Artistic Surface Rendering Using Layout of Text

An artistic rendering method of free-form surfaces with the aid of half-toned text that is laid-out on the given surface is presented. The layout of the text is computed using symbolic composition of the free-form parametric surface  S(u, v)  with cubic or linear Bézier curve segments  C(t) = {c_u (t), c_v (t)}  , comprising the outline of the text symbols. Once the layout is constructed on the surface, a shading process is applied to the text, affecting the width of the symbols as well as their color, according to some shader function. The shader function depends on the surface orientation and the view direction as well as the color and the direction or position of the light source.     

稀土树脂相分光光度法研究

在HCl—KCl(pH0.5)介质中,稀土—三溴偶氮胂二元络合物能较好地被阴离子交换树脂吸附。RE_2O_8在0～8μg/25ml范围内符合比尔定律,以双波长等吸收点法(测量波长λ_1=650nm,参比波长λ_2=740nm)扣除树脂背景影响,应用于稀土矿中稀土总量测定,结果令人满意。     

稀土在搪瓷面釉上应用的研究

采用稀土氧化物和无机化合物的复合物（不简称ＲＩ－复合物）作为搪瓷釉浆悬浮剂，使之全部或大部分代替粘土，进行了一系列试验，已获得成功，突破了长期来搪瓷工业离不开粘土的传统工艺，并实现了工业化生产。     

Morphology and Forming Mechanism of Rare Earth Inclusions During Solidification of Steel

ＭｏｒｐｈｏｌｏｇｙａｎｄＦｏｒｍｉｎｇＭｅｃｈａｎｉｓｍｏｆＲａｒｅＥａｒｔｈＩｎｃｌｕｓｉｏｎｓＤｕｒｉｎｇＳｏｌｉｄｉｆｉｃａｔｉｏｎｏｆＳｔｅｅｌ￥ＺｈａｉＱｉ－Ｊｉｅ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｔａｌｌｕｒｇｙ，ＵｎｉｖｅｒｓｉｔｙｏｆＳ...     

浅谈连城锰矿4号矿段排土场的安全管理实践

针对连城锰矿4号矿段排土场的特点、影响稳定因素及可能产生的危害，在实践中采取了有效的管理措施，防止了排土场危害的产生，保证了排土场的稳定。     

土质边坡稳定分析中条分法与有限元法的比较

对比分析了土质边坡稳定性计算中条分法和有限元法的特点，讨论了在有限元法中边坡稳定系数的计算方法，并针对铜钟水电站库区左岸滑坡分别采用条分法和有限元法研究其稳定性，计算结果表明两种计算方法得到的滑坡稳定系数规律相同，但条分法计算值一般大于有限元值，反映出条分法中部分基本假设与实际情况存在一定差异。     

Studies on the structural and ionic transport properties at elevated temperatures of La1−xMnO3±δ synthesized by a wet chemical method

Structural transformation and ionic transport properties are investigated on wet-chemically synthesized La_1−xMnO₃ (x=0.0–0.18) compositions. Powders annealed in oxygen/air at 1000–1080 K exhibit cubic symmetry and transform to rhombohedral on annealing at 1173–1573 K in air/oxygen. Annealing above 1773 K in air or in argon/helium at 1473 K stabilized distorted rhombohedral or orthorhombic symmetry. Structural transformations are confirmed from XRD and TEM studies. The total conductivity of sintered disks, measured by four-probe technique, ranges from 5 S cm⁻¹ at 298 K to 105 S cm⁻¹ at 1273 K. The ionic conductivity measured by blocking electrode technique ranges from 1.0×10⁻⁶ S cm⁻¹ at 700 K to 2.0×10⁻³ S cm⁻¹ at 1273 K. The ionic transference number of these compositions ranges from 3.0×10⁻⁵ to 5.0×10⁻⁵ at 1273 K. The activation energy deduced from experimental data for ionic conduction and ionic migration is 1.03–1.10 and 0.80–1.00 eV, respectively. The activation energy of formation, association and migration of vacancies ranges from 1.07 to 1.44 eV.     

高温稀土永磁Sm2(Co,Cu,Fe,Zr)17 的制备和性能

制备了高温稀土永磁材料Sm(Coba1Fe0．26Cu0．05Zr0．026)7．0，研究了磁性能与工艺条件的关系．结果表明：提高烧结温度可使材料的Br和(BH)max增大，但是使Hci降低；适当提高真空预烧温度，可使材料在较低烧结温度下致密化，具有较高的Hci和(BH)max和温度稳定性．真空预烧温度过高使性能的急剧降低，其主要原因是Sm的析出．在最佳工艺条件下材料的磁性能参数分别为：Br1．08T3Hci2286kA／m，Hcb932kA／m，(BH)max220．8kJ／m^3；β20-200℃为-0．19％／℃．     

稀土溶液标准物质的研制

选择7种稀土元素:La、Ce、Sm、Eu、Yb、Lu、Y为研究对象,采用高纯稀土氧化物(≥99 99%)为原料,经ICP MS及ICP AES对纯度进行分析后,分别制备成浓度为1000μg mL的稀土溶液标准物质。采用准确、可靠并能溯源的EDTA络合滴定法进行量值核对、均匀性及稳定性检验。对标准物质的不确定度进行了全面的评定。研制的稀土溶液一级标准物质,总不确定度优于0 6%,稳定性达两年以上。     

Monoalkyl Esters of Isoalkylphosphonic Acid as Extractants in Rare Earth Separation

Four monoalkyl esters of isoalkylphosphonic acids have been studied for the chromatographic separation ofrare earths (RE).The relationship between distribution ratios and acid concentration of the eluants forsamarium and ytterbium has been explored.The characteristics of these extractants loaded onto macroreticularpoly (methyl methacrylate) resin beads for the separation of lanthanum,cerium,praseodymium and neodymiumhave been compared.Among the extractants studied,mono(1-methylheptyl) ester of isooctylphosphonic acidwas found to be the best for RE separation.The acidity for separation is lower than any known P-containingextractants for the same purpose.For instance,with 1.73 mol·L~(-1) nitric acid as eluent,thulium,ytterbium andlutetium can be separated quantitatively.The extractant-loaded resins possess high column efficiency with goodkinetic characteristics.The extraction mechanism was also explored.