A generalized Norde plot for reverse biased Schottky contacts

When a metal makes intimate contact with a semiconductor material, a Schottky barrier may be created. The Schottky contact has many important applications in the integrated circuit (IC) electronics field. The parameters of such contacts can be determined from their current-voltage (I-V) characteristics. The literature contains many proposals for extracting the contact parameters using graphical methods. However, such methods are generally applicable only to contacts with a forward bias, whereas many Schottky contacts actually operate under a reverse bias. Accordingly, the present study proposed a generalized reverse current-voltage (I-V) plot which enables the series resistance, barrier height, and ideality factor of a reverse biased Schottky contact to be extracted from a single set of I-V measurements. A theoretical derivation of the proposed approach was presented and a series of validation tests were then performed. The results show that the proposed method is capable of extracting reliable estimates of the contact parameters even in the presence of experimental noise.     

多功能超声成像测井仪设计

基于超声脉冲反射法测量原理,设计了一种多功能超声成像测井仪器,并介绍了该仪器测量的具体实现方
法。该仪器在裸眼井中采用成像测量模式可完成井眼内壁高分辨率成像测量;在套管井采用全波测量模式可同时完
成套损检测及水泥胶结质量评价测量。应用该仪器在实际裸眼井及套管井进行了测试,实测资料表明其在裸眼井中
可对井壁进行裂缝、孔洞、层理等地质构造分析;在套管井中可进行套管厚度成像、套管内外径成像及水泥声阻抗成像
等评价。该仪器可对套管腐蚀及第I 界面水泥胶结质量做定量评价。     

Functional dissection of lysine deacetylases reveals that HDAC1 and p300 regulate AMPK

First identified as histone-modifying proteins, lysine acetyltransferases (KATs) and deacetylases (KDACs) antagonize each other through modification of the side chains of lysine residues in histone proteins. Acetylation of many non-histone proteins involved in chromatin, metabolism or cytoskeleton regulation were further identified in eukaryotic organisms, but the corresponding enzymes and substrate-specific functions of the modifications are unclear. Moreover, mechanisms underlying functional specificity of individual KDACs remain enigmatic, and the substrate spectra of each KDAC lack comprehensive definition. Here we dissect the functional specificity of 12 critical human KDACs using a genome-wide synthetic lethality screen in cultured human cells. The genetic interaction profiles revealed enzyme-substrate relationships between individual KDACs and many important substrates governing a wide array of biological processes including metabolism, development and cell cycle progression. We further confirmed that acetylation and deacetylation of the catalytic subunit of the adenosine monophosphate-activated protein kinase (AMPK), a critical cellular energy-sensing protein kinase complex, is controlled by the opposing catalytic activities of HDAC1 and p300. Deacetylation of AMPK enhances physical interaction with the upstream kinase LKB1, leading to AMPK phosphorylation and activation, and resulting in lipid breakdown in human liver cells. These findings provide new insights into previously underappreciated metabolic regulatory roles of HDAC1 in coordinating nutrient availability and cellular responses upstream of AMPK, and demonstrate the importance of high-throughput genetic interaction profiling to elucidate functional specificity and critical substrates of individual human KDACs potentially valuable for therapeutic applications.     

由含固溶体二元相图提取活度

本文提出了一种由固溶体类型的二元相图提取组元活度的新公工，在该式中各组元的活度系数可以表示为组成的函数，用此公式对Ag-Pb体系进行了计算，证明了该方法是有效的的。     

24阶正交拉丁方的构造方法

提出了一种4t 阶正交拉丁方法的构造方法,阐明了4t 阶正交拉丁方构造的思路,介绍了24阶正交拉丁方构造的基本步骤和构造结果。     

河南省鳞翅目昆虫分科研究

本文系统报导了河南省已知鳞翅目昆虫843种,隶属于50个科,其中蛾类707种、占81.3%,蝶类138种,占18.7%,编制了河南省鳞翅目昆虫分科检索表.     

碳/碳复合材料的渗硅抗氧化复盖层

在碳/碳复合材料上渗硅可得到碳化硅复盖层。对不同渗硅温度和时间下得到的碳化硅层进行破坏性试验。实验指出,有碳化硅复盖层保护下的碳/碳复合材料,其抗氧化性能提高约2个数量级。     

江苏省工业企业科技-能源-经济协调发展系统动态研究

本文运用系统动力学原理构造了江苏省工业企业科技-能源-经济协调发展的系统动态模型,并对模型的参数进行了确定,最后利用模型进行了预测和仿真.计算结果表明,江苏省工业企业今后必须适当压缩固定资产投资规模,增加科技投入,特别是节能和能源综合利用类的以及提高劳动生产率的科技投入,以促进江苏省企业经济发展从粗放型向集约化型,从资金密集型向技术密集型,从速度型向效益型的重大发展战略转移.     

可控氧流冶金

总结可控氧流冶金的原理、特点、方法,介绍可控氧流冶金在金属熔体的无污染脱氧以及从溶解于离子熔体中的氧化物提取有价金属方面的研究状况,认为可控氧流冶金有利于创建全新的绿色冶金新技术。     

蓝黑墨水字迹的DSC特征

为探讨将DSC测定蓝黑墨水字迹的书写时间技术用于司法鉴定,使用差示扫描量热仪(DSC)测试了不同书写时间的蓝黑墨水字迹,其DSC特征峰为300℃左右的放热峰.特征峰出现的条件为:等重的字迹和空白纸分别置于2个等重的坩埚;以装有空白纸的坩埚作为参比;实验气氛为静态空气;升温速率10℃/m in;字迹书写后存放时间为2~365×5d.结果表明:同一样品峰温的重现性差,不同书写时间样品的峰温随时间变化无序,因此仅用DSC不能确定蓝黑墨水字迹的书写时间.