检索结果-南通市图书馆

Integrated Mineral Analysis of sandstone and dolomite formations using different chelating agents during matrix acidizing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum 2019年第1期5卷 67-76页

作者： Mian Umer shafiq Hisham Khaled Ben Mahmud Mohsen Ghasemi Curtin University CDT 25098009 MiriSarawakMalaysia Curtin University Kent StreetBentleyPerth6102Australia

Mineral analysis plays a major role in the successful matrix acidizing as it shows the change in physiochemical changes in the formation due to the reaction with fluids *** of the reservoir can be altered by injecting mineral acids during matrix *** various complications are connected during the application of these acids such as environmental hazards,corrosion of pipes and tubings,precipitation of fluosilicates and fast spending of *** mitigate these problems,chelating agents have been applied as an alternative by different *** this study,three different chelating agents EDTA,GLDA and HEDTA were applied to stimulate sandstone and dolomite *** pH value of these chelates ranges from 1.7 to 3 and is measured before and after core flooding to observe physiochemical *** flooding experiments under 180F temperature were performed at a constant flow rate of 1 ml/min on core samples having dimensions(3 inch1.5 inch).Porosity,permeability,Inductively Coupled Plasma(ICP),and TESCAN Integrated Mineral Analysis(TIMA)were employed to measure changes in formation properties such as morphology,topology and *** reacted sample of acids was analyzed for sodium,potassium,calcium,aluminium,magnesium,and iron using the ICP technique to find the capability of these chelates to remove positive *** found to be effective in chelating iron,calcium and magnesium and it also removed some amount of aluminium ions from the sandstone *** and porosity analysis concluded that HEDTA is more efficient in creating new big pore *** analysis confirms that HEDTA is effective in dissolving quartz and other positive ions while dissolved a large amount of calcium and sodium from the sandstone as compared to other *** analysis also concluded that HEDTA is effective in increasing porosity of sandstone formation while GLDA is effective in dolomites.

关键词： sandstone matrix porosity

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2018年第10期36卷 1106-1111页

作者： Sardar Ahmad M.shafiq Rashid Ahmad S.Jalali-Asadabadi Iftikhar Ahmad Department of Chemistry University of Malakand Center for Computational Materials Science University of Malakand Department of Physics Abbottabad University of Science and Technology Department of Physics Faculty of SciencesUniversity of Isfahan

In this paper, we explored the structural, elastic and mechanical properties of the strongly correlated electron systems, intermetallic Ln-Au（Ln = Ce, Pr, Nd, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu） in cubic structure,using PF-LAPW method within the density functional theory. Structural properties of these intermetallics were investigated by treating the exchange-correlation potential with the GGA-PBE, GGA-PBEsol and GGA ＋ U. The effectiveness of the U for the structural properties as compared to other methods confirms the strong correlated nature of these compounds and the calculated lattice constants endorse the divalency of Yb. The results demonstrate the stable cubic CsCl structure of these compounds. Bulk modulus, Young＇s modulus, shear modulus, B/G ratio, Cauchy pressure, Poisson＇s ratio, anisotropic ratio,Kleinman parameters and Lame＇s coefficients were studied using the PBEsol to evaluate their importance in various types of engineering applications. The most prominent features of these compounds are their ductility, very high melting points, resistance to corrosion, and anisotropic nature.

关键词： Strongly correlated electron systems Rare-earth monoaurides Mechanical properties Ab-initio calculation

Cobalt protoporphyrin-induced nano-self-assembly for CT imaging,magnetic-guidance,and antioxidative protection of stem cells in pulmonary fibrosis treatment

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2023年第3期21卷 129-141页

作者： Yimeng Shu Ming Ma Xiaoxia Pan Muhammad shafiq Huizhu Yu Hangrong Chen State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai200050PR China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049PR China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences1 Sub-laneXiangshanHangzhou310024PR China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai200438PR China Department of Biotechnology Faculty of Science and TechnologyUniversity of Central Punjab(UCP)Lahore54000Pakistan

Mesenchymal stem cells(MSCs)transplantation is a promising approach for pulmonary fibrosis(PF),however it is impeded by several persistent challenges,including the lack of long-term tracking,low retention,and poor survival of MSCs,as well as the low labeling efficiency of ***,a cobalt protoporphyrin IX(CoPP)aggregation-induced strategy is applied to develop a multifunctional nano-self-assembly(ASCP)by combining gold nanoparticle(AuNPs),superparamagnetic iron oxide nanoparticles(SPIONs),and CoPP through a facile solvent evaporation-driven *** no additional carrier materials are employed during the synthesis,high loading efficiency of active ingredients and excellent biocompatibility are ***,facile modification of the ASCPs with bicyclo[6.1.0]nonyne(BCN)groups(named as ASCP-BCN)enables them to effectively label MSCs through bioorthogonal *** obtained ASCP-BCN could not only help to track MSCs with AuNP-based computed tomography(CT)imaging,but also achieve an SPIONs-assisted magnetic field based improvement in the MSCs retention in lungs as well as promoted the survival of MSCs via the sustained release of *** in vivo results demonstrated that the labeled MSCs improved the lung functions and alle-viated the fibrosis symptoms in a bleomycin–induced PF mouse ***,a novel ASCP-BCN multi-functional nanoagent was developed to bioorthogonally-label MSCs with a high efficiency,presenting a promising potential in the high-efficient MSC therapy for PF.

关键词： Self-assembly Pulmonary fibrosis Cell labeling Stem cell therapy Theranostic

Recent Advancements on Three‑Dimensional Electrospun Nanofiber Scaffolds for Tissue Engineering

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advanced Fiber Materials 2022年第5期4卷 959-986页

作者： Yujie Chen Xutao Dong Muhammad shafiq Gregory Myles Norbert Radacsi Xiumei Mo Shanghai Engineering Research Center of Nano‑Biomaterials and Regenerative Medicine State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of ChemistryChemical Engineering and BiotechnologyDonghua UniversitySongjiangShanghai 201600China School of Engineering Institute for Materials and ProcessesThe University of EdinburghKing’s BuildingsEdinburgh EH93FBUnited Kingdom

Electrospinning is widely accepted as a technique for the fabrication of nanofibrous three-dimensional(3D)scaffolds which mimic extracellular matrix(ECM)microenvironment for tissue engineering(TE).Unlike normal densely-packed two-dimensional(2D)nanofibrous membranes,3D electrospun nanofiber scaffolds are dedicated to more precise spatial control,endowing the scaffolds with a sufficient porosity and 3D environment similar to the in vivo settings as well as optimizing the properties,including injectability,compressibility,and ***,the 3D morphology regulates cellular interaction and mediates growth,migration,and differentiation of cell for matrix *** variation among scaffold structures,functions and applications depends on the selection of electrospinning materials and methods as well as on the post-processing of electrospun *** review summarizes the recent new forms for building electrospun 3D nanofiber scaffolds for TE applications.A variety of approaches aimed at the fabrication of 3D electrospun scaffolds,such as multilay-ering electrospinning,sacrificial agent electrospinning,wet electrospinning,ultrasound-enhanced electrospinning as well as post-processing techniques,including gas foaming,ultrasonication,short fiber assembly,3D printing,electrospraying,and so on are discussed,along with their advantages,limitations and ***,the current challenges and prospects of 3D electrospun scaffolds are rationally discussed,providing an insight into developing the vibrant fields of biomedicine.

关键词： Electrospun Nanofibers Three-dimensional Tissue engineering Regenerative medicine Scaffold Polymer

A Secure Key Agreement Scheme for Unmanned Aerial Vehicles-Based Crowd Monitoring System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第3期70卷 6141-6158页

作者： Bander Alzahrani Ahmed Barnawi Azeem Irshad Areej Alhothali Reem Alotaibi Muhammad shafiq Faculty of Computing and Information Technology King Abdulaziz UniversityJeddahSaudi Arabia Department of Computer Science and Software Engineering International Islamic University IslamabadPakistan Department of Information and Communication Engineering Yeungnam UniversityGyeongsan38541Korea

Unmanned aerial vehicles(UAVs)have recently attractedwidespread attention in civil and commercial *** example,UAVs(or drone)technology is increasingly used in crowd monitoring solutions due to its wider air footprint and the ability to capture data in real ***,due to the open atmosphere,drones can easily be lost or captured by attackers when reporting information to the crowd management *** addition,the attackers may initiate malicious detection to disrupt the crowd-sensing communication ***,security and privacy are one of the most significant challenges faced by drones or the Internet of Drones(IoD)that supports the Internet of Things(IoT).In the literature,we can find some authenticated key agreement(AKA)schemes to protect access control between entities involved in the IoD ***,the AKA scheme involves many vulnerabilities in terms of security and *** this paper,we propose an enhancedAKAsolution for crowdmonitoring applications that require secure communication between drones and controlling *** scheme supports key security features,including anti-forgery attacks,and confirms user *** security characteristics of our scheme are analyzed byNS2 simulation and verified by a random oracle *** simulation results and proofs show that the proposed scheme sufficiently guarantees the security of crowd-aware communication.

关键词： IoT unmanned aerial vehicles authentication crowd monitoring

An enhanced authentication protocol for client server environment

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 2020年第6期14卷 193-195页

作者： Muhammad Asad SALEEM shafiq AHMED Khalid MA HMOOD Saru KUMARI Hu XIONG Department of Computer Science COMSATS University IslamabadSahiwal Campus 57000Pakistan Department of Mathematics Ch.Charan Singh UniversityMeerutUtter Paradesh 250002India School of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610000China

1 Introduction and our contributions Remote user access has become very easy because of different functions provided by rapid development in internet *** providing access to system the responsibility of the system does not limit *** system must implement some sort of security framework otherwise an adversary may disturb or use the resources of the system without seeking permission.

关键词： client server Remote

Detailed approach toward the anti-hyperglycemic potential of Sterculia diversifolia *** against alloxan-induced in vivo hyperglycemia model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 2022年第1期42卷 17-22页

作者： Fazle Rabbi Amir Zada Amna Nisar Achyut Adhikari Irfan Ullah shafiq Ur Rahman Department of Pharmacy Abasyn University PeshawarPeshawar 25000Khyber PakhtunkhwaPakistan Department of Pharmacy University of PeshawarPeshawar 25120Khyber PakhtunkhwaPakistan Central Department of Chemistry Tribhuvan UniversityKritipur 44613KathmanduNepal Department of Pharmacy Sarhad University of Science and Information TechnologyPeshawar25000Khyber PakhtunkhwaPakistan Department of Pharmacy Shaheed Benazir Bhutto UniversitySheringalDir(Upper)18000Khyber PakhtunkhwaPakistan

OBJECTIVE:To investigate Sterculia diversifolia *** for potential anti-diabetic activity in the in vivo mouse model of alloxan-induced ***:Sterculia diversifolia(***)was subjected to extraction and isolation techniques and structural characterization of the isolated compounds were performed using spectroscopic *** acute toxicity test was performed by orally administering *** in doses of 500-2000 mg/*** the assessment of anti-hyperglycemic activity,*** bark and leaves extracts were administered orally in doses of 50,100,and 200 mg/kg,along with metformin(150 mg/kg,i.p)as positive control,after confirmation of alloxan(150 mg/kg,i.p.)induced hyperglycemia in BALB/c *** biochemical parameters were monitored for the period of ***:The phytochemical studies showed the presence of quercetin and kaempferol in *** IC50 values in the in vivo acute toxicity study revealed the safety margin of *** bark(1166.66 mg/kg)and leaves(683.34 mg/kg)extracts.A significant attenuation of alloxan induced hyperglycemia was produced by *** extracts at 50 mg/kg(P<0.05),100 mg/kg(P<0.05,<0.01),and 150 mg/kg(P<0.05,<0.01,<0.001)during 1-4 h,which was comparable to metformin(P<0.001).Significant(P<0.001)improvement appeared in blood hemoglobin,protein,cholesterol,triglycerides,urea,creatinine,HDL,and LDL of the stem bark and leaves extracts treated diabetic ***:These findings connote the usefulness of *** as an anti-diabetic in traditional medicine and this might be attributed to the presence of quercetin and kaempferol,among other phytochemicals.

关键词： Sterculia hypoglycemic agents quercetin Kaempferols biochemical parameters

同方期刊数据库

Impact of Joule heating and multiple slips on a Maxwell nanofluid flow past a slendering surface

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2022年第1期74卷 1-15页

作者： Hijaz Ahmadand shafiq Ahmad Muhammad Naveed Khan Sohail Nadeem Aysha Rehman Hijaz Ahmad Rifaqat AN Department of Mathematics Quaid-I-Azam University 45320Islamabad 44000Pakistan Department of Mathematics University of GujratGujrat50700 Pakistan Section of Mathematics International Telematic University UninettunoCorso Vittorio Emanuele II3900186 RomaItaly Department of Mathematics College of Science and ArtsMuhayilKing Khalid University 9004AbhaSaudi Arabia

This manuscript presents a study of three-dimensional magnetohydrodynamic Maxwell nanofluid flow across a slendering stretched surface with Joule *** impact of binary chemical reactions,heat generation,thermal radiation,and thermophoretic effect is also taken into *** multiple slip boundary conditions are utilized at the boundary of the *** appropriate similarity variable is used to transfer the flow modeled equations into ODEs,which are numerically solved by the utilization of the MATLAB bvp4c *** involved parameter's impact on the concentration,velocity,and temperature distribution are scrutinized with *** transport rates(mass,heat)are also investigated using the same variables,with the results reported in tabulated *** is seen that the fluid relaxation,magnetic,and wall thickness characteristics diminish the velocities of ***,the velocity,concentration,and temperature slip parameters reduce the velocities of fluid,temperature,and concentration *** results are compared to existing studies and shown to be in dependable agreement.

关键词： Maxwell nanofluid slendering stretching surface Joule heating thermal radiation thermophoretic effect

Real-Time Multiple Guava Leaf Disease Detection from a Single Leaf Using Hybrid Deep Learning Technique

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第1期74卷 1235-1257页

作者： Javed Rashid Imran Khan Ghulam Ali shafiq ur Rehman Fahad Alturise Tamim Alkhalifah Department of CS&SE Islamic International UniversityIslamabad44000Pakistan Department of IT Services University of OkaraOkara56310Pakistan Department of CS University of OkaraOkara56310Pakistan Department of Botany University of OkaraOkara56310Pakistan Department of Computer College of Science and Arts in Ar RassQassim UniversityAr RassQassim52571Saudi Arabia

The guava plant has achieved viable significance in subtropics and tropics owing to its flexibility to climatic environments,soil conditions and higher human *** is cultivated in vast areas of Asian and Non-Asian countries,including *** guava plant is vulnerable to diseases,specifically the leaves and fruit,which result in massive crop and profitability *** existing plant leaf disease detection techniques can detect only one disease from a ***,a single leaf may contain symptoms of multiple *** study has proposed a hybrid deep learning-based framework for the real-time detection of multiple diseases from a single guava leaf in several ***,Guava Infected Patches Modified MobileNetV2 and U-Net(GIP-MU-NET)has been proposed to segment the infected guava *** proposed model consists of modified MobileNetv2 as an encoder,and the U-Net model’s up-sampling layers are used as a decoder ***,the Guava Leaf SegmentationModel(GLSM)is proposed to segment the healthy and infected *** the final step,the Guava Multiple Leaf Diseases Detection(GMLDD)model based on the YOLOv5 model detects various diseases from a guava *** self-collected datasets(the Guava Patches Dataset and the Guava Leaf Diseases Dataset)are used for training and *** proposed method detected the various defects,including five distinct classes,i.e.,anthracnose,insect attack,nutrition deficiency,wilt,and *** average,the GIP-MU-Net model achieved 92.41%accuracy,the GLSM gained 83.40%accuracy,whereas the proposed GMLDD technique achieved 73.3%precision,73.1%recall,71.0%mAP@0.5 and 50.3 mAP@0.5:0.95 scores for all the aforesaid classes.

关键词： Guava leaf diseases guava leaf segmentation guava patches segmentation multiple leaf diseases guava leaf diseases dataset