实施强化预脱硅及间接加热脱硅新技术

脱硅是生产氧化铝的重要工序。通过对脱硅机理的分析和预脱硅条件的实验室研究,合适的预脱硅条件为温度95~100℃、晶种添加量50~80g/L、搅拌反应时间3~4h;工业应用后,提高了预脱硅效率,达到80%以上,减缓了套管加热器结疤生成速度,使间接加热脱硅机运行周期由原来的10天左右延长到3个月以上,提高了溶液浓度,使吨氧化铝蒸汽消耗降低了0.32t。     

Comprehensive Transcriptome Analysis of Hair Follicle Morphogenesis Reveals That lncRNA-H19 Promotes Dermal Papilla Cell Proliferation through the Chi-miR-214-3p/β-Catenin Axis in Cashmere Goats

Cashmere is initiated and develops in the fetal stages and the number and density of secondary hair follicles (SHFs) determine cashmere production and quality. Growing evidence indicates that both microRNA (miRNA) and long non-coding RNA (lncRNA) play an indispensable role in hair follicle (HF) growth and development. However, little is known about miRNAs, lncRNAs, and their functions as well as their interactions during cashmere initiation and development. Here, based on lncRNA and miRNA high-throughput sequencing and bioinformatics analysis, we identified 10,485 lncRNAs, 40,639 mRNAs, and 605 miRNAs in cashmere goat skin during HF induction, organogenesis, and cytodifferentiation stages. Among them, 521 lncRNAs, 5976 genes, and 204 miRNAs were differentially expressed (DE). KEGG analysis of DE genes indicated that ECM–receptor interaction and biosynthesis of amino acids were crucial for HF development. Notch, TGF-beta, and Wnt signaling pathways were also identified, which are conventional pathways associated with HF growth and development. Then, the ceRNA regulatory network was constructed, and the impact of lncRNA H19 was investigated in dermal papilla (DP) cells. The MTT, CCK-8, and EdU assays showed that the viability and proliferation of DP cells were promoted by H19, and mechanistic studies suggested that H19 performed its function through the chi-miR-214-3p/β-catenin axis. The present study created a resource for lncRNA, miRNA, and mRNA studies in cashmere morphogenesis. It could contribute to a better understanding of the molecular mechanism of ncRNAs involved in the regulation of HF growth and development.     

濮城油田沙三中6-10油藏活性纳米粉体降压增注技术研究

濮城油田沙三中6-10油藏为低渗油藏,因注入水质差,造成对地层的伤害,注水压力不断上升。通过分析造成地层伤害的主要因素,为控制注水压力的上升,提出了活性纳米降压增注技术,并在室内进行了研究,从活性材料选择、表面修饰剂选择、分散介质选择以及纳米粉体水分散最佳浓度进行了室内筛选,指出了纳米酸化技术的可行性。在室内研究的基础上,在现场开展了10口井活性纳米技术的应用,取得了良好的效果。     

电子束蒸镀金膜表面黑色颗粒形成的机理研究

采用电子束蒸镀金膜时, 会有微小的黑色颗粒出现在金膜的表面, 这些黑色的颗粒形状大多不规则, 尺寸集中在100 nm~-1μm之间, 传统的蒸镀理论较难解释这些黑色颗粒的成因。本文尝试提出液态金属表面热发射电子引起液面上杂质颗粒“尖端放电”的理论来解释这一现象。这类电晕放电造成颗粒附近温度极高, 瞬间将颗粒蒸发沉积在衬底。通过改变蒸镀功率, 或保持功率不变, 改变电子束斑点形状、落点位置等一系列实验, 验证了理论的合理性。     

AlGaN solar-blind APD with low breakdown voltage

A p-i-i-n type AlGaN heterostructure avalanche photodiodes (APDs) is proposed to decrease the avalanche breakdown voltage and to realize higher gain by using high-Al-content AlGaN layer as multiplication layer and low-Al-content AlGaN layer as absorption layer. The calculated results show that the designed APD can significantly reduce the breakdown voltage by almost 30%, and about sevenfold increase of maximum gain compared to the conventional AlGaN APD. The noise in designed APD is also less than that in conventional APD due to its low dark current at the breakdown voltage point. Moreover, the one-dimensional (1D) dual-periodic photonic crystal (PC) with anti-reflection coating filter is designed to achieve the solar-blind characteristic and cutoff wavelength of 282 nm is obtained.     

“神光-Ⅲ”主机装置的自适应光学波前校正系统

本文介绍了为“神光-Ⅲ”主机装置研制的五十套工程化自适应光学系统,包括系统技术方案,基于可拆卸技术的大口径变形镜和具有自动对准功能的哈特曼波前传感器两主要部件的性能,测量并分析了波前特性,系统校正结果表明：自适应光学系统改善了主机装置的光束质量,满足10倍衍射极限范围内激光能量大于95%的指标要求,确保“神光-Ⅲ”主机装置激光在主放大系统内的传输顺畅。

     

负偏压功率对溅射沉积钛、铜薄膜电阻的影响

为了研究负偏压功率对直流溅射沉积铜、钛两种金属薄膜电阻率的影响,在采用相同的工艺条件溅射沉积两种金属薄膜的同时分别加上0、50、150 W的负偏压功率,发现随着偏压功率由0增加到150 W,制备的钛薄膜厚度下降了25%,电阻率下降到原来的18%,而对于铜薄膜随着偏压功率由0增加150 W,厚度下降了5%,电阻率却增加到原来的4倍。用原子力显微镜和X射线衍射仪器分析了不同负偏压功率下制备的两种金属薄膜的表面粗糙度和两种金属薄膜的结晶情况,并用Fuchs-Sondheimer理论和Mayadas-Shatzkes理论解释偏压功率引起两种金属电阻变化的原因。这为教学实验、真空镀膜工艺和集成电路生产领域沉积不同结构及电阻的金属薄膜提供参考。     

2205双相不锈钢摩擦焊接头显微组织及微区蠕变性能

对2205不锈钢进行连续驱动摩擦焊接,通过光学显微镜观察接头显微组织,利用纳米压痕仪对接头组织中铁素体(δ相)和奥氏体(γ相)进行硬度测试及压痕蠕变行为分析。结果表明,摩擦焊接头由塑性变形区及焊合区构成,变形区内γ相与δ相相比,因塑性流动而硬化的现象更为显著,且具有更高的纳米硬度和弹性模量;基于保载过程中应变率和硬度对数关系,经线性拟合得到蠕变应力指数n,能够较好地反映δ相和γ相的蠕变特性,而且纳米硬度值越高,蠕变应力指数越小。     

VOD冶炼超纯铁素体不锈钢脱碳脱氮

要利用VOD冶炼超纯铁素体不锈钢脱碳脱氮模型,研究了在吹氧脱碳阶段氧气利用率以及脱氮能力与初始碳含量的关系,分析了自由脱碳阶段的VOD脱碳和脱氮能力,并讨论了停氧后碳含量对脱碳以及温度控制的影响.研究结果为VOD冶炼超纯铁素体不锈钢合理脱碳脱氮提供技术指导.     

A simple analytical model to predict liquid unloading in the horizontal gas well

An accurate prediction of the critical gas velocity for the liquid loading is of great importance for operators to select the tubing diameter for the newly dril...