摘要:
An LED drive device whose power dissipation can be effectively reduced without halting current supply to an LED row as well as an LED illuminating device with the LED drive device incorporated therein. When an LED 21A making up an LED row 3A has developed a short-circuit fault, a voltage corresponding to a forward voltage which has been applied to the faulty LED 21A is impressed additionally to an FET 31A for electric power consumption thereof to increase to not less than a certain value. At this time, a power limiting circuit 6A varies a potential, being a reference value of a constant current circuit 7A, at a connecting point between voltage dividing resistors 46A, 47A and then continues to supply a certain level of a current IF1 to the LED row 3A so as to keep the remaining fault-free LEDs 22A to 26A lighting. Consequently, in the event of a short-circuit fault of the LED 21A, the adverse effect caused by discontinuing the current supply to the LED row 3A can be swept away.
摘要:
A method for a gas phase catalytic oxidation reaction of a hydrocarbon, which comprises: subjecting an alkane having a carbon number ranging from 3 to 8 and/or an alkene having a carbon number ranging from 2 to 8 to a gas phase catalytic oxidation reaction to produce a vapor phase oxidation product in the presence of a mixed metal oxide catalyst, wherein the reacion is conducted in the presence of particles substantially inert to the reaction in an amount within a range of the same amount as the amount of catalyst to 99 wt. % in all particles.
摘要:
A method for producing a nitrile by a gas phase catalytic oxidation reaction of an alkane with ammonia in the presence of a catalyst, which comprises supplying the alkane and ammonia to an upper stream inlet of the catalyst layer, and separately supplying at least a part of the total amount of ammonia to a downstream position of the catalyst layer located downstream from the upper stream inlet of the catalyst layer.
摘要:
A light emitting element drive device includes a light emitting unit that includes a light emitting element and that performs dimming based on a pulse width modulation (PWM) signal, a first switching element that is turned ON or OFF based on the PWM signal and that is connected in series to the light emitting unit, and a protection circuit that includes a charging circuit and a second switching element. The second switching element is turned ON when a first voltage obtained by a charging operation of the charging circuit is equal to or more than a first predetermined value. The charging circuit discharges electric charge through the first switching element when a second voltage between input and output terminals of the first switching element drops. The first switching element is turned OFF despite the existence of the PWM signal when the second switching element is turned ON.
摘要:
The object is to provide an exhaust gas reduction catalyst that exhibit high nitrogen oxide reduction performance, and to provide a simple and efficient method for producing the catalyst, in which the amount of the waste liquid is reduced, further, an object of the invention is to provide a zeolite-containing catalyst for reducing nitrogen oxides, which does not use an expensive noble metal or the like and which has high nitrogen oxide reduction performance. The present invention relates to a catalyst for reducing nitrogen oxides, which comprises: zeolite at least containing an aluminium atom and a phosphorus atom in the framework thereof; and a metal supported on the zeolite, wherein a coefficient of variation of intensity of the metal is at least 20%, when performing an elemental mapping of the metal in the catalyst with an electron probe microanalyzer, and, a catalyst for reducing nitrogen oxides, which comprises the zeolite containing at least a silicon atom, a phosphorus atom and an aluminium atom, and having an adsorption retention rate of at least 80% in a water vapor cyclic adsorption/desorption test at 90° C.
摘要:
A load drive device capable of expanding a range of an output power by improving a linearity thereof when the output power varies. This device includes an output circuit (14) for supplying an electric power to an LED (10), a feedback circuit (28) for turning on or off the electric power supplied to the LED (10) according to a duty ratio of a burst signal to control the electric power and generating a control value for controlling the LED (10) based on an A/D-converted value obtained by detecting an output current (Iout) to the LED (10) to send out the control value to the output circuit when the supply of the electric power is in an on-state, a burst signal previous value correcting circuit (64) for correcting a presently generated control value (y) based on the A/D-converted value (V) and the previous control value (x) which are generated every cycle of the burst signal, and a duty ratio determination circuit (66) for allowing the burst signal previous value correcting circuit (64) to operate upon determining that the duty ratio of the burst signal goes above or below a reference value.
摘要:
[Object] To provide a catalyst for nitrogen oxide removal having no degradation problem caused by adsorbed water when a temperature is raised sharply and exhibiting excellent nitrogen oxide removal performance and retentive characteristic thereof.[Solution] A catalyst for nitrogen oxide removal, containing a metal-loading zeolite, wherein the zeolite contains a silicon atom, an aluminum atom, and a phosphorus atom in a framework structure, and the amount of water adsorption of the catalyst at 25° C. and a relative vapor pressure of 0.5 is 0.05 to 0.2 (kg-water/kg-catalyst) or less. A method for manufacturing this catalyst for nitrogen oxide removal, the method including the steps of drying a mixed slurry containing a metal source, the zeolite, and metal oxide particles having an average particle diameter of 0.1 to 10 μm and/or an inorganic binder and calcining the resulting dry powder.
摘要:
A process for producing a nitrile, which comprises subjecting an alkane and ammonia in the gaseous state to catalytic oxidation in the presence of an oxide of the formula:Mo.sub.a V.sub.b Te.sub.c Nb.sub.d X.sub.x O.sub.n ( 1)wherein X is at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Tl, In, Ti, Zr, Hf, Ta, Cr, Mn, W, Fe, Ru, Co, Rh, Ni, Pd, Pt, Zn, Sn, Pb, As, Sb, Bi, La and Ce,when a=1,b=0.01 to 1.0,c=0.01 to 1.0,d=0 to 1.0, andx=0.0005 to 1.0,and n is a number such that the total valency of the metal elements is satisfied.
摘要:
A catalystic composition suitable for producing acrylonitrile from propylene, ammonia and oxygen (or oxygen-containing gas), which composition is represented by the following formula:(Mo).sub.a (W).sub.b (Bi).sub.c (Pb).sub.d (B).sub.e (Sb).sub.f (X).sub.g (O).sub.h(where: X is chromium or iron; a, b, c, d, e, f, g and h denote respectively number of atoms for molybdenum, tungsten, bismuth, lead, boron, antimony, X and oxygen, and wherein, if it is given that a+b=12, 0.ltoreq.b.ltoreq.7, 0.4.ltoreq.c.ltoreq.7, 2.ltoreq.d.ltoreq.12, 0.2/22.ltoreq.e/a.ltoreq.40/22, 0.ltoreq.f/a.ltoreq.25/22, and 0.ltoreq.g/a.ltoreq.3/22; and h denotes the number of oxygen necessary for satisfying the atomic valence for the individual constituent elements other than oxygen).
摘要翻译:适用于由丙烯,氨和氧(或含氧气体)生产丙烯腈的催化剂组合物,该组成由下式表示:(Mo)a(W)b(Bi)c(Pb)d(B)e (Sb)f(X)g(O)h(其中:X是铬或铁; a,b,c,d,e,f,g和h分别表示钼,钨,铋,铅的原子数, 硼,锑,X和氧,并且其中,如果给定a + b = 12,0,b = 7,0.4,c = 7,2, 12,0.2 / 22 = e / a = 40/22,0 / f / a = 25/22,0 g / a = 3/22; h表示 满足除氧以外的各个构成要素的原子价所必需的氧的数量)。
摘要:
There is disclosed a catalytic composition represented by the formula:(Mo).sub.a (W).sub.b (Bi).sub.c (Pb).sub.d (Sb).sub.e (A).sub.f (B).sub.g (C).sub.h (P).sub.m (O).sub.nin which A is iron and/or chromium, B is cerium and/or magnesium and C is potassium and/or lithium; and a, b, c, d, e, f, g, h, m and n stand for the numbers of atoms for molybdenum, tungsten, bismuth, lead, antimony, A, B, C, phosphorus and oxygen elements respectively, wherein, given that a+b=12,0.ltoreq.b.ltoreq.7, 0.4.ltoreq.c.ltoreq.7, 2.ltoreq.d.ltoreq.12,0.1/22.ltoreq.e/a.ltoreq.25/22, 0.05/22.ltoreq.f/a.ltoreq.3/22,0.ltoreq.g/a.ltoreq.2/22, 0.ltoreq.h/a.ltoreq.3/22,0.ltoreq.m/a.ltoreq.7/22, andn is the numbers of oxygen necessary to satisfy the valences of atoms for the individual constituent elements other than oxygen.
摘要翻译:公开了由式(Mo)a(W)b(Bi)c(Pb)d(Sb)e(A)f(B)g(C)h(P)m(O)表示的催化剂组合物, n,其中A是铁和/或铬,B是铈和/或镁,C是钾和/或锂; 和a,b,c,d,e,f,g,h,m和n分别代表钼,钨,铋,铅,锑,A,B,C,磷和氧元素的原子数,其中 ,给定a + b = 12,0,b = 7,0.4,c = 7,0,...,12 / = 25 / 22,0.05 / 22 f / a = 3/22,0 g / a = 2/22,0 h / a = 3/22,0 = m / a = 7/22,n是满足氧以外的各个构成元素的原子价数所需的氧数。