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工艺参数对氧-丙烷超音速火焰喷涂纳米WC-CoCr涂层组织及性能的影响

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稀有金属与硬质合金 2021年第4期49卷 15-22页

作者：张磊霍嘉翔赵坚伏利 roshan Pandey 刘德有陈小明水利部产品质量标准研究所浙江省水利水电装备表面工程技术研究重点实验室浙江杭州310012 水利部杭州机械设计研究所水利机械及其再制造技术浙江省工程实验室浙江杭州310012 尼泊尔国家科学技术院尼泊尔加德满都999098

采用氧-丙烷超音速火焰喷涂技术在ZG06Cr13Ni5Mo不锈钢基材表面制备了纳米WC-10Co4Cr涂层,研究了工艺参数对涂层组织及性能的影响。利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分别表征了涂层的物相成分和微观组织,采用维氏硬度计和金... 详细信息

采用氧-丙烷超音速火焰喷涂技术在ZG06Cr13Ni5Mo不锈钢基材表面制备了纳米WC-10Co4Cr涂层,研究了工艺参数对涂层组织及性能的影响。利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分别表征了涂层的物相成分和微观组织,采用维氏硬度计和金相分析仪分别测定了涂层显微硬度和孔隙率。在料浆冲蚀条件下测试了涂层的抗泥沙冲蚀磨损性能,并分析了纳米WC-10Co4Cr涂层的冲蚀磨损机制。结果表明:不同工艺条件下制备的纳米WC-10Co4Cr涂层的主要物相为WC、W_(2)C和非晶态CoCr,物相含量受丙烷流量的影响较大。涂层主要由多尺度的微米-纳米WC硬质颗粒和CoCr合金粘结相组成,同时含有一定的微观孔洞、缝隙等缺陷。涂层孔隙率随丙烷流量和喷涂角度的增大而降低,而随送粉速率和喷涂距离的增大先降低后提高;涂层的显微硬度随丙烷流量、送粉速率和喷涂距离的增大先提高后降低,而随喷涂角度的增大而提高。最佳喷涂工艺条件为:丙烷流量68 L/min,送粉速率45~55 g/min,喷涂距离250 mm,喷涂角度90°。纳米WC-10Co4Cr涂层抗泥沙冲蚀性能最大可达不锈钢基材的14.26倍,冲蚀磨损机制主要为交变应力下的疲劳剥落。

关键词：纳米涂层 WC-10Co4Cr 氧-丙烷超音速火焰喷涂孔隙率显微硬度泥沙冲蚀

Nanoscale Infrared Spectroscopy:Applications in Polymers

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Nanoscale Infrared Spectroscopy:Applications in Polymers

Evaluation of massive transfusion protocol practices by type of trauma at a level I trauma center

第十八届全国分子光谱学学术会议

作者： Hiromi Midorikawa Tadashi Awatani Michael Lo Kevin Kjoller roshan Shetty Jiping Ye Nissan Analytical Research Center Ltd. Anasys Instruments CaliforniaUSA

Interfacial functional groups,compositional distribution,crystalline structures,and local molecular orientation of functional polymer materials has been directly visualized by nanoscale infrared spectroscopy(nano-IR),in which an atomic force microscope(AFM)probe as infrared absorption sensor was *** image visualized hidden binder and adhesion process of multilayer barrier films of polyethylene-terephthalate/polyethylene(PET/PE),and enabled the chemical identification of phase structure of multi-component blends of polycarbonate/acrylonitrile butadiene styrene(PC/ABS)including soft polybutadiene domains as small as 40 nm.

关键词： Nano-IR AFM Interfacial functional groups Nanoscale chemical image Local molecular orientation

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Chinese Journal of Traumatology 2018年第5期21卷 261-266页

作者： roshan Givergis Swapna Munnangi Katayoun Fayaz M Fomani Anthony Boutin Luis Carlos Zapata LD George Angus Department of Emergency Medicine Nassau University Medical Center East Meadow NY USA Department of Pathology Nassau University Medical Center East Meadow NY USA Department of Surgery Nassau University Medical Center East Meadow NY USA

Purpose： To evaluate massive transfusion protocol practices by trauma type at a level I trauma center. Methods： A retrospective analysis was performed on a sample of 76 trauma patients with MTP activation between March 2010 and January 2015 at a regional trauma center. Patient demographics, transfusion practices, and clinical outcomes were compared by type of trauma sustained. Results： Penetrating trauma patients who required MTP activation were significantly younger, had lower injury severity score （ISS）, higher probability of survival （POS）, decreased mortality, and higher Glasgow Coma scale （GCS） compared to blunt trauma patients. Overall, the mortality rate was 38.16~. The most common injury sustained among blunt trauma patients was head injury （36.21~）, whereas the majority of the penetrating trauma patients sustained abdominal injuries （55.56~）. Although the admission coagulation parameters and timing of coagulopathy were not significantly different between the two groups of patients, a significantly higher proportion of penetrating trauma patients received high plasma content therapy relative to blunt trauma patients （p 〈 0.01 ）. Conclusion： Despite the use of the same MTP for all injured patients requiring massive transfusion, significant differences existed between blunt trauma patients and penetrating trauma patients. These differences in transfusion characteristics and outcomes following MTP activation underscore the complexity of implementing MTPs and warrant vigilant transfusion practices to improve outcomes in trauma patients.

关键词： Massive transfusion protoco Blunt Penetrating Trauma

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Gaining Insights into Functional Polymer Materials at 50 nm Spatial Resolution Using an AFM Probe as Infrared Absorption Sensor

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Gaining Insights into Functional Polymer Materials at 50 nm ...

Gaining Insights into Functional Polymer Materials at 50 nm Spatial Resolution Using an AFM Probe as Infrared Absorption Sensor

第十七届全国分子光谱学术报告会

作者： Hiromi Midorikawa Tadashi Awatani Michael Lo Kevin Kjoller roshan Shetty Jiping Ye Nissan Analytical Research Center Ltd.YokosukaJapan Anasys Instruments CaliforniaUSA

Interfacial functional groups,compositional distribution,crystalline structures,and local molecular orientation of functional polymer materials has been directly visualized by nanoscale infrared spectroscopy (nano-IR),in which an atomic force microscope(AFM) probe as infrared absorption sensor was ***-IR image visualized hidden binder and adhesion process of multilayer barrier films of polyethylene-terephthalate/ polyethylene(PET/PE),and enabled the chemical identification of phase structure of multi-component blends of polycarbonate/acrylonitrile butadiene styrene(PC/ABS) including soft polybutadiene domains as small as 40 nm.

关键词： Nano-IR AFM Interfacial functional groups Nanoscale chemical image Local molecular orientation

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Gaining Insights into Functional Polymer Materials at 50 nm ...

Pre-harvest fruit bagging influences fruit color and quality of apple cv. Delicious

2013年全国高分子学术论文报告会

作者： Hiromi Midorikawa Tadashi Awatani Michael Lo Kevin Kjoller roshan Shetty Jiping Ye Nissan Analytical Research Center Ltd. Anasys Instruments

＜正＞Interfacial functional groups,compositional distribution,crystalline structures,and local molecular orientation of functional polymer materials has been directly visualized by nanoscale infrared

关键词： Nano-IR AFM Interfacial functional groups Nanoscale chemical image Local molecular orientation

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Agricultural Sciences 2013年第9期4卷 443-448页

作者： Ram roshan Sharma Ram Krishna Pal Ram Asrey Vidya Ram Sagar Mast Ram Dhiman Mani Ram Rana Division of Post Harvest Technology Indian Agricultural Research Institute New Delhi India IARI Regional Research Station Katrain India National Research Centre for Pomegranate Solapur India Pomologist and Fruit Grower Baragaon Kullu India

An attempt was made to observe the effect of pre-harvest bagging with spun-bound fabric bags on color and quality of Delicious apple. Bagging was done about a month before harvesting and removed 3-day before harvesting. Bagged and non-bagged fruits were stored at 2℃ ± 1℃ and 90%-95% RH. Observations were recorded on color and fruit quality attributes such as total phenolics, AOX activity, fruit Ca contents, LOX activity, SSC and ascorbic acid contents at harvest and during storage. Our studies have revealed that bagged fruits have better color development (Hunter “a” = 52) than non-bagged fruits at harvest (Hunter “a” = 38), which declined slightly during storage. Similarly, at harvest, bagged fruits contained high amounts of Ca (5.38 mg/100g) and total phenolics (9.3 mg GAE/100gpulp) exhibited higher AOX activity (12.6 μmoles Trolox g-1), and had better SSC and ascorbic acid contents than non-bagged fruits, and there was a decline in all recorded parameters during storage. Bagged fruits exhibited lower LOX activity (1.38 μmoles min-1 g-1 FW) at harvest than non-bagged fruits (2.14 μmoles min-1 g-1 FW), indicating that non-bagged fruits were more senescent than bagged fruits. Further, LOX activity increased during storage both in bagged and non-bagged apples but increase in LOX activity was slower in bagged apples than in non-bagged apples.

关键词： Apple Fruit Bagging Color Firmness LOX Activity AOX Activity Fruit Quality

Evaluation of Patients with Severe Aortic Stenosis after TAVI with Self-Expandable vs. Balloon-Expandable Devices

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World Journal of Cardiovascular Diseases 2023年第10期13卷 633-645页

作者： Mohammad Nourizadeh Seifollah Abdi Farideh roshan Ali Najmeh Assadinia Mehdi Nourizadeh Mohammad Emami Elham Barati Amir Taha Asarian Department of Interventional Cardiology Cardiovascular Intervention Research Center Rajaiee Cardiovascular Medical and Research Center Iran University of Medical Sciences Tehran Iran Fellowship of Echocardiography Department of Cardiology Cardiovascular Research Center Dey Hospital Tehran Iran Department of Pathology Masih Shahid Beheshti University of Medical Science Tehran Iran Cardiovascular Disease Research Center Ahvaz Jundishapur University of Medical Sciences Ahvaz Iran School of Medicine Shahid Beheshti University of Medical Sciences Tehran Iran Kings Bournemouth UK

Background: The introduction of transcatheter aortic valve implantation (TAVI) for the treatment of severe aortic stenosis (SAS) has expanded the therapeutic possibilities for successfully managing SAS in cases with intermediate and high surgical risks. However, the complications and outcomes of new devices have not been studied enough. Hence, the purpose of this study is to evaluate the midterm results of the Core Valve and Evolute R self-expandable (SE) devices versus the Edwards SAPIEN balloon-expandable (BE) devices. Methods and Material: This was a quasi-experimental study conducted in Tehran, Iran, from May 2012 to June 2017. SAS patients who were not ideal candidates for surgery were randomly assigned to either SE or BE groups. For each patient, a questionnaire, including four sections comprised of Basic characteristics, echocardiographic, angiographic, and Computed Tomography (CT) scan data was filled. TAVI was followed by echocardiography a week later and after three months they were reevaluated by another questionnaire. Results: The total number of patients was 60. The mean ages of patients undergoing the procedure with SE or BE devices were 81.2 ± 8 and 79.8 ± 7, respectively. Mortality occurred in 20% of the patients (5 cases in the SE group and 7 cases in the BE);mortality causes were 66.6 % cardiac and 33% non-cardiac. Moderate to severe Paravalvular leakage in both groups did not differ significantly. The mortality rate was 5 (41.6%) in the SE group versus 7 (58.3%) in the BE group (P > 0.05). Conclusion: In conclusion, the BE group did not experience fewer paravalvular leaks in comparison with the SE. Morbidity and mortality between the BE and the SE groups did not differ significantly.

关键词： TAVI Balloon-Expandable Valves Self-Expandable Valves Mortality Aortic Stenosis

CoolClot,a novel hemostatic agent for controlling life-threatening arterial bleeding

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World Journal of Emergency Medicine 2013年第2期4卷 123-127页

作者： SMJ Mortazavi A Tavasoli M Atefi N Tanide N Radpey P roshan-shomal H Moradi S Taeb Radiology Department School of Allied Medical SciencesShiraz University of Medical SciencesShirazIran The Centre for Radiological Research Shiraz University of Medical SciencesShirazIran Shiraz Blood Transfusion Organization ShirazIran The Centre for Research on Stem Cell Shiraz University of Medical SciencesIran

BACKGROUND:Uncontrolled bleeding is the first leading cause of preventable death in the battlefield and the 2nd cause of mortality in civil *** hemorrhage control is among the interventions that drastically increase the survival rate in wound *** have previously shown that a certain mixture of bentonite and zeolite minerals can significantly decrease the bleeding in ***:In this study,nine healthy hybrid dogs were selected and after induction of anesthesia with ether,either arterial puncture by a needle or arteriotomy was performed on both groin regions of the *** control arteries(either the right or left femoral artery),only pressure by sterilized gauze was performed,while for the femoral arteries of the opposite side,our invented hemostatic agent,namely CoolClot,was topically used before applying the *** the second stage of the study,to assess the coagulation time,blood samples were collected from 10 volunteer ***:CoolClot significantly decreased the bleeding time in animals whose femoral arteries were cut or *** the human phase of the study,the mean coagulation time in control blood samples was 253.4+44.1 seconds,whereas it was 149.5+50.0,162.3±74.6 and 143.4±114.6seconds,respectively in blood samples treated with bentonite,zeolite and CoolClot(P<0.05).CONCLUSIONS:As controlling bleeding after a life-threatening arterial damage is critical for increasing the chance of survival,the results obtained in this study indicate the significant efficacy of CoolClot in shortening the bleeding *** experiments also indicate that CoolClot can significantly reduce the clotting time in human blood samples.

关键词： Bleeding Hemostatic agent CoolClot Bentonite and zeolite

Evaluation of a Newly Developed Laser Pen as a Home Care Device for Pain Reduction of Recurrent Aphthous Stomatitis (Preliminary Study)

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International Journal of Clinical Medicine 2015年第1期6卷 19-25页

作者： Maziar Mir Seyed Masoud Mojahedi Hassan Adalatkhah Jan Tunér Amir Mansour Shirani roshan Babaalipour Masoud Shabani Conservative Dentistry RWTH International Academy Aachen Germany Deputy for Research Ardebil University of Medical Sciences Ardebil Iran Private Dental Clinic Gr&aumlngesberg Sweden Oral Medicine Department Dental School of Islamic Azad University Khorasgan Iran Science Department Islamic Azad University Ardebil Iran

Objective: The aim of this survey is to evaluate the effect of a new developed laser pen as a home care device for patients’ pain reduction with recurrent aphthous stomatitis. Background data: Recurrent aphthous stomatitis (RAS) is one of the most common and painful ulcers in the oral cavity. Low Level Laser Therapy (LLLT) has been used successfully for reducing pain and healing time in comparison with corticosteroids and placebo in some studies. But these treatments are done in the clinics and it seems that there is no report of the laser treatment as a home care device up to this study. Methods: This was a prospective, randomized trial pilot study. Thirty patients with RAS were divided into three similar groups. The group one (n = 10) was treated with a diode laser, 660 nm, 40 mw, continuous wave, 1.2 J, 6 J/cm2, for five consecutive days (twice per day, 30 seconds each session). The second group (n = 10) was treated with a topical triamcinolone (adcortyl in orabase) ointment four times per day and the third group (n = 10) was treated with placebo (red light pen) the same way as Group 1. All the patients were evaluated with a Visual Analogue Scale (VAS) before and after treatment on the consecutive days. The data was analysed by one way ANOVA and PostHoc tests. Results: The results show that the laser pen and triamcinolon in orabase ointment have similar results and both have better results than placebo in the control of the recurrent aphthous stomatitis pain (p value: 0.001). Conclusion: In this clinical pilot study the laser pen as a home care device seems to be useful for the treatment of RAS.

关键词： Low Level Laser Therapy Recurrent Aphthous Stomatitis Pain Corticosteroid