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The invention relates to a movable fastening unit for a seat frame in an aircraft. In said fastening unit, a connecting element can be movably mounted on both a seat structure and a floor fixture by means of bearings, thus allowing the seat frame to be moved relative to the floor fixture without having to detach the fixture from the floor.

The invention relates to a movable fastening unit for a seat frame in an aircraft. In said fastening unit, a connecting element can be movably mounted on both a seat structure and a floor fixture by means of bearings, thus allowing the seat frame to be moved relative to the floor fixture without having to detach the fixture from the floor.

The invention discloses a four-dimensional air interface performance testing method of a dynamic scene channel. By constructing a time-domain non-stationary dynamic scene channel model, a probe selection algorithm is used to select a suitable number and position in a four-dimensional multi-probe anechoic chamber method (4D-MPAC) test system. The over-the-air (OTA) probe with power weights finally builds a 4D-MPAC dynamic channel test system for the target channel in the DUT test area, which contributes to solving the current OTA performance test problems of non-stationary channels in the time domain. The purpose of the present invention is to provide a four-dimensional multi-probe anechoic chamber method (4D-MPAC) of a dynamic scene channel, by constructing a dynamic scene channel model, on the basis of reducing the cost of the test system as much as possible, it can be effectively and accurately reproduced in the darkroom The target dynamic scene channel model is obtained, and the index for judging the construction accuracy of the dynamic scene channel model is given.

The invention discloses a lysozyme covalently modified by carboxylic acid type short fatty chain acyl-free sophorolipid derivatives as well as a modification method and application thereof. The modification method comprises the following steps: (1) dissolving active esters of sophorolipid derivatives in DMSO, then adding a NaHCO3 aqueous solution of the lysozyme, and carrying out condensation reaction under the stirring condition, thereby obtaining a reactant mixture after reaction, wherein the sophorolipid derivatives are the carboxylic acid type short fatty chain acyl-free sophorolipid derivatives; and (2) dialyzing the buffer solution system obtained in the step (1) by sequentially adopting deionized water and a phosphate buffer solution, and carrying out centrifugal separation on the obtained dialysate to obtain the modified lysozyme. The modified lysozyme can not only effectively inhibit the activity of gram positive bacteria but also obviously inhibit the activity of gram negative bacteria, so that the antimicrobial spectrum of the natural lysozyme is expanded, and the modified lysozyme can serve as a multifunctional food preservative.