First record of the tropical genus Rambutanura (Collembola: Neanuridae: Neanurinae) in Palearctic, with description of a new species from China.

Genus Rambutanura Deharveng, 1988 of subfamily Neanurinae is herein recorded and a new species is described from China. A key to the species of the whole world of the genus is provided. In order to determine the new species, a new diagnosis within the genus Rambutanura Deharveng, 1988 is proposed. The new species is distinguished from all known members of the genus by its unique set of morphological characters notably: 2+2 depigmented eyes, mandible quadridentate, presence of 1 additional s-chaeta on each tubercle Di from Th. I to Abd. IV, presence of 2 additional s-chaetae on tubercle Dl from Abd. I to Abd. V, presence of guard chaetae sgd and sgv on AOIII, absence of digitate body tubercles.

[Accuracy analysis on a sort of polarized measurement in remote sensing].

Angular error of polarizer in polarimetric measurement is an important element affecting the measurement accuracy of degree of polarization, so angular error of polarizer should be considered in remote sensing of high-accuracy quantitative polarization. Simulation study shows that polarimetric measurement is relative to the polarization state (polarization angle or degree of polarization) of incident light in a specific measurement system of polarization. In the measurement mode of polarizer setting (0 degree, 60 degrees, 120 degrees), there is a maximum error of polarization measurement at the 0 degree or 180 degrees polarization angle while a minimum error at the 30 degrees, 90 degrees and 150 degrees polarization angle; In the measurement mode of polarizer setting (0 degree, 45 degrees, 90 degrees), there is a maximum error of polarization measurement near the 45 degrees polarization angle while a minimum error at the 0 degree, 90 degrees and 135 degrees polarization angle. The larger degree of polarization of incident light often contributes to the bigger measurement error except for incident light with several polarization angles. So the polarization measurement may be evaluated by the average degree of polarizatioo of linearly polarized light introduced in this paper. It is indicated that the measurement mode of polarizer setting (0 degree, 60 degrees, 120 degrees) is better than that of (0 degree, 45 degrees, 90 degrees).