Radiation generated by the passage of a monoenergetic electron bunch above the surface wave excited in plane interface between homogeneous media with different dielectric constants is investigated. For the surface wave of general profile the radiation intensity is expressed via the radiated power from a...
Have you ever seen the auroras (极光) in the sky?(你知道宇宙辐射吗?你见过天空中的极光吗?)可知,作者以提出问题开始这篇文章。故选A。(2)段落大意题。根据文中第2段:A 53-year-old flight attendant (空中乘务员) in South Korea,who spent about 1,022 hours flying each year,passed away due ...
根据“A flight attendant in the R. O. K. , who spent over 1,000 hours flying each year for about 25 years, passed away due to cancer. "可知,宇宙辐 射影响身体健康,故宇宙辐射是危险的。 3. B 细节理解题。 根据“The earth's magnetic field and atmosphere protect us from most cosmic ...
Here we conclude that the dose reduction originated from the rotation of bulkier parts of Orion into the proton plane (Fig. 3d). This shows that preferential spacecraft orientations, in which the thickest shielding is placed into the path of incoming radiation, have the potential for large ...
Orion's orientation during flight affected radiation exposure, which dropped by half when the spacecraft made a 90-degree turn flying past the inner Van Allen belt. "This is because the Van Allen belt radiation is quite directional, and the flip put more shielding into the ...
attributes of the target. In the pitch detection plane, the total infrared radiation intensity of the aircraft exhibits a “8” distribution, with the fuselage contributing the most (approximately 50%). In the yaw plane, the vertical stabilizer’s infrared radiation intensity shows a lobed distribu...
Cosmic radiation creates these pretty lights in the North and South Pole areas. It seems that cosmic radiation is a beautiful gift from space. But for some people, it can be dangerous. A 53-year-old flight attendant(空中乘务员) in South Korea, who spent about 1,022 hours flying each ...
In dense PDRs, the gas densities can range from 103cm−3 to 107cm−3, with UV intensities G0 from a few units to the order of 106 (Hollenbach and Tielens, 1999). The UV field intensities impinging on dense PDRs seem to be correlated to the gas density of the dense structures (...
I’m heading off on vacation tomorrow and, since that entails flying from Virginia to Seattle, I thought it would be timely to publish this post! When it comes to travel, I wouldn’t call myself paranoid. I would call myself a prepared researcher. ...
The OC sounding rocket (James and Calvert, 1998) was launched at the Poker Flat Research Range in central Alaska on 7 November 1995. Starting at about 1.8 min after apogee, experiments on plane-wave propagation were carried out between the two free-flying halves (subpayloads) of the double...