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Frontiers of Information Technology & Electronic Engineering 2018年第11期19卷 1340-1351页

作者： Ke-yong HU Wen-juan Li Li-dong WANG Shi-hua cao Fang-ming ZHU Zhou-xiang SHOU Qianjiang College Hangzhou Normal University MOE Key Laboratory of Special Purpose Equipment and Advanced Manufacturing Technology Zhejiang University of Technology School of Information Science and Engineering Hangzhou Normal University

To reduce the computation complexity of the optimization algorithm used in energy management of a multi-microgrid system, an energy optimization management method based on model predictive control is presented. The idea of decomposition and coordination is adopted to achieve the balance between power supply and user demand, and the power supply cost is minimized by coordinating surplus energy in the multi-microgrid system. The energy management model and energy optimization problem are established according to the power flow characteristics of microgrids. A dual decomposition approach is imposed to decompose the optimization problem into two parts, and a distributed predictive control algorithm based on global optimization is introduced to achieve the optimal solution by iteration and coordination. The proposed method has been verified by simulation, and simulation results show that the proposed method provides the demanded energy to consumers in real time, and improves renewable energy efficiency. In addition, the proposed algorithm has been compared with the particle swarm optimization(PSO) algorithm. The results show that compared with PSO, the proposed method has better performance, faster convergence, and significantly higher efficiency.

关键词： Microgrids Energy management Predictive control Renewable energy Controllable energy

Event-triggered model-free adaptive control for a class of surface vessels with time-delay and external disturbance via state observer

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Journal of Systems Engineering and Electronics 2023年第3期34卷 783-797页

作者： CHEN hua SHEN Chao huaNG Jiahui cao Yuhan College of Science Hohai UniversityNanjing 210098China College of Mechanical and Electrical Engineering Hohai UniversityChangzhou 213022China Hohai-Lille College Hohai UniversityNanjing 211100China

This paper provides an improved model-free adaptive control(IMFAC)strategy for solving the surface vessel trajectory tracking issue with time delay and restricted ***,the original nonlinear time-delay system is transformed into a structure consisting of an unknown residual term and a parameter term with control inputs using a local compact form dynamic linearization(local-CFDL).To take advantage of the resulting structure,use a discrete-time extended state observer(DESO)to estimate the unknown residual ***,according to the study,the inclusion of a time delay has no effect on the linearization structure,and an improved control approach is provided,in which DESO is used to adjust for ***,a DESO-based event-triggered model-free adaptive control(ET-DESO-MFAC)is established by designing event-triggered conditions to assure Lyapunov *** when the system’s indicator fulfills the provided event-triggered condition will the control input signal be updated;otherwise,the control input will stay the same as it is at the last trigger moment.A coordinate compensation approach is developed to reduce the steady-state inaccuracy of trajectory ***,simulation experiments are used to assess the effectiveness of the proposed technique for trajectory tracking.

关键词： surface vessels event-triggered condition(ETC) discrete-time extended state observer(DESO) model-free adaptive control(MFAC) coordinate compensation

Endoscopic clipping for the secondary prophylaxis of bleeding gastric varices in a patient with cirrhosis:A case report

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World Journal of Clinical Cases 2022年第4期10卷 1447-1453页

作者： Guang-Chao Yang Ya-Xian Mo Wei-hua Zhang Li-Bin Zhou Xu-ming huang Li-ming cao Department of Gastroenterology Shenzhen Shiyan People's HospitalShenzhen 518000Guangdong ProvinceChina Department of Internal Medicine Shenzhen University The First Affiliated HospitalShenzhen 518000Guangdong ProvinceChina

BACKGROUND Bleeding from gastroesophageal varices(GOV)is a serious complication in patients with liver cirrhosis,carrying a very high mortality *** secondary prophylaxis against initial and recurrent bleeding,endoscopic therapy is a critical *** variceal clipping for secondary prophylaxis in adult GOV has not been *** SUMMARY A 66-year-old man with cirrhosis was admitted to our hospital complaining of asthenia and hematochezia for 1 *** hemoglobin level and red blood cell counts were significantly decreased,and his fecal occult blood test was *** enhanced computed tomography of the abdomen showed *** patient was diagnosed with hepatitis B cirrhosis-related GOV bleeding.A series of palliative treatments were administered,resulting in significant clinical ***,an endoscopic examination revealed severe gastric fundal varices,prompting endoscopic variceal *** were no further episodes of gastrointestinal *** GOV improved significantly on follow-up imaging and was confirmed as improved on endoscopy at the 5th post-operative *** Our results suggest that endoscopic clipping is an inexpensive,safe,easy,effective,and tolerable method for the secondary prophylaxis of bleeding from gastric type 2 ***,additional research is indicated to confirm its longterm safety and efficacy.

关键词： Endoscopy Metal clips Gastric varices Endoscopic variceal clipping Secondary prophylaxis Case report

Octreotide-induced acute life-threatening gallstones after vicarious contrast medium excretion:A case report

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World Journal of Clinical Cases 2021年第25期9卷 7484-7489页

作者： Zong-Hong Han Zhong-ming He Wen-hua Chen cao-Ye Wang Qi Wang Department of Interventional Radiology The First People’s Hospital of ChangzhouChangzhou 213003Jiangsu ProvinceChina

BACKGROUND Octreotide is widely used for the treatment of acromegaly,neuroendocrine tumors,and secretory ***,long-term octreotide treatment can increase the incidence of *** contrast medium excretion(VCME)through the hepatobiliary system is well ***,few studies have reported octreotide-induced acute gallstones following *** SUMMARY A 69-year-old man presented with left lower back pain and hematuria caused by a *** patient had a history of polycystic kidney *** occurred following renal artery embolization for a ruptured polycystic *** 5 d of treatment with octreotide,the patient developed acute gallstones and intrahepatic cholestasis which further induced pancreatitis and *** was discharged after hemodialysis,antibiotics,and supportive *** For patients with a high-risk of VCME,octreotide should be cautiously administered and carefully monitored.

关键词： Octreotide Gallstones Contrast medium Case report

Study on fault induced rock bursts

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Journal of China University of Mining and Technology 2008年第3期18卷 321-326页

作者： LI Zhi-hua DOU Lin-ming LU Cai-ping MU Zong-long cao An-ye School of Mines China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China State Key Laboratory of Coal Resource and Mine Safety China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

In order to study the rules of rock bursts caused by faults by means of mechanical analysis of a roof rock-mass balanced structure and numerical simulation about fault slip destabilization, the effect of coal mining operation on fault plane stresses and slip displacement were studied. The results indicate that the slip displacement sharply increases due to the decrease of normal stress and the increase of shear stress at the fault plane when the working face advances from the footwall to the fault itself, which may induce a fault rock burst. However, this slip displacement will be very small due to the increase of normal stress and the decrease of shear stress when the working face advances from the hanging wall to the fault itself, which results in a very small risk of a fault rock burst.

关键词： fault slip destabilization rock burst numerical simulation normal stress shear stress

Fabrication of high nitrogen austenitic stainless steels with excellent mechanical and pitting corrosion properties

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International Journal of Minerals,Metallurgy and Materials 2009年第4期16卷 387-392页

作者： hua-bing Li Zhou-hua Jiang Yang cao Zu-rui Zhang School of Materials and Metallurgy Northeastern University Shenyang 110004 China

A series of high nitrogen austenitic stainless steels were successfully developed with a pressurized electroslag remelting furnace. Nitride additives and deoxidizer were packed into the stainless steel pipes, and then the stainless steel pipes were welded on the surface of an electrode with low nitrogen content to prepare a compound electrode. Using Si3N4 as a nitrogen alloying source, the silicon contents in the ingots were prone to be out of the specification range, the electric current fluctuated greatly and the surface qualities of the ingots were poor. The surface qualities of the ingots were improved with FeCrN as a nitrogen alloying source. The sound and compact macrostructure ingot with the maximum nitrogen content of 1.21wt% can be obtained. The 18Cr18Mn2Mo0.9N high nitrogen austenitic stainless steel exhibits high strength and good ductility at room temperature. The steel shows typical ductile-brittle transition behavior and excellent pitting corrosion resistance properties.

关键词： high nitrogen austenitic stainless steels electroslag remelting nitrogen alloying ductile-brittle transition pitting corrosion resistance

Stability of Functional Equations in Several Variables

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Acta Mathematica Sinica,English Series 2007年第2期23卷 321-326页

作者： Deng hua ZHANG huai Xin cao College of Mathematics and Information Science Shaanxi Normal University

We prove a generalization of Hyers＇ theorem on the stability of approximately additive mapping and a generalization of Badora＇s theorem on an approximate ring homomorphism. We also obtain a more general stability theorem, which gives the stability theorems on Jordan and Lie homomorphisms. The proofs of the theorems given in this paper follow essentially the D. H. Hyers-Th. M. Rassias approach to the stability of functional equations connected with S. M. Ulam＇s problem.

关键词： stability functional equation, Jordan homomorphism, Lie homomorphism

Remarks on the Number of Rational Points on a Class of Hypersurfaces over Finite Fields

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Algebra Colloquium 2018年第3期25卷 533-540页

作者： hua huang Wei Gao Wei cao Department of Mathematics Ningbo University Ningbo Zhejiang 315211 China

Let Fq be the finite field of q elements and f be a nonzero polynomial over Fq. For each b ∈ Fq, let Nq（f = b） denote the number of Fq-rational points on the affine hypersurface f = b. We obtain the formula of Nq（f= b） for a class of hypersurfaces over Fq by using the greatest invariant factors of degree matrices under certain cases, which generalizes the previously known results. We also give another simple direct proof to the known results.

关键词： finite field polynomial rational point degree matrix

Toeplitz Operators with BMO Symbols of Several Complex Variables

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Acta Mathematica Sinica,English Series 2012年第3期28卷 599-608页

作者： Zhong hua HE Guang Fu cao School of Mathematics and Information Sciences Guangzhou University

In this note we prove that the boundedness and compactness of the Toeplitz operator on the Bergman space L2a （Bn） for several complex variables with a BMO1 symbol is completely determined by the boundary behavior of... 详细信息

关键词： Toeplitz operator Bergman space Berezin transform