Journal of Astm International最新文献_第6页

Wear Simulation of Total Disc Arthroplasties: Sensitivity to Device Design and Test Parameters 全椎间盘置换术的磨损模拟:对设备设计和测试参数的敏感性

Journal of Astm International Pub Date : 2012-05-01 DOI: 10.1520/JAI103497

P. Hyde, R. Vicars, J. Fisher, R. Hall

{"title":"Wear Simulation of Total Disc Arthroplasties: Sensitivity to Device Design and Test Parameters","authors":"P. Hyde, R. Vicars, J. Fisher, R. Hall","doi":"10.1520/JAI103497","DOIUrl":"https://doi.org/10.1520/JAI103497","url":null,"abstract":"The challenges of measuring in vivo total disc replacement (TDR) kinematics are well recognized, meaning that it is difficult to establish appropriate input conditions for wear simulation. Therefore it is desirable to ascertain the sensitivity of implant wear in vitro to perturbations of the kinematics and other testing parameters. It has previously been demonstrated in other metal-on-polyethylene joint replacements that cross-shear strongly influences wear rate. This study investigates this phenomenon by altering the phasing of the inputs by making the lag in the flexion-extension and lateral bend displacements zero. Further, the effect of an additional anterior-posterior shear, which has been reported in vivo, was investigated for two different TDR designs using an extra load or displacement input in addition to those prescribed by the standard ISO 18192-1. Altering the standard ISO 18192-1 waveform phasing significantly reduced the mean wear rate of the constrained polyethylene disc. The addition of an anterior-posterior input showed no significant change in the rate of wear for the constrained TDR but was increased for the unconstrained device. These data demonstrate the strong dependency of the wear in these types of joints to the input conditions as well as the devices design parameters. Hence, these factors should be given prime consideration when designing both the device itself and the assessment regime in which the construct is to be tested.","PeriodicalId":15057,"journal":{"name":"Journal of Astm International","volume":"19 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84246053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Boundary-Layer Flow of a Nanofluid past a Stretching Sheet under Uniform Heat and Mass Flux 纳米流体在均匀热量和质量通量下通过拉伸片的边界层流动

Journal of Astm International Pub Date : 2012-05-01 DOI: 10.1520/JAI104363

W. Khan, I. Pop

引用次数: 1

Preparation and Characterization of Surfactant Coated Ce-Zr Nanoparticles and Nanofuel 表面活性剂包覆Ce-Zr纳米颗粒及纳米燃料的制备与表征

Journal of Astm International Pub Date : 2012-05-01 DOI: 10.1520/JAI104429

R. Sharma, S. Kanagaraj

引用次数: 2

Reactor Dosimetry and RPV Life Management 反应堆剂量学和RPV寿命管理

Journal of Astm International Pub Date : 2012-05-01 DOI: 10.1520/JAI104140

S. Belousov, Krassimira Ilieva, M. Mitev

{"title":"Reactor Dosimetry and RPV Life Management","authors":"S. Belousov, Krassimira Ilieva, M. Mitev","doi":"10.1520/JAI104140","DOIUrl":"https://doi.org/10.1520/JAI104140","url":null,"abstract":"Reactor dosimetry (RD) is a tool that provides data for neutron fluence accumulated over the reactor pressure vessel (RPV) during the reactor operation. This information, however, is not sufficient for RPV lifetime assessment. The life management of RPV is a multidisciplinary task. To assess whether the RPV steel properties at the current stage (for actual accumulated neutron fluence) of reactor operation are still 'safe enough,' the dependence of material properties on the fluence must be known; this is a task for material science (MS). Moreover, the mechanical loading over the RPV during normal operation and accidence have to be known, as well, for evaluation, if the RPV material integrity in this loading condition and existing cracks is provided. The crack loading path in terms of stress intensity factor is carried out by structural analyses (SA). Pressure and temperature distribution over RPV used in these analyses are obtained from a thermal hydraulic (TH) calculation. The conjunction of RD and other disciplines in RPV integrity assessment is analyzed in accordance with the FFP (fitness for purpose) approach. It could help to improve the efficiency in multi-disciplinary tasks solutions. (authors)","PeriodicalId":15057,"journal":{"name":"Journal of Astm International","volume":"26 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85134600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Fuel quality assessment of ethyl esters produced from vegetable oils and their blends with petroleum diesel. 植物油及其与石油柴油的混合物生产的乙酯燃料质量评价。

Journal of Astm International Pub Date : 2012-05-01 DOI: 10.1520/JAI104528

G. Anastopoulos, S. Kalligeros, F. Zannikos

引用次数: 1

Vertebrectomy Model for the Mechanical Assessment of Fusionless Scoliosis Growth Rods 椎体切除模型用于无融合脊柱侧凸生长棒的力学评估

Journal of Astm International Pub Date : 2012-05-01 DOI: 10.1520/JAI103493

J. Shorez

引用次数: 0

ASTM F2624—Evaluating Alternate Fixtures for Flexion/Extention, Lateral Bending, and Axial Rotation Testing of Extra Discal Motion Preserving Implants ASTM f2624 -评估额外椎间盘运动保持植入物屈曲/伸展，侧向弯曲和轴向旋转测试的替代夹具

Journal of Astm International Pub Date : 2012-05-01 DOI: 10.1520/JAI103510

M. Anderson, D. Lissy

{"title":"ASTM F2624—Evaluating Alternate Fixtures for Flexion/Extention, Lateral Bending, and Axial Rotation Testing of Extra Discal Motion Preserving Implants","authors":"M. Anderson, D. Lissy","doi":"10.1520/JAI103510","DOIUrl":"https://doi.org/10.1520/JAI103510","url":null,"abstract":"ASTM F2624-07 prescribes applying flexion/extension (FE), lateral bending (LB), and axial rotation (AR) moments to test and evaluate extra discal motion preserving implants (EDMPI), but parameters such as fixture design and load parameters are left to the user to define. A set of fixtures to conduct FE, LB, and AR testing rotation of EDMPI devices about a fixed center of rotation were developed by Aesculap Implant Systems. Their design was shared, and a set of these fixtures were manufactured and evaluated independently at Empirical Testing Corp. Testing was conducted to quantify the loads applied to an EDMPI in the FE and LB fixtures, determine whether results are frequency dependent, and evaluate whether EDMPI of different stiffnesses can be differentiated when using the fixtures. Miniature load cells were mounted to FE and LB fixtures to quantify load applied to an EDMPI during testing at several different applied loads and at two testing frequencies (2 Hz and 5 Hz). The load cells were replaced with cylindrical test specimens made of stainless steel, titanium, polyether ether ketone (PEEK), or a polyethylene cable slipped inside a polyurethane tube and the testing repeated. Results indicated that loads measured during FE testing were similar in magnitude to those recorded during LB testing but 90 degrees out of phase. No frequency effects were observed. Differences in displacement amplitude when testing the stainless steel, titanium, and PEEK specimens in FE and LB testing at both 2 Hz and 5 Hz were not discernable. The displacement amplitude of the polyethylene (PE) cord specimen was different than the other specimens, but no frequency effect was noted. The fixtures developed by Aesculap are a reasonable attempt to conduct EDMPI testing in FE, LB, and AR motions. Potential users of these fixtures should conduct further studies to determine whether their use is appropriate to test their specific EDMPI device.","PeriodicalId":15057,"journal":{"name":"Journal of Astm International","volume":"29 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2012-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82665345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Nucleate Pool Boiling Heat Transfer Correlation for TiO2-Water Nanofluids 二氧化钛-水纳米流体的核池沸腾传热相关性研究

Journal of Astm International Pub Date : 2012-05-01 DOI: 10.1520/JAI104409

A. Suriyawong, A. S. Dalkılıç, S. Wongwises

引用次数: 14

Use of Ferrochromium Slag as an Artificial Aggregate in Pavement Layers 铬铁渣在路面层人工集料中的应用

Journal of Astm International Pub Date : 2012-04-01 DOI: 10.1520/JAI103666

A. Yilmaz, M. Karasahin

引用次数: 0

Naphthalene Sorption to Organic Additives in Cement-Treated Soils 水泥处理土壤中萘对有机添加剂的吸附

Journal of Astm International Pub Date : 2012-04-01 DOI: 10.1520/JAI104302

C. Lake, Jill Searle, Evan Bridson-Pateman

{"title":"Naphthalene Sorption to Organic Additives in Cement-Treated Soils","authors":"C. Lake, Jill Searle, Evan Bridson-Pateman","doi":"10.1520/JAI104302","DOIUrl":"https://doi.org/10.1520/JAI104302","url":null,"abstract":"Cement-based solidification/stabilization (S/S) is a widely used source-controlled treatment method for contaminated sediments. Increasingly, the technology is being used to remediate sites that contain high molecular weight organic compounds. The low level of organic content in cement-based S/S mixtures often creates a need for organic additives in the mixtures in order to improve the level of sorption in the treatment process. Very little work has been published related to the quantification of the sorption of organic contaminants to cement-based S/S mixtures and the level of improvement afforded by additives such as fly ash and organoclays. The objective of this study is to examine the sorption levels of naphthalene to several cement-treated soil mixtures with and without organic additives (i.e., fly ash and organoclay) using batch testing. It is found that the sorption values of naphthalene vary but appear to be dependent on the amount of organic carbon present in the mixture. In order to assess the potential benefit of this improved sorption for field applications, contaminant migration modeling is performed using the results obtained. It is shown that cement-based S/S remediation systems can provide long-term protection against naphthalene contaminant migration, especially cement-based S/S mixtures with organoclay additives, for the assumptions considered in the modeling.","PeriodicalId":15057,"journal":{"name":"Journal of Astm International","volume":"66 1","pages":"104302"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76962936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2