No abstract

It is demonstrated that two-photon polymerization can be employed as a basis for a technology for the fabrication of three-dimensional micro-and submicrostructures, including structures with a periodically alternating refractive index. The rate of polymerization, energy expenditure, and required radiation doses characteristic of two-photon polymerization are estimated. The possibility to apply two-photon polymerization in the bulk of a medium to fabricate three-dimensional photonic crystals in the optical range is discussed.

Датчик статического и полного давления на основе линейки фотоэлектронных приемников 227

Information on the parameters of static atmospheric pressure and total pressure of the incoming air flow is the primary information in the air signal system, which is part of the integrated aircraft control system. This information makes it possible to calculate the altitude and speed of the aircraft for automated and automatic control. Static and total pressures are measured by aerometric parameter sensors, whose technical characteristics largely determine the range and values of the measurement accuracy of the air signal system. Relying on the requirements for aircraft flight safety and in accordance with the existing standards for horizontal and vertical separation, rather stringent requirements are imposed on the accuracy of air pressure measurement. Instrumental errors in measuring static and total air flow pressures with a probability of 0.95 should not exceed 0.02 and 0.05 % of the measurement range. The considered original aerometric pressure sensor based on an optical rule, whose high sensitivity requires minimal deformation of the elastic sensitive element, makes it possible to fulfill these requirements. The non-contact digital information retrieval and the operation of the information system under vacuum conditions significantly increased the efficiency of measurement processes. The paper focuses on an algorithm for calculating the main design parameters of elastic sensitive elements in almost the entire range of their standard sizes taking into account the technical capabilities of the secondary converter. The results of the experiments and experimental studies confirmed the sufficiency of theoretical methods for calculating the parameters of elastic elements for pressure sensors

Corrosion, erosion, abrasion and chemical attack of process equipment is a challenge that costs the Oil and gas industry billions per year. Although corrosion/wear/chemical resistant coatings are commonly in use today, enhanced performance requires improved polymer coating materials and coating methods. In the past 20 years coating technology has come far in terms of material development and also in terms of documenting real results. The objective of this paper is to outline the advances and benefits of composite coatings in the oil and gas industry. Facing the challenge to replace expensive materials and technologies with the use of composites delivers to the Oil&Gas industries savings measured by the duration of the protection, saved time for replacement and use of non expensive materials as a substrate. This can be achieved with the use of technology that provides faster and repairable methods of surface treatment and adding the value of improved equipment efficiency.