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Temperature and Flow Rate Control of diffusing Chamber

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World Journal of Engineering and Technology 2017年第1期5卷 58-76页

作者： Yongbo Lai Guoping Lu Zhiwei Wang School of Mechanic & Electrical Engineering Jiangsu College of Information Technology Wuxi China

The temperature and flow rate control of diffusing chamber is one of the key technologies in the production of poly-crystal silicon thin film. As there exist some modeling uncertainties and errors in the actual system, it is difficult to guarantee the chamber variable temperature conditions and the flow rate of diffusion gas being controlled within its targeted range in the rapid thermal processing (RTP). In this paper, the control applies the programmable logic controller (PLC) to configure control hardware system, proposes expert proportional integral derivative (PID) control method to regulate the gas flow rate and H∞ control strategy to attenuate chamber modeling uncertainties and disturbances, respectively, to steer the chamber rapid variable temperature very close to the expected product temperatures. Furthermore, it designs human-machine integrated user control interface (HMI) and achieves rapid and accurately control performances for user operating production. The designed control system are simulated and tested in the application, which demonstrates that the control method has strong robustness when the modeling uncertainties, errors, parameters perturbation and disturbances, the temperature and flow rate meet the requirements of precisely trajectory following.

关键词： diffusing Chamber PLC Hardware Configuring Expert PID Control H∞ Control HMI

Computational Studies on Detecting a diffusing Target in a Square Region by a Stationary or Moving Searcher

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American Journal of Operations Research 2015年第2期5卷 47-68页

作者： Hongyun Wang Hong Zhou Department of Applied Mathematics and Statistics Baskin School of Engineering University of California Santa Cruz USA Department of Applied Mathematics Naval Postgraduate School Monterey USA

In this paper, we compute the non-detection probability of a randomly moving target by a stationary or moving searcher in a square search region. We find that when the searcher is stationary, the decay rate of the non-detection probability achieves the maximum value when the searcher is fixed at the center of the square search region;when both the searcher and the target diffuse with significant diffusion coefficients, the decay rate of the non-detection probability only depends on the sum of the diffusion coefficients of the target and searcher. When the searcher moves along prescribed deterministic tracks, our study shows that the fastest decay of the non-detection probability is achieved when the searcher scans horizontally and vertically.

关键词： diffusing Target Non-Detection Probability Search Theory Optimal Search Path

Biogas charging and dissipating process and its accumulation in the Sebei gasfield,Qaidam Basin,China

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Science China Earth Sciences 2008年第S1期51卷 36-44页

作者： JIN Qiang 1,CHENG FuQi 1,2 ,SU AiGuo 3 ,ZHU GuangYou 3 ,WANG Li 1 &CAO Qian 1 1 China University of Petroleum,Dongying,Shandong 257061,China 2 Geological Institute of Shengli Oilfield,SINOPEC,Dongying,Shandong 257015,China 3 Petroleum Exploration and Development Institute,PetroChina,Beijing 100083,China China University of Petroleum Geological Institute of Shengli Oilfield SINOPEC Petroleum Exploration and Development Institute

The Sebei gasfield is the largest biogas accumulation found in China and many reservoirs and seal rocks superposed on a syndepositional anticline in *** biogas charging and dissipating process and its distribution have been a research focus for many *** authors suggest a diffusing and accumulating model for the biogas,as they find that the shallower the gas producer,the more methane in the biogas,and the lighter stable carbon isotope composition of *** on the diffusing model,diffused biogas is quantitatively estimated for each potential sandy reservoir in the gasfield,and the gas charging quantity for the sandy reservoir is also calculated by the diffused gas quantity plus gas reserve in-place.A ratio of diffusing quantity to charging quantity is postulated to describe biogas accumulating state in a sandy reservoir,if the ratio is less than 0.6,the reservoir forms a good gas-pool and high-production layer in the gasfield,which often occurs in the reservoirs deeper than 900 m;if the ratio is greater than 0.6,a few gas accumulated in the reservoir,which frequently exists in the reservoirs shallower than 900 ***,a biogas accumulation model is built up as lateral direct charging from gas source for the sands deeper than 900 m and indirect charging from lower gas-bearing sands by diffusion at depth shallower than 900 *** this charging and diffusion quantitative model,the authors conducted re-evaluation on each wildcat in the central area of the Qaidam Basin,and found many commercial biogas layers.

关键词： biogas charging and diffusing model relative dissipated quantity Qaidam Basin

Paired eye-control study of unilateral opaque bubble layer in femtosecond laser assisted laser in situ keratomileusis

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International Journal of Ophthalmology(English edition) 2019年第4期12卷 654-659页

作者： Cheng-Hua Wei Qiao-Yun Dai Li-Xin Mei Yao Ge Peng-Fei Zhang E Song Department of Ophthalmology the Second Affiliated Hospital of Soochow University Department of Ophthalmology the First Affiliated Hospital of Wannan Medical College Department of Ophthalmology Lixiang Eye Hospital of Soochow University

AIM: To investigate the predictive factors of the opaque bubble layer(OBL) compared to the fellow eye of same patients in FS200 femtosecond laser assisted laser in situ keratomileusis(FS-LASIK).METHODS: This study consisted of 60 consecutive patients(120 eyes) with unilateral OBL during FS-LASIK. Eyes were divided into OBL(the OBL eyes) and OBL-free groups(the fellow eyes) based on the occurrence of OBL. The preoperative demographic data, refraction, keratometry, corneal astigmatism, pachymetry, intraocular pressure and intraoperative data including the outlet location of gas diffusing canal were collected. Conditional logistic regression analysis was performed to find the associated factors with OBL in the two groups by determining odds ratios(OR) and 95%***: The preoperative demographic data, mean spherical errors, mean K value, suction time, intraocular pressure and central cornea thickness were not significantly different between the two groups. The outlet location of gas diffusing canal(Pdiffusing canal located at the posterior border of the corneoscleral limbus. This is probably consequent to more effectiveness of gas diffusing canal. Corneal astigmatism is also an independent protective factor for OBL formation.

关键词： opaque bubble layer femtosecond laser LASIK location of gas diffusing canal

Respiratory Disorders in Acromegalic Patients

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International Journal of Clinical Medicine 2019年第10期10卷 553-564页

作者： Valeria Mercuri Tullia Villani Denise Costa Michela Mordenti Tania D’Amico Paolo Palange Patrizia Gargiulo Department of Experimental Medicine Endocrinology-Pituitary Disease “Sapienza” University of Rome Rome Italy Department of Public Health and Infectious Diseases “Sapienza” University of Rome Rome Italy.

Purpose: To evaluate the prevalence and clinical performance of obstructive sleep apnoea syndrome (OSAS) in acromegalic patients, focusing on the possible correlation between alterations of pulmonary microcirculation and patient’s clinical and hormonal parameters. Methods: We enrolled 22 acromegalic patients with apnea hypopnea index (AHI) ≥ 5 if symptomatic, or ≥15 in the absence of sleep related symptoms. Patients underwent the following evaluations: GH and IGF-1 serum levels, arterial blood gas test, spirometry, carbon monoxide diffusing capacity (DLCO), home-based cardiorespiratory sleep and pulmonary function test. Results: The prevalence of OSAS was 66.6%. Patients with a severe form of OSAS appeared to be affected from acromegaly for more years than those with a lower severity of disease and those with acromegaly duration > 10 years had significantly higher levels of glycated hemoglobin. We observed a positive correlation between GH level at diagnosis and DLCO value, showing that acromegalic patients have an increase in static and dynamic respiratory volumes and alveolar-capillary exchange surface compared to the general population. We also observed a positive correlation between baseline serum IGF-1 level and DLCO/VA and between years of disease and DLCO/VA, showing the association of increased lung volume and increase of the exchange surface. Conclusions: The results of this study add new information on lung volume and alveolar gas exchange in acromegaly. Our findings highlight the role of SSA as therapy with positive impact on complication and comorbidities of acromegaly.

关键词： Acromegaly Obstructive Sleep Apnoea Syndrome Growth Hormone Insulin-Like Growth Factor 1 Carbon Monoxide diffusing Capacity

Laser assisted ablation for glass metallization

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Laser assisted ablation for glass metallization

中国光学学会2004年学术大会

作者： WU Dongjiang1,a, HONG Minghui b, MA Tengcaia aState Kay Lab for Material Modification by Laser, Electronic and Ion Beams, Dalian University of Technology, Dalian China 116024 bLaser Microprocessing Group, Data Storage Institute, DSI Building, 5 Engineering Drive 1, Singapore 117608

Glass is a hard transparent material with many applications in Photonics and advanced display industries. It is a high challenge to achieve crack-free glass microfabrication due to its special materia

关键词： Laser assisted ablation glass surface metallization electrode diffusing deposition

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非旋转体双散射光合成场动态散斑统计特性

衡阳师范学院学报 1992年第6期14卷 19-21页

作者：孙程远

本文研究了非旋转体双散射光合成场动态散斑统计特性,推导出空-时关联函数表达式,并从实验上证实了理论分析的正确性。

关键词： inrotating body dual diffusing light dynamic speckle space—time correlation