充分的数量

The effect of tribology factors on bearing vibration is studied experimentally. AR model and WPT are used to processing the normal arid abnormal signals. The results are as follows:1. The vibration of ball bearings is caused by the tribology action of contact pairs of ball and ring races and has the essential of tribo-dynamics. Any factors affecting the tribology characteristics of contact pairs will affect vibration and noise of bearings consequently.2. Vibration characteristics of bearing keep almostly unchanged with the increasing of axial load expecting the increasing of nature frequencies. When radial load increasing with axial load unchanged, nature frequencies keep unchanged but some new vibration peaks appears in the spectrum.3. Vibration amplitudes are damped and nature frequency are enhanced with sufficient lubrication. Vibration and noise of bearings increase obviously and roar can happen and the contact surfaces scratch slightly under insufficient and unclean lubrication state. Bearing will be disabled in a few minutes without any lubrication.4. Bearing vibration is unstable under low speed. With the speed increasing, the vibration become stable and natural frequencies increase slightly but the amplitudes increase apparently.5. Bearing vibration can be excited only by some harmonics ofwaviness without lubrication and by all harmonics with lubrication based on the theoretical analysis.6. The nature frequencies of ball bearings decrease with the increasing sizes. When international clearance increasing, nature frequencies decrease in radial and increase in axial and angular and the amplitudes increase in radial and decrease in axial and angular. When the number of balls increasing, nature frequencies increase and amplitudes decrease. When the pitch diameter increasing, axial nature frequency increase and others nearly keep no change. When outer race groove curvature radius increasing, nature frequencies increase in radial and decrease in axial and angular and amplitudes keep no change in radial and increase in axial and angular. When inner race groove curvature radius increasing, nature frequencies decrease and amplitudes increase.7. The distortion in amplitude and frequency components of bearing vibration signals picked up by the present probe measurement method is founded and right conclusions cannot be achieved by the signals. When accelerometer is rigidly screwed with steel stud onto a flat outer surface of a ball bearing, vibration signal can be got without distortion and the reliability of research on bearing vibration is assured.8. AR model is suitable for large samples of bearing vibration signals, square root of length of samples can be used as the upper limitation of order determination and the FPE order selection criterion is effective. Many advantages of AR spectrum are founded over the classical based on FFT.9. Time-Frequency analysis is necessary for abnormal noise of ball bearings. WPT overcomes the principle shortcomings of STFT and proved to be a best tool to process the abnormal signals.

理论分析和试验研究表明： 1球轴承振动是钢球—滚道接触副中的各种摩擦学作用引起的，具有摩擦动力学的本质，任何对接触副的摩擦学特性有影响的因素都将对球轴承的振动和噪声特性产生影响； 2中心轴向载荷作用下，载荷增大使球轴承的固有振动频率升高，载荷越大同样的载荷增幅引起的频率升幅减小，足够大的中心轴向载荷作用下载荷的变化对球轴承振动的频率特性不会产生明显的影响； 3轴向和径向联合载荷作用下，径向载荷不大时球轴承振动的固有频率基本不变，但是可能引起变刚度激励的非线性振动，出现新的频峰，过大的径向载荷将使部分钢球脱离接触，使球轴承的振动和噪声呈现不稳定状态； 4润滑对球轴承的振动和噪声特性有重要的影响，良好的润滑对振动有明显的抑制作用，润滑不充分时，振动和噪声的水平会有明显增高，一定条件下还会激发接触副中的谐振，发出啸声，造成接触表面的伤害，无润滑干接触时，短时的运转就会损伤接触副表面，使振动和噪声迅速增大，并随时可能引发严重的磨损和卡滞失效；接触副润滑良好时，油膜的"刚化效应"使球轴承振动的固有频率有所提高，润滑剂中含有弥散性污浊时，振动的幅度总体升高，但弥散性污浊不会改变球轴承振动的频率特性；浙江大学博士学位论文：球轴承振动的研究 5低速时，球轴承振动的基本特征呈现不稳定状态，随着转速的提高，球轴承振动的频率特性趋于稳定，固有频率频峰升高； 6理论分析表明，干接触时钢球和滚道表面波纹度的某些谐波分量能激励球轴承的振动，振动的幅值与谐波幅值成正比，实际球轴承中钢球的分布不可能完全均匀，波纹度的激励作用会随时发生；润滑接触的分析表明，波纹度的任意谐波分量均能激励球轴承的振动； 7球轴承的几何和结构参数分析表明，球轴承尺寸越大，径向、轴向和角振动的固有频率越低；钢球中心圆直径增大，球轴承的径向和轴向振动的固有频率基本不变，角振动的固有频率有所上升，振动的幅频特性基本不变；径向游隙加大使球轴承的径向振动固有频率降低，轴向和角振动的固有频率有所升高，径向振动幅频特性的幅值升高，而轴向和角向降低；钢球的数量增多使球轴承振动的固有频率上升，幅频特性的幅值下降，径向振动的幅值下降最为明显；外圈沟曲率半径系数增大使球轴承径向振动的固有频率升高，轴向和角振动的固有频率降低，径向幅频特性基本不变，轴向和角向幅频特性幅值升高；内圈沟曲率半径系数增大使径向、轴向和角振动固有频率均下降，振动幅频特性的幅值均有升高； 8试验对比表明，传感器采用探针式安装时，由于探针接触副接触特性的影响，钡(量得到的球轴承振动信号有失真，采用专门设计和制作的试验球轴承，以固定式安装加速度计，首次测量得到了球轴承振动的真实信号，通过对振动信号的分析，验证了球轴承振动的理论模型； 9)基于时间序列分析的AR模型适用于大样本球轴承振动信号的分析，以样本长度的均方根值作定阶上界，FPE做判阶准则，给出的AR谱光滑，频率分辨率高，是球轴承振动分析的简便而可靠的手段； 10以时频域分析的小波包变换分析球轴承异音信号能够比较好地定位和聚焦异音发生的时间，时间间隔，频率范围，同样是球轴承振动分析的可靠的手段，可用作球轴承故障诊断技术。

But the sun's rays then reach us despite having passed, first, through an enormous thickness of the higIT strata of the air, the minute dust of which reflects maximum of the higIT strata of the air, the minute dust of which reflects maximum of the blue rays away from us, leaving the complementary yellow light to pass on, Then, the somewhat coarser dust reflects the green rays, leaving a abundance orange-coloured light to pass on; and finally some of the yellow is reflected, leaving almaximum pure red.

这就充分呈现了低空尘埃的数量之大。但是太阳的光线终于到达了地面。它们先是穿过厚度极大的高空大气层，其中的细微尘埃把大部份蓝色的光反射掉了，让补色的黄光继续通行。然后，粗粒尘埃又反射掉绿色的光，让偏橙色的光继续通行。最后，部份黄色的光也反射掉，剩下几乎是纯红色的了。

Even more importantly, there will very likely be shortages of quality foods containing all of the necessary levels of active and absorbable vitamins and minerals of the necessary types, and in the right or proportional quantities, to allow for the human body to properly and adequately nourish itself.

更重要地，我们知道：一般的品质食物应该具有必要的活性等级、包含可吸收的维生素和必要类型的矿物质，并以适当或均衡的数量来供给人体正常和充分的滋养；但随着上述疾病的爆发，很有可能继而造成这类品质食物的短缺。

The author also presents the following phenomena which must have significant implications on the mental health of children in many countries in Asia . 1 Nuclearization of the family system and alarming increase of divorce, 2 Reduction of the number of children in a family, 3 Rising number of working mothers and women ? s equal right movement, 4 Lack of opportunity for parents to learn how to raise a child, 5 Steep competition and exclusive emphasis on scholastic achievement in school, 6 Marked changes in value orientations from traditional to modern ones, 7 Confusing and often contradictory advices by "experts" and "professionals" on child rearing and child education, 8 New tides of globalization and confounding co-existence of multi-cultures in most countries and emergences of virtual world, IT and BT industry in some advanced countries, resulting in new forms of psychopathology such as 'internet addiction' and extreme social isolation.Implications of these findings in terms of interventions and prevention for mental health children in developing countries are discussed in developmental, ecological and ethological points of view.

作者提出在大多数亚洲国家存在儿童抚养问题危机，主要依据以下观察：①避孕和意外怀孕②逃避和拒绝抚养，虐待儿童，遗弃幼童③不恰当的早期抚养④不恰当的/不够充分的教育，过度保护和过度控制⑤性别角色和态度改变⑥对智力发展拔苗助长以及学习成绩的压力作者还提出了以下几种现象，它们与亚洲国家的儿童精神健康有着密切关联：①家庭体系核心化和令人担忧的离婚率猛增②家庭成员中儿童数量的减少③职业妇女做母亲及妇女解放运动的兴起④父母亲抚养孩子经验不足⑤学校对学习成绩的过分强调合潜在的竞争压力⑥传统价值观在现代化的冲击中发生明显的变化⑦所谓&专家&和&权威人士&对孩子抚养和教育的观点众说纷纭⑧全球化新潮及多种文化共存的问题，虚拟世界的出现，发达国家 IT 、 BT 工业引发新型精神病理现象如&网络成瘾&和极端的社会隔绝根据这些发现，如何干涉和预防发展中国家的儿童精神健康问题，我们将从精神发育、生物学、行为学观点进行阐述。

Nuclearization of the family system and alarming increase of divorce, 2 Reduction of the number of children in a family, 3 Rising number of working mothers and womens equal right movement, 4 Lack of opportunity for parents to learn how to raise a child, 5 Steep competition and exclusive emphasis on scholastic achievement in school, 6 Marked changes in value orientations from traditional to modern ones, 7 Confusing and often contradictory advices by "experts" and "professionals" on child rearing and child education, 8 New tides of globalization and confounding co-existence of multi-cultures in most countries and emergences of virtual world, IT and BT industry in some advanced countries, resulting in new forms of psychopathology such as 'internet addiction' and extreme social isolation.Implications of these findings in terms of interventions and prevention for mental health children in developing countries are discussed in developmental, ecological and ethological points of view.

作者提出在大多数亚洲国家存在儿童抚养问题危机，主要依据以下观察：①避孕和意外怀孕②逃避和拒绝抚养，虐待儿童，遗弃幼童③不恰当的早期抚养④不恰当的/不够充分的教育，过度保护和过度控制⑤性别角色和态度改变⑥对智力发展拔苗助长以及学习成绩的压力作者还提出了以下几种现象，它们与亚洲国家的儿童精神健康有着密切关联：①家庭体系核心化和令人担忧的离婚率猛增②家庭成员中儿童数量的减少③职业妇女做母亲及妇女解放运动的兴起④父母亲抚养孩子经验不足⑤学校对学习成绩的过分强调合潜在的竞争压力⑥传统价值观在现代化的冲击中发生明显的变化⑦所谓&专家&和&权威人士&对孩子抚养和教育的观点众说纷纭⑧全球化新潮及多种文化共存的问题，虚拟世界的出现，发达国家IT、BT 工业引发新型精神病理现象如&网络成瘾&和极端的社会隔绝根据这些发现，如何干涉和预防发展中国家的儿童精神健康问题，我们将从精神发育、生物学、行为学观点进行阐述。

But programs set, time of course, amount of curriculum, teaching condition, and teaching form are still insufficient.4The reasons why other universities and colleges do not set elective physical education course are mainly due to leaders" consciousness, quantity and quality of physical education teachers, the field and equipment.5The reform and development of elective physical education course in universities and colleges should incarnate the guideline "health first. people oriented". Teaching content should be pertinent, scientific, arranged, and systematic, so as to build up a teaching content system combined theory, skills and abilities. Set programs on base of students" choice, at the same time, give attention to the requirement of social development and students" interest, and make differential treatment according to gender. The classroom teaching should be sportful, joyful, and successful. The organizing of course could be mutual choice, compensating service, both in and out classroom. The score could be graded synthetically assess knowledge, innovation, and effect.6Strengthening the management to elective physical education course, improving teachers" comprehensive quality, making full use of fields and stadiums are all supporting conditions for the development of elective physical education course.

但是开设的项目、开课的时间、教学时数、教学条件、教学组织形式还难以满足学生学习和掌握知识和技能的需要。4、未开设公共体育选修课的高校其主要原因与领导的认识程度、体育教师的数量和质量、体育场地器材等有关。5、高校公共体育选修课的改革发展应体现&健康第一、以人为本&的指导思想：教学内容突出针对性、科学性、层次性、系统性，构建理论、运动技能、能力培养相结合的内容结构体系；运动项目设置以大学生对体育的选择性为基本前提，同时兼顾社会发展的需要和学生兴趣的需要，注重性别差异与因材施教；教学方法力求教懂、教会，体现课堂教学的娱乐性、快乐感和成功的喜悦：教学组织实施双项选择、有偿服务、课内课外相结合等多种形式；学习成绩实施知识+创新+效果的综合考核评价方法。6、加强公共体育选修课动态管理，提高教师综合素质，挖掘现有体育场馆设施的潜力，充分提高利用率是公共体育选修课改革发展的基本保障条件。

In this paper,by the matrix method,a necessary and sufficient condition for two n-dimensional synclastic simplexes to be able embedded in the n-dimensional Euclidean space is obtained,as well as for two group finite point sets.

该文利用矩阵的方法，获得了两个同向的n维单形同时等距嵌入E~n维欧氏空间的一个充分必要条件是：对于预给(n+1)~2个距离，满足一组具有行列式形式的不等式组det，由此可以得到两组等数量的有限点集合到E~n维欧氏空间中等长嵌入的一个充分必要条件。

Failure of the organism to grow in the relevant medium invalidates that portion of the examination and necessitates a modification of the procedure by (1) an increase in the volume of diluent, the quantity of test material remaining the same, or by (2) the incorporation of a sufficient quantity of suitable inactivating agent in the diluents, or by (3) an appropriate combination of modifications (1) and (2) so as to permit growth of the inocula.

如该微生物不能在相关培养基中生长，则该试验所用的比例无效，并须对步骤进行如下修改：(1)增加稀释剂体积而供试品保持原数量；或者(2)加入充分数量的适当的灭活剂；或者(3)适当合并修改(1)和(2)，以便使接种体得以生长。

Now the Condition of the above-written Guarantee is such that if the Contractor shall duly perform and observe all the terms provisions conditions and stipulations of the said Contract on the Contractor's part to be performed and observed in accordance with the true purport intent and meaning thereof or if on default by the Contractor the Guarantor shall satisfy and discharge the damages sustained by the Employer thereby up to the amount of the above-written Guarantee then this obligation shall be null and void but otherwise shall be and remain in full force and effect but no alteration in terms of the said Contractor or in the extent or nature of the Works to be executed, completed and defects in the Works remedied thereunder and no allowance of time by the Employer of the Engineer under the said Contract nor any forbearance or forgiveness in or respect of any matter or thing concerning the said Contract of the part of the Employer or the said Engineer shall in any way release the Guarantor from any liability under the above-written Guarantee.

现在在之上书面保证的条件是这样如果承包商将执行和适当地将观察前述合同的所有期限供应条件和规定在承包商的零件执行和被观察与真实的主旨意向符合和意思因此或如果在缺省由承包商保人将满足和将释放损失由雇主遭受因此由相当数量在之上书面保证决定然后这义务将是除消并作废的但否则将是和将依然是在充分的力量和作用但没有改变根据前述承包商或在工作被执行，被完成和瑕疵的程度或本质在工作由工程师的雇主补救在其下和没有任一件问题或事容限时间根据前述合同亦不任一忍耐或饶恕或尊敬关于雇主或前述工程师的部份的前述合同在任何情况下发行将保人从任一个责任在在之上书面保证之下。

Entropic algorithms realizing automatic segmentation of chromosomes in one scene were proposed. These algorithms adequately consider properties of chromosome images, such as a large number of chromosomes in one scene, many broken pieces in one chromosome with bright and dark bands, etc.

文中提出了实现染色体的自动分割的熵分割算法，该算法充分考虑了每个视野中分割目标的数量大以及人类显带染色体被明暗交迭的带纹分割为若干不连续的片段等特点。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失