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Experimental Study on Heat Storage Properties Comparison of Paraffin/Metal Foams Phase Change Material Composites

Journal of Thermal Science 2024年第2期33卷 469-478页

作者： waqar AHMED Abid HUSSAIN Hanzla SHAHID Imran ALI hafiz muhammad ALI Department of Mechanical Engineering University of Engineering and TechnologyTaxila47080Pakistan Department of Mechanical Engineering Institute of Space TechnologyIslamabadPakistan Department of Mechanical Mechatronics and Manufacturing EngineeringUniversity of Engineering and Technology LahoreFaisalabad CampusPunjabPakistan Mechanical Engineering Department King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Renewable Energy and Power Systems(IRC-REPS) King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia

Heat storage properties of phase change materials(PCMs) are essential characteristics that perform a key role in thermal heat energy storage *** thermal properties of PCMs can be improved by developing metal foam/PCM *** addition of metal foam in PCMs has a significant effect on the thermal characteristics of *** this paper,the heat storage properties of two different metal foam/PCM composites were experimentally *** behavior of paraffin in metal foam(copper and iron-nickel)/paraffin composites concerning pure paraffin at a constant heat flux of 1000 W/m^(2) in three directions simultaneously(x,y,and z) was *** was infiltrated into copper and iron-nickel foams to develop composite materials which resulted in enhancing the thermal conductivity of the paraffin.A comparative analysis is made on the heat storage properties of paraffin in copper and iron-nickel foams/paraffin *** temperature distribution during the phase transition process is experimentally *** comparison indicates that temperature uniformity in copper foam/paraffin composite is better than in iron-nickel foam/paraffin composite and pure paraffin at the same heat *** results show that at heat flux of 1000 W/m^(2),the heat storage time for copper foam/paraffin composite is 20.63% of that of iron-nickel foam/paraffin composite.

关键词： heat storage capacity paraffin/metal foam composite temperature uniformity heat storage rate phase transition process

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Progress in electrocatalytic nitrate reduction for green energy:Catalyst engineering,mechanisms,and techno-economic feasibility

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Journal of Energy Chemistry 2024年第8期95卷 380-406,I0009页

作者： hafiz muhammad Adeel sharif hafiz muhammad Farooq Khan Sadeeq Ullah Yuwei Wang muhammad Ahmad Bo Yang Changping Li muhammad Bilal Asif Research Center for Eco-Environmental Engineering Dongguan University of TechnologyDongguan 523808GuangdongChina College of Chemistry and Engineering Shenzhen UniversityShenzhen 518060GuangdongChina FMH College of Medicine and Dentistry LahorePakistan School of Environment and Civil Engineering Research Center for Eco-Environment EngineeringDongguan University of TechnologyDongguan 523106GuangdongChina Advanced Membranes and Porous Materials Center(AMPMC) Physical Sciences and Engineering(PSE)King Abdullah University of Science and Technology(KAUST)Thuwal 23955Saudi Arabia

Ammonia(NH_(3))is an irreplaceable chemical that has been widely demanded to keep the sustainable development of modern ***,its industrial production consumes a huge amount of energy and releases extraordinary greenhouse gases(GHGs),leading to various environmental *** the green production of ammonia is a great challenge,which has been extensively pursued in the last *** this review,the most promising strategy,electrochemical nitrate reduction reaction(e-NO_(3)RR),is comprehensively investigated to give a complete understanding of its development and mechanism and provide guidance for future ***,owing to the complex reactions and limited selectivity,a comprehensive understanding of the mechanisms is crucial to further development and ***,NO_(3)^(-)RR is a promising strategy for simultaneous water treatment and NH_(3)production.A detailed overview of the recent progress in NO_(3)^(-)RR for NH_(3)production with nontransition and transition metal based electrocatalysts is *** addition,critical advanced techniques,future challenges,and prospects are discussed to guide future research on transition metal-based catalysts for commercial NH_(3)synthesis by NO_(3)^(-)reduction.

关键词： Nitrate reduction Electrolysis Pollution to solution Transition metal catalysts Ammonia synthesis Green energy

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Elevating Image Steganography:A Fusion of MSB Matching and LSB Substitution for Enhanced Concealment Capabilities

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Computers, Materials & Continua 2024年第5期79卷 2923-2943页

作者： muhammad Zaman Ali Omer Riaz hafiz muhammad Hasnain Waqas sharif Tenvir Ali Gyu Sang Choi Department of Information Technology The Islamia University of BahawalpurBahawalpur63100Pakistan Department of Computer Science The Islamia University of BahawalpurBahawalpur63100Pakistan School of Computer Science and Engineering Yeungnam UniversityGyeongbuk38541Korea

In today’s rapidly evolving landscape of communication technologies,ensuring the secure delivery of sensitive data has become an essential *** overcome these difficulties,different steganography and data encryption methods have been proposed by researchers to secure *** of the proposed steganography techniques achieve higher embedding capacities without compromising visual imperceptibility using LSB *** this work,we have an approach that utilizes a combinationofMost SignificantBit(MSB)matching andLeast Significant Bit(LSB)*** proposed algorithm divides confidential messages into pairs of bits and connects them with the MSBs of individual pixels using pair matching,enabling the storage of 6 bits in one pixel by modifying a maximum of three *** proposed technique is evaluated using embedding capacity and Peak Signal-to-Noise Ratio(PSNR)score,we compared our work with the Zakariya scheme the results showed a significant increase in data concealment *** achieved results of ourwork showthat our algorithmdemonstrates an improvement in hiding capacity from11%to 22%for different data samples while maintaining a minimumPeak Signal-to-Noise Ratio(PSNR)of 37 *** findings highlight the effectiveness and trustworthiness of the proposed algorithm in securing the communication process and maintaining visual integrity.

关键词： Steganography most significant bit(MSB) least significant bit(LSB) peak signal-to-noise ratio(PSNR)

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基于SUACL的PWR灵敏度和不确定度分析

基于SUACL的PWR灵敏度和不确定度分析

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作者： hafiz muhammad waqar sharif 华北电力大学(北京)

学位级别：硕士

敏感性和不确定性分析对于评估反应堆的安全性,提高反应堆的经济性都具有重要意义。通过对压水堆燃料组件和堆芯进行不确定度分析,计算了核数据不确定度的传播。以OECD/NEA模型不确定度分析基准(UAM)为参考,对TMI-1反应堆进行了分析。... 详细信息

敏感性和不确定性分析对于评估反应堆的安全性,提高反应堆的经济性都具有重要意义。通过对压水堆燃料组件和堆芯进行不确定度分析,计算了核数据不确定度的传播。以OECD/NEA模型不确定度分析基准(UAM)为参考,对TMI-1反应堆进行了分析。此分析主要采用了国内自主开发的基于抽样方法的不确定度和敏感性分析程序SUACL和组件计算程序DRAGON3.06。核数据是反应堆设计的基础,是反应堆设计中主要的不确定度来源之一。本文对核数据引起的有效增殖因子及堆芯计算中子通量的不确定度进行了研究。基于ENDF/B-Ⅶ.1核评价数据库产生了协方差矩阵,然后利用程序SUACL产生了不同反应道的抽样样本,利用组件计算程序DRAGON3.06计算产-生了少群参数及系统的无限介质增殖因子的不确定度。分析得到的少群参数的不确定度与相关参考文献一致,同时,研究了基于统计抽样方法的敏感性系数计算方法,计算结果同直接微扰方法进行了对比,结果吻合良好。由此验证了基于统计抽样法进行敏感性系数和不确定性分析方法的正确性。除此之外,利用了堆芯计算程序TRIVAC对一个示例堆芯模型计算的中子通量密度的不确定进行了分析,此结果为将来进一步的分析打下了良好基础。

关键词：不确定性分析敏感性分析 SUACL DRAGON3.06

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Deep Learning-Enhanced Brain Tumor Prediction via Entropy-Coded BPSO in CIELAB Color Space

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Computers, Materials & Continua 2023年第11期77卷 2031-2047页

作者： Mudassir Khalil muhammad Imran sharif Ahmed Naeem muhammad Umar Chaudhry hafiz Tayyab Rauf Adham E.Ragab Department of Computer Engineering Bahauddin Zakariya UniversityMultan60000Pakistan Department of Computer Science Kansas State UniversityManhattanKS66506USA Department of Computer Science University of Management and TechnologyLahore54000Pakistan Centre for Smart Systems AI and CybersecurityStaffordshire UniversityStoke-on-TrentST42DEUK Industrial Engineering Department Collage of EngineeringKing Saud UniversityPO Box 800Riyadh11421Saudi Arabia

Early detection of brain tumors is critical for effective treatment *** tumors in their nascent stages can significantly enhance the chances of patient *** there are various types of brain tumors,each with unique characteristics and treatment protocols,tumors are often minuscule during their initial stages,making manual diagnosis challenging,time-consuming,and potentially *** techniques predominantly used in hospitals involve manual detection via MRI scans,which can be costly,error-prone,and *** automated system for detecting brain tumors could be pivotal in identifying the disease in its earliest *** research applies several data augmentation techniques to enhance the dataset for diagnosis,including rotations of 90 and 180 degrees and inverting along vertical and horizontal *** CIELAB color space is employed for tumor image selection and ROI *** deep learning models,such as DarkNet-53 and AlexNet,are applied to extract features from the fully connected layers,following the feature selection using entropy-coded Particle Swarm Optimization(PSO).The selected features are further processed through multiple SVM kernels for *** study furthers medical imaging with its automated approach to brain tumor detection,significantly minimizing the time and cost of a manual *** method heightens the possibilities of an earlier tumor identification,creating an avenue for more successful treatment planning and better overall patient outcomes.

关键词： Brain tumor deep learning feature extraction feature selection feature fusion transfer learning

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Perturbation of clopyralid on bio-denitrification and nitrite accumulation:Long-term performance and biological mechanism

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Environmental Science and Ecotechnology 2022年第1期9卷 27-39页

作者： Suyun Sun Ya-Nan Hou Wei Wei hafiz muhammad Adeel sharif Cong Huang Bing-Jie Ni Haibo Li Yuanyuan Song Caicai Lu Yi Han Jianbo Guo Tianjin Key Laboratory of Aquatic Science and Technology School of Environmental and Municipal EngineeringTianjin Chengjian UniversityTianjin300384China National Technology Innovation Center of Synthetic Biology Tianjin Institute of Industrial BiotechnologyChinese Academy of SciencesTianjin300308China Centre for Technology in Water and Wastewater School of Civil and Environmental EngineeringUniversity of Technology SydneySydneyNSW2007Australia College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen518060China

The contaminant of herbicide clopyralid(3,6-dichloro-2-pyridine-carboxylic acid,CLP)poses a potential threat to the ecological ***,there is a general lack of research devoted to the perturbation of CLP to the bio-denitrification process,and its biological response mechanism remains ***,long-term exposure to CLP was systematically investigated to explore its influences on denitrification performance and dynamic microbial *** showed that low-concentration of CLP(<15 mg/L)caused severe nitrite accumulation initially,while higher concentrations(35e60 mg/L)of CLP had no further effect after long-term *** mechanistic study demonstrated that CLP reduced nitrite reductase(NIR)activity and inhibited metabolic activity(carbon metabolism and nitrogen metabolism)by causing oxidative stress and membrane damage,resulting in nitrite ***,after more than 80 days of acclimation,almost no nitrite accumulation was found at 60 mg/L *** was proposed that the secretion of extracellular polymeric substances(EPS)increased from 75.03 mg/g VSS at 15 mg/L CLP to 109.97 mg/g VSS at 60 mg/L CLP,which strengthened the protection of microbial cells and improved NIR activity and metabolic ***,the biodiversity and richness of the microbial community experienced a U-shaped *** relative abundance of denitrification-and carbon metabolism-associated microorganisms decreased initially and then recovered with the enrichment of microorganisms related to the secretion of EPS and N-acyl-homoserine lactones(AHLs).These microorganisms protected microbe from toxic substances and regulated their interactions among interand *** study revealed the biological response mechanism of denitrification after successive exposure to CLP and provided proper guidance for analyzing and treating herbicide-containing wastewater.

关键词： Denitrification Nitrite accumulation Clopyralid Membrane damage Metabolism activity Microbial community

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TOL6BL突变导致减数分裂程序性DNA双链断裂无法产生和人类不孕

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Science Bulletin 2020年第24期65卷 2120-2129,M0006页

作者：焦玉莹樊岁兴 Nazish Jabeen 张欢 Ranjha Khan Ghulam Murtaza 蒋涵玮 Asim Ali 李阳鲍坚强张贝贝徐建泽许波 hafiz muhammad Jafar Hussain Qumar Zaman Ihsan Khan Ihtisham Bukhari Furhan Iqbal Ayesha Yousaf Sobia Dil Manan Khan Niaz Ahmad 马慧江小华张远伟史庆华 First Affiliated Hospital of University of Science and Technology of China Hefei National Laboratory for Physical Sciences at Microscalethe CAS Key Laboratory of Innate Immunity and Chronic DiseaseSchool of Basic Medical SciencesDivision of Life Sciences and MedicineCAS Center for Excellence in Molecular Cell ScienceCollaborative Innovation Center of Genetics and DevelopmentUniversity of Science and Technology of ChinaHefei 230027China Institute of Pure and Applied Biology Zoology DivisionBahauddin Zakariya UniversityMultan 60800Pakistan Shahbaz sharif District Hospital Multan 60800Pakistan

我们找到一个近亲婚配后代不育家系,该家系有3位非梗阻性无精子症患者和1位原因不明的女性不孕患者.全外显子组测序结合Sanger测序分析发现TOP6BL的c.483dup T突变在该家系中与不孕呈隐性共分离.正常的TOP6BL可与SPO11β结合进而导致减... 详细信息

我们找到一个近亲婚配后代不育家系,该家系有3位非梗阻性无精子症患者和1位原因不明的女性不孕患者.全外显子组测序结合Sanger测序分析发现TOP6BL的c.483dup T突变在该家系中与不孕呈隐性共分离.正常的TOP6BL可与SPO11β结合进而导致减数分裂程序性DNA双链断裂(DSBs)产生,而该突变破坏了二者的结合.对家系中一位男患者的精母细胞进行分析,发现其同源染色体联会异常,减数分裂不能到达粗线期,且染色体轴上缺少减数分裂重组蛋白RPA和DMC1信号,表明其减数分裂程序性DSBs未能产生.我们制备了携带类似患者突变的小鼠,发现突变雄鼠具有与男患者相同的减数分裂异常,突变雌鼠不孕,其卵母细胞中程序性DSBs和减数分裂重组也不能发生,卵母细胞不能成熟.这些发现表明TOP6BL突变可导致人类不孕,为相关不孕不育患者的病因诊断和人工辅助生殖胚胎的遗传检查提供了分子标靶.

关键词：全外显子组测序非梗阻性无精子症病因诊断近亲婚配染色体联会 DNA双链断裂减数分裂异常精母细胞

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