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Review: Enhancing power transfer capability through flexible AC transmission system devices: a review

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Frontiers of Information Technology & Electronic Engineering 2015年第8期16卷 658-678页

作者： Fadi m.ALBATSH saad mEKHILEF Shameem AHmAD H.mOKHLIS m.A.HASSAN Power Electronics and Renewable Energy Research Laboratory (PEARL) Department of Electrical EngineeringUniversity of Malaya Department of Electrical Engineering Faculty of Engineering University of Malaya Department of Engineering Design and manufacture University of Malaya

Global demand for power has significantly increased, but power generation and transmission capacities have not increased proportionally with this demand. As a result, power consumers suffer from various problems, such as voltage and frequency instability and power quality issues. To overcome these problems, the capacity for available power transfer of a transmission network should be enhanced. Researchers worldwide have addressed this issue by using flexible AC transmission system （FACTS） devices. We have conducted a comprehensive review of how FACTS controllers are used to enhance the avail- able transfer capability （ATC） and power transfer capability （PTC） of power system networks. This review includes a discussion of the classification of different FACTS devices according to different factors. The popularity and applications of these devices are discussed together with relevant statistics. The operating principles of six major FACTS devices and their application in increasing ATC and PTC are also presented. Finally, we evaluate the performance of FACTS devices in ATC and PTC improvement with respect to different control algorithms.

关键词： FACTS devices Available transfer capability Power transfer capability Artificial intelligence

Hydrothermal preparation of TiO_(2)-Ag nanoparticles and its antimicrobial performance against human pathogenic microbial cells in water

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BIOCELL 2018年第3期42卷 93-97页

作者： mahmoud mOUSTAFA saad ALAmRI mohamed ELNOUBY Tarek TAHA m.A.ABU-SAIED Ali SHATI mohamed AL-KAHTANI Sulaiman ALRUmmAN Department of Biology College of ScienceKing Khalid University9004AbhaKingdom of Saudi Arabia(KSA Department of Botany Faculty of ScienceSouth Valley UniversityQenaEgypt Composite and Nanostructured materials Research Department Advanced Technology and New Materials Research InstituteCity of Scientific Research and Technological Applications(SRTA-CITY)New Borg El-Arab City21934AlexandriaEgypt Environmental Biotechnology Department Genetic Engineering and Biotechnology Research Institute(GEBRI)City of Scientific Research and Technological Applications(SRTA-CITY)New Borg El-Arab City21934AlexandriaEgypt Polymer materials Research Department Advanced Technology and New Materials Research InstituteCity of Scientific Research and Technological Applications(SRTA-CITY)New Borg El-Arab City21934AlexandriaEgypt

Water contaminated with pathogenic microbes is considered as one of the most common routes for transmitting diseases in human *** methods have been applied for the decontamination of microbes in contaminated *** the current study,an easy to do hydrothermal method has been used for the preparation of TiO_(2)-Ag *** obtained material was characterised using a scanning electron microscope(SEm)and fourier transform infra-red spectroscopy(FTIR).The morphological appearance of the obtained nanoparticles was in the shape of a sphere with a size range of 60-90 *** antimicrobial activity of the prepared nanoparticles was tested against several pathogenic bacteria and *** obtained results proved that the nanoparticles succeeded to affect all the tested microbes in the following order:Bacillus cereus ATCC6633>Pseudomonas aeruginosa ATCC9027=Klebsiella pneumoniae ATCC13883>Vibrio cholera ATCC700=Candida albicans ATCC 700=Escherichia coli NCTC10418>Staphylococcus aureus *** minimum inhibitory concentration(mIC)of the prepared nanoparticles varied among the tested microbes at range of 12 mg/ml and 25 mg/*** results encourage the application of prepared TiO_(2)-Ag nanoparticles for treatment of microbe-contaminated waters.

关键词： TiO_(2)-Ag nanoparticles Hydrothermal Antimicrobial activity Water treatment

Spectrophotometric Study for the Reaction of Pentoxifylline Hydrochloride with 1,2-Naphthoquinone-4-Sulphonate: Kinetics, mechanism and Application for Development of High-Throughput Kinetic microwell Assay for Pentoxifylline in Quality Control Laboratory

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American Journal of Analytical Chemistry 2016年第2期7卷 179-191页

作者： Ashraf m. mahmoud saad A. AlQahtani Department of Pharmaceutical Analytical Chemistry Faculty of Pharmacy Assiut University Assiut Egypt Department of Pharmaceutical Chemistry College of Pharmacy Najran University Najran Kingdom of Saudi Arabia Department of Clinical Pharmacy College of Pharmacy Najran University Najran Kingdom of Saudi Arabia

Spectrophotometric study was carried out, for the first time, to investigate the reaction between the vasodilator pentoxifylline hydrochloride (POX) and 1,2-naphthoquinone-4-sulphonate (NQS) reagent. The reaction occurs in alkaline medium to activate the nucleophilic substitution reaction producing an orange-colored product measured spectrophometrically at λmax 472 nm. The variables affecting the reaction were carefully studied and the conditions were optimized. The kinetics of the reaction was investigated and its activation energy was found to be 0.262 cal/mol. Owing to its low activation energy, the reaction proceeded easily and was successfully used for simple and rapid assay of POX. The stoichiometry of the reaction was determined (1:1), and the reaction mechanism was suggested. To develop a high-throughput methodology used in quality control laboratory, a comparative study of the reaction using the conventional spectrophotometric versus microwell assay was applied. Under the optimum reaction conditions, the initial rate and fixed time methods were utilized for constructing the calibration graphs for determination of POX concentrations. The linear range was 10 - 120 μg/ml with good correlation coefficients (0.9987 - 0.9998). The LOD was 2.5 and 3.4 μg/ml for initial rate and fixed time methods, respectively. The intra- and inter-day accuracy and precision of the developed methods were satisfactory, where RSD was ≤3.94%. The present methods have been successfully applied to the determination of POX in its pharmaceutical tablets, and the percentage recovery values were 97.9% - 101.9%. Therefore, we strongly recommend the proposed methods for determination of POX in quality control laboratories.

关键词： Pentoxifylline HCl 1 2-Naphthoquinone-4-Sulphonate Kinetic Spectrophotometry Pharmaceutical Analysis micro-Well Plate Reader

Effect of rare earth(Nd^(3+))metal doping on structural,morphological,optical and magnetic traits of Zn-mg nano-ferrites

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Journal of Rare Earths 2023年第11期41卷 1763-1770,I0004页

作者： Rohit Jasrotia Nisha Kumari Ritesh Verma Suman Sachin Kumar Godara Jahangeer Ahmed saad m.Alshehri Bidhan Pandit Sanjay Kumar Himanshi Shubham Sharma Kirti Pradip K.maji School of Physics&materials Science Shoolini University of Biotechnology and Management SciencesSolanHimachal Pradesh173229India Himalayan Centre of Excellence in Nanotechnology Shoolini UniversityBajholSolanH.P173229India Department of Physics Baddi University of Emerging Science and TechnologyMakhnumajraBaddiHimachal Pradesh173205India Department of Physics Amity University HaryanaGururgram122413India Department of mathematics School of Basic and Applied SciencesMaharaja Agrasen UniversityBaddiH.P174103India Department of Apparel and Textile Technology Guru Nanak Dev UniversityAmritsar143005India Department of Chemistry College of ScienceKing Saud UniversityP.O.Box 2455Riyadh11451Saudi Arabia Department of materials Science and Engineering and Chemical Engineering Universidad Carlos III de MadridAvenida de la Universidad 3028911LeganésMadridSpain School of Advanced Chemical Sciences Shoolini University of Biotechnology and Management SciencesSolanHimachal Pradesh173229India Dept.of Polymer&Process Engineering Indian Institute of Technology RoorkeeSaharanpurUttar Pradesh247001India

Herein,we report the synthesis of Zn_(0.7)mg_(0.3)Nd_(x)Fe_(2-x)O_(4)(where,x=0,0,0,01,0,02)ferrite nanoparticles by employing the sol-gel auto-combustion *** X-ray diffraction(XRD)pattern suggests the formation of a pure cubic structure,without any impurity phase,with an Fd3m space group at room *** increasing doping amount,the crystallite size is reported as 35-41 nm,while the lattice parameters rise from 0.8381 to 0.8395 *** emission scanning electron microscopy(FESEm)images show the formation of spherical grains with agglomerated morphology in all the samples,with grain sizes ranging from 49 to 103 *** dispersive X-ray spectroscopy(EDX)and elemental mapping investigation confirm the chemical purity of all the *** transform infrared(FTIR)analysis shows the presence of two prominent peaks around 440 and 560 cm^(-1)that correspond to the octahedral and tetrahedral *** addition,the existence of five Raman active vibratio nal modes in all produced specimens again confirms the structural purity of all the *** m-H curve shows that saturation magnetization(m_(s))first increases from 14.98 to 28.22 emu/g and then decreases to 18.98emu/g with increasing doping *** is due to the A-B type super-exchange interaction for the synthesized *** variation in coercivity(H_(c))and magnetic anisotropy(K_(1))suggest the thermal stability of all the samples and can be utilized in transformers and solenoids.

关键词： magnetic nanoparticles Saturation magnetization Sol-gel auto-combustion synthesis Super-exchange interaction Cubic crystal structure Rare earths

Prurigo Pigmentosa and Confluent and Reticulated Papillomatosis a Spectrum of One Disease: A New Case Report

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Journal of Cosmetics, Dermatological Sciences and Applications 2022年第1期12卷 22-32页

作者： Waqas saad Abdulwahhab muna m. Aldhuhoori Department of Dermatology and Venereology Al Qassimi Hospital Sharjah United Arab Emirates College of medicine University of Sharjah Sharjah United Arab Emirates

Background: Prurigo Pigmentosa (PP) is a rare inflammatory dermatitis first discovered in 1971. Characterized by a sudden eruption of pruritic reticulated, pink-brown papules coalescing into plaques distributed symmetrically over shoulders, neck, chest, and back. Various triggers have been identified, including the ketogenic diet. Clinicopathological presentation looks similar to confluent and reticulated papillomatosis (CARP) which is a rare dermatosis of unknown etiology characterized by hyperkeratotic pigmented papules & peripheral reticulation involving seborrheic areas. Aim: To document a new case presentation of PP caused by a low-carbohydrate restricted diet and discuss the comparison with CARP clinically, pathologically, and treatment modalities. Case report: A 15-year-old childhood male developed PP 3 weeks after self-initiating a low carbohydrate-restricted ketogenic diet for weight management. Clinically and histopathologically the lesion looks similar to CARP, treated successfully with re-introduction of high carbohydrates in his food, a short course of systemic steroids in combination with oral doxycycline capsules for the one-month duration. Conclusion: PP & CARP have been considered a spectrum of one disease, and PP is a pruritic variant from CARP caused by a low carbohydrate-restricted diet.

关键词： Prurigo Pigmentosa Ketogenic Diet Inflammatory Dermatosis Confluent and Reticulated Papillomatosis

System Variables Design of Safety Analysis for Fast Reactors

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World Journal of Nuclear Science and Technology 2023年第2期13卷 29-39页

作者： magdi Hassan saad Abdallah m. Ibrahim Department of Physics Faculty of Science Taibah University Al Madinah Al Munawwarah KSA Department of Physics Sudan University of Science & Technology Khartoum Sudan Department of Nuclear Engineering Sudan University of Science & Technology Khartoum Sudan

This research aims to examine the risk in the technology design of fast breeder reactors while the development depends on safety considerations. The project explored the variables, which could affect positively the expected average fuel burn-up, breeding ratio, and decay heat removal. That is accomplished using features such as guard vessels and elevated pipe routing to prevent the cracked state of both core components and fuel cladding interface conditions. So, the cracked region of fuel was detected by thermal-hydraulic analysis. We used ZrFeCr alloys to estimating of the rise in fuel cladding and coolant that can be incorporated in the design ZrFeCr alloys to uniform corrosion in temperature and 10.3 mpa pressure. Fast creep of the reactor vessel during the coolant heat-up transient is another issue to be considered corrosion resistance of structural material can be achieved by controlling oxygen content in steel alloy. In this trend, S4337 S5140 steels are wide and can be used in future fossil power plants because of their excellent high-temperature strength.

关键词： Reactor Safety Crack Temperature Safety management System

comparison between tocotrienol and omeprazole on gastric growth factors in stress-exposed rats

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World Journal of Gastroenterology 2017年第32期23卷 5887-5894页

作者： mohd Fahami Nur Azlina Hj mohd saad Qodriyah Kien Hui Chua Yusof Kamisah Department of Pharmacology Faculty of MedicineUniversiti Kebangsaan Malaysia Department of Physiology Faculty of MedicineUniversiti Kebangsaan Malaysia

AIm To investigate and compare the effects of tocotrienol and omeprazole on gastric growth factors in rats exposed to water-immersion restraint stress(WIRS).mETHODS Twenty-eight male Wistar rats were randomly assigned to four groups of seven rats. The two control groups were administered vitamin-free palm oil(vehicle) and the two treatment groups were given omeprazole(20 mg/kg) or tocotrienol(60 mg/kg) by oral gavage. After 28 d of treatment, rats from one control group and both treated groups were subjected to WIRS one time for 3.5 h. Gastric lesions were measured and gastric tissues were obtained to measure vascular endothelial growth factor(VEGF), epidermal growth factor(EGF), basic fibroblast growth factor(b FGF), and transforming growth factor-alpha(TGF-α) m RNA expression. RESULTS Rats exposed to WIRS for 3.5 h demonstrated the presence of considerable ulcers in the form of gastric erosion. The lesion index in the stressed control(S) group was increased(P mpared to the tocotrienol treated and omeprazole treated groups. Stress led to a decrease in gastric VEGF(P m RNA levels and caused an increase in EGF m RNA(P mpared to the nonstressed control group. Although both treatment agents exerted similar ulcer reducing ability, only treatment with tocotrienol led to increased expression of VEGF(P = 0.008), b FGF(P = 0.001) and TGF-α(P = 0.002) m *** Tocotrienol provides gastroprotective effects in WIRSinduced ulcers. Compared to omeprazole, tocotrienol exerts a similar protective effect, albeit through multiple mechanisms of protection, particularly through up-regulation of growth factors that assist in repair of gastric tissue injuries.

关键词： Tocotrienol Omeprazole Restraint-stress Gastric ulcers Growth factors

Strength Performance and microstructure Characteristic of Naturally-Bonded Fiberboard Composite from malaysian Bamboo(Bambusa vulgaris)

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Journal of Renewable materials 2022年第10期10卷 2581-2591页

作者： Shahril Anuar Bahari mohd Nazarudin Zakaria Syaiful Osman Falah Abu mohamad Jani saad Reza Hosseinpourpia Eco-Technology Program Faculty of Applied SciencesUniversiti Teknologi MARA(UiTM)Shah Alam40450Malaysia Engineering Research Centre Malaysian Agricultural Research and Development Institute(MARDI)Serdang43400Malaysia Department of Forestry and Wood Technology Linnaeus UniversityVäxjö35195Sweden

This study investigated the mechanical properties and microstructural characteristics of fiberboard composite produced by naturally-bonded malaysian bamboo fiber(Bambusa vulgaris).The components that obtained through soda pulping of bamboo culms such as fiber and black liquor,were used for the preparation of high-density fibreboard composite at two target densities of 850 and 950 kg/m^(3).The bamboo fiberboard composite(BFC)were then produced at 200°C and two pressing parameters of 125 and 175 s/*** mechanical properties,e.g.,flexural strength and internal bonding(IB)of BFC samples were evaluated according to BS EN 310:1993 and BS EN 319:1993,*** was found that the mechanical performance of the composite with 850 kg/m^(3)density was significantly higher than 950 kg/m^(3)ones,especially for the samples with 125 s/mm pressing *** characteristic of the BFC samples illustrated that the fiber linkages were cracked in the composites with higher density,e.g.,the composite with the density of 950 kg/m^(3)and also black liquor were slightly degraded at longer pressing time,which led to the reduction in mechanical properties,especially in IB strength.

关键词： Bamboo fiber naturally-bonded black liquor mechanical properties SEm composite

Disruption of orbitofrontal-hypothalamic projections in a murine ALS model and in human patients

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Translational Neurodegeneration 2021年第2期10卷 213-229页

作者： David Bayer Stefano Antonucci Hans-Peter muller Rami saad Luc Dupuis Volker Rasche Tobias m.Bockers Albert C.Ludolph Jan Kassubek Francesco Roselli Department of Neurology Ulm UniversityUlmGermany CEmmA(Cellular and molecular mechanisms in Aging)Research Training Group UlmGermany University of Strasbourg StrasbourgFrance Department of Internal medicine II Ulm University Medical CentreUlmGermany Institute of Anatomy and Cell Biology Ulm UniversityUlmGermany German Center for Neurodegenerative Diseases-DZNE UlmGermany

Background:Increased catabolism has recently been recognized as a clinical manifestation of amyotrophic lateral sclerosis(ALS).The hypothalamic systems have been shown to be involved in the metabolic dysfunction in ALS,but the exact extent of hypothalamic circuit alterations in ALS is yet to be *** we explored the integrity of large-scale cortico-hypothalamic circuits involved in energy homeostasis in murine models and in ALS ***:The rAAV2-based large-scale projection mapping and image analysis pipeline based on Wholebrain and Ilastik software suites were used to identify and quantify projections from the forebrain to the lateral hypothalamus in the SOD1(G93A)ALS mouse model(hypermetabolic)and the FusΔNLS ALS mouse model(normo-metabolic).3 T diffusion tensor imaging(DTI)-magnetic resonance imaging(mRI)was performed on 83 ALS and 65 control cases to investigate cortical projections to the lateral hypothalamus(LHA)in ***:Symptomatic SOD1(G93A)mice displayed an expansion of projections from agranular insula,ventrolateral orbitofrontal and secondary motor cortex to the *** findings were reproduced in an independent cohort by using a different analytic *** contrast,in the FusΔNLS ALS mouse model hypothalamic inputs from insula and orbitofrontal cortex were maintained while the projections from motor cortex were *** DTI-mRI data confirmed the disruption of the orbitofrontal-hypothalamic tract in ALS ***:This study provides converging murine and human data demonstrating the selective structural disruption of hypothalamic inputs in ALS as a promising factor contributing to the origin of the hypermetabolic phenotype.

关键词： rAAV2 Agranular insula Orbitofrontal cortex Lateral hypothalamus Hypermetabolism Amyotrophic lateral sclerosis