Taizz, Yemen
Taizz, Yemen

Template:Wikipedia:Articles for creation/Daily headerTaiz University was founded in Yemen, Taiz, on April 19, 1993 and opened on October 11, 1995.The university consists of 8 colleges and 5 Science centres. Wikipedia.

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Introduction: Breast cancer is the most common cancer among women. Though there is an annual increase in its incidence, the mortality remained relatively stable, probably reflecting the combined benefits of early detection and better treatment. During the 1980s, large randomized clinical trials had shown that breast conservative therapy became the treatment of choice for early breast cancer. Several risk factors for local recurrence after breast conservative surgery have been recognized: margin status, young age and other. The objective of the study was to assess the effect of age and safety margin on local recurrence and survival after breast conservative surgery for early breast cancer. Material and method: The study included 200 female patients admitted to the Al Amal Oncology Center, Yemen, with the diagnosis of early breast carcinoma (stage I, ID, between January 2012 and December 2016, and treated with breast conservative surgery. Results: The result of our study showed that 53 (26.5%) of female patients were ≤ 40 year-old, while 147 (73.5%) were > 40 year-old. 14 patients (7%) had recurrent ipsilateral breast tumor in this study. Regarding safety margin (SM), 190 patients had negative margin, 4 patients close margin and 6 patients were with positive margin. The five year overall survival rate in patients < 40 year-old was 80.4%, while in patients > 40 year-old was 87.1%. The five year overall survival rate in patients with (+)ve SM was 53.3%, 75% in those with close margin and 86.5% in those with (-)ve margin, which was significantly higher than (+) ve or close SM (p =0.001). Conclusion: In this study, we found that age and safety margin were independent riskfactors for local recurrence and survival. Copyright © 2017 Balkan Medical Union.

Hakimi M.H.,Taiz University | Abdullah W.H.,University of Malaya
Marine and Petroleum Geology | Year: 2014

The Upper Cretaceous Mukalla coals and other organic-rich sediments which are widely exposed in the Jiza-Qamar Basin and believed to be a major source rocks, were analysed using organic geochemistry and petrology. The total organic carbon (TOC) contents of the Mukalla source rocks range from 0.72 to 79.90% with an average TOC value of 21.50%. The coals and coaly shale sediments are relatively higher in organic richness, consistent with source rocks generative potential. The samples analysed have vitrinite reflectance in the range of 0.84-1.10 %Ro and pyrolysis Tmax in the range of 432-454°C indicate that the Mukalla source rocks contain mature to late mature organic matter. Good oil-generating potential is anticipated from the coals and coaly shale sediments with high hydrogen indices (250-449mg HC/g TOC). This is supported by their significant amounts of oil-liptinite macerals are present in these coals and coaly shale sediments and Py-GC (S2) pyrograms with n-alkane/alkene doublets extending beyond nC30. The shales are dominated by Type III kerogen (HI<200mg HC/g TOC), and are thus considered to be gas-prone.One-dimensional basin modelling was performed to analysis the hydrocarbon generation and expulsion history of the Mukalla source rocks in the Jiza-Qamar Basin based on the reconstruction of the burial/thermal maturity histories in order to improve our understanding of the of hydrocarbon generation potential of the Mukalla source rocks. Calibration of the model with measured vitrinite reflectance (Ro) and borehole temperature data indicates that the present-day heat flow in the Jiza-Qamar Basin varies from 45.0mW/m2 to 70.0mW/m2 and the paleo-heat flow increased from 80Ma to 25Ma, reached a peak heat-flow values of approximately 70.0mW/m2 at 25Ma and then decreased exponentially from 25Ma to present-day. The peak paleo-heat flow is explained by the Gulf of Aden and Red Sea Tertiary rifting during Oligocene-Middle Miocene, which has a considerable influence on the thermal maturity of the Mukalla source rocks. The source rocks of the Mukalla Formation are presently in a stage of oil and condensate generation with maturity from 0.50% to 1.10% Ro. Oil generation (0.5% Ro) in the Mukalla source rocks began from about 61Ma to 54Ma and the peak hydrocarbon generation (1.0% Ro) occurred approximately from 25 Ma to 20Ma. The modelled hydrocarbon expulsion evolution suggested that the timing of hydrocarbon expulsion from the Mukalla source rocks began from 15Ma to present-day. © 2013 Elsevier Ltd.

Numan N.,Taiz University
World Journal of Medical Sciences | Year: 2012

The leaves of the plant khat (Catha edulis) are commonly chewed in Arabian Peninsula and certain countries of the East Africa. The leaves of which are chewed for largely cultural and stimulant reasons. In this paper, a review of the scientific literatures on the relationship between khat use and psychosis and potentiality of dependence. To understand khat use, it is needed to discuss khat phenomenon through khat sitting to give a more real impression of the khat sitting at the level of the place, participants and social activity. Scientific papers quoted in this paper were identified by Pub Med, cross referencing missing references from the bibliographies of relevant papers. © IDOSI Publications, 2012.

Green analytical methods using Cisapride (CPE) as green analytical reagent was investigated in this work. Rapid, simple, and sensitive spectrophotometric methods for the determination of bromate in water sample, bread and flour additives were developed. The proposed methods based on the oxidative coupling between phenoxazine and Cisapride in the presence of bromate to form red colored product with max at 520 nm. Phenoxazine and Cisapride and its reaction products were found to be environmentally friendly under the optimum experimental condition. The method obeys beers law in concentration range 0.11-4.00 g ml -1 and molar absorptivity 1.41 × 104 L mol -1 cm-1. All variables have been optimized and the presented reaction sequences were applied to the analysis of bromate in water, bread and flour additive samples. The performance of these method was evaluated in terms of Student's t-test and variance ratio F-test to find out the significance of proposed methods over the reference method. The combination of pharmaceutical drugs reagents with low concentration create some unique green chemical analyses. © 2012 Elsevier B.V. All rights reserved.

Shamsan Z.A.,Taiz University
2013 Saudi International Electronics, Communications and Photonics Conference, SIECPC 2013 | Year: 2013

Coexistence between IMT-Advanced system and existing digital broadcasting is a matter of considerable when operating in a same or adjacent frequency channel within the band 790-862 MHz, which is recently allocated for mobile IMT-Advanced Systems represented by LTE-Advanced system. This can cause intersystem interference that affects on the coexisting feasibility between LTE-Advanced and digital broadcasting Receiver. In this paper, an efficient, simplified and graphical scheme for spectral emission mask and interference power level is proposed to investigate different channel overlapping scenarios between the two systems. A range of significant factors such as bandwidth, propagation distance, losses due to clutter, and antenna discrimination losses that can affect on the compatibility feasibility of the two systems are employed. The results demonstrate that using co-channel may unworkable unless some intersystem interference mitigation techniques are applied. © 2013 IEEE.

Ali Ahmed A.,Taiz University | Ali Ahmed A.,King Abdulaziz University
Computer Networks | Year: 2013

Mobile wireless sensor network (MWSN) is a wireless ad hoc network that consists of a very large number of tiny sensor nodes communicating with each other in which sensor nodes are either equipped with motors for active mobility or attached to mobile objects for passive mobility. A real-time routing protocol for MWSN is an exciting area of research because messages in the network are delivered according to their end-to-end deadlines (packet lifetime) while sensor nodes are mobile. This paper proposes an enhanced real-time with load distribution (ERTLD) routing protocol for MWSN which is based on our previous routing protocol RTLD. ERTLD utilized corona mechanism and optimal forwarding metrics to forward the data packet in MWSN. It computes the optimal forwarding node based on RSSI, remaining battery level of sensor nodes and packet delay over one-hop. ERTLD ensures high packet delivery ratio and experiences minimum end-to-end delay in WSN and MWSN compared to baseline routing protocol. In this paper we consider a highly dynamic wireless sensor network system in which the sensor nodes and the base station (sink) are mobile. ERTLD has been successfully studied and verified through simulation experiment. © 2013 Elsevier B.V. All rights reserved.

An Upper Cretaceous succession has been penetrated at onshore well 16/U-1 in the Qamar Basin, eastern Republic of Yemen. The succession comprises the Mukalla and Dabut Formations which are composed of argillaceous carbonates and sandstones with coal layers, and TOC contents range up to 80%. The average TOC of the Mukalla Formation (24%) is higher than that of the Dabut Formation (1%). The Mukalla Formation has a Rock-Eval Tmax of 439-454 °C and an HI of up to 374 mgHC/gTOC, pointing to kerogen Types II and III. The Dabut Formation mainly contains kerogen Type III with a Tmax of 427-456°C and HI of up to 152 mgHC/gTOC. Vitrinite reflectance values ranging between 0.3 and 1.0% and thermal alteration index values between 3 and 6 indicate thermal maturities sufficient for hydrocarbon generation.Three palynofacies types were identified representing marine, fluvial-deltaic and marginal-marine environments during the deposition of the Mukalla and Dabut Formations in the late Santonian - early Maastrichtian. © 2010 The Authors. Journal of Petroleum Geology © 2010 Scientific Press Ltd.

Subsurface Late Cretaceous succession has been recovered from 16/G-1, an offshore exploratory well that located in the Qamar Basin, eastern Republic of Yemen. This paper deals with the study of source rocks, maturation, hydrocarbon evaluation, and palynofacies of the Late Cretaceous Mukalla and Dabut Formations of the Mahra Group. These two formations consist of an intercalation of argillaceous, carbonates, siltstones, sandstones and coal layers. The sedimentary organic matter as amorphous organic matter, phytoclasts and palynomorphs are investigated and identified under transmitted light microscope. Spores, pollen, dinoflagellates, algae, fungi, and acritarchs in addition to foraminiferal lining test have been also identified. The optical and organic geochemical studies were used to evaluate the source rock, maturation and its hydrocarbons potentiality. The thermal alteration index, vitrinite reflectance, rock-eval pyrolysis, and palynofacies were also used. The upward increase in the relative abundance of marine versus terrestrial input reflects a major marine transgression and retregration cycles from Campanian to Maastrichtian stages. The Mukalla and Dabut Formations are late immature to mature stages with kerogen types II and III. The hydrocarbons generation potentiality of two formations is oil and wet gas prone indicators. © Saudi Society for Geosciences 2010.

Hakimi M.H.,Taiz University | Abdullah W.H.,University of Malaya
Organic Geochemistry | Year: 2013

The organic rich Safer shales exposed in the north-central part of onshore Marib-Shabowah Basin are evaluated and their depositional environments are interpreted. Total organic carbon contents (TOC) of the shales range from 1.02-16.8wt%, and yield hydrogen index (HI) values ranging from 130 to 820mgHC/g TOC, consistent with mainly Type II with minor contributions from Type I and mixed Types II-III kerogens. The Safer shale samples have vitrinite reflectance values in the range of 0.5-1.0 Ro%, indicating early mature to peak mature stage for oil generation. Tmax values range from 429-438°C, which are in reasonably good agreement with vitrinite reflectance data. Kerogen microscopy shows that the Safer shales are characterized by high amounts of organic matter, consisting predominantly of yellow fluorescing amorphous organic matter and alginite of marine origin. This is supported by their high content of hydrogen rich Type II and I oil-prone kerogen.The biomarker distributions of the Upper Jurassic Safer extracts are characterized by dominant low to medium molecular weight compounds (n-C14 to n-C20), low Pr/Ph ratio (<1.0), high phytane/n-C18 ratios (0.82-2.68), and predominant regular sterane C27. All biomarker parameters clearly indicate that the organic matter was derived from marine algal inputs and deposited under anoxic (reducing) conditions. Hypersaline conditions also prevailed during deposition of these sediments, as indicated by the presence of gammacerane. © 2012 Elsevier Ltd.

Hakimi M.H.,Taiz University | Abdullah W.H.,University of Malaya
Marine and Petroleum Geology | Year: 2013

The Marib-Shabowah Basin is an important hydrocarbon province in western Yemen, but the origin of hydrocarbons is not fully understood. In this regard, geochemical characteristics are used to provide information on source organic matter input, depositional environment and the correlation between crude oils from different pay zones. Two oil families are present within the study area and classified based on biomarker and non-biomarker parameters. The family I oils are characterized by low API gravity, high sulfur and trace metal (Ni, V) contents and low Ph/Ph ratio <1.0. These oils were derived from an alga organic matter that was deposited in a highly anoxic, hypersaline marine depositional environment and generated at low maturity.Family II oils have medium to high API gravity, low sulfur and trace metal contents and relatively high Pr/Ph ratios (1.09-1.59). The family II oils were derived from mixed marine and terrigenous organic matter and deposited under sub-oxic conditions. These oils were generated from source rocks with a wide range of thermal maturity ranging from early to peak oil window. The oil characteristics suggest that family I oils may be derived from the Tithonian age Safer calcareous shales and family II oils from the deeper Kimmeridgian Madbi shales. © 2013 Elsevier Ltd.

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