Browsing by Issue Date, starting with "2018-09-26"

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Selective probe of coherent polar phonon and quasiferromagnetic resonance modes in multiferroic GdFeO3
(2018-09-26)
Sheu, Y. M.
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Ogawa, N.
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Tokunaga, Y.
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Chan, H. C.
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Tokura, Y.
Using time-resolved second harmonic generation (TRSHG) and optical transmission, we demonstrate simultaneous optical access to both magnetic and ferroelectric order parameters in a magnetoelectric multiferroic GdFeO3 below the transition temperature 2.2 K. In magnetoelectric phase, the pump pulses impulsively generate polar phonon modes of B-2 and A(1) symmetry and a quasiferromagnetic resonance mode, creating coherent lattice and spin motions. While collective motions associated with the ferroelectric and antiferromagnetic ordering are simultaneously excited, only the polar motion is detected in TRSHG, resulting in a direct subpicosecond excitation of the improper ferroelectric order. Our result also experimentally indicates that the soft mode in improper ferroelectrics is IR inactive above the phase transition, unlike proper ferroelectrics. Furthermore, we investigate the crystal polar symmetry and potential coupling between the polar phonons and the quasiantiferromagnetic resonance mode, which can shed light on the studies of subpicosecond magnetoelectric coupling based on collective quasiparticle excitations.
Direct IR Absorption Spectra of Propargyl Cation Isolated in Solid Argon
(2018-09-26)
Chin, Chih-Hao
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Lin, Meng-Yeh
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Huang, Tzu-Ping
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Wu, Pei-Zhen
;
Wu, Yu-Jong
The direct infrared (IR) absorption spectra of propargyl cations were recorded. These cations were generated via the electron bombardment of a propyne/Ar matrix sample during matrix deposition. Secondary photolysis with selected ultraviolet (UV) light was used for grouping the observed bands of various products. The band assignment of the propargyl cation in solid Ar was performed according by referring to the previous infrared photodissociation (IRPD) and velocity-map imaging photoelectron (VMI-PE) data, and via theoretical predictions of the anharmonic vibrational wavenumbers, band intensities, and deuterium-substituted isotopic ratios. Almost all the IR active bands with an observable intensity were recorded and the nu(11) mode was reported for the first time.
Au-Cd1-xZnxS core-alloyed shell nanocrystals: boosting the interfacial charge dynamics by adjusting the shell composition
(2018-09-28)
Pu, Ying-Chih
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Chen, Wei-Ta
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Fang, Mei-Jing
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Chen, Yu-Lin
;
Tsai, Kai-An
Au-Cd1-xZnxS core-shell nanocrystals (NCs) with controllable shell compositions (from x = 0 to x = 0.37) were synthesized by using the hot-injection method. By increasing the mole fraction of ZnS in the Cd1-xZnxS shell, the conduction band of Cd1-xZnxS can be cathodically shifted to cause an increase of energy difference between the conduction band level of the Cd1-xZnxS shell and the Fermi level of the Au core, thereby enlarging the driving force of interfacial electron transfer to enhance the photoelectrochemical (PEC) efficiency. The interfacial charge dynamics of the samples were examined by time-resolved photoluminescence (TRPL) spectroscopy. The results showed that the interfacial electron transfer rate constant (k(et)) from the Cd1-xZnxS shell to the Au core was increased by 2 orders of magnitude, from 2.41 x 10(7) to 4.91 x 10(9) s(-1) as the mole fraction of ZnS increased from 0 to 0.37. Furthermore, PEC characterization, including Mott-Schottky analysis and photovoltage decay measurements, illustrated that gradually introducing ZnS into the shell composition of Au-Cd1-xZnxS NCs can modify the band structure and enhance the effectiveness of interfacial ET for advancing the PEC properties. The practical use of Au-Cd1-xZnxS NCs in PEC methanol oxidation was also demonstrated, revealing their promising potential as viable photoelectrodes for various PEC applications. The present study delivers an alternative approach of modulating the interfacial ET dynamics of core-shell MSNs by means of shell composition adjustment. The illustrations provide an empirical guideline to the intelligent design of core-shell metal-semiconductor nanoheterostructures (MSNs) for the desired PEC applications.
天生鍊金術師　耐金屬貪銅菌
(2018-09-30)
黃淳妤
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Department of Communication and Technology
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傳播與科技學系
科學家近日釐清了細菌將重金屬轉變為黃金的方式，比起目前常用的提煉法，對環境的傷害大幅減輕，甚至促進自然循環，有望成為新的貴金屬提煉方式。
你願意當「江南美人」嗎？
(2018-09-30)
顏筱娟
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Department of Communication and Technology
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傳播與科技學系
《我的ID是江南美人》一部對於整容、社會性別期望探討的韓國電視劇。
上司不理性對待　該報復或容忍
(2018-09-30)
翁邦晏
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Department of Communication and Technology
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傳播與科技學系
2018年9月24日第28次第一屆搞笑諾貝爾獎頒獎，本次經濟學獎由研究「以巫毒娃娃對不理性對待下屬的上司進行報復」獲得殊榮。究竟報復巫毒娃娃、不理性的監督者與經濟之間有什麼關聯呢？
受創牙齒獲新生　幹細胞新革命
(2018-09-30)
許家芸
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Department of Communication and Technology
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傳播與科技學系
牙齒受傷、壞掉了是不是很讓人傷心難過？現在不用擔心了，今年八月學者證實利用幹細胞的移植能讓蛀牙重獲生機，讓我們一起來看看究竟是怎麼一回事！
動物馴化　原來和基因有關
(2018-09-30)
洪蜜禪
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Department of Communication and Technology
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傳播與科技學系
自古以來，人類馴養多種動物作為寵物或家禽，是什麼原因造成這些動物願意溫馴地待在人類身邊，成為人類的朋友呢？原來跟基因有很大的關聯。
總編輯的話
(2018-09-30)
王允妍
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Department of Communication and Technology
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傳播與科技學系
本期為喀報295期，共計28篇稿件。本期頭題為《愛上謊言的女人　愛在虛實之間》，透過《愛上謊言的女人》及《怒》兩部電影的比較與分析，探討愛情之下「信任」的本質。
善與惡的化身　醃黃瓜先生
(2018-09-30)
殷顗霖
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Department of Communication and Technology
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傳播與科技學系
《醃黃瓜先生》為美國近年著名的黑色幽默卡通，內容充滿暴力、血腥、性行為的元素，甚至是惡魔崇拜的情節。這隻有如魔鬼一般的邊境牧羊犬，是如何在荒唐的小鎮裡，實行牠的原則呢？
愛上謊言的女人　愛在虛實之間
(2018-09-30)
郭玟妤
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Department of Communication and Technology
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傳播與科技學系
我愛你，但我可以相信你嗎？透過電影《愛上謊言的女人》／《怒》，一窺「信任」與「懷疑」之間的赤裸拉鋸。
Mr.One　玩出樂器品牌新高度
(2018-09-30)
鄒典儒
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Department of Communication and Technology
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傳播與科技學系
Mr.One 王萬沂，年僅23歲，已邁入創業之路第三年。自創台灣手工木箱鼓品牌「Mr.One Cajon」，第一家實體店面於去年11月在竹北市新瓦屋客家文化園區盛大開幕。
瘋狂亞洲富豪　現代灰姑娘故事
(2018-09-30)
李欣秝
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Department of Communication and Technology
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傳播與科技學系
睽違25年，繼1993年《喜福會》後，好萊塢再次推出全亞裔演員的浪漫愛情喜劇。這部包含東、西方多元文化的電影究竟會激盪出什麼樣的火花？
咖啡的「獨立」宣言
(2018-09-30)
程安瑜
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Department of Communication and Technology
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傳播與科技學系
喝咖啡已然成為台灣日常生活中不可或缺的文化，然而現在卻多變成追求功能或時尚的象徵，其實喝咖啡可以是很有溫度的。獨立咖啡廳的成立，便是想透過手沖咖啡，帶給台灣咖啡文化多一點人情味。
匿名式問卷熱潮　你跟上了嗎？
(2018-09-30)
陳儀軒
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Department of Communication and Technology
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傳播與科技學系
探討上半年風行於臉書以及Instagram的匿名式問卷，分析匿名式問卷使用者的心理以及類型。運用創新擴散模式、使用與滿足理論加以佐證，究竟風潮盛行的背後，是要傳遞什麼樣的社會現象呢？
百「蚊」不如不見　基改滅蚊
(2018-09-30)
李庭安
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Department of Communication and Technology
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傳播與科技學系
近期，科學家透過基因改造，成功限制實驗室內蚊子樣本的繁衍。然而，這會是好事還是壞事？此篇將談論此實驗原理，以及探討未來影響。
意外之後　宣洩底下的溫柔
(2018-09-30)
蘇嘉薇
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Department of Communication and Technology
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傳播與科技學系
一名年輕女子慘遭姦殺，鎮上的警察卻遲遲未抓到兇手。女孩的母親如何面對喪女之痛？一切都要從三塊廣告牌說起。
性別不「色」限　藍與粉紅
(2018-09-30)
許可晴
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Department of Communication and Technology
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傳播與科技學系
我們靠衣服的顏色分辨新生兒的性別，覺得男生穿粉紅色就是「娘」，隨著時代改變，「男藍女粉」還是不變的法則嗎？
陳祖寧的影像創作之路
(2018-09-30)
姚璇
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Department of Communication and Technology
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傳播與科技學系
面對新媒體產業，陳祖寧秉持著專業和熱忱，不斷地精進自己。
《平凡的一天》　簡單而不易
(2018-09-30)
陳盈璇
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Department of Communication and Technology
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傳播與科技學系
人生就是不停地在平凡中追逐不凡，但最終我們最渴望的又是什麼呢？今年夏天，讓我們聽著毛不易的全新專輯《平凡的一天》，用專屬於他的溫暖，訴說著我們簡單而嚮往的生活。