Sally Liu - Academia.edu (original) (raw)

Papers by Sally Liu

Agu Fall Meeting Abstracts, Dec 1, 2009

The competition for land uses in China intensified during the rapid development of the last two d... more The competition for land uses in China intensified during the rapid development of the last two decades. The Jiangsu Province in the eastern China decided to develop a reclamation project in its coastal area in 2011. During the construction of highway and power plants, some geological and hydrological research work had been conducted but a lot of research questions about the tide-land interactions remain to be addressed. In China, researchers often use indoor experiments to simulate the coastal areas from river channel-aquifer interactions in laboratory. The dimensions of the experimental channels are, however, often limited to a small scale. In this study, we tried to use a natural river-aquifer system, with a relatively much larger scale compared to a laboratory channel-aquifer system, for simulation of the tide-land interactions. The study site is the Platte River near Kearney, Nebraska. An upstream reservoir released water cyclically and this water cycle is similar to the tidal process. Our study included direct-push techniques for permeameter tests to obtain the hydraulic conductivity of the streambed, monitoring the groundwater levels responding to daily changes of stream stages regulated by the upstream reservoir, and numerical modeling of the river-aquifer interactions. The soil layer and soil parameter analysis shows that the soil type and hydraulic conductivity at the study site are similar to the reclamation area in Nantong City of China. Thus the results from the Platte River site are applicable for simulating the flow dynamics and the groundwater level fluctuations caused by daily changes of tide level in the reclamation area. Other suggestions for dredger fill were put forward through the numerical simulation in the reclamation area.

Phys Lett a, 2010

The fluctuation conductivity under magnetic fields is studied in RFeAsO ( R=Nd,Pr,Sm) superconduc... more The fluctuation conductivity under magnetic fields is studied in RFeAsO ( R=Nd,Pr,Sm) superconductors reported in literatures within the lowest Landau level (LLL) scaling approach. The mean filed critical temperature T(H) is determined by the crossing point technique. With the determined values of T(H), the fluctuation conductivity is scaled within both three-dimensional (3D) and two-dimensional (2D) LLL approach. For all the samples studied, the 3D-LLL scaling is found but in a relatively small temperature interval around T(H), while 2D-LLL scaling is observed in all other temperature region. These results suggest a 3D-2D crossover of the fluctuation conductivity in RFeAsO superconductors.

The non-sequential parameter estimation procedures used to process historical data generally negl... more The non-sequential parameter estimation procedures used to process historical data generally neglect the possibility that model parameters change over time. Sequential parameter estimation procedures, however, can detect possible temporal variability of key parameters of models so that researchers can identify possible structural errors in the models. In this study, we used Smoothed Ensemble Kalman Filter (SEnKF) methods to sequentially assimilate

Stud Surf Sci Catal, 2004

A novel method for preparing ordered replicated mesoporous-microporous composite materials (RMM) ... more A novel method for preparing ordered replicated mesoporous-microporous composite materials (RMM) using carbon mesoporous molecular sieves as template is reported. In particular, the novel aluminosilicate material (RMM-1), synthesized by replication of carbon mesoporous molecular sieve CMK-1 using ZSM-5 zeolite precursor, is found to possess a structure analogous to MCM-48 molecular sieve.

Agu Fall Meeting Abstracts, Dec 1, 2005

Flux transfer event (FTE) is a magnetic tube-like construction resulted from patchy and transient... more Flux transfer event (FTE) is a magnetic tube-like construction resulted from patchy and transient reconnection between interplanetary magnetic field (IMF) and magnetospheric field at dayside magnetopause. This paper analyses the magnetic data observed by the first Double Star spacecraft (TC-1) and Cluster II during February to April 2004 when they crossed dayside magnetopause many times at the same time in different latitudes, TC-1 near by the equator and Cluster II close to the cusp region, and 20 FTEs had been detected. Researching the structure of IMF when these FTEs were observed by spacecraft, we found following results: (1) when IMF southward component Bz is dominate, 75 percent of FTEs was detected by TC-1, and 25 percent by Cluster; (2) when IMF By component is dominate, only 17 percent of FTEs was observed by TC-1, and 83 percent by Cluster; (3) when the magnitude of IMF By and Bz southward component were about equal, the number of FTEs detected by TC-1 and Cluster is roughly the same. Above mentioned facts imply that the magnetic reconnection occurred mainly at the low latitude (near the equator) when IMF southward component Bz is dominate and By is smaller, and the magnetic reconnection may occur at the cusp region frequently when IMF By is dominate. And so the magnetic reconnection can occur not only at the cusp region but also at the low latitude when IMF By and southward component Bz both are striking, at this time the coupling between solar wind and magnetosphere was stronger. In addition two FTEs observed by TC-1 at 03:07 UT on 25th February has also been detected by Cluster near the cusp after about 500s. By means of DeHoffmann-Teller Analysis (HTA) we got the speed of this FTE, the transit time from TC-1 to Cluster can derive from this speed. The result shows that the delay in magnetic records of TC-1 and Cluster is about the same with transit time. In addition to the IMF |By/Bz|=0.19, this imply IMF Bz is dominate in that time. These signified that this two FTEs by Cluster at 03:17 UT on 25th February may be born at low latitude, and then moved to the cusp region. In view of above-mentioned the FTEs observed by Cluster, part of them were born in the locality and the other may be born at low latitude then moved to the cusp region. Taking this account the occurrence of magnetic reconnection is quite difficult near cusp region when IMF By component is very small.

2015 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC), 2015

2006 IEEE MTT-S International Microwave Symposium Digest, 2006

The low-loss single semi-coaxial (S-SC) and differential semi-coaxial (D-SC) interconnects based ... more The low-loss single semi-coaxial (S-SC) and differential semi-coaxial (D-SC) interconnects based on a standard 0.18-mum CMOS process are presented for the first time. Compared to the attenuation constant (alpha) reported for microstrip and CPW interconnects in CMOS process, the S-SC line shows the lowest loss of 0.90 dB/mm at 50 GHz. The D-SC line also presents a very low differential-mode

IEEE VLSI-TSA International Symposium on VLSI Technology, 2005. (VLSI-TSA-Tech)., 2005

ABSTRACT In this work, we investigate the distorted C-V characteristics for MOSFETs with ultra-th... more ABSTRACT In this work, we investigate the distorted C-V characteristics for MOSFETs with ultra-thin gate oxide. We propose a scalable BSIM4-based macro model to simulate the anomalous C-V behavior. Based on the model, we develop a methodology to extract the true MOS capacitance.

Proceedings of the IEEE 2005 Custom Integrated Circuits Conference, 2005., 2005

2007 Asia and South Pacific Design Automation Conference, 2007

2009 IEEE Radio Frequency Integrated Circuits Symposium, 2009