检索结果-南通市图书馆

Chinese Journal of Chemical Engineering 2019年第8期27卷 1895-1903页

作者： Marzia Rahman Md.Anamul Hoque Malik abdul Rub Mohammed abdullah khan Department of Chemistry Jahangirnagar UniversitySavarDhaka 1342Bangladesh Chemistry Department Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Center of Excellence for Advanced Materials Research King Abdulaziz UniversityJeddah 21589Saudi Arabia

Herein,conductivity measurements have been carried out to explore the interaction between cetyltrimethylammonium bromide(CTAB,a cationic surfactant) and antibiotic drug(cefixime trihydrate(CMT)) in water and also in occurrence of inorganic salts(NaCl,Na2 SO4 and Na3 PO4) over the temperature range of 303.15-323.15 K with an interval of 5 *** all cases,two critical micelle concentrations(c^*) were achieved for the CMT-surfactant *** of CMT drug to CTAB solution decreases the values of c^* which indicates the interaction between CMT and *** values of c^* for CMT-CTAB mixture in the presence of salts are lower in magnitude compared to the aqueous medium which indicates that micellization of the CMT-CTAB mixed system is favorable in salt *** values of △Gm^0 were obtained to be negative indicating the spontaneity of the micellization process and the extent of spontaneity further increases by means of rising *** obtained outcomes from the ΔHm^0 and ΔSm^0 values disclose that the interactions between CMT and CTAB are mostly electrostatic along with hydrophobic in *** thermodynamic parameters of transfer and enthalpy-entropy compensation phenomenon were also determined and discussed in detail.

关键词： Cefixime trihydrate CTAB Critical micelle concentration Compensation temperature Free energy of transfer

EFFECT OF NANO-FILLER DISPERSION ON THE THERMAL,MECHANICAL AND WATER SORPTION PROPERTIES OF GREEN ENVIRONMENTAL POLYMER

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2012年第5期30卷 735-743页

作者： Sher Bahadar khan Kalsoom Akhtar Jongchul Seo Haksoo Han Malik abdul Rub Center of Excellence for Advanced Materials Research King Abdulaziz UniversityJeddah 21589P.O.Box 80203Saudi Arabia Chemistry Department Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia Division of Nano Sciences and Department of Chemistry Ewha Womans UniversitySeoul 120-750Korea Department of Packaging Yonsei UniversityWonju-siKangwondo 220-710Korea Department of Chemical and Biomolecular Engineering Yonsei University262 SeongsannoSeodaemun-guSeoul 120-749Korea Center of Excellence for Advanced Materials Research King Abdulaziz UniversityJeddah 21589P.O.Box 80203Saudi Arabia Chemistry Department Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia

Partially exfoliated nanocomposite （2） has been synthesized by intercalation of poly（propylene carbonate）（PPC） into commercial clay, Cloisite 20B （PPC/C-20B）. Nanocomposite 2 was characterized phiso-chemically and exhibited high thermal, mechanical and anti-water sorption properties as compared to PPC and intercalated nanocomposite （1） of PPC/C- 20B having same amount of clay. TGA results revealed that the thermal decomposition temperature （Td, 50%） of 2 increased significantly, being 40 K and 17 K higher than that of pure PPC and 1, respectively, while DSC measurements indicated that the nano-filler dispersion of 2 increased the glass transition temperature from 21℃ to 31℃. Accordingly, 2 showed high elastic modulus, hardness and anti-water absorption capacity. These thermal, mechanical alad anti-water absorption improvements are of great importance for the application of PPC as packaging and biomaterials.

关键词： Poly(propylene carbonate) Cloisite 20B Nanocomposite Solution intercalation Thermal property Mechanicalproperty Water absorption property.

Modeling and Validation of Base Pressure for Aerodynamic Vehicles Based on Machine Learning Models

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2023年第12期137卷 2331-2352页

作者： Jaimon Dennis Quadros Sher Afghan khan abdul Aabid Muneer Baig Senior Lecturer of Mechanical Engineering University of BoltonRAK Academic CenterRas Al Khaimah16038UAE Department of Mechanical and Aerospace Engineering Faculty of EngineeringInternational Islamic University MalaysiaSelangor53100Malaysia Department of Engineering Management College of EngineeringPrince Sultan UniversityRiyadh11586Saudi Arabia

The application of abruptly enlarged flows to adjust the drag of aerodynamic vehicles using machine learning models has not been investigated *** process variables(Mach number(M),nozzle pressure ratio(η),area ratio(α),and length to diameter ratio(γ))were numerically explored to address several aspects of this process,namely base pressure(β)and base pressure with cavity(βcav).In this work,the optimal base pressure is determined using the PCA-BAS-ENN based algorithm to modify the base pressure presetting accuracy,thereby regulating the base drag required for smooth flow of aerodynamic *** on the identical dataset,the GA-BP and PSO-BP algorithms are also compared to *** data for training and testing the algorithmswas derived using the regression equation developed using the Box-Behnken Design(BBD).The results show that the PCA-BAS-ENN model delivered highly accurate predictions when compared to the other two *** a result,the advantages of these results are two-fold,providing:(i)a detailed examination of the efficiency of different neural network algorithms in dealing with a genuine aerodynamic problem,and(ii)helpful insights for regulating process variables to improve technological,operational,and financial factors,simultaneously.

关键词： High speed flow Mach number machine learning PCA-BAS-ENN algorithm

Acceleration of solar wind particles due to inertial Alfvén waves

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第6期76卷 137-141页

作者： Kiran Batool Imran A khan M Shamir abdul Kabir S Ayaz Theoretical Physics Department National Centre for PhysicsIslamabad 44000Pakistan Department of Space Sciences Institute of Space TechnologyIslamabad 44000Pakistan Space and Astrophysics Research Lab(SARL) National Center of GIS and Space Applications(NCGSA)Islamabad 44000Pakistan Salam Chair Department of PhysicsGC University LahoreKatchery RoadLahorePunjab 54000Pakistan Department of Space Science and CSPAR University of Alabama in HuntsvilleHuntsvilleAL 35899United States of America

Gaining an understanding of the effects and dynamics of the solar wind is crucial for the study of space weather,Earth's magnetosphere,spacecraft protection,the dynamics of the Solar System,and various other *** show that Alfvén waves effectively transfer energy to resonant *** study demonstrates how inertial Alfvén waves deliver their energy to resonant plasma particles in different solar environments under certain *** analysis shows that inertial Alfvén waves experience more rapid damping with increasing parallel wavenumber,ambient magnetic field strength,and particle number density,coupled with a decrease in *** rate of energy transfer to resonant particles intensifies with higher temperatures and reduced parallel wavenumber and particle number *** with higher initial velocities actively participate in Landau damping,especially in regions with a stronger ambient magnetic field.

关键词： solar wind inertial Alfven waves resonant particles

Applications of beneficial plant growth promoting rhizobacteria and mycorrhizae in rhizosphere and plant growth:A review

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2020年第5期13卷 199-208页

作者： Ashiq khan Zitong Ding Muhammad Ishaq Israr khan Anum Ali Ahmed abdul Qadir khan Xusheng Guo Key Laboratory of Grassland and Agro-ecosystems School of Life SciencesLanzhou UniversityLanzhou 730000China Department of Microbiology Balochistan University of Information Technology Engineering&Management Sciences Quetta 87300Pakistan Probiotics and Biological Feed Research Center Lanzhou UniversityLanzhou 730000China School of Life Sciences Institute of Microbiology Lanzhou UniversityLanzhou 730000China

Because of climate change and the highly growing world population,it becomes a huge challenge to feed the whole *** overcome this challenge and increase the crop yield,a large number of fertilizers are applied but these have many side *** of these,scientists have discovered beneficial rhizobacteria,which are environmentally friendly and may increase crop yield and plant *** microbial population of the rhizosphere shows a pivotal role in plant development by inducing its *** depends upon the valuable interactions among the roots and microbes for the growth,nutrients availability,growth promotion,disease suppression and other important roles for *** numerous secrets of microbes in the rhizosphere have been revealed due to huge development in molecular and microscopic *** review illustrated and discussed the current knowledge on the development,maintenance,interactions of rhizobacterial populations and various proposed mechanisms normally used by PGPR in the rhizosphere that encouraging the plant growth and alleviating the stress *** addition,this research reviewed the role of single and combination of PGPR,mycorrhizal fungi in plant development and modulation of the stress as well as factors affecting the microbiome in the rhizosphere.

关键词： rhizosphere plant growth promoting rhizobacteria mycorrhizae nitrogen fixing bacteria phosphate solubilizing bacteria

A survey on trust based detection and isolation of malicious nodes in ad-hoc and sensor networks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2015年第2期9卷 280-296页

作者： Adnan AHMED Kamalrulnizam ABU BAKAR Muhammad Ibrahim CHANNA Khalid HASEEB abdul Waheed khan Faculty of Computing Universiti Teknologi Malaysia Johor Bahru 81310 Malaysia Department of Information Technology Quaid-e-Awam University of Engineering Science and Technology Nawabshah 67450 Pakistan

Mobile ad-hoc networks （MANETs） and wireless sensor networks （WSNs） have gained remarkable apprecia- tion and technological development over the last few years. Despite ease of deployment, tremendous applications and significant advantages, security has always been a challeng- ing issue due to the nature of environments in which nodes operate. Nodes＇ physical capture, malicious or selfish behav- ior cannot be detected by traditional security schemes. Trust and reputation based approaches have gained global recog- nition in providing additional means of security for decision making in sensor and ad-hoc networks. This paper provides an extensive literature review of trust and reputation based models both in sensor and ad-hoc networks. Based on the mechanism of trust establishment, we categorize the state- of-the-art into two groups namely node-centric trust mod- els and system-centric trust models. Based on trust evidence, initialization, computation, propagation and weight assign- ments, we evaluate the efficacy of the existing schemes. Fi- nally, we conclude our discussion with identification of some unresolved issues in pursuit of trust and reputation manage- ment.

关键词： trust reputation wireless sensor network mo-bile ad-hoc networks routing node misbehavior

The effect of replacing pnictogen elements on the physical properties of SrMg_2X_2(X=N,P,As,Sb,Bi) Zintl compounds

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第4期27卷 369-375页

作者： G Murtaza abdul Ahad khan M Yaseen A Laref Naeem Ullah Inayat ur Rahman Materials Modelling Labortary Department of PhysicsIslamia College University Department of Physics University of the Peshawar Department of Physics University of AgricultureFaisalabad Department of Physics and Astronomy College of ScienceKing Saud University Department of Physics City University of Hong Kong

The effect of replacing the anion from N to Bi down the group in the periodic table is investigated on SrMg2X2（X = N,P,As,Sb,Bi）.A full potential linearized augmented plane wave plus local orbitals method is used along with different exchange–correlation potentials to obtain the lattice constants,phonons,electronic,and optical properties of the Sr Mg2X2（X = N,P,As,Sb,Bi） Zintl compounds.A good agreement is achieved and our calculations are validated by previous experimental and theoretical *** compounds have shown stable dynamical behavior with gamma centered longitudinal response having no imaginary *** band structures reveal the semiconducting nature of the *** Pnictogen（X）-p state contributed mainly in the valence band and the Sr-d state forms the conduction of the *** charge transfer and low overlapping of the atomic densities indicates the preferable ionic bonding character of these *** the optical properties,real and imaginary parts of dielectric function,complex refractive index,birefringence,reflectivity,and optical conductivity are *** compounds can be utilized in the optical and optoelectronic devices.

关键词： Zintl compounds band structure optical response

An unusual bioactive oleanane triterpenoid from Rhododendron campanulatum ***

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第5期22卷 575-579页

作者： Mudasir Ahmad Tantry Reehana khan Seema Akbar abdul Rouf Dar abdul Sami Shawl Mohammad Sarwar Alam Drug Standardisation Research Unit Regional Research Institute of Unani Medicine(CCRUM)Naseem Bagh CampusUniversity of KashmirSrinagar 190006KashmirIndia Natural Product Chemistry Division Indian Institute of Integrative Medicine(CSIR)SanatnagarSrinagar 190005KashmirIndia Department of Chemistry Jamia Hamdard UniversityHamdard NagarNew Delhi 110062India Bioorganic Chemistry Division Indian Institute of Integrative Medicine(CSIR)Canal RoadJammu Tawi 180001JammuIndia

An unusual oleanane triterpene（1） was isolated from aerial parts of Rhododendron *** compound had shown prominent antibacterial and immunomodulatory *** structure of the compound was determined by spectroscopic data... 详细信息

关键词： Rhododendron campanulatum Oleanane triterpenoid Antibacterial Immunomodulatory

Phase microstructure evaluation and microwave dielectric properties of (1-x)Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3–xCa_(0.6)La_(0.8/3)TiO_3 ceramics

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2018年第1期7卷 72-78页

作者： abdul MANAN Zahid ULLAH Arbab Safeer AHMAD Atta ULLAH Dil Faraz khan Arshad HUSSAIN Mati Ullah khan Laboratory for Research in Advanced Materials Department of Physics University of Science and TechnologyBannu Department of Physics Islamia College State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Department of Chemistry University of Science and Technology Department of Physics Kohat University of Science and Technology

All the compositions in the(1-x)Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3–xCa_(0.6)La_(0.8/3)TiO_3(0 ≤ x ≤ 0.2) series were fabricated using solid state sintering route. Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3 possessed excellent microwave dielectric properties with ε_r ≈ 17.1, Q_uf_0 ≈ 195855 GHz, and τ_f ≈-46 ppm/℃. t f was tuned through zero by mixing with Ca_(0.6)La_(0.8/3)TiO_3. In the present study, τ_f ≈-2 ppm/℃ with er ≈ 23.9 and high Q_uf_0 ≈ 115870 GHz was achieved for x = 0.15, i.e., for a mixture of 85% Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3–xCa_(0.6)La_(0.8/3)TiO_3.

关键词： phase microstructure density ilmenite structure

Unordered rule discovery using Ant Colony Optimization

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2014年第9期57卷 189-203页

作者： khan Salabat BAIG abdul Rauf ALI Armughan HAIDER Bilal khan Farman Ali DURRANI Mehr Yahya ISHTIAQ Muhammad Department of Computer Science COMSATS Institute of Information TechnologyAttock CampusPakistan Department of Computer Science National University of Computer and Emerging SciencesIslamabadPakistan Al Imam Mohammad Ibn Saud Islamic University (IMSIU) College of Computer and Information SciencesRiyadhSaudi Arabia

In this article,a novel unordered classification rule list discovery algorithm is presented based on Ant Colony Optimization(ACO).The proposed classifier is compared empirically with two other ACO-based classification techniques on 26 data sets,selected from miscellaneous domains,based on several performance *** opposed to its ancestors,our technique has the flexibility of generating a list of IF-THEN rules with unrestricted *** makes the generated classification model more comprehensible and easily *** results indicate that the performance of the proposed method is statistically significantly better as compared with previous versions of AntMiner based on predictive accuracy and comprehensibility of the classification model.

关键词： classification ant colony optimization data mining unordered rule set comprehensibility pattern recognition