检索结果-南通市图书馆

Effectiveness of external prestressing in enhancing the non-ductile hanger failure mechanism in reinforced concrete inverted T-beams

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2024年第7期18卷 1050-1065页

作者： Ahmed M.ATTA reda N.BEHIRY mohammed I.HARAZ Structural Engineering Department Faculty of EngineeringTanta UniversityTanta 33511Egypt Nile Higher Institute for Engineering and Technology Mansoura 11001Egypt

Recently,inverted T-beams have been used in reinforced concrete(RC)bridges to support transverse precast *** T-beams,contrary to practice with conventional beams,are loaded on the flanges upper *** loading configuration causes hanger failure due to the generation of vertical tensile stresses near the bottom of the *** key purpose of this study is to investigate the efficiency of vertical external prestressing stainless-steel bars in mitigating non-ductile hanger failure in reinforced concrete inverted *** experimental study on six inverted-T beams,including two un-strengthened specimens,was carried *** study showed that the value of the prestressing level had a considerable impact on the performance of hanger mechanism in relation to crack pattern,ultimate loads,cracking behavior,load-deflection,strains,and *** experimental results indicated that the suggested method for strengthening inverted T-beams had efficacy in reducing the seriousness of the non-ductile hanger failure and resulted in a strength increase of up to 53% when compared to that of the un-strengthened ***,two analytical models for estimating the hanger capacity and the average crack width of the strengthened RC inverted T-beams were *** models that were proposed exhibited a high degree of agreement with the experimental results.

关键词： RC bridges inverted T-beams strengthening hanger failure external prestressing

Challenges to establishing and maintaining kidney transplantation programs in developing countries:What are the coping strategies?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Methodology 2024年第2期14卷 1-16页

作者： Rabea Ahmed Gadelkareem Amr Mostafa Abdelgawad Nasreldin mohammed mohammed Ali Zarzour Mahmoud Khalil Ahmed reda Hisham Mokhtar Hammouda Department of Urology Assiut Urology and Nephrology HospitalFaculty of MedicineAssiut UniversityAssiut 71515Egypt

Kidney transplantation(KT)is the optimal form of renal replacement therapy for patients with end-stage renal ***,this health service is not available to all patients,especially in developing *** deceased donor KT programs are mostly absent,and the living donor KT centers are ***-center studies presenting experiences from developing countries usually report a variety of *** review addresses these challenges and the opposing strategies by reviewing the single-center experiences of developing *** financial challenges hamper the infrastructural and material availability,coverage of transplant costs,and qualification of medical *** sociocultural challenges influence organ donation,equity of beneficence,and regular follow-up *** interests and motives for transplantation may result from high medicolegal responsibilities in KT practice,intense potential psychosocial burdens,complex qualification protocols,and low productivity or compensation for KT *** medical literacy about KT advantages is prevalent among clinicians,patients,and the *** inefficient organizational and regulatory oversight is translated into inefficient healthcare systems,absent national KT programs and registries,uncoordinated job descriptions and qualification protocols,uncoordinated on-site investigations with regulatory constraints,and the prevalence of commercial KT *** challenges resulted in noticeable differences between KT services in developed and developing *** coping strategies can be summarized in two main mechanisms:The first mechanism is maximizing the available resources by increasing the rates of living kidney donation,promoting the expertise of medical personnel,reducing material consumption,and supporting the establishment and maintenance of KT *** latter warrants the expansion of the public sector and the elimination of non-ethical KT *** second mechanism is recru

关键词： Challenges Coping strategies Developing countries Kidney transplantation Low resources Single-center

Optimized sequential therapy vs 10- and 14-d concomitant therapy for eradicating Helicobacter pylori: A randomized clinical trial

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第6期30卷 556-564页

作者： Hassan Seddik Jihane Benass Sanaa Berrag Asmae Sair reda Berraida Hanae Boutallaka Department of Gastroenterology II Mohammed V Military Teaching Hospital of RabatRabat 10100Morocco Department of Gastroenterology Mohammed V University in RabatRabat 10100Morocco Department of Gastroenterology I Mohammed V Military Teaching Hospital of RabatRabat 10100Morocco

BACKGROUND A cure for Helicobacter pylori(***)remains a problem of global *** prevalence of antimicrobial resistance is widely rising and becoming a challenging issue *** sequential therapy seems to be one of the most attractive strategies in terms of efficacy,tolerability and *** most common sequential therapy consists of a dual therapy[proton-pump inhibitors(PPIs)and amoxicillin]for the first period(5 to 7 d),followed by a triple therapy for the second period(PPI,clarithromycin and metronidazole).PPIs play a key role in maintaining a gastric pH at a level that allows an optimal efficacy of antibiotics,hence the idea of using new generation *** open-label prospective study randomized 328 patients with confirmed *** infection into three groups(1:1:1):The first group received quadruple therapy consisting of twice-daily(bid)omeprazole 20 mg,amoxicillin 1 g,clarith-romycin 500 mg and metronidazole 500 mg for 10 d(QT-10),the second group received a 14 d quadruple therapy following the same regimen(QT-14),and the third group received an optimized sequential therapy consisting of bid rabe-prazole 20 mg plus amoxicillin 1 g for 7 d,followed by bid rabeprazole 20 mg,clarithromycin 500 mg and metronidazole 500 mg for the next 7 d(OST-14).AEs were recorded throughout the study,and the *** eradication rate was determined 4 to 6 wk after the end of treatment,using the 13C urea breath *** In the intention-to-treat and per-protocol analysis,the eradication rate was higher in the OST-14 group compared to the QT-10 group:(93.5%,85.5%P=0.04)and(96.2%,89.5%P=0.03)***,there was no statist-ically significant difference in eradication rates between the OST-14 and QT-14 groups:(93.5%,91.8%P=0.34)and(96.2%,94.4%P=0.35),*** overall incidence of AEs was significantly lower in the OST-14 group(P=0.01).Furthermore,OST-14 was the most cost-effective among the three *** The optimized 14-

关键词： Helicobacter pylori Quadruple therapy Sequential Proton-pump inhibitor Optimization

Fast vectorized distance matrix computation for multiple sequence alignment on multi-cores

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2015年第6期8卷 243-257页

作者： mohammed W. A1-Neama Naglaa M. reda Fayed F. M. Ghaleb Department of Mathematics Faculty of Science AI-Azhar UniversityP. O. Box (11884) Al-Nasr Road Cairo Egypt Education College for GirlsMosul University Mosul Iraq Department of Mathematics Faculty of Science Ain Shams University Cairo Egypt

Although high quality multiple sequence alignment is an essential task in bioinforma- tics, it becomes a big dilemma nowadays due to the gigantic explosion in the amount of molecular data. The most consuming time and space phase is the distance matrix computation. This paper addresses this issue by proposing a vectorized parallel method that accomplishes the huge number of similarity comparisons faster in less space. Per- formance tests on real biological datasets using core-iT show superior results in terms of time and space.

关键词： Bioinformatics multiple sequence alignment distance matrix parallel programming multi-cores.

Cytotoxic activity and phytochemical analysis of Arum palaestinum Boiss.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2015年第11期5卷 944-947页

作者： Mai mohammed Farid Sameh reda Hussein Lamiaa Fawzy Ibrahim mohammed Ali El Desouky Amr mohammed Elsayed Ahmad Ali El Oqlah Mahmoud mohammed Saker Department of Phytochemistry and Plant Systematic National Research Center Department of Biochemistry Cairo University Department of Biological Sciences Yarmouk University Department of Plant Biotechnology National Research Center

Objective: To evaluate the in vitro cytotoxic activity of the fractionated extract as well as isolated compounds of Arum palaestinum Boiss.(A. palaestinum)(black calla lily), and to identify the volatile components which may be responsible for the potential antitumor ***: A. palaestinum was collected from its natural habitats and subjected to phytochemical analysis for separation of pure compounds. In vitro cytotoxic activity was investigated against four human carcinoma cell lines Hep2, He La, Hep G2 and MCF7 for the fractionated extract and isolated compounds. While, the diethyl ether fraction was subjected to GC–MS analysis as it exhibited the most potent cytotoxic effect to evaluate the active constituents responsible for the cytotoxic ***: Four flavonoid compounds were isolated(luteolin, chrysoeriol, isoorientin,isovitexin) from the diethyl ether and ethyl acetate. The extracts and the pure isolated compounds showed a significant high antiproliferative activity against all investigated cell lines. The GC–MS analysis revealed the separation and identification of 15 compounds representing 95.01% of the extract and belonging to different groups of chemical ***: The present study is considered to be the first report on the cytotoxic activities carried out on different selected fractions and pure compounds of A. palaestinum to provide evidences for its strong antitumor activities. In addition,chrysoeriol and isovitexin compounds were isolated for the first time from the studied taxa.

关键词： Black calla lily Araceae Flavonoids Cytotoxic acti

Reasons and effects of the decline of willing related potential living kidney donors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Transplantation 2023年第5期13卷 276-289页

作者： Rabea Ahmed Gadelkareem Amr Mostafa Abdelgawad Nasreldin mohammed Ahmed reda Nashwa Mostafa Azoz mohammed Ali Zarzour Hisham Mokhtar Hammouda Mahmoud Khalil Department of Urology Assiut Urology and Nephrology HospitalFaculty of MedicineAssiut UniversityAssiut 71515Egypt Department of Internal Medicine-Nephrology Unit Assiut University HospitalFaculty of MedicineAssiut UniversityAssiut 71515Egypt

BACKGROUND Although the availability of related living donors(LDs)provides a better chance for receiving kidney transplantation(KT),the evaluation protocols for LD selection remain a safeguard for the LD’s *** protocols are variable from one center to another,resulting in variable rates of decline of the potential LDs(PLDs).The decline of willing PLDs may occur at any stage of evaluation,starting from the initial contact and counseling to the day of *** To identify the causes of the decline of PLDs,the predictors of PLD candidacy,and the effect on achieving *** A retrospective study was performed on the willing PLDs who attended our outpatient clinic for kidney donation to their related potential recipients between October 2015 and December *** variables influencing their candidacy rate and the fate of their potential recipients were *** groups of PLDs were compared:Candidate PLDs after a completed evaluation vs non-candidate PLDs with a complete or incomplete evaluation.A multivariate logistic regression was performed to assess the factors contributing to the achievement of PLD *** Of 321 willing PLDs,257 PLDs(80.1%)accessed the evaluation to variable extents for 212 potential recipients,with a mean age(range)of 40.5±10.4(18-65)years,including 169 females(65.8%).The remaining 64 PLDs(19.9%)did not access the *** 58 PLDs(18.1%)succeeded in donating,but 199 PDLs(62.0%)were declined;exclusion occurred in 144 PLDs(56.0%)for immunological causes(37.5%),medical causes(54.9%),combined causes(9.7%),and financial causes(2.1%).Regression and release occurred in 55 PLDs(17.1%).The potential recipients with candidate PLDs were not significantly different from those with non-candidate PLDs,except in age(P=0.041),rates of completed evaluation,and exclusion of PLDs(P<0.001).There were no factors that independently influenced the rate of PLD *** patients who failed to have KT after the decline of their P

关键词： Donor decline Donor evaluation Donor exclusion Kidney transplantation Living kidney donors Related living donors

Preemptive living donor kidney transplantation:Access,fate,and review of the status in

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Nephrology 2023年第3期12卷 40-55页

作者： Rabea Ahmed Gadelkareem Amr Mostafa Abdelgawad Ahmed reda Nashwa Mostafa Azoz mohammed Ali Zarzour Nasreldin mohammed Hisham Mokhtar Hammouda Mahmoud Khalil Department of Urology Assiut Urology and Nephrology HospitalFaculty of MedicineAssiut UniversityAssiut 71515Egypt Department of Internal Medicine Assiut University HospitalFaculty of MedicineAssiut UniversityAssiut 71515Egypt

BACKGROUND Preemptive living donor kidney transplantation(PLDKT)is recommended as the optimal treatment for end-stage renal *** To assess the rate of PLDKT among patients who accessed KT in our center and review the status of PLDKT in *** We performed a retrospective review of the patients who accessed KT in our center from November 2015 to November *** addition,the PLDKT status in Egypt was reviewed relative to the *** Of the 304 patients who accessed KT,32 patients(10.5%)had preemptive access to KT(PAKT).The means of age and estimated glomerular filtration rate were 31.7±13 years and 12.8±3.5 mL/min/1.73 m2,***-nine patients had KT,including 3 PLDKTs only(5.1%of total KTs and 9.4%of PAKT).Twenty-nine patients(90.6%)failed to receive PLDKT due to donor unavailability(25%),exclusion(28.6%),regression from donation(3.6%),and patient regression on starting dialysis(39.3%).In multivariate analysis,known primary kidney disease(P=0.002),patient age(P=0.031)and sex(P=0.001)were independent predictors of achievement of KT in our ***,PAKT was not significantly(P=0.065)associated with the achievement of *** of the literature revealed lower rates of PLDKT in Egypt than those in the *** Patient age,sex,and primary kidney disease are independent predictors of achieving living donor *** its non-significant effect,PAKT may enhance the low rates of *** main causes of non-achievement of PLDKT were patient regression on starting regular dialysis and donor unavailability or exclusion.

关键词： Access to kidney transplantation Donor regression Kidney transplantation Living donors Preemptive kidney transplantation Transplantation

Chemotherapy Toxicity Profile in Adjuvant Treated Colorectal Carcinoma Patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Cancer Therapy 2020年第2期11卷 74-87页

作者： Nagy Samy Gobran mohammed reda Kelany mohammed Abdallah Fathy Clinical Oncology & Nuclear Medicine Department Ain Shams University Cairo Egypt

Background:?Colorectal cancer (CRC) is the third most common cancer and the fourth leading cause of cancer-related deaths in the world. The treatment of stage III CRC consists of surgery followed by adjuvant chemotherapy with either single agent capecitabine or combination therapy consisting of FOLFOX?or XELOX, all of which have been shown to be effective in improving disease-free survival (DFS) and overall survival (OS). However, toxicities acquired from chemotherapy can affect a cancer patient’s quality of life and result in early?treatment discontinuation. Common toxicities include hematological, gastrointestinal (GI), constitutional, dermatological, and neurological.?Aim of the Work: The present work was aimed to assess and evaluate chemotherapy toxicities in adjuvant treatment in CRC patients and analyze certain factors that might increase chemotherapy toxicity. Patients and Methods: This is retrospective study included a total of 72 patients of colorectal carcinoma received adjuvant chemotherapy at Clinical Oncology Department, Ain Shams University. The study was conducted between Jan. 2012 and Jan. 2017. Results: We found that?the most chemotherapy reported was neurological toxicity in (73.6%), gastrointestinal symptoms (diarrhea 52.7%, nausea 30.6%, vomiting 27.8% & oral mucositis 24%), hematological toxicity (neutropenia 40.3%, anemia 34.7%, thrombocytopenia 12.5%), fatigue 20.9%, hepatic toxicity 18.1%, dermatological toxicity 9.7% & renal toxicity 5.6%). older patients have significant incidence of neurological toxicity (p-value?= 0.023) and fatigue (p-value?= 0.038). females have significant incidence of anemia (p-value = 0.017). increase of oxaliplatin?cumulative dose increase incidence of neurological toxicity (p-value?= 0.024), thrombocytopenia (p-value?= 0.007) and renal toxicity (p-value?= 0.030). Oxaliplatin containing regimens have high significant correlation with neurological toxicity (p-value = 0.000) and capcitabine has high significant correl

关键词： Chemotherapy Toxicity Adjuvant Chemotherapy CRC

Coverless Image Steganography System Based on Maze Game Generation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2023年第11期38卷 125-138页

作者： Al Hussien Seddik Saad mohammed S.reda GamalM.Behery Ahmed A.El-harby mohammed Baz Mohamed Abouhawwash Ahmed Ismail Ebada Department of computer science Faculty of ScienceMinia UniversityShalabyMiniaEgypt Department of computer science Faculty of Computers and Artificial IntelligenceDamietta UniversityNew DamiettaDamiettaEgypt Department of Computer Engineering College of Computer and Information TechnologyTaif UniversityP.O.Box 11099Taif21994Saudi Arabia Department of Mathematics Faculty of ScienceMansoura UniversityMansoura35516Egypt Department of Computational Mathematics Scienceand Engineering(CMSE)College of EngineeringMichigan State UniversityEast LansingMI48824USA Department of Information Systems Faculty of Computers and Artificial IntelligenceDamietta UniversityNew DamiettaDamiettaEgypt

The trend of digital information transformation has become a topic of *** data are threatening;thus,protecting such data from attackers is considered an essential ***,a new methodology for data concealing has been suggested by researchers called coverless *** steganography can be accomplished either by building an image database to match its image subblocks with the secret message to obtain the stego image or by generating an *** paper proposes a coverless image steganography system based on pure image generation using secret message bits with a capacity higher than the other traditional *** system uses the secret message to generate the stego image in the form of one of the Intelligence Quotient(IQ)games,the ***,a full grid is generated with several specific rows and columns determined from the number of bits of the secret ***,these bits are fed to the full grid to form the maze game stego ***,the generated maze game stego image is sent to the *** experimental results,using the Bit Error Rate(BER),were conducted,and confirmed the strength of this system represented by a high capacity,perfect performance,robustness,and stronger hiding system compared with existing coverless steganography systems.

关键词： Coverless data hiding digital image steganography intelligence quotient games maze game