Wyniki wyszukiwania - BazTech

1

Adsorbent filters for removing polycyclic aromatic hydrocarbons from the atmosphere

Khan Abdul Muqeet, Imran Muhammad, Hashmi Abu Saeed, Shehzad Wasim, Abbas Mateen

Environment Protection Engineering

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2023

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Vol. 49, nr 2

19--27

EN

Indoor activities involving cooking and warming, outdoor sources, smoking, and candle and in-cense burning may introduce a massive portion of polycyclic fragrant hydrocarbons. These are well known for their mutagenicity and carcinogenicity and are omnipresent in urban situations as a result of the combustion of fuel. Due to small particle size, penetration has been suspected to be one major source of indoor polycyclic aromatic hydrocarbons. In the current study, the manufacturing of three types of filters (electrostatic charge-based, pomegranate peel biochar-based, and birds’ feathers-based) was carried out. Their efficiency was tested to remove molecules bounded PAHs and also other geno-toxic compounds associated with these particles. The electrostatic filter was more efficient (27.42%) than pomegranate peel-based and birds’ feathers-based filters (13.86% and 8.32%, respectively). The carcinogenetic effects of PAHs emitted from outdoor and indoor pollutants can be reduced using these kinds of filters.

2

Empirical investigation of public service performance improvement factors

Imran Muhammad, Robina Ramírez Rafael, Awais Hafiz Muhammad

Polish Journal of Management Studies

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2022

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Vol. 26, No. 2

189--208

EN

Public organizations in developing countries are losing public trust due to the weak delivery of community services. The main concern of the countries is to seek ways to meet public expectations regarding the effective and efficient delivery of public department services. The past research revealed the multiple factors that could improve public department service performance. In this regard, the current study will see the contribution of factors, such as organizational culture, organizational structure, digital transformation, and service innovation, in the service performance of public departments of developing countries like Pakistan. The partial least squares structural equation modeling (PLS-SEM) was used to analyze the 382 survey responses data. However, the finding of the study revealed the moderating role of digital transformation and service innovation on the relationship between organizational structure, organizational culture and service performance. Furthermore, the current study found an insignificant relationship between organizational structure and service performance; on the other hand, organisational culture significantly impacts service performance. However, the findings of this study stated that digital transformation strategy, service innovation and organizational culture are important variables for employee service performance in the Motorway Police of Pakistan.

PL

Organizacje publiczne w krajach rozwijających się tracą zaufanie społeczne z powodu słabego świadczenia usług społecznych. Głównym problemem tych krajów jest poszukiwanie sposobów na spełnienie oczekiwań społecznych dotyczących skutecznego i wydajnego świadczenia usług przez urzędy publicznye. Dotychczasowe badania ujawniły wiele czynników, które mogą poprawić wydajność usług publicznych. W związku z tym obecne badanie będzie dotyczyć wpływu czynników, takich jak kultura organizacyjna, struktura organizacyjna, transformacja cyfrowa i innowacje usług, na wydajność usług departamentów publicznych krajów rozwijających się, takich jak Pakistan. Modelowanie równań strukturalnych metodą cząstkowych najmniejszych kwadratów (PLS-SEM) zostały wykorzystane do analizy danych z 382 odpowiedzi na ankiety. Wyniki badania ujawniły jednak moderującą rolę transformacji cyfrowej i innowacji usługowych w relacji między strukturą organizacyjną, kulturą organizacyjną i wydajnością usług. Ponadto w obecnym badaniu wykazało nieistotny związek między strukturą organizacyjną a wydajnością usług; z drugiej strony kultura organizacyjna znacząco wpływa na wydajność usług. Jednak wyniki tego badania wykazały, że strategia transformacji cyfrowej, innowacje w usługach i kultura organizacyjna są ważnymi zmiennymi wpływającymi na wydajność usług pracowników w Policji Autostradowej w Pakistanie.

3

Enzymatic extraction of potato starch: A parametric optimization study using response surface methodology

Hameed Madsar, Ahmad Syed W., Ahmad Sajjad, Qutab Haji G., Dasih Muhammad, Imran Muhammad

Polish Journal of Chemical Technology

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2020

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Vol. 22, nr 3

48--54

EN

Optimized, effective and efficient methodology has been determined in this research work for the recovery of starch from potatoes. Potato starch extraction experimental results have been utilized for the parametric optimization study by using different statistical techniques. In this research work, starch extraction was conducted by employing cellulase enzyme. Response surface methodology (RSM) was put to use to perform statistical analysis to get optimum results. Five-level central composite design (CCD) consisting of three parameters was implemented to investigate the effect of enzyme concentration, contact time and broth dilution. Experiment results revealed that increment in enzyme concentration and contact time enhanced the starch recovery while dilution showed the inverse relation on the recovery of starch. Optimum starch recovery was achieved upto 89% when enzyme concentration (0.5 g/100 g) of potato meal was diluted with 10 mL of water and mixed for 4 h at 45°C.

4

Bismuth and lead based metal organic frameworks: morphological, luminescence and Brunauer-Emmett-Teller (BET) studies

Iram Shamaila, Imran Muhammad, Kanwal Farah, Latif Shoomaila, Iqbal Zafar

Materials Science Poland

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2020

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Vol. 38, No. 1

132--137

EN

Biphenyl-4,4′-dicarboxylic acid (H2BDA) was used as an organic linker to synthesize bismuth and lead based organic frameworks (1 and 2). The structural/morphological studies of these metal organic frameworks (MOFs) were done using UV-Vis, Fourier transform infrared spectroscopy (FT-IR), 1H NMR, energy dispersive spectroscopy (EDXS), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and powder X-ray diffraction method. Surface area as determined by Brunauer-Emmett-Teller (BET) studies revealed better N2 gas adsorption for MOF (1) compared to MOF (2). Both these MOFs exhibited good luminescence activity which was attributed to ligand-to-metal charge transfer transitions (LMCT).

5

Effect of Distilled Water and Kerosene as Dielectrics on Machining Rate and Surface Morphology of Al-6061 During Electricdischarge Machining

Arshad Rubab, Mehmood Shahid, Shah Masood, Imran Muhammad, Qayyum Faisal

Advances in Science and Technology. Research Journal

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2019

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Vol. 13, no 3

162--169

EN

Electric Discharge Machining (EDM) is widely used for manufacturing complex metal parts. The machining parameters like dielectric fluid, electrode material, current, voltage and pulse rate during EDM are controlled to obtain desired Material Removal Rate (MRR) and it also affects the surface morphology of manufactured components. In this research, effect of changing machining parameters, dielectric fluid (distilled water and kerosene) and electrode materials (copper and graphite) on surface morphology of Al 6061 T6 alloy during EDM is investigated. It is observed that the distilled water reacts with the molten aluminum and produces deep pits / voids on the surface due to liberation of hydrogen gas. A micro crack network is seen radiating from the edge of these pits. It is believed that the very high thermal conductivity of distilled water is responsible for the micro crack network and reduced material removal rate when compared with non-reactive kerosene oil.