统计学导语教学内容探析

为改进统计学导语教学,从3个方面论述了统计学导语教学的意义,归纳了统计学导语教学的要点,即统计工作过程分析、统计认识规律分析、统计资料分析、基本计算题分析等。

ZL50系列轮辋螺栓品质控制与品质特性分析

为了更好的控制轮辋螺栓的品质,使螺栓的品质处于长期稳定状态,降低返修成本,提升轮辋螺栓的安全性能,提高装载机的整车品质,对轮辋螺栓的结构特性、品质控制方法进行全面分析。通过统计分析工具对轮辋螺栓的常用性能进行过程能力及品质状态分析,查找影响轮辋螺栓品质的关键品质特性,提出有效的改进方案和控制手段。

攀钢高速钢轨生产技术现状及优化探讨

攀钢高速钢轨主体生产设备、精整检测技术处于国内领先地位。介绍了攀钢高速钢轨的冶炼、连铸、轧制、精整等关键工艺及检测技术现状,对降低冶炼能耗、实现连铸过程自动化、精轧孔型优化提出了建议,对建立基于激光检测技术的轧制参数自动优化系统、建立基于图像检测技术的热态钢轨表面缺陷在线检测系统、建立基于统计过程分析的质量控制系统进行了探讨。

SPC在气相色谱仪检测农药残留中的应用

为提高和控制气相色谱仪检测农药残留结果的准确性,介绍了统计过程控制(SPC)应用于验证气相色谱仪检测农药残留的准确性能,分析检测过程中可能存在的误差,预防因设备造成的数据失真情况,并着重阐述了如何应用SPC进行数据结果判断的过程。

“玉柴”杯全国QC小组成果发表赛荟萃

玉柴机器股份有限公司——质量追求,永无止境 玉柴公司通过多年来普及质量管理教育,提高了全员质量意识,并通过推行员工收入与质量水平评价挂钩和应用统计过程分析(SPC),实现了制造过程质量预警预报,不断追求产品零缺陷。

Multivariate Statistical Process Monitoring of an Industrial Polypropylene Catalyzer Reactor with Component Analysis and Kernel Density Estimation

Abstract Data-driven tools, such as principal component analysis （PCA） and independent component analysis （ICA） have been applied to different benchmarks as process monitoring methods. The difference between the two methods is that the components of PCA are still dependent while ICA has no orthogonality constraint and its latentvariables are independent. Process monitoring with PCA often supposes that process data or principal components is Gaussian distribution. However, this kind of constraint cannot be satisfied by several practical processes. To ex-tend the use of PCA, a nonparametric method is added to PCA to overcome the difficulty, and kernel density estimation （KDE） is rather a good choice. Though ICA is based on non-Gaussian distribution intormation, .KDE can help in the close monitoring of the data. Methods, such as PCA, ICA, PCA.with .KDE（KPCA）, and ICA with KDE,（KICA）, are demonstrated and. compared by applying them to a practical industnal Spheripol craft polypropylene catalyzer reactor instead of a laboratory emulator.

Nonlinear Statistical Process Monitoring and Fault Detection Using Kernel ICA

A novel nonlinear process monitoring and fault detection method based on kernel independent component analysis(ICA) is proposed.The kernel ICA method is a two-phase algorithm:whitened kernel principal component(KPCA) plus ICA.KPCA spheres data and makes the data structure become as linearly separable as possible by virtue of an implicit nonlinear mapping determined by kernel.ICA seeks the projection directions in the KPCA whitened space,making the distribution of the projected data as non-gaussian as possible.The application to the fluid catalytic cracking unit(FCCU) simulated process indicates that the proposed process monitoring method based on kernel ICA can effectively capture the nonlinear relationship in process variables.Its performance significantly outperforms monitoring method based on ICA or KPCA.

Expression and significance of cyclooxygenase-2 in human lung cancer

Objective: We aimed to examine the expression of cyclooxygenase-2 and the relationship with the pathological types, TNM stage, lymph node metastasis, the degree of differentiation, smoking and the survival. Methods: Immunohistochemical staining method was used to examine the expression of cyclooxygenase-2 of 121 cases of lung cancer and three control groups. The data were statistically analyzed. Results: Compared with the health group, cyclooxygenase-2 was over expressed in the inflammatory tissue(P = 0.036), lung adenocarcinoma(P = 0.005) and squamous carcinoma(P = 0.047). Compared with patients without lymph node metastasis, cyclooxygenase-2 was over expressed(P = 0.033) in patients with lymph node metastasis. Compared with high differentiation group, cyclooxygenase-2 was over expressed(P = 0.004) in low differentiation group. Compared with non-smokers, the expression of cyclooxygenase-2 increased in smokers(P = 0.000). The median survival time of patients that the expression of cyclooxygenase-2 were negative was 9 months(95% CI, 5.6–12.4 months). The median survival time of patients that the expression of cyclooxygenase-2 were positive was 5 months(95% CI, 3–7 months). They was statistical difference(P = 0.001). Conclusion: Overexpression of cyclooxygenase-2 is associated with pathological types, TNM stage, lymph node metastasis, degrees of differentiation, smoking and prognosis in lung cancer.

Physicochemical Properties of Banana Flour as Influenced by Variety and Stage of Ripeness： Multivariate Statistical Analysis

Physicochemical properties of banana flour （BF） were studied in two varieties （Cavendish and Dream） and two stages of ripeness （green and ripe）. BF＇s were analyzed for pH, total soluble solids （TSS）, water holding capacity （WHC） and oil holding capacity （OHC） at 40℃, 60 ℃ and 80 ℃, color values L＊, a＊ and b＊, back extrusion force and viscosity. Physicochemical data were analyzed by Multivariate Analysis of Variance, discriminant analysis and cluster analysis. All statistical analyses showed that physicochemical properties of BF prepared from different variety and stage of ripeness were different from each other. Viscosity, WHC40, WHC60 and TSS were recommended methods for discrimination between banana flour prepared from the two varieties, whilst viscosity, WHC60 and WHC80 were suggested for differentiation of banana flour prepared using green and ripe banana.

The Use of Task-Based Activities to Improve Listening and Speaking Skills in EFL Context

The aim of this study was to improve EFL learners＇ English listening and speaking skills at a State University in Turkey, School of Foreign Languages, Department of Basic English B1 and BI＋ groups through task-based activities. The participants were 56 in total, studying in the academic year of 2014-2015 Spring Fall. The instruments used for collecting data were 16 lesson plans and the speaking and listening quiz results as post-tests. The data were statistically analyzed by mean, max, and min values of the scores. Teaching process and the lesson plans were recorded by researcher then presented in essay form. After the implementation and the post-tests, the participants＇ opinions about the task were collected as an interview. The results of the study showed that B1 groups did not get significant results from listening test and get nearly significant scores from speaking test while the listening and speaking results of BI＋ groups through task-based learning after the implementations were highly significant, which shows that their participation in the task-based activities in the classroom reflected the results positively. Also the students＇ opinions about task-based learning and teaching activities were respectively positive. As a result, it can be said that task-based activities play a significant role in improving listening and speaking skills in EFL settings.

Culture of Scenedesmus acuminatus in Corn Steep Liquor

Microalgae have been evaluated as a source of lipids for biodiesel production. They can be grown on effluent and produce biomass while removing organic and mineral components from the medium. The use of agro-industrial wastes for the production of microalgae is an alternative to reduce the costs related to the composition of the culture medium, thus reducing operational costs considerably. This work was conceived as a research about the cultivation of microalgae Scenedesmus acuminatus on the substrate composed by corn steep liquor. A central composite design （CCD） was carried to study the influence of the effluent and inoculum concentration on the chemical oxygen demand （COD） of the culture. Statistical analysis indicated that the percentage of inoculum and effluent had an influence on the COD. The cultivation, together with the coagulation procedure, was efficient for the removal of organic matter, verified through the COD reduction and changing of pH value. These two parameters reached the appropriate level according to the standard required by current legislation.

Relationship Between English Learning Strategies and Learning Style Preferences： An Empirical Study

In recent years, research emphasis in the field of SLA （second language acquisition） has shifted to the study of the learning process and behaviors of learners than that of teachers. Researches concerning the learners＇ language learning strategies and learning styles have been conducted in different cultural backgrounds. However, comparatively speaking, there are few studies focusing on the relationship between language learning strategies and learning style preferences in English learning among Chinese students. This paper elaborates on the research questions and hypotheses according to the English Learning Questionnaire, which consists primarily of SILL （Strategy Inventory for Language Learning） （Oxford, 1990） and PLSP （Perceptual Learning Style Preference） Survey （Reid, 1987） to identify their English learning strategy uses and learning style preferences. Then, with statistical analysis （by SPSS （Statistical Product and Service Solutions）） of the results of the questionnaire, discussions are made on the correlation between learning strategies, learning style preferences, and their gender differences, followed by pedagogical implications for English teaching and learning in the university settings in China.

A Novel Bit-level Image Encryption Method Based on Chaotic Map and Dynamic Grouping

In this paper,a novel bit-level image encryption method based on dynamic grouping is proposed.In the proposed method,the plain-image is divided into several groups randomly,then permutation-diffusion process on bit level is carried out.The keystream generated by logistic map is related to the plain-image,which confuses the relationship between the plain-image and the cipher-image.The computer simulation results of statistical analysis,information entropy analysis and sensitivity analysis show that the proposed encryption method is secure and reliable enough to be used for communication application.