半中轴

The simulation floating zone modelwith zero temperature gradient in the middle of the hot rod is proposed to simulate thehalf part of the full floating zone convection,since the temperature gradient in the middleof a full floating zone approaches zero.

根据加热方式的不同，可以将半浮区液桥分为通常半浮区液桥模型、模拟半浮区模型以及改型半浮区模型。通常半浮区液桥模型，液桥热端材料一般选择为金属材料，使得热端温度分布均匀。液桥产生热毛细对流时，在液桥热端内侧存在较大的轴向温度梯度。而在全浮区热毛细对流中，浮区中间的轴向温度梯度在对称条件下应该接近于零。

The axially symmetric torsion of rigid circular shaft of varying diameter embedded in an elastic half space is studied by line-loaded integral equation method, where the problem is formulated by distributions of fictitions fundamental loads PRCHS (point ring couple in half space) along the axis of symmetry in interval of the shaft and is reduced to a one-dimensional and non-singular Fredholm integral equation of the first kind and is easily solved numerically.

弹性半空间；本文用线载荷积分方程法研究嵌在弹性半空间的刚性变直径圆轴的轴对称扭转。利用将"半空间的点环力偶"这一虚的基本载荷沿对称轴的圆轴区间中分布就能使本问题归结为一个一维的非奇异的Ferdholm第一种积分方程，且很易用数值求解。文中给出刚性圆锥，圆柱，圆锥柱嵌在弹性半空间的扭转的数值计算的例并和他人的已知结果相比较。

Results MPR and SSD techniques can acquire lots of important information:(1)rule out the diagnosis of fracture and dislocation and its type can be patient has been injured so badly that cannot take X-ray examination.(2)detect the secret fracture and missing fracture in X-ray examination because of overlap.(3)diagnose the missing transverse fracture in routine CT scan.(4)diagnose the atlantoaxial joint luxation without fracture.

结果 MSCT扫描MPR、SSD技术在寰枢椎外伤中可：(1)对于外伤后病情不适合拍平片者，MSCT能快速、准确地明确骨折、脱位的有无及其类型；(2)MSCT轴位扫描结合MPR能排除因平片结构重叠漏诊的骨折以及平片不易发现的隐匿骨折；(3)MPR对椎体发生的常规轴位扫描易漏诊的水平型骨折线能明确诊断；(4)对于没有骨折的寰枢关节半脱位能提供可靠的依据。

Results MPR and SSD techniques can acquire lots of important information:(1)rule out the diagnosis of fracture and dislocation and its type can be when patient has been injured so badly that cannot take X-ray examination.(2)detect the secret fracture and missing fracture in X-ray examination because of overlap.(3)diagnose the missing transverse fracture in routine CT scan.(4)diagnose the atlantoaxial joint luxation without fracture.

结果 MSCT扫描MPR、SSD技术在寰枢椎外伤中可：(1)对于外伤后病情不适合拍平片者，MSCT能快速、准确地明确骨折、脱位的有无及其类型；(2)MSCT轴位扫描结合MPR能排除因平片结构重叠漏诊的骨折以及平片不易发现的隐匿骨折；(3)MPR对椎体发生的常规轴位扫描易漏诊的水平型骨折线能明确诊断；(4)对于没有骨折的寰枢关节半脱位能提供可靠的依据。

Results MPR and SSD techniques can acquire lots of important information摘要:(1)rule out the diagnosis of fracture and dislocation and its type can be when patient has been injured so badly that cannot take X-ray examination.(2)detect the secret fracture and missing fracture in X-ray examination because of overlap.(3)diagnose the missing transverse fracture in routine CT scan.(4)diagnose the atlantoaxial joint luxation without fracture.

结果 MSCT扫描MPR、SSD技术在寰枢椎外伤中可摘要：(1)对于外伤后病情不适合拍平片者，MSCT能快速、准确地明确骨折、脱位的有无及其类型；(2)MSCT轴位扫描结合MPR能排除因平片结构重叠漏诊的骨折以及平片不易发现的隐匿骨折；(3)MPR对椎体发生的常规轴位扫描易漏诊的水平型骨折线能明确诊断；(4)对于没有骨折的寰枢关节半脱位能提供可靠的依据。

Results MPR and SSD techniques can acquire lots of important information:（1）rule out the diagnosis of frac-ture and dislocation and its type can be when patient has been injured so badly that cannot take X-ray examination.（2）detect the secret fracture and missing fracture in X-ray examination because of overlap.（3）diagnose the missing transverse fracture in routine CT scan.（4）diagnose the atlantoaxial joint luxation without fracture.

结果 MSCT扫描MPR、SSD技术在寰枢椎外伤中可：（1）对于外伤后病情不适合拍平片者，MSCT能快速、准确地明确骨折、脱位的有无及其类型；（2）MSCT轴位扫描结合MPR能排除因平片结构重叠漏诊的骨折以及平片不易发现的隐匿骨折；（3）MPR对椎体发生的常规轴位扫描易漏诊的水平型骨折线能明确诊断；（4）对于没有骨折的寰枢关节半脱位能提供可靠的依据。

The galactosyl oligosaccharides of raffinose series are widely distributed in seeds of many species and are localized in tissues that remain viable after desiccation, including the embryo and aleurone layer of cereals, cotyledons and axis tissues of legumes and other dicots.

棉子糖半乳糖苷系列寡糖广泛分布在许多种植物种子中，并存在于干燥后仍能保持活力的组织内，如禾谷类种子的胚及糊粉层，豆类及其他双子叶植物的子叶和胚轴组织等。棉子糖半乳糖苷系列寡糖在禾谷类种子的非自溶性中央胚乳中不合成，但存在于蓖麻种子的自溶性胚乳细胞中。

Three-axle motor vehicle differential gear damage, such as, the rear axle differential damage to any one, can be the bridge and axle shaft removed, continue to operate.

三轴汽车差速器齿轮损坏，如中、后桥差速器损坏任何一只，都可将该桥传动轴和半轴拆下，继续行驶。

The determination of analysis and improvement scheme of structure defects in pipe cold-drawing machine

针对原半轴齿轮精锻模结构和生产中存在的问题，对半轴齿轮精锻过程进行了初步分析，提出了新的模具结构和半轴齿轮结构的改进方

Main points of the thesis are as follows:(1) The main function models and information relations between these models in the CAPP system in the integrated CAD/CAM project are explained, a new process plan design method is mentioned based on analyses of process plan design. This method is based on the process plan prototype, and develops the prototype little by little until the perfect process plan is completed, the prospect of this method is discussed;(2) The feature abstracting rules and methods are studied, a feature coding system is developed based on GT, all the defined feature models are described by the mathematical methods;(3) The integrated method of CAD/CAPP based on features is mentioned, this method defines a feature exchanging model, and develops an interface software to exchange design data into technology data base, this technology data base includes the design and technology information of the parts;(4) The process plan reasoning method based on features is created, this method uses Mycin algorithm to solve the reasoning of the feature process plan. A process plan making system is developed. In this system part process plan is made by the semi-intelligent method, this method uses the feature reasoning, feature process chain searching and man-computer talking together;(5) The main structure of the HOPE system is introduced, a shaft drawing and its process plan made by this system are shown, the data process problem in process drawing making is also discussed;(6) A new method of describing process rule is introduced, this method uses IfThen rules and neural nets weight values together to describe process rules, the BP algorithm is adopted in this method;(7) The optimal machining sequence problem of the process steps on the same fixturing is discussed, optimal algorithms SA is applied to solve this problem, the result shows that this method is more efficient than the traditional method;(8) All jobs in the thesis are summarized. In order to carry out the research in the future, some rational proposals are given.

全文论述的内容主要有下列几个方面：(1)较为系统地阐述了CAD／CAM一体化工程项目中CAPP系统的主要功能模块及其信息流程，在分析工艺设计过程的基础上，提出了基于特征原型的渐进式工艺设计方法，并探讨了该方法的应用前景；(2)研究了零件特征提取的原则和方法，在成组技术的基础上，开发了一套基于特征的分类编码系统，并在提取零件特征的基础上，定义了零件特征的数据模型，开发了基于轴类零件特征的参数化设计系统；(3)研究了基于特征的CAD／CAPP集成的方法，通过定义零件特征数据模型的存储结构，开发了将设计数据转换到工艺数据库中的接口程序，为后续的CAPP系统提供必要的零件形状和工艺信息；(4)研究了基于特征的工艺推理方法，将Mycin算法应用到工艺决策中，开发了基于特征的工艺推理及工艺方案生成系统，在系统中综合运用特征推理、特征加工工艺链查询及人机对话相结合的半智能化方法确定零件加工工艺；(5)介绍了整个HOPE系统的总体结构，通过运行HOPE系统绘出了一轴类零件的零件图，并生成了该零件的加工工艺方案，初步探讨了基于特征的工序图生成技术中数据处理问题；(6)研究了工艺设计过程中知识如何有效表示的问题，提出了将显式的IF-THEN规则表示与隐式神经网络权值表示相结合的工艺知识表示方法，并利用BP算法进行了工艺知识表示的初步研究；(7)研究了工艺设计过程中同一安装下工步优化排序问题，利用神经网络中基于模拟退火的理论来解决该工步优化排序问题，实践证明该方法较传统的算法具有更高的效率；(8)总结了本文所进行的研究工作，为今后进一步开展工作提出了较为合理的建议。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。