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Graphene Nanosheets Decorated with Copper Oxide Nanoparticles for the Photodegradation of Methylene Blue

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Chemical Research in Chinese Universities 2022年第6期38卷 1518-1525页

作者： Samavia RAFIQ Zulfiqar Ali RAZA muhammad ASLAM muhammad junaid BAKHTIYAR Department of Applied Sciences National Textile UniversityFaisalabad37610Pakistan

Textile industries extensively use colorants,such as methylene blue,and if disposed off untreated,they contaminate the effluent streams,causing a severe impact on the environment and aquatic *** degradation has been found as an inevitable approach to treat ***,we decorated the copper oxide nanoparticles on graphene nanosheets during the reflux *** resultant copper oxide/graphene nanocomposites were analyzed for structural and functional *** was observed that on increasing the copper oxide contents,the z-average size of the resultant nanocomposites *** X-ray diffraction analysis demonstrated the crystalline nature of the *** surface morphology of the copper oxide nanoparticles appeared to be spherical and that of the copper oxide/graphene composite somehow *** infrared analysis indicated successful intercalation of precursors in the *** bandgap of copper oxide/graphene nanocomposites varied in the range of 1.03—1.30 eV,which indicated their effective photocatalytic *** results demonstrated that after 120 min of exposure,the methylene blue removal efficiency reached 94.0%,92.2%,and 89.4%(mass fraction)on the copper oxide/graphene nanocomposite at copper oxide nanoparticles to graphene nanosheets ratios of 1:1,1.5:1,and 2:1(mass ratio),*** photodegradation performance of the prepared nano-catalyst was found satisfactory even after five cycles.

关键词： Copper oxide Graphene nanosheet Methylene blue Photocatalysis

Genomic insights into citrus domestication and its important agronomic traits

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Plant Communications 2021年第1期2卷 29-44页

作者： muhammad junaid Rao Hao Zuo Qiang Xu Key Laboratory of Biology and Genetic Improvement of Horticultural Crops Ministry of AgricultureKey Laboratory of Horticultural Plant Biology(Ministry of Education)Huazhong Agricultural UniversityWuhanHubei 430070P.R.China

Citrus originated in Southeast Asia,and it has become one of the most important fruit crops *** has a long and obscure domestication history due to its clonal propagation,long life cycle,wide sexual compatibility,and complex genetic *** the genomic information of both wild and cultivated citrus becomes available,their domestication history and underlying traits or genes are becoming *** review outlines the genomic features of wild and cultivated *** propose that the reduction of citric acid is a critical trait for citrus *** genetic model representing the change during domestication may be associated with a regulatory complex known as WD-repeat-MYB-bHLH-WRKY(WMBW),which is involved in acidification and anthocyanin *** reduction in or loss of anthocyanins may be due to a hitchhiking effect of fruit acidity selection,in which mutation occurs in the common regulator of these two pathways in some domesticated ***,we have summarized the domestication traits and candidate genes for breeding *** review represents a comprehensive summary of the genes controlling key traits of interest,such as acidity,metabolism,and disease *** also sheds light on recent advances in early flowering from transgenic studies and provides a new perspective for fast breeding of *** review lays a foundation for future research on fruit acidity,flavor,and disease resistance in citrus.

关键词： citrus domestication fruit acidity genome wild germplasm

Process development for green part printing using binder jetting additive manufacturing

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Frontiers of Mechanical Engineering 2018年第4期13卷 504-512页

作者： Hadi MIYANAJI Morgan ORTH junaid muhammad AKBAR Li YANG Department of Industrial Engineering University of Louisville Louisville KY 40292 USA Department of Mechanical Engineering University of LouisvilleLouisville KY 40292 USA

Originally developed decades ago, the binder jetting additive manufacturing （B J-AM） process possesses various advantages compared to other additive manufacturing （AM） technologies such as broad material compat- ibility and technological expandability. However, the adoption of B J-AM has been limited by the lack of knowledge with the fundamental understanding of the process principles and characteristics, as well as the relatively few systematic design guideline that are available. In this work, the process design considerations for B J-AM in green part fabrication were discussed in detail in order to provide a comprehensive perspective of the design for additive manufacturing for the process. Various process factors, including binder saturation, in- process drying, powder spreading, powder feedstock characteristics, binder characteristics and post-process curing, could significantly affect the printing quality of the green parts such as geometrical accuracy and part integrity. For powder feedstock with low flowability, even though process parameters could be optimized to partially offset the printing feasibility issue, the qualities of the green parts will be intrinsically limited due to the existence of large internal voids that are inaccessible to the binder. In addition, during the process development, the balanced combination between the saturation level and in-process drying is of critical importance in the quality control of the green parts.

关键词： binder jetting additive manufacturing green part process optimization process development

Green corrosion inhibitors intercalated Mg:Al layered double hydroxide coatings to protect Mg alloy

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Rare Metals 2021年第8期40卷 2254-2265页

作者： muhammad junaid Anjum Jing-Mao Zhao Vahdat Zahedi Asl muhammad Uzair Malik Ghulam Yasin Waheed Qamar Khan College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing100029China Beijing Key Laboratory of Electrochemical Process and Technology for Materials Beijing100029China Institute of Advanced Materials Bahauddin Zakariya UniversityMultan60800Pakistan

Mg alloy was protected with Mg:Al layered double hydroxide(LDH)coating intercalated with three green corrosion inhibitors(sodium benzoate,3-aminopropyltriethoxysilane and 8-hydroxyquinoline).The in-situ hydrothermal approach was adopted to intercalate corrosion inhibitors into Mg:Al LDH *** intercalated Mg:Al LDH coating was successfully acquired,and the crystalline structure of Mg:Al LDH coating was verified with X-ray diffraction(XRD).The organic functional groups of corrosion inhibitors were identified with the help of Fourier transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS).The compact and uniform morphology was confirmed by scanning electron microscopy(SEM).The electrochemical measurement revealed better corrosion resistance of corrosion inhibitorintercalated Mg:Al LDH coatings as compared to that of pristine Mg *** corrosion protection mechanism of corrosion inhibitors was described and unearthed the corrosion inhibitor with the best performance.

关键词： Magnesium Layered double hydroxide coating Organic inhibitors Intercalation Corrosion resistance

Effect of Coal Fly Ash on Moisture Susceptibility and Fatigue Performance of Bone Glue Modified Asphalt

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Effect of Coal Fly Ash on Moisture Susceptibility and Fatigu...

作者： muhammad junaid 东南大学

学位级别：硕士

The use of waste,alternative and cheap materials in the construction of new roads and for the maintenance of existing roads are increasing day by *** main purpose of incorporation waste in binder is typical binders cannot meet the current requirements of flexible asphalt pavement due to increase of heavy traffic loads and *** and cheap materials are becoming popular due to their incomparable properties as a binder *** main purpose of this study is to improve the performance of asphalt binder with the help of sustainable and cheap *** glue and fly ash are one of those cheap and waste materials that may enhance the engineering properties of the flexible asphalt *** glue as an additive enhances the performance characteristics of the binder but have not a considerable effect against fatigue resistance and durability of the *** focus of this study is to use coal fly ash with bone glue（biomaterial derived from animal wastes）modified asphalt to check the effect of coal fly ash towards fatigue resistance and moisture *** study combined 60/70 penetration grade binder with optimum percentage of bone glue（10%）and 2%,4%,6% and 8% of fly *** optimum percentage of bone glue has decided from *** conducting consistency tests and some mixture tests,it is concluded that fly ash gives superior fatigue life to flexible asphalt pavement and the effect towards moisture sensitivity is slightly good as compared to the previous study in which only bone glue was used as an *** dynamic modulus also improved after the addition of *** ideal percentages of additives that gives best results are 10% Bone glue with 6% Coal Fly Ash in asphalt *** final results revealed that fly ash is suitable additive for the improvement of fatigue life of flexible asphalt pavement.

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Simulation Analysis of DC Fault Interruption Characteristics of Superconducting Electric Aircraft Propulsion

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1834-1842页

作者： muhammad junaid Xiaolong Yu Shuzhi Cao Wenqing Yu Dongsheng Zuo Jianhua Wang School of Electrical Engineering Nanhu CampusChina University of Mining and TechnologyXuzhouJiangsu 221116China Shanghai Dianji University Shanghai 201306China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’anShaanxi 710049China

Environmental issues associated with the aviation industry are getting more attention as air traffic *** standards are imposed for fuel consumption and pollution emissions for next-generation *** electrical propulsion aircraft(SEPA)have been seen as an efficient way to achieve this ***-temperature superconducting(HTS)devices are extensively used in the power system to supply enormous *** is distributed to the different loads via a DC distribution ***,it will generate an inrush current over ten times higher than the rated current in short-circuit state,which is very harmful to the ***,it is essential to adopt an appropriate protection *** paper discusses one protection scheme that combines DC vacuum circuit breakers(DC VCB)and resistive superconducting current limiters(RSFCL)for superconducting aircraft *** problems of cost and loss,the auxiliary capacitor is pre-charged by system voltage,and mechanical elements extinguish the ***,combined with RSFCL,the interrupting environment is fully *** limits fault current,and then the VCB breaks this limited current based on creating an artificial current zero(ACZ).The prospective rated power is 8MW,rated voltage and current are 4 kV and 1 kA,*** this paper,we discuss and simulate switching devices that protect *** interrupting performance of the circuit breaker is analysed in the DC short-circuit fault that occurs on the transmission ***,the residual energy consumption of different situations is calculated.A comparison is made between using RSFCL with metal oxide varistor(MOV)and just using *** scheme with RSFCL shows a significant advantage in energy consumption.

关键词： Artificial current zero DC circuit breakers metal oxide varistor RSFCL superconducting electrical propulsion aircraft

How Physical Disturbance and Nitrogen Addition Affect the Soil Carbon Decomposition?

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Phyton-International Journal of Experimental Botany 2022年第9期91卷 2087-2097页

作者： muhammad junaid Nazir Xiuwei Zhang Daolin Du Feihai Yu Institute of Wetland Ecology&Clone Ecology/Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation Taizhou UniversityTaizhou318000China College of the Environment&Safety Engineering Jiangsu UniversityZhenjiang212013China

The decomposition of soil organic carbon(SOC)plays a critical role in regulating atmospheric CO_(2)concentrations and climate ***,the mechanisms and factors controlling SOC decomposition are still not fully ***,we conducted a 60 days incubation experiment to test the effects of physical disturbance and nitrogen(N)addition on SOC decomposition.N addition increased the concentration of NO3-by 51%in the soil,but had little effect on the concentration of NH4+.N addition inhibited SOC decomposition,but such an effect differed between disturbed and undisturbed *** disturbed and undisturbed soils,application of N decreased SOC decomposition by 37%and 15%,*** possible explanation is that extra N input suppressed microbial N mining and/or increased the stability of soil organic matter by promoting the formation of soil aggregates and incorporating part of the inorganic N into organic matter,and consequently decreased microbial mineralization of soil organic *** disturbance intensified the inhibition of N on SOC decomposition,likely because physical disturbance allowed the added N to be better exposed to soil microbes and consequently increased the availability of added *** conclude that physical disturbance and N play important roles in modulating the stability of SOC.

关键词： Soil organic matter physical disturbance microbial N mining microbial biomass carbon N availability

Simulation study of integrated‐gate‐commutated‐thyristor based superconducting hybrid direct current circuit breaker

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High Voltage 2023年第6期8卷 1275-1284页

作者： muhammad junaid Wenqing Yu Shuzhi Cao Xiaolong Yu Dongsheng Yu Weilin Zong Jianhua Wang School of Electrical Engineering China University of Mining and TechnologyXuzhouChina State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anChina

With the development of a distributed generation,direct current(DC)load and energy‐storage equipment,voltage‐source‐converter‐based medium‐voltage DC systems(VSC‐MVDC)have attracted more attention due to its low power consumption,high reliability,independent power control and so ***,VSC‐MVDC has the problem of DC fault isolation,which requires the fast‐acting DC circuit‐breakers to isolate faulty lines and ensure low *** problem can be solved by coordinating resistive type superconducting‐fault‐current‐limiter(R‐SFCL)and integrated‐gate‐commutated‐thyristor(IGCT)based hybrid circuit *** on this,IGCT based superconducting DC circuit breaker(SDCCB)is proposed and *** R‐SFCL with IGCT could realise large current limiting and interruption and ensure low *** addition,the IGCT based hybrid DC circuit breaker(IGCT‐HDCCB)is compared with the traditional insulated gate bipolar transistor(IGBT)based hybrid DC circuit breaker(IGBT‐HDCCB)to evaluate which circuit breaker is more suitable for VSC‐*** results show that,coordination based on R‐SFCL and SDCCB,the fault current is successfully limited from 17.6 to 2.1 kA,and then inter-rupted within 3.8 *** addition,IGCT‐HDCCB overcomes the disadvantage that IGCT has less interrupting capacity than IGBT,retains the advantage of low cost of IGCT and is more suitable for MVDC system.

关键词： bipolar fault overcome

2D MXene Ti_(3)C_(2)T_(x)Enhanced Plasmonic Absorption in Metasurface for Terahertz Shielding

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Computers, Materials & Continua 2023年第5期75卷 3453-3464页

作者： Zaka Ullah Muath Al Hasanl Ismail Ben Mabrouk muhammad junaid Fawad Sheikh Faculty of Electrical Engineering College of EngineeringAl Ain UniversityAl Ain64141UAE Department of Electrical Engineering Durham UniversityDurhamUK Department of Electrical Engineering Baluchistan University of Technology and management sciencesQuettaPakistan Institute of Digital Signal Processing Universitat Duisburg EssenDuisburgGermany

With the advancement of technology,shielding for terahertz(THz)electronic and communication equipment is increasingly *** metamaterial absorption technique is mostly used to shield electromagnetic interference(EMI)in THz sensing *** most widely used THz metamaterial absorbers suffer from their narrowband properties and the involvement of complex fabrication *** with multifunctional properties,such as adjustable conductivity,broad bandwidth,high flexibility,and robustness,are driving future development to meet THz shielding *** this article,a theoretical simulation approach based on finite difference time domain(FDTD)is utilized to study the absorption and shielding characteristics of a two-dimensional(2D)MXene Ti_(3)C_(2)T_(x) metasurface absorber in the THz *** proposed metamaterial structure is made up of a square-shaped array of MXene that is 50 nmthick and is placed on top of a silicon *** bottom surface of the silicon is metalized with gold to reduce the transmission and ultimately enhance the absorption at 1–3 *** symmetric adjacent space between theMXene array results in a widening of *** proposed metasurface achieves 96%absorption under normal illumination of the incident source and acquires an average of 25 dB shielding at 1 THz bandwidth,with the peak shielding reaching 65 *** results show that 2D MXene-based stacked metasurfaces can be proven in the realization of low-cost devices for THz shielding and sensing applications.

关键词： EMI shielding terahertz plasmonic absorber metasurface