Abstract: A method for treating waste printed circuit boards, the method has the steps of:

Abstract: A working fluid which demonstrates a preferable performance even with a small filling amount of the refrigerant of hydrocarbons containing no halogen atom such as ethane, propane, butane, iso-butane and the like into the refrigerating cycle equipment is disclosed. There is also disclosed a refrigerating cycle equipment excellent in the safety against the worst case of the refrigerant leakage, brought by the use of the above-mentioned working fluid. The working fluid comprises the refrigerant of hydrocarbons containing 2 to 4 carbon atoms and no halogen atom, and a lubricating oil for a refrigerator containing, as its main component, an ester compound which is incompatible with the above-mentioned refrigerant.

Abstract: There is disclosed a working fluid for refrigerating cycle equipment of refrigerant compression-type containing the refrigerant and a refrigeration lubricant for a refrigerator, wherein said refrigerant comprises a hydrocarbon having 2 to 4 carbon atoms and no halogen atom and said refrigeration lubricant comprises, as a main component, a ketone compound which is incompatible with said refrigerant. This working fluid demonstrates preferable performance even if the amount of the refrigerant is small.

Abstract: A refrigeration system includes an outdoor unit having a refrigeration compressor and a heat exchanger, and an indoor unit having a heat exchanger to be placed where air conditioning is desired. In installing the refrigeration system, the outdoor unit is first connected with the indoor unit via pipe lines, and an air absorbing device containing zeolite as an adsorbent is subsequently placed on the outdoor unit, the indoor unit, or the pipe lines to remove air. The air absorbing device is then separated from the refrigeration system, and refrigerant is caused to circulate through the refrigeration system.

Abstract: A method for constructing a refrigerating cycle that has a unit having a refrigerating compressor which is filled with a part or all of a quantity of working medium beforehand and a heat exchanger, and a unit having a heat exchanger that is located in an area of air conditioning and refrigeration, wherein the units are connected with each other by piping, uses such steps of: connecting the unit having the refrigerating compressor and heat exchanger with the unit having the heat exchanger that is located in an area of air conditioning and refrigeration by means of piping; removing oxygen in a system of the refrigerating cycle by providing an oxygen absorbent in a course of a refrigerant circulating path; separating the oxygen absorbent from the refrigerating cycle; and circulating a refrigerant in the refrigerating cycle, wherein the separating step is carried out immediately after or after the removing step, and the refrigerant circulating step is a final step.

Abstract: A refrigeration system includes an outdoor unit having a refrigeration compressor and a heat exchanger, and an indoor unit having a heat exchanger to be placed where air conditioning is desired. In installing the refrigeration system, the outdoor unit is first connected with the indoor unit via pipe lines, and an air absorbing device containing zeolite as an adsorbent is subsequently placed on the outdoor unit, the indoor unit, or the pipe lines to remove air. The air absorbing device is then separated from the refrigeration system, and refrigerant is caused to circulate through the refrigeration system.

Abstract: Highly electrically conductive and stable macrocyclic poly-conjugated systems are provided from a preferred polymer comprising a repetition of cyclic structures each represented by Formula (1): ##STR1## X and Y each are at least one group selected from the group consisting of a C--C unsaturated bonding group, a C--N unsaturated bonding group, an N--N unsaturated bonding group, an Si--Si bonding group and at least one group selected from the group consisting of an aromatic ring, a heterocyclic ring and their derivatives. .alpha., .beta., .gamma., and .delta., when they do not form a closed ring with X, are each at least one group selected from the group consisting of a hydrogen atom, a C.sub.1-5 lower alkyl group, an --NH.sub.2 group, and an --NR.sub.2 group in which R is a C.sub.1-5 lower alkyl group. When .alpha., .beta., .gamma., and .delta. form a closed ring with X, (.alpha. and .beta.) or (.gamma. and .delta.) together jointly represent ##STR2## in which R is a C.sub.1-5 lower alkyl group.

Abstract: A liquid crystal orientation film comprises a support film formed on a substrate, and an orientation-control film formed on and chemically coupled with the support film. The orientation-control film has a trifluoromethyl group and is in direct contact with a liquid crystal in a liquid crystal display device.

Abstract: 37 A liquid crystal display device is provided which comprises a cell unit having a pair of optically transparent substrates each having an optically transparent electrode layer and an alignent layer for liquid crystal formed in this order on one side of the substrate. The paired substrates is in spaced relation with each other and is arranged such that the respective alignment layers are facing each other. A liquid crystal is contained in the space between the paired substrates. The alignment layers are made of a polymer material having both a ring structure and a substituted group at side chains thereof and are subjected to rubbing treatment. The use of the alignment layers ensures a great pretilt angle for liquid crystal molecules.