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Pancreatic pseudocyst or a cystic tumor of the pancreas?

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Chinese Journal of Cancer 2014年第2期33卷 87-95页

作者： Mohammad Ezzedien Rabie Ismail El Hakeem Mohammad Saad Al Skaini Ahmad El Hadad Salim Jamil Mian Tahir Shah mahmoud obaid Department of Surgery Armed Forces Hospital-Southern Region Department of Radiology Armed Forces Hospital-Southern Region Department of Pathology Armed Forces Hospital-Southern Region

Pancreatic pseudocysts are the most common cystic lesions of the pancreas and may complicate acute pancreatitis, chronic pancreatitis, or pancreatic trauma. While the majority of acute pseudocysts resolve spontaneously, few may require drainage. On the other hand, pancreatic cystic tumors, which usually require extirpation, may disguise as pseudocysts. Hence, the distinction between the two entities is crucial for a successful outcome. We conducted this study to highlight the fundamental differences between pancreatic pseudocysts and cystic tumors so that relevant management plans can be devised. We reviewed the data of patients with pancreatic cystic lesions that underwent intervention between June 2007 and December 2010 in our hospital. We identified 9 patients(5 males and 4 females) with a median age of 40 years(range, 30–70 years). Five patients had pseudocysts, 2 had cystic tumors, and 2 had diseases of undetermined pathology. Pancreatic pseudocysts were treated by pseudocystogastrostomy in 2 cases and percutaneous drainage in 3 cases. One case recurred after percutaneous drainage and required pseudocystogastrostomy. The true pancreatic cysts were serous cystadenoma, which was treated by distal pancreatectomy, and mucinous cystadenocarcinoma, which was initially treated by drainage, like a pseudocyst, and then by distal pancreatectomy when its true nature was revealed. We conclude that every effort should be exerted to distinguish between pancreatic pseudocysts and cystic tumors of the pancreas to avoid the serious misjudgement of draining rather than extirpating a pancreatic cystic tumor. Additionally, percutaneous drainage of a pancreatic pseudocyst is a useful adjunct that may substitute for surgical drainage.

关键词：急性胰腺炎囊肿假性肿瘤平均年龄引流治疗浆液性

Emerging trends of electrocatalytic technologies for renewable hydrogen energy from seawater:Recent advances,challenges,and techno-feasible assessment

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Journal of Energy Chemistry 2023年第5期80卷 658-688,I0014页

作者： obaid Fahad Aldosari Ijaz Hussain Zuhair Malaibari Department of Chemistry College of ScienceMajmaah UniversityP.O.Box 66Majmaah 11952Saudi Arabia Center for Refining&Advanced Chemicals King Fahd University of Petroleum&MineralsDhahran 31261Saudi Arabia Department of Chemical Engineering King Fahd University of Petroleum&MineralsDhahran 31261Saudi Arabia

Hydrogen has been regarded as a promising renewable and green energy source to meet energy needs and attain net-zero carbon *** electrolysis of seawater to make hydrogen is one of the fascinating developments of the twenty-first *** method uses abundant and relatively inexpensive seawater,as opposed to freshwater,which is rare and can be prohibitively *** recent years,significant research and advancements have been made in direct seawater electrolysis technology for hydrogen ***,producing highly effective and efficient electrocatalysts with long-term viability under harsh corrosive conditions remains a challenging and severe topic for large-scale seawater electrolysis *** is still a large accomplishment gap in understanding how to improve seawater electrolysis to increase hydrogen yields and prolong *** is,therefore,crucial to have a condensed knowledge of the tunable and inherent interactions between various electrocatalysts,covering electrolyzer types and paying particular attention to those with high efficiency,chemical stability,and *** extensive discussion is structured into a progression from noble metals to base metal compounds such as oxides,alloys,phosphides,chalcogenides,hydroxides,and nitrides,MXene-based complexes with a concise examination of hybrid *** addition,proton exchange membranes,anion exchange membranes,alkaline water electrolyzers,and high-temperature water electrolyzers were potential contributors to seawater’s *** extensive assessment of the techno-feasibility,economic insights,and future suggestions was done to commercialize the most efficient electrocatalytic systems for hydrogen *** review is anticipated to provide academics,environmentalists,and industrial researchers with valuable ideas for constructing and modifying seawater-based electrocatalysts.

关键词： Seawater splitting Hydrogen production Electrolysis Electrocatalysts Electrolyzers Techno-feasible analysis Review

Injury severities from heavy vehicle accidents:An exploratory empirical analysis

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第6期9卷 991-1002页

作者： Hamsa Zubaidi Ali Alnedawi Ihsan obaid Masoud Ghodrat Abadi Roads and Transport Engineering Department College of EngineeringUniversity of Al-QadisiyahAl-DiwaniyaIraq Investment Commission Endowment BaghdadIraq Department of Civil Engineering California State UniversitySacramentoCA 95819USA

Despite the importance of heavy vehicles in Australia’s transportation system,little is known on the factors influencing injury severity from accidents involving a single heavy *** vehicular crashes have been one of the main causes of fatal injuries in Australia,and this raises safety concerns for transport authorities,insurance companies,and emergency *** there have been several potential attempts to identify the factors contributing to heavy vehicle crashes and injury severity,it is still necessary to reduce the number of traffic crashes and lower the fatality rate involving heavy *** aims of this study were investigating the effects of heavy trucks’presence in accidents on the injury severity level sustained by the vehicle driver and detecting the contributing factors that lead to specific injury severity ***-and random-parameter ordered probit and logit models were applied for predicting the likelihood of three injury severity categories severe,moderate,and no injury based on data from crashes caused by heavy trucks in Victoria,Australia in *** results showed that the random-parameter ordered probit model performed better than the other models *** variables(i.e.,factors)were found to be significant,and 12 of them were found to have random parameters that were normally *** some of the investigated factors had different effects on the type of injury severity in Australia,this paper does not recommend generalizing the findings from other case *** on the findings,Victoria state authorities can have insight and enhanced understanding of the specific factors that lead to various types of injury severity involving heavy ***,the safety of all road users,including heavy vehicle drivers,can be enhanced.

关键词： Heavy vehicle Injury severity Random parameter Ordered probit model

Floristics and soil characteristics of Ohud mountain,AlMadinah Al-Munawarah,Western Saudi Arabia

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Journal of Mountain Science 2020年第10期17卷 2405-2417页

作者： Wael A.obaid Tahar BOUTRAA Usama K.ABDEL-HAMEED Biology Department College of ScienceTaibah UniversityAl-Madinah Al-Munawarah42353Saudi Arabia Botany Department Faculty of ScienceAin Shams UniversityCairo11566Egypt

Ohud mountain is one of the main important historic sites in the Arab Peninsula,and it is distinguishable over the rest of the mountains in the *** extensive floristic survey has been carried out on Ohud mountain because of the rugged topography of this *** current study investigates the floristic diversity and the correspondence of environmental factors of the phytogeographical distribution of plants,based on the floristic analysis of the present *** research question is about the relationships between the species diversity and the human impacts of populated area at lowlands around Ohud mountain.A total of 59 species belonging to 56 genera and 28 families were *** had the highest contribution,about 12%of the total plant *** analysis of the life forms demonstrated the prevalence of therophytes(68%)followed by chamaephytes(24%),indicating the adaptation of these life forms to hyperarid *** chorological analysis indicated the predominance of the bi-regional taxa over the other *** of the recorded plant species belong to Saharo-Arabian and Sudano-Zambezian(24%)*** analysis was performed to detect the indicator species of different vegetation groups and confirmed by detrended correspondence analysis(DCA or DECORANA).It is concluded that species richness and diversity revealed clear variation along the mountain and among the studied *** species diversity and richness were more pronounced in the intermediate portion of the elevation gradients across the mountain,with a decrease in the high altitudinal *** decrease was also recorded at the lower altitudes,where human impacts clearly affected vegetation;leading to a decrease in alpha *** addition,the beta diversity among moderately highlands and lowlands was considerably high indicating the heterogeneous species composition among the studied sites along mountain *** general pattern of vegetation groups di

关键词： Flora Life forms Chorology Environmental variables Biodiversity indices

GABA UPTAKE BY GAT1 MODULATES LONG-TERM OPTICAL CHANGES FOLLOWING ELECTRICAL STIMULATION OF THE PITUITARY GLAND NEUROINTERMEDIATE LOBE

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Journal of Innovative Optical Health Sciences 2013年第3期6卷 46-57页

作者： P.KOSTERIN A.L.obaid B.M.SALZBERG Department of Neuroscience Perelman School of Medicine University of Pennsylvania Philadelphia PA 19104 Department of Physiology Perelman School of Medicine University of Pennsylvania Philadelphia PA 19104

Intrinsic optical changes that follow infundibular stalk stimulation of the neurointermediate lobe of the mouse pituitary gland exhibit three different phases that reflect three distinct physiological *** first(E-wave)is the rapid light-scattering increase that is associated with a nerve terminal volume increase(mechanical spike),and that accompanies excitation of the neurohy-pophysial terminals by the invading action potential;the second(S-wave)is the slower light-scattering decrease that is tightly corelated with the secretion of the peptide hormones oxytocin and arginine vasopressin,and the third is the long duration response(R-wave)that reflects cell volume changes in the pars *** have studied the E-wave and the S-wave in earlier *** R-wave,considered here,is sensitive to chloride replacement as wel as to blockade of chloride *** blocking GABAA reeptors(which are ligand gated chloride channels)with pharrmacological agents,and by applying GABA directly into the bathing solution,or evoking its release from GABAergic inputs,we have demonstrated that this long-duration optical response is sensitive to chloride movements and reflects GABA-induced changes in the intrinsic optical propertis of the pars *** full time course of this optical response takes mimutes and,therefore,has to embody some other process(or processes)related to the restoration of resting physiological chloride concentrations,following the opening and closing of GABA A-reeptor *** we demonstrate that the shape of the R wave,the longlasting light-scattering signal,is indeed affected by the activity of GAT1,one of the *** GA BA transporters.

关键词： Light scattering posterior pituitary pars nervosa neurohypophysis volume changes pars intermedic GABAA receptors

INTRINSIC FLUORESCENCE CHANGES IN NERVE TERMINALS,EVOKED BY ACTION POTENTIALS,ARE MODULATED BY KREBS CYCLE SUBSTRATES

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Journal of Innovative Optical Health Sciences 2011年第2期4卷 209-214页

作者： PAUL KOSTERIN ANA LIA obaid BRIAN M.SALZBERG Department of Neuroscience University of Pennsylvania School of Medicine Philadelphia PA 19104USA Department of Physiology University of Pennsylvania School of Medicine Philadelphia PA 19104USA

Electrical stimulation of the mammalian neurohypophysial infundibular stalk evokes the entry of Nat and Ca^(2+) into the neurosecretory terminals during the action *** events,in turn,increase intracellular Ca^(2+) and activate NaK-and Ca-ATPases,prompting the mitochondria to increase oxidative phosphorylation which can be monitored by recording the changes in FAD and *** paper reflects our efforts to determine whether or not modulating the capacity of mitochondria to produce ATP,by changing the concentrations of two important substrates of the Krebs cycle of the nerve terminal mitochondria,pyruvate and glucose,has an effect on the intrinsicfluorescence changes triggered by action potential stimulation.

关键词： Fluorescence FAD NADH action potential metabolism

Performance Analysis of Multi-Channel CR Enabled IoT Network with Better Energy Harvesting

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Computers, Materials & Continua 2022年第4期71卷 183-197页

作者： Afiya Kiran Ahmad Karim Yasser obaid Alharbi Diaa Mohammed Uliyan Department of Computer Science BZ UniversityMultan6000Pakistan Department of Information Technology BZ UniversityMultanPakistan College of Computer Science and Engineering University of Ha’ilHailSaudi Arabia

Wireless Sensor Networks(WSNs)can be termed as an autoconfigured and infrastructure-less wireless networks to monitor physical or environmental conditions,such as temperature,sound,vibration,pressure and motion *** may comprise thousands of Internet of Things(IoT)devices to sense and collect data from its surrounding,process the data and take an automated and mechanized *** the other side the proliferation of these devices will soon cause radio spectrum ***,to facilitate these networks,we integrate Cognitive Radio(CR)functionality in these *** can sense the unutilized spectrum of licensed users and then use these empty bands when *** order to keep the IoT nodes functional all time,continuous energy is *** this reason the energy harvested techniques are preferred in IoT *** it is preferred to harvest Radio Frequency(RF)energy in the *** this paper a region based multi-channel architecture is *** which the coverage area of primary node is divided as Energy Harvesting Region and Communication *** Secondary User(SU)that are the licensed user is IoT enabled with Cognitive Radio(CR)techniques so we call it CR-enabled IoT node/device and is encouraged to harvest energy by utilizing radio frequency *** harvest energy efficiently and to reduce the energy consumption during sensing,the concept of overlapping region is given that supports to sense multiple channels simultaneously and help the SU to find best channel for transmitting data or to harvest energy from the ideal *** the experimental analysis,it is proved that SU can harvest more energy in overlapping region and this architecture proves to consume less energy during data transmission as compared to single *** also show that channel load can be highly reduced and channel utilization is proved to be more ***,this proves the proposed architecture cost-effective and energy-efficient.

关键词： Wireless sensor network multi-channel sensing energy harvesting cognitive radio IoT network

Frequency control of future power systems: reviewing and evaluating challenges and new control methods

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Journal of Modern Power Systems and Clean Energy 2019年第1期7卷 9-25页

作者： Zeyad Assi obaid Liana M.CIPCIGAN Lahieb ABRAHIM Mazin T.MUHSSIN College of Engineering University of Diyala Institute of Energy School of Engineering Cardiff University School of Engineering South Wales University College of Engineering Mustansiriyah University

Integration of more renewable energy resources introduces a challenge in frequency control of future power *** paper reviews and evaluates the possible challenges and the new control methods of frequency in future power *** types of loads and distributed energy resources(DERs) are reviewed.A model representation of a population of the water heater devices for the demand side frequency response is considered.A model representation of a population of battery energy storage system(BESS)-based DERs such as smart electric vehicles(EVs) charging, large-scale BESSs, and residential and non-residential BESSs, are *** simplified Great Britain power system and the 14-machine South-East Australian power system were used to demonstrate the effectiveness of the new methods in controlling power system frequency following a *** new methods are effective in recovering the fallen frequency response and present a great potential in controlling the frequency in future power systems.

关键词： Battery energy storage system(BESS) Distributed energy resource(DER) Electric vehicle Home-based BESS Large-scale BESS aggregation Demand side response Frequency control Markov chain

Analysis of an HIV model with distributed delay and behavior change

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International Journal of Biomathematics 2015年第2期8卷 53-75页

作者： Hasim A. obaid Rachid Ouifki Kailash C. Patidar Department of Mathematics and Applied Mathematics University of the Western Cape Private Bag X17 Bellville 7535 South Africa DST/NRF Centre of Excellence in Epidemiological Modelling and Analysis Stellenbosch University Stellenbosch 7600 South Africa

We develop and analyze a mathematical model for the transmission dynamics of HIV that accounts for behavioral change. The contact rate is modeled by a decreasing function （response function） of HIV prevalence to reflect a reduction in risky behavior that results from the awareness of individuals to a higher HIV prevalence. The model also includes a distributed delay representing the time needed for individuals to reduce their risky behavior. We study mathematically and numerically the impact of the response function and the distributed delay on the model＇s dynamics. Threshold values for the delay at which the system destabilizes and periodic solutions can arise through Hopf bifurcation are determined.

关键词： HIV distributed delay basic reproduction number equilibrium stability Hopf bifurcation.