Abstract: The concept of coregionalization and coregionalized variable are described. The cross-moments and its properties (such as cross-covariance and cross-variogram) are discussed in more detail. In the view of above analysised, the cokriging (include cokriging systems, cokriging variance and so on) is studied mainly, and the mean grade of gold in a block is estimated. This method makes use of estimated level of Au and Ag in neighborhood.
Abstract: Blast furnace is a high temperature reactor which includes complex physical chemistry reaction and transportation process. The model of partical reaction, section balance of heat and materials can not fit in quick changes of condition of BF. The theorem on fuzzy mathematics is applied to deal with uncentain knowledge. From this, this knowledge base and reasoning mechanism are formed. Furtherly, the expert system based on AI is established for judging the state of BF. Expert system can refrain from the negligence of tiny changes of information by even excellent operator.
Abstract: The helical, linear and rotary magnetic field were employed in the experiment on solidification of the molten metal Tin (Sn) by means of a new type of multifunctional electromagnetic stirrer (EMS). The influences of the stirring types on the metallurgical effects were investigated. The results of industrial test at secondary cooling zone for billets demonstrated that the helical EMS can mitigate the white band for strand, increase the ratio of the equi-axial zone, decrease the defects in the central part, improve macrosegregation and distribation of the inclusions, and help to remove the inclusionst
Abstract: A computer program to simulate the temperature distribution and the volumetric changes occuring in ductile iron rolls during solidification is presented. Direct finite-difference method has been used to calculate the temperature distribution. With the help of computer modelling a new technique for producing riserless ductile iron roll castings has been developed and a perfect sound ductile iron roll castings without riser has been produced.
Abstract: The strengthening, toughening and fracture behavior of composite white cast iron which was composed of reinforcement steel bar and white cast iron have been researched. The results of bend tests and impact tests of specimens of composite white cast iron indicated that the bending strength and impact toughness of it were superior to those of straight white cast iron. The improvements of bending strength and impact toughness were related to the volume fraction of reinforcement bar. Three fracture modes of steel bar in composite white cast iron were found by examining the surfaces of fracture by SEM. Those were brittle fracture, ductile fracture and mixed fra- cture, and thus the different strength and toughness of composite white cast iron were effected.
Abstract: A Mechanism of the G.S structure consisted of comical helixes is presented based on TEM, and the arrays of misoriented graphite platelets {0001} in each comical helix are believed to be grew up in spiral. The effects of Mg and Ce additions on the nucleations and growth of graphite are also discussed. The microstructure on the section of G.S observed earlier can be explained satisfactorily in term of the model.
Abstract: This paper unifies the phenomenological theory of crystallography and that of kinetics, and builds a new theory based on the phase interface motion for the martensitic transformations. The interface can be described with a characteristic tensor, which is the invariant plane strain. Thus, the motion of this interface will transform the parent phase to martensite,conforming to all regulations of the crystallography such as habit plane, orientation, etc. On the other hand, the interface can be taken as an elastic and plastic layer. The characteristic tensor, functioning as strain, corresponds to certain elastic and plastic energy (work), which is exactly the friction quasi-enthalpy in the friction function during the interface moving. The interface, i.e. the invariant plane, usually is not a rational plane and is consisted of various low index facets. The number of the configuration of the facets consists the configuration entropy of the interface, which is exactly the friction quasi-entropy in the friction function. Thus, the motion of the interface will show all the kinetic behaviors such as reversibility and hysteresis during the marten-sitic transformations.
Abstract: The distribution of B and N in 18CrMnB steel during the hardening at 870℃ is investigated by means of the microphotography, and CB is used as a parameter to show the distribution of N in the steel. The results obtained are as follows: the hardenability increases with parameter Cβ, and if its value is between 14.5 though 27.5, the high hardenability of 18CrMnB steel is obtained. Cβ is a useful parameter for controlling the hardenability of this steel.
Abstract: J.T.S forging process is investigated for improving in current production by high temperature moire modelling technique. Some suggestions which can be used for improving current production are put forward. The rational range of temperature gradient is 230℃~270℃. The reduction rate is 7%~8% on each side for fourfold side symmetrical forge piece. The reduction rate is 13% that can be used for vertical two side unsymmetrical forge piece, The optimun of anvil width ratio (W1/H0) is 0.6, The improving J.T.S forging process can decrease the consumption of energy 20%~25%; It can save operating time 40%; and decrease the deformation load 23%~43%.
Abstract: In order to determine the interactions between copper atoms and rubber molecules, this article used X-ray diffraction to analyse the cure specimen of size materials mixed with copper powder for the first time, found the atomic nucleus distances between copper and atoms in rubber molecules were equal to 0.23169nm and 0.3043nm. 0.3043nm reflected the atomic distance between Cu and S under the action of Van der Waals force. 0.23169nm stated that there was chemical interaction between Cu atoms and rubber molecules.
Abstract: It is described that the effectual way to construct phase diagrams is the combination of computer calculation with some critical measurements. Examples of application to the CuO-RE2O3 （RE. La, Y, Nd）, Na2B2O4, K2B2O4 and PrCl3-CaCl2-MgCl2 systems are given.
Abstract: The Model 368 system was used to measure the AC impedance of the process of electroless nickel plating. One inductive loop is found at low frequencies. A theoretical model including the step of adsorption of H2PO2- ions is established based on the AC impedance measurements.
Abstract: The internal friction, electric resistance, shape change, frequency and temperature in Cu-Zn alloy were measured simultaneously during phase transformation. The results show that the change of those quantities were exhibited certain correlation. The change of electric resistance in Cu-Zn alloy during phase transformation was calculated and the calculation result is well consists with the experimental curve.
Abstract: According to the characteristics of the logP1-logP2 dominant phase diagrams and the E-pH diagrams, two functions: q and P function have been defined. By means of these two functions the stable triple point can be determined. The method is easily programmed and used for calculation of other types of dominant phase diagrams.
Abstract: A new extraction-chromatographic separation of indium (Ⅱ) from coexisted ions has been introduced. The di(1-methylheptyl) methylphosphonate (P350) resin is used as a stationary phase clear-cut separation is evidenced by the blank eluates in between the elution peaks of indium (Ⅲ) and its neighbouring ions,so that it can be used in the determination of indium. In the presence of suitable surfactant (such as CTMAB etc) the collected eluate of indium (I) is coloured with suitable chromogenic reagent (such as salicylfluorone etc), and then the indium may be determined spectrophetometrically. From the determined data of indium in some synthetic solutions and actual samples, it has been proved that this procedure is suitably used to determine microamount of indium with high accuracy and reproducibility.
Abstract: It is proved that Win's conjecture is true for k = 3. A better conclusion is obtained. There exist two Hamilton cycles and a 1-factor which are edge-disjoint in a Ore-type-(3) graph of order 2n (n≥10). Moreover, this result is best possible for δ(G)=5.
Abstract: The diffraction formula of a kind of lattice of points with 12-fold symmetry is deduced. The optical transform of the lattice of points is made. By different ratio of the reciprocal lattice, several diffraction patterns are drawn through eliminating the diffraction spots of different intensities. One of the patterns agrees with the optical transform of the lattice of points andis approximate the diffraction pattern of Ni-based superalloy and another patternis approximateo the diffraction pattern of quasicrystal with 12-fold symmetry. The possibility that ‘quasicrystals with 5-fold, 8-fold, 10-fold and 12-fold symmetry’ may be in fact periodic structures should not be excluded.
Monthly, started in 1955 Supervising institution：Ministry of Education Sponsoring Institution：University of Science and Technology Beijing Editorial office：Editorial Department of Chinese Journal of Engineering Publisher：Science Press Chairperson：Ren-shu Yang Editor-in-Chief：Ai-xiang Wu ISSN 2095-9389CN 2095-9389
