分类
交易心理学

CFD (差价合约) 是什么?

US-TECH 100 NQ

US-TECH100 Futures CFD, based on the CFD (差价合约) 是什么? NASDAQ-100 index futures, which consists of 100 leading NASDAQ-listed shares. Bloomberg

Why Plus500?

Authorised and Regulated

Negative Balance Protection

24/7 Online Support

Traders' Sentiments

US-TECH100 Futures CFD, based on the NASDAQ-100 index futures, which consists of 100 leading NASDAQ-listed shares. Bloomberg

Spread 1.9 Spread (%) 0.01%
Overnight funding - Buy -0.018% Overnight funding - Sell -0.0094%
Initial margin 0.67% Maintenance margin 0.33%
Leverage 1:150 Expires daily No
Futures Contract September 2022
Automatic rollover

Related Instruments

Name Sell Sell button / Change Buy Change Change Change Change Change Change
> > Sell Buy > Trade

Upcoming Events

Learn More About Trading

What is the Nasdaq 100?
What Moves CFD (差价合约) 是什么? the NASDAQ?
How to Trade on the Nasdaq 100 Movements
History of the Nasdaq 100

Plus500 News & Market Insights

Here’s What You Need to Know About Inflation

Here’s What You Need to Know About Inflation

Inflation has become a major factor affecting trading outcomes across the world and leading to shifts in monetary policy. How CFD (差价合约) 是什么? does inflation come to be and which sectors are most influenced by it?

The Potential Fallout of an American Default

The Potential Fallout of an CFD (差价合约) 是什么? American Default

U.S. stock benchmarks have been selling off ahead of October, historically the most volatile month, as the deadline for American lawmakers to raise the debt ceiling nears. What is at stake?

Is the NASDAQ-100 Headed Into a Correction?

Is the NASDAQ-100 Headed Into a Correction?

Apple and Facebook led the NASDAQ-100 in its biggest slide in two weeks amid concerns over an economic slowdown, following Friday's underwhelming August payrolls data and signals of the Fed's tapering.

Why Plus500?

Authorised and Regulated

Negative Balance Protection

24/7 CFD (差价合约) 是什么? Online Support

How is the US-TECH 100 stock market index calculated?

US-TECH 100 index futures CFD, based on NASDAQ-100 index futures, is a basket of shares including the 100 largest non-financial companies listed on the NASDAQ stock market. The index is traded as ‘NQ’.

NASDAQ-100 is a modified capitalisation-weighted index, as a result, larger companies like Apple, Microsoft, Meta and Intel - have a greater effect on the index’s price than smaller companies.

What are the factors that move the Nasdaq 100 stock index?

The price of US-TECH 100 futures contract is impacted by a wide range of factors.

Among these are the economic outlook for the US economy, including the percent change in gross domestic product (GDP), measuring the nation's production output; changes in government revenues; and interest, inflation, employment and unemployment rates. Furthermore, macroeconomic events and changes in trade agreements, at both regional and global levels, can tend to move American-based stock index futures.

What are the major indices in the US Stock Market and their opening and closing times?

On the American stock market are 4 of the most actively-traded index futures:

These index futures are available for trading from Sunday 22:00 until Friday 20:15, with an interval downtime of 15 minutes CFD (差价合约) 是什么? between 20:15 to 20:30, as well as 1 hour from 21:00 to 22:00*.

* Trading hours are in UTC and may change occasionally CFD (差价合约) 是什么? CFD (差价合约) 是什么? depending on the underlying stock exchanges.

How do I start trading US-TECH 100?

Here are five steps to start trading US-TECH 100 index futures CFD with Plus500:

icoFoam解析

方程(1)和(2)为宏观方程,调用了宏观假定,其起源为玻尔兹曼方程(又名动理学方程)。在更底层的介尺度研究领域,方程(1)和(2)也即从介尺度模型演化的宏观二阶矩模型。在无压力无粘性的条件下具备弱双曲特征。由于失去了高阶矩的统计学特征,因此方程(1)和(2)在某些情况下是不适用的;在考虑适当的简化情况下,方程(1)和(2)可被称之为Navier-Stokes (N-S) 方程。除了上述数学特征,求解N-S方程可分为不同的方法如有限体积法、有限差分法以及谱方法等。有限体积法得益于其天然守恒的数学特征,被大量的植入于CFD软件中用于流体动力学计算模拟。

控制方程与算法

首先对方程(2)中的时间项进行对速度 \(\bfU\) 关于时间 \(t\) 的欧拉全隐离散有 :

(6) \[ \int \int \nabla p \mathrmV\mathrmt=\int\int p \mathrm\bfS\mathrmt=\Delta t\sum \left(p_f^t\bfS_f\right), \]

其中上标 \(^t\) 表示为当前的时间步(已知),上标 \(^*\) 表示预测步(待求),下标 \(_f\) 表示网格单元面上的值, \(V_\rP\) 表示网格单元体积, \(\bfS_f\) 表示网格单元的各个面的面矢量, \(\Delta t\) 表示时间步长, \(F_f^t\) 为通量, \(\nu\) 为动力粘度。方程(5)中 \((\nabla\mathbf^*)_f\cdot\bfS_f \) 需要进一步处理,其中 \(\nabla\mathbf^*\) 为定义在体心的量,即网格体心的速度梯度。 \((\nabla\mathbf^*)_f\) 为定义在面心的量,即网格面心的速度梯度。

需要注意的是,方程(2)中的左边第二项(对流项)是非线性的。在求解的过程中,要么选择非线性求解器,要么将对流项线性化。由于非线性求解器非常复杂,因此在OpenFOAM均采用线性化处理。具体的,在对方程(7)中的左边第二项对流项离散中,其中的通量 \(F_f^t\) 采用当前已知时间步的速度 \(\mathbf^t\) 来计算,同时保留 \(\mathbf^*_\mathrm\) 为未知量。这种将高阶非线性项降为一阶线性项的过程即为线性化操作。线性化的一个问题即为通量速度的信息有所滞后。

方程(7)中 \(\mathbf_f^*\) 被定义为面上的预测速度。面速度需要从体心速度进行插值来获得,在此步可以引入各种插值格式。假设在均一网格上使用中心线性格式:

同时,为使用紧致基架点防止数值震荡, \((\nabla\mathbf^*)_f\cdot\bfS_f\) 通常表示为面法向梯度与面矢量的模的乘积:

(10) \[ (\nabla\mathbf^*)_f \cdot\mathbf_f= \left((\nabla\mathbf^*)_f\cdot\frac<\mathbf_f><|\mathbf_f|> \right ) \cdot|\mathbf_f| \]

其中 \(\mathbf\) 表示网格单元体心之间矢量差(距离矢量),下标 \(_\mathrm\) 表示相邻网格单元的速度,下标 \(_\mathrm\) 表示当前网格单元的速度。速度的面法向梯度在三维情况下为一个矢量(变量的面法向梯度与变量的阶数相同)。在这里需要注意的是,方程(11)只对矩形网格精准,网格非正交性增加,需要特定的数值处理提高其计算精准性。

紧致基架点与拓展基架点的英文被称之为compact stencil与extended stencil,有关基架点的详细描述可参考无痛苦NS方程笔记中有关 laplacian(ϕ) = div(grad(ϕ))? 的讨论。

十大CFD软件盘点,要成为业界技术大咖必会3种!

PHOENICS是 Parabolic Hyperbolic Or Elliptic Numerical Integration Code Series 几个字母的缩写,这意味着只要有流动和传热都可以使用PHOENICS来模拟计算,是世界上第一套计算流体与计算传热学商业软件。如今,PHO ENICS已经发展成为 一款能够模拟传热、流动、反应、燃烧过程的通用CFD软件,广泛应用于 能源动力、两相、多相流、航空航天、传热传质、化工 燃烧、爆炸、船舶水利、化学反应、建筑、暖通空调、流体机械、冶金、磁流体、环境、材料等领域

近五年来,NUMECA国际公司已经成功地在国际CFD 市场,特别是在叶轮机械领域,掀起了强劲的NUMECA 旋风,使国际上各主要叶轮机械厂家(如:Garrett, Sulzer Turbo, ABB Turbo, Thermodyn (GE), MAN, KBB,Shin Nippon Machinery, ALSTOM Power, Honda and SOLAR TurbinesFor aero &rocket engines, Snecma, Honeywell, Rolls-Royce, KHI, Fiat Avio, Pratt&Whitney,Aerodisa, Japan Defence Agency)都开始大量使用NUMECA软件,使得NUMECA的用户一直快速稳步地增长。

CFD (差价合约) 是什么?

Examples and Help

Pinyin words should be entered without spaces, either with or without tone numbers: ni3hao3 or nihao. The character ü can be entered as v instead.

rest* will match any word starting with rest, such as restaurant or restrain
*文 will match any word ending with , such as 中文 or 英文
b*g will match any word starting with b and ending with g, such as big or boring
*中国* will match any word containing 中国, such as 传统中国医药 or 中国人民

To match only Chinese characters, Mandarin pinyin or English definition, use: c:chinese p:pinyin e:english:

'-', 'c:', 'p:' and 'e:' only influence the search term immediately after these prefixes. When used CFD (差价合约) 是什么? with groups, they influence the whole group they prefix.