Based on characteristic parameters of the hot water two-section type lithium bromide absorbing refrigeration machine and the parameters of the central heating system in Taiyuan City proper, the thermal economic behavior of adopting cool-electricity cogeneration to 300 MW extraction condensing unit has been calculated and analysed.

It’s mainly designed with the adoption of the MCU AT89S51 together with special formaldehyde sensor. It can detect the HCHO concentration by designing the proper acquisition circuit and display the HCHO concentration in LabVIEW control panel through RS 232 serial port.

It is found that the proper conditions ares the concentration of Li-ion 0. 8 mol/L, the concentration of PVP 0. 3 mol/L and the spin-speed of 2 000 r/min. The thickness of the film is about 0. 6 μm.

LetRo andR1 be two Kempf-Ness sets arising from moment maps induced by strictly plurisubharmonic,K-invariant, proper functions.

It is shown here that there are proper subsets of ${\cal M}$ that also form a complete set of translation invariants, and these subsets are characterized.

The existence and uniqueness of optional and predictable projections of setvalued measurable processes are proved under proper circumstances.

Benson proper efficiency in the nearly cone-subconvexlike vector optimization with set-valued functions

Under the assumption of nearly cone-subconvexlikeness, a Lagrangian multiplier theorem on Benson proper efficiency is presented.

One of the ways to raise the efficiency and diminish local overheating is by the using of shields to decrease the stray losses produced in the stator core end-plates or rotor surface of an electrical machine due to the rotating magnetic fields. However, as has been indicated in the papers by several writers, positive effects of shielding are not always realized; that is to say, the stray losses may even increase if the material or thickness of the shield is not properly chosen. In this paper, theoretical analysis...

One of the ways to raise the efficiency and diminish local overheating is by the using of shields to decrease the stray losses produced in the stator core end-plates or rotor surface of an electrical machine due to the rotating magnetic fields. However, as has been indicated in the papers by several writers, positive effects of shielding are not always realized; that is to say, the stray losses may even increase if the material or thickness of the shield is not properly chosen. In this paper, theoretical analysis of the losses in multilayer media in the rotating fields is made, a formula for the calculation of the stray losses in machines with shields is derived from this theoretical analysis based on the Maxwell's equations and curves are drawn. Finally a primary field coefficient Kp, so named by the authors, is given so as to facilitate the proper designing of the shields.. Experiments on a model have been carried out and the results obtained agreed with the analytical study.

This paper presents a method of determining the actual average temperature rise of the stator winding of a high-voltage a.c. machine, by measurig-the resistance of that winding under load by means of Kelvin bridge. The method discussed herein has the following special features:1) The installation for measurement is at zero potential, so that safety is assured in operation,2) By taking appropriate measures, disturbance of the a.c. components is Kept away from the bridge circuit, so that the installation of a...

This paper presents a method of determining the actual average temperature rise of the stator winding of a high-voltage a.c. machine, by measurig-the resistance of that winding under load by means of Kelvin bridge. The method discussed herein has the following special features:1) The installation for measurement is at zero potential, so that safety is assured in operation,2) By taking appropriate measures, disturbance of the a.c. components is Kept away from the bridge circuit, so that the installation of a complicated filter in the galvanometer circuit can he omitted. While the galvanometer still operates steadily.3) A unified method for choosing measuring elements can he applied to various ratings of machines.4) High accuracy of measurement is assured. The maximum error of resistance measurement is within 0.3%, if proper measuring elements were chosen.In the paper the result of measurement and its error are analyzed.

This paper gives certain preliminary opinions concerning the measures of insulation coordination to be adopted in EHV networks in China.The authors recommend that the actual network configurations should be considered while determining the basic insulation levels, that the use of shunt reactors and a. definite switching sequence are the principal means for limiting service frequency overvoltages, that the application of proper circuit breakers are effective and economical means to limit switching surges,...

This paper gives certain preliminary opinions concerning the measures of insulation coordination to be adopted in EHV networks in China.The authors recommend that the actual network configurations should be considered while determining the basic insulation levels, that the use of shunt reactors and a. definite switching sequence are the principal means for limiting service frequency overvoltages, that the application of proper circuit breakers are effective and economical means to limit switching surges, and that the equipment and apparatus insulation levels are finally determined in accordance with the protecting levels provided by lightning arresters. It is emphasized that the effective limitation of overvoltages should be achieved by a proper combination of various means, which supplement one another.With reference to the present insulator design and operating experiences in China, the authors remind that the insulation level determination, the controlling effect of the specific creepage distance and the external insulation of the station equipment should fulfill the same requirement.In this paper, testing voltages for station equipment, air gaps, line and substation insulators in 330 KV networks are recommended. Finally, the various problems concerning EHV network insulation coordination are pointed out, which need a further investigation.