Browsing by Issue Date, starting with "2014-07-02"

Now showing 1 - 20 of 26044

Iron(III) Bound by Hydrosulfide Anion Ligands: NO-Promoted Stabilization of the [Fe-III-SH] Motif
(2014-07-02)
Tsou, Chih-Chin
;
Chiu, Wei-Chun
;
Ke, Chun-Hung
;
Tsai, Jia-Chun
;
Wang, Yun-Ming
Spontaneous transformation of the thermally stable [HS](-)bound {Fe(NO)(2)}(9) dinitrosyl iron complex (DNIC) [(HS)(2)Fe(NO)(2)](-) (1) into [(NO)(2)Fe(mu-S)](2)(2-) (Roussin's red salt (RRS)) along with release of H2S, probed by NBD-SCN (NBD = nitrobenzofurazan), was observed when DNIC 1 was dissolved in water at ambient temperature. The reversible transformation of RRS into DNIC 1 (RRS -> DNIC 1) in the presence of H2S was demonstrated. In contrast, the thermally unstable hydrosulfide-containing mononitrosyl iron complex (MNIC) [(HS)(3)Fe-III(NO)](-) (3) and [Fe-III(SH)(4)](-) (5) in THF/DMF spontaneously dimerized into the first structurally characterized Fe-III-hydrosulfide complexes [(NO)(SH)Fe(mu-S)](2)(2-) (4) with two {Fe(NO)}(7) motifs antiferromagnetically coupled and [(SH)(2)Fe(mu-S)](2)(2-) (6) resulting from two Fe-III (S = 5/2) centers antiferromagnetically coupled to yield an S = 0 ground state with thermal occupancy of higher spin states, respectively. That is, the greater the number of NO ligands bound to [2Fe2S], the larger the antiferromagnetic coupling constant. On the basis of DFT computation and the experimental (and calculated) reduction potential (E-1/2) of complexes 1, 3, and 5, the NO-coordinate ligand(s) of complexes 1 and 3 serves as the stronger electron-donating ligand, compared to thiolate, to reduce the effective nuclear charge (Z(eff)) of the iron center and prevent DNIC 1 from dimerization in an organic solvent (MeCN).
Iron(III) Bound by Hydrosulfide Anion Ligands: NO-Promoted Stabilization of the [Fe-III-SH] Motif
(2014-07-02)
Tsou, Chih-Chin
;
Chiu, Wei-Chun
;
Ke, Chun-Hung
;
Tsai, Jia-Chun
;
Wang, Yun-Ming
Spontaneous transformation of the thermally stable [HS](-)bound {Fe(NO)(2)}(9) dinitrosyl iron complex (DNIC) [(HS)(2)Fe(NO)(2)](-) (1) into [(NO)(2)Fe(mu-S)](2)(2-) (Roussin\'s red salt (RRS)) along with release of H2S, probed by NBD-SCN (NBD = nitrobenzofurazan), was observed when DNIC 1 was dissolved in water at ambient temperature. The reversible transformation of RRS into DNIC 1 (RRS -> DNIC 1) in the presence of H2S was demonstrated. In contrast, the thermally unstable hydrosulfide-containing mononitrosyl iron complex (MNIC) [(HS)(3)Fe-III(NO)](-) (3) and [Fe-III(SH)(4)](-) (5) in THF/DMF spontaneously dimerized into the first structurally characterized Fe-III-hydrosulfide complexes [(NO)(SH)Fe(mu-S)](2)(2-) (4) with two {Fe(NO)}(7) motifs antiferromagnetically coupled and [(SH)(2)Fe(mu-S)](2)(2-) (6) resulting from two Fe-III (S = 5/2) centers antiferromagnetically coupled to yield an S = 0 ground state with thermal occupancy of higher spin states, respectively. That is, the greater the number of NO ligands bound to [2Fe2S], the larger the antiferromagnetic coupling constant. On the basis of DFT computation and the experimental (and calculated) reduction potential (E-1/2) of complexes 1, 3, and 5, the NO-coordinate ligand(s) of complexes 1 and 3 serves as the stronger electron-donating ligand, compared to thiolate, to reduce the effective nuclear charge (Z(eff)) of the iron center and prevent DNIC 1 from dimerization in an organic solvent (MeCN).
社造下的客家社區新風貌
(2014-07-02)
黃淑鈴
;
Department of Communication and Technology
;
傳播與科技學系
《新客家人群像》系列專書的出版，是國立交通大學傳播與科技學系大一新生最重要的實作成果發表，除了訓練同學們的採訪與寫作技巧，也讓他們從中了解當今客家人豐富多元的面貌。過去五年來我們以人物特寫為主軸，今年則是新的嘗試，以深度報導的形式呈現，並將觸角轉向社區，期能提供一個觀看客家的新視野。
堅守崗位的客家媒體人
(2014-07-02)
黃淑鈴
;
Department of Communication and Technology
;
傳播與科技學系
一九八八年客家人走上台北街頭，發起「還我母語運動」，要求政府全面開放客語電視節目、修改廣電法對方言的限制、建立多元開放的語言政策等。時隔二十餘年，運動的部分訴求逐一實現，除了寶島等客家電台從地下走上合法化，客家電視台亦於二〇〇三年成立。新興的客語媒體及蓬勃的客家活動為客家文化提供了發聲的平台，傳布客家的影像、音樂、文字與聲音。
三坑老街很短　故事卻很長
(2014-07-02)
簡品心
;
Department of Communication and Technology
;
傳播與科技學系
那是二〇一二年入冬後最冷的一天，景物濛濛地全被雨絲遮了住，遊客寥寥。三坑老街彷彿回歸了那個沒落卻幽靜的時代，然而，三兩行經的遊人與店家的招呼聲，又使居民憶起了愈加久遠之前，這條街如何背負著「龍潭第一街」的盛名，繁榮昌盛。
傳統中的創新-見證客家文化的恆與變
(2014-07-02)
黃淑鈴
;
Department of Communication and Technology
;
傳播與科技學系
「為什麼要寫客家？」記得傳播基礎寫作第一次上課時，許多一〇三級同學們表達了自己是在陰錯陽差之下進了交大傳播與科技學系，有些人甚至不清楚這個系隸屬於客家文化學院。就這樣，大家「被迫」咿咿呀呀學起了客語，透過導論課走訪各地客家庄，甚至寫作課都被指定要寫客家人物。一個個稚氣未脫的臉龐上，寫滿了不解與無奈。
Non-conventional three-armed star-shaped mesogens based on 1,3,5-trisubstituted benzene with azobenzene moieties at the periphery: synthesis, and mesomorphic behaviour
(2014-07-03)
Ooi, Yew-Hong
;
Yeap, Guan-Yeow
;
Han, Chun-Chieh
;
Lin, Hong-Cheu
;
Shinomiya, Teruo
A series of new symmetrical trimeric star-shaped mesogens in which the molecular architecture composed of three 4-[(4-substituted-phenyl)diazenyl]phenoxy-6-bromohexane connected as the pheripheral units to 1,3,5-positions of the benzene core group have been synthesised and fully characterised by physical measurements and spectroscopic techniques (carbon, hydrogen and nitrogen microanalysis, Fourier transform-infrared spectroscopy and nuclear magnetic resonance: CHN, FT-IR and NMR). At one end of the para-position of the azobenzene fragment consists of different terminal substituents X=F, Cl, Br, I, C2H5 and OC2H5. The thermal behaviour and mesomorphic properties of the star-shaped compounds were investigated by means of differential scanning calorimetry, polarizing optical microscopy (POM) and X-ray diffraction analyses. Moreover, the liquid-crystalline properties of all the intermediates 4-[(4-substituted-phenyl)diazenyl]phenoxy-6-bromohexane were also evaluated. Whilst all the star-shaped compounds exhibit nematic and smectic A phases, the mesogens with chloro- and bromo-terminal substituents were found to show soft crystalline phase. The smectic phase and the possible molecular arrangement of the star-shaped molecule within the anisotropic region were further substantiated by the XRD. In addition to a low-angle sharp peak (reflecting the layered structure), a diffuse wide-angle peak indicating the liquid-like order within the smectic layer was recorded. A comparative study between the properties of the present azo mesogens and the earlier reported star-shaped mesogens from Schiff bases is also discussed.
InAs-based heterostructure field-effect transistor using AlAs0.16Sb0.84 double barriers
(2014-07-03)
Lin, Yue-Min
;
Lin, Kun-Ping
;
Lee, Ting-Chi
;
Li, Meng-Ying
;
Lee, Chien-Ping
An InAs-channel heterostructure field-effect transistor on GaAs substrates is presented. The conduction channel was formed by the InAs/AlAs0.16Sb0.84/AlSb quantum well. With the addition of the AlAs0.16Sb0.84 layer, holes that are generated by impact ionisation at high voltages are effectively confined in the InAs channel because of the large Delta Ev in this type-I heterostructure. By suppressing the hole injection into and accumulation in the buffer layer, the feedback through the back gate is eliminated and excellent output characteristics were obtained. The fabricated devices had a threshold voltage of about -0.6 V with a channel mobility of 18 100 cm(2)/V-s and a sheet carrier density of 1.2 x 10(12) cm(-2).
Editorial introduction: Chen Yingzhen and his time
(2014-07-03)
Chen, Kuan-Hsing
;
社會與文化所
;
Institute of Social Research and Culture Studies
PRESSURE AND SHEAR FORCE MEASUREMENT DEVICE AND METHOD
(2014-07-03)
Huang Cheng-Sheng
;
Yang Bing-Shiang
;
Jang Wen-Yea
A pressure and shear force measurement device and a pressure and shear force measurement method are disclosed. The measurement device includes a flexible substrate; a plurality of signal outputting units embedded in the flexible substrate for outputting signals; and a plurality of signal detectors disposed at a peripheral of the flexible substrate for receiving at least a signal outputted from the signal outputting units, wherein when the flexible substrate has a load applied thereon and each of the signal outputting units has a displacement, each of the signal detectors detects a pressure and a shear force resulting from the load on the flexible substrate based on the signal received from the signal outputting units.
Revisiting dual-role factors in data envelopment analysis: derivation and implications
(2014-07-03)
Chen, Wen-Chih
;
工業工程與管理學系
;
Department of Industrial Engineering and Management
Data Envelopment Analysis (DEA) is a mathematical programming method to evaluate relative performance. Typical DEA studies consider a production process transforming inputs to outputs. In some cases, however, some factors can be both inputs and outputs simultaneously and are termed dual-role factors. For example, research funding can be an input that strengthens a university's academic performance and the actual funds can be an output. This article investigates the problem of how to incorporate dual-role factors in DEA. Rather than proposing an ad hoc evaluation model directly, this article considers the concept of "joint technology," two individual production processes acting in common by summarizing the intuitive thinking. The efficiency evaluation models, based on variant assumptions, thus can be axiomatically derived, validated, and extended. How to determine the input/output tendency of a dual-role factor based on the evaluating results is shown and explained from different aspects. It is concluded that the tendency is a property on the projected boundary, not the data point itself.
InAs-based heterostructure field-effect transistor using AlAs0.16Sb0.84 double barriers
(2014-07-03)
Lin, Yue-Min
;
Lin, Kun-Ping
;
Lee, Ting-Chi
;
Li, Meng-Ying
;
Lee, Chien-Ping
An InAs-channel heterostructure field-effect transistor on GaAs substrates is presented. The conduction channel was formed by the InAs/AlAs0.16Sb0.84/AlSb quantum well. With the addition of the AlAs0.16Sb0.84 layer, holes that are generated by impact ionisation at high voltages are effectively confined in the InAs channel because of the large Delta Ev in this type-I heterostructure. By suppressing the hole injection into and accumulation in the buffer layer, the feedback through the back gate is eliminated and excellent output characteristics were obtained. The fabricated devices had a threshold voltage of about -0.6 V with a channel mobility of 18 100 cm(2)/V-s and a sheet carrier density of 1.2 x 10(12) cm(-2).
FALL DETECTION AND PROTECTION SYSTEM AND METHOD
(2014-07-03)
Yang Bing-Shiang
;
Lin Cheng-Wei
The invention provides a fall detection and protection system and method. The fall detection and protection system includes a guarding device to be worn on a user, and a portable device having a pre-determined threshold value stored therein for detecting an activity of a user to acquire an activity status value, which is to be compared with the threshold value so as to detect and determine whether the user falls. When a fall is detected, the portable device transmits a triggering signal to the guarding device to activate the guarding function of the guarding device, thereby preventing the user from injury caused by the impact and collision of a fall.
ROTATION TYPE OPTICAL TOMOGRAPHY SCANNER
(2014-07-03)
Fang Wai-Chi
;
Chen Tien-Ho
;
Kang Shih
;
Wu Shih-Yang
;
Cheng Ching-Ju
A rotation type optical tomography scanner is provided, including an illuminating unit disposed on a surface of an object-to-be-detected for emitting incident light to tissues under the surface of the object-to-be-detected; a detecting unit disposed on the object-to-be-detected and rotating around the illuminating unit to receive diffuse light diffused from the tissues under the surface of the object-to-be-detected and generate tissue sensing information; and a positioning unit for generating position information of the rotation type optical tomography scanner. The rotation type optical tomography scanner transmits the sensing information and the position information to a remodel module to rebuild the tissue images under the surface of the object-to-be-detected, thereby expanding the scanning range of the object-to-be-detected.
Efficiency enhancement of non-selenized Cu(In,Ga)Se-2 solar cells employing scalable low-cost antireflective coating
(2014-07-04)
Jheng, Bao-Tang
;
Liu, Po-Tsun
;
Wu, Meng-Chyi
;
光電工程學系
;
顯示科技研究所
In this study, a non-selenized CuInGaSe2 (CIGS) solar device with textured zinc oxide (ZnO) antireflection coatings was studied. The ZnO nanostructure was fabricated by a low-temperature aqueous solution deposition method. With controlling the morphology of the solution-grown tapered ZnO nanorod coatings, the average reflectance of the CIGS solar device decreased from 8.6% to 2.1%, and the energy conversion efficiency increased from 9.1% to 11.1%. The performance improvement in the CuInGaSe2 thin-film solar cell was well explained due to the gradual increase of the refractive index between air and the top electrode of solar cell device by the insertion of the ZnO nanostructure. The results demonstrate a potential application of the ZnO nanostructure array for efficient solar device technology.
Surveillance on-the-road: Vehicular tracking and reporting by V2V communications
(2014-07-04)
Chen, Lien-Wu
;
Tseng, Yu-Chee
;
Syue, Kun-Ze
;
資訊工程學系
;
Department of Computer Science
Vehicular networks have attracted a lot of attention recently. One potential application of vehicular networks is to use video cameras embedded in vehicles to support video surveillance, which we call "surveillance on-the-road". Traditional surveillance systems only rely on fixed stations on the roads to monitor road conditions. With vehicular cameras, deeper and richer road conditions may be tracked. In this paper, we study the related communication issues to support such "on-the-road" surveillance scenarios. We use monitoring and tracking suspicious vehicles (such as stolen cars) on the road through license plate recognition (LPR) as an example (our results should be applicable to other scenarios as well). We show how vehicles can work cooperatively through vehicle-to-vehicle (V2V) communications to achieve this goal. With a tracking and a reporting modules, our solution does not rely on infrastructure networks. The tracking module allows handoff of a tracking job to neighboring vehicles as necessary and report of suspicious vehicles to nearby police cars. The reporting module can help guide message flows to avoid flooding the network. Simulation results verify the message efficiency of our approach. We also show how our framework can be applied to the developing WAVE/DSRC (Wireless Access in Vehicular Environments/Dedicated Short Range Communications) standards. (C) 2014 Elsevier B.V. All rights reserved.
Efficiency improvement of InGaP/GaAs/Ge solar cells by hydrothermal-deposited ZnO nanotube structure
(2014-07-05)
Chung, Chen-Chen
;
Binh Tinh Tran
;
Lin, Kung-Liang
;
Ho, Yen-Teng
;
Yu, Hung-Wei
In this paper, a zinc oxide (ZnO) nanotube, fabricated by the hydrothermal growth method on triple-junction (T-J) solar cell devices to enhance efficiency, is investigated. Compared to those of bare T-J solar cells (without antireflection (AR) coating) and solar cells with Si3N4 AR coatings, the experimental results show that the T-J solar cells, which use a ZnO nanotube as an AR coating, have the lowest reflectance in the short wavelength spectrum. The ZnO nanotube has the lowest light reflection among all experimental samples, especially in the range of 350 to 500 nm from ultraviolet (UV) to visible light. It was found that a ZnO nanotube can enhance the conversion efficiency by 4.9%, compared with a conventional T-J solar cell. The Si3N4 AR coatings also enhance the conversion efficiency by 3.2%.The results show that a cell with ZnO nanotube coating could greatly improve solar cell performances.
中正大社區客家藝文饗宴
(2014-07-06)
Department of Communication and Technology
;
傳播與科技學系
社區總體營造，一個為了建立社區文化、凝聚社區共識而形成的政策性名詞，近幾年來盛行於台灣大街小巷的各個社區中。其中，桃園縣龍潭鄉中正社區也不例外。然而，最獨特的在於，這裡是桃園最大的客家社區。
Insulating state to quantum Hall-like state transition in a spin-orbit-coupled two-dimensional electron system
(2014-07-07)
Lo, Shun-Tsung
;
Hsu, Chang-Shun
;
Lin, Y. M.
;
Lin, S-D
;
Lee, C. P.
We study interference and interactions in an InAs/InAsSb two-dimensional electron system. In such a system, spin-orbit interactions are shown to be strong, which result in weak antilocalization (WAL) and thereby positive magnetoresistance around zero magnetic field. After suppressing WAL by the magnetic field, we demonstrate that classical positive magnetoresistance due to spin-orbit coupling plays a role. With further increasing the magnetic field, the system undergoes a direct insulator-quantum Hall transition. By analyzing the magnetotransport behavior in different field regions, we show that both electron-electron interactions and spin-related effects are essential in understanding the observed direct transition. (C) 2014 AIP Publishing LLC.
Recombination dynamics of a localized exciton bound at basal stacking faults within the m-(p)lane ZnO film
(2014-07-07)
Yang, S.
;
Hsu, H. C.
;
Liu, W-R.
;
Lin, B. H.
;
Kuo, C. C.
We investigated the carrier dynamics near basal stacking faults (BSFs) in m-plane ZnO epitaxial film. The behaviors of the type-II quantum wells related to the BSFs are verified through time-resolved and time-integrated photoluminescence. The decay time of the emission of BSFs is observed to have a higher power law value and longer decay time than the emission of the donor-bound excitons. The spectral-dependent decay times reveal a phenomenon of carriers migrating among band tail states, which are related to the spatial distribution of the type-II quantum wells formed by the BSFs. A high density of excited carriers leads to a band bending effect, which in turn causes a blue-shift of the emission peak of BSFs with a broadened distribution of band tail states. (C) 2014 AIP Publishing LLC.