Monolayer MoS2 Dendrites on a Symmetry‐Disparate SrTiO3 (001) Substrate: Formation Mechanism and Interface Interaction

Dendritic patterns generated in non‐equilibrium growth processes are prevalent in nature while their formation mechanisms are far from fully understood. Here, we report a coverage‐dependent fractal degree evolution of monolayer 2H‐MoS₂ dendrites synthesized on a symmetry‐disparate substrate of SrTiO₃ (001). Surprisingly, various characterizations have revealed that the monolayer dendrites featured with orthogonal backbones are single crystalline, possessing both peculiar adlayer‐substrate interaction and abnormal indirect bandgap on SrTiO₃ (001). Further theoretical calculations indicate that a prominent diffusion anisotropy of monomer precursors, combined with the disparate adlayer‐substrate symmetry, determine the diffusion‐limited aggregation of MoS₂ towards dendritic shapes. This work provides brand‐new insights in the morphological engineering of two‐dimensional atomic crystals, and contributes greatly to an in‐depth understanding of the detailed dynamics in non‐equilibrium crystal growth.     

A novel building block for donor-acceptor conjugated polymers containing perylene, poly(p-phenylenevinylene), and fullerene

A series of new polymers containing perylene, poly(p-phenylenevinylene) (PPV) and/or pendant fullerene units have been synthesized by Wittig condensation. All of the polymers were characterized by 1HNMR, FT-IR, and GPC. The optical properties of the polymers were studied by UV-vis and FL spectra. The cyclic voltammetry showed us a good candidate for a photoinduced electron-transfer system. And the photocurrent measurement revealed an interesting phenomenon that the photocurrent increased with the contents of the fullerene in the polymers increased.     

改善肉仔鸡胴体结构 提高胸腿肌量的研究

本研究采用通径分析的方法,对影响胸腿肌量(瘦肉量)的九个性状作了研究.结果表明,净膛重对胸腿肌量的影响较大,对改善胴体结构或对胴体进行加工时,也是一个重要指标,用其来评测胸腿肌量最为适宜.同时也明确指出了其它性状对胸腿肌量的影响,为改善胴体结构提供了可靠的依据.本研究同时还对胸腿肌中胆固醇和脂肪酸的含量进行了测定.     

The effect of annealing temperature on the structure of diamond-like carbon films by electrodeposition technique

Diamond-like films have been prepared by electrodeposition in liquid phase. The films consist of a little amount of hydrogen, which can be removed by annealing at below 600 °C. The Raman signal of annealing films suggested: (1) the intensity ratio I_D/I_G increases which suggested that the crystallites grew in number and size with increasing temperature; (2) the D-line position changes from 1380 to 1346 cm^–1, and the G-line position from 1580 to 1604 cm^–1 which indicated that partially tetrahedral bonds have been broken and have transformed to trigonal bonds, (3) the linewidths of the D and G-line decrease with the increasing annealing temperature. These results indicated that the primary bonding in the films changed gradually from sp³-bonded to sp²-bonded carbon with increasing annealing temperature, i.e., graphitization.     

新型微束等离子弧焊接电源的研制

鉴于高频电弧具有较强的自收缩作用及较好的电弧稳定性的特点 ,研制了调制型脉冲微束等离子弧电源 .本电源可通过对高频电流的低频脉冲调制调节电弧对焊缝的热输入 ,同时具有电弧能量密度大、主弧空载电压低及起始电流递增和熄弧电流递减等功能 ,适用于铜、钛、不锈钢等金属薄件、微细件的焊接 .     

钢与不锈钢的相变超塑扩散连接

通过利用真空扩散焊设备 ,成功地进行了钢与不锈钢相变超塑扩散连接 .试验结果表明 :在一定的试验范围内 ,扩散连接接头的拉伸强度值随着循环次数N的增加而增大 ,随着加热 /冷却速度的增加而降低 .相变超塑扩散连接最佳状态参数为 :t =70 0～ 92 0℃ ,N =1 0 ,p =1 0～ 2 0MPa.     

无CFC制冷管道洗净剂的研制与应用

１概述制冷系统作为冰箱的核心部分,无ＣＦＣ制冷管内壁清洁度直接决定着无ＣＦＣ冰箱的内在质量。在国内冰箱替代初期,无ＣＦＣ冰箱的质量问题绝大部分是由于制冷管内壁洁净度不高所致,这是因为Ｒ１３４ａ与矿物油相溶性较Ｒ１２差,制冷管道内矿物油、石蜡等的存在对...     

手工涂覆固体减摩涂层的研究

采用ＭｏＳ２粉末和工业石墨粉为减摩剂,ＳＭ－３型金属粘结剂,聚乙烯醇、水玻璃等为粘结剂,用手工涂覆的方法制得了固体减摩涂层,且以ＳＭ－３型金属粘结剂的减摩效果最佳。由于此减摩涂层的工艺简单,成本低廉,因此具有良好的应用前景。     

具有双层效果的提花-印花-剪花织物的设计

为给多重效果组合的织物提供创新设计思路,针对提花-印花织物效果单一,且现有的提花-印花织物设计方法无法适用于剪花、烂花等特殊工艺面料设计的问题,将双层效果提花织物、提花-印花织物与剪花织物的设计方法相结合,提出具有双层效果的提花-印花-剪花织物的设计原理和方法。将目标织物分为提花层、印花层和剪花层3个部分,从图案色彩和组织结构2个方面进行设计分析,提出可行性技术方案。研究结果表明:在提花-印花的基础上,可实现具有双层效果的提花-印花-剪花结合织物的设计,并可构建起提花-印花-剪花织物的设计体系,使织物集双层、织花、印花和剪花4种效果于一体,在织物表面呈现4种静态、3种动态的丰富组合效果。