Results The structure and absolute configuration of the product obtained was studied by MS, H 1nmr. It was proved that construction and configuration of the compound obtained is [1R-(1α,2α,3β)]-4-carbonyl-podophyllotoxin.

The definition of weak implication Algebra on a partial ordered set was introduced. It was proved that weak implication algebra satisfying the condition(x→y)→y =(y→x)→x forms MV-algebra and weak R_0-algebra.

A good peak of thallium is obtained in a solution of 0.08M citric acid-0.02M EDTA-5×10~(-5)MEg(NO_3)_2(pH6) by JP-MI pulse polar-raphy with glassy carbon electrode.

After several year operation at the field test site, it was demonstrated that this device is stable and sprinkling homogeneous, with the rainfall intensity from 2 mm/h to 100 mm/h and the low limit of 2 mm/h.

DPX - 3300 draught machine can draw the size of figure is 8400 mm × 594 mm. In practice,it is proved that it can draw the size of plane figure is 1680 mm × 590 mm.

DPX—3300绘图机原绘制的图幅为8 400 mm ×594 mm，经过实际证明它能够绘制的图幅为 1680mm×590 mm的平面图。

In this paper, we consider the Marcinkiewicz integral operator with rough kernel defined by where and prove that is bounded on the Herz spaces (K|·)qa,q as well as bounded from (K|·)1q,p to WK1q,p under certain sufficient conditions.

Structural studies demonstrated a substitution of Glycine by Lysine occurring at position 26 of β-chain. Thus the mutant is identified as Hb-E α_2β_2 26 (B_8) Glu-Lys.

By use of special wavelet bases associated to accretive or pseudo-accretive functions, it was proved that all Calderón-Zygmund operators satisfying certain conditions form an algebra.

It was proved that the cluster results were equivalent in dataset with two different cluster algorithms: WFCM and FCM.

It was proved that the cross-linking reaction between HPAE and SA followed a two-step mechanism.

It was proved to be operable if the controlled plant is subjected to the action of unmeasurable bounded perturbations.

Razumikhin, it was proved that if the right-hand sides of these equations are free of the linear terms relative to the phase variables, then the asymptotic stability is retained for any delay.

Some of the viewpoints held by Prof. Chwang Chien-ting in his paper "The Fusion Point of Ash of Chinese Coals" (this journal, 1957, 2, No. 2, 114) are quite worthy to notice and discuss. 1. The assumption made by Prof. Chwang concerning the composition of coal ash cannot be warranted. In fact, the various ingredients of coal ash originate from very complicated mineral matters. Thus the assumption that coal ash is simply composed of the various metallic oxides mechanically mixed is unjustifiable. Prof. Chwang...

Some of the viewpoints held by Prof. Chwang Chien-ting in his paper "The Fusion Point of Ash of Chinese Coals" (this journal, 1957, 2, No. 2, 114) are quite worthy to notice and discuss. 1. The assumption made by Prof. Chwang concerning the composition of coal ash cannot be warranted. In fact, the various ingredients of coal ash originate from very complicated mineral matters. Thus the assumption that coal ash is simply composed of the various metallic oxides mechanically mixed is unjustifiable. Prof. Chwang further postulated that when SiO_2/Al_2O_3=1.17 (i.e. the relative amounts of SiO_2 and Al_2O_3 in ash conform to the composition of kaolin Al_2O_3·2SiO_2·2H_2O and no free SiO_2 is present), the increase of percentage of metallic oxides in ash will not reduce the fusion point of the ash as there is no free SiO_2 to combine with the metallic oxides to form low-melting silicates. However, this postulation is inconsistent with the statement of the original paper and. also disproved by the experimental results. 2. For the same SiO_2/Al_2O_3 ratio, the increase of content of metallic oxides b(=Fe_2O_3+CaO=MgO=K_2O=Na_2O) in ash usually reduces the fusion point of the ash. But our experimental results show that when b exceeds 35％,the fusion points are higher than those for b equal to 30％. 3. For the same SiO_2/Al_2O_3 ratio, the fusion point of the ash increases with R(=SiO_2/Al_2O_3/Fe_2O_3+CaO+MgO+K_2O+Na_2O);when R is of approximately the same value, the smaller the SiO_2/Al_2O_3 ratio, the higher will be the fusion point. When R approaches or is smaller than 1, the fusion point shows no definite regularity, irrespective of the variation of SiO_2/Al_2O_3 ratio. 4. In the whole range of the coalification series, the content of volatile matter can represent neither the composition of the coals themselves, nor that of the ashes, hence it bears no relation with the fusion point of the ash. From the experimental results, no clear correlation can be found between the sulfur content and the iron content in ash, so that the fusion point is not closely related with the sulfur content of the ash. The influence of SiO_2 on the fusion point of coal ash is still uncertain and disputable, pending further investigation and verification.

This paper attempts to answer the following two questions: (1) Is it possible to derive the law of distribution of hydrological frequency theoretically(2) What type of distribution curve should be adopted as the model of hydrological frequency curve and how to determine their parameters? The results obtained may be summarized as follows: 1. Hydrological phenomena are time series with concealed periodic fluctuations. The results from statistical analysis based upon the current assumption that hydrological phenomena...

This paper attempts to answer the following two questions: (1) Is it possible to derive the law of distribution of hydrological frequency theoretically(2) What type of distribution curve should be adopted as the model of hydrological frequency curve and how to determine their parameters? The results obtained may be summarized as follows: 1. Hydrological phenomena are time series with concealed periodic fluctuations. The results from statistical analysis based upon the current assumption that hydrological phenomena are independent stochastic variables should be accepted with due considerations. 2. In view of the regional nature of hydrological phenomena, the current parctice of analyzing samples taking from a single station only is, in effect, to narrow the sampling field arbitrarily from a larger area to a point, thus reducing the accuracy of the statistical results. Hence, the synthetic utilization of the data of all stations within the hydrologically homo- geneous region is an important measure to increase the accuracy of statistical analysis. 3. The belief that the flood frequency obeys the binomial theorem or Poisson's theorem is but to mix up the priori with the empirical probability problem. The binomial theorem, being a powerful weapon to deal with the problems of priori probability, has not been adquately and properly utilized in the hydrologieal frequency analysis. 4. Analyses have been made of the nature of distribution of shydrologieal series on the basis of Kaptyen's derivation of the skew distribution, which indicate: (1) That the theoretical interpretation of the log-probability law of the hydrologic phenomena by V. T. Chow is not sound; (2) that hydrologic phenomena being results of very complicated meteorological and hydrological processes, it is impossible to derive theoretically the law of distribution for the hydrological series. 5. The view that the flood frequency obeys the Gumbel's distribution is theoretically not sound and also not verified by actual data. 6. According to the nature of the mathematical treatments applied, the method of description of the empirical probability can be classified into three systems: (1) The methods of the generalization of the characteristic factors of the distributions, such as Pearson's curves, Goodrich's curves, etc.; (2) The methods of the modification of a fundamental distribution by series and polynomials, such as Gram-Charlier curves. curves, etc.; (3) The methods of transformed functions, such as the log-probability law, curves, etc. It should be remarked that not only Pearson's and Goodrich's curves are frequency curves of empirical nature, but even the theoretical laws, such as the normal law and the log-probability law, will be aceepted as curves of empirical nature, when used as models for empirical probability problem. 7. Hydrological frequency analysis should not be mystified and made absolute. Instead of free selections, the models of hydrological frequency curve should be uniquely selected and specified. Statistical parameters should be determined not solely by the short period data of single station, but also by the synthetic utilization of the data of possible more stations. 8. It is recommended that one of the two types of distribution, i.e. the log-normal frequency curve with both sides limited and the Pearson's type Ⅲ curve, may be selected as unified models. The author suggests that the K-value corresponding to recurrence intervals of say 10~4, 10~5, or 10~6 years may be selected as the upper and lower limits for the log-normal curve. For Pearson's type III curves, C_s should be treated not as independent but as dependent variables of C_v. 9. The proper way to select and determine the model frequency curve is to see whether it fits well with the actual data of grouped stations (stations to be grouped by regions for rainfall data and by C_v for runoff data) and the reasonableness of the extrapolating part. 10. Suggestions on the method of determination of x and C_v: For point rainfall, iso-x map may be utilized, and the mean C_v for each hydrologicregion may be adopted in order to minimize the errors from single stations and to avoid the discrepancies in results obtained from the same region. With regard to flood frequency analysis, flood mark reconnaissance must be utilized to determine the magnitude and the recurrence interval of the unusual flood. The x and C_v values of the floods and runoffs of hydrologically similiar river basins may be compared. Besides, the reasonableness of the results of frequency calculations as well as of the statistical parameters adopted therein may be checked by comparing runoffs and point-rainfall values of the same frequency.

A preliminary study was made on the habitat and activity of E. sinensis in Lunghwa area,a suburb of Shanghai, from January to August 1959. Out of 53 houses examined, 27 (50.9%) were found to be infested with this cockroach—afact which indicated the wide distribution of the roach in the rural area. The main breedingplace, according to the present observation, is the loose soil under the kitchen stove. 24-hour observation was carried out to determine the activity of E. sinensis,and the recordwas made hourly. It...

A preliminary study was made on the habitat and activity of E. sinensis in Lunghwa area,a suburb of Shanghai, from January to August 1959. Out of 53 houses examined, 27 (50.9%) were found to be infested with this cockroach—afact which indicated the wide distribution of the roach in the rural area. The main breedingplace, according to the present observation, is the loose soil under the kitchen stove. 24-hour observation was carried out to determine the activity of E. sinensis,and the recordwas made hourly. It was found that the roach is chiefly nocturnal in habit. It appeared at 7P.M., and reached the peak of its activity between 8--11 P.M. Gradual quiescence ensued until6 A.M. at which time it disappeared almost completely from the surface of the soil. The majority of the population was found 2.5--4 cm. under the ground during day time,the deepest at. 5 cm. In the night, most of them were found on the surface of the soil or withinthe range of 1 cm. underneath, the deepest at 3.5 cm. The average crawling speed was also determined as follows: 1512.3 cm/min. 650cm/min and nymph 474.29 cm/min. Of the roaches 84.37% showed their activity within the rangeof 30 cm. on the ground near the base of the kitchen stove.