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在美国阿肯色州地化勘探中应用水系沉积物元素的富集指数寻找碳酸盐岩及铀

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国外铀金地质 1990年第2期6卷 69-72页

作者： sadeghi A Steele K.F 李学军

在美国阿肯色州中部3275km^2的面积中采集了335个水系沉积物样品(直径<75×10^(-3)mm),在这一不同地质条件的地区内用来评价化探方法寻找碳酸盐岩和铀的可能性。该区近二分之一的面积位于 Ouachita 山脉。而另一部分则位于墨西哥湾沿岸... 详细信息

在美国阿肯色州中部3275km^2的面积中采集了335个水系沉积物样品(直径<75×10^(-3)mm),在这一不同地质条件的地区内用来评价化探方法寻找碳酸盐岩和铀的可能性。该区近二分之一的面积位于 Ouachita 山脉。而另一部分则位于墨西哥湾沿岸平原。上述两部分虽有碱性火成侵入岩,但页岩、砂岩、致密石英岩及松散沉积物仍是该地区的主要岩性。根据地质和地球化学的相似性原则,整个地区可以分成4个地球化学区。使用中子活化分析法分析稀土元素(REE)、钛、氟、铀及其它17种元素。

关键词：碳酸盐岩铀矿床水系沉积物元素地球化学勘探

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Evaluation of Doppler-ultrasonography in the diagnosis of transjugular intrahepatic portosystemic shunt dysfunction: A prospective study

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World Journal of Hepatology 2017年第27期9卷 1125-1132页

作者： Charlotte Nicolas Amelie Le Gouge Louis d’Alteroche Jean ayoub Monica Georgescu Vincent Vidal Denis Castaing Jean-Pierre Cercueil Patrick Chevallier Jerome Roumy Herve Trillaud Louis Boyer Vincent Le Pennec Christophe Perret Bruno Giraudeau Jean-Marc Perarnau STIC-TIPS group Service d’Hepato-Gastroenterologie Hopital TrousseauCHRU Tours CIC CHRU de Tours INSERM United’echographie-doppler Hopital TrousseauCHRU Tours Service de Radiologie Hopital de la Timone Centre Hepato-Biliaire Hopital Paul Brousse Service de Radiologie CHRU Dijon Service d’Imagerie Medicale Diagnostique et interventionnelle Hopital de l’ArchetⅡNice Service de Radiologie et Echographie CHRU Poitiers Service d’Imagerie Medicale Hopital Saint Andre CHRU Bordeaux Service d’Imagerie viscerale et vasculaire CHRU Clermont Ferrand Service de Radiologie CHRU Caen Service de Radiologie CHRU Nantes 不详

AIM To prospectively evaluate the performance of Dopplerultrasonography(US) for the detection of transjugular intrahepatic portosystemic shunt(TIPS) dysfunction within a multicenter cohort of cirrhotic *** This study was conducted in 10 french teaching hospitals. After TIPS insertion, angiography and liver Doppler-US were carried out every six months to detect dysfunction(defined by a portosystemic gradient ≥ 12 mm Hg and/or a stent stenosis ≥ 50%). The association between ultrasonographic signs and dysfunction was studied by logistic random-effects models, and the diagnostic performance of each Doppler criterion was estimated by the bootstrap method. This study was approved by the ethics committee of *** Two hundred and eighteen pairs of examinations performed on 87 cirrhotic patients were analyzed. Variables significantly associated with dysfunction were: The speed of flow in the portal vein(P = 0.008), the reversal of flow in the right(P = 0.038) and left(P = 0.049) portal branch, the loss of modulation of portal flow by the right atrium(P = 0.0005), ascites(P = 0.001) and the overall impression of the operator(P = 0.0001). The diagnostic performances of these variables were low; sensitivity was < 58% and negative predictive value was < 73%. Therefore, dysfunction cannot be ruled out from Doppler-US. CONCLUSION The performance of Doppler-US for the detection of TIPS dysfunction is poor compared to angiography. New tools are needed to improve diagnosis of TIPS dysfunction.

关键词： Transjugular intrahepatic portosystemic shunt Dysfunction Doppler-ultrasonography

微观层析成像技术在地球科学中的应用——几何结构特征、岩石物性模拟及尺度升级

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微观层析成像技术在地球科学中的应用——几何结构特征、岩石物性...

Evidence for a ‘preinvasive’ variant of fungal sinusitis: Tissue invasion without angioinvasion

2014年中国地球科学联合学术年会——专题20：岩石物...

作者：刘洁 Klaus Regenauer-Lieb Reem Freij-ayoub University of Western Australia 中山大学地球科学与地质工程学院 CSIRO Earth Science and Resource Engineering University of New South Wales

＜正＞利用岩石微观层析成像,我们分析微观结构的几何学特征,模拟计算微观尺度上材料物性参数,并提取尺度率参数从而分析材料物性的尺度升级问题。微观结构的几何特征由体积百分比、比表面积、连通性（逾滲）,与及结构的各向异性表征[1]...

＜正＞利用岩石微观层析成像,我们分析微观结构的几何学特征,模拟计算微观尺度上材料物性参数,并提取尺度率参数从而分析材料物性的尺度升级问题。微观结构的几何特征由体积百分比、比表面积、连通性（逾滲）,与及结构的各向异性表征[1],自主开发的程序可以快速处理超大规模数据以获取这些特征参数。岩石物性参数（滲透率和力学参数）通过基于代表性体元（RVE）的数值模拟获得,包括孔隙尺度流体动力学模拟和微观结构固体力学相应分

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World Journal of Otorhinolaryngology-Head and Neck Surgery 2017年第1期3卷 -页

作者： Hassan Paknezhad Nicole A.Borchard Greg W.Charville Noel F.ayoub Garret W.Choby Andrew Thamboo Jayakar V.Nayak Division of Rhinology Department of Otolaryngology-Head and Neck SurgeryStanford University School of MedicineUSA

Clinical experience has suggested the existence of an intermediate form of fungal sinusitis between the categories of non-invasive fungal sinusitis (non-IFS) and invasive fungal sinusitis (IFS).This fungal sinusitis variant demonstrates unhealthy mucosa by endoscopy with fungal invasion,but lacks angioinvasion microscopically,representing what clinically behaves as a ‘pre-invasive’ subtype of fungal *** non-IFS disease,patients with preinvasive fungal sinusitis were still felt to require anti-fungal medications due to histologic presence of invasive *** sharing some clinical features of IFS,these ‘intermediate’ patients were successfully spared extended and repeated surgical debridements given the microscopic findings,and have been successfully treated with shorter courses of antifungal *** select patients have had favorable outcomes when managed in a judicious and semi-aggressive manner,in an undefined zone between the treatments for routine fungal ball and aggressive IFS.

关键词： Fungal sinusitis Invasive fungal sinusitis IFS Chronic rhinosinusitis Fungal ball Visual loss Immunocompromised Immunosuppressed Antifungal therapy

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代替置换加密网络概率统计的完备性

通信保密 1983年第2期 25-34页

作者： F.ayoub B.Sc M.Sc 纯如晨曦

本文给出了含有随机置换在内的代替置换加密网络,并且证明了经过少数几轮变换以后,该网络仍然以很高的概率保持着完备性这一密码方面的重要特性。虽然密码机的成本有中等程度的增加,但是新网络有两个优点,其一,它证明了可以去掉有意设... 详细信息

本文给出了含有随机置换在内的代替置换加密网络,并且证明了经过少数几轮变换以后,该网络仍然以很高的概率保持着完备性这一密码方面的重要特性。虽然密码机的成本有中等程度的增加,但是新网络有两个优点,其一,它证明了可以去掉有意设置的诀窍(trapdoor);其二,该网络具有较高的保密性能。

关键词：完备性第一级所有完全性单元的概率密码密钥空间密码分析矩阵数学分析保密性能

Common Prothrombotic Gene Mutations in Cerebral Venous Sinus Thrombosis in North-West of Iran

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Neuroscience & Medicine 2017年第4期8卷 68-76页

作者： Elyar sadeghi-Hokmabadi Ebrahim Sakhinia Mehdi Farhoudi Somayyeh Hasaneh Morteza Ghojazadeh Mohammad Amin Farzi Sasan Andalib Masoumeh Nemati Omid Abbaszadeh Reza Rikhtegar Reshad Mirnour Neurosciences Research Center Department of Neurology Imam-Reza Hospital School of Medicine Tabriz University of Medical Sciences Tabriz Iran Connective Tissue Research Center Department of Medical Genetics Faculty of Medicine and Tabriz Genetic Analysis Centre (TGAC) Tabriz University of Medical Sciences Tabriz Iran Liver and Gastrointestinal Disease Research Center Tabriz University of Medical Sciences Tabriz Iran Department of Neurosurgery Poursina Hospital School of Medicine Guilan University of Medical Sciences Rasht Iran

Objective: Cerebral venous sinus thrombosis (CVST) is a life-threatening cerebrovascular disease which has high prevalence and mortality rate in Iran. Thrombophilia caused by gene mutation is a common cause of CVST. The present study aimed at assessing the prevalence of thrombophilic gene mutations in Iranian CVST patients and then comparing it with normal population. Materials and methods: In a case-control study, polymerase chain reaction-restriction fragment length polymorphism (PCR_RFLP) and amplification-refractory mutation system (ARMS-PCR) were carried out to detect common thrombophilic mutations in 70 CVST patients. Next, it was compared with 82 sex- and age-matched healthy controls. Results: Factor-V-Leiden, Factor-V-Leiden HR2, Factor prothrombin II, MTHFR (667C/T) and MTHFR (1298A/C) prevalence were significantly high in cases of CVST as compared to the controls (P values: 0.012, 0.019, 0.007 and 0.036, respectively). However, there was no significant difference between the two groups in plasminogen activator inhibitor (PAI), angiotensin-converting enzyme (ACE), beta-fibrinogen (FGB), Factor VIII, Factor XIII, and tissue plasminogen activator (tPA) mutations. Conclusion: The findings of the present study suggest that Factor V-Leiden, Factor-V-Leiden HR2, prothrombin II (G20210A), and MTHFR (667C/T & 1298A/C) mutations are more frequent in CVST. Detection of these mutations may help clinicians to decide on the duration of treatment and referral to genetic counseling for valuable prevention.

关键词： Gene Mutation Cerebral Venous Sinus Thrombosis Thrombophilia

Correlation between Cognitive Functions, Fatigue, Depression and Disability Status in a Cohort of Multiple Sclerosis Patients

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World Journal of Neuroscience 2016年第3期6卷 208-213页

作者： Seyed Massood Nabavi S. Tahbaz A. Salahesh Z. Behjati F. Nourbala S. sadeghi Z. Saeedi D. Morsali Shima Haghani Center for Neuroscience and Cognition Royan Institute Tehran Iran Iranian Journal of Neurology Iranian Neurological Association Tehran Iran Psychology Department Shahid Behehsty University Tehran Iran Multiple Sclerosis Research Unit Mostafa Medical Center Shahed University Tehran Iran Avicenna Research Institute Shahid Beheshti University Tehran Iran Zendegi Psychology Services Center Tehran Iran Young Researchers and Elite Club Azad University Tehran Iran Neurology Department Medical Faculty University of Texas Health Huston TX USA Clinical Research Department Tehran Heart Center Tehran Iran

Objective: To investigate the relationship between depression, fatigue, disability and cognitive skills of patients with multiple sclerosis in a cohort of patients with multiple sclerosis in a single center in Tehran, Iran. Methods: One hundred and forty-seven patients with multiple sclerosis with mean age of 33 years, mean disease duration of 20.20 months, mean EDSS of 2.13, and F to M ratio of 76.5% over 23% were recruited for the purpose of this study. Cognitive function was compared with healthy control subjects (n = 100). Depression was measured by Beck Depression Inventory (BDI), fatigue was assessed using Fatigue Severity Scale (FSS) and Modified Fatigue Impact Scale (MFIS), disability was evaluated by Expanded Disability Status Scale (EDSS), and cognitive function was assessed by Brief Repeatable Battery of Neuropsychological tests (BRB-N). All data were analysed using Pearson correlation. Results: Age and disability level generally correlated negatively and significantly with task performance, whereas a higher level of education was associated with better task performance. While the correlation between BDI, FSS, and MIFS was significantly positive, BDI was negatively correlated with the two subscales of BRB, namely PASAT and WLG. Higher levels of depression in patients with MS are associated with lower cognitive performance in tasks requiring higher-order working memory (WM) processes. FSS showed the strongest negative correlation score with BRB, however, the same parameter displayed significant positive correlation with MFIS. Moreover, the global EDSS scores were negatively correlated with BRB. Relative to controls, cognitive performance of MS patients was deficient in all BRB-N measures except Symbol Digit Modalities Test which is a measure of attention and processing speed. Conclusions: Depression, fatigue, and disability (the most common problems observed in MS patients) are clearly related with cognitive impairment in MS patients. Also, MS patients exh

关键词： Fatigue Depression Cognitive Dysfunction Disability Multiple Sclerosis

表面粗糙和带槽的湿式离合器接合的有限元模型

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传动技术 2015年第2期29卷 39-47页

作者： E.J.Berger F.sadeghi C.M.Krousgrill school of Mechanical Engineer-ing purdue University

已经开发了一个有限元模型,研究表面粗糙和带槽纸质可渗透的湿式离合器的接合特性。采用有限元方法(Galerkin)离散修正雷诺和力平衡方程式,采用等参量方程式解所描述的有关内何学。通过Patir和Cheng(1978)的通用流量模型模拟表面粗糙度... 详细信息

已经开发了一个有限元模型,研究表面粗糙和带槽纸质可渗透的湿式离合器的接合特性。采用有限元方法(Galerkin)离散修正雷诺和力平衡方程式,采用等参量方程式解所描述的有关内何学。通过Patir和Cheng(1978)的通用流量模型模拟表面粗糙度的影响。在表面粗糙状况下,采用Greenwond和William son(1966)方法计算负荷分配,采用开发的有限元模型研究所加负荷的影响,以及湿式离合器摩擦材料的渗透率和槽出入口尺寸的接合特性(即转矩、油压、接合时间和油膜厚度)。研究结果表明,所加负荷、摩擦材料渗透率和槽宽度对接合特性的影响显著。高的配合面压力增大了峰值和减少了接合时间但显著增大了峰值转矩,宽油槽减少峰值转矩和增加了接合时间。对于本模型油槽深度对接合特性的影响不太明显。

关键词：有限元模型摩擦材料湿式离合器数学模型

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微空心阴极放电数值模拟和发射光谱实验研究

微空心阴极放电数值模拟和发射光谱实验研究