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- 저자 : ur Rehman, Nadeem (검색결과 343 건)
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Rehman Aziz Ur,Javed Muhammad Tariq,Ahmed Ishtiaq,Saeed Muhammad Adnan,Ehtisham-ul-Haque Syed,Rafique Muhammad Kamran,Sikandar Arbab,Nasir Amar,Ahmad Latif,Kashif Muhammad,Zeeshan Muhammad Abid 아세아·태평양축산학회 2024 Animal Bioscience Vol.37 No.9
Objective: This study aimed to investigate the prevalence of paratuberculosis in cattle and buffaloes at twelve public dairy farms in Punjab, Pakistan.Methods: A total of 2,181 more than two-year-old animals (1,242 cattle and 939 buffaloes) were tested by avian tuberculin, i.e., killed purified protein derivative of <i>Mycobacterium avium</i> paratuberculosis and indirect enzyme linked immunosorbent assay (ELISA). Blood and fecal samples were collected from tuberculin positive animals. These samples were further processed by indirect ELISA. The data were analyzed using frequency analysis and logistic analysis procedures.Results: The prevalence of paratuberculosis at public dairy farms was 3.8%, as determined by tuberculin+ELISA test. It varied from 0.71% to 13.5% with a 100% herd prevalence. Multivariate logistic regression analysis revealed that species, milk production, total animals, total small ruminants, and total buffaloes were significantly associated with the occurrence of paratuberculosis. Odd ratio analysis revealed that with a one-kilogram increase in body weight, there will be a 0.006% increase in disease occurrence. With the increase in one animal in small ruminants and buffaloes, there will be 0.008% and 0.42% greater chances of developing paratuberculosis, respectively. Bivariate logistic regression analysis of cattle and buffaloes revealed that farm number, age, and total number of cattle were significantly associated with the occurrence of paratuberculosis. A one-month increase in lactation length increases the chance of tuberculosis by 0.004%; similarly, a one-liter increase in milk production increases the chance of disease by 10%. With each additional buffalo in the herd, there will be a 0.007% greater chance for the occurrence of paratuberculosis.Conclusion: This study concluded that tuberculin testing can be used in conjunction with ELISA to screen animals for paratuberculosis in countries with scarce resources, such as Pakistan. The efficacy of disease diagnosis can be improved by combining multiple tests. Objective: This study aimed to investigate the prevalence of paratuberculosis in cattle and buffaloes at twelve public dairy farms in Punjab, Pakistan. Methods: A total of 2,181 more than two-year-old animals (1,242 cattle and 939 buffaloes) were tested by avian tuberculin, i.e., killed purified protein derivative of Mycobacterium avium paratuberculosis and indirect enzyme linked immunosorbent assay (ELISA). Blood and fecal samples were collected from tuberculin positive animals. These samples were further processed by indirect ELISA. The data were analyzed using frequency analysis and logistic analysis procedures. Results: The prevalence of paratuberculosis at public dairy farms was 3.8%, as determined by tuberculin+ELISA test. It varied from 0.71% to 13.5% with a 100% herd prevalence. Multivariate logistic regression analysis revealed that species, milk production, total animals, total small ruminants, and total buffaloes were significantly associated with the occurrence of paratuberculosis. Odd ratio analysis revealed that with a one-kilogram increase in body weight, there will be a 0.006% increase in disease occurrence. With the increase in one animal in small ruminants and buffaloes, there will be 0.008% and 0.42% greater chances of developing paratuberculosis, respectively. Bivariate logistic regression analysis of cattle and buffaloes revealed that farm number, age, and total number of cattle were significantly associated with the occurrence of paratuberculosis. A one-month increase in lactation length increases the chance of tuberculosis by 0.004%; similarly, a one-liter increase in milk production increases the chance of disease by 10%. With each additional buffalo in the herd, there will be a 0.007% greater chance for the occurrence of paratuberculosis. Conclusion: This study concluded that tuberculin testing can be used in conjunction with ELISA to screen animals for paratuberculosis in countries with scarce resources, such as Pakistan. The efficacy of disease diagnosis can be improved by combining multiple tests.
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FOURWING SALTBUSH AS A WINTER MAINTENANCE FORAGE FOR SHEEP IN UPLAND BALOCHISTAN
Rehman, Atiq-ur,Rafique, Shahid,Aro, Richard S. Asian Australasian Association of Animal Productio 1990 Animal Bioscience Vol.3 No.2
Sixteen Harnai lambs were used in a completely randomized design to study the nutritive value of fourwing saltbush as a winter maintenance browse in comparison to native range grazing with or without protein and energy supplementation at Tomagh Range Livestock Research Station, in Loralai District, Balochistan. The animals were divided into four groups of four lambs each. These four groups were assigned four treatments at random: fourwing saltbush grazing alone, range grazing plus lucerne hay (100 g/head/day), range grazing plus barley grain (100 g/head/day) and range grazing alone for ten weeks. The results indicate that the two range grazing plus supplementation treatments produced weight gains which were not significantly different from each other (p < 0.05). Both of these treatments yielded significantly higher weight gains (p < 0.05) than did range grazing alone except for the last week of the study. Fourwing saltbush grazing provided cumulative weight gains at 3, 4, 6, 7 and 8 weeks which were not significantly different from the range grazing plus lucerne hay treatment and gained an average of 6 percent in body weight over the 10 week period of study. The carrying capacity for sheep of a mature stand of fourwing saltbush was approximately 20 Sheep-kg-days (SKD) of grazing per cubic meter of foliage. Results of this study suggest that under fourwing saltbush grazing alone, lambs do not only maintain their body weights but can also gain weight in winter.
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Rehman, Saeed Ur,Song, Rak-Hyun,Lim, Tak-Hyoung,Park, Seok-Joo,Hong, Jong-Eun,Lee, Jong-Won,Lee, Seung-Bok Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.16
<P>In this study, a new method is developed for the fabrication of nanofibrous LaCoO3 (LCO) perovskites as cathodes (oxygen electrodes) for solid oxide fuel cells (SOFCs). The proposed method involves chemically assisted electrodeposition (CAED) of mixed metal hydroxide onto a carbon nanotube (CNT) template, followed by a low-temperature heat-treatment process. The CNT template is first fabricated on porous zirconia-based ion-conducting scaffolds (ICS) by catalytic chemical vapor deposition (CCVD) of C2H4. Perovskite-type LCO is then fabricated on the CNT template by CAED process of mixed La-Co hydroxide combined with thermal conversion of hydroxide to perovskite oxide. The method proposed here allows for the fabrication of LCO perovskites with a unique nanofibrous structure at reduced temperatures (∼900 °C), while avoiding the formation of pyrochlore phases (<I>e.g.</I>, La2Zr2O7), which are typically observed during conventional high-temperature sintering processes of LaCoO3 with zirconia-based electrolytes. The new method also provides the precise control needed to achieve desired oxide loadings without the need for repeated deposition-annealing processes. The anode-supported SOFCs with nanofibrous LCO cathodes on zirconia and ceria scaffolds show high and stable electrochemical performance of 0.95 and 1.27 W cm<SUP>−2</SUP>, respectively, at 800 °C. In addition to the absence of insulating pyrochlore phases, the unique nanostructure of the LCO cathode is believed to play a beneficial role in improving the electrochemical properties by providing a large number of active reaction sites and by facilitating mass transport through the porous nanofibrous structure.</P>
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Rehman, Aafaq ur,Baek, Jin Woong,Rene, Eldon R.,Sergienko, Natalia,Behera, Shishir Kumar,Park, Hung-Suck Elsevier 2018 Process safety and environmental protection Vol.118 No.-
<P><B>Abstract</B></P> <P>Climate change issues and acid rain episodes have triggered new research directions and the conceptualization of new preventive approaches to reduce toxic gases from entering the environment. The reduction of carbon dioxide (CO<SUB>2</SUB>) levels in the indoor environment are also one of the challenging human safety issues during emergency incidents and rescues; for instance, a building fire. The use of an activated carbon fiber (ACF) based mask is not only effective to filter CO<SUB>2</SUB> but it is also practically easy to use during such demanding situations. Such modified adsorbents will have high adsorption volume, fast adsorption rates and good thermal, acid and alkaline resistance properties. For the emergency mode considering fires, the major task is atmospheric recovery. Thus, CO<SUB>2</SUB> concentration in the post-fire smoke could be high. The smoke in the room causes suffocations and unconsciousness leading to fatal injuries. In this study, ACF was modified using copper nitrate trihydrate [Cu (NO<SUB>3</SUB>)<SUB>2</SUB> <SUP>.</SUP>3H<SUB>2</SUB>O] by impregnation and carbonization (450°C), followed by its characterization. The modified ACF (Cu-ACF-12) showed large surface area (1147m<SUP>2</SUP> g<SUP>−1</SUP>), high micropore volume (0.45cm<SUP>3</SUP> g<SUP>−1</SUP>) and an average pore size of 1.57nm. CO<SUB>2</SUB> removal tests were carried out in a lab scale fixed bed adsorption column using the modified ACF. The process parameters were optimized based on a Box-Behnken Design (BBD) and tested in the following ranges: gas flow rate – 150–250mlmin<SUP>−1</SUP>, moisture content – 0–40% and modification of the ACF impregnated with copper (Cu) – 4–12wt.%. The experimental results were statistically interpreted to elucidate the main and interaction effects. The modification of ACF showed positive effects on CO<SUB>2</SUB> removal, while gas flow rate and moisture content decreased the CO<SUB>2</SUB> removal. Under the optimal conditions, (gas flow rate – 150mlmin<SUP>−1</SUP>, moisture content – 0% and modification of the ACF – 8%), CO<SUB>2</SUB> removal capacity of 2.31mmol of CO<SUB>2</SUB> g<SUP>−1</SUP> Cu-ACF was obtained.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Modified activated carbon fiber (ACF) for CO<SUB>2</SUB> removal. </LI> <LI> Fixed bed adsorption column using modified ACF for process parameters optimization. </LI> <LI> Optimum CO<SUB>2</SUB> removal capacity of 2.31mmol of CO<SUB>2</SUB> g<SUP>−1</SUP> Cu-ACF at gas flow rate: 150mlmin<SUP>−1</SUP>, moisture content: 0% and modification of the ACF: 8%. </LI> <LI> Close agreement between the predicted and observed CO<SUB>2</SUB> removal capacity. </LI> </UL> </P>
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Rehman, Atteq ur,Khan, Muhammad Farooq,Shehzad, Muhammad Arslan,Hussain, Sajjad,Bhopal, Muhammad Fahad,Lee, Sang Hee,Eom, Jonghwa,Seo, Yongho,Jung, Jongwan,Lee, Soo Hong American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.43
<P>Molybdenum disulfide (MoS2) has recently emerged as a promising candidate for fabricating ultrathin-film photovoltaic devices. These devices exhibit excellent photovoltaic performance, superior flexibility, and low production cost. Layered MoS2 deposited on p-Si establishes a built-in electric field at MoS2/Si interface that helps in photogenerated carrier separation for photovoltaic operation. We propose an Al2O3-based passivation at the MoS2 surface to improve the photovoltaic performance of bulklike MoS2/Si solar cells. Interestingly, it was observed that Al2O3 passivation enhances the built-in field by reduction of interface trap density at surface. Our device exhibits an improved power conversion efficiency (PCE) of 5.6%, which to our knowledge is the highest efficiency among all bulklike MoS2-based photovoltaic cells. The demonstrated results hold the promise for integration of bulklike MoS2 ails with Si-based electronics to develop highly efficient photovoltaic cells.</P>
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Rehman, Muhammad Muqeet,Siddiqui, Ghayas Uddin,ur Rehman, Mohammad Mutee,Kim, Hyun Bum,Doh, Yang Hoi,Choi, Kyung Hyun Elsevier 2018 Materials research bulletin Vol.105 No.-
<P><B>Abstract</B></P> <P>In this study, we have proposed a flexible, rewritable and nonvolatile memory device based on an advanced 2D nanocomposite of hexagonal boron nitride (hBN) flakes and molybdenum disulfide quantum dots (MoS<SUB>2</SUB> QDs). Complete device fabrication was carried out by using extremely simple and highly controllable all printed technology. The electrical characteristics exhibited by the as developed memory devices included the switching ratio, electrical endurance and retention time of ∼10<SUP>3</SUP>, 10<SUP>3</SUP> and 10<SUP>4</SUP> respectively. The device turned ON and OFF at the SET and RESET threshold voltages of +1.4 V and −1 V respectively. The obtained results of electrical and thermal characterizations exhibited that the switching ratio decreases via either increasing temperature (300 K–380 K) or device size (42 μm–100 μm) hence verifying the formation of conductive filament through the functional layer. Moreover, no major degradation in the switching characteristics was observed even after 1500 bending cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We have proposed a flexible, rewritable and NVM device based on an advanced 2D nanocomposite. </LI> <LI> 2D nanocomposite is synthesized by mixing hBN flakes and MoS<SUB>2</SUB> QDs. </LI> <LI> Entire device was fabricated through extremely simple and highly controllable printing technology. </LI> <LI> The RRAM device was tested electrically, mechanically, thermally and chemically. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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