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Review of Alloy Membranes/Films for Hydrogen Separation or Purification

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Journal of Rare Earths 2005年第S1期23卷 611-616页

作者：王仲民 Li Vanessa sammy Lap-Ip Chan Department of Information Science and Engineering Guilin University of Electronic Technology Guilin 541004 China School of Material Science and Engineering University of New South Wales Sydney NSW 2052 Australia

Hydrogen separation and purification are two important chemical processes in the extensive application of hydrogen energy. Membrane technology has opened up a potential solution to the problems of separation and purification in an energy effective way. Membranes of adequate hydrogen permeability, good thermal and mechanical stability are the key to successful application of membrane technology in hydrogen separation and purification. In this paper, the relative parameters concerning hydrogen permeability, the development of different types of membranes namely: palladium composite membranes; V-based alloy membranes, specific functionality embraced alloy membranes, metal hydride (MH) thin films and fabrications, were reviewed and discussed. Pd-free membranes are found to be the ideal alternatives. Suitable MH thin films with mono- or multi-layer microstructures produced by novel fabrication techniques, is likely to be the promising candidates due to possessing properties distinct from those of bulk materials in membrane form.

关键词： hydrogen separation and purification membrane thin film hydrogen permeability

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sammy烘焙心经

COVID-19 in Liver Transplant Recipients

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Journal of Clinical and Translational Hepatology 2021年第4期9卷 545-550页

作者： Ravina Kullar Ankur Prakash Patel sammy Saab Expert Stewardship Inc.Newport BeachCAUSA David Geffen School of Medicine at the University of California at Los Angeles Los AngelesCAUSA

Background and Aims:Coronavirus disease 2019(COVID-19)has infected over 93 million people worldwide as of January 14,*** studies have gathered data on liver transplant patients infected with ***,we discuss the presentation of COVID-19 in immunosuppressed patients with prior liver *** also evaluate patient outcomes after ***:We searched the PubMed database for all studies focused on liver transplant patients with ***:We identified eight studies that evaluated COVID-19 infection in liver transplant patients(n=494).Hypertension was the most prevalent comorbidity in our *** inhibitors were the most common immunosuppressant medications in the entire *** average time from liver transplant to COVID-19 infection in our cohort was 74.1 *** and cough,at 70%and 62%respectively,were the most common symptoms in our *** total,50%of the patients received hydroxychloroquine as treatment for *** next most prevalent treatment was azithromycin,given to 30%of patients in our *** total,80%of the patients were admitted to a hospital and 17%required intensive care unit-level care,with 21%having required mechanical *** mortality was 17%in our ***:Given the immunocompromised status of liver transplant patients,more intensive surveillance is necessary for severe cases of COVID-19 *** liver transplantations have been restricted during the COVID-19 pandemic,further investigation is warranted for studying the risk of COVID-19 infection in liver transplant patients.

关键词： COVID-19 Liver transplantation Immunosuppression

Free tissue transfer for lower extremity trauma in the pediatric patient

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Plastic and Aesthetic Research 2022年第1期9卷 529-538页

作者： sammy Othman Denis Knobel Division of Plastic and Reconstructive Surgery Department of SurgeryNorthwell HealthNew YorkNY 11021USA

Aim:The utilization of free-tissue transfer secondary to traumatic lower extremity defects in the pediatric population is scarcely *** include microsurgeon inexperience,inadequate center resources,and fear of historically described poor surgical *** aim of this study is to investigate more recent articles describing free-flap microsurgical reconstruction for these ***:A systematic review of the literature was conducted through the online databases PubMed,Embase,and Web of Science,examining for articles with at least 20 subjects utilizing free-tissue transfer for soft-tissue defects of the pediatric(aged 18 and younger)lower extremity following traumatic etiology since *** included flap failure,return to the operating room,and functional status,where ***:Seven studies were deemed appropriate for inclusion,with a total of 243 flaps *** vehicle and motorcycle accidents were greater than 75%of total *** defects involved the foot or ankle(65.1%).In total,perforator flaps compromised the majority of flaps(54%),with the most common being the anterolateral thigh,the scapular/parascapular,and deep inferior epigastric *** common perforators included the groin flap,tensor fascia lata,radial forearm,lateral arm,and thoracodorsal perforator ***-based flaps were less common(46%),with the latissimus dorsi and rectus muscle flaps composing the *** most commonly used recipient vessel was the anterior tibialis(49.5%)and posterior tibialis vessels(45.3%).Most studies performed reconstruction within 7-10 days of *** was a cumulative 6.5%flap failure ***:Free tissue transfer for pediatric lower extremity trauma is an important tool that likely leads to powerful *** trends indicate increasing usage of perforator *** study shows that based on existing data,free flap utilization for pediatric patients is an adequate modality for repair,and ma

关键词： Reconstructive surgery pediatric trauma pediatric lower extremity microsurgery soft-tissue freetissue transfer

A modified θ projection model for constant load creep curves-Ⅱ.Application of creep life prediction

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Journal of Materials Science & Technology 2019年第4期35卷 687-694页

作者： Chao Fu Yadong Chen Xiaofei Yuan sammy Tin Stoichko Antonov Koichi Yagi Qiang Feng Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology Beijing Department of Mechanical Materials& Aerospace EngineeringIllinois Institute of Technology National Center for Materials Service Safety University of Science and Technology Beijing

To minimize the deviation of the predicted creep curves obtained under constant load conditions by the original θ projection model, a new modified version that can be expressed by ε = θ_1(1-e^(-θ2t)) +θ3 (e^(θ_4e^θ5^εt)-1), was derived and experimentally validated in our last study. In the present study, the predictive capability of the modified θ projection model was investigated by comparing the simulated and experimentally determined creep curves of K465 and DZ125 superalloys over a range of temperatures and stresses. Furthermore, the linear relationship between creep temperature and initial stress was extended to the 5-parameter model. The results indicated that the modified model could be used as a creep life prediction method, as it described the creep curve shape and resulted in predictions that fall within a specified error interval. Meanwhile, this modified model provides a more accurate way of describing creep curves under constant load conditions. The limitations and future direction of the modified model were also discussed. In addition, this modified θ projection model shows great potential for the evaluation and assessment of the service safety of structural materials used in components governed by creep deformation.

关键词： Superalloy Constant load creep Modified θ projection model Uniform deformation stage Prediction performance

A modified θ projection model for constant load creep *** of the model

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Journal of Materials Science & Technology 2019年第1期35卷 223-230页

作者： Chao Fu Yadong Chen Xiaofei Yuan sammy Tin Stoichko Antonov Koichi Yagi Qiang Feng Beijing Advanced Innovation Center for Material Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Department of Mechanical Materials & Aerospace Engineering Illinois Institute of Technology National Center for Materials Service Safety University of Science and Technology Beijing

Estimating long-term creep deformation and life of materials is an effective way to ensure the service safety and to reduce the cost of long-term integrity evaluation of high temperature structural *** the 1980 s, the θ projection model has been widely used for predicting creep lives due to its ability to capture the characteristic transitions observed in creep curves obtained under constant true stress conditions. However, the creep rupture behavior under constant load or engineering stress conditions cannot be simulated accurately using this model because of the different stress states. In this paper, creep curves obtained under constant load conditions were analyzed using a modified θ projection model by considering the increase in true stress with creep deformation during the creep tests. This model is expressed as ε = θ_1(1-e^(-θ_2t)) + θ3 e^(θ_4e^θ5^εt)-1, and was validated using the creep curves of K465 and DZ125 superalloys tested at a range of temperatures and engineering stresses. Moreover, it was shown that the predictive capability of the modified θ projection model was significantly improved over the original one, as it reduces the prediction uncertainty from a range of 10% to 20% to below 5%. Meanwhile,it was shown that the model can be reasonably used for predicting constant stress creep conditions, when appropriate parameters are used. The prediction performance of the modified model will be discussed in another paper. The results of this study show great potential for the evaluation and assessment of the service safety of structural materials used in applications where designs are limited by creep deformation.

关键词： Superalloy Creep Life prediction Modified θ projection model Constant load creep

Structural stability of single-layered LaNi_4.25Al_0.75 film and its electro-chemical hydrogen-storage properties

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Rare Metals 2006年第5期25卷 543-548页

作者： WANG Zhongmin Chi Ying Vanessa Li ZHOU Huaiying sammy Lap Ip Chan SHI Liu Center of Material Science and Engineering Guilin University of Electronic Technology Guilin 541004 China School of Materials Science and Engineering University of New Sooth Wales Sydney NSW 2052 Australia Institute of Metal Research Chinese Academy of Sciences China

AB5-based hydrogen storage thin fdms （LaNi4.25Al0.75）, deposited on Cu substrate by dc magnetron sputtering were investigated in this study. X-ray diffraction （XRD） revealed that the microstructure of the layer was in crystal form. SEM and AFM analyses proved that the film appeared to be rather rough with numerous randomly sized pores of approximately 15-40 in nm diameter. Structural stability of the film was examined by the combined analyses of DSC, XRD, and SEM, which indicated that this film maintained its structural stability below 500 K or so, and a network structure was observed on the film after being heated at 700 K for 30 min. Electrochemical hydrogen-storage properties of the films were investigated by simulated battery tests. It was found that single-layered LaNi4.25A10.75 film exhibited electrochemical hydrogen-storage properties similar to typical AB5 alloys in bulk, and the maximum discharge capacity of the film was about 220 mAh/g. After 20 charge/discharge cycles, small needle-shaped aluminium oxide was formed on some fractions of the film surface.

关键词： hydrogen storage thin film magnetron sputtering structural stability electrochemical properties

Human immunodeficiency virus and nodular regenerative hyperplasia of liver: A systematic review

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World Journal of Hepatology 2014年第1期6卷 55-63页

作者： Archita Sood Mariana Castrejón sammy Saab Department of Medicine Olive View Medical Center Department of Surgery University of California at Los Angeles Medical Center Departments of Medicine and Surgery University of California at Los Angeles Medical Center

AIM: To investigate the diagnosis, pathogenesis, natural history, and management of nodular regenerative hyperplasia(NRH) in patients with human immunodeficiency virus(HIV). METHODS: We performed a systematic review of the medical literature regarding NRH in patients with HIV. Inclusion criteria include reports with biopsy proven NRH. We studied the clinical features of NRH, in particular, related to its presenting manifestation and laboratory values. Combinations of the following keywords were implemented: "nodular regenerative hyperplasia", "human immunodeficiency virus", "noncirrhotic portal hypertension", "idiopathic portal hypertension", "cryptogenic liver disease", "highly active antiretroviral therapy" and "didanosine". The bibliographies of these studies were subsequently searched for any additional relevant ***: The clinical presentation of patients with NRH varies from patients being completely asymptomatic to the development of portal hypertension – namely esophageal variceal bleeding and ascites. Liver associated enzymes are generally normal and synthetic function well preserved. There is a strong association between the occurrence of NRH and the use of antiviral therapies such as didanosine. The management of NRH revolves around treating the manifestations of portal hypertension. The prognosis of NRH is generally good since liver function is preserved. A high index of suspicion is required to make a identify NRH. CONCLUSION: The appropriate management of HIVinfected persons with suspected NRH is yet to be outlined. However, NRH is a clinically subtle condition that is difficult to diagnose, and it is important to be able to manage it according to the best available evidence.

关键词： Human immunodeficiency virus Nodular regenerative hyperplasia Ascites Systematic review Liver complications

Hepatitis C Screening: Barriers to Linkage to Care

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Journal of Clinical and Translational Hepatology 2019年第3期7卷 226-231页

作者： sammy Saab Youssef PChallita Lisa MNajarian Rong Guo Satvir SSaggi Gina Choi Departments of Surgery University of California at Los AngelesLos AngelesCAUSA Departments of Medicine University of California at Los AngelesLos AngelesCAUSA Departments of Medicine Statistics Core University of California at Los AngelesLos AngelesCAUSA

Background andAims:Hepatitis C(HCV)is a medical and public health *** infected individuals are identified,management includes not only education but also the use of antiviral *** screening for HCV is readily available,barriers exist which prevent assessment and treatment in individuals potentially infected with ***:This is a retrospective study of patients screened for HCV within the University of California,Los Angeles Health Care System between February 22 and July 9,*** defined linkage to care as:1)confirmatory HCV RNA test after screening HCV antibody test found a positive result;and 2)follow-up appointment for treatment was established with a *** and baseline laboratory values were *** potentially associated with prohibiting linkage of care were ***:During the study period,17,512 individuals were screened for HCV.A total of 238(1.35%)were found to have detectable HCV *** the individuals with detectable HCV antibodies,48(20%)did not undergo confirmatory testing with viral *** the 190 individuals who underwent further testing,70 patients were noted to be *** them,17 of the 70(24%)were not linked to a specialist for further *** patients(p=0.02)and people who inject drugs(p=0.02)were less likely to be referred for specialty ***:The results of our study highlight that younger patients and people who inject drugs are less likely to be referred to specialty care for HCV *** are needed to engage these populations.

关键词： Hepatitis C Screening Linkage