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 KπK\pi 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 $K_{l3}$ 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 $K\pi$ 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

Islamic Law in the Legal Political System

This article discusses the history of the development of Islamic law in the legal political system in Indonesia. The problem discussed in this article is how the history of the phases of Islamic law in Indonesia and how the formation of Islamic law in the development of the political system in Indonesia. The results showed that: First, the history of the development of Islamic law in Indonesia, namely from the pre-colonial period of the Netherlands, the Dutch colonial period, the period of Japanese occupation, the period of parliamentary democracy, the old and new order periods, and the reform period; Second, the position of Islamic law in the development of national law in Indonesia plays an important role in the orderliness of the Indonesian people, especially Muslims and is used as material in the preparation of national la

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

Theory of unitarity bounds and low energy form factors

We present a general formalism for deriving bounds on the shape parameters of the weak and electromagnetic form factors using as input correlators calculated from perturbative QCD, and exploiting analyticity and unitarity. The values resulting from the symmetries of QCD at low energies or from lattice calculations at special points inside the analyticity domain can beincluded in an exact way. We write down the general solution of the corresponding Meiman problem for an arbitrary number of interior constraints and the integral equations that allow one to include the phase of the form factor along a part of the unitarity cut. A formalism that includes the phase and some information on the modulus along a part of the cut is also given. For illustration we present constraints on the slope and curvature of the K_l3 scalar form factor and discuss our findings in some detail. The techniques are useful for checking the consistency of various inputs and for controlling the parameterizations of the form factors entering precision predictions in flavor physics.Comment: 11 pages latex using EPJ style files, 5 figures; v2 is version accepted by EPJA in Tools section; sentences and figures improve

Human-activity-centered measurement system:challenges from laboratory to the real environment in assistive gait wearable robotics

Assistive gait wearable robots (AGWR) have shown a great advancement in developing intelligent devices to assist human in their activities of daily living (ADLs). The rapid technological advancement in sensory technology, actuators, materials and computational intelligence has sped up this development process towards more practical and smart AGWR. However, most assistive gait wearable robots are still confined to be controlled, assessed indoor and within laboratory environments, limiting any potential to provide a real assistance and rehabilitation required to humans in the real environments. The gait assessment parameters play an important role not only in evaluating the patient progress and assistive device performance but also in controlling smart self-adaptable AGWR in real-time. The self-adaptable wearable robots must interactively conform to the changing environments and between users to provide optimal functionality and comfort. This paper discusses the performance parameters, such as comfortability, safety, adaptability, and energy consumption, which are required for the development of an intelligent AGWR for outdoor environments. The challenges to measuring the parameters using current systems for data collection and analysis using vision capture and wearable sensors are presented and discussed