A new design of a microstrip-line-fed circularly polarized printed ring slot antenna is proposed. Circular polarization (CP) radiation the proposed achieved by introducing proper asymmetry in structure and feeding using microstrip line at 45/spl deg/ from introduced asymmetry. The meandered-slot section CP can be applied to square annular antennas. Prototypes have been implemented. Experimental results show that good performances are obtained 3 dB axial-ratio bandwidths for antennas about...

The 1999 Chi-Chi earthquake was caused by rupture of the Chelungpu fault, one most prominent active thrust faults Taiwan. This largest Taiwan's historical fault ruptures broke surface for over 90 km at western base rugged mountain range. A short right-lateral tear extended southwestward from southern end and a complex assemblage shallow folds ran northeastward northern end. Vertical offsets averaged about 2 m along half 4 half, 5 to 7 were typical part major thrust. sinuous nature trace is...

Research Article| June 01, 2015 Old continental zircons from a young oceanic arc, eastern Taiwan: Implications for Luzon subduction initiation and Asian accretionary orogeny Wen-Yu Shao; Shao 1Department of Geosciences, National Taiwan University, Taipei 10617, Search other works by this author on: GSW Google Scholar Sun-Lin Chung; Chung * Taiwan2Institute Earth Sciences, Academia Sinica, 11529, *E-mail: sunlin@ntu.edu.tw Wen-Shan Chen; Chen Hao-Yang Lee; Lee Lie-Wen Xie 3Institute Geology...

The Yuli metamorphic belt has been the topic of petrological and geochronological studies for over 40 years interpreted as a Cretaceous mélange. Our study utilizes zircon U-Pb dating schist exotic blueschist blocks in belt. These new ages indicate that these rocks are actually middle Miocene age may represent deeper structural levels an accretionary prism. Several distinctive detrital populations recognized from 14 siliceous schists mélange-hosted similar population to Cretaceous,...

The Longitudinal Valley fault is a key element in the active tectonics of Taiwan. It principal structure accommodating convergence across one two sutures Taiwan orogeny. To understand more precisely its role suturing process, we analyzed fluvial terraces along Hsiukuluan River, which cuts Coastal Range eastern fault's hanging wall block. This allowed us to determine both subsurface geometry and long‐term slip rate. uplift pattern consistent with fault‐bend fold model. Our analysis yields...

Discrete scarps that are created or reactivated during large earthquakes a locus of concentrated hazard. A number the coseismic activated in 1999 Chi‐Chi earthquake actually fold scarps, which display several types ground deformation characterized by localized folding and distinct from classic fault form cutting surface. This paper documents analyzes formed Taiwan earthquake. Our results show can be generally divided into two types: (1) those associated with ahead tip blind thrust at shallow...

Research Article| October 01, 2001 Stratigraphic architecture, magnetostratigraphy, and incised-valley systems of the Pliocene-Pleistocene collisional marine foreland basin Taiwan Wen-Shan Chen; Chen 1Department Geology, National University, 245 Choushan Road, Taipei, Taiwan, Republic China Search for other works by this author on: GSW Google Scholar Kenneth D. Ridgway; Ridgway 2Department Earth Atmospheric Sciences, Purdue West Lafayette, Indiana 47907-1397, USA Chorng-Shern Horng; Horng...

We relocated 6,173 shallow earthquakes and determined focal mechanism solutions of thirty-three M 5.0 L ≥ events in the eastern Taiwan region (bounded by 22.7°N, 120.8°E; 24.5°N, 121.5°E; 24.3°N, 122.3°E 22.5°N, 121.6°E) order to investigate their tectonic implications.Our results suggest that distribution generally agrees with fault plane from solutions.The Longitudinal Valley (LV) is an east-dipping seismic suture zone separates two different regions.On left-hand side LV, normal fault-type...

Research Article| October 01, 2001 1999 Chi-Chi Earthquake: A Case Study on the Role of Thrust-Ramp Structures for Generating Earthquakes Wen-Shan Chen; Chen Search other works by this author on: GSW Google Scholar Bor-Shouh Huang; Huang Yue-Gau Yuan-Hsi Lee; Lee Chao-Nan Yang; Yang Ching-Hua Lo; Lo Hui-Cheng Chang; Chang Quo-Cheng Sung; Sung Neng-Wei Chin-Cheng Lin; Lin Shih-Hua Kun-Jie Author and Article Information Publisher: Seismological Society America First Online: 03 Mar 2017 Online...

Late Quaternary rupture behavior of large earthquakes along the Yingxiu-Beichuan fault and Longmen Shan zone has been focus geoscientists since 2008 Wenchuan earthquake. However, most studies have concentrated on southern segment from Yingxiu to Beichuan. Here we opened trenches used borehole drilling in Guixi Pingxi northern (north Beichuan) with following paleoseismic results: (1) Trenches at reveal that least one event occurred prior earthquake ages 770–955 A.D. 665–1030 determined two...

The geomorphic expression of the frontal Western Foothills in central Taiwan is usually defined by a late Holocene scarp that ranges from tens to hundreds meters height.This product displacement on near-surface 20-30Њ east-dipping thrust fault, Chelungpu which ruptured during Chichi earthquake.The large height may correspond directly accumulation successive surface ruptures.The Chushan site located southern part this fault where earthquake produced with 1.7-m vertical offset for total...

This paper presents an Inverted-F Antennas (IFAs) type MIMO antenna with Wi-Fi and Blue-Tooth band for smart watch application. The overall dimensions of 40×40×5.4 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> the proposed design consisting portion 40×5×0.1 system ground 40×40×0.4 . geometry is composed two identical IFA antennas extended from side ground, which designed on FR4 substrate. distance between both 40 mm. measured...

The Tananao Schist Belt is a low-pressure metamorphic complex comprised of three lithological units marble, schist formation, and granite, in ascending order proportion. Previous studies have found that the formation was formed during Mesozoic. However, there lack geochronological data to corroborate protolith ages. In this study, we used UPb zircon geochronology provide time frame for creation metamorphism, as well new tectonic model. Twenty-three eleven meta-magmatic samples were dating by...

Mechanisms for interpreting anomalous decreases in radon ground water prior to earthquakes are examined with the help of a case study show that potentially is sensitive tracer strain changes crust preceding an earthquake. The 2003 Chengkung earthquake magnitude (M) 6.8 on December 10, 2003, was strongest near area eastern Taiwan since 1951. Antung radon-monitoring station located 20 km from epicenter. Approximately 65 d earthquake, precursory concentration were observed. Specifically,...

This paper reports for the first time zircon U-Pb ages of volcanic rocks and sands from Lutao Lanyu, two islets off SE Taiwan in north Luzon arc.The samples include (1) seven andesites four units three river/beach (2) five basaltic Lanyu.The contain abundant magmatic zircons, aging ~1.54 to ~1.24 Ma individual sample, which yielded an overall mean 206 Pb/ 238 U age 1.31 ± 0.03 (n = 190, MSWD 2.6).This is slightly older than, or broadly coincident with, a 1.23 103, 1.9) given by detrital...

A growing number of higher education institutions have adopted asynchronous and synchronous Web-based learning platforms to improve students' efficiency increase satisfaction in the past decade. Unlike traditional face-to-face methods, e-learning allow teachers communicate with students discuss course content anytime or anywhere. In addition, teaching material can be reused via platforms. To understand how use what implications are, we conducted an empirical study iCAN platform, which has...

Research Article| February 01, 2002 Geomorphic evidence for prior earthquakes: Lessons from the 1999 Chichi earthquake in central Taiwan Yue-Gau Chen; Chen 1Department of Geosciences, National University, 245 Choushan Road, Taipei 106, Taiwan, Republic China Search other works by this author on: GSW Google Scholar Wen-Shan Yuan Wang; Wang Po-Wen Lo; Lo Tsung-Kwei Liu; Liu Jian-Cheng Lee 2Institute Earth Science, Academia Sinica, P.O. Box 1-55, Nankang, Taipei, Author and Article Information...