检索结果-南通市图书馆

心理学报 2007年第3期39卷 489-494页

作者： michael j. frederick Gordon G. Gallup j. University at Albany

波动不对称(FA)是压力的随机性引发双侧完美对称偏离的现象,这是个体无力免受发展中不利因素(如早期营养不良)侵害的一个标志。比较个体口腔两侧牙齿的大小是一种测量 FA 的方法。本研究汇集了 10 个物种共 296 名个体的牙齿测量结果,... 详细信息

波动不对称(FA)是压力的随机性引发双侧完美对称偏离的现象,这是个体无力免受发展中不利因素(如早期营养不良)侵害的一个标志。比较个体口腔两侧牙齿的大小是一种测量 FA 的方法。本研究汇集了 10 个物种共 296 名个体的牙齿测量结果,测量对象包括黑猩猩(学名 Pan troglodytes)、猩猩(学名Pongo pygmaeus)、大猩猩(学名 Gorilla gorilla)、智人(学名 Homo sapiens),以及许多化石人。分析发现,猩猩样本牙齿的 FA 水平要显著低于大猩猩、黑猩猩、直立人、尼安德特人和智人样本的 FA 水平。而与之相反的是,智人与尼安德特人样本的牙齿 FA 水平要显著高于其它任何一种巨猿样本的 FA 水平。该文提出了有关缓和的选择压力的解释。

关键词：波动对称选择压力化石人

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Buechel Pappas Resurfacing Shoulder Replacement: Evolution and over 40 Years of Clinical Experience

引用

Open j.urnal of Orthopedics 2024年第5期14卷 218-228页

作者： frederick F. Buechel michael j. Pappas Rutgers Nj.Medical School Newark NJ USA South Mountain Orthopaedic Associates South Orange NJ USA New j.rsey Institute of Technology Newark NJ USA

Background: Early exploration of the semi constrained “Floating-Socket” total shoulder replacement (TSR) in 1974 led to a proliferation of various unconstrained designs that allowed resection or retention of the humeral head, depending upon the pathological process involved. Degenerative glenohumeral arthritis with mild to moderate involvement of subchondral bone allowed for a resurfacing option, while severe humeral head involvement required a partial or full humeral head replacement attached to an intramedullary stem for fixation. All components evolved from cemented to cementless application by 1982. The purpose of this paper is to describe the progression of Buechel-Pappas (B-P) shoulder replacement development from the early 1970’s in both cemented and cement less applications. Methods: Clinical evaluations of “Floating-Socket” TSR, followed by B-P stem-type, resurfacing types, bipolar-type and revision components, all of which comprise the B-P Shoulder Replacement System, were performed over a 49-year period. Results: “Floating-Socket” implants improved the results of simple, constrained ball-in-socket designs, but generally failed by glenoid component loosening in both chimpanzee and human applications. Unconstrained resurfacing-type components, both anatomical humeral head and full proximal humeral components, were quite successful, with minimal failures observed in long-term studies. Bipolar salvage implants, used for severe proximal deficiencies, revisions and massive rotator cuff arthropathy, were also very successful;providing overhead range of motion in many patients. Conclusions: Resurfacing hemiarthroplasty, in patients with intact or repairable rotator cuff mechanisms, gave the most satisfactory results and were the least technically complicated to perform, requiring minimal instrumentation. Resurfacing of full proximal humeral deficiencies, using femoral resurfacing components, gave similar clinical results to more complex semi-constrained devices,

关键词： Total Shoulder Replacement Resurfacing Shoulder Replacement

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Buechel Pappas Resurfacing Shoulder Replacement: Evolution and over 40 Years of Clinical Experience

引用

Open j.urnal of Orthopedics（矫形学期刊） 2024年第5期 218页

作者： frederick F. Buechel michael j. Pappas

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Buechel-Pappas Total Ankle Replacement: Use of Highly Cross-Linked Polyethylene Meniscal Bearings over a 13 - 15 Year Interval

引用

Open j.urnal of Orthopedics 2023年第8期13卷 321-327页

作者： frederick F. Buechel michael j. Pappas Rutgers Nj.Medical School Newark USA South Mountain Orthopaedic Associates South Orange USA Mechanical Engineering NJ Institute of Technology Newark USA

Background: The Buechel-Pappas (BP) meniscal bearing total ankle replace-ment was initially developed as a “shallow-sulcus” talar component device using cobalt-chromium-molybdenum alloy, in 1978, and later, modified to a “deep-sulcus” talar component device using titanium nitride (TiN) ceramic and porous coating in 1989. Wear related osteolytic cysts were noted in the tibia and talus surrounding these devices that compromised long term fixation and stability when using standard ultra-high molecular weight polyethylene (UHMWPe) as a bearing material. This study explores the use of highly cross-linked UHMWPe (HXLPe) to minimize osteolysis by replacing standard UHMWPe with this more wear-resistant material. Methods: There were 12 primary and 8 revision total ankle replacements followed for 13 to 15 years. HXLPe was used in all meniscal bearings, either as primary or revision implants. All stable metallic tibial and talar components were retained in revision cases. Osteolytic cysts greater than 10 mm in diameter were bone grafted with homologous morselized banked bone through cortical windows in the tibia or talus. No adj.vant screw fixation was used to stabilize any metallic implant. Results: No HXLPe bearings failed in this study, and no re-revisions were performed. No primary total ankle replacement failed in this study, and there were no substantial osteolytic cysts (>2 mm) observed in primary total ankle replacements on plain X-rays. All bone grafted osteolytic cysts in revision ankle replacements remained stable, even though partial resorption of the grafted material was identified in most of the ankles. No loosening of porous coated and TiN coated tibial and talar components were seen;the longest surviving metal components in the revision group was 24 years with the revised bearing at 15 years. Conclusions: HXLPe has greatly improved wear resistance in meniscal-bearing BP total ankle replacements in both primary and revision arthroplasties. Osteolytic cysts can b

关键词： Cementless Total Ankle Replacement Meniscal Ankle Replacement Osteolysis Bone Graft of Cysts

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Why European Universities and Funding Agencies are Committing to Open Access

引用

图书情报工作 2006年第1期50卷 24-27页

作者： frederick j.Friend OSI Open Access Advocate JISC Consultant

New opportunities presented by technological developments are being realised but more can be achieved in opening access to scientific reports and data. Funding agencies and universities are beginning to realise the benefits from an open access model for the dissemination of research results. European funding agencies and universities are following two strategies towards open access, the deposit of research reports in repositories and the conversion of j.urnals to an open access business model. Various public statements have been made in support of open access, and several organizations-such as j.SC in the UK-are undertaking work to assist all stakeholders in scholarly communication in introducing beneficial changes.

关键词： open access j.SC OSI

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Semiconducting Carbon Nanotube/Fullerene Blended Heteroj.nctions for Photovoltaic Near-Infrared Photon Harvesting

引用

Nano Research 2011年第11期4卷 1174-1179页

作者： Dominick j. Bindl Adam S. Brewer michael S. Arnold 1509 University Ave. Materials Science and Engineering Dept. University of Wisconsin-Madison Madison WI 53706 USA

We demonstrate that the near-infrared （NIR） absorptivity of semiconducfing single-walled carbon nanotubes （s-SWCNTs） can be harnessed in blended heteroj.nctions with the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester （PCBM）. Photogenerated charge separation is efficiently driven by the ultrahigh interracial area of the blends and the favorable energy offsets between the two materials. NIR-sensitive photovoltaic and photodetector devices utilizing the stack （indium tin oxide/ca. 10 nm s-SWCNT：PCBM/100 nm Cj.0 nm 2,9- dimethyl-4,7-diphenyl-],10-phenanthroline （BCP）/Ag） were fabricated with NIR power conversion efficiencies 〉1.3% and peak, zero bias external quantum efficiency of 18% at λ = 1205 nm.

关键词： Carbon nanotube bulk heteroj.nction photovoltaic photodetector near-infrared (NIR)

来源：

维普期刊数据库评论