检索结果-南通市图书馆

Frontiers of Information Technology & Electronic Engineering 2017年第2期18卷 235-245页

作者： shafqat ullah khan Ijaz Mansoor QURESHI Fawad ZAMAN Wasim khan School of Engineering & Applied Sciences ISRA University Islamabad 44000 Pakistan Electrical Department Air University Islamabad 44000 Pakistan Electrical Department COMSAT Instimte of lnformation Technology Attock 44000 Pakistan Electronic Engineering Department International Islamic University H-10 lslamabad 44000 Pakistan

The detection of fully and partially defective sensors in a linear array composed of N sensors is addressed. First, the symmetrical structure of a linear array is proposed. Second, a hybrid technique based on the cultural algorithm with differential evolution is developed. The symmetrical structure has two advantages：（1） Instead of finding all damaged patterns, only （N-1）/2 patterns are needed; （2） We are required to scan the region from 0° to 90°instead of from 0° to 180°. Obviously, the computational complexity can be reduced. Monte Carlo simulations were carried out to validate the performance of the proposed scheme, compared with existing methods in terms of computational time and mean square error.

关键词： Cultural algorithm Differential evolution Linear symmetrical sensor array

Correction of array failure using grey wolf optimizer hybridized with an interior point algorithm

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2018年第9期19卷 1191-1202页

作者： shafqat ullah khan M.K.A.RAHIM Liaqat ALI Advanced RF ＆ Microwave Research Group Department of Communication EngineeringFaculty of Electrical EngineeringUniversiti Teknologi Malaysi Department of Electrical Engineering University of Science and Technology Bann

We design a grey wolf optimizer hybridized with an interior point algorithm to correct a faulty antenna array. If a single sensor fails, the radiation power pattern of the entire array is disturbed in terms of sidelobe level（SLL） and null depth level（NDL）, and nulls are damaged and shifted from their original locations. All these issues can be solved by designing a new fitness function to reduce the error between the preferred and expected radiation power patterns and the null limitations. The hybrid algorithm has been designed to control the array＇s faulty radiation power pattern. Antenna arrays composed of 21 sensors are used in an example simulation scenario. The MATLAB simulation results confirm the good performance of the proposed method, compared with the existing methods in terms of SLL and NDL.

关键词： Failure correction Grey wolf optimizer Interior point algorithm Sidelobes Deeper null depth level

Synthesis of silver and gold nanoparticles from leaf of Litchi chinensis and its biological activities

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2018年第3期8卷 142-149页

作者： Uzma Murad Barkatullah shafqat Ali khan Muhammad Ibrar Sami ullah Umbreen Khattak Department of Botany Faculty of Biological Sciences Islamia College Department of Botany Faculty of Biological Sciences University of Peshawar

Objective: To synthesize and isolate silver and gold nanoparticles from Litchi chinensis leaf methanolic extract, and to evaluate its comparative biological activities including muscles relaxant, analgesic, anti-inflammatory and antidiarrheal. Methods: The gold and silver nanoparticles were synthesized by dissolving methanolic extract in gold chloride and silver nitrate solution separately which were confirmed by colour change and UV-Vis spectroscopy, and pellets were collected through centrifugation. Biological activities of the extract were conducted on BALB/c mice through various standard methods and the data were subjected to One-way ANOVA. Results: The colorless gold chloride solution changed to purple soon after the addition of plant extract, demonstrating that the reaction took place and gold ions were reduced to gold nanoparticles, while colorless silver nitrate solution changed to light and dark brown that was indicative of silver nanoparticles. The muscles relaxant activity showed that silver nanoparticles were more effective than gold nanoparticles and methanolic extract in traction test. The analgesic activity showed that silver and gold nanoparticles showed highest percentage decrease in acetic acid induced writhing at the doses of 50, 100 and 150 mg/kg b.w. The highest anti-inflammatory activity was produced by gold nanoparticles followed by silver nanoparticles, while low activity was observed in methanolic leaf extract. Only the crude methanolic extract showed significant antidiarrheal activity as compared to the standard drug atropine sulphate, while antidiarrheal activities of gold and silver nanoparticles were non-significant. Conclusions: The present work concludes that isolated silver and gold nanoparticles from leaf methanolic extract shows strong muscles relaxant, analgesic and anti-inflammatory activities while crude methanolic extract possesses good antidiarrheal activity.

关键词： Litchi chinensis Methanolic extract Silver and gold nanoparticles Muscles relaxant Analgesic Anti-inflammatory Antidiarrheal activities

Selective adsorption of liquid long-chainα-olefin/paraffin on Mg-MOF-74:Adsorption behavior and interaction mechanism

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第1期16卷 1595-1605页

作者： Ruihan Yang shafqat ullah Xiao Chen Junxiang Ma Yuan Gao Yujun Wang Guangsheng Luo State Key Lab of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Lu’an Chemical Group Co. Ltd.Changzhi 046299China

The liquid products of Fischer–Tropsch synthesis with a high content of linearα-olefins can act as valuable raw materials for increasing high added-valueα-olefin production if the challenging separation of long-chainα-olefin/paraffin is *** separation is an efficient alternative to energy-intensive ***,the selective adsorption behavior and interaction mechanism of liquidα-olefin/paraffin on Mg metal–organic framework(MOF)-74 were investigated using a combination of batch adsorption experiments and molecular simulation ***-MOF-74 exhibited 301 and 333 mg/g olefin adsorption capacities for C6 and C8 linearα-olefins in binary olefin/paraffin mixtures,respectively,and was still unsaturated at high olefin *** adsorption isotherms were analyzed and compared with the simulated results by configurational-bias grand canonical Monte Carlo(CB-GCMC)*** visualized adsorption sites by CB-GCMC simulation indicated that all adsorbates were arranged in hexagonal shapes and preferentially adsorbed by the vertex of the hexagon,where the metal node magnesium is *** adsorption energies were−1.456 and−0.378 eV for C8 linearα-olefin and paraffin,respectively,calculated by density functional theory simulation based on the visualized adsorption *** charge transfer was analyzed,and the contributions of different kinds of interactions to the overall adsorption energy were quantified by principle orbital interaction analysis to further reveal the difference in adsorption energy betweenα-olefin/paraffin and *** work also provides a general means to investigate the liquid adsorption performance and host–guest interactions in the adsorption or catalytic processes of nanoporous materials.

关键词： linearα-olefin metal-organic frameworks liquid-phase adsorption molecular simulations principle orbital interaction

Correlation of adsorbent cavity structure with adsorption behavior and interaction of long-chainα-olefin/paraffin on microporous adsorbents

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第4期16卷 5721-5732页

作者： Ruihan Yang Fangyu Zhao shafqat ullah Xiao Chen Junxiang Ma Yuan Gao Yujun Wang Guangsheng Luo State Key Lab of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Lu’an Chemical Group CO. LTD.Changzhi 046299China

Long-chainα-olefins have a high added value as important raw materials for many highly marketable ***-Tropsch synthesis products contain ultrahigh-contentα-olefins,which are of great value if the challenging separation ofα-olefin/paraffin is achieved through energy-saving ways,for which adsorption separation is an attractive *** of the most significant differences between the adsorption separation of long-chain and light hydrocarbons is the steric hindrance of the molecular ***,we propose a combination of window size,metal node spacing,and bending degree to quantitatively describe the adsorption cavity structure for the separation of long-chainα-olefin/*** general cavity structural characteristics of microporous materials with good separation performance for long-chainα-olefin/paraffin are *** selective adsorption of liquid C6 and C_(8)α-olefin/paraffin mixtures on CuBTC(BTC=benzene-1,3,5-tricarboxylate)was studied in detail to reveal the influence of the cavity structure on the adsorption and interaction using a combination of batch adsorption experiments and molecular simulation *** exhibited 360 and 366 mg/g olefin adsorption capacities for C6 and C8 linearα-olefins,*** adsorption energies were−0.540 and−0.338 eV for C8 linearα-olefin and paraffin,*** contributions of different types of interactions to the overall adsorption energy were quantified to illustrate the adsorption energy difference betweenα-olefin/paraffin and *** work provides a new understanding of the long-chain hydrocarbon adsorption behavior different from ethylene/ethane and propylene/propane,which guides the design of adsorbents forα-olefin/paraffin separation.

关键词： linearα-olefin adsorption cavity structure metal-organic framework liquid-phase adsorption molecular simulations principal orbital interaction

Multi-phase flow effect on SRM nozzle flow field and thermal protection materials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

航空动力学报 2009年第10期24卷 2372-2378页

作者： shafqat Wahab School of Astronautics Beijing University of Aeronautics and Astronautics

Multi-phase flow effect generated from the combustion of aluminum based composite propellant was performed on the thermal protection material of solid rocket motor(SRM) *** of alumina(Al2O3) particles from 5% to 10% was tried on SRM nozzle flow field to see the influence of multiphase flow on heat transfer computations.A coupled,time resolved CFD(computational fluid dynamics) approach was adopted to solve the conjugate problem of multi-phase fluid flow and heat transfer in the solid rocket motor *** governing equations are discretized by using the finite volume ***-Allmaras(S-A) turbulence model was *** computation was executed on the different models selected for the analysis to validate the temperature variation in the throat inserts and baking material of SRM *** for temperatures variations were also carried out at different expansion ratios of *** paper also characterized the advanced SRM nozzle composites material for their high thermo stability and their high thermo mechanical capabilities to make it more reliable simpler and lighter.

关键词： solid rocket motor nozzle multiphase flow thermal protection material temperature distribution finite volume method

Numerical simulation of multi-phase combustion flow in solid rocket motors with metalized propellant

在线全文

学校读者我要写书评

暂无评论

航空动力学报 2009年第7期24卷 1654-1660页

作者： shafqat Wahab School of Astronautics Beijing University of Aeronautics and Astronautics

Multi-phase flowfield simulation has been performed on solid rocket motor and effect of multi-phases on the performance prediction of the solid rocket motor(SRM) is *** the combustion of aluminized propellant,the aluminum particles in the propellant melt and formliquid aluminum at the burning propellant *** the flow within the rocket motor is multi phase or two phase because it contains droplets and smoke particles of *** mulations have been performed on a large scale motor,to observe the effect of the flowfield onthe chamber and nozzle as *** particles diameters and Rosin-Rammler diameter distribution method that is based on the assumption that an exponential relationship exists betweenthe droplet diameter,dand mass fraction of droplets with diameter greater thandhave been used for the si mulation of different distribution of Al2O3 droplets present in *** sizes in the range of 1-100μm are used,as being the most common *** this approachthe complete range of particle sizes is dividedinto a set of discrete size ranges,eachto be defined by single streamthat is part of the *** scheme-flux differencing splitting based on approxi mate Riemann problem has been used to si mulate the effects of the multi-phase *** is second order upwind scheme in which flux differencing splitting method is *** cater for the turbulence effect,Spalart-All maras model has been *** results obtained show the great sensitivity of this diameters distribution and particles concentrations to the SRMflowdynamics,primarily at the motor chamber and nozzle *** results are shown with various sizes of the particles concentrations and geometrical configurations including models for SRM and *** analysis also provides effect of multi-phase on performance prediction of solid rocket motor.

关键词： solid rocket motor nozzle multiphase flow Rosin-Rammler diameter distribution method Roe FDS (flux differencing splitting) performance prediction

Generating Synthetic Data to Reduce Prediction Error of Energy Consumption

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第2期70卷 3151-3167页

作者： Debapriya Hazra Wafa shafqat Yung-Cheol Byun Department of Computer Engineering Jeju National UniversityJeju-siKorea

Renewable and nonrenewable energy sources are widely incorporated for solar and wind energy that produces electricity without increasing carbon dioxide *** industries worldwide are trying hard to predict future energy consumption that could eliminate over or under contracting energy resources and unnecessary *** learning techniques for predicting energy are the trending solution to overcome the challenges faced by energy *** basic need for machine learning algorithms to be trained for accurate prediction requires a considerable amount of *** critical factor is balancing the data for enhanced *** Augmentation is a technique used for increasing the data available for *** data are the generation of new data which can be trained to improve the accuracy of prediction *** this paper,we propose a model that takes time series energy consumption data as input,pre-processes the data,and then uses multiple augmentation techniques and generative adversarial networks to generate synthetic data which when combined with the original data,reduces energy consumption prediction *** propose TGAN-skip-Improved-WGAN-GP to generate synthetic energy consumption time series tabular *** modify TGANwith skip connections,then improveWGANGPby defining a consistency term,and finally use the architecture of improved WGAN-GP for training *** used various evaluation metrics and visual representation to compare the performance of our proposed *** also measured prediction accuracy along with mean and maximum error generated while predicting with different variations of augmented and synthetic data with original *** mode collapse problemcould be handled by TGAN-skip-Improved-WGAN-GP model and it also converged faster than existing GAN models for synthetic data *** experiment result shows that our proposed technique of combining synthetic data with original data could significantly red

关键词： Energy consumption generative adversarial networks synthetic data time series data TGAN WGAN-GP TGAN-skip prediction error augmentation

The New Neutrosophic Double and Triple Exponentially Weighted Moving Average Control Charts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2021年第10期129卷 373-391页

作者： Ambreen shafqat Muhammad Aslam Muhammad Saleem Zameer Abbas Department of Statistics and Financial Mathematics School of ScienceNanjing University of Science and TechnologyNanjing210094China Department of Statistics University of SargodhaSargodha40100Pakistan Department of Statistics Faculty of ScienceKing Abdulaziz UniversityJeddah21551Saudi Arabia Department of Industrial Engineering Faculty of Engineering-RabighKing Abdulaziz UniversityJeddah21589Saudi Arabia Goverment Ambala Muslim Graduate College Sargodha40100Pakistan

The concept of neutrosophic statistics is applied to propose two monitoring schemes which are an improvement of the neutrosophic exponentially weighted moving average(NEWMA)*** this study,two control charts are designed under the uncertain environment or neutrosophic statistical interval system,when all observations are undermined,imprecise or *** are termed neutrosophic double and triple exponentially weighted moving average(NDEWMA and NTEWMA)control *** the proficiency of the proposed chart,Monte Carlo simulations are used to calculate the run-length characteristics(such as average run length(ARL),standard deviation of the run length(SDRL),percentiles(P_(25),P_(50),P_(75)))of the proposed *** structures of the proposed control charts are more effective in detecting small shifts while these are comparable with the other existing charts in detecting moderate and large *** simulation study and real-life implementations of the proposed charts show that the proposed NDEWMA and NTEWMA charts perform better in monitoring the process of road traffic crashes and electric engineering data as compared to the existing control ***,the proposed charts will be helpful in minimizing the road accident and minimizing the defective ***,the proposed charts are more acceptable and actual to apply in uncertain environment.

关键词： Exponentially weighted moving average(EWMA) double EWMA triple EWMA neutrosophic control chart run-length

Cell-type specificity of β-actin expression and its clinicopathological correlation in gastric adenocarcinoma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第34期20卷 12202-12211页

作者： shafqat A khan Monica Tyagi Ajit K Sharma Savio G Barreto Bhawna Sirohi Mukta Ramadwar Shailesh V Shrikhande Sanjay Gupta Epigenetics and Chromatin Biology Group Cancer Research InstituteAdvanced Centre for Treatment Research and Education in CancerTata Memorial CentreKhargharNavi MumbaiMH 410210India Gastrointestinal and Hepato-Pancreato-Biliary Service Department of Surgical OncologyTata Memorial HospitalTata Memorial CentreMumbaiMH 400012India Medanta Institute of Hepatobiliary and Digestive Sciences MedantaThe MedicityGurgaonHaryana 122001India Medical Oncology-GI and Breast Unit Tata Memorial HospitalTata Memorial CentreMumbaiMH 400012India Department of Pathology Tata Memorial HospitalTata Memorial CentreMumbaiMH 400012India

AIM: To investigate cell type specific distribution of β-actin expression in gastric adenocarcinoma and its correlation with clinicopathological parameters.

关键词： Gastric cancer β-actin Immunohistochemistry Epithelial cells Inflammatory cells Tumor infiltrating immune cells Adjacent mucosa Resection margin