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| 1 | Assessing the Dynamics of Grassland Net Primary Productivity in Response to Climate Change at the Global Scale显示文摘Understanding the net primary productivity(NPP) of grassland is crucial to evaluate the terrestrial carbon cycle. In this study, we investigated the spatial distribution and the area of global grassland across the globe. Then, we used the Carnegie-Ames-Stanford Approach(CASA) model to estimate global grassland NPP and explore the spatio-temporal variations of grassland NPP in response to climate change from 1982 to 2008. Results showed that the largest area of grassland distribution during the study period was in Asia(1737.23 × 104 km^2), while the grassland area in Europe was relatively small(202.83 × 10~4 km^2). Temporally, the total NPP increased with fluctuations from 1982 to 2008, with an annual increase rate of 0.03 Pg C/yr. The total NPP experienced a significant increasing trend from 1982 to 1995, while a decreasing trend was observed from 1996 to 2008. Spatially, the grassland NPP in South America and Africa were higher than the other regions, largely as a result of these regions are under warm and wet climatic conditions. The highest mean NPP was recorded for savannas(560.10 g C/(m^2·yr)), whereas the lowest was observed in open shrublands with an average NPP of 162.53 g C/(m^2·yr). The relationship between grassland NPP and annual mean temperature and annual precipitation(AMT, AP, respectively) varies with changes in AP, which indicates that, grassland NPP is more sensitive to precipitation than temperature. | LIU Yangyang YANG Yue WANG Qian KHALIFA Muhammad ZHANG Zhaoying TONG Linjing LI Jianlong SHI Aiping | 2019 | Chinese Geographical Science2019，29，5： | 12 |
| 2 | Effect of Aging on the Toughness of Austenitic and Duplex Stainless Steel Weldments显示文摘In the present study,the effect of aging heat treatment at 650,750,and 850?C on the impact toughness of 316L austenitic stainless steel,2205 duplex stainless steel and their weldments has been investigated.Welding process was conducted using the TIG(tungsten inert gas) welding technique.Instrumented impact testing,at room temperature,was employed to determine the effect of aging treatment on the impact properties of investigated materials.Aging treatment resulted in degradation in the impact toughness as demonstrated by the reduction in the impact fracture energy and deformation parameters(strain hardening capacity,fracture deffection,and crack initiation and propagation energy).The degree of embrittlement was more noticeable in duplex stainless steel parent and weld-metal than in 316L stainless steel and became greater with the increase of aging temperature.The degradation in impact toughness was discussed in relation to the observed precipitation of the intermetallic sigma phase in the microstructure of the stainless steel weldments and the corresponding fracture surface morphology. | Omyma Hassan Ibrahim Ibrahim Soliman Ibrahim Tarek Ahmed Fouad Khalifa | 2010 | Journal of Materials Science & Technology2010，26，9： | 12 |
| 3 | CDX2 as a marker for intestinal differentiation: Its utility and limitations显示文摘CDX2 is a nuclear homeobox transcription factor that belongs to the caudalrelated family of CDX homeobox genes. The gene encoding CDX2 is a nonclustered hexapeptide located on chromosome 13q12-13. Homeobox genes play an essential role in the control of normal embryonic development. CDX2 is crucial for axial patterning of the alimentary tract during embryonic development and is involved in the processes of intestinal cell proliferation, differentiation, adhesion, and apoptosis. It is considered specif ic for enterocytes and has been used for the diagnosis of primary and metastatic colorectal adenocarcinoma. CDX2 expression has been reported to be organ specif ic and is normally expressed throughout embryonic and postnatal life within the nuclei of epithelial cells of the alimentary tract from the proximal duodenum to the distal rectum. In this review, the authors elaborate on the diagnostic utility of CDX2 in gastrointestinal tumors and other neoplasms with intestinal differentiation. Limitations with its use as the sole predictor of a gastrointestinal origin of metastatic carcinomas are also discussed. | Reda S Saad Zeina Ghorab Mahmoud A Khalifa | 2011 | World Journal of Gastrointestinal Surgery2011，3，11： | 11 |
| 4 | The past, current and future trends in DNA vaccine immunisations显示文摘This review focuses on DNA vaccines, denoting the last two decades since the early substantiation of preclinical protection was published in Science in 1993 by Ulmer et al. In spite of being safely administered and easily engineered and manufactured DNA vaccine, it holds the future prospects of immunization by inducing potent cellular immune responses against infectious and non-infectious diseases. It is well documented that injection of DNA plasmid encoding a desired gene of interest can result in the subsequent expression of its products and lead to the induction of an immune response within a host. This is pertinent to prophylactic and therapeutic vaccination approach when the peculiar gene produces a protective epitope from a pathogen. The recent studies demonstrated by a number of research centers showed that these immune responses evoke protective immunity against several infectious diseases and cancers, which provides adequate support for the use of this approach. We attempt in this review to provide an informative and unbiased overview of the general principles and concept of DNA vaccines technology with a summary of a novel approach to the DNA vaccine, present investigations that describe the mechanism(s) of protective immunity provoked by DNA immunization and to highlight the advantages and disadvantages of DNA immunisation. | Sidgi Syed Anwer Abdo Hasson Juma Khalifa Zayid Al-Busaidi Talal Abdulmalek Sallam | 2015 | Asian Pacific Journal of Tropical Biomedicine2015，5，5： | 7 |
| 5 | Transcranial magnetic stimulation for geriatric depression: Promises and pitfalls显示文摘As the global population gets older, depression in the elderly is emerging as an important health issue. A major challenge in treating geriatric depression is the lack of robust efficacy for many treatments that are of significant benefit to depressed working age adults. Repetitive transcranial magnetic stimulation(r TMS) is a novel physical treatment approach used mostly in working age adults with depression. Many TMS trials and clinics continue to exclude the elderly from treatment citing lack of evidence in this age group. In this review, we appraise the evidence regarding the safety and efficacy of rT MS in the elderly. A consistent observation supporting a high degree of tolerability and safety among the elderly patients emerged across the Randomised Controlled Trials and the uncontrolled trials. Further, there is no reliable evidence negating the utility of rT MS in the elderly with depression. We also identified several factors other than age that moderate the observed variations in the efficacy of rT MS in the elderly. These factors include but not limited to:(1) brain atrophy;(2) intensity and number of pulses(dose-response relationship); and(3) clinical profile of patients. On the basis of the current evidence, the practice of excluding elderly patients from TMS clinics and trials cannot be supported. | Priyadharshini Sabesan Sudheer Lankappa Najat Khalifa Vasudevan Krishnan Rahul Gandhi Lena Palaniyappan | 2015 | World Journal of Psychiatry2015，5，2： | 7 |
| 6 | Accuracy and outcome of rapid ultrasound in shock and hypotension (RUSH) in Egyptian polytrauma patients显示文摘 | Adel Hamed Elbaih Ahmed Mohamed Housseini Mohamed E.M. Khalifa | 2018 | Chinese Journal of Traumatology2018，21，3： | 4 |
| 7 | Predicting the presence of adenomatous polyps during colonoscopy with National Cancer Institute Colorectal Cancer Risk-Assessment Tool显示文摘AIM To evaluate the National Cancer Institute(NCI)Colorectal Cancer(CRC)Risk Assessment Tool as a predictor for the presence of adenomatous polyps(AP) found during screening or surveillance colonoscopy.METHODS This is a retrospective single center observational study.We collected data of adenomatous polyps in each colonoscopy and then evaluated the lifetime CRC risk.We calculated the AP prevalence across risk score quintiles,odds ratios of the prevalence of AP across risk score quintiles,area under curves(AUCs)and Youden’s indexes to assess the optimal risk score cut off value for AP prevalence status.RESULTS The prevalence of AP gradually increased throughout the five risk score quintiles:i.e.,27.63%in the first and 51.35%in the fifth quintile.The odd ratios of AP prevalence in the fifth quintile compared to the first and second quintile were 2.76[confidence interval(CI):1.71-4.47]and 2.09(CI:1.32-3.30).The AUC for all patients was 0.62(CI:0.58-0.66).Youden’s Index indicated the optimal risk score cutoff value discriminating AP prevalence status was 3.60.CONCLUSION Patients with the higher NCI risk score have higher risk of AP and subsequent CRC;therefore,measures to increase the effectiveness of CRC detection in these patients include longer withdrawal time,early surveillance colonoscopy,and choosing flexible colonoscopy over other CRC screening modalities. | Hassan Tariq Muhammad Umar Kamal Harish Patel Ravi Patel Muhammad Ameen Shehi Elona Maram Khalifa Sara Azam Aiyi Zhang Kishore Kumar Ahmed Baiomi Danial Shaikh Jasbir Makker | 2018 | World Journal of Gastroenterology2018，24，34： | 3 |
| 8 | Safety and efficacy of surgical hip dislocation in managing femoral head fractures: A systematic review and meta-analysis显示文摘BACKGROUND Femoral head fractures(FHFs)are considered relatively uncommon injuries;however,open reduction and internal fixation is preferred for most displaced fractures.Several surgical approaches had been utilized with controversial results;surgical hip dislocation(SHD)is among these approaches,with the reputation of being demanding and leading to higher complication rates.AIM To determine the efficacy and safety of SHD in managing FHFs by reviewing the results reported in the literature.METHODS Major databases including PubMed,Embase,Web of Science,and Cochrane Central Register of Controlled Trials were searched to identify studies reporting on outcomes of SHD utilized as an approach in treating FHFs.We extracted basic studies data,surgery-related data,functional outcomes,radiological outcomes,and postoperative complications.We calculated the mean differences for continuous data with 95%confidence intervals for each outcome and the odds ratio with 95%confidence intervals for binary outcomes.P<0.05 was considered significant.RESULTS Our search retrieved nine studies meeting our inclusion criteria,with a total of 129 FHFs.The results of our analysis revealed that the average operation time was 123.74 min,while the average blood loss was 491.89 mL.After an average followup of 38.4 mo,a satisfactory clinical outcome was achieved in 85%of patients,ranged from 30%to 86%,with avascular necrosis,heterotopic ossification,and osteoarthritis being the most common complications occurring at an incidence of 12%,25%,and 16%,respectively.Trochanteric flip osteotomy nonunion and trochanteric bursitis as a unique complication of SHD occurred at an incidence of 3.4%and 3.8%,respectively.CONCLUSION The integration of SHD approach for dealing with FHFs offered acceptable functional and radiological outcomes with a wide range of safety in regards to the hip joint vascularity and the development of avascular necrosis,the formation of heterotopic ossification,and the development of posttraumatic osteoarthritis;however,it still carries its unique risk of trochanteric flip osteotomy nonunion and persistent lateral thigh pain. | Ahmed A Khalifa Mohamed A Haridy Ali Fergany | 2021 | World Journal of Orthopedics2021，12，8： | 3 |
| 9 | 超声处理触变铸造A356合金的显微组织特征和拉伸性能(英文)显示文摘在A356合金凝固过程中,对锭坯进行超声振动处理。采用不同工艺将锭坯重新加热至半固态,然后采用模铸机进行触变铸造。结果表明,经重新加热和触变铸造后,超声处理的锭坯具有均匀分布的细小球状α(Al)。与未进行超声处理的锭坯相比,经超声处理的触变铸造锭坯具有更高的拉伸强度和伸长率。经超声处理的触变铸造锭坯在拉力作用下表现出韧性断裂倾向,而未经处理的锭坯则呈现出明显的小刻面,表现为脆性断裂。超声熔体处理作为一种触变铸造的处理方法具有可行性和竞争力。 | Waleed KHALIFA Shimaa EL-HADAD Yoshiki TSUNEKAWA | 2015 | Transactions of Nonferrous Metals Society of China2015，25，10： | 3 |
| 10 | Parametric and numerical study of a solar system for heating a greenhouse equipped with a buried exchanger显示文摘 | I. Attar N. Naili N. Khalifa M. Hazami A. Farhat | 2013 | Energy Conversion and Management2013，，： | 2 |
| 11 | Association of hepatitis C virus infection and diabetes in central Tunisia显示文摘AIM:To investigate hepatitis C virus(HCV) seroprevalence in Tunisian patients with diabetes mellitus and in a control group.METHODS:A cross-sectional study was conducted to determine the HCV seroprevalence in 1269 patients with diabetes(452 male,817 female) and 1315 nondiabetic patients,attending health centers in Sousse,Tunisia.HCV screening was performed in both groups using a fourth-generation enzyme immunoassay.RESULTS:In the diabetic group,17(1.3%) were found to be HCV-infected compared with eight(0.6%) in the control group,although the difference was not significant(P=0.057).Quantitative PCR was performed in 20 patients.Eleven patients were positive and showed HCV genotype 1b in all cases.CONCLUSION:Frequency of HCV antibodies was low in patients with diabetes and in the control group in central Tunisia,with no signifi cant difference between the groups. | Naoufel Kaabia Elhem Ben Jazia Ines Slim Imen Fodha Wissem Hachfi Rafika Gaha Mabrouk Khalifa Aoutef Hadj Kilani Halim Trabelsi Ahmed Abdelaziz Fethi Bahri Amel Letaief | 2009 | World Journal of Gastroenterology2009，15，22： | 2 |
| 12 | Decision Making Algorithmic Approaches Based on Parameterization of Neutrosophic Set under Hypersoft Set Environment with Fuzzy, Intuitionistic Fuzzy and Neutrosophic Settings显示文摘Hypersoft set is an extension of soft set as it further partitions each attribute into its corresponding attribute-valued set.This structure is more flexible and useful as it addresses the limitation of soft set for dealing with the scenarios having disjoint attribute-valued sets corresponding to distinct attributes.The main purpose of this study is to make the existing literature regarding neutrosophic parameterized soft set in line with the need of multi-attribute approximate function.Firstly,we conceptualize the neutrosophic parameterized hypersoft sets under the settings of fuzzy set,intuitionistic fuzzy set and neutrosophic set along with some of their elementary properties and set theoretic operations.Secondly,we propose decision-making-based algorithms with the help of these theories.Moreover,illustrative examples are presented which depict the structural validity for successful application to the problems involving vagueness and uncertainties.Lastly,the generalization of the proposed structure is discussed. | Atiqe Ur Rahman Muhammad Saeed Sultan S.Alodhaibi Hamiden Abd El-Wahed Khalifa | 2021 | Computer Modeling in Engineering & Sciences2021，，8： | 2 |
| 13 | Development of Cementitious Materials from Wastes and By-Products Generated in Oman显示文摘 | Ramzi A. Taha Khalifa S. Al-Jabri Ali S. AI-Harthy Tamer Al-Wahaibi | 2011 | 材料科学与工程(中英文版)2011，5，4： | 2 |
| 14 | Preserving apple(Malus domestica var.Anna)fruit bioactive substances using olive wastes extract-chitosan film coating显示文摘Apple fruits have components of therapeutic nature.Such components,to a great extent,decline or decompose during post-harvest that negatively affect fruit shelf-life.Chitosan fruit-filming has proved useful in maintaining these compounds.This study aims,therefore,at enhancing Chitosan coating-film performance by mixing with some olive wastes extracts of leaf and pomace extracts.Apple fruits were sprayed with six different coating formulas including chitosan-water wax coating,in addition to the uncoated fruits.Then,the total phenolic,flavonoids,antioxidants,pigments,weight loss,decay area,and microstructure were assayed.The bioactive substances drastically changed in uncoated rather than coated fruits.Conversely,weight loss and decay area significantly increased in uncoated fruits.Amazingly,the addition of olive leaf extract to chitosan coating films meaningfully reduced the gradual decline in total phenolic,flavonoids and antioxidants.Olive pomace extract recorded the lowest influencing on anthocyanins during storage at 4±1C for 35 d.Also,both olive leaf and pomace extracts enhanced the coating distribution,due to no pores were observed in the fruits’surfaces.Decidedly,incorporation of olive leaf extracts with 2%into chitosan coating solution was the best formula comparable with the others.Thus,olive wastes extracts,incorporated into chitosan fruit coatings;relatively improve the nutritional quality of apple fruits during post-harvest. | Ibrahim Khalifa Hassan Barakat Hamdy A.El-Mansy Soliman A.Soliman | 2017 | Information Processing in Agriculture2017，4，1： | 2 |
| 15 | Integrating knowledge management into enterprise environments for the next generation decision support 显示文摘 | BOLLOJU N KHALIFA M TURBAN E | 2002 | Decision Support Systems2002，33，2： | 2 |
| 16 | The SARS-CoV-2 pandemic course in Saudi Arabia:A dynamic epidemiological model显示文摘Objective:Saudi Arabia ranks second in the number of coronavirus disease 2019(COVID-19)cases in the Eastern Mediterranean region.It houses the two most sacred religious places for Muslims:Mecca and Medina.It is important to know what the trend in case numbers will be in the next 4e6 months,especially during the Hajj pilgrimage season.Methods:Epidemiological data on COVID-19 were obtained from the Saudi Arabian Ministry of Health.A susceptible-exposed-infectious-recovered(SEIR)prediction model was constructed to predict the trend in COVID-19 in Saudi Arabia in the next 6 months.Findings:The model predicts that the number of active cases will peak by 22 May 2020.The cumulative infected cases are predicted to reach 70,321 at that time.The total number of infected individuals is estimated reach to 114,580 by the end of the pandemic.Conclusion:Our estimates show that by the time the Hajj season commences in Saudi Arabia,the pandemic will be in the midst of its deceleration phase(phase 3).This information will likely be useful to policymakers in their management of the outbreak. | Abdullah Murhaf Al-Khani Mohamed Abdelghafour Khalifa Abdulrahman Almazrou Nazmus Saquib | 2020 | Infectious Disease Modelling2020，5，1： | 2 |
| 17 | Factors motivating software piracy: A longitudinal study显示文摘 | Limayem M Khalifa M and Chin WW | 2004 | IEEE transations on engineering management2004，51，4： | 1 |
| 18 | Effect of modifying roughage/concentrate ratio on semen quality and fertility as 'affected by exhaustive ejaculation in Zaraibi billygoats显示文摘 | Khalifa E I Khalek T M E1-Shafie M A et ol | 2010 | Egyptian J Sheep Goat Sci2010，5，2： | 1 |
| 19 | Intramural pregnancy following difficult embryo transfer显示文摘 | Khalifa Y Redgment CJ Yazdani N | 1994 | Hum Reprod1994，9，12： | 1 |
| 20 | Online consumer retention : Contingent effects of online shopping habit and online shopping ex- perience显示文摘 | Khalifa M Liu V | 2007 | European Journal of Information Systems2007，16，6： | 1 |
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