In this paper,it is Proved that for an arbitrary given real matrix A= (α_(ij)) of order 6,where |α_(ij)≤1,P_n is less than 6.7883 and an improved method of estimating P_n is given for an arbitrary general real matrix of order n.
本文证明了对任意一个给定的6阶实阵 A=(a_(ij)),若其中|a_(ij)|≤1,则有 P_6<6.7883.对于一般 n 阶矩阵,本文给出了估计 P_n 的一个改进方法.
Two improved method are described for the preparation of crystalline tetrachlorodie- thylenediplatinum [Pt (C2 H4) Cl2 ]2. In the courte of our experimetal work.
Results Normal rCBFs calculated with our improved method and with the conventional one were (70.01±7.64) ml·min~ -1 ·100 g~ -1 , (34.85±1.82) ml·min~ -1 ·100 g~ -1 , respectively in the gray matter. Normal rCBFs in the gray matter had significant difference between two methods (t=12.64, P<0.01).
Normal rCBFs calculated with our improved method and with the conventional method were (24.85±3.72) ml·min~ -1 ·100 g~ -1 , (12.88±1.75) ml·min~ -1 ·100 g~ -1 , respectively in the white matter. The normal rCBFs in the white matter showed significant difference between two methods (t=8.23, P<0.01).
Methods:Amniotic fluid,which was extracted from pregnant women during 16～30th weeks gestation(n=138) was inoculated and cultured by all nutrition culture medium (4ml) and amniotic fluid cells mixed liquid (5ml),then they were gathered to set up chromosome according to improved method in proper time.
Results The Kd values measured with this improved method under two different conditions were 2.61×10-12 mol/L and 2.39×10-12 mol/L, and those with Friguent method in these two conditions were 5.57×10-10 mol/L and 1.41×10-10 mol/L, respectively.
The experiments showed that the quality of DNA extracted by this improved method was much higher,DNA stripes were very clear without tagging,the concentration was 1.5397-2.1039μg/L and OD_(260)/OD_(280) was 1.6913-(1.8025).
RESULTS The adopted improved method was preferable, the recovery is increasing respectively 12%～13.76% and 7.00%～7.39% then other common method, and the recovery was validated up to 98.48% by internal standard method.
We used an improved method of increasing ICP to establish a stable BD model.
An improved method of photometric determination of cyclodextrin glucanotransferase activity
An improved method for assaying of the total endodepolymerase activity of pectinases has been developed.
On the basis of [1] an improved method was developed which, within the framework of the model of an ideal gas, allows one to calculate the flow in ejector nozzles without a limit on the coefficient of ejection.
The use of an improved method of numerical solution [3] has made it possible to advance into the region of large temperature differences.
The current methods for the preparation of ethyl orthosilicate do not give satisfactory results.It is found that the low yield is due to the use of excess alcohol,which,in presence of hydrogen chloride,produces water and causes the ethyl orthosilicate to undergo a hydrolytic polycondensation.The condensation products have been isolated and identified as 1,3-hexaethoxydisiloxane and 1,3,5- octaethoxytrisiloxane. An improved method,consisting of the addition of equivalent quantities of silicon tetrachloride...
The current methods for the preparation of ethyl orthosilicate do not give satisfactory results.It is found that the low yield is due to the use of excess alcohol,which,in presence of hydrogen chloride,produces water and causes the ethyl orthosilicate to undergo a hydrolytic polycondensation.The condensation products have been isolated and identified as 1,3-hexaethoxydisiloxane and 1,3,5- octaethoxytrisiloxane. An improved method,consisting of the addition of equivalent quantities of silicon tetrachloride and anhydrous ethyl alcohol into ice-cold ethyl orthosilicate as diluent,is recommended.The reaction mixture gives 95% of theoretical yield of the ethyl orthosilicate.
In the improved method, after the phosphorylation reaction had approached equilibrium, a few ml, of phosphoric acid and 2 volumes of 95％ ethyl alcohol was then added, (final pH approches 4.0). At this pH, inorg, phosphate is chiefly in the form KH_2PO_4, which is insoluble in alcohol and precipitated together with starch and proteins. (the p＇p＇t may be used again for the preparation of G-1-P) and the filtrate was then made alkaline to phenol red. A p＇p＇t of pot. salt of G-1-P was formed together with some...
In the improved method, after the phosphorylation reaction had approached equilibrium, a few ml, of phosphoric acid and 2 volumes of 95％ ethyl alcohol was then added, (final pH approches 4.0). At this pH, inorg, phosphate is chiefly in the form KH_2PO_4, which is insoluble in alcohol and precipitated together with starch and proteins. (the p＇p＇t may be used again for the preparation of G-1-P) and the filtrate was then made alkaline to phenol red. A p＇p＇t of pot. salt of G-1-P was formed together with some inorg, phosphate, which could be removed by satd. magnesia mixt. The product of G-1-P was recrystallized, if desired.
The application of Cu-Pan system EDTA titration of some cations was reinves-tigated systematically. The influence of various factors such as pH, temperature, quantity of indicator used, was studied in some detail. The stability constants of Cu-PAN complex were found to be 1.4×10~6, at pH 2; 1.9×10~6, at pH 4; 1×10~5, at pH 6; 7.5×10~4, at pH 8; and 2.1×10~5, at pH 10. Based upon the above observations an improved method was suggested as follows: Dissolve a certain amount of salt sample in distilled water...
The application of Cu-Pan system EDTA titration of some cations was reinves-tigated systematically. The influence of various factors such as pH, temperature, quantity of indicator used, was studied in some detail. The stability constants of Cu-PAN complex were found to be 1.4×10~6, at pH 2; 1.9×10~6, at pH 4; 1×10~5, at pH 6; 7.5×10~4, at pH 8; and 2.1×10~5, at pH 10. Based upon the above observations an improved method was suggested as follows: Dissolve a certain amount of salt sample in distilled water or dilute hydrochloric acid to make a solution of about 0.02 M. in concentration. Pipette 10 ml. of this solution accurately into a beaker. Add 5 ml. of acetate buffer or other suitable buffer as required for the specified sample. About 20% excess of standard disodium EDTA solution is added and then 10—15 ml. of alcohol. Titrate with 0.02 M. standard Cu~(++) solution until the color of the solution changes from yellow to orange red, using 5—10 drops of 0.1% of methanolic solution of PAN as indicator. The method gave a more distinct end point in determination of Ba~(++) and Cr~(+++) in comparison with the method using Eriochrome black T as indicator.
improved method
改进方法
查询“improved method”译词为其他词的双语例句
查询“improved method”译词为用户自定义的双语例句
相关查询
2008 CNKI－中国知网