Browsing by Issue Date, starting with "2017-11-20"

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交大e-News第244期-文創結合VR/AR新科技交大賦予漫畫英雄《諸葛四郎》新生命
(2017-11-20)
國立交通大學秘書室
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Secretariat
Using a Single VCSEL Source Employing OFDM Downstream Signal and Remodulated OOK Upstream Signal for Bi-directional Visible Light Communications
(2017-11-20)
Yeh, Chien-Hung
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Wei, Liang-Yu
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Chow, Chi-Wai
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光電工程學系
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光電工程研究所
In this work, we propose and demonstrate for the first time up to our knowledge, using a 682 nm visible vertical-cavity surface-emitting laser (VCSEL) applied in a bi-directional wavelength remodulated VLC system with a free space transmission distance of 3 m. To achieve a high VLC downstream traffic, spectral efficient orthogonal-frequency-division-multiplexing quadrature-amplitude-modulation (OFDM-QAM) with bit and power loading algorithms are applied on the VCSEL in the central office (CO). The OFDM downstream wavelength is remodulated by an acousto-optic modulator (AOM) with OOK modulation to produce the upstream traffic in the client side. Hence, only a single VCSEL laser is needed for the proposed bi-directional VLC system, achieving 10.6 Gbit/s OFDM downstream and 2 Mbit/s remodulated OOK upstream simultaneously. For the proposed system, as a single laser source with wavelength remodulation is used, the laser wavelength and temperature managements at the client side are not needed; and the whole system could be cost effective and energy efficient.
Imbalanced plasma ACE and ACE2 level in the uremic patients with cardiovascular diseases and its change during a single hemodialysis session
(2017-11-20)
Yang, Chung-Wei
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Lu, Li-Che
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Chang, Chia-Chu
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Cho, Ching-Chang
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Hsieh, Wen-Yeh
Background: The renin-angiotensin system (RAS) has significant influences on heart and renal disease progression. Angiotensin converting enzyme (ACE) and angiotensin converting enzyme II (ACE2) are major peptidases of RAS components and play counteracting functions through angiotensin II (Ang II)/ATIR and angiotensin-(1-7) (Ang-(1-7))/Mas axis, respectively. Methods: There were 360 uremic patients on regular hemodialysis (HD) treatment (inclusive of 119 HD patients with cardiovascular diseases (CVD) and 241 HD patients without CVD and 50 healthy subjects were enrolled in this study. Plasma ACE, ACE2, Ang II and Ang-(1-7) levels of the HD patients were determined. Results: We compared pre-HD levels of plasma ACE, ACE2, Ang II and Ang-(1-7) in the HD patients with and without CVD to those of the controls. The HD patients, particularly those with CVD, showed a significant increase in the levels of ACE and Ang II, whereas ACE2 and Ang-(1-7) levels were lower than those in the healthy controls. Therefore, imbalanced ACE/ACE2 was observed in the HD patients with CVD. In the course of a single HD session, the plasma ACE, ACE/ACE2 and Ang II levels in the HD patients with CVD were increased from pre-HD to post-HD. On the contrary, ACE2 levels were decreased after the HD session. These changes were not detected in the HD patients without CVD. Conclusions: Pathogenically imbalanced circulating ACE/ACE2 was detected in the HD patients, particularly those with CVD. HD session could increase ACE/Ang II/AT1R axis and decrease ACE2/Ang-(1-7)/Mas axis activity in the circulation of HD patients with CVD.
Label-Free and Nondestructive Separation Technique for Isolation of Targeted DNA from DNA-Protein Mixture Using Magnetic Au-Fe3O4 Nanoprobes
(2017-11-21)
Chowdhury, Ankan Dutta
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Agnihotri, Nidhi
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Doong, Ruey-an
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De, Amitabha
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環境工程研究所
The interest in DNAprotein-based diagnostics has recently been growing enormously, which makes the separation process of DNA or protein from a cell extract extremely important. Unlike the traditional separation process, a novel approach is in demand which can nondestructively isolate the target biomolecules without sacrificing the other components in the mixture. In this study, we have demonstrated a new and simple separation technique by using well-established bifunctional AuFe3O4 nanocomposites as the separation nanoprobes to efficiently isolate the specifically targeted nanomolar concentrated DNA over 70% from its associate DNAprotein mixture in the presence of a magnetic field. The sensing accuracy of both as-separated DNA and protein are quantitatively examined by UVvis spectroscopy, and then qualitatively validated by gel analysis. Results obtained in this study clearly demonstrated that this newly developed separation procedure not only provides the efficient separation for the targeted DNA but can also maintain the bioactivity of as-separated protein and DNA solutions. The superiority of this technique can open an avenue to establish a label-free and nondestructive platform for a wide variety of biomolecule separation applications.
Vibrational autoionization of state-selective jet-cooled methanethiol (CH3SH) investigated with infrared plus vacuum-ultraviolet photoionization
(2017-11-21)
Xie, Min
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Shen, Zhitao
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Pratt, S. T.
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Lee, Yuan-Pern
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應用化學系
Vibrational autoionization of Rydberg states provides key information about nonadiabatic processes above an ionization threshold. We employed time-of-flight mass detection of CH3SH+ to record vibrational-state selective photo-ionization efficiency (PIE) spectra of jet-cooled methanethiol (CH3SH) on exciting CH3SH to a specific vibrationally excited state with an infrared (IR) laser, followed by excitation with a tunable laser in the vacuum-ultraviolet (VUV) region for ionization. Autoionizing Rydberg states assigned to the ns, np, nd and nf series are identified. When IR light at 2601 (nu(3), SH stretching mode) and 2948 cm(-1) (nu(2), CH3 symmetric stretching mode) was employed, the Rydberg series converged to the respective vibrationally excited (nu(3) and nu(2)) states of CH3SH+. When IR light at 3014 cm(-1) (overlapped nu(1)/nu(9), CH3 antisymmetric stretching and CH2 antisymmetric stretching modes) was employed, Rydberg series converging to two vibrationally excited states (nu(1) and nu(9)) of CH3SH+ were observed. When IR light at 2867 cm(-1) (2 nu(10), overtone of CH3 deformation mode) and 2892 cm(-1) (2 nu(4), overtone of CH2 scissoring mode) was employed, both Delta nu = 01 and Delta nu = -2 ionization transitions were observed; there is evidence for direct ionization from the initial state into the CH3SH+ (nu(+)(4) = 1) continuum. In all observed IR-VUV-PIE spectra, the ns and nd series show intensity greater than the other Rydberg series, which is consistent with the fact that the highest-occupied molecular orbital of CH3SH is a p-like lone pair orbital on the S atom. The quantum yields for autoionization of various vibrational excited states are discussed. Values of nu(1) = 3035, nu(2) = 2884, nu(3) = 2514, and nu(9) = 2936 cm(-1) for CH3SH+ derived from the converged limits agree satisfactorily with values observed for Ar-tagged CH3SH+ at 3026, 2879, 2502, and 2933 cm(-1).
Highly selective turn-on probe for H2S with imaging applications in vitro and in vivo
(2017-11-21)
Thirumalaivasan, Natesan
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Venkatesan, Parthiban
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Wu, Shu-Pao
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應用化學系
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Department of Applied Chemistry
Hydrogen sulfide (H2S) is the third endogenous gaseous signaling molecule, and its distribution affects several biological processes. To clarify the roles of H2S in living systems, the exact determination of H2S in living cells in vivo has become an important issue. Herein, we report a novel pyrene-based fluorescent probe, PyN3, as a H2S turn-on sensor via reduction of azide to amine, which subsequently undergoes self-immolation through intramolecular 1,6-elimination of the rho-aminobenzyl moiety, releasing 1-aminopyrene and leading to the recovery of fluorescence intensity. With its high sensitivity, good selectivity, and low cytotoxicity, PyN3 was able to recognize both exogenous and endogenously produced H2S in biological systems. In contrast to the traditional azide-based H2S probes, PyN3 shows efficient and effective selectivity to H2S at biological pH ranges. Because of these promising properties, PyN3 is an excellent probe for visualizing endogenous H2S in vitro and in vivo.
Selective Deposition of Multiple Sensing Materials on Si Nanobelt Devices through Plasma-Enhanced Chemical Vapor Deposition and Device-Localized Joule Heating
(2017-11-22)
Lin, Ru-Zheng
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Cheng, Kuang-Yang
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Pan, Fu-Ming
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Sheu, Jeng-Tzong
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材料科學與工程學系奈米科技碩博班
This paper describes a novel method, using device-localized Joule heating OH) in a plasma enhanced atomic layer deposition (PEALD) system, for the selective deposition of platinum (Pt) and zinc oxide (ZnO) in the n(-) regions of n(+)/n(-)/n(+) polysilicon nanobelts (SNBs). COMSOL simulations were adopted to estimate device temperature distribution. However, during ALD process, the resistance of SNB device decreased gradually and reached to minima after 20 min JH. As a result, thermal decomposition of precursors occurred during PEALD process. Selective deposition in the n(-) region was dominated by CVD instead of ALD. Selective deposition of Pt and ZnO films has been achieved and characterized using atomic force microscopy, scanning electron microscopy, and transmission electron microscopy.
Encoding of menstrual pain experience with theta oscillations in women with primary dysmenorrhea
(2017-11-22)
Lee, Pin-Shiuan
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Low, Intan
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Chen, Yong-Sheng
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Tu, Cheng-Hao
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Chao, Hsiang-Tai
Theta oscillation (4-7 Hz) is well documented for its association with neural processes of memory. Pronounced increase of theta activity is commonly observed in patients with chronic neurogenic pain. However, its association with encoding of pain experience in patients with chronic pain is still unclear. The goal of the present study is to investigate the theta encoding of sensory and emotional information of long-term menstrual pain in women with primary dysmenorrhea (PDM). Forty-six young women with PDM and 46 age-matched control subjects underwent resting-state magnetoencephalography study during menstrual and periovulatory phases. Our results revealed increased theta activity in brain regions of pain processing in women with PDM, including the right parahippocampal gyrus, right posterior insula, and left anterior/middle cingulate gyrus during the menstrual phase and the left anterior insula and the left middle/inferior temporal gyrus during the periovulatory phase. The correlations between theta activity and the psychological measures pertaining to pain experience (depression, state anxiety, and pain rating index) implicate the role of theta oscillations in emotional and sensory processing of pain. The present study provides evidence for the role of theta oscillations in encoding the immediate and sustained effects of pain experience in young women with PDM.
METHOD AND SYSTEM FOR TRANSFORMING BETWEEN PHYSICAL IMAGES AND VIRTUAL IMAGES
(2017-11-23)
Jen-Hui Chuang
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Yi-Yu Hsieh
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Yu-Han Wei
A method for transforming between physical and virtual images includes: disposing an image capturing device at a position that does not coincide with line-of-sight of a user; providing at least three physical distance references on the line-of-sight of the user at different distances from the user, and capturing images of the at least three physical distance references by the image capturing device so as to obtain an epipolar line formed by at least three virtual distance references corresponding respectively to the images; and obtaining a first relation by a computing unit according to a position corresponding relationship between the at least three physical distance references and the at least three virtual distance references. By using the image capturing device that is at a fixed position relative to the user and does not coincide with the line-of-sight of the user, the physical position of an object is obtained.
In Situ Observation of Au Nanostructure Evolution in Liquid Cell TEM
(2017-11-23)
Chen, Ying-Chen
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Chen, Jui-Yuan
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Wu, Wen-Wei
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材料科學與工程學系
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Department of Materials Science and Engineering
Gold nanostructures (NSs) have been widely investigated due to their unique properties. Understanding their growth behaviors during synthesis will be beneficial in designing and applying to many functional nanodevices. It is important to enrich the fundamental science and technology of the synthesis and characterization through real time evolution. In this work, we observed the dynamic growth of Au NSs by using liquid in situ transmission electron microscopy (TEM). The solution was sealed in a liquid cell, and the results indicated that the thicker solution layer tended to form multi twinned decahedral NSs; in contrast, nanoplates easily formed in the thinner solution layer. The silver halide model, relying on side-face structures, and the Wulff construction can be used to explain the formation of NSs. Additionally, we analyzed the growth rate of different morphologies to elucidate their growth behaviors. The growth mechanism and formation kinetics of different shapes of Au NSs were systematically studied, which provided direct evidence toward and extended the study of reaction kinetics for modifying the morphology of NSs.
OPTICAL DETECTING DEVICE
(2017-11-23)
Mang OU-YANG
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Ting-Wei HUANG
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Hou-Chi CHIANG
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Zheng-Lin HE
An optical detecting device includes a reflecting element, a main body, a light source and a plurality of photosensitive elements. The reflecting element has a reflecting surface. The main body has an installing, surface. The installing surface at least partially faces to the reflecting surface. The main body is configured to move along, a moving direction relative to the reflecting element. The moving direction is substantially parallel with the reflecting surface. The light source is disposed on the installing surface and is configured to emit a light ray towards the reflecting surface. The photosensitive elements are disposed on the installing surface. Sides of the photosensitive elements close to the light source surround the light source to form a light source region. The light source is at least partially located in the light source region.
Nanoscale Ferromagnetic Cobalt-Doped ZnO Structures Formed by Deep-UV Direct-Patterning
(2017-11-23)
Yeh, Chun-Cheng
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Colis, Silviu
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Fioux, Philippe
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Zan, Hsiao-Wen
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Berling, Dominique
Cobalt (II) acetate is mixed with zinc methacrylate (ZnMAA) to form a photopatternable Co-doped zinc oxide precursor. By using deep-UV (DUV) interference lithography, Co-doped ZnMAA precursor can be patterned as negative tone resist and transformed into ferromagnetic Co:ZnO films after thermal treatment. Moreover, Co:ZnO patterns as small as 300 nm line-width can be easily obtained. To have an in-depth understanding to the effect of DUV-patterning process as well as thermal annealing on Co:ZnO films derived from Co-doped ZnMAA precursor, optical, magnetic, and electrical characterizations are performed on Co:ZnO films prepared in different conditions. For the Co:ZnO film prepared without DUV-patterning, large zero-field-cooling (ZFC)-field-cooling (FC) irreversibility appears in superconducting quantum interference device measurements after vacuum annealing, indicating that Co clusters have formed inside the film. On the other hand, no ZFC-FC bifurcation can be observed for the DUV-patterned Co:ZnO film after the vacuum annealing, suggesting that the uniformity of Co ion distribution inside ZnO lattice is improved by DUV-patterning.
Infrared Spectra of the 1-Chloromethyl-1-methylallyl and 1-Chloromethyl-2-methylallyl Radicals Isolated in Solid para-Hydrogen
(2017-11-23)
Amicangelo, Jay C.
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Lee, Yuan-Pern
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應用化學系
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應用化學系分子科學碩博班
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Department of Applied Chemistry
The reaction of chlorine atoms (Cl) with isoprene (2-methyl-1,3-butadiene, C5H8) in solid para-hydrogen (p-H-2) matrices at 3.2 K was studied using infrared (IR) spectroscopy. Mixtures of C5H8 and Cl-2 were codeposited in p-H-2 at 3.2 K, followed by irradiation with ultraviolet light at 36S nm to induce the photodissociation of Cl-2 and the subsequent reaction of the Cl atoms with C5H8. Upon 365 nm photolysis, a multitude of new lines appeared in the IR spectrum, and, based on the secondary photolysis behavior, it was determined that the majority of the new lines belong to two distinct chemical species, designated as set A (intense lines at 1237.9, 807.8, and 605.6/608.2 cm(-1), and several other weaker lines) and set B (intense lines at 942.4, 1257.7, 796.7/798.5, 667.9, and 569.7 cm(-1), and several other weaker lines). Quantum-chemical calculations were performed at the B3PW91/6-311++G(2d,2p) level for center dot C5H7 and the four possible isomers of the center dot C5H8Cl radicals, produced from the addition of the Cl atom to the four distinct sites of carbon atoms in C5H8, to determine the relative energetics and predict IR spectra for each radical. The newly observed lines of sets A and B are assigned to the 1-chloromethyl-2-methylallyl radical (addition to carbon 4) and the 1-chloromethyl-1-methylallyl radical (addition to carbon 1) according to comparison with predicted IR spectra of possible products. The 1-chloromethyl-2-methylallyl radical and 1-chloromethyl-1-methylallyl radicals were predicted to be the most stable, with the latter similar to 8 kJ mol(-1) lower in energy than the former. The ratio of the 1-chloromethyl-1-methylallyl to the 1-chloromethyl-2-methylallyl radicals is estimated to be (1.2 +/- 0.5):1.0, indicating that the two radicals are produced in approximately equal amounts. The exclusive production of the radicals involving the addition of the Cl atom to the two terminal carbons of isoprene is analogous to what was previously observed for the reaction of Cl atoms with trans-1,3-butadiene in solid p-H-2.
Internal current amplification induced by dielectric hole trapping in monolayer MoS2 transistor
(2017-11-24)
Liu, Pang-Shiuan
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Lin, Ching-Ting
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Hudec, Boris
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Hou, Tuo-Hung
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電子工程學系及電子研究所
Carrier transport in layered transition-metal dichalcogenides is highly sensitive to surrounding charges because of the atomically thin thickness. By exploiting this property, we report a new internal current amplification mechanism through positive feedback induced by dielectric hole trapping in a MoS2 back-gate transistor on a tantalum oxide substrate. The device exhibits an extremely steep subthreshold slope of 17 mV/decade, which is strongly dependent on the substrate material and drain bias. The steep subthreshold slope is attributed to the internal current amplification arising from the positive feedback between hole generation in MoS2 triggered by large lateral electric field and Schottky barrier narrowing induced by localized hole trapping in tantalum oxide near the source contact.
The optical properties of Ag2Te crystals from THz to UV
(2017-11-25)
Yeh, Tien-Tien
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Lin, Wen Hao
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Tzeng, Wen-Yen
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Le, Phuoc Huu
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Luo, Chih-Wei
The optical properties of monoclinic Ag2Te crystals are studied in a wide range (3.7 meV-6.2 eV) of photon energies. The measured reflectivity spectra from THz to UV allow unambiguous a photon energy-dependent complex dielectric function, complex refractive index and absorption coefficient to be obtained. The spectral structure in these optical parameters further indicates the coexistence of an indirect transition with a bandgap energy of about 10 meV and a direct transition with a bandgap energy of about 1.84 eV. (C) 2017 Elsevier B. V. All rights reserved.
僕人手冊之八
(2017-11-26)
顏維萱
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Department of Communication and Technology
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傳播與科技學系
僕人手冊，每一章都是一段生命的記憶。
認真過當下　講日文的台灣女生
(2017-11-26)
楊巧柔
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Department of Communication and Technology
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傳播與科技學系
在各類Youtube頻道竄出的時代，卻鮮少有日語相關影片。在台灣也無趣味性日語教學網站，因此政治大學日文系的學生Tiffany決定成立「講日文的台灣女生」，成為日文學習者的學習夥伴。
街藝狂響　城市裡的文藝風情
(2017-11-26)
黃珮瑄
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Department of Communication and Technology
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傳播與科技學系
2017街藝狂響活動邀請國內外街頭表演團體，在台南展開盛大的演出活動，吸引民眾參與。
地獄梗　迷因的黑暗分支
(2017-11-26)
陳映瑜
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Department of Communication and Technology
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傳播與科技學系
梗圖於社交平台上大量傳播，而卻有一部分的幽默是建立在他人苦痛之上，這些被稱為「地獄梗」。面對這些地獄梗，你笑了嗎？
WirForce2017　四天三夜瘋電競
(2017-11-26)
范晨星
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李哲君
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Department of Communication and Technology
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傳播與科技學系
亞洲最大的電競嘉年華WirForce 2017從11月23日到26日，四天三夜不斷電，舉行多項比賽和活動，各方電競好手齊聚一堂瘋電競。