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201
Experimental study on the mechanical properties of modified phosphogypsum at different loading rates
Published 2024-12-01“…As the loading rate increases, the crack initiation stress $${\sigma _{{\text{ci}}}}$$ , damage stress $${\sigma _{{\text{cd}}}}$$ , and peak strength $${\sigma _f}$$ gradually increase, but the increasing amplitude gradually decreases. Under quasi-static loading at 0.12 to 0.6 mm/min, $${\sigma _{{\text{ci}}}}{\text{/}}{\sigma _f}$$ and $${\sigma _{{\text{cd}}}}{\text{/}}{\sigma _f}$$ show no significant changes and remain at 0.52 and 0.81, respectively, close to the values of rock materials. …”
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202
Experimental Study of Dynamic Mechanics Characteristics of Saturated Marble under Low Temperature
Published 2021-01-01“…From −5°C to −20°C, the ice medium and marble matrix contract when cooled, and the microcracks and micropores caused by the phase transition gradually close during the contraction process, the integrity of the rock is restored, and the dynamic strength of the rock is increased. …”
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203
A Coupled Gas Flow-Mechanical Damage Model and Its Numerical Simulations on High Energy Gas Fracturing
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204
An Empirical Study of the Features of Coordination Functions in Hearing-Impaired Children of Primary School Age
Published 2024-05-01“…According to this theory, there are five levels of the movement construction system: the level of static coordination (A), the level of dynamic coordination (B), the level of spatial coordination (C), the level of object coordination (D) and the level of symbolic coordination (E). 60 respondents took part in the study. 30 hearing-impaired primary schoolchildren (7–11 years old) with sensorineural hearing loss (13 girls and 17 boys) were included in the experimental group, and 30 primary schoolchildren (7–11 years old) without hearing impairment formed the control group (16 girls and 14 boys). …”
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205
Prediction and Analysis of Bending Fatigue Crack Growth Behavior of Spur Gear
Published 2016-01-01“…Based on the involute cylindrical gear as research object,the initial premise of the existence of cracks on the tooth root,the root of the fatigue crack growth characteristics and life are studied. …”
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206
Investigation of vibration protection system of a seat with quasi-zero stiffness under stochastic effects on the elements of running equipment of a motor grader
Published 2023-03-01“…The variable parameters are the root mean square deviation of the vertical coordinates of the microprofile of the supporting surface, the speed of motion of the motor grader, the size of the zone of quasi-zero stiffness of the vibration protection mechanism of the operator's seat, the value of the increase in the spring stiffness coefficient of the vibration protection mechanism, which sets the slope of the average section of the static power characteristic of the vibration protection mechanism. …”
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207
Dynamic Behavior of Fault Slip Induced by Stress Waves
Published 2016-01-01“…Fault slip burst is a serious dynamic hazard in coal mining. A static and dynamic analysis for fault slip was performed to assess the risk of rock burst. …”
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208
Generalization of stochastic mortality models to improve mortality prediction in life insurance and pension funds
Published 2023-09-01“…After estimating the parameters of the studied models and calculating the prediction of the mortality rates, by calculating the mean absolute error and root mean squares error of prediction, it is determined that the generalization of stochastic mortality models by the CIR process performs much better than static mortality models. …”
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209
STUDIED ON DYNAMIC STRESS RESPONSE OF 20CrMnTi STEEL UNDER IMPACT LOAD AND CONSIDERED FOR ADIABATIC TEMPERATURE RISE MODIFICATION OF THE J-C CONSTITUTIVE MODEL
Published 2019-01-01“…In this paper, the quasi-static tensile tests and the dynamic compression tests of 20 CrMnTi were carried out using the tensile tester and Split Hopkinson pressure bar（SHPB） device at different strain rate to study the dynamic stress response of 20 CrMnTi steel. …”
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210
Gust Load Alleviation including Geometric Nonlinearities Based on Dynamic Linearization of Structural ROM
Published 2019-01-01“…A state-space equation is established in a dynamic linearized system around the prescribed static equilibrium state after nonlinear static aeroelastic analysis. …”
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211
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212
The Use of MSK Ultrasound in the Evaluation of Elbow Ulnar Collateral Ligament Injuries
Published 2023-04-01“…Musculoskeletal ultrasound (MSK-US) is one tool that has revolutionized the way physical therapists evaluate musculoskeletal pathology. …”
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213
Uncertainty, fragility, resilience
Published 2019-12-01“…In this perspective, the strategy that pretends to maintain static equilibrium at any cost is ineffective. Therefore, we look with attention at the adaptive approach, based on reactivity, ability to self-repair individual parts and fault tolerance, which has always enabled living organisms to survive in hostile contexts. …”
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214
Experimental Analysis on Compression Characteristics of Improved Phyllite Filler
Published 2021-01-01“…Soil compression is an important characteristic that affect the construction and operation of improved soft rock filling in mountainous ports.Through adding 5% cement to improve the weakly weathered phyllite filler,setting 4 kinds of rolling loads and 5 cycles of loading and unloading,and using an improved high-pressure lever consolidation instrument,this paper measures the soil strain,compaction and porosity ratio under different stress states,and specifies the change law of compression modulus and resilience modulus during loading and unloading process.The test results shows that:The deformation of the modified phyllite filler mainly occurs in the first loading process,and it increases significantly with the increase of the rolling load.The porosity ratio curve shows a concave shape with the increased cycles of loading and unloading.When the rolling load is 100 kPa,the curve of porosity ratio is nonlinear with the increased cycles of loading and unloading;when the rolling load is 200 kPa,the compression of the soil changes from medium to low with the increase of compaction cycles.At this time,the modulus of resilience takes a minimum value.It is suggested that the 200 kPa roller compaction stress should be used as the first static compaction during the construction of improved soft rock filling in mountainous ports,which should be increased appropriately in the subsequent construction.…”
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215
Experimental Study on Acoustic Emission and Resistivity Response of Sandstone under Constant Amplitude Cyclic Loading
Published 2021-01-01“…A lot of engineering practice shows that, during the construction and operation of rock mass projects, in addition to the static load, the rock is more subjected to cyclic load. …”
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216
Physics for Scientists and Engineers with Modern physics /
Published 2008Table of Contents: “…Introduction, measurement, estimating -- Mechanics -- Describing motion -- Kinematics in two or three dimensions -- Dynamics -- Using Newton's laws -- Gravitation and Newton's synthesis -- Work and energy -- Conservation of energy -- Linear momentum -- Rotational motion -- Angular momentum -- Static equilibrium -- Fluids, vibrations, waves, sound -- Fluids -- Oscillations -- Wave motion -- Sound -- Kinetic theory and thermodynamics -- Temperature, thermal expansion, and the ideal gas law -- Kinetic theory of gases -- Heat and the first law of thermodynamics -- Second law of thermodynamics -- Electricity and magnetism -- Electric charge and electric field -- Gauss's law -- Electric potential -- Capacitance, dielectrics, electric energy storage -- Electric currents and resistance -- DC circuits -- Magnetism -- Sources of magnetic field -- Electromagnetic induction and faraday's Law -- Inductance, electromagnetic oscillations -- Maxwell's equations and electromagnetic waves -- Light -- Lenses and optical instruments -- The wave nature of light -- Diffraction and polarization -- Modern physics -- Special theory of relativity -- Early quantum theory and models of the atom -- Quantum mechanics -- Quantum mechanics of atoms -- Molecules and solids -- Nuclear physics and radioactivity -- Nuclear energy -- Elementary particles -- Astrophysics and cosmology.…”
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217
Response of Balanced Laminate Subjected to Abrupt Heat Flux: A New Perspective
Published 2022-01-01“…Through the investigation, the maximum static deformation and the dynamic amplitude are illustrated for different ply arrangements. …”
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218
Reduction in Carbon Dioxide Emission and Energy Saving Obtained by Renovation of Building Envelope of Existing Residential Buildings
Published 2021-06-01“…Finally, we identified the optimal combination for conserving energy and decreasing CO2 emissions as 120-mm-thick expanded polystyrene insulating board for both the exterior wall and the roof, and 5-mm-thick triple-silver low-emissivity glass and 5-mm-thick normal glass separated by 12 mm of air for the exterior windows, which resulted in a cooling capacity, heating consumption, total building energy consumption, static payback period, and dynamic payback period of 28.37 kWh m−2 a−1, 4.22 kWh m−2 a−1, 32.59 kWh m−2 a−1, 13.76 years, and 22.84 years, respectively, as well as an annual reduction in CO2, sulfur dioxide (SO2), and nitrogen oxides (NOx) emissions of 86.01 tons, 2.59 tons, and 1.29 tons, respectively.…”
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219
MODIFICATION OF DYNAMIC CONSTITUTIVE RELATION OF440C STAINLESS STEEL BASED ON J-C MODEL (MT)
Published 2023-01-01“…In order to construct a constitutive model that reasonably describes the changing relationship of flow stress of 440C stainless steel, quasi-static and dynamic compression experiments were carried out with the help of a universal testing machine and a Hopkinson compression bar device. …”
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220
The Loading Rate Effect on the Fracture Toughness of Marble Using Semicircular Bend Specimens
Published 2020-01-01“…To describe the variation in DIFf from low to high loading rates, a new continuous model of DIFf was put forward to express the quantitative relation between the loading rate and rock dynamic fracture toughness. It is shown that the new DIFf model can accurately describe the loading rate effect on the dynamic fracture testing data for rock materials.…”
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