5,865 research outputs found
Enabling One-Phase Commit (1PC) Protocol for Web Service Atomic Transaction (WS-AT)
Business transactions (a.k.a., business conversations) are series of message exchanges that occur between software applications coordinating to achieve a business objective. Web service has been proven to be a promising technology in supporting business transactions. Business transaction can either be long-running or short-lived. A transaction whether in a database or web service paradigm consists of an “all-or-nothing” property. A transaction could either succeed or fail. Web Service Atomic Transactions (WS-AT) is a specification that currently supports Two-Phase Commit (2PC) protocol in a short-lived transaction. WS-AT is developed by OASIS–a standards development organization. However, not all business process scenarios require a 2PC, in that case, just a One-Phase Commit (1PC) would be sufficient. But unfortunately, WS-AT currently does not support 1PC optimization.
The ideal scenario where 1PC can be used instead of 2PC is when there is only a single participant. Short-lived transactions involving only one participant can commit without requiring initial “prepare” phase. Thus, there is no overhead to check whether the participant is prepared to either commit or rollback. This research focuses on designing a mechanism that can add 1PC support in WS-AT. The technical implementation of this mechanism is developed by using JBoss Transaction API. As a part of this thesis, 1PC mechanism for a single participant scenario was implemented. This mechanism optimizes the web service transaction process in terms of overhead and performance in terms of execution time. The technical implementation solution for 1PC mechanism was evaluated using three different business process scenarios in a controlled experiment as a presence or absence test. Evaluation results show that 1PC mechanism has a lower mean for execution time and performed significantly better than 2PC mechanism. Based on the contributions made by this thesis, we recommend OASIS to consider including 1PC mechanism as a part of the WS-AT specification
Visible Muslims in a non-Muslim World: Muslim Girls\u27 Experiences in Canadian Public High Schools
Through an analysis of the hijab as a marker, this study focuses on the constructions of Muslim girls\u27 identity. Ten Muslim girls who wear a hijab and attend public high schools in Windsor, Ontario were provided with a venue to express their perceptions of educational experiences in the Canadian education system. The results of this study challenge the literature that emphasizes the negative experiences and external obstacles that seemingly hinder Muslims from practicing and expressing their Muslim identity in a non-Muslim society. Although participants noted incidents of discrimination and negative stereotyping as problematic issues, they viewed their overall education as positive as a result of wearing the hijab; validating that their Muslim identity helped them perceive education as an overall pleasant experience. This study concludes by offering suggestions for policy reforms in education with regards to inclusive education and accommodation for Muslim students
Evaporation Channel as a Tool to Study Fission Dynamics
The dynamics of the fission process is expected to affect the evaporation
residue cross section because of the fission hindrance due to the nuclear
viscosity. Systems of intermediate fissility constitute a suitable environment
for testing such hypothesis, since they are characterized by evaporation
residue cross sections comparable or larger than the fission ones. Observables
related to emitted charged particle, due to their relatively high emission
probability, can be used to put stringent constraints on models describing the
excited nucleus decay and to recognize the effects of fission dynamics. In this
work model simulations are compared with the experimental data collected via
the ^{32}S + ^{100}Mo reaction at E_{lab}= 200 MeV. By comparing an extended
set of evaporation channel observables the limits of the statistical model and
the large improvement coming by using a dynamical model are evidenced. The
importance of using a large angular covering apparatus to extract the
observable is stressed. The opportunity to measure more sensitive observables
by a new detection device in operation at LNL are also discussed.Comment: v1: 7 pages, 6 figure
Entanglement and coherence in quantum state merging
Understanding the resource consumption in distributed scenarios is one of the
main goals of quantum information theory. A prominent example for such a
scenario is the task of quantum state merging where two parties aim to merge
their parts of a tripartite quantum state. In standard quantum state merging,
entanglement is considered as an expensive resource, while local quantum
operations can be performed at no additional cost. However, recent developments
show that some local operations could be more expensive than others: it is
reasonable to distinguish between local incoherent operations and local
operations which can create coherence. This idea leads us to the task of
incoherent quantum state merging, where one of the parties has free access to
local incoherent operations only. In this case the resources of the process are
quantified by pairs of entanglement and coherence. Here, we develop tools for
studying this process, and apply them to several relevant scenarios. While
quantum state merging can lead to a gain of entanglement, our results imply
that no merging procedure can gain entanglement and coherence at the same time.
We also provide a general lower bound on the entanglement-coherence sum, and
show that the bound is tight for all pure states. Our results also lead to an
incoherent version of Schumacher compression: in this case the compression rate
is equal to the von Neumann entropy of the diagonal elements of the
corresponding quantum state.Comment: 9 pages, 1 figure. Lemma 5 in Appendix D of the previous version was
not correct. This did not affect the results of the main tex
Relevance of the observation of UHE gammas to hard X-ray astronomy
A number of consequences of the presence of sources of ultra high energy (UHE) gamma rays, exemplified by Cygnus X-3, are examined. It is shown that there should be a flux of hard X-rays at all Galactic latitudes; a significant flux of extragalactic hard X-rays may also result. Relevance to theories of cosmic ray particle origin and propagation is discussed
Fluctuation relations for heat engines in time-periodic steady states
A fluctuation relation for heat engines (FRHE) has been derived recently. In
the beginning, the system is in contact with the cooler bath. The system is
then coupled to the hotter bath and external parameters are changed cyclically,
eventually bringing the system back to its initial state, once the coupling
with the hot bath is switched off. In this work, we lift the condition of
initial thermal equilibrium and derive a new fluctuation relation for the
central system (heat engine) being in a time-periodic steady state (TPSS).
Carnot's inequality for classical thermodynamics follows as a direct
consequence of this fluctuation theorem even in TPSS. For the special cases of
the absence of hot bath and no extraction of work, we obtain the integral
fluctuation theorem for total entropy and the generalized exchange fluctuation
theorem, respectively. Recently microsized heat engines have been realized
experimentally in the TPSS. We numerically simulate the same model and verify
our proposed theorems.Comment: 9 page
Research Notes: Potential of exotic soybeans in the sub-montane region of Himachal Pradesh (India)
Himachal Pradesh is a hilly state of Northern India , with its global location between 75°45\u27 - 79°04 \u27 E longitude and 30°22\u27 - 33°12\u27 N latitude. In this part of the country, soybean is indigenously grown as a rainy season crop up to an altitude of 1800 m above mean sea level . The indigenous soybean comprise small seeded, twining type low- yielding varieties
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