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01:18Boundary Layer Characteristics
When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
01:03Precipitation Gravimetry
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
02:16Light Acquisition
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
01:12Precipitation Processes
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
01:26Influence of Earth's Curvature and Atmospheric Refraction on Leveling
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
01:16Flame Photometry: Lab
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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まとめ
光検出と距離測定 (LIDAR) は,レーザーパルスを使用して大気中の小さな粒子を検出し,レーダーに光学的な代替案を提供します. この技術は,反射光を分析して,高感度で大気組成と範囲を測定します.
科学分野:
- 大気光学とリモートセンシング.
- 光学物理学と計測. 光学物理学と計測. 光学物理学と計測. 光学物理学と計測. 光学物理学と計測.
背景:
- Lidar,または光検出と距離測定は,気象レーダーの光学アナログとして機能します.
- 光学波長は,レーダーで使用されるマイクロ波波長と比較して,大気中の粒子がかなり小さいことを検出することができます.
研究 の 目的:
- LIDAR技術の基本的原理と機器について説明する.
- Lidarの微細大気粒子の検出能力を強調するために.
主な方法:
- レーザーを電源として利用し,レンズシステムを通じて濃い単色光の短いパルスを発する.
- トランスミッターと協調した望遠鏡を用いて,反射した大気の光を集めます.
- 狭路フィルターと光増倍器は,反射光を検出し,送信周波数を隔離します.
主要な成果:
- 光学波長操作により,非常に小さな大気粒子を検出するLidarの能力を実証しています.
- データの可視化は,振動器を使用して達成され,範囲 (A-scope) に対して信号の強度を表示します.
結論:
- Lidarは,微細粒子を検出することによって,大気プロファイリングのための敏感な方法を提供します.
