Papers by md ibrahim khan
African Journal of Biotechnology, 2009
The in vitro antimicrobial activity of Justicia adhatoda, Glycyrrhiza glabra and Hyssopus officin... more The in vitro antimicrobial activity of Justicia adhatoda, Glycyrrhiza glabra and Hyssopus officinalis extracts were studied against selected bacteria by using agar well diffusion assay. Methanol, ethanol, chloroform, diethyl-ether and aqueous extracts were tested in crude form for antibacterial activity against Bacillus subtillus, Escherichia coli, Pseudomonas aeruginosa, Salmonella typhimurium and Staphylococcus aureus. Maximum antibacterial activity was exhibited by all the three plant extracts. The results obtained with P. aeruginosa were particularly interesting since it was not inhibited by the antibiotic used but the tested plant extracts effectively inhibited the growth of P. aeruginosa. The methanolic extract of J. adhatoda was effective against S. typhimurium. All the plants extract in water were effective against spore forming of B. subtillus while S. aureus and E. coli were not effectively inhibited by extracts of tested plants. The results of analysis of variance have sh...
Nanoscale, 2016
We demonstrated a highly-sensitive, wafer-scale, high-uniform plasmonic nano-mushroom substrate b... more We demonstrated a highly-sensitive, wafer-scale, high-uniform plasmonic nano-mushroom substrate based on plastic for naked-eye plasmonic colorimetry and surface-enhanced Raman spectroscopy (SERS). We gave it the name FlexBrite. The dual-mode functionality of FlexBrite allows for label-free qualitative analysis by SERS with the enhancement factor (EF) of 10 8 and label-free quantitative analysis by naked-eye colorimetry with the sensitivity of 611 nm/RIU. The SERS EF of FlexBrite in wet state was found to be 4.81×10 8 , 7 times stronger than dry state, making FlexBrite suitable for aqueous environments such as microfluid system. The label-free detection of biotin-streptavidin interaction by both SERS and colorimetry was demonstrated with FlexBrite. Detection of trace amount of the narcotic drug methamphetamine in drinking water by SERS was implemented with a handheld Raman spectrometer and FlexBrite. This plastic-based dual-mode nano-mushroom substrate FlexBrite has the potential to be used as a sensing platform for easy and fast analysis of chemical and biological assay.
The burden of infections and child health in Iraq
Saudi Medical Journal, 2003
Figure 1 - The rate progress in under 5 years mortality rate in Iraq (United Nations Internationa... more Figure 1 - The rate progress in under 5 years mortality rate in Iraq (United Nations International Childrens Fund, 2003). ... 1406 Saudi Med J 2003; Vol. 24 (12) www.smj.org.sa ... The burden of infections and child health in Iraq ... Table 1 - Nutritional profile of Iraqi children (United ...
Development of Instrumentation for Test and Evaluation of a Signal Processing System
Journal of the American Musical Instrument Society
Embedded systems interaction with environment inherently complicates understanding of requirement... more Embedded systems interaction with environment inherently complicates understanding of requirements and product uncertainty is highest during early stages of development. Design verification is an essential step and this process involves detailed observations of runtime execution behaviour against properties that specify intended system behaviour. This work aims at the development of a novel dedicated real time Verification Instrumentation for Test and Evaluation that allows early introduction of integration steps, and thereby reducing the development costs. To perform dynamic evaluation, basic components required in-addition to target system is: (i) input test-sequences (ii) run-time monitoring and (iii) verification mechanisms. The proposed Evaluation architecture is based on hybrid monitoring architecture distributed between the embedded systems product under development and Verification Instrumentation for Test and Evaluation. Prototype PC based Verification Instrument is develop...
Alternative Management and Mitigation for Potential Impacts of Oil and Gas Operations in the World's Largest and Most Productive Ecologically Sensitive Site
SPE Annual Technical Conference and Exhibition, 2006
Sundarbans mangrove ecosystem, the world largest mangrove forest in Bangladesh, is one of the mos... more Sundarbans mangrove ecosystem, the world largest mangrove forest in Bangladesh, is one of the most productive and biologically diverse wetlands in the world. This unique coastal tropical forest is among the most threatened habitats on earth. Its importance lies in its floristic composition, resource and economic value and precious wildlife reserve. It is a habitat of some 40,000 wildlife species including endangered royal Bengal tigers, rare freshwater dolphins, and crocodiles. It is a nursing and breeding ground of over 340 fish species and 250 bird species and many others. This paper critically examines the present status of the Sundarbans and assesses the potential threat of oil and gas exploration. Every aspect of the exploration and development of oil and gas is analyzed and the magnitude of the impact quantified. In addition detailed guidelines and mitigation plans that will minimize potential impacts are addressed. A case study is done in the Sundarbans mangrove and it shows ...
Croatian medical journal, 2002
To assess the significance of health system research in reducing the burden of tuberculosis and i... more To assess the significance of health system research in reducing the burden of tuberculosis and improving the performance of National Tuberculosis Control Program in Pakistan. Qualitative and quantitative content analysis of research papers on tuberculosis and influence of the research knowledge on the efficiency of the National Tuberculosis Control Program. We analyzed 268 research papers on tuberculosis in Pakistan published in the 1960-2002 period, from both national and international perspectives. The majority of the studies covered epidemiology of tuberculosis (n=76) in Pakistan, whereas the rest of the papers addressed issues like pediatric tuberculosis (n=53), tuberculosis among Pakistani immigrants (n=35), tuberculosis-HIV synergism (n=24), care seeking (n=19), adherence with tuberculosis treatment (n=14), tuberculosis among women (n=12), tuberculosis prevention (n=12), directly observed treatment short-course (DOTS) strategy modification (n=5), tuberculosis drug resistance ...
Tuberculous meningitis: a disease of fatal outcome in children
European journal of pediatrics, 2003
... IM Khan (&) Æ S. Khan Æ U. Laaser Section of International Public Health, School ... more ... IM Khan (&) Æ S. Khan Æ U. Laaser Section of International Public Health, School of Public Health, University of Bielefeld, PO Box 100131, 33501, Bielefeld, Germany E-mail: ibrahim.khan@uni-bielefeld.de Tel.: +49-521-1065166 Fax: +49-521-1066009 Page 2. Glossary ...
Dynamic Scenarios in Embedded System Verification
Advances in Intelligent Systems and Computing, 2015
Scenario-based approaches have become attractive for designs through testing of embedded systems ... more Scenario-based approaches have become attractive for designs through testing of embedded systems (ES). For verification, the system under development should be analyzed during its operation. Modeling of dynamic scenarios provides advantages of combining runtime verification with test generation and supports dynamic analysis of systems. This paper presents application of dynamic scenarios for test generation of a practical embedded signal processing system as case study.
Integration Testing of Multiple Embedded Processing Components
Communications in Computer and Information Science, 2011
Abstract. Integration testing of Complex Embedded systems (CES) and associated interconnection ne... more Abstract. Integration testing of Complex Embedded systems (CES) and associated interconnection network has not been discussed much in the literature. This paper focuses on integration testing among Embedded Processing Components (EPCs) that are (loosely coupled) ...
International Journal of Ad hoc, Sensor & Ubiquitous Computing, 2011
Embedded systems interaction with environment inherently complicates understanding of requirement... more Embedded systems interaction with environment inherently complicates understanding of requirements and their correct implementation. However, product uncertainty is highest during early stages of development. Design verification is an essential step in the development of any system, especially for Embedded System. This paper introduces a novel adaptive design methodology, which incorporates step-wise prototyping and verification. With each adaptive step product-realization level is enhanced while decreasing the level of product uncertainty, thereby reducing the overall costs. The backbone of this framework is the development of Domain Specific Operational (DOP) Model and the associated Verification Instrumentation for Test and Evaluation, developed based on the DOP model. Together they generate functionally valid test-sequence for carrying out prototype evaluation. With the help of a case study 'Multimode Detection Subsystem' the application of this method is sketched. The design methodologies can be compared by defining and computing a generic performance criterion like Average design-cycle Risk. For the case study, by computing Average design-cycle Risk, it is shown that the adaptive method reduces the product development risk for a small increase in the total design cycle time.
This paper presents a continuous maximum power point tracking algorithm to get better the effecti... more This paper presents a continuous maximum power point tracking algorithm to get better the effectiveness of the photovoltaic panel by capturing the maximum output power from it and ensure optimum power availability to the load. As the incident solar radiation and the temperature of the panel changes continuously, in such an unpredictable parameters changing situation, the decision of locating the maximum power point is not always tedious but also a wearisome job. Up till now several MPPT techniques have been developed in different ways to resolve the problem. In these the most commonly used techniques are Perturb & Observe method, Variable Inductor method, Incremental Conductance method, and Parasitic Capacitance method for a large Photovoltaic array. In Perturb and observe method, we can improve the efficiency of PV panel through variation in duty cycle using a special control mechanism. Also we present some simulation results of PV panel for a specific location with all parameters known. Finally we will show that the efficiency of Perturb and Observe method can be increased significantly using our proposed technique.
Journal of Nanomaterials, 2008
Among various ways to produce nanowires, anodic alumina membrane- (AAM-) based synthesis has cons... more Among various ways to produce nanowires, anodic alumina membrane- (AAM-) based synthesis has constantly received much attention, because AAM has a uniform and parallel porous nanostructure which makes it an ideal template material for fabricating highly ordered nanostructures. In this paper, we report fabrication of InSb nanowire arrays with diameter of 200 nm and 30 nm by direct current electrodeposition inside the nanochannels of anodic alumina membranes without subsequent annealing. The nanowires have four major growth directions, (220) being the most dominant with structure defects such as twins. The transmission electron microscopy (TEM) and scanning electron microscopy (SEM) results demonstrate that these InSb nanowires are uniform with diameters about 200 nm and 30 nm, corresponding to the pore diameter of the AAMs. The I-V measurement of a single nanowire is also reported with encouraging preliminary results.
Large-area bi-functional nano-mushroom plasmonic sensor for colorimetry and surface-enhanced Raman spectroscopy
CLEO: 2014, 2014
ABSTRACT Wafer-scale nano-mushroom sensor was demonstrated with the refractive index sensitivity ... more ABSTRACT Wafer-scale nano-mushroom sensor was demonstrated with the refractive index sensitivity of 373 nm/RIU, resulting in significant color shift detectable by eye. It also works for surface-enhanced Raman spectroscopy with the enhancement factor of 10^7.
Template directed fabrication and characterization of one-dimensional nanostructures for nanoelectronics
Limitation of near future scaling down of conventional silicon technology stimulated the quest fo... more Limitation of near future scaling down of conventional silicon technology stimulated the quest for alternative technologies in nanometer-scale materials and devices in recent years. Since the discovery of carbon nanotubes, there has been great interest in the synthesis and characterization of other one-dimensional materials. Nanorods, wires, belts, and tubes make up one particular class of anisotropic nanomaterials, which are considered
Optics letters, Jan 15, 2014
We have implemented a multifunctional optofluidic sensor that can monitor changes in the refracti... more We have implemented a multifunctional optofluidic sensor that can monitor changes in the refractive index and pressure of biofluid simultaneously and can detect free-solution molecular interaction in situ. In this Letter, we demonstrate two major improvements of this sensor proven by both simulation and experiments. One improvement is the broader measurement range of refractive index by making the diffraction grating with high-index polymer. The other improvement is the separation of refractive index sensing from opacity sensing by using the relative power ratio of diffraction orders. This simple, compact and low-cost multifunctional optofluidic sensor has the potential to be used for in situ biofluid monitoring.
Sensors integration in embedded systems
2010 International Conference on Power, Control and Embedded Systems, 2010
Abstract Sensors/actuators are critical components of several Complex Embedded Systems (CES). In ... more Abstract Sensors/actuators are critical components of several Complex Embedded Systems (CES). In these CES a fault in the sensors or actuators can trigger the incidence of catastrophic events. Sensor/actuator faults detection is difficult and impacts critically the ...
Ecosystem-Based Approaches to Offshore Oil and Gas Operation: An Alternative Environmental Management Technique
All Days, 2003
The oil and gas sector is one of the most lucrative sectors in business but reducing its environm... more The oil and gas sector is one of the most lucrative sectors in business but reducing its environmental impact is one of the most pressing issues today. Practically all activities of hydrocarbons operations are accompanied by undesirable discharges of liquid, solid, and gaseous wastes, which have enormous impacts, especially in the marine environment. There is clearly a need to develop a management approach in oil and gas operations, which ensures minimization of adverse environmental impacts. Unfortunately, in trying to achieve this goal, the oil and gas industry has adopted some major misconceptions in it "environmentally correct" approaches, which are causing further damage to environment. This presentation will address the present environmental misconceptions common in oil and gas development. Some innovative solutions are proposed to solve the problems caused by oil and gas development activities in the marine environment. These solutions are based on the holistic envi...
Journal of Nanoscience and Nanotechnology, 2009
InSb nanowire arrays have been fabricated by direct current electrodeposition inside the nanochan... more InSb nanowire arrays have been fabricated by direct current electrodeposition inside the nanochannels of anodic alumina membranes without subsequent annealing. After Au contacts were patterned to the nanowires using electron beam lithography, photoresponse studies were conducted. Absorbance peaks were also recorded from free suspending nanowires. A significant response was observed when the wires were exposed to visible light and infrared absorption peaks were observed during absorption experiment. Comparisons were also made between single and multiple nanowires' responses. The nanowires also conduct almost no current in the dark, but when hit with light, they conduct 10,000 times more current. This photoconducting property could lead to a variety of tiny optoelectronic devices potentially useful in future generations of nanoelectronics and chemical sensors.
Journal of Nanoelectronics and Optoelectronics, 2008
InSb nanowires with high crystalline properties are synthesized with a diameter of 200 nm via dir... more InSb nanowires with high crystalline properties are synthesized with a diameter of 200 nm via direct current electrodeposition method inside the nanochannels of anodic alumina membranes. For the first time, the characteristics of field effect transistors based on InSb nanowires synthesized via electrochemistry is presented. A single InSb nanowire is used as a channel with gold source and drain contacts. A p ++ silicon substrate is used as the back-gate contact. Both nanowire synthesis and device fabrication are performed at room temperature and nanowire hole mobility is measured to be 57 cm 2 V −1 s −1 suggesting high structural quality of the as-grown InSb nanowires.
Comparative strengths of internal fixation techniques
The Journal of Hand Surgery, 1985
The strengths of internal fixation techniques have been compared by transecting human cadaver met... more The strengths of internal fixation techniques have been compared by transecting human cadaver metacarpals, reducing and fixing the fractures, and then applying forces to mechanically bend the bone during simulated flexion. Kirschner wires alone, intraosseous wire loops with and without Kirschner wires, and bone plates were tested. Intraosseous loops were tested in three configurations, each with four different wire gauges. Intraosseous loops were stronger than Kirschner wires. Right-angle loops were the best of the intraosseous configurations. The addition of a Kirschner wire strengthened the best dorsopalmar intraosseous loops but not the best right-angle loops. Dorsal bone plates were comparable with the best intraosseous loop configurations of 26-gauge wire.
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Papers by md ibrahim khan