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威力FORCE2-8PCH型高频电刀的故障维修 被引量:2
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作者 吴汉曦 王国宏 《医疗设备信息》 2002年第11期60-60,共1页
关键词 force2-8PCH型 高频电刀 故障维修
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Pressure Gradient Force,Saffman Lift,and Magnus Lift on the Fiber-like Particle in Fluid 被引量:5
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作者 朱泽飞 林建忠 《Journal of China Textile University(English Edition)》 EI CAS 2000年第2期23-27,共5页
Flher-like particle suspensions are common in both na-ture and industry, but there is little work reported on it.The forces acting on the fiber - like particle in fluid arestudied in this paper, and the Magnus lift, S... Flher-like particle suspensions are common in both na-ture and industry, but there is little work reported on it.The forces acting on the fiber - like particle in fluid arestudied in this paper, and the Magnus lift, Saffman lift,pressure gradient force, and then the dynamics modelhave been received. The numerical study of the simpleshear flow past the cylinders shows that the particles ’motion is controlled by the vortex. 展开更多
关键词 multi - phase FLUID FIBER - LIKE PARTICLE force analysis
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Reducing force transmissibility in multiple degrees of freedom structures through anti-symmetric nonlinear viscous damping 被引量:4
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作者 Z.-K.Peng Z.-Q.Lang +1 位作者 G.Meng S.A.Billings 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2012年第5期1436-1448,共13页
In the present study, the Volterra series theory is adopted to theoretically investigate the force transmissibility of multiple degrees of freedom (MDOF) structures, in which an isolator with nonlinear anti-symmetri... In the present study, the Volterra series theory is adopted to theoretically investigate the force transmissibility of multiple degrees of freedom (MDOF) structures, in which an isolator with nonlinear anti-symmetric viscous damping is assembled. The results reveal that the anti-symmetric nonlinear viscous damping can significantly reduce the force trans- missibility over all resonance regions for MDOF structures with little effect on the transmissibility over non-resonant and isolation regions. The results indicate that the vibration isolators with an anti-symmetric damping characteristic have great potential to solve the dilemma occurring in the design of linear viscously damped vibration isolators where an increase of the damping level reduces the force transmissibility over resonant frequencies but increases the transmissibility over non-resonant frequency regions. This work is an extension of a previous study in which MDOF structures installed on the mount through an isolator with cubic nonlinear damping are considered. The theoretical analysis results are also verified by simulation studies. 展开更多
关键词 Nonlinear viscous damping force transmissibility - Vibration isolation Volterra series
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Numerical Analysis of the Adhesive Forces in Nano-Scale Structure 被引量:1
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作者 Young-Sam Cho Houkseop Han Wan-Doo Kim 《Journal of Bionic Engineering》 SCIE EI CSCD 2006年第4期209-216,共8页
Nanohairs, which can be found on the epidermis of Tokay gecko's toes, contribute to the adhesion by means of van der Waals force, capillary force, etc. This structure has inspired many researchers to fabricate the at... Nanohairs, which can be found on the epidermis of Tokay gecko's toes, contribute to the adhesion by means of van der Waals force, capillary force, etc. This structure has inspired many researchers to fabricate the attachable nano-scale structures. However, the efficiency of artificial nano-scale structures is not reliable sufficiently. Moreover, the mechanical parameters related to the nano-hair attachment are not yet revealed qualitatively. The mechanical parameters which have influence on the ability of adhesive nano-hairs were investigated through numerical simulation in which only van der Waals force was considered. For the numerical analysis, finite element method was utilized and van der Waals force, assumed as 12-6 Lennard-Jones potential, was implemented as the body force term in the finite element formulation. 展开更多
关键词 NUMERICAL analysis adhesive force nano-scale structure finite element model van der Waals force 12-6 L-J potential
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An integrated approach for the optimization of wheel-rail contact force measurement systems 被引量:3
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作者 S.Papini L.Pugi +1 位作者 A.Rindi E.Meli 《Journal of Modern Transportation》 2013年第2期95-102,共8页
A comprehension of railway dynamic behavior implies the measure of wheel-rail contact forces which are affected by disturbances and errors that are often difficult to be quantified. In this study, a benchmark test cas... A comprehension of railway dynamic behavior implies the measure of wheel-rail contact forces which are affected by disturbances and errors that are often difficult to be quantified. In this study, a benchmark test case is proposed, and a bogie with a layout used on some European locomotives such as SIEMENS El90 is studied. In this layout, an additional shaft on which brake disks are installed is used to transmit the braking torque to the wheelset through a single-stage gearbox. Using a mixed approach based on finite element techniques and statistical considerations, it is possible to evaluate an optimal layout for strain gauge positioning and to optimize the measurement system to diminish the effects of noise and disturbance. We also conducted preliminary evaluations on the precision and frequency response of the proposed system. 展开更多
关键词 Wheel-rail interaction Contact force - Straingauge
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Steady vortex force theory and slender-wing flow diagnosis 被引量:1
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作者 Y.T.Yang R.K.Zhang +1 位作者 Y.R.An J.Z.Wu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2007年第6期609-619,共11页
The concept vortex force in aerodynamics is sys- tematically examined based on a new steady vortex-force theory (Wu et al., Vorticity and vortex dynamics, Springer, 2006) which expresses the aerodynamic force (and ... The concept vortex force in aerodynamics is sys- tematically examined based on a new steady vortex-force theory (Wu et al., Vorticity and vortex dynamics, Springer, 2006) which expresses the aerodynamic force (and moment) by the volume and boundary integrals of the Lamb vector. In this paper, the underlying physics of this theory is explored, including the general role of the Lamb vector in non- linear aerodynamics, its initial formation, and its relevance to the total-pressure non-uniformity. As a typical example, the theory is applied to the flow over a slender delta wing at a large angle of attack. The highly localized flow structures with high Lamb-vector peaks are identified in terms of their net contribution to various constituents of the total aerody-namic force. This vortex-force diagnosis sheds new light on the flow control and configuration optimization. 展开更多
关键词 Vortex force - Delta-wing - Flow control
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Calculation of Radii and Density of ^(7-19)B Isotopes Using Effective Skyrme Force
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作者 E.Tel S.Okuducu +2 位作者 G.Tatar N.N.Akti M.H.Blükdemir 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第3期696-702,共7页
Abstract In this study, the proton and neutron densities, charge densities, rms nuclear charge radii, rms nuclear mass radii, rms nuclear proton, neutron radii, and neutron skin thickness are calculated by using Harfr... Abstract In this study, the proton and neutron densities, charge densities, rms nuclear charge radii, rms nuclear mass radii, rms nuclear proton, neutron radii, and neutron skin thickness are calculated by using Harfree-Fock method with an effective nucleon-nucleon Skyrme interactions with SⅠ, SⅡ, SⅣ, T3, SKM, and SKM^* parameters. These nuclear properties for the neutron-rich isotopes of B (Boron) are presented. The calculated results are compared with the experimental and theoretical results of other researchers. 展开更多
关键词 ^7-9B isotopes halo nuclei Skyrme force Hartree-Fock calculations
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China's WTO Accession and Sustainable Development ----- 2002 Report by Task Force on WTO and Environment, November 23-25, 2002, Beijing, China
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《China Population Today》 2002年第Z1期27-36,共10页
关键词 WTO China’s WTO Accession and Sustainable Development November 23-25 Report by Task force on WTO and Environment BEIJING China
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Quantization of the 1-D Forced Harmonic Oscillator in the Space (<i>x</i>, <i>v</i>)
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作者 Gustavo V. López Omar J. P. Bravo 《Journal of Modern Physics》 2021年第3期284-294,共11页
The quantization of the forced harmonic oscillator is studied with the quantum variable (<em>x</em>, <span style="white-space:nowrap;"><em><sub>v</sub><sup style="... The quantization of the forced harmonic oscillator is studied with the quantum variable (<em>x</em>, <span style="white-space:nowrap;"><em><sub>v</sub><sup style="margin-left:-8px;">∧</sup></em></span>), with the commutation relation <img src="Edit_28f5b839-7de4-41e5-9ed8-69dc1bf72c2c.bmp" alt="" />, and using a Schr<span style="white-space:nowrap;"><span style="white-space:nowrap;"><span style="white-space:nowrap;">&ouml;</span></span></span>dinger’s like equation on these variable, and associating a linear operator to a constant of motion <em>K</em> (<em>x, v, t</em>) of the classical system, The comparison with the quantization in the space (<em>x, p</em>) is done with the usual Schr<span style="white-space:nowrap;"><span style="white-space:nowrap;"><span style="white-space:nowrap;">&ouml;</span></span></span>dinger’s equation for the Hamiltonian <em>H</em><span style="white-space:normal;">(</span><em style="white-space:normal;">x, p, t</em><span style="white-space:normal;">)</span>, and with the commutation relation <img src="Edit_cca7e318-5b35-4c55-8f09-6089970ce9a2.bmp" alt="" />. It is found that for the non-resonant case, both forms of quantization bring about the same result. However, for the resonant case, both forms of quantization are different, and the probability for the system to be in the exited state for the (<em style="white-space:normal;">x</em><span style="white-space:normal;">, </span><em><sub>v</sub><sup style="margin-left:-8px;">∧</sup></em>) quantization has fewer oscillations than the (<em style="white-space:normal;">x</em><span style="white-space:normal;">, </span><em style="white-space:normal;"><sub>p</sub><sup style="margin-left:-8px;">∧</sup></em>) quantization, the average energy of the system is higher in (<em style="white-space:normal;">x</em><span style="white-space:normal;">, </span><em style="white-space:normal;"><sub>p</sub><sup style="margin-left:-8px;">∧</sup></em>) quantization than on the (<em style="white-space:normal;">x</em><span style="white-space:normal;">, </span><em style="white-space:normal;"><sub>v</sub><sup style="margin-left:-8px;">∧</sup></em>) quantization, and the Boltzmann-Shannon entropy on the (<em style="white-space:normal;">x</em><span style="white-space:normal;">, </span><em style="white-space:normal;"><sub>p</sub><sup style="margin-left:-8px;">∧</sup></em>) quantization is higher than on the (<em style="white-space:normal;">x</em><span style="white-space:normal;">, </span><em style="white-space:normal;"><sub>v</sub><sup style="margin-left:-8px;">∧</sup></em>) quantization. 展开更多
关键词 forced Harmonic Oscillator (x v style="margin-left:-8px ">∧) Quantization Constant of Motion
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Safety evaluation for railway vehicles using an improved indirect measurement method of wheel–rail forces 被引量:8
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作者 Jing Zeng Lai Wei Pingbo Wu 《Journal of Modern Transportation》 2016年第2期114-123,共10页
The wheel-rail force measurement is of great importance to the condition monitoring and safety evaluation of railway vehicles. In this paper, an improved indirect method for wheel-rail force measurement is proposed to... The wheel-rail force measurement is of great importance to the condition monitoring and safety evaluation of railway vehicles. In this paper, an improved indirect method for wheel-rail force measurement is proposed to evaluate the running safety of railway vehicles. In this method, the equilibrium equations of a suspended wheelset are derived and the wheel-rail forces are then be obtained from measured suspension and inertia forces. This indirect method avoids structural modifications to the wheelset and is applicable to the long-term operation of railway vehicles. As the wheel-rail lateral forces at two sides of the wheelset are difficult to separate, a new derailment criterion by combined use of wheelset derailment coefficient and wheel unloading ratio is proposed. To illustrate its effectiveness, the indirect method is applied to safety evaluation of rail- way vehicles in different scenarios, such as the cross wind safety of a high-speed train and the safety of a metro vehicle with hunting motions. Then, the feasibility of using this method to identify wheel-rail forces for low-floor light rail vehicles with resilient wheels is discussed. The values identified by this method is compared with that by Simpack simulation for the same low-floor vehicle, which shows a good coincidence between them in the time domain of the wheelset lateral force and the wheel-rail vertical force. In addition, use of the method to determine the high-frequency wheel-rail interaction forces reveals that it is possible to identify the high-frequency wheel-rail forces through the accelerations on the axle box. 展开更多
关键词 Wheel-rail force Safety evaluation - Indirect method Union safety domain Wheelset derailment coefficient Hunting motions Cross wind Low-floor vehicle
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NUMERICAL SIMULATION OF STRESS-STRAIN DISTRIBUTIONS FOR WELD METAL SOLIDIFICATION CRACKING IN STAINLESS STEEL 被引量:2
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作者 Y. H. Wei R. P. Liu and Z. J. Dong( 1) National Key Laboratory of Advanced Welding Production Technology, HIT, Harbin 150001, China 2) Harbin Research institute of Welding,Harbin 150080, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第1期133-138,共6页
This paper analyzed the characteristics of welding solidification crack of stainless steels,and clearly re- vealed the the of the deformation in the molten - the pool and the solidification shrinkage on the stress -... This paper analyzed the characteristics of welding solidification crack of stainless steels,and clearly re- vealed the the of the deformation in the molten - the pool and the solidification shrinkage on the stress - strain fields in the trail of molten - weld pool.Moreover, rheologic properties of the alloys in solid - liquid zone were also obtained by measuring the hading and unloading deform curves of the steels.As a result, a numerical model for simulation of stress - strain distributions of welding solidifi- cation crack was developed. On the basis of the model,the thesis simulated the driving force of solidifi- cation crack of stainless steels, that is, stress - strain fields in the trail of molten-weld pool with fi- nite element method. 展开更多
关键词 welding solidification crack welding solidification crack driving force finite element method stress - strain field numerical simulation
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Structural and Vibrational Study of 2-(Quinolin-8-yloxy)-Acetic Acid based on FT-IR-Raman Spectroscopy and DFT Calculations 被引量:1
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作者 Gerardo R. Arganaraz Elida Romano +1 位作者 Juan Zinczuk Silvia A. Brandan 《Journal of Chemistry and Chemical Engineering》 2011年第8期747-758,共12页
We have prepared the 2-(quinolin-8-yloxy)-acetic acid and characterized it by infrared and Raman spectroscopies in the solid phase. The Density Functional Theory (DFT) method, together with the 6-31G^* and 6-311... We have prepared the 2-(quinolin-8-yloxy)-acetic acid and characterized it by infrared and Raman spectroscopies in the solid phase. The Density Functional Theory (DFT) method, together with the 6-31G^* and 6-311++ G^** basis sets, show that three stable molecules, for the anhydrous and monohydrated compounds were theoretically determined in the gas phase, and that probably the two more stable conformations are present in the solid phase of the monohydrated compound. The harmonic vibrational wavenumbers for the optimized geometries were calculated at B3LYP/6-31G^*and B3LYP/6-311++G^** levels. For a complete assignment of all the observed bands in the vibrational spectra the DFT calculations were combined with Pulay's scaled quantum mechanical force field (SQMFF) methodology in order to fit the theoretical Wavenumber values to the experimental ones. The characteristics of the electronic delocalization of all structures of both forms were performed by using natural bond orbital (NBO), while the corresponding topological properties of electronic charge density are analysed by employing Bader's atoms in molecules theory (AIM). 展开更多
关键词 2-(Quinolin-8-yloxy)-acetic acid vibrational spectra molecular structure force field DFT calculations
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STUDY ON DYNAMICS OF TROPICAL CISK-ROSSBY WAVES AND MECHANISM OF 30-50 DAY OSCILLATIONS
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作者 张韧 余志豪 蒋全荣 《Journal of Tropical Meteorology》 SCIE 2001年第1期69-79,共10页
To add to the growing mature research on the tropical 30-50 day oscillations from a new prospective, the current work bases on dynamic analysis of baroclinic quasi-geostrophic models to discuss dynamic mechanisms for ... To add to the growing mature research on the tropical 30-50 day oscillations from a new prospective, the current work bases on dynamic analysis of baroclinic quasi-geostrophic models to discuss dynamic mechanisms for the generation and propagation of CISK-Rossby waves, and to understand restraints and effects of different wave structures and thermodynamic forcing on the 30-50 day oscillations in the tropical atmosphere. Some important properties of the oscillation propagation have been explained and, in detail, with respect to its meridional propagation and vertical "baroclinic" structure. The work has come up with some new opinions and viewpoints. New opinions about the propagation and energy dispersion are to be proved by more observations and study. 展开更多
关键词 CISK-Rossby wave 30-50 day oscillation thermodynamic forcing
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Novel Copper(II) and Zinc(II) 2-D Supramolecular Structures Based on Carboxylate and 1-Substitutedimidazole Mixed-ligands
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作者 才华 郭英 +1 位作者 栗建刚 吴瑶 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2011年第11期1563-1568,共6页
Using the ligand bis(3-(1H-imidazol-1-yl)-1-phenylpropan-1-one) L, two novel complexes [CuL2(ph))]·H2O 1 and [ZnL2(tp)] 2 (ph = phthalic acid, tp = terephthalic acid) have been synthesized and their cr... Using the ligand bis(3-(1H-imidazol-1-yl)-1-phenylpropan-1-one) L, two novel complexes [CuL2(ph))]·H2O 1 and [ZnL2(tp)] 2 (ph = phthalic acid, tp = terephthalic acid) have been synthesized and their crystal structures were determined by single-crystal X-ray diffraction analysis. Crystal data for 1: triclinic, space group P1^-, a = 9.4300(17), b = 12.148(2), c = 13.721(2) A, a = 109.620(2),β = 94.351(2), y = 94.830(2)°, C32H30N4O7Cu, Mr = 646.14, V= 1466.2(4) A^3, Z = 2, Dc = 1.464 g/cm3, It(MoKa) = 0.801 mm^-1, F(000) = 670, the final R = 0.0337 and wR = 0.0859 for 5122 observed reflections with I 〉 2σ(I), And those for 2: monoclinic, space group P2/n, a = 7.1866(11), b = 14.144(2), c = 14.407(2)/k, β = 101.427(2)°, C32H28N4O6Zn, Mr = 629.95, V = 1435.4(4) A3, Z = 2, Dc = 1.457 g/cm3, μ(MoKa) = 0.908 mm^-1, F(000) = 652, the final R = 0.0438 and wR= 0.0821 for 2546 observed reflections with I〉 2σ(I). In 1 and 2, ph or tp ligauds bridge the six-coordinated copper(Ⅱ) or four-coordinated zinc(Ⅱ) ions forming 1D zigzag chains while L ligands act as the terminal monodentate ligand. It is noted that weak non-classical C-H…O plays the important and dominating roles in the formation of 2D supramolecular architectures of 1, but in 2 non-classical C-H…O and aromatic π…π Stacking interactions are quite important and play dominant roles in the self-assembly of 2D supramolecular architectures. 展开更多
关键词 3-(1H-imidazol-1-yi)-1-phenylpropan-1-one π…π stacking driving forces
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EXACT SOLUTION FOR RECTANGULAR SLAB WITH THREE EDGES SIMPLY-SUPPORTED AND OTHER FREE
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作者 YU TENGHAIDepartment of Mathematics 《内江师范学院学报》 1996年第2期1-7,共7页
In this paper,we give all-sided pastic analysis of the rectangular slab with three edges simply-supported and other free.Here we discuss the following four cases:(1)The uniformly distributedload over the area a slab.(... In this paper,we give all-sided pastic analysis of the rectangular slab with three edges simply-supported and other free.Here we discuss the following four cases:(1)The uniformly distributedload over the area a slab.(2).A concentrated load act at midpoint of free edges slab.(3)A concen-trated load act at the center a slab.(4)The line load act along free edge of slab. 展开更多
关键词 The RECTANGULAR SLAB with three EDGES simply - SUPPORTED and OTHER free have wide the use value. But up to now only find the EXACT solution that a concentrated load act at midpoint of free edye a slab. The EXACT solution of OTHER support force
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基于Force Control的镍渣粉储运集中控制系统的设计
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作者 张宣超 《中国水泥》 CAS 2020年第1期85-88,共4页
某水泥有限公司镍渣输送、掺料项目于2017年3月~8月完成设计、施工、调试、投产等相关工作,该控制系统是基于Force Control和西门子S7-1200 PLC设计而成,实现了操渣粉储存、输送、定量掺配,同时系统还具备实时在线标定、产量统计报表、... 某水泥有限公司镍渣输送、掺料项目于2017年3月~8月完成设计、施工、调试、投产等相关工作,该控制系统是基于Force Control和西门子S7-1200 PLC设计而成,实现了操渣粉储存、输送、定量掺配,同时系统还具备实时在线标定、产量统计报表、系统电力能耗统计等功能。 展开更多
关键词 force Control S7-1200 PLC 集中控制 镍渣粉输送 计量 掺配
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A Tool for the Assessment of the Electromagnetic Forces in Power Distribution Transformers
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作者 A. da Costa Lopes M.A. Sanz-Bobi +3 位作者 L. Rouco R. Palacios L. Flores P. Cirujano 《Journal of Energy and Power Engineering》 2011年第10期972-977,共6页
This paper compares the estimated electromagnetic forces due to short circuits in power transformers using two computational models. The first model is based on approximate analytical expressions of the electromagneti... This paper compares the estimated electromagnetic forces due to short circuits in power transformers using two computational models. The first model is based on approximate analytical expressions of the electromagnetic lbrces as they have been compiled in earlier versions of the IEC standard 60076-5. The second model is based on a finite element model of the transformer using the software FEMM (Finite Element Method Magnetics). The paper shows how valid the analytical model is for design purposes. Results have been obtained and compared from both models in a number of actual power distribution transformers. It is possible to conclude that the analytical formulation provides satisfactory results for the design of power transformers compared to detailed finite element models. A tool has been designed for this purpose and the main features of it will be described in the paper. 展开更多
关键词 Electromagnetic forces power transformer SHORT-CIRCUIT IEC 60076-5.
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威力FORCE2—8PCH型高频电刀的故障维修
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作者 李林献 《中华医学研究与实践》 2004年第11期45-45,共1页
威力FORCE2—8PCH型高频电刀操作方便,可靠性高,完全能满足外科手术的需要。整机由低压电源板、双极显示板、CPU板、接口板、功率放大输出板五大部分组成,各部分电路功能如下。低压电源板输出+5V、+12V和-12V三组直流电压给整机各部... 威力FORCE2—8PCH型高频电刀操作方便,可靠性高,完全能满足外科手术的需要。整机由低压电源板、双极显示板、CPU板、接口板、功率放大输出板五大部分组成,各部分电路功能如下。低压电源板输出+5V、+12V和-12V三组直流电压给整机各部分电路供电:双极显示板用于显示不同工作模式下的功率设定值; 展开更多
关键词 威力force2-8PCH型高频电刀 故障 检查 维修
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Visualizing the Spin & Radiation of the Extended Electron in Magnetic Field
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作者 Hoa Van Nguyen 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2024年第1期277-291,共15页
This article presents illustrations of an extended model of the electron to visualize how it spins and radiates in the external magnetic field. A time-varying magnetic field B produces a rotational induced electric fi... This article presents illustrations of an extended model of the electron to visualize how it spins and radiates in the external magnetic field. A time-varying magnetic field B produces a rotational induced electric field E which rotates (spins) the electron about its axis. In time-constant magnetic field: the electron radiates the cyclotron radiation. In time-varying magnetic field: synchrotron radiation is generated. The couplings between spin, acceleration and radiation will be discussed. 展开更多
关键词 Spinning forces Spin by Inertia Radiating forces Photon or Static Electric Dipole Cloud of Photons Spin - Radiation Coupling
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Numerical simulation and experimental study of the hydrodynamics of a modeled reef located within a current 被引量:20
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作者 姜昭阳 梁振林 +3 位作者 唐衍力 黄六一 于定勇 姜曼松 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2010年第2期267-273,共7页
The hydrodynamic forces and flow field of artificial reef models in steady flow were numerically investigated using the RNG κ-ε turbulent model. The numerical simulation results are consistent with results observed ... The hydrodynamic forces and flow field of artificial reef models in steady flow were numerically investigated using the RNG κ-ε turbulent model. The numerical simulation results are consistent with results observed by experimental means. A comparative study indicates that the corresponding errors of forces between calculated values and values observed in the experiment vary in the range of2.3%-11.2% and that the corresponding errors of velocities vary in the range of 1.3%-15.8%. The flow field numerical results show that upstream and vortices exist when the current passes over and through the surface of the reef model. This study suggests that the numerical simulation method can be applied to predict the forces and flow field associated with artificial reefs. 展开更多
关键词 artificial reef model hydrodynamic forces flow field RNG κ-ε turbulent model
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