Abstract:
A communication apparatus communicates by switching between a first communication period in which contention access control is performed and a second communication period in which non-contention access control is performed. The apparatus determines the state of access contention in the first communication period, changes the frequency bandwidth of the first or second communication period in accordance with the determination and changes the time ratio between the first communication period and the second communication period in accordance with the change of frequency bandwidth.
Abstract:
The present invention relates to a fluorescent lamp including: a discharge space containing a discharge gas and being surrounded by a glass; a discharge electrode; a phosphor; and a mayenite type compound provided on at least a part of an inner surface contacting the discharge gas. According to the fluorescent lamp of the present invention, a fluorescent lamp that has good luminous efficiency of ultraviolet ray from a discharge gas, has good discharge characteristics such as discharge starting voltage and discharge sustaining voltage in a fluorescent lamp, is chemically stable, has excellent oxidation resistance, has excellent sputtering resistance, and can achieve electric power saving is provided.
Abstract:
A communication system includes a first communication terminal configured to comply with a plurality of communication methods, and a second communication terminal that complies with any one of the communication methods, wherein the first communication terminal includes a network creating unit configured to transmit a notification signal including information about a network to create a network that complies with any one of the communication methods, a checking unit configured to check history information about a communication between the first communication terminal and the second communication terminal according to a notification signal including information about a network different from the network that has been created by the network creating unit, while the network creating unit has created the network, and a communication control unit configured to cause the first communication terminal to join the network created by the second communication terminal based on the history information.
Abstract:
A glass ceramic composition which consists essentially of an inorganic material powder having a melting point or a glass transition point of at least 1,000° C. and a glass powder having a glass transition point of from 450 to 800° C., wherein the average of the major axes L of particles of the above inorganic material powder is from 0.5 to 15 μm, and the average of the ratios L/W of the major axes L to the minor axes W is at most 1.4. Further, a glass ceramic composition which consists essentially of, as represented by mass percentage, from 10 to 58% of an inorganic material powder having a melting point or a glass transition point of at least 1,000° C. and from 42 to 90% of a glass powder having a glass transition point of from 450 to 800° C., wherein the glass powder consists essentially of, as represented by mol %, SiO2: 35 to 70%, B2O3: 0 to 30%, Al2O3: 3 to 18%, MgO: 0 to 40%, CaO: 0 to 19%, BaO: 0 to 35% and ZnO: 0 to 9%.
Abstract:
A telephone has a speech detection circuit connected to a microphone so that an external line lamp is turned off when a transmitting signal is detected by the speech detection circuit or when a dial key is pressed. When a hold key is pressed, power for a transmission section is turned off while power for a receiving section is turned on. The power for the transmission section is turned on in response to key input or receiving of a control signal.
Abstract:
A hybrid package comprising a glass ceramic substrate and an aluminum nitride substrate bonded thereto, said glass ceramics substrate has a thermal expansion coefficient substantially the same as that of the aluminum nitride substrate.
Abstract:
When performing data communication with a second wireless communication apparatus having a plurality of antennas by using a plurality of transmission channels formed by spatial multiplexing, a first wireless communication apparatus having a plurality of antennas determines whether the second wireless communication apparatus is capable of communication using the plurality of transmission channels, and, on the basis of the determination result, executes a calibration process of forming the plurality of transmission channels with respect to the second wireless communication apparatus.
Abstract:
To provide a method for preparing a mayenite-containing oxide containing a mayenite type compound and having a hydride ion density of at least 1×1018/cm3 without need for expensive facilities, control of complicated reaction conditions or a long period of reaction time. A method for preparing a mayenite-containing oxide, which comprises a firing step of heating a starting material having a molar ratio of CaO:Al2O3 being from 9:10 to 14:5 based on the oxides at a temperature of from 900 to 1,300° C. to obtain a fired powder and a hydrogenation step of firing the fired powder at a temperature of at least 1,210° C. and lower than 1,350° C. in a hydrogen-containing gas having an oxygen partial pressure of at most 1,000 Pa to obtain a mayenite-containing oxide containing a mayenite type compound and having a hydride ion density of at least 1×1018/cm3, and a method for preparing an electroconductive mayenite-containing oxide, which comprises irradiating the obtained mayenite-containing oxide with an ultraviolet ray etc. to obtain a mayenite-containing oxide containing an electroconductive mayenite type compound.
Abstract:
The present invention relates to a method for producing an oxide containing a conductive mayenite type compound and having an electron concentration of 1×1018/cm3 or more, from a raw material which is a combination of a calcium compound and an aluminum compound or is a compound containing calcium and aluminum, each having a molar ratio of calcium oxide and aluminum oxide ranging from 9:10 to 14:5 in terms of the oxides, the method including the steps of: heating and holding the raw material at 900 to 1,300° C. to produce a calcined powder containing at least one oxide selected from the group consisting of a calcium aluminate, calcium oxide and aluminum oxide; and heating and holding the calcined powder at 1,200° C. to less than 1,415° C. under a reduction atmosphere in an inert gas atmosphere or a vacuum atmosphere each having an oxygen partial pressure of 1,000 Pa or less.
Abstract:
A method for producing a laminated dielectric, which comprises laminating a raw material layer containing a high dielectric constant glass ceramic composition comprising from 30 to 70 mass % of a Ba—Ti compound powder having a Ti/Ba molar ratio of from 3.0 to 5.7 and from 30 to 70 mass % of an alkali free glass powder containing, by mol %, from 15 to 40% of SiO2, from 5 to 37% of B2O3, from 2 to 15% of Al2O3, from 1 to 25% of CaO+SrO, from 5 to 25% of BaO and from 25 to 50% of SiO2+Al2O3, and a raw material layer containing a low dielectric constant glass ceramic composition comprising from 10 to 70 mass % of a ceramic powder and from 30 to 90 mass % of an alkali free glass powder wherein SiO2+Al2O3 is at least 34 mol % and larger by at least 9 mol % than that in the above alkali free glass powder, followed by firing.
Abstract translation:一种叠层电介质的制造方法,其特征在于,将包含30〜70质量%的Ti / Ba摩尔比为3.0〜5.7的Ba-Ti系化合物粉末的高介电常数玻璃陶瓷组合物的原料层层叠, 30〜70质量%的无碱玻璃粉末,其含有摩尔%,15〜40%的SiO 2,5〜37%的B 2 O 3,2〜15%的Al 2 O 3,1〜25%的CaO + SrO,BaO 5〜25%,SiO 2 + Al 2 O 3 25〜50%,以及含有10〜70质量%的陶瓷粉末和30〜90质量%的低介电常数玻璃陶瓷组合物的原料层 %的无碱玻璃粉末,其中SiO 2 + Al 2 O 3比上述无碱玻璃粉末中至少34摩尔%且大至少9摩尔%,随后进行烧制。