对航迹计算法几点误解的剖析

针对目前航海人员对航迹计算法产生的几点误解进行了全面的剖析 ,指出应如何正确理解航迹计算公式的图解法 ;旨在帮助航海驾驶员消除误解 ,引导这一方法的正确运用。     

“形类”理论及其在汉语中的运用

布龙菲尔德和霍凯特的许多语言学理论都具有开创性,而且对各国语言学都产生了深远的影响。他们关于语言描写与研究的原则、术语与方法被广泛地借鉴与运用,“形类”理论是其中的重要理论。     

密蒙花不同部位挥发性成分研究

文章以贵州安顺地区野生密蒙花为原料,分别提取其干花、干叶精油,并应用GC/MS/DS技术,在干叶精油中共检出48种物质,鉴定38种,其主要成分由醇、酸、烷等三类化合物构成,涉及化合物共22种,次要成分由酮、醛、醚等三类化合物构成,涉及化合物共11种。在干花精油中共检出34种物质,并全部鉴定,其主要成分由醇类化合物构成,涉及化合物共18种,次要成分由醚、酮、酸、醛、烷等五类化合物构成,涉及化合物共14种。结果表明,由于花、叶处于植株的不同部位,生理作用各不相同,故所得精油的挥发性成分有较大的差异;此外,与大多数巳知的植物精油相比,密蒙花精油中酯类化合物的品种及含量均很低,这是其鲜花香气浓郁但欠柔和的重要原因。     

轴类零件矫直机在线测控系统

本文从工作原理和实现方法两个方面介绍了一种新型的轴类零件矫直机自动在线测控系统的工艺流程、标定原理、软硬件设计及其性能特点。     

Transient Responses of Flexible Non—uniform Spinning Shaft with Nonlinear and Asymmetric Supports

In this paper ,a hybrid approach was developed to investigate the transient responses of a multi-span non-uniform flexble spinning shaft with nonlinear and asymmetric supports.The non-uniform spinning shaft with variable parmeters was modeled as a Bernoulli-Euler beam column with sectional constant cross-section properties by the finite element method.The supporting stiffness behavior of the nonlinear supports was described as a piecewise-linear and asymmetric model.The equations of motion in the matrix form of a multi-span non-uniform spinning shaft with nonlinear and asymmetric supports were formulated using Hamilton‘s principle and the assumed mode method.As an example,a spinning rocket with many variable stiffness supports was numerically simulated by the direct integration method.The transient response and dynamic behavior of this rotate-dynamic system are analyzed.     

不采用跟刀架细长螺杆的加工

一般工件长径比大于25（L／D〉25）时称为细长轴。为防止工件受径向切削分力的作用而产生弯曲变形,常用中心架或跟刀架做辅助支撑,以增加工艺系统刚性。文中通过螺杆的工艺研究分析,在不使用跟刀架的情况下完成细长螺杆的加工。     

试论文学作品语言对语法规范的突破

语言运用通常要求合乎语法规范．就是合乎语法的一般规则——培法通则。但在实际运用的过程中总有不合规范的现象。这里的不合规范不是指运用语言的错误,而是指创造性地运用语言表现出词语个性的现象。这种现象在文学作品中表现的尤为突出。本文摘录了2008年第4期《小说月报》中存在词语个性现象的例子,从词性、语义、搭配的角度对这种现象进行描写分析．说明文学作品对语法规范的突破．以期探讨语言运用的丰富多彩,灵活多样。     

高压负荷隔离开关及熔断器在电网中的应用

目前,35kV变电站的规模正向综合自动化的方向发展.文章根据这种变电站各级保护的整定值计算及现场运行的经验加以阐述.对35kV高压负荷隔离开关及高压熔断器配合选择在电网中的应用进行了探讨.     

采购管理对汽车备件库存控制决策影响探讨

针对汽车备件库存管理工作,指出汽车备件库存控制的意义和重要性,并从采购管理对汽车备件库存控制决策的影响分三个方面探讨,达到对汽车备件库存进行有效控制和科学管理。     

Ball launch conditions for skilled golfers using drivers of different lengths in an indoor testing facility

Abstract

The displacement of the golf ball struck by a driving club is affected by several player characteristics and equipment parameters and their interrelationships. Some modelling and simulation studies have shown a relationship between shaft length and clubhead speed, supported by a few experimental studies. The aim of the present study was to examine the relationship between driver length and ball launch conditions in an indoor test facility using a ball launch monitor. Nine males considered to be skilled golfers participated in the study. Four driving clubs of total length 117, 119, 124, and 132 cm were assembled from commercially available components and were used to strike golf shots while initial ball velocity, backspin rate, and launch angles were measured. Statistical analysis identified a significant difference in initial launch speed due to club length, a significant difference between participants, but no difference between the trials for a given golfer. A positive trend was noted between backspin and launch angle for all four clubs, and significant inverse associations between initial launch speed and backspin rate and launch angle. However, the combined launch conditions associated with increasing length were not considered optimal, with uncontrolled swingweight and moment of inertia effects considered to be limiting factors.