Sound and rapid development is an intrinsic requirement in the implementation of the "scientific outlook on development" and represents an important change in the concept of economic development. This articl...Sound and rapid development is an intrinsic requirement in the implementation of the "scientific outlook on development" and represents an important change in the concept of economic development. This article, reviews past achievements under the guidance of "rapid and sound" development, and brings to light the reasons why we need to pursue "sound and rapid" development and how it can be achieved.展开更多
Generalized equation for linear gravity waves in moving medium has been obtained. Sound wave is considered as a particular case and it is shown that in inhomogeneous medium at rest it is propagated in full concordance...Generalized equation for linear gravity waves in moving medium has been obtained. Sound wave is considered as a particular case and it is shown that in inhomogeneous medium at rest it is propagated in full concordance with the Doppler law and principle of motion relativity, i.e. these laws are invariant with reference to properties of medium (homogeneity or inhomogeneity). In moving medium they are fair only in the case of its homogeneity. In strongly inhomogeneous moving medium, propagation of sound is absolutely impossible.展开更多
In the practice of instituting the system of intellectual property, medicine production is one of the key points concerning people inside and outside China. In the past six years, the medicine industry has undergone r...In the practice of instituting the system of intellectual property, medicine production is one of the key points concerning people inside and outside China. In the past six years, the medicine industry has undergone rapid development in the wake of the market economy. Although some problems cropped up in 1994, a series of laws, policies, regulations and measures has been formulated for strengthening administration. This shows how the protection of intellectual property and the deepening reform of the medicine industry are being enhanced by the Chinese government.展开更多
It is reported that some types of insects have a remarkable ability to detect the direction of an incident sound even though its acoustic sensory organs are in very close proximity each other. Maybe the ears are joint...It is reported that some types of insects have a remarkable ability to detect the direction of an incident sound even though its acoustic sensory organs are in very close proximity each other. Maybe the ears are jointed by a cuticular structure with which the separated motions can be coupled mechanically and thus be magnified. In this paper, a detailed model is setup to describe the principle of this type of localization using a mechanical coupled structure. The transfer functions and the responses of the model in terms of time and frequency are analyzed to describe the mechanism of its ability of directional hearing. This analytical model provides a method to design the experimental model for the predetermined incident sound pressure, and the analysis of this model shows that this structure have the ability to determine the direction of the incident stimulus.展开更多
When you go to Fashion Week,the talk is all about what’s trending in colors,cuts,hemlines,and finishes.When you go to retail seminars,it＇s about data.And how artificial intelligence（AI）,machine learning,
为降低变速箱的振动噪声,提高整车噪声、振动与声振粗糙度(noise vibration harshness,NVH)性能,通过变速箱下线台架(end of line,EOL)振动测试和整车NVH测试,对比分析正常齿廓齿轮、带S形齿廓的齿轮对整车NVH性能的影响。EOL测试结果表...为降低变速箱的振动噪声,提高整车噪声、振动与声振粗糙度(noise vibration harshness,NVH)性能,通过变速箱下线台架(end of line,EOL)振动测试和整车NVH测试,对比分析正常齿廓齿轮、带S形齿廓的齿轮对整车NVH性能的影响。EOL测试结果表明:装配S形齿廓齿轮的变速箱的振动加速度级明显高于正常齿廓齿轮变速箱,尤其在48阶次处增幅最大。整车NVH测试结果表明,S形齿廓齿轮在发动机舱及车内的声压级分别增大12、7 dB。实际加工制造验证结果表明,正确设定齿轮加工珩磨轮寿命可以有效消除齿廓的S形波动,改善变速箱及整车的NVH性能。展开更多
[Objective] The aim was to study the effects of sound waves with different types and frequency characteristics on the growth of cowpea（Vigna unguiculata）during seedling stage.[Method] The insect-music mixed sound（M...[Objective] The aim was to study the effects of sound waves with different types and frequency characteristics on the growth of cowpea（Vigna unguiculata）during seedling stage.[Method] The insect-music mixed sound（MI）,cuckoo acoustic song,cricket acoustic song,single 400 Hz frequency sound wave,F5 and Fn sound waves composed of different frequencies were designed to investigate their effects on height and weight of cowpea seedling,and experimental data were statistically analyzed and multiple-compared by EXCEL.[Result] After treatment by sound waves with six different types and frequencies,the growth situations of cowpea were better than that in control.This indicated that sound waves could significantly promote height growth of plant.The treatments with good growth-promotion effect included 400 Hz frequency sound wave,cuckoo acoustic song and cricket acoustic song,followed by MI,Fn and F5.Cuckoo and cricket acoustic song treatment could promote the weight of cowpea seedling during seedling stage.[Conclusion] Sound waves with different types and frequency characteristics had significant growth-promotion effect on growth of cowpea during seedling stage,but their effects were different.展开更多
文摘Sound and rapid development is an intrinsic requirement in the implementation of the "scientific outlook on development" and represents an important change in the concept of economic development. This article, reviews past achievements under the guidance of "rapid and sound" development, and brings to light the reasons why we need to pursue "sound and rapid" development and how it can be achieved.
文摘Generalized equation for linear gravity waves in moving medium has been obtained. Sound wave is considered as a particular case and it is shown that in inhomogeneous medium at rest it is propagated in full concordance with the Doppler law and principle of motion relativity, i.e. these laws are invariant with reference to properties of medium (homogeneity or inhomogeneity). In moving medium they are fair only in the case of its homogeneity. In strongly inhomogeneous moving medium, propagation of sound is absolutely impossible.
文摘In the practice of instituting the system of intellectual property, medicine production is one of the key points concerning people inside and outside China. In the past six years, the medicine industry has undergone rapid development in the wake of the market economy. Although some problems cropped up in 1994, a series of laws, policies, regulations and measures has been formulated for strengthening administration. This shows how the protection of intellectual property and the deepening reform of the medicine industry are being enhanced by the Chinese government.
基金National Natural Science Foundation of China and Science and Technology Foundation of Shanghai Jiao Tong UniversityGrant number:50375094 /E05010705
文摘It is reported that some types of insects have a remarkable ability to detect the direction of an incident sound even though its acoustic sensory organs are in very close proximity each other. Maybe the ears are jointed by a cuticular structure with which the separated motions can be coupled mechanically and thus be magnified. In this paper, a detailed model is setup to describe the principle of this type of localization using a mechanical coupled structure. The transfer functions and the responses of the model in terms of time and frequency are analyzed to describe the mechanism of its ability of directional hearing. This analytical model provides a method to design the experimental model for the predetermined incident sound pressure, and the analysis of this model shows that this structure have the ability to determine the direction of the incident stimulus.
文摘When you go to Fashion Week,the talk is all about what’s trending in colors,cuts,hemlines,and finishes.When you go to retail seminars,it＇s about data.And how artificial intelligence（AI）,machine learning,
基金Supported by Major Scientific and Technological Special Projects in Zhejiang Province(2008C12056)~~
文摘[Objective] The aim was to study the effects of sound waves with different types and frequency characteristics on the growth of cowpea（Vigna unguiculata）during seedling stage.[Method] The insect-music mixed sound（MI）,cuckoo acoustic song,cricket acoustic song,single 400 Hz frequency sound wave,F5 and Fn sound waves composed of different frequencies were designed to investigate their effects on height and weight of cowpea seedling,and experimental data were statistically analyzed and multiple-compared by EXCEL.[Result] After treatment by sound waves with six different types and frequencies,the growth situations of cowpea were better than that in control.This indicated that sound waves could significantly promote height growth of plant.The treatments with good growth-promotion effect included 400 Hz frequency sound wave,cuckoo acoustic song and cricket acoustic song,followed by MI,Fn and F5.Cuckoo and cricket acoustic song treatment could promote the weight of cowpea seedling during seedling stage.[Conclusion] Sound waves with different types and frequency characteristics had significant growth-promotion effect on growth of cowpea during seedling stage,but their effects were different.
