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Sawdust discharge rate from aerated hoppers

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Particuology 2011年第3期9卷 306-313页

作者： Pan Chen Zhulin Yuan chien-song chyang Fu-Xiong Zhuan School of Energy and Environment Southeast UniversityNanjing 210096JiangsuChina Department of Chemical Engineering Chung Yuan Christian UniversityChungli 32023TaiwanChina

This paper presents a numerical and experimental study of the discharge rate of sawdust from an aerated hopper as an important parameter in many industrial processes involving the handling of other granular materials. Numerical experiments are conducted by means of an Eulerian-Eulerian approach coupled with the kinetic theory of granular flow （KTGF）. Emphasis is given to the effects of particle size, hopper outlet width, hopper half angle, aeration height and air flow rate. The results show that the discharge rate is significantly affected by hopper outlet width, particle size and air flow rate, but is not sensitive to the hopper half angle and aeration height： increasing hopper outlet width or air flow rate increases discharge rate, while increasing particle size decreases discharge rate. Close agreement between numerical predictions and experimental results is obtained.

关键词： Granular flow Aeration Hopper Flow rate GranuLar kinetic theory Sawdust

Horizontal gas mixing in rectangular fluidized bed:A novel method for gas dispersion coefficients in various conditions and distributor designs

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Chinese Journal of Chemical Engineering 2017年第7期25卷 848-861页

作者： Asheesh Nautiyal chien-song chyang Pin-Wei Li Hsin-Yung Hou Department of Chemical Engineering Chung Yuan Christian UniversityTaoyuan 320TaiwanChina

In a rectangular fluidized bed combustor, the tracer gas is injected continuously into the bed from a point source at the center of the distributor plate. In this study, a general governing equation is formulated for tracer gas dispersion in the bed. An analytical solution is derived to estimate the dispersion coefficients, Dxand Dy, in a horizontal plane. The concentration profiles at different sampling heights with various gas velocities are ***, to estimate the dispersion coefficients, surface fitting of the obtained analytical solution to the experimental data is performed. The dispersion coefficients obtained from this model are compared with those of a conventional model. Additionally, the effect of walls, bed height and gas injection rate on the dispersion coefficients in a horizontal plane is investigated, and the effect of distributor design on the dispersion coefficients in a horizontal plane is investigated with different tracer positions. It is found that Dxand Dyare nearly equivalent at a lower tracer gas ratio of the injected gas to the total gas flow rate. It is also demonstrated that the effect of bed height on Dxis minor. This model is also able to estimate the dispersion coefficients in the case of a multihorizontal nozzle distributor.

关键词： Gas dispersion coefficient Horizontal mixing Wall effect Surface modeling

Incineration of kitchen waste with high nitrogen in vortexing fluidized-bed incinerator and its NO emission characteristics

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Journal of Environmental Sciences 2013年第9期25卷 1841-1846页

作者： Feng Duan chiensong chyang Jiaruei Wen Jim Tso School of Metallurgy and Resource Anhui University of Technology Department of Chemical Engineering Chung Yuan Christian University Research and Development Center for Environmental Technology Chung Yuan Christian University

Some municipal solid waste （MSW） can be used as the fuel. Combustion of MSW with high nitrogen content is successfully conducted in a lab-scale vortexing fluidized-bed incinerator （VFBI）. Pigskin with 16.5 wt.% nitrogen content was used to simulate the high nitrogen content kitchen waste, and silica sand was used as the bed material. The effects of operating conditions, such as the bed temperature, freeboard temperature, excess oxygen ratio, and static bed height on the CO and NO concentrations at the exit of combustor and cyclone were investigated. The experimental results show that the freeboard temperature is the most important factor for CO emission. The order of operating conditions impact on the NO emission is：（1） excess oxygen ratio; （2） bed temperature; （3） freeboard temperature; and （4） static bed height. Utilizing cyclone can significantly reduce the CO emission concentration when the CO concentration released from the freeboard is higher than 50 ppm. On the other hand, the cyclone has no significant effect on the NO emission. Despite having high nitrogen content, a low conversion from fuel-N to NO was attained. Compared with other types of combustors, VFBI reduces the CO and NO emission concentrations much better when burning MSW with high nitrogen content.

关键词： incineration high nitrogen content vortexing fluidized bed pollutant emission

Cigarette smoking and alcohol drinking and esophageal cancer risk in Taiwan Residents women

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World Journal of Gastroenterology 2010年第12期16卷 1518-1521页

作者： I-Chen Wu Deng-chyang Wu Hung-Ju Su Hui-Jen Tsai chien-Yu Lu Jang-Ming Lee Ming-Tsang Wu Division of Gastroenterology Department of Internal MedicineKaohsiung Medical University Hospital Faculty of Medicine College of MedicineKaohsiung Medical University Biomedical Engineering Research Laboratories Industrial Technology Research Institute Division of Hematology and Oncology Department of Internal MedicineKaohsiung Medical University Hospital Department of Surgery National Taiwan University Hospital Department of Family Medicine Kaohsiung Medical University Hospital Graduate Institute of Occupational Safety & Health Kaohsiung Medical University

AIM:To investigate the etiology of esophageal cancer among Taiwan Residents ***:This is a multi-center,hospital-based,case-control *** patients consisted of women who were newly diagnosed and pathology-proven to have esophageal squamous cell carcinoma(ESCC) from three large medical centers(one from Northern and two from Southern Taiwan,respectively)between August 2000 and December *** ESCC patient was matched with 4 healthy women based on age(within 3 years)and hospital of origin,from the Department of Preventive Medicine in each hospital.A total of 51 case patients and 204 controls,all women,were ***:Frequencies of smokers and drinkers among ESCC patients were 19.6%and 21.6%,respectively,which were significantly higher than smokers(4.4%) and drinkers(4.4%)among controls(OR=4.07,95%CI:1.36-12.16,P=0.01;OR=3.55,95%CI:1.03-12.27,P=0.04).Women who drank an amount of alcohol more than 158 g per week had a 20.58-fold greater risk(95%CI:1.72-245.62,P=0.02)of ESCC than those who never drank alcohol after adjusting for other covariates,although the sample size was ***:Cigarette smoking and alcohol drinking,especially heavy drinking,are the major risks for developing ESCC in Taiwan Residents women.

关键词： Esophageal squamous cell carcinoma Taiwan Residents women Cigarette smoking Alcohol drinking

Pollutant emission characteristics of rice husk combustion in a vortexing fluidized bed incinerator

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Journal of Environmental Sciences 2013年第2期25卷 335-339页

作者： Feng Duan chiensong chyang Yucheng Chin Jim Tso School of Metallurgy and Resource Anhui University of Technology Department of Chemical Engineering Chung Yuan Christian University R&D Center for Environmental Technology Chung Yuan Christian University

Rice husk with high volatile content was burned in a pilot scale vortexing fluidized bed incinerator. The fluidized bed incinerator was constructed of 6 mm stainless steel with 0.45 m in diameter and 5 m in height. The emission characteristics of CO, NO, and SO2 were studied. The effects of operating parameters, such as primary air flow rate, secondary air flow rate, and excess air ratio on the pollutant emissions were also investigated. The results show that a large proportion of combustion occurs at the bed surface and the freeboard zone. The SO2 concentration in the flue gas decreases with increasing excess air ratio, while the NOx concentration shows reverse trend. The flow rate of secondary air has a significant impact on the CO emission. For a fixed primary air flowrate, CO emission decreases with the secondary air flowrate. For a fixed excess air ratio, CO emission decreases with the ratio of secondary to primary air flow. The minimum CO emission of 72 ppm is attained at the operating condition of 40% excess air ratio and 0.6 partition air ratio. The NOx and SO2 concentrations in the flue gas at this condition are 159 and 36 ppm, which conform to the EPA regulation of Taiwan.

关键词： incineration rice husk vortexing fluidized bed pollutant emission

CYP2C19 polymorphism influences Helicobacter pylori eradication

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World Journal of Gastroenterology 2014年第43期20卷 16029-16036页

作者： Chao-Hung Kuo chien-Yu Lu Hsiang-Yao Shih Chung-Jung Liu Meng-Chieh Wu Huang-Ming Hu Wen-Hung Hsu Fang-Jung Yu Deng-chyang Wu Fu-Chen Kuo Division of Gastroenterology Department of Internal MedicineKaohsiung Medical University Hospital Department of Medicine Faculty of MedicineCollege of Medicine and Center for Stem Cell ResearchKaohsiung Medical University Department of Internal Medicine Kaohsiung Municipal Hsiao-Kang Hospital Graduate Institute of Public Health Kaohsiung Medical University School of Medicine College of MedicineE-Da HospitalI-Shou University

The known factors that have contributed to the decline of Helicobacter pylori (H. pylori) eradication rate include antibiotic resistance, poor compliance, high gastric acidity, high bacterial load, and cytochrome P450 2C19 (CYP2C19) polymorphism. Proton pump inhibitor (PPI) is important in the eradication regimen. The principal enzyme implicated in the metabolism of PPIs is CYP2C19. The effects of PPI depend on metabolic enzyme, cytochrome P450 enzymes, and CYP2C19 with genetic differences in the activity of this enzyme (the homozygous EM, heterozygous EM (HetEM), and poor metabolizer). The frequency of the CYP2C19 polymorphism is highly varied among different ethnic populations. The CYP2C19 genotype is a cardinal factor of H. pylori eradication in patients taking omeprazole- based or lansoprazole-based triple therapies. In contrast, the CYP2C19 polymorphism has no significant effect on the rabeprazole-based or esomeprazole-based triple therapies. The efficacy of levofloxacin-based rescue triple therapy might be also affected by the CYP2C19 polymorphism, but CYP2C19 genotypes did not show obvious impact on other levofloxacin-based rescue therapies. Choice of different PPIs and/or increasing doses of PPIs should be individualized based on the pharmacogenetics background of each patient and pharmacological profile of each drug. Other possible factors influencing gastric acid secretion (e.g., IL-1β- 511 polymorphism) would be also under consideration.

关键词： Helicobacter pylori CYP2C19 Polymorphism Eradication Rabeprazole Omeprazole Lansoprazole Pantoprazole Esomeprazole

Gastroduodenal intussusception caused by gastric gastrointestinal stromal tumor:A case report and review of the literature

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World Journal of Clinical Cases 2021年第4期9卷 838-846页

作者： Yi-Lun Hsieh Wen-Hung Hsu Ching-Chun Lee Chun-Chieh Wu Deng-chyang Wu Jeng-Yih Wu Division of Gastroenterology Department of Internal MedicineKaohsiung Medical University HospitalKaohsiung 807Taiwan Division of Colorectal Surgery Department of SurgeryKaohsiung Medical University HospitalKaohsiung 807Taiwan Department of Pathology Kaohsiung Medical University HospitalKaohsiung 807Taiwan

BACKGROUND Gastric gastrointestinal stromal tumor(GIST)is the most common etiology of gastroduodenal *** gastroduodenal intussusception caused by gastric GIST is mostly treated by surgical resection,the first case of gastroduodenal intussusception caused by gastric GIST was treated by endoscopic submucosal dissection(ESD)in Japan in *** SUMMARY An 84-year-old woman presented with symptoms of postprandial fullness with nausea and occasional vomiting for a ***,she visited a local clinic for help,where abdominal sonography revealed a space-occupying lesion around the liver,so she was referred to our hospital for further *** sonography was repeated,which revealed a mass with an alternating concentric echogenic ***(EGD)was performed under the initial impression of gastric cancer with central necrosis and showed a tortuous distortion of gastric folds down from the lesser curvature side to the duodenal bulb with stenosis of the gastric *** was barely passed through to the 2nd portion of the duodenum and a friable ulcerated mass was *** differential diagnoses were suspected,including gastroduodenal intussusception,gastric cancer invasion to the duodenum,or pancreatic cancer with adherence to the gastric antrum and *** computed tomography for further evaluation was arranged and showed gastroduodenal intussusception with a long stalk polypoid mass 5.9 cm in the duodenal *** the impression of gastroduodenal intussusception,ESD was performed at the base of the gastroduodenal intussusception;unfortunately,a gastric perforation was found after complete resection was accomplished,so gastrorrhaphy was performed for the perforation and retrieval of the huge polypoid *** gastric tumor was pathologically proved to be a *** the operation,there was no digestive disturbance and the patient was discharged uneventfully on the 10th day following the op

关键词： Gastric gastrointestinal stromal tumor Endoscopic submucosal dissection Gastro-duodenal intussusception Elderly Esophagogastroduodenoscopy Gastrointestinal obstruction Case report

Numerical Investigation of Blast-Wave Propagation in a Small Two-Medium Duct

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Numerical Investigation of Blast-Wave Propagation in a Small...

CYP2C19 polymorphism has no influence on rabeprazole-based hybrid therapy for Helicobacter pylori eradication

The 4th Across-strait Workshop on Shock Wave/Vortex Interaction

作者： Jenq-chyang Yuan Fortune Institute of Technology

In this study,a small two-medium rigid duct with blast-wave propagation is numerically investigated by a high-resolution Euler/Navier-Stokes *** solver has a featutre of treatment of the Tait equations of state for two *** of the two media was assumed to be water which was envisaged as a *** other medium was used to simulate body’s clot or *** rigid duct wall has a mass diffusion effect in addition to viscous effects.

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World Journal of Clinical Cases 2018年第12期6卷 514-520页

作者： Tsung-Jung Lin Hsi-Chang Lee Chih-Lin Lin Chung-Kwe Wang Kuan-Yang Chen Deng-chyang Wu Department of Health care and Social Work Taipei University of Marine Technology Department of Gastroenterology Taipei City Hospital Institute of Clinical Medicine National YangMing University Institute of Neuroscience National Chengchi University Division of Gastroenterology Department of Internal MedicineKaohsiung Medical University Hospital Division of Internal Medicine Kaohsiung Municipal Ta-Tung HospitalKaohsiung Medical University Center for Infectious Disease and Cancer Research Kaohsiung Medical University

AIM To evaluate the impact of cytochrome P450 2C19(CYP2C19) and interleukin-1β(IL-1β) polymorphisms on the efficacy of Helicobacter pylori(H. pylori) eradication by using rabeprazole-based hybrid *** A total of 88 H. pylori-infected patients were recruited to receive 14-d of hybrid therapy from March 2013 to May 2014. Three patients were excluded from analysis because of incomplete compliance. Either a follow-up endoscopy or 13 C-urea test was performed to determine the results of H. pylori eradication therapy. The genotypes of CYP2C19 and IL-1β were analyzed to investigate the impact on treatment effect. RESULTS The total eradication rate of H. pylori was 92.94%(79/85). According to the CYP2C19 genotypes, the rates of H. pylori eradication were 89.19% in extensive metabolizers(EM) and 95.83% in non-EM. The *** eradication rates regarding the IL-1β genotypes were 92.59% in the normal acid secretion group and 93.10% in the low acid secretion group. After multivariable logistic regression analysis, both the genotypes of CYP2C19 and IL-1β had no significant influences on the eradication rates of H. *** The CYP2C19 and IL-1β polymorphisms are not significantly independent factors of *** eradication using rabeprazole-based hybrid therapy.

关键词： Helicobacter pylori Cytochrome P450 2C19 Interleukin-1β Hybrid therapy Rabeprazole