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Micro-fracturing Mechanisms Induced by Fluid Dissolution in Clay and Carbonate Rich Shales

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Micro-fracturing Mechanisms Induced by Fluid Dissolution in ...

作者： Khan waleed Ali 中国石油大学(北京)

学位级别：硕士

the utilization of acid has been approved as a potential approach to enhance Stimulated Reservoir Volume（SRV）by creating secondary pores and microfractures in shale *** paper proposed an acid soaking technique,spontaneous imbibition,core-flooding,and PFC2D modeling techniques to quantify the generation of microfracturing *** types of core samples from distinct shale depositional environments,namely Longmaxi carbonate-rich,and Yanchang clay-rich shale were *** acid（15%+3%KCL）was utilized to treat the shale samples for a period of 2 hours for acid *** acid（5%+2.5%KCL）,distilled water,and salt solution（Na

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Traumatic facial nerve paralysis dilemma. Decision making and the novel role of endoscope

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Journal of Otology 2022年第3期17卷 116-122页

作者： Mohamed Elkahwagi Mohammed Abdelbadie Salem waleed Moneir Hassan Allam ORL-HNS Mansoura university Egypt

Objective: the management of traumatic facial nerve paralysis(FNP) has remained a controversial issue with conflicting findings arguing between surgical decompression and conservative ***, recent advances in endoscopic surgery may consolidate the management plan for this ***: this prospective clinical study included patients with posttraumatic FNP at a tertiary referral center. Patients were categorized in two main groups: surgical and conservative. Indications for surgery included patients with immediate and complete FNP, no improvement in facial function on medical treatment, with electroneurography showing >90% degeneration or electromyography showing fibrillation potential. Patients who did not satisfy this criterion received the conservative approach. the transcanal endoscopic approach(TEA) or endoscopic assisted transmastoid approach was performed for facial nerve decompression in the surgical ***: the main outcome was facial function improvement, assessed using the House Brackmann grading scale(HBGS) 6 months after surgery, and hearing state assessed using the air bone gap(ABG).Results: the study included 38 patients, of whom 15 underwent had surgical decompression and 23underwent conservative therapy. A significant improvement in facial nerve function from a mean of4.66 ± 0.97 to 1.71 ± 0.69(P = 0.001) and ABG from a median of 30(10-40) to 20(10-25)(P = 0.002)was ***: Decision-making in cases of traumatic FNP is critical. the geniculate ganglion and tympanic segment were the most commonly affected areas in FNP cases. the TEA represents the most direct and least invasive approach for this area.

关键词： Posttraumatic Facial nerve Decompression Endoscopic Transcanal Electrodiagnostic

Endarterectomy for symptomatic non-stenotic carotids: a systematic review and descriptive analysis

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Stroke & Vascular Neurology 2022年第1期7卷 6-12页

作者： Anthony Larson Valentina Nardi waleed Brinjikji John Benson Giuseppe Lanzino Luis Savastano Department of Radiology Mayo ClinicRochesterMinnesotaUSA Neurosurgery Mayo ClinicRochesterMinnesotaUSA

Objective To systematically analyse prior reports of carotid endarterectomy(CEA)performed in cases of≤50%carotid stenosis in order to understand patient tolerance and potential *** A systematic review and descriptive analysis was performed in concordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses *** English-language search was performed of online databases using librarian-selected search *** were reviewed for relevance which included mention of carotid endarterectomy and *** or retrospective observational cohort studies that reported series of patients who underwent endarterectomy for minimal(≤50%)luminal stenosis with reported outcomes were *** Six studies(which included our institutional series)with a total of 143 patients met the inclusion *** weighted mean age at the time of CEA was 72.3 years;113(79.0%)were male.55.8%of patients with available data had recurrent ipsilateral ischaemic events despite medical *** patients out of 129 with available perioperative data(1.6%)had perioperative MRI findings of acute ischaemic stroke,both within the hemisphere contralateral to the side of *** the 138 patients with available follow-up(mean,36 months),none had recurrent ipsilateral ischaemic *** Endarterectomy for symptomatic carotid disease causing≤50%stenosis may be a potentially beneficial strategy to prevent stroke *** with robust methodology are needed to draw more definitive conclusions in terms of the safety and efficacy of endarterectomy for minimal stenosis with vulnerable features relative to intensive medical therapy.

关键词： carotid stenosis analysis

Hemodynamics in the immediate post-transplantation period in alcoholic and viral cirrhosis

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World Journal of Gastroenterology 2010年第5期16卷 608-612页

作者： waleed K Al-Hamoudi Saleh Alqahtani Puneeta Tandon Samuel S Lee Gastroenterology Unit(59) College of MedicineKing Saud UniversityPO Box 2925Riyadh 11461 Saudi Arabia Gastroenterology unit King Faisal Specialist Hospital&Research CenterJeddah 21499Saudi Arabia Alberta Liver Transplantation Program University of AlbertaEdmontonAlbertaT6G 2X8 Canada Liver Unit University of CalgaryCalgary AlbertaT2N 4N1Canada

AIM:To study the hemodynamics in the immediate post transplant period and compare patients with alcoholic vs viral cirrhosis. MEthODS:Between 2000-2003,38 patients were transplanted for alcoholic cirrhosis and 28 for postviral *** rate(HR),central venous pressure(CVP), mean arterial pressure(MAP),pulmonary capillary wedge pressure(PCWP),cardiac index(CI),systemic vascular resistance index(SVRI),pulmonary artery pressure(PAP),and pulmonary vascular resistance index(PVRI)were measured immediately and 24 h post transplantation. RESULTS:Hyperdynamic circulation persisted at 24 hfollowing transplantation with an elevated CI of 5.4± 1.3 L/(min×m 2 )and 4.9±1.0 L/(min×m 2 )in the viral and alcoholic groups,respectively,and was associated with a decreased *** the first 24 h, there was a significant decrease in HR and increase in MAP;the extent of the change was similar in both *** CVP,PCWP,and SVRI increased,and CI decreased in the viral patients,but not the alcoholic *** showed a lower PVRI(119±52 dynes/(cm 5 ×m 2 )vs 166±110 dynes/(cm5×m2),Pthe viral group at 24 h. CONCLUSION:Hyperdynamic circulation persists in the immediate post-transplant period with a faster improvement in the viral *** patients have a more pronounced pulmonary vasodilatation.

关键词： Hemodynamics Cirrhosis Alcohol Viral Allograft

Angiosarcomatous component in gliosarcoma: case report and consideration of diagnostic challenge and hemorrhagic propensity

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the Journal of Biomedical Research 2020年第2期34卷 143-148页

作者： Nancy Jiang Ramiro Larrazabal waleed Alsunbul Jian-Qiang Lu Department of Radiology McMaster University/Hamilton Health SciencesHamiltonOntario L8L 2X2Canada Department of Surgery/Neurosurgery McMaster University/Hamilton Health SciencesHamiltonOntario L8L 2X2Canada Department of Pathology and Molecular Medicine/Neuropathology McMaster University/Hamilton Health SciencesHamiltonOntario L8L 2X2Canada

An angiosarcomatous component in gliosarcoma may be associated with an increased intraoperative hemorrhagic risk and preoperative diagnostic challenge. We report a unique case of gliosarcoma with an angiosarcomatous component in a 61-year-old man. His brain MRI demonstrated a well-demarcated right occipital tumor with multiple flow voids and rim-like enhancement as well as intratumoral strip and nodular enhancements. He underwent a craniotomy for tumor resection. Intraoperatively, significant tumor hemorrhage required greater efforts to control intraoperative bleeding and to maintain hemostasis. Pathological examination of the tumor revealed alternating gliomatous and sarcomatous/angiosarcomatous components with intratumoral hemorrhage. He was postoperatively treated with chemoradiation. the tumor recurred at 9 months, for which the second resection was performed with similarly greater efforts to achieve hemostasis. the recurrent tumor was pathologically similar despite treatment-associated changes. Awareness of this angiosarcomatous component in gliosarcoma with the hemorrhagic risk is important for both the preoperative diagnosis and surgical management.

关键词： gliosarcoma glioblastoma variant angiosarcomatous component vascularity hemorrhage risk

URL Phishing Detection Using Particle Swarm Optimization and Data Mining

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Computers, Materials & Continua 2022年第12期73卷 5625-5640页

作者： Saeed M.Alshahrani Nayyar Ahmed Khan Jameel Almalki waleed Al Shehri College of Computing and IT-Shaqra University Shaqra155572Saudi Arabia Department of Computer Science College of Computer in Al-LeithUmm Al-Qura UniversityMakkahSaudi Arabia

the continuous destruction and frauds prevailing due to phishing URLs make it an indispensable area for *** techniques are adopted in the detection process,including neural networks,machine learning,or hybrid techniques.A novel detection model is proposed that uses data mining with the Particle Swarm Optimization technique(PSO)to increase and empower the method of detecting phishing *** selection based on various techniques to identify the phishing candidates from the URL is *** this approach,the features mined from the URL are extracted using data mining *** features are selected on the basis of URL *** classification of these features identified by the data mining rules is done using PSO *** selection of features with PSO optimization makes it possible to identify phishing *** a large number of rule identifiers,the true positive rate for the identification of phishing URLs is maximized in this *** experiments show that feature selection using data mining and particle swarm optimization helps tremendously identify the phishing URLs based on the structure of the URL ***,it can minimize processing time for identifying the phishing website ***,the approach can be beneficial to identify suchURLs over the existing contemporary detecting models proposed before.

关键词： Phishing particle swarm optimization feature selection data mining classification cloud application

Extraction of cobalt(Ⅱ) from aqueous solution by N,N'-carbonyl difatty amides

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Chinese Chemical Letters 2011年第4期22卷 469-472页

作者： Emad A.Jaffar Al-Mulla Khalid waleed S.Al-Janabi Department of Chemistry College of ScienceUniversity of KufaAnNajafIraq Department of Chemistry College of EducationBaghdad UniversityBaghdadIraq

the development of economic and environmentally friendly extractants to recover cobalt metal is required due to the increasing demand for this *** this study,solvent extraction of Co（Ⅱ） from aqueous solution using a mixture of N,N＇-carbonyl difatty amides（CDFAs） synthesised from palm oil as the extractant was carried *** effects of various parameters such as acid,contact time,extractant concentration,metal ion concentration and stripping agent and the separation of Co（Ⅱ） from other metal ions such as Fe（Ⅱ）,Ni（Ⅱ）,Zn（Ⅲ） and Cd（Ⅱ） were *** was found that the extraction of Co（Ⅱ） into the organic phase involved the formation of 1：1 ***（Ⅱ） was successfully separated from commonly associated metal ions such as Fe（Ⅱ）,Ni（Ⅱ）,Zn（Ⅲ） and Cd（Ⅱ）.Co（Ⅱ） stripping from the loaded organic phase was studied in aqueous *** results are useful to recover Co（Ⅱ） from aqueous solution utilising（CDFAs） as an extractant.

关键词： N N'-Carbonyl difatty amides Solvent extraction Co(Ⅱ)

Expansive Soil Stabilization by Bagasse Ash Partial Replacement of Cement

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Expansive Soil Stabilization by Bagasse Ash Partial Replacem...

作者： waleed Yahya Khedir Awadalseed 大连理工大学

学位级别：硕士

本文研究了甘蔗渣灰部分替代普通硅酸盐水泥(OPC)对膨胀土岩土性能的影响。研究了水泥处理膨胀土的压实特性、微观结构、张拉强度、抗压强度、CBR值、剪切波速和小应变剪切模量。按不同比例设计制备土样,在7天、14天和28天的不同养护时... 详细信息

本文研究了甘蔗渣灰部分替代普通硅酸盐水泥(OPC)对膨胀土岩土性能的影响。研究了水泥处理膨胀土的压实特性、微观结构、张拉强度、抗压强度、CBR值、剪切波速和小应变剪切模量。按不同比例设计制备土样,在7天、14天和28天的不同养护时间进行了标准击实试验、无侧限抗压强度试验、CBR试验、巴西劈裂试验和弯曲元试验。并进行了X射线衍射和扫描电镜测试。X射线衍射分析表明,甘蔗渣灰的主要矿物为石英和白晶石。扫描电镜分析表明,蔗渣灰中存在不同粒径的颗粒,有许多纤维状颗粒。结果表明,用蔗渣灰代替OPC可以改善处理后土壤的压实特性,使其最大干密度降低,最佳含水量提高。用蔗渣灰部分替代OPC还可以提高处理膨胀土的早期强度。结果表明,不同置换比例的试样的拉伸强度均有所提高,这可能是由于蔗渣灰纤维结构长,抗拉伸破坏能力强。当置换率不大于20%时,部分置换试件的CBR值甚至高于单独用水泥处理的试件。经处理后土体的弯曲单元试验表明,刚度存在明显的各向异性,但随着固化时间的延长和置换率的增加,刚度逐渐降低。试验结果表明,蔗渣灰是一种有效的矿物掺合料,CBA20(20%)是水泥的最佳替代率。。

关键词：膨胀土甘蔗渣灰弯曲元件刚度各向异性张拉强度

Visual and refractive outcomes of posterior chamber phakic IOL in stable keratoconus

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International Journal of Ophthalmology(English edition) 2019年第5期12卷 840-843页

作者： Sherif H Emerah Moataz M Sabry Hisham A Saad waleed A Ghobashy Ophthalmology Department Research Institute of Ophthalmology Magrabi Eye Hospital Ophthalmology Department Tanta University Ophthalmology Department Suez Canal University

We evaluated the visual and refractive outcomes after phakic visian toric implantable collamer lens(ICL) insertion in stable keratoconus(KC). this retrospective study investigated toric ICL implantation in 14 eyes of 8 patients with stable KC. After 6 mo, the mean uncorrected distance visual acuity improved significantly from 0.77 to 0.15 logMAR. the mean best corrected distance visual acuity(BCDVA) improved from 0.18±0.1 to 0.15±0.1 logMAR. Fifty percent of eyes maintained their preoperative BCDVA; 42.8% gained one line. there was no statistical difference in high order or coma aberration. the mean refractive manifest spherical equivalent(MSE), mean refractive manifest spherical error, mean manifest astigmatism decreased significantly postoperatively. At 6 mo postoperatively, our achieved mean spherical equivalent was approximately 74%. No intraoperative or postoperative complications occurred. Toric ICL implantation was effective, predictable and safe to correct refractive error and improve visual acuity in patients with stable KC.

关键词： coma keratoconus lens implantation intraocular