97,976 research outputs found
Data for: Developing Large-Scale Energy Storage to Alleviate a Low-Carbon Energy Bubble
No full textThese data and simulation files are available to reviewers right now, and will be available to reader once this paper get accepted
Data for: Developing Large-Scale Energy Storage to Alleviate a Low-Carbon Energy Bubble
No full textThese simulation and data files are available to reviewers right now, and will be available to readers once the paper gets published
Nanostructure and Chemistry in Confined Spaces (3/3)
No full textProject Serial No.: NSC 92-2113-M-002-005
Project Term: 8/1/2003--7/31/2004 (third year)
Principal Investigators:
Chung-Yuan Mou, Dept. of Chemistry & CCMR, National Taiwan University, Taiwan
Shang-Bin Liu, IAMS, Academia Sinica, Taiwan
John S. Tse, SIMS, National Research Council, Canada
John A. Ripmeester, SIMS, National Research Council, Canada
Yu Wang, Dept. of Chemistry, National Taiwan University, Taiwan
Abstract
The objective of this three-year research
proposal is to adopt a multi-disciplinary
approach combining theoretical and
experimental probes to study chemistry in
confined spaces, especially in the nanometer
scale. Recent developments in the synthesis
of mesoporous aluminosilicates provide a
unique opportunity to exploit nanopores as
chemical vessels. The uniform mesoporous
materials, such as M41S, SBA etc. with a
controllable narrow pore size distribution are
ideal media for the study of structure and
properties on the nanoscale. The
amalgamation of complementary research
expertise from the Canadian and Taiwan
scientists is a key element for the success of
the proposed research. Three independent but
closely related projects are proposed:
(A) Phase Transformations in Nano-channels:
Ga Confined in MCM-41.
(B) Structure and Luminescence of Quantum
Confined Semiconductors: Surface
Structure and Its Defects.
(C) Implementation, Development and
Application of Hyperpolarized Xenon on
the Physical-Chemical Properties of
Porous Materials.
(D) Study dynamics of supercooled confined
water by Neutron scattering.(QENS)
The outcome of this research should be beneficial to the fabrication, formation
mechanism and future applications of the
novel nano-scaled electrical-optical devices.
Furthermore, the development and
fabrication of HP-129 Xe should not only
useful for characterizing properties of surface
modified/functionalized porous materials but
also facilitates future syntheses and
applications of novel nanostructured
materials with engineered properties
Terahertz hyper-Raman time-domain spectroscopy of gallium selenide and its application in terahertz detection
No full textWe report the observation of Terahertz (THz) hyper-Raman generation in a gallium selenide crystal. This nonlinear optical process derives from the four- and five-wave-mixing of femtosecond optical pulses and intense, subps, broadband terahertz pulses. The wavelength spectrum of the resulting signal displays two pronounced frequency sidebands close to the optical second-harmonic central frequency 2 ω L, where ωL is the optical central frequency of the fundamental beam. The two sidebands develop around the central frequency at the (anti-) Stokes side of ω s, a = 2 ω L ω T, where ωT is the THz central frequency. This nonlinear optical process is used for the coherent detection of intense and broadband terahertz waves. The proposed technique shows a good linear response of up to 90 kV/cm and a better efficiency in detecting the lowest terahertz frequencies, as compared to the standard electro-optic sampling performed in two different nonlinear crystals
Broadband Terahertz Spectroscopy of Imidazolium-Based Ionic Liquids
No full textIonic liquids are liquid salts at ambient temperature composed of organic cations and organic/inorganic anions. Outstanding physical and chemical properties of ionic liquids lead to increasing application in scientific and industrial field. Ionic liquids have been already investigated by different spectroscopic techniques, including terahertz (THz) time-domain spectroscopy. The usual THz frequency range extends up to 2-3 THz, a relatively narrow band, which can only show the intermolecular vibrational modes. Here, we report about broadband THz spectroscopy of ionic liquids up to 13 THz. Bandwidth of intermolecular absorption band presents an unexpected behavior and strong sharp intramolecular absorptions are shown. In addition, we found violation of the approximation of harmonic oscillator used to predict the peak shift of intermolecular absorption band
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Production experiences and market structure in R&D competition
No full textIn the R&D race the incumbent enjoys an advantage of learning from production
experiences, but this important feature has not been incorporated into existing studies.
Assuming that the technological knowledge is accumulated not only by R&D expenditures but
also by production experiences, we study the properties of optimal investment strategies in a
model with an incumbent & many identical challengers. After proving the existence of a
unique Nash equilibrium in the R&D race, we demonstrate analytically that the likelihood of
persistent leadership increases with production experiences of the incumbent but decreases
with the number of challengers. Numerical analyses also establish that (i) the challengers
always invest more than the incumbent & the difference increases with production
experiences, the flow of monopoly profits & the number of challengers; & (ii) the
likelihood of persistent leadership increases with the value of being the winner & the value of being a loser but decreases with expected waiting time of R&D innovation & the flow of
monopoly profits. However, destructive innovations may still occur even when production
experiences are allowed to play an important role in the R&D competition
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Keefektifan Kalimat dalam Memorandum Of Understanding (MoU) SDN 1 Bengkalis
No full textSalah satu jenis alat perhubungan adalah Surat Perjanjian Kerja Sama. Bahasa yang digunakan dalam surat perjanjian kerjasama atau MoU harus menggunakan bahasa Indonesia yang baik dan benar. Namun, kalimat yang tidak efektif ternyata juga dijumpai dalam MoU SDN 1 Bengkalis, padahal surat ini bersifat resmi. Jika dalalam surat perjanjian tersebut menggunakan kalimat yang tidak efektif, maka penafsiran atau pemaknaan dari perjanjian tersebut tidak akan sama dan menimbulkan kesalahpahaman. Metode yang digunakan dalam penelitan ini adalah deskriptif kualitatif. Teknik pengumpulan data dalam penelitian ini yaitu membaca, mengamati, dan menandai. Teknik analisis data dengan cara mengidentifikasi, menganalisis, menyimpulkan, dan menulis hasil laporan penelitian. Setelah melakukan analisis terhadap kalimat yang dipakai dalam MoU SDN 1 Bengkalis, dari 105 kalimat ditemukan 68 data yang tidak memenuhi syarat keefektifan kalimat. Ketidakefektifan kalimat tersebut meliputi ketidaktepatan penalaran sebanyak 5 kasus, ketidaktepatan tata bahasa sebanyak 26 kasus, ketidaktepatan kata sebanyak 5 kasus, dan ketidaktepatan lafal & ejaan sebanyak 32 kasus. Dari hasil temuan ini dapat diketahui bahwa kalimat yang dipakai dalam MoU SDN 1 Bengkalis tidak sepenuhnya efektif, sehingga perlunya perbaikan yang dilakukan untuk menyempurnakan MoU tersebut
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