注水开发油田注水通道状态辨识及预测方法

为研究注水开发油田注水通道的状态,通过将油田动、静态数据分析与机器学习算法相结合,提出了一种基于油田勘探开发动、静态数据进行注水井地层吸水状态预测的新方法.首先利用高斯混合模型完成地层吸水状态分类;然后结合动、静态数据生成机器学习样本,采用随机森林算法构建地层吸水状态预测模型,并对影响地层吸水状态的地质因素和开发因素进...     

2%CrMoNiWV高低压复合转子材料的研究

试验研究了2%CrMoNiWV高低压复合转子材料。试验件在950℃奥氏体化,高压区模拟直径1350mm,模拟喷雾冷速为2.5℃/min,回火温度为660～690℃;低压区模拟直径2500mm,模拟喷水冷速为3℃/min,回火温度为630～660℃。结果表明,综合力学性能达到了目标要求。     

数控研配液压机上梁有限元计算

研配液压机的上梁为箱式梁,其受力分析采用材料力学计算,精度非常低,局部应力和应力集中处都不能表现,在主要结构完成后,需要采用有限元进行应力和变形分析.本文采用有限元法计算研配液压机的上梁,结果表明该方法有助于上梁的结构计算.     

从统一通信看IMS的发展

本文分析了统一通信的市场前景和主要的业务特征,并通过分析比较建议采用IMS作为统一通信的网络控制方式,同时给出采用IMS的统一通信网络部署方案.     

对角延时起爆技术在城市拆除爆破中的应用

对角延时起爆技术是露天深孔爆破中常用的起爆手段,目的是加大孔距减小最小抵抗线并改变岩石运动的方向。在城市拆除爆破中采用对角延时起爆技术少有先例,尤其在大面积城市拆除爆破中。本文介绍的是在沈阳东北汽配城46700m~2框架结构楼房一次爆破拆除工程中,对角延时起爆技术的成功应用。     

Sensing Matrix Optimization for Multi-Target Localization Using Compressed Sensing in Wireless Sensor Network

In the multi-target localization based on Compressed Sensing(CS), the sensing matrix’s characteristic is significant to the localization accuracy.To improve the CS-based localization approach’s performance, we propose a sensing matrix optimization method in this paper, which considers the optimization under the guidance of the t%-averaged mutual coherence. First, we study sensing matrix optimization and model it as a constrained combinatorial optimization problem. Second, the t%-averaged mutual ...     

密闭机柜磁场屏蔽效能研究

本文介绍机柜的电磁屏蔽原理和影响屏蔽效能的因素,对某舰载密闭铸铝机柜的低频磁场屏蔽效能进行了测试,得出具有工程实用价值的数据,对同类机箱机柜的屏蔽效能有参考评估作用,并针对本机柜门、结构和材料对屏蔽效能的影响给出了详细分析。     

Characterization,Expression Profiling,and Biochemical Analyses of the Cinnamoyl-CoA Reductase Gene Family for Lignin Synthesis in Alfalfa Plants

Cinnamoyl-CoA reductase (CCR) is a pivotal enzyme in plant lignin synthesis, which has a role in plant secondary cell wall development and environmental stress defense. Alfalfa is a predominant legume forage with excellent quality, but the lignin content negatively affects fodder digestibility. Currently, there is limited information on CCR characteristics, gene expression, and its role in lignin metabolism in alfalfa. In this study, we identified 30 members in the CCR gene family of Medicago sativa. In addition, gene structure, conserved motif, and evolution analysis suggested MsCCR1–7 presumably functioned as CCR, while the 23 MsCCR-likes fell into three categories. The expression patterns of MsCCRs/MsCCR-likes suggested their role in plant development, response to environmental stresses, and phytohormone treatment. These results were consistent with the cis-elements in their promoters. Histochemical staining showed that lignin accumulation gradually deepened with the development, which was consistent with gene expression results. Furthermore, recombinant MsCCR1 and MsCCR-like1 were purified and the kinetic parameters were tested under four substrates. In addition, three-dimensional structure models of MsCCR1 and MsCCR-like1 proteins showed the difference in the substrate-binding motif H212(X)2K215R263. These results will be useful for further application for legume forage quality modification and biofuels industry engineering in the future.     

Controllable photodynamic performance via an acidic microenvironment based on two-dimensional metal-organic frameworks for photodynamic therapy

Photodynamic therapy(PDT)is a widely-used technology for cancer therapy,but conventional photosensitizers still face some drawbacks,such as hydrophobicity,inadequate pharmacokinetics,low cell/tissue specificity,and uncontrollable photodynamic performance during the therapeutic process.Herein,we present a controllable photodynamic performance based on two-dimensional metal-organic frameworks(2D Zn-TCPP MOF)that displayed a week PDT effect under a neutral environment upon exposure to a 660 nm laser due to the degeneracy of Q bands of TCPP.However,the 2D Zn-TCPP MOF showed a significantly enhanced PDT effect in an acidic environment under irradiation with a 660 nm laser due to the released TCPP from decomposed MOF structure.From the in vitro outcomes,the 2D Zn-TCPP MOF showed controllable photodynamic performance from neutral to acidic environments.Due to the acidic tumor microenvironment,the 2D Zn-TCPP MOF presented the strongest antitumor effect in vivo under irradiation with a 660 nm laser.This work offers a promising strategy to develop a next-generation photosensitizer.