小塔子沟金矿床1号脉流体包裹体特征研究

小塔子沟金矿床属于典型的含金石英脉型矿床,其中1号脉是该矿区具代表性的矿脉之一。对小塔子沟金矿床1号脉矿石中的流体包裹体进行了岩相学、显微测温及单个包裹体成分激光拉曼光谱研究。结果表明：矿石中发育CO2包裹体、含CO2三相包裹体和水溶液包裹体等3种类型;成矿过程中,流体经历了NaCl-H2O-CO2体系的不混溶作用;各类包裹体均一温度260～400℃,含CO2包裹体盐度为0.21%～2.42%（NaCl）,气液二相包裹体盐度为5.26%～8.14%（NaCl）,成矿压力68～108 MPa,成矿深度6.67～8.61 km。综合分析认为小塔子沟金矿床为中温深成热液金矿床。     

驼峰筛板萃取塔的性能研究及应用

驼峰筛板填料（HS-I型）塔是一种兼有筛板和填料功能的新型萃取塔。在直径0.1m,高度2.0m的HS-I型萃取塔中,用低界面张力体系正丁醇-丁二酸-水研究分散相存留分数、液泛速度等流体力学性能和理论板高度等传质性能。实验结果表明,新型塔内构件兼有塔板和填料的优点,塔的通量大,传质效率高。由实验结果得到的液泛速度等关联式可用于该塔型的工程放大设计中。该塔型已在石油化工的液化气脱硫中得到工业应用。     

SURFACE COMPOSITE GEAR AND PIPE MADE BY SEPARATED EUTECTIC TECHNOLOGY

1.IntroductionTheeutecticgroWthisoftenconsideredtobesimilartothatofpuremetals,becauseittakesp1aceathatemperatureneartheequilibriumtemperature.Thusthereisnoin-trinsicreasonforoccurrenceofmacroscopicsegregationofconstituentelements.However,itisrecentlyfoundthatsomeeutecticscouldbeseparatedonmacroscopicscalewhiletheothersareimpossibleI1'2].Inordertosearchouttheformativemechanismoftheseparatedeutecticphenomenon,about26kindsofbinaryeutecticsareusedtoinvestigatewhetherornottheseparatedeutecticiscon…     

Microwave-assisted synthesis of graphene-supported Pd1Pt3 nanostructures and their electrocatalytic activity for methanol oxidation

This work reports the development of a facile, one-step microwave heating method for the synthesis of graphene-supported Pd₁Pt₃ (Pd core/Pt shell) electrocatalysts. The structure and composition of the synthesized nanocomposites were characterized via transmission electron microscopy and atomic force microscopy as well as energy-dispersive X-ray, X-ray powder diffraction, FTIR, and Raman spectroscopies. Using voltammetry, the electrocatalytic characteristics of the graphene-supported Pd₁Pt₃ nanostructures were evaluated for the oxidation of methanol as a model reaction. The results show that the introduction of graphene increases the electrochemically active surface area of the Pd₁Pt₃ nanostructures. As compared to the unsupported Pd₁Pt₃ electrocatalyst, the graphene-supported Pd₁Pt₃ electrocatalyst exhibited 80% enhancement of the electrocatalytic specific mass current for the oxidation of methanol. This method may serve as a general, facile approach for the synthesis of graphene-supported bimetallic PtM electrocatalysts with increased utilization of the Pt metal, which is expected to have promising applications in fuel cells.     

Synthesis and characterization of superhydrophobic wood surfaces

Superhydrophobic films were developed on wood substrates with a wet chemical approach. Growth of zinc oxide (ZnO) nanorods was found differentially in the cross‐sectional walls and inner lumenal surfaces. The surface roughness of the prepared films on the inner lumenal surface conformed to the Cassie–Baxter wetting model, whereas the roughness across the microsurface of the cell wall was in conformity with the hydrophobic porous wetting model. The space between the ZnO nanorods and the microstructure of the wood surface constituted the nanoscale and microscale roughness of the ZnO nanofilm, respectively. The water contact angle of the prepared wood surfaces was up to 153.5°. In the prepared films, monolayers of stearic acid molecules were self‐assembled on the ZnO nanorods, which in turn, were attached to the wood surface via dimeric bonds. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

气-液-固三相流化床冷态实验

以氮气为气相、蒸馏水为液相、铜粉为固相构建了的气-液-固三相流化床冷态实验装置,流化床反应器内径为50 mm、高为500 mm.采用Hilbert-Huang Transform分析了布风板上表面处压力脉动信号,考察了布风板压差和床内两固定测点间压差随气体流速的变化关系,使用降速法得到了气-液-固三相流化床的最小流化速度,并通过同步图像采集验证了该最小流化速度.结果表明:气体流速为14.85 mm/s时,固体颗粒之间碰撞剧烈,气、液、固三相混合均匀;随着气体流速的增加,两固定测点间压降呈现先降低,后增加,最后又降低的变化趋势;气-液-固三相流化床的最小流化速度约为17.4 mm/s.     

有强迫项和分段常自变元微分方程具有非振动解的充分条件

本文研究了微分方程y~1(t)-a(t)y(t)-p(t)y([t])=h(t) t≥0 (1)用不动点方法给出了(1)具有非振动解的一个充分条件,其中[t]是最大取整函数。     

Intelligent decoupling PID control for the forced-circulation evaporation system

The control objective of the forced-circulation evaporation process of alumina production is not only to avoid large fluctuations of the level, but also to ensure the product density to track its setpoint quickly. Due to the existence of strong coupling between the level loop and the product density loop, and high nonlinearities in the process, the conventional control strategy cannot achieve satisfactory control performance, and thus the production demand cannot bemet. In this paper, an intelligent decoupling PID controller including conventional PID controllers, a decoupling compensator and a neural feedforward compensator is proposed. The parameters of such controller are determined by generalized predictive control law. Real-time experiment results show that the proposed method can decouple the loops effectively and thus improve the evaporation efficiency.     

热分析技术应用综述

综述了近年来热分析技术在工业方面、食品分析、药品分析等领域的应用情况。     

Polytetrafluoroethylene-intercalated MXene membranes with good photothermal performance for enhanced laser ignition

Photothermal effect has been widely used in many areas such as cancer therapy, photothermal energy harvesting, and laser ignition. However, exploring reliable and efficient free-standing energy converter for enhancing the photothermal performance is still a challenge. Herein, free-standing membrane based on two-dimensional MXene (Ti₃C₂) nanosheets and polytetrafluoroethylene (PTFE) was fabricated and characterized by X-ray diffraction, scanning electron microscopy and differential scanning calorimetry, which demonstrated a drastic temperature rise by laser irradiation and was further used as energy converter for enhancing the photothermal performance of laser ignition. Furthermore, the initiating power of the laser initiator can be largely reduced by adding a thin layer of MXene/PTFE membrane above the B/KNO₃ cylinder. This work can give great promise for MXene-based membranes as the laser energy converter for reducing the initiating energy and promote the development of laser initiators with low initiating energy.