6,011 research outputs found
Determination of the strong coupling from hadronic tau decays using renormalization group summed perturbation theory
We determine the strong coupling constant \alpha_s from the \tau hadroni
width using a renormalization group summed (RGS) expansion of the QCD Adler
function. The main theoretical uncertainty in the extraction of \alpha_s is due
to the manner in which renormalization group invariance is implemented, and the
as yet uncalculated higher order terms in the QCD perturbative series. We show
that new expansion exhibits good renormalization group improvement and the
behaviour of the series is similar to that of the standard CIPT expansion. The
value of the strong coupling in {\bar{\rm MS}} scheme obtained with the RGS
expansion is \alpha_s(M_\tau^2)= 0.338 \pm 0.010. The convergence properties of
the new expansion can be improved by Borel transformation and analytic
continuation in the Borel plane. This is discussed elsewhere in these
proceedings.Comment: Contribution to the proceedings of the workshop "Determination of the
Fundamental Parameters of QCD", Nanyang Technological University, Singapore,
18-22 March 2013, to be published in Mod. Phys. Lett. A, version 2 contains
an extra footnote and a reference compared to version
Limits on the Benefits of Energy Storage for Renewable Integration
The high variability of renewable energy resources presents significant
challenges to the operation of the electric power grid. Conventional generators
can be used to mitigate this variability but are costly to operate and produce
carbon emissions. Energy storage provides a more environmentally friendly
alternative, but is costly to deploy in large amounts. This paper studies the
limits on the benefits of energy storage to renewable energy: How effective is
storage at mitigating the adverse effects of renewable energy variability? How
much storage is needed? What are the optimal control policies for operating
storage? To provide answers to these questions, we first formulate the power
flow in a single-bus power system with storage as an infinite horizon
stochastic program. We find the optimal policies for arbitrary net renewable
generation process when the cost function is the average conventional
generation (environmental cost) and when it is the average loss of load
probability (reliability cost). We obtain more refined results by considering
the multi-timescale operation of the power system. We view the power flow in
each timescale as the superposition of a predicted (deterministic) component
and an prediction error (residual) component and formulate the residual power
flow problem as an infinite horizon dynamic program. Assuming that the net
generation prediction error is an IID process, we quantify the asymptotic
benefits of storage. With the additional assumption of Laplace distributed
prediction error, we obtain closed form expressions for the stationary
distribution of storage and conventional generation. Finally, we propose a
two-threshold policy that trades off conventional generation saving with loss
of load probability. We illustrate our results and corroborate the IID and
Laplace assumptions numerically using datasets from CAISO and NREL.Comment: 45 pages, 17 figure
The form factors from Analyticity and Unitarity
Analyticity and unitarity techniques are employed to obtain bounds on the
shape parameters of the scalar and vector form factors of semileptonic
decays. For this purpose we use vector and scalar correlators evaluated in
pQCD, a low energy theorem for scalar form factor, lattice results for the
ratio of kaon and pion decay constants, chiral perturbation theory calculations
for the scalar form factor at the Callan-Treiman point and experimental
information on the phase and modulus of form factors up to an energy
\tin=1 {\rm GeV}^2. We further derive regions on the real axis and in the
complex-energy plane where the form factors cannot have zeros.Comment: 6 pages, 5 figures; Seminar given at DAE-BRNS Workshop on Hadron
Physics Bhabha Atomic Research Centre, Mumbai, India October 31-November 4,
2011, submitted to Proceeding
Penerapan Metode Moving Average (MA) Berbasis Algoritma Support Vector Machine (SVM) untuk Membandingkan Pola Kurva dengan Trend Kurva pada Trading Forex Online
Bursa valuta asing atau forex adalah tempat dimana mata uang dari suatu negara diperdagangan dengan mata uang negara lainnya. Perdagangan berlangsung secara global antara pusat-pusat keuangan dunia, dengan melibatkan bank-bank utama dunia sebagai pelaksana utama transaksi. Trader yang melakukan investasi di pasar valuta asing dituntut untuk memiliki kemampuan menganalisis keadaan dan situasi dalam memprediksi nilai tukar mata uang. Pergerakan harga forex atau saham yang membentuk kurva sangat membantu para trader dalam pengambilan keputusan, pergerakan kurva dijadikan sebagai salah satu indikator dalam pengambilan keputusan untuk beli (buy) atau jual (sell). Penelitian ini menggunakan algoritma Support Vector Machine (SVM) untuk membandingkan pola kurva, kemudian dataset dari algoritma SVM diproses menggunakan metode Moving Average (MA) untuk membentuk kurva kedua. Hasilnya trend kurva yang dihasilkan algoritma Support Vector Machine dan Metode Moving Average membentuk kurva yang sama dengan kurva live online pada GBPUSD, 1H
THE CATASTROPHIC OPEN WOUND: THE APPLICATION OF COMPLEX POST-TRAUMATIC STRESS DISORDER IN LINDA HOGAN’S SOLAR STORMS AND EDEN ROBINSON’S MONKEY BEACH
This thesis argues that Judith Herman\u27s theory of Complex Post-Traumatic Stress Disorder can provide a lot of insight in analyzing the trauma of several characters in Linda Hogan’s Solar Storms and Eden Robinson’s Monkey Beach. The analysis first employs the two authors’ Native American ideas of trauma and then adds Herman’s theory of CPTSD to help bridge the gap between the Native American and Western cultures and to create more understanding without undermining cultural differences.
I chose Herman’s theory for my analysis because it has many commonalities with the Native American trauma theories such as belief in the fact that trauma can be ongoing and chronic and that it can have catastrophic consequences extending to multiple families, communities, and generations. The other reason that I believe Herman’s theory is a good fit for my exploration of the Native American characters in these two novels is because her ideas regarding healing and recovery come very close to Hogan and Robinson’s with these two authors’ emphasis on the importance of re-establishing lost familial and communal ties, resisting all forms of oppression, be it private or public, civil or political, and narrating one’s story of trauma and survival in order to situate it in the larger frame of the Native American peoples’ fight for justice and recognition
Penerapan Metode Weighted Product (WP) Berbasis Sistem Pengambilan Keputusan Untuk Pemberian Dana Bantuan Mandiridesa Wisata Pada Dinas Perhubungan Pariwisata Kabupaten Bone Bolango
- The Ministry of Tourism and Creative Economy implemented PNPM Mandiri Tourism Sector which entered the fifth year to support Tourism development activities through Community Empowerment in the tourist village. The support Decisioned by Tourism Transport Agency was not effective to set Desa Wisata which possibel to receive the PNPM support program. Its affects to the tourism business improvement of districts bone Bolango which inhibited. The support for society Desa Wisata through PNPM Mandiri program, Must meet the criteria. Such Potential criteria lay Desa Wisata must have the uniqueness and appeal of Tourism (as a tourist attraction), either form character of physical environment rural nature and socio-cultural Community, have support and readiness have been worn supporting for tourism. For a review of the support the matter as above will designed a decision support system using method weihgted product Interest to boost business tourism in the district Bone Bolango because supported by the best result of decision support
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