A first fastener component (26) is secured to an inner aircraft skin surface (6) by a mounting flange (12) and extends across a discontinuity (8) in the skin (2). A second fastener component (28) is secured to a rib (24) on the inner surface of a resilient blade (22) and extends through the discontinuity (8) into engagement with the first component (26). Inward pressure on the blade (22) urges the components (26, 28) into releasable locked engagement with each other. The components (26, 28) secure the blade (22) in a flattened use position in which it is substantially flush with and sealingly engages the outer skin surface (4). The blade (22) may be removed by inserting a tool under it and exerting a lifting force to disengage the components (26, 28). The blade (22) may be dimensioned to cover the outer ends of adjacent fasteners (14) extending through the skin (2). The blade (22) is preferably conductive to provide a continuous electrical path along the outer skin surface (4) across the discontinuity (8).

Removable seal for discontinuities in aircraft skin

This invention relates to improved aluminous cement/gypsum compositions that contain polymer latex emulsions or compounds to produce self-curing, crack-free, fast-setting, high early strength, high bonding, water resistant, durable, cementitious mixtures for finishing, coating, plastering, stucco, rigid insulation protection, topping, resurfacing, patching, motaring, tile grouting, concrete, and the like. In addition, this invention discloses a method for improving the properties and performance of aluminous cement/gypsum compositions by adding certain types, amounts and/or combinations of polymer latex emulsions or compounds with or without the addition of wet expansion and drying shrinkage inhibitors.

Utilization of latexes with hydraulic cement and gypsum compositions

The concept of dual-excitation dual-emission (DE2) phosphors for the enhancement of solar energy conversion is introduced in this work. Doping alkaline earth cations as an aggregated energy trap wi...

Enhancing Solar Energy Conversion Efficiency: A Tunable Dual-Excitation Dual-Emission Phosphors and Time-Dependent Density Functional Theory Study

Improvement of persistent phosphorescence of Ca0.9Sr0.1S : Bi3+ by codoping Tm3+

Rare-earth calcium sulfide phosphors for cathode-ray tube displays

Verfahren zur herstellung von alpha-hydrogips und ii-anhydrogips

Effects of Incorporated Sodium on Photoluminescence and Particle Shapes of CaS : Ce Phosphors

Verfahren zur herstellung von gips in form von nadelfoermigem anhydrit ii

This disclosure deals with ettringite whiskers, methods of synthesizing such whiskers and ettringite whisker composites. The ettringite whiskers, having a new crystal form, are 1-2 μm in diameter, 50-100 μm in length and approximately 30-50 of aspect ratio. The ettringite whiskers are especially useful in industry as a high tensile strength reinforcement, they increase self-extinguishability and the productive capacity of making sheets, boards of the like.

Novel ettringite whiskers, production and uses

イオンクロマトグラフィーにより硫酸カルシウム溶液中の微量のクエン酸イオンを分離定量するのに2種類の分離カラムを使って検討した。有機酸分析用カラムを使用するには,試料中の硫酸イオン濃度を下げなければならないが,水酸化バリウム飽科溶液の適量を試料に添加するとクエン酸イオンへの影響を少なくして硫酸イオンを除去できることがわかった。さらに,カラム内で硫酸イオンを除去するバリウム形交換カラムとUV検出器を併用すると720mg/lの硫酸イオンが共存する溶液中の約5mg/lのクエン酸イオンを分離定量できた。この場合のクエン酸イオンの検出限界は1mg/lであった。陰イオン分離カラムを使用するときはイオンクロマトグラフに付属しているバルブを利用する。2本の分離カラムの間にバルブを配置し,1番目のカラムで硫酸イオンとクエン酸イオンと分離する。さきに溶離した硫酸イオンはこのバルブをつかって系外に排出し,一方,クエン酸イオンは2番目のカラムで再度分離する。硫酸イオンがクエン酸イオンへ影響することもなく微量のクエン酸イオンを定量することができた。硫酸イオンが1400mg/l共存してもクエン酸イオン濃度が1から20mg/lの範囲で検量線はよい直線性を示した。この場合,クエン酸イオンの検出限界はO.1mg/lであった。

https://www.jstage.jst.go.jp/article/nikkashi1972/1987/6/1987_6_1016/_pdf

Hiroshi Matsui

Papers

Verfahren zur herstellung von alpha-hydrogips und ii-anhydrogips

Effects of Incorporated Sodium on Photoluminescence and Particle Shapes of CaS : Ce Phosphors

Verfahren zur herstellung von gips in form von nadelfoermigem anhydrit ii

Novel ettringite whiskers, production and uses

Determination of citrate in calcium sulfate by ion chromatography.