The present invention discloses a glass scintillator for detecting thermal neutron and its preparation method. It is characterized by that it uses Ce3+ as lithium-6 glass scintillation material, the lithium element is existed in the glass scintillator in the form of lithium-6 isotope, and has the action of producing nuclear reaction. The luminous efficiency of glass scintillator obtained by making raw materials undergo the three steps of preparing material, melting and annealing is 12% of NaI(T1), strongest emission wavelength is about 400nm, UV cut-off wavelength is 360nm, luminous decay time is about ns and thermal neutron detection efficiency is about 90%. Said glass scintillator mainly is used for detecting thermal neutron, and also can be used for detecting alpha ray, beta ray and gamma ray, etc.
The invention discloses a zero-valent iron carrying nanometer composite resin for catalytic degradation of pollutants and a preparation method thereof. The zero-valent iron nanometer composite resin has the following structures: (1) the carrier of the nanometer composite resin is an ion-exchange and adsorption resin having alkali functional group; (2) the internal and external surfaces of the carrier support nanometer sized zero-valent iron series inorganic materials. The zero-valent iron nanometer composite resin is prepared by leading FeCl4 ion onto the internal and external surfaces of the resin by ion-exchange, deoxidizing the FeCl4 ion into nanometer zero-valent iron and obtaining the zero-valent iron carrying nanometer composite resin by washing and drying under the protection of N2. The composite resin integrates the Donnan preenrichment effect of the resin on the inorganic anionic pollutants in the water body and the high-efficient catalytic degradation effect of the nanometer zero-valent iron on the environmental pollutants, overcomes the shortcomings of easy conglobation, unstable chemical property, small particles and big loss of the pressure head of the nanometer zero-valent iron particles and has fast, high-efficient and low-cost catalytic degradation toward the micro-pollutants in the environment.
The invention discloses an intelligent control method and an intelligent controlsystem for an offshore petroleum platform power grid, and relates to a method and a system for monitoring an offshore oilfield group power grid. The method comprises that a wide-range intelligent monitoring system and a multi-target coordinated optimization operating system are arranged; the multi-target coordinated optimization operating system carries out restricted non-linear optimization on corresponding targets on the basis of synchronous data collected by the wide-range intelligent monitoring system; and an intelligent self-healing control system carries out control strategy decision making according to optimization results and automatic control on relay protection, switches, automatic safety devices and automatic adjusting devices. The system disclosed by the invention comprises the wide-range intelligent monitoring system, a dynamic early warning system, the multi-target coordinated optimization operating system and the intelligent self-healing control system. The intelligent control method and the intelligent control device solve a problem that the safety and the economy of the power grid cannot be precisely monitored and evaluated because of incomplete information, varied operating modes and uncertainty of model parameters, and problems of coupling of multiple control targets and coordination of multiple control measures of the offshore oilfield group power grid in a complex operating environment, thereby realizing comprehensive regulation of reactive power and active power of the power grid, and achieving an objective of automatic optimization operation.
The invention discloses a dynamic force sensor sensitivity calibration method and device. The method comprises steps that siliconegrease is filled between a calibration force sensor and a standard acceleration sensor fixing surface; M mass blocks are respectively arranged on a standard acceleration sensor for measurement, and the M is not smaller than 2, a vibrator is driven to generate vibration, output voltage signals of a standard acceleration gauge and a to-be-calibrated force sensor and acceleration detected by the standard acceleration gauge are acquired, and sensitivity of the to-be-calibrated force sensor is calculated according to the acquired signals. According to the method and the device, a fixing method of the to-be-calibrated force sensor and the standard acceleration sensor is realized, a specific dynamic calibration precision expression of the force sensor is acquired through derivation, no-suspension mounting requirement is proposed for the standard mass blocks, operation difficulty is reduced, and measurement precision and reliability are easily guaranteed.
The invention aims at provides a preparation method of an NiCrAlYSi powder spraying material. The method adopts a technology of 'mother alloy pre-preparation and ultrasonic gas atomization' and a purpose of uniform control for chemical components of powder is achieved. The method comprises the specific steps that (1), a mother alloy is pre-prepared by a vacuum induction heating method; raw materials are placed into a magnesia crucible, with forvacuum degree higher than 2Pa, refining temperature of 1390-1430 DEG C, refining period of 15-20min, and casting temperature of 1420-1460 DEG C; the raw materials are cooled and cast to an alloy bar with a diameter of 70-100mm; (2) component analysis is conducted on the obtained mother alloy; if components of the obtained alloy exceed a proportion of the chemical components of the NiCrAlYSi powder, secondary stock preparation is conducted according to the proportion; (3), gas atomization pulverization is conducted, with atomization temperature of 1500-1530 DEG C, atomization pressure of 8-10MPa, gas flow of 10-15m<3> / min, alloy liquid flow of 2-4kg / min, and an atomization medium of pure argon.