结晶条件对碳酸钕中氧化钕含量的影响

以碳酸氢铵作沉淀剂,从氯化钕料液中沉淀钕,经陈化结晶制备碳酸钕。研究了温度、加料比等结晶条件对结晶速度和结晶碳酸钕中氧化钕含量的影响。结果表明:随着结晶陈化温度的提高,结晶碳酸钕中氧化钕含量升高,而增大碳酸氢铵加入量则使氧化钕含量降低。当碳酸氢铵与氯化钕的物质的量之比控制在2.0∶1~3.0∶1,陈化温度控制在60℃以上,均可制得氧化钕含量在60%以上的碳酸钕结晶。     

添加镁离子对碳酸钙结晶形貌的影响

考察了溶液结晶法制备碳酸钙过程中添加镁离子的作用,得到2种形貌截然不同的球状碳酸钙.结晶体系中[Ca2+]∶[Mg2+]的大小对碳酸钙的晶相结构及形貌有显著影响其值在1.33～2.67的范围是碳酸钙形貌的过渡区,当>2.67时晶体呈现特殊的聚集台阶群生长现象,形成粗面类球形方解石聚晶体;而在<1.33时得到表面相对光滑的微球.合成条件中[Ca2+]∶[CO2-3]的大小对碳酸钙形貌的影响不明显.     

采用硫酸铵焙烧方法从低品位碳酸锰矿中富集回收锰

研究了采用硫酸铵焙烧法从低品位碳酸锰矿富集回收锰的工艺．将碳酸锰矿与（NH4）2SO4通过研磨混合均匀，在马弗炉中300～500％焙烧0．5～3h．将焙烧过程铵盐分解产生的氨气发二氧化碳气体通过真空通入上一次的浸出液，将硫酸锰沉淀下来．焙砂采用60—90％热水，在液固为（3～10）：1的条件下浸取10—20min，得到硫酸锰浸出溶液，作为下一次焙烧过程的吸收液，对吸收液巾过滤得到的滤饼进行干燥后得到锰精矿．吸收液过滤后得到的滤液蒸发浓缩，结晶后又得到了（NH4）2SO4固体，可以复用．采用该工艺的锰回收率达80％以上，是一种从低品位碳酸锰矿富集回收锰的新工艺。     

机组机械制动电磁阀控制程序的改进

对黄龙滩电厂4号机组机械制动电磁阀投入存在的问题进行了分析，并提出了改进方案，经实施运行后效果显著。     

东北区域电力市场发电报价网损修正算法研究

发电报价网损修正问题作为区域发电侧电力市场面临的主要问题之一，已受到各市场成员和许多学的普遍关注。作从公平性和经济性的角度明确了发电报价网损修正研究的必要性。指出发电报价网损修正问题的实质是输电损耗分摊问题。结合东北区域电力市场运营规则以及实用化算法的基本要求，对采用潮流摄动法和潮流追踪法的两种发电报价网损修正算法从网损修正系数、发电报价修正力度、网损优化方向及网损费用收支平衡四个角度进行了比较研究，指出了潮流摄动法存在的问题，明确了用潮流追踪法进行东北区域电力市场全电量竞价的发电报价网损修正是适宜的。以东北区域电力市场为例，经计算分析验证了本所提观点。     

热塑性木塑复合材料性能研究概况

木塑复合材料(WPC)是一种兼有木材和塑料优点的新型材料。本文阐述了国内外WPC的研究现状，重点介绍通过表面改性以及WPC中相容剂、偶联剂的应用，改善WPC的界面相容性与加工性能，以及一些新的研究手段。认为环保型WPC材料的研究应用会大有前途。     

Casting structure of pure aluminum by electric pulse modification at different superheated temperatures

Electric pulse modification （EPM） is a novel technique that reduces grain size by altering the structure of a melt. It was investigated that the response of the casting structure of high pure aluminum to EPM in different superheated melts. The results indicate that the grain refining effect of a given pulse electric field holds an optimal temperature range, moreover, a lower or higher superheated temperature will both disadvantage the improvements of casting structure. It essentially lies in the cooperative action between the distorted absorption of clusters and the activated capability of atoms in the aluminum melt.     

Fabrication, in vitro Degradation and Cytotoxic Assay of Different Crystalline Phases Calcium Polyphosphate

Fabrication, in vitro degradation and cytotoxic assay of different crystalline phases calcium polyphosphate（CPP） were reported. The CPP ceramics were fabricated by crystallizing the amorptous frits, and sintered at 550℃ ,875℃, 1000℃ for 1 h to obtain the 7-CPP, β-CPP and α-CPP respectively. The efffects of the different crystalline phases on their weight loss and released PO4^3- were investigated during the degradation. And the surface change was observed by the SEM, The osteoblastic ROS17/2.8 cell line was used to estimate the cytotoxicity of CPP. The effects of CPP on cells ＇ proliferation were evaluated by using MTT assay. The experimental restdts showed that γ-CPP, β-CPP and α-CPP did not exert cytotoxic effect on the cells. In addition, the proliferation of the growth of ROS17/2.8 cells on β-CPP was optimal.     

Preparation and Luminescent Properties of Eu^3＋ Doped Calcium Phosphate Nanocrystalline

The nanocrystalline Eu^3＋ doped calcium phosphate was prepared by calcining precursors, which were got by precipitation method combined with ultrasound treatment and some polysaccharide. The existence of Eu^3＋ inhibited the reaction of Na^＋ ion and SO4^2- radical with apatite and resulted in the transformation of HAP to β- TCP by replacing the calcium ions. The strongest excitation peak was at 393 nm, and other lower peaks were at 361 nm, 375 nm, 381 nm, 418nm. The strongest emission spectrum appeared at about 618nm. The emission peak （579 nm） showed that Eu^3＋ ions distributed on Ca^2＋ sites of the apatitic structure.     

Fabrication, in vitro Degradation and Cytotoxic Assay of Different Cystalline Phases Calcium Polyphosphate

1Introduction Mostofthematerialsusedhistoricallyarecalcium phosphatessuchashydroxyapatite(HA),tricalciumphosphates(TCP),tetracalciumphosphate(TTCP),and cominationofthevariousphasesofcalciumphosphates[1].Calciumphosphatematerialshavesomeoutstandingprop ert…