摘要:
There is herein disclosed a process for efficiently preparing, from an &agr;-hydroxycarboxylic amide and an alcohol in an industrially advantageous manner, an &agr;-hydroxycarboxylate which is useful as any of raw materials for solvents, food additives, perfumes, various organic medicines and the like. According to the present invention, there is provided a process for preparing an &agr;-hydroxycarboxylate which comprises the step of reacting an &agr;-hydroxycarboxylic amide and an alcohol in the presence of a catalyst in a liquid phase, while an ammonia concentration in a reaction solution is maintained at 0.1% by weight or less by discharging generated ammonia as a gas into a gaseous phase.
摘要:
There is provided a DRAM capable of carrying out rapid data readout. The DRAM includes a memory cell array 1; a row decoder 3 for selectively driving word lines; a bit line sense amplifier 2 for controlling data, which are read out to a plurality of bit lines by driving the word lines, by a first sense amplifier activating signal to detect and amplify the data; a column selecting gate 5, which is driven by a column selecting signal generated behind the first sense amplifier activating signal, for connecting the selected bit line to a corresponding data line; and a data line sense amplifier, which is connected to the data line and which is controlled by a second sense amplifier activating signal generated behind the column selecting signal, the data line sense amplifier being associated with the bit line sense amplifier for detecting and amplifying data transmitted to the data line by the data selecting gate 5.
摘要:
In a semiconductor device such as a thin film transistor a semiconductor region is formed and an insulating film is formed on the semiconductor region to have a contact hole extending to the semiconductor region. An electrically conductive metal layer is formed of aluminum to fill the contact hole. An electrically conductive protection layer is formed on the metal layer to prevent oxidation of the metal layer during manufacturing of the semiconductor device. Material of the protection layer is more difficult to be oxidized than aluminum. A transparent electrode is formed on the protection layer such that the electrode is electrically connected to the semiconductor region. The protection layer may be formed of titanium or a laminate layer of a titanium layer and a titanium nitride layer.
摘要:
A semiconductor device which achieves high-speed access and prevents the latch-up for any power inputting sequence by a plurality of power sources is disclosed. Where the chip voltage VDD is earlier inputted, an N well bias circuit 9 and a P well bias circuit 10 are activated, and an N-type well 12 and a P-type well 13 are biased respectively. After that, although the interface voltage VDDQ is inputted, the latch-up is not generated. On the other hand, where the interface voltage VDDQ is earlier inputted to a terminal 8, the N well bias circuit 9 and the P well bias circuit 10 are activated through a bypass circuit 15, and the N-type well 12 and the P-type well 13 are biased. Accordingly, although the chip voltage VDD is inputted after that, the latch-up is not generated.
摘要:
A process for producing a high-purity naphthalenedicarboxylic acid having an improved hue or an excellent hue from a crude naphthalenedicarboxylic acid obtained by the oxidation of dialkyl naphthalene, industrially advantageously at high yields, which comprises dissolving a crude naphthalenedicarboxylic acid obtained by the oxidation of dialkyl naphthalene in an aqueous solution containing an aliphatic amine, an alicyclic amine or acetonitrile, removing heavy metal components contained as impurities until the content of the heavy metal components based on the crude naphthalenedicarboxylic acid is 100 ppm or less, and heating the aqueous solution containing a naphthalenedicarboxylic acid amine salt to distill off the amine.
摘要:
A process for preparing an acrylamide polymer is herein disclosed which comprises the step of initiating polymerization in the presence of an oxidation-reduction system polymerization initiator comprising two or more kinds of oxidizing agents and a reducing agent. According to this process, the polymerization rate can be remarkably increased without bringing about a decrease in the molecular weight of the polymer, and hence, restriction on manufacturing facilities and apparatuses can be relieved and productivity can be remarkably enhanced, which permits a decrease in manufacturing cost.
摘要:
An miniaturized accelerometer having a narrow bandwidth and behaving as a switch sensitive only to low frequencies such as contained in earthquakes includes: a unbalanced see-saw beam assembly composed of beams 2 and masses 3 at opposite ends of the beams 2. The beams 2 have their suspension at a location with slightly different distances from the masses 3 along a line parallel to and vertically offset from the line connecting centers of gravity of the masses 3.
摘要:
A suspension system for a vehicle which has a hydraulic cylinder that extends and retracts in accordance with a change in the distance between a vehicle body and an axle to vary the volumetric capacity of a working chamber defined therein, an accumulator connected to the working chamber in the hydraulic cylinder, a control valve controlling the flow rate of oil charged into and discharged from the accumulator and the hydraulic cylinder, and a vehicle level sensor detecting a change in the above-described distance. The suspension system further has a control unit that controls the control valve, on the basis of a flow control signal obtained by multiplying the detected signal from the vehicle level sensor by an amplification factor, so as to restore the vehicle to a neutral state. The control unit is arranged to increase the amplification factor when the amount of the extension or retraction of the hydraulic cylinder is close to the extent of the full stroke thereof. When the vehicle is running on a normal road surface, the suspension system absorbs any changes in the road surface, thereby stably maintaining the attitude of the vehicle body, and in the case of large irregularities, it is possible to prevent full rebound or full bump which would otherwise occur when the hydraulic cylinder performs a full-stroke operation.
摘要:
The invention provides for a lithium secondary battery using a non-aqueous solvent wherein the anode material is prepared by the pyrolysis of organic compound starting materials obtained by reacting at least one conjugated polycyclic compound with a nitro compound or with a nitrating agent. The anode material contains at least the elements carbon and nitrogen, the nitrogen content ranging from 0.5% to 6% by weight. Eighty percent or more of this nitrogen is bound to carbon by either C--N or C.dbd.N bonds. The ratio of the intensity of the x-ray photoelectron spectroscopy ("XPS") peak observed for the anode material at 401.2.+-.0.2 eV to the intensity of peak observed for the anode material at 398.8.+-.0.4 eV is 1.0:1 or more.
摘要:
In a closed type thermal power generation plant, the fuel is supplied in the combustor and burnt therein in the presence of oxygen, instead of air. The combustion gas mainly including water and carbon dioxide is delivered from the combustor into the turbine. A turbine exhaust gas is fed into the waste heat boiler to carry out heat exchanging operation therein and an exhaust gas mainly including water component and carbon dioxide from the waste heat boiler is fed into the condenser. The gas component mainly including the carbon dioxide is separated from the condensate in the water-gas separator and may be fed into the combustor in a compressed state, or the separated gas component may be recovered externally to the plant without emitting the same into the atmosphere. The separated condensate is fed into the waste heat boiler to be subjected to heat exchanging operation therein to generate superheated steam which is to be fed into the combustor, or may be recovered externally.Further, a steam turbine may be connected to the waste heat boiler and generator. A condensor may then be connected to the steam turbine and waste heat boiler so that the steam turbine, condenser and waste heat boiler constitute a closed cycle.