.


:




:

































 

 

 

 


-




, .. , , , , , , - , .

, , , .

, .

- oxygen, ionosphere, .

, , :

switch

.

:

: Most of the modern radio-transmitters can communicate both telegraph and telephone signals.

, , :

1: , .

:

2: , .

, , .

, , .

- , :

) , - , :

: You might ask why engineers have generally chosen to supply us with a.c. rather than d.c. for our household needs.

: , , .

: We know the primary coil in the ordinary transformer to have more turns than the secondary one.

: , , .

) .

, , , :

: The zinc in the dry cell accumulates a great many excess electrons which will move to the carbon electrode.

: , .

: Fig. 10 gives a drawing of a bulb; the filament will be seen in the centre.

: . 10 ; .

) , . , , , .

) , , :

1. d.c. (direct current) - ;

2. .. (alternating current) - ;

3. s.a. (sectional area) - ;

4. b.p. (boiling point) - .

.

) . , .. , , :

: We have learned to manufacture dozens of construction materials to substitute iron.

dozen () , :

: , .

, - , , , , , .

. . , , :

1. - . , , , , .

2. - . , , . : , , ( ), ;

3. . " ".

4. - , . "" .

. .

1. : One proposal for the mechanism of initiation of detonation involves grain burning started by means of the compressional heating of interstitial gases in the pressing.

: .

started by means, , .

Interstitial - .

2. : Regardless of these details, the temperature can be altered at least 500 by choosing gases with widely different hydrodynamic and thermodynamic properties.

: , , , 500Ѱ, .

details - , , . by choosing - , , , .

3. : The results of these tests are shown in Fig. 6; the fact that these depths of initiation agree within experimental error with the values for air is taken as strong indication that the temperature of the inter-stital gas has nothing to do with the mechanism of initiation.

: . 6. , , .

, 2 , . , , .

inter-stital, , , .

4. : Temperature differences of several hundred degrees would have a profound effect on the rate of grain burning or on the rate of chemical reaction if such temperature changes could be brought to bear on these processes.

: , .

, , , , temperature differences, , .

5. : This low-pressure shot is also shown in Fig. 6, and again demonstrates that the interstitial gases did not affect the initiation process.

: .6, .

low-pressure shot , .

6. : For this discussion, static compression stress or static shear stress can be considered the stress which is exerted on the elastomer by normal rated torque delivery.

: , , .

for this discussion - - .

7. : Important, too, in obtaining maximum service life, is prevention of a return to zero strain once the initial strain due to normal operation is applied.

: , , .

, .. , , , .

8. : Selection of a specific elastomer to perform the specific duties must include consideration of many factors.

: , .

, - , - . .

9. : One of the major problems encountered in the operation of high-enthalpy test facilities is the determination of high stagnation temperatures (T = 4,000 R).

: , ( = 4000 ).

, .

10. : In the present analysis, this method was applied to determine stagnation temperature for stagnation pressures ranging from 100 to 1,000 atm.

: , 100 1000 .

in the present - - , . , . one-dimensional . , - , , , , - . 7. - -2014 - 2014 . , , , . -2014. () 300 . 2014 . , , , . . 2014 , , 200 . . -2014 , , , . -2014, 12 , . . .. 2014 , , . , - , . The "Sochi 2014" plan takes into account all the needs and demands athletes may have, preparing for the best Winter Games in Olympic history The city of Sochi is a candidate to host the 2014 Olympics. The Winter Games could be unique if they are staged in Sochi, since only here does seacoast scenery blend together with snow-covered mountains to create ideal conditions for winter sports. The Russian Government is actively supporting the Sochi-2014 bid. It has adopted a Special Federal Programme (SFP) with a budget of more than 300 billion rubles. As a result of the SFP, by the year 2014, Sochi will turn into an all-year resort of world standing, with a modern infrastructure and a developed hotel network. Over the next seven years, with the federal programme's help, Sochi will see the construction of new roads, hotels, modern engineering communications, as well as modern resort and sports structures. All of this will give the city an opportunity to host visitors from around the world. Hosting the 2014 Winter Games also will allow the city to create an international centre for winter sports, where athletes from Russia and neighbouring countries - nations with a combined population of 200 million people - could train. Sochi-2014 offers a compact and effective plan for situating Olympic sites, creating the most comfortable conditions possible for athletes, the Olympic family, spectators, and Games participants. According to the Sochi-2014 plan, 12 new sports facilities, grouped into two complexes, will be built: the seacoast complex for ice competitions and the mountain complex in Krasnaya Polyana. They are conveniently located just an hour's drive from each other. Should Sochi win the right to stage the 2014 Games, the city will turn into the new winter capital of Russia, renowned for its achievements in winter sports. Sochi has all that is required to offer the world unique and unforgettable Winter Games - it has the resources, know-how and desire. Optimized structure development In the previous stage, we created a query list for search refinement. We will use it now to create site structures. By analyzing the text and HTML markup of the site's pages, search engines determine the page's most important words: the most repeated ones, those selected as headers or highlighted in bold, or available in links to the given page. It is somewhat difficult to optimize the page for many different queries since all of the words may not be simultaneously the most repeated ones, and also appear in headers and incoming links. The most realistic way to do this is: - to mark out one or two basic query phrases from the prepared list for each site page; - to write a text using these phrases; - to optimize the page's HTML markup to emphasize these phrases; - to add rare phrases to the text consisting of words from the main phrases; - to add queries associated with the basic phrases to the text; - to insert internal and external links with the main phrases on that page. Therefore, thinking the site structure through, one must determine how many and which pages will be allocated for the approved queries. Ideally, it should possible to create a page (and preferably several pages) for each essential query. The creation of heading and site page structures in the Web-SSS is a fairly simple process, similar to the creation of folder and file structures in Windows. HTML , : , , . , , . : - - ; - ; - HTML- ; - ; - ; - . , , . ( - ) . Web-SSS - , Windows.
 
Most of the modern radio-transmitters can communicate both telegraph and telephone signals , , can communicate - . , , . - 50% - 50%
You might ask why engineers have generally chosen to supply us with a.c. rather than d.c. for our household needs , , , a.c. d.c. . - 100%
We know the primary coil in the ordinary transformer to have more turns than the secondary one , , , we know - - . 100%
The zinc in the dry cell accumulates a great many excess electrons which will move to the carbon electrode , . -
Fig. 10 gives a drawing of a bulb; the filament will be seen in the centre . 10 ; . , , - - 100%
We have learned to manufacture dozens of construction materials to substitute iron. , . , dozens - . - 100%
The installation includes four closed circuit grinding lines regulated by individual control systems, plus separate Belt-Meter units that measure and record total tonnages of plan output - iron concentrates and pyrites. , , , . Belt-Meter, , . plan , 50% 50%
One proposal for the mechanism of initiation of detonation involves grain burning started by means of the compressional heating of interstitial gases in the pressing started by means - , . Interstitial - - 50% 50%
Regardless of these details, the temperature can be altered at least 500 by choosing gases with widely different hydrodynamic and thermodynamic properties. , , , 500Ѱ, . details - , , . by choosing - , . - 50% - 50%
The results of these tests are shown in Fig. 6; the fact that these depths of initiation agree within experimental error with the values for air is taken as strong indication that the temperature of the inter-stital gas has nothing to do with the mechanism of initiation . 6. , , inter-stital, , . - 100%
Temperature differences of several hundred degrees would have a profound effect on the rate of grain burning or on the rate of chemical reaction if such temperature changes could be brought to bear on these processes , , temperature differences , - 100%
This low-pressure shot is also shown in Fig. 6, and again demonstrates that the interstitial gases did not affect the initiation process .6, low-pressure shot , - 100%
For this discussion, static compression stress or static shear stress can be considered the stress which is exerted on the elastomer by normal rated torque delivery , , for this discussion - - - 100%
Static stress, if held to practical limits, is not the major criterion for determining service life of the elastomer , , if held to practical limits - , - 100%
Important, too, in obtaining maximum service life, is prevention of a return to zero strain once the initial strain due to normal operation is applied , , . -
Selection of a specific elastomer to perform the specific duties must include consideration of many factors , . - 100%
There is no one material which will satisfy all requirements in all applications , There is no one material - , in all applications - , - 50% - 50%
One of the major problems encountered in the operation of high-enthalpy test facilities is the determination of high stagnation temperatures (T = 4,000 R) , ( = 4000 ) . -
Since these temperatures normally exceed the capabilities of available thermocouples, it is often necessary to resort to one of the various optical methods - such as pyrometry or the sodium-line reversal technique - for the determination of these temperatures , , , , - , for the determination of these temperatures , . - 100%
In the present analysis, this method was applied to determine stagnation temperature for stagnation pressures ranging from 100 to 1,000 atm. , 100 1000 . in the present - - . - 50%
A one-dimensional analysis of the flow is used to evaluate the mass flow per unit area at the throat of a nozzle for various stagnation pressures and temperatures one-dimensional . - 50%
Starting with an assumed stagnation pressure and temperature, an initial value of stagnation entropy was obtained from published data , - published - , - . - 50%
The spread between the ideal-gas and real-gas curves becomes larger as the stagnation pressure is increased , spread - . curves, , , - 50% - 50%

 


 

3





:


: 2018-10-18; !; : 754 |


:

:

, .
==> ...

1507 - | 1413 -


© 2015-2024 lektsii.org - -

: 0.038 .