Papers by Syed Muhammad Taha Hussaini Hussaini
The International Journal of Advanced Manufacturing Technology, 2014
ABSTRACT In this paper, the effect of friction stir welding (FSW) parameters on wear and deformat... more ABSTRACT In this paper, the effect of friction stir welding (FSW) parameters on wear and deformation behavior of tungsten carbide (WC) tool employed in the welding of AISI 304 austenitic stainless steel (SS) is reported. In addition, the wear and deformation of the tool are also characterized. Three FSW parameters, namely shoulder diameter, tool rpm, and traverse speed each at three levels were considered. Experiments were performed as per Taguchi's L-9 orthogonal array to investigate the effect of these parameters on wear and plastic deformation of the tool. Wear at the pin root and bottom face of the pin attributed to diffusion and attrition mechanisms, respectively, were observed. Significant deformation of the tool was also observed during welding which caused bulging of the shoulder with an increased cone angle of the pin.
Procedia Materials Science, 2014
Discontinuous plastic flow in metals referred to as dynamic strain aging. These DSA appears durin... more Discontinuous plastic flow in metals referred to as dynamic strain aging. These DSA appears during the plastic deformation of the metallic materials under certain temperatures and strain rates. Present work is aimed to find the best available material model for simulations of deep drawing in DSA region. The limiting drawing ratio and thickness distribution of drawn cup are the indicators of formability in deep drawing. Thickness distribution of the simulated cup at LDR in DSA region was compared with experimental values. It was observed that Barlat material model best simulates the deep drawing process in DSA region.
This thesis describes olfactory learning in honeybees (Apis mellifera). The first two chapters de... more This thesis describes olfactory learning in honeybees (Apis mellifera). The first two chapters describe complex forms of learning; Second-order conditioning (SOC) and Context-dependent learning (CDL). The third chapter focuses on sleep behavior. 1) To show SOC we used classical conditioning of the proboscis extension response (PER) in honeybees using odors as conditioning stimulus (CS) and sugar as US. We showed that bees can learn an odor (C) even without an US, but only if C was paired with a previously rewarded odor (A). In other words, bees respond to the new odor C after 5 times A-US pairing followed by 5 times C-A pairing (A-US -> C-A). By changing the sequence of odors (A-US -> A-C) we could not demonstrate an effective SOC. Furthermore not only the sequence of odors, but also the sequence of training is important. Fewer bees show PER to C, after the sequence C-A -> A-US in comparison to the sequence A-US -> C-A These results helped us to understand conditions cri...
Acute Medicine Journal, 2013
We describe a case of infectious mononucleosis (IM) hepatitis occurring in an elderly thespian, w... more We describe a case of infectious mononucleosis (IM) hepatitis occurring in an elderly thespian, who had recently played the role of ‘Father Christmas’. We discuss the importance of differing clinical manifestations in older and younger age groups, the changing epidemiology of Epstein Barr (EB) infection within the United Kingdom and the role of different virology tests in establishing a diagnosis. Raised awareness of this changing pattern of disease could prevent unnecessary investigation and consequent potential iatrogenic complications.
CVR Journal of Science and Technology, 2011
The solution of oscillatory motion of dusty viscoelastic fluid through porous media by finite ele... more The solution of oscillatory motion of dusty viscoelastic fluid through porous media by finite element method is obtained; expressions for the velocity of fluid, dust and skin friction are also obtained. The effects of various parameters on above are shown graphically and discussed.
Journal of Child and Adolescent Behaviour, 2014
The study assessed the impact of Child and Family Teams (CFT) on functional outcomes, for childre... more The study assessed the impact of Child and Family Teams (CFT) on functional outcomes, for children enrolled in Arizona's public behavioral health system. The current study extends the existing evidence on wraparound approach to a public behavioral health setting where randomization may not be feasible and/or ethical. The study was a quasiexperimental non-equivalent post-test only design comprising of 3,950 children with an AXIS V diagnoses of 'severe impairment' in Arizona who were eligible and received Medicaid funded services. Multivariable propensity weights were used to estimate the odds of successful functioning among children who voluntarily participated in a CFT compared to those who did not. Children who participated in CFT had better odds of avoiding delinquency (95% CI, 1.06-1.3, p<0.01) and succeeding in school (95% CI, 1.29-1.55, p<0.01) when compared to the children that did not participate in CFT even after adjusting for other covariates.
IS 737 grade Aluminum alloy is extensively used in industries especially automobile due to its lo... more IS 737 grade Aluminum alloy is extensively used in industries especially automobile due to its low weight. But this material is poorly formable and weldable. That is the reason this material is not used in certain application although it is having superior characteristic of making light weight assemblies. In the present investigation the material is drawn at elevated temperature and its formability was investigated in warm condition and it was found that there was substantial increase in the formability of IS 737 40800 grade material when drawn at 350 0 C. The sensitivity index value is calculated by jump test. These tests were conducted in the plastic region where stress – strain curves are uniform. It is observed that by increasing the temperature of specimen there is an increase in the value of 'm' because of increase in plasticity of material. Thickness strains were also calculated and it was found that by increasing the temperature of the material up to 350 0 C, these s...
Journal of Manufacturing Processes, 2015
ABSTRACT In sheet metal forming, the formability is limited by the onset of localized necking and... more ABSTRACT In sheet metal forming, the formability is limited by the onset of localized necking and it is important to know the limit up to which the material can be formed. Forming limit diagram (FLD) offers a convenient and useful tool to predict the forming behavior of the sheet metals, which can be enhanced by forming at elevated temperatures. This paper is focused on the development of FLD for austenitic stainless steel (ASS) 316 at 300 °C, which has been experimentally determined to be the most suitable temperature for warm forming of ASS 316. Experimental FLD has been constructed by performing hemispherical dome punch tests on different width specimens. Theoretical FLDs have been developed using Marciniak–Kuczynski analysis based on Hill&#39;s and Barlat&#39;s yield criteria and compared with the experimental FLD. Theoretical FLD based on Barlat&#39;s yield criterion is found to be in a close agreement with the experimental FLD. These FLDs can be used for designing various warm forming processes on ASS 316.
PAMM, 2009
This paper presents experimental verification and comparison of damage detection methods based on... more This paper presents experimental verification and comparison of damage detection methods based on changes in mode shapes such as: mode shape curvature (MSC), damage index (DI), strain energy (SE), modified Laplacian operator (MLO), generalized fractal dimension (GFD) and Wavelets Transform (WT). The object of the investigation is to determine benefits and drawbacks of the aforementioned methods and to develop data preprocessing algorithms for increasing damage assessment effectiveness by using signal processing techniques such as interpolation and extrapolation of measured points. Noise reduction algorithms are also tested. The experiments were performed on a steel cantilever beam and on an aluminium plate with riveted stiffeners. Damage was introduced in a form of open crack for beam object and damaged rivets and a saw cut in the angle bar for plate structure. Measurements were made using non-contact Scanning Laser Doppler Vibrometer (SLDV) at 125 points along beam length and 101 points in two rows, distributed on over the plate height and positioned along two reinforcing ribs.
Society of Petroleum Engineers Journal, 1983
Experiments are conducted with actual drilling muds to study the behavior of drilled cuttings in ... more Experiments are conducted with actual drilling muds to study the behavior of drilled cuttings in a vertical annulus. The effect of parameters such as particle size, flow rate, apparent viscosity, and yield point to plastic viscosity ratio on mud-carrying capacity are studied. The applicability of a semiempirical transport model developed by Zeidler also is investigated. It has been shown that in vertical annuluses, the fluid annular velocity has a major effect on the carrying capacity of muds, while the other parameters have an effect only at low to medium fluid annular velocities. We also conclude that Zeidler's semiempirical formulations for the prediction of drilled cuttings behavior are valid with certain limitations.
International Journal of Case Reports and Images, 2012
A 68yearold gentleman presented with a one week history of difficulty clearing food from the left... more A 68yearold gentleman presented with a one week history of difficulty clearing food from the left side of his mouth. He was known to have a three year history of refractory metastatic prostate cancer. Central nervous system examination revealed isolated cranial nerve XII signs including atrophy and fasciculation of the left side of the tongue and deviation of the tongue to the left on protrusion (figure 1). Tongue fasciculation (white circle) and deviation are shown in a short video (url
Resonance, 2014
A short and easy method for the conversion of chair-like transition states into zigzag projection... more A short and easy method for the conversion of chair-like transition states into zigzag projections using planar cyclohexane structures, and also the concepts of change of bond in the plane and group swap by rotation are described. Some common reactions where this method could be used to draw products include: aldol reaction, [3,3] sigmatropic rearrangements, allylation and crotylation of aldehydes, and formation of lithium enolates.
Journal of King Saud University - Engineering Sciences, 2014
Deep drawing is one of the most important sheet metal forming processes in automotive, aerospace ... more Deep drawing is one of the most important sheet metal forming processes in automotive, aerospace and nuclear industries. In this process, the sheet metal blank is formed into a cup shape by an application of punch into the die. The present work is aimed at studying the formability and the nature of fracture for one of the important materials in industrial applications, austenitic stainless steel 316 at different temperatures. Circular blanks were deep drawn at room temperature, 150 and 300°C using a 20 Ton hydraulic press coupled with a furnace and found that formability of the austenitic stainless steel 316 increased as the temperature was increased. This material underwent dynamic strain aging between 350 and 550°C. Fractured surface of the broken tensile test specimen at different regions were studied and analyzed using scanning electron microscope. It was observed that the nature of the fracture was brittle in dynamic strain aging region.
Acta Metallurgica Slovaca, 2014
Dynamic strain aging region for austenitic stainless steel 316 was investigated from room tempera... more Dynamic strain aging region for austenitic stainless steel 316 was investigated from room temperature to 650°C at constant strain rates of 1x10-2, 1x10-3 and 1x10-4 sec-1. Characteristics indicators of serrated plastic flow were observed in the temperature range of 400°C to 600°C at these strain rates. Strain rate sensitivity of the material is found to be negative in this region. Study of fracture surface of tensile test specimen by scanning electron microscope revealed that ductility in this region decreased. The limiting drawing ratio of sheet metal is the indicator of formability in deep drawing. LDR of the sheet metal was estimated by performing the deep drawing of different diameter blanks in finite element simulation software LS-DYNA in DSA temperature region. It was observed that in DSA region, formability of sheet metal decreased. These simulations are validated and compared with experimental results.
Chemical biology & drug design, Jan 11, 2014
A library of structurally distinct enaminones was synthesized using sonication or Ru(II) catalysi... more A library of structurally distinct enaminones was synthesized using sonication or Ru(II) catalysis to couple primary, secondary, and tertiary thioamides with α-halocarbonyls or α-diazocarbonyls. Screening the library for proteasome inhibition using a luciferase-based assay identified seven structurally diverse compounds. Two of these molecules targeted luciferase, while the remaining five exhibited varying potency and specificity for the trypsin-like, chymotrypsin-like, or caspase-like protease activities of the proteasome. Physiological relevance was confirmed by showing these molecules inhibited proteasomal degradation of the full-length protein substrate p21cip1 expressed in tissue culture cells. A cell viability analysis revealed that the proteasome inhibitors differentially affected cell survival. Results indicate a subset of enaminones and precursor molecules identified in this study are good candidates for further development into novel proteasome inhibitors with potential th...
Objectives of this work were to gain a better understanding of the wear of solid ceramic and cera... more Objectives of this work were to gain a better understanding of the wear of solid ceramic and ceramic-coated metallic seal rings in contact with carbon graphite and to determine the solid/solid contact conditions responsible for that wear. Ring-on-ring tests were run under dry conditions (no sealed fluid) with carbon graphite seal rings sliding against two types of hard-seal-face materials, monolithic silicon carbide and metallic materials coated with either tungsten carbide or titanium nitride. The total wear of the hard ring materials were very low in all cases, with reaction-sintered silicon carbide and titanium nitride-coated rings having the lowest total wear. There was less wear of the carbon graphite rings when they were run against coated rings than in contact with SiC. In the analytical phase of this work, the temperature and stress distributions in the sliding contact region were determined using finite element methods. It was shown that frictional heating is the dominant c...
Journal of Neuroscience, 2013
Free-flying honeybees (Apis mellifera carnica) are known to learn the context to solve discrimina... more Free-flying honeybees (Apis mellifera carnica) are known to learn the context to solve discrimination tasks. Here we apply classical conditioning of the proboscis extension response in restrained bees in combination with single-unit extracellular recordings from mushroom body (MB) extrinsic neurons elucidating the neural correlates of context-dependent olfactory discrimination. The contexts were light, colors, and temperatures, either alone or in combination. We found that bees learn context rules quickly and use them for better discrimination. They also solved a transwitching and a cue/context reversal task. Neurons extrinsic to the ␣ lobe of the MB reduced the responses to the rewarded odor, whereas they increased their responses to the context. These results indicate that MB extrinsic neurons encode cues and contexts differently. Data are discussed with reference to MB function.
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Papers by Syed Muhammad Taha Hussaini Hussaini