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specific area
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  比表面积
     The results showed that Ce0.35Zr0.55La0.10O1.95 had a cubic structure similar to Ce0.50Zr0.50O2 and high specific area after calcined at 600 ℃ for 5 h.
     XRD和BET的结果表明,经600℃焙烧5h后,Ce0.35Zr0.55La0.10O1.95具有与Ce0.50Zr0.50O2相似的立方结构和高的比表面积;
短句来源
     The results show that the diameter and specific area of α-Fe_2O_3 particles are 200 nm and 69.7 m~2/g respectively,and their dispersity is better.
     结果表明,α-Fe2O3粒子的分散性较好,粒径为200 nm,比表面积为69.7 m2/g。
短句来源
     The research results show that the high fluidity((200±20) mm) concrete added 10%~60% by mass of steel slag powder(with specific area 450 m~2/kg) in cementitious has the compressive strength 26.4~(53.4 MPa) at 28 d.
     研究结果表明,掺入质量分数为10%~60%的比表面积为450m2 kg的钢渣微粉,可以配制出坍落度为(200±20)mm,保水性、粘聚性俱佳且28d抗压强度为26.4~53.4MPa的混凝土.
短句来源
     Determination of Specific Area and Mass Transfer Coefficient of Na_2SO_3-air System in A Stirred Vessel
     搅拌鼓泡釜中Na_2SO_3—空气体系的比表面积及传质系数的测定
短句来源
     Results also revealed that for Pt/C-Pt(NH_3)_2(NO_2)_2,the activity enhancement to CO oxidation and O_2 reduction reactions resulted from the increase of specific area of Pt clusters,while to methanol oxidation,was mainly due to high percentage of Pt(110) in the surface.
     而且,Pt/C-Pt(NH3)2(NO2)2对CO氧化和O2还原的高活性主要来自于催化剂比表面积的提高,而对甲醇氧化活性的提高,表面存在更多的(110)晶面也是重要因素.
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  比面积
     Design of a turbocharger compressor stage was formulated as a multiobjective nonlinear mathematical programming problem with the objectives of miniming aerodynamic losses and maximizing specific area (mass flow rate / flow path area of impeller inlet).
     本文将离心增压压气机的设计问题表述为其空气动力学损失极小化,比面积(质量流率/动叶进口面积)最大化的多目标非线性数学规划问题.
短句来源
     The pore size inside the low permeable formations is considered to be very small (diameter in μm), but the ratio of specific area are very large.
     在低渗透地层中,渗流孔道非常小(以μm计),但其比面积却很大。
短句来源
     In this paper,the specific area method is used to express the shear thinning behavior of drilling fluid,which is compared with “evaluation” index.
     文中采用了比面积法来表征钻井液剪切稀释性,并与“评价”指标进行了对比分析。
短句来源
  “specific area”译为未确定词的双语例句
     Research on preparation of α-Fe_2O_3 with large specific area and its catalytic performance
     大比表面积α-Fe_2O_3的制备及其催化性能研究
短句来源
     Since the texture and specific area of γ Al2O3 can be easily adapted and there are various kinds of commercial γ Al2O3 available, MgO/γ Al2O3 is a promising solid base that may be found in use.
     由于γ Al2O3 的织构可以方便地调节 ,且MgO/γ Al2O3很容易制备 ,MgO/γ Al2O3 是一个很有应用前景的固体碱.
短句来源
     TPR study on doped CeO_2 nano powders with a high specific area
     高比表面掺杂CeO_2纳米粉体的TPR研究
短句来源
     α-Fe_2O_3 submicron particles with large specific area were prepared by deposition hydrolysis method,and its structure and shape were characterized by means of SEM,XRD,FTIR and BET.
     用沉淀水解法制备了大比表面积的亚微米α-Fe2O3粒子,并用SEM、XRD、FTIR和BET对其结构和形态进行了表征。
短句来源
     Pr_(0.6-x)Nd_xCa_(0.4)FeO_(3-δ)(x=0.0,0.2,0.3,0.4,0.5,0.6) were synthesized using Pechini method. A number of studies were conducted concerning composition,specific area,crystalline structure and microstructure of the samples by means of FT-IR,BET,XRD TG-DTA and SEM.
     采用Pechini法合成了Pr0.6-xNdxCa0.4FeO3-8(x=0.0,0.2,0.3,0.4,0.5,0.6)系列复合氧化物粉体,用FT-IR,BET,XRD,TG-DTA,SEM等对产物形成过程及微结构进行了表征。
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  specific area
A nano-alumina with high specific area was prepared using a homogeneous precipitation method with titanium dioxide and barium oxide as modifying additives.
      
Results showed that 5 wt% TiO2 or BaO added in the alumina gels can decrease the particle size and increase the specific area, but excessive TiO2 or BaO could deteriorate the properties of α-Al2O3.
      
The influence of contact type between carbon particles and these oxides was examined by thermal analysis, the BET specific area, and EPR spectroscopy.
      
Two types of diamond, with specific area of 5.8 and 170 m2/g, are used.
      
Efficiency of action of variable conductance and specific area of porous matrix on the current distribution is compared in identical conditions with the aid of numerical calculations based on a one-dimensional model for a porous electrode.
      
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The specific area and mass transfer coefficient in a gas-liquid reactor of 30cm diameter stirred by a 6 bladed turbine agitator have been determined for aq. Na_2SO_3-air system. Correlations have been developed for a wide range of opreating conditions and the results thus obtained may be served as in design and scale-up problems.

在直径为300mm的气液反应器中,以六叶园盘涡轮桨为搅拌器,测定了Na_2SO_3——空气系统的比表面积和传质系数。並在宽广的操作范围内,得出了它们的关联式。这些结果,可在设计和放大时作为依据。

This paper describes a new apparatus with definite pressure monitor and of nitrogen adsorption at low temperature. It could be used to measure specific areas in a wide range ( i. e.0. 001-1500m2g-1) with high precision. The paper shown that the deviation of gas from its ideal state below its critical temperature has influence on the results of measurement.

本文介绍由定压指示器指示压力,以低温氮吸附测宽范围的此表面积(即0.001—1500m~2g~(-1))的新仪器,具有高精度。文中说明气体偏离理想态对测定结果的影响。

Minor amounts of Y_2O_3 and Al_2O_3 were used as additives for hot pressing of Si_3N_4 ma-terial. Investigations were conducted to study the effects of processing parameters on den-sification, α→β'phase transformation, as well as on micorstructure and properties. If thematerial preparation α/β ratio of approximately 90/10 and a specific area of about 5 m~2/g,a close to fully dense product can be obtained by hot pressing at 1700℃ for 60 minutes or at1750℃ for 30 minutes. Products with highest density were...

Minor amounts of Y_2O_3 and Al_2O_3 were used as additives for hot pressing of Si_3N_4 ma-terial. Investigations were conducted to study the effects of processing parameters on den-sification, α→β'phase transformation, as well as on micorstructure and properties. If thematerial preparation α/β ratio of approximately 90/10 and a specific area of about 5 m~2/g,a close to fully dense product can be obtained by hot pressing at 1700℃ for 60 minutes or at1750℃ for 30 minutes. Products with highest density were obtained at 1750℃ for 60 minutes.They have a mean grain size of less than 1μm and an average bending strength (3-points)of 850 MN/m~2. Phase transformation apparently lagged behind densification but did notshow any significant influence on strength. Thermal treatment was further tried on these materials to crystallize the grain boun-dary glassy phase.High resolution electron microscopy clearly revealed the appearance and dis-appearance of certain Y, N containing crystalline phases and the crystallization of grainboundary glassy phases. But so far no alumina bearing compound has been identified.Diffe-rential thermal analyses,thermal expansion and thermal conductivity measurements of sam-ples before and after thermal treatment also reflected the crystallization phenomenon ofthe grain boundary glassy phase.This effect brings clear advantages to the high temperaturemechanical properties of these materials.Moreover, the decrease of coefficient of thermalexpansion and the increase of coefficient of thermal conductivity of Si_3N_4 materials afterproper thermal treatment also contribute to the improvement of their anti-thermal shockproperties.

本工作采用少量Y_2O_3和Al_2O_3作为添加剂,研究了热压Si_3N_4材料的工艺因素对致密化、α→β’相变以及显微结构和强度的影响。当氮化硅原料的α/β比为9/1、比表面约为5m~2/g,在1700℃,60min或1750℃,30min即可热压到接近完全致密(显气孔率<1%);在1750℃,保温60min,密度达到最高值,抗折强度为850MN/m~2,晶粒尺寸一般小于1μm。相变显然落后于致密化的进程,但对强度没有明显影响。 本工作还进一步探讨了采用热处理方法,使晶界玻璃态结晶化。高分辨率电子显微镜技术(与英国剑桥大学合作)可以明确地观察到晶界玻璃态转化为结晶态以及微量结晶相的变化。热处理前后试样的热膨胀与导热性能的研究,也反应出这种晶界玻璃相的结晶化现象,它对改善材料的高温强度有明显作用。同时由于材料的高温热膨胀系数减小、导热系数增大,它的抗热震性能必然可以进一步得到改善。

 
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