The article put forward a new method equal slope grey clustering method to assessment water quality. The subject function is constructed by equal slope pattern,and the function has the virtue of high distinguish rate and great information utilizing rate.

The line passes through the points M(1 = 1/2) = Mη, M(1 = 0) = 1/2Mη which corresponds roughly to a straight line with equal slope as the Tung function at M1/2 with b = 2.7-3.0. This leads to a considerable saving in computation but very slight difference to the result.

In the experiments, all the borders studied had an approximately equal slope and constant length of 60 m, while the width of the border strips was varied from 1 to 4 m and the inflow rate was varied from 3.8 to 15.2 L/(s·m).

试验中畦田坡度基本一致 ,畦长均为 60 m ,畦宽变化范围为 1～ 4m ,单宽流量为 3 .8～ 15 .2 L / ( s· m )。

In the case of plate models, the fringes are loci of equal slope; for specimens provided with surface gratings, one forms patterns of partial derivatives of in-plane displacements.

Migrating and stationary boundaries of equal slope were formed in aging alloys as a result of intermittent segregation and coalescence of phases.

Analysis of the data obtained showed that the diameters of the nonaxial beam rings did not satisfy the condition for the appearance of rings of equal slope for the Fabry-Perot interferometer.

The Rasch model is an item analysis model with logistic item characteristic curves of equal slope,i.e.

Through Monte Carlo experiments we examine the actual size of various asymptotic procedures for testing the poolability hypothesis, i.e., equal slope vectors across individual equations.

In this paper, further simplifications are suggested for the two-fraction method based on the solubility function and the treatment of fractionation data by using Tung functipn which were proposed by the present authors in previous publications.The evaluation of the distribution parameters for a fraction from two intrinsic viscosity measurements in a good solvent and in a θ-solvent is shown to be not practical, because the required precision is not attainable in ordinary measurements. A new approximation is...

In this paper, further simplifications are suggested for the two-fraction method based on the solubility function and the treatment of fractionation data by using Tung functipn which were proposed by the present authors in previous publications.The evaluation of the distribution parameters for a fraction from two intrinsic viscosity measurements in a good solvent and in a θ-solvent is shown to be not practical, because the required precision is not attainable in ordinary measurements. A new approximation is suggested by taking the phase separation parameter Q to be equal to the volume ratio R of the concentrated and dilute phases. Then, the distribution parameters for the two-fraction method can be readily evaluated. Actual calculations show that the distribution parameters thus calculated is not very sensitive to the value of Q taken, and therefore this approximation is justified as a tentative simplification of the two-fraction method for the determination of molecular weight distributions.In the treatment of ordinary fractionation data by means of Tung function, all fractions except the first and the last ones can be approximated by a straight line for the integral distribution curve. The line passes through the points M(1 = 1/2) = Mη, M(1 = 0) = 1/2Mη which corresponds roughly to a straight line with equal slope as the Tung function at M1/2 with b = 2.7-3.0. This leads to a considerable saving in computation but very slight difference to the result.The suggested simplifications have been applied to a sample of PMMA. The integral distribution curve obtained by the suggested method are closer to the actual one obtained by sedmentation rate method than the usual Schulz-Dinlinger treatment.

This paper discusses some important problems of the design of blasting in dam con- struction by directional explosion. The planning of explosive charges is first mentioned.The effect of blasting order on the shape and height of piling is then discussed,and some principles for the deter- mination of rational order of blasting are outlined: 1.If the slopes of the two opposite river banks are unequal,but the quantities of materials to be projected from them to the dam are equal,then the flatter bank...

This paper discusses some important problems of the design of blasting in dam con- struction by directional explosion. The planning of explosive charges is first mentioned.The effect of blasting order on the shape and height of piling is then discussed,and some principles for the deter- mination of rational order of blasting are outlined: 1.If the slopes of the two opposite river banks are unequal,but the quantities of materials to be projected from them to the dam are equal,then the flatter bank should be blasted earlier than the other. 2.If equal quantities of materials are projected from the two opposite banks of equal slopes,then they should be blasted simultaneously. 3.If the quantity of materials projected from one bank is much greater than that from the other,then the forth bank should be blasted earlier. According to the characteristics and requirements of dam construction,a formula considering the slope effect of ground surface is given for evaluating the weight of ex- plosive charges.And,in order to obtain a rather uniform velocity distribution of the thrown material over the region between charges,a formula for determination of the spacing of the explosive charges is also obtained. Based on the theory of ballistics,with the consideration of all factors,such as para- meters of explosive charge,air resistance and slope of free surface etc.,another formula for calculating the maximum distance of projectiles is given as follows: L_(max)=(A_i~2)/(gW~(2m)F(s))sin2(α—)con~(2m)+(3sin(α-))/(2cos)W. With the same consideration,a method for calculating the piling of projected materials is also presented. Finally,a general idea of how to choose the best scheme of blasting is briefly des- cribed.

We have investigated the decomposition of lauroyl peroxide, 1 in benzene at 30℃, 40℃ and 50℃ and followed the reaction iodometrically. With an initial concentration of 1 between 0.1 to 0.2M and at temperature of 30℃ or 40℃, a first-order plot could be obtained, but the slope increased with the increase of initial concentration (Fig. 1) indicating that some induced decomposition was involved. When the decomposition was carried out at 50℃, a first-order plot could be obtained only when the initial concentration...

We have investigated the decomposition of lauroyl peroxide, 1 in benzene at 30℃, 40℃ and 50℃ and followed the reaction iodometrically. With an initial concentration of 1 between 0.1 to 0.2M and at temperature of 30℃ or 40℃, a first-order plot could be obtained, but the slope increased with the increase of initial concentration (Fig. 1) indicating that some induced decomposition was involved. When the decomposition was carried out at 50℃, a first-order plot could be obtained only when the initial concentration was below 0.04 M, but deviation became apparent with higher initial concentrations (Fig. 1, 2). A kinetic analysis of the data from the experiment at 50℃ gave the results which fit well with a first plus three halves order kinetics (Fig. 3). The first-order rate constant k_1 for spontaneous decomposition was found to be 0.0115 hr~(-1), and the rate constant k_1 for induced decomposition 0.014 mol~(-1/2)·1~(1/2).hr~(-1).-dα/dt=k_1+k_ia~(3/2) (1)When 1 was decomposed in benzene to which the radical scavenger "galvinoxyl" 2 was added, and the progress of reaction monitored by optical density measurements at 434 nm as described by Williams et al, the results showed a first-order reaction with respect to 1 and a zero-order reaction with respect to 2 (Fig. 4). It can be seen from Figure 4 that the straight lines are all nearly parallel with about equal slope, irrespective of the molar ratio between 1 and 2 being changed from 7 to 207, a thirty-fold variation. This means that, in the presence of 2, the induced decomposition was suppressed.From the above results, on the assumption that two radicals were produced from the decomposition of one molcoulo of 1 and that these radicals could be scavenged entirely by 2, the first-order rate constant k_1 was calculated to be 0.0057 hr~(-1), which was just about half the value as determined from iodometric measurements as given above. This implies that only one half of the radicals produced from the decomposition of 1 was scavenged by 2.The carbon dioxide evolved from the decomposition of 1 in benzene in the absence of 2 amounted to about 87％ of the theoretical value. But when 2 was added to the reaction mixture, the amount of carbon dioxide dropped to about 50％.The above results could be interpreted by the following mechanism. In accordance with the general view, the decomposition of 1 proceeded by the fission of O—O bond, followed by the decarboxylation of the resulting RCOO· radicals, producing R· and CO_2.(RCOO)→2RCOO·→2R·+2CO_2 (2) When the decomposition was conducted at 50℃ in the presence of 2, only about one half of the RCOO· radicals decarboxylated and the resulting radicals partly reacted within the cage (c), through disproportionation, recombination etc., and partly diffused into solution to become "free" radicals (d). Thus the free radicals, which were scavenged by 2, would consist at least part of the RCOO· radicals formed. These sequences may be formulated as follows:However, a more tempting and also more tentative interpretation could be put forward as an alternative. Thus when 1 was decomposed in benzene at 50℃, a simultaneous breakage of O—O bond and R—COO linkage took place with the formation of R., CO_2 and RCOO· in one step. Again about one half of the radicals reacted within the cage and the remaining half diffused into solution with the same results. This mechanism may be depicted by the following scheme: However, our results are different from Ward's. Ward et al. studied the decomposition of 1 in o-dichlorobenzene at 112℃ with 2-iodopropane as the scavenging agent and found that no net polarization was observed in the CIDNP spectra for the products. They conclude that the decarboxylation of C_(11)H_(23)COO· must be a very fast process with a life<10~(-10) sec. and cannot be scavenged.Since the experiments by Ward et al. was conducted at 112℃, the extensive decarboxylation of the RCOO· was not surprising. We did the decomposition experiment at 50℃ and it might be that, in the presence of 2, only about one half of the RCOO· radicals decarbexylated under these conditions. The fact that approximately 50％ of the theoretical amount of carbon dioxide liberated supported this contention.In order to ascertain whether the decomposition of 1 undergoes by a stepwise sequence or it may proceed by a concerted mechanism involving the simultaneous breaking of O—O and R—COO bonds, a detailed study of the decomposition products is necessary. Work along this line is being planned.Finally, it should be mentioned that Bawn and Halford have reported early a kinetic study of the decomposition of 1 with DPPH as the scavenging agent. On the assumption that 1 decomposed into two RCOO· radicals and DPPH could capture these radicals with a 100％ efficiency, these authors obtained a value of 0.0078 hr~(-1) for k_1 at 50℃, which is lower than what we have found (0.0115 hr~(-1)) from iodometric determination and somewhat higher than the value (0:0057 hr~(-1)) which we have found by scavenging experiments. In view of the report by Shine et al. that DPPH could cause an induced decomposition of acyl peroxide, it appears that the value reported by Bawn et al. may be a little uncertain.