牙哈采油树腐蚀检查分析及对策

介绍塔里木牙哈凝析气田高温高压井口采油树腐蚀的现象，腐蚀机理及采取的措施，对其他油田采油树腐蚀的防治起到指导借鉴作用。     

Physicochemical and Sensory Evaluation of 'Rocha' Pear Following Controlled Atmosphere Storage

ABSTRACT: The effects of several processing factors (storage time, time in the open air at room temperature, and overhead concentrations of O₂ and CO₂) on color, firmness, polyphenol oxidase (PPO) activity, and sensory attributes of pears (cv. Rocha) grown in 2 locations were studied using a multiple linear regression model. Backward elimination (F ≥ 0.005) was used to assess the significant factors. Extended storage time, long‐time exposure at room temperature, and high O₂ concentration played major roles on color changes assessed instrumentally and further confirmed by a sensory panel. Firmness was strongly affected by storage time and by time in the open air at room temperature. Finally, PPO activity was dependent on the growing location.     

Empirically derived subtypes of adolescent depression: Latent profile analysis of co-occurring symptoms in the Treatment for Adolescents with Depression Study (TADS).

A latent profile analysis was conducted on the co-occurring symptoms of 423 adolescents diagnosed with major depressive disorder as part of the Treatment for Adolescents with Depression Study (TADS), a multisite, randomized treatment trial. The participants had a mean (SD) age of 14.6 (1.5) years; of the sample, 45.6% was male and 73.8% was white. Scores on the primary subscales of Conners' Parent Rating Scale-Revised were used as indicators in the analysis. Five classes of symptoms best described the clinical presentation of adolescents enrolled in the TADS. Of the adolescents in the sample, 80% were assigned to classes with clinically significant elevations on 1 or more subscales of the Children's Depression Rating Scale-Revised. The 5 classes met empirical criteria for distinctiveness and were validated against clinical diagnoses, child-rated symptoms, and clinician-rated functional impairment. The findings are consistent with prior studies that showed a high rate of co-occurring symptoms among depressed adolescents. The discussion focuses on understanding subtypes and comorbidity in adolescent depression as well as the implications for treatment and for prevention. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Data decomposition using independent component analysis with prior constraints

In many data analysis problems, it is useful to consider the data as generated from a set of unknown (latent) generators or sources. The observations we make of a system are then taken to be related to these sources through some unknown function. Furthermore, the (unknown) number of underlying latent sources may be less than the number of observations. Recent developments in independent component analysis (ICA) have shown that, in the case where the unknown function linking sources to observations is linear, such data decomposition may be achieved in a mathematically elegant manner. In this paper, we extend the general ICA paradigm to include a very flexible source model, prior constraints and conditioning on sets of intermediate variables so that ICA forms one part of a hierarchical system. We show that such an approach allows for efficient discovery of hidden representation in data and for unsupervised data partitioning.     

25MVA矿热炉炉眼烧损原因及开堵眼机的开发使用

对炉眼烧损原因进行了分析，矿热炉通过使用开堵眼机，减少了炉眼烧损，解决了跑眼频繁、出铁口使用寿命短的问题，并取得了一定的经济效益。     

电控柴油机的原理及应用前景

电控柴油机以其节能、环保、易于控制等特点。获得了广泛的应用。为了更好地了解该项新产品，使其尽早在石油机械上推广使用。提升中国石油机械的品质，文章对电控柴油机的特点、结构及应用前景进行了讨论。     

Cu-Cr合金高温氧化行为分析

该文用热分析天平，结合金相、X射线衍射(XRD)、扫描电镜(SEM)和能谱(EXD)研究了Cu—Cr合金在不同温度下的氧化行为。结果表明，Cu—Cr合金在700℃-900℃氧化符合抛物线规律，其最外层氧化膜为CuO，内层为Cu2O和Cr2O3，铬有助于提高合金的抗氧化能力。     

不平坦的三角洲前缘席状砂--来自露头和地下的证据

延长剖面发育的三叠系延长统三角洲前缘席状砂．平面上呈席状，垂向上表现为砂泥岩互层，剖面上可见不同规模的水下分流河道砂岩透镜体。大庆油田三角洲前缘席状砂解剖发现．即使在外前缘相带．席状砂仍然具明显的水道特征。由于湖盆三角洲受波浪和潮汐的作用较小，受河漉作用较强，分流河道向前延伸直至三角洲的前端，貌似平坦的席状砂前缘实际上分布着大大小小的分流河道，河道的迁移就形成了由多个宽厚比极大的对称或不对称的透镜状单元叠加而成的三角洲前缘席状砂。三角洲前缘席状砂的建筑结构分析表明，貌似平坦简单的席状砂实际上是一个复杂的非均质体．储层物性的非均质变化受砂体建筑结构的控制具有明显的层次性规律。     

An engineering process for the verification of real-time systems

The complete verification of the timing properties of a large critical system cannot be undertaken in a single step or with a single method. In this paper we present a process that links together a number of techniques and approaches that cover all stages of development from requirements analysis to code testing. The key elements of the process are: a constrained form of timed automata that uses delay and deadline to define temporal behaviour, notions of rely and guarantee to cover temporal dependencies, model checking for design verification, SPARK and Ravenscar restrictions for programming, and scheduling and response time analysis for asserting implementation compliance. Extended examples of the use of the process are given.     

谈谈职业教育的大众性

对职业教育的大众性问题进行了论述、实证分析和理论、政策、改革等思考。