摘要:
A process for producing a lower aliphatic carboxylic acid alkenyl, comprising reacting a lower olefin, a lower aliphatic carboxylic acid and oxygen in a gas phase in the presence of a catalyst comprising a support having supported thereon a catalyst component containing a compound containing alkali metal and/or alkaline earth metal, an element belonging to Group 11 of the Periodic Table or a compound containing at least one of these elements, and palladium, wherein the conversion of the lower aliphatic carboxylic acid is 80% or less or the concentration of the lower aliphatic carboxylic acid at the reactor outlet is 0.5 mol % or more.
摘要:
Disclosed is an automobile door structure supported on an automobile body and adapted to be engaged with and disengaged from said automobile body through a door latch, which comprises an outer segment 2, and an inner segment 6, 8 disposed on the side of an automobile cabin relative to the outer segment 2 and provided with the door latch. The inner segment includes enhancement means 50 for enhancing an acoustic conversion efficiency of a vibration having a specific low frequency among vibrations of the door latch generated during door closing. The automobile door structure of the present invention can enhance a low-frequency sound capable of giving the impression of dignity on an occupant.
摘要:
A process for producing allylic ether compounds in presence of a catalyst comprising at least one Cu(II) salt by reaction of an allylic alcohol with either itself or another alcohol.
摘要:
A method and system to provide a command queue re-ordering method that can make the power save and reduction in acoustic noise. The command queue re-ordering method involves calculating the value of an evaluation function, Ev=A×T+(1−A)×Fun(L) (A is any number from 0 to 1, T is a latency required to execute a write command and/or read command, and Fun(L) is an evaluation function with a seek distance L) for the write command and/or read command, and selecting the write command and/or read command having the minimum value as a next command to be execute.
摘要:
A process for producing a hydrogenated ester by hydrogenating an unsaturated group-containing ester having a specific structure by using a hydrogenating catalyst so as to obtain a hydrogenated ester with a high selectivity. It is preferred that the unsaturated group-containing ester as the raw material is diluted with an inert solvent and/or the concentration of carboxylic acid contained in the raw material is made 1 wt. % or less so as to effect a hydrogenation reaction. The hydrogenating catalyst to be used for the above hydrogenation may preferably be one comprising at least one metal selected from Group 8 elements, Group 9 elements, and Group 10 elements in the periodic table according to Nomenclature of Inorganic Chemistry, Revised Edition, 1989, International Union of Pure and Applied Chemistry, and preferably has an acidity of 1.0×10−1 mmol/g or less.
摘要翻译:通过使用氢化催化剂氢化具有特定结构的不饱和基团的酯以通过高选择性获得氢化酯来生产氢化酯的方法。 作为原料的含不饱和基团的酯优选用惰性溶剂稀释和/或原料中所含的羧酸浓度为1重量%。 %以下,进行氢化反应。 用于上述氢化的氢化催化剂可优选为包含选自元素周期表第8族元素,第9族元素和第10族元素中的至少一种金属的化合物,根据无机化学术语,1989年修订版,国际 Union and Pure Chemistry,并且优选具有1.0×10 -1 mmol / g以下的酸度。
摘要:
A method for manufacturing solid structural material using a three-dimensional five-axial woven fabric. In weaving a three-dimensional five-axial woven fabric W using a three-dimensional weaving machine, divisibly woven sections are formed in portions of a manufactured three-dimensional five-axial woven fabric by alternately driving an upper and a lower insertion members for inserting a vertical yarn from above and below, respectively, in such a manner that each of the insertion members and a weft insertion rapier are driven with different timings.
摘要:
A first detector group 1 and a second detector group 2, disposed opposite to each other and detecting gamma ray pairs resulting from electron-positron pair annihilation, are each constituted by two two-dimensional radiation detectors 101, and 102, 201, and 202, and arranged so that a prescribed arrangement spacing L2 is established between the scintillator arrays 11 and 21. Furthermore, the coincidence counting circuit 50 of the signal processing circuit 5 is constituted so as to carry out coincidence counting for diagonally disposed detectors as well as oppositely disposed detectors. Accordingly, the are a between the ranges of the fields of view resulting from opposite detectors is supplemented by a range of the field of view resulting from diagonally disposed detectors. Consequently, it becomes possible to attain a positron imaging device wherein the range of the field of view is efficiently expanded, and the simplification and cost reduction of the device are realized.
摘要:
A catalyst for use in producing acetic acid, comprising as essential components (a) palladium and (b) at least one compound selected from heteropolyacids and/or salts thereof, wherein (c) a vanadium element and/or molybdenum element is contained in a specific proportion. Acetic acid is produced from ethylene and oxygen by a gas phase single-stage reaction using the catalyst.
摘要:
A polyester or polyurethane polymer having a repeating unit represented by the following formula (1): ##STR1## wherein A is a polyol compound residue represented by the following formula (2) or formula (3): ##STR2## wherein R.sup.1 and R.sup.3 each individually represents an alkyl group having from 1 to 4 carbon atoms, and R.sup.2 and R.sup.4 each individually represents a hydrogen atom or a methyl group; and B is represented by the following formula (4) or formula (5): ##STR3## wherein X represents an alkylene, cycloalkylene, arylene or arylalkylene group having from 1 to 12 carbon atoms; ##STR4## wherein Y represents an alkylene, cycloalkylene, arylene or arylalkylene group having from 1 to 12 carbon atoms.
摘要:
A perpendicular magnetic recording medium wherein a perpendicular magnetic film is formed on a substrate or a nonmagnetic film, and the perpendicular magnetic film contains Co and Cr, the content of the Cr being 22 at. % or higher but 30 at. % or less. The medium is used in a magnetic recording disk drive using a magnetoresistive read head.