In the last two decades of the twentieth century, Internet emerged, developed and boomed, which made deep impressions on almost every aspect, such as the world politics, economics, cultures and human life.

The other two H2O molecules combine moderately with central MgCl2 , the bond lengths of R[ O-Mg] are 0. 214 2 nm, 0. 215 2 nm, respectively. The last two H2O molecules combine tightly with central MgCl2, the bond lengths of R [O-Mg] are both 0. 208 1 nm, which means it is hard to be removed.

Results The average PR of staphylococcus, pneumococcus and colibacillus were 26. 25 % , 22. 60 % and 22. 57 % , and the average SI were 4.72,3.70 and 3.53 respectively, the average PR and SI of last two kinds of bacteria were much lower than at of staphylococcus (P<0.05).

The test research on five types of catalysts shows that all these catalysts of YD5-51,YD5-52,SAPO-11 and ZSM-35 have high activity ,and the last two ones have good selection.

We use five index to appraise the temperature susceptibility of the eight asphalt material, such as PI, PVN25-60 , C. I, PVN25-135 and VTS. Among these index, the results of first three kinds are very close, the last two kinds have small differences with the first three kinds, the overall trend is similar.

Results The tumor volume of control, 5-FU, magnetic nanoparticles and Gemcitabine groups was (2256.1±267.1) mm3, (2096.5±237.9)mm3,(1392.2±189)mm3, and (1534.9±115 )mm3 respectively. The last two groups have significant difference compared to the first two groups(P<0.05).

155 strains of El Tor biotype of O1 serogroup(EVC)were divided into four types(class,ET,class+ET,class+new ET). The last two types were the first time found in these areas.

The models of diabetic nephropathy were established in the last two groups by 65 mg/kg streptozotocin and 2 u long-acting insulins was injected the next day.

The main part of the work deals with abstract Higgs bundles; in the last two sections we derive the applications to Higgs bundles valued in a line bundle K and to bundles on elliptic fibrations.

An array of complicated structures of the natural products synthesized over the last two years is also listed to serve as a convenient lead to the original literature for the prospective interested readers.

This paper reports the measurement of the Neodymium isotopic composition by Neptune Multiple Collector Inductively Coupled Plasma Mass Spectrometry (MC-ICP-MS) over the last two years.

There are two model outputs, where either the first two characters form a word or the last two characters form a word.

Methods for obtaining sign-changing solutions developed in the last two decades will also be briefly revisited.

Wang's theory for determining the approximate configurational partition function of the adsorbed layer is modified in two different ways. One is to assume that the configurational energy should be corrected: the other to advocate that the deficiency due to a wrong expression for the a priori probability of the. central site is more significant.The configurational partition function is evaluated is both methods and the adsorptipn isotherin and the beat of adsorption computed for the case of quadratic lattice...

Wang's theory for determining the approximate configurational partition function of the adsorbed layer is modified in two different ways. One is to assume that the configurational energy should be corrected: the other to advocate that the deficiency due to a wrong expression for the a priori probability of the. central site is more significant.The configurational partition function is evaluated is both methods and the adsorptipn isotherin and the beat of adsorption computed for the case of quadratic lattice With dipole interaction. values for the last two quantities when a uniform continuous distribution of the distant adsorbed particles is assumed are further given for comparison. The second method, which surpasses the first, is compared with Kirkwood's method. in the case of hexagonal lattice with neighbour interaction. Numerical work is also carried out in this case.

Integrating with respect to time the equation for the balance of angular momentum of the atmosphere north of certain latitude (30°N say)we obtainIn the above equation ρ is thedensity; (?), the zonal wind; v, the meridional wind; R, the earth's radius; Ω, the angular speed-of the earth's rotation; dm, the mass element of the atmosphere; dτ, the volume element; ds, the area element on the earth's surface, and dσ, the urea element on the vertical surface over the latitudial circle of 30°N. The first two terms (in...

Integrating with respect to time the equation for the balance of angular momentum of the atmosphere north of certain latitude (30°N say)we obtainIn the above equation ρ is thedensity; (?), the zonal wind; v, the meridional wind; R, the earth's radius; Ω, the angular speed-of the earth's rotation; dm, the mass element of the atmosphere; dτ, the volume element; ds, the area element on the earth's surface, and dσ, the urea element on the vertical surface over the latitudial circle of 30°N. The first two terms (in the parenthesis) On the left side of (2) are evaluated from the mean westerlies in summer and winter given by Mintz. The last two terms on the left and the first two terms on the right side of (2) are evaluated from the mean surface pressure charts of July and January. The transfer of angular momentum across latitude 30°N given by Starr and White is used to evaluate the 3rd. term on the right. Then the value of the last two terms in the parenthesis on the right of (2) is calculated. The result agrees very well with that obtained by other authers.It is further found that: 1. From summer to winter the transfer of angular momentum from low to high latitudes by gross weather systems overcompensates the destruction by the earth's surface. The small residue of these two factors acounts for the main part (about85%)of increase of westerly circulation from summer to winter. The remaining small part of the increase of the westerly circulation may be acounted for by the advection of mass of the atmosphere, which carries the angular momentum due to earth's rotation (difference between the first two terms on the right and the last two terms on the left side of (2)).2. The transfer of angular momentum or the destruction of angular momentum, as well as the intensity of the westerly circulation has annual variation. However this annual variation is not of sine or cosine type, i,θ, the variation from summer to winter is not the opposite of that from winter to. summer. The property of this asymmetry is explained by the irreversible heat addition and subtraction. From winter, to summer heat is added to, and summer to winter heat is subtracted from the atmosphere (N.H.). Since the process of adding and subtracting heat is irreversible, the variation from summer to winter can not be symmetric to that from winter to summer.3. Transfer of angular momentum from easterlies to westerlies occurs mainly in the period of breakdown of zonal circulation (low index), mainly in the belt of longitudes of"extended troughs" (troughs extending from high to low latitudes) and "extended ridges" (ridges extending from low to highlatitudes), and mainly in the high levels of the atmosphere.

Fineness modulus (F. M.) has served as an index of fineness of aggregates since it was first introduced by Prof. Duff A. Abrams in 1918. In the concrete mix design, the F. M. of sand governs the sand content and hence the proportions of other ingredients. But there are undesirable features in F. M.: it does not represent the grading of sand and manifests no significant physical concept.Prof. suggested an "average diameter" (d_(cp)) in 1943 as a measure of fineness of sand. In 1944, d_(cp) was adopted in 2781-44...

Fineness modulus (F. M.) has served as an index of fineness of aggregates since it was first introduced by Prof. Duff A. Abrams in 1918. In the concrete mix design, the F. M. of sand governs the sand content and hence the proportions of other ingredients. But there are undesirable features in F. M.: it does not represent the grading of sand and manifests no significant physical concept.Prof. suggested an "average diameter" (d_(cp)) in 1943 as a measure of fineness of sand. In 1944, d_(cp) was adopted in 2781-44 as national standard to specify the fine aggregate for concrete in USSR. It was introduced to China in 1952 and soon becomes popular in all technical literatures concerning concrete aggregates and materials of construction.After careful and thorough investigation from ordinary and special gradings of sand, the equation of d_(cp) appears to be not so sound in principle and the value of d_(cp) computed from this equation is not applicable to engineering practice. The assumption that the initial average diameter (ν) of sand grains between consecutive seives is the arithmetical mean of the openings is not in best logic. The value of an average diameter computed from the total number of grains irrespective of their sizes will depend solely on the fines, because the fines are much more in number than the coarses. Grains in the two coarser grades (larger than 1.2 mm or retained on No. 16 seive) comprising about 2/5 of the whole lot are not duly represented and become null and void in d_(cp) equation. This is why the initiator neglected the last two terms of the equation in his own computation. Furthermore, the value of d_(cp) varies irregularly and even inversely while the sands are progressing from fine to coarse (see Fig. 4).As F. M. is still the only practical and yet the simplest index in controlling fineness of sand, this paper attempts to interpret it with a sound physical concept. By analyzing the F. M. equation (2a) in the form of Table 9, it is discovered that the coefficients (1, 2…6) of the separate fractions (the percentages retained between consecutive seives, a1, a2…a6) are not "size factors" as called by Prof. H. T. Gilkey (see p. 93, reference 4), but are "coarseness coefficients" which indicate the number of seives that each separate fraction can retain on them. The more seives the fraction can retain, the coarser is the fraction. So, it is logical to call it a "coarseness coefficient". The product of separate fraction by its corresponding coarseness coefficient will be the "separate coarseness modulus". The sum of all the separate coarseness moduli is the total "coarseness modulus" (M_c).Similarly, if we compute the total modulus from the coefficients based on number of seives that any fraction can pass instead of retain, we shall arrive at the true "fineness modulus" (M_f).By assuming the initial mean diameter (ν') of sand grains between consecutive seives to be the geometrical mean of the openings instead of the arithmetical mean, a "modular diameter" (d_m), measured in mm (or in micron) is derived as a function of M_c (or F. M.) and can be expressed by a rational formula in a very generalized form (see equation 12). This equation is very instructive and can be stated as a definition of mqdular diameter as following:"The modular diameter (d_m) is the product of the geometrical mean ((d_0×d_(-1))~(1/2) next below the finest seive of the series and the seive ratio (R_s) in power of modulus (M_c)." If we convert the exponential equation into a logarithmic equation with inch as unit, we get equation (11) which coincides with the equation for F. M. suggested by Prof. Abrams in 1918.Modular diameter can be solved graphically in the following way: (1) Draw an "equivalent modular curve" of two grades based on M_c (or F. M.) (see Fig. 6). (2) Along the ordinate between the two grades, find its intersecting point with the modular curve. (3) Read the log scale on the ordinate, thus get the value of the required d_m corresponding to M_c (see Fig. 5).As the modular diameter has a linear dimension with a defin