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列表点曲线所围面积的计算
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作者 廖卫献 《现代机械》 北大核心 1996年第2期48-48,共1页
本文给出了计算列表点曲线所围区域面积的公式,适用于所有封闭曲线.
关键词 列表点曲线 曲线所围面积 计算
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基于参数曲线及其所围面积的三维树木建模 被引量:11
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作者 林定 陈崇成 +2 位作者 唐丽玉 邹杰 王钦敏 《福州大学学报(自然科学版)》 CAS CSCD 北大核心 2011年第3期367-374,共8页
采用Bezier参数曲线作为求取三维树木建模参数的基本输入,引入参数曲线所围面积的显式代数表达,将曲线所围面积作为权重因子,调整植物体上各功能器官的空间分布,实现给定参量约束下的疏密分布的图形化控制.在实现方面,将曲线的数值计算... 采用Bezier参数曲线作为求取三维树木建模参数的基本输入,引入参数曲线所围面积的显式代数表达,将曲线所围面积作为权重因子,调整植物体上各功能器官的空间分布,实现给定参量约束下的疏密分布的图形化控制.在实现方面,将曲线的数值计算与交互式编辑相分离,分别以动态库和COM控件方式实现,增强了建模系统的可扩展性.实验结果表明,所提出的方法对三维树木建模交互性是有效的,具有普适性,为植物学知识规则应用于形态建模提供一个可视化、交互式的新途径,实现所见即所得的树木建模效果. 展开更多
关键词 参数曲线 所围面积 三维树木 虚拟植物 建模
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定长所围的草地面积——数学综合实践活动案例
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作者 沈百军 《小学青年教师》 2003年第10期31-32,共2页
关键词 数学教学 综合实践活动 教学案例 小学 设计思路 生活情境 “定长所围的草地面积”
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转子进动定理的扩充和完善 被引量:1
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作者 廖明夫 赵清周 《振动.测试与诊断》 EI CSCD 北大核心 2021年第6期1216-1220,1243,共6页
为更深入地揭示转子进动的轨迹特征,提出了关于转子进动轨迹的2个定理。定理1表明,转子进动的任一阶轨迹分量所围面积可直接由同阶频率成分构成的轨迹方程系数矩阵行列式求得。定理2证明,转子进动轨迹矢径在单位时间内所扫过的面积是恒... 为更深入地揭示转子进动的轨迹特征,提出了关于转子进动轨迹的2个定理。定理1表明,转子进动的任一阶轨迹分量所围面积可直接由同阶频率成分构成的轨迹方程系数矩阵行列式求得。定理2证明,转子进动轨迹矢径在单位时间内所扫过的面积是恒定的,而与起始点无关。同时,提出了欧拉复向量的内积法则,即2个欧拉复向量的内积等于2个复向量的幅值与欧拉角之差的余弦三者之积,且符合交换律。利用2个定理和内积法则对转子进动理论进行了补充和完善。结果表明,在转子的运动中,作用力所做的功关于转子的进动是正交的。所得结论对于揭示转子的进动规律和机理、诊断转子故障具有参考价值。 展开更多
关键词 转子 轨迹 定理 进动 轨迹所围面积 复向量 内积法则
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物理坐标图像的应用赏析 被引量:3
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作者 项鸿飞 《物理教学探讨(中学教学教研版)》 2009年第7期24-26,共3页
本文阐述了图像的坐标轴、坐标值(点)、斜率、所围面积及截距等的物理意义.并对其应用以例题形式作了展示。
关键词 坐标轴 坐标值 斜率 所围面积 截距
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速度图像在复杂运动中的运用
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作者 常明安 《科教导刊》 2016年第10Z期137-138,共2页
文章通过对高中阶段物理教学中,对速度图像在复杂运动中的运用详细讲解,论述了如何在教学有效的促进学生将形象思维与逻辑思维的结合,提高物理问题解决的能力。
关键词 速度图像 速度所围面积 形象思维与逻辑思维
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图像“面积法”在高中物理中的应用
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作者 刘加模 《中学生理科应试》 2019年第4期34-35,共2页
在高中物理中,部分物理图像包围的面积表示某一物理量,教师若能教会学生利用面积法来解决一些物理问题,将会给问题的解决事半功倍的效果.本文主要介绍常见的几种物理图像的面积在高中物理解题中的应用.
关键词 教会 所围 物理 图像 高中物理 面积
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Worldwide or Territorial Approach for Individual Income Tax, Which is More Prevalent? 被引量:1
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作者 Connie Shum Jack Fay Gladie Lui 《Journal of Modern Accounting and Auditing》 2017年第4期137-151,共15页
For individuals who are contemplating relocating, how their income will be taxed might be an important factor when deciding whether or not to take up residence in another country. Two income approaches are commonly us... For individuals who are contemplating relocating, how their income will be taxed might be an important factor when deciding whether or not to take up residence in another country. Two income approaches are commonly used around the globe. Worldwide income approach (also known as a global tax system) taxes income from whatever source derived. Territorial income approach taxes only income earned within the country's borders. Using information collected from PricewaterhouseCoopers' website1 that provides information on tax systems used in countries around the world, this paper examines which countries apply worldwide or global income approach and which employ territorial approach to determine the legitimate source of taxable income. The research focuses on countries within: (1) Americas; (2) Asia/Pacific Basin; (3) Europe; and (4) Africa/Middle and Near East. Based on the information collected and presented in this paper, the worldwide approach is much more prevalent (104 countries) than the territorial approach (30 countries). This paper also investigates any specific rules that a particular country has in relation to income to be taxed and residency versus non-residency status of the taxpayers. There appears to be an abundant spectrum of rules relating to residency and domicile for tax purposes among the countries. 展开更多
关键词 individual income tax global individual income tax worldwide/territorial income approach
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Effect of the Microclimate of Underground Systems on the Occurrence of Hibernating Bats
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作者 Grzegorz Klys 《Journal of Environmental Science and Engineering(B)》 2013年第1期36-45,共10页
This study investigates the microclimatic connections between underground systems and the hibernation sites of particular species of bats. The distribution of hibernating bats was analysed in five selected zones desig... This study investigates the microclimatic connections between underground systems and the hibernation sites of particular species of bats. The distribution of hibernating bats was analysed in five selected zones designated Ⅰ-Ⅴ. These zones have a similar relative humidity, diverse temperature ranges inside the system, as well as air flow rates. A multi-year research programme highlighted the relationships between the occurrence of hibernating bats of various species and the microclimate of these particular zones. What is of essential importance are the sites with an air flow in their zones exceeding 0.02 m·s^-1, then is temperature and humidity. The air flow determines more intensive settling of wintering bats (zones Ⅲ, Ⅳand Ⅴ). The zone Ⅱ-tourist zone with periodic air flows and often visited by humans is the least used by hibernating bats. 展开更多
关键词 CHIROPTERA MICROCLIMATE AIRFLOW hibernating bats.
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Who Governs Public Health? Donor Retreat and the Shifting Spheres of Influence in Southern African HIV/AIDS Policy Making
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作者 Gemma Oberth 《Sociology Study》 2012年第7期551-568,共18页
For the last decade, discussions about who governs policy on prevention and treatment of HIV/AIDS have revolved around the controversial relationship between Western donors and the power they have over their recipient... For the last decade, discussions about who governs policy on prevention and treatment of HIV/AIDS have revolved around the controversial relationship between Western donors and the power they have over their recipient governments. While these debates were once politically germane, recent trends show a decline of donor funding, as well as an increase of financial ownership of the epidemic within Southern Africa. Commensurate with this shifting financial influence, some well-governed, wealthy African states are beginning to deviate from global M&E (monitoring and evaluation) indicators. These policy movements, away from global M&E indicators, also correlate with increases in HIV prevalence, which signals the need for further investigation into policy efficacy. 展开更多
关键词 HIV/AIDS policy GOVERNANCE DONOR national strategic plans (NSPs)
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青藏高原北东缘构造演化特征
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作者 舒塞兵 谢富仁 《地壳构造与地壳应力文集》 1999年第1期23-31,共9页
一、区域构造环境青藏高原北东缘包括柴达木盆地以北,阿尔金山以东,龙首山以南,牛首山、罗山以西广大区域,其周边为区域性大断裂所围限,祁连山是这一区域内的主体构造单元。与这一地区相邻的东侧、西侧和北侧都是早已固结并长期处于相... 一、区域构造环境青藏高原北东缘包括柴达木盆地以北,阿尔金山以东,龙首山以南,牛首山、罗山以西广大区域,其周边为区域性大断裂所围限,祁连山是这一区域内的主体构造单元。与这一地区相邻的东侧、西侧和北侧都是早已固结并长期处于相对稳定的陆块(华北地块、新疆地块),在该区的构造演化过程中在外围起限制作用;本区西南是亚洲乃至全球新构造运动最为强烈的青藏块体。 展开更多
关键词 新生代 青藏高原 所围 地块 区域 东缘
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Clinical efficacy of acupoint injection for chemotherapy-induced peripheral neuropathy of patients with breast cancer 被引量:5
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作者 熊志峰 王婷 +3 位作者 甘霖 冉君 闵捷 吕钢 《World Journal of Acupuncture-Moxibustion》 CSCD 2016年第2期20-24,共5页
Objective To observe the clinical efficacy of acupoint injection for chemotherapy-induced peripheral neuropathy (ClPN). Methods Ninety ClPN patients with breast cancer conforming to inclusive criteria were randomly ... Objective To observe the clinical efficacy of acupoint injection for chemotherapy-induced peripheral neuropathy (ClPN). Methods Ninety ClPN patients with breast cancer conforming to inclusive criteria were randomly divided into an acupuncture group (group A), a mecobalamin group (group B) and an acupoint injection group (group C) according to random number table, with 30 cases in each group. In group A, acupuncture was conducted at bilateral Q0chi (I~ LI 11), H6g6 (~ LI 4), Z0s^nlT (~__~ ST 36), S^nyinji^o (^-- ~ SP 6) and Xu^h~i (J~ SP 10); in group B, intramuscular injection with I mL of mecobalamin injection was conducted; and in group C, acupoint selection was the same as group A, and 0.1 mL of mecobalamin injection was injected into each acupoint, respectively. The treatment was conducted once every three days in each group, and the changes of clinical efficacy, nerve electrophysiology and hemorrheology indicators after treatment for 10 times were observed. Result The total effective rate of group C was 93.1% (27/29), which was higher than 78.6% (22/28) in group A and 83.3% (25/30) in group B, and the differences among three groups were statistically significant (all P〈0.01); conduction velocity of lesion nerves was improved in group B and group C, the improvement in group C was obviously superior to the other two groups (all P〈0.01), hemorrheology indicator was improved in group A and group C (both P〈0.05). Conclusion The efficacy of acupoint injection with mecobalamin for breast cancer CIPN was significant, which can not only improve the nerve conduction velocity, but also improve the hemorrheology indicator. 展开更多
关键词 acupoint injection chemotherapy-induced peripheral neuropathy(ClPN) breast cancer
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