In mathematical finance, the CEV or constant elasticity of variance model is a stochastic volatility model, although technically it would be classed more precisely as a local volatility model, that attempts to capture stochastic volatility and the leverage effect.

Closed-eye hallucinations and closed-eye visualizations (CEV) are hallucinations that occur when one's eyes are closed or when one is in a darkened room. They should not be confused with phosphenes, perceived light and shapes when pressure is applied to the eye's retina, or some other non-visual external cause stimulates the eye.

CEV 是碳当量，由钢材中各 化学元素 的成分计算而成，有计算公式的，数值有规定也可供需双方根据需方钢材的使用情况与钢材制造厂家的规范协商而定。

CEV Cup SemiFinals: THY ISTANBUL vs. Igor Gorgonzola NOVARA I Match Highlights. Espinho, Portugal to welcome Beach Volley Nations Cup Final in mid-July! #EuroBeachVolleyU22 …

Closed-eye hallucinations and closed-eye visualizations (CEV) are a distinct class of hallucination. These types of hallucinations generally only occur when one's eyes are closed or when one is in a darkened room. They should not be confused with phosphenes, perceived light and shapes when pressure is applied to the eye.

碳当量表示法有：CEV，CE，CET，Ceq CE IIW C IIW，PCM等。 碳当量是用来衡量材料焊接时冷裂纹（氢致裂纹）发生程度（概率）的一种理论计算数值。 值越大，发生冷裂纹（氢致裂纹）的程度（概率）就越高。 反之就越低。 1.钢的碳当量一般表示为CEV，CEV其实是Carbon Equivalent Value首字母的缩写。 CEV与CE IIW公式一致。 如果熔炼分析显示硼的含量低于0.001％，那么不要求对硼元素测定进行产品分析且在碳当量计算中可认为其值为零。 在标 …

Two flight test campaigns involving a SA 365 N Dauphin 2 helicopter of the French Flight Test Center (CEV) have been carried out and have provided ex- tensive aerodynamic and acoustic databases.

The Crew Exploration Vehicle (CEV) was a component of the U.S. NASA Vision for Space Exploration plan. A competition was held to design a spacecraft that could carry humans to the destinations envisioned by the plan. The winning design was the Orion spacecraft.

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2022年11月19日 · Closed-eye hallucinations and closed-eye visualizations (CEV) are a distinct class of hallucination. These types of hallucinations generally only occur when one’s eyes are closed or when one is in a darkened room. They can be a form of phosphene. Some people report closed-eye hallucinations under the influence of psychedelics.