SiC_w／Al_2O_3－（Ti，W）C复相陶瓷的微观结构及其力学性能EI

本文对Ａｌ_２Ｏ_３（Ｔｉ，Ｗ）Ｃ和ＳｉＣｗ－Ａｌ_２Ｏ_３（Ｔｉ，Ｗ）Ｃ的力学性能进行了分析对比，研究了热压工艺、ＳｉＣ晶须含量、晶须分散效果和晶须／基体的复合情况等对Ａｌ_２Ｏ_３（Ｔｉ，Ｗ）Ｃ复相陶瓷力学性能的影响。从热膨胀系数失配角度分析和微观结构的观察证实，ＳｉＣ晶须及（Ｔｉ，Ｗ）Ｃ固溶体对改善Ａｌ_２Ｏ_３陶瓷力学性能的效果是显著的，ＳｉＣ_ｗ－Ａｌ_２Ｏ_３．（Ｔｉ，Ｗ）Ｃ陶瓷材料的增韧机制主要是裂纹偏转和裂纹桥接。     

SiC_w／Al_2O_3－（Ti，W）C复相陶瓷的微观结构及其力学性能

本文对Ａｌ_２Ｏ_３（Ｔｉ，Ｗ）Ｃ和ＳｉＣｗ－Ａｌ_２Ｏ_３（Ｔｉ，Ｗ）Ｃ的力学性能进行了分析对比，研究了热压工艺、ＳｉＣ晶须含量、晶须分散效果和晶须／基体的复合情况等对Ａｌ_２Ｏ_３（Ｔｉ，Ｗ）Ｃ复相陶瓷力学性能的影响。从热膨胀系数失配角度分析和微观结构的观察证实，ＳｉＣ晶须及（Ｔｉ，Ｗ）Ｃ固溶体对改善Ａｌ_２Ｏ_３陶瓷力学性能的效果是显著的，ＳｉＣ_ｗ－Ａｌ_２Ｏ_３．（Ｔｉ，Ｗ）Ｃ陶瓷材料的增韧机制主要是裂纹偏转和裂纹桥接。     

通过去除PAN－ACF表面H_2SO_4水溶液的办法连续模拟脱除烟道气中的SO_2

通过去除ＰＡＮ－ＡＣＦ表面Ｈ_２ＳＯ_４水溶液的办法连续模拟脱除烟道气中的ＳＯ_２ＳｅｉｋｉＫｉｓａｍｏｒｉｅｔａｌ（日）引言为了净化空气，希望用较少的投资，建立一种效果好且节能的脱除烟道气中ＳＯ２的方法。尽管用Ｃａ（ＯＨ）２水溶液对烟道气进行湿式脱硫?..     

Si及α－Al_2O_3超细粉对Al_2O_3－ZrO_2－C系材料显微结构的影

本文探讨了Ｓｉ及α－Ａｌ２Ｏ３超细粉对Ａｌ２Ｏ３－ＺｒＯ２－Ｃ系材料显微结构的影响．认为在Ａｌ２Ｏ３－ＺｒＯ２－Ｃ系材料中同时加入Ｓｉ和α－Ａｌ２Ｏ３超细粉，Ｓｉ粉除了与Ｃ生成了ＳｉＣ纤维外，其反应产物ＳｉＯ２还与α－Ａｌ２Ｏ３超细粉及ＺｒＯ２生成了莫来石（Ａ３Ｓ２）和Ａｌ２Ｏ３－ＺｒＯ２－ＳｉＯ２（ＡＺＳ）固溶体，这些新生成的矿物相对试样的显微结构产生重要的作用．     

液态搅拌铸造颗粒增强Al－4％Mg复合材料的微观结构研究

本文以ＴＥＭ和ＥＤＳ为主要分析手段，研究了不同颗粒增强的Ａｌ－４％Ｍｇ复合材料的界面及其基体中的微观结构，探讨了它们的形成原因。结果表明：ＳｉＯ_２颗粒与基体间为反应结合，Ａｌ_２Ｏ_３和ＳｉＣ则基本上为机械结合。     

液态搅拌铸造颗粒增强Al－4％Mg复合材料的微观结构研究EI

本文以ＴＥＭ和ＥＤＳ为主要分析手段，研究了不同颗粒增强的Ａｌ－４％Ｍｇ复合材料的界面及其基体中的微观结构，探讨了它们的形成原因。结果表明：ＳｉＯ_２颗粒与基体间为反应结合，Ａｌ_２Ｏ_３和ＳｉＣ则基本上为机械结合。     

多孔陶瓷薄膜表面形貌研究

用原子力显微镜（ＡＦＭ）观察Ａｌ２Ｏ３、Ａｌ２Ｏ３－ＳｉＯ２及Ａｌ２Ｏ３－ＳｉＯ２－ＴｉＯ２复合陶瓷薄膜的表面形貌,Ｘ射线衍射（ＸＲＤ）分析表明,Ａｌ２Ｏ３薄膜的上为γ－Ａｌ２Ｏ３;Ａｌ２Ｏ３－ＳｉＯ２薄由γ－Ａｌ２Ｏ３和非晶诚ＳｉＯ２组成;而Ａｌ２Ｏ３－ＳｉＯ２－ＴｉＯ２薄膜的相成分为Ａｌ２Ｏ３、ＴｉＯ２、Ａｌ４Ｔｉ２ＳｉＯ１２和非晶态ＳｉＯ２,各相的含量随化学成分变化而变化,ＡＦＭ观察结果表明     

Si及α—Al2O3超细粉对Al2O3—ZrO2—C系材料显微结构的影响

本文探讨了Ｓｉ及α－Ａｌ２Ｏ３超细粉对Ａｌ２Ｏ３－ＺｒＯ２－Ｃ系材料显微结构的影响。认为在Ａｌ２Ｏ３－ＺｒＯ２－Ｃ系材料中同时加入Ｓｉ和α－Ａｌ２Ｏ３超细粉，Ｓｉ粉除了与Ｃ生成了ＳｉＣ纤维外，其反应产物ＳｉＯ２还与α－Ａｌ２Ｏ３超细粉及ＺｒＯ２生成了莫来石（Ａ３Ｓ２）和Ａｌ２Ｏ３－ＺｒＯ２－ＳｉＯ２（ＡＺＳ）固溶体，这些新生成的矿物相对试样的显微结构产生重要的作用。     

CuO－SnO_2纳米晶粉料的Sol－Gel制备及表征

不用金属醇盐而以无机盐为起始物质，采用Ｓｏｌ－Ｇｅｋ法得到了平均晶粒尺寸为２１～２２ｎｍ，ＣｕＯ掺杂的ＳｎＯ_２粉料；运用Ｘ射线衍射（ＸＲＤ）、差热—失重分析（ＤＴＡ－ＴＧ）、透射电镜（ＴＥＭ）及ＢＥＴ比表面（ＳＡ）测定等分析手段对粉料进行了表征．实验表明，ＣｕＯ的掺杂抑制了ＳｎＯ_２晶粒的生长；以无机盐为原料，采用Ｓｏｌ－Ｇｅｌ法制取ＳｎＯ_２（ＣｕＯ）纳米级晶料是切实可行的，将有利于产业化．     

CeO_2质点对Al_2O_3型氧化膜和膜／基体界面的原子结合能的影响EI

采用ＳＩＭＳ测定Ａｌ，Ｎｉ等二次离子的束流强度与阻止电压曲线新技术，研究了ＣｅＯ_２对１１００℃恒温氧化条件下形成的Ａｌ_２Ｏ_３型氧化膜和膜／基体界面处的原子结合能的影响，并结合添加ＣｅＯ_２增加了原子间结合能的实验结果，分析了ＣｅＯ_２影响Ａｌ_２Ｏ_３氧化膜生长动力学的微观机制。     

TiO2/碳纳米短管复合体的制备及光催化性能的研究

采用溶胶-凝胶法制备了TiO2/碳纳米短管复合体,利用X射线衍射仪(XRD)、差热-热重分析仪(TG-DTA)、扫描电子显微镜(SEM)和紫外-可见光谱仪(UV-vis)对复合体的过程和微观结构进行了分析,结果表明:短管与钛酸丁酯的质量比为1%,热处理温度为500℃时,光催化降解活性艳红X-3B效果最好,同时TiO2与碳纳米短管的复合造成TiO2的吸收谱线蓝移.     

Fabrication and characterization of TiO2/short MWNTs with enhanced photocatalytic activity

TiO₂/short MWNTs nanocomposites were prepared by the sol–gel method using butyl titanate and short MWNTs as starting materials in the solvent of isopropyl alcohol. Their photocatalytic activity in the degradation of X-3B was studied. The effects of mass ratio of short MWNTs to butyl titanate, and heat-treatment temperature on the photoactivity of TiO₂/short MWNTs nanocomposites were discussed. For comparison purpose, other photocatalysts were also employed in the photodegradation experiment. Thermogravimetric–differential thermal analysis (TG–DTA), scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV–Vis absorption spectra were utilized to characterize the prepared photocatalysts. The results showed that the TiO₂/short MWNTs nanocomposites synthesized with 1% mass ratio of short MWNTs to butyl titanate had the best photoactivity.     

An algorithm for locating short circuits among N signal paths usingK-port parallel short detector

To locate short circuits on a printed circuit board, a K-port parallel short detector can test K signal paths simultaneously. If the total number of signal paths N on a printed circuit board is larger than K, then we need to divide the testing process into multiple stages such that at most R signal paths are tested in each stage. In this paper, we design a parallel algorithm to locate all the short circuits among the N signal paths on a printed circuit board using a K-port parallel short detector where Ki's such that S_i contains at most K signal paths, and then it bisects S_i into two disjoint sets T_2i-1 and T_2i, (2) it locates all the short circuits in S_i for all i, and (3) it locates all the short circuits between S_i and S_j for all i≠j by testing T_2i-1 against T_2j-1, T_2i-1 against T_2j, T_2i against T_2j-1, and T _2i against T_2j     

短管节流流量特性实验研究

通过毛细管与短管节流气态流量特性的实验研究,对比分析两者的气态流量特性,得出节流短管气态流量与孔径的函数关系,证明节流短管内制冷剂的流量函数与N2的流量函数类似,短管节流与毛细管节流具有相似的气态流量特性,可以将节流短管当作长度较短的毛细管进行研究。     

A modification of UniGrow 2‐parameter driving force model for short fatigue crack growth

In this paper, a modification of the UniGrow model is proposed to predict total fatigue life with the presence of a short fatigue crack by incorporating short crack propagation into the UniGrow crack growth model. The UniGrow model is modified by 2 different methods, namely the “short crack stress intensity correction method” and the “short crack data‐fitting method” to estimate the total fatigue life including both short and long fatigue crack propagations. Predicted fatigue lives obtained from these 2 methods were compared with experimental data sets of 2024‐T3, 7075‐T56 aluminium alloys, and Ti‐6Al‐4V titanium alloy. Two proposed methods have shown good fatigue life predictions at relatively high maximum stresses; however, they provide conservative fatigue life predictions at lower stresses corresponding high cycle fatigue lives where short crack behaviour dominates total fatigue life at lower stress levels.     

型钢高延性混凝土短柱抗震性能试验研究

提出采用高延性混凝土和核心区配置型钢提高短柱的抗震性能和变形能力,设计了2个高延性纤维混凝土（HDC）短柱和2个型钢高延性混凝土（SHDC）短柱试件,通过拟静力试验,研究其破坏形态、变形能力及耗能能力。试验结果表明:试件剪跨比减小,有利于发挥HDC良好的抗剪性能,使HDC短柱表现出良好的延性和耗能能力;核心区配置型钢,可显著提高HDC短柱的延性和耗能能力,提高构件的耐损伤能力;HDC与型钢具有良好的协调变形能力,改善了短柱的脆性剪切破坏模式,使SHDC短柱发生剪切粘结破坏时仍表现出较好的延性;SHDC短柱在不同性能水平下的变形能力明显高于HDC短柱,能满足我国规范对框架结构竖向构件的变形要求。     

Structure and properties of aligned short fibre-reinforced intermetallic matrix composites

Powder injection moulding techniques were utilized to align short fibres (Al₂O₃ and SiC) in a variety of intermetallic matrices (NiAl, MoSi₂ and TaTiAl₂). The alignment was accomplished by extruding a mixture of powders and short fibres with a polymer-based binder through a constricting nozzle. The binder was removed and the powder and fibres were consolidated, producing an aligned short fibrous composite. The effects of powder morphology, fibre volume fraction and fibre diameter on the alignment were demonstrated. Small diameter powders were required to ensure alignment of an appreciable loading of fibres in a powder matrix. Tensile and hardness tests were used to evaluate the effectiveness of the aligned short fibres to strengthen and toughen the matrices. The mechanical behaviour of these aligned short fibrous composites were found to be comparable to similar aligned continuous fibrous composites produced by conventional techniques.     

Alternative Tapping Systems for RRIC 100 Clone from Opening

Ethephon or gas stimulation application is a common practice in rubber cultivation especially in commercial estates. The use of stimulation can be combined with reduction in the intensity of tapping by reducting of cut length. The purpose of this study was to compare and to evaluate the effect of various tapping systems on production and physiology characters from opening. The experiment was carried out in the experimental field of Sembawa Research Centre since March until December 2011. The experimental design was the Completely Randomized Block Design with 6 treatments and 8 replication. The experiment used RRIC 100 clone planted in 2004. The treatments were S/2 d3, S/2 d3 ET2.5% Gal 12/y （m）, S/2 d3 ET2.5% Gal 24/y （2w）, Sc20 U d3 ETG 12/y（m）, Sc20 U d3 ETG 24/y（m）, and Sc20 U d3 ET2.5% Bal 24/y（2w）. The results showed that the tapping system of S/2 d3 ET2.5% Gal 12/y （m） or Sc20 U d3 ETG 12/y（m） can increase production without negative effect on physiology parameters. However, application of gas stimulation on young trees should be used with consideration for the risk of tapping panel dryness. Since the upward tapping tends to result in a thicker cut and latex spillage from the groove, the tapper should be well trained.     

Hotelling's T2 control charts with fixed and variable sample sizes for monitoring short production runs

Short production runs are common in enterprises that require a high degree of flexibility and variety in manufacturing processes. To date, past research on short production runs has little focus on the multivariate control charts. In view of this, fixed sample size (FSS) and variable sample size (VSS) Hotelling's T² charts are designed to monitor the process mean when the production horizon is finite. Optimal parameters to minimize the out‐of‐control (1) truncated average run length (TARL) and (2) expected TARL (ETARL) are provided such that the in‐control TARL is equal to the number of inspections (say I). The numerical study considers the run length performances of the FSS and VSS T² short‐run charts for both known and unknown shift sizes. The VSS T² short‐run chart performs well in swiftly detecting various mean shifts in comparison with the FSS T² short‐run chart. Additionally, the VSS T² short‐run chart is superior to the FSS T² short‐run chart, in terms of the truncated standard deviation of the run length, expected truncated standard deviation of the run length, probability that the chart signals an alarm within the I inspections, ie, P(I) and expected P(I). A case study on the impurity profile of a crystalline drug substance illustrates the implementation of the VSS T² short‐run chart.     

Al2O3@Y3Al5O12纳米短纤维对铝合金基复合材料的增强作用

采用一种具有芯-壳结构的复合纳米纤维增强铝合金复合材料,可以在提高抗拉强度的同时增加塑性。通过真空热压烧结技术制备了Al₂O₃@Y₃Al₅O₁₂复合纳米短纤维增强2024铝合金复合材料。研究了纤维添加质量分数对复合材料致密度、硬度、抗拉强度及延伸率的影响;并探究了芯-壳结构在复合材料增韧中的作用。结果表明:Al₂O₃@Y₃Al₅O₁₂纳米短纤维具有良好的分散性,在超声分散及机械搅拌混粉后均匀吸附在铝合金颗粒表面,无分层及团聚现象;经热压烧结后,Al₂O₃@Y₃Al₅O₁₂纳米短纤维以短纤维形态均匀分散在铝合金基体内,少量添加Al₂O₃@Y₃Al₅O₁₂纳米短纤维起到了桥联和孔洞填充作用,使复合材料致密度和硬度提高;添加质量分数为1wt%时,抗拉强度和延伸率取得最大值,由铝合金的249.3 MPa、2.9%增加到299.1 MPa、4.3%。Al₂O₃@Y₃Al₅O₁₂纳米短纤维的添加可以细化晶粒,阻碍裂纹扩展,且在拔出/断过程中Al₂O₃@Y₃Al₅O₁₂纳米短纤维芯-壳结构的塑性变形起到了增强增韧作用。