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Negative effect of Ni on PtHY in n-pentane isomerization evidenced by IR and ESR studies

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Journal of Natural Gas Chemistry 2012年第1期21卷 29-36页

作者： muhammad arif ab aziz Nur Hidayatul Nazirah Kamarudin Herma Dina Setiabudi Halimaton Hamdan Aishah abdul Jalil Sugeng Triwahyono Department of Chemical Engineering Faculty of Chemical Engineering Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia Department of Chemistry Faculty of Science Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia Ibnu Sina Institute for Fundamental Science Studies Faculty of Science Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia

Ni/PtHY with different Ni loadings was prepared by impregnating HY with hexachloroplatinic acid solution and Ni2＋/N,N-dimethylformamide solution. An increase in the Ni loading decreased the crystallinity, specific surface area and meso-micropores of the catalysts. Ni interacted with hydroxyl groups to produce IR absorption bands at 3740-3500 cm-1, Increasing Ni loadings resulted in a decrease in the intensities of the broad bands at 3730-3500 cm-1 and the sharp band at 3740 cm-1 with simultaneous development of new absorbance band at 3700 cm-1 that was attributed to （-OH）Ni. The acidity of the samples did not significantly change with Ni loadings up to 1.0 wt%, which indicated that Ni mostly interacts with non-acidic silanol groups （terminal- and structural-defect OH groups）. The presence of Ni decreased the activity of PtHY toward the isomerization of n-pentane because of a decrease in the number of active protonic-acid sites that formed from molecular hydrogen. IR and ESR studies confirmed that Pt facilitated the formation of protonic-acid sites from molecular hydrogen, whereas Ni, even when combined with Pt, didn＇t exhibit such ability. The absence of protonic-acid sites from molecular hydrogen significantly decreased the yield of iso-pentane and markedly increased the cracking products.

关键词： Ni.Ni/PtHY n-pentane isomerization hydrogen protonic acid sites

A Flexible Architecture for Cryptographic Applications: ECC and PRESENT

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Computers, Materials & Continua 2023年第7期76卷 1009-1025页

作者： muhammad Rashid Omar S.Sonbul muhammad arif Furqan aziz Qureshi Saud.S.Alotaibi Mohammad H.Sinky Department of Computer Engineering Umm Al-Qura UniversityMakkah21955Saudi Arabia Computer Science Department Umm Al-Qura UniversityMakkah21955Saudi Arabia Cyber R&D Specialist NASTPRawalpindi46000Pakistan Department of Information Systems Umm Al-Qura UniversityMakkah21955Saudi Arabia

This work presents a flexible/unified hardware architecture of Elliptic-curve Cryptography(ECC)and PRESENT for cryptographic *** features of the proposed work are(i)computation of only the point multiplication operation of ECC over GF(2163)for a 163-bit key generation,(ii)execution of only the variant of an 80-bit PRESENT block cipher for data encryption&decryption and(iii)execution of point multiplication operation(ECC algorithm)along with the data encryption and decryption(PRESENT algorithm).To establish an area overhead for the flexible design,dedicated hardware architectures of ECC and PRESENT are implemented in the first step,and a sum of their hardware area is ***,the implementation of the proposed flexible architecture for ECC and PRESENT algorithms is *** results regarding the area,clock cycles,latency,clock frequency,and power after the place-and-route level on Xilinx Virtex-5,Virtex-6,and Virtex-7 FPGA devices are ***,the implementation results and comparisons show that the proposed architecture suits applications demanding flexible implementation of cryptographic applications.

关键词： Flexible unified design ECC PRESENT FPGA

Rabi oscillation generation in the microring resonator system with double-series ring resonators

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Optoelectronics Letters 2015年第5期11卷 342-347页

作者： Ahmad Fakhrurrazi Ahmad Noorden Kashif Chaudhary Mahdi Bahadoran muhammad Safwan aziz muhammad arif Jalil Ong Chee Tiong Jalil Ali Preecha Yupapin Institute of Advance Photonics Science Nanotechnology Research AllianceUniversiti Teknologi Malaysia Department of Mathematics Universiti Teknologi Malaysia Advanced Studies Center Faculty of ScienceKing Mongkut's Institute of Technology Ladkrabang

In this paper, a microring resonator(MRR) system using double-series ring resonators is proposed to generate and investigate the Rabi oscillations. The system is made up of silicon-on-insulator and attached to bus waveguide which is used as propagation and oscillation medium. The scattering matrix method is employed to determine the output signal intensity which acts as the input source between two-level Rabi oscillation states, where the increase of Rabi oscillation frequency with time is obtained at the resonant state. The population probability of the excited state is higher and unstable at the optical resonant state due to the nonlinear spontaneous emission process. The enhanced spontaneous emission can be managed by the atom(photon) excitation, which can be useful for atomic related sensors and single-photon source applications.

关键词： resonator oscillation resonant waveguide unstable excited spontaneous insulator attached Hamiltonian

Improving Quantitative and Qualitative Characteristics of Wheat (Triticum aestivum L.) through Nitrogen Application under Semiarid Conditions

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Phyton-International Journal of Experimental Botany 2023年第4期92卷 1001-1017页

作者： muhammad Rafiq muhammad Saqib Husnain Jawad Talha Javed Sadam Hussain muhammad arif Baber Ali muhammad Sultan Ali Bazmi Ghulam abbas Marjan aziz Mohammad Khalid Al-Sadoon Aneela Gulnaz Sobhi F.Lamlom muhammad Azeem Sabir Jameel Akhtar Agronomic Research Institute Ayub Agricultural Research InstituteFaisalabad38850Pakistan Depertment of Agronomy University of AgricultureFaisalabad38040Pakistan Department of Agronomy Northwest A&F UniversityYangling712100China Department of Plant Sciences Quaid-i-Azam UniversityIslamabad45320Pakistan Fodder Research Institute Sargodha Sargodha40100Pakistan Department of Agricultural Engineering Barani Agricultural Research InstituteChakwal48800Pakistan Department of Zoology College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia Department of Biotechnology Yeungnam UniversityGyeongbuk38641Korea Plant Production Department Faculty of Agriculture Saba BashaAlexandria UniversityAlexandria21531Egypt Department of Forestry Range and Wildlife ManagementThe Islamia University of BahawalpurBahawalpur63100Pakistan

Nitrogen(N),the building block of plant proteins and enzymes,is an essential macronutrient for plant functions.A field experiment was conducted to investigate the impact of different N application rates(28,57,85,114,142,171,and 200 kg ha^(−1))on the performance of spring wheat(***-2016)during the 2017–2018 and 2018–2019 growing seasons.A control without N application was kept for *** years mean data showed optimum seed yield(5,461.3 kg ha^(−1))for N-application at 142 kg ha^(−1) whereas application of lower and higher rates of N did not result in significant and economically higher seed yield.A higher seed yield was obtained in the 2017–2018(5,595 kg ha^(−1))than in the 2018–2019(5,328 kg ha^(−1))growing seasons under an N application of 142 kg ha^(−1).It was attributed to the greater number of growing degree days in the first(1,942.35°C days)than in the second year(1,813.75°C).Higher rates of N(171 and 200 kg ha^(−1))than 142 kg ha^(−1) produced more number of tillers(i.e.,948,300 and 666,650 ha^(−1),respectively).However,this increase did not contribute in achieving higher *** of 142,171,and 200 kg ha^(−1) resulted in 14.15%,15.0%and 15.35%grain protein concentrations in comparison to 13.15%with the application of 114 kg ha^(−1).It is concluded that the application of N at 142 kg ha^(−1) could be beneficial for attaining higher grain yields and protein concentrations of wheat cultivar Ujala-2016.

关键词： Economical yield growing degree days nitrogen Ujala-2016 wheat

High Frequency Plant Regeneration from Leaf Derived Callus of <i>Dianthus caryophyllus</i>L.

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American Journal of Plant Sciences 2014年第15期5卷 2454-2463页

作者： muhammad arif Saima Rauf aziz Ud Din Mamoona Rauf Humera Afrasiab Department of Botany University of the Punjab Quaid-e-Azam Campus Lahore Pakistan Department of Genetics Hazara University Garden Campus Mansehra Pakistan Institute of Agricultural Sciences University of the Punjab Lahore Pakistan National Institute for Biotechnology and Genetic Engineering Faisalabad Pakistan

An efficient procedure was developed for in vitro callus induction, proliferation and regeneration of carnation cultivar (Dianthus caryophyllus L.) using leaf, nodal and inter-nodal explants on Murashige and Skoog’s medium (MS) supplemented with exogenous plant growth regulators. For morphogenic callus induction and proliferation from various explants, MS medium supplemented with 3.0 mg/l 2,4-D was highly efficient with 100% callus induction frequency from inter-nodal explants. Leaf explants showed quicker response than nodal and inter-modal explants, for callus initiation within 6 days of inoculation. Best grown callus was obtained from leaf explant. The leaf-derived callus was maintained up to several weeks, which indicated that 8-week incubation period was the most suitable for obtaining well proliferated, morphogenic callus. Temperature variation also affected the growth of in vitro induced morphogenic callus from various explants. Results have shown that 27°C proved to be the best temperature for morphogenic callus induction and proliferation from leaf and inter-nodal explants. Among the auxin-cytokinin combination, MS medium containing 1.0 mg/l N(6)-benzylaminopurin (BAP) and 2.0 mg/l NAA showed the highest efficiency of callus initiation and proliferation from leaf, nodal and inter-nodal explants. Light conditions proved better for callogenesis and proliferation from leaf, nodal and inter-nodal explants. Regeneration response from well grown morphogenic callus was prominent on MS medium supplemented with 3.0 mg/l BAP alone and 1.0 mg/l NAA with 3.0 mg/l BAP.

关键词： Dianthus caryophyllus L. Regeneration Potential Plant Growth Regulators Morphogenic Callus Induction

A Potential Approach to Enhance the Seebeck Coefficient of UHMWPE by Using the Graphene Oxide

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Non-Metallic Material Science 2020年第2期2卷 21-27页

作者： Aqsa Irfan Malik Naqash Mehmood Malik Sajjad Mehmood arif aziz Mansoor Ahmad Baluch muhammad Rizwan Tariq Yasin Department of Basic Science University of Engineering and TechnologyTaxila47050Pakistan Department of Physics Air University444000IslamabadPakistan Harbin Engineering University HarbinHeilingjiang150001China Department of Chemistry Pakistan Institute of Engineering and Applied Sciences45650IslamabadPakistan

Thermoelectric materials have been a competent source for the production of energy in the present *** most important and potential parameter required for the material to have better thermoelectric characteristics is the Seebeck *** this work,ultra high molecular weight polyethylene(UHMWPE)and graphene oxide(GO)nanocomposites were prepared by mechanical mixing by containing 10000ppm,50000ppm,70000ppm,100000ppm,150000ppm,and 200000ppm loadings of graphene *** to the intrinsic insulating nature of UHMWPE,the value of Seebeck for pristine UHMWPE and its nanocomposites with 10000ppm&50000ppm of GO concentration was too low to be ***,the Seebeck coefficient for composites with 70000ppm,100000ppm,150000ppm,and 200000ppm loadings of GO was found to be 180,206,230,and 235μV/K,*** higher values of Seebeck coefficients were attributed to the superior thermal insulating nature of UHMWPE and the conductive network induced by the GO within the UHMWPE insulating ***,the values of the figure of merit and power factor were negligibly small due to the lower concentration of charge carriers in UHMWPE/GO nanocomposites but still reported,results are extremely hopeful for considering the composite as the potential candidate for thermoelectric applications.

关键词： UHMWPE Graphene oxide Electrical conductivity Thermal conductivity Seebeck coefficient Figure of merit

Assessment of Biochemical and Antioxidative Status in Patients Suffering from Dengue Fever

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Journal of Huazhong University of Science and Technology(Medical Sciences) 2015年第3期35卷 411-418页

作者： Mahmood Rasool arif Malik Khalid Mahmud Khan muhammad Saeed Qureshi Beenish Shabbir Sara Zahid muhammad Asif abdul Manan Sana Rashid Saima Rubab Khan Hafiz muhammad Arsalan Rabail Alam Mahwish Arooj Mahmood Husain Qazi Adeel Gulzar Ahmed Chaudhary Adel Mohammed abuzenadah Mohammed Hussain Al-Qahtani Sajjad Karim Center of Excellence in Genomic Medicine Research Faculty of Applied Medical SciencesKing Abdulaziz University Institute of Molecular Biology and Biotechnology the University of Lahore Fatima Jinnah Medical College Sir Gangaram Hospital Lahore Institute of Molecular Biology and Biotechnology the University of Lahore Department of Biotechnology and Informatics BUITEMS Quetta 87300 Pakistan Center for Research in Molecular Medicine the University of Lahore KACST Technology Innovation Center in Personalized Medicine King Abdulaziz University Center of Excellence in Genomic Medicine Research Faculty of Applied Medical Sciences King Abdulaziz University

Summary：A multi-centred study was designed to collect dengue epidemiologic data from government and registered private hospitals/clinics and maintained archive of frozen specimens in bio-bank to be used for future dengue epidemic control program, and assess the epidemiology of dengue fever（DF） by evaluating biochemical and oxidative status of patients. ELISA Ig M antibodies test was done to confirm DF. From August 2010 to December 2011, 101 confirmed blood samples of DF patients referred to pathology lab of Jinnah Hospital Lahore were subjected to the epidemiologic assessment by evaluating the biochemical and physiological indices and alterations of circulating antioxidants. Clinical features of DF patients and effect of fever on blood components and serum proteins of liver were recorded. The hospital stay in DF, dengue hemorrhagic fever（DHF） and dengue shock syndrome（DSS） showed significant difference. Significant increases in serum alanine amino transferase（ALT）（P=0.000）, aspartate amino transferase（AST）（P=0.000）, alkaline phosphatase（ALP）（P=0.000）, malondialdehyde（MDA） along with significant decreases in total protein（TP）（P=0.000）, reduced glutathione（GSH）（P=0.000）, superoxide dismutase（SOD）, catalase（CAT）（P=0.000）, and sialic acid contents（P=0.016） were observed. A positive correlation existed between bound sialic acid levels, liver enzymes and circulating antioxidants（r=0.656, P=0.016）. In the present study, alterations of circulating antioxidants in DF suggest that DF might be a metabolic response to an acute, self-limiting tropical viral infection, and a consequence of the viral inflammatory process.

关键词： dengue fever alanine amino transferase aspartate amino transferase malondialdehyde superoxide dismutase catalase

Combined metabolic activators improve cognitive functions in Alzheimer’s disease patients:a randomised,double-blinded,placebo-controlled phase-II trial

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Translational Neurodegeneration 2023年第1期12卷 849-871页

作者： Burak Yulug Ozlem Altay Xiangyu Li Lutfu Hanoglu Seyda Cankaya Simon Lam Halil aziz Velioglu Hong Yang Ebru Coskun Ezgi Idil Rahim Nogaylar Ahmet Ozsimsek Cemil Bayram Ismail Bolat Sena Oner Ozlem Ozdemir Tozlu Mehmet Enes Arslan Ahmet Hacimuftuoglu Serkan Yildirim muhammad arif Saeed Shoaie Cheng Zhang Jens Nielsen Hasan Turkez Jan Borén Mathias Uhlén Adil Mardinoglu Department of Neurology and Neuroscience Faculty of MedicineAlanya Alaaddin Keykubat UniversityAntalyaTurkey Science for Life Laboratory KTH-Royal Institute of TechnologyStockholmSweden Department of Neurology Faculty of MedicineIstanbul Medipol UniversityIstanbulTurkey Centre for Host-Microbiome Interaction’s Faculty of DentistryOral and Craniofacial SciencesKing’s College LondonLondonUK Department of Women’s and Children’s Health Karolinska InstituteStockholmSweden Functional Imaging and Cognitive-Affective Neuroscience Lab Istanbul Medipol Univer-sityIstanbulTurkey Department of Medical Pharmacology Faculty of Medi-cineAtatürk UniversityErzurumTurkey Department of Pathology Veterinary FacultyAtaturk UniversityErzurumTurkey Department of Molecular Biology and Genetics Faculty of ScienceErzurum Technical UniversityErzurumTur-key School of Pharmaceutical Sciences Zhengzhou UniversityZhengzhouPeople’s Republic of China Department of Biology and Biological Engineering Chalmers University of TechnologyGothenburgSweden Department of Medical Biology Faculty of MedicineAtatürk UniversityErzurumTurkey Department of Molecular and Clinical Medicine University of Gothenburg and Sahlgrenska University HospitalGothenburgSweden.

Background Alzheimer’s disease(AD)is associated with metabolic abnormalities linked to critical elements of *** recently administered combined metabolic activators(CMA)to the AD rat model and observed that CMA improves the AD-associated histological parameters in the *** promotes mitochondrial fatty acid uptake from the cytosol,facilitates fatty acid oxidation in the mitochondria,and alleviates oxidative *** Here,we designed a randomised,double-blinded,placebo-controlled phase-II clinical trial and studied the effect of CMA administration on the global metabolism of AD ***-dose CMA included 12.35 g L-serine(61.75%),1 g nicotinamide riboside(5%),2.55 g N-acetyl-L-cysteine(12.75%),and 3.73 g L-carnitine tartrate(18.65%).AD patients received one dose of CMA or placebo daily during the first 28 days and twice daily between day 28 and day *** primary endpoint was the difference in the cognitive function and daily living activity scores between the placebo and the treatment *** secondary aim of this study was to evaluate the safety and tolerability of CMA.A comprehensive plasma metabolome and proteome analysis was also performed to evaluate the efficacy of the CMA in AD *** We showed a significant decrease of AD Assessment Scale-cognitive subscale(ADAS-Cog)score on day 84 vs day 0(P=0.00001,29%improvement)in the CMA ***,there was a significant decline(P=0.0073)in ADAS-Cog scores(improvement of cognitive functions)in the CMA compared to the placebo group in patients with higher ADAS-Cog *** cognitive functions in AD patients were supported by the relevant alterations in the hippocampal volumes and cortical thickness based on imaging ***,the plasma levels of proteins and metabolites associated with NAD+and glutathione metabolism were significantly improved after CMA *** Our results indicate that treatment of AD patients with CMA can lead to enhanced cognit

关键词： Alzheimer’s disease Combined metabolic activators Multi-omics Systems biology Systems medicine

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机匣凹槽对轴流压气机性能的影响

风机技术 2021年第5期63卷 27-32,I0006页

作者： Naseem Ahmad Ghulam Ishaque arif aziz Zubair Ali Shah Mushayyed muhammad Ali Khan 郑群 Department of Mechanical Engineering Institute of Space TechnologyIslamabadPakistan College of Power and Energy Engineering Harbin Engineering UniversityHarbinChina College of Power and Energy Engineering Harbin Engineering UniversityHarbinChina

燃气轮机压气机的稳定运行范围由于每级最大负荷而减少。最大性能与稳定运行状态密切相关,如果运行状态发生一些快速变化,则会导致流动失稳,并导致旋转失速。为避免这种情况,应保持适当的失速裕度,使轴流压气机性能更好。通过叶尖和机... 详细信息

燃气轮机压气机的稳定运行范围由于每级最大负荷而减少。最大性能与稳定运行状态密切相关,如果运行状态发生一些快速变化,则会导致流动失稳,并导致旋转失速。为避免这种情况,应保持适当的失速裕度,使轴流压气机性能更好。通过叶尖和机匣壁面处理可以提高失速裕度。为提高轴流压气机的失速裕度,机匣处理被广泛用于被动流动控制。当前的CFD研究使用NASA转子37通过有限体积技术离散3D RANS方程来研究凹槽的性能。为了验证转子37,对一个通道进行了稳态仿真。仿真结果与总压比和效率的实验测量数据非常吻合。根据收敛标准来预测失速。提出了矩形端壁凹槽模型并进行了数值验证。对矩形凹槽和光滑壁面的性能进行对比评估,发现与光滑壁面相比,矩形凹槽的失速裕度增加了6.37%。通过安装凹槽使TLV减至最小,矩形CGCT模型减少了涡流停滞区,有助于延迟失速的发生。机匣凹槽显著提高了轴流压气机的失速裕度,但导致了效率的略微下降。

关键词：轴流压气机失速裕度最大负荷旋转失速稳态仿真机匣处理流动失稳稳定运行状态