Abstract: A head-mounted display device includes an image display unit (300a, 300b) configured to emit image light, a light guide member (100a, 100b) configured to guide the image light and emit the image light to eyes of a wearer who wears the head-mounted display device, and a relay optical system (201a, 201b) arranged between the image display unit and the light guide member, and configured to relay the image light from the image display unit to the light guide member, and form an intermediate image at least once before the image light enters the light guide member.

Abstract: A switch has a determining section and a memory managing section. The determining section determines whether or not the node is in a non-ordinary state in which received packets cannot be successfully processed, on a basis of a determination whether or not congestion notification packets received from a node have been continuously received during at least a given period and a determination whether or not a quantity of memory used in a buffer memory which accumulates received packets is at least a given value. The memory managing section deletes, in a case where the node is determined to be in the non-ordinary state, data addressed to the node in the non-ordinary state among data accumulated in the buffer memory.

Abstract: A switch has a determining section and a memory managing section. The determining section determines whether or not the node is in a non-ordinary state in which received packets cannot be successfully processed, on a basis of a determination whether or not congestion notification packets received from a node have been continuously received during at least a given period and a determination whether or not a quantity of memory used in a buffer memory which accumulates received packets is at least a given value. The memory managing section deletes, in a case where the node is determined to be in the non-ordinary state, data addressed to the node in the non-ordinary state among data accumulated in the buffer memory.

Abstract: A method of improving the stability of a quaternary ammonium salt and a method of efficiently preparing the quaternary ammonium salt having improved stability.

Abstract: A method of improving the stability of a quaternary ammonium salt and a method of efficiently preparing the quaternary ammonium salt having improved stability.

Abstract: A high yield process for preparing 4,6-dialkoxy-1,3,5-triazine-2-halide by reacting a cyanuric halide with an alcohol compound such as methanol in the presence of an alkali such as sodium hydrogencarbonate, wherein the water content present in the reaction system at the beginning of the reaction is controlled to not more than 0.5 mol based on 1 mol of the cyanuric halide or the water content present in the reaction system during the period of the reaction is controlled to not more than 2.5 mol based on 1 mol of the cyanuric halide.

Abstract: A method of improving the stability of a quaternary ammonium salt and a method of efficiently preparing the quaternary ammonium salt having improved stability.

Abstract: The decomposition of di-t-butyl dicarbonate which is a thermally unstable compound is inhibited. To achieve the object, a hydrocarbon compound such as hexane, cyclohexane, 1-hexene or toluene and/or a chain ether compound such as diisopropyl ether or t-butyl methyl ether are/is used as a decomposition inhibitor for di-t-butyl dicarbonate.

Abstract: A method of preparing carboxylic acid derivatives comprising mixing a quaternary ammonium salt having a particular triazine ring in the molecules thereof, a carboxylic acid compound and a compound having a nucleophilic functional group, to condense the carboxylic acid with the compound having the nucleophilic functional group. The invention further provides a condensing agent comprising the quaternary ammonium salt. The condensation is conducted under mild conditions to form carboxylic acid derivatives and, particularly, amide compounds or ester compounds maintaining high yields.

Abstract: In the process of the invention to prepare 4,6-dialkoxy-1,3,5-triazine-2-halide by reacting a cyanuric halide with an alcohol compound such as methanol in the presence of an alkali such as sodium hydrogencarbonate, the water content present in the reaction system at the beginning of the reaction is controlled to not more than 0.5 mol based on 1 mol of the cyanuric halide or the water content present in the reaction system during the period of the reaction is controlled to not more than 2.5 mol based on 1 mol of the cyanuric halide. According to the invention, 4,6-dialkoxy-1,3,5-triazine-2-halide can be prepared in a high yield.

Abstract: A process for producing di-tert-butyl dicarbonate by continuously carrying out the following steps of reacting tert-butyl alcohol with sodium to form sodium tert-butoxide, reacting the sodium tert-butoxide with carbon dioxide to form mono-tert-butyl sodium carbonate, and reacting the mono-tert-butyl sodium carbonate with an aromatic sulfonyl halide such as p-toluenesulfonyl chloride in the presence of a tertiary amine such as N,N,N',N'-tetramethylethylenediamine, without isolating an intermediate in the middle of each reaction stage. This process is an industrially advantageous process for producing di-tert-butyl dicarbonate from tert-butyl alcohol and an alkali metal.

Abstract: A chemical vapor deposition (CVD) reactor for forming a film at the surface of a base material, and a production method for an oxide superconductive conductor using this CVD reactor, are disclosed. The CVD reactor is provided with a processing chamber, a material gas supply mechanism which supplies material gas into the processing chamber, and a gas exhaust mechanism which vents gas from inside the processing chamber. The processing chamber is divided by partitions into a base material introduction section, a reaction chamber, and a base material guide-out section. A base material transit opening is formed in each partition, and a base material conveyance region is formed inside the reaction chamber passing through the base material introduction section, the reaction chamber and the base material guide-out section. The material gas supply mechanism is provided with a material gas supply source and a gas disperser and is connected to the material gas supply source.