摘要:
Methods and apparatus for monitoring formaldehyde vapor in a gas, comprising directing the gas into contact with an aqueous acidic solution that can dissolve the vapor and thus collect it therein, separating the gas from the solution, reacting the solution with a reagent to form from the collected formaldehyde a derivative that can be excited by radiation at a wavelength in the range of about 230 to 300 (typically 254) nanometers to fluoresce at a substantially different wavelength, irradiating the solution at a wavelength in said range for excitation, and measuring the intensity of the resulting fluorescence. Typically the fluorescence is measured at a wavelength in the range of about 450 to 550 nanometers and the irradiation and the measurement of fluorescence are carried out by means comprising conventional fluorometric means.
摘要:
Apparatus and method for providing breath for introduction to a measuring device such as a mass spectrometer. The apparatus includes a mouthpiece for interfacing a subject with the apparatus; a tube for carrying exhaled breath from the subject to the inlet of a mixing chamber; a mixing chamber having an inlet, sample outlet and exit tube, that provides a residence time for the exhaled breath sufficient to mix the breath and provide an adequate sample to the measuring device; and heating apparatus for maintaining the apparatus above a temperature where condensation of vapor occurs.
摘要:
There is disclosed a business communication terminal structure having a modular switchhook and cradle assembly which can be easily located on either side of the terminal housing to receive a telephone handset. The unused housing side surface aperture is covered using a blank tight fitting cover plate which blends with the terminal housing.
摘要:
A ration belt which may be worn around the waist or as a bandolier comprises an elongate sleeve of flexible plastics material such as PVC transversely sealed at locations along the sleeve to provide sealed pouches containing 24-hour one-man foodstuffs rations. The plastics sleeve can be clipped directly to the webbing harness or carried in a separate pouch.
摘要:
A digital certificate associating a unique identifier for a computer-based appliance with an authentication key pair for that appliance is obtained from a certificate authority using a different, manufacturing key pair for the appliance. The manufacturing key pair may be generated by the appliance at or about its time of manufacture. The public key portion of the manufacturing key pair along with the unique identifier for the appliance may be provided via secure means to the certificate authority prior to the request for the digital certificate concerning the authentication key pair. Eventually, the digital certificate associated with the authentication key pair may be used by the appliance when joining a network, as part of a one-way or two-way authentication process.
摘要:
A first computer-based device is authenticated at a second computer-based device communicatively coupled thereto through use of a unique identifier and an encrypted token, each received from the first device. Following the authentication, configuration information for the first device is sent from the second device to the first device and the first device is authorized to join a network that includes the second device. Further, permissions related to the network may be granted to the first device.
摘要:
Consistent with one embodiment of the invention, a wireless mobile device is configured to receive a configuration file from a configuration server. After receiving the configuration file, the wireless mobile device establishes a wireless communication session with a computing device within proximity of the mobile device. The mobile device is configured to send the configuration file to the computing device so as to enable a configuration application executing on the computing device to configure the computing device in accordance with configuration information included in the configuration file.
摘要:
A heating apparatus and method for pre-weld heat treating, welding and post-weld heat treating a superalloy article in a single enclosure while avoiding oxidation of the article. The enclosure is preferably equipped with a one-way valve that permits the escape of gases, but otherwise seals the enclosure to prevent the ingress of air during welding and heat treatment as a result of thermal gradients induced when the article is inductively heated. To provide access to the article and a device used to weld the article, the enclosure is equipped with gloves by which the welding device and the article can be manipulated while a nonreactive atmosphere is fully maintained within the enclosure and the article is inductively heating.