To deal with the establishment of open education teaching process in modern distance and several problems to supervise the teaching quality,we must do as follows:accomplishing our duties with all heart;

In order to make the investment control play its due role in engineering construction, we must do well investment estimate in decision-making stage of the project, control the quality of general estimate of the design strictly, and draw up a construction drawing- budget carefully.

In order to make the best use of its information resources, we must do more research on the avenues to, the methods of and the problems of the exploitation and utilization of its information resources.

Conclusions We must do so many work as carry on primary prevention on dangerous factors of cerebral infarction,it is very important that to prevent cerebral infarction recurrerce.

In the field of post and communication, the papers about appli- cation of the theory of quality control are seldom seen. This paper discusse the problem of application of quality control, especially the control chart in the field of post and communication. Due to fluctuations of the quantity of demand, in applying control chart, we must do regression analysis of the quality index and the quantity of demand. If the regression is significant, then we must use the selecting control charts proposed...

In the field of post and communication, the papers about appli- cation of the theory of quality control are seldom seen. This paper discusse the problem of application of quality control, especially the control chart in the field of post and communication. Due to fluctuations of the quantity of demand, in applying control chart, we must do regression analysis of the quality index and the quantity of demand. If the regression is significant, then we must use the selecting control charts proposed by the author. Otherwise, the Shewhart's control charts can be used. From the viewpoint of the theory of queue, the system of post and comnun- ication is a system of queue. Hence, the problem that the quality index and the quantity of demand is correlated or not, under the given conditions and within certain limit of the quantity of demand, depend on the characteristics of the system of queue. If the system is of random arrival and service in batch, then it is not correlated in general; if the sgstem is of random arrival and service in order (including the case with priority), then it is correlated in general. The theory presented in this paper has succeeded in the control of over-limit rate and register return rate of long-distance telephone, and begin to be used in Peking, Shenyang and Hupei etc, According to the statistical data in practice, the accuracy of allarm of this selecting control chart is about ten times higher than the Shewhart's control chart. As to the maintenance, this paper lays stress on the importance of correctve maintenance that is cortrolled by the method of quality control. At the end of this paper, it is pointed out that the feature of the industry of post and communication is "more variety, less quantity". Hence it is effective to apply unitedly the same control chart for different cases, provided that the com- mon points in production is grasped. In this paper, many practical examples solved by the author are also included which may be of use to the reader for reference.

During his visit to Beijing, G. R. Burbidge reaffirmed their view point: the statistical distribution of observed number of QSOs versus it's redshift (figure of N-Z) has three peaks nearly at Z≈0.5, 1.5, 2.0 (ef. Fig. 1). Though their statistical analysis based directly on the observation is model-independence, it has no apparent physical meaning. In order to give physical meaning to the relevant quantities, it is necessary to have recourse to cosmological model. Basing on Friedman's model, we have done the...

During his visit to Beijing, G. R. Burbidge reaffirmed their view point: the statistical distribution of observed number of QSOs versus it's redshift (figure of N-Z) has three peaks nearly at Z≈0.5, 1.5, 2.0 (ef. Fig. 1). Though their statistical analysis based directly on the observation is model-independence, it has no apparent physical meaning. In order to give physical meaning to the relevant quantities, it is necessary to have recourse to cosmological model. Basing on Friedman's model, we have done the statistical analysis of 1467 QSOs collected in Burbidge's catalog, then obtained the luminosity evolutionary law of QSOs and the statistical distribution of its number versus the luminosity distance.In Friedman's model, the redshift is naturally related to the luminosity distance:Here H0 is Hubble 's constant, and q0 the deacceleration parameter. Considering that it is recently discoved that the neutrino has rest mass, we only take account of two typical quantities of q0: i.e. q0= + 1 (closed universe) and q0 = 1/2 (flat universe).The vertical axis N in Fig. 1 represents the observed number of QSOs (apparent magnitude m≤21). In order to obtain the distribution of actual number (relative ratio), we must do some reasonable correction. According to the relation between apparent magnitude and luminosity distance :m = M + 5 log dL ?5. (2)we know that the more distant the QSOs are, the less the observed number of QSOs is Therefore, we ought to do number counting after removing all of QSOs at the same distant. Because there are a few of QSOs with largest redshift (Z≈3.5) in Burbidge's catalog, the reference position is chosen at Z=3.0. The apparent magnitude of QSOs after removing them to the position corresponding to Z= 3.0 is called "reduced magnitude" m'. From Bq. (2), we haveSince there is only one of QSOs which m' > 21 in the catalog, we choose the visual limit as 21. If m' < 21, it is counted ; if m' > 21, it is not counted.In addition, we must take acount of luminosity evolution. We must analyse statistically the luminosity distribution of QSOs at different intervals of Z. At first, we count the number of QSOs within the intervals Am = 0.5 and AZ = 0.05. Then, we draw the figures of normalized number counting versus apparent magnitude (cf. Fig. 2). The result reveals that all of Figs. N/Nmax--m at different Z are appeared to have the same shape (normal distribution), especially appear a common peak at m≈1819 (except for Z < 0.3). This suggests that the luminosity evolution of QSOs just compensates the decrease of it's luminosity with distance, so that the apparent magnitude of QSOs at different distance appear the same distribution.Hence, if we take m in Eq. (3) as correspondent constant, and substitute Eq. (1) into Eq. (3), we would obtained the relation between the reduced magnitude of QSOs and redshift Z. For the QSOs at peak, this relation is more accurate, and is written as following:(i) for q0= 1,m = 5 log 3/Z + 18 (4a)(ii) for q0= 1/2, In Friedman's model, it is easily to derive the relations between cosmological time t and redshift Z as following:(i) for q0 = 1,(ii) for q0 = 1/2,Combining the Bqs. (4a, b) and (5a, b), we ultimately obtained the evolutionary law of reduced magnitude of QSOs at peak. For the case of q0 = 1/2, we haveThe curves shown in Fig. 3 represent the theoretical formula above obtained, in which the vertical line segments represent the observed peaks of reduced magnitude of QSOs at different, Z (the interval is chosen as 0.05). The corresponding t are marked in the horizontal axis. (II0 is chosen as 100 km/see kpe.) It is apparent that the observed data is well fit. to the theoretical curves.Because the luminosity evolution of QSOs just compensates the decrease of its luminosity with distance, the observed number of QSOs is also its actual number (relative ratio). The intended correction mentioned at begining is not necessary. Therefore, it is concluded that the Fig. 1 given by Burbidge also represents the actual number distribution of QSOs versus its luminosity distance, provided that

In this paepr,the effect of flood retaining of forests have been analyzed in the way of hydrology.The main points are as follows. ①The factors influencing flood retaining of forests are very miscellane- ous.Besides the features of forest itself,what is the most important is the thickness of the soil layer of aeration zone(abbreviated“soil layer”in the following).This is the main reason why the capacities of flood retaining of forests are in great change in different areas. ②The type of runoff generation is related...

In this paepr,the effect of flood retaining of forests have been analyzed in the way of hydrology.The main points are as follows. ①The factors influencing flood retaining of forests are very miscellane- ous.Besides the features of forest itself,what is the most important is the thickness of the soil layer of aeration zone(abbreviated“soil layer”in the following).This is the main reason why the capacities of flood retaining of forests are in great change in different areas. ②The type of runoff generation is related to siol layer;When soil layer is comparatively thin,the runoff generations can be evaluated according to he model of runoff formation at the natural storage.And the type of runoff generation of very thick soil layer on forest land belongs neither in the model of runoff formation at the natural storage nor in the model of runoff formation in excess of infiltration because under this conditions the soil layers can not be filled up with water.Hence it is a special type of runoff formation. ③The capacity of flood retaining of watersheds(regardless of water- sheds forested or not)can be shown by the maximum water storage of water- shed(Im).Where a storm rainfall amount(or a continuous one)is given by the signal x,the index of antecedent soil moisture by the signal Pa,then the effect reducing flood of watersheds will reduce with the increaing of ratio (X+Pa)/(Im). In accordance with above analysis for the mechanism of flood retaining of forests,it can be considered that in Qin-ba mountainous regions,water- sheds(forested)are possessed of a certain effect of flood retaining in early period of the flood,Which occurred in August,1981(abbreviated“81.8” flood in the following)and they,however,are not possessed of their effect of flood retaining in the late period of the“81.8”flood,because the value Im is low due to thin soil layer in spite of being forested. As for problems of flood control in Hanzhong District,undoubtedly comprehensive means and overall planning must be used in the flood control. And now the first thing is that we must do well the planning,construction and the management of river dykes.