Impact of Gas Desorption on Production from Multiply Fractured Horizontal Well in Shale

In recent years, the exploitation of unconventional gas reservoirs has become increasingly important to North American energy supply. Unconventional gas development depends on effective stimulation of low permeability reservoir by creating multiple hydraulic fractures which connects massive reservoir area to the wellbore. Hydraulic fracturing and horizontal drilling are primary techniques to obtain economical production from the shale gas reservoir. In addition to that, gas desorption can be a significant source of gas production in shale gas reservoirs.;This research will illustrate the impact of gas desorption on production from multiply fractured horizontal well in shale by using a reservoir model. This research investigates the impact of reservoir and fracture characteristic on gas desorption from shale gas reservoir.;A commercial reservoir simulator was utilized to model a single porosity reservoir with number of layers. The results were used to evaluate the impact of gas desorption and investigate the impact of reservoir and hydraulic fracture characteristic on production performance in low permeability reservoir

Reproductive biology of the Golden grey mullet Liza aurata, in the Gulf of Gabes (central Mediterranean, Tunisia) in the Gulf of Gabes (central Mediterranean, Tunisia)

In spite of its high commercial value, very few information are available on the biological feature of the Golden grey mullet in Tunisian waters (central Mediterranean). These data would be of great help in identifying the current stock state. In this study, Gonado Somatic Index (GSI), Hepato Somatic Index (HSI), condition factor (K), Length at first sexual maturity TL50 was calculated and the fecundity was estimated using the volumetric method. The Gonado Somatic Index (GSI) indicated that the spawning season of the Golden grey mullet extends from October to December. The monthly variation of Hepato-Somatic Index (HSI) indicates that L. aurata saves lipid reserves in liver. The species is sexually mature at 23.73, 23.84 and 23.79 cm TL respectively for female, male and combined sexes. In the present study the sex-ratio was unbalanced, with females dominating among large size individuals (TL > 24 cm). Absolute fecundity with a mean value of 286564 varied from a minimum of 210400 eggs for age 4 and a maximum of 533600 for age 7+

USING CONE-BEAM COMPUTED TOMOGRAPHY TO EVALUATE APICAL TRANSPORTATION AND CENTERING ABILITY OF WAVEONE, ONESHAPE AND TORNADO ROTARY SYSTEMS: A CLINICAL STUDY

This clinical study was aimed to evaluate apical transportation and centering ability of WaveOne, OneShape files and Tornado rotary system using Cone-beam computed tomography (CBCT). Lower molars with a curving angle of buccal canals extending from 15°-45° in 24 patients were arbitrarily divided into three groups (n=8) rendering to the rotary systems used: Group 1, Tornado system, Group 2, WaveOne rotary system, and Group 3, OneShape rotary system. CBCT was used as a diagnostic method to evaluate centering ratio and canal transportation at 2, 5 and 8 mm from apical foramen. One-way analysis of variance and post hoc Tukey tests were used for statistical analysis at p≤0.05. No statistically significant difference in the magnitude of transportation and centering ability was found at all tested levels (P\u3e0.05). WaveOne and OneShape nickel-titanium files and Tornado stainless-steel file conserved the original canal curvature with no significant variance

An effective mass theorem for the bidimensional electron gas in a strong magnetic field

We study the limiting behavior of a singularly perturbed Schr\"odinger-Poisson system describing a 3-dimensional electron gas strongly confined in the vicinity of a plane $(x,y)$ and subject to a strong uniform magnetic field in the plane of the gas. The coupled effects of the confinement and of the magnetic field induce fast oscillations in time that need to be averaged out. We obtain at the limit a system of 2-dimensional Schr\"odinger equations in the plane $(x,y)$, coupled through an effective selfconsistent electrical potential. In the direction perpendicular to the magnetic field, the electron mass is modified by the field, as the result of an averaging of the cyclotron motion. The main tools of the analysis are the adaptation of the second order long-time averaging theory of ODEs to our PDEs context, and the use of a Sobolev scale adapted to the confinement operator

Genetic and Non-Genetic Factors Association with Warfarin Long Term Therapy Stability in Sudan

Anticoagulation with warfarin is characterized by a wide inter-individual variations in dose requirements and INR (International Normalised Ratio) stability, as there are evidences that warfarin response variability is associated with CYP2C9 (cytochrome P450, family 2, subfamily C, polypeptide 9) and VKORC1 (Vitamin K epoxide reductase complex1) genetic polymorphisms. Carriers of CYP2C9*2 and VKORC11639G>A variant alleles are at greater risk of unstable anticoagulation therapy. Objectives: This retrospective case control study was directed to analyze the impact of genetic and non-genetic factors on warfarin therapy in Sudanese out-patients who were on long term warfarin therapy. Method: 118 Sudanese outpatients receiving warfarin treatment for at least six months, were interviewed for their non-genetic factors that included age, sex, indication for warfarin therapy, compliance, Vitamin K rich foods intake and concomitant drug therapy, in addition to their blood samples which were taken for DNA extraction and genotyping of CYP2C9*2 and VKORC11639G>A gene polymorphisms to study the genetic factors. INR stability % index was calculated, accordingly patients were classified into 2 groups, stable and unstable groups. Results: The frequencies of VKORC11639G>A alleles in Sudanese out-patients who were on long term warfarin therapy were 70.3% and 29.7% for the VKORC1/G and VKORC1/A alleles respectively. The frequencies of CYP2C9*2 alleles in Sudanese out-patients were 92.4% and 7.6% for CYP2C9*1 and CYP2C9*2 alleles respectively. Variables associated with low INR stability were VKCOR1/AA genotype (p-value = 0.028) and sex (p = 0.017). Variables that showed no association with INR stability were age (p-value = 0.259), compliance (p-value = 0.058). Vitamin K rich foods intake (p- value = 0.743), and mean stable warfarin dose (p-value = 0.439). Conclusion: Polymorphism in warfarin drug target gene VKORC1-11639G>A and sex are important elements of INR stability in Sudanese out- patients on long term warfarin therapy

The role of quality factors on learning management systems adoption from instructors' perspectives

Learning management systems have been largely used in universities for teaching, student learning, curriculum, and staff development. However, just providing higher education institutions with a learning management system does not guarantee a success. Quality assurance of these systems has become a central concern for practitioners, researchers, and system providers. In this context, this empirical research investigates quality factors that can contribute to learning management system adoption. In addition, the study developed a research model based on TAM and information systems success model by integrating associated quality indicators inclusive of system quality, service quality, information quality, and instructor quality. Quantitative data using questionnaire gathered from 365 lecturers in Palestine universities were inspected to evaluate the influence of various constructs on lecturers’ adoption of learning management systems using structural equation modeling analysis technique. The research findings show that information quality, system quality, service quality, and instructors’ quality can contribute to e-learning management system adoption with regards to their beliefs. This Research contributes positively to the limited literature on assessing the quality predictors of learning management system adoption

Tackling Fluid Overload in a High-transporter Diabetic Patient on Continuous Ambulatory Peritoneal Dialysis

Introduction: Diabetic patients on continuous ambulatory peritoneal dialysis (CAPD) are more prone to fluid overload than non-diabetic patients, but the use of hypertonic glucose solutions to improve their ultrafiltration (UF) may hamper their glycemic control. Maintaining euvolemia in such patients may be tricky and needs special care. Case report: A 72 year old diabetic and hypertensive patient presented with severe fluid overload shortly after initiation of CAPD despite producing more than one liter of urine per day. He only achieved modest ultrafiltration (UF) during the day, and had a negative UF during the long hypertonic night dwell. Peritoneal equilibration tests (PET) confirmed that he was a high transporter, and his weekly Kt/V was found to be 1.36. Since automated peritoneal dialysis (APD) is not yet available in Sudan, the PD prescription was modified to comprise five short cycles during the day, including two short hypertonic daytime dwells, and a dry abdomen at night. This approach succeeded in improving his fluid status, but required the addition of intra-peritoneal soluble insulin to his regular subcutaneous insulin in order to achieve acceptable blood sugar control. After 8 months his residual renal function (RRF) had declined remarkably and he began to suffer from intermittent fluid overload of variable degrees. Nevertheless, we managed to maintain him satisfactorily on CAPD for 14 months. Conclusion: Simple measures such as omitting the night dwell and using five short cycles during the day, including two short hypertonic dwells, can be effective in controlling fluid overload in diabetic patients who have a high transporter status. Key words: CAPD, diabetes mellitus, fluid overload, residual renal Functio

Effect of police training during the confinement period on some cardiopulmonary and hematological parameters in Khartoum, Sudan

Background: Pulmonary function tests (PFT) serve as a tool of health assessment and as a predictor of occupational fitness. Police officers must develop and maintain high levels of physical fitness for physical demanding tasks they perform. The training program starts with confinement of five to eight weeks according to the trainee. Previously it has been shown that the police students have better lung functions values compared to their civilian colleagues. In this study the effect of the confinement training on pulmonary function tests was investigated.Methods: Eighty one policemen trainee were randomly selected from a new batch in the faculty of police sciences and Law, the National Ribat University, Khartoum, Sudan at their starting confinement period. Subjects were medically fit with no history of Diabetes, Hypertension, Asthma or use of any long term medications. Pulmonary function tests (FVC, FEV1 and PEFR) were performed using a micro-plus spirometer. Blood pressure, pulse rate, and hemoglobin were measured. All these were repeated at the end of the confinement.Results: The age of participants ranged from 24 to 26 years. FVC, FEV1 and PEFR significantly increased after the confinement period. The blood pressure and the pulse significantly decreased. The weight of the participants decreased after the confinement but Hb significantly slightly increased.Conclusions: Regular police training during the confinement improved the pulmonary and cardiovascular reserve function