固定绕线电感器自谐频率影响因素分析与实验

针对小型化大电感量的固定绕线电感器自谐频率通常较低的问题,利用等效模型与要素分析得出主要影响因素分布电容的影响规律,并对如何调整分布电容大小进行实验验证。提升自谐频率的方案简单易操作且节约成本,对于已经定型的固定电感器产品在不改变电感量的情况下进行自谐频率提升有着一定的参考价值。

二自由度自谐式机器人动力学的研究

本文对引用弹性元件的二自由度谐式机器人的动力学进行了分析,在该模型中引入了负反馈系统。按预期的机构运动规律和系统的稳定性要求,研究了反馈放大系数的合理选择,并对构件单独和同时运动的仿真图线进行了分析。

LGA型固定电感器自谐频率的探讨

本文以大量的试验结果说明固定电感器自谐频率与自身的分布电容的关系.并提出如何来减小分布电容从而提高固定电感器的自谐频率.

智能型电感自谐频率自动分选仪

本文介绍一种用于电子测量领域的智能测试仪器。重点论证该仪器的设计方案和技术难点,以及仪器的性能和它的应用范围。这种仪器设计独具特色、技术先进,在国内处领先地位。

Discussion on Action and Potential of Fenlong Megascience in the Symbiosis between Human and Nature

The fourth new farming model Fenlong is identified as megascience for the first time. Fenlong can be directly applied to farming of farmland, remoulding of mortar black soil and saline alkali land and development of degraded grassland. Deep loosening can create huge soil reservoirs, reduce fertilization, promote indi- rectly the improvement of river water fisheries and water sources and the upgrading of shaping and hydropower industry, thus making a new round of mobilization and pooling of natural resources. As a result, the nature is able to produce good food needed by human, the spatial dimension of the land is increased, the natural pre- cipitation storage is increased, the flood and drought disasters are reduced, the eco-environment is improved, and the economic benefits are increased. Fenlong is not restricted to global application by ecological region and crop variety and is not subject to the time-space constraints for a hundred thousand years. On the basis of utilizing the heaven and earth resources, it brings about a huge effect of mega- science. Compare with traditional farming, the depth under the mode of Fenlong is increased by 2-3 times, the contents of nutrient, water, oxygen and microorganism in the soil are increased by 10%-200%, the content of pale salt is increased by 20%-40%, the temperature is increased by 2-4 ~C, and the photosynthetic efficiency of crops is improved by 10%. Under the cultivation mode of Fenlong, the yield of crop applied with no fertilizers is increased by more than 10%, crop yield is still in- creased by more than 5% when the application amount of chemical fertilizer is re- duced by 10%-20%. Under the farming mode of Fenlong combined with no in- crease in fertilization, the crop yield, crop quality, farming efficiency, natural precipi- tation storage and air humidity are increased by 10%-50%, 5%, 15%, 100% and 5%, respectively, and the emissions of methane and other gases are reduced by more than 5%. Even in mortar black soil, saline alkali land and degraded grassland, the yield is still increased by 15%-50%. These improvement effects can last for many years, helping achieve the real harmonious coexistence between human and nature.

A Novel Local-Dielectric-Thickening Technique for Performance Improvements of Spiral Inductors on Si Substrates

A novel local-dielectric-thickening technique i s presented for performance improvements of Si-based spiral inductors.This technique employs the processes of deposition,photolithography,and wet-etching,to locally thicken the oxide layer under the inductor,which can decrease the substrate loss and improve the inductor performance.Both the structures and processes are compact,economical,and compatible with CMOS processing.Several square spiral inductors with different inductances are fabricated,and the quality factors and the self-resonant frequencies both increase clearly with this proposed technique:for the 10nH,5nH,and 2nH inductors,the peak quality factors are effectively improved by 46.7%,49.7%,and 68.6%,respectively;however,the improvement percents of the self-resonant frequencies are more significant,which are 92.1%,91.0%,and no less than 68.1% respectively.

Theoretical Explanation for Lower Order Harmonic Resonance Phenomenon of Three-Ring Gear Transmissions

Dynamic investigations revealed that lower order harmonic resonance phenomenon exists in the three ring gear transmission. That is, when the input speed is close to 1/3, 1/6, 1/9,…, 1/3 n of the primary natural frequency of the transmission, the loads on the bearings and gears are especially high. This paper explained this phenomenon from the viewpoint of parametric resonance in terms of perturbation technique. A conclusion was drawn that the basic reason for this phenomenon is the primary resonance caused by forcing excitation and parametric resonance caused by parametric change.

On English teaching from psychology and cognition

In English teaching, it is necessary to pay attention to students＇ psychology and cognition in order to make them harmonious and effective. Therefore, English teacher would change their teaching opinions, realizing teaching object, guiding student＇s minds and ideas to study by some measures, such as accordant teaching and study, making students as a base in study, and students＇ self-study. In other words, making student study actively rather than passively is much better for their English abilities.

A new single degree-of-freedom resonance device

A new single degree-of-freedom （1 DOF） resonance device was developed. It mainly comprises a linear motor, a vibrating screen, a supporting spring set, a supporting frame and a damper set. Forces acting on the vibrating screen were found. A differential equation for describing the forces was set up. Equations that were used to evaluate the exciting force and exciting frequency in resonance were derived from the solution to the differential equation. In addition, an equation for evaluating the deformed magnitude of the damping springs in the damper set was presented so that the suitable damping may be obtained. Finally, a Matlab/Simulink model of the new i DOF resonance device was also built. Displacement-time curves of the vibrating screen under four conditions were obtained in the use of the Matlab/Simulink simulation. The curves indicate that it can shorten the time for the vibrating screen to be into the stable resonance with increasing the damping, and it can lengthen the time with increasing the vibrated mass or amplitude, but every given angular frequency cannot acquire the desired amplitude value of resonance.

Theoretical analysis of adaptive harmonic window and its application in frequency extraction of vibration signal

The goal of this paper is to find an excellent adaptive window function for extracting the weak vibration signal and high frequency vibration signal under strong noise.The relationship between windowing transform andfiltering is analyzed first in the paper.The advantage of adjustable time-frequency window of wavelet transform is introduced.Secondly the relationship between harmonic wavelet and multiple analytic band-pass filter is analyzed.The coherence of the multiple analytic band-pass filter and harmonic wavelet base function is discussed,and the characteristic that multiple analytic band-pass filter included in the harmonic wavelet transform is founded.Thirdly,by extending the harmonic wavelet transform,the concept of the adaptive harmonic window and its theoretical equation without decomposition are put forward in this paper.Then comparing with the Hanning window,the good performance of restraining side-lobe leakage possessed by adaptive harmonic window is shown,and the adaptive characteristics of window width changing and analytical center moving of the adaptive harmonic window are presented.Finally,the proposed adaptive harmonic window is applied to weak signal extraction and high frequency orbit extraction of high speed rotor under strong noise,and the satisfactory results are achieved.The application results show that the adaptive harmonic window function can be successfully applied to the actual engineering signal processing.

On the Theory of Harmonious Co-existence between Man and Nature by Marx and Engels

Marx and Engles believed that man and nature develop harmoniously, when the activities of man constitute the content of nature, which is changed constantly because of the activities of man. Marx and Engles also pointed out the duality of the conquest, change and influence exerted on nature by man. On one hand, it can improve people’s living conditions and make people free from the enslavement of the nature. On the other hand, it may also lead to excessively snatching and wrecking nature, then make the deterioration of the environment and ecology out of balance. They also, from the technical angle of ecology, put forward the concrete measures to realize the harmonious symbiosis of man and nature in the development of economy. They also believed that only when socialism or communism is realized, can the conciliation of mankind and nature be realized finally. Marx and Engle’s theory of harmonious symbiosis of man and nature is of great theoretical directive significance for us to insist on the scientific development view.

Nature as Harmony： The Foundation of Chinese Poetry

This paper argues for the very foundation of Chinese poetry, that is, nature itself. To this end, I have chosen three well-known poets, Wang Wei （706-761） in Tang Dynasty （618-907）, Su Shi （1037-1101） and Zhou Dunyi （1017-1073） in Northern Song Dynasty （960-1127）. All three poets were also high ranking governmental officials. They were leaders of high personal integrity.

Harmony between man and nature:the base for the harmonious society

The harmony between man and nature is the base for the harmonious society. It is determined by the eco-ruleand eco-economic rule. Human being should not violate the eco-rule. However, human being can make eco-systemsupply suit economic growth and its speed through systematical innovation and restriction of human economic activityand choice. Through technological innovation, efficiency satisfaction of unit resource can be increased; structure andfunction of eco-system can be perfected; supply capability of eco-system can be improved. To build the harmonioussociety, human should consider the reasonable distribution of limited resources from two sides. The first one is that theutilization of two functions of resource supply and pollution purification to nature should not exceed its special supplycapability formed under its special structure and function states, i.e. harmony between man and nature. The second sideis human being should think over the reasonable and effective distribution of limited resources in economic society, i.e.harmony between human beings and society. The reasonable economic activity of human being is the key to the harmo-nious development of man and nature.

Energy Level of Coupled Harmonic Oscillator Model Born of Heisenberg Ferromagetic Spin Chain Derived by Invariant Eigen-operator Method

Based on the coupled harmonic oscillator model, which is born of Heisenberg ferromagnetic spin chain with nearest-neighbor interactions, we adopt the invariant eigen-operator method to derive its energy level, which provides an alternate approach to dealing with the dynamics of spin chain.

Establish the New View of Nature and Environment-The Discussion about the Important Philosophical Foundation of Project Ethics

In the modem project, how to understand and deal with the relationship between man and nature correctly, and how to treat ecology, resource, lives of animals and plants correctly have become the outstanding and urgent subjects day by day. Thee article illustrated that the new views of nature and environment are the important philosophical foundation of project ethics from three aspects： the recognition of the relationship between man and nature, the meditation of traditional mode of production, and the ecological and environmental consciousness.

An East-West Encounter in Underground Man： Harmony in Gabriel Tarde and in Chinese Philosophy

French philosopher Gabriel Tarde is known as a philosopher who describes sociology ontologically with an integrated approach and mostly by means of metaphysical interpretations. Opposing his coeval Durkheim＇s “social fact”, Tarde claims that this notion constitutes a methodological problem and the term “social” of Durkheim＇s crowds out “variability of relations”. According to him, determinants in social relations are more general and dynamic notions, such as： “change”, “contrast”, and “adaptation”. In this respect, not quite celebrated in his era, this philosopher is widely known as a metaphysician as well as a sociologist. His metaphysical ideas are clearly visible in various sections of his works, where he described with inspirations from natural phenomenon. Descriptions and analysis on natural phenomena constitute the greater part of his works. He points out similarities between the universe and the world of men in terms of functioning. Presenting these similarities, Tarde seems to reject any division between the men and the nature built up by “positive philosophy” and modern understanding. With his natural descriptions and concepts he inferred from these descriptions, such as“contradiction” and “harmony”, he almost tries to re-establish the bonds between the nature and the social life. Tarde＇s perception of holistic being and his ideas of “contradiction” and “harmony” in nature, are very close to the most basic axioms of the traditional Chinese thought. As a matter of fact, Tarde denotes these similarities in his novella called “Fragment d＇histoire future （Underground Man）”. It is also an example to display an “East-West encounter” on a fictional plane.

Tunable Self-assembled Weak Polyelectrolyte Brushes

The authors have investigated the pH and ionic strength response of self-assembled layers formed by adsorption of amphiphilic weak polyelectrolytes. Using the SFA （Surface Forces Apparatus） the authors measured force-distance profiles of poly （isoprene）-poly （acrylic acid） block copolymers adsorbed on mica. Also by Atomic Force Microscopy the authors captured single polyelectrolyte molecule adsorbed on a surface. The effect of salt concentration （Cs） and pH upon the height of the brush layers was explored mainly by measuring the forces between two adsorbed polyelectrolyte brushes. At pH = 4 our results are in good agreement with the scaling prediction L0 ∝Cs-1/3 Changing the pH from 4 to 10 causes a remarkable swelling of the polymer layer, but only a weak dependence on salt concentration was detected at the higher pH. This can be attributed to the degree of dissociation, which depends on the local pH value. At low pH the polyelectrolyte chains have a low charge density, while on increasing the pH the degree of dissociation rises, and the increased charge density is followed by swelling of the adsorbed layer. The local concentration of ions in the brush is now greater than that of pH = 4 and approximately equivalent to 0.3 M. So the swelling is only weakly dependent on salt concentration in the range 0.01-1.0 M. The results demonstrate the tunable nature of such self-assembled polyelectroiyte brushes whose height and range of interactions, can be systematically controlled by adjusting the pH and ionic strength of the medium.

Man, City, and Nature in The Woman Warrior and Ballad of Eternal Sorrow

In a time of the global market economy, if one wants to live harmoniously together with nature or living environment, he should not think with a theoretical mode of dualist contradiction but that of harmony and coexistence such as ＂wholeness of man and nature＂. To illustrate this point, this paper thinks The Woman Warrior and Ballad of Eternal Sorrow are two significant texts： Ballad of Eternal Sorrow tells an ordinary, self-respecting, and life-respecting story of WANG Qi-yao and the girls like her as well as the city Shanghai. They blend into one harmonious whole： The city is like the girls and the girls match the city. Likewise, The Woman Warrior highlights the significance of naturc on the girl narrator＇s epiphany and healthy growth. The narrator comes to understand that paradoxes are the basic existent condition of human beings and so what she needs to do is to be magnanimous and balanceable in accepting these paradoxes.

Transport Properties of Two-Dimensional Electron Gases in Antiparallel Magnetic-Electric Barrier Structures

We study theoretically transport properties of two-dimenslonal electron gases through antiparallel magneticelectric barrier structures. Two kinds of magnetic barrier configurations are employed： one is that the strength of the double δ-functlon in opposite directions is equal and the other is that the strength is unequal Similarities and differences of electronic transports are presented. It is found that the transmission and the conductance depend strongly on the shape of the magnetic barrier and the height of the electric harrier. The results indicate that this system does not possess any spin filtering and spin polarization and electron gases can realize perfect resonant tunneling and wave-vector filtering properties. Moreover, the strength of the effect of the inhomogeneous magnetic field on the transport properties is discussed.

Atomic GHZ States Prepared in Two Directly Coupled Cavities with Virtual Excitations in One Step

A scheme for one-step preparation of atomic GHZ states in two directly coupled cavities via virtual excitations is proposed.In the whole procedure,the information is carried only in two ground states of A-type atoms, while the excited states of atoms and cavity modes are virtually excited,leading the system to be insensitive to atomic spontaneous emission and photon loss.