DETERMINATION OF TOTAL EL2 AND NET ACCEPTOR CONCENTRATION IN UNDOPED SI GaAs BY MULTI-WAVELENGTH INFRARED ABSORPTION METHOD

Total EL2 concentration distribution and net acceptor concentration distribution in uncloped semi-insulating(SI) LEC GaAs have been measured by multi-wavelength infrared absorption method. The experimental results indicate that total EL2 concentration radial distribution is W-shaped and net acceptor concentration radial distribution is sample-dependent, it can present a n shape, a A shape, or a W shape corresponding to different samples.

Adsorption Properties of Calcined Modified Sepiolite on SO4^2- and Cl^-

Three different kinds of sepiolite(Type A, Type B and Sepiolite fiber) were processed by calcination and analyzed by thermogravimetric analysis(TG), X-ray diffraction diffractometer(XRD), scanning electron microscopy(SEM), BET(specific surface area from N2 adsorption isotherms), mercury intrusion porosimetry(MIP), and infrared spectroscopic analysis(IR), respectively. The results show that the adsorption performance of sepiolite can be changed by calcination and environment temperatures, especially for calcination. The adsorption capacity of sepiolite fiber is bigger than that of Type A and B, and adsorption capacity of each sepiolite to sulfate is smaller than that of the chloride ions. Especially, the maximum value for adsorption of the sepiolite fibers, calcined at 600 ℃ and water bath at 60 ℃, to chlorine ion and sulfate are 5.95 and 5.71 mg/g, respectively(mg/g : the ions quantity adsorbed by a unit of sepiolite weight). The minimum adsorption of calcined sepiolite fiber to sulfate ions increased from 5.02 to 5.55 mg/g. While microstructure analysis of sepiolite by TG indicated that its structure was, for temperature not exceeding 700 ℃, was not changed significantly. Sepiolite has a porous structure, especially for sepiolite fiber, which can be observed by SEM. BET indicates that sepiolite fiber has a larger pore volume than others and this can be increased by calcination. IR shows that the adsorption of sepiolite to Cl-and SO42- belongs to physical absorption, instead of chemisorption.

INTERFACIAL DEBONDING OF FRC UNDER CYCLIC LOADING

With the increasingly use of FRC (fiber-reinforced composite) in urban lifelines, me-chanical properties investigation is very important for disaster resistance, especiallythe investigation of fatigue properties. Based on the shear-lag model, an usual com-posite model under cyclic loading is established. According to the Paris formula, therelationship between interfacial fatigue parameters and the number of cycles is ob-tained under the cyclic loading. Interfocial fatigue properties of this model and thegrowth of the interfacial fatigue crack are analyzed. And the Poisson ratio is consid-ered also.

Relationship between the Local Vibration Mode Characteristics and the Charge State of Carbon Acceptor in GaAs

The local vibration mode(LVM)of carbon acceptor in GaAs is studied by measuring directly the change in LVM absorption with a NIC-170 SX FT-IR spectrometer.The change in the charge state of carbon acceptor and the temperature dependence of the LVM absorption were investigated also.The contents of the impurities other than carbon were estimated by secondary ion mass spectrometry.It is observed that the frequency,the spectral form and the integrated absorption of the LVM are not affected by the change in charge state of car- bon acceptor.

Molecular Short Range Correlations in Nematic Liquid Crystal Films

A generalized functional variation theory of nematics is presented to take account of the local short range correlations between molecules.This theory is used to study nematics liquid crystal films.The nematics-isotropic transition temperature is determined.The orientational order parameter in each molecular layer and the internal energy per molecule associated with each layer are calculated.The numerical results are compared with those of the Monte Carlo simulation and of the mean field theory.

Backgrounds Constrain on the Torsion Detection

The sources of torsion,macroscopic rotation and aligned spin are discussed.In the case of Dirac spin particle as a direct sensor for torsion f the detection of torsion-spin effect is cons trained by the larger backgrounds stronglyt which are magnetic-spin and rotation-spin.Increasing the source of the torsion is equivalent to increasing the background itself.So,the conclusion is that Dirac particle spectra experiments have no hope to give the evidence for torsion directly in some special torsion gravity theory.

Application of fuzzy logic in weighted information of fusion fingerprints and palm prints

It is a developing job to distinguish identifications with information fusion of fingerprints and palm prints. It is also a very effective way to resolve the problem of low identification rate and low stability of single biology characteristic identification. Based on the theory of fuzzy logic theory, we bring out the method of obfuscating weigh coefficient and reliability to fuse the information of fingerprints and palm prints to realize high identification rate. The experiment proves the feasibility and effectiveness of this method and the identification rate can be more than 90%, which contributes useful experience to the research of identification using biology characteristics.

A CLASS OF STRONG LAWS OF LARGE NUMBERS WHICH HOLD FOR ARBITRARY COUNTABLE NONHOMOGENEOUS MARKOV CHAINS

The strong laws of large numbers for countable nonhomogeneous Markov chains have been discussed (cf. [1]—[3] ), where various restrictions were imposed on the Markov chains. The purpose of this report is to give a class of strong laws of large numbers which hold for arbitrary nonhomogeneous Markov chains. As corollaries of the main result, a relation between the relative frequency of occurrence of state couples and the transition probability of arbitrary nonhomogeneous Markov chains is established.

INFORMATION CONDITIONS FOR A CLASS OF LIMIT THEOREMS FOR THE SEQUENCE OF m-VALUED RANDOM VARIABLES

Let {X_n, n≥1} be a sequence of random variables taking values in S={1, 2,…, m} with the joint

A Modified WLR Method for Crystallographic Analysis on Martensitic Transformations in Cu-base Shape Memory Alloys

A modified WLR method for bcc to monoclinic transformations has been developed. With the aid of computer,the habit planes,the magnitude of the lattice invariant shear,rotation matrix and the total transformation matrix have been calculated for five alloys being in good agree- ment with the observations.

A CLASS OF LOCALLY RECURRENT FUNCTIONS Ⅱ

In this paper the author points out that the results in a previous paper can be generalized as follows.

A class of strong laws for the sequences of nonnegative integer-valued random variables

Let {Xn, n≥1} be a sequence of random variables taking values in S={1,2,…} with the joint distribution f（x1,…, xn）=P（X1=x1,…, Xn=xn）】0, xi∈S,1≤i≤n.（1） It is easy to see that {Xn, n≥l} are independent and identically distributed iff there exists a probability distibution on

A POSSIBLE MECHANISM OF THE FORMATION OF STRONG FIELD IN NEUTRON STAR

Ⅰ. QUARK CLUSTER PHASE AND ITS CONFIGURATIONS The fact is well established that the magnetic field in neutron star is very strong. At the surface of such a star the strength of the field may be as high as 1012 G.

SOME PROPERTIES OF THE RELATIVE ENTROPY DENSITY OF ARBITRARY INFORMATION SOURCE

Let {X_n, n≥1} be an arbitrary information source with the alphabet S={1,2, …, m} with the joint

POSITRON ANNIHILATION STUDY OF THE INFLUENCE OF DEFORMATION ON THE CARBONITRIDING PROCESS

Ⅰ. INTRODUCTION The deformed-thermochemical treatment is a new technology of heat treatment which has a bright future. But there are some discrepancies as to whether the dislocations produced in room temperature pre-deformation will accelerate the carbonitriding process or retard it.

PURE ANALYTICAL METHOD IN LAW OF LARGE NUMBER

Divide the interval [0,1] into two intervals [0,α] and [α,1] （0<α<1） by an arbitrary proportion, and denote them as δx1（x1=0,1）: δ0=[0,α], δ1=[α,1].

A LIMIT PROPERTY OF ARBITRARY INFORMATION SOURCE

A question of importance in information theory is the study on the Shannon-McMillan-Breiman theorem. In previous works, conditions such as ergodicity, stationarity or asymptotic stationarity were assumed (cf. [1] and its references). The purpose of this report is to give a similar theorem which is true for arbitrary information source.

STUDY ON PREDICTING THE DATA OF INDUSTRIAL CRACKER FROM A PULSED MICRO-PYROLYZER SYSTEM

The studies on chemical kinetics of pyrolysis and coking reaction of various reactants such as propane, ethane-propane mixture and light gas-oil as well as screening cokinginhibitors for pyrolysis have been done at the pulsed micro-pyrolyzer system designed and assembled by the authors and their co-workers. This system has the following advantages: less feedstock consumption, simple operation, easily changeable operating conditions and rapidly available experimental data, better reproducibility and higher reliability.

Magnetic field decay of X-ray neutron star

The origination and evolution of the neutron star magnetic field is a hot spot of current discussion. It was discovered in recent years that the magnetic field decay of the X-ray neutron star is inversely correlated with accreted mass, so Shibazaki et al. proposed a field decay empirical formula.Here, this inverse correlation and empirical formula can be deduced by theoretical model, and the field-period relation is given.

Photoluminescence Study on Defects in Neutron-Irradiation CZ-Silicon

1 Introduction In recent years, the irradiation defects in CZ-silicon have been studied extensively because the neutron-irradiation defects in CZ-silicon play a key role in controlling the yield and performance of VLSI circuits. However, because of the impurities (oxygen, about 1018 atoms/cm3) in silicon, behavior of irradiation-defects during heat-treatment has been proved to be complicated, while slices are subjected to neutrons irradiation and heat-treatment, the irradiation defect behavior has not been clearly understood yet.