Facile synthesis of visible light excited La_1-xGd_xF₃:Eu³⁺ micro-meter sphere using polyvinylpyrrolidone as a template

Lanthanide fluorides exhibited unique luminescent properties in terms of their low phonon energy can restrict the luminescence quenching and extend luminescent lifetimes.Here,a room-temperature co-precipitation method was used to synthesize europium(III) activated La1-xGdxF3 solid phosphors.X-ray diffraction(XRD) data confirmed the crystalline phases of synthesized sample belongs to orthorhombic system.All the as-derived materials exhibited red luminescence(5D0→7F1) under the excitation at longer wavelengths(394 and 466 nm).The powder with the most intense emission was achieved in terms of 10 mol.% doping concentration(Eu content,La/Gd=1/9) and sample sintered at 700 oC.Scanning electron microscopy(SEM) investigated the morphology and crystalline of the samples,showing that many regular and large balls(5-10 μmol/L) were dispersed within the micro-meter scale composites.We proved that the above crystal growth structures were controllable and predicable based on the surface functionalization by polyvinylpyrrolidone ligand.     

数字逻辑式小麦水份控制仪的研制

用容积式电容器测量不同含水量小麦的电容值时发现,不同含水量的小麦所测得电容值不同;进一步研究发现:不同含水量的小麦电介常数不同.根据这一性质就可利用容积式电容器作为测定小麦水份含量的传感器.在仪器工作时钟信号控制下用容积式电容传感器对小麦进行定期检测,所测结果经数字逻辑电路分析处理后进行闸阀开度的控制,从而达到控制小麦着水量的目的.     

小麦籽粒机械特性对制粉工艺的影响

深入研究小麦籽粒组织结构与小麦着水调质后组织结构与力学特性的变化规律。充分利用水分调质手段，对小麦各组织结构与力学特性进行控制，保证小麦各组织结构机械特性的适应性，有利于提高面粉出品率、保证产品质量、降低碳排放。     

正压气力输送系统的快速经验计算

分析小麦制粉车间正压气力输送系统,把握重要环节,对压运过程关键因素进行对比分析、研究,找出小麦制粉压运系统设计计算过程的关键因素,使小麦制粉压运系统设计计算过程简化。