arXiv: Medical Physics最新文献_第6页

Prévision de l'épaisseur du film passif d'un acier inoxydable 316L soumis au fretting corrosion grâce au Point Defect Model, PDM 利用点缺陷模型PDM预测316L不锈钢受烧结腐蚀的被动膜厚度

arXiv: Medical Physics Pub Date : 2013-11-28 DOI: 10.1051/matecconf/20130704001

Jean Géringer, Digby D. Macdonald, Mathew L. Taylor

{"title":"Prévision de l'épaisseur du film passif d'un acier inoxydable 316L soumis au fretting corrosion grâce au Point Defect Model, PDM","authors":"Jean Géringer, Digby D. Macdonald, Mathew L. Taylor","doi":"10.1051/matecconf/20130704001","DOIUrl":"https://doi.org/10.1051/matecconf/20130704001","url":null,"abstract":"Les implants orthopediques de hanche ont une duree de vie d'environ 15 ans. Par exemple, la tige femorale d'un tel implant peut etre realisee en acier inoxydable 316L ou 316LN. Le fretting corrosion, frottement sous petits deplacements, peut se produire pendant la marche humaine en raison des chargements repetes entre le metal de la prothese et l'os. Plusieurs investigations experimentales du fretting corrosion ont ete entreprises. Cette couche passive de quelques nanometres, a temperature ambiante, est le point clef sur lequel repose le developpement de notre civilisation, selon certains auteurs. Ce travail vise a predire les epaisseurs de cette couche passive de l'acier inoxydable soumis au fretting corrosion, avec une attention specifique sur le role des proteines. Le modele utilise est base sur le Point Defect Model, PDM (a une echelle microscopique) et une amelioration de ce modele en prenant en compte le processus de frottement sous petits debattements. L'algorithme genetique a ete utilise pour optimiser la convergence du probleme. Les resultats les plus importants sont, comme demontre avec les essais experimentaux, que l'albumine, la proteine etudiee, empeche les degradations de l'acier inoxydable aux plus faibles concentrations d'ions chlorure ; ensuite, aux plus fortes concentrations de chlorures, un temps d'incubation est necessaire pour detruire le film passif.","PeriodicalId":8462,"journal":{"name":"arXiv: Medical Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89034445","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: 0

Application of Compressive Sensing Theory for the Reconstruction of Signals in Plastic Scintillators 压缩感知理论在塑料闪烁体信号重构中的应用

arXiv: Medical Physics Pub Date : 2013-10-06 DOI: 10.5506/APhysPolBSupp.6.1121

L. Raczynski, P. Kowalski, T. Bednarski, P. Bialas, E. Czerwiński, Ł. Kapłon, A. Kochanowski, G. Korcyl, J. Kowal, T. Kozik, W. Krzemień, Marcin Molenda, Paweł Moskal, S. Nied'zwiecki, Marek Palka, M. Pawlik, Z. Rudy, P. Salabura, Neha Gupta Sharma, M. Silarski, A. Slomski, J. Smyrski, A. Strzelecki, W. Wiślicki, M. Zielinski

引用次数: 4

System Response Kernel Calculation for List-mode Reconstruction in Strip PET Detector 条带PET检测器列表模式重构系统响应核计算

arXiv: Medical Physics Pub Date : 2013-10-06 DOI: 10.5506/APhysPolBSupp.6.1027

P. Bialas, J. Kowal, A. Strzelecki, T. Bednarski, E. Czerwi'nski, L. Kaplon, A. Kochanowski, G. Korcyl, P. Kowalski, T. Kozik, W. Krzemie'n, M. Molenda, P. Moskal, S. Nied'zwiecki, M. Palka, M. Pawlik, L. Raczy'nski, Z. Rudy, P. Salabura, N. Sharma, M. Silarski, A. Slomski, J. Smyrski, W. Wi'slicki, M. Zieli'nski

引用次数: 5

APPLICATIONS OF NEUTRON ACTIVATION SPECTROSCOPY 中子活化光谱的应用

arXiv: Medical Physics Pub Date : 2013-08-16 DOI: 10.5506/APhysPolBSupp.6.1061

M. Silarski

引用次数: 5

Measurement and Analysis of Radio-frequency Radiation Exposure Level from Different Mobile Base Transceiver Stations in Ajaokuta and Environs, Nigeria 尼日利亚Ajaokuta和周边地区不同移动基站收发信台射频辐射暴露水平的测量和分析

arXiv: Medical Physics Pub Date : 2013-06-01 DOI: 10.9790/4961-0361721

P. Ushie, V. Nwankwo, Ayinmode Bolaji, O. D. Osahun

引用次数: 4

Bullet Retarding Forces in Ballistic Gelatin by Analysis of High Speed Video 弹道明胶中子弹缓速力的高速视频分析

arXiv: Medical Physics Pub Date : 2012-12-28 DOI: 10.21236/ADA576989

Steven Gaylord, R. Blair, M. Courtney, A. Courtney

{"title":"Bullet Retarding Forces in Ballistic Gelatin by Analysis of High Speed Video","authors":"Steven Gaylord, R. Blair, M. Courtney, A. Courtney","doi":"10.21236/ADA576989","DOIUrl":"https://doi.org/10.21236/ADA576989","url":null,"abstract":"Abstract : Though three distinct wounding mechanisms (permanent cavity, temporary cavity, and ballistic pressure wave) are described in the wound ballistics literature; they all have their physical origin in the retarding force between bullet and tissue as the bullet penetrates. If the bullet path is the same, larger retarding forces produce larger wounding effects and a greater probability of rapid incapacitation. By Newton's third law, the force of the bullet on the tissue is equal in magnitude and opposite in direction to the force of the tissue on the bullet. For bullets penetrating with constant mass, the retarding force on the bullet can be determined using frame by frame analysis of high speed video of the bullet penetrating a suitable tissue simulant such as calibrated 10% ballistic gelatin. Here the technique is demonstrated with 9mm NATO bullets, 32 cm long blocks of gelatin, and a high speed video camera operating at 20,000 frames per second. It is found that different 9mm NATO bullets have a wide variety of potential for wounding and rapid incapacitation. This technique also determines the energy transfer in the first 15 cm and/or first 30 cm of tissue, which are important parameters in estimating the probability of rapid incapacitation in some of the ARL/BRL models. This method predicts that some 9mm bullets have a much higher probability of rapid incapacitation than others and the rank ordering of bullet effectiveness is in agreement with other studies.","PeriodicalId":8462,"journal":{"name":"arXiv: Medical Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83274584","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: 6

Probing Brain Oxygenation Wave-forms with Near Infrared Spectroscopy (NIRS) 近红外光谱探测脑氧合波形

arXiv: Medical Physics Pub Date : 2012-04-25 DOI: 10.5772/39025

A. Gersten, Jacqueline Perle, D. Heimer, A. Raz, R. Fried

{"title":"Probing Brain Oxygenation Wave-forms with Near Infrared Spectroscopy (NIRS)","authors":"A. Gersten, Jacqueline Perle, D. Heimer, A. Raz, R. Fried","doi":"10.5772/39025","DOIUrl":"https://doi.org/10.5772/39025","url":null,"abstract":"The technique of near infrared spectroscopy (NIRS) allows to measure the oxygenation of the brain tissue. The particular problems involved in detecting regional brain oxygenation (rSO2) are discussed. The dominant chromophore (light absorber) in tissue is water. Only in the NIR light region of 650-1000 nm, the overall absorption is sufficiently low, and the NIR light can be detected across a thick layer of tissues, among them the skin, the scull and the brain. In this region, there are many absorbing light chromophores, but only three are important as far as the oxygenation is concerned. They are the hemoglobin (HbO2), the deoxy-hemoglobin (Hb) and cytochrome oxidase (CtOx). The devices that were used in our experiments were : Somanetics INVOS Brain Oximeter (IBO) and Toomim's HEG spectrophotometer. The performances of both devices were compared including their merits and drawbacks. The IBO use for research has two drawbacks: the sampling rate is too small and the readings are limited to only two significant digits. The HEG device does not have these drawbacks, but is not developed sufficiently at this time to measure rSO2. We have measured the HEG readings and compared them with the rSO2 readings of the IBO. Results of an experiment are presented whose aim is to explore the relationship between respiration and cerebral oxygenation. Measurements of end tidal CO2 (EtCO2) were taken simultaneously with cerebral oxygen saturation (rSO2) using the INVOS Cerebral Oximeter of Somanetics. Due to the device limitations we could explore only subjects who could perform with a breathing rate of around 2/min or less. The results of all subjects clearly show a periodic change of cerebral oxygenation with the same period as the breathing exercises.","PeriodicalId":8462,"journal":{"name":"arXiv: Medical Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81070916","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: 5

Structural optimisation: biomechanics of the femur 结构优化:股骨的生物力学

arXiv: Medical Physics Pub Date : 2011-10-06 DOI: 10.1680/eacm.10.00032

A. Phillips

引用次数: 25

The role of electron capture and energy exchange of positively charged particles passing through matter 正电荷粒子通过物质时的电子捕获和能量交换作用

arXiv: Medical Physics Pub Date : 2011-09-12 DOI: 10.5923/J.JNPP.20120204.01

W. Ulmer

引用次数: 6

Study on radon and radium concentrations in drinking water in west region of Iran 伊朗西部地区饮用水中氡和镭浓度的研究

arXiv: Medical Physics Pub Date : 2011-06-01 DOI: 10.3923/AJ.2011.310.312

G. Forozani, Ghasem. Soori

引用次数: 4