检索结果-南通市图书馆

Cluster decay half-lives using asymmetry dependent densities

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2022年第4期46卷 131-140页

作者： V.Dehghani S.A.Alavi r.razavi A.Soylu F.Koyuncu Department of Physics University of Sistan and BaluchestanZahedanIran Physics Department Faculty of ScienceImam Hossein Comprehensive UniversityTehranIran Department of Physics Nigdeomer Halisdemir UniversityNigde 51240Turkey Program of Opticianry Golhisar Vocational School of Health ServicesBurdur Mehmet Akif Ersoy University15400GolhisarBurdurTurkey

By adopting different neutron and proton density distributions,cluster decay half-lives were investigated using double-folding potentials with constant and nuclear asymmetry dependent sets of nuclear density *** adopted asymmetry dependent sets of parameters were fitted based on microscopic calculations,and they were calculated based on the neutron skin/halo-type nuclei assumption and by employing experimental rms charge radii.A bulk agreement between theory and experiment was obtained for all sets of parameters using a calculated cluster preformation *** differences were observed between the skin and halo-type ***,the notable role of the asymmetry parameter was observed in the relatively large differences between the skin and skintype with zero thickness.

关键词： cluster decay double-folding charge radii density

Functional nasal surgery in the office-based setting

在线全文

学校读者我要写书评

暂无评论

World Journal of Otorhinolaryngology-Head and Neck Surgery 2023年第3期9卷 236-241页

作者： Alia J.Mowery Christopher r.razavi Department of Otolaryngology Johns Hopkins MedicineBaltimoreMarylandUSA Department of Otolaryngology School of MedicineOregon Health&Science UniversityPortlandOregonUSA

Objective:Nasal obstruction is a very common problem often addressed by functional nasal ***,these procedures are being performed in the office setting secondary to decreased down time,cost,and obviation of general *** goal with this review is to discuss how to appropriately select patients for office-based procedures,what procedures may be considered,and current outcomes with in-office functional nasal *** Sources:PubMed,Scopus,Google ***:research databases were searched for articles discussing techniques for performing functional nasal surgery in an office setting,and outcomes of various in-office functional nasal ***:Studies found and included in this review discuss many aspects of office-based functional nasal surgery,including practical points on patient selection and office set-up,what procedures can safely be performed,and outcomes of different techniques to address specific ***,procedures amenable to performance in the office address the internal and external nasal valves,the nasal septum,and the inferior ***:A wide range of techniques to aaddress the nasal valves,septum,and inferior turbinates can be performed in a safe and effective manner without the need for an operative suite.

关键词： nasal obstruction nasal surgical procedures office surgery reconstructive surgery

The role of surgeon-performed ultrasound in transoral endoscopic thyroidectomy vestibular approach(TOETVA)

在线全文

学校读者我要写书评

暂无评论

World Journal of Otorhinolaryngology-Head and Neck Surgery 2020年第3期6卷 150-154页

作者： Christopher r.razavi Mohammad Shaear Angkoon Anuwong Jonathon O.russell Department of Otolaryngology-Head&Nwck Surgery John Hopkins HospitalBaltimoreMDUSA b Minimally Invasive and Endocrine Surgery Division Department of Surgery Police General Hospital BangkokThailand

Transoral Endoscopic Thyroidectomy Vestibular Approach(TOETVA)is a recently described surgical technique where the thyroid and central neck can be accessed without a cutaneous *** date nearly 700 cases have been described within the English literature demonstrating the feasibility,safety,and efficacy of the *** more institutions begin to adopt the surgical approach,it is important that surgeons pay close attention to appropriate patient selection and surgical optimization to prevent experience-related complications.A valuable tool to facilitate these considerations is the utilization of surgeon-performed ultrasonography(US).While the merits of surgeon-performed US are well-documented within head&neck endocrine surgery as a whole,its value may be of even greater importance when implementing a novel surgical technique such as *** we highlight and summarize the role of surgeon-performed US within head&neck endocrine surgery,focusing on how it may influence patient selection and surgical planning with TOETVA.

关键词： Transoral thyroidectomy remote-access thyroidectomy Surgeon-performed ultrasound

Imaging and choosing the right patients for transoral endoscopic parathyroidectomy vestibular approach

在线全文

学校读者我要写书评

暂无评论

World Journal of Otorhinolaryngology-Head and Neck Surgery 2020年第3期6卷 155-160页

作者： rohit ranganath Mohammad Shaear Christopher r.razavi Pia Pace-Asciak Jonathon O.russell ralph P.Tufano Department of General Surgery Louisiana State University Health Sciences CenterShreveportLAUSA Division of Head and Neck Endocrine Surgery Deportment of Otolaryngology-Head and Neck SurgeryJohns Hopkins University School of MedicineBaltimoreMDUSA Department of Surgery Faculty of MedicineUniversity of British ColumbiaVancouverBCCanada

Advances in imaging for preoperative localization have propelled the widespread adoption of minimally invasive/focused parathyroidectomy in primary *** it is performed through a relatively small incision,studies have shown that the presence of a neck scar increases attentional bias towards the neck resulting in compromised quality of *** endoscopic parathyroidectomy vestibular approach(TOEPVA)eliminates a neck *** indications for TOEPVA are the same as that of minimally invasive open parathyroidectomy,confident preoperative localization of the parathyroid with a surgeon performed ultrasound along with concordant localization with SPECT CT is an essential prerequisite before offering patients this approach for *** data has demonstrated the feasibility and safety of this approach.

关键词： Primary hyperparathyroidism Parathyroid adenoma Hypercalcemia Transoral endoscopic parathyroidectomy vestibular approach

Introduction to office-based procedures in facial plastic&reconstructive surgery

在线全文

学校读者我要写书评

暂无评论

World Journal of Otorhinolaryngology-Head and Neck Surgery 2023年第3期9卷 199-199页

作者： Christopher r.razavi Tom Wang Division of Facial Plastic&reconstructive Surgery Department of Otolaryngology-Head&Neck SurgeryIcahn School of Medicine at Mount SinaiNew YorkNew YorkUSA Division of Facial Plastic&reconstructive Surgery Department of Otolaryngology-Head&Neck SurgeryOregon Health&Science UniversityPortlandOregonUSA

In-office interventions are becoming increasingly desired by patients,secondary to the decreased cost and downtime when compared to procedures performed in the operating *** is particularly evident in Facial Plastic&reconstructive Surgery(FPrS),where facility and anesthesia fees can make nonfunctional procedures *** special issue aims to inform readers on how to best equip their office to safely and effectively offer these services,while providing an overview of the types of procedures that can be wellsuited for the office-based setting.

关键词： Surgery anesthesia office

不同体型同卵双胞胎人群中获得性肥胖对冠状动脉血管壁延迟强化的影响

在线全文

学校读者我要写书评

暂无评论

国际医学放射学杂志 2018年第1期 112-112页

作者： M.r.Makowski C.H.P.Jansen U.Ebersberger T.Schaeffter r.razavi M.Mangino 于静 Division of Imaging Sciences and Biomedical Engineering King’s College London

摘要目的旨在探讨在同卵双胞胎中,体质量指数(BMI)对冠状动脉壁钆对比剂延迟强化的影响。冠状动脉钆对比剂延迟强化是检出和定量冠状动脉壁粥样硬化性病变

关键词：冠状动脉血管同卵双胞胎延迟强化

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

3D双时相全心MrI的心脏容积定量分析

国际医学放射学杂志 2008年第5期31卷 406-406页

作者： S.Uribe T.Tangchaoren V.Parish I.Wolf r.razavi G.Greil 郭雪梅 Division of Imaging Sciences King’s College LondonBHF Centre London SE1 7EH England.

本研究经地区伦理委员会批准并取得所有志愿者及病人的知情同意。本研究目的是在一次自由呼吸MrI检查时，采用收缩末期和舒张末期的3D全心Mr数据评价心室容积。5位健康志愿者和10例病人在MrI检查时采集了3D双时相心脏数据、屏气短轴位... 详细信息

本研究经地区伦理委员会批准并取得所有志愿者及病人的知情同意。本研究目的是在一次自由呼吸MrI检查时，采用收缩末期和舒张末期的3D全心Mr数据评价心室容积。5位健康志愿者和10例病人在MrI检查时采集了3D双时相心脏数据、屏气短轴位多层影像和大血管层面间流动影像。在这些数据中，用统计学分析比较了收缩、收缩末期和舒张末期的左室（LV）和右室（rV）容积。结果表明，屏气多层影像方式、流动测量方式和新的双时相3D方式均可得到有可比性的心脏容积和功能结果。这些方法之间进行比较时．相关系数高于0．95，且收缩、收缩末期和舒张末期的左室（LV）和右室（rV）容积之间均无显著性差异。

关键词： MrI检查心脏容积定量分析时相收缩末期健康志愿者舒张末期伦理委员会

Effect of ECAP consolidation temperature on the microstructure and mechanical properties of Al-Cu-Ti metallic glass reinforced aluminum matrix composite

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2017年第9期33卷 1031-1038页

作者： M.r.rezaei S.G.Shabestari S.H.razavi School of Metallurgy and Materials Engineering Iran University of Science and Technology (IUST) Center of Excellence for High Strength Alloys Technology (CEHSAT) School of Metallurgy and Materials EngineeringIran University of Science and Technology (IUST)

Al;Cu;Ti;metallic glass（AMG） reinforced Al matrix composites were consolidated by equal channel angular pressing（ECAP） process. The effects of ECAP consolidation temperature ranging from room temperature to just below the first crystallization temperature of metallic glass on the consolidation of composites were investigated in terms of the relative densities, structural evolutions and mechanical properties of composites. Some intermetallic compounds included Al;CuTi;, Al;Ti and Al;Cu;precipitated from metallic glass particles at consolidation temperature of 300?C. Consolidation temperature did not affect the matrix grains size of the composite. Quantitative analysis revealed that the distribution of reinforcing particles was considerably dependent on consolidation temperature. Density of the composite was increased by increasing the consolidation temperature to 250?C. The composite consolidated at250?C through ECAP process, exhibited the best combination of yield strength and ductility of 184 MPa and 48%, respectively.

关键词： Al matrix composite(AMC) Equal channel angular pressing(ECAP) Consolidation temperature Glass particles

Numerical and Performance Analysis of one row Transonic rotor with Sweep and Lean angle

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2014年第5期23卷 438-445页

作者： Seyed reza razavi Masoud Boroom Aerospace Engineering Department AmirKabir University of Technology

In this study,aerodynamic behaviors of swept and leaned blades were *** and tangential blade curvatures impacts on compressor's operating parameters were analyzed separately.A commercial CFD program which solves the reynolds-averaged Navier-Stokes equations was used to find out the mentioned impact and the complicated flow field of transonic *** CFD method that was used for solving flow field's equation was validated by experimental data of NASA rotor *** results showed that the compressor with curved rotors had higher efficiency,rotor pressure ratio and stable operating range compared to the compressor with un-curved *** curved rotors mostly had higher impact on the overall stable operating range compared to the other operating *** range involves choking point and stall point that were changed separately by using of bended *** finding the detailed impact of sweep and lean angle on transonic blades,various forms of lean and sweep angles were exerted to basic *** was found that sweep angles increased overall operating range up to 30%,efficiency up to 2%and pressure ratio up to 1%.Leaning the blades increased the safe operating range,the pressure ratio and efficiency by 14%,4%and 2%respectively.

关键词： compressor performance efficiency stable operational range surge improvement swept rotor leaned rotor