Hammad Hassan - Academia.edu (original) (raw)
Papers by Hammad Hassan
Physica Status Solidi (a), 1971
Journal of Prosthetic Dentistry, 1996
Acta Physica Academiae Scientiarum Hungaricae, 1971
Microbes and Infection, 2002
Parasitic diseases, including human visceral leishmaniasis, are multifactorial. Factors that are ... more Parasitic diseases, including human visceral leishmaniasis, are multifactorial. Factors that are expected to play an important role in the parasite-human interaction are exposure, parasite "virulence" and host resistance factors. In populations exposed to Leishmania donovani most subjects do not allow the parasites to establish themselves or remain asymptomatic. Some individuals, however, fail to control parasite expansion and dissemination and develop a visceral disease. We report here the results of a longitudinal survey whose aims were to identify risk factors underlying visceral leishmaniasis (VL) susceptibility during an outbreak that occurred in a Sudanese village between 1995 and 1999. Most of the 660 subjects (90%) living in the central district were exposed to Leishmania and 20.9% (n = 138), mostly teenagers, developed VL. VL cases increased markedly in adults late in the outbreak, suggesting some changes in adult resistance status or in Leishmania "virulence" during the epidemic. Age and ethnic origin of the patients were the most important critical risk factors to account for the distribution of the VL cases that were recorded during the whole epidemic. This and the high frequency of VL in certain families suggest that host genetic factors played an important role in shaping the outbreak in this village. However, environmental factors (the presence of cows and neems in the households) that increase/decrease exposure to the parasite had significant effects on the distribution of VL cases in the village in the first phase of the outbreak.
Physical Review C, 1997
In the present work the equation of state (EOS) is derived using three types of potentials for po... more In the present work the equation of state (EOS) is derived using three types of potentials for polarized nuclear matter. The potentials used are the extended Seyler-Blanchard (SB), modified Seyler-Blanchard (MSB) and the generalized Seyler-Blanchard (GSB) potentials. It is found that the equation of state derived using SB potential is a stiff EOS whereas the equations of state derived using
American Industrial Hygiene Association Journal, 1984
The isomeric composition of airborne toluene diisocyanate has been determined in two plants produ... more The isomeric composition of airborne toluene diisocyanate has been determined in two plants producing slab stock flexible polyurethane foam. The high performance liquid chromatographic technique used for analysis of the collected samples was optimized for the quantitative and qualitative determination of 2,4 and 2,6-TDI. The data indicates that there is a very large increase in the amount of airborne 2,6-TDI relative to the 2,4 isomer, as compared to the starting material used in the process. The magnitude of the increase was dependent on the stage of production. These results are consistent with the hypothesis of increased offgassing of 2,6-TDI, due to its lower reactivity.
Medical Information Bus (MIB) is a standard designed to allow different medical instrument manufa... more Medical Information Bus (MIB) is a standard designed to allow different medical instrument manufacturers to transmit data from their instruments to a host computer. The authors felt that such a system, if developed without any field experience and feedback from end users, might be impractical. Therefore, they developed and implemented an MIB system using IV pumps. The MIB standard at that time was used for the system development. After a few trials and design modifications based on the user feedback, a system was designed to collect data from IV pumps. The system includes device communication controllers as the pump-MIB interface and a master communication controller capable of communicating with up to 254 devices in one unit as the host interface. The MIB host system software on a Charles River Data Systems micromini and host system was modified to acquire data for HELP, the hospital information system.>
Journal of Oral Rehabilitation, 1998
SUMMARY Disc-shaped specimens are frequently tested in order to establish an understanding of the... more SUMMARY Disc-shaped specimens are frequently tested in order to establish an understanding of the properties of ceramic material. In this study three-dimensional finite element stress analysis has been used to investigate the loading characteristics of this shape of specimen and the effect of incorporating scratches and voids into its structure. The results indicated that stress increased as loading was carried out nearer to the centre of the specimen. The presence of cracks did not affect these stresses whereas the presence of a void resulted in a very high stress concentration.
Journal of Clinical Investigation, 2009
Physica Status Solidi (a), 1971
Journal of Prosthetic Dentistry, 1996
Acta Physica Academiae Scientiarum Hungaricae, 1971
Microbes and Infection, 2002
Parasitic diseases, including human visceral leishmaniasis, are multifactorial. Factors that are ... more Parasitic diseases, including human visceral leishmaniasis, are multifactorial. Factors that are expected to play an important role in the parasite-human interaction are exposure, parasite "virulence" and host resistance factors. In populations exposed to Leishmania donovani most subjects do not allow the parasites to establish themselves or remain asymptomatic. Some individuals, however, fail to control parasite expansion and dissemination and develop a visceral disease. We report here the results of a longitudinal survey whose aims were to identify risk factors underlying visceral leishmaniasis (VL) susceptibility during an outbreak that occurred in a Sudanese village between 1995 and 1999. Most of the 660 subjects (90%) living in the central district were exposed to Leishmania and 20.9% (n = 138), mostly teenagers, developed VL. VL cases increased markedly in adults late in the outbreak, suggesting some changes in adult resistance status or in Leishmania "virulence" during the epidemic. Age and ethnic origin of the patients were the most important critical risk factors to account for the distribution of the VL cases that were recorded during the whole epidemic. This and the high frequency of VL in certain families suggest that host genetic factors played an important role in shaping the outbreak in this village. However, environmental factors (the presence of cows and neems in the households) that increase/decrease exposure to the parasite had significant effects on the distribution of VL cases in the village in the first phase of the outbreak.
Physical Review C, 1997
In the present work the equation of state (EOS) is derived using three types of potentials for po... more In the present work the equation of state (EOS) is derived using three types of potentials for polarized nuclear matter. The potentials used are the extended Seyler-Blanchard (SB), modified Seyler-Blanchard (MSB) and the generalized Seyler-Blanchard (GSB) potentials. It is found that the equation of state derived using SB potential is a stiff EOS whereas the equations of state derived using
American Industrial Hygiene Association Journal, 1984
The isomeric composition of airborne toluene diisocyanate has been determined in two plants produ... more The isomeric composition of airborne toluene diisocyanate has been determined in two plants producing slab stock flexible polyurethane foam. The high performance liquid chromatographic technique used for analysis of the collected samples was optimized for the quantitative and qualitative determination of 2,4 and 2,6-TDI. The data indicates that there is a very large increase in the amount of airborne 2,6-TDI relative to the 2,4 isomer, as compared to the starting material used in the process. The magnitude of the increase was dependent on the stage of production. These results are consistent with the hypothesis of increased offgassing of 2,6-TDI, due to its lower reactivity.
Medical Information Bus (MIB) is a standard designed to allow different medical instrument manufa... more Medical Information Bus (MIB) is a standard designed to allow different medical instrument manufacturers to transmit data from their instruments to a host computer. The authors felt that such a system, if developed without any field experience and feedback from end users, might be impractical. Therefore, they developed and implemented an MIB system using IV pumps. The MIB standard at that time was used for the system development. After a few trials and design modifications based on the user feedback, a system was designed to collect data from IV pumps. The system includes device communication controllers as the pump-MIB interface and a master communication controller capable of communicating with up to 254 devices in one unit as the host interface. The MIB host system software on a Charles River Data Systems micromini and host system was modified to acquire data for HELP, the hospital information system.>
Journal of Oral Rehabilitation, 1998
SUMMARY Disc-shaped specimens are frequently tested in order to establish an understanding of the... more SUMMARY Disc-shaped specimens are frequently tested in order to establish an understanding of the properties of ceramic material. In this study three-dimensional finite element stress analysis has been used to investigate the loading characteristics of this shape of specimen and the effect of incorporating scratches and voids into its structure. The results indicated that stress increased as loading was carried out nearer to the centre of the specimen. The presence of cracks did not affect these stresses whereas the presence of a void resulted in a very high stress concentration.
Journal of Clinical Investigation, 2009