We use a geomet ric model to study the parameters in the standard model.By using only two parameters we can parametrize all parameters of leptons.The masses computed are in ag reement with the results from experiments.We think that this may lead to a new and profound understanding of the structure of the standard model.We also extend the method to the gauge bosons.The masses obtained by geometric method are also in agreement with experiments.
The new symmet ric block cipher SWING which we put forward here is wholly performed by the state change of a shift register.We give the detailed encryption and decryption schemes and setting s of some necessary parameters.By the cryptanalysis of key bit avalanche effect and plaintext bit avalanche effect, we show that SWING has remarkable properties on defending of some usual ways of cry ptanaly sis and attacks, such as linear and differential cry ptanalysis, and related keys.Besides security, easy implementation and high speed of encryption and decryption, SWING has as well the feature of precision and simple structure which serves efficient confusion and diffusion.
A method and a program chart for 3-D attenuation tomog raphy are developed.Rectangularg rid is used in model parameterization.Back projection tomography is applied to inverse solution.Numerical modeling shows the feasibility of the method, which produces significant results in data processing
Based on the concept of computational quasi-stability, the computational stability of the explicit difference schemes fo r the forced dissipative nonlinear evolution equat ions is analyzed, then the computational quasi-stability criterion is obtained.It provides a new thought and the theoret ical basis fo r designing a computationally stable difference scheme for the fo rced dissipative nonlinear atmospheric equations.
On the basis of analyzing hazard-fo rmative mechanism and hazard-formative factors of railw ay flood disaster, model of calculating fatality of railw ay f lood disaster is discussed and established by apply ing g ray theo ry and symbolic statistics.During the study, the authors take 39-years (1959 ～ 1997)flood disaster data of Xinjiang Line of New Eurasian Continental Bridge as the t raining data.Firstly, by analyzing and dealing w ith the historical data, flood disaster frequency, f lood disaster density and periods of disruption are determined to be the main indexes to evaluate fatality of railw ay flood disaster of Xinjiang Line of New Eurasian Continental Bridge, and the w eighting of three indexes are 5 、3 、2 in turn on the basis of gray theory.Then, take the distance betw een grade three stations along railw ay as analysis unit, and on the basis of the interrelationships and the w eighting of each of three indexes, a model of evaluating the fatalness of railw ay f lood disaster is established.Lastly, the model established in this paper are applied into pract ice and calculate the fatality of the research uni ts of Xinjiang Line of New Eurasian Continental Bridge, and find that the result calculated is very close to the distribution condition of flood disaster along railway.
The discovery of bio-ef fects induced by ion implantation has opened a novel branch in the field of radiation biology ———the low energy heavy ion biology.The experimental samples in the field have, however, been within the limits of plants and microbes because of the sample's vacuum-resistant ability.The mutation studying of mammalian cells with ion implantation hasn't been reported in the past years.The main reason for that is that it is difficult to keep mammalian cells alive in vacuum during ion implantation.In the present study, the tolerance of mammalian cells in vacuum was enhanced efficiently by pre-treatment with glycerin at low concent rat ion and proper treatment time, which provides a new way for the study on the biological effects of ion beam implantation in the mammalian cells.
The main purpose is using the property of distribution of values of Dedekind sums to study the asymptotic propert ies of Dedekind sums. On the basis of J. B. Conreycs research, perfect the study of mean value problem of Dedekind sums in the form of 6|S( h,k)|n.
Acco rding to swinging cross-bridge model,muscle contraction is produced by cyclical attachment and detachment of cross-bridges towards thin filament.The cooperat ive behaviors of cross-bridges in muscle isotonic contraction in one dimensional condition is investigated.Firstly, we suppose a relationship betw een energy and time for a single cross-bridge during the working cycle. Then we invest ig ate two particular cooperative behaviors of cross-bridges in muscle isotonic contractio n(in which the ex tern load F is constant):(1)n0 attached cross-bridges work at the same tempo, the working process is not af fected by the environment ;(2)n0 at tached cross-bridges work at the same tempo, and the working rate is propo rtional to the very velocity of thin filament in the cont raction.We have calculated the relationship between the extern load to muscle and the velocity of muscle cont raction in the two condit ions.We find that in the first case it is similar to the Hill curve in shape, and in the second case the velocity is inversely proportional to the force.
A muti-phase model of metal ion speciation in human interstitial fluid has been const ructed and the effect of Pr(Ⅲ)on Zn(Ⅱ)speciation has also been studied.Result s show that Pr (Ⅲ)ions influence the distribution of Zn (Ⅱ)species.Zn (Ⅱ)is mainly dist ributed as [ Zn (HSA)], [ Zn(IgG)] and [ Zn(Cys)2H].Pr(Ⅲ)can not compete wi th Zn(Ⅱ)to fo rm HSA and IgG complex, w hile it can compete w ith Zn(Ⅱ)as phosphate and carbonate, causing the redist ribution of Zn(Ⅱ)species.
Describes the design and expected performance of a contact-cooled monochromator for use under condition of heat fluxes up to 0.5 W/mm2 and total power about 100 W.The monochromator has a cross section in the shape of letter T.FEM analysis was made of the monochromator.Taking the displacement data of the crystal into SHADOW, rayt racing result shows that the T monochromato r has a better performance than the regular base-cooling monochromator, especially in the higher photon energy range.
The classification and the synthesis of phthalocynine dyes for CD-R were summarized.The relationship between phthalocynine's structure and its properties, including the applied performance were discussed.Then a brief prospect on phthalocy nine application was made.
Using TOPEX/Poseidon satellite altimeter data, and seawater temperature and salinity estimated from WOA98 model, we calculated sea level height variation caused by seawater density change in multi-layers.The result shows that seawater density change is an important factor on sea level height variation at seasonal time scale.The displacement at Shanghai GPS station and J2variation in Earth's gravity field are quite different, while sea level height variation caused by seawater density change is removed or included from TOPEX/Poseidon observat ion.The result show s that i t is more important to separate sea level height variation caused by seawater density change in the study of Earth dynamic problem.
The general structure of SAFER block ciphers adopts SP-network.It's desig n has some original features.In this paper, the design technique of SAFER block cipher is analyzed.Along the process of improvement of it's designers, we give a description of and attack on their confusion layer, diffusion layer and key schedule algo rithm.In the end, some problems about SAFER design are proposed, and will be studied later.
A definition to shock waves in solid medium, namely, a clear description to its fundamental properties, was given in this paper.We regard the thin area of waves in solid medium with sharp changing of its physical character as shock waves.Four different kinds of initial conditions were given to study the properties of the distance of shock wave formed in solid medium.The effect of factors, such as amplitude, initial frequency, nonlinear coeff iciency, etc.on the distance of shock w aves w ere studied in some details.Numerical methods, the explict MacCormack and MacCormack TVD schemes with finite differences, were used to study shock waves in solid respectively, which avoid causing some unphysical solutions.
Low energy N+ion implantation technology is used in the mutat ion breeding and fermentation on g lutamic acid yielding start ing st rains of D110 and D110B.It is showed in this study that tw o high yielding glutamic acid st rains D5221 and B3263 are screened out and the average rocker bot tle fermentation GA(%)can achieve 8.4 %、7.5 %, they are respectively raised by 35.48 %、25 % compared to the original strains.There are clearly improved in the aspect on the fi rst class seed fermentation curve.And thei r log arithm phase has generally improved by 2 ～ 3 h.From the fermentation curve it is showed that thei r metabolic capacity are improved, the multiplicat ion cycle are shortened.So it w ill play a positive role in reducing the fermentation cycle.
The lay out of transmission ion chambers of Small Angle Scattering Station at Beijing Synchrotron Radiation Facility can realize the normalization of experimental data with respect to the thickness of sample. The process to carry out the normalization is studied corresponding to the layout.
Through absorbance measurement of conjugated linoleic acid, methy lester of conjugated linoleic acid and conjug ated linoleic acid trigly cide from 210 ～ 300 nm by UV-9100 spectrophotometer, absorbancy curve of measured samples at different concent ration is plotted.In the appropriate concentration range of samples, linear relationship of absorbancy and samples concent ration is presented by linear regression with Microcal Software Origin Version 4.0 system.The accurate concentration of conjugated linoleic acid is obtained with PE Autosystem XL-T ruboMass.Combined w ith reg ression constant data, emprical formula for the quantitation of conjugated linoleic acid by UV spect rophotometer is given.
The red pigment producing strain Monascus was mutagenized by 10 keV N+ ion implantation. After the optimal mutation dose was determined, one high yielding strain was bred through two rounds of mutagensis.The red pigment yield increases 38.1 %, and its tone is good.The ferment characteristic of the strain was also studied
Taking a PCI data acquisition board as an example, this paper describes the design approach of the PCI driver kernel module on Linux platform.This driver has been installed in EPICS system (Experimental Physics and Industrial Control Sy stem).Data channels have been built between EPICS database and PCI data acquisition board and tests have been done in EPICS envi ronment.The PCI board, a new alternative I/O interface device is provided for the EPICS users.