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膜片式液压微位移执行器设计与特性分析

液压与气动 2024年第9期48卷 18-24页

作者：贺伟国凯孙杰山东大学高效洁净机械制造教育部重点实验室山东济南250061 山东大学机械工程学院山东济南250061

微位移执行器是实现高精度控制的关键装置,广泛应用于精密伺服系统、芯片生产以及超精密加工领域。针对传统微位移执行器结构复杂、输出力小、行程短等问题,提出基于帕斯卡原理的膜片式液压微位移执行器。首先,建立了复合载荷下执行器... 详细信息

微位移执行器是实现高精度控制的关键装置,广泛应用于精密伺服系统、芯片生产以及超精密加工领域。针对传统微位移执行器结构复杂、输出力小、行程短等问题,提出基于帕斯卡原理的膜片式液压微位移执行器。首先,建立了复合载荷下执行器的力学模型,并采用逐次修正法推导了应力-应变的迭代求解式。其次,研究了执行器关键参数对执行器行程和应力的影响规律。在此基础上,建立了以材料强度和设计行程为约束的膜片式液压执行器的优化设计流程。最后,通过有限元仿真验证了执行器的驱动压力-位移特性、行程及负载能力。结果表明,执行器表现出良好的驱动压力-位移线性关系,此外其40μm/mm的伸长率远优于压电陶瓷。在4 MPa的驱动压力下,执行器可实现1 mm的行程,并提供最大10790 N的输出力,即使在外负载为5395 N时仍能保持0.5 mm的行程。

关键词：微位移膜片式液压执行器

Study of cerium-promoted rhodium alumina catalyst as a steam reforming catalyst for treatment of spent solvents

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Journal of Rare Earths 2014年第9期32卷 831-836页

作者： Hee-Chul yang Min-Woo Lee Ho-Sang Hwang jei-Kwon Moon Dong-Yong Chung Korea Atomic Energy Research Institute

This study attempted to develop an appropriate catalyst used for the steam reforming of gasified spent solvents. Rh2O3/ CeOE-Al2O3 catalysts with various CeO2 loadings were prepared and heated at different temperatures of 500 and 800 ℃, and their surface properties were studied using X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, transmission electron microscopy （TEM）, temperature programmed reduction （TPR） and Bmmauer-Emmett-Teller （BET） analyses. Rhodium existed in the form of Rh2O3, regardless of the sample composition as well as the heating temperature. In the tested range of cerium addition （up to 12 times the rhodium mass）, no significant changes in BET surface areas and binding energy corresponding to Rh 3d5/2 were observed. Instead, the addition of cerium led to a greatly enhanced dispersion of rhodium nanoparticles, and no agglomeration of rhodium was observed for samples heated even at 800 ℃. Honeycomb monolith rhodium catalysts promoted with cerium were fabricated and tested for the steam reforming of a gasified spent solvent, mainly consisting of butylene （C4H8）. The test results suggested that a cerium-promoted rhodium catalyst could be used as an appropriate reforming catalyst for treating low-quality non-methane hydrocarbons without the formation of coke at high temperatures of up to 900 ℃.

关键词： cerium rhodium catalyst steam reforming spent resin rare earths

碳基纳米零价铁复合材料的合成与应用研究进展

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化工新型材料 2024年第9期52卷 18-25,30页

作者：孙福祺李建亮丁杰何岸飞苏州科技大学环境科学与工程学院苏州215009 招商局生态环保科技有限公司重庆400067

由活性炭、生物质炭、石墨烯、碳纳米管和介孔碳等碳基材料作为纳米零价铁(nZVI)载体的环境功能复合材料具有高孔隙率、大比表面积、强吸附性和还原性等特点,被广泛应用于有机污染物和重金属的去除。综述了液相还原共沉淀、碳热还原、... 详细信息

由活性炭、生物质炭、石墨烯、碳纳米管和介孔碳等碳基材料作为纳米零价铁(nZVI)载体的环境功能复合材料具有高孔隙率、大比表面积、强吸附性和还原性等特点,被广泛应用于有机污染物和重金属的去除。综述了液相还原共沉淀、碳热还原、水热碳化和机械化学等碳基纳米零价铁复合材料(C@nZVI)的合成和表征方法。通过总结C@nZVI的主要应用对象和处理性能,归纳了各种C@nZVI的结构、特性和去除污染物的机理。C@nZVI不仅应用于水中有机污染物和重金属污染物的去除,还用于贵金属回收、电化学催化以及脱氮除磷生物反应器等新领域。目前,在C@nZVI合成方法的优化、C@nZVI的回收与利用,以及C@nZVI应用于复合污染修复等方向的研究仍需完善。总结归纳了C@nZVI合成与应用的最新进展,为C@nZVI的进一步研究和应用提供了最新信息。

关键词：碳基材料纳米零价铁环境功能复合材料有机污染物重金属

Do different bariatric surgical procedures influence plasma levels of matrix metalloproteinase-2,-7,and-9 among patients with type 2 diabetes mellitus?

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World Journal of Diabetes 2020年第6期11卷 252-260页

作者： wen-Chi Wu Wei-jei Lee Tzong-His Lee Shu-Chun Chen Chih-Yen Chen Department of Medicine Taipei Veterans General HospitalTaipei 11217Taiwan Department of Surgery Min-Sheng General HospitalTaoyuan 330Taiwan Taiwan Society for Metabolic and Bariatric Surgery Taipei 11031Taiwan Division of Gastroenterology and Hepatology Department of Internal MedicineFar Eastern Memorial HospitalNew Taipei City 220Taiwan Department of Nursing Chang-Gung Institute of TechnologyGuishanTaoyuan 333Taiwan Division of Gastroenterology and Hepatology Department of MedicineTaipei Veterans General HospitalTaipei 11217Taiwan Faculty of Medicine and Institute of Emergency and Critical Medicine National Yang-Ming University School of MedicineTaipei 11221Taiwan Association for the Study of Small Intestinal Diseases GuishanTaoyuan 33305Taiwan Chinese Taipei Society for the Study of Obesity Taipei 110Taiwan

BACKGROUND Bariatric surgery is an efficient strategy for body weight and type 2 diabetes mellitus(T2 DM) management. Abnormal lipid deposition in visceral organs,especially the pancreas and liver, might cause beta-cell dysfunction and insulin resistance. Extracellular matrix(ECM) remodeling allows adipose expansion, and matrix metalloproteinases(MMPs) play essential roles in ECM ***-2 and MMP-9 are the substrates of MMP-7. Different studies have reported that MMP-2,-7, and-9 increase in patients with obesity and metabolic syndromes or T2 DM and are considered biomarkers in obesity and hyperglycemia *** prospectively investigate whether MMP-2, MMP-7, and MMP-9 differ after two bariatric surgeries: Gastric bypass(GB) and sleeve gastrectomy(SG).METHODS We performed GB in 23 and SG in 19 obese patients with T2 DM. We measured body weight, waist circumference, body mass index(BMI), and serum concentrations of total cholesterol, triglycerides, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, fasting blood sugar(FBS),hemoglobin A1 c(Hb A1 c), C-peptide, homeostasis model assessments of insulin resistance, and MMP-2, MMP-7, and MMP-9 levels at baseline and at 3, 12, and 24 mo *** Twenty-three patients aged 44.7 ± 9.7 years underwent GB, and 19 patients aged40.1 ± 9.1 years underwent SG. In the GB group, BMI decreased from 30.3 ± 3.4 to24.4 ± 2.4 kg/m2, Hb A1 c decreased from 9.2% ± 1.5% to 6.7% ± 1.4%, and FBS decreased from 171.6 ± 65.0 mg/d L to 117.7 ± 37.5 mg/d L 2 years post-operation(P < 0.001). However, the MMP-2, MMP-7, and MMP-9 levels pre-and post-GB were similar even 2 years post-operation(P = 0.107, 0.258, and 0.466,respectively). The SG group revealed similar results: BMI decreased from 36.2 ±5.1 to 26.9 ± 4.7 kg/m2, Hb A1 c decreased from 7.9% ± 1.7% to 5.8% ± 0.6%, and FBS decreased from 138.3 ± 55.6 mg/d L to 95.1 ± 3.1 mg/d L(P < 0.001). The serum MMP-2,-7, and-9 levels pre-and post-SG we

关键词： Matrix metalloproteinases Extracellular matrix Obesity Type 2 diabetes mellitus Gastric bypass Sleeve gastrectomy

Recent advances in bariatric/metabolic surgery:appraisal of clinical evidence

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The Journal of Biomedical Research 2015年第2期29卷 98-104页

作者： Wei-jei Lee Abdullah Almulaifi Department of Surgery Min-Sheng General HospitalNational Taiwan University

Obesity and associated type 2 diabetes mellitus（T2DM） are becoming a serious medical issue *** surgery has been shown to be the most effective and durable therapy for the treatment of morbid obese *** data indicates bariatric surgery as metabolic surgery is an effective and novel therapy for not well controlled obese T2 DM *** review of recent developments in bariatric/metabolic surgery covers 4major fields.1） Improvement of safety：recent advances in laparoscopic/metabolic surgery has made this minimal invasive surgery more than ten times safer than a decade *** safety profile of laparoscopic/metabolic surgery is compatible with that of laparoscopic cholecystectomy now.2） New bariatric/metabolic surgery：laparoscopic sleeve gastrectomy（LSG） is becoming the leading bariatric surgery because of its simplicity and *** new procedures,such as gastric plication,banded plication,single anastomosis（mini） gastric bypass and Duodeno-jejunal bypass with sleeve gastrectomy have all been accepted as treatment modalities for bariatric/metabolic surgery.3）Mechanism of bariatric/metabolic surgery：Restriction is the most important mechanism for bariatric *** regain after bariatric surgery is usually associated with loss of *** studies demonstrated that gut hormone,microbiota and bile acid changes after bariatric surgery may play an important role in durable weight loss as well as in T2 DM ***,weight loss is still the cornerstone of T2 DM remission after metabolic surgery.4） Patient selection：patients who may benefit most from bariatric surgery was found to be patients with insulin *** Asian T2 DM patients,the indication of metabolic surgery has been set to those with not well2controlled（Hb A1 c.7.5%） disease and with their BMI.27.5 Kg/m.A novel diabetes surgical score,ABCD score,is a simple system for predicting the success of surgical therapy for T2 DM.

关键词： bariatric surgery metabolic surgery type 2 diabetes mellitus advances

High Oil-absorptive Composites Prepared from Non-woven Fiber and Sponges with 4-tert- butylstyrene-EPDM-divinylbenzene Graft Polymer

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Journal of Donghua University(English Edition) 2001年第1期18卷 6-10页

作者：周美华 Cho Won-jei Environment Science and Engineering College Dong Hua University Shanghai 200051 Department of Polymer Science and Engineering Pusan National University Pusan 609 - 735 South Korea

4-tert-butylstyrene-EPDM-divinylbenzene graft terpolymer (PBED) was prepared by graft cross-polymerization in toluene using BPO as an initiator. The gel-PBED and solPBED were isolated from extraction of tetrahydrofuran (THF), and then they were identified by IR spectroscopy. The maximum oil-absorptivity of gel-PBED produced from the optinum reaction conditions was 8 420% but its swelling rate was very low. The highest oil-absorptivity of photocrosslinked sol-PBED film was 5 800%. Although its oil absorbency was not as high as gel-PBED' s, swelling rate was higher than that of gelPBED and was suitable for commercial purpose. After swelling in oil, neither gel PBED nor photocrosslinked sol-PBED film having high oil-absorptivity had sufficient mechanical strength to be taken out of oil wholly. As is known, composite technique is one of the useful methods for reinforcing them. Fibers, sponges and non-woven cloths were used as reinforcers or supporters in this work. Oil-absorptivities and swelling kinetics were evaluated by method ASTM (F726 - 81 ) and an experimental equation. The mechanical properties and the morphologies of some composites were measured by tensile tester and SEM , respectively.

关键词： 4-tert-butylstyrene-EPDM-divinylbenzene graft terpolymer (PBED), fiber, non-woven cloth, sponge, oilabsorptive composite.

Gastrointestinal metabolic surgery for the treatment of type 2 diabetes mellitus

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World Journal of Gastroenterology 2014年第39期20卷 14315-14328页

作者： Eng-Hong Pok Wei-jei Lee Division of Upper GI Surgery Department of Surgery University Malaya Medical Center University of Malaya Kuala Lumpur 50603 Malaysia Department of Surgery Min-Sheng General Hospital National Taiwan University

Medical therapy for type 2 diabetes mellitus is ineffective in the long term due to the progressive nature of the disease, which requires increasing medication doses and polypharmacy. Conversely, bariatric surgery has emerged as a cost-effective strategy for obese diabetic individuals; it has low complication rates and results in durable weight loss, glycemic control and improvements in the quality of life, obesity-related co-morbidity and overall survival. The finding that glucose homeostasis can be achieved with a weight loss-independent mechanism immediately after bariatric surgery, especially gastric bypass, has led to the paradigm of metabolic surgery. However, the primary focus of metabolic surgery is the alteration of the physio-anatomy of the gastrointestinal tract to achieve glycemic control, metabolic control and cardio-metabolic risk reduction. To date, metabolic surgery is still not well defined, as it is used most frequently for less obese patients with poorly controlled diabetes. The mechanism of glycemic control is still incompletely understood. Published research findings on metabolic surgery are promising, but many aspects still need to be defined. This paper examines the proposed mechanism of diabetes remission, the efficacy of different types of metabolic procedures, the durability of glucose control, and the risks and complications associated with this procedure. We propose a tailored approach for the selection of the ideal metabolic procedure for different groups of patients, considering the indications and prognostic factors for diabetes remission.

关键词： Metabolic surgery Gastrointestinal surgery Type-2 diabetes mellitus Glucolipotoxicity Efficacy Prognostic factor

Oil Gels Based on Styrene Butadiene Rubber

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Journal of Donghua University(English Edition) 2004年第1期21卷 51-56页

作者：周美华徐静波 Won-jei CHO Environmental Science and Engineering College Donghua University Shanghai 200051 College of Electronic and Electrical Engineering Shanghai University of Science and Technology Shanghai 200336 Department of Polymer Science and Engineering Pusan National University Pusan 609-735 South Koreaour oil absorbents based on styrene butadiene (SBR) i.e. pure SBR (PS) 4. tert-butylstyrene-SBR (PBS) EPDM-SBR network (PES) and 4.tert-butylstyrene-EPDMSBR (PBES) were produced from crosslinking polymerization of uncured styrene butadiene rubber (SBR) 4-tert-butylstyrene (tBS) and ethylene-propylenc-diene terpolymer (EPDM). The reaction took place in toluene using benzoyl peroxide (BPO) as an initiator. Uncured SBR was used as both a pre-polymer and a crosslink agent in this work and the crosslinked polymer was identified by IR spectroscopy. The oil absorbency of the crosslinked polymer was evaluated with the method ASTM (F726-81). The order of maximum oil absorbency was PBES>PBS>PES>PS. The maximum values of oil absorbency of PBES and PBS were 74.0g/g and 69.5g/g respectively. Gel fractions and swelling kinetic constants however had the opposite sequences. The swelling kinetic constant of PS evaluated by an experimental equation was 49. 97×10~(-2)h~(-1).

Four oil absorbents based on styrene butadiene (SBR), i.e., pure SBR (PS), 4. tert-butylstyrene-SBR (PBS), EPDM-SBR network (PES) and ***-butylstyrene-EPDMSBR (PBES), were produced from crosslinking polymerization of uncured styrene butadiene rubber (SBR), 4-tert-butylstyrene (tBS) and ethylene-propylenc-diene terpolymer (EPDM). The reaction took place in toluene using benzoyl peroxide (BPO) as an initiator. Uncured SBR was used as both a pre-polymer and a crosslink agent in this work, and the crosslinked polymer was identified by IR spectroscopy. The oil absorbency of the crosslinked polymer was evaluated with the method ASTM (F726-81). The order of maximum oil absorbency was PBES>PBS>PES>PS. The maximum values of oil absorbency of PBES and PBS were 74.0g/g and 69.5g/g, respectively. Gel fractions and swelling kinetic constants, however, had the opposite sequences. The swelling kinetic constant of PS evaluated by an experimental equation was 49. 97×10^(-2)h^(-1).

关键词： oil gel styrene butadiene rubber swelling kinetic constant

Changes in symptom patterns and health-related quality of life of cancer patients before and after chemotherapy

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Journal of Traditional Chinese Medicine 2016年第3期36卷 326-331页

作者： Chung Hsueh-wen Chien Li-Yin Huang Sheng-Miauh Tai Chen-Jeng Tai Chen-jei Department of Nursing National Yang-Ming University Institute of Community Health Care National Yang-Ming University Department of Nursing Mackay Medical College Division of Hematology and Oncology Department of Internal Medicine Taipei Medical University Hospital Department of Internal Medicine School of Medicine College of Medicine Taipei Medical University Department of Traditional Chinese Medicine Taipei Medical University Hospital Department of OB/GYN School of Medicine College of Medicine Taipei Medical University

OBJECTIVE: Symptom patterns are an important diagnostic concept in terms of Traditional Chinese Medicine. Although symptom patterns and healthrelated quality of life(HRQOL) are common diagnostic measures for cancer patients, the association between them has not been studied. This study aimed to describe the changes in the pattern of symptoms of yang-deficiency, Yin-deficiency, blood stasis, and HRQOL before and after chemotherapy,and to examine the association between the patterns and the cancer patients' ***: A panel study was undertaken with 123 cancer patients who were about to begin their first course of chemotherapy at four teaching hospitals in Taiwan. A structured questionnaire was used before and after chemotherapy. HRQOL was assessed using the Medical Outcomes Survey Short-Form 36. The Traditional Chinese Medical Constitutional Scale was used to measure yang-deficiency, Yin-deficiency, and blood stasis patterns,with higher scores indicating a larger ***: The patients had significantly worse scores for yang-deficient pattern, Yin-deficiency pattern, blood stasis pattern, and the physical components of HRQOL after chemotherapy compared with before chemotherapy. The HRQOL scores correlated significantly with yang-deficiency, Yin-deficiency, and the blood stasis pattern scores. A generalized estimating equation model showed that the HRQOL scores were significantly worse after chemotherapy compared with before chemotherapy for the physical component, but not for the mental component. Blood stasis pattern was significantly associated with a decreased HRQOL in both the physical and mental components. A hemoglobin level yang-deficiency, Yin-deficiency,and blood stasis patterns were all associated with lower HRQOLincancerpatientsafterchemotherapy.

关键词： Quality of life Symptom pattern Drug therapy Neoplasms Medicine Chinese traditional