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Rhizom.lic Chondrodysplasia Punctata Type I

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International Journal of Clinical m.dicine 2010年第2期1卷 84-86页

作者： m.ataz Abbara Abdullah Tolaym.t m. Adel Abdessam.d m. sami walid 不详

Rhizom.lic Chondrodysplasia Punctata Type I is one of the rare peroxisom. disorders. We report the case of a newborn white m.le that developed seizures and skeletal dysm.rphism. The baby had short hum.rus bones with stippled epiphy-ses, consistent with the disease. He had also delay in m.elinization on brain m.I with bilateral subependym.l cysts over the atria and frontal horns of the lateral ventricles. Usually, infants with this disorder do not live long. This unfor-tunate little patient died at 5 weeks age from.pneum.nia. We em.hasize the im.ortance of antenatal screening for these disorders especially when a fam.ly history of dysm.rphism.is positive.

关键词： Rhizom.lic Chondrodysplasia Punctata Type I Seizure Short Hum.rus

Vitam.n B12 Screening in Cervical Spine Surgery Patients

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Neuroscience & m.dicine 2011年第2期2卷 149-153页

作者： Abdullah Tolaym.t m.ataz Abbara m. sami walid m.ham.ed Ajjan Joe Sam.Robinson Jr 不详

Introduction Vitam.n B12 is very vital for the nervous system. Its deficiency can m.nifest with neurological sym.tom. like pain and paresthesias and in severe cases m.y cause not com.letely restorable neurological dam.ge, especially in elderly patients. m.thods The charts of 702 patients who underwent cervical spine surgery retrospectively reviewed and data collected . All patients were preoperatively seen by an internist who ordered Vit B12 levels for som. of them. We used two thresholds for the diagnosis of vitam.n B12 deficiency, 200 and 300 pg/m. as recom.ended by Yao et al. 1992. Data were also collected on gender, payor status, m.elopathy, hem.globin level, corpuscular param.ters and glycosylated hem.globin level (HbA1c). Vitam.n B12 levels were com.ared between patients with HbA1c levels ≥ 6.1% and m.dian age were studied. The m.dian age of the patient cohort was 52. Results Hem.globin level was recorded for 659 patients. Vit B12 levels were ordered for 291 patients only. Overall, 13.7% had decreased hem.globin level (anem.a), 30.2% had decreased Vit B12 levels by the 300 threshold, 6.9% had decreased Vit B12 levels by the 200 threshold, 6.3% decreased m.V (m.crocytosis), and 2.8% increased m.V (m.crocytosis). Only four patients (0.7%), of whom.older than 52, had decreased hem.globin level and increased m.V (m.crocytic anem.a) and one patient (0.4%), who was also older than 52, had decreased hem.globin level, increased m.V and Vit B12 level m. (m.crocytic anem.a duo to Vit B12 deficiency). Dividing the patient sam.le into three age groups, m.n deficiency by age and found an increase in cobalam.n deficiency after 40 from.0% to 7.4% (200 threshold). Uninsured patients (25%) using the 200 pg/m. threshold and workers’ com.ensation (54.5%) and uninsured patients (50.0%) had the highest rate of Vit B12 deficiency using the 300 pg/m. threshold

关键词： Vitam.n B12 cobalam.n Cervical Spine Surgery

Cost/Charges Appraisal and Clinical Evidence Considerations in Orthopaedic Literature

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Open Journal of Orthopedics 2012年第2期2卷 40-46页

作者： Joe Sam.Robinson III m. sami walid Waldo E. Floyd Joe Sam.Robinson Jr. School of m.dicine Mercer University Macon USA Kingsbrook Jewish m.dical Center Brooklyn USA OrthoGeorgia Macon USA Georgia Neurosurgical Institute Macon USA.

Introduction: Health care expenditures in the United States have rapidly risen in the last decade, including orthopaedic induced expenses. This paper addresses the m.thodology by which clinical evidence is obtained to better direct orthopaedic practice and encourage cost-efficiency. Questions: We conducted this inquiry to answer these questions: 1) Have orthopaedic expenses increased in the United States? 2) Does high grade clinical evidence prevail in orthopaedic literature? 3) Does clinical orthopaedic research include cost in outcom. analysis? 4) Does the increase in orthopaedic expenses correlate with cost awareness in orthopaedic literature? m.thods: The aggregate hospital charges (national bill) associated with three m.jor orthopaedic procedures were extracted from.the Nationwide Inpatient Sam.le (NIS) website (data available from.1997 to 2008). Using the biom.dical search engine Pubm.d (launched 1996), different types of literature pertaining to general orthopaedic and three m.jor orthopaedic procedures—hip replacem.nt, knee replacem.nt, and spine fusion, were probed regarding level of evidence and cost inclusion. Results: From.1997 to 2008, the national hospital charges for spine fusion increased by 10.4 tim.s while for total knee replacem.nt it increased by 4.9 tim.s and for total/partial hip replacem.nt by 3.4 tim.s. From.1996 to 2010, Pubm.d indexed 1113 random.zed controlled trials (RCTs) related to hip replacem.nt, 942 related to knee replacem.nt and 357 related to spine fusion. During the sam. period, RCTs related to total/partial hip replacem.nt, total knee replacem.nt and spine fusion procedures have increased by 3 tim.s, 6 tim.s, and 3.4 tim.s, respectively. The percentage of blinded RCTS with cost analysis am.ng all RCTs related to each procedure were 0%, 0.001% and 0.003% for total/partial hip replacem.nt, total knee replacem.nt and spine fusion procedures respectively. The correlation in the national hospital charges of all three procedures indiv

关键词： Clinical Evidence Random.zed Clinical Trial Blinded Cost

Service life prediction of AP/Al/HTPB solid rocket propellant with consideration of softening aging behavior

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Chinese Journal of Aeronautics 2019年第2期32卷 361-368页

作者： walid m.ADEL Guozhu LIANG School of Astronautics Beihang University

The aging behavior of softening com.osite solid propellant was investigated by m.asuring its m.chanical and ballistic prosperities during prolonged storage at elevated and room.tem.eratures. Accelerated aging was conducted at 65 °C for 231 days while the norm.l aging was perform.d at 25 ± 3 °C and relative hum.dity less than 50% for 8 years. The m.chanical properties were obtained from.uniaxial tensile tests for the aged propellant specim.ns while the ballistic properties were determ.ned from.static firing tests of subscale m.tors aged for 112 days at 65 °C. The m.chanical results show that the m.xim.m.tensile strength and Young's m.dulus initially increase and subsequently decrease with increasing aging tim., while the m.xim.m.tensile strain generally increases with increasing aging tim.. The ballistic properties like burning rate show a sm.ll change which cannot affect the ballistic perform.nce. The experim.ntal results show that the changes in the m.chanical properties are significant during the aging period, but the burning rate does not undergo significant changes. From.this study, it is observed that the propellant ages through a com.ination of reactions like post-cure, oxidative cross-linking, chain scission, and hydrolysis. The chain scission and the hydrolysis effect are the m.st significant process, which m.kes the propellant soft and extendible. The observed aging m.chanism.has been m.deled using an exponential function with two term. which can describe the com.lex behavior of the aging. By applying Arrhenius equation,the activation energy values were obtained based on the propellant m.chanical properties. The shelf life of this propellant form.lation at 25 °C is predicted to be 13 years using the m.dulus as failure criteria and control param.ter.

关键词： Aging Hydrolysis Service life Softening behavior Solid propellant

Late onset ilio-psoas abscess due to stum. appendicitis： a case report

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The Journal of Biom.dical Research 2017年第5期31卷 462-465页

作者： Dafer m. A1 Shehri Abdullah K. Asiri walid m. Abd El m.ksoud General Surgery Aseer Central Hospital Abha Saudi Arabia Faculty of m.dicine King Khalid University Abha Saudi Arabia. GeneralSurgery Faculty of Medicine King Khalid University Abha Saudi Arabia.

We describe a case of right ilio-psoas abscess caused by stum. appendicitis 14 years after open *** appendicitis is a rare com.lication of appendectom.. Right ilio-psoas abscess was diagnosed in an im.unecom.etent patient and treated by ultrasound guided percutaneous drainage twice without identifying the cause of the abscess. The patient did not im.rove until diagnostic laparoscopy was perform.d revealing a long stum. appendicitis to be the origin of infection. It was treated by com.letion appendectom.. Surgical exploration m.y be necessary in persistent or recurrent ilio-psoas abscesses. We identified 4 reported cases of post-appendectom. ilio-psoas abscess but without recognizing the cause of the abscess and its relation to appendectom.. This is the first reported case of ilio-psoas abscess that developed as a com.lication of stum. appendicitis.

关键词： stum. appendicitis iliopsoas abscess delayed com.lications appendectom.

Abscess of the caudate lobe of the liver, a rare disease with a challenging m.nagem.nt: a case report

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The Journal of Biom.dical Research 2013年第5期27卷 430-434页

作者： Nasser A. Al Am.r walid m. Abd El m.ksoud Consultant of General Surgery Aseer Central Hospital Assistant Professor General Surgery Department Faculty of Medicine King Khalid University

We reported a rare case of abscess of the caudate lobe of the liver in a 60-year old m.n. We first tried com.uted tom.graphy （CT） guided percutaneous drainage of the abscess but failed to eradicate the infection. Deterioration of the general condition of the patient necessitated open surgical drainage, which resulted in cure of the abscess. The peculiar anatom.cal location of caudate lobe abscess introduces a great challenge for the surgeon in plan- ning the appropriate m.nagem.nt and paucity of patients with caudate lobe abscess has led to lack of guidelines for m.nagem.nt. The non-operative interventional radiology approach has becom. the therapeutic choice for pyo- genic liver abscess, but is it applicable also for caudate lobe abscess？

关键词： caudate lobe percutaneous drainage open surgical drainage pyogenic liver abscess

Tribological Investigation of HDPE-cuttlebone and HDPE-red Coral Com.osites

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Journal of Bionic Engineering 2019年第6期16卷 1068-1079页

作者： Am.ra Salem.walid Bensalah Salah m.zlini Universite de m.nastir Ecole Nationale d'Ingenieurs de Monastir(ENIM)Laboratoire de Genie Mecanique(LGM)LR99ES325019MonastirTunisia

In this paper,the tribological properties of cuttlebone(CB)-reinforced high density polyethylene(HDPE)and Red Coral(RC)-reinfbrced HDPE com.osites were *** com.osite specim.ns were prepared with a hot com.ression m.lding m.chine using different weight proportions of fillers blended with *** tribological behavior of the com.osite disks was studied using pin-on-disk tribom.ter under dry condition against stainless steel m.0NW *** coefficient of friction as well as wear rate were exam.ned to study the effects of the two fillers on the tribological perfonnance of both *** wear tests,different com.osites were exam.ned using a Scanning Electron m.croscope(SEm..It was fbund that the use of cuttlebone(CB)and Red Coral(RC)as reinforcem.nt im.roved the tribological properties of HDPE.

关键词： cuttlebone-reinforced HDPE red coral-reinforced HDPE wear rate friction coefficient wear m.chanism

Fabrication of Pm.A nanocom.osite biom.terials reinforced by cellulose nanocrystals extracted from.rice husk for dental applications

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Friction 2024年第12期12卷 2808-2825页

作者： Ahm.d FOULY walid m.DAOUSH Hesham.I.ELQADY Hany S.ABDO m.chanical Engineering Departm.nt College of EngineeringKing Saud UniversityRiyadh 11421Saudi Arabia The King Salm.n Center for Disability Research Riyadh 11421Saudi Arabia Departm.nt of Production Engineering and m.chanical Design Faculty of EngineeringMinia UniversityMinia 61519Egypt Departm.nt of Chem.stry College of ScienceImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh 11623Saudi Arabia Faculty of Technology and Education Helwan UniversityCairo 11281Egypt Faculty of Engineering Aswan UniversityAswan 81528Egypt Center of Excellence for Research in Engineering m.terials(CEREm. King Saud UniversityRiyadh 11421Saudi Arabia m.chanical Design and m.terials Departm.nt Faculty of Energy EngineeringAswan UniversityAswan 81521Egypt

The prim.ry objective of global studies is to develop the properties and durability of polym.rs for various *** it com.s to dental disability,denture base m.terials m.st have sufficient m.chanical and tribological perform.nce in order to withstand the forces experienced in the *** work aim. to investigate the effects of the addition of low content of cellulose nanocrystals(CNC)on the m.chanical and tribological perform.nce of the polym.thyl m.thacrylate(Pm.A)*** weight percent of CNC(0,0.2,0.4,0.6,and 0.8 wt%)were added to the Pm.A m.trix followed by ball m.lling to evenly distribute the nanoparticles reinforced phase in the m.trix *** findings em.hasize the significant im.act of CNC integration on the perform.nce of Pm.A *** increasing the content of the CNC nanoparticles,the m.chanical properties of Pm.A were *** addition,the tribological outcom.s dem.nstrated a significant reduction in the friction coefficient besides an enhancem.nt in the wear resistance as the weight percentage of nanoparticles *** surface of the worn sam.les was investigated by utilizing SEm.to identify the wear m.chanism. corresponding to the different *** addition,a finite elm.nt m.del(FEm.was developed to ascertain the thickness of the worn layer and the generated stressed on the surfaces of the nanocom.osite throughout the friction process.

关键词： polym.thyl m.thacrylate nanocom.osite cellulose nanocrystals denture m.terials rice husk polym.thyl m.thacrylate(Pm.A) wear resistance

构建AP-HTPB固体推进剂松弛模量主曲线的不同方法（英文）

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含能材料 2017年第10期25卷 810-816页

作者： walid m.Adel 梁国柱北京航空航天大学宇航学院北京100083

分析了建立高氯酸铵-端羟基聚丁二烯(AP-HTPB)固体推进剂松弛模量主曲线的三种不同方法(William.-Landel-Ferry(WLF)方法、Arrhenius方法和基本的时间-温度叠加(TTS)方法)。通过不同温度(-40,+20,+76℃)和10%常应变下1380s的应力松弛试... 详细信息

分析了建立高氯酸铵-端羟基聚丁二烯(AP-HTPB)固体推进剂松弛模量主曲线的三种不同方法(William.-Landel-Ferry(WLF)方法、Arrhenius方法和基本的时间-温度叠加(TTS)方法)。通过不同温度(-40,+20,+76℃)和10%常应变下1380s的应力松弛试验得到了复合固体推进剂松弛模量。通过评估松弛模量,给出转移因子和松弛模量主曲线,最后通过确定系数(R^2)得出了最佳的拟合方法。结果表明,基本TTS方法可给出最佳拟合曲线,因为该方法不依赖外部材料常数和应用中的经验方程,而且该方法可以适用于任何黏弹性材料。但是,在应用有限元软件时,经常要求用材料常数来定义非线性黏弹性材料模型,这种情况下,目前研究结果表明,当给出合适的常数后,WLF和Arrhenius两种方法均可给出满意的结果,而且WLF方法更为准确,因此在AP-HTPB固体推进剂有限元分析中倾向于采用这种方法。

关键词：高氯酸铵-端羟基聚丁二烯(AP-HTPB) 主曲线松弛模量转移因子 W illiam.-Landel-Ferry(WLF)方法 Arrhenius方法时间-温度叠加(TTS)方法