Abstract: The present invention relates to a process for preparing an aqueous solution of sulfonated melamine-formaldehyde resin, and a cement composition in which the solution and a setting retarder are added to a concrete, a mortar, a cement paste or the like. And the process comprises the following step (A), step (B) and step (C): Step (A): a step of adjusting an aqueous solution containing melamine (a), formaldehyde (b), sulfanilic acid (c) and an alkali substance (d) to (a):(b):(c)=1:2.5-3.5:0.5-1.5 in molar ratio and its pH to 8.0-13.5, and thereafter heating the aqueous solution at 50-90° C. to conduct the reaction until free sulfanilic acid decreases to 40-90 mol % of the amount of sulfanilic acid charged; Step (B): a step of adding an inorganic acid to the reaction liquid obtained in the step (A) to adjust its pH to 6.0-8.0, and thereafter heating the reaction liquid at 50-90° C.

Abstract: A transistor circuit that ensures signal transmission between adjoining direct-coupled stages at a low supply voltage even when an input signal is in a high level. This transistor circuit is comprised of a first stage having a first transistor and a first load connected to a collector or drain of the first transistor, and a second stage having a second transistor. An input voltage is applied to a base or gate of the first transistor in the first stage. The first transistor produces a first output current flowing through the first load according to the input voltage, thereby outputting a first output voltage at the collector or drain of the first transistor The first output voltage from the first stage is applied to a base or gate of the second transistor in the second stage without using any coupling capacitor. The first load has a variable resistance responsive to a magnitude of a dc component of the first output current.

Abstract: A radio paging receiver which stores messages accompanied by paging calls into directories corresponding to paging numbers and displays the stored messages in a particular directory together and successively, in which the directory which has the highest preferential ranking to display stored messages is determined by an user of the radio paging receiver, or from among the directories which correspond to a plurality of paging numbers selected by the user the highest preferential display ranking is given to the directory corresponding to the paging number of the latest paging call

Abstract: The present invention relates to a process for preparing an aqueous solution of sulfonated melamine-formaldehyde resin, and a cement composition in which the solution and a setting retarder are added to a concrete, a mortar, a cement paste or the like. And the process comprises the following step (A), step (B) and step (C): Step (A): a step of adjusting an aqueous solution containing melamine (a), formaldehyde (b), sulfanilic acid (c) and an alkali substance (d) to (a):(b):(c)=1:2.5-3.5:0.5-1.5 in molar ratio and its pH to 8.0-13.5, and thereafter heating the aqueous solution at 50-90° C. to conduct the reaction until free sulfanilic acid decreases to 40-90 mol % of the amount of sulfanilic acid charged; Step (B): a step of adding an inorganic acid to the reaction liquid obtained in the step (A) to adjust its pH to 6.0-8.0, and thereafter heating the reaction liquid at 50-90° C.

Abstract: A wireless selective call receiver includes an operation unit having at least one operation element which is operated by a user. A detecting unit detects a first predetermined operation of the operation element in a normal mode to generate a menu display signal, and detects a second predetermined operation of the operation element in a selection mode to generate an item designation signal. A control unit controls a display unit to display a predetermined type of data in the normal mode. The control unit responds to the menu display signal to set the selection mode and to control the display unit to display a first menu such that items of the first menu are scrolled while each of the items of the first menu is displayed one by one in a predetermined area. The control unit selects a specific one of the items of the first menu in the selection mode in response to the item designation signal inputted from the detecting unit when the specific item is displayed in the predetermined area.

Abstract: Color LCD 7 of a radio selective calling receiver with a display function which displays, on the background of rows of letter characters displayed in blue, picture information such as a battery voltage drop mark in red, which is different from the displaying color of the letter characters, in the full area of the display screen.

Abstract: A radio selective calling receiver with display, having a plurality of functions which can be set by a user, including a menu window display unit for displaying the plurality of functions which can be set. A function use/disuse setting determination unit is provided for setting use/disuse of one of the plurality of functions displayed on a menu window, and a function limiting/displaying unit for displaying only functions for use on the menu window through the menu window display in function setting after setting use/disuse of the function.

Abstract: A direct conversion receiver includes a reference clock signal generating section for generating reference clock signal. An amplifier section amplifies a received signal and extracts a desired signal from the amplified signal. An extraction reference clock signal generating section frequency-divides the reference clock signal based on a frequency division data to generate first and second extraction reference clock signals. An extracting section extracts a data from the desired signal and the first and second extraction reference clock signals. A control and processing section outputs the frequency division data to the extraction reference clock signal generating section and processes the data based on a control section clock signal corresponding to the reference clock signal.

Abstract: A container for packing semiconductor wafer is provided which has superior airtightness to prevent contamination of the wafers by air. A gasket groove is formed on the case of the container. A gasket is inserted within the gasket groove. The gasket contains protrusions that assist in providing an airtight seal. The case and a lid are securely fastened together by the engagement of four clips within respective clip recesses that are formed in the container and lid.

Abstract: The present invention is directed to a hardening composition characterized by comprising (A) a slag composition containing 0 to 37 wt. % of CaO, 23 to 90 wt. % of SiO.sub.2, and 0 to 40 wt. % of Al.sub.2 O.sub.3 and 0.1 to 50 wt. % of one or more compounds selected from the group consisting of iron oxide, alkali components, phosphorous components, titanium dioxide, manganese oxide, and magnesium oxide, and/or 0.1 to 10 wt. % of a halogen; and (B) an alkaline activator. The invention is also directed to a hardened product obtained by mixing the hardening composition with water. The properties of the hardened product are suitable for use as various concrete materials, and therefore, refuse-incinerated ashes sewage sludge, etc. are effectively utilized and recycled as a resource.

Abstract: A selective calling radio receiver includes a message memory for distinguishably storing the message as non-read message and read message, and a control portion. The control portion performs a non-read alarm when the non-read message is stored in the message memory and a normal alarm when there is no non-read message stored therein. The control portion also has a function of performing a call alarm termination and display of message and storing the message in the message memory as a read message when a switch for requesting termination of the call alarm is pushed at a time of a call alarm and terminating the call alarm and storing the message in the message memory as a non-read message when the switch is not operate after a specific period of time.

Abstract: In a paging receiver equipped with a display, said display informing a user, when a paging number involved in received data is coincident with a paging number allocated to itself, of that fact with a calling ringing sound and displaying a received message, an inherent password is previously set, and when a password involved in the received data is coincident with the inherent password, alarming and display of the message are allowed, while when both passwords are not coincident with each other, a prohibition time zone of the alarming and the display previously set, and when the operation time is within the previously set prohibition time zone, the alarming/display is allowed but when the same is out of the prohibition time zone, the alarming/display is prohibited. Further, when the prohibition time zone is completed, the alarming is effected and a message received within the prohibition time zone is displayed.

Abstract: In a radio paging receiver in which a CPU (6) stores a received message in one of message areas of a message memory (8) as an unconfirmed message and in which an announcing section (11-18) carries out a call announcement in response to the received message, the CPU makes the announcing section announce an unconfirmed message full announcement instead of the call announcement when each message area is filled with the unconfirmed message and when an announcement stop instruction is not received from a keyboard (10) within a predetermined time interval from a time instant at which the call announcement is started. The unconfirmed message full announcement has an announcing pattern which is different from that of the call announcement.

Abstract: 3,7-Dimethyl-2,6-octadienylamine derivatives are produced by reacting isoprene with a secondary amine in the presence of a catalyst prepared by reacting a secondary amine, a conjugated diene and/or a polycyclic aromatic compound, a lithium salt and sodium and/or potassium metal.

Abstract: A device for rethreading and cleaning threaded pipe studs having an elongated casing having an outside surface provided with flat portions for attaching to a torquing means, which casing is provided with a straight channel therethrough shaped to allow passage of the pipe stud with at least a portion of the channel sidewalls having an inside diameter slightly larger than the outside diameter of the pipe studs, and having multiple threading dies attached to the channel sidewalls at one open end with the teeth protruding perpendicularly from the channel sidewalls, wherein the teeth on each threading die projects consecutively shallower into the channel as they progress from the open end.