The virtual-ray method for treating HF electromagnetic scattering problems is derived from the plane wave of free space, and using this the plane wave scattering by an impedance wedge is studied. In the solution proce...The virtual-ray method for treating HF electromagnetic scattering problems is derived from the plane wave of free space, and using this the plane wave scattering by an impedance wedge is studied. In the solution process a novel concept of generalized circle is introduced so that the complete amplitude function is obtained. And a reasonable physical interpretation for the term W2, which was neglected previously, is given. The calculated results agree well with those of the analytical solution obtained by G.D. Maliuzhinets(1958).展开更多
This is an attempt to explain mRNA-dependent non-stationary semantic values of codons (triplets) and nucleotides (letters) in codon composition during protein biosynthesis. This explanation is realized by comparing th...This is an attempt to explain mRNA-dependent non-stationary semantic values of codons (triplets) and nucleotides (letters) in codon composition during protein biosynthesis. This explanation is realized by comparing the different protein codes of various biosystem taxa, and, comparing mitochondrial code with the standard code. An initial mRNA transcriptional virtuality (Virtual-Reality) is transformed into material reality at the level of translation of virtual triplets into real (material) amino acids or into a real stop command of protein biosynthesis. The transformation of virtuality into reality occurs de facto when the linguistic sign1 functions of the codon syhoms are realized in the 3’ nucleotide (wobbling nucleotide according to F. Crick) in the process of protein biosynthesis. This corresponds to the theoretical works of the authors of this article. Despite the illusory appearance of semantic arbitrariness during the operation of ribosomes in the mode of codon semantic non-stationarity, this phenomenon probably provides biosystems with an unusually high level of adaptability to changes in the external environment as well as to internal (mental) dynamics of neuron’s genome in the cerebral cortex. The genome’s non-stationarity properties at the nucleotide, codon, gene and mental levels have fractal structure and corresponding dimensions. The highest form of such fractality (with maximum dimension) is probably realized in the genomic continuum of neurons in the human cerebral cortex through this semantic Virtual-to-Real (VR) codon transcoding with the biosynthesis of short-living semantic proteins, as the equivalents of material thinking-consciousness. In fact, this is the language of the brain’s genome, that is, our own language. In this case, the same thing happens in natural, primarily mental (non-verbal) languages. Their materialization is recorded in vocables (sounding words) and in writing. Such writing is the amino acid sequence in the semantic proteins of the human cerebral cortex. Rapidly decaying, such proteins can leave a long-lasting “so-called” Schrödinger wave holographic memory in the cerebral cortex. The presented below study is purely theoretical and based on a logical approach. The topic of the study is very complex and is subject to further development.展开更多
Based on the inner character analysis of interpart, detail modification andassembly relation of mechanical connecting element, the idea, which extends the feature modeling ofpart to the interpart feature modeling for ...Based on the inner character analysis of interpart, detail modification andassembly relation of mechanical connecting element, the idea, which extends the feature modeling ofpart to the interpart feature modeling for assembly purpose, is presented, and virtual-part-basedconnecting element modeling is proposed. During the assembly modeling, base parts are modified bythe Boolean subtraction between the virtual part and the part to be connected. Dynamic matchingalgorithm, which is based on list database, is designed for dynamic extension and off-line editingof connecting part and virtual part, and design rules of connecting element is encapsulated by thevirtual part. A prototyped software module for rapid design of connecting elements is implementedunder self-developed CAD/CAM platform-SuperMan.展开更多
The structure features and driving modes of virtual axis NC machine tools are studied. Accor ding to different application requirements,the three axis control method,the five axis control method and the sixfre...The structure features and driving modes of virtual axis NC machine tools are studied. Accor ding to different application requirements,the three axis control method,the five axis control method and the sixfreedom control method are put forward.These results lay a foundation for the product development of the virtual axis NC machine tools展开更多
基金Supported by the National Natural Science Foundation of China
文摘The virtual-ray method for treating HF electromagnetic scattering problems is derived from the plane wave of free space, and using this the plane wave scattering by an impedance wedge is studied. In the solution process a novel concept of generalized circle is introduced so that the complete amplitude function is obtained. And a reasonable physical interpretation for the term W2, which was neglected previously, is given. The calculated results agree well with those of the analytical solution obtained by G.D. Maliuzhinets(1958).
文摘This is an attempt to explain mRNA-dependent non-stationary semantic values of codons (triplets) and nucleotides (letters) in codon composition during protein biosynthesis. This explanation is realized by comparing the different protein codes of various biosystem taxa, and, comparing mitochondrial code with the standard code. An initial mRNA transcriptional virtuality (Virtual-Reality) is transformed into material reality at the level of translation of virtual triplets into real (material) amino acids or into a real stop command of protein biosynthesis. The transformation of virtuality into reality occurs de facto when the linguistic sign1 functions of the codon syhoms are realized in the 3’ nucleotide (wobbling nucleotide according to F. Crick) in the process of protein biosynthesis. This corresponds to the theoretical works of the authors of this article. Despite the illusory appearance of semantic arbitrariness during the operation of ribosomes in the mode of codon semantic non-stationarity, this phenomenon probably provides biosystems with an unusually high level of adaptability to changes in the external environment as well as to internal (mental) dynamics of neuron’s genome in the cerebral cortex. The genome’s non-stationarity properties at the nucleotide, codon, gene and mental levels have fractal structure and corresponding dimensions. The highest form of such fractality (with maximum dimension) is probably realized in the genomic continuum of neurons in the human cerebral cortex through this semantic Virtual-to-Real (VR) codon transcoding with the biosynthesis of short-living semantic proteins, as the equivalents of material thinking-consciousness. In fact, this is the language of the brain’s genome, that is, our own language. In this case, the same thing happens in natural, primarily mental (non-verbal) languages. Their materialization is recorded in vocables (sounding words) and in writing. Such writing is the amino acid sequence in the semantic proteins of the human cerebral cortex. Rapidly decaying, such proteins can leave a long-lasting “so-called” Schrödinger wave holographic memory in the cerebral cortex. The presented below study is purely theoretical and based on a logical approach. The topic of the study is very complex and is subject to further development.
基金This project is supported by High Technology Research and Development Program of China (No.2002A411030).
文摘Based on the inner character analysis of interpart, detail modification andassembly relation of mechanical connecting element, the idea, which extends the feature modeling ofpart to the interpart feature modeling for assembly purpose, is presented, and virtual-part-basedconnecting element modeling is proposed. During the assembly modeling, base parts are modified bythe Boolean subtraction between the virtual part and the part to be connected. Dynamic matchingalgorithm, which is based on list database, is designed for dynamic extension and off-line editingof connecting part and virtual part, and design rules of connecting element is encapsulated by thevirtual part. A prototyped software module for rapid design of connecting elements is implementedunder self-developed CAD/CAM platform-SuperMan.
文摘The structure features and driving modes of virtual axis NC machine tools are studied. Accor ding to different application requirements,the three axis control method,the five axis control method and the sixfreedom control method are put forward.These results lay a foundation for the product development of the virtual axis NC machine tools
文摘虚拟同步机(virtual synchronous generator,VSG)控制缓解了新型电力系统低惯量弱阻尼特性,但也引入了功角振荡,导致功角稳定性问题。已有研究从控制参数自适应以及控制环重构角度改进VSG控制,但存在设计困难、物理意义不明确等问题。因此,该文首先基于等面积定则(equal area criterion,EAC),利用虚拟阻抗,提出“功角能量”快速衰减的改进控制思路,从图形解法解释了底层物理意义,并设计算法求解控制各阶段虚拟阻抗大小。在此基础上,分析改进控制思路可能存在的问题。其次,从补偿“阻尼功”缺失和提高控制适用性角度,构建基于虚拟阻抗频率自适应的控制策略,以实现不同工况下功角振荡的优化抑制。最后,通过电磁暂态仿真验证前述分析的正确性,并展示所提控制策略对功角振荡抑制以及功角稳定性提高的有效性。
