The thesis includes three parts : firstly, previous study and latest advance of molecular motor in biology are outlined, including myosin ' s and kinesin ' s construction and function, the latest advance of molecular motor in constructional biology ; secondly, the latest advance of molecular motor in physics is reviewed, including the general view of brownian motor and two examples of molecular motor, one being related to two kinds of flashing potention energy, the other being related to electronical bipole ; and finally, the model on unidirectional motion of molecular motor is in detail come up with, and especially, the interact ion between two heads is taken into account, followed by the construction of langevin equation and fokker - planck equation involved in the model. by using solutions of fokker - planck equation, unidirectional motion mechanism of molecular motor is analyzed
本文內容包括：首先綜述生物學領域分子馬達研究的最新進展，內容安排為：肌球蛋白的結構和功能，驅動蛋白的結構和功能，肌球蛋白和驅動蛋白定向運動
機制的結構生物學方面的最新進展；其次綜述並分析了當前研究分子馬達定向運動
機制的幾種物理模型，內容安排為：分子馬達運動的基本觀點和建構模型的一般方法，勢壘的兩態漲
落誘導的分子馬達運動模型，分子馬達定向運動的
偶極子模型；最後討論雙頭相互作用的分子馬達模型，內容安排為：先詳細論述模型的構建，再建立langevin方程和fokker - planck方程，接著用差分的方法求解出fokker - planck方程的解，然後分析和研究分子馬達定向運動的
機制。
A large planar microphone array, which consists of 111 microphones, was successfully applied to obtain a two - dimensional mapping of the sound sources on a landing aircraft. the focus of study in this paper is on the landing gear noise source. the spectra, directivities and sound pressure levels of flap side - edge noise of 7 narrow - board commercial aircraft and 7 wide - board commercial aircraft are presented. it is found that the landing gear noise spectrum is broadband with some single tones in some cases. the directivity of the total sound pressure level of a landing gear noise resembles that of a horizontal dipole. the level differences between the various aircraft landing gears are larger than those expected from the airspeed differences. it is thus expected that the louder noise emission of the landing gears can be reduced by redesigning
應用由111個傳聲器組成的平面傳聲器陣列對當前流行的民用客
機進場著陸過程中的
機體噪聲源進行了實驗測量，本文對七架窄體客
機和七架寬體客
機的起
落架噪聲進行了分析，得到了起
落架噪聲的頻譜特性、指向特性和聲級變化.研究發現，起
落架噪聲的頻譜是由寬頻隨
機噪聲與一些較為明顯的單音噪聲源組成，起
落架噪聲的指向性類似於一個水平放置的
偶極子.不同飛
機起
落架噪聲的聲級相差較大，這說明可以通過重新結構設計降低起
落架噪聲。
Was planning to leave for florida on september 22 to celebrate the mid - autumn festival with master. unexpectedly, in the early morning of september 21, my world turned upside down when i found myself in the area most devastated by the formosan earthquake - the yuchi mountain region. amid pitch darkness and absolute silence, i could hear rocks tumbling down the hills and trees falling in landslides every now and then
訂9月22日搭
機前往佛州與師父歡度中秋佳節，怎奈9月21日凌晨，頓時天搖地動天地變色，身處全省最嚴重的災區之一魚池山區，一片漆黑中，萬籟俱寂，
偶爾傳來後山
落石，前山山崩樹倒的聲響，當下的心情是無助與無奈，誰也料不到災難是這般迅雷不及掩耳的降臨，還來不及去見師父呢！
Abstract : a large planar microphone array, which consists of 111 microphones, was successfully applied to obtain a two - dimensional mapping of the sound sources on a landing aircraft. the focus of study in this paper is on the landing gear noise source. the spectra, directivities and sound pressure levels of flap side - edge noise of 7 narrow - board commercial aircraft and 7 wide - board commercial aircraft are presented. it is found that the landing gear noise spectrum is broadband with some single tones in some cases. the directivity of the total sound pressure level of a landing gear noise resembles that of a horizontal dipole. the level differences between the various aircraft landing gears are larger than those expected from the airspeed differences. it is thus expected that the louder noise emission of the landing gears can be reduced by redesigning
文摘:應用由111個傳聲器組成的平面傳聲器陣列對當前流行的民用客
機進場著陸過程中的
機體噪聲源進行了實驗測量，本文對七架窄體客
機和七架寬體客
機的起
落架噪聲進行了分析，得到了起
落架噪聲的頻譜特性、指向特性和聲級變化.研究發現，起
落架噪聲的頻譜是由寬頻隨
機噪聲與一些較為明顯的單音噪聲源組成，起
落架噪聲的指向性類似於一個水平放置的
偶極子.不同飛
機起
落架噪聲的聲級相差較大，這說明可以通過重新結構設計降低起
落架噪聲。
Spears, hunting guns, rifles of foreign make and ancient vintage, here and there a rare machine gun - these were their arms
長矛、火槍、外國造的老式步槍、零零
落落地
偶爾有挺
機槍? ?這些就是他們的武器。
In practice, the burden of enforcing the law falls on the individual woman, and demonstrating systematic bias has proved difficult despite some successes, like a recent ruling upholding the award of 1. 6 million to 12 women who charged that their company discriminated against them in pay and promotions
在實踐中，實施該項法令的重擔落在了單個兒的婦女身上；但要證明這種社會偏見並非偶然現象絕非易事，盡管也取得了一些成功，例如，最近法院裁定給予12名控告公司在薪水和升職機會上歧視她們的婦女160萬美元的獎勵。
