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| 1 | Structural and optical properties of thermally reduced graphene oxide for energy devices显示文摘Natural intercalation of the graphite oxide, obtained as a product of Hummer's method, via ultra-sonication of water dispersed graphite oxide has been carried out to obtain graphene oxide(GO) and thermally reduced graphene oxide(RGO).Here we report the effect of metallic nitrate on the oxidation properties of graphite and then formation of metallic oxide(MO) composites with GO and RGO for the first time. We observed a change in the efficiency of the oxidation process as we replaced the conventionally used sodium nitrate with that of nickel nitrate Ni(NO_3)_2, cadmium nitrate Cd(NO_3)_2,and zinc nitrate Zn(NO_3)_2. The structural properties were investigated by x-ray diffraction and observed the successful formation of composite of MO–GO and MO–RGO(M = Zn, Cd, Ni). We sought to study the effect on the oxidation process through optical characterization via UV-Vis spectroscopy and Fourier Transform Infrared(FTIR) spectroscopy.Moreover, Thermo Gravimetric Analysis(TGA) was carried out to confirm > 90% weight loss in each process thus proving the reliability of the oxidation cycles. We have found that the nature of the oxidation process of graphite powder and its optical and electrochemical characteristics can be tuned by replacing the sodium nitrate(NaNO_3) by other metallic nitrates as Cd(NO_3)_2, Ni(NO_3)_2, and Zn(NO_3)_2. On the basis of obtained results, the synthesized GO and RGO may be expected as a promising material in antibacterial activity and in electrodes fabrication for energy devices such as solar cell, fuel cell,and super capacitors. | Ayesha Jamil Faiza Mustafa Samia Aslam Usman Arshad Muhammad Ashfaq Ahmad | 2017 | Chinese Physics B2017，26，8： | 3 |
| 2 | Excitation of defect modes from the extended photonic band-gap structures of 1D photonic lattices显示文摘This paper stuides numerically the model equation in a one dimensional defective photonic lattice by modifying the potential function to a periodic function. It is found that defect modes (DMs) can be regarded as Bloch modes which are excited from the extended photonic band-gap structure at Bloch wave-numbers with k x = 0. The DMs for both positive and negative defects are considered in this method. | 周可雅 郭忠义 Muhammad Ashfaq Ahmad 刘树田 | 2010 | Chinese Physics B2010，19，1： | 2 |
| 3 | 一类q变形广义相干叠加态的量子统计性质显示文摘研究了一类q变形广义相干态叠加态ψ〉=aβ〉+beiφβeiδ〉的量子统计性质,结果表明此种叠加态普遍存在压缩效应和光子反群聚效应。相干态间的位相差,叠加系数的位相差和广义相干态之间内积的幅值和位相的变化对迭加态的压缩效应和反群聚效应起着重要的作用。 | 任珉 马爱群 Muhammad Ashfaq Ahmad 曾然 刘树田 马志民 | 2007 | 物理学报2007，56，2： | 1 |
| 4 | Amplitude-squared squeezing of superposition of coherent states显示文摘This paper discusses the amplitude-squared squeezing for the superposition of two coherent states with their phase differences being separately π/2, 3π/2, and π, as well as for the superposition state of two pseudoclassical states. According to the analysis, it is found that the superposition state of two coherent states with their phase differences π/2 and 3π/2, and the superposition state of two pseudoclassical states both do exhibit the amplitude-squared squeezing. Also, some specific states are found to exhibit even stronger squeezing effects when relative phase of the superposition is equal to the average photon number. Amplitude-squared squeezing is dependent on the difference in phase between two coherent states. | Muhammad Ashfaq Ahmad 任珉 马爱群 刘树田 | 2008 | Chinese Physics B2008，17，5： | 1 |
| 5 | Linear Entropy and Entanglement in Two-Charge-Qubit Circuits显示文摘我们考虑包含二的一个模型由分享一个大 Josephson 连接联合了超导的费用 qubits。我们检验二 qubits 的线性熵和处于一个激动的状态的两 qubits 的概率的动态性质。结果证明起始的吝啬的光子数字,这块地的起始的阶段和二 qubit 的层次的相对阶段在二 qubits 和概率的线性熵的进化起一个重要作用。[从作者抽象] | 廖庆洪 方光宇 王月媛 AHMAD Muhammad Ashfaq 刘树田 | 2010 | Chinese Physics Letters2010，27，7： | 1 |
| 6 | Influence of absorber doping in a-SiC:H/a-Si:H/a-SiGe:H solar cells显示文摘This work deals with the design evaluation and influence of absorber doping for a-Si:H/a-SiC:H/a-SiGe: H based thin-film solar cells using a two-dimensional computer aided design(TCAD) tool.Various physical parameters of the layered structure,such as doping and thickness of the absorber layer,have been studied.For reliable device simulation with realistic predictability,the device performance is evaluated by implementing necessary models(e.g.,surface recombinations,thermionic field emission tunneling model for carrier transport at the heterojunction,Schokley-Read Hall recombination model,Auger recombination model,bandgap narrowing effects, doping and temperature dependent mobility model and using Fermi-Dirac statistics).A single absorber with a graded design gives an efficiency of 10.1%for 800 nm thick multiband absorption.Similarly,a tandem design shows an efficiency of 10.4%with a total absorber of thickness of 800 nm at a bandgap of 1.75 eV and 1.0 eV for the top a-Si and bottom a-SiGe component cells.A moderate n-doping in the absorber helps to improve the efficiency while p doping in the absorber degrades efficiency due to a decrease in the VOC(and fill factor) of the device. | Muhammad Nawaz Ashfaq Ahmad | 2012 | Journal of Semiconductors2012，33，4： | 0 |
| 7 | Nonclassical Properties of Superposition of Two Coherent States Shifted in Phase by 3π/2显示文摘 | AHMAD Muhammad Ashfaq 曾然 刘树田 | 2006 | Chinese Physics Letters2006，23，9： | 0 |
| 8 | Properties of Linear Entropy in k-Photon Jaynes-Cummings Model with Stark Shift and Kerr-Like Medium显示文摘The time evolution of the linear entropy of an atom in k-photon Jaynes-Cummings model is investigatedtaking into consideration Stark shift and Kerr-like medium. The effect of both the Stark shift and Kerr-like medium onthe linear entropy is analyzed using a numerical technique for the field initially in coherent state and in even coherentstate. The results show that the presence of the Kerr-like medium and Stark shift has an important effect on theproperties of the entropy and entanglement. It is also shown that the setting of the initial state plays a significant rolein the evolution of the linear entropy and entanglement. | 廖庆洪 Muhammad Ashfaq Ahmad 王月媛 刘树田 | 2010 | Communications in Theoretical Physics2010，，5： | 0 |
| 9 | 5G Antenna Gain Enhancement Using a Novel Metasurface显示文摘This article presents a Sub-6 GHz microstrip patch antenna(MPA)with enhanced gain using metamaterial(MTM)superstrate.The source MPA operates at 4.8 GHz and has a peak gain of 5.3 dBi at the resonance frequency.A window-shaped unit cell is designed and investigated through the material wave propagation technique.The unit cell shows an EpsilonNear Zero(ENZ)-Mu Very Large(MVL)behavior around 4.8 GHz.The unit cell has a fourfold geometry which makes it a polarization independent metamaterial.A double layer antenna is designed by placing a 4×4 MTM slab as a superstrate above the MPA at a height of 0.208λ0;whereλ0 is the free-space wavelength at the resonance frequency of the antenna.Impedance matching and gain of the source antenna is improved using the metamaterial.The simulation as well as measurement results show that novel antenna system has a peak gain of 7.68 dBi at 4.8 GHz and an impedance bandwidth of 0.22 GHz.The overall dimension of the antenna is 75×60×15 mm^(3).The proposed antenna operates in the Sub-6 GHz band and is suitable for 5G applications. | Mubashir Ashfaq Shahid Bashir Syed Imran Hussain Shah Nisar Ahmad Abbasi Hatem Rmili Muhammad Abbas Khan | 2022 | Computers, Materials & Continua2022，，8： | 0 |
| 10 | 社会政治地理和生态压力对传统牧业制度的影响综述(英文)显示文摘Pastoralism is a viable socio-economic system-shaped by landless and agro-pastoral communities in many pastoral regions of the world. This system is mainly based on seasonal migration of pastoralists and their livestock herds between upland and lowland pastures. Traditionally pastoral activities make significant contributions to mountain livelihood subsistence, regional economies and environmental sustainability. However, the pastoralist’s lifestyle and their economies are increasingly confronted to various socio-political, economic and ecological stresses from the last few decades. Extensive literature reviewed on this subject with the aim to explore the current emerging challenges faced by pastoral communities in different pastoral regions. It has been revealed from literature that the prevalent socio-political and economic stress on pastoralism caused by modernization, insecure land tenure, integration of market economy, civil insecurities and pastoralist’s exclusion in states policies while ecological stress on pastoral activities emerged with increasing focus on nature conservation in pastoral regions and climate change induced hazards and disasters. As a consequence of these challenges, pastoral households are abandoning livestock herding–as a traditional way of life and are in continuous transition to transform their pastoral practices and institutions. Thus, the attention and consultation of key stakeholders are needed toward pastoral resource development that improve and sustain traditional pastoral practices in a socio-politically and ecologically stressed environment of the world. | MUHAMMAD Khurshid MOHAMMAD Nafees ABDULLAH Khan MEHMET Somuncu ASHFAQ Ahmad Khan WAJID Rashid | 2019 | Journal of Geographical Sciences2019，29，10： | 0 |
| 11 | 两超导电荷量子比特与压缩相干态相互作用的纠缠特性显示文摘通过计算线性熵研究了两超导电荷量子比特与压缩相干态相互作用系统的纠缠动力学特性,讨论了两超导量子比特相对位相和压缩参数对线性熵的影响。结果表明:两超导量子比特初时处于最大纠缠态时,线性熵的值在复苏时间的一半时刻几乎趋近于零。随着压缩参数的增大,线性熵随时间的演化呈现更多的振荡行为,并且延长了线性熵最大值的持续时间,而线性熵的最大值基本保持不变。两超导量子比特的相对位相减小了两比特和场的纠缠。 | 廖庆洪 刘晔 Muhammad Ashfaq Ahmad | 2013 | 南昌大学学报(工科版)2013，35，4： | 0 |
| 12 | Entangled States Based on Two Coherent States 3π/2 out of Phase显示文摘 | AHMAD Muhammad Ashfaq 刘树田 | 2006 | Chinese Physics Letters2006，23，11： | 0 |
| 13 | Control of the Entanglement between Two Josephson Charge Qubits显示文摘We consider a model which consists of two coupled superconducting charge qubits by sharing a large Josephson junction.The time evolution of entanglement between two Josephson charge qubits is investigated by employing the concurrence.We examine the influence of the initial mean photon number,the relative phase and the amplitude of the two qubits on the time evolution of entanglement.The results show that the initial mean photon number,the relative phase and the amplitude of the two qubits play an important role in the evolution of entanglement. | 廖庆洪 方光宇 王继成 AHMAD Muhammad Ashfaq 刘树田 | 2011 | Chinese Physics Letters2011，28，6： | 0 |
| 14 | 运动原子和不同初始场相互作用系统中熵和纠缠的研究(英文)显示文摘通过计算线性熵研究了当场初始处于薛定谔猫态和压缩相干态时Jaynes-Cummings模型中原子线性熵随时间的演化特性,讨论了原子运动和场模结构参数对原子线性熵的影响.结果发现原子和场之间的纠缠对压缩参数非常敏感,并且结果表明当腔场初始处于Yurke-Stoler态时,原子的运动导致了线性熵的周期性演化,随着场模结构参数的增加,不但线性熵的演化周期缩短,而且线性熵的的幅值减小.当腔场初始处于偶相干态时,场模结构参数的增加导致了线性熵的演化周期缩短,然而对线性熵的幅值没有影响. | 廖庆洪 鄢秋荣 刘晔 Muhammad Ashfaq Ahmad | 2013 | 光子学报2013，42，10： | 0 |
| 15 | Amplitude-squared squeezing of the generalized odd-even coherent states of the anharmonic oscillator in a finite-dimensional Hilbert space显示文摘 | Muhammad Ashfaq Ahmad 林杰 钱妍 马志民 马爱群 刘树田 | 2007 | Chinese Physics B2007，16，5： | 0 |
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