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Design and Parametric Investigation of Horizontal Axis Wind Turbine

Journal of Shanghai Jiaotong university(Science) 2018年第3期23卷 345-351页

作者： ABBAS Zulkarnain ABBAS Saqlain butt zubair PASHA Riffat Asim School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Mechatronics Engineering University of Engineering and Technology Taxila Chakwal 48800 Pakistan Department of Mechanical Engineering University of Engineering and Technology Taxila Taxila 47080 Pakistan

This research focuses on design and calculations for the horizontal axis wind turbine to fulfill energy demands at small scales in Pakistan. This is the design to produce about 5 kilowatts of electricity to share the load of average home appliances. Area chosen for this research is Pasni, Balochistan in Pakistan to build the wind turbine for electricity. Design values are approximated by appropriate formulas of wind energy design. In current research, turbine blade profile is designed by blade element momentum(BEM) theory. Warlock wind turbine calculator is used to verify the design parameters like wind speed, tip speed ratio(TSR) and efficiency *** of wind speed, wind power, TSR, pitch angle, blade tip angle, number of blades, blade design and tower height on power coefficient are analyzed in this research. Maximum power coefficient is achieved at a designed velocity of 6 m/s. Design analysis is also performed on simulation software ANSYS Fluent. It is observed that designed velocity parameter of this research is very suitable for the turbine blade, so blade designing is perfect according to wind speed range.

关键词： horizontal axis wind turbine Warlock wind turbine calculator planetary gear box

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Numerical Treatment for Stochastic Computer Virus Model

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Computer Modeling in Engineering & Sciences 2019年第8期120卷 445-465页

作者： Ali Raza Muhammad Shoaib Arif Muhammad Rafiq Mairaj Bibi Muhammad Naveed Muhammad Usman Iqbal zubair butt Hafiza Anum Naseem Javeria Nawaz Abbasi Department of Mathematics Stochastic Analysis&Optimization Research GroupAir UniversityPAF Complex E-9IslamabadPakistan Faculty of Engineering University of Central Punjab LahorePakistan Department of Mathematics Comsats UniversityPark Road Chak Shahzad CampusIslamabadPakistan Faculty of Computing National College of Business Administration and Economics LahorePakistan

This writing is an attempt to explain a reliable numerical treatment for stochastic computer virus *** are comparing the solutions of stochastic and deterministic computer virus *** paper reveals that a stochastic computer virus paradigm is pragmatic in contrast to the deterministic computer virus *** of threshold number C^?hold in stochastic computer virus *** C^?1 shows virus persists in the computer ***,stochastic numerical methods fail to cope with large step sizes of *** suggested structure of the stochastic non-standard finite difference scheme(SNSFD)maintains all diverse characteristics such as dynamical consistency,boundedness and positivity as defined by *** numerical treatment for the stochastic computer virus model manifested that increasing the antivirus ability ultimates small virus dominance in a computer community.

关键词： Computer virus,euler maruyama scheme stochastic differential equations stochastic euler scheme stochastic runge-kutta scheme stochastic NSFD scheme stability

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Development and characterization of hot dip aluminide coated stainless steel 316L

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Journal of Central South University 2018年第11期25卷 2578-2588页

作者： Sehrish MUKHTAR Waqas ASGHAR zubair butt Zaheer ABBAS Mudaser ULLAH Rana ATTA-UR-REHMAN College of Engineering and Emerging Technologies University of the PunjabLahorePakistan University of Engineering and Technology Taxila 47050TaxilaPakistan Ningbo Institute of Materials Technology and Engineering(NIMTE) Chinese Academy of Sciences(CAS)Ningbo 315201China Mechatronics Engineering Department University of Engineering and Technology TaxilaChakwal Campus48800ChakwalPakistan MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing Institute of Materials JoiningShandong UniversityJi’nan 250061China Department of Mechanical Engineering CETUniversity of SargodhaPakistan

Stainless steel(SS)grade 316L is used for orthopedic implants due to its biocompatibility;yet the effort should be done to minimize the carcinogenic and inflammatory effects related to SS 316L *** this research,aluminide coating of Al–Si alloy on SS 316L is characterized by using optical microscopy,energy dispersive spectroscopy(EDS),nano-indentation and corrosion testing *** dip aluminizing process is used to coat the SS 316L specimens at 765°C for 2 min immersion *** of the specimens are also diffusion treated in a Muffle furnace at 550°C for 4 h to produce diffused specimens of SS *** examination shows the formation of flat coating/substrate interface due to Si *** analysis confirms the formation of complex intermetallic at the coating/substrate interface which finally results in increasing the hardness and corrosion resistance properties of coating.

关键词： stainless steel aluminide coating microstructure intermetallics nano-indentation corrosion testing

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Retraction note to “Development and characterization of hot dip aluminide coated stainless steel 316L”(J. Cent. South Univ., 10.1007/s11771-018-3937-y)

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Journal of Central South University 2020年第9期27卷 2792-2792页

The Editor-in-Chief has retracted this article [1] because Figures 11 and 12 appear to be identical with Figures 3 and 4respectively from a previously published article [2].Sehrish MUKHTAR,Waqas ASGHAR,zubair butt,Zah... 详细信息

关键词： steel aluminide dip

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Hepatitis C virus genotype 3a infection and hepatocellular carcinoma: Pakistan experience

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World Journal of Gastroenterology 2009年第40期15卷 5080-5085页

作者： Muhammad Idrees Shazia Rafi que Irshad-ur Rehman Haji Akbar Muhammad zubair Yousaf Sadia butt Zunaira Awan Sobia Manzoor Madiha Akram Mahwish Aftab Bushra Khubaib Sheikh Riazuddin Division of Molecular Virology & Molecular Diagnostics National Centre of Excellence in Molecular BiologyUniversity of the Punjab Lahore National Centre of Excellence in Molecular Biology University of the Punjab Lahore

AIM: To assess the association between chronic hepatitis C virus (HCV) infection and hepatocellular carcinoma (HCC) in Pakistan, and the genotype distribution among these HCC ***: One hundred and sixty-one subjects with HCC were included in this study. Liver biopsy was performed on 145 of the patients; sixteen were excluded because they failed to fulfill the inclusion criteria. Qualitative polymerase chain reaction (PCR) was performed for hepatitis B virus and HCV. Samples positive for HCV RNA were genotyped using genotype-specif ic PCR and conf irmed by HCV 5' noncoding region sequencing analysis. RESULTS: Chronic HCV infection was identified a major risk factor (63.44% of tested HCC patients) forthe development of HCC. The time from HCV infection to appearance of cancer was 10-50 years. In the HCC patient population, broader distributions of genotypes were present with genotype 3a as the predominant genotype. Using the type-specific genotyping method, we found HCV genotype 3a in 40.96%, 3b in 15.66%, 1a in 9.63%, and 1b in 2.40% of HCC tissue samples. About 28% of cases were found with mixed genotypes. Two cases were unable to be genotyped because of low viral load. Sixty-six percent of treated patients with cirrhosis had an end of treatment response, but unfortunately they relapsed quickly when the treatment was discontin-ued, and HCC developed during a median 3.8 years. CONCLUSION: There was a strong association between chronic HCV infection and HCC in Pakistan, and between HCV genotype 3a and HCC.

关键词： Hepatocellular carcinoma Hepatitis C Genotyping Etiology Prevalence

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