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Logical control scheme with real-time statistical learning for residual gas fraction in IC engines

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Science China(Information Sciences) 2018年第1期61卷 45-57页

作者： xun shen Yuhu WU Tielong shen Department of Engineering and Applied Sciences Sophia University School of Control Science and Engineering Dalian University of Technology

In this paper, an optimal control scheme for reducing the fluctuation of residual gas fraction(RGF) under variational operating condition is developed by combining stochastic logical system approach with statistical learning method. The method estimating RGF from measured in-cylinder pressure is introduced firstly. Then, the stochastic properties of the RGF are analyzed according to statistical data captured by conducting experiments on a test bench equipped with a L4 internal combustion engine. The influences to the probability distribution of the RGF from both control input and environment parameters are also analyzed. Based on the statistical analysis, a stochastic logical transient model is adopted for describing cyclic behavior of the RGF. Optimal control policy maps for different fixed operating conditions are calculated then. Besides, a statistical learning-based method is applied to learn the probability density function(PDF)of RGF in the real-time which is used to adjust the control MAP based on logical optimization. The whole optimal control policy map is obtained based on Gaussian process regression with consideration of statistical information of RGF. Finally, the performance of the proposed method is experimentally validated.

关键词： combustion engine statistical learning residual gas fraction variable valve timing logical control

NUMERICAL SIMULATION OF 3-D TURBULENT FLOW IN THE MULTI-INTAKES SUMP OF THE PUMP STATION

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Journal of Hydrodynamics 2007年第1期19卷 42-47页

作者： CHEN Hong-xun shen Xin-rong Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

In this article, a numerical model forthree-dimensional turbulent flow in the sump of the pumpstation was presented. A reasonable boundary condition for the flow in the sump with several water intakes at different flowrates was proposed. The finite volume method was employed tosolve the governing equations with the body fitted gridgenerated by the multi-block grid technique. By using theFluent software, the fluid flow in a model sump of the pumpstation was calculated. Compared with the experimental result,the numerical result of the example is fairly good.

关键词： pumping station sump suction pipe turbulentmodel numerical simulation

Effects of the duration of expressions on the recognition of microexpressions

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第3期13卷 221-230页

作者： xun-bing shen Qi wu Xiao-lan FU State Key Laboratory of Brain and Cognitive Science Institute of Psychology Chinese Academy of Sciences Beijing 100101 China

Objective: The purpose of this study was to investigate the effects of the duration of expressions on the recognition of microexpressions, which are closely related to deception. Methods: In two experiments, participants were briefly (from 20 to 300 ms) shown one of six basic expressions and then were asked to identify the expression. Results: The results showed that the participants' performance in recognition of microexpressions increased with the duration of the expressions, reaching a turning point at 200 ms before levelling off. The results also indicated that practice could improve the participants' performance. Conclusions: The results of this study suggest that the proper upper limit of the duration of microexpressions might be around 1/5 of a second and confirmed that the ability to recognize microexpressions can be enhanced with practice.

关键词： Duration of expressions Microexpressions Microexpression training tool (METT)

Iron ores matching analysis and optimization for iron-making system by taking energy consumption,CO2 emission or cost minimization as the objective

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Science China(Technological Sciences) 2017年第11期60卷 1625-1637页

作者： shen xun CHEN LinGen XIA ShaoJun QIN XiaoYong XIE ZhiHui Institute of Thermal Science and Power Engineering Naval University of EngineeringWuhan 430033China Military Key Laboratory for Naval Ship Power Engineering Naval University of EngineeringWuhan 430033China College of Power Engineering Naval University of EngineeringWuhan 430033China

An optimization model for iron-making system covering sinter matching process to blast furnace process is established, in which the energy consumption, CO_2 emission and cost minimizations are taken as optimization objectives. Some key constraints are considered according to practical production experience in the modelling. The combination of linear programming(LP)and nonlinear programming(NLP) methods is applied. The optimal sinter matching scheme under given conditions and the optimization results for different objectives are obtained. Effects of sinter grade and basicity on all the optimal objectives and coke ratio in blast furnace process are analyzed, respectively. The results obtained indicate that compared with the initial values,the energy consumption/CO_2 emission of iron-making system decreases by 2.03% for objectives of energy consumption/CO_2 emission minimizations and 1.89% for the objective of cost minimization, the cost decreases by 17.88% and 18.13%, *** the three criteria decrease with the increasing lump usage, coal powder injection, blast temperature, and decreasing coke ratio for the iron-making system.

关键词： iron ore matching iron-making system minimum energy consumption minimum CO2 emission minimum cost performance optimization

Primary follicular lymphoma in the renal pelvis:A rare case report

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World Journal of Clinical Cases 2021年第21期9卷 6026-6031页

作者： xun-Ze shen Chen Lin Fang Liu PET/CT Center Shaoxing People's Hospital(Shaoxing HospitalZhejiang University School of Medicine)Shaoxing 312000Zhejiang ProvinceChina Department of Pathology Shaoxing People's Hospital(Shaoxing HospitalZhejiang University School of Medicine)Shaoxing 312000Zhejiang ProvinceChina

BACKGROUND Follicular lymphoma(FL)is more common in lymph nodes,while primary extranodal lymphomas are *** tract lymphoid neoplasms are extremely rare,accounting for less than 5%of all extranodal *** one case of FL from the renal pelvis has previously been *** SUMMARY A 70-year-old male patient with a history of esophageal cancer visited our hospital for follow-up *** computed tomography revealed a malignant mass in the right renal *** whole-body positron emission tomography/computed tomography showed a significant increase in fluorodeoxyglucose uptake of this soft tissue mass and no abnormal fluorodeoxyglucose uptake in the esophageal *** patient underwent radical resection of a malignant tumor in the right kidney,which was confirmed by postoperative pathology to be *** patient received no radiation or chemotherapy after surgery,and no recurrence of lymphoma or other malignant tumors was found at the 1-year *** Extranodal FL is more common in the skin and gastrointestinal tract but rarely occurs in the urinary *** is the second report of primary renal *** extranodal FL is expected to have a favorable prognosis and can be cured by local resection.

关键词： Lymphoma Follicular lymphoma Renal pelvis Imaging Resection Case report

Regulation of the arachidonic acid-stimulated respiratory burst in neutrophils by intra-cellular and extracellular calcium

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Chinese Science Bulletin 2001年第4期46卷 314-317页

作者： Shaokun Chuai Tianhui Hu Jiang Liu xun shen Chinese Acad Sci Inst Biophys Beijing 100101 Peoples R China

The respiratory burst is an important physiological function of the neutrophils in killing the bacteria invading in human body. We used chemiluminescence method to measure the exogenous arachidonic acid-stimulated respiratory burst, and measured the cytosolic free calcium concentration in neutrophils by the fluorescence method. It was found that, on one hand, the arachidonic acid-stimulated respiratory burst was enhanced by elevating the cytosolic free calcium concentration in neutrophils with a potent endomembrane Ca2+-ATPase inhibitor, Thapsgargin; on the other hand, chelating the intracellular or extracellular calcium by EGTA or BAPTA inhibited the respiratory burst. Results showed that calcium plays an important regulatory role in the signaling pathway involved in the exogenous arachidonic acid-stimulated respiratory burst of neutrophils.

关键词： arachidonic acid neutrophils respiratory burst chemi-luminescence intracellular calcium extracellular calcium.

A Comprehensive Review of Security-constrained Unit Commitment

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Journal of Modern Power Systems and Clean Energy 2022年第3期10卷 562-576页

作者： Nan Yang Zhenqiang Dong Lei Wu Lei Zhang xun shen Daojun Chen Binxin Zhu Yikui Liu IEEE Hubei Provincial Engineering Research Center of Intelligent Energy Technology China Three Gorges UniversityYichang 443002China Electrical and Computer Engineering Stevens Institute of TechnologyHobokenNJ 07030USA Department of Mechanical Systems Engineering Tokyo University of Agriculture and TechnologyTokyo 184-8588Japan Electric Power Research Institute State Grid Hunan Electric Power Company LimitedChangsha 410007China

Security-constrained unit commitment(SCUC)has been extensively studied as a key decision-making tool to determine optimal power generation schedules in the operation of electricity *** the development of emerging power grids,fruitful research results on SCUC have been ***,it is essential to review current work and propose future directions for SCUC to meet the needs of developing power *** this paper,the basic mathematical model of the standard SCUC is summarized,and the characteristics and application scopes of common solution algorithms are *** models focusing on diverse mathematical properties are then categorized and the corresponding solving methodologies are ***,research trends in the field are prospected based on a summary of the state-of-the-art and latest *** is hoped that this paper can be a useful reference to support theoretical research and practical applications of SCUC in the future.

关键词： Security-constrained unit commitment electricity market accurate model AC power flow data-driven

Clinical and computed tomography features of adult abdominopelvic desmoplastic small round cell tumor

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World Journal of Gastroenterology 2014年第17期20卷 5157-5164页

作者： xun-Ze shen Jian-Guo Zhao Jian-Jun Wu Fang Liu Department of Radiology Shaoxing People’s Hospital Shaoxing Hospital of Zhejiang University Department of Radiotherapy Shaoxing People’s Hospital Department of Radiology Second Affiliated Hospital of Medical SchoolZhejiang University Department of Pathology Shaoxing People’s Hospital

To investigate the clinical and computed tomography(CT)features of desmoplastic small round cell tumor(DSRCT),we retrospectively analyzed the clinical presentations,treatment and outcome,as well as CT manifestations of four cases of DSRCT confirmed by surgery and *** CT manifestations of DSRCT were as follows:(1)multiple soft-tissue masses or diffuse peritoneal thickening in the abdomen and pelvis,with the dominant mass usually located in the pelvic cavity;(2)masses without an apparent organbased primary site;(3)mild to moderate homogeneous or heterogeneous enhancement in solid area on enhanced CT;and(4)secondary manifestations,such as ascites,hepatic metastases,lymphadenopathy,hydronephrosis and *** prognosis and overall survival rates were generally *** used treatment strategies including aggressive tumor resection,polychemotherapy,and radiotherapy,showed various therapeutic *** of DSRCT shows characteristic features that are helpful in *** discovery and complete resection,coupled with postoperative adjuvant chemotherapy,are important for prognosis of *** abdominopelvic rather than locoregional radiotherapy is more effective for unresectable DSRCT.

关键词： Desmoplastic small round cell tumor Peritoneum Pathology Computed tomography Clinical features

Primary histiocytic sarcoma of the stomach:A case report with imaging findings

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World Journal of Gastroenterology 2013年第3期19卷 422-425页

作者： xun-Ze shen Fang Liu Rui-Jun Ni Bo-Yin Wang Department of Radiology Shaoxing People's Hospital Shaoxing Hospital of Zhejiang University Department of Pathology Shaoxing People's Hospital

Histiocytic sarcoma(HS)is a rare malignant neoplasm that originates from a histiocytic hematopoietic lineage characterized by histiocytic differentiation and its corresponding immunophenotypic *** herein reported a case of primary HS of the stomach which was confirmed through histopathologic examination and immunohistochemical staining.A 52-year-old woman presented with progressive difficulty in feeding and dull pain in the epigastric ***,endo-scopic ultrasonography,double contrast examination, and computed tomography revealed a mass located on the posterior wall of fundus and lesser curvature of the ***,the cytoplasm of the tumor cells was abundant and ***-chemical staining revealed that the tumor cells were positive for CD45RO and *** is difficult to differentiate HS of stomach from other gastric malignancies by radiological evaluation ***,HS may be considered when a protruding and ulcerated mass in stomach shows heterogeneous hypervascular *** the best of our knowledge,this is the first report in English language literature that emphasizes the imaging findings of human gastric HS.

关键词： Histiocytic sarcoma Stomach Primary Endoscopic ultrasonography Gastroscope Double contrast examination Computed tomography