

The infrared conformal window is one of the most critical components in *** windows with high performance bring low aberrations,high aerodynamic performance,reliability in extreme working environments,and added value for *** the past decades,remarkable advances have been achieved in manufacturing technologies for conformal windows,where the machining accuracy approaches the nanometer level,and the surface form becomes more *** advances are critical to aircraft development,and these manufacturing technologies also have significant reference values for other directions of the ultra-precision machining *** this review,the infrared materials suitable for manufacturing conformal windows are introduced and compared with insights into their *** remarkable advances and concrete work accomplished by researchers are *** challenges in manufacturing conformal windows that should be faced in the future are discussed.

关键词： Conformal optics Window and dome Infrared material Ultra-precision grinding Polishing Measurement

Magnetic Actuated Shape-memory Helical Microswimmers with Programmable Recovery Behaviors

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Journal of Bionic Engineering 2021年第4期18卷 799-811页

作者： Fu zhao Weibin rong Lefeng Wang Lining Sun State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin150080China

Inspired by bacterial flagella in nature,magnetic helical microswimmer is an ideal model to perform complex task in a low Reynolds number *** Memory Polymers(SMPs)with desirable properties are considered as one of the most preferred options for the development of small-scale ***,fabricating and programming strategies are still ***,we report an approach to fabricate helical microswimmers based on thermoplastic SMP(polylactic acid).Melt-spun polylactic acid fibers containing magnetic particles were enwound to form helical *** shape recovery behaviors were programmed by annealing and *** forms of helical microswimmers(constant-helix-angle conical helix,constant-pitch conical helix,and straight helix)with controlled morphological parameters were *** obtained microswimmers showed 3D locomotion capability under rotating magnetic *** maximum swimming velocity of microswimmers was nearly six body lengths per second,and the near-wall swimming of conical helixes along their sharp end exhibited a smaller ***,we demonstrated programmed shape-switching processes(spring-like contraction and elongation,coiling and uncoiling)and self-repairing of the *** demonstrations of potential applications,tasks of mobile microstent,cargo delivery,and minimally invasive injection were carried *** multifunctional shape-memory microswimmers have immense potential in a variety of applications.

关键词： helical microrobot magnetic actuation Shape Memory Polymer(SMP) polylactic acid magnetic particles

Prediction of Hyperuricemia Risk Based on Medical Examination Report Analysis

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Journal of Systems Science and Systems Engineering 2020年第4期29卷 468-503页

作者： rong Hou Yongbo Xiao Yan Zhu Hongyan zhao Research Center for Contemporary Management School of Economics and ManagementTsinghua UniversityBeijing 100084China Institute of Industry Internet Tsinghua UniversityBeijing 100084China

This study hopes to contribute to disease detection by analyzing a medical examination dataset with 123,968 *** on association rules mining and related medical knowledge,6 models were constructed here to predict hyperuricemia prevalence and investigated its risk *** different models,the prediction performances of Lasso logistic regression,traditional logistic regression,and random forest are excellent,and the results can be *** logistic regression model also works well,but it is not ***'s prediction performance is relatively poor,while data dimensionality reduction can significantly improve its *** has the worst performance and its efficiency of processing high-dimensional large dataset is extremely *** risk factors of hyperuricemia mainly belongs to 4 categories,which are obesity-related factors,renal function factors,liver function factors,and myeloproliferative diseases-related *** forest,Lasso regression,and logistic regression all treat serum creatinine,BMI,triglyceride,fatty liver,and age as key predictive *** also show that serum urea,serum alanine aminotransferase,negative urobilinogen,red blood cell count,white blood cell count and the pH are significantly correlated with the risk.

关键词： Medical examination hyperuricemia machine learning risk prediction risk factors

Recovery and reuse of floc sludge for high-performance capacitors

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Frontiers of Environmental Science & Engineering 2022年第6期16卷 133-144页

作者： Di Zhang rong Hou Wenbo Wang He zhao Beijing Engineering Research Center of Process Pollution Control CAS Key Laboratory of Green Process and EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

In this paper,floc sludge was transformed into porous carbon matrix composites by acidification and KOH activation at high temperature and used as an electrode material for application in *** effects of different treatment processes on the electrochemical properties of sludge materials were *** results of electrochemical tests showed that the sludge electrode exhibited excellent energy storage performance after HNO3 acidification and KOH activation with a mass ratio of 3:1(KOH/C).The specific capacitance of the sludge electrode reached 287 F/g at a current density of 1 A/*** addition,the sludge electrode material showed excellent cycle stability(specific capacity retained at 93.4%after 5000 cycles at 5 A/g).Based on XRD,FTIR,SEM,TEM,and BET surface analysis,the morphology of sludge electrode materials can be effectively regulated by chemical *** best-performing material showed a 3D porous morphology with a large specific surface area(2588 m^(2)/g)and optimal pore size distribution,improving ion channels and charge *** to the life cycle assessment of floc sludge utilization,it reduced the resource consumption and toxicity risk by more than 90%compared with ordinary sludge disposal *** work provided a cost-effective and eco-friendly sludge reuse method and demonstrated the application potential of sludge-based materials in high-performance supercapacitors.

关键词： Floc sludge Porous carbon electrode Energy storage performance Supercapacitors

A residual-based message passing algorithm for constraint satisfaction problems

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Communications in Theoretical Physics 2022年第3期74卷 77-86页

作者： Chun-Yan zhao Yan-rong Fu Jin-Hua zhao College of Science University of Shanghai for Science and TechnologyShanghai 200093China Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum MatterSouth China Normal UniversityGuangzhou 510006China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing CenterSouth China Normal UniversityGuangzhou 510006China

Message passing algorithms,whose iterative nature captures complicated interactions among interconnected variables in complex systems and extracts information from the fixed point of iterated messages,provide a powerful toolkit in tackling hard computational tasks in optimization,inference,and learning *** the context of constraint satisfaction problems(CSPs),when a control parameter(such as constraint density)is tuned,multiple threshold phenomena emerge,signaling fundamental structural transitions in their solution *** solutions around these transition points is exceedingly challenging for algorithm design,where message passing algorithms suffer from a large message fiuctuation far from *** we introduce a residual-based updating step into message passing algorithms,in which messages with large variation between consecutive steps are given high priority in the updating *** the specific example of model RB(revised B),a typical prototype of random CSPs with growing domains,we show that our algorithm improves the convergence of message updating and increases the success probability in finding solutions around the satisfiability threshold with a low computational *** approach to message passing algorithms should be of value for exploring their power in developing algorithms to find ground-state solutions and understand the detailed structure of solution space of hard optimization problems.

关键词： constraint satisfaction problems model RB message passing algorithms residuals of messages

Neural Network State Learning Based Adaptive Terminal ILC for Tracking Iteration-varying Target Points

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International Journal of Automation and computing 2015年第3期12卷 266-272页

作者： Yu Liu rong-Hu Chi Zhong-sheng Hou School of Automation and Electronic Engineering Qingdao University of Science and Technology Advanced Control Systems Lab School of Electronics and Information Engineering Beijing Jiaotong University

Terminal iterative learning control(TILC) is developed to reduce the error between system output and a fixed desired point at the terminal end of operation interval over iterations under strictly identical initial conditions. In this work, the initial states are not required to be identical further but can be varying from iteration to iteration. In addition, the desired terminal point is not fixed any more but is allowed to change run-to-run. Consequently, a new adaptive TILC is proposed with a neural network initial state learning mechanism to achieve the learning objective over iterations. The neural network is used to approximate the effect of iteration-varying initial states on the terminal output and the neural network weights are identified iteratively along the iteration axis.A dead-zone scheme is developed such that both learning and adaptation are performed only if the terminal tracking error is outside a designated error bound. It is shown that the proposed approach is able to track run-varying terminal desired points fast with a specified tracking accuracy beyond the initial state variance.

关键词： Adaptive terminal iterative learning control neural network initial state learning iteration-varying terminal desired points ini