Abstract: A volume interrogation system can use an accelerated beam of charged particles to interrogate objects using charged-particle attenuation and scattering tomography to screen items such as portable electronic devices, packages, baggage, industrial products, or food products for the presence of materials of interest inside. The exemplary systems and methods in this patent document can be employed in checkpoint applications to scan items. Such checkpoint applications can include border crossings, mass transit terminals (subways, buses, railways, ferries, etc.), and government and private-sector facilities.

Abstract: A volume interrogation system can use an accelerated beam of charged particles to interrogate objects using charged-particle attenuation and scattering tomography to screen items such as portable electronic devices, packages, baggage, industrial products, or food products for the presence of materials of interest inside. The exemplary systems and methods in this patent document can be employed in checkpoint applications to scan items. Such checkpoint applications can include border crossings, mass transit terminals (subways, buses, railways, ferries, etc.), and government and private-sector facilities.

Abstract: A volume interrogation system can use an accelerated beam of charged particles to interrogate objects using charged-particle attenuation and scattering tomography to screen items such as electronic devices, packages, baggage, industrial products, or food products for the presence of materials of interest inside. The apparatus, systems, and methods in this patent document can be employed in checkpoint applications to scan items. Such checkpoint applications can include border crossings, mass transit terminals (subways, buses, railways, ferries, etc.), and government and private-sector facilities.

Abstract: A volume interrogation system can use an accelerated beam of charged particles to interrogate objects using charged-particle attenuation and scattering tomography to screen items such as electronic devices, packages, baggage, industrial products, or food products for the presence of materials of interest inside. The apparatus, systems, and methods in this patent document can be employed in checkpoint applications to scan items. Such checkpoint applications can include border crossings, mass transit terminals (subways, buses, railways, ferries, etc.), and government and private-sector facilities.

Abstract: A volume interrogation system can use an accelerated beam of charged particles to interrogate objects using charged-particle attenuation and scattering tomography to screen items such as portable electronic devices, packages, baggage, industrial products, or food products for the presence of materials of interest inside. The exemplary systems and methods in this patent document can be employed in checkpoint applications to scan items. Such checkpoint applications can include border crossings, mass transit terminals (subways, buses, railways, ferries, etc.), and government and private-sector facilities.

Abstract: This invention involves an apparatus to measure the nuclear quadrupole (NQR) response of a specimen using three frequencies. Three-frequency NQR involves excitation of at least two transitions that causes an observed signal at a third transition frequency. Thus, the transition excited and detected is not irradiated at all. This reduces undesirable interfering signals due to the excitation, for example as a result of acoustic ringing and/or tank circuit ring-down, since the excitation is not applied at the frequency that is detected. This invention will be particularly useful to detect substances selected from the group consisting of explosives and narcotics using nitrogen NQR.

Abstract: This invention involves an apparatus to measure the nuclear quadrupole (NQR) response of a specimen using three frequencies. Three-frequency NQR involves excitation of at least two transitions that causes an observed signal at a third transition frequency. Thus, the transition excited and detected is not irradiated at all. This reduces undesirable interfering signals due to the excitation, for example as a result of acoustic ringing and/or tank circuit ring-down, since the excitation is not applied at the frequency that is detected. This invention will be particularly useful to detect substances selected from the group consisting of explosives and narcotics using nitrogen NQR.

Abstract: This invention relates to a solid catalyst having the following formula for preparing nitrites and its preparation, in particular which contains molybdenum and phosphorus, etc. as main component which can improve the conversion and the selectivity in case of using as a catalyst during the process for preparing a heteroaromatic nitriles.Mo.sub.x P.sub.y O.sub.z X Ywherein,Mo is molybdenum;P is phosphorus;O is oxygen;X is ammonium salt or ion;Y is water; andx,y and z are respectively a number of atom, wherein y/x is 0.01.about.5 and z is 0.01.about.10.

Abstract: This invention relates to a vapor phase process for preparing cyanopyrazine, in particular which is reacting 2-methylpyrazine with ammonia and oxygen over molybdenum-phosphorus oxide-based catalyst of the following formula having the high selectivity and conversion.Mo.sub.x.P.sub.y.O.sub.z.X.Ywherein,Mo is molybdenum;P is phosphorus;O is oxygen;X is ammonium ion;Y is water; andx,y and z are respectively the numbers of atoms Mo, P and O, wherein y/x is 0.01 to 5 and z is 0.01 to 10.

Abstract: A process for purifying a crude terephthalic acid obtained by neutralization of the disodium terephthalate from alkali waste water from a polyester fabric-treatment process, into polymer grade terephthalic acid. The crude terephthalic acid is crushed, and fed to the kiln at 150.degree.-300.degree. C. for thermal treatment in an aqueous solution. The ammoniated, and the impurities in the solution are removed by adsorption followed by deammoniation, which may be accomplished by heating or by treatment with sulfuric acid.

Abstract: Universal signaling service unit for providing such signal that required to connection and progress of calling in time-division electronic switching system. The invention, in constitution that TSU, TSP, ASTU, ASIP, DTIU, DTIP, FIU, FIP, USTU, LSIP, IPCB, ASP are made to cooperate together, is organized such that: PCM signal data are transmitted and received by the control via telephony device-bus TD-bus, fault status is informed via alarm bus, various service functions requiring real time process are commonized to make one universal signaling tranceiver assembly USTA, signaling service function in USTA is divided into signal tone transmitting and receiving mode service group, and standby mode service group, and USTU is divided into USTU .0. and USTU 1; wherein USTA block is organized with TD-bus interface block, control block, sending block, receiving block, SHW interface block, and messages of FIGS.

Abstract: Pyrazines having the formula (I) ##STR1## wherein R is H, methyl, or ethyl are prepared by passing a hydrogen stream containing corresponding diamines having the formula (II) ##STR2## wherein R is same as previously defined, over a copper-chromite catalyst which has been once reduced at 300.degree.-450.degree. C. in a hydrogen-containing stream.