x
uploads/alkaline earth.jpg

alkaline earth 【化學】堿土。

In recent years , with the rapid development of laser and optical storage technology , alkaline earth sulfide ( aes ) doped with rare earth has aroused peoples “ attention 近年來,隨著激光和光存儲技術的飛速發展,稀土摻雜硫化物光存儲材料愈來愈引起人們的重視。

alkaline reaction

In manganite perovskites , substitution of divalent ions ( alkaline earth metals viz . ca , sr , ba ) in the a sublattice , introduces mn4 + ions or holes into the system . it is generally considered that the concentration of holes is equal to the concentration of divalent cations because of the charge compensation by controlled valencies 在類鈣鈦礦型晶體結構中通過摻入二價堿土金屬(如ca , sr , ba )可以在系統中產生mn ~ ( 4 + )或氧空位,由價格補償的原理,理論上摻入的二價離子的濃度和氧空位的濃度相等。

The systematically study of the preparation of alkaline earth sulfide system doped with rare earth and its optical storage properties not only expand new synthesize technology of electron trapping optical storage materials but also afford basis for improving materials properties and application in different application fields 稀土摻雜硫化物體系的制備及其光學性能的系統研究,不但為電子俘獲型光存儲材料拓展了新的合成技術,也為進一步提高材料的性能及其在不同領域的應用提供了依據。

In recent years , the colossal magneto - resistance effect in rare - earth manganite perovskites of the type lni . xaxmno3 ( where ln is rear - earth irons la2 + , nd2 + , p2 + ; a is alkaline earth iron ca2 + , sr2 + , ba2 + ) has attract considerable attention in scientific studies due to its potential application . however , the poor temperature dependence of mr and the low - temperature mr effect and the ideal mr only in high field severely limit their practical utility . in this work , we prepared manganite perovskite lai - xsrxmno3 and soft - magnetic ferrite materials fe2o3 and ( ni , zn ) fe2o4 by using sol - gel method separately 近些年來,人們發現在鈣鈦礦錳氧化物ln _ ( 1 - x ) axmno _ 3 ( ln為la , nd , pr等稀土金屬元素; a為ca , sr , ba等堿土金屬元素)中具有磁電阻( magnetoresistance )效應,由于它在磁記錄,磁傳感器方面具有廣泛的應用前景,同時也向傳統的磁記錄材料提出了挑戰,因而引起了物理學界的廣泛關注。

More recently , the perovskite manganite compounds , la1 - xsrxmno3 have been used as the cathode of the solid oxide fuel cell ( sofc ) because of their electro - ion conductivity properties . in manganite perovskites , substitution of divalent ions ( alkaline earth metals viz 近幾年來, la _ ( 1 - x ) sr _ xmno _ 3這類鈣鈦礦型結構的氧化物材料因為其具有混合電子-離子導電特性而被廣泛的應用于固體氧化物燃料電池陰極材料。

In recent years , with the rapid development of laser and optical storage technology , alkaline earth sulfide ( aes ) doped with rare earth has aroused peoples “ attention 近年來,隨著激光和光存儲技術的飛速發展,稀土摻雜硫化物光存儲材料愈來愈引起人們的重視。

Standard test method for determination of dissolved alkali and alkaline earth cations and ammonium in water and wastewater by ion chromatography 用離子色譜法測定水及廢水中溶解的堿及堿土陽離子及銨的標準試驗方法

Glass in building - thermally toughened alkaline earth silicate safety glass - part 2 : evaluation of conformity product standard ; german version en 14321 - 2 : 2005 建筑物玻璃.熱鋼化堿土硅酸鹽安全玻璃.第2部分:合格

The latter , which appeared in the tang dynasty , is to decoct the brine extracted from the ash or alkaline earth in flat plates “煎鹽”則指提取柴灰或堿土中的鹵水,用淺而闊的盤熬干以制取鹽,這一專稱唐代始見。

The development of solvent extraction separation of alkaline earth elements was reviewed , according to the classification of extractants 摘要本文就堿土金屬離子萃取分離的進展情況,按萃取劑的分類進行了綜述。

Glass in building - basic alkaline earth silicate glass products - part 2 : evaluation of conformity product standard ; german version en 14178 - 2 : 2004 建筑物用玻璃.基本堿土硅酸鹽玻璃制品.第2部分:合格

Glass in building - thermally toughened alkaline earth silicate safety glass - part 1 : definition and description ; german version en 14321 - 1 : 2005 建筑物用玻璃.熱鋼化堿土硅酸鹽安全玻璃.第1部分:定

Glass in building - thermally toughened alkaline earth silicate safety glass - part 2 : evaluation of conformity product standard 建筑物玻璃.熱鋼化堿土硅酸鹽安全玻璃.第2部分:合格評價產品標準

Study on the relationship between the melting point the hardness of the alkaline earth metal oxide and the electron structure 堿土金屬氧化物熔點和硬度變化規律與電子結構的關系

Glass in building - thermally toughened alkaline earth silicate safety glass - evaluation of conformity product standard 建筑物玻璃.熱鋼化堿土硅酸鹽安全玻璃.合格評價產品標準

Glass in building - thermally toughened alkaline earth silicate safety glass - part 1 : definition and description 建筑物玻璃.熱鋼化堿土硅酸鹽安全玻璃.第1部分:定義和描述

Glass in building - basic alkaline earth silicate glass products - part 1 : float glass ; german version en 14178 - 1 : 2004 建筑物用玻璃.基本堿土硅酸鹽玻璃制品.第1部分:浮法

Glass in building - basic alkaline earth silicate glass products - evaluation of conformity product standard 建筑物用玻璃.基本堿土硅酸鹽玻璃制品.合格評價產品標準

Glass in building - basic alkaline earth silicate glass products - part 2 : evaluation of conformity 建筑物用玻璃.基本堿土硅酸鹽玻璃制品.第2部分:合格評價