检索结果-南通市图书馆

Journal of iron and Steel Research international 2020年第4期27卷 433-439页

作者： Le Zhang Wei Wang m.Babar shahzad Yi-yin Shan Ke Yang institute of metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina School of materials Science and Engineering University of Science and Technology of ChinaHefei 230026AnhuiChina Key Laboratory of Nuclear materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina

A 5-layer laminated metal composite composed of ultrahigh-strength maraging steel and ductile 316L stainless steel was fabricated by hot pressing in vacuum and post-heat *** characterization on hierarchical structure of the composite before and after heat treatment was made by optical microscopy,scanning electron microscopy and electron back-scattered diffraction technique,***,the difference of mechanical performance on both sides of the interface was characterized by nano-hardness *** tensile test showed that superior interfacial bonding was achieved due to the micro-‘bite’structure between the two steels without obvious defects or oxides at the interface and with coordinated deformation of the two ***,a laminated metal composite consisting of two different constituents with extreme difference in strength can be well fabricated.

关键词： maraging steel Austenitic stainless steel Laminated metal composite Hierarchical structure interfacial

Assessment of Sea Water inundation Along Daboo Creek Area in indus Delta Region, Pakistan

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 Ocean University of China 2017年第6期16卷 1055-1060页

作者： ZiA ibrahim ZAFAR Hina shahzad muhammad i. mERAJ mohsin KAZmi Jamil H. National institute of Oceanography (NiO) Karachi 75600 Pakistan Department of Geography University of Karachi 75270 Pakistan Earth & Atmospheric Remote Sensing Laboratory (EARL) Department of Meteorology COMSATS Institute of Information Technology (CIIT) Park Road Islamabad 45550 Pakistan

indus Deltaic Region(iDR) in Pakistan is an erosion vulnerable coast due to the high deep water wave energy. Livelihood of millions of people depends on the fisheries and mangrove forests in iDR. iDR consists of many creeks where Daboo is a major creek located at southeast of the largest city of Pakistan, Karachi. Unfortunately, there has been no detailed study to analyze the damages of sea water intrusion at a large temporal and spatial scale. Therefore, this study is designed to estimate the effects of sea water inundation based on changing sea water surface salinity and sea surface temperature(SST). Sea surface salinity and SST data from two different surveys in Daboo creek during 1986 and 2010 are analyzed to estimate the damages and extent of sea water intrusion. mean salinity has increased 33.33% whereas mean SST decreased 13.79% from 1987 to 2010. Spatio-temporal analysis of creek area using LANDSAT 5 Thematic mapper(Tm) data for the years 1987 and 2010 shows significant amount of erosion at macro scale. Creek area has increased approximately 9.93%(260.86 m^2 per year) which is roughly equal to 60 extensive sized shrimp farms. Further Land Use Land Cover(LULC) analyses for years 2001 and 2014 using LANDSAT 7 Enhanced Thematic mapper Plus(ETm+) has indicated 42.3% decrease in cultivated land. Wet mud flats have spread out at the inner mouth of creek with enormous increase of 123.3%. Significant sea water intrusion has increased the area of barren land by 37.9%. This also resulted in overall decrease of 6.7% in area covered by mangroves. Therefore, this study recorded a significant evidence of sea water intrusion in iDR that has caused serious damages to community living in the area, economical losses. Additionally, it has also changed the environment by reducing creek biological productivity as reported by earlier studies over other regions of the world.

关键词： sea water intrusion SST salinity Ambro creek CTD

Pythagorean Fuzzy Einstein Aggregation Operators with Z-Numbers:Application in Complex Decision Aid Systems

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 2795-2844页

作者： shahzad Noor Abbasi Shahzaib Ashraf m.Shazib Hameed Sayed m.Eldin institute of mathematics Khwaja Fareed University of Engineering&Information TechnologyRahim Yar Khan64200Pakistan Center of Research Faculty of EngineeringFuture University in EgyptNew Cairo11835Egypt

The primary goal of this research is to determine the optimal agricultural field selection that would most effectively support manufacturing producers in manufacturing production while accounting for unpredictability and reliability in their *** PFS is known to address the levels of participation and *** begin,we introduce the novel concept of a PFZN,which is a hybrid structure of Pythagorean fuzzy sets and the *** PFZN is graded in terms of membership and non-membership,as well as reliability,which provides a strong advice in real-world decision support *** PFZN is a useful tool for dealing with uncertainty in decision-aid *** PFZN is a practical way for dealing with such uncertainties in decision-aid *** list of aggregation operators:PFZN Einstein weighted averaging and PFZN Einstein weighted geometric,is established under the novel Pythagorean fuzzy *** is a more precise mathematical instrument for dealing with precision and *** core of this research is to develop a numerical algorithmto tackle the uncertainty in real-life problems using *** show the applicability and effectiveness of the proposed algorithm,we illustrate the numerical case study related to determining the optimal agricultural *** main purpose of this work is to describe the extended EDAS approach,then compare the proposed methodology with many other methodologies now in use,and then demonstrate how the suggested methodology may be applied to real-world *** addition,the final ranking results that were obtained by the devised techniques weremore efficient and dependable in comparison to the results provided by other methods presented in the literature.

关键词： Pythagorean fuzzy Z-number Einstein weighted averaging Pythagorean fuzzy Z-number Einstein weighted geometric decision making

Hot Deformation Behavior of an Ultra-High-Strength Fe–Ni–Co-Based maraging Steel

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta metallurgica Sinica(English Letters) 2019年第9期32卷 1161-1172页

作者： Le Zhang Wei Wang m. Babar shahzad Yi-Yin Shan Ke Yang institute of metal Research Chinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Key Laboratory of Nuclear materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Hot processing behavior of an ultra-high-strength Fe–Ni–Co-based maraging steel was studied in temperature range of 900–1200℃and strain rate range of 0.001–10 s^-*** processing parameters and optimum hot working window were characterized via flow stress analysis,constitutive equation construction,hot processing map calculation and microstructure evolution,*** strain value for dynamic recrystallization was determined through theoretical mathematical differential method:the inflection point ofθ–σand-αθ/ασ-σ*** was found that the flow stress increased with the decrease in deformation temperature and increase in the strain *** power dissipation maps in the strain range of 0.1–0.6 were entirely similar with the tendency of contour lines which implied that strain had no strong effect on the dissipation ***,the instability maps showed obvious strain sensitivity with increasing strain,which was ascribed to the flow localization and *** optimized hot processing window of the experimental steel was obtained as 1100–1200℃/0.001–1 s^-1 and 1000–1100℃/0.001–0.1 s^-1,with the efficiency range of 20–40%.Owing to high mo content in the experimental steel,high dynamic activation energy,Q=439.311 kJ mol^-1,was achieved,indicating that dynamic recrystallization was difficult to occur in the hot deformation process,which was proved via microstructure analysis under different hot deformation conditions.

关键词： maraging steel Hot working Dynamic recrystallization Constitutive equation Hot processing map

Structural and dielectric properties of doped ferrite nanomaterials suitable for microwave and biomedical applications

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:materials international 2015年第5期25卷 419-424页

作者： imran Sadiq shahzad Naseem muhammad Naeem Ashiq m.A.Khan Shanawer Niaz m.U.Rana Centre of Excellence in Solid State Physics University of the Punjab institute of Chemical Sciences Bahauddin Zakariya University Department of Physics BUITEMS 4. Department of Physics University of Sargodha

The sol-gel auto-combustion method was adopted to synthesize nanomaterials of single-phase X-type hexagonal ferrites with the composition of Sr;Gd;Ni;Fe;Cd;O;（x=0.00,0.02,0.04,0.06,0.08,0.10 and y = 0,0.1,0.2,0.3,0.4,0.5）.The structural properties were carried out by XRD analysis and the lattice parameters show variation with the doping of *** average particle size measured by TEm was in the range of 8-10 nm which is beneficial in obtaining suitable signal-to-noise ratio in recording media and biomedical *** room temperature resistivity enhanced with the increase of the dopant *** increase in resistivity indicates that the synthesized materials can be considered good for the formation of the multilayer chip inductors（mLCis） as well as for the reduction of eddy current *** dielectric constant decreased with the increase in the frequency which is the general reported trend of the hexagonal ferrites and can be explained on the basis of Koop’s theory and maxwell-Wagner *** abnormal dielectric behavior indicates the formation of small polarons in the *** maximum value of tangent loss at low frequencies reflects the application of these materials in medium frequency devices（mF）.

关键词： Sol–gel Nanocrystalline materials Thermal properties Electrical properties Dielectric properties

Alginate encapsulation in Glycyrrhiza glabra *** phyto-chemical profiling of root extracts of in vitro converted plants using GC-mS analysis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2017年第10期7卷 855-861页

作者： Rakhshanda Akhtar Anwar shahzad Plant Biotechnology Section Department of BotanyAligarh Muslim UniversityAligarh 202002Uttar PradeshIndia

Objective: To investigate the conversion potential of alginate encapsulated nodes of Glycyrrhiza glabra with phyto-chemical evaluation of root extract of field transferred ***: The excised axenic nodal segments were encapsulated in alginate matrix planted on murashige and Skoog(1962) medium with different supplementation and formulations of PGRs. The two year old field transferred plants were evaluated for phytocompounds analysis using GC-mS ***: Varied responses were observed during the study, maximum conversion95.83% ± 2.40% was obtained in these encapsulates when planted on mS medium containing 2.5 m m Kinetin and 0.5 m m a-Naphthalene acetic acid, which eventually developed into complete plantlets in a single step. Further, GC-mS analysis showed the presence of different phyto-compounds in the methanolic root extracts of in vitro converted plants. The results obtained revealed the presence of about 47 phyto-compounds along with various potential bioactive compounds useful for industrial and pharmaceutical ***: This study investigates high frequency regeneration and conversion of Glycyrrhiza glabra in a single step in short time. Also, the in vitro raised plants are analysed for bioactive compounds after field transfer, which shows the presence of numerous compounds useful for commercial and pharmacological purposes.

关键词： Synseeds Conservation Licorice morphogenic Chemopreventive

Ultra-thin Laminated metal Composites with Ultra-high Strength and Excellent Soft magnetic Properties

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta metallurgica Sinica(English Letters) 2020年第3期33卷 385-390页

作者： Le Zhang Wei Wang Xiaofei Xiao m.Babar shahzad Yiyin Shan Ke Yang institute of metal Research Chinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Key Laboratory of Nuclear materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Structural metallic materials with excellent functional performance and lightweight features have always been the goal of material scientists’ *** this work,laminated metal composites of different thicknesses(less than 0.4 mm) composed of structural materials with great differences in deformation ability were successfully fabricated via a novel processing ***-high strength and excellent soft magnetic properties were combined perfectly in the ultra-thin and super-light laminated metal composite strips due to unique structural design and essential attributes of the initial *** results emphasize the significant potential application value of the ultra-thin laminated metal composites in the field of structural and functional integration.

关键词： Laminated metal composites Ultra-high strength Ultra-thin Soft magnetic property maraging steel

Radiative properties of matter based on quantum statistical method

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第7期26卷 234-243页

作者： Rukhsana Kouser G Tasneem muhammad Saleem shahzad S Sardar Amjad Ali m H Nasim m Salahuddin Department of Physics and Applied mathematics Pakistan Institute of Engineering and Applied Sciences Hefei National Laboratory for Physical Sciences at microscale and Department of modern Physics University of Science and Technology of China

We present the preliminary results of our code OPAQS（opacity calculation using quantum statistical model） that is based on the self consistent Hartree-Fock-Slater model for the average atom. The code is capable of performing robust calculations of average charge state, frequency-dependent and mean opacities. The accuracy of the atomic model is verified by comparing the calculations of average charge state with various published results. The monochromatic opacities for iron computed at different sets of temperatures and densities are compared with LEDCOP. The Rosseland and Planck opacities for iron and aluminum are validated with some state-of-the-art codes. The results are in good agreement with the published data.

关键词： self-consistent average atom model average ionization state Rosseland opacity Planck opacity

Hot deformation behavior of Cu-bearing antibacterial titanium alloy

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2018年第10期34卷 1867-1875页

作者： Zheng ma Ling Ren m.Babar shahzad Rui Liu Ying Zhao Ke Yang institute of metal Research Chinese Academy of Sciences Center for Human Tissues and Organs Degeneration Shenzhen Institute of Advanced Technology Chinese Academy of Science

We investigated the deformation behavior of a new biomedical Cu-bearing titanium alloy （Ti-645 （Ti-6.06Ai-3.75V-4.85Cu, in wt%）） to optimize its microstructure control and the hot-working process. The results showed that true stress-true strain curve ofti-645 alloy was susceptible to both deformation tem-perature and strain rate. The microstructure of Ti-645 alloy was significantly changed from equiaxed grain to acicular one with the deformation temperature while a notable decrease in grain size was recorded as well. Dynamic recovery （DRV） and dynamic recrystallization （DRX） obviously existed during the thermal compression of Ti-645 alloy. The apparent activation energies in （α ＋ β） phase and β single phase regions were calculated to be 495.21 kJ mo1^-1 and 195.69 kJ mo1^-1, respectively. The processing map showed that the alloy had a large hot-working region whereas the optimum window occurred in the strain rate range of 0.001-0.1 s-1, and temperature range of 900-960℃ and 1000-1050℃. The obtained results could provide a technological basis for the design of hot working procedure of Ti-645 alloy to optimize the material design and widen the ootential application of Ti-645 alloy in clinic.

关键词： cu-bearing titanium alloy Constitutive equation Thermal deformation microstructure Processing map

Annihilation of Antiprotons in Light Nuclei

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2006年第7期23卷 1716-1718页

作者： m. A. Rana E. U. Khan m. i. shahzad i. E. Qureshi F. malik G. Sher S. manzoor H. A. Khan Physics Research Division PINSTECH P. O. Nilore Islamabad Pakistan

CR-39 detectors have been exposed to a 5.9-meV antiproton beam using the low energy antiproton ring （LEAR） facility at CERN. At this energy, tracks of antiprotons appear in a CR-39 detector after 135 rain of etching in 6m NaOH at 70℃. Fluence of the antiproton beam has been determined using track density. We have also found tracks in the etched CR-39 detector at different depths （250-500μm）. These tracks have resulted from the annihilation of antiprotons with the constituents （H, C and O） of the CR-39 detector. The goal of the experiment is to develop a simple and low-cost method to study properties of antiparticles and those formed after annihilation of these particles with the target matter.

关键词： STOPPED ANTiPROTONS HEAVY-NUCLEi GEV/C