i Hassan

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Papers by i Hassan

Bacillus Circulans Peritonitis in a Patient Treated with CAPD

Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis, 2004

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Urinary stones in children in Zaria

Annals of Tropical Paediatrics, 1993

In a period of 16 years, 22 boys whose ages ranged from 10 months to 15 years were treated for st... more In a period of 16 years, 22 boys whose ages ranged from 10 months to 15 years were treated for stones occurring predominantly in the lower urinary tract. These boys represented 9.6/100,000 paediatric admissions, indicating the rarity of urinary stones in children in Zaria. Congenital obstructing lesions were present in 13 (59%) and the urine was infected in eight cases, most frequently by Klebsiella spp.

Outcome of incidental thyroid carcinoma in patients undergoing surgery for Graves' disease

Revista medico-chirurgicală̆ a Societă̆ţ̜ii de Medici ş̧i Naturaliş̧ti din Iaş̧i

Thyroid malignancy detected incidentally in patients who are operated for Graves'disease (GD)... more Thyroid malignancy detected incidentally in patients who are operated for Graves'disease (GD) has been reported at different rates. The aim of this study was to investigate the rate and outcome of incidental thyroid carcinoma in thyrotoxic GD patients managed by surgery in our institution. A retrospective study was performed on a consecutive series of 92 patients with GD operated between January 2000 and December 2006 in the Department of Surgery of the Philipps University, Marburg. All patients were identified via the central electronic patient registry. Incidence and outcome of thyroid carcinoma incidentally discovered in patients undergoing surgery for GD were analysed. 82.6% were females and 17.4 were males. Mean age at time of surgery was 41.6 years (range: 12-72). Mean hospital stay was 5 days (range: 1-21). Two (2.2%) of all patients had a papillary thyroid microcarcinoma. Tumour size was 3 mm and 5 mm. Multifocality and lymph node involvement were not detected. Following...

Studies of the genus Thymus. VIII. Comparison of the floral leaves and calyces of the various species of Thymus

American journal of pharmacy and the sciences supporting public health, 1958

Studies of the genus thymus. VI. Comparison of the diagnostic microscopical characteristics of Thymus hirsutus Bieb. and Thymus heterotrichus Griseb

American journal of pharmacy and the sciences supporting public health, 1958

Studies of the genus thymus. IV. Comparison of the diagnostic microscopical characteristics of Thymus capitatus Hoffmagg. and Link and Thymus striatus Vahl

American journal of pharmacy and the sciences supporting public health, 1958

Experimental Investigation of Double Rows Film Cooling on Vane Pressure Side

Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D, 2012

An experimental investigation has been performed to study the effect of hole shape and position o... more An experimental investigation has been performed to study the effect of hole shape and position on the cooling performance of a gas turbine stator. Two rows of laid-back fan-shaped holes are placed on the pressure side of a scaled vane in a two-dimensional cascade and compared with two identical rows of standard cylindrical exit. Both hole shapes have the same base diameter and were investigated at three different blowing ratios (1, 1.35, and 1.7) with the same coolant flow rate used in each case. The experiments are conducted for the first row of holes only, then for the second row only, and finally for both two rows together at a 0.9 density ratio. The mainstream inlet Reynolds number based on the true chord is 1.4E5 and the exit Mach number is 0.23. The local distributions of the heat transfer coefficient and film cooling effectiveness are obtained using a transient TLC technique. The second row of holes, with by a higher local radius of curvature, shows a 40% decrease in the coo...

The onset of gas pull-through during dual discharge from a stratified two-phase region: Theoretical analysis

Physics of Fluids, 2004

A theoretical analysis for the onset of gas pull-through (entrainment) during discharge from a st... more A theoretical analysis for the onset of gas pull-through (entrainment) during discharge from a stratified two-phase region through two vertically aligned side branches has been developed in this paper. Initially, a simplified point-sink model was developed, which was then followed by the acquisition of a more accurate finite-branch model. The prediction of the critical height at the onset of gas entrainment was found to be a function of the corresponding Froude number of each branch (Fr1 and Fr2), as well as the vertical distance between the centerlines of the two branches (L/d). The predicted values of the critical height were found to be consistent with the corresponding experimental data for different values of Fr1, Fr2 and L/d. From the basis of the present models, it was found that by increasing the flow through the lower branch, the critical height increases for all values of Fr1 and L/d. Furthermore, by increasing the vertical distance between the two branches, the effect of ...

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Successful treatment of solid-Pseudopapillary tumor of the pancreas with multiple liver metastases

Pancreatology, 2005

The solid-pseudopapillary tumor (SPT) is a very rare pancreatic neoplasm that predominantly affec... more The solid-pseudopapillary tumor (SPT) is a very rare pancreatic neoplasm that predominantly affects young females. About 450 cases have been described in the world literature and approximately 20% of the reported patients were children. The occurrence of SPT with distant metastases in children is extremely rare with only two previously reported cases. We now report a 16-year-old Asian girl with a large SPT and synchronous multiple liver metastases who was successfully treated in a 2-step strategy, including initial pylorus-preserving partial duodenopancreatectomy, right hemicolectomy, resection and allografting of the portal vein and secondary resection of 12 liver metastases. The patient is disease free after a follow-up of 18 months after resection of the primary tumor, suggesting that an aggressive surgical treatment might also be justifi ed for metastasized SPT.

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The Impact of Diagnosis and Symptoms on Quality of Life of Patients with Colorectal Disease. What Matters Most?

Journal of Surgical Research, 2011

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Trace element analysis by accelerator mass spectrometry

Journal of Radioanalytical and Nuclear Chemistry Articles, 1993

An Accelerator Mass Spectrometry (AMS) facility has been assembled at the University of North Tex... more An Accelerator Mass Spectrometry (AMS) facility has been assembled at the University of North Texas (UNT) in collaboration with Texas Instruments, Inc. The UNT AMS facility is used primarily for the high sensitivity determination of trace elements of stable isotopes in materials. Particle accelerators, in conjunction with magnetic (momentum/charge) and electrostatic (energy/charge) spectrometers and particle energy detectors, may be used to measure rare isotopes at concentrations as low as one part in 1012 or 101~ atoms/cm 3.

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Radionuclide dating and trace element analysis by accelerator mass spectrometry

Journal of Radioanalytical and Nuclear Chemistry Articles, 1992

Accelerator Mass Spectcrometry (AMS) is being used for both radionuclide dating and stable isotop... more Accelerator Mass Spectcrometry (AMS) is being used for both radionuclide dating and stable isotope trace element determination with limits of high sensitivity. The areas of applications of radionuclide AMS include oceanography, terrestrial studies, glaciology, hydrology, environmental studies, meteorology, archaeology, anthropology, analysis of crude oils, biomedical and materials sciences, etc. The techniques and applications of radionuclide AMS are reviewed. The applications of stable element AMS include the measurements of trace impurities in electronic and other materials. The techniques and applications of stable element AMS are discussed with particular emphasis on electronic materials such as St, GaAs, and HgCdTe. The design of the University of North Texas stable element AMS facility built in collaboration with Texas Instruments Incorporated is discussed.

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Optimizing Sowing Date and Row Spacing for Newly Evolved Sesame (Sesamum indicum L.) Variety TH-6

Sesame (Sesamum indicum L.) is one of the important oil seed crops of Pakistan. The seed of sesam... more

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Excess mortality, length of stay and cost attributable to candidaemia

Journal of Infection, 2009

Background: There were 1967 reports of Candida species isolated from blood specimens in 2007 in t... more Background: There were 1967 reports of Candida species isolated from blood specimens in 2007 in the UK (excluding Scotland). Such infections are particularly common in the intensive care unit (ICU). The impact of candidaemia on mortality, length of stay (LOS) and cost in a UK hospital was examined. Methods: A retrospective analysis of candidaemia episodes and appropriate matched controls was undertaken based on data from the ICU, high dependency units and hospital wards at Wythenshawe Hospital in Manchester. The study covered the period November 2003eFebruary 2007. Results: In total, 48 case-patients of candidaemia and 81 control-patients were identified. The attributable mortality due to candidaemia varied from 21.5% to 34.7%. Candidaemia patients spend on average 5.6 days more in the ICU than matched patients and generate mean additional costs of at least £8252 per patient, £16,595 in adults only. Conclusion: Candidaemia remains a severe disease associated with high attributable mortality in the UK. In addition, candidaemia leads to additional ICU length of stay and costs. The implication is an attributable cost of at least £16.2 million with 683 deaths attributable to candidaemia per year in the UK.

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Analytical Modeling of Annular Flow Boiling Heat Transfer in Mini- and Microchannel Heat Sinks

Journal of Heat Transfer, 2010

An analytical model is proposed to predict the flow boiling heat transfer coefficient in the annu... more An analytical model is proposed to predict the flow boiling heat transfer coefficient in the annular flow regime in mini- and microchannel heat sinks based on the separated model. The modeling procedure includes a formulation for determining the heat transfer coefficient based on the wall shear stress and the local thermophysical characteristics of the fluid based on the Reynolds’ analogy. The frictional and acceleration pressure gradients within the channel are incorporated into the present model to provide a better representation of the flow conditions. The model is validated against collected data sets from the literature produced by different authors under different experimental conditions, different fluids, and with mini- and microchannels of hydraulic diameters falling within the range of 92–1440 μm. The accuracy between the experimental and predicted results is achieved with a mean absolute error of 10%. The present analytical model can correctly predict the different trends ...

Experimental Flow-Field Investigations Downstream a Scaled-Up Micro-Tangential-Jet Scheme Using the Particle Image Velocimetry Technique

Journal of Fluids Engineering, 2014

This paper presents experimental investigations of the flow-field characteristics downstream a Sc... more This paper presents experimental investigations of the flow-field characteristics downstream a Scaled-Up Micro-Tangential-Jet (SUMTJ) film-cooling scheme using the particle image velocimetry (PIV) technique over a flat plate. The SUMTJ scheme is a shaped scheme designed so that the secondary jet is supplied tangentially to the surface. The scheme combines the thermal benefits of tangential injection and the enhanced material strength of discrete holes’ schemes compared with continuous slot schemes. The flow-field characteristics downstream one row of holes were investigated at three blowing ratios, 0.5, 1.0, and 1.5, and were calculated based on the scheme exit area. A density ratio of unity, a Reynolds number of 1.16 × 105, and an average turbulence intensity of 8% were used throughout the investigations. The performance of the SUMTJ scheme was compared to that of the circular hole scheme, base line case case, at the same test conditions and blowing ratios. From the investigations,...

DSMC Simulation of Subsonic Flows in Parallel and Series Microchannels

Journal of Fluids Engineering, 2006

Flows in uniform, parallel, and series microchannels have been investigated using the direct simu... more Flows in uniform, parallel, and series microchannels have been investigated using the direct simulation Monte Carlo (DSMC) method. For the uniform microchannel cases, at higher pressure ratio, mixed Kn-regime flows were observed, where the Knudsen number (Kn) varies from below 0.1 to above 0.1. Also, the higher pressure ratio makes the flow accelerate more as the flow develops through the uniform microchannel. In order to examine the heat transfer characteristics between the wall and the bulk flow, a linear temperature distribution was imposed on the wall. Most of the wall heat flux occurs within the channel entrance region while it remains a constant with a slight magnitude along the rest of the channel wall. For the series microchannel cases, the computational domain was established by adding three surfaces and excluding one region from the rectangular domain. Diffuse effects were observed near the interface of the two segments, where the flow upstream the interface can be either ...

Numerical Investigation of Multistage Viscous Micropump Configurations

Journal of Fluids Engineering, 2005

The viscous micropump consists of a cylinder placed eccentrically inside a microchannel, where th... more The viscous micropump consists of a cylinder placed eccentrically inside a microchannel, where the rotor axis is perpendicular to the channel axis. When the cylinder rotates, a net force is transferred to the fluid because of the unequal shear stresses on the upper and lower surfaces of the rotor. Consequently, this causes the surrounding fluid in the channel to displace toward the microchannel outlet. The simplicity of the viscous micropump renders it ideal for micropumping; however, previous studies have shown that its performance is still less than what is required for various applications. The performance of the viscous micropump, in terms of flow rate and pressure capabilities, may be enhanced by implementing more than one rotor into the configuration either horizontally or vertically oriented relative to each other. This is analogous to connecting multiple pumps in parallel or in series. The present study will numerically investigate the performance of various configurations o...

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Assessment of pain associated with medical abortion

International Journal of Gynecology & Obstetrics, 2003

Lower abdominal pains and cramps are known side effects of medical abortion and they often cause ... more Lower abdominal pains and cramps are known side effects of medical abortion and they often cause significant distress. Although there has been considerable improvement in abortion care programs around the world pain management has remained a significant challenge. Women are often treated with no pain relief or receive inadequate pain control. Reported reasons for not providing effective pain relief are lack of availability of drugs and inadequate training and/or skills of providers. Other possible factors are lack of proper pain assessment and understanding the factors that may influence it. The aim of this work was to assess the reported severity of the pain associated with medical abortion and the possible related factors. (excerpt)