Based on describing harmonic vibration with ratation vector,rotation velocity vector and rotation acceleration vector were introduced to describe velocity and acceleration in harmonic vibration.

The flow in the crucible during ACRT process is calculated with SOLA-VOF(a solution algorithm based on the concept of the volume of fluid). The effeCts of the rotation acceleration, the diameter,and the maximum rotation sped as well as its lasting time, of the crucible are studied through numerical calculations. For six groups of ACRT parameters, the evolution of the convection has the same trend .

A general method of calculating pitch angle and roll angle as well as their rotation acceleration of multi-axle motor vehicles is established and the effects of related factors are analyzed specifically in this paper.

Result In 32 Vehicle accidents,there were 17 cases relating to motor accident,there were rotation,acceleration and deceleration,together with three kinds of injures mechanism.

The results show that most of the strong earthquakes (M≥7.0) in Tianshan, Qilian-chaidamu, Qiantang-Lasa, Chuandian block of western China and most of the strong earthquakes (M≥6.0) in Zhongchao-Ludong, east section of Huanan block of Eastern China occurred in the years with the earth rotation acceleration;

Tolerance curves for the brain with respect to translation and rotation acceleration are noted.

This sequence consists of a position reset mode, a rotation acceleration mode, and a rotation speed control mode.

The design of protective equipment for the head is often based on intu-ition because of the lack of reliable information about the mechanical behavior of thehead.In order to properly design devices for minimizing head injury in the projectivecrash environment,engineers require a means for predicting the potential injury model.The objective of this study was to perform experiments on head of animals and fresh ca-davers with sufficient precision so that a validation of the analytical model can be madefor the impact...

The design of protective equipment for the head is often based on intu-ition because of the lack of reliable information about the mechanical behavior of thehead.In order to properly design devices for minimizing head injury in the projectivecrash environment,engineers require a means for predicting the potential injury model.The objective of this study was to perform experiments on head of animals and fresh ca-davers with sufficient precision so that a validation of the analytical model can be madefor the impact situation,and to analyse the mechanisms of head injury in animal testswith pathological and engineering data obtained from the experiments.The neck is sus-ceptible to trauma and is frequently a site of pain.Thus,determination of the magnitudesof neck muscle impact forces and of cervical spine compression and shear forces imposedby the performance of physical tasks are of practical importance.A series of experi-mental results related to the biomechanical properties for 4 cases of severe head neck mus-cle injury in rhesus monkeys were presented.It included muscle contraction intensity,forces and strain,rotation acceleration and so on.A biomechanical model of the neckmuscle was constructed.It was found that the primary types of strain that damage tissuewere tensile strain and shear strain,which produce lacerations,fractures,ruptures oravulsions.When an artery is stretched beyond its tensile strength,the tissue will break.Organs and vessels were stretched in different ways,which result in different types of in-juries.Shear strain occured when opposing forces acted across a tissue.The strain mecha- nism not only explains laceration injuries but was also a principal factor in contusion in-jury.The present results would be helpful in the treatment of injury of the head-neck re-gion and design of its protective equipments.

Volcanic eruption is a severe geologic calamity and an important factor influencing the global climatic changes. At present, the research on trigger factors of volcanic eruption is rather frail. This paper shows that the change of earth rotation speed and the superposition of resonance pressure increase of tide-forming force have modulation and trigger effect on volcanic eruption respectively. During 1883—1982, there mainly were 40 times of the global volcanic eruptions. Their volcanic ash spurted to the stratosphere...

Volcanic eruption is a severe geologic calamity and an important factor influencing the global climatic changes. At present, the research on trigger factors of volcanic eruption is rather frail. This paper shows that the change of earth rotation speed and the superposition of resonance pressure increase of tide-forming force have modulation and trigger effect on volcanic eruption respectively. During 1883—1982, there mainly were 40 times of the global volcanic eruptions. Their volcanic ash spurted to the stratosphere and affected the solar radiation in mid-latitude. Assuming that the distinguish border is 36° latitude, except one is beyond it, of the 23 volcanic eruptions in the low-latitude, 17 occurred during the decelerate period of earth rotation annual mean values, accounting for 73.9%, of the 16 vc canic eruptions in the high-latitude, 10 occurred during the period of the earth rotation acceleration, accounting for 62.5%. Particularly, all major volcanic eruptions conform to this relation. It shows that the changes of the earth rotation speed have modulation effect on the volcanic eruptions in different latitude. After tong period of research, we have found that the lunar effect no the atmosphere movement is strickly decided by the vertical tide-forming force at the moment of astronomical singularity. At this moment, the most remarkable effect areas are: nearby 54.7° of sublunar point at astronomical singularity, 80—90° of sublunar point at astronomical singularity, and ≤±2° at the lunar culmination, corresponding respectively to the resonance area of tide-forming force, the gravitational wave and the stationary wave. This paper has analysed and shown that, 3 major volcanic eruptions in the period of 1957—1982 (March 8, 1963, Agung volcanic eruption; May 18 1980, ST. Helens volcanic eruption; March 28—April 4, 1982, El-Chichon volcanic eruption), all occurred at the meeting of 4 astronomical singularity's superposition of pressure increase of resonance within 3 days. The other 11 volcanic eruptions also met with 2—4 astronomical singularity's superposition of pressure increase of resonance within 3 days. Tested by the astronomical singularity's resonance conditions of the several continuous events of 1980 ST. Helens volcanic eruption and the 1991 Pinatubo major volcanic eruption, the similar conformation to this relation holds. From he above, it may be shown that, within a short period, the superposition of many astronomical singularity's resonance pressures have an important trigger effect on the volcanic eruption. Their physical mechanism may be proposed as that the decrease of the earth rotation would lead to the shortening of the radius of the equator and the contracting of low-latitude lithosphere, making the magma of some volcanos in low-latitude compressed and accumulating the energy for eruption; on the contrary, the increase of the earth rotation would lead to the shortening of the polar radius and the contracting of the high-latitude lithosphere, so accumulating the energy for volcanic eruption in high-latitude. The astronomical singularities superposition of resonance pressure increase within a short period also causes some active volcanic magma to meet a specially continuous compressive force and initiating the volcanic eruption.

The flow in the crucible during ACRT process is calculated with SOLA-VOF(a solution algorithm based on the concept of the volume of fluid).The effeCts of the rotation acceleration, the diameter,and the maximum rotation sped as well as its lasting time, of the crucible are studied through numerical calculations. For six groups of ACRT parameters, the evolution of the convection has the same trend .Among three kinds Of accelerations, 15rpm / s, 30rpm / s, and infinity,the medium one can make the strongest...

The flow in the crucible during ACRT process is calculated with SOLA-VOF(a solution algorithm based on the concept of the volume of fluid).The effeCts of the rotation acceleration, the diameter,and the maximum rotation sped as well as its lasting time, of the crucible are studied through numerical calculations. For six groups of ACRT parameters, the evolution of the convection has the same trend .Among three kinds Of accelerations, 15rpm / s, 30rpm / s, and infinity,the medium one can make the strongest convection of the fluid in the crucible. As the diameter,or the maximum rotation speed, or its lasting time increases, the convection in the crucible will be enhanced .These results are consistent with those of the water simulation experiments by the same authors.