钢液真空循环精炼过程的物理模拟

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ａｓａｓｅｃｏｎｄａｒｙｓｔｅｅｌｍａｋｉｎｇｔｅｃｈｎｏｌｏｇｙ ,ｔｈｅＲＨ(Ｒｕｈｒｓｔａｈｌ Ｈｅｒａｅｕｓ)ｖａｃｕｕｍｃｉｒｃｕｌａｔｉｏｎｒｅｆｉｎｉｎｇｐｒｏ ｃｅｓｓｈａｓｂｅｅｎａｐｐｌｉｅｄｗｉｄｅｌｙａｎｄｄｅｖｅｌｏｐｅｄｒａｐｉｄｌｙｉｎｐｒｅｖｉｏｕｓｆｏｕｒｄｅｃａｄｅｓ .Ｗｉｔｈａｃｏｎｔｉｎｕｏｕｓｌｙｇｒｏｗｉｎｇｄｅｍａｎｄｆｏｒｈｉｇｈｑｕａｌｉｔｙａｎｄｈｉｇｈｌｙｃｌｅａｎｓｔｅｅｌ,ｉｔｈａｓｎｏｗｂｅｃｏｍｅ ,ｔｏａｃｏｎｓ…     

一个交换半群的元素的表示形式

在数集的基础上,在整数域上建立了一个新的交换半群,并在有理数域、实数域和复数域上进行了推广;作为应用,讨论了其元素的表示形式。     

表面处理工艺在修复脱粉机分配盘的应用

引进德国进口二手设备KSΦ5．7M干式脱粉机，经修复后用于潘三矿原煤脱粉；介绍了修复脱粉机分配盘组件的表面处理工艺过程和如何做好氧化处理前表面的准备、氧化处理、涂油等工序流程；使用效果表明，分配盘的耐比性和耐磨性较好，为修复进口脱粉机和推广脱粉工艺作了有益的尝试。     

基于轮廓跟踪的二值图像去毛刺算法

介绍对二值地图图像矢量化过程中的线跟踪操作之前的去毛刺算法,应用此算法可以得到更好的线跟踪效果。     

用二叉树解决出栈序列问题

利用二叉树与栈序列的关系,给出了当入栈序列为{1,2,3,……n}时如何得到所有可能的出栈序列的方法,并用C++编程实现了这一算法.另外给出了判断一个序列不是入栈序列{1,2,3,……n}的出栈序列的结论,并用二叉树的方法给出了证明,通过实例验证了以上结论.     

论人事档案管理中的矛盾及其解决之道

当前,我国人事档案管理面临着管理观念、管理功能、管理力度的矛盾。要最大限度地发挥人事档案的作用,就必须在人事档案的日常管理中注重协调性,把握层次性,讲究和谐性。     

异步二进制可逆计数器的设计

通过对异步二进制加法，减法计数器的分析，进一步设计出既能完成加法计数又能完成减法计数的逻辑电路即可逆计数器，并对它进行实验验证。     

短篇故事《鸡蛋》的结构主义管窥

在短篇故事《鸡蛋》中,五个“二元对立”构成了文本的深层结构:物质层面的“贫穷”与“富贵”的对立;地理层面的“乡村”与“城市”的对立;思想层面的“知足”与“进取”的对立;文化层面的“梦想”(美国梦)与“成功”的对立;阶级层面的“下层”与“上层”的对立。该深层结构的编织“梭子”则是“父亲”和“母亲”望子成龙的心理动力。     

A New Perspective on the Effects of Covariates in Mixture Models

In this simulation study, we explored the effect of introducing covariates to a growth mixture model when covariates were also generated by a mixture model. We varied the association between the latent classes underlying the growth trajectories and the covariates, the degree of separation between the latent classes underlying the covariates, the number of covariates included, and amount of missing data in the growth data. We found that adding covariates to the growth mixture model generally hurt class recovery except where the latent classes underlying the growth trajectories and the covariates were the same or very strongly associated, and there was a large degree of separation between the classes underlying the covariates. We found that when covariates were introduced, entropy might no longer be an accurate indicator of the distinctiveness of the growth trajectory classes.     

A Note on the Use of Mixture Models for Individual Prediction

Mixture models capture heterogeneity in data by decomposing the population into latent subgroups, each of which is governed by its own subgroup-specific set of parameters. Despite the flexibility and widespread use of these models, most applications have focused solely on making inferences for whole or subpopulations, rather than individual cases. This article presents a general framework for computing marginal and conditional predicted values for individuals using mixture model results. These predicted values can be used to characterize covariate effects, examine the fit of the model for specific individuals, or forecast future observations from previous ones. Two empirical examples are provided to demonstrate the usefulness of individual predicted values in applications of mixture models. The first example examines the relative timing of initiation of substance use using a multiple event process survival mixture model, whereas the second example evaluates changes in depressive symptoms over adolescence using a growth mixture model.