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Indole and Its Derivatives as Corrosion Inhibitors for C-Steel during Pickling

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Journal of Materials Science & Technology 2000年第3期16卷 291-296页

作者： S.h.Sanad, A.A.Ismail and A.A.El-Meligi (Physical Chemistry Dept., National Research Centre, Dokki, Cairo, Egypt) Physical Chemistry Dept. National Research Centre Dokki Cairo Egypt

The corrosion of three types of C-steel in 10% hydrochloric acid solution has been investigated in the absence and the presence of the inhibitors, indole (A), indole acetic acid (B), indole butyric acid (C), and 3-acetyl indole (D), by weight-loss measurements at different temperatures (30～70℃). The results showed that inhibiting efficiency depended upon the presence of the substituted groups in the pyrrole ring. The inhibiting efficiency of the inhibitors increased in the order: Inh. Ch. Bh. Ah. D. Linear Arrhenius plots were obtained in the absence and the presence of inhibitors. Results elucidated the effect of temperatures and molecular structure on the inhibition efficiency. The activation energy, Ea, of the three alloys was calculated and it was found that it depended on the type of steel and inhibitor.

关键词： Carbon steel

Facial basal cell carcinoma:A retrospective study of 67 cases

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World Journal of Clinical Cases 2023年第7期11卷 1488-1497页

作者： Afrah A Khalil hamid h Enezei Tahrir N Aldelaimi Raid M Al-Ani Department of Oral Diagnosis College of DentistryUniversity of AnbarRamadi 31001AnbarIraq Department of Oral and Maxillofacial Surgery College of DentistryUniversity of AnbarRamadi 31001AnbarIraq Department of Surgery/Otolaryngology University of AnbarCollege of MedicineRamadi 31001AnbarIraq

BACKGROUND Basal cell carcinoma(BCC)is a slow-growing malignant tumor characterized by local invasiveness but an exceptionally rare metastatic *** ideally affects sun-exposed skin of older patients with more propensity for the facial *** To evaluate the different clinicopathological characteristics of the facial BCC and the efficacy and safety of diode laser for the treatment of these *** We retrospectively reviewed facial BCC lesions ofhem to diode laser ablation during the period from September 2016 to August 2021 at Al-Ramadi Teaching hospital,Ramadi City,*** matching the age,gender,duration,site,and clinical and histological types were registered for every *** functional and aesthetic outcomes and complications following diode laser ablation for each patient were also *** Of 67 patients with facial BCC,there was 65.67%from the age group≥60 years and 58.21%*** mean duration of the lesions was 5.15±1.836 *** most involved location was the nose(29.85%).About half of the cases belong to the noduloulcerative *** histological type comprises 40.3%of the cases,while the least was keratotic(13.4%).Moreover,65.2%of the solid cases were from the age group≤60 years and 38.6%of the adenoid type from the age group>60 years(P value=0.007).Excellent aesthetic and functional outcomes were reported in all cases after 6 mo of *** complications were reported after diode laser *** Facial BCC was mostly seen in the elderly and *** mean duration was 5.15 *** nose was the commonest involved *** lesions were seen in approximately half of the *** age of the patients determined the histological type of the lesion(solid type was mostly seen in the age group≤60 years,while,adenoid in the age group>60 years).Diode laser ablation showed excellent functional and aesthetic outcomes following a 6-mo follow-up.

关键词： Basal cell carcinoma Maxillofacial pathology histopathology Malignant skin tumors Dermatological lesions Diode laser

Microstructure and Strain hardening of a Friction Stir Welded high-Strength Al–Zn–Mg Alloy

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Acta Metallurgica Sinica(English Letters) 2014年第4期27卷 723-729页

作者： A.h.Feng D.L.Chen Z.Y.Ma W.Y.Ma R.J.Song School of Materials Science and Engineering Tongji University State Key Laboratory of Advanced Welding Production Technology School of Materials Science and EngineeringHarbin Institute of Technology Department of Mechanical and Industrial Engineering Ryerson UniversityTorontoON M5B 2K3Canada Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences

Microstructural evolution and strain hardening behavior of a friction stir welded（FSWed） high-strength7075Al-T651 alloy were *** nugget zone was observed to consist of fine and equiaxed recrystallized grains with a low dislocation density and free of original precipitates,but containing uniformly distributed *** strength,joint efficiency,and ductility of the FSWed joints increased with increasing welding speed.A joint efficiency of ＊91% was achieved at a welding speed of 400 mm/min and rotational rate of 800 r/min,while the ductility remained basically the same as that of the base *** was no obvious strain rate sensitivity observed in both base metal and welded *** both the base metal and FSWed joints exhibited stage III and IV hardening characteristics,the hardening capacity,strain hardening exponent,and strain hardening rate all increased after friction stir welding.

关键词： Aluminum alloy Friction stir welding Mechanical properties Strain hardening

Improving hospital-based trauma care for road traffic injuries in Malawi

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World Journal of Emergency Medicine 2017年第2期8卷 85-90页

作者： Linda Chokotho Wakisa Mulwafu Isaac Singini Yasin Sjalale Kathryn h. Jacobsen Belt Cure hospital Blantyre Malawi Department of Surgery College of Medicine University of Malawi Blantyre Malawi Johns hopkins Project Blantyre Malawi Blantyre Adventist hospital Blantyre Malawi Department of Global & Community health George Mason University Fairfax Virginia USA

BACKGROUND: The mortality rate from road traffic injuries has increased in sub-Saharan Africa as the number of motor vehicles increase. This study examined the capacity of hospitals along Malawi's main north-south highway to provide emergency trauma ***: Structured interviews and checklists were used to evaluate the infrastructure, personnel, supplies, and equipment at all four of Malawi's central hospitals, ten district hospitals, and one mission hospital in 2014. Most of these facilities are along the main north-south highway that spans the ***: Between July 2013 and March 2014, more than 9 200 road traffic injuries(RTIs) and 100 RTI deaths were recorded by the participating hospitals. All of the hospitals reported staff shortages, especially during nights and weekends. Few clinicians had completed formal training in emergency trauma management, and healthcare workers reported gaps in knowledge and skills, especially at district hospitals. Most central hospitals had access to the critical supplies and medications necessary for trauma care, but district hospitals lacked some of the supplies and equipment needed for diagnosis, treatment, and personal ***: The mortality and disability burden from road traffi c injuries in Malawi(and other low-income countries in sub-Saharan Africa) can be reduced by ensuring that every central and district hospital has a dedicated trauma unit with qualified staff who have completed primary trauma care courses and have access to the equipment necessary to save lives.

关键词： Traffic accidents Emergency medical services Developing countries Road traffi c injuries Sub-Saharan Africa

Effect of Icosahedral Phase on Crystallographic Texture and Mechanical Anisotropy of Mg–4%Li Based Alloys

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Journal of Materials Science & Technology 2017年第5期33卷 475-480页

作者： C.Q.Li D.K.Xu S.Yu L.Y.Sheng E.h.han School of Materials Science and Engineering Northeastern University CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering Shenyang Aerospace University Shenzhen Institute Peking University Shenzhen Key Lab Human Tissue Regenerate & Repair

Through investigating and comparing the microstructure and mechanical properties of the as-extruded Mg alloys Mg-4%Li and Mg-4%Li-6%Zn-l.2%Y （in wt%）, it demonstrates that although the formation of I-phase （Mg3Zn6Y, icosahedral structure） could weaken the crystallographic texture and improve the me- chanical strength, the mechanical anisotropy in terms of strength remains in Mg-4%Li-6%Zn-1.2%Y alloy. Failure analysis indicates that for the Mg-4%Li alloy, the fracture surfaces of the tensile samples tested along transverse direction （TD） contain a large number of plastic dimples, whereas the fracture surface exhibits quasi-cleavage characteristic when tensile samples were tested along extrusion direction （ED）. For the Mg-4%Li-6%Zn-I.2%Y alloy, typical ductile fracture surfaces can be observed in both ＂TD＂ and ＂ED＂ samples. Moreover, due to the zonal distribution of broken l-phase particles, the fracture surface of ＂TD＂ samples is characterized by the typical ＂woody fracture＂.

关键词： Mg-Li alloy Texture Mechanical anisotropy Fracture

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新型光电作动器产生的非均匀力矩对板的控制

机械工程学报 2010年第12期46卷 175-181页

作者：姜晶岳洪浩邓宗全 TZOU h S 哈尔滨工业大学机电工程学院哈尔滨150001 肯塔基大学机械工程系

在特定波长的高能光束均匀照射下,镧改性锆钛酸铅(PLZT)铁电陶瓷由于在光电效应及逆压电效应的共同作用下会产生光致伸缩效应,可以实现对智能结构的非接触式精密激励。提出一种新的光致伸缩作动器的构型设计,它由4个单片的PLZT作动器构... 详细信息

在特定波长的高能光束均匀照射下,镧改性锆钛酸铅(PLZT)铁电陶瓷由于在光电效应及逆压电效应的共同作用下会产生光致伸缩效应,可以实现对智能结构的非接触式精密激励。提出一种新的光致伸缩作动器的构型设计,它由4个单片的PLZT作动器构成,由于每一片的不均衡的边界条件,此新型作动器可以产生不均匀的控制力及控制力矩,利用变分法计算出其控制力及控制力矩的近似分布曲线,利用模态扩展方法,分别计算此新型作动器对正方形板及矩形板的模态控制效果,计算作动器尺寸对控制效果的影响。通过与多自由度作动器的对比表明,此新型作动器由于会产生不均匀的控制力及控制力矩使它对板的某些模态的控制效果比多自由度作动器更好。

关键词：光致伸缩效应作动器构型板结构非接触精密控制

Quantitative visualization of Taylor-Couette flow with helical protrusion using optical and ultrasound imaging method

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排灌机械工程学报 2016年第10期34卷 829-834页

作者： KIM S.J. TU X.C. KIM h.B. School of Mechanical and Aerospace Engineering Gyeongsang National University Research Center for Aircraft Parts Technology Gyeongsang National University

The simplified flow of drilling process in the soil hardening or oil rig site was experimentally investigated. Two flow models were used. One is the concentric cylinders with helical protrusion at the inner cylinder. The other is the concentric plain wall cylinders with axial flow. The radius ratio and aspect ratio of both models are the same with 0. 65 and 48,respectively. The mud is the typical fluid seen in the soil hardening processes. We used the water and the mud for the working fluid. We used the optical PIV for the water flow measurement and echo PIV for the mud flow. In case of the water study,the dominant vortical structures appeared in both the protrusion and plain model with axial *** case of mud flow,the vortices shown in the water model disappeared and the push and pull-up motion by the protrusion is dominant. We believe this information can be useful to understand the flow physics of drilling process in the complex fluid flow.

关键词： Taylor-Couette flow surface protrusion echo PIV mud flow

Epidemiology of type 2 diabetes in the Middle East and North Africa:Challenges and call for action

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World Journal of Diabetes 2021年第9期12卷 1401-1425页

作者： Imad M El-Kebbi Nayda h Bidikian Layal hneiny Mona Philippe Nasrallah Department of Internal Medicine Division of EndocrinologyAmerican University of Beirut Medical CenterFaculty of MedicineBeirut 11072020Lebanon Department of Internal Medicine Sheikh Shakhbout Medical CityAbou Dhabi 11001United Arab Emirates School of Medicine American University of BeirutFaculty of MedicineBeirut 11072020Lebanon University Libraries Saab Medical LibraryAmerican University of BeirutBeirut 11072020Lebanon

Type 2 diabetes continues to be a serious and highly prevalent public health problem *** 2019,the highest prevalence of diabetes in the world at 12.2%,with its associated morbidity and mortality,was found in the Middle East and North Africa *** addition to a genetic predisposition in its population,evidence suggests that obesity,physical inactivity,urbanization,and poor nutritional habits have contributed to the high prevalence of diabetes and prediabetes in the *** risk factors have also led to an earlier onset of type 2 diabetes among children and adolescents,negatively affecting the productive years of the youth and their quality of ***,efforts to control the rising prevalence of diabetes and its complications have been challenged and complicated by the political instability and armed conflict in some countries of the region and the recent coronavirus disease *** strategies,coupled with targeted interventions at the regional,national,and community levels are needed to address and curb the spread of this public health crisis.

关键词： Type 2 diabetes Middle East and North Africa Epidemiology Prevalence Prediabetes Complications

Architecting Fault Tolerance with Exception handling: Verification and Validation

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Journal of Computer Science & Technology 2009年第2期24卷 212-237页

作者： Patrick h. S. Brito Rogério de Lemos Cecília M. F. Rubira Eliane Martins Institute of Computing State University of Campinas Brazil Computing Laboratory University of Kent U.K.

When building dependable systems by integrating untrusted software components that were not originally designed to interact with each other, it is likely the occurrence of architectural mismatches related to assumptions in their failure behaviour. These mismatches, if not prevented during system design, have to be tolerated during runtime. This paper presents an architectural abstraction based on exception handling for structuring fault-tolerant software systems. This abstraction comprises several components and connectors that promote an existing untrusted software element into an idealised fault-tolerant architectural element. Moreover, it is considered in the context of a rigorous software development approach based on formal methods for representing the structure and behaviour of the software architecture. The proposed approach relies on a formal specification and verification for analysing exception propagation, and verifying important dependability properties, such as deadlock freedom, and scenarios of architectural reconfiguration. The formal models are automatically generated using model transformation from UML diagrams： component diagram representing the system structure, and sequence diagrams representing the system behaviour. Finally, the formal models are also used for generating unit and integration test cases that are used for assessing the correctness of the source code. The feasibility of the proposed architectural approach was evaluated on an embedded critical case study.

关键词： exception handling fault-tolerant software architecture model-based test model checking software verification and validation