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2011-10-01 | An effective countermeasure against vibration under limitation of volume and weight of small satellites is to insert thin polyimide tape between structural elements, especially for structural vibration of a small satellite during its launch. In this study, we deal with three types of aluminum elastic beams clamped on a... | A New Approach to Vibration Reduction Analysis Using Thin Polyimide Tape Inserted between Structural Elements | 10.1007/s11340-010-9447-y |
2011-10-01 | This paper addresses the time history finite element analysis of rock-structure interaction. Modeled is not only the lateral energy dissipation, but also the interaction between the far field and the numerical model itself. This is accomplished by a preliminary analysis of the far field as a shear beam (for lateral exc... | A simplified 3D model for soil-structure interaction with radiation damping and free field input | 10.1007/s10518-011-9261-7 |
2011-10-01 | Across-wind loads and effects have become increasingly important factors in the structural design of super-tall buildings and structures with increasing height. Across-wind loads and effects of tall buildings and structures are believed to be excited by inflow turbulence, wake, and inflow-structure interaction, which a... | Across-wind loads and effects of super-tall buildings and structures | 10.1007/s11431-011-4543-5 |
2011-10-01 | The direct displacement based seismic design procedure utilises equivalent viscous damping expressions to represent the effect of energy dissipation of a structural system. Various expressions for the equivalent viscous damping of different structural systems are available in the literature, but the structural systems ... | Equivalent viscous damping for steel concentrically braced frame structures | 10.1007/s10518-011-9272-4 |
2011-10-01 | The radial trends of vibrational properties, represented by the specific dynamic modulus ( E ′/ ρ ) and damping coefficient (tan δ ), were investigated for three tropical rainforest hardwood species ( Simarouba amara , Carapa procera , and Symphonia globulifera ) using free-free flexural vibration tests. The microfibri... | Radial variations of vibrational properties of three tropical woods | 10.1007/s10086-011-1189-7 |
2011-10-01 | The pathophysiology of l -dopa-induced dyskinesias (LIDs) in Parkinson’s disease (PD) remains poorly understood. The presence of superimposed LIDs clearly differentiates motor performance of dyskinetic from non-dyskinetic PD subjects when they are on medication, but here, we investigated whether their respective motor ... | Dyskinetic Parkinson’s disease patients demonstrate motor abnormalities off medication | 10.1007/s00221-011-2845-2 |
2011-10-01 | Effects of soil pH on damping-off of sugar beet by R. solani (AG2-2) and soil suppressiveness against the disease were studied by comparing disease incidences in pasteurized versus non-pasteurized, infested soils. Soil pH was correlated neither to disease incidence in five soils ranging from pH 4.5 to 7.2 nor to indige... | Effects of soil pH on rhizoctonia damping-off of sugar beet and disease suppression induced by soil amendment with crop residues | 10.1007/s11104-011-0843-6 |
2011-10-01 | The active damping of the resonant vibrations of a hinged flexible viscoelastic rectangular plate with distributed piezoelectric sensors and actuators is considered. It is shown that it is possible to considerably decrease the amplitude of resonant vibrations by choosing the appropriate feedback factor. The collective ... | Active damping of the resonant vibrations of a flexible viscoelastic rectangular plate | 10.1007/s10778-011-0472-z |
2011-10-01 | Possible interactions between seismic early warning systems and structural control are herein investigated. A SEWS can provide the knowledge of some parameters, ahead of time, of the seismic event that is going to occur in a certain site. Current research activities on SEWS include the estimate of the anticipated peak ... | Semi-active control of the benchmark highway bridge based on seismic early warning systems | 10.1007/s10518-011-9259-1 |
2011-09-27 | A simple method for measuring amide hydrogen exchange rates is presented, which is based on the selective inversion of water magnetization with the use of radiation damping. Simulations show that accurate exchange rates can be measured despite the complications of radiation damping and cross relaxation to the exchange ... | Measurement of amide hydrogen exchange rates with the use of radiation damping | 10.1007/s10858-011-9549-6 |
2011-09-01 | A DC hybrid power source composed of photovoltaic cells as the main power source, Li-ion battery storage as the secondary power source, and power electronic interface, is modeled based on port-controlled Hamiltonian systems and Euler-Lagrange framework. Subsequently, passivity-based controllers are synthesized. Local a... | Interconnection and damping assignment and Euler-Lagrange passivity-based control of photovoltaic/battery hybrid power source for stand-alone applications | 10.1631/jzus.C1000368 |
2011-09-01 | Air-foil bearings (AFBs) are self acting hydrodynamic bearings made from sheet metal foils comprised of at least two layers. The innermost “top foil” layer traps a gas pressure film that supports a load while the layer or layers underneath provide an elastic foundation. AFBs are currently used in many commercial applic... | Identification of stiffness and damping characteristics of axial air-foil bearings | 10.1007/s10999-011-9161-7 |
2011-09-01 | Calculation formulas were obtained for determining the shape of an acoustic pulse radiated by a piezoelectric plate that has a mechanical damper and a correcting electric circuit and is excited by electric pulses with durations that are multiples of an integer number of half periods at the antiresonance frequency ω_0. ... | Possibilities for reducing the duration of acoustic pulses generated by a piezoelectric plate using a damper or an electric RL circuit for a plate excited by electric pulses of different durations | 10.1134/S1061830911090063 |
2011-09-01 | The optimisation of earthquake resistance of high buildings by multi-tuned mass dampers was investigated using bionic algorithms. In bionic or evolutionary optimisation studies the properties of parents are crossed and mutated to produce a new generation with slightly different properties. The kids which best satisfy t... | Bionic optimisation of the earthquake resistance of high buildings by tuned mass dampers | 10.1016/S1672-6529(11)60036-X |
2011-08-20 | In this paper, a small displacement-type magnetorheological grease (MRG) damper based on disk squeeze mode is proposed. The squeeze flow differential equation is obtained. The Navier slip condition is considered on the surfaces and the boundary compatible condition is established. The radial velocity profiles and the r... | Analytical study on damping performances of magnetorheological grease damper based on disk squeeze mode and experimental test | 10.1007/s11465-011-0235-x |
2011-08-01 | The linear and nonlinear steady-state viscosities and elastic compliances were measured in shear and elongational flows for two low-density polyethylenes, a linear polypropylene, and two metallocene catalyzed polyethylenes (one linear and one long-chain branched) by Wolff et al. (Rheol Acta 49:95–103, 2010 ) and Resch ... | Prediction of steady-state viscous and elastic properties of polyolefin melts in shear and elongation | 10.1007/s00397-011-0546-1 |
2011-08-01 | This paper investigates the dynamics of frictional-type winding mechanisms widely used in textile industry. The mechanism under study is used to wind various kinds of thread onto bobbins of cylindrical form. The system essentially consists of a motor-driven cylinder which is pressed to a cylindrical bobbin hence bringi... | Lagrangian modeling and analysis of the dynamics of frictional winding mechanisms | 10.1007/s11044-011-9254-y |
2011-08-01 | The performance of surface damping treatments may vary once the surface is exposed to a wide range of temperatures, because the performance of viscoelastic damping material is highly dependent on operational temperature. In addition, experimental data for dynamic responses of viscoelastic material are inherently random... | A statistical characterization method for damping material properties and its application to structural-acoustic system design | 10.1007/s12206-011-0517-6 |
2011-08-01 | The mechanical properties of elastomers can change significantly due to air temperature variations. In particular, prolonged exposure to subzero temperatures can result in rubber crystallization, with a considerable increase in the shear stiffness of the material. As a result, the seismic response of structures with el... | Effects of air temperature on the cyclic behavior of elastomeric seismic isolators | 10.1007/s10518-011-9244-8 |
2011-08-01 | This paper considers the main patterns of damping of stress waves in disperse and semi-rock soils. We determined two strain thresholds, beyond which the damping ratio qualitatively changes: in the region of relative deformations up to 10^−4 the damping ratio can be considered to be constant and is caused by non-ideal e... | The nature and patterns of damping of stress waves in soils | 10.3103/S0145875211040120 |
2011-08-01 | An analytical approximate method for strongly nonlinear damped oscillators is proposed. By introducing phase and amplitude of oscillation as well as a bookkeeping parameter, we rewrite the governing equation into a partial differential equation with solution being a periodic function of the phase. Based on combination ... | Construction of approximate analytical solutions to strongly nonlinear damped oscillators | 10.1007/s00419-010-0465-0 |
2011-08-01 | Anthracycline antibiotics are inducers of an immunogenic form of apoptosis that has immunostimulatory properties because of the release of damage-associated molecular patterns. To study the mechanisms used by the innate immune system to sense this immunogenic form of cell death, we established an in vivo model of cell ... | TLR-2 and TLR-9 are sensors of apoptosis in a mouse model of doxorubicin-induced acute inflammation | 10.1038/cdd.2011.4 |
2011-07-01 | A mechanism for the excitation of piston rod vibrations in automotive damper modules is discussed by a simple model. An improved nonlinear model based on elasticity effects leads to good simulation results. It is shown theoretically and experimentally that the adaptation of the stiffness of the piston rod bushing to th... | Damper modules with adapted stiffness ratio | 10.1007/s00419-010-0455-2 |
2011-07-01 | At high operational speeds, the train system becomes very sensitive to parameter variations of components. Therefore, it is imperative to incorporate more accurate component models in the vehicle dynamics studies. This study addresses a more subtle and comprehensive non-linear parametric model of a high-speed rail hydr... | Non-linear parametric modelling of a high-speed rail hydraulic yaw damper with series clearance and stiffness | 10.1007/s11071-010-9871-7 |
2011-07-01 | Under the assumptions of classical linearised water-wave theory, the time-harmonic two-dimensional motion of a rigid body floating in the surface of a fluid may be characterised by various coefficients which express components of the hydrodynamic forces acting on that body. For a single body in isolation, these are rel... | Estimation of wall effects on floating cylinders | 10.1007/s10665-010-9420-x |
2011-07-01 | In this article, an advanced laminated composite is developed, combining the high damping properties of shape memory alloy (SMA) with mechanical properties and light weight of a glass-fiber reinforced polymer. The composite is formed by stacking a glass-fiber reinforced epoxy core between two thin patterned strips of S... | Simulated and Experimental Damping Properties of a SMA/Fiber Glass Laminated Composite | 10.1007/s11665-011-9887-2 |
2011-07-01 | Nowadays, many manufacturing processes require the machining of complex forms with a high aspect ratio or cavities. Tools with a long overhang length are a common method to meet these requirements. Typical examples for this are boring bars for bore-turning and the milling with very long cutters. These tools tend to vib... | Processing and Damping Properties of Sputtered NiTi Thin Films for Tools in Machining Processes | 10.1007/s11665-011-9847-x |
2011-07-01 | Dampness is a common condition in old buildings and, accordingly, many paint systems specific for this type of building allow for application on walls with nonnegligible moisture content. In spite of that, performance evaluation of these paints is normally carried out using dry substrates or even on free paint films. T... | Coatings applied on damp building substrates: performance and influence on moisture transport | 10.1007/s11998-010-9319-5 |
2011-07-01 | A series of polyurethane (PU) samples based on poly(tetramethylene glycol)/epoxy resin (EP) graft interpenetrating polymer networks (IPNs) were prepared and their damping, thermal, and mechanical properties were systematically studied in terms of composition and the value of the PU isocyanate index ( R ). The damping p... | Damping, thermal, and mechanical properties of polyurethane based on poly(tetramethylene glycol)/epoxy interpenetrating polymer networks: effects of composition and isocyanate index | 10.1007/s00339-010-6153-7 |
2011-06-01 | The plasmonic spectra of solution phase ensembles of triangular silver nanoplates have been analysed in order to examine the fundamental properties underlying their size-dependent enhanced refractive index sensitivities. Linewidth studies highlight variations in the response of these solution phase nanostructures to th... | Scaling of Surface Plasmon Resonances in Triangular Silver Nanoplate Sols for Enhanced Refractive Index Sensing | 10.1007/s11468-011-9211-x |
2011-06-01 | Although all known materials have internal damping that leads to energy dissipation, most existing large deformation visco-elastic finite element formulations are based on linear constitutive models or on nonlinear constitutive models that can be used in the framework of an incremental co-rotational finite element solu... | A nonlinear visco-elastic constitutive model for large rotation finite element formulations | 10.1007/s11044-011-9244-0 |
2011-06-01 | Reduction of the vibration noise from submarine propellers is of interest in naval operations. Such an objective can be achieved via the use of materials with the ability to dissipate energy of vibration by means of heat, i.e. high damping materials. An additional problem is that the extreme hydrostatic pressure enviro... | Improvement of viscoelastic damping in nickel aluminum bronze by indium-tin | 10.1007/s12540-011-0619-9 |
2011-06-01 | We report on a new design for an ILC 3.2 km damping ring, with 2 arcs based on the FODO cell and 2 straight sections that are nearly the same as the newest version of the 6.4 km ring DCO4. This new lattice requires fewer magnets and a lower RF voltage, and has a better dynamic aperture than DCO4 while maintaining flexi... | ILC 3.2 km damping ring design based on the FODO cell | 10.1007/s11434-011-4483-2 |
2011-06-01 | Based on the principles of electrical conduction and transformation, a model was put forward for the electrical conversion of piezoelectric damping composites, and a related formula was derived. The results show that the best effect of conversion can be achieved by reducing the imaginary part of the impedance and match... | Theoretical analysis of the conversion from electrical into thermal energy in piezoelectric-conductive damping composites | 10.1007/BF03325751 |
2011-06-01 | The paper presents a general approach to the paradox of Nicolai and related effects analyzed as a singularity of the stability boundary. We study potential systems with arbitrary degrees of freedom and two coincident eigenfrequencies disturbed by small non-conservative positional and damping forces. The instability reg... | Paradox of Nicolai and related effects | 10.1007/s00033-011-0127-2 |
2011-06-01 | The specific features of the influence of such factors as the damping of a longitudinal wave in a medium, its transformation into a transverse wave during transmission, and the radiation directivity of array elements on the characteristics of a signal of a normal linear phased-array transducer are considered. Very simp... | On the influence of certain factors on the characteristics of a signal from a normal linear phased-array transducer in the transmission mode | 10.1134/S1061830911060052 |
2011-06-01 | The efficiency of an acceleration-feedback controlled frictional electromagnetic damper is proved. An oscillator with a controlled damper is modeled by three ordinary differential equations of the first order with discontinuous right-hand side. An oscillator with acceleration-dependent energy dissipation is described b... | Modeling a vibrating mechanical system with an acceleration-feedback controlled frictional electromagnetic damper | 10.1007/s10778-011-0447-0 |
2011-05-01 | In this paper, the behaviour of a real geogrids reinforced embankment will be analysed based on the results of numeric modelling in seismic conditions. The reinforced slope is analysed using commercial software based on the finite differences method. After the program presentation, is described the methodology of analy... | Role of the Damping Ratio of Reinforcement on the Behaviour of Geogrids-Reinforced Systems | 10.1007/s10706-010-9383-8 |
2011-05-01 | Oscillators with a non-negative real-power restoring force and quadratic damping are considered in this paper. The equation of motion is transformed into a linear first-order differential equation for the kinetic energy. The expressions for the energy-displacement function are derived as well as the closed form exact s... | Study of oscillators with a non-negative real-power restoring force and quadratic damping | 10.1007/s11071-010-9861-9 |
2011-05-01 | It is known that the reduction in the finite element space discretization error for elastodynamics problems is related to the reduction in numerical dispersion of finite elements. In the paper, we extend the modified integration rule technique for the mass and stiffness matrices to the dispersion reduction of linear fi... | Accurate finite element modeling of linear elastodynamics problems with the reduced dispersion error | 10.1007/s00466-010-0564-3 |
2011-05-01 | Here, we review the angular vestibulocollic reflex (VCR) focusing on its function during unexpected and voluntary head movements. Theoretically, the VCR could (1) stabilize the head in space during body movements and/or (2) dampen head oscillations that could occur as a result of the head’s underdamped mechanics. The r... | Vestibular control of the head: possible functions of the vestibulocollic reflex | 10.1007/s00221-011-2611-5 |
2011-05-01 | Using a flexible support is an efficient approach to solving the subsynchronous problems in a turbopump. In this paper, nonlinear rotordynamic analysis of a liquid fuel turbopump with a flexible support is presented using a dynamic modeling including two key destabilizing factors, nonlinear hydrodynamic forces induced ... | Effects of flexible support stiffness on the nonlinear dynamic characteristics and stability of a turbopump rotor system | 10.1007/s11071-010-9858-4 |
2011-05-01 | Kagome based high authority shape morphing structure is a kind of truss-cored sandwich metal plate with a planar Kagome truss as one of its face plane. The planar Kagome truss can achieve arbitrary in-plane nodal displacements with minimal internal resistance when its rods are deformed. Moreover, the in-plane deflectio... | Passive vibration control of truss-cored sandwich plate with planar Kagome truss as one face plane | 10.1007/s11431-011-4354-8 |
2011-04-01 | Soluble vapor-gas bubbles performing small radial oscillations in a liquid are considered. The heat- and mass-transfer processes and temperature and concentration inhomogeneities in the vaporgas mixture are taken into account. Expressions for the damping rate of radial oscillations of soluble vapor-gas bubbles are obta... | Radial oscillations of soluble vapor-gas bubbles in a liquid | 10.1134/S0015462811020116 |
2011-04-01 | In the context of virtual development processes of mechatronic systems like machine tools, the preventive assessment of the effects of lightweight structural components on the characteristics of controlled feed systems and therefore on the power and energy requirement of machine tools is of great importance. The modeli... | State space modeling of non-proportional passive damping in machine tools | 10.1007/s00170-010-2902-1 |
2011-04-01 | Full waveform inversion (FWI) directly minimizes errors between synthetic and observed data. For the surface acquisition geometry, reflections generated from deep reflectors are sensitive to overburden structure, so it is reasonable to update the macro velocity model in a top-to-bottom manner. For models dominated by h... | Layer-stripping full waveform inversion with damped seismic reflection data | 10.1007/s12583-011-0177-6 |
2011-04-01 | Spacecrafts free of all but gravitational forces are important in precision navigation, gravity field measurement and basic scientific research. The Inner-formation Flying System, one kind of spacecrafts free of all but gravitational forces, is used for gravitational field measurement with high precision. Restraining t... | Coupled modeling and analysis of radiometer effect and residual gas damping on proof mass in purely gravitational orbit | 10.1007/s11431-011-4291-6 |
2011-04-01 | Free vibration characteristics of circular cylindrical shell with passive constrained layer damping (PCLD) are presented. Wave propagation approach rather than finite element method, transfer matrix method, and Rayleigh-Ritz method is used to solve the problem of vibration of PCLD circular cylindrical shell under a sim... | Free vibration of circular cylindrical shell with constrained layer damping | 10.1007/s10483-011-1433-7 |
2011-04-01 | We consider three dimensional finite element computations of thermoelastic damping ratios of arbitrary bodies using Zener’s approach. In our small-damping formulation, unlike existing fully coupled formulations, the calculation is split into three smaller parts. Of these, the first sub-calculation involves routine unda... | Decoupled three-dimensional finite element computation of thermoelastic damping using Zener’s approximation | 10.1007/s11012-010-9318-8 |
2011-04-01 | In this study, we theoretically investigate the dynamic indentation for measuring the loss (damping) factor of a linear viscoelastic material from its indentation response. A rigid indenter with arbitrary tip profile is assumed to indent into a viscoelastic substrate with arbitrary shape. We perform a theoretical analy... | On determination of the damping factor of linear viscoelastic materials using dynamic indentation: a theoretical study | 10.1007/s11433-011-4279-z |
2011-04-01 | A neuron proportion integration (PI) control strategy for semi-active suspension system of tracked vehicle was proposed based on its unique structure and the multiple and complex environment of the driving traffic. An adaptive genetic algorithm is used to optimize the parameters of the neuron PI controller. The simulat... | Neuron PI control for semi-active suspension system of tracked vehicle | 10.1007/s11771-011-0716-4 |
2011-04-01 | This paper presents a design theory and dynamic mechanical characterizations of the composite tape-spring hinge made by two parallel single tape springs. First, the theoretical models of moment-rotation angle on anisotropy tape springs with antisymmetric laminates are proposed. Second, the relationships of moment-rotat... | Design theory and dynamic mechanical characterization of the deployable composite tube hinge | 10.1007/s11433-011-4286-0 |
2011-04-01 | The general algorithm of calculations for oscillating-cup viscometry of fluids with viscous, elastic and plastic components is developed for damped and forced modes. The working equations efficient for practical applications are presented and related problems of data processing are analyzed. The case of forced oscillat... | Nonlinear oscillating-cup viscometry | 10.1007/s00397-010-0517-y |
2011-03-01 | Damping of the loose spring skirt (LSS) of a vibrating pipe under operating conditions was studied experimentally and numerically. Motion images made using a high speed charge-coupled device (CCD) camera as well as acceleration signals were analyzed in order to correlate the physical states of the LSS pipe system with ... | Study of the Damping Mechanisms of Loose Spring Skirts on Vibrating Pipes | 10.1007/s11340-010-9361-3 |
2011-03-01 | A general and comprehensive analysis on the continuous contact force models for soft materials in multibody dynamics is presented throughout this work. The force models are developed based on the foundation of the Hertz law together with a hysteresis damping parameter that accounts for the energy dissipation during the... | On the continuous contact force models for soft materials in multibody dynamics | 10.1007/s11044-010-9237-4 |
2011-03-01 | In this paper, a decrease of turbulent pulsations of velocity in a boundary layer and the coefficient of friction drag for an accelerating flow on the perforated surface with blind damping cavities is experimentally found. We generalize the mathematical model of partial boundary layer laminarization [1], which is based... | Laminarization of a boundary layer on the perforated surface with blind damping cavities in an accelerating flow | 10.3103/S1068799811010107 |
2011-03-01 | The huge piles of overburden comprising of fragmented rocks and loose soil are dumped within the leasehold area causing serious environmental problems in view of occasional sliding and the risks of miner’s life. The continuum-based numerical approach ignores the discrete nature of the geo-materials found in external ov... | Earthquake response of external mine overburden dumps: a micromechanical approach | 10.1007/s11069-010-9602-x |
2011-03-01 | This paper addresses the analysis of active constrained layer damping (ACLD) of geometrically nonlinear transient vibrations of laminated thin composite cylindrical shallow shells using vertically reinforced 1-3 piezoelectric composite (PZC). The constraining layer of the ACLD treatment is considered to be made of this... | Active damping of geometrically nonlinear vibrations of laminated composite shallow shells using vertically/obliquely reinforced 1-3 piezoelectric composites | 10.1007/s10999-010-9147-x |
2011-03-01 | The coupled problem of the forced axisymmetric vibrations and self-heating of electrothermoviscoelastic cylindrical shells with piezoceramic actuators under monoharmonic electromechanical loading is solved. The temperature dependence of the complex characteristics of the passive and piezoactive materials is taken into ... | Forced axisymmetric vibrations and self-heating of thermoviscoelastic cylindrical shells with piezoelectric actuators | 10.1007/s10778-011-0405-x |
2011-03-01 | Eucommia ulmoides gum (EU gum), known as gutta percha in Southeast Asia, is a natural polymer with double characteristics of rubber and plastic. In present paper, tan δ - T curve and hysteresis loss (HL) were chosen to characterize its damping property. The results indicated that its tan δ value would increase with ris... | Damping performance of Eucommia ulmoides gum | 10.1007/s10118-010-1008-4 |
2011-02-01 | This paper describes the non-linear identification of a progressively damaged reinforced concrete beam-column node. The aims are the detection and identification of the different sources of damping and their dependence from the damage level. To this end a specially formulated non-linear identification method is propose... | Non-linear Damping and Frequency Identification in a Progressively Damaged R.C. Element | 10.1007/s11340-010-9360-4 |
2011-02-01 | Globally positive solutions for the third order differential equation with the damping term and delay, $$ x''' + q(t)x'(t) - r(t)f(x(\phi (t))) = 0, $$ are studied in the case where the corresponding second order differential equation $$ y'' + q(t)y = 0 $$ is oscillatory. Necessary and sufficient conditions for all non... | Unbounded solutions of third order delayed differential equations with damping term | 10.2478/s11533-010-0088-2 |
2011-02-01 | A nonlinear mathematical model of a system of n rigid bodies undergoing translational vibrations under inertial loading is constructed. The system includes ball supports as a seismic-isolation mechanism and electromagnetic dampers controlled via an inertial feedback channel. A system of differential dynamic equations i... | Nonlinear dynamics of a system of rigid bodies with controlled electromagnetic dampers | 10.1007/s10778-011-0399-4 |
2011-02-01 | We consider two mathematical models that describe the vibrations of spring-mass-damper systems with contact and friction. In the first model, both the contact and frictional boundary conditions are described with subdifferentials of nonconvex functions. In the second model, the contact is modeled with a Lipschitz conti... | Analysis of lumped models with contact and friction | 10.1007/s00033-010-0081-4 |
2011-02-01 | Friction-induced vibration is an important phenomenon with adverse effects on many dynamic systems involving friction. In this study, a very simple and well-known one-dimensional friction-induced dynamic system is considered in which the novel PZT stack impulse damper is incorporated into the system. It has been shown ... | Application of impulse damper in control of a chaotic friction-induced vibration | 10.1007/s12206-010-1116-7 |
2011-01-01 | This work is concerned with ( n -component) hyperbolic systems of balance laws in m space dimensions. First, we consider linear systems with constant coefficients and analyze the possible behavior of solutions as t → ∞. Using the Fourier transform, we examine the role that control theoretical tools, such as the classic... | Large Time Asymptotics for Partially Dissipative Hyperbolic Systems | 10.1007/s00205-010-0321-y |
2011-01-01 | In this chapter we return to our study of non-adiabatic effects on the forces in collision cascades. In this case we examine the behaviour of the non-adiabatic force on the moving ions. Various attempts have been made to capture the effects of such forces in classical MD simulations by adding a drag force to the ionic ... | The Electronic Drag Force | 10.1007/978-3-642-15439-3_11 |
2011-01-01 | This chapter presents an assortment of material, covered in varying degrees of detail, which is needed as background material for the rest of this book. Students with a strong background in mathematics can probably skim some of the sections in this chapter. Section 1.1 discusses why differential equations are important... | Introduction and Preliminaries | 10.1007/978-1-4419-7919-3_1 |
2011-01-01 | The paper deals with influence of dry friction damping on bladed disk vibration. Firstly the 3D FE solution and analysis of the imperfect blade disk dynamics is presented. Then the dry friction effect is studied analytically on linearized spring-dry-friction model consisting of equivalent linear stiffness and damping c... | Influence of Dry Friction Damping on Bladed Disk Vibration | 10.1007/978-94-007-2069-5_75 |
2011-01-01 | Many forms of actuators have been developed with the capability of braking. Most of these braking mechanisms involve numerous mechanical components, that wear with time and lose precision, furthermore the mechanism are difficult to scale down in size while maintaining relatively large holding torques. In this paper, we... | Design and Control of a Novel Visco-elastic Braking Mechanism Using HMA | 10.1007/978-3-642-25486-4_42 |
2011-01-01 | This chapter is devoted to studying the problems associated with second-order differential equations with an unbounded operator coefficient A in a Banach space. In Section 4.1, we consider these equations with an unbounded operator in either Banach or Hilbert spaces depending on the parameter t. We propose a discretiza... | The second-order equations | 10.1007/978-3-0348-0119-5_4 |
2011-01-01 | Due to the gyro random walk and other reasons, Schuler oscillation amplitude of undamped inertial navigation system will increase with time. The marine inertial navigation systems were often required to work continuously for hours to days or even longer, over divergent INS position error will cause loss of navigation f... | Research on Internal Damping Algorithm of Marine Inertial Navigation System | 10.1007/978-3-642-18134-4_41 |
2011-01-01 | The article deals with measurement and evaluation of damping properties of polyurethane (PU) foam. This problem is considered from the point of view of vibroinsulation and dynamical comfort of person sitting in a moving car. The force response to dynamical compression of PU foam specimen by harmonical course of displac... | Modelling of Damping Force of Polyurethane Foam in Dependence on Its Temperature | 10.1007/978-94-007-2069-5_89 |
2011-01-01 | We define horizontal diffusion in C ^1 path space over a Riemannian manifold and prove its existence. If the metric on the manifold is developing under the forward Ricci flow, horizontal diffusion along Brownian motion turns out to be length preserving. As application, we prove contraction properties in the Monge–Kanto... | Horizontal Diffusion in C
^1 Path Space | 10.1007/978-3-642-15217-7_2 |
2011-01-01 | A new semiactive coupling element working on the principle ofsqueezing two concentric films formed by classical and magnetorheological liquids has been proposed to achieve the optimum attenuation of the lateral vibration of rotors. The damping effect is controlled by changing the magnetic field induction. The steady st... | Stability Investigation of the Steady State Response of Flexibly Supported Rigid Rotors | 10.1007/978-94-007-2069-5_70 |
2011-01-01 | Uniform stability of Reissner-Mindlin-Timoshenko (RMT) plates is addressed. Similarly to waves, Kirchhoff plates, and elastodynamics, boundary stabilization of the RMT model relies on an observability inequality, which in turn necessitates the derivation of certain trace regularity estimates. The exponential stability ... | On Stability and Trace Regularity of Solutions to Reissner-Mindlin-Timoshenko Equations | 10.1007/978-3-0348-0069-3_5 |
2011-01-01 | Excessive vibration of machines and/or structures can be controlled passively (e.g. introducing resilient elements) and/or actively (e.g. using elements capable to adjust their properties for actual state of the vibration). An electromagnet, as a vibration control element, can be implemented in active (or semi-active) ... | An Application of Electromagnetic Induction in Vibration Control | 10.1007/978-94-007-2069-5_61 |
2011-01-01 | This study investigates the effect of damping in an input device on performance in a target acquisition task. In an experiment with 21 participants, five levels of damping were tested in the range of 0 to 10 Ns/m. Contrary to our expectation, the time required to acquire a target decreased as the damping value increase... | The Effect of Damping in an Input Device on Human Positioning Performance | 10.1007/978-3-642-22095-1_67 |
2011-01-01 | We have found an analytical expression describing the evolution of a two-level system in a strong resonant quantum field beyond the rotating wave approximation. The solution obtained has allowed us for the first time to identify the qualitative features of the behavior of the system in this case: suppression of the "co... | Transformation of a Rabi oscillation spectrum for a two-level system in a strong resonant field | 10.1007/s10812-011-9410-4 |
2011-01-01 | The topic of how a solution to a problem in continuum mechanics decays in space, including those equations which involve second sound, has been one of immense interest over the last few years. The first articles to deal with spatial decay in thermoelasticity would appear to be those of (Chirita, 1995a; Chirita, 1995b),... | Spatial decay | 10.1007/978-1-4614-0493-4_7 |
2011-01-01 | The dynamic mechanical properties of compacted samples of synthetic calcium silicate hydrate (C–S–H) were determined at variable stoichiometries (C/S ratio). The stiffness and damping properties of the C–S–H systems were monitored at various increments of mass loss from 11%RH following the removal of the adsorbed and i... | Mechanical properties of calcium silicate hydrates | 10.1617/s11527-010-9605-9 |
2024-03-01 | With low liquidus temperatures, low raw material costs, and non-toxicity, Sn-Bi low-temperature solders are promising candidates for the replacement of the currently widely-used lead-free solders in situations in which process temperatures have to be reduced. Electrical resistivity is one of the most important properti... | The Effect of Temperature on the Electrical Resistivity of Sn-Bi Alloys | 10.1007/s11664-023-10849-1 |
2024-03-01 | Gasification is widely regarded as one of the most practical, economical, and environmentally friendly waste disposal technologies for municipal solid waste (MSW). The pyrolysis stage (300–500 °C) is crucial for weight loss during MSW gasification, as a considerable amount of organic matter breaks down, producing high-... | Distribution of gasification products and emission of heavy metals and dioxins from municipal solid waste at the low temperature pyrolysis stage | 10.1007/s11356-024-32284-3 |
2024-03-01 | The potential of Sn-Bi alloys as low-temperature solders for electronics manufacturing has spurred significant research on their mechanical properties, both in the as-soldered condition and after aging. Previous studies have demonstrated that, because of the extreme temperature sensitivity of the solubility of Bi in Sn... | Investigating the Effects of Rapid Precipitation of Bi in Sn on the Shear Strength of BGA Sn-Bi Alloys | 10.1007/s11664-023-10850-8 |
2024-03-01 | The change in the electrical resistance of a SnBi-based solder joint during current stressing has been measured. For early times, a distinct, non-linear signal was observed and correlated with the initial formation of a continuous Bi layer via a lateral growth mechanism. For later times, a linear increase in the electr... | Changes in the Microstructure and Electrical Resistance of SnBi-Based Solder Joints during Current Stressing | 10.1007/s11664-023-10875-z |
2024-03-01 | Hot-swaging yields a high ultimate tensile strength of 712 MPa but a limited tensile ductility with the total elongation of 3.6% at a testing temperature of 200 °C in a representative W-0.5wt.%ZrC alloy. In this work, the evolution of Vickers micro-hardness with annealing temperatures is investigated in detail, which c... | Achieving a remarkable low-temperature tensile ductility in a high-strength tungsten alloy | 10.1007/s42864-023-00218-0 |
2024-03-01 | Strengthening low-chromium iron-based alloys with multiple alloy elements is a crucial strategy for developing “casing-friendly” hardbanding materials. In this paper, four kinds of low-chromium iron-based hardfacing alloys with different Ti contents were prepared by flux-cored arc welding technology, and the effect of ... | Microstructure and wear resistance of in situ TiC-reinforced low-chromium iron-based hardfacing alloys | 10.1007/s40194-023-01657-6 |
2024-03-01 | In this study, a high temperature in-situ route is reported for the synthesis of one dimensional carbon nitride supported bismuth sulfide nanoparticles. The x-ray diffraction study confirmed the formation of orthorhombic crystal structure of bismuth sulfide with the space group of Pnma (62). The synthesized product was... | Carbon Nitride Supported Ultra-fine Bismuth Sulfide Based Supercapacitor for Low Frequency Oscillator Application | 10.1007/s11664-023-10901-0 |
2024-03-01 | Titanium aluminide (TiAl) has been identified as a key material for achieving significant emission reductions in aircraft jet engines due to its high-temperature properties combined with its very low weight compared with conventional nickel-based alloys. Well-known engine manufacturers, therefore, introduced TiAl low-p... | Resource-Efficient Manufacturing Technology for Titanium Aluminide Aerospace Components | 10.1007/s41403-023-00436-5 |
2024-03-01 | API 5L Grade X65 steel pipes, internally clad alloy 625, are commonly utilized in pipelines and risers for subsea oil and gas extraction. Gird welds in such pipes are conventionally made using alloy 625 filler metal. However, alloy 625 weld metal cannot meet the base metal yield strength overmatching requirement for su... | Low alloy steel girth welds in X65 steel pipes internally clad with alloy 625 | 10.1007/s40194-023-01661-w |
2024-03-01 | De-oiled rice bran is a good source of high-quality protein; however, the current practice of desolventization at high temperature (110–120 °C) denatures the protein, making its extraction difficult and uneconomical. The present study aims to investigate the effect of low temperature desolventization of de-oiled rice b... | Low temperature desolventization: effect on physico-chemical, functional and structural properties of rice bran protein | 10.1007/s13197-023-05859-0 |
2024-03-01 | Low-melting-point Sn-Bi solder joints (melting point: 139°C) show remarkable resistance to damage accumulation during aggressive thermal cycling. In this study, we used isothermal aging at 85°C of near eutectic Sn-Bi solder joints to determine the effect of Sb in solid solution and Ag 3 Sn intermetallic on microstructu... | Effect of Sb and Ag Addition and Aging on the Microstructural Evolution, IMC Layer Growth, and Mechanical Properties of Near-Eutectic Sn-Bi Alloys | 10.1007/s11664-023-10866-0 |
2024-03-01 | Low nitrogen use efficiency (NUE) in corn production leads to reduced harvest and substantial nitrogen (N) losses, adversely impacting environment and agricultural sustainability goals. Controlled release of N fertilizers can improve NUE by controlling the release of N from fertilizer granules, extending N availability... | Greenhouse Evaluation of Biochar-Based Controlled-Release Nitrogen Fertilizer in Corn Production | 10.1007/s40003-023-00673-8 |
2024-03-01 | To investigate a highly active catalyst for CER and explore low concentrations of Cl − electrocatalytic product Cl 2 , Co 3 O 4 /GF catalysts were constructed by a methanesulfonic acid system plating and calcination process. SEM shows Co 3 O 4 /GF-0.1 has a uniform distribution of nanoparticles. TEM, XRD, and XPS resul... | 3D-Graphite Felt Self-loaded Rich Co3O4 Nanoparticle Electrodes for Chlorine Evolution Reaction at Low Concentration Chloride Ion | 10.1007/s10562-023-04338-7 |
2024-03-01 | Single-crystal silicon, a typical hard and brittle material, is widely used in various fields due to its exceptional material properties. However, grinding of silicon is facing great challenges such as surface and subsurface damages due to the hardness and brittleness of the material. To increase the grinding force rat... | Study on high-shear and low-pressure grinding using a new BAAT with soft-hard combined substrate for single-crystal silicon | 10.1007/s00170-024-13141-6 |
2024-03-01 | The resource utilization of agricultural and forestry waste, especially the high-value transformation of low-grade phosphate rock and derivatives, is an important way to achieve sustainable development. This study focuses on the impregnation and co-pyrolysis of rice straw (RS) with fused calcium magnesium phosphate (FM... | Adsorption effect and mechanism of Cd(II) by different phosphorus-enriched biochars | 10.1007/s11356-024-32308-y |
2024-03-01 | Indoor air pollution is an environmental health challenge in Kenya, particularly in rural households, and low-income urban areas. This review aims to provide an overview of the sources, health effects and mitigation strategies for indoor air pollutants in Kenya. The main goal of our study was to review existing literat... | Indoor Air Pollution in Kenya | 10.1007/s41810-023-00205-5 |
2024-03-01 | Environmental DNA (eDNA) surveys have gained popularity as a highly sensitive detection tool that generally outperform traditional detection techniques. eDNA surveys can provide a cost-effective means to identify species’ distributions and recent incursions, informing the control or containment of invasive species. The... | Does mesocosm validation of environmental DNA methods translate to natural environment monitoring applications? A case study detecting a high-profile invader; the red eared slider turtle, Trachemys scripta elegans, in Australia | 10.1007/s12686-023-01333-3 |
2024-03-01 | The theoretical modelling of electrostatic lower hybrid waves (LHWs) is investigated using a kinetic treatment involving an electron beam. This electron beam propagates through a magnetized dusty plasma cylinder that consists of dust grains, electrons, and positively charged potassium ions ( K +). The excitation of LH... | Kinetic treatment of lower hybrid waves excitation in a magnetized dusty plasma by electron beam | 10.1007/s12648-023-02865-y |
2024-03-01 | Hydrogen sulfide (H 2 S) is a significant physiologic inhibitory neurotransmitter. The main goal of this research was to examine the contribution of diverse potassium (K + ) channels and nitric oxide (NO) in mediating the H 2 S effect on electrical field stimulation (EFS)-induced neurogenic contractile responses in the... | Effects of hydrogen sulfide on relaxation responses in the lower esophageal sphincter in rabbits: the potential role of potassium channels | 10.1007/s00210-023-02695-z |
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