PASSIM8K接装机滤嘴烟支切割鼓轮尘槽改进

通过对PASSIM接装机最后切割鼓轮尘槽进行改进,利用鼓轮体内部的负压吸风及时将切割尘末吸除,不但使成品滤嘴烟支切口光滑平整,保证了烟支的外观质量,而且也减少了打刀、同步齿形带断裂损坏等问题,减少了因频繁清理而停机的次数和维修时间,提高了设备的有效作业率．在维护和保养最后切割部件时也更加方便,节时省力．     

Degradation of EB-PVD thermal barrier coatings caused by CMAS deposits

In aero-turbine engines, thermal barrier coatings (TBCs) must be capable to withstand harsh environments, such as high-temperature oxidation and hot-corrosion. Recently, a new failure mode of TBCs caused by calcium–magnesium–alumina–silicate (CMAS) glass has attracted increasing attention. In this paper, yttria stabilized zirconia (YSZ) TBCs produced by electron beam physical vapor deposition (EB-PVD) were exposed to CMAS deposits at 1250 1C. The microstructure evolution and failure mechanism of the coatings were investigated. It has been shown that CMAS glass penetrated into the YSZ ceramic layer along the inter-columnar gaps and interacted with YSZ. As a result, an interaction zone of about 20 mm thickness, which was the mixture of CMAS and YSZ with equiaxial structure, was formed in the YSZ surface layer after 4 h heat-treatment at 1250 1C. Meanwhile, yttria in YSZ layer as a stabilizer was dissolved in CMAS glass and caused accelerated monoclinic phase transformation. After 8 h heat-treatment, degradation of YSZ TBC occurred by delamination cracking of YSZ layer, which is quite different from the traditional failure caused by interfacial cracking at the YSZ/metallic bond coat. Physical models have been built to describe the failure mechanism of EB-PVD TBCs attacked by CMAS deposits.     

Catalytic nucleation of a meta-stabled phase in phase-seeded undercooled Fe75Ni25 melts

Undercooled Fe75Ni25 melts were phase-seeded by a high purity iron. It was found that above a critical undercooling,△Tc = 135 K, a metastable δ phase (b.c.c) solidifies from the iron-seeded melts instead of a thermodynamically stable γ phase (f.c.c). While undercooling of the melt (△T ) is below △Tc, solidification of the γ phase prevails in the iron-seeded melts. For the undercooled melts subjected to spontaneous nucleation, the γ phase always solidifies. After solidification, the as-solidified γ phase transforms completely to martensite; whereas the as-solidified metastable δ phase partially transforms to the γ phase, and then to martensite. The untransformed δ phase retains as a -ferrite particles in the microstructures. Based on the classical nucleation theory, catalytic nucleation of the metastable δ phase in the phase-seeded undercooledFe75Ni25 melts was analyzed. It was quantitatively demonstrated that when△T>△Tc, the formation of the δ phase can be ascribed to a better catalytic effect of the iron on its nucleation than that on the nucleation of the γphase.     

Transient photoconductivity in a-(Se80Te20)100 xAgx (0rxr4) thin films

Bulk material of (Se80Te20)100 xAgx (0rxr4) system was prepared by using a conventional melt quenching technique. Thin films of a-(Se80Te20)100 xAgx (0rxr4) were deposited by the vacuum evaporation technique at a base pressure of 10 4 mbar onto well-cleaned glass substrates. Temperature dependence of electrical conductivity in the temperature range of 263–333 K has been studied. There is increase in the value of conductivity with increase in temperature as well as with Ag content. The measurements of intensity dependence of photoconductivity show that the photoconductivity increases with intensity as a power law where the power is found to be between 0.5 and 1.0, representing the continuous distribution of traps. Rise and decay of photocurrent with time at room temperature at different light intensities for (Se80Te20)98Ag2 thin film samples have also been reported. The results have been explained on the basis of the Dember voltage and interaction between photoexcited holes and the trapped electrons on the surface.     

Evaluation of plasma sprayed YSZ thermal barrier coating with the CMAS deposits infiltrati on using impedance spectroscopy

The yttria-stabilized zirconi a (YSZ) thermal barri er coatings (TBCs) prepared by atmo-sp heric plasma spraying with different heat treatment period at the temperature of 1250°C were studied in the present investig ation. Electrochemical impedance spectroscopy (EIS) was employed to non-destructively examine the impedance and capaitance behavior of free standi ng YSZ coatings deposited by plasma spray with CMAS (calcium–magnesium–alumino-silicate) infiltration. Equivalent circuit was established on the basis of the biomodal structure in coatings. The sintering behavior of the coatings can be reflected by the changes of resistance and capacitance of the coating . By EIS , the microstructure evolution of the coating with CMAS deposits was discussed in detail.     

基于机器学习的卫星遥感水质富营养化评价——以合肥市环城河为例

以合肥市环城河为研究对象,使用线性回归、随机森林、支持向量回归和套索回归等机器学习模型挖掘Landsat8卫星数据和水质参数之间的关系,对遥感影像值的反射率和水质参数进行建模,并比较了4种不同模型的表现.结果显示,随机森林模型的表现最好,对TN、TP、NH3-N反演模型的精度都能达到0.7以上;反演的水质参数浓度分布图表明TN、TP在环城河东北段的污染最严重,而NH3-N则在西南段的污染最严重;从水体富营养化分布图可以看出,环城河东段水体呈现中度营养状态.     

集成机器学习与面向地理对象影像分类的大区域林地信息提取及其泛化能力探讨

采用面向地理对象的影像分析法,从祁连山区选择其中一幅典型区域采集训练样本,分别采用支持向量机、随机森林和深度神经网络法3种机器学习方法进行训练,在此基础之上从毗邻区域多时相Landsat 8 OLI影像中提取出整个祁连山区青海云杉林的空间信息,并从精度评价和邻接区域边界一致性等方面对支持向量机、随机森林和深度神经网络法3种分类器的泛化能力进行了比较.结果表明,深度神经网络法的信息提取精度最高,泛化能力最好,对50幅影像的平均总体精度达到96.63%, kappa系数为0.78.     

基于SASMBR的城镇污水PN/ANAMMOX研究

基于目前短程硝化–厌氧氨氧化(partial nitritation and anammox, PN/A)工艺处理城镇污水中反应器运行不稳定和氮去除负荷低的问题, 本文设计一种新型复合生物反应器: 序批式–折流板–分置膜生物反应器(sequencing batch-baffled-separate membrane bioreactor, SASMBR)。将该反应器应用于PN/A工艺处理城镇污水, 探究反应器的性能, 并对SASMBR运行PN/A工艺的运行成本进行分析。结果表明, 采用SASMBR 反应器运行PN/A工艺处理城镇污水, 能够实现高效稳定的脱氮效果, TN去除率达到80%~85%, 氮素去除负荷(nitrogen removal rate, NRR)达到0.20~0.22 kgN/(m^-3·d^-1), 出水TN浓度维持在8 mg/L以下。16S rRNA基因测序分析发现, 短程硝化SASMBR反应器内设置的折流板能够富集氨氧化细菌(ammonia oxidation bacteria, AOB), 确保短程硝化SASMBR反应器的良好性能; 厌氧氨氧化SASMBR内固定在折流板两侧的无纺布可以有效地持留厌氧氨氧化菌(ammonium oxidizing bacteria, AnAOB), 同时, 厌氧氨氧化SASMBR内丰度升高的AOB可以为AnAOB 提供生长的厌氧环境和 NO₂^--N 基质, 使厌氧氨氧化SASMBR反应器能够快速启动和高效稳定运行。SASMBR的运行成本为0.037 元/m³, 比传统城镇污水处理厂的运行成本大幅度降低。     

CsMgCl3:Ni2+晶体的EPR参量研究

采用Zhao[1]等提出的μ-k-α配位场模型和Newman迭加模型及Marcfarlane的微扰环方法,通过拟合平均共价系数(N),统一地解释了强场下CsMgCl3:Ni2 晶体的顺磁g因子及零场分裂D值.g∥、g⊥和D值的计算结果分别为2.231、2.275和2.706,与实验值2.24、2.27和2.70非常吻合.     

姬塬油田长8油藏注水井欠注主控因素

姬塬油田长8油藏具有欠注井数多、欠注程度高、形成原因复杂等问题,造成地层能量低和油井递减快,目前已成为制约油井稳产的重要因素之一。针对这一问题,从地质因素和开发因素出发,系统分析了储层渗透率、储层微观特征、敏感性、润湿性、注入水水质和水型配伍性等对注水井欠注的影响,在此基础上,建立了主成分分析(PCA)和最大隶属度相结合的欠注主控因素判别方法,以油田133组欠注井数据为样本,求取了24项关键特征参数的影响权重,发现储层物性、注入水水质和水型配伍性是对姬塬油田欠注影响最为显著的因素;实例应用表明,该方法能够定量、准确地判别注水井的欠注主控因素,为后续有针对性地制定治理措施提供依据。