Facing the social development and competition in the future,we must take the qualified person of talent of the 21th century as our aim,deepen the reform of education teaching,rethink the traditional education ideas and teaching modes,and try to probe the teaching modes and methods that can arouse and improve the students' enthusiasm and creative spirits in their studies.

To construct such society, we must take the credit construction as the moral foundation ,take the democracy and rules of law as the political security, take the market economy as the economic base, take the harmonious culture as the mental foundation,and take the human and natural harmony as the symbiosis carrier.

In order to improve effectiveness of moral education, we must take into account entirely the harmonious development of rational and irrational factors.

After our country's entering the WTO,food industry in Heilongjiang is faced up with both opportunities and challenges,so we must take international market as the direction,establish and adjust the effective supply and demand structure of the food industry,develop the export-oriented food industry and participate in the competition of the international market actively.

To enhance the construction of enterprise culture effectively,we must take the innovations as the direction of the construction of the enterprise culture,and form the values,in which innovations are advocated.

Conclusion:In order to reduce the neonatal complications,we must take the expectation treatment to prolong the pregnant period in pregnancy for 28～35 weeks of PPROM.

In order to realize the overall development of human society and science and technology,we must take efforts to cultivate modern moral civilization and the right view of value for imformation ethics.

The paper analyses the present status of our young teachers and points out what measures we must take in order to promote the rapid growth of young teachers.

In general we must take in account the influence ofStefan's flow by calculating the wash-out efficiency.

From a study of lining wear in metallurgical furnaces it follows that we must take into account the possibility of diffusion of the isotope into the refractory.

It is pointed out that in investigating pulsar magnetospheres, we must take into account the effect of rotating relativistic stream braking.

In this case the effect of inertia forces can be neglected.3.In determining the ratio of the colliding masses we must take into account the indirectness of impact.

Nevertheless, in order to get a better grip in this new century on how ATP synthases make ATP and then release it, we must take on the difficult challenge of elucidating each of the three levels of mechanism.

The band width of the ionic crystals with small mobility is so narrow, that suppling some impurities in the crystals deviates the periodic potential and the concept of ideal crystals is not applicable. For such crystals we must take H-L approach. In this work we calculated the mobility of the carriers, and refined the method of colculating the transition probality due to the fluctuation of impurity potential.

In this paper we suggest a new method for the calculation of thedepth of line formation in a magnetic field.The concepts of the equivalent line absorption coef- ficient k_l~* and the equivalent source functions S_Q~*,S_U~*,S_V~* are introduced.The cor- responding optical depth is determined by Equation (6).Our method is the solution of Equation (7)and Equation (9) together with the radiative transfer equations in a magnetic field.Then we calculate the normalized contribution functions F_I, F_Q,F_U,F_V and the...

In this paper we suggest a new method for the calculation of thedepth of line formation in a magnetic field.The concepts of the equivalent line absorption coef- ficient k_l~* and the equivalent source functions S_Q~*,S_U~*,S_V~* are introduced.The cor- responding optical depth is determined by Equation (6).Our method is the solution of Equation (7)and Equation (9) together with the radiative transfer equations in a magnetic field.Then we calculate the normalized contribution functions F_I, F_Q,F_U,F_V and the depth ι(or h) of line formation in a magnetic field from Equa- tion (3),Equation,(4),Equation (11) and Equation (12).Calculations of F and ι(or h)require the same conditions as for the solution of the radiative transfer equation.Namely,we use the same atmospheric model,absorption mechanism, boundary conditions etc. At last calculations have been Performed for several concrete cases (see Table 1). The following conclusions have been drawn:(1) In the calculations of the depth of line formation in a strong magnetic field we must take into account the effect of the magnetic field;(2) The depths ι_I、ι_Q、ι_U and ι_V of line formation are unequal.

本文提出磁场中谱线形成深度的新的计算方法.文中引进等值线吸收系数 x_l~*和等值源函数 S_Q~*、S_U~*、S_V~*的概念后,和磁场中的辐射转移方程一起求解.再计算磁场中的规一化的贡献函数 F_I、F_Q、F_U、F_V 和谱线形成深度ι_I、ι_Q、ι_U、ι_V.这样算出的 F 和ι(或 h)是与解辐射转移方程的条件相同,即有相同的大气模型、吸收机制和边界条件等.由本文计算的几个实例(表1)得出:(1)在强磁场中计算谱线形成深度必须考虑磁场的作用,(2)谱线形成深度ι_I、ι_Q、ι_U、ι_V 是不相等的.

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