Adopted a high temperature quick extraction technology and a rotary vacuum disk filter with a filter area of 78 m~2in the phosphoric acid plant of 15 kt P_2O_5/a, which was put into production in 1991, and applied some technical measures, the problems of scaling in filter disk and renewing filter cloths frequently are solved.

It is mainly focused on some technical difficulties in developing a subsystem of recognizing isolated word based on MPU, which implies the technology of speech recognition to 3D fish mimicking.

On the basis of comparison between normal and abnormal combustion processes, the characteristics, impair and causes of appearing of above three kinds of abnormal combustion are analyzed in more detail, some technical measures for preventing abnormal combustion are introduced.

Some technical tips are described on how to improve the discrimination between perfect and imperfect duplexes formed by hybridization of fluorescently labeled oligonucleotides to biological microchips.

In addition, some methods employed in the field as well as some technical problems are discussed in the paper, together with the means of obviating them.

These apparatuses combine the merits of plug-flow tubular reactors and stirred continuous reactors and have some technical and technological advantages.

Some technical and technological aspects of development, design, and safe operation of an artificial tritium source with an antineutrino activity of 40 MCi for experiments to measure the neutrino magnetic momentum are considered.

Some technical details in the procedure for calculating the critical distance Rcr in the relativistic problem of two Coulomb centers are described.

In this paper we briefly review the existing types of large radio telescopes and sug- gest certain principles to be considered in future design.With these in mind,a new type of telescopes is proposed.This consists of a large central paraboloid and a number of outer rings of discrete antenna elements. Fig.1 shows the arrangement of the paraboloid and one ring.When the two are connected by “correlation technique”,the resulting radiation pattern will be D∞F_1F_2, where F_1,F_2 are the field patterns of the paraboloid...

In this paper we briefly review the existing types of large radio telescopes and sug- gest certain principles to be considered in future design.With these in mind,a new type of telescopes is proposed.This consists of a large central paraboloid and a number of outer rings of discrete antenna elements. Fig.1 shows the arrangement of the paraboloid and one ring.When the two are connected by “correlation technique”,the resulting radiation pattern will be D∞F_1F_2, where F_1,F_2 are the field patterns of the paraboloid and the ring respectively.By suitably chosing the radius of the paraboloid R_0,the radius of the ring α,and the number of elements in the ring n (R_0 and a being expressed in unit of the working wavelength), one may neglect the influence of the “secondary patterns” in F_2 (which occurs because the aperture of the ring is not full,but discrete).The Fourier transform of D∞F_1F_2 will then be expressed by equation (22) and shown in Fig.3,in which we take the radia- tion pattern of the paraboloid to be represented by Λ_2~2 (2πR_0r). When there are N rings with radii α_1=β_1R_0,α_2=β_2R_0,……,α_N=β_NR_0,and when they are connected with the central paraboloid by “correlation technique”,the radiation pattern will be D(r)=C_0[Λ_2(2πR_0r)]~2+CΛ_2(2πR_0r)[A_1J_0(2πα_1r)+A_2J_0(2πα_2r)+ +……+A_NJ_0(2παNr)],(26) where C_0,C,A_0…A_N are constants.The transform of D(r) is then expressed by equa- tions (37),(23),and (27),and may be adjusted to the form as shown in Fig.5.We see from the figure that the curve has nonzero values between the zero spatial frequency and the high frequency cut-off.Hence by the principle of “convolution correction” as pointed out by Wild in [11],the pattern may be “transformed” into a desirable one when a correcting function G is applied. To obtain such a curve as in Fig.5,that is,a curve with nonzero values below cut-off,one may choose the parameters β_m=α_m/R_0(m=1,2,…,N) so that the individual Fourier transforms corresponding to the paraboloid and successive rings will overlap in certain spatial frequency ranges.With this condition and the consideration of economy of arrangement,we may determine β_m and hence n_m [eq.(30)]. Table 1 gives the values of β and n as required in such design.In the sixth column of the table,we also give the half-power beam widths of the resulting patterns when they are corrected to Λ_1~2 (2πR_1r),where R_1=(β_N+1)R_0/2 (unit:R_0/2 minute of arc). For the sake of illustration,we take the total number of the rings N as 6.Denote the Fourier transform of radiation pattern D by (?),which curve is sketched in Fig.5. In the figure,the amplitude of (?) being modified to conform with the curve (?)_1~2 in order to suppress secondary lobes.The reverse transform of (?) is shown in Fig.6,which is the resulting radiation pattern.From it we see that the half-power beam width is about (200/R_0)′,the secondary lobe is tolerable,but rather broad. For correcting the pattern to Λ_1~2 (Fig.9),one has to find the correcting function G. As was done by Wild in [11],we have calculated the functions (?)=(?) and G in the case of zenith distance z=0.(Figs.7 and 8) Such calculations may be extended to other zenith distances,but the mathematics will be much more tedious. This type of radio telescope has the following essential characters: (1)It may be looked upon as the extension of a large paraboloid in the sense of improving the resolution and the collecting area.The field of application is wider than most of the usual types of large radio telescopes. (2)The system of antennas is good for wide range of wavelength variation. (3)At any stage,it always permits further developement by addition of outer rings. (4)It is advantageous to have the central paraboloid as large as practicable,since the resolving power is proportional to the factor (β_N+1)R_0.For given β_N,the total num- ber of elements required in the rings is the same for any R_0. (5)Away from the zenith,while the resolution in horizontal direction remains the same,that in vertical direction gradually deteriorates with the ihcrease of zenith distance. For N=6,the main lobe expands 1.8 times at z=60°,and 3.2 times at z=75°. (6)Beam swinging and scanning present some technical difficulties Owing to the path differences between different elements being functions of both azimuth and eleva- tion. (7)The “convolution corrections” of the radiation pattern are different for dif- ferent zenith distances.

There are some technical problems in the synthsis of M.N.A.: (1) The end-point of reaction: the heat of reaction is utilized forthe indicating-scale. (2) Making the product either liquid or semi-solid, The presence oftrace solvent in the M.N.A. product is the main factor, the liquid or ?emi-solid form depends on the sweeping with or without nitrogen(orair). (3) The colour of product depends on the temp. of vaccum distil-lation: If the temp. is over 100℃, it turns to yellow, and above 130℃the colour will...

There are some technical problems in the synthsis of M.N.A.: (1) The end-point of reaction: the heat of reaction is utilized forthe indicating-scale. (2) Making the product either liquid or semi-solid, The presence oftrace solvent in the M.N.A. product is the main factor, the liquid or ?emi-solid form depends on the sweeping with or without nitrogen(orair). (3) The colour of product depends on the temp. of vaccum distil-lation: If the temp. is over 100℃, it turns to yellow, and above 130℃the colour will become brown. Because of trace methyl-cyclopenta-diene(dimer) in the heating, it turns to brown resin by acidic catalysis.

In this paper, attempts were made to highlight some of the basic experiences in both technical as well as economic progresses in their courses of agricultural modernization in the advanced industrialised countries and to put forth the national targets for agricultural modernization in the PRC. Rudimental situations and constraints in labour force, capital, energy source, technological level and time requirement between the advanced industrialised countries and the PRC were compared and the possible orientation...

In this paper, attempts were made to highlight some of the basic experiences in both technical as well as economic progresses in their courses of agricultural modernization in the advanced industrialised countries and to put forth the national targets for agricultural modernization in the PRC. Rudimental situations and constraints in labour force, capital, energy source, technological level and time requirement between the advanced industrialised countries and the PRC were compared and the possible orientation and some technical and economic policies for the Chinese agricultural modernization/mechanization in the PRC were formulated for further discussion and reference. In the mean time, characferistics of various models of agricultural modernization/mechanization were tabulafed and their differences stressed.