Browsing by Issue Date, starting with "2011-04-20"

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High concentration suspended sediment measurements using time domain reflectometry
(2011-04-20)
Chung, Chih-Chung
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Lin, Chih-Ping
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土木工程學系
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防災與水環境研究中心
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Department of Civil Engineering
The existing methods of suspended sediment concentration (SSC) monitoring provide a measurement accuracy significantly influenced by the particle size of suspended sediments, function only under limited measurement range and are not cost effective for field maintenance as well as wide spatial coverage. The paper introduces an innovative SSC monitoring methodology based upon time domain reflectometry (TDR), especially emphasizing on optimum TDR measurement accuracy investigated theoretically and experimentally. Pertinent probe design, probe calibration, as well as data reduction procedures were proposed. Ultimately, the approach can achieve the measurement accuracy to adapt the derived hardware resolution and beyond. In addition, the performance evaluation was carried out considering possible influence factors including water salinity, sediment types and particle sizes, and leading cable lengths. TDR SSC measurements indicate insensitive to sediment particle sizes. After proper calibration, the measurements are also insensitive to water electrical conductivity and not affected by leading cable resistances. There are further advantages of the TDR method including high measurement range from 2 to at least 300 g L(-1), easy calibration, robustness, maintainability, and cost-effective multiplexing. (C) 2011 Elsevier B.V. All rights reserved.
交大e-News第092期
(2011-04-20)
Secretariat
;
國立交通大學秘書室
Thermal Decomposition of Ethanol. 4. Ab Initio Chemical Kinetics for Reactions of H Atoms with CH3CH2O and CH3CHOH Radicals
(2011-04-21)
Xu, Z. F.
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Xu, Kun
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Lin, M. C.
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應用化學系
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Department of Applied Chemistry
The potential energy surfaces of H-atom reactions with CH3CH2O and CH3CHOH, two major radicals in the decomposition and oxidation of ethanol, have been studied at the CCSD-(T)/6-311+G(3df,2p) level of theory with geometric optimization carried out at the BH&HLYP/6-311+G(3df,2p) level. The direct hydrogen abstraction channels and the indirect association/decomposition channels from the chemically activated ethanol molecule have been considered for both reactions. The rate constants for both reactions have been calculated at 100-3000 K and 10(-4) Torr to 10(3) atm Ar pressure by microcanonical VTST/RRKM theory with master equation solution for, all accessible product channels. The results show that the major product channel of the CH3CH2O + H reaction is CH3 + CH2OH under atmospheric pressure conditions. Only at high pressure and low temperature, the rate constant for CH3CH2OH formation by collisonal deactivation becomes dominant. For CH3CHOH + H, there are three major product channels; at high temperatures, CH3+CH2OH production predominates at low pressures (P < 100 Torr), while the formation of CH3CH2OH by collisional deactivation becomes competitive at high pressures and low temperatures (T < 500 K). At high temperatures, the direct hydrogen abstraction reaction producing CH2CHOH + H-2 becomes dominant. Rate constants for all accessible product channels in both systems have been predicted and tabulated for modeling applications. The predicted value for CH3CHOH H at 295 K and 1 Torr pressure agrees;closely with available experimental data. For practical modeling applications, the rate constants for the thermal unimolecular decomposition of ethanol giving key accessible products have been predicted; those for the two major product channels taking place by dehydration and C-C breaking agree closely with available literature data.
Thermal Decomposition of Ethanol. 4. Ab Initio Chemical Kinetics for Reactions of H Atoms with CH(3)CH(2)O and CH(3)CHOH Radicals
(2011-04-21)
Xu, Z. F.
;
Xu, Kun
;
Lin, M. C.
;
應用化學系
;
Department of Applied Chemistry
The potential energy surfaces of H-atom reactions with CH(3)CH(2)O and CH(3)CHOH, two major radicals in the decomposition and oxidation of ethanol, have been studied at the CCSD-(T)/6-311+G(3df,2p) level of theory with geometric optimization carried out at the BH&HLYP/6-311+G(3df,2p) level. The direct hydrogen abstraction channels and the indirect association/decomposition channels from the chemically activated ethanol molecule have been considered for both reactions. The rate constants for both reactions have been calculated at 100-3000 K and 10(-4) Torr to 10(3) atm Ar pressure by microcanonical VTST/RRKM theory with master equation solution for, all accessible product channels. The results show that the major product channel of the CH(3)CH(2)O + H reaction is CH(3) + CH(2)OH under atmospheric pressure conditions. Only at high pressure and low temperature, the rate constant for CH(3)CH(2)OH formation by collisonal deactivation becomes dominant. For CH(3)CHOH + H, there are three major product channels; at high temperatures, CH(3)+CH(2)OH production predominates at low pressures (P < 100 Torr), while the formation of CH(3)CH(2)OH by collisional deactivation becomes competitive at high pressures and low temperatures (T < 500 K). At high temperatures, the direct hydrogen abstraction reaction producing CH(2)CHOH + H(2) becomes dominant. Rate constants for all accessible product channels in both systems have been predicted and tabulated for modeling applications. The predicted value for CH(3)CHOH H at 295 K and 1 Torr pressure agrees;closely with available experimental data. For practical modeling applications, the rate constants for the thermal unimolecular decomposition of ethanol giving key accessible products have been predicted; those for the two major product channels taking place by dehydration and C-C breaking agree closely with available literature data.
NANOPARTICLE AND MAGNETIC RESONANCE IMAGING CONTRAST AGENT
(2011-04-21)
Wang, Yun-Ming
;
Chen, Ting-Jung
A nanoparticle contains a core including superparamagnetic nanoparticles and having an outer surface, and siloxanyl moieties covalently coupled to the outer surface of the core and having Formula (I):In formula (I): X1 and X2 independently represent methylene, ethylene or propylene; R represents an optionally substituted pyridyl group, or —S—R is a group derived from a targeting ligand containing —SH group and effective to bind specifically with a predetermined targeted cell in an object; n and m independently represent an integer ranging from 1 to 3; and p represents an integer ranging from 9 to 45. The nanoparticles are suitable for use as a magnetic resonance imaging contrast agent.
高電子移動度トランジスタの構造、その構造を含んだデバイス及びその製造方法
(2011-04-21)
張翼
;
▲呉▼ 雲驥
;
林岳欽
【課題】ＭＭＩＣのＳＰＤＴスイッチなど、半導体デバイスとして用いるのに適したＭＯＳ－ＰＨＥＭＴの構造及びその製造方法を開示する。【解決手段】ＭＯＳ－ＰＨＥＭＴ構造は、Ａｌ２Ｏ３、ＨｆＯ２、Ｌａ２Ｏ３及びＺｒＯ２からなる群から選ばれる材料からなるゲート誘電体層107を有することを特徴とし、これにより、このＭＯＳ－ＰＨＥＭＴの構造を含む、高周波スイッチデバイスなどの半導体構造が、直流電流の損失及び挿入損失の低下を防ぎ、隔絶性を向上させることができる。【選択図】図１Ｅ
Particle charger with sheath air flow for enhancing charging efficiency
(2011-04-21)
Tsai, Chuen-Jinn
;
Guan-Yu, Lin
;
Hui-Lin, Chen
A particle charger with sheath air flow for enhancing charging efficiency includes a housing and a discharge wire. The housing has a charging chamber for accommodating the discharge wire, a particle inlet, a sheath air inlet, an outlet and an accelerating channel. A clean sheath air is guided through the sheath air inlet into the charging chamber to surround charged particles, reducing deposition of charged particles on the inside wall of the housing. A relatively small annular gap of accelerating channel accelerates the charged particles to exit the particle charger, and therefore minimized the particle electrostatic loss due to depositing on the inner surface of the housing. Additionally, uncharged particles approach the discharge wire axially, and charged particles move away radially. It is helpful for the charged particles to diffuse rapidly and uniformly, thereby enhancing the charging efficiency.
Method for virtual bass synthesis
(2011-04-21)
Bai, Mingsian R.
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Tseng, Wen-Liang
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Lin, Wan-Chi
This invention relates to a method for virtual bass synthesis. The low frequency signal is attained by applying a low pass filter to the original. In order to reduce the operations, process of down sampling the low frequency signal, moving the low frequency signal to a series of harmonics whose frequencies are integral times as large as the frequency of low frequency signals, and then up sampling them are provided. By means of psycho-acoustic theory, the weights of harmonics are attained and applied to the harmonics. Finally the weighted harmonics are combined to produce the bass signal. As the result, the virtual bass effect which is almost the same as the low frequency of the original audio signal can be accomplished. Because the harmonic signals are high frequency ones, the virtual effect can be made in the panel speakers or ordinary low-end speakers.
OHMIC CONTACT OF III-V SEMICONDUCTOR DEVICE AND METHOD OF FORMING THE SAME
(2011-04-21)
CHANG, Edward Yi
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KUO, Chien-I
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CHANG, Chun-Yen
Heavily doped epitaxial SiGe material or epitaxial InxGa1-xAs are used to form the source and drain of III-V semiconductor device to apply stress to the channel of III-V semiconductor device. Therefore, the electron mobility can be increased.
Pin-out Designation Method for Package-Board Codesign
(2011-04-21)
Lee, Ren-Jie
;
Chen, Hung-Ming
A pin out designation method for package board codesign having steps of defining pin characteristics and requirements, generating multiple pin patterns, pin blocks construction and grouping and pin blocks floorplanning. Designers may use an EDA tool to generate multiple pin patterns, use the pin patterns to construct multiple pin blocks, group the pin blocks around four sides of a chip and adjusts the pin blocks into a minimized package size of the chip.
Dominant channels of exciton spin relaxation in photoexcited self-assembled (In,Ga)As quantum dots
(2011-04-22)
Liao, Yu-Huai
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Climente, Juan I.
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Cheng, Shun-Jen
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電子物理學系
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Department of Electrophysics
We present a comprehensive theoretical investigation of spin relaxation processes of excitons in photoexcited self-assembled quantum dots. The exciton spin relaxations are considered between dark- and bright-exciton states via the channels created by various spin-admixture mechanisms, including electron Rashba and Dresselhaus spin-orbital couplings (SOCs), hole linear and hole cubic SOCs, and electron hyperfine interactions, incorporated with single-and double-phonon processes. The hole-Dresselhaus SOC is identified as the dominant spin-admixture mechanism, leading to relaxation rates as fast as similar to 10(-2) ns(-1), consistent with recent observations. Moreover, due to significant electron-hole exchange interactions, single-phonon processes are unusually dominant over two-phonon ones in a photoexcited dot even at temperatures as high as 15K.
勞基法增修小老闆叫苦
(2011-04-24)
張芳瑜
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Department of Communication and Technology
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傳播與科技學系
隨著台灣社會進步，許多法規也陸續增修，以期更符合當下社會的需求，這些在立院會議審議的法規裡，與勞工和雇主有密切相關的勞動基準法是近期大家關注的焦點之一。要如何增加並保障勞工福利，是許多勞工工會努力向社會推廣的目標，同時也是政府修改勞基法的的方向。
嗨！《親愛的醫生》
(2011-04-24)
林映綺
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Department of Communication and Technology
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傳播與科技學系
《親愛的醫生》在日本獲得許多大獎提名，看似簡單的故事背後卻蘊含許多醫病關係最深刻的道理。
性不性青少年迷思
(2011-04-24)
羅文婕
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Department of Communication and Technology
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傳播與科技學系
性除了是人的本能，也是一個自然現象，只要有身體，性就會是一輩子的課題，這應該是每個人都必須面對與學習的事。在針對多元性別文化納入教材與否做出討論前，也該增加對基本個人的性教育並提升教學品質，否則瞭解別人卻不瞭解自己的身體，就性教育的而言也有些本末倒置。
老闆，來一副蕭亞軒的睫毛
(2011-04-24)
林宜芳
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Department of Communication and Technology
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傳播與科技學系
假睫毛是許多女性的新寵。它們的裝飾性大幅超過原本保護眼睛的功能，成為女性魅力的指標。當自然不夠美時，各式各樣的假睫毛使女性更具自信，但適度的裝飾是加分，太誇張可能就有點嚇人。選擇假睫毛時，女性也面臨許多糾葛。
聽它們在敘說從前
(2011-04-24)
沈祐平
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Department of Communication and Technology
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傳播與科技學系
在它們沿街可見的時代，它們很平凡。歲月更迭中，它們默默地消失了，有些成為古蹟或文化遺產重點保存，有些沒有。
寧靜的觀光世外寶山峨眉
(2011-04-24)
李宜融
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Department of Communication and Technology
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傳播與科技學系
一條看不見盡頭的彎曲道路，搭著緩緩行駛在山稜上的高眺優越感，一覽兩旁山巒層層疊疊的延綿與雲霧纏繞，人煙與車輛皆來往稀少，讓人可以完全拋掉都市的喧囂感，新竹的寶山與峨眉鄉，便是這樣一個居於高處的修道仙人。
台灣傳統戲曲保存成難題
(2011-04-24)
李庭蕙
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Department of Communication and Technology
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傳播與科技學系
台北大龍峒保安宮所舉行的保生文化祭於4月7日熱鬧展開，現場來了許多歌仔戲死忠的戲迷，而也在開幕當天總統馬英九也親臨現場剪綵開幕。
總編輯的話
(2011-04-24)
呂靜宜
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Department of Communication and Technology
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傳播與科技學系
很榮幸有這個機會擔任《喀報》一零四期的總編輯，能夠在這邊和大家分享這一期的精彩內容。這一期共計有二十篇文章，分別是兩篇人物、四篇文化現象、一篇書評、三篇影評、三篇心情故事、一篇照片故事、四篇Flash和兩則廣播。
死刑知多少？
(2011-04-24)
張瑜庭
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Department of Communication and Technology
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傳播與科技學系
死刑的廢除與否，目前在世界上不少國家仍是相當具有爭議的話題。雖然現在世界上多數國家都已經廢除或停止執行，但民意卻不盡然完全支持。2010 年，不少國家仍持續執行死刑，其中多數國家集中在亞洲與非洲，當然，台灣也包含在內。至於死刑執行的方式，更是百百種，排除早期被大象採死、被石頭砸死等不人道的手段，目前國際上的「主流」執行方式包括絞刑、注射毒針、槍決、斬首和做電椅。其中，美國最常使用的注射毒針堪稱最為「人道」，但也因為成本較高，在其他執行地區較少被採用。2010 年國際特赦組織法國分會，拍攝了一支宣傳短片，希望能夠讓此議題獲得更多重視。