阿摩線上測驗 登入

最新科目

最新試卷

最新試題

最新申論題

四、請針對以下火羽在溫度層化環境下(Plumes in Temperature - StratifiedAmbients)的描述,解讀附圖的物理現象。火災科學 1原文:When a buoyant, turbulent plume rises, it cools by entrainment ofambient air. If the ambient air increases in temperature with height, which isnormal in buildings, and the fire source is weak, the temperature differencebetween the plume and the ambient, which gives the plume buoyancy, mayvanish and actually reverse in sign. Eventually the plume ceases to rise.Figure: Theoretical behavior of centerline plume variables in linearlytemperature-stratified ambients. Curve A: ratio of temperature rises (stratifiedversus unstratified), Curve B: ratio of axial velocities. Curve C: ratio of plumeradii. Curve D: ratio of volumetric species concentrations. Where z: heightabove top of combustible (m) and Zm: maximum vertical penetration of plumefluid in stratified ambient (m)火災科學 2

三、請以史帝芬-波茲曼(Stefan-Boltzmann)公式,說明幅射熱熱傳特性(10 分),並針對設備測試、系統功能及性能設計方面,提出 3 種在防火工程(Fire Safety Engineering)上的運用情境(15 分)。

二、A sinusoidal voltage \( E \sin \omega t \), where \( t \) is time, is passed through a half-wave rectifier that clips the negative portion of the wave. Find the Fourier series of the resulting period function. \[ u(t) = \begin{cases} 0 & \text{if } -L < t < 0 \\ E \sin \omega t & \text{if } 0 < t < L \end{cases} \quad p = 2L = \frac{2\pi}{\omega} \]

最新課程

最新主題筆記

最新討論

18.《高級中等學校訂定學生服裝儀容規定之原則》提及,學生的服裝儀容於重要活動應遵守學校統一規定,學校對於違反規定者,得視情節,採取適當且合乎比例原則之輔導或管教措施,並不得加以處罰。實際上,為達班級凝聚之目的,同儕會相互約束統一服儀。上述情境最符合涂爾幹(E. Durkheim)的哪一個理論觀點? (A)道德規範 (B)社會正義 (C)權力展演 (D)社會認同

10.航空器駕駛員,駕駛航空器飛越禁航區者:(A)處三個月以下有期徒刑 (B)處六個月以下有期徒刑 (C)處二年以下有期徒刑拘役或新台幣40萬元以下罰金 (D)處一年以下有期徒刑

8. The private school mainly serves ______ families who can afford high tuition and extensive extracurricular programs. (A) negligible (B) ubiquitous (C) unsightly (D) affluent

40. 氣喘急性發作時,下列那一項 FeNO 的說明是錯誤? (A) 氣喘急性發作時 FeNO 會增加 (B) 出現症狀前,FeNO 已增加 (C) 肺功能先降低,FeNO 才會增加 (D) 支氣管的嗜伊紅性白血球增加時,FeNO 會增加

41. 請問常見過敏原塵蟎的大小為何? (A) 0.5cm~1cm (B) 0.1cm~0.5cm (C) 5mm~10mm (D) 1mm~5mm (E) 0.1mm~1mm

18. In the short run, there are 500 identical firms in a competitive market. The firms do not use any resources that are available in limited quantities, and each of them has the following cost structure: Which of the following is a point on the long-run supply curve? (A) P=$10, Q=500. (B) P=$6, Q=1,000. (C) P=$5, Q=500. (D) P=$5, Q=1,500.