检索结果-南通市图书馆

Dynamics of volatility spillover between stock market and foreign exchange market: evidence from Asian Countries

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Financial Innovation 2016年第1期2卷 29-48页

作者： Khalil Jebran amjad iqbal Department of Management Studies University of MalakandChakdaraPakistan Dongbei University of Finance and Economics DalianChina

Background:The purpose of this study is to examine volatility spillover effects between stock market and foreign exchange market in selected Asian countries;Pakistan,India,Sri Lanka,China,Hong Kong and *** study considered daily data from 4th January,1999 to 1st January,***:This study opted EGARCH(Exponential Generalized Auto Regressive Conditional Heteroskedasticity)model for the purpose of analyzing asymmetric volatility spillover effects between stock and foreign exchange ***:The EGARCH analyses reveal bidirectional asymmetric volatility spillover between stock market and foreign exchange market of Pakistan,China,Hong Kong and Sri *** results reveal unidirectional transmission of volatility from stock market to foreign exchange market of *** analysis reveals no evidence of volatility transmission between the two markets in reference to ***:The result of this study provide valuable insights to economic policy makers for financial stability perspective and to investors regarding decision making in international portfolio and currency risk strategies.

关键词： Volatility spillover Asian Countries EGARCH Exchange rate Stock market

Design of a Five-Band Dual-Port Rectenna for RF Energy Harvesting

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 2021年第10期69卷 487-501页

作者： Surajo Muhammad Jun Jiat Tiang Sew Kin Wong Jamel Nebhen amjad iqbal Centre for Wireless Technology Faculty of EngineeringMultimedia UniversityCyberjaya63100Malaysia College of Computer Science and Engineering Prince Sattam Bin Abdulaziz UniversityAlkharj11942Saudi Arabia

This paper proposed the design of a dual-port rectifier with multifrequency *** RF rectifier is achieved using a combination of L-section inductive impedance matching network(IMN)at Port-1 with a multiple stubs impedance transformer at *** fabricated prototype can harvest RF signal from GSM/900,GSM/1800,UMTS/2100,Wi-Fi/2.45 and LTE/2600 frequency bands at(0.94,1.80,2.10,2.46,and 2.63 GHz),*** rectifier occupies a small portion of a PCB board at 0.20λg×0.15λ*** proposed circuit realized a measured peak RF-to-dc(radio frequency direct current)power conversion efficiency(PCE)of(21%,22.76%,25.33%,21.57%,and 22.14%)for an input power of−20 *** RF harvester attains a measured peak RF-to-dc PCE of 72.70%and an output dc voltage of 154 mV for an input power of 3 dBm at 2.46 *** of the proposed rectifier in the ambiance gives a peak dc output voltage of 376.1 mV from the five signal ***,a low-powered bq25504-674 evaluation module(EVM)is integrated with the *** module boost and drive the rectifier output dc voltage to 945 *** performance of the proposed rectifier in the ambiance environment makes it a suitable module for low-powered RF applications.

关键词： RF energy harvesting impedance matching network power conversion efficiency multi-band rectifier

Lung Cancer Detection Using Modified AlexNet Architecture and Support Vector Machine

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 2023年第1期74卷 2039-2054页

作者： Iftikhar Naseer Tehreem Masood Sheeraz Akram Arfan Jaffar Muhammad Rashid Muhammad amjad iqbal Faculty of Computer Science and Information Technology The Superior UniversityLahore54000Pakistan Department of Computer Science National University of TechnologyIslamabad45000Pakistan Faculty of IT University of Central PunjabLahore54100Pakistan

Lung cancer is the most dangerous and death-causing disease indicated by the presence of pulmonary nodules in the *** is mostly caused by the instinctive growth of cells in the *** nodule detection has a significant role in detecting and screening lung cancer in Computed tomography(CT)scan *** detection plays an important role in the survival rate and treatment of lung cancer ***,pulmonary nodule classification techniques based on the convolutional neural network can be used for the accurate and efficient detection of lung *** work proposed an automatic nodule detection method in CT images based on modified AlexNet architecture and Support vector machine(SVM)algorithm namely *** proposed model consists of seven convolutional layers,three pooling layers,and two fully connected layers used to extract *** vector machine classifier is applied for the binary classification of nodules into benign *** experimental analysis is performed by using the publicly available benchmark dataset Lung nodule analysis 2016(LUNA16).The proposed model has achieved 97.64%of accuracy,96.37%of sensitivity,and 99.08%of specificity.A comparative analysis has been carried out between the proposed LungNet-SVM model and existing stateof-the-art approaches for the classification of lung *** experimental results indicate that the proposed LungNet-SVM model achieved remarkable performance on a LUNA16 dataset in terms of accuracy.

关键词： Lung cancer alexnet luna16 computed tomography support vector machine

A Compact Dual-Port Multi-Band Rectifier Circuit for RF Energy Harvesting

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 2021年第7期68卷 167-184页

作者： Surajo Muhammad Jun Jiat Tiang Sew Kin Wong amjad iqbal Amor Smida Mohamed Karim Azizi Centre for Wireless Technology Faculty of EngineeringMultimedia UniversityCyberjaya63100Malaysia Department of Medical Equipment Technology College of Applied Medical SciencesMajmaah UniversityAlMajmaah11952Saudi Arabia Department of Physics Microwave Electronics Research LaboratoryFaculty of MathematicalPhysical and Natural Sciences of TunisTunis El Manar UniversityTunis2092Tunisia

This paper presents a compact multi-band rectifier with an improved impedance matching *** uses a combination of–matching network(MN)at Port-1,with a parallel connection of three cell branch MN at *** proposed impedance matching network(IMN)is adopted to reduce circuit complexity,to improve circuit performance,and power conversion efficiency(PCE)of the rectifier at low input *** fabricated rectifier prototype operates at 0.92,1.82,2.1,2.46 and 2.65 GHz covering GSM/900,GSM/1800,UMTS2100,and Wi-Fi/2.45–*** size of the compact rectifier on the PCB board is 0.13λ_(g)×0.1λ_(g).The fabricated rectifier achieved an RF-to DC(radio frequency direct current)PCE of 31.8%,24%,22.7%,and 15%,and 14.1%for−20 dBm at the five respective measured operating *** circuit attains a peak RF-to-DC PCE of 82.3%for an input power of 3 dBm at 0.92 *** proposed rectifier realizes an ambient output dc voltage of 454 mV for multi-tone input signals from the two *** rectifier drives a bq25504-674 power management module(PMM)to achieve 1.21 V from the two-port *** rectifier has the ability to exploit both frequency domain through the multi-band operation with good impedance bandwidth and a spatial domain using dual-port ***,it is a potential candidate for various applications in radio frequency energy harvesting(RFEH)system.

关键词： RF energy harvesting impedance matching network power conversion efficiency multi-band rectifier dual-port power management module

V-Shaped Monopole Antenna with Chichena Itzia Inspired Defected Ground Structure for UWB Applications

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 2020年第10期65卷 19-32页

作者： Naeem Ahmad Jan Saad Hassan Kiani Fazal Muhammad Daniyal Ali Sehrai amjad iqbal Muhammad Tufail Sunghwan Kim Department of Electrical Engineering Iqra National UniversityPeshawar25000Pakistan Department of Electrical Engineering City University of Science and Information TechnologyPeshawar25000Pakistan Department of Electrical Engineering Multimedia UniversityCyberjaya63100Malaysia Department of Mechatronics Engineering University of Engineering and TechnologyPeshawar25000Pakistan Department of Electrical Engineering University of UlsanUlsan44610Korea

Due to rapid growth in wireless communication technology,higher bandwidth requirement for advance telecommunication systems,capable of operating on two or higher bands with higher channel capacities and minimum distortion losses is *** this paper,a compact Ultra-Wideband(UWB)V-shaped monopole antenna is *** response is achieved by modifying the ground plane with Chichen Itzia inspired rectangular staircase *** proposed V-shaped is designed by incorporating a rectangle,and an inverted isosceles triangle using FR4 *** size of the antenna is 25 mm×26 mm×1.6 *** proposed V-shaped monopole antenna produces bandwidth response of 3 GHz Industrial,Scientific,and Medical(ISM),Worldwide Interoperability for Microwave Access(WiMAX),(IEEE 802.11/HIPERLAN band,5G sub 6 GHz)which with an additional square cut amplified the bandwidth response up to 8 GHz ranging from 3.1 GHz to 10.6 GHz attaining UWB defined by Federal Communications Commission(FCC)with a maximum gain of 3.83 *** antenna is designed in Ansys *** for key performance parameters of the antenna are *** measured results are in good agreement with the simulated *** to flat gain,uniform group delay,omni directional radiation pattern characteristics and well-matched impedance,the proposed antenna is suitable for WiMAX,ISM and heterogeneous wireless systems.

关键词： V-shape monopole gain staircase ultra-wideband omni-directional defected ground structure

Design of a Compact Monopole Antenna for UWB Applications

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 2021年第1期66卷 35-44页

作者： Naeem Ahmad Jan Saad Hassan Kiani Daniyal Ali Sehrai Muhammad Rizwan Anjum amjad iqbal Mujeeb Abdullah Sunghwan Kim Department of Electrical Engineering Iqra National UniversityPeshawar25000Pakistan Department of Electrical Engineering City University of Science and Information TechnologyPeshawar25000Pakistan Department of Electronic Engineering The Islamia University of BahawalpurBahawalpur63100Pakistan Department of Electrical Engineering Multimedia UniversityCyberjaya63100Malaysia Department of Computer Science Bacha Khan UniversityCharsadda24420Pakistan School of Electrical Engineering University of UlsanUlsan44610Korea

In this paper,a low cost,highly efficient and low profile monopole antenna for ultra-wideband(UWB)applications is presented.A new inverted triangular-shape structure possessing meander lines is designed to achieve a wideband response and high *** design the proposed structure,three steps are utilized to achieve an UWB *** bandwidth of the proposed antenna is improved with changing meander lines parameters,miniaturization of the ground width and optimization of the feeding *** measured and simulated frequency band ranges from 3.2 to 12 GHz,while the radiation patterns are measured at 4,5.3,6 and 8 GHz frequency *** overall volume of the proposed antenna is 26×25×1.6 mm^(3);whereas the FR4 material is used as a substrate with a relative permittivity and loss tangent of 4.3 and 0.025,*** peak gain of 4 dB is achieved with a radiation efficiency of 80 to 98%for the entire *** modelling of proposed antenna is performed in ANSYS HFSS 13 software.A decent consistency between the simulated and measured results is accomplished which shows that the proposed antenna is a potential candidate for the UWB applications.

关键词： Ultra-wideband(UWB) meander lines monopole antenna high efficiency high gain ANSYS HFSS

Determinants of corporate cash holdings in tranquil and turbulent period:evidence from an emerging economy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Financial Innovation 2019年第1期5卷 42-53页

作者： Khalil Jebran amjad iqbal Kalim Ullah Bhat Muhammad Arif Khan Mustansar Hayat School of Accounting Dongbei University of Finance and EconomicsDalianChina School of Management Fudan UniversityShanghaiChina Faculty of Management and Economics Dalian University of TechnologyDalianChina

Using a sample of 280 firms listed on the Pakistan Stock Exchange,we empirically investigate factors that determine corporate cash holdings in different periods from 2005 to *** divide the sample into three sub-periods—pre-crisis,crisis,and post-crisis—and apply a panel data model to estimate the *** results suggest that financial crises affect firms’cash holdings ***,findings show that financial crisis has influenced the relationship of size and leverage with cash *** particular,cash flow,liquidity,and tangibility are major determinants of cash holdings in the *** present important implications for corporate managers,academicians,and policymakers.

关键词： Cash holdings Financial crisis Pakistan Emerging economy

Examining volatility spillover between Asian stock markets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Finance and Economic Review 2016年第2期5卷 23-36页

作者： Khalil Jebran amjad iqbal Department of Management Studies University of MalakandPakistan School of Accounting Dongbei University of Finance and EconomicsChina

This study examined the volatility spillover effects between Asian stock markets,i.e.,Pakistan,India,Sri Lanka,China Mainland,Japan and China Hong *** daily data was considered from the period 4^(th) January,1999 to 1^(st) January,2014,consisting 5 trading days from Monday to *** volatility spillover between stock markets was captured by using GARCH(generalized auto regressive conditional heteroskedasticity)*** empirical analyses show evidence of significant bidirectional spillover of return and volatility between China Mainland and *** results also show significant bidirectional volatility transmission between the following equity markets;China Hong Kong and Sri Lanka,China Mainland and Sri *** significant unidirectional transmissions of stock market volatility are found to be flowing from;India to China Mainland,Sri Lanka to Japan,Pakistan to Sri Lanka,China Hong Kong to India and *** results are important for economic policy makers in order to safeguard the financial sector from international financial *** investors can use this information for making efficient portfolio which will reduce their risk and enhance their returns.

关键词： volatility spillover Asian stock markets GARCH model time series analyses

Antimicrobial and plant growth-promoting activities of bacterial endophytes isolated from Calotropis procera(Ait.)***

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

BIOCELL 2021年第2期45卷 363-369页

作者： MUHAMMAD HAMAYUN NASIR KHAN MUHAMMAD NAUMAN KHAN MUHAMMAD QADIR ANWAR HUSSAIN amjad iqbal SUMERA AFZAL KHAN KHUSHNOOD UR REHMAN IN-JUNG LEE Plant-Microbe Interactions Lab Department of BotanyAbdul Wali Khan University MardanKPPakistan Department of Botany Bacha Khan University CharsaddaCharsadda24420Pakistan Department of Food Science and Technology Abdul Wali Khan University MardanMardan23200Pakistan Centre of Biotechnology and Microbiology University of PeshawarPeshawar25000Pakistan Department of Botany Islamia College UniversityPeshawar25000Pakistan Department of Applied Biosciences Kyungpook National UniversityDaegu41566Korea

Bacterial endophytes are beneficial to their hosts as they can fix nitrogen in the soil and make it available to the *** bacteria also secrete plant growth-promoting hormones to support their host plants under normal as well as stress *** current study aimed to isolate endophytic bacteria from different parts of Calotropis procera,i.e.,roots,stem and leaves of Calotropis procera(Ait.)*** were collected from the Lundkhwar,district Mardan.A total of 12 bacterial strains,i.e.,six from roots,three from the stem and three from the leaves were *** strains were screened for their growth-promoting activity in rice plants because rice shows a quick and easy response to the bioactive compounds present in the culture filtrate(CF)of the potent endophytic *** rice plants were cultivated in pots containing 30 mL of 0.8%w/v water-agar *** pots were placed in a growth chamber,operated at 28±0.3℃ for 14 h(day);and 25±0.3℃ for 10 h(night),at 70%*** the isolated strains,R1,S1,S3,L1,R5 and R6 showed visible growth promotion in rice *** biochemical analysis revealed that the strains were able to produce indole acetic acid(IAA)and flavonoids in higher ***,the strains also produced bioactive compounds that inhibited the growth of Escherichia coli and Aspergillus flavus using the well diffusion *** the results,it was concluded that these strains can secrete potent compounds that can promote the host plant growth and inhibit the growth of pathogenic microorganisms and,therefore,can be used as bio-fertilizer and bio-control agents.

关键词： Endophytic bacteria Growth promotion Antimicrobial activity Plant-microbe interaction