英国利物浦大学人体医学Assignment代写:人类能跑多快?

人类跑得多快?今天在我们这个星球上最快的人是牙买加运动员乌塞恩博尔特,他在2008年北京夏季奥运会上以9.58秒的世界纪录跑了100米冲刺,这个速度大约是每小时37.6公里或者每小时23.4英里。小时。在短距离冲刺期间,博尔特达到惊人的12.3米/秒(27.51英里/小时或44.28公里/小时)和27.51英里/小时(44.28公里/小时)。作为一项身体活动,跑步在质量上与步行不同。在跑步时,一个人的腿弯曲,肌肉被强行拉伸,然后在加速期间收缩。随着身体中心质量的变化,人体内可能存在的重力能和动能变化。这被认为是因为肌肉中能量的交替释放和吸收。学者们认为,跑得最快的精英短跑运动员是那些经济运行的运动员,这意味着他们每单位距离运动使用的能量很少。这样做的能力受肌纤维分布,年龄,性别和其他人体测量因素的影响 - 精英跑者中最快的是年轻男性。跑步者可能的速度也受到生物力学变量的影响,有些争议归因于跑步者的步态周期。影响人的速度的因素是较短的地面接触时间,较低的步幅频率,较长的摆动时间,较大的步幅角和较长的步幅。特别是,冲刺跑步者通过应用更大的质量特定地面力,特别是水平踝速度,接触时间和步速,最大化其加速度和最大冲刺速度。 英国利物浦大学人体医学Assignment代写:人类能跑多快? How fast can humans run? The fastest person clocked on our planet today is the Jamaican athlete Usain Bolt, who ran the 100 meter sprint at the 2008 Summer Olympics in Beijing in a world record of 9.58 seconds, which works out to be about 37.6 kilometers per hour or 23.4 miles per hour. For a brief period during that sprint, Bolt reached an astounding 12.3 meters per second (27.51 mph or 44.28 kph).nd (27.51 mph or 44.28 kph). As a physical activity, running is qualitatively different from walking. In running, a person's legs flex and the muscles are forcibly stretched and then contracted during acceleration. The potential gravitational energy and the kinetic energy available in a person's body changes as the center of mass in the body changes. That is thought to be because of the alternating release and absorption of energy in the muscles. Scholars believe that the fastest runners, the elite sprinters, are those who...
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英国基尔大学生物学Essay代写:狗智力和情感

我们喂他们,我们让他们睡在我们的床上,我们和他们一起玩,我们甚至和他们说话。当然,我们爱他们。任何狗主人都会告诉你,他们的宠物有非凡的能力去理解周围的世界。他们是对的。科学家已经找到了很好的方法来找出人类最好的朋友的能力。在过去几年中,人类对小狗认知的理解中最大的进步之一就是使用MRI机器扫描狗脑。 MRI代表磁共振成像,这是一个持续描绘大脑的哪些部分通过什么外部刺激照亮的过程。正如任何小狗的父母所知,狗是高度可训练的。这种可训练的性质使得狗成为MRI机器的理想选择,不像鸟类或熊类等非驯养的野生动物。专门研究狗的认知,充分利用某种类型的MRI机器,fMRI(代表功能性MRI)来研究这些动物。这些机器检测血流量的变化,并用它来测量大脑活动。通过不断的研究,McGowan已经发现了很多关于动物认知和感受的知识。在2015年进行的一项研究中,McGowan发现人的存在导致狗的眼睛,耳朵和爪子的血流量增加,这意味着狗很兴奋。 McGowan还研究了狗被宠物时会发生什么。我们早就知道,对于人类来说,抚摸心爱的动物可以降低压力和焦虑的速度。嗯,事实证明狗也是如此。当人类宠物庇护狗15分钟或更长时间时,狗的心率会降低,整体而言会变得不那么焦虑。最近关于狗认知的另一项研究发现,我们心爱的伴侣动物可以分辨出我们情绪表达的差异。在使用fMRI机器进行的另一项研究中,科学家们发现,不仅狗可以区分快乐和悲伤的人脸,他们对这些人的反应也不同。 英国基尔大学生物学Essay代写:狗智力和情感 We feed them, we let them sleep in our beds, we play with them, we even talk to them. And of course, we love them. Any dog-owner will tell you that their pet has a remarkable capacity to understand the world around them. And they’re right. Scientists have figured out great ways to find out exactly what human’s best friend is capable of. Over the past several years, one of the biggest advances in our human understanding of doggie cognition has been the use of MRI machines to scan dog brains. MRI stands for magnetic resonance imaging, the process of taking an ongoing picture of what parts of the brain are lighting up through what external stimuli. Dogs, as any doggie parent knows, are highly trainable. This trainable nature makes dogs great candidates for MRI machines, unlike non-domesticated wild animals like birds or bears. Specializing in dog cognition, takes full advantage of a certain type of MRI machine,...
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英国思克莱德大学物理学Essay代写:蝙蝠回声定位如何工作

回声定位是形态学(物理特征)和声纳(SOund NAvigation和Ranging)的结合使用,允许蝙蝠使用声音“看到”。蝙蝠使用它的喉部产生通过其嘴或鼻子发出的超声波。有些蝙蝠也会用舌头产生咔哒声。蝙蝠听到返回的回声,并比较信号发送和返回之间的时间以及声音频率的变化,以形成其周围环境的地图。虽然没有蝙蝠完全失明,但动物可以在绝对黑暗中使用声音来“看”。蝙蝠耳朵的敏感性使其能够通过被动聆听来寻找猎物。蝙蝠耳脊充当声学菲涅耳透镜,允许蝙蝠听到地栖昆虫的运动和昆虫翅膀的颤动。一些蝙蝠的身体适应是可见的。皱巴巴的肉质鼻子充当扩音器以投射声音。蝙蝠外耳的复杂形状,褶皱和皱纹有助于接收和漏斗传入的声音。一些关键的改编是内部的。耳朵包含许多接收器,允许蝙蝠检测微小的频率变化。蝙蝠的大脑映射信号,甚至可以解释飞行对回声定位的多普勒效应。就在蝙蝠发出声音之前,内耳的微小骨头分开以降低动物的听觉敏感度,因此它不会自我震耳欲聋。一旦喉部肌肉收缩,中耳放松,耳朵可以接收回声。 英国思克莱德大学物理学Essay代写:蝙蝠回声定位如何工作 Echolocation is the combined use of morphology (physical features) and sonar (SOund NAvigation and Ranging) that allows bats to "see" using sound. A bat uses its larynx to produce ultrasonic waves that are emitted through its mouth or nose. Some bats also produce clicks using their tongues. The bat hears the echoes that are returned and compares the time between when the signal was sent and returned and the shift in the frequency of the sound to form a map of its surroundings. While no bat is completely blind, the animal can use sound to "see" in absolute darkness. The sensitive nature of a bat's ears enables it to find prey by passive listening, too. Bat ear ridges act as an acoustic Fresnel lens, allowing a bat to hear the movement of ground-dwelling insects and the flutter of insect wings. Some of a bat's physical adaptations are visible. A wrinkled fleshy nose acts as a megaphone to project sound....
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英国赫瑞瓦特大学社会学Essay代写:宗教组织领导

David Koresh(1959年8月17日 - 1993年4月19日)是一个宗教派别的魅力领袖,被称为大卫教派。在德克萨斯州韦科与酒精,烟草和火器局(ATF)的致命对峙中,科雷什及其80多名追随者被杀。 David Koresh(出生于Vernon Wayne Howell)出生于德克萨斯州,是一位十四岁的母亲。他从不认识他的父亲,她在分娩前与母亲分手。年轻的Koresh Howell的母亲后来搬进了一个暴力和虐待的男人。当Koresh四岁时,他被外祖母送去抚养,但当他七岁时,他的母亲结婚了,他又回去和她和她的新丈夫住在一起。然而,他仍然定期与他的祖母一起参加宗教仪式,他的祖母将他带到她的基督复临安息日教会。在青少年时期,Koresh与阅读障碍斗争,并被安排在特殊教育班。他被认为是尴尬和不受欢迎的。他在高中毕业前辍学,二十出头,他犯了法定强奸罪,导致一名15岁女孩怀孕。在追捕牧师的十几岁的女儿并说上帝命令他嫁给她之后,他后来被赶出了他母亲的福音派教会。到了八十年代初,他搬到了韦科,在那里他加入了大卫山分行的卡梅尔山中心。在一年左右的时间里,Koresh声称拥有预言的天赋。 英国赫瑞瓦特大学社会学Essay代写:宗教组织领导 David Koresh (August 17, 1959–April 19, 1993) was the charismatic leader of a religious sect known as the Branch Davidians. During a deadly standoff in Waco, Texas with the Bureau of Alcohol, Tobacco, and Firearms (ATF), Koresh and more than 80 of his followers were killed. David Koresh (born Vernon Wayne Howell) was born in Texas to a fourteen-year-old mother. He never knew his father, who broke up with his mother before she gave birth. The young Koresh Howell's mother later moved in with a violent and abusive man. When Koresh was four years old, he was sent to be raised by his maternal grandmother, but when he was seven, his mother got married and he went back to live with her and her new husband. However, he still attended religious services regularly with his grandmother, who took him to her Seventh Day Adventist church. As a teenager, Koresh struggled with dyslexia...
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英国牛津大学文学Essay代写: 如何更好地理解莎士比亚

对许多人来说,语言是理解莎士比亚的最大障碍。当他们看到像“Methinks”和“Peradventure”这样奇怪的词语时,完全胜任的表演者会因恐惧而瘫痪 - 我们称之为Shakespearaphobia。作为一种试图抵制这种自然焦虑的方法,我们通常首先告诉新学生或表演者大声说莎士比亚并不像学习一种新语言 - 更像是聆听强烈的口音,你的耳朵很快会适应新的方言。很快你就能理解所说的大部分内容。即使您对某些单词和短语感到困惑,您仍然可以从上下文中获取含义以及从发言者处收到的视觉信号。观看儿童在度假时如何快速获得口音和新语言。这证明了我们对新的说话方式的适应能力。莎士比亚也是如此,莎士比亚恐惧症最好的解药是坐下来,放松,听取所说的文字和表演。以下是十大最常见的莎士比亚单词和短语的现代翻译。 Thee,Thou,Thy and Thine(你和你)莎士比亚从不使用“你”和“你的”这个词是一个普遍的神话 - 实际上,这些词在他的戏剧中是司空见惯的。然而,他也用“你/你”代替“你”和“你/你的”这个词而不是“你的”。有时他会在同一个演讲中同时使用“你”和“你的”。这只是因为在英国都铎王朝,老一辈说“你”和“你的”表示对权威的地位或崇敬。因此,在向国王发表讲话时,会使用较旧的“你”和“你的”,将较新的“你”和“你的”留给非正式场合。莎士比亚一生后不久,旧形式过世了! 英国牛津大学文学Essay代写: 如何更好地理解莎士比亚 For many, language is the biggest barrier to understanding Shakespeare. Perfectly competent performers can be paralyzed with fear when they see bizarre words like “Methinks” and “Peradventure” – something we call Shakespearaphobia. As a way of trying to counter this natural anxiety, we often begin by telling new students or performers that speaking Shakespeare aloud isn’t like learning a new language –it’s more like listening to a strong accent and your ear soon adjusts to the new dialect. Very soon you are able to understand most of what is said. Even if you are confused about some words and phrases, you should still be able to pick up meaning from the context and the visual signals you receive from the speaker. Watch how quickly children pick up accents and new language when on holiday. This is evidence of how adaptable we are to new ways of speaking. The same is...
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英国诺丁汉特伦特大学Essay代写:科学中的标准定义和例子

在计量学和其他科学中,例如化学和物理学,标准是用于校准测量的参考。从历史上看,每个机构都为衡量和衡量系统定义了自己的标准。这导致了混乱。虽然一些较旧的系统仍在使用,但现代标准在国际上得到认可并在受控条件下进行了定义。例如,在化学中,可以使用主要标准作为试剂来比较滴定或其他分析技术中的纯度和数量。在计量学中,标准是定义物理量单位的对象或实验。标准的示例包括国际原型公斤(IPK),其是国际单位制(SI)的质量标准,以及伏特,其是电势的单位并且基于约瑟夫森结的输出来定义。物理测量有不同级别的标准。主标准或主要标准是最高质量标准,它们定义了它们的计量单位。层次结构中的下一级标准是次级标准,其参考主要标准进行校准。层次结构的第三层包含工作标准。工作标准定期从二级标准校准。还有实验室标准,由国家组织定义,用于认证和校准实验室和教育设施。由于实验室标准被用作参考并且符合质量标准,因此它们有时(不正确地)被称为二级标准。但是,该术语具有特定和不同的含义。 英国诺丁汉特伦特大学Essay代写:科学中的标准定义和例子 In metrology and other sciences, such as chemistry and physics, a standard is a reference that is used to calibrate measurements. Historically, each authority defined its own standards for systems of weights and measures. This resulted in confusion. Although some of the older systems are still in use, modern standards are internationally recognized and defined under controlled conditions. In chemistry, for example, a primary standard may be used as a reagent to compare purity and quantity in a titration or other analytical technique. In metrology, a standard is an object or experiment that defines the unit of a physical quantity. Examples of standards include the international prototype kilogram (IPK), which is the mass standard for the International System of Units (SI), and the volt, which is the unit of electrical potential and is defined based on the output of a Josephson junction. There are different levels of standards for physical measurements. The master standards or primary standards are those of...
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英国布里斯托大学Assignment代写:伦敦分散力定义

伦敦分散力是彼此接近的两个原子或分子之间的弱分子间力。力是两个原子或分子彼此接近时电子云之间的电子排斥所产生的量子力。伦敦分散力是范德瓦尔斯力中最弱的,是当温度降低时导致非极性原子或分子凝结成液体或固体的力。即使它很弱,在三种范德华力(取向,归纳,分散)中,分散力通常占主导地位。例外是小的,易于极化的分子(例如水)。力量得名,因为Fritz London首先解释了1930年贵族气体原子如何相互吸引。他的解释是基于二阶扰动理论。又称:伦敦力,LDF,弥散力,瞬时偶极力,诱导偶极力。伦敦分散力有时可以被宽泛地称为范德瓦尔斯力。当你想到原子周围的电子时,你可能想象出微小的移动点,在原子核周围均匀分布。然而,电子总是处于运动状态,有时原子的一侧比另一侧的电子多。这发生在任何原子周围,但它在化合物中更为明显,因为电子感受到相邻原子质子的吸引力。可以布置来自两个原子的电子,使得它们产生临时(瞬时)电偶极子。即使极化是暂时的,它也足以影响原子和分子相互作用的方式。 英国布里斯托大学Assignment代写:伦敦分散力定义 London dispersion force is a weak intermolecular force between two atoms or molecules in close proximity to each other. The force is a quantum force generated by electron repulsion between the electron clouds of two atoms or molecules as they approach each other. The London dispersion force is the weakest of the van der Waals forces and is the force that causes nonpolar atoms or molecules to condense into liquids or solids as temperature is lowered. Even though it is weak, of the three van der Waals forces (orientation, induction, dispersion), the dispersion forces are usually dominant. The exception is for small, readily polarized molecules (e.g., water). The force gets its name because Fritz London first explained how noble gas atoms could be attracted to each other in 1930. His explanation was based on second-order perturbation theory. Also Known As: London forces, LDF, dispersion forces, instantaneous dipole forces, induced dipole forces. London dispersion forces may sometimes be loosely referred...
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英国伦敦国王学院物理学Essay代写:力量定义和例子

在科学中,力是对物体的推动或拉动,其质量可以使其改变其速度(加速)。力是一个向量,这意味着它既有大小又有方向。在方程和图中,力通常用符号F表示。例如牛顿第二定律中的着名方程:F = m·a其中F是力,m是质量,a是加速度。 SI单位的力是牛顿(N)。其他力量单位包括达因,千克力(千克力),poundal和磅力。虽然亚里士多德和阿基米德了解了力量是什么以及它们是如何起作用的,但伽利略·伽利莱和艾萨克·牛顿爵士描述了力量在数学上是如何运作的。牛顿运动定律(1687)预测了正常情况下力的作用。爱因斯坦的理论相对预测了力量的作用,因为动量接近光速。在本质上,基本力是重力,弱核力,强核力,电磁力和残余力。强力是将原子核中的质子和中子结合在一起的力量。电磁力负责相反电荷的吸引,类似电荷的排斥和磁铁的拉动。在日常生活中也遇到了非基本的力量。法向力作用于与物体之间的表面相互作用垂直的方向。摩擦力是一种抵抗表面运动的力量。非基本力的其他示例包括弹力,张力和与框架相关的力,例如离心力和科里奥利力。 英国伦敦国王学院物理学Essay代写:力量定义和例子 In science, force is a push or a pull on an object with mass that can cause it to change its velocity (to accelerate). A force is a vector, which means it has both magnitude and direction. In equations and diagrams, a force is usually denoted by the symbol F. An example is the famous equation from Newton's second law: F = m·a where F is force, m is mass, and a is acceleration. The SI unit of force is the Newton (N). Other units of force include the dyne, kilogram-force (kilopond), poundal, and pound-force. While Aristotle and Archimedes had a sense of what forces were and how they worked, Galileo Galilei and Sir Isaac Newton described how force works mathematically. Newton's laws of motion (1687) predict the action of forces under normal conditions. Einstein's theory of relatively predicts the action of forces as momentum approaches the speed of light. In nature, the fundamental forces are gravity,...
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英国曼彻斯特大学Essay代写:电能定义和实例

电能是由电荷流动产生的一种能量形式。能量是指工作或用力移动物体的能力。在电能的情况下,力是带电粒子之间的电吸引或排斥。电能可以是势能或动能,但它通常作为势能遇到,其是由于带电粒子或电场的相对位置而存储的能量。带电粒子通过导线或其他介质的运动称为电流或电流。还存在静电,其由物体上的正电荷和负电荷的不平衡或分离引起。静电是一种电势能。如果积聚足够的电荷,则可以释放电能以形成具有电动能的火花(或甚至闪电)。按照惯例,电场的方向始终显示为指向正粒子放置在场中时将移动的方向。在处理电能时,这一点很重要,因为最常见的电流载流子是电子,与质子相比,它在相反的方向上移动。 英国曼彻斯特大学Essay代写:电能定义和实例 Electrical energy is a form of energy resulting from the flow of electric charge. Energy is the ability to do work or apply force to move an object. In the case of electrical energy, the force is electrical attraction or repulsion between charged particles. Electrical energy may be either potential energy or kinetic energy, but it's usually encountered as potential energy, which is energy stored due to the relative positions of charged particles or electric fields. The movement of charged particles through a wire or other medium is called current or electricity. There is also static electricity, which results from an imbalance or separation of the positive and negative charges on an object. Static electricity is a form of electrical potential energy. If sufficient charge builds up, the electrical energy may be discharged to form a spark (or even lightning), which has electrical kinetic energy. By convention, the direction of an electric field is always shown pointing in the direction...
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新加坡南洋理工大学化学Assignment代写:放热反应实例尝试的示范

没有流行的大象牙膏反应,没有放热反应列表是完整的。这种化学反应的热量伴随着泡沫的喷泉。演示的经典形式使用过氧化氢溶液,碘化钾和洗涤剂。还有一种儿童友好型的反应,使用酵母和家用过氧化物,足够安全,可以让年轻人触摸。铝热反应很像用醋生锈钢丝,除了金属的氧化发生得更加剧烈。尝试铝热反应是你想要燃烧金属和大量的热量。如果你相信“变大或回家”,那么试着在干冰块内进行铝热反应。这放大了过程,甚至可能产生爆炸。如果燃烧的金属是你的一杯茶,只要将任何碱金属滴入水中就不会出错(除非你添加太多)。锂,钠,钾,铷和铯都在水中反应。当您在元素周期表中向下移动时,反应的能量会增加。锂和钠使用起来相当安全。如果您尝试使用含钾的项目,请务必小心。最好将铷或铯在水中的放热反应留给想要在YouTube上出名的人。如果那就是你,给我一个链接,我会展示你冒险的行为。 新加坡南洋理工大学化学Assignment代写:放热反应实例尝试的示范 No list of exothermic reactions would be complete without the popular elephant toothpaste reaction. The heat of this chemical reaction is accompanied by a fountain of foam. The classic form of the demonstration uses a hydrogen peroxide solution, potassium iodide, and detergent. There is also a kid-friendly version of the reaction that uses yeast and household peroxide and is safe enough for young hands to touch. The thermite reaction is much like rusting steel wool with vinegar, except the oxidation of metal occurs much more vigorously. Try the thermite reaction is you want burning metal and a lot of heat. If you believe "go big or go home", then try performing the thermite reaction inside a block of dry ice. This amplifies the process and may even produce an explosion. If burning metals is your cup of tea, you can't go wrong with simply dropping any alkali metal in water (unless you add too much). Lithium, sodium, potassium, rubidium, and...
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