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Frequency and vibration responses of a magneto-rheological sandwich micro-beam based on modified couple stress theory and finite difference method 认领 引用
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作者 M.JAFARI M.MOHAMMADIMEHR 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2026年第7期1581-1602,共22页
In this study,the frequency and vibration responses of a sandwich micro-beam are derived based on the modified couple stress theory(MCST).The face sheets are made of pure aluminum,and a magneto-rheological(MR)core is ... In this study,the frequency and vibration responses of a sandwich micro-beam are derived based on the modified couple stress theory(MCST).The face sheets are made of pure aluminum,and a magneto-rheological(MR)core is used to control vibrations.The displacement fields are assumed based on the classical beam theory(CBT)and modified classical beam theories.Based on Hamilton's principle,the governing equations of motion are obtained.To solve these temporal equations,the finite difference method(FDM)with an optimal number of nodes is applied.The effects of various parameters,including viscoelastic properties,magnetic fields,aspect ratio,core-to-face-sheet thickness ratio,MR materials,face sheets,and material length-scale parameters,on the frequency and vibrational response are investigated.In the literature,the effects of different parameters on the frequency response function(FRF)or vibration response are considered.The results obtained from the vibration response and FRF using the FDM show that the viscoelastic property of the MR core causes settling time in the vibration response and a decrease in the excitation frequency of the FRF.Increasing the magnetic field has a negligible effect on the excitation frequency in the FRF,but it increases the vibration response and settling time.The piezoelectric face sheets raise the FRF and suppress the vibration response of the MR sandwich micro-beam compared with the aluminum counterpart. 展开更多
关键词 frequency and vibration responses sandwich micro-beam magnetorheological(MR)core modified couple stress theory(MCST) finite difference method(FDM)
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Stochastic response of steel columns subjected to lateral blast based on modified single degree of freedom(MSDOF)method 认领 引用
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作者 Mohammad Momeni Chiara Bedon +1 位作者 Mohammad Ali Hadianfard Sina Malekpour 《Resilient Cities and Structures》 EI CSCD 2025年第1期1-15,共15页
This paper aims to evaluate the stochastic response of steel columns subjected to blast loads using the modified single degree of freedom(MSDOF)method,which assessed towards the conventional single degree of freedom(S... This paper aims to evaluate the stochastic response of steel columns subjected to blast loads using the modified single degree of freedom(MSDOF)method,which assessed towards the conventional single degree of freedom(SDOF)and the experimentally validated Finite Element(FE)methods(LSDYNA).For this purpose,special atten-tion is given to calculating the response of H-shaped steel columns under blast.The damage amount is determined based on the support rotation criterion,which is expressed as a function of their maximum lateral mid-span dis-placement.To account for uncertainties in input parameters and obtain the failure probability,the Monte Carlo simulation(MCS)method is employed,complemented by the Latin Hypercube Sampling(LHS)method to reduce the number of simulations.A parametric analysis is hence performed to examine the effect of several input pa-rameters(including both deterministic and probabilistic parameters)on the probability of column damage as a function of support rotation.First,the MSDOF method confirms its higher accuracy in estimating the probability of column damage due to blast,compared to the conventional SDOF.The collected results also show that un-certainties of several input parameters have significant effects on the column behavior.In particular,geometric parameters(including cross-sectional characteristics,boundary conditions and column length)have major effect on the corresponding column response,in the same way of input blast load parameters and material properties. 展开更多
关键词 Stochastic response Steel column Lateral blast Uncertainty Modified single degree of freedom(MSDOF) method Parametric analysis
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Observation on the therapeutic effect of a modified Devine procedure with subcutaneous sliding fixation method for concealed penis 认领 引用 被引量：2
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作者 Mohammed Abdulkarem Al-Qaisi Hai-Fu Tian +8 位作者 Jia-Jin Feng Ke-Ming Chen Jin Zhang Yun-Shang Tuo Xue-Hao Wang Bin-Cheng Huang Muhammad Arslan Ul Hassan Rui He Guang-Yong Li 《Asian Journal of Andrology》 SCIE CAS CSCD 2025年第4期470-474,共5页
To evaluate the therapeutic effect of a modified Devine procedure with a subcutaneous sliding fixation method for the treatment of congenital concealed penis,we retrospectively selected 45 patients with congenital con... To evaluate the therapeutic effect of a modified Devine procedure with a subcutaneous sliding fixation method for the treatment of congenital concealed penis,we retrospectively selected 45 patients with congenital concealed penises who were admitted to General Hospital of Ningxia Medical University(Yinchuan,China)between September 2020 and November 2023.In all cases,the penis was observed to be short,and retracting the skin at the base revealed a normal penile body,which immediately returned to its original position upon release.All patients underwent the modified Devine procedure with subcutaneous sliding fixation and completed a 12-week postoperative follow-up.A statistically significant increase in penile length was observed postoperatively,with the median length increasing from 4.0(interquartile range[IQR]:3.5–4.8;95%confidence interval[CI]:3.9–4.4)cm to 8.0(IQR:7.8–8.0;95%CI:7.7–7.9)cm,with P<0.001.The parents were satisfied with the outcomes,including increased penile length,improved hygiene,and enhanced esthetics.Except for mild foreskin edema in all cases,no complications(such as infections,skin necrosis,or penile retraction)were observed.The edema was resolved within 4 weeks after the operation.This study demonstrates that the modified Devine procedure utilizing the subcutaneous sliding fixation method yields excellent outcomes with minimal postoperative complications,reduced penile retraction,and high satisfaction rates among patients and their families. 展开更多
关键词 congenital concealed penis fixation method modified Devine surgery
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Lateral Bearing Capacity of Modified Suction Caissons Determined by Using the Limit Equilibrium Method 认领 引用 被引量：8
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作者 LI Da-yong MA Shi-li +1 位作者 ZHANG Yu-kun CHEN Fu-quan 《China Ocean Engineering》 SCIE EI CSCD 2018年第4期461-466,共6页
The modified suction caisson(MSC) adds a short-skirted structure around the regular suction caissons to increase the lateral bearing capacity and limit the deflection. The MSC is suitable for acting as the offshore wi... The modified suction caisson(MSC) adds a short-skirted structure around the regular suction caissons to increase the lateral bearing capacity and limit the deflection. The MSC is suitable for acting as the offshore wind turbine foundation subjected to larger lateral loads compared with the imposed vertical loads. Determination of the lateral bearing capacity is a key issue for the MSC design. The formula estimating the lateral bearing capacity of the MSC was proposed in terms of the limit equilibrium method and was verified by the test results. Parametric studies on the lateral bearing capacity were also carried out. It was found that the lateral bearing capacity of the MSC increases with the increasing length and radius of the external skirt, and the lateral bearing capacity increases linearly with the increasing coefficient of subgrade reaction. The maximum lateral bearing capacity of the MSC is attained when the ratio of the radii of the internal compartment to the external skirt equals 0.82 and the ratio of the lengths of the external skirt to the internal compartment equals 0.48, provided that the steel usage of the MSC is kept constant. 展开更多
关键词 modified suction caissons(MSCs) lateral bearing capacity limit equilibrium method parametric studies
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Density of Liquid Ni-Mo Alloys Measured by a Modified Sessile Drop Method 认领 引用 被引量：5
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作者 LiangFANG ZushuLI +1 位作者 ZaiNanTAO FengXIAO 《Journal of Materials Science & Technology》 SCIE EI CAS 2004年第3期287-292,共6页
The density of liquid binary Ni-Mo alloys with molybdenum concentration from 0 to 20% (mass fraction) wasmeasured by a modified sessile drop method. It has been found that the density of the liquid Ni-Mo alloys decrea... The density of liquid binary Ni-Mo alloys with molybdenum concentration from 0 to 20% (mass fraction) wasmeasured by a modified sessile drop method. It has been found that the density of the liquid Ni-Mo alloys decreaseswith increasing temperature, but increases with the increase of molybdenum concentration in the alloys. The molarvolume of liquid Ni-Mo binary alloys increases with the increase of temperature and molybdenum concentration. Thepartial molar volume of molybdenum in Ni-Mo binary alloy has been approximately calculated as [13.18-2.65×10-3T+(-47.94+3.10×10-2T)×10-2XMo]×10-6m^3·mol-1. The molar volume of Ni-Mo alloy determined inthe present work shows a negative deviation from the ideal linear mixing molar volume. 展开更多
关键词 Ni-Mo alloy Densityv Modified sessile drop method Molar volume Molybdenum
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Grouping response method for equivalent static wind loads based on a modified LRC method 认领 引用 被引量：10
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作者 Zhou Xuanyi Gu Ming Li Gang 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2012年第1期107-119,共13页
Wind loading is one of the most important loads for controlling the design of large-span roof structures. Equivalent static wind loads, which can generally aim at determining a specific response, are widely used by st... Wind loading is one of the most important loads for controlling the design of large-span roof structures. Equivalent static wind loads, which can generally aim at determining a specific response, are widely used by structural designers. A method for equivalent static wind loads applicable to multi-responses is proposed in this paper. A modified load- response-correlation （LRC） method corresponding to a particular peak response is presented, and the similarity algorithm implemented for the group response is described. The main idea of the algorithm is that two responses can be put into one group if the value of one response is close to that of the other response, when the structure is subjected to equivalent static wind loads aiming at the other response. Based on the modified LRC, the grouping response method is put forward to construct equivalent static wind loading. This technique can simultaneously reproduce peak responses for some grouped responses. To verify its computational accuracy, the method is applied to an actual large-span roof structure. Calculation results show that when the similarity of responses in the same group is high, equivalent static wind loads with high accuracy and reasonable magnitude of equivalent static wind distribution can be achieved. 展开更多
关键词 large-span roof equivalent static wind loads modified LRC method grouping response similarityalgorithm
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A modified domain reduction method for numerical simulation of wave propagation in localized regions 认领 引用 被引量：10
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作者 Luo Chao Lou Menglin +1 位作者 Gui Guoqing Wang Hao 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2019年第1期35-52,共18页
A modified domain reduction method(MDRM) that introduces damping terms to the original DRM is presented in this paper. To verify the proposed MDRM and compare the computational accuracy of these two methods, a numeric... A modified domain reduction method(MDRM) that introduces damping terms to the original DRM is presented in this paper. To verify the proposed MDRM and compare the computational accuracy of these two methods, a numerical test is designed. The numerical results of the MDRM and DRM are compared using an extended meshed model. The results show that the MDRM significantly improved the computational accuracy of the DRM. Then, the MDRM is compared with two existing conventional methods, namely Liao's transmitting boundary and viscous-spring boundary with Liu's method. The MDRM shows its great advancement in computational accuracy, stability and range of applications. This paper also discusses the influence of boundary location on computational accuracy. It can be concluded that smaller models tend to have larger errors. By introducing two dimensionless parameters, φ_1 and φ_2, the rational distance between the observation point and the MDRM boundary is suggested. When φ_1 >2 or φ_2>13, the relative PGA error can be limited to 5%. In practice, the appropriate model size can be chosen based on these two parameters to achieve desired computational accuracy. 展开更多
关键词 modified domain reduction method domain reduction method viscous boundary viscous spring boundary transmitting boundary wave propagation
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Density of Ni-Al Alloys in Liquid and Solid-Liquid Coexistence State Measured by a Modified Pycnometric Method 认领 引用 被引量：5
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作者 LiangFANG FengXIAO +1 位作者 ZushuLI ZainanTAO 《Journal of Materials Science & Technology》 SCIE EI CAS 2004年第4期405-410,共6页
The density of Ni-AI alloys in both liquid state and solid-liquid coexistence state was measured with a modified pycnometric method. It was found that the density of Ni-AI alloys decreases with increasing temperature ... The density of Ni-AI alloys in both liquid state and solid-liquid coexistence state was measured with a modified pycnometric method. It was found that the density of Ni-AI alloys decreases with increasing temperature and Al concentration in the alloys. The molar volume of liquid Ni-AI binary alloys increases with the increase of temperature and Al concentration. The partial molar volume of Al in Ni-AI binary alloy was calculated approximately. The molar volume of liquid Ni-AI alloy determined in the present work shows a negative deviation from the ideal linear molar volume. 展开更多
关键词 Ni-Al alloy Density Modified pycnometric method Molar volume Aluminum
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Study of Sm0.2Ce0.8O1.9(SDC) electrolyte prepared by a simple modified solid-state method 认领 引用 被引量：2
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作者 殷仕龙 李梦楠 +3 位作者 曾燕伟 李传明 陈小卫 叶祝鹏 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第8期767-771,共5页
Sm0.2Ce0.8O1.9 （SDC） electrolyte was prepared by a modified solid state method at relatively low sintering temperatures without any sintering promoters. The phase composition and microstructure of the electrolytes w... Sm0.2Ce0.8O1.9 （SDC） electrolyte was prepared by a modified solid state method at relatively low sintering temperatures without any sintering promoters. The phase composition and microstructure of the electrolytes were investigated by X-ray diffraction （XRD） and field emission scanning electron microscopy （FESEM） technologies. A relative density of SDC electrolyte sintered at 1300 ℃ reached 97.3%and the mean SDC grain size was about 770 nm. Their ionic conductivity and thermal expansion coefficient were also measured by electrochemical workstation and dilatometer. The electrolyte attained a high conductivity of 5×10^-2 S/cm at 800 ℃ with an activation energy of 1.03 eV and a proper thermal expansion coefficient of 12.6×10^-6 K^-1. 展开更多
关键词 SDC electrolyte modified solid-state method ion conductivity rare earths
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Power System State Estimation Solution With Zero Injection Constraints Using Modified Newton Method and Fast Decoupled Method in Polar Coordinate 认领 引用 被引量：14
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作者 GUO Ye ZHANG Boming +1 位作者 WU Wenchuag SUN Hongbin 《中国电机工程学报》 EI CSCD 北大核心 2012年第22期I0015-I0015,11,共1页
In actual power systems,most of the high-voltage buses of the transformers are zero injection buses without load or generation.Power injections into these buses are strictly 0,so based on Kirchhoff's current law(K... In actual power systems,most of the high-voltage buses of the transformers are zero injection buses without load or generation.Power injections into these buses are strictly 0,so based on Kirchhoff's current law(KCL),equality constraints should be used to handle these buses in a state estimation model.It is a challenge to ensure that these zero injection constraints can be strictly satisfied without losing computational efficiency. 展开更多
关键词 state estimation zero injection equality constraints polar coordinate modified Newton method modified fast decoupled state estimation
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Seismic passive earth resistance using modified pseudo-dynamic method 认领 引用 被引量：2
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作者 Anindya Pain Deepankar Choudhury S. K. Bhattacharyya 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2017年第2期263-274,共12页
In earthquake prone areas, understanding of the seismic passive earth resistance is very important for the design of different geotechnical earth retaining structures. In this study, the limit equilibrium method is us... In earthquake prone areas, understanding of the seismic passive earth resistance is very important for the design of different geotechnical earth retaining structures. In this study, the limit equilibrium method is used for estimation of critical seismic passive earth resistance for an inclined wall supporting horizontal cohesionless backfill. A composite failure surface is considered in the present analysis. Seismic forces are computed assuming the backfill soil as a viscoelastic material overlying a rigid stratum and the rigid stratum is subjected to a harmonic shaking. The present method satisfies the boundary conditions. The amplification of acceleration depends on the properties of the backfill soil and on the characteristics of the input motion. The acceleration distribution along the depth of the backfill is found to be nonlinear in nature. The present study shows that the horizontal and vertical acceleration distribution in the backfill soil is not always in-phase for the critical value of the seismic passive earth pressure coefficient. The effect of different parameters on the seismic passive earth pressure is studied in detail. A comparison of the present method with other theories is also presented, which shows the merits of the present study. 展开更多
关键词 retaining wall earthquake limit equilibrium method modified pseudo-dynamic method passive earthpressure composite failure mechanism
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A Method Suitable for Extracting Genomic DNA from Animal and Plant——Modified CTAB Method 认领 引用 被引量：27
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作者 闫苗苗 魏光成 +2 位作者 潘效红 马怀雷 李伟振 《Agricultural Science & Technology》 CAS 2008年第2期39-41,共3页
[Objective] The study aimed to introduce a rapid and effective method that is suitable for extracting genomic DNA from animal and plant. [ Method ] The genomic DNAs were extracted from tender leaves of 24 peanut cuhiv... [Objective] The study aimed to introduce a rapid and effective method that is suitable for extracting genomic DNA from animal and plant. [ Method ] The genomic DNAs were extracted from tender leaves of 24 peanut cuhivars and from the liver, lung and kidney of white mouse through the specifically modified CTAB method. The DNAs were run on agarose gel, next detected by DNA/Protein analyzer. Finally PCR amplification was conducted to detect the quality of DNAs extracted using the modified CTAB method. [ Result] The clear and orderly bands were observed in gel detection, and the values of OD200/OD200 for DNAs extracted via modified CTAB method were between 1.77 - 1.83. The DNAs performed well in PCR amplification. [ Conclusion] The DNAs extracted by modified CTAB method could satisfy the requirement of PCR amplification. 展开更多
关键词 Animal Plant Extraction of genomic DNA Modified CTAB method
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Modified Burgers' equation by the local discontinuous Galerkin method 认领 引用 被引量：6
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作者 张荣培 蔚喜军 赵国忠 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第3期106-110,共5页
In this paper,we present the local discontinuous Galerkin method for solving Burgers＇ equation and the modified Burgers＇ equation.We describe the algorithm formulation and practical implementation of the local disco... In this paper,we present the local discontinuous Galerkin method for solving Burgers＇ equation and the modified Burgers＇ equation.We describe the algorithm formulation and practical implementation of the local discontinuous Galerkin method in detail.The method is applied to the solution of the one-dimensional viscous Burgers＇ equation and two forms of the modified Burgers＇ equation.The numerical results indicate that the method is very accurate and efficient. 展开更多
关键词 local discontinuous Galerkin method modified Burgers＇ equation
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Catalytic performance of a Pt-Rh/CeO_2-ZrO_2-La_2O_3-Nd_2O_3 three-way compress nature gas catalyst prepared by a modified double-solvent method 认领 引用 被引量：11
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作者 陈建军 胡伟 +5 位作者 黄福进 李广霞 袁山东 龚茂初 钟琳 陈耀强 《Journal of Rare Earths》 SCIE EI CAS CSCD 2017年第9期857-866,共10页
A Pt-Rh three-way catalyst（M-DS） supported on CeO_2-ZrO_2-La_2O_3-Nd_2O_3 and its analogous supported catalyst（DS） were developed via a modified double-solvent method and conventional double-solvent method, respec... A Pt-Rh three-way catalyst（M-DS） supported on CeO_2-ZrO_2-La_2O_3-Nd_2O_3 and its analogous supported catalyst（DS） were developed via a modified double-solvent method and conventional double-solvent method, respectively. The as-prepared catalysts were characterized by N_2 adsorption-desorption, X-ray diffraction（XRD）, CO-chemisorption, X-ray photoelectron spectroscopy（XPS） and hydrogen temperature-programmed reduction（H_2-TPR）. The preformed Pt nanoparticles generated using ethanol as a reducing agent on M-DS presented enhanced Pt dispersion regardless of aging treatment as confirmed by XRD and CO-chemisorption measurements. The textural properties and reduction ability of M-DS were maintained to a large extent after aging treatment. This result was consistent with those of the N_2 adsorption-desorption and H_2-TPR, respectively. Meanwhile, the XPS analysis demonstrated that higher Pt^0 species and larger Ce^（3＋） concentration could be obtained for M-DS. In the conversion of a simulated compressed natural gas（CNG） vehicle exhaust, both fresh and aged M-DS showed a significant enhancement in the activity and N_2-selectivity. Particularly, the complete conversion temperature（T_（90）） of CH_4 over the aged M-DS catalyst was 65 oC lower than that over the aged catalyst by conventional double-solvent method. 展开更多
关键词 three-way catalyst compress natural gas CH_4 conversion modified double-solvent method CeO_2-ZrO_2-La_2O_3-Nd_2O_3 rare earths
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Exact Solution of Space-Time Fractional Coupled EW and Coupled MEW Equations Using Modified Kudryashov Method 认领 引用 被引量：4
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作者 K. R. Raslan Talaat S. EL-Danaf Khalid K. Ali 《Communications in Theoretical Physics》 SCIE CAS CSCD 2017年第7期49-56,共8页
In the present paper, we established a traveling wave solution by using modified Kudryashov method for the space-time fractional nonlinear partial differential equations. The method is used to obtain the exact solutio... In the present paper, we established a traveling wave solution by using modified Kudryashov method for the space-time fractional nonlinear partial differential equations. The method is used to obtain the exact solutions for different types of the space-time fractional nonlinear partial differential equations such as, the space-time fractional coupled equal width wave equation(CEWE) and the space-time fractional coupled modified equal width wave equation(CMEW), which are the important soliton equations. Both equations are reduced to ordinary differential equations by the use of fractional complex transform and properties of modified Riemann–Liouville derivative. We plot the exact solutions for these equations at different time levels. 展开更多
关键词 fractional coupled EW fractional coupled MEW equations modified Kudryashov method
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Calculation of the Ground States of H- Ion and He Atom in Magnetic Field with a Modified Configuration Interaction Method 认领 引用 被引量：2
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作者 QIAO Hao-xue RAO Jian-guo LI Bai-wen 《Chinese Physics Letters》 SCIE EI CAS 1999年第2期101-103,共3页
The modified configuration interaction method is extended to double electronic systems in magnetic fields.Eigen-values and binding energies of ground state of H- ion and He atom in uniform magnetic fields are calcu... The modified configuration interaction method is extended to double electronic systems in magnetic fields.Eigen-values and binding energies of ground state of H- ion and He atom in uniform magnetic fields are calculated.In a range running from low to intermediate magnetic fields,the best results with relative errors of 1.0×10-5 and 1.4×10-6 for H- and He,respectively,are obtained.The accuracy of our results are almost 2 orders of magnitude better than those obtained by the other methods. 展开更多
关键词 methods. Configuration Modified
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Modified slow-fast analysis method for slow-fast dynamical systems with two scales in frequency domain 认领 引用 被引量：2
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作者 Zhengdi Zhang Zhangyao Chen Qinsheng Bi 《Theoretical & Applied Mechanics Letters》 CAS CSCD 2019年第6期358-362,共5页
A modified slow-fast analysis method is presented for the periodically excited non-autonomous dynamical system with an order gap between the exciting frequency and the natural frequency.By regarding the exciting term ... A modified slow-fast analysis method is presented for the periodically excited non-autonomous dynamical system with an order gap between the exciting frequency and the natural frequency.By regarding the exciting term as a slow-varying parameter,a generalized autonomous fast subsystem can be defined,the equilibrium branches as well as the bifurcations of which can be employed to account for the mechanism of the bursting oscillations by combining the transformed phase portrait introduced.As an example,a typical periodically excited Hartley model is used to demonstrate the validness of the method,in which the exciting frequency is far less than the natural frequency.The equilibrium branches and their bifurcations of the fast subsystem with the variation of the slow-varying parameter are presented.Bursting oscillations for two typical cases are considered,which reveals that,fold bifurcation may cause the the trajectory to jump between different equilibrium branches,while Hopf bifurcation may cause the trajectory to oscillate around the stable limit cycle. 展开更多
关键词 Two scales in frequency domain Modified slow-fast analysis method Bursting oscillations Bifurcation mechanism
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Modified CTAB Method for Extracting Genomic DNA from Wheat Leaf 认领 引用 被引量：16
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作者 张晓祥 王玲 寿路路 《Agricultural Science & Technology》 CAS 2013年第7期946-949,共4页
ObjectiveThe aim was to seek for a rapid DNA minipreparation method from wheat leaf. MethodThe total DNA of wheat leaf was extracted using CTAB, SDS and boiling water, separately, with some modifications. Integrity an... ObjectiveThe aim was to seek for a rapid DNA minipreparation method from wheat leaf. MethodThe total DNA of wheat leaf was extracted using CTAB, SDS and boiling water, separately, with some modifications. Integrity and purity of nucleic acids were detected through agarose gel electrophoresis, ultraviolet absorption and PCR. ResultThe DNA extracted by the modified CTAB method had high quality and purity, and was not degraded. Two hundreds of DNA samples could be extracted each workday by per capita using this method; and the PCR detection of wheat transgenic plants showed that amplified bands of target gene were clear, without false-positive, and the test results were satisfactory. The DNA purity and concentration extracted by modified SDS method were not as good as that extracted by modified CTAB method, but it also met the DNA requirements of major molecular research. The DNA quantity extracted by modified boiling method was small and there were a lot of impurities in it, PCR detection of this DNA showed no amplified band. ConclusionModified CTAB method is a simple and rapid method for DNA minipreparation from wheat leaf, and was suitable for PCR amplification and other molecular biology researches. 展开更多
关键词 Wheat DNA extraction Modified CTAB method
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High-pressure phonon dispersion of copper by using the modified analytic embedded atom method 认领 引用 被引量：2
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作者 张晓军 陈长乐 凤飞龙 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第9期520-524,共5页
By using the Born-von Kfirmfin theory of lattice dynamics and the modified analytic embedded atom method, we reproduce the experimental results of the phonon dispersion in fcc metal Cu at zero pressure along three hig... By using the Born-von Kfirmfin theory of lattice dynamics and the modified analytic embedded atom method, we reproduce the experimental results of the phonon dispersion in fcc metal Cu at zero pressure along three high symmetry directions and four oft-symmetry directions, and then simulate the phonon dispersion curves of Cu at high pressures of 50, 100, and 150 GPa. The results show that the shapes of dispersion curves at high pressures are very similar to that at zero pressure. All the vibration frequencies of Cu in all vibration branches at high pressures are larger than the results at zero pressure, and increase correspondingly as pressure reaches 50, 100, and 150 GPa sequentially. Moreover, on the basis of phonon dispersion, we calculate the values of specific heat of Cu at different pressures. The prediction of thermodynamic quantities lays a significant foundation for guiding and judging experiments of thermodynamic properties of solids under high pressures. 展开更多
关键词 phonon dispersion high pressure simulation modified analytic embedded atom method
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Synthesis of mesoporous carbon as electrode material for supercapacitor by modified template method 认领 引用 被引量：3
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作者 赵家昌 赖春艳 +1 位作者 戴扬 解晶莹 《Journal of Central South University of Technology》 2005年第6期647-652,共6页
The pore structures and electrochemical performances of mesoporous carbons prepared by silica sol template method as electrode material for supercapacitor were investigated. The mean pore size and mass specific capaci... The pore structures and electrochemical performances of mesoporous carbons prepared by silica sol template method as electrode material for supercapacitor were investigated. The mean pore size and mass specific capacitance of the mesoporous carbons increase with the increase of mass ratio of silica sol to carbon source （glucose）. A modified template method, combining silica sol template method and ZnCl2 chemical activation method, was proposed to improve the mass specific capacitance of the mesoporous carbon with an improved BET surface area. The correlation of rate capability and pore structure was studied by constant current discharge and electrochemical impedance spectroscopy. A commercially available microporous carbon was used for comparison. The result shows that mesoporous carbon with a larger pore size displays a higher rate capability. Mesoporous carbon synthesized by modified template method has both high mass specific capacitance and good rate capability. 展开更多
关键词 supercapacitor mesoporous carbon modified template method electrochemical performance synthesis
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