This paper analyses the approach of intensive utilization of land, points out that there must have the standards of intensive utilization of land and evaluation system, the running rule of market body, the encourage mechanism to pursuing intensive utilization of land, and the effective management of government.

Enterprises' technological innovation must have strong support of information, and enterprises' management can't do without the support of information.

A port which is needed to develop container transportation must have deepwater channels and deepwater berths, specially for the key ports planning for container transportation.

Like other industrial products, GIS products must have quality management and quality control, which make GIS can offer user quality index while offering its products in the future.

DDR SDRAM is a high speed and largecapacity memory,but because of the need of synchronous clock and the characteristic that it is controlled by control command,there must be a controller between the system and DDR SDRAM.

P2PCW use pure P2P technique, which means no central server to participate in the system, such an construction has many differents to other familiar instant message system such as QQ, MSN etc, who must have a logging server.

This paper point out the idea that we must have a suitable and comprehensive software management information system to realize software process control base on deeply analyseing the software enterprise information and the background and key technology of the software process information.

Compared with JMS desk-top applications,the JMS Web application calls for a special customer environment:the same message can be consumed by some unknown users,therefore the message receiver must have a "receive but do not confirm" hand-over mechanism.

The transport of big cities is a multifunctional transport system , especially for the traffic manners of big cities ,they need a diversified and reasonable traffic structure of passenger transport , and must have a great development which accommodate the economic society .

Small and medium-sized enterprise has already become the fresh combatant of China's economy,its development can't be ignored,but it must have enough funds as the guarantee in the course of its development,so its financing problem has received the common concern of the whole society.

To transmit integrated wideband services on HFC it must have the function of advanced network management. But with the developing of HFC technology, there are more and more problems on network management.

One outcome is a simple proof that for $g_{m \alpha , n \beta}$ to span $L^2,$ the lattice $(m \alpha , n \beta )$ must have at least unit density.

The following principle is well-known in Harmonic Analysis: If a real function has a spectral gap at the origin then it must have many sign changes.

Hence, the ore-forming fluids of the Zijinshan subsystem must have been derived mainly from formation water and partly from magmatic water.

It was concluded that the donor must have a lower metabolic rate than the recipient when the involvement of structural elements of the graft is required for healing in skin plastic surgery.

In contrast, when it is necessary to strongly biologically stimulate the reparative processes of the recipient, the donor must have a higher metabolic rate than the recipient.

Then there must be a high-precision control field.

This means that there must be an 'optimum' IFSS which induces the highest tensile strength of the composite.

Therefore, there must be an international legal response as part of the overall response of the international community to terrorism.

Essentially, there must be a reality that exists independently of human consciousness, for consciousness evolved.

In religions, this deadlock is used to illustrate the limits of human reasoning powers and, by the same token, to prove that there must be an ultimate reality which can only be accessed through "revelation", "enlightenment", and the like.

It was concluded that the donor must have a lower metabolic rate than the recipient when the involvement of structural elements of the graft is required for healing in skin plastic surgery.

In contrast, when it is necessary to strongly biologically stimulate the reparative processes of the recipient, the donor must have a higher metabolic rate than the recipient.

In porous electrodes with an immobilized enzyme the substrate must have a high specific surface area, which must be accessible to landing onto it a maximum number of enzyme molecules.

This model must be suitable for practical applications; i.e., it must have a relatively simple algorithm for obtaining a solution and must ensure an accuracy of the numerical values of the calculated quantities that is acceptable for practice.

The matter forming the bridge must have a sufficiently hard and anisotropic equation of state.

The following principle is well-known in Harmonic Analysis: If a real function has a spectral gap at the origin then it must have many sign changes.

This model must be suitable for practical applications; i.e., it must have a relatively simple algorithm for obtaining a solution and must ensure an accuracy of the numerical values of the calculated quantities that is acceptable for practice.

Since in this formula the numeral names are explained by their Babylonian equivalents-and not the other way round-it must have originated in a late period in which the ordinals were already replaced by the Babylonian names.

The magnetic field of the Crab Nebula is so large that if the original pre-super nova star had contained it, it must have been on the verge of instability.

It must have a value greater than unity in order to obtain a simple dynamical origin of the mass difference.

ABSTRACT The validity of the Hammett equation was reexamined in this paper with dissociation constants of anilines as well as phenols.It has been found that for eighty selected pKa values of anilines,seventy of phenols,and twenty one of N,N-dimethyl anilines could be correlated linearly with the substituent constants with satisfactory or excellent results.The ? scale was proposed as a parameter for another type of standard reaction series in which the functional group is capable of donating electrons conjugatively...

ABSTRACT The validity of the Hammett equation was reexamined in this paper with dissociation constants of anilines as well as phenols.It has been found that for eighty selected pKa values of anilines,seventy of phenols,and twenty one of N,N-dimethyl anilines could be correlated linearly with the substituent constants with satisfactory or excellent results.The ? scale was proposed as a parameter for another type of standard reaction series in which the functional group is capable of donating electrons conjugatively instead of withdrawing electrons,as is the case with ? in the dissociation of benzoic acids or with ? in aromatic electropbilic substitution.This parameter in combination with a few σ_(I.R.)~- values can likewise be used for measuring the linear free energy relationships in aromatic nucleophilic substitution reactions.A set of relatively complete σ~- values,of which seventy-eight are primary ?,fifty-four secondary and tertiary ?,eight ? eleven ?,seventy-three primary ? and twenty-three secondary and tertiary ?,are presented.However,values of those sub-stituents with formal charges must be accepted with some reservation.This set of σ-values has been shown to have excellent or at least satisfactory correlations with other sets of closely related σ values.This set of objective substituent constants can also be applied to aromatic nucleophilic substitution not any less adequately than that derived by J.Miller right from this very type of reactions.

A spatial pattern for aphid population during the cotton seedling stage is in agreement with the negative binomial distribution when the percentage of cotton plants infested by the cotton aphid (Aphis gossypii Glover) is less than 5% and it conforms with the Polya-Eggenberger''s contagious distribution when the rate of infestation reached more than 5%. In view of this, we chose the effective period for chemical control at the stage of 20% of infestation.Since there were some difficulties arising from nonnormality...

A spatial pattern for aphid population during the cotton seedling stage is in agreement with the negative binomial distribution when the percentage of cotton plants infested by the cotton aphid (Aphis gossypii Glover) is less than 5% and it conforms with the Polya-Eggenberger''s contagious distribution when the rate of infestation reached more than 5%. In view of this, we chose the effective period for chemical control at the stage of 20% of infestation.Since there were some difficulties arising from nonnormality of error distribution, unequality of the group variance, and or non-additivity of the various effects, and since the original survey data from this investigation on aphid control were not satisfied with the assumptions for the analysis of variance, they must be transformed logarithmically into new values. This normalizing transformation will improve the accuracy of the test. The logarithmic transformation not only accommodates the experience in agricultural and biological experiments, but also conforms with the three basic assumptions underlying the analysis of variance procedure and the related tests of significance. The three basic assumptions are: (1) the experimental error should be normally distributed, (2) all the treatment groups must have the same error variance; and (3) treatment and environmental effects ought to be additive.When the sequential analysis is used to test the right time for controlling aphids, we suggest to give k=0.4, kp1=0.2 kp0=0.1, α=β=0.05, and to formulate two parallel linear equations for acceptance (am=0.143m - 5.7625) and rejection (rm = 0.143m + 5.7625) in carrying out the control measures. Because of its useful saving of labour and materials, these two equations are referable for practical application.