Nanoimprint Lithography for Functional Three‐Dimensional Patterns

Nanoimprint lithography (NIL) is viewed as an alternative nanopatterning technique to traditional photolithography, allowing micrometer‐scale and sub‐hundred‐nanometer resolution as well as three‐dimensional structure fabrication. In this Research News article we highlight current activities towards the use of NIL in patterning active or functional materials, and the application of NIL in patterning materials that present both chemistry and structure/topo­graphy in the patterned structures, which provide scaffolds for subsequent manipulation. We discuss and give examples of the various materials and chemistries that have been used to create functional patterns and their implication in various fields as electronic and magnetic devices, optically relevant structures, biologically important surfaces, and 3D particles.     

Nanoimprint Lithography: A Processing Technique for Nanofabrication Advancement

Nano-Micro Letters - Nanoimprint lithography (NIL) is an emerging micro/nano-patterning technique, which is a high-resolution, high-throughput and yet simple fabrication process. According to...     

部件试验模态综合的简便方法

本文将一种基于完备模态基的模态综合技术应用于子结构的试验模态综合,获得成功。这种半试验半理论的模态综合方法是一种较为简便的、要求试验工作量较小的试验模态综合法,因为它只要求测量子结构的振动模态和频率即可。数值仿真结果表明,这种简便的试验模态综合法是行之有效的。     

测试类标准的研制方法（上）

本文论述了测试类标准的特点及其研究的要素内容,讨论了测试类标准名称和内容结构的确定,深入、详细地论述了测试类标准试验原理的选择方法,讨论了试剂及材料、设备仪器、试样及其制备的确定方法,讨论了测试条件对测试的影响,详述了试验程序建立的内容,讨论了试验结果的处理方法,研究了测量不确定度的计算方法,以上内容对测试类标准的研制可提供明确的技术性指导。     

单分散球形纳米二氧化硅的制备新方法

在醇类有机溶剂中,以氨气(氨水)作为催化剂,在表面活性剂作用下,TEOS分解生成单分散、球形、实心、粒度分布窄的高纯纳米二氧化硅粉末.TEM研究表明:醇的种类和TEOS的浓度以及催化剂的用量影响粒子的大小、形状和粒径分布.可以在0.05～2μm范围内调节生成的二氧化硅的粒径.     

Double‐Emulsion Globules as a Tool to Produce 2D Patterned Metal Deposits Using Electro‐Colloidal Lithography

A technique developed to self assemble solid colloidal particles under a sinusoidal electric field (AC field) is adapted to soft W/O/W double‐emulsion globules, and is exploited for surface patterning. Double‐emulsions containing cupric ions are prepared, placed between two planar ITO electrodes and submitted to a transversal AC field which induced their ordering into hexagonal 2D‐arrays. The characteristic spacing is monitored by varying the globule volume fraction. Such self‐assembly is used to fabricate copper‐depleted arrays, using globules as both a metal precursor reservoir/provider and as a mask. The ordered globule monolayer is then submitted to a DC field to induce metal precursor leakage and its reduction onto the electrode. The organized, oily and dielectric globules generate arrays of holes (c.a. 7 μm) into a thin copper deposit (thickness of 12 nm). Holes are shown to be formed below the globules, and their separation (from 10 to 30 μm) can be tuned as deduced from direct observations using optical and atomic force microscopy.     

高技术功能薄膜材料电阻率测试新法及微机测试系统

介绍一种适于测量几何形状无规则的薄形样品电阻率的改进直流四探针法(IFPM),同时提出了带背底样品的测试实验修正原理和方法。采用具有标准IEEE—488接口和24路I/0控制接口的PC/XT微机和智能数字仪表组成测试实施系统,在Solartron35 system上用范德堡法(VDPM)和在本系统上用IFPM法对同一块硅单晶片进行了对比测试,二者偏差为4.3％。采用该法还测试研究了直流电弧等离子体喷射技术在陶瓷基底上制备的1μm厚铜-聚丙炔腈(Cu-PPN)金属有机导电薄膜的电阻率与温度的关系,结果表明Cu-PPN薄膜具有非晶半导体的扩展传导机制。研究表明,IFPM法对目前不能沿用传统技术的高技术薄膜材料电阻率测试是一条有效的途径。     

Methods to Produce Tl(1223) Tapes with Improved Properties

Different methods to prepare superconducting mono- and multifilamentary T1(I223) tapes were developed. High-purity ceramics could be produced by ex-situ or in-situ reaction under a high isostatic gas pressure. Tapes prepared by the PIT method and an in-situ reaction carried out close to the melting point of the oxide were relatively dense and textured. Interesting results were obtained for samples where part of the oxygen atoms in Tl(1223) had been substituted by fluorine. Critical current densities up to 20'000 A/cm² (77 K, 0 T) were reached for tapes produced by the PIT method. Well textured samples were obtained by electrophoretic deposition, the deposited Tl(1223) grains being produced by a synthesis involving substantial melting.     

一种简化的无陀螺惯导系统安装误差校准方法

通常,实现对加速度计安装误差的有效校准方法是“先方向后位置”的“二步法”．为简化校准过程,提出了一种新的校准方法．该方法将加速度计安装方向和位置向量同时校准,分别节省了3次加速度计组合翻转,3次水平台调平．在计算机仿真中,经校准及补偿后的无陀螺惯导系统精度显著提高,仿真结果表明了该方法的有效性．     

高压输电塔-线耦联体系的实用简化抗震计算方法

在现阶段的输电塔线体系抗震设计计算中均不考虑导线对塔的影响,然而大量的研究表明,按照现行<电力设施抗震设施规范>设计的高压输电塔线体系在强震作用下是偏于不安全的.根据5个实际工程,分别建立了高压输电塔线体系的三维有限元模型,并且考虑导线的几何非线性,以模拟两者间振动耦联效应的模型,进而验证输电塔-线耦联体系的简化抗震计算方法.分析结果表明,在纵向振动下,塔线耦联体系有限元模型结果与简化方法计算结果吻合得比较好,最大平均误差在5%以内;在侧向振动下,塔线耦联体系有限元模型结果与简化方法计算结果相差稍大,但最大平均误差也仅约为8%,由于某个输电塔共振引起的,这样的误差在实际工程中是完全可以接受的.最后,这些结果可供编制有关输电塔体系的设计规范提供参考.     

A Simplified Regular Solution Model for Solubility of Nonmetal (2) in Metal(1)-Metal(3) Alloy Systems

A simplifled regular solution model for the solubility of nonmetallic element (2) in metal(1)-metal(3) alloy system has been derived and applied to the Fe-C-j, Ni-C-j and Fe-N-j (j denotes a metal) systems with satisfaction. The exchange energies of concerned systems are evaluated     

一种新的航空发动机叶片疲劳试验方法

在某型航空发动机叶片疲劳试验件数量严重不足的情况下,提出一种新的航空发动机叶片疲劳试验方法-逐级载荷加载法。该方法先以一个相对较低的振动水平对叶片进行激励,然后逐级加大叶片的激励水平,直至叶片出现疲劳破坏,最后获取该叶片的疲劳极限。应用该方法对某型发动机第5级轴流压气叶片进行疲劳试验,有效地获取该叶片的疲劳极限。     

A Simplified Method for Making Accurately Etched Shapes in Molybdenum Foils by a Photo Sensitive Resist Technique

Photo etching is a convenient technique for fabricating small metal components, but normally expensive and complex equipment is needed. This report describes a simplified technique for making evaporation masks in molybdenum foil, using standard laboratory equipment of relatively low cost. When using 0.003 in. molybdenum results accurate to ±0.0005 in. (±3 per cent) have been achieved. Accuracy is dependent on a number of factors, which include the photography, the thickness and type of metal and the etching technique.