High Q Characteristics of the Helical Resonance Polycavity and its Coupling Field

In the 30~(MHZ)-1000~(MHZ) frequency band, the oscillator or filter is constructed by high Q screw resonatores. However, we can convennient ly expand or compress the frequency band. In fact, it is impossible to make UHF, VHF oscillators or a filter with the crystal resonatores or composite paramenter devices, in the frequency board within the VHF higher end and UHF band. So it is most important to study the screw resonator for the design of the duplexing technology on the satellite, frequency multiplier, oscillator or polycavity screw filter.This article deals with the monocavity field distrubution, chromatic dispersion charactor and polycavity mutual inductance help each other and has made apractic film of the experiment.     

The simulation of the formation of dibenzothiophene and dibenzofuron

The results of simulation indicate that biphenyl (BIP) is one of the original materials of dibenzothiophene (SF) and dibenzofuron (OF). It has the fundamental structure of SF and OF. As the radicals that attract electron, its two aromatic nucleuses influence each other, which make the α-H active. The strong electronegative sulphur or oxygen atoms attack the two places of the two aromatic nucleuses, seize the hydrogens and form H 2S or H 2O, the other sulphur or oxygen atoms attacking the two places which have lost hydrogens can put up a bridge and make the BIP molecule which can freely turn become a stable SF or OF molecule. So SF and OF have no definite relation with fluorene (F).     

Multi-Band UV Decision Making Method Based on LPC Analysis

IntroductionSince the multi- band excitation ( MBE) vocoderovercomes the limitations of the unvoice or voiceduality excitation in the linear- prediction coding( LPC) vocoder,it distinctly improves the timbreof synthesized speech.In the standard MBEalgorithm[1,2 ] ,the speech spectrum is divided intoa certain number of sub- bands according to thefrequency of the harmonics.For each sub- band,the spectrum amplitude Am is analyzed to judgewhether it belongs to voice or unvoice.In thedecoding p…     

Analytical criteria for local activity of CNN with five state variables and application to Hyper-chaos synchronization Chua's circuit

The analytic criteria for the local activity theory in one-port cellular neural network (CNN) with five local state variables are presented. The application to a Hyper-chaos synchronization Chua's circuit (HCSCC) CNN with 1125 variables is studied. The bifurcation diagrams of the HCSCC CNN show that they are slightly different from the smoothed CNN with one or two ports and four state variables calculated earlier. The evolution of the patterns of the state variables of the HCSCC CNN is stimulated. Oscillatory patterns, chaotic patterns, convergent or divergent patterns may emerge if the selected cell parameters are located in the locally active domains but nearby or in the edge of chaos domain.     

N-terminal of L protein of vesicular stomatitis virus contains a new signal sequence

The L protein (241kD) of vesicular stomatitis virus (VSV) is the most important snbnnit of the replication complex. The existence of specific localization signal in the L protein was investigated by making recombinant constructs expressing truncated mutants of the L protein fused to green fluorescent protein (GFP) in transient transfection assays. The chimeric genes encoding varied N-terminal of L and GFP gene were put under the control of T7 promoter or CMV promoter. The fusion proteins were transiently expressed in BHK-21, COS-7, CHO or Hep G2 cells. When more than 120 residues were deleted or only 96 residues were kept on the N-terminal, the fusion proteins were shown to be distributed throughout the cells, cytoplasm and nucleus under the confocal microscope. However, other chimeric proteins with 120 or more amino acids were dotted and distributed in the perinuclear regions. And the fusion protein with 96—120 aa has the similar distribution. A thirteen-residue peptide QGYSFLHEVDKEA (108—120) was identified as localization signal, whose function would be absolutely distributed with the deficiency of D or V. Our results show that there is an independent localizing signal in N-terminal domain of L protein of VSV and this functional signal is conserved in different cell lines.     

Production of High Carbon Ferrochromium Using Melt Circulation

Some fundamental studies related to the production of high carbon ferrochromium were summarized using melt circulation technology carried out in the School of Chemical Engineering at the University of Birmingham. These studies focused on the kinetics of chromite reduction in Fe-C(-Cr-Si) melts. The effects of feed mode,fluxes, amount and particle size of reductant, particle size of chromite, melt composition and the reduction temperature were investigated. The reduction mechanisms were discussed. The results showed that (1) the reduction rates of sintered chromite Pellets and non-compacted chromite powder in Fe-C(-Cr-Si) melts was generally very low,(2) addition of carbon in the non-compacted chromite feed greatly improved the reduction kinetics, (3) compaction of the carbon-chromite mixtures into composite Pellets further improved the reduction kinetics and (4) addition of lime in the composite Pellets increased the reduction rate, while the addition of silica may suppress the posihve effect of lime. It can be concluded that solid-state reduction, smelting reduction and dissolution proceed simultaneously during the reduction of compacted compostite pellets or non-compacted composite mixtures in Fe-C(-Cr-Si) melts,and the early stage of reduction is very likely to be controlled by either or both solid-state and/or gas diffusion through the oxide phases and/or the product layers.     

Syntactic Analysis of Chinese/English Code-switching in Besieged City

1.Introduction Code-switching(CS), the alternating use of two or morelanguages by bilingual or multilingual speakers within oneconversational episode, either in the same conversational turnor in consecutive turns, has become an increasingly topical andim…     

Palladium(Ⅱ) and Platinum(Ⅱ) Compounds Derived From Potentially Terdentate Ligands

1Introduction Transition metalcomplexes derived from potentially terdentate ligands have attracted great interest in the late years. Among all the examples described so far, those containing palladium(Ⅱ) or platinum(Ⅱ) and ligands holding three heteroatoms with different donor abilities are particularly relevant. In compounds of this kind, the potential hemilability[1] of one of the terminal σ(M-donor atom) bonds, plays an important role in the view of their applications in homogeneous catalysis[2]. On the other hand, it is well-known that in dimetallic complexes the presence of two different metals in a close vicinity may influence their mutual cooperation in a wide variety of processes[3]. Besides that, some examples of the utility of chiral palladium( Ⅱ ) as well as platinum( Ⅱ ) complexes as precursors for organic and/or organometallic synthesis, as chiral recognitors or discriminators, or even in Bio-Medicine have also been reported[4- 6]. However, chiral heterodimetallic compounds holding ferrocenyl units and potentially terdentate ligands are scarce.     

Thermodynamic properties and mixing thermodynamic parameters of two-phase metallic melts

Based on the calculating model of metallic melts involving eutectic, the calculating equations of mixing thermodynamic parameters for two phase metallic melts have been formulated in the light of those equations of homogeneous solutions. Irrespective as to whether the activity deviation relative to Raoultian behavior is positive or negative, or the deviation is symmetrical or unsymmetrical, the evaluated results not only agree well with experimental values, but also strictly obey the mass action law. This testifies that these equations can authentically reflect the structural reality and mixing thermodynamic characteristics of two-phase metallic melts. The calculating equations of mixing thermodynamic parameters for the model of two phase metallic melts offer two practical criteria (activity and mixing thermodynamic parameters) and one theoretical criterion (the mass action law).     

Seismic hazard mitigation for nuclear power plant

The seismic safety of nuclear power plan(tNPP)has always been a major consideration in the site selection,design,operation,and more recently recertification of existing installations. In addition to the actual NPP and all their operational and safety related support systems,the storage of spent fuel in temporary or permanent storage facilities also poses a seismic risk. This seismic risk is typically assessed with state-of-the-art modeling and analytical tools that capture everything from the ground rupture or source of the earthquake to the site specific ground shaking,taking geotechnical parameters and soilfoundationstructureinteraction (SFSI) into account to the non-linear structural response of the reactor core,the containment structure,the core cooling system and the emergency cooling system(s),to support systems,piping systems and non-structural components,and finally the performance of spent fuel storage in the probabilistically determined operational basis earthquake (OBE) or the safe shutdown earthquake (SSE) scenario. The best and most meaningful validation and verification of these advanced analytical tools is in the form of full or very large scale experimental testing,designed and conducted in direct support of model and analysis tool calibration. This paper outlines the principles under which such calibration testing should be conducted and illustrates with examples the kind of testing and parameter evaluation required.     

Relativity between corrosion-induced stress and stress corrosion cracking of brass in an ammonia solution

The susceptibility to stress corrosion cracking (SCC) of brass in an ammonia solution with various pH values or under various applied potentials was measured at slow strain rate tests. The additive stress in the same solution was measured using two methods. The results indicate that the variation of the susceptibility to SCC with pH value or with potential is in an excellent agreement with the corrosion (passive film or dezincification layer)-induced stress. When pH? 7, the corrosion-induced tensile stress and the susceptibility to SCC have maximum values and hardly change with increasing the pH value. However, when pH<7, both the corrosion-induced tensile stress and the susceptibility to SCC reduce rapidly with decreasing the pH value. Both the corrosion-induced tensile stress and the susceptibility to SCC have maximum values at the open-circuit potential, decrease slightly under the anodic polarization, and reduce gradually to zero under the cathodic polarization.