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1

Advanced cold molecule electron EDM  

Directory of Open Access Journals (Sweden)

Full Text Available Measurement of a non-zero electric dipole moment (EDM) of the electron within a few orders of magnitude of the current best limit of |de| < 1.05 × 10?27?e?cm [1] would be an indication of physics beyond the Standard Model. The ACME Collaboration is searching for an electron EDM by performing a precision measurement of electron spin precession in the metastable H3?1 state of thorium monoxide (ThO) using a slow, cryogenic beam. We discuss the current status of the experiment. Based on a data set acquired from 14 hours of running time over a period of 2 days, we have achieved a 1-sigma statistical uncertainty of ?de = 1 × 10?28?e?cm/?T, where T is the running time in days.

Campbell Wesley C.; Chan Cheong; DeMille David; Doyle John M.; Gabrielse Gerald; Gurevich Yulia V.; Hess Paul W.; Hutzler Nicholas R.; Kirilov Emil; O'Leary Brendon; Petrik Elizabeth S.; Spaun Ben; Vutha Amar C.

2013-01-01

2

EDM searches based on alkali or alkaline earth bearing molecules  

CERN Document Server

We introduce four new molecules -- YbRb, YbCs, YbSr$^+$, and YbBa$^+$ -- that may prove fruitful in experimental searches for the electric dipole moment (EDM) of the electron. These molecules can, in principle, be prepared at extremely low temperatures by photoassociating ultracold atoms, and therefore may present an advantage over molecular beam experiments. Here we discuss properties of these molecules and assess the effective electric fields they contribute to an electron EDM measurement.

Meyer, Edmund R

2009-01-01

3

Challenges and opportunities in the search for electric dipole moment (EDM) in ^225Ra atom  

Science.gov (United States)

The observation of a permanent electric dipole moment (EDM) in a non-degenerate system would indicate violation of time reversal symmetry. ^225Ra atom is a particularly attractive candidate for this search since it has a nuclear spin I=1/2 and has a significant nuclear octupole deformation. This property increases the Schiff moment of the nucleus and therefore enhances the atomic EDM. The half life (t1/2 =14.9 days) of ^225Ra is sufficiently long to perform EDM searches. Our group has already demonstrated the trapping of laser cooled Ra atoms in a magneto-optical trap (MOT) and transferring them to a far off resonant optical dipole trap (ODT). We will discuss our recent progress on manipulation of ultra cold Ra atoms in the ODT, efforts in improving our laser systems and generation of electric and magnetic fields required for the measurement.

Ranjan Kalita, Mukut; Bailey, Kevin; Dietrich, Matthew; Greene, John; Holt, Roy; Korsch, Wolfgang; Lu, Zheng-Tian; Mueller, Peter; O'Connor, Thomas; Parker, Richard; Sulai, Ibrahim; Singh, Jaideep

2011-10-01

4

Knowledge management and electronic publishing for the CNAO with EDMS  

International Nuclear Information System (INIS)

The Italian Government has recently approved the construction of a National Center for Oncological Hadrontherapy (CNAO). TERA (Foundation for Oncological Hadrontherapy) will lead the high technology projects of the CNAO, whose machine design is a spin-off to the medical world of the collaboration with CERN. The CERN EDMS (Engineering Data Management System) was initially launched at CERN to support the LHC project but has since become a general service available for all divisions and recognized experiments. As TERA is closely associated to CERN, TERA decided to profit from EDMS and to use it to support the ambitious Quality Assurance plan for the CNAO project. With this EDMS project TERA transfers know-how that has been developed in the HEP Community to a social sector of major importance that also has high-density information management needs. The features available in the CERN EDMS system provide the tools for managing the complete lifecycle of any technical document including a distributed approval process and a controlled distributed collaborative work environment using the World Wide Web. The system allows management of structures representing projects and relative documents including drawings within working contexts and with a customisable release procedure. TERA is customizing CERN EDMS to document the CNAO project activities, to ensure that the medical accelerator and its auxiliary installations can be properly managed throughout its lifecycle, from design to maintenance and possibly dismantling. The technical performance requirements of EDMS are identical to those for LHC and CERN in general. The authors will describe what they have learned about how to set-up an EDMS project, and how it benefits a challenging initiative like the CNAO Project of the TERA collaboration. The knowledge managed by the system will facilitate later installations of similar centers (planned for Lyon and Stockholm) and will allow the reuse of experience gained in Italy

2001-01-01

5

A search engine for the engineering and equipment data management system (EDMS) at CERN  

Energy Technology Data Exchange (ETDEWEB)

CERN, the European Laboratory for Particle Physics, located in Geneva -Switzerland, is currently building the LHC (Large Hadron Collider), a 27 km particle accelerator. The equipment life-cycle management of this project is provided by the Engineering and Equipment Data Management System (EDMS) Service. Using an Oracle database, it supports the management and follow-up of different kinds of documentation through the whole life cycle of the LHC project: design, manufacturing, installation, commissioning data etc... The equipment data collection phase is now slowing down and the project is getting closer to the 'As-Built' phase: the phase of the project consuming and exploring the large volumes of data stored since 1996. Searching through millions of items of information (documents, equipment parts, operations...) multiplied by dozens of points of view (operators, maintainers...) requires an efficient and flexible search engine. This paper describes the process followed by the team to implement the search engine for the LHC As-built project in the EDMS Service. The emphasis is put on the design decision to decouple the search engine from any user interface, potentially enabling other systems to also use it. Projections, algorithms, and the planned implementation are described in this paper. The implementation of the first version started in early 2007.

Tsyganov, A; Amerigo, S M; Petit, S; Pettersson, T; Suwalska, A [CERN, TS Department, CH-1211 Geneva 23 (Switzerland)], E-mail: Andrey.Tsyganov@cern.ch

2008-07-15

6

A search engine for the engineering and equipment data management system (EDMS) at CERN  

International Nuclear Information System (INIS)

CERN, the European Laboratory for Particle Physics, located in Geneva -Switzerland, is currently building the LHC (Large Hadron Collider), a 27 km particle accelerator. The equipment life-cycle management of this project is provided by the Engineering and Equipment Data Management System (EDMS) Service. Using an Oracle database, it supports the management and follow-up of different kinds of documentation through the whole life cycle of the LHC project: design, manufacturing, installation, commissioning data etc... The equipment data collection phase is now slowing down and the project is getting closer to the 'As-Built' phase: the phase of the project consuming and exploring the large volumes of data stored since 1996. Searching through millions of items of information (documents, equipment parts, operations...) multiplied by dozens of points of view (operators, maintainers...) requires an efficient and flexible search engine. This paper describes the process followed by the team to implement the search engine for the LHC As-built project in the EDMS Service. The emphasis is put on the design decision to decouple the search engine from any user interface, potentially enabling other systems to also use it. Projections, algorithms, and the planned implementation are described in this paper. The implementation of the first version started in early 2007

2008-01-01

7

A search engine for the engineering and equipment data management system (EDMS) at CERN  

Science.gov (United States)

CERN, the European Laboratory for Particle Physics, located in Geneva -Switzerland, is currently building the LHC (Large Hadron Collider), a 27 km particle accelerator. The equipment life-cycle management of this project is provided by the Engineering and Equipment Data Management System (EDMS [1] [2]) Service. Using an Oracle database, it supports the management and follow-up of different kinds of documentation through the whole life cycle of the LHC project: design, manufacturing, installation, commissioning data etc... The equipment data collection phase is now slowing down and the project is getting closer to the 'As-Built' phase: the phase of the project consuming and exploring the large volumes of data stored since 1996. Searching through millions of items of information (documents, equipment parts, operations...) multiplied by dozens of points of view (operators, maintainers...) requires an efficient and flexible search engine. This paper describes the process followed by the team to implement the search engine for the LHC As-built project in the EDMS Service. The emphasis is put on the design decision to decouple the search engine from any user interface, potentially enabling other systems to also use it. Projections, algorithms, and the planned implementation are described in this paper. The implementation of the first version started in early 2007.

Tsyganov, A.; Amérigo, S. M.; Petit, S.; Pettersson, T.; Suwalska, A.

2008-07-01

8

A search engine for the engineering and equipment data management system (EDMS) at CERN  

CERN Document Server

CERN, the European Laboratory for Particle Physics, located in Geneva -Switzerland, is currently building the LHC (Large Hadron Collider), a 27 km particle accelerator. The equipment life-cycle management of this project is provided by the Engineering and Equipment Data Management System (EDMS [1] [2]) Service. Using an Oracle database, it supports the management and follow-up of different kinds of documentation through the whole life cycle of the LHC project: design, manufacturing, installation, commissioning data etc... The equipment data collection phase is now slowing down and the project is getting closer to the 'As-Built' phase: the phase of the project consuming and exploring the large volumes of data stored since 1996. Searching through millions of items of information (documents, equipment parts, operations...) multiplied by dozens of points of view (operators, maintainers...) requires an efficient and flexible search engine. This paper describes the process followed by the team to implement the sear...

Tsyganov, A; Petit, S; Pettersson, Thomas Sven; Suwalska, A

2008-01-01

9

The Laue diffraction method to search for a neutron EDM. Experimental test of the sensitivity  

Energy Technology Data Exchange (ETDEWEB)

The feasibility of an experiment to search for the neutron electric dipole moment (EDM) by Laue diffraction in crystals without a center of symmetry was tested. At the PF1A beam of the ILL reactor a record time delay of {tau}{approx}2 ms for the passage of neutrons through a quartz crystal was reached for the (1 1 0) plane and diffraction angles equal to 88.5 degrees. That corresponds to an effective neutron velocity in the crystal of 20 m/s, while the velocity of the incident neutron was 800 m/s. It was shown experimentally that the value {tau}N{sup 1/2}, determining the method's sensitivity, has a maximum for the Bragg angle equal to 86 deg. The results allow us to estimate the statistical sensitivity of the method for the neutron EDM. For the PF1B beam of the ILL reactor the sensitivity can reach {approx}6x10{sup -25} e cm per day for the available quartz crystal.

Fedorov, V.V. E-mail: vfedorov@mail.pnpi.spb.ru; Lapin, E.G.; Lelievre-Berna, E.; Nesvizhevsky, V.V.; Petoukhov, A.K.; Semenikhin, S.Yu.; Soldner, T.; Tasset, F.; Voronin, V.V

2005-01-01

10

a New Search for a Permanent Dipole Moment of the Electron in a Solid State System  

Science.gov (United States)

Measurements of the electric dipole moment (EDM) of the neutron and the electron put the most stringent constraints on new sources of CP violation. CP violation is essential for generating the observed baryon asymmetry of the universe (BAU). Many models which propose large CP-odd mechanisms for BAU predict EDMs that exceed the limits of the most sensitive measurements. We are conducting a high sensitivity search for the electron EDM using a solid state system. It promises orders of magnitude improvement over atomic beam experiments solely from the available electron density. We present the experimental design and report on the current status.

Liu, C.-Y.; Lamoreaux, S. K.

11

On the search for neutron EDM using Laue diffraction by a crystal without a centre of symmetry  

Energy Technology Data Exchange (ETDEWEB)

A new method of neutron electric dipole moment (EDM) searching is proposed. It is based on the spin dependence of the Pendellosung phase of a neutron diffracted by a non-centrosymmetric crystal. A two-crystal set-up is proposed and analysed to get the most luminosity possible. A strong interplanar electric field of the crystal and a sufficiently long time for the neutron passage through the crystals for Bragg angles close to {pi}/2 makes it possible to exceed the sensitivity achieved with the ultra cold neutron (UCN) method. (author).

Fedorov, V.V.; Voronin, V.V.; Lapin, E.G. (Saint Petersburg Nuclear Physics Inst., Gatchina (Russian Federation))

1992-07-01

12

Test experiment to search for a neutron EDM by the Laue diffraction method  

CERN Document Server

A prototype experiment to measure the neutron electric dipole moment (nEDM) by spin-rotation in a non-centrosymmetric crystal in Laue geometry was carried out in order to investigate the statistical sensitivity and systematic effects of the method. The statistical sensitivity to the nEDM was about $6\\cdot 10^{-24}$ e$\\cdot $cm per day and can be improved by one order of magnitude for the full scale setup. Systematics was limited by the homogeneity of the magnetic field in the crystal region and by a new kind of spin rotation effect. We attribute this effect to a difference of the two Bloch waves amplitudes in the crystal, which is caused by the presence of a small crystal deformation due to a temperature gradient. In a revised scheme of the experiment, this effect could be exploited for a purposeful manipulation of the Bloch waves.

Fedorov, V V; Lelievre-Berna, E; Nesvizhevsky, V V; Petoukhov, A; Semenikhin, S Y; Soldner, T; Tasset, F; Voronin, V V

2005-01-01

13

EDM Constraints in Supersymmetric Theories  

CERN Multimedia

We systematically analyze constraints on supersymmetric theories imposed by the experimental bounds on the electron, neutron, and mercury electric dipole moments. We critically reappraise the known mechanisms to suppress the EDMs and conclude that only the scenarios with approximate CP-symmetry or flavour-off-diagonal CP violation remain attractive after the addition of the mercury EDM constraint.

Abel, S A; Lebedev, O

2001-01-01

14

A Healthy Electron/Neutron EDM in D3/D7 mu-Split SUSY  

CERN Document Server

Within the framework of N=1 gauged supergravity, using a phenomenological model which can be obtained locally as a Swiss-Cheese Calabi-Yau string-theoretic compactification with a mobile D3-brane localized on a nearly sLag three-cycle in the Calabi-Yau and fluxed stacks of wrapped D7-branes, and which provides a natural realization of mu-Split SUSY, we show that in addition to getting a significant value of electron/neutron EDM d_{e,n}/e at two-loop level, one can obtain a sizable contribution of d_{e,n}/e even at one-loop level. We obtain d_{e}/e ~ O(10^{-29}) cm from two-loop diagrams involving heavy sfermions and a light Higgs, and d_{e}/e ~ O(10^{-32}) cm from one-loop diagram involving heavy chargino and a light Higgs. Also, d_{n}/e ~ O(10^{-33}) cm from one-loop diagram involving SM-like quarks and Higgs. Next, by considering a Barr-Zee diagram involving W bosons and Higgs, and conjecturing that the CP-violating phase can appear from a linear combination of Higgs doublet obtained in the context of mu-sp...

Dhuria, Mansi

2013-01-01

15

Establishment of ''Internal Rules'' and EDMS - Electronic Document Management System at NPP NEK  

International Nuclear Information System (INIS)

[en] The main purpose of this paper is to present NPP's plans regarding the on-going project that started in November 2011, and that is related to the establishment of ''Internal Rules'' and EDMS - Electronic Document Management System.The term ''Internal Rules'' has been directly translated from Slovenian language (''Notranja pravila'') and adopted from the translated version of appropriate Slovenian national codes (ZVDAGA [1] in Slovenian language or PDAAIA [2] in English version). ''Internal Rules on capture and storage of materials in digital form'' refer to the rules adopted by a person as his/her internal act with reference to storage of his/her material. The main purpose for the establishment of the Internal Rules is to be able to justify that Krsko NPP is organized in compliance with the national codes covering that subject and strictly performing according to those Internal Rules. Once a Slovenian company achieves recognized and registered status in accordance with the Internal Rules document that has been certified and approved by the ARS (Archives of the Republic Slovenia), such company can utilize e-documents in the same way as they would utilize physical documents. Furthermore, a Slovenian company with approved Internal Rules can use e-documents in any legal aspect associated with the document's life cycle and the document's content as they would use the physical document or an authorized and approved copy of the physical document. Related to the nuclear regulatory background, NEK operates in compliance with the Slovenian legislation and also the US codes, regulations and guidelines; therefore, regarding the NPP specific documents, the Internal Rules and EDMS must also be in compliance with them. Since early 1990's, NEK has implemented document/records management system oriented towards supporting storage and management of physical documents/records and controlling distribution of active document copies. Document/records management system was supported by two applications (DCM-Document Control Module andQRM-Quality Records Management). Both computer applications were designed in order to fulfil requirements of the criteria VI (Document Control) and criteria XVII (Quality Assurance Records) of the US code [3]. In order to prevent confusion, clarifications regarding the terms ''documents'' and ''records'' are the following: Documents are an organized collection of information or objects that can be treated as a unit. A document may or may not meet the definition of a record. Records are sub-set of all information or all documents held by a person or organisation. Records present information, regardless of physical form or characteristics, appropriate for preservation as evidence of the organization, functions, policies, decisions, procedures, operations, or other activities of the organization. Examples of where this information may reside are books, papers, maps, photographs, machine-readable electronic files, or other documentary materials. Quality Assurance Records related to the NPPs are the records which furnish documentary evidence of the quality of items and activities affecting quality. For the purpose of the standards [4] and [5], a document is considered a quality assurance record when it has been completed.(author).

2012-01-01

16

Optical Spectroscopy of Tungsten Carbide for Uncertainty Analysis in Electron Electric Dipole Moment Search  

CERN Multimedia

We perform laser induced fluorescence(LIF) spectroscopy on a pulsed supersonic beam of tungsten carbide(WC) molecules, which has been proposed as a candidate molecular system for a permanent Electric Dipole Moment(EDM) search of the electron in its rovibrational ground state of the X3Delta1 state. In particular, [20.6]Omega=2, v'=4 <- X3Delta1,v"=0 transition at 485nm was used for the detection. The hyperfine structure and the Omega-doublet of the transition are measured, which are essential for estimating the size of the potential systematic uncertainties for electron EDM measurement. For further suppression of the systematic uncertainty, an alternative electron EDM measurement scheme utilizing the g factor crossing point of the Omega-doublet levels is discussed. On the other hand, flux and internal temperature of the molecular beam are characterized, which sets the limit on the statistical uncertainty of the electron EDM experiment. With the given results, the prospect of electron EDM experiment with the...

Lee, J; Skripnikov, L V; Petrov, A N; Titov, A V; Mosyagin, N S; Leanhardt, A E

2012-01-01

17

Perspectives for nEDM Search by Crystal Diffraction. Test Experiment and Results  

International Nuclear Information System (INIS)

An experiment searching for the neutron electric dipole moment by measuring spin-rotations in a non-centrosymmetric crystal was carried out to investigate the statistical sensitivity and systematic effects of the method. The preliminary result of this experiment is dn=(2.5±6.5).10-24 e.cm. The performance was essentially limited by the low luminosity of the prototype setup. With a dedicated setup and a large quartz crystal, the expected accuracy is ?2.10-26 e.cm for 100 days of data collection.

2009-08-15

18

Perspectives for nEDM Search by Crystal Diffraction. Test Experiment and Results  

Energy Technology Data Exchange (ETDEWEB)

An experiment searching for the neutron electric dipole moment by measuring spin-rotations in a non-centrosymmetric crystal was carried out to investigate the statistical sensitivity and systematic effects of the method. The preliminary result of this experiment is d{sub n}=(2.5{+-}6.5).10{sup -24} e.cm. The performance was essentially limited by the low luminosity of the prototype setup. With a dedicated setup and a large quartz crystal, the expected accuracy is {approx}2.10{sup -26} e.cm for 100 days of data collection.

Fedorov, V.V. [Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg (Russian Federation); Jentschel, M. [Institute Laue-Langevin, Grenoble (France); Kuznetsov, I.A.; Lapin, E.G. [Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg (Russian Federation); Lelievre-Berna, E.; Nesvizhevsky, V.; Petoukhov, A. [Institute Laue-Langevin, Grenoble (France); Semenikhin, S.Yu. [Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg (Russian Federation); Soldner, T. [Institute Laue-Langevin, Grenoble (France); Voronin, V.V. [Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg (Russian Federation)], E-mail: vvv@pnpi.spb.ru; Braginetz, Yu.P. [Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg (Russian Federation)

2009-08-15

19

Search for macroscopic CP violating forces using a neutron EDM spectrometer  

CERN Multimedia

The search for CP violating forces between nucleons in the so-called axion window of force ranges lam between 2x10^-5 m and 0.02 m is interesting because only little experimental information is available there. Axion-like particles would induce a pseudo-magnetic field for neutrons close to bulk matter. A laboratory search investigates neutron spin precession close to a heavy mirror using ultracold neutrons in a magnetic resonance spectrometer. From the absence of a shift of the magnetic resonance we established new constraints on the coupling strength of axion-like particles in terms of the product gs x gp of scalar and pseudo-scalar dimensionless constants, as a function of the force range lam, gs x gp x lam^2 <= 2x10-21 [cm^2] (C.L.95%) for 10^-4 cm < lam < 1 cm. For 0.1 cm < lam < 1 cm previous limits are improved by 4 to 5 orders of magnitude.

Serebrov, A P; Geltenbort, P; Fomin, A K; Ivanov, S N; Kolomensky, E A; Krasnoshekova, I A; Lasakov, M S; Lobashev, V M; Pirozhkov, A N; Varlamov, V E; Vasiliev, A V; Zherebtsov, O M; Aleksandrov, E B; Dmitriev, S P; Dovator, N A

2009-01-01

20

A search for the electric dipole of the electron  

International Nuclear Information System (INIS)

[en] We report a new upper limit on the electric dipole moment (EDM) of the electron of de = 0.1 ± 3.2 x 10-26 e-cm. This precision is one hundred times better than any previously published limit and a factor of two better than that of unofficial reports. Recently there has been a great deal of theoretical interest in the possibility of a non-zero electron EDM. Models such as the left-right-symmetric Standard Model and an ''off-standard'' model with new heavy neutrinos are constrained by the new limit on de. A non-zero electron EDM would violate the time reversal and parity space-time symmetries. T-violation was observed in neutral kaon decay and is still not fully explained by the Standard Model. Our experimental technique involves searching for an energy shift, linear in applied electric field, between the mF = 1 and mF = -1 magnetic sublevels of the F=1 hyperfine level of the 62P1/2 ground state of atomic thallium. If the electron has a non-zero EDM, this thallium state will exhibit an atomic electric dipole moment that is roughly 600 times larger. The energy shift is detected with the technique of magnetic resonance spectroscopy, employing separated oscillating fields, applied to an atomic beam of thallium. In the approach, any relative phase-shift between the mF = ±1 components of the F=1 wavefunction acquired by the atom as it travels through an electric field is detected through interference with two separate oscillating magnetic fields located on either side of the electric field. The new level of precision is achieved through several improvements on previous experiments including employment of a vertical apparatus, two opposing atomic beams, and optical pumping for atomic state selection and analysis

1989-01-01

 
 
 
 
21

A search for the electric dipole of the electron  

Energy Technology Data Exchange (ETDEWEB)

We report a new upper limit on the electric dipole moment (EDM) of the electron of d{sub e} = 0.1 {plus minus} 3.2 {times} 10{sup {minus}26} e-cm. This precision is one hundred times better than any previously published limit and a factor of two better than that of unofficial reports. Recently there has been a great deal of theoretical interest in the possibility of a non-zero electron EDM. Models such as the left-right-symmetric Standard Model and an off-standard'' model with new heavy neutrinos are constrained by the new limit on d{sub e}. A non-zero electron EDM would violate the time reversal and parity space-time symmetries. T-violation was observed in neutral kaon decay and is still not fully explained by the Standard Model. Our experimental technique involves searching for an energy shift, linear in applied electric field, between the m{sub F} = 1 and m{sub F} = {minus}1 magnetic sublevels of the F=1 hyperfine level of the 6{sup 2}P{sub 1/2} ground state of atomic thallium. If the electron has a non-zero EDM, this thallium state will exhibit an atomic electric dipole moment that is roughly 600 times larger. The energy shift is detected with the technique of magnetic resonance spectroscopy, employing separated oscillating fields, applied to an atomic beam of thallium. In the approach, any relative phase-shift between the m{sub F} = {plus minus}1 components of the F=1 wavefunction acquired by the atom as it travels through an electric field is detected through interference with two separate oscillating magnetic fields located on either side of the electric field. The new level of precision is achieved through several improvements on previous experiments including employment of a vertical apparatus, two opposing atomic beams, and optical pumping for atomic state selection and analysis.

Abdullah, K.F.

1989-08-01

22

Laue diffraction method of a neutron EDM search. Project of the experiment  

Energy Technology Data Exchange (ETDEWEB)

Experiment for the search for the neutron electric dipole moment using Laue diffraction in a noncentrosymmetric crystal is proposed. The method is based on the effect of depolarization of the diffracted neutron beam due to interaction with an interplanar electric field of a noncentrosymmetric crystal. The value of this field can exceed {approx}10{sup 8} V/cm. An essential feature of the proposed Laue diffraction method is the possibility to increase more than by the order of value the time {tau} of neutron passage through the crystal and, accordingly, the time of interaction with the electric field using the Bragg angles close to {pi}/2. The sensitivity of the method can be {approx}10{sup -25} e cm /day for a really existing quartz crystal.

Voronin, V.V.; Fedorov, V.V.; Lapin, E.G.; Semenikhin, S.Yu

2003-07-01

23

Search for the electron electric dipole moment using $\\Omega$-doublet levels in PbO$^*$  

CERN Document Server

We present results of the first experiment to probe for the electric dipole moment (EDM) of the electron using an $\\Omega$-doublet state in a polar molecule. If the molecule is both massive and has a large molecular-fixed frame dipole moment, then the $\\Omega$-doublet states have the potential to greatly increase the sensitivity of experiments searching for the EDM while also allowing for new methods of systematic error rejection. Here, we use the metastable $a(1)^3\\Sigma^+$ state of lead monoxide (PbO) to probe for the electron EDM. Our best fit for the electron EDM of $d_e = (-4.4\\pm9.5_\\text{stat}\\pm1.8_\\text{syst})\\times10^{-27}\\ecm$ allows us to place an upper limit on the magnitude of the EDM of $|d_e|<1.7\\times10^{-26}\\ecm$ (90% confidence). While this is less stringent than limits from other, previous experiments, our work emphasizes the systematic error rejection properties associated with the $\\Omega$-doublet level structure. The results should inform the work of other, ongoing experiments that u...

Eckel, S; Kirilov, E; Smith, H W; DeMille, D

2013-01-01

24

Proof of principle for a high sensitivity search for the electric dipole moment of the electron using the metastable a(1)[^3\\Sigma^+] state of PbO  

CERN Document Server

The metastable a(1)[^3\\Sigma^+] state of PbO has been suggested as a suitable system in which to search for the electric dipole moment (EDM) of the electron. We report here the development of experimental techniques allowing high-sensitivity measurements of Zeeman and Stark effects in this system, similar to those required for an EDM search. We observe Zeeman quantum beats in fluorescence from a vapor cell, with shot-noise limited extraction of the quantum beat frequencies, high counting rates, and long coherence times. We argue that improvement in sensitvity to the electron EDM by at least two orders of magnitude appears possible using these techniques.

Kawall, D; Bickman, S R; Jiang, Y; De Mille, D P

2003-01-01

25

EDMS: what it was, is, and could be.  

Science.gov (United States)

The decision to implement an Electronic Document Management System (EDMS) should not be made lightly. Such is the advice of a health are provider organization that pioneered the technology a decade ago. University Health Systems of Eastern Carolina's largest facility, Pitt County Memorial Hospital (PCMH), implemented an EDMS in February 1992 and converted to its current EDMS in December 1999. This article describes PCMH's transition from paper to automation, the many trials along the way, and the advantages an EDMS offers. PMID:12402635

Foster, Jean T

2002-08-01

26

EDMS: what it was, is, and could be.  

UK PubMed Central (United Kingdom)

The decision to implement an Electronic Document Management System (EDMS) should not be made lightly. Such is the advice of a health are provider organization that pioneered the technology a decade ago. University Health Systems of Eastern Carolina's largest facility, Pitt County Memorial Hospital (PCMH), implemented an EDMS in February 1992 and converted to its current EDMS in December 1999. This article describes PCMH's transition from paper to automation, the many trials along the way, and the advantages an EDMS offers.

Foster JT

2002-08-01

27

Simple Proof that the Usual Transformations of the Electric and Magnetic Fields are not the Lorentz Transformations and EDM Searches  

CERN Multimedia

The usual transformations of the three-dimensional (3D) fields E and B that are found in [1] ([1] A. Einstein, Ann. Physik \\17, 891 (1905)) are always considered to be the relativistically correct Lorentz transformations (LT) of E and B. However, as proved in, e.g., [2] ([2] T. Ivezi\\'c, Found. Phys. Lett. 18, 301 (2005)), these transformations drastically differ from the LT of the relativistically correct 4D electric and magnetic fields. In this paper a simple proof of that difference will be presented and the consequences for EDM experiments and for some quantum phase shifts experiments are briefly examined. In all such experiments the usual 3D quantities, e.g., E, B, ... are measured and their relativistically incorrect transformations are used, but not the relativistically correct 4D geometric quantities, e.g., E^a, B^a, ... and their LT.

IveziÄ?, Tomislav

2008-01-01

28

Neutron spin optics in a noncentrosymmetric crystals as a way for nEDM search. New experimental results  

Energy Technology Data Exchange (ETDEWEB)

An optical effect of a neutron spin rotation in the noncentrosymmetric quartz crystal was investigated. The effect was caused by the Schwinger interaction of the moving neutron with the strong electric field affects the neutron in noncentrosymmetric crystal. Value and sign of the effect depend on a deviation of the neutron energy from the Bragg one. We proposed to use the second crystal placed in parallel position to the main one to select the neutron with the given deviation parameter. It was shown that we could control and tune the value and sign of the electric field acting on the registered neutron by heating (or cooling) of the second crystal. The value of this field can reach {approx}1x10{sup 8}V/cm that gives us the real perspectives to improve essentially the present sensitivity to measure the neutron electric dipole moment (EDM) by the crystal diffraction technique.

Fedorov, V.V. [Petersburg Nuclear Physics Institute, 188300, Gatchina, St. Petersburg (Russian Federation) ]. E-mail: vfedorov@pnpi.spb.ru; Kuznetsov, I.A. [Petersburg Nuclear Physics Institute, 188300, Gatchina, St. Petersburg (Russian Federation) ; Lapin, E.G. [Petersburg Nuclear Physics Institute, 188300, Gatchina, St. Petersburg (Russian Federation) ; Semenikhin, S.Yu. [Petersburg Nuclear Physics Institute, 188300, Gatchina, St. Petersburg (Russian Federation) ; Voronin, V.V. [Petersburg Nuclear Physics Institute, 188300, Gatchina, St. Petersburg (Russian Federation)

2006-11-15

29

Neutron spin optics in a noncentrosymmetric crystals as a way for nEDM search. New experimental results  

International Nuclear Information System (INIS)

[en] An optical effect of a neutron spin rotation in the noncentrosymmetric quartz crystal was investigated. The effect was caused by the Schwinger interaction of the moving neutron with the strong electric field affects the neutron in noncentrosymmetric crystal. Value and sign of the effect depend on a deviation of the neutron energy from the Bragg one. We proposed to use the second crystal placed in parallel position to the main one to select the neutron with the given deviation parameter. It was shown that we could control and tune the value and sign of the electric field acting on the registered neutron by heating (or cooling) of the second crystal. The value of this field can reach ?1x108V/cm that gives us the real perspectives to improve essentially the present sensitivity to measure the neutron electric dipole moment (EDM) by the crystal diffraction technique

2006-11-15

30

How to produce EDMS requirements and cost-benefit data.  

Science.gov (United States)

Electronic document management systems (EDMS) have a profound impact on administrative operations of health care provider organizations. Thorough yet conservative system requirements and cost-benefit data can prove the necessity and priority of the EDMS. This case study-based article provides a methodology for all EDMS implementations, including the preparation of the vision and scope, business analysis, cost-benefit analysis, and system specification and project plan. These are illustrated with EDMS examples. To successfully minimize project risk, the article reviews the importance of phasing, standards, and integration, and it provides six detailed examples of this methodology. PMID:12402631

Kerkoulas, Patrice Schwegman

2002-08-01

31

How to produce EDMS requirements and cost-benefit data.  

UK PubMed Central (United Kingdom)

Electronic document management systems (EDMS) have a profound impact on administrative operations of health care provider organizations. Thorough yet conservative system requirements and cost-benefit data can prove the necessity and priority of the EDMS. This case study-based article provides a methodology for all EDMS implementations, including the preparation of the vision and scope, business analysis, cost-benefit analysis, and system specification and project plan. These are illustrated with EDMS examples. To successfully minimize project risk, the article reviews the importance of phasing, standards, and integration, and it provides six detailed examples of this methodology.

Kerkoulas PS

2002-08-01

32

EDMS based workflow for Printing Industry  

Directory of Open Access Journals (Sweden)

Full Text Available Information is indispensable factor of any enterprise. It can be a record or a document generated for every transaction that is made, which is either a paper based or in electronic format for future reference. A Printing Industry is one such industry in which managing information of various formats, with latest workflows and technologies, could be a nightmare and a challenge for any operator or an user when each process from the least bit of information to a printed product are always dependendent on each other. Hence the information has to be harmonized artistically in order to avoid production downtime or employees pointing fingers at each other. This paper analyses how the implementation of Electronic Document Management System (EDMS) could contribute to the Printing Industry for immediate access to stored documents within and across departments irrespective of geographical boundaries. The paper outlines initially with a brief history, contemporary EDMS system and some illustrated examples with a study done by choosing Library as a pilot area for evaluating EDMS. The paper ends with an imitative proposal that maps several document management based activities for implementation of EDMS for a Printing Industry.

Prathap Nayak; Anuradha Rao; Ramakrishna Nayak

2012-01-01

33

Hadronic EDM Constraints on Orbifold GUTs  

CERN Document Server

We point out that the null results of the hadronic electric dipole moment (EDM) searches constrain orbifold grand unified theories (GUTs), where the GUT symmetry and supersymmetry (SUSY) are both broken by boundary conditions in extra dimensions and it leads to rich fermion and sfermion flavor structures. A marginal chromoelectric dipole moment (CEDM) of the up quark is induced by the misalignment between the CP violating left- and right-handed up-type squark mixings, in contrast to the conventional four-dimensional SUSY GUTs. The up quark CEDM constraint is found to be as strong as those from charged lepton flavor violation (LFV) searches. The interplay between future EDM and LFV experiments will probe the structures of the GUTs and the SUSY breaking mediation mechanism.

Hisano, J; Nagai, M; Hisano, Junji; Kakizaki, Mitsuru; Nagai, Minoru

2005-01-01

34

Understanding Educational Data Mining (EDM)  

Directory of Open Access Journals (Sweden)

Full Text Available Recently Educational Data Mining (EDM) is successful in attracting a great deal of attention of researchers. It is an emerging multidisciplinary research area. Educational Data Mining (EDM) is the process of discovering useful information from raw data generated and collected from educational systems which can be used by the different stakeholders. In EDM different techniques and methods for exploring data originating from various educational information systems can be developed. It is rich application area for data mining as well as a learning science, also due to the growing availability of educational data. EDM contributes towards the study of how students can learn and the settings in which they learn. It enables data-driven decision making for improving the current educational practice and learning material. The objective of this paper is to present a brief overview of EDM and to observe the development in the field of EDM.

Mr.Suhas G. Kulkarni; Mr.Ganesh C. Rampure; Mr.Bhagwat Yadav

2013-01-01

35

EMERSE: The Electronic Medical Record Search Engine  

Digital Repository Infrastructure Vision for European Research (DRIVER)

EMERSE (The Electronic Medical Record Search Engine) is an intuitive, powerful search engine for free-text documents in the electronic medical record. It offers multiple options for creating complex search queries yet has an interface that is easy enough to be used by those with minimal computer exp...

Hanauer, David A.

36

EMERSE: The Electronic Medical Record Search Engine.  

UK PubMed Central (United Kingdom)

EMERSE (The Electronic Medical Record Search Engine) is an intuitive, powerful search engine for free-text documents in the electronic medical record. It offers multiple options for creating complex search queries yet has an interface that is easy enough to be used by those with minimal computer experience. EMERSE is ideal for retrospective chart reviews and data abstraction and may have potential for clinical care as well.

Hanauer DA

2006-01-01

37

EMERSE: The Electronic Medical Record Search Engine  

Science.gov (United States)

EMERSE (The Electronic Medical Record Search Engine) is an intuitive, powerful search engine for free-text documents in the electronic medical record. It offers multiple options for creating complex search queries yet has an interface that is easy enough to be used by those with minimal computer experience. EMERSE is ideal for retrospective chart reviews and data abstraction and may have potential for clinical care as well.

Hanauer, David A.

2006-01-01

38

Search for supersymmetric partners of electrons  

International Nuclear Information System (INIS)

A search for the supersymmetric partners of the electron was made assuming different photino masses. If both types of scalar electrons have an equal mass and the photino is massless, then the lower limit of the scalar electron mass was found to be 25.2 GeV/c2, whereas, if the scalar electrons have different masses, the lower limits is 21.8 GeV/c2. (orig.)

1984-01-01

39

Search for supersymmetric partners of electrons  

International Nuclear Information System (INIS)

A search for the supersymmetric partners of the electron was made assuming different photino masses. If both types of scalar electrons have an equal mass and the photino is massless, then the lower limit of the scalar electron mass was found to be 25.2 GeV/c2, whereas, if the scalar electrons have different masses, the lower limit is 21.8 GeV/c2. (orig.)

1985-03-14

40

Bacillus subtilis EdmS (formerly PgsE) participates in the maintenance of episomes.  

Science.gov (United States)

Extrachromosomal DNA maintenance (EDM) is an important process in molecular breeding and for various applications in the construction of genetically engineered microbes. Here we describe a novel Bacillus subtilis gene involved in EDM function called edmS (formerly pgsE). Functional gene regions were identified using molecular genetics techniques. We found that EdmS is a membrane-associated protein that is crucial for EDM. We also determined that EdmS can change a plasmid vector with an unstable replicon and worse-than-random segregation into one with better-than-random segregation, suggesting that the protein functions in the declustering and/or partitioning of episomes. EdmS has two distinct domains: an N-terminal membrane-anchoring domain and a C-terminal assembly accelerator-like structure, and mutational analysis of edmS revealed that both domains are essential for EDM. Further studies using cells of Bacillus megaterium and itsedmS (formerly capE) gene implied that EdmS has potential as a molecular probe for exploring novel EDM systems. PMID:23583563

Ashiuchi, Makoto; Yamashiro, Daisuke; Yamamoto, Kento

2013-04-10

 
 
 
 
41

Optimizing the Machining Parameters of Micro-EDM for Inconel 718  

Directory of Open Access Journals (Sweden)

Full Text Available This paper aims to study on the feasibility of micron size hole manufacturing using micro Electric Discharge Machining (Micro-EDM). Main and auxiliary unit of the micro-EDM machine tool and their functions are described in some detail. The technological and electrical parameters that are effective in Micro-EDM are stated explicitly. Geometry of the machined micro-holes and resolidified material around the hole entrance are observed. Several descriptive pictures, obtained by Scanning Electron Microscope (SEM) are included to understand the phenomena. EDM is an important process in the field of micro machining. However, a number of issues remain to be solved in order to successfully implement it an industrial environment. This study investigates the optimization of machining parameters for machining in micro EDM. Here, the overcut and the Metal Removal Rate (MRR) and Tool wear ratio are targeted. The study focuses on a specific combination of electrode and work piece material and proposes a typical method for micro EDM process optimization. The cutting of the Inconel 718 using Micro EDM with a brass electrode by using Taguchi methodology has been reported. The Taguchi method is used to formulate the experiment layout, to analyze the effect of each parameter on the machining characteristics and to predict the optimal choice for each EDM parameters like Discharge current, Pulse on time, Pulse off time. It found that these parameters have a significant influence on the machining characteristics such as Metal Removal Rate (MRR), Overcut and Tool wear ratio.

R. Manikandan; R. Venkatesan

2012-01-01

42

Search for the electron electric dipole moment  

International Nuclear Information System (INIS)

Extensions to the Standard Model (SM) typically include new heavy particles and new mechanisms for CP violation. These underlying phenomena can give rise to electric dipole moments of the electron and other particles. Tabletop-scale experiments used to search for these effects are described. Present experiments are already sensitive to new physics at the TeV scale, and new methods could extend this range dramatically. Such experiments could be among the first to show evidence for physics beyond the SM

2006-07-11

43

One-loop analysis of the four-Fermi contribution to the atomic EDM within RPVMSSM  

CERN Multimedia

The contribution in the R-parity violating (RPV) Minimal Supersymmetric Standard Model (MSSM) to the electric dipole moment (EDM) of $^{199}$Hg at the one-loop level is evaluated. At the one-loop level, the $^{199}$Hg EDM receives RPV contribution whose couplings are of a different type from the tree level analysis. This contribution is shown to be constrained by using the limit to the CP-odd electron-nucleon (e-N) interaction given by the recent result of $^{199}$Hg EDM experiment.

Yamanaka, Nodoka; Kubota, Takahiro

2010-01-01

44

Search for the electric dipole moment of the electron with thorium monoxide  

International Nuclear Information System (INIS)

The electric dipole moment of the electron (eEDM) is a signature of CP-violating physics beyond the standard model. We describe an ongoing experiment to measure or set improved limits to the eEDM, using a cold beam of thorium monoxide (ThO) molecules. The metastable H 3?1 state in ThO has important advantages for such an experiment. We argue that the statistical uncertainty of an eEDM measurement could be improved by as much as three orders of magnitude compared to the current experimental limit, in a first-generation apparatus using a cold ThO beam. We describe our measurements of the H state lifetime and the production of ThO molecules in a beam, which provide crucial data for the eEDM sensitivity estimate. ThO also has ideal properties for the rejection of a number of known systematic errors; these properties and their implications are described.

2010-04-14

45

Search for the electric dipole moment of the electron with thorium monoxide  

CERN Document Server

The electric dipole moment of the electron (eEDM) is a signature of CP-violating physics beyond the Standard Model. We describe an ongoing experiment to measure or set improved limits to the eEDM, using a cold beam of thorium monoxide (ThO) molecules. The metastable $H {}^3\\Delta_1$ state in ThO has important advantages for such an experiment. We argue that the statistical uncertainty of an eEDM measurement could be improved by as much as 3 orders of magnitude compared to the current experimental limit, in a first-generation apparatus using a cold ThO beam. We describe our measurements of the $H$ state lifetime and the production of ThO molecules in a beam, which provide crucial data for the eEDM sensitivity estimate. ThO also has ideal properties for the rejection of a number of known systematic errors; these properties and their implications are described.

Vutha, Amar C; Gurevich, Yulia V; Hutzler, Nicholas R; Parsons, Maxwell; Patterson, David; Petrik, Elizabeth; Spaun, Benjamin; Doyle, John M; Gabrielse, Gerald; DeMille, David

2009-01-01

46

Econometric estimates of the EDM model. Energy  

Energy Technology Data Exchange (ETDEWEB)

This report concerns the work that has been done by ARS of Milan, in strict cooperation with EEC, D.XII and ENEA, to update and improve the existing version of EDM/Italy. This last is fully documented in the ARS previous report of 1980, which still remains the basic reference for EDM/Italy. EDM/Italy data base was updated to 1979 and many data were corrected after a careful checking, particularly for 1976-78. Following some ENEA requirements, gas series were splitted in natural and other gases and all non private land transportation consumptions were concentrated in LT sector. Single price indexes for energy products were substituted by a matrix of different prices for different sector uses of fuels. Also the remaking of estimations has been extensive, due both to changes in data base and to EEC requirement to have a system as much price-responsive as it was possible. Finally a test was performed of the so called ''Cambridge'' system specification of EDM, against the ''Frankfurt'' single equation version, which is used at present for Italy.

1983-01-01

47

Search for scalar electrons at PEP  

International Nuclear Information System (INIS)

Experimental results from e+e- reactions at the Positron Electron Project (PEP) using the High Resolution Spectrometer (HRS) are presented. Events with two electrons, and no other charged particles, in the final state are studied. Limits are given for the production of scalar-electrons predicted by models based on supersymmetry. In particular the pair production of such particles through s-channel single photon annihilation and t-channel inelastic scattering is considered. The data are well described by quantum electrodynamics (QED) but we observe one event which is also consistent with a supersymmetric model. Using this single event we find that the mass, M/sub se/, of these scalar-electrons es excluded, to 95% CL, in the range 1.8 less than or equal to M/sub se/ less than or equal to 14.2 GeV/c2. A description of the HRS detector is given with particular emphasis on the electronic trigger system

1983-01-01

48

Nuclear Structure and the Search for Collective Enhancement of P,T-Violation  

CERN Multimedia

The discovery of the atomic electric dipole moment (EDM) would reveal the simultaneous violation of parity (P) and time-reversal (T) invariance. The EDM can be induced by T-odd forces between the nucleus and atomic electrons. As the nuclear dipole moment is screened according to the Schiff theorem, the appropriate nuclear operator is the Schiff moment that may exist in nuclei under PT-violation. We briefly review the current experimental situation and discuss more in detail the ideas concerning possible collective mechanisms for the enhancement of the nuclear Schiff moment. The most promising directions are related to the coexistence of octupole and quadrupole collective modes, either in the form of static deformation or as soft vibrational excitations. The search for enhancement is important for widening the pool of nuclei as candidates for the atomic EDM as well as for development of nuclear many-body theory beyond standard mean-field and random phase approximations.

Auerbach, Naftali

2008-01-01

49

Search for excited electrons using the ZEUS detector  

International Nuclear Information System (INIS)

This paper reports a search for excited electrons at the HERA electron-proton collider. In a sample corresponding to an integrated luminosity of 26 nb-1, no evidence was found for any resonant state decaying into e-?, ?W- or e-Z0. Limits on the coupling strength of an excited electron have been determined for masses between 45 and 225 GeV. This study also reports the observation of the wide-angle e? Compton scattering process. (orig.)

1993-01-01

50

Can electronic search engines optimize screening of search results in systematic reviews: an empirical study  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background Most electronic search efforts directed at identifying primary studies for inclusion in systematic reviews rely on the optimal Boolean search features of search interfaces such as DIALOG® and Ovid™. Our objective is to test the ability of an Ultraseek® search engine to rank MEDLINE® records of the included studies of Cochrane reviews within the top half of all the records retrieved by the Boolean MEDLINE search used by the reviewers. Methods Collections were created using the MEDLINE bibliographic records of included and excluded studies listed in the review and all records retrieved by the MEDLINE search. Records were converted to individual HTML files. Collections of records were indexed and searched through a statistical search engine, Ultraseek, using review-specific search terms. Our data sources, systematic reviews published in the Cochrane library, were included if they reported using at least one phase of the Cochrane Highly Sensitive Search Strategy (HSSS), provided citations for both included and excluded studies and conducted a meta-analysis using a binary outcome measure. Reviews were selected if they yielded between 1000–6000 records when the MEDLINE search strategy was replicated. Results Nine Cochrane reviews were included. Included studies within the Cochrane reviews were found within the first 500 retrieved studies more often than would be expected by chance. Across all reviews, recall of included studies into the top 500 was 0.70. There was no statistically significant difference in ranking when comparing included studies with just the subset of excluded studies listed as excluded in the published review. Conclusion The relevance ranking provided by the search engine was better than expected by chance and shows promise for the preliminary evaluation of large results from Boolean searches. A statistical search engine does not appear to be able to make fine discriminations concerning the relevance of bibliographic records that have been pre-screened by systematic reviewers.

Sampson Margaret; Barrowman Nicholas J; Moher David; Clifford Tammy J; Platt Robert W; Morrison Andra; Klassen Terry P; Zhang Li

2006-01-01

51

The neutron EDM experiment at the ILL  

CERN Document Server

The latest-generation neutron electric dipole moment (EDM) experiment has been collecting data at the ILL since 1996. It uses a 'cohabiting' atomic-mercury magnetometer to measure and compensate for the magnetic field fluctuations that were the principal source of systematic errors in previous experiments. The first results, which are soon to be published, essentially verify the existing limit on the dipole moment d sub n; however, this new measurement is clearly limited by statistical rather than systematic uncertainties.

Harris, P G; Pendlebury, J M; Shiers, D; Smith, K F; Grinten, M G D; Baker, C A; Green, K; Iaydjiev, P; Ivanov, S; Geltenbort, P

2000-01-01

52

Search for excited electrons in ep collisions at HERA  

Energy Technology Data Exchange (ETDEWEB)

A search for excited electrons is performed using the full e{sup {+-}}p data sample collected by the H1 experiment at HERA, corresponding to a total luminosity of 475 pb{sup -1}. The electroweak decays of excited electrons e{sup *} {yields}e{gamma}, e{sup *} {yields}eZ and e{sup *} {yields}{nu}W with subsequent hadronic or leptonic decays of the W and Z bosons are considered. No evidence for excited electron production is found. Mass dependent exclusion limits on e{sup *} production cross sections and on the ratio f/{lambda} of the coupling to the compositeness scale are derived within gauge mediated models. These limits extend the excluded region compared to previous excited electron searches. The e{sup *} production via contact interactions is also addressed for the first time in ep collisions. (orig.)

Aaron, F.D. [National Inst. for Physics and Nuclear Engineering (NIPNE), Bucharest (Romania)]|[Bucharest Univ. (Romania). Faculty of Physics; Alexa, C. [National Inst. for Physics and Nuclear Engineering (NIPNE), Bucharest (Romania); Andreev, V. [Lebedev Physical Inst., Moscow (RU)] (and others)

2008-05-15

53

Search for excited electrons in ep collisions at HERA  

International Nuclear Information System (INIS)

A search for excited electrons is performed using the full e±p data sample collected by the H1 experiment at HERA, corresponding to a total luminosity of 475 pb-1. The electroweak decays of excited electrons e* ?e?, e* ?eZ and e* ??W with subsequent hadronic or leptonic decays of the W and Z bosons are considered. No evidence for excited electron production is found. Mass dependent exclusion limits on e* production cross sections and on the ratio f/? of the coupling to the compositeness scale are derived within gauge mediated models. These limits extend the excluded region compared to previous excited electron searches. The e* production via contact interactions is also addressed for the first time in ep collisions. (orig.)

2008-05-29

54

CryoEDM: A cryogenic experiment to measure the neutron electric dipole moment  

International Nuclear Information System (INIS)

CryoEDM is an experiment that aims to measure the electric dipole moment (EDM) of the neutron to a precision of 10-28 e cm. A description of CryoEDM, the apparatus, technologies and commissioning is presented.

2009-01-01

55

Towards Semantic Search and Inference in Electronic Medical Records  

Directory of Open Access Journals (Sweden)

Full Text Available Background This paper presents a novel approach to searching electronic medical records that is based on concept matching rather than keyword matching. Aims The concept-based approach is intended to overcome specific challenges we identified in searching medical records. Method Queries and documents were transformed from their term-based originals into medical concepts as defined by the SNOMED-CT ontology. Results Evaluation on a real-world collection of medical records showed our concept-based approach outperformed a keyword baseline by 25% in Mean Average Precision. Conclusion The concept-based approach provides a framework for further development of inference based search systems for dealing with medical data.

Bevan Koopman; Peter Bruza; Laurianne Sitbon; Michael Lawley

2012-01-01

56

Searching of Double Electron Capture in the TGV Experiment  

CERN Document Server

The first investigations of the rare nuclear process - double electron capture of $^{106}$Cd have been performed using the low-background multi-detector spectrometer TGV-2 (Telescope Germanium Vertical). The preliminary results of calculations of experimental data obtained using 11.3 and 10 g of enriched $^{106}$Cd, and 14.5 g of natural Cd were presented. The sensitivity of T$_{1/2}^{EC/EC}>2.6\\cdot10^{19}$y (90\\% CL) was obtained for the searching of double electron capture of $^{106}$Cd ($0^{+} - 0^{+}$) in the investigation of natural Cd.

Brudanin, V B; Briançon, C; Benes, P; Vylov, T D; Gusev, K N; Egorov, V G; Klimenko, A A; Kovalenko, V E; Korolev, N A; Salamatin, A V; Timkov, V V; Cermák, P; Shirchenko, M V; Shitov, Yu A; Stekl, I

2004-01-01

57

Searching of double electron capture in the TGV experiment  

International Nuclear Information System (INIS)

The first investigations of the rare nuclear process - double electron capture of 106Cd have been performed using the low-background multi-detector spectrometer TGV-2 (Telescope Germanium Vertical). The preliminary results of calculations of experimental data obtained using 11.3 and 10 g of enriched 106Cd, and 14.5 g of natural Cd were presented. The sensitivity of T1/2EC/EC > 2.6 ? 1019 y (90% CL) was obtained for the searching of double electron capture of 106Cd (0+ - 0+) in the investigation of natural Cd

2004-01-01

58

Search for excited electrons through $\\gamma\\gamma$ scattering  

CERN Multimedia

We study the potential of $\\gamma \\gamma$ option of future high energy linear $e^{+}e^{-}$ colliders to search for excited electrons with spin-1/2. We calculate single production cross sections, give the angular distributions and $f-m^*$ contour plots for $\\sqrt{s}=0.5$ TeV and $\\sqrt{s}=3$ TeV both using the standard (tree level) couplings and anomal couplings.

Ozansoy, A

2012-01-01

59

Electron electric dipole moment experiment using electric-field quantized slow cesium atoms  

CERN Multimedia

A proof-of-principle electron electric dipole moment (e-EDM) experiment using slow cesium atoms, nulled magnetic fields, and electric field quantization has been performed. With the ambient magnetic fields seen by the atoms reduced to less than 200 pT, an electric field of 6 MV/m lifts the degeneracy between states of unequal mF and, along with the low (approximately 3 m/s) velocity, suppresses the systematic effect from the motional magnetic field. The low velocity and small residual magnetic field have made it possible to induce transitions between states and to perform state preparation, analysis, and detection in regions free of applied static magnetic and electric fields. This experiment demonstrates techniques that may be used to improve the e-EDM limit by two orders of magnitude, but it is not in itself a sensitive e-EDM search, mostly due to limitations of the laser system.

Amini, Jason M; Gould, Harvey

2007-01-01

60

Query log analysis of an electronic health record search engine.  

UK PubMed Central (United Kingdom)

We analyzed a longitudinal collection of query logs of a full-text search engine designed to facilitate information retrieval in electronic health records (EHR). The collection, 202,905 queries and 35,928 user sessions recorded over a course of 4 years, represents the information-seeking behavior of 533 medical professionals, including frontline practitioners, coding personnel, patient safety officers, and biomedical researchers for patient data stored in EHR systems. In this paper, we present descriptive statistics of the queries, a categorization of information needs manifested through the queries, as well as temporal patterns of the users' information-seeking behavior. The results suggest that information needs in medical domain are substantially more sophisticated than those that general-purpose web search engines need to accommodate. Therefore, we envision there exists a significant challenge, along with significant opportunities, to provide intelligent query recommendations to facilitate information retrieval in EHR.

Yang L; Mei Q; Zheng K; Hanauer DA

2011-01-01

 
 
 
 
61

Query log analysis of an electronic health record search engine.  

Science.gov (United States)

We analyzed a longitudinal collection of query logs of a full-text search engine designed to facilitate information retrieval in electronic health records (EHR). The collection, 202,905 queries and 35,928 user sessions recorded over a course of 4 years, represents the information-seeking behavior of 533 medical professionals, including frontline practitioners, coding personnel, patient safety officers, and biomedical researchers for patient data stored in EHR systems. In this paper, we present descriptive statistics of the queries, a categorization of information needs manifested through the queries, as well as temporal patterns of the users' information-seeking behavior. The results suggest that information needs in medical domain are substantially more sophisticated than those that general-purpose web search engines need to accommodate. Therefore, we envision there exists a significant challenge, along with significant opportunities, to provide intelligent query recommendations to facilitate information retrieval in EHR. PMID:22195150

Yang, Lei; Mei, Qiaozhu; Zheng, Kai; Hanauer, David A

2011-10-22

62

The neutron EDM in the SM: a review  

International Nuclear Information System (INIS)

We review the status of the electric dipole moment (EDM) of neutron in the Standard Model (SM). The contributions of the strong and electroweak interactions are discussed separately. In each case the structure of Lagrangian and the sources of CP violation are specified, and subsequently calculational details are given. These two contributions to the neutron EDM exist in any extension of the SM including supersymmetry, two-doublet models as well as models with more than three generations of fermions. We briefly discuss the status of the neutron EDM in such extensions and give the relevant literature. (author)

2000-01-01

63

Search for double electron capture of 106Cd  

Science.gov (United States)

A search for double electron capture of 106Cd was performed at the Modane Underground Laboratory (4800 m w.e.) using a low-background and high-sensitivity multidetector spectrometer TGV-2 (Telescope Germanium Vertical). New limits on ? +/EC, EC/EC decays of 106Cd were obtained from preliminary calculations of experimental data accumulated for 4800 h of measurement of 10 g of 106Cd with enrichment of 75%. They are > 6.2 × 1019 yr for transitions to the ground 0+ state of 106Pd. All limits are given at 90% C.L.

Rukhadze, N. I.; Beneš, P.; Briançon, Ch.; Brudanin, V. B.; ?ermák, P.; Danevich, F. A.; Egorov, V. G.; Gusev, K. N.; Klimenko, A. A.; Kovalenko, V. E.; Kovalik, A.; Salamatin, A. V.; Štekl, I.; Timkin, V. V.; Tretyak, V. I.; Vylov, Ts.

2006-12-01

64

A search for supersymmetric electrons with the Mark II detector at PEP [Positron Electron Project  

International Nuclear Information System (INIS)

An experimental search for selectrons, the supersymmetric partner of the electron, has been performed at the PEP storage ring at SLAC using the Mark II detector. The experimental search done was based upon hypothetical reaction in e+e- interactions at PEP center of mass energies of 29 GeV. In this reaction the selectrons, e, are assumed produced by the interaction of one of initial state electrons with a photon radiated from the other initial state electron. This latter electron is assumed to continue down the beam pipe undetected. The photon and electron then produce a selectron and a photino, ?, in the supersymmetric analog of Compton scattering. The photino is assumed to be the lightest supersymmetric particle, and as such, does not interact in the detector, thereby escaping detection very much like a neutrino. The selectron is assumed to immediately decay into an electron and photino. This electron is produced with large p perpendicular with respect to the beam pipe, since it must balance the transverse momentum carried off by the photinos. Thus, the experimental signature of the process is a single electron in the detector with a large unbalanced tranverse momentum. No events of this type were observed in the original search of 123 pb-1 of data, resulting in a cross section limit of less than 2.4 x 10-2 pb (at the 95% CL) within the detector acceptance. This cross section ulimit applies to any process which produces anomalous single electron events with missing transverse momentum. When interpreted as a supersymmetry search it results in a lower selectron mass limit of 22.2 GeV/c2 for the case of massless photinos. Limits for non-zero mass photinos have been calculated. 87 refs., 67 figs., 17 tabs.

1987-01-01

65

A search for supersymmetric electrons with the Mark II detector at PEP (Positron Electron Project)  

Energy Technology Data Exchange (ETDEWEB)

An experimental search for selectrons, the supersymmetric partner of the electron, has been performed at the PEP storage ring at SLAC using the Mark II detector. The experimental search done was based upon hypothetical reaction in e/sup +/e/sup -/ interactions at PEP center of mass energies of 29 GeV. In this reaction the selectrons, e-tilde, are assumed produced by the interaction of one of initial state electrons with a photon radiated from the other initial state electron. This latter electron is assumed to continue down the beam pipe undetected. The photon and electron then produce a selectron and a photino, ..gamma..-tilde, in the supersymmetric analog of Compton scattering. The photino is assumed to be the lightest supersymmetric particle, and as such, does not interact in the detector, thereby escaping detection very much like a neutrino. The selectron is assumed to immediately decay into an electron and photino. This electron is produced with large p perpendicular with respect to the beam pipe, since it must balance the transverse momentum carried off by the photinos. Thus, the experimental signature of the process is a single electron in the detector with a large unbalanced tranverse momentum. No events of this type were observed in the original search of 123 pb/sup -1/ of data, resulting in a cross section limit of less than 2.4 x 10/sup -2/ pb (at the 95% CL) within the detector acceptance. This cross section upper limit applies to any process which produces anomalous single electron events with missing transverse momentum. When interpreted as a supersymmetry search it results in a lower selectron mass limit of 22.2 GeV/c/sup 2/ for the case of massless photinos. Limits for non-zero mass photinos have been calculated. 87 refs., 67 figs., 17 tabs.

LeClaire, B.W.

1987-10-01

66

Search for nuclear excitation by electronic transition in 235U  

International Nuclear Information System (INIS)

We have searched for the nuclear excitation by electronic transition (NEET) of the isomeric level at 76 eV in 235U in a plasma induced by a YAG laser with an energy of 1 Joule and a full width at half maximum time distribution of 5 ns, operating at an intensity of 1013 W cm-2. We present a thorough description of the experimental conditions and analysis of our data. In this experimental situation we do not detect any excitation of the isomeric level, a result that is at variance with a previously reported one. An upper limit of 6x10-6 per atom and per second averaged over the laser-pulse width has been set on the nuclear excitation rate. This value is compared with results obtained in previous experimental and theoretical works

2004-01-01

67

Search for double electron capture of 106Cd  

International Nuclear Information System (INIS)

A search for double electron capture of 106Cd was performed at the Modane Underground Laboratory (4800 m w.e.) using a low-background and high-sensitivity multidetector spectrometer TGV-2 (Telescope Germanium Vertical). New limits on ?+/EC, EC/EC decays of 106Cd were obtained from preliminary calculations of experimental data accumulated for 4800 h of measurement of 10 g of 106Cd with enrichment of 75%. They are T1/22??+EC > 9.1 x 1018 yr, T1/22?EC/EC > 1.9 x 1019 yr for transitions to the first 2+, 511.9 keV excited state of 106Pd, and T1/22??+EC > 1.3 x 1019 yr, T1/22?EC/EC > 6.2 x 1019 yr for transitions to the ground 0+ state of 106Pd. All limits are given at 90% C.L

2006-01-01

68

Neutrino-electron scattering and the search for new physics  

International Nuclear Information System (INIS)

I want to discuss the role of neutrino-electron scattering in the search for physics beyond the standard model. The standard model makes specific predictions about the nature of the neutrinos which participate in such processes and about the interactions responsible for them. The process upon which I shall concentrate is elastic scattering, but I shall pay some attention to inelastic processes in which the target electron is itself transformed into a heavier charged lepton, in other words the inverse of the decay of the heavier lepton. In the case of elastic scattering we are mainly looking at neutral-currents and we can ask a series of simple questions: Does the interaction conserve lepton flavor? Does it fit the prescriptions of the standard model? Are the neutrinos Majorana or Dirac particles? In the case of inverse muon and tau decays we are looking at charge-currents, and we want to pin down the identity of the neutrinos emitted in the decay of these charged leptons as well as to set bounds on non-(V-A) components of the interaction. In order to discuss these topics, it is useful to review the general properties of the scattering process, especially the kinematics and the general form of the differential cross-section. Kinematics are important because they prevent us from searching for some processes and effects which we would like to detect. The differential cross-section, if measured with sufficient care, may tell us something about the presence of non-standard terms in the interaction and even about the nature of the neutrino. The detailed outline of the talk is: identity of the final state neutrino; kinematics; differential cross-sections; oscillations and universality; a test for Dirac neutrinos; inverse muon decay; and the standard model and radiative corrections. 22 ref., 2 tabs

1988-01-01

69

Multitechnique characterization of CPTi surfaces after electro discharge machining (EDM).  

Science.gov (United States)

OBJECTIVES: The aim of this study was to comparatively assess the surface roughness parameters, the hardness, and the elemental and molecular alterations induced on CPTi surfaces after conventional finishing and finishing with electro discharge machining (EDM). MATERIALS AND METHODS: A completed cast model of an arch that received four implants was used for the preparation of two grade II CPTi castings. One framework was conventionally finished (CF), whereas the other was subjected to EDM finishing. The surface morphology was imaged employing SEM. 3D surface parameters (S a, S q, S z, S ds, S dr, and S ci) were calculated by optical profilometry. The elemental composition of the treated surfaces was determined by energy dispersive X-ray analysis, whereas the elemental and chemical states of the outmost layer were investigated by X-ray photoelectron spectrometry. Surface hardness was also tested with a Knoop indenter. The results of surface roughness parameters, elemental analysis, and hardness were compared using unpaired t test (a?=?0.05). RESULTS: The EDM group demonstrated a rougher surface, with a significant uptake of C and Cu. The CF surface mainly consisted of TiO2. On EDM surface though, Ti was probed in different chemicals states (TiO2, Ti2O3, TiC and metallic Ti) and Cu was traced as Cu2O and CuO. Hardness after EDM was almost ten times higher than CF. CONCLUSIONS: EDM significantly affected surface roughness, chemical state, and hardness properties of grade II CPTi castings in comparison with CF. CLINICAL RELEVANCE: The morphological and elemental alterations of EDM-treated CPTi surfaces may strongly contribute to the reduced corrosion resistance documented for this procedure. The degradation of electrochemical properties may have further biological implications through ionic release in the oral environment. PMID:23504225

Zinelis, Spiros; Al Jabbari, Youssef S; Thomas, Andrew; Silikas, Nick; Eliades, George

2013-03-17

70

Search Hanford accessible reports electronically system design description. Revision 1  

Energy Technology Data Exchange (ETDEWEB)

The Search Hanford Accessible Records Electronically (SHARE) system was produced by a combined team of personnel from Westinghouse Hanford Company (WHC) Corrective Action Data Systems (CADS) and Information Resource Management (IRM) Information and Scientific Systems (ISS) organizations. The ESQD Text Evaluation and exchange Tool (ETEXT) prototype was used as a basis for the requirements used to support this design/build effort. TOPIC was used to build the SHARE application. TOPIC is a text search and retrieval software product produced by the Verity Corporation. The TOPIC source code is not provided with the product, and the programs cannot be changed. TOPIC can be customized for special requirements. The software is fully documented. Help messages, menu and screen layouts, command edits and options, and internal system design are all described in the TOPIC documentation. This System Design Description (SDD) will not reiterate the TOPIC documentation and design. Instead, it will focus on the SHARE installation of TOPIC. This SDD is designed to assist the SHARE database/infobase administrator (DBA) in maintaining and supporting the application. It assumes that the assigned DBA is knowledgeable in using the TOPIC product, and is also knowledgeable in using a personal computer (PC), Disk Operating System (DOS) commands, and the document WHC-CM-3-10. SHARE is an Impact Level 4 system, and all activities related to SHARE must conform with the WHC-CM-3-10 procedures for an Impact Level 4 system. The Alternatives Analysis will be treated as a level 3-Q document, to allow for reference by potential future projects.

Gilomen, T.L.

1995-12-31

71

AN IMPROVED TOPOLOGICAL DESCRIPTOR EDm AND ITS APPLICATION  

Directory of Open Access Journals (Sweden)

Full Text Available In this paper, on the basis of the topological index EDm derived from ionicity index matrix, improved distance matrix and branching degree matrix, we proposed the new topological descriptor EDm' by introducing the bond angle into hidden hydrogen graph of molecules and using the geometric distance instead of the sum of bond length between two vertexes. The EDm describes the molecular structure more accurately, and realizes unique characterization to cis-trans isomers. The quantitative structure-property relationship (QSPR) models, with correlation coefficients (R) in the range of 0.984-1.000 for the boiling point (b.p.), the standard enthalpy of formation ( DfHm?), the molar refraction (Rm) and the molar volume (Vm) of some cis-trans isomers for alkenes, are subsequently developed by index EDm'. Moreover, the good stability and predictive ability of the models were demonstrated by LOO (leave-one-out) method and RSP (random sampling prediction) method, which further manifests the index EDm has high potential of wide applications in QSPR study.

CHANGMING NIE; YAXIN WU; RONGYAN WU; SONGNIAN WEN

2012-01-01

72

A search for electron cyclotron maser emission from compact binaries  

CERN Multimedia

Unipolar induction (UI) is a fundamental physical process, which occurs when a conducting body transverses a magnetic field. It has been suggested that UI is operating in RX J0806+15 and RX J1914+24, which are believed to be ultra-compact binaries with orbital periods of 5.4 min and 9.6 min respectively. The UI model predicts that those two sources may be electron cyclotron maser sources at radio wavelengths. Other systems in which UI has been predicted to occur are short period extra-solar terrestrial planets with conducting cores. If UI is present, circularly polarised radio emission is predicted to be emitted. We have searched for this predicted radio emission from short period binaries using the VLA and ATCA. In one epoch we find evidence for a radio source, coincident in position with the optical position of RX J0806+15. Although we cannot completely exclude that this is a chance alignment between the position of RX J0806+15 and an artifact in the data reduction process, the fact that it was detected at ...

Ramsay, Gavin; Wu, Kinwah; Slee, Bruce; Saxton, Curtis

2007-01-01

73

ThF^{+} as a Candidate for eEDM Measurements  

Science.gov (United States)

The low-lying ^{3}?_{1} state of ThF^{+} has advantageous properties for studies of the electron electric dipole moment. Calculations indicate that internal fields as high as 90 GV/cm can be generated, and there is just one isotope of ThF with significant natural abundance. Previous experiments show two low-lying electronic states of ThF^{+} spaced by 315 cm^{-1} (JCP 136, 104305 (2012)). These are ^{1}? and ^{3}?_{1}, but the ordering is still in question. Experiments are in progress to determine the electronic angular momentum of the ground state. Laser excitation spectra for ThF^{+} have been recorded for transitions in the 19300-21100 cm^{-1} range. For eEDM studies it is technically more convenient to work with lower energy transitions. Survey spectra covering the range 15000-19000 cm^{-1} are currently being recorded. Results from these measurements will be presented and their relevance to possible eEDM studies will be discussed.

Heaven, Michael C.; Bartlett, Joshua H.

2013-06-01

74

Fine tuning your search output: Word processors, desktop publishing, electronic mail, databases and beyond  

Energy Technology Data Exchange (ETDEWEB)

This paper presents an overview of possibilities and procedures for the delivery of the results of an online search. Word processors can add headers and footers which explain the topic of the search, even highlight search terms. Desktop publishing programs can produce typeset-like output. Electronic mail permits almost immediate delivery of search results. Local databases can give your patron results that can be searched time and again (provided you have taken care of copyright restrictions), give you a means for producing printed indexes of searches. Beyond lie personal information managers, hard disk organizers, and other new products.

Ellingen, D.C.

1989-11-01

75

A search for single electron production in electron positron annihilation at E = 29 GeV  

Energy Technology Data Exchange (ETDEWEB)

This thesis presents experimental results from the ASP detector which took data on e{sup +}e{sup -} interactions in the PEP storage ring at SLAC. Its design was particularly suitable for searching for production of supersymmetric particles. The motivations for and phenomenology of Supersymmetry are discussed. In particular, the production of a single supersymmetric electron ( selectron'', {tilde e}) in combination with a supersymmetric photon ( photino'', {tilde {gamma}}) would result in events in which a single electron and no other particles are observed in the detector at an e{sup +}e{sup -} collider such as PEP, provided the masses of these particles are not too large. Such events would also result from the production of a single supersymmetric W-boson ( wino'', {tilde W}) in combination with a supersymmetric neutrino ( sneutrino'', {tilde {nu}}). These processes make it possible to search for electrons and winos with masses greater than the beam energy. Observation of these unusual events would distinctly indicate the production of new particles. The ASP detector was designed to be hermetic and to provide efficient event reconstruction for low multiplicity events. The detector is described and its performance is evaluated; it is found to be well-suited to this study. The data sample collected with the detector was thoroughly analyzed for evidence of single-electron events. The various possible background processes are considered and Monte Carlo calculations of the distributions from single selectron and single wino production are presented. Using this information an efficient off-line event selection process was developed, and it is described in detail. 82 refs., 41 figs., 4 tabs.

Steele, T.R.

1989-09-01

76

Empirical Modeling of EDM Parameters Using Grey Relational Analysis  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Optimization of multi criteria problems is a great need of producers to product precision parts with low costs. Many methods such as Taguchi and Response Surface Methodology have been employed for optimization of EDM process. However there are few researches involve the optimization of multi-res...

A. Doniavi; M. Eskandarzade; A. Abdi; A. Totonchi

77

A New Method For A Sensitive Deuteron EDM Experiment  

CERN Multimedia

In this paper a new method is presented for particles in storage rings which could reach a statistical sensitivity of 10**(-27) e cm for the deuteron EDM. This implies an improvement of two orders of magnitude over the present best limits on the T-odd nuclear forces ksi parameter.

Semertzidis, Y K; Auzinsh, M; Balakin, V; Bazhan, A; Bennett, G W; Carey, R M; Cushman, P B; Debevec, P T; Dudnikov, A; Farley, F J M; Hertzog, D W; Iwasaki, M; Jungmann, Klaus; Kawall, D; Khazin, B I; Khriplovich, I B; Kirk, B; Kuno, Y; Lazarus, D M; Leipuner, L B; Logashenko, V; Lynch, K R; Marciano, W J; McNabb, R; Meng, W; Miller, J P; Morse, W M; Onderwater, Gerco; Orlov, Yu F; Ozben, C S; Prig, R; Rescia, S; Roberts, B L; Shafer-Ray, N; Silenko, A; Stephenson, E J; Yoshimura, K

2003-01-01

78

EDM process optimisation via predicting a controller model  

Directory of Open Access Journals (Sweden)

Full Text Available Purpose: Electro-discharge machining is an important manufacture technology in machining difficult-to-cut materials and to shape complicated contours and profiles with high material removal rate, low tool wear and good tolerances.Design/methodology/approach: In machining of carbon-based materials such as WC-Co and non-oxide ceramics which are growingly used, the complexity and non-linear nature of EDM is a serious problem. EDM is the best and nearly the only non-conventional method for machining of these kind of materials, but it shows high instability and tendency to arcing, compared with machining of steel. Occurrence of instability phenomenon due to the different input setting up parameters make the modeling of EDM process impossible with conventional methods. To achieve instantaneous data from machining condition, the new method of fuzzy analysis of single machining pulses and computing the magnitude of system condition in the form of a real number between 0 and 1, has been used.Findings: Some tests with WC-Co material are carried out and finally, the results of implementation of control system on a sinking ED machine and an EDM system that has been set with an expert user, has been compared.Practical implications: The optimization and control of EDM process using the neural model predictive control method. A genetic algorithm has also been employed to optimize the input parameters and to create the optimized setting collection of process.Originality/value: The testing results from ED machining of WC-Co confirms the capability of the system of predictive controller model based on neural network with 32.8% efficiency increasing in stock removal rate.

R.A. Mahdavinejad

2009-01-01

79

Search For A Permanent Electric Dipole Moment Using Atomic Indium  

CERN Document Server

We propose indium (In) as a possible candidate for observing the permanent electric dipole moment (EDM) arising from the violations of parity (P) and time-reversal (T) symmetries. This atom has been laser cooled and therefore the measurement of its EDM has the potential of improving on the current best EDM limit for a paramagnetic atom which comes from thallium. We report the results of our calculations of the EDM enhancement factor due to the electron EDM and the ratio of the atomic EDM to the electron-nucleus scalar-pseudoscalar (S-PS) interaction coupling constant in In in the framework of the relativistic coupled cluster theory. It might be possible to get new limits for the electron EDM and the S-PS CP violating coupling constant by combining the results of our calculations with the measured value of the EDM of In when it is available. These limits could have important implications for the standard model (SM) of particle physics.

Sahoo, B K; Das, B P; 10.1103/PhysRevA.84.030502

2011-01-01

80

Search Hanford accessible reports electronically system requirements specification  

Energy Technology Data Exchange (ETDEWEB)

The Emergency, Safety, & Quality (ESQ) Services organization of Westinghouse Hanford Company (WHC) is experiencing changes related to new programs. The programs include Corrective Actions Management Systems, Self-Assessment, Trend Analysis, and Lessons Learned analysis. The programs are pushing up organizational costs while funding and manpower levels are projected to be dropping. A large cost involved in implementing the new programs is the cost for people to locate unstructured information required to make decisions or write documentation. But, most resources for retrieving information are found in structured database systems. This means that unstructured information that must be located has to be found by one of these methods: (1) searching manually through documents, (2) searching individual documents one at a time with word processing programs, (3) searching through text fields with query systems primarily designed for structured database information, or (4) develop a text search and retrieval system designed for unstructured information. One example of this is using Occurrence Reporting Processing System (ORPS) and Quality, Environmental, and Safety Tracking (QUEST) documents. An explanation of this is in the following textual box.

Willers, K.J.

1994-02-28

 
 
 
 
81

Integration of the electronics and batteries inside the hollow core of a search coil  

Science.gov (United States)

A novel design of a miniature search coil magnetometer is proposed based on the integration of the electronics and batteries within the hollow core of the search coil. In contrast with conventional designs, where the search coil and its electronics have individual housings and electrostatic shields, this paper presents a design in which the core of the search coil serves both as the housing and the magnetic shield for the electronics and batteries. Moreover, the electrostatic shield of the search coil also shields the electronics and batteries. We found that a thin-wall tube core with sufficient permeability is able to replace a solid rod core without decreasing the average flux sensed by the coil winding. In addition, the outer diameter of the tube core can be increased beyond its optimum size to provide more space for the electronics and batteries without considerably affecting the search coil resolution. To validate the effectiveness of this new design, a miniature search coil magnetometer was built and tested for very low frequencies and ultra-low power consumption.

Grosz, Asaf; Paperno, Eugene; Amrusi, Shai; Liverts, Edward

2010-05-01

82

Combined electronic structure and evolutionary search approach to materials design  

DEFF Research Database (Denmark)

We show that density functional theory calculations have reached an accuracy and speed making it possible to use them in conjunction with an evolutionary algorithm to search for materials with specific properties. The approach is illustrated by finding the most stable four component alloys out of the 192 016 possible fcc and bcc alloys that can be constructed out of 32 different metals. A number of well known and new "super alloys" are identified in this way.

Johannesson, Gisli Holmar; Bligaard, Thomas

2002-01-01

83

“Mathematical modeling of EDM hole drilling using response surface methodology”  

Directory of Open Access Journals (Sweden)

Full Text Available This paper reports an experimental investigation of EDM drilling of Ø2 mm holes on Inconel 718using brass electrode. The effect of process parameters (discharge current, pulse on and off times, andcapacitance) on process outputs (material removal rate and electrode wear rate) was determined based onminimum number of experiments. The mathematical modeling of process has been done using response surfacemethodology. The results show that the developed model can achieve reliable prediction of experimentalresults within acceptable accuracy

N. G. Alvi; S. V. Deshmukh; Ram.R.Wayzode

2012-01-01

84

Use and Search Pattern of Electronic Resources in Five Autonomous Engineering Colleges (Bengaluru)  

Directory of Open Access Journals (Sweden)

Full Text Available Purpose: This study evaluates the use of electronic resources among the faculty in five autonomous Engineering Colleges in Bengaluru. It evaluates the purpose,benefits, preference of web browsers, search engines, file formats, problem faced,and search patterns as the key parameters. It highlights some problems,constraints and forward suggestions for better use of electronic resources.Methodology/Approach: The structured questionnaire is used for data collection besides personal interview and observation to add clarity.Findings: The study assesses the faculty awareness and use of electronic resources in their academic and research needs. Besides, familiarity about search patterns for effective retrieval.Research Limitations: The study is limited to the faculty of the Autonomous Engineering Colleges affiliated to Visvesvaraya Technological University (VTU) in Bengaluru Region of Karnataka State, India.Keywords: e-resources; search pattern; e-resource use; Autonomous Engineering Colleges.Paper Type: Survey cum Research

G. Kiran Kumar; Mallinath Kumbar

2012-01-01

85

Electronic Commerce, Consumer Search and Retailing Cost Reduction  

CERN Multimedia

This paper explains four things in a unified way. First, how e-commerce can generate price equilibria where physical shops either compete with virtual shops for consumers with Internet access, or alternatively, sell only to consumers with no Internet access. Second, how these price equilibria might involve price dispersion on-line. Third, why prices may be higher on-line. Fourth, why established firms can, but need not, be more reluctant than newly created firm to adopt e-commerce. For this purpose we develop a model where e-commerce reduces consumers' search costs, involves trade-offs for consumers, and reduces retailing costs.

Pereira, P; Pereira, Pedro; Maz\\'on, Cristina

2001-01-01

86

The Cold Dark Matter Search test stand warm electronics card  

Energy Technology Data Exchange (ETDEWEB)

A card which does the signal processing for four SQUID amplifiers and two charge sensitive channels is described. The card performs the same functions as is presently done with two custom 9U x 280mm Eurocard modules, a commercial multi-channel VME digitizer, a PCI to GPIB interface, a PCI to VME interface and a custom built linear power supply. By integrating these functions onto a single card and using the power over Ethernet standard, the infrastructure requirements for instrumenting a Cold Dark Matter Search (CDMS) detector test stand are significantly reduced.

Hines, Bruce; /Colorado U., Denver; Hansen, Sten; /Fermilab; Huber, Martin; /Colorado U., Denver; Kiper, Terry; /Fermilab; Rau, Wolfgang; /Queen' s U., Kingston; Saab, Tarek; /Florida U.; Seitz, Dennis; Sundqvist, Kyle; /UC, Berkeley; Mandic, Vuk; /Minnesota U.

2010-11-01

87

Pohled student? gymnázií na p?edm?t Základy spole?enských v?d  

Directory of Open Access Journals (Sweden)

Full Text Available P?ísp?vek seznamuje s pohledem student? gymnázií (ISCED 3A) na p?edm?t Základy spole?enských v?d a porovnává n?která zjišt?ní s pohledy student? lyceí ve Francii na jim odpovídající p?edm?ty. V úvodní ?ásti charakterizuje pojetí výuky t?chto p?edm?t? a vý?et po?tu hodin, který je jim v?novaný, zmi?uje samotnou aktuálnost p?edm?tu Základy spole?enských v?d a poté uvádí díl?í výsledky dotazníkového šet?ení provedeného u student? gymnázií a lycea.

Alice Ba?íková

2012-01-01

88

Enhanced identification of eligibility for depression research using an electronic medical record search engine.  

UK PubMed Central (United Kingdom)

PURPOSE: Electronic medical records (EMRs) have become part of daily practice for many physicians. Attempts have been made to apply electronic search engine technology to speed EMR review. This was a prospective, observational study to compare the speed and clinical accuracy of a medical record search engine vs. manual review of the EMR. METHODS: Three raters reviewed 49 cases in the EMR to screen for eligibility in a depression study using the electronic medical record search engine (EMERSE). One week later raters received a scrambled set of the same patients including 9 distractor cases, and used manual EMR review to determine eligibility. For both methods, accuracy was assessed for the original 49 cases by comparison with a gold standard rater. RESULTS: Use of EMERSE resulted in considerable time savings; chart reviews using EMERSE were significantly faster than traditional manual review (p=0.03). The percent agreement of raters with the gold standard (e.g. concurrent validity) using either EMERSE or manual review was not significantly different. CONCLUSIONS: Using a search engine optimized for finding clinical information in the free-text sections of the EMR can provide significant time savings while preserving clinical accuracy. The major power of this search engine is not from a more advanced and sophisticated search algorithm, but rather from a user interface designed explicitly to help users search the entire medical record in a way that protects health information.

Seyfried L; Hanauer DA; Nease D; Albeiruti R; Kavanagh J; Kales HC

2009-12-01

89

Search for electric dipole moments at storage rings  

CERN Multimedia

Permanent electric dipole moments (EDMs) violate parity and time reversal symmetry. Within the Standard Model (SM) they are many orders of magnitude below present experimental sensitivity. Many extensions of the SM predict much larger EDMs, which are therefore an excellent probe for the existence of "new physics". Until recently it was believed that only electrically neutral systems could be used for sensitive searches of EDMs. With the introduction of a novel experimental method, high precision for charged systems will be within reach as well. The features of this method and its possibilities are discussed.

Onderwater, Gerco

2012-01-01

90

Search for hadron jets and large transverse momentum electrons at the SPS anti p p collider  

International Nuclear Information System (INIS)

The search of high transverse momentum electrons needs the use of all the different elements of the UA2 detector; therefore the description of this search is a good way to understand the features of the apparatus, and its performance in a collider environment. We present a preliminary analysis of the UA2 data collected during the last Collider run (20 nb-1 integrated luminosity) with particular emphasis on large transverse momentum hadron jets and on electrons having the configuration expected from the decay of electroweak bosons

1983-03-04

91

A search for muon neutrino to electron neutrino oscillations in the MINOS experiment  

CERN Document Server

The centerpiece of the thesis is the search for muon neutrino to electron neutrino oscillations which would indicate a non-zero mixing angle between the first and third neutrino generations (I 13), currently the ""holy grail"" of neutrino physics. The optimal extraction of the electron neutrino oscillation signal is based on the novel ""library event matching"" (LEM) method which Ochoa developed and implemented together with colleagues at Caltech and at Cambridge, which improves MINOS' (Main Injector Neutrino Oscillator Search) reach for establishing an oscillation signal over any other method

Ricoux, Juan Pedro Ochoa

2011-01-01

92

Vertical EDM (electric discharge machining) using modular programming  

Energy Technology Data Exchange (ETDEWEB)

The usual function of computer numerically controlled (CNC) machining programs is to specify a sequence of machining operations. When CNC is applied to electric discharge machining (EDM), the possibilities and needs are much greater. This paper describes a modular system of programming in which various functions are carried out by subroutines contained in the controller memory. The subroutines are made more versatile by using variables. Such functions as orbiting, cavity inspection, electrode wear measurement and compensation, and multiple cavities are possible. 3 refs., 9 figs.

Fuller, J.E.

1989-01-01

93

{sup 3}He MAGNETOMETRY FOR A NEUTRON EDM MEASUREMENT  

Energy Technology Data Exchange (ETDEWEB)

The behavior of small amounts of polarized {sup 3}He in a bath of superfluid {sup 4}He at temperatures below 1 K is critical to a new technique for measuring the EDM of the neutron. We report on studies to enhance the number of ultracold neutrons produced in such a bath, on the development of neutron tomography in gaseous mixtures, on magnet properties associated with the precession of {sup 3}He, and on preparations for tests of the distribution and diffusion coefficients of {sup 3}He in the bath.

P. BANGERT; ET AL

2000-08-01

94

Electron electric dipole moment experiment using electric-fieldquantized slow cesium atoms  

Energy Technology Data Exchange (ETDEWEB)

A proof-of-principle electron electric dipole moment (e-EDM)experiment using slow cesium atoms, nulled magnetic fields, and electricfield quantization has been performed. With the ambient magnetic fieldsseen by the atoms reduced to less than 200 pT, an electric field of 6MV/m lifts the degeneracy between states of unequal lbar mF rbar and,along with the low (approximately 3 m/s) velocity, suppresses thesystematic effect from the motional magnetic field. The low velocity andsmall residual magnetic field have made it possible to induce transitionsbetween states and to perform state preparation, analysis, and detectionin regions free of applied static magnetic and electric fields. Thisexperiment demonstrates techniques that may be used to improve the e-EDMlimit by two orders of magnitude, but it is not in itself a sensitivee-EDM search, mostly due to limitations of the laser system.

Amini, Jason M.; Munger Jr., Charles T.; Gould, Harvey.

2007-04-05

95

Numerical prediction of heat affected layer in the EDM of aeronautical alloys  

Science.gov (United States)

Electrical discharge machining is a popular non-traditional machining process, optimum for accurate machining of complex geometries in hard materials. EDM has been used for decades for machining pieces for the aeronautical industry, but surface integrity, and consequently the reliability of the machined parts have been questioned for long time due to the thermal nature of this machining process. In recent years, efforts have been put on modeling of the EDM process, being thermal modeling of the process one promising alternative. In a previous publication an original model of the EDM process was presented and it was used to predict material removal rate and surface finish for the EDM of steel. In the present article the capability of that modeling tool to characterize discharge properties and to predict recast layer distribution when EDMing an aeronautical alloy will be analyzed. EDM process of Inconel 718 has been studied and discharge properties have been obtained for four different EDM regimes. The capability of the model to reflect the behavior of more energetic regimes is discussed. Gathered information has been used to simulate the evolution of the recast layer generation process. Obtained results have been validated comparing them with experimental measurements, revealing a good correlation between predictions and experimental data. Finally, energetic efficiency of the discharge process has been simulated for the adjusted EDM regimes.

Izquierdo, B.; Plaza, S.; Sánchez, J. A.; Pombo, I.; Ortega, N.

2012-10-01

96

Optimizing the Machining Parameters of Micro-EDM for Inconel 718  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This paper aims to study on the feasibility of micron size hole manufacturing using micro Electric Discharge Machining (Micro-EDM). Main and auxiliary unit of the micro-EDM machine tool and their functions are described in some detail. The technological and electrical parameters that are effectiv...

R. Manikandan; R. Venkatesan

97

New Two-loop Contributions to Hadronic EDMs in the MSSM  

CERN Document Server

Flavor-changing terms with CP-violating phases in the quark sector may contribute to the hadronic electric dipole moments (EDMs). However, within the Standard Model (SM), the source of CP violation comes from the unique CKM phase, and it turns out that the EDMs are strongly suppressed. This implies that the EDMs are very sensitive to non-minimal flavor violation structures of theories beyond the SM. In this paper, we discuss the quark EDMs and CEDMs (chromoelectric dipole moments) in the MSSM with general flavor-changing terms in the squark mass matrices. In particular, the charged-Higgs mediated contributions to the down-quark EDM and CEDM are evaluated at two-loop level. We point out that these two-loop contributions may dominate over the one-loop induced gluino or Higgsino contributions even when the squark and gluino masses are around few TeV and \\tan\\beta is moderate.

Hisano, J; Paradisi, P; Hisano, Junji; Nagai, Minoru; Paradisi, Paride

2006-01-01

98

Finding electronic information for health policy advocacy: a guide to improving search results.  

UK PubMed Central (United Kingdom)

PURPOSE: The success of advanced practice registered nurses' (APRNs') health policy advocacy depends on staying well informed about key issues. Searching for high-quality health policy information, however, can be frustrating and time consuming. Busy clinicians need strategies and tips to reduce information overload and to access synthesized research for evidence-based health policy. This article therefore offers APRNs practical guidelines and resources for searching electronic health policy information. DATA SOURCES: Scholarly databases and Internet sites. CONCLUSIONS: Electronic health policy information is generated by a wide variety of public and private organizations and disseminated in hundreds of journals and Web pages. Specialty search tools are needed to retrieve the unindexed gray literature, which includes government documents, agency reports, fact sheets, standards, and statistics not produced by commercial publishers. Further, Internet users need to examine search results with a critical eye for information quality. IMPLICATIONS FOR PRACTICE: Expertise in searching electronic health policy information is a prerequisite for developing APRNs' leadership in political arenas to influence health policy and the delivery of healthcare services.

Olsan TH; Bianchi C; White P; Glessner T; Mapstone PL

2011-12-01

99

Electronic Book Usage Patterns as Observed at an Academic Library: Searches and Viewings  

Directory of Open Access Journals (Sweden)

Full Text Available In 2009, e-book usage statistics were evaluated at Laurentian University, Canada, to provide a better understanding in how the e-book collection has been utilized as well as to give direction for further collection development. The number of e-books, the number of viewings and the number of searches were examined. The size of the collection grew from a single book in 2002 to more than 60,000 in 2008. The pattern of purchase varied from that of bulk purchasing of large e-book collections to a more selective purchase from 2005 to 2007 and then back to that of bulk purchasing in 2008. Both viewings and searches have increased from year to year at a greater pace than the size e-book collection. The number of searches also appeared to provide a viable means to measure the use of an e-book collection rather than relying entirely on viewings or downloads. Ratios were calculated when comparing viewings and searches to the size of the collection. The largest viewings per e-book and searches per e-book ratios were observed in those years when purchasing was done more selectively. It is also clear that the electronic reference collection has seen far greater use then the electronic monographs. Furthermore, usage of electronic monographs also appeared to be directly proportional to the size of the collection.

Alain R. Lamothe

2010-01-01

100

Taguchi Method Implementation in Taper Motion Wire EDM Process Optimization  

Science.gov (United States)

Wire electrical discharge machining (Wire EDM) is a non-conventional metal removal process as well as one of the best manufacturing processes suitable for producing jigs, fixtures, and dies. Among others, the machine is able to cut a workpiece having oblique and taper form. The objective of this paper is to optimize the input parameters of Wire EDM machine, such as no load voltage, capacitor, on-time, off-time, and servo voltage, for machining medium carbon steel ASSAB 760. The Taguchi design of experiments, the signal-to-noise ratio, and analysis of variance are employed to analyze the effects of the input parameters by adopting L18 Taguchi orthogonal array (OA) to conduct experiments using brass wire electrode of 0.2 mm in diameter. In order to achieve the maximum material removal rate (MRR) or the minimum surface roughness (SR), six controllable factors, i.e., the parameters of each at three levels are applied for determining the optimal combination of factors and levels. The results reveal that the MRR and the SR are greatly influenced by the on-time and the taper angle, respectively. Experimental results affirm the effectiveness of the method, and also prove that the Taguchi method is suitable to solving the stated problem within minimum number of experiments as compared to that of a full factorial design.

Martowibowo, S. Y.; Wahyudi, A.

2012-10-01

 
 
 
 
101

A search for single electron production in e+e/sup/minus// annihilation at 29 GeV  

International Nuclear Information System (INIS)

A recent search for single electron events performed with the ASP detector at PEP is presented. No anomalous signal is observed and limits on masses of the supersymmetric partners of the electron and photon are obtained. 7 refs., 1 fig

1988-01-01

102

A search for single electron production in e/sup +/e/sup/minus// annihilation at 29 GeV  

Energy Technology Data Exchange (ETDEWEB)

A recent search for single electron events performed with the ASP detector at PEP is presented. No anomalous signal is observed and limits on masses of the supersymmetric partners of the electron and photon are obtained. 7 refs., 1 fig.

Steele, T.R.

1988-10-01

103

The search for electric dipole moments of light ions in storage rings  

Science.gov (United States)

The Standard Model (SM) of Particle Physics is not capable of accounting for the apparent matter-antimatter asymmetry of our universe. Physics beyond the SM is required and is searched for by (i) employing highest energies (e.g., at LHC), and (ii) striving for ultimate precision and sensitivity (e.g., in the search for electric dipole moments (EDMs)). Permanent EDMs of particles violate both time reversal (T) and parity (P) invariance, and are via the CPT-theorem also CP-violating. Finding an EDM would be a strong indication for physics beyond the SM, and reducing upper limits further provides crucial tests for any corresponding theoretical model, e.g., SUSY. Direct searches for proton and deuteron EDMs bear the potential to reach sensitivities beyond 10-29 e·cm. For an all-electric proton storage ring, this goal is pursued by the US-based srEDM collaboration [1], while the newly founded Jülich-based JEDI collaboration [2] is pursuing an approach using a combined electric-magnetic lattice, which shall provide access to the EDMs of protons, deuterons, and 3He ions in the same machine. In addition, JEDI has recently proposed making a direct measurement of the proton and/or deuteron EDM at COSY using resonant techniques involving Wien filters.

Rathmann, Frank; Saleev, Artem; Nikolaev, N. N.; Jedi; srEdm Collaborations

2013-07-01

104

An alternative search for the electron capture of sup 1 sup 2 sup 3 Te  

CERN Multimedia

A search for the second forbidden electron capture of sup 1 sup 2 sup 3 Te has been performed. A new technique for searches of rare nuclear decays using CdZnTe detectors has been established. After a measuring time of 195 h no signal could be found resulting in a lower half-life limit of T sub 1 sub / sub 2 > 3.2 x 10 sup 1 sup 6 years (95% CL) for this process. This clearly discriminates between existing experimental results which differ by six orders of magnitude, and our data are in strong favour of the result with longer half-lives. (brief report)

Münstermann, D

2003-01-01

105

A search for excited fermions in electron-proton collisions at HERA  

International Nuclear Information System (INIS)

A search for excited states of the standard model fermions was performed using the ZEUS detector at the HERA electron-proton collider, operating at a centre of mass enery of 296 GeV. In a sample corresponding to an integrated luminosity of 0.55 pb-1, no evidence was found for any resonant state decaying into final states composed of a fermion and a gauge boson. Limits on the coupling strength times branching ratio of excited fermions are presented for masses between 50 GeV and 250 GeV, extending previous search regions significantly. (orig.)

1994-01-01

106

EDM constraints and CP asymmetries of B processes in supersymmetric models  

International Nuclear Information System (INIS)

[en] We demonstrate that electric dipole moments (EDMs) strongly constrain possible SUSY contributions to the CP asymmetries of B processes; LL and/or RR flavour mixings between second and third generations are severely restricted by the experimental limit on the mercury EDM, and so therefore are their possible contributions to the CP asymmetries of B->?K and B->?'K. We find that SUSY models with dominant LR and RL mixing through non-universal A-terms is the only way to accommodate the apparent deviation of CP asymmetries from those expected in the Standard Model without conflicting with the EDM bounds or with any other experimental results

2005-07-07

107

EDM constraints and CP asymmetries of B processes in supersymmetric models  

CERN Multimedia

We demonstrate that electric dipole moments (EDMs) strongly constrain possible SUSY contributions to the CP asymmetries of B processes; LL and/or RR flavour mixings between second and third generations are severely restricted by the experimental limit on the mercury EDM, and so therefore are their possible contributions to the CP asymmetries of B --> \\phi K and B --> \\eta' K. We find that SUSY models with dominant LR and RL mixing through non-universal A-terms is the only way to accommodate the apparent deviation of CP asymmetries from those expected in the Standard Model without conflicting with the EDM bounds or with any other experimental results.

Abel, S

2005-01-01

108

The Investigation of EDM Parameters on Electrode Wear Ratio  

Directory of Open Access Journals (Sweden)

Full Text Available Electrical Discharge Machining (EDM) is a well-established machining option for manufacturing geometrically complex or hard material parts that are extremely difficult-to-machine by conventional machining processes. The non-contact machining technique has been continuously evolving from a mere tool and die making process. In this study, the influence of different electro discharge machining parameters (current, pulse on-time, pulse off-time, arc voltage) on the electrode wear ratio as a result of application copper electrode to hot work steel DIN1.2344 has been investigated. Design of the experiment was chosen as full factorial. Artificial neural network has been used to choose proper machining parameters and to reach certain electrode wear ratio. Finally a hybrid model has been designed to reduce the artificial neural network errors. The experiment results indicated a good performance of proposed method in optimization of such a complex and non-linear problems.

Reza Atefi; Navid Javam; Ali Razmavar; Farhad Teimoori

2012-01-01

109

Searching for New Physics beyond the Standard Model in Electric Dipole Moment  

CERN Multimedia

This is the theoretical review of exploration of new physics beyond the Standard Model (SM) in electric dipole moment (EDM) in elementary particles, atoms, and molecule. EDM is very important CP violating phenomenon and sensitive to new physics. Starting with the estimations of EDM of quarks-leptons in the SM, we explore the new signals beyond the SM. However, these works drive us to more wide fronteers where we serach fundamental physics using atoms and molecules and vice versa. Paramagnetic atoms and molecules have great enhancement factor on electron EDM. Diamagnetic atoms and molecules are very sensitive to nuclear P and T odd processes. Thus EDM becomes the key word not only of New Physics but also of unprecedented fruitful collaboration among particle, atomic. molecular physics. This review intends to help such collaboration over the wide range of physicists.

Fukuyama, Takeshi

2012-01-01

110

Neutrino scattering on atomic electrons in searches for the neutrino magnetic moment.  

UK PubMed Central (United Kingdom)

The scattering of a neutrino on atomic electrons is considered in the situation where the energy transferred to the electrons is comparable to the characteristic atomic energies, as relevant to the current experimental search for the neutrino magnetic moment. The process is induced by the standard electroweak interaction as well as by the possible neutrino magnetic moment. Quantum-mechanical sum rules are derived for the inclusive cross section at a fixed energy deposited in the atomic system, and it is shown that the differential over the energy transfer cross section is given, modulo very small corrections, by the same expression as for free electrons, once all possible final states of the electronic system are taken into account. Thus, the atomic effects effectively cancel in the inclusive process.

Voloshin MB

2010-11-01

111

Search for Lepton Flavor Violation in the Decay tau -> electron gamma  

CERN Multimedia

A search for the non-conservation of lepton flavor in the decay tau -> electron gamma has been performed with 2.07 x 10^8 e+e- -> tau+ tau- events collected by the BABAR detector at the PEP-II storage ring at a center-of-mass energy near 10.58 GeV. We find no evidence for a signal and set an upper limit on the branching ratio of BR(tau -> electron gamma) < 1.1 x 10^-7 at 90% confidence level.

Aubert, B; Boutigny, D; Couderc, F; Karyotakis, Yu; Lees, J P; Poireau, V; Tisserand, V; Zghiche, A; Graugès-Pous, E; Palano, A; Pappagallo, M; Pompili, A; Chen, J C; Qi, N D; Rong, G; Wang, P; Zhu, Y S; Eigen, G; Ofte, I; Stugu, B; Abrams, G S; Battaglia, M; Breon, A B; Brown, D N; Button-Shafer, J; Cahn, R N; Charles, E; Day, C T; Gill, M S; Gritsan, A V; Groysman, Y; Jacobsen, R G; Kadel, R W; Kadyk, J; Kerth, L T; Kolomensky, Yu G; Kukartsev, G; Lynch, G; Mir, L M; Oddone, P J; Orimoto, T J; Pripstein, M; Roe, N A; Ronan, M T; Wenzel, W A; Barrett, M; Ford, K E; Harrison, T J; Hart, A J; Hawkes, C M; Morgan, S E; Watson, A T; Fritsch, M; Goetzen, K; Held, T; Koch, H; Lewandowski, B; Pelizaeus, M; Peters, K; Schröder, T; Steinke, M; Boyd, J T; Burke, J P; Chevalier, N; Cottingham, W N; Çuhadar-Dönszelmann, T; Fulsom, B G; Hearty, C; Knecht, N S; Mattison, T S; McKenna, J A; Khan, A; Kyberd, P; Saleem, M; Teodorescu, L; Blinov, A E; Blinov, V E; Bukin, A D; Druzhinin, V P; Golubev, V B; Kravchenko, E A; Onuchin, A P; Serednyakov, S I; Skovpen, Yu I; Solodov, E P; Yushkov, A N; Best, D; Bondioli, M; Bruinsma, M; Chao, M; Curry, S; Eschrich, I; Kirkby, D; Lankford, A J; Lund, P; Mandelkern, M A; Mommsen, R K; Röthel, W; Stoker, D P; Buchanan, C; Hartfiel, B L; Weinstein, A J R; Foulkes, S D; Gary, J W; Long, O; Shen, B C; Wang, K; Zhang, L; Del Re, D; Hadavand, H K; Hill, E J; MacFarlane, D B; Paar, H P; Rahatlou, S; Sharma, V; Berryhill, J W; Campagnari, C; Cunha, A; Dahmes, B; Hong, T M; Mazur, M A; Richman, J D; Verkerke, W; Beck, T W; Eisner, A M; Flacco, C J; Heusch, C A; Kroseberg, J; Lockman, W S; Nesom, G; Schalk, T; Schumm, B A; Seiden, A; Spradlin, P; Williams, D C; Wilson, M G; Albert, J; Chen, E; Dubois-Felsmann, G P; Dvoretskii, A; Hitlin, D G; Minamora, J S; Narsky, I; Piatenko, T; Porter, F C; Ryd, A; Samuel, A; Andreassen, R; Mancinelli, G; Meadows, B T; Sokoloff, M D; Blanc, F; Bloom, P; Chen, S; Ford, W T; Hirschauer, J F; Kreisel, A; Nauenberg, U; Olivas, A; Ruddick, W O; Smith, J G; Ulmer, K A; Wagner, S R; Zhang, J; Chen, A; Eckhart, E A; Soffer, A; Toki, W H; Wilson, R J; Zeng, Q; Altenburg, D; Feltresi, E; Hauke, A; Spaan, B; Brandt, T; Brose, J; Dickopp, M; Klose, V; Lacker, H M; Nogowski, R; Otto, S; Petzold, A; Schubert, J; Schubert, K R; Schwierz, R; Sundermann, J E; Bernard, D; Bonneaud, G R; Grenier, P; Schrenk, S; Thiebaux, C; Vasileiadis, G; Verderi, M; Bard, D J; Clark, P J; Gradl, W; Muheim, F; Playfer, S; Xie, Y; Andreotti, M; Azzolini, V; Bettoni, D; Bozzi, C; Calabrese, R; Cibinetto, G; Luppi, E; Negrini, M; Piemontese, L; Anulli, F; Baldini-Ferroli, R; Calcaterra, A; De Sangro, R; Finocchiaro, G; Patteri, P; Peruzzi, I M; Piccolo, M; Zallo, A; Buzzo, A; Capra, R; Contri, R; Lo Vetere, M; Macri, M; Monge, M R; Passaggio, S; Patrignani, C; Robutti, E; Santroni, A; Tosi, S; Brandenburg, G; Chaisanguanthum, K S; Morii, M; Won, E; Wu, J; Dubitzky, R S; Langenegger, U; Marks, J; Schenk, S; Uwer, U; Schott, G; Bhimji, W; Bowerman, D A; Dauncey, P D; Egede, U; Flack, R L; Gaillard, J R; Nash, J A; Nikolich, M B; Panduro-Vazquez, W; Chai, X; Charles, M J; Mader, W F; Mallik, U; Mohapatra, A K; Ziegler, V; Cochran, J; Crawley, H B; Eyges, V; Meyer, W T; Prell, S; Rosenberg, E I; Rubin, A E; Yi, J; Arnaud, N; Davier, M; Giroux, X; Grosdidier, G; Höcker, A; Le Diberder, F R; Lepeltier, V; Lutz, A M; Oyanguren, A; Petersen, T C; Plaszczynski, S; Rodier, S; Roudeau, P; Schune, M H; Stocchi, A; Wormser, G; Cheng, C H; Lange, D J; Simani, M C; Wright, D M; Bevan, A J; Chavez, C A; Forster, I J; Fry, J R; Gabathuler, E; Gamet, R; George, K A; Hutchcroft, D E; Parry, R J; Payne, D J; Schofield, K C; Touramanis, C; Cormack, C M; Di Lodovico, F; Menges, W; Sacco, R; Brown, C L; Cowan, G; Flächer, H U; Green, M G; Hopkins, D A; Jackson, P S; McMahon, T R; Ricciardi, S; Salvatore, F; Brown, D; Davis, C L; Allison, J; Barlow, N R; Barlow, R J; Edgar, C L; Hodgkinson, M C; Kelly, M P; Lafferty, G D; Naisbit, M T; Williams, J C; Chen, C; Hulsbergen, W D; Jawahery, A; Kovalskyi, D; Lae, C K; Roberts, D A; Simi, G; Blaylock, G; Dallapiccola, C; Hertzbach, S S; Kofler, R; Koptchev, V B; Li, X; Moore, T B; Saremi, S; Stängle, H; Willocq, S; Cowan, R; Koeneke, K; Sciolla, G; Sekula, S J; Spitznagel, M; Taylor, F; Yamamoto, R K; Kim, H; Patel, P M; Robertson, S H; Lazzaro, A; Lombardo, V; Palombo, F; Bauer, J M; Cremaldi, L; Eschenburg, V; Godang, R; Kroeger, R; Reidy, J; Sanders, D A; Summers, D J; Zhao, H W; Brunet, S; Côté, D; Taras, P; Viaud, B; Nicholson, H; Cavallo, N; De Nardo, Gallieno; Fabozzi, F; Gatto, C; Lista, L; Monorchio, D; Paolucci, P; Piccolo, D; Sciacca, C; Baak, M; Bulten, H; Raven, G; Snoek, H L; Wilden, L; Jessop, C P; LoSecco, J M; Allmendinger, T; Benelli, G; Gan, K K; Honscheid, K; Hufnagel, D; Jackson, P D; Kagan, H; Kass, R; Pulliam, T

2006-01-01

112

Search for light-speed anisotropies using Compton scattering of high-energy electrons  

CERN Multimedia

Based on the high sensitivity of Compton scattering off ultra relativistic electrons, the possibility of anisotropies in the speed of light is investigated. The result discussed in this contribution is based on the gamma-ray beam of the ESRF's GRAAL facility (Grenoble, France) and the search for sidereal variations in the energy of the Compton-edge photons. The absence of oscillations yields the two-sided limit of 1.6 x 10^{-14} at 95 % confidence level on a combination of photon and electron coefficients of the minimal Standard Model Extension (mSME). This new constraint provides an improvement over previous bounds by one order of magnitude.

Rebreyend, Dominique

2010-01-01

113

Hadronic EDMs in SUSY SU(5) GUTs with right-handed neutrinos  

International Nuclear Information System (INIS)

We discuss hadronic EDM constraints on the neutrino sector in the SUSY SU(5) GUT with the right-handed neutrinos. The hadronic EDMs are sensitive to the right-handed down-type squark mixings, especially between the second and third generations and between the first and third ones, compared with the other low-energy hadronic observables, and the flavor mixings are induced by the neutrino Yukawa interaction. The current experimental bound of the neutron EDM may imply that the right-handed tau neutrino mass is smaller than about 1014GeV in the minimal supergravity scenario, and it may be improved furthermore in future experiments, such as the deuteron EDM measurement

2004-12-23

114

Hadronic EDMs in SUSY SU(5) GUTs with right-handed neutrinos  

Energy Technology Data Exchange (ETDEWEB)

We discuss hadronic EDM constraints on the neutrino sector in the SUSY SU(5) GUT with the right-handed neutrinos. The hadronic EDMs are sensitive to the right-handed down-type squark mixings, especially between the second and third generations and between the first and third ones, compared with the other low-energy hadronic observables, and the flavor mixings are induced by the neutrino Yukawa interaction. The current experimental bound of the neutron EDM may imply that the right-handed tau neutrino mass is smaller than about 10{sup 14}GeV in the minimal supergravity scenario, and it may be improved furthermore in future experiments, such as the deuteron EDM measurement.

Hisano, Junji [ICRR, University of Tokyo, Kashiwa 277-8582 (Japan); Kakizaki, Mitsuru [ICRR, University of Tokyo, Kashiwa 277-8582 (Japan)]. E-mail: kakizaki@icrr.u-tokyo.ac.jp; Nagai, Minoru [ICRR, University of Tokyo, Kashiwa 277-8582 (Japan); Shimizu, Yasuhiro [Department of Physics, Tohoku University, Sendai 980-8578 (Japan)

2004-12-23

115

Towards the effective tool wear control in micro-EDM milling  

DEFF Research Database (Denmark)

The electrode wear in micro-electrical discharge milling (micro-EDM milling) is one of the main problems to be solved in order to improve machining accuracy. This paper presents an investigation on wear and material removal in micro-EDM milling for selected process parameter combinations typical of rough and finish machining of micro-features in steel. The experiments were performed on state-of-the-art micro-EDM equipment. Based on discharge counting and volume measurements, electrode wear per discharge and material removal per discharge were measured for several energy levels. The influence of the accuracy of volume measurements on the electrode wear per discharge and on the material removal per discharge are discussed, and the issues limiting the applicability of real time wear sensing in micro-EDM milling are presented.

Bissacco, Giuliano; Valentincic, J.

2010-01-01

116

A Search For Neutral D Meson Decaying To Kaon Electron Anti-electron Neutrino (via Mixing) At Cleo  

CERN Document Server

I provide a general overview of particle physics, including a brief introduction to the Standard Model. I describe the theory behind the phenomenon of charm mixing and present a method of searching for D0 ? D0 mixing using the CLEO detector at the Cornell Electron Storage Ring. Analyzing the 9.0fb?1 CLEO II.V, I find a value for the mixing rate, Rmix = 1.10% ± 76%(stat.) ± .68%(syst.). This corresponds to a limit of Rmix < 3.24% at the 95% confidence level.

Sedlack, C

2004-01-01

117

Development of electronic information search and documentation system to preserve knowledge about fast reactors  

International Nuclear Information System (INIS)

The necessity to preserve the knowledge gained in the process of fast reactors development and operation is quite obvious. For this purpose it is necessary to set up electronic libraries and suitable search systems. All the documents that contain certain information about the objects from the given field of knowledge can be referred to as sources of knowledge, i.e. they are articles, preprints, papers, clarification notes, reports, catalogs and other sources. These sources of knowledge can be found in various places, institutions, archives, etc. Usually they are kept in libraries. These sources can have different forms, e.g. electronic, printed, photo, microfiche, etc. The information about these sources of knowledge is placed in catalogs that make the process of searching for required documents much easier. Catalogs usually have a subject heading identifier, index of authors, index of topics, key words and summaries. In a certain sense, catalogs can be also considered as sources of knowledge. There are a lot of various sources of knowledge and experience in the nuclear industry under the subject of 'Fast Reactors'. All of them are in different states in terms of convenience of their use and even possibility to use this knowledge and experience once again. In the best case these sources are in the form of electronic documents that contain not only the information about certain knowledge and experience but this very knowledge and experience in the digitized electronic form. These types of catalogs are the most suitable and simple for their use. There are libraries where knowledge and experience are only kept as nondigitized images of documents. It is not so convenient to work with this information but still it is quite real to get it. If a catalogs only contains information about knowledge and experience but neither is available in electronic form, then in order to get the access to this information it will be necessary either to digitize it or to get its non-electronic copy (usually, hard copy). But even if the entire scope of information about knowledge and experience is presented in electronic catalogs, nevertheless there will be a certain problem to work with it, as to work with a lot of intangible sources may turn out to be much more time- and labor-consuming than to work with it within a single system. Two problems have to be solved in terms of knowledge preservation. The first one is related to transformation of all the sources into electronic form. The second one is related to effective search for the required information by means of the catalogs available. The first problem can be solved rather easily. All the published sources of knowledge can be scanned and transformed into electronic form. Thus, instead of printed catalogs that contain the information about sources of knowledge there will be electronic catalogs. Though this activity seems rather simple, it is still very labor-and time-consuming, because the number of these sources is tremendous. We cannot say that the first problem can be promptly solved because it will require not only great financial expenses but also significant organizational efforts. To solve the second problem is much more complicated, as currently there are no effective search systems oriented towards a specific field of knowledge that could run in heterogeneous and worldwide search environment. At the same time this problem can be solved much faster than the first one, because in this case we mean the development of a software product independent of any organizational measures. The conditions required to cope with this problem imply the availability of electronic catalogs that contain the information about sources of knowledge and their accessibility in the computer network

2005-01-01

118

Ultracold neutrons and the search for the electric dipole moment of the neutron  

International Nuclear Information System (INIS)

The present position on the search for the electric dipole moment (EDM) of the neutron is described and likely progress in the immediate future is discussed with reference to the ultracold neutron source requirements. Motivation for this research comes from the theoretical significance of the neutron EDM. Any mechanism which gives rise to an EDM in a free particle must involve the violation of parity P and time reversal symmetry T. The experimental apparatus at the Institut Laue-Langevin is described and problems associated with stability and systematic error are addressed. 15 refs., 3 figs.

1986-01-01

119

Geant4 Developments for the Radon Electric Dipole Moment Search at TRIUMF  

International Nuclear Information System (INIS)

An experiment is being developed at TRIUMF to search for a time-reversal violating electric dipole moment (EDM) in odd-A isotopes of Rn. Extensive simulations of the experiment are being performed with GEANT4 to study the backgrounds and sensitivity of the proposed measurement technique involving the detection of ? rays emitted following the ? decay of polarized Rn nuclei. GEANT4 developments for the RnEDM experiment include both realistic modelling of the detector geometry and full tracking of the radioactive ?, ?, internal conversion, and x-ray processes, including the ?-ray angular distributions essential for measuring an atomic EDM.

2011-09-23

120

Mutations in EDM2 selectively affect silencing states of transposons and induce plant developmental plasticity.  

UK PubMed Central (United Kingdom)

We previously reported on the A. thaliana gene EDM2, which is required for several developmental processes and race-specific immunity. Although EDM2 encodes a nuclear protein with features commonly observed in epigenetic factors, its role in chromatin silencing remains unknown. Here we demonstrate that silencing states of several transposons in edm2 mutants are altered. Levels of their transcripts anti-correlate with those of the repressive epigenetic marks H3K27me1, H3K9me2, and DNA-methylation at CHG sites. In addition, double mutant analysis revealed epistasis between EDM2 and the major histone H3K9-methyltransferase gene KRYPTONITE/SUVH4 in the control of H3K9me2 and CHG methylation. Moreover, we found that the expressivity of several mutant edm2 phenotypes exhibits stochastic variation reminiscent of mutants of known epigenetic modifiers. We propose that EDM2 affects the expression of transposons and developmentally important genes by modulating levels of repressive chromatin marks in a locus dependent manner.

Tsuchiya T; Eulgem T

2013-01-01

 
 
 
 
121

Search for the top quark in the electron-electron and electron-muon channels at D0  

International Nuclear Information System (INIS)

We discuss preliminary results of a search for top quarks using their decays in two di-lepton, with the D0 detector at Fermilab. The present analysis has been optimized to search for a top with mass near 100c2/GeV, consistent with published limits. In the event sample corresponding to an integrated luminosity of 15pb-1 we observe two events passing all selection cuts. The number of events observed is consistent with the expected number of background events. Consequently, we do not claim the observation of a top decay in the present event sample. We note however, that the kinematic properties of one of the events appear to be far removed from known backgrounds. We discuss the event and show results of the mass likelihood analysis when applied to this event

1993-01-01

122

A New Search For Muon-to-Electron Conversion at Fermilab  

Energy Technology Data Exchange (ETDEWEB)

The Mu2e collaboration will search for coherent, neutrino-less conversion of muons into electrons in the field of a nucleus with a sensitivity improvement of approximately 10,000 over existing limits. Such a lepton flavor-violating reaction probes new physics at a scale unavailable by direct searches at either present or planned high energy colliders. The physics motivation for Mu2e and the design of the muon beamline and spectrometer will be presented, along with a scheme by which the experiment can be mounted in the present Fermilab accelerator complex. We will also examine the prospects for increased sensitivity of as much as two orders-of-magnitude at the proposed Fermilab Project X Linac. (authors)

Bernstein, Robert [Fermi National Accelerator Laboratory - Fermilab, P.O. Box 500, Batavia, IL 60510-5011 (United States); Kolomensky, Yury [University of California, Berkeley, CA 94720 (United States); Lawrence Berkeley National Lab - LBNL, 1 Cyclotron Road, Berkeley, CA 94720 (United States)

2010-07-01

123

A New Search For Muon-to-Electron Conversion at Fermilab  

International Nuclear Information System (INIS)

The Mu2e collaboration will search for coherent, neutrino-less conversion of muons into electrons in the field of a nucleus with a sensitivity improvement of approximately 10,000 over existing limits. Such a lepton flavor-violating reaction probes new physics at a scale unavailable by direct searches at either present or planned high energy colliders. The physics motivation for Mu2e and the design of the muon beamline and spectrometer will be presented, along with a scheme by which the experiment can be mounted in the present Fermilab accelerator complex. We will also examine the prospects for increased sensitivity of as much as two orders-of-magnitude at the proposed Fermilab Project X Linac. (authors)

2010-01-01

124

Search for pair production of the scalar top quark in the electron + muon final state  

International Nuclear Information System (INIS)

We report the result of a search for the pair production of the lightest supersymmetric partner of the top quark (t-tilde1) in pp-bar collisions at a center-of-mass energy of 1.96 TeV at the Fermilab Tevatron collider corresponding to an integrated luminosity of 5.4 fb-1. The scalar top quarks are assumed to decay into a b quark, a charged lepton, and a scalar neutrino (?-tilde), and the search is performed in the electron plus muon final state. No significant excess of events above the standard model prediction is detected, and substantially improved exclusion limits at the 95% C.L. are set in the the (Mt-tilde1, M?-tilde) mass plane.

2011-02-07

125

Search for top in DO using the electron + jets channel with soft ? tagging  

International Nuclear Information System (INIS)

We present preliminary results for the search for the top quark in DO in the electron + jets channel where one of the b quark jets is tagged by means of a soft muon, using 13.5 pb-1 of data. Standard model decay modes for the top quark are assumed. We present the resulting top cross section and error as a function of top mass using this channel combined with the dilepton channel and the untagged lepton + jets channel presented elsewhere in this session. At present, no significant signal for top quark production can be established

1994-01-01

126

Search for top in DO using the electron + jets channel with soft {mu} tagging  

Energy Technology Data Exchange (ETDEWEB)

We present preliminary results for the search for the top quark in DO in the electron + jets channel where one of the b quark jets is tagged by means of a soft muon, using 13.5 pb{sup {minus}1} of data. Standard model decay modes for the top quark are assumed. We present the resulting top cross section and error as a function of top mass using this channel combined with the dilepton channel and the untagged lepton + jets channel presented elsewhere in this session. At present, no significant signal for top quark production can be established.

Raja, R.; DO Collaboration

1994-09-01

127

Search for resonant states in positron-electron scattering using a positron gas target  

International Nuclear Information System (INIS)

Narrow correlated positron-electron peaks discovered in superheavy nuclear collisions may be signatures for previously undetected neutral particle-like objects having masses of 1--2 MeV/c2. We have designed an experiment to definitively test this hypothesis by searching for resonant states formed directly in the scattering of monoenergetic electrons incident on a gas of cold positrons confined magnetically in a Malmberg trap. This technique will provide a hundred-fold improvement in sensitivity to e+e- resonances compared to previous positron-beam, thin-foil scattering experiments. Together with a recoil-shadow technique, this experiment will explore a five decade range in neutral-particle lifetimes (10-13s to 10-8s) which cannot be probed directly to other methods. 14 refs., 2 figs., 1 tab

1990-01-01

128

Search for Oscillation of the Electron-Capture Decay Probability of Pm-142  

Energy Technology Data Exchange (ETDEWEB)

We have searched for time modulation of the electron capture decay probability of 142Pm in an attempt to confirm a recent claim from a group at the Gesellschaft fur Schwerionenforschung (GSI). We produced 142Pm via the 124Sn(23Na, 5n)142Pm reaction at the Berkeley 88-Inch Cyclotron with a bombardment time short compared to the reported modulation period. Isotope selection by the Berkeley Gas-filled Separator is followed by implantation and a long period of monitoring the 142Nd K alpha x-rays from the daughter. The decay time spectrum of the x-rays is well-described by a simple exponential and the measured half-life of 40.68(53) seconds is consistent with the accepted value. We observed no oscillatory modulation at the proposed frequency at a level 31 times smaller than that reported by Litvinov (Phys. Lett. B 664 (2008) 162). A literature search for previous experiments that might have been sensitive to the reported modulation uncovered another example in 142Eu electron-capture decay. A reanalysis of the published data shows no oscillatory behavior.

Vetter, Paul A; Vetter, Paul; Clark, Roderick; Dvorak, Jan; Freedman, Stuart; Gregorich, Kenneth; Jeppesen, Henrik; Mittelberger, Daniel; Wiedeking, Mathis

2008-07-03

129

Experimental Study on Influence of Process Variables on Crater Dimensions in Micro- EDM of ?-Titanium Aluminide  

International Nuclear Information System (INIS)

In the present work the effect of different dielectric mediums in micro-EDM of ?-Titanium Aluminide alloy have been investigated. Experiments were conducted both in the absence (dry conditions) and in presence of dielectric (EDM oil).Circular craters were produced both in the presence and absence of dielectric fluid using varying micro-EDM process variables i.e. open circuit voltage, discharge capacitance, pulse frequency and pulse-on-time. Over cut was measured from optical microscope images using Image Analyzer software. Influences of process variables and optimal conditions for minimum over cut on crater dimensions were investigated. ANOVA test which shows that capacitance of RC circuit contributes significantly in crater formation followed by pulse frequency. Optical photographs exhibit that over cut are less in air medium compared to oil medium.

2011-01-17

130

Experimental Study on Influence of Process Variables on Crater Dimensions in Micro- EDM of ? -Titanium Aluminide  

Science.gov (United States)

In the present work the effect of different dielectric mediums in micro-EDM of ?-Titanium Aluminide alloy have been investigated. Experiments were conducted both in the absence (dry conditions) and in presence of dielectric (EDM oil).Circular craters were produced both in the presence and absence of dielectric fluid using varying micro-EDM process variables i.e. open circuit voltage, discharge capacitance, pulse frequency and pulse-on-time. Over cut was measured from optical microscope images using Image Analyzer software. Influences of process variables and optimal conditions for minimum over cut on crater dimensions were investigated. ANOVA test which shows that capacitance of RC circuit contributes significantly in crater formation followed by pulse frequency. Optical photographs exhibit that over cut are less in air medium compared to oil medium.

Mitra, S.; Paul, G.; Sarkar, S.; Nagahanumaiah

2011-01-01

131

Proceedings of the International Conference on Educational Data Mining (EDM) (5th, Chania, Greece, June 19-21, 2012)  

Science.gov (United States)

The 5th International Conference on Educational Data Mining (EDM 2012) is held in picturesque Chania on the beautiful Crete island in Greece, under the auspices of the International Educational Data Mining Society (IEDMS). The EDM 2012 conference is a leading international forum for high quality research that mines large data sets of educational…

International Educational Data Mining Society, 2012

2012-01-01

132

Demonstration of Surface Electron Rejection with Interleaved Germanium Detectors for Dark Matter Search  

CERN Multimedia

SuperCDMS, a direct search for WIMPs, is currently operating a 9-kg array of cryogenic germanium (Ge) detectors in the Soudan Underground Laboratory. These detectors, known as iZIPs, use ionization and phonon sensors placed symmetrically on both sides of a Ge crystal to measure both charge and athermal phonons from each particle interaction. The information from each event provides excellent discrimination between electron recoils and nuclear recoils, as well as discrimination between events on the detector surface and those in the interior. To demonstrate the surface electron rejection capabilities, two $^{210}$Pb sources were installed facing detectors, producing $\\sim$130 beta decays/hr. In $\\sim$800 live hours, no events leaked into the WIMP signal region in the recoil energy range 8--115 keVr, providing an upper limit to the surface event leakage fraction of $1.7 \\times 10^{-5}$ at 90% C.L. This rejection factor demonstrates that surface electrons would produce $< 0.6$ event background in the 0.3 ton-...

Agnese, R; Balakishiyeva, D; Thakur, R Basu; Bauer, D A; Borgland, A; Brandt, D; Brink, P L; Bunker, R; Cabrera, B; Caldwell, D O; Cerdeno, D G; Chagani, H; Cherry, M; Cooley, J; Cornell, B; Crewdson, C H; Cushman, P; Daal, M; Di Stefano, P C F; Silva, E Do Couto E; Doughty, T; Esteban, L; Fallows, S; Figueroa-Feliciano, E; Fox, J; Fritts, M; Godfrey, G L; Golwala, S R; Hall, J; Harris, H R; Hasi, J; Hertel, S A; Hines, B A; Hofer, T; Holmgren, D; Hsu, L; Huber, M E; Jastram, A; Kamaev, O; Kara, B; Kelsey, M H; Kenany, S A; Kennedy, A; Kenney, C J; Kiveni, M; Koch, K; Loer, B; Asamar, E Lopez; Mahapatra, R; Mandic, V; Martinez, C; McCarthy, K A; Mirabolfathi, N; Moffatt, R A; Moore, D C; Nadeau, P; Nelson, R H; Novak, L; Page, K; Partridge, R; Pepin, M; Phipps, A; Prasad, K; Pyle, M; Qiu, H; Radpour, R; Rau, W; Redl, P; Reisetter, A; Resch, R W; Ricci, Y; Saab, T; Sadoulet, B; Sander, J; Schmitt, R; Schneck, K; Schnee, R W; Scorza, S; Seitz, D; Serfass, B; Shank, B; Speller, D; Tomada, A; Villano, A N; Welliver, B; Wright, D H; Yellin, S; Yen, J J; Young, B A; Zhang, J

2013-01-01

133

ARCHITECTURE AND METHODS OF ELECTRONIC DOCUMENT SCIENTIFIC INSTITUTIONS ??????????? ? ?????? ?????? ???????????? ???????????????? ??????? ??????????? ??????????? ?? ?????? ?????? ???????????? ?????????????? ???????? ????????  

Digital Repository Infrastructure Vision for European Research (DRIVER)

?roposed methods of electronic document management systems (EDMS) architecture development in scientific organizations. The main forms of documents in scientific organizations were discovered. The generalized classification of documents according to their types and subtypes was created. The appropr...

????????????, ???????? ??????????; ???????? ????????? ????’??????? ?????????? ???????????? «???????»

134

A Study of Hole Drilling on Stainless Steel AISI 431 by EDM Using Brass Tube Electrode  

Directory of Open Access Journals (Sweden)

Full Text Available When a depth hole is drilled by EDM, taper is occurred which is not desired in the process. This research was focused on influence of EDM parameters on material removal rate (MRR), electrode wear rate (EWR) and tapered hole of martensitic stainless steel AISI 431. The considered factors consist of electrical current, on-time, duty factor, water pressure and servo rate. The experimental results reveal that MRR increases when increasing of servo rate. The taper of hole increases with increasing of electrical current and servo rate. However, it is reverse proportion to water pressure and duty factor.

Pichai Janmanee and Apiwat Muttamara

2011-01-01

135

Search for W' bosons decaying to an electron and a neutrino with the D0 detector  

CERN Multimedia

This Letter describes the search for a new heavy charged gauge boson W' decaying into an electron and a neutrino. The data were collected with the D0 detector at the Fermilab Tevatron proton-antiproton Collider at a center-of-mass energy of 1.96 TeV, and correspond to an integrated luminosity of about 1 inverse femtobarn. Lacking any significant excess in the data in comparison with known processes, an upper limit is set on the production cross section times branching fraction, and a W' boson with mass below 1.00 TeV can be excluded at the 95% C.L., assuming standard-model-like couplings to fermions. This result significantly improves upon previous limits, and is the most stringent to date.

Abazov, V; Abolins, M; Acharya, B S; Adams, M; Adams, T; Aguiló, E; Ahn, S H; Ahsan, M; Alexeev, G D; Alkhazov, G; Alton, A; Alverson, G; Alves, G A; Anastasoaie, M; Ancu, L S; Andeen, T; Anderson, S; Andrieu, B; Anzelc, M S; Arnoud, Y; Arov, M; Arthaud, M; Askew, A; Åsman, B; Assis-Jesus, A C S; Atramentov, O; Autermann, C; Avila, C; Ay, C; Badaud, F; Baden, A; Bagby, L; Baldin, B; Bandurin, D V; Banerjee, S; Banerjee, P; Barberis, E; Barfuss, A F; Bargassa, P; Baringer, P; Barreto, J; Bartlett, J F; Bassler, U; Bauer, D; Beale, S; Bean, A; Begalli, M; Begel, M; Belanger-Champagne, C; Bellantoni, L; Bellavance, A; Benítez, J A; Beri, S B; Bernardi, G; Bernhard, R; Bertram, I; Besançon, M; Beuselinck, R; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Biscarat, C; Blazey, G; Blekman, F; Blessing, S; Bloch, D; Bloom, K; Böhnlein, A; Boline, D; Bolton, T A; Borissov, G; Bose, T; Brandt, A; Brock, R; Brooijmans, G; Bross, A; Brown, D; Buchanan, N J; Buchholz, D; Bühler, M; Büscher, V; Bunichev, S; Burdin, S; Burke, S; Burnett, T H; Buszello, C P; Butler, J M; Calfayan, P; Calvet, S; Cammin, J; Carvalho, W; Casey, B C K; Cason, N M; Castilla-Valdez, H; Chakrabarti, S; Chakraborty, D; Chan, K M; Chan, K; Chandra, A; Charles, F; Cheu, E; Chevallier, F; Cho, D K; Choi, S; Choudhary, B; Christofek, L; Christoudias, T; Cihangir, S; Claes, D; Coadou, Y; Cooke, M; Cooper, W E; Corcoran, M; Couderc, F; Cousinou, M C; Crepe-Renaudin, S; Cutts, D; Cwiok, M; Da Motta, H; Das, A; Davies, G; De, K; De Jong, S J; De La Cruz-Burelo, E; De Oliveira Martins, C; Degenhardt, J D; Déliot, F; Demarteau, M; Demina, R; Denisov, D; Denisov, S P; Desai, S; Diehl, H T; Diesburg, M; Dominguez, A; Dong, H; Dudko, L V; Duflot, L; Dugad, S R; Duggan, D; Duperrin, A; Dyer, J; Dyshkant, A; Eads, M; Edmunds, D; Ellison, J; Elvira, V D; Enari, Y; Eno, S; Ermolov, P; Evans, H; Evdokimov, A; Evdokimov, V N; Ferapontov, A V; Ferbel, T; Fiedler, F; Filthaut, F; Fisher, W; Fisk, H E; Ford, M; Fortner, M; Fox, H; Fu, S; Fuess, S; Gadfort, T; Galea, C F; Gallas, E; Galyaev, E; García, C; García-Bellido, A; Gavrilov, V; Gay, P; Geist, W; Gelé, D; Gerber, C E; Gershtein, Yu; Gillberg, D; Ginther, G; Gollub, N; Gómez, B; Goussiou, A; Grannis, P D; Greenlee, H; Greenwood, Z D; Gregores, E M; Grenier, G; Gris, P; Grivaz, J F; Grohsjean, A; Grünendahl, S; Grünewald, M W; Guo, J; Guo, F; Gutíerrez, P; Gutíerrez, G; Haas, A; Hadley, N J; Haefner, P; Hagopian, S; Haley, J; Hall, I; Hall, R E; Han, L; Hanagaki, K; Hansson, P; Harder, K; Harel, A; Harrington, R; Hauptman, J M; Hauser, R; Hays, J; Hebbeker, T; Hedin, D; Hegeman, J G; Heinmiller, J M; Heinson, A P; Heintz, U; Hensel, C; Herner, K; Hesketh, G; Hildreth, M D; Hirosky, R; Hobbs, J D; Hoeneisen, B; Hoeth, H; Hohlfeld, M; Hong, S J; Hossain, S; Houben, P; Hu, Y; Hubacek, Z; Hynek, V; Iashvili, I; Illingworth, R; Ito, A S; Jabeen, S; Jaffré, M; Jain, S; Jakobs, K; Jarvis, C; Jesik, R; Johns, K; Johnson, C; Johnson, M; Jonckheere, A; Jonsson, P; Juste, A; Käfer, D; Kajfasz, E; Kalinin, A M; Kalk, J R; Kalk, J M; Kappler, S; Karmanov, D; Kasper, P; Katsanos, I; Kau, D; Kaur, R; Kaushik, V; Kehoe, R; Kermiche, S; Khalatyan, N; Khanov, A; Kharchilava, A; Kharzheev, Yu M; Khatidze, D; Kim, H; Kim, T J; Kirby, M H; Kirsch, M; Klima, B; Kohli, J M; Konrath, J P; Kopal, M; Korablev, V M; Kozelov, A V; Krop, D; Kühl, T; Kumar, A; Kunori, S; Kupco, A; Kurca, T; Kvita, J; Lacroix, F; Lam, D; Lammers, S; Landsberg, G; Lebrun, P; Lee, W M; Leflat, A; Lehner, F; Lellouch, J; Lévêque, J; Lewis, P; Li, J; Li, Q Z; Li, L; Lietti, S M; Lima, J G R; Lincoln, D; Linnemann, J; Lipaev, V V; Lipton, R; Liu, Y; Liu, Z; Lobo, L; Lobodenko, A; Lokajícek, M; Love, P; Lubatti, H J; Lyon, A L; Maciel, A K A; Mackin, D; Madaras, R J; Mättig, P; Magass, C; Magerkurth, A; Mal, P K; Malbouisson, H B; Malik, S; Malyshev, V L; Mao, H S; Maravin, Y; Martin, B; McCarthy, R; Melnitchouk, A; Mendes, A; Mendoza, L; Mercadante, P G; Merkin, M; Merritt, K W; Meyer, J; Meyer, A; Millet, T; Mitrevski, J; Molina, J; Mommsen, R K; Mondal, N K; Moore, R W; Moulik, T; Muanza, G S; Mulders, M; Mulhearn, M; Mundal, O; Mundim, L; Nagy, E; Naimuddin, M; Narain, M; Naumann, N A; Neal, H A; Negret, J P; Neustroev, P; Nilsen, H; Nogima, H; Nomerotski, A; Novaes, S F; Nunnemann, T; O'Dell, V; O'Neil, D C; Obrant, G; Ochando, C; Onoprienko, D; Oshima, N; Osta, J; Otec, R; Oteroy-Garzon, G J; Owen, M; Padley, P; Pangilinan, M; Parashar, N; Park, S J; Park, S K; Parsons, J; Partridge, R; Parua, N; Patwa, A; Pawloski, G; Penning, B; Perfilov, M; Peters, K; Peters, Y; Petroff, P; Petteni, M; Piegaia, R; Piper, J; Pleier, M A; Podesta-Lerma, P L M; Podstavkov, V M; Pogorelov, Y; Pol, M E; Polozov, P; Pope, B G; Popov, A V; Potter, C; Prado da Silva, W L; Prosper, H B; Protopopescu, S; Qian, J; Quadt, A; Quinn, B; Rakitine, A; Rangel, M S; Ranjan, K

2007-01-01

136

Proposal for an electron antineutrino disappearance search using high-rate ^{8}li production and decay.  

UK PubMed Central (United Kingdom)

This paper introduces an experimental probe of the sterile neutrino with a novel, high-intensity source of electron antineutrinos from the production and subsequent decay of ^{8}Li. When paired with an existing ?1 kton scintillator-based detector, this ?E_{?}?=6.4 MeV source opens a wide range of possible searches for beyond standard model physics via studies of the inverse beta decay interaction ?[over ¯]_{e}+p?e^{+}+n. In particular, the experimental design described here has unprecedented sensitivity to ?[over ¯]_{e} disappearance at ?m^{2}?1??eV^{2} and features the ability to distinguish between the existence of zero, one, and two sterile neutrinos.

Bungau A; Adelmann A; Alonso JR; Barletta W; Barlow R; Bartoszek L; Calabretta L; Calanna A; Campo D; Conrad JM; Djurcic Z; Kamyshkov Y; Shaevitz MH; Shimizu I; Smidt T; Spitz J; Wascko M; Winslow LA; Yang JJ

2012-10-01

137

MiniBooNE: first results on the muon-to-electron neutrino oscillation search  

Energy Technology Data Exchange (ETDEWEB)

MiniBooNE's first results on a search for an electron neutrino excess in a muon neutrino beam are presented, together with an analysis of the data within a two neutrino {nu}{sub {mu}} {yields} {nu}{sub e} appearance-only oscillation context. MiniBooNE finds excellent agreement between data and Standard Model predictions in the oscillation analysis energy region. If neutrino and antineutrino oscillations are the same, MiniBooNE excludes at {approx} 98% confidence level the two neutrino {nu}{sub {mu}} {yields} {nu}{sub e} appearance-only oscillation interpretation of the LSND anomaly. MiniBooNE also finds a discrepancy at energies below the oscillation analysis range, which is currently not understood and under investigation.

Sorel, M.; /Columbia U.

2007-10-01

138

Search for electron neutrino appearance in a 250 km long-baseline experiment  

International Nuclear Information System (INIS)

[en] We present a search for electron neutrino appearance from accelerator-produced muon neutrinos in the K2K long-baseline neutrino experiment. One candidate event is found in the data corresponding to an exposure of 4.8x1019 protons on target. The expected background in the absence of neutrino oscillations is estimated to be 2.4±0.6 events and is dominated by misidentification of events from neutral current ?0 production. We exclude the ?? to ?e oscillations at 90% C.L. for the effective mixing angle in the 2-flavor approximation of sin22??e(?(1/2)sin22?13)>0.15 at ?m?e2=2.8x10-3 eV2, the best-fit value of the ?? disappearance analysis in K2K. The most stringent limit of sin22??e?e2=6x10-3 eV2

2004-07-30

139

Search for Oscillation of the Electron-Capture Decay Probability of $^{142}$Pm  

CERN Multimedia

We have searched for time modulation of the electron capture decay probability of $^{142}$Pm in an attempt to confirm a recent claim from a group at the Gesellschaft f\\"{u}r Schwerionenforschung (GSI). We produced $^{142}$Pm via the $^{124}$Sn($^{23}$Na, 5n)$^{142}$Pm reaction at the Berkeley 88-Inch Cyclotron with a bombardment time short compared to the reported modulation period. Isotope selection by the Berkeley Gas-filled Separator is followed by implantation and a long period of monitoring the $^{142}$Nd K$_{\\alpha}$ x-rays from the daughter. The decay time spectrum of the x-rays is well-described by a simple exponential and the measured half-life of 40.68(53) seconds is consistent with the accepted value. We observed no oscillatory modulation at the proposed frequency at a level 31 times smaller than that reported by Litvinov {\\it et al.} (Phys. Lett. B 664 (2008) 162; arXiv:0801.2079 [nucl-ex]). A literature search for previous experiments that might have been sensitive to the reported modulation unco...

Vetter, P A; Dvorak, J; Freedman, S J; Gregorich, K E; Jeppesen, H B; Mittelberger, D; Wiedeking, M

2008-01-01

140

New Results from MiniBooNE: A Search for Electron Antineutrino Appearance at $\\sim$1 eV$^2$  

CERN Document Server

These proceedings summarize the first MiniBooNE electron antineutrino appearance search results, corresponding to a data sample collected for 3.39$\\times10^{20}$ protons on target (POT). The search serves as a direct test of the LSND oscillation signature, and provides complementary information which can be used in studies addressing the MiniBooNE neutrino-mode low-energy excess.

Karagiorgi, G

2009-01-01

 
 
 
 
141

Towards semantic search and inference in electronic medical records: An approach using concept--based information retrieval.  

UK PubMed Central (United Kingdom)

BACKGROUND: This paper presents a novel approach to searching electronic medical records that is based on concept matching rather than keyword matching. AIM: The concept-based approach is intended to overcome specific challenges we identified in searching medical records. METHOD: Queries and documents were transformed from their term-based originals into medical concepts as defined by the SNOMED-CT ontology. RESULTS: Evaluation on a real-world collection of medical records showed our concept-based approach outperformed a keyword baseline by 25% in Mean Average Precision. CONCLUSION: The concept-based approach provides a framework for further development of inference based search systems for dealing with medical data.

Koopman B; Bruza P; Sitbon L; Lawley M

2012-01-01

142

Measuring the electric dipole moment of the electron with YbF molecules  

CERN Multimedia

A molecular beam interferometer has been built. The interferometer is capable of measuring spectacularly small shifts in energy levels of the YbF molecule, such as those that might be induced if the electron has an electric dipole moment (EDM). This device has been used to make a precise measurement of the electron EDM. The result, (-0.3 +- 4.0) x 10 sup - sup 2 sup 6 e centre dot cm, is the most sensitive measurement of the electron EDM made in a molecular environment. Furthermore, the results indicate that further work could substantially increase this sensitivity.

Hudson, J J

2001-01-01

143

Avaliação da geração de microtrincas do aço rápido ABNT M2 no processo EDM com adição de SiC = Evaluation of microcrack formation of ABNT M2 high speed steel in the EDM process, with addition of silicon carbide powder  

Directory of Open Access Journals (Sweden)

Full Text Available É sabido que a Usinagem por Descargas Elétricas (EDM) é um processo térmico em que pode haver temperaturas muito elevadas (superiores a 1.200°C) na região de usinagem. Consequentemente é fácil de entender o fato de as peças usinadas por EDM apresentarem camadas superficiais endurecidas, refundidas e com elevado número de microtrincas superficiais. A formação de microtrincas está associada com o desenvolvimento de altas tensões térmicas que excedem a tensão máxima de resistência do material. Além disso, as microtrincas superficiais penetram em profundidade com extensões que dependem da energia de descarga. O trabalho proposto tem por objetivo estudar o efeito da adição de pó de SiC em vários fluidos dielétricos, sobre a geração de microtrincas superficiais, no aço rápido ABNT M2, durante a usinagem por descargas elétricas. Os resultados apresentados mostramredução da quantidade de microtrincas nas superfícies usinadas, quando se adiciona pó de SiC ao dielétrico, quando comparadas com as usinadas com EDM convencional.It is known that Electrical Discharge Machining (EDM) is a thermal process in which extremely high temperatures (in excess of 1200°C) can occur in the machining area. Consequently, it is easy tounderstand that during each electric discharge, high temperatures are generated, causing local fusion or even evaporation of the machined material. In each discharge, a crater is formed in the material and a small crater is formed in the electrode. Of every meltedmaterial produced in each discharge, only 15% or less is removed using dielectric fluid. The remaining melted material solidifies, forming a wrinkled surface. The characteristics of theobtained surface – overlap of craters, globules of sullage, chimneys, bubbles (formed when the gases arrested are liberated through the resolidified material) – are revealed through an analysis using a scanning electron microscope. The proposed work has as its objective to study the effect of the addition of SiC powder into several dielectric fluids, on microcrack formation of high-speed steel (ABNT M2), during electrical discharge machining. The results show that the samples machined with the addition of SiC powders presentedsignificant reduction in the number of microcracks in the machined surface, when compared with those machined with conventional EDM.

Jean Robert Pereira Rodrigues; Claudionor Cruz; Sinésio Domingues Franco; José Roberto Pereira Rodrigues; Wellinton de Assunção

2008-01-01

144

Secondary scintillation yield from GEM and THGEM gaseous electron multipliers for direct dark matter search  

International Nuclear Information System (INIS)

The search for alternatives to PMTs as photosensors in optical TPCs for rare event detection has significantly increased in the last few years. In particular, in view of the next generation large volume detectors, the use of photosensors with lower natural radioactivity, such as large area APDs or GM-APDs, with the additional possibility of sparse surface coverage, triggered the intense study of secondary scintillation production in micropattern electron multipliers, such as GEMs and THGEMs, as alternatives to the commonly used uniform electric field region between two parallel meshes. The much higher scintillation output obtained from the electron avalanches in such microstructures presents an advantage in those situations. The accurate knowledge of the amount of such scintillation is important for correct detector simulation and optimization. It will also serve as a benchmark for software tools developed and/or under development for the calculation of the amount of such scintillation. The secondary scintillation yield, or electroluminescence yield, in the electron avalanches of GEMs and THGEMs operating in gaseous xenon and argon has been determined for different gas pressures. At 1 bar, THGEMs deliver electroluminescence yields that are more than one order of magnitude higher when compared to those achieved in GEMs and two orders of magnitude when compared to those achieved in a uniform field gap. The THGEM electroluminescence yield presents a faster decrease with pressure when comparing to the GEM electroluminescence yield, reaching similar values to what is achieved in GEMs for xenon pressures of 2.5 bar, but still one order of magnitude higher than that produced in a uniform field gap. Another exception is the GEM operating in argon, which presents an electroluminescence yield similar to that produced in a uniform electric field gap, while the THGEM achieves yields that are more than one order of magnitude higher.

2012-07-24

145

Analysis of aerosol emission and hazard evaluation of electrical discharge machining (EDM) process.  

Science.gov (United States)

The safety and environmental aspects of a manufacturing process are important due to increased environmental regulations and life quality. In this paper, the concentration of aerosols in the breathing zone of the operator of Electrical Discharge Machining (EDM), a commonly used non traditional manufacturing process is presented. The pattern of aerosol emissions from this process with varying process parameters such as peak current, pulse duration, dielectric flushing pressure and the level of dielectric was evaluated. Further, the HAZOP technique was employed to identify the inherent safety aspects and fire risk of the EDM process under different working conditions. The analysis of aerosol exposure showed that the concentration of aerosol was increased with increase in the peak current, pulse duration and dielectric level and was decreased with increase in the flushing pressure. It was also found that at higher values of peak current (7A) and pulse duration (520 micros), the concentration of aerosols at breathing zone of the operator was above the permissible exposure limit value for respirable particulates (5 mg/m(3)). HAZOP study of the EDM process showed that this process is vulnerable to fire and explosion hazards. A detailed discussion on preventing the fire and explosion hazard is presented in this paper. The emission and risk of fire of the EDM process can be minimized by selecting proper process parameters and employing appropriate control strategy. PMID:20720340

Jose, Mathew; Sivapirakasam, S P; Surianarayanan, M

2010-01-01

146

Analysis of aerosol emission and hazard evaluation of electrical discharge machining (EDM) process.  

UK PubMed Central (United Kingdom)

The safety and environmental aspects of a manufacturing process are important due to increased environmental regulations and life quality. In this paper, the concentration of aerosols in the breathing zone of the operator of Electrical Discharge Machining (EDM), a commonly used non traditional manufacturing process is presented. The pattern of aerosol emissions from this process with varying process parameters such as peak current, pulse duration, dielectric flushing pressure and the level of dielectric was evaluated. Further, the HAZOP technique was employed to identify the inherent safety aspects and fire risk of the EDM process under different working conditions. The analysis of aerosol exposure showed that the concentration of aerosol was increased with increase in the peak current, pulse duration and dielectric level and was decreased with increase in the flushing pressure. It was also found that at higher values of peak current (7A) and pulse duration (520 micros), the concentration of aerosols at breathing zone of the operator was above the permissible exposure limit value for respirable particulates (5 mg/m(3)). HAZOP study of the EDM process showed that this process is vulnerable to fire and explosion hazards. A detailed discussion on preventing the fire and explosion hazard is presented in this paper. The emission and risk of fire of the EDM process can be minimized by selecting proper process parameters and employing appropriate control strategy.

Jose M; Sivapirakasam SP; Surianarayanan M

2010-01-01

147

Study of surface integrity using the small area EDM process with a copper-tungsten electrode  

Energy Technology Data Exchange (ETDEWEB)

The present study performs the small area electro-discharge machining (EDM) process with a low wear-rate copper-tungsten electrode of diameter 1.5 mm to establish the influence of the EDM parameters on various aspects of the surface integrity of AISI 1045 carbon steel. The residual stress induced by the EDM process is measured using the Hole-Drilling Strain-Gage Method. The experimental results reveal that the values of material removal rate (MRR), surface roughness (SR), hole enlargement (HE), average white layer thickness (WLT), and induced residual stress tend to increase at higher values of pulse current and pulse-on duration. However, for an extended pulse-on duration, it is noted that the MRR, SR, and surface crack density all decrease. Furthermore, the results indicate that obvious cracks are always evident in thicker white layers. A smaller pulse current (i.e. 1 A) tends to increase the surface crack density, while a prolonged pulse-on duration (i.e. 23 {mu}s) widens the opening degree of the surface crack, thereby reducing the surface crack density. The EDM hole drilling process induces a compressive residual stress within the workpiece. A linear relationship is identified between the maximum residual stress and the average white layer thickness. It is determined that the residual stress can be controlled effectively by specifying an appropriate pulse-on duration.

Lee, H.-T.; Hsu, F.-C.; Tai, T.-Y

2004-01-15

148

Study of surface integrity using the small area EDM process with a copper-tungsten electrode  

International Nuclear Information System (INIS)

The present study performs the small area electro-discharge machining (EDM) process with a low wear-rate copper-tungsten electrode of diameter 1.5 mm to establish the influence of the EDM parameters on various aspects of the surface integrity of AISI 1045 carbon steel. The residual stress induced by the EDM process is measured using the Hole-Drilling Strain-Gage Method. The experimental results reveal that the values of material removal rate (MRR), surface roughness (SR), hole enlargement (HE), average white layer thickness (WLT), and induced residual stress tend to increase at higher values of pulse current and pulse-on duration. However, for an extended pulse-on duration, it is noted that the MRR, SR, and surface crack density all decrease. Furthermore, the results indicate that obvious cracks are always evident in thicker white layers. A smaller pulse current (i.e. 1 A) tends to increase the surface crack density, while a prolonged pulse-on duration (i.e. 23 ?s) widens the opening degree of the surface crack, thereby reducing the surface crack density. The EDM hole drilling process induces a compressive residual stress within the workpiece. A linear relationship is identified between the maximum residual stress and the average white layer thickness. It is determined that the residual stress can be controlled effectively by specifying an appropriate pulse-on duration.

2004-01-15

149

OPTIMIZATION OF OPERATING PARAMETERS FOR EDM PROCESS BASED ON THE TAGUCHI METHOD AND ARTIFICIAL NEURAL NETWORK  

Directory of Open Access Journals (Sweden)

Full Text Available In this paper the complexity of electrical discharge machining process which is very difficult to determine optimal cutting parameters for improving cutting performance has been reported. Optimization of operating parameters is an important step in machining, particularly for operating unconventional machiningprocedure like EDM. A suitable selection of machining parameters for the electrical discharge machining process relies heavily on the operators’ technologies and experience because of their numerous and diverse range. Machining parameters tables provided by the machine tool builder can not meet the operators’ requirements, since for anarbitrary desired machining time for a particular job, they do not provide the optimal machining conditions. An approach to determine parameters setting is proposed. Based on the Taguchi parameter design method and the analysis of variance, the significant factors affecting the machining performance such as total machining time, oversize and taper for a hole machined by EDM process, are determined.Artificial neural networks are highly flexible modeling tools with an ability to learn the mapping between input variables and output feature spaces. The superiority of using artificial neural networks inmodeling machining processes make easier to model the EDM process with dimensional input and output spaces. On the basis of the developed neural network model, for a required total machining time, oversize and taper the corresponding process parameters to be set in EDM by using the developed and trained ANN are determined.

A.Thillaivanan,; P. Asokan,; K.N.Srinivasan,; R.Saravanan

2010-01-01

150

Econometric estimates of the EDM model (Italian version of Frankfurt and Cambridge model)  

Energy Technology Data Exchange (ETDEWEB)

The work done to update and improve the existing version of EDM/Italy is described. The debugging, checking and final delivery of the system was done. Then a new base case for forecasts was developed. EDM/Italy data base was updated to 1979 and many data were corrected after a careful checking, particularly for 1976-1978. Following some ENEA requirements, gas series were split into natural and other gases and all non private land transportation consumption were concentrated in LT sector. Single price indexes for energy products were substituted by a matrix of different prices for different sector uses of fuels. The remaking of estimations has been extensive and the outcome has been a set of more reliable and price sensitive equations, both for total and single product demands, although the main basic features of original EDM/Italy did not change dramatically. Finally a test was performed of the so called Cambridge system specification of EDM, against the Frankfurt single equation version, which is used at present for Italy. The main conclusion was that the effort to substitute the Cambridge version for the existing one would not be worthwhile, but there's some evidence that the latter may make use of the former, as a helpful tool for testing its properties.

1983-01-01

151

Optimization Of Edm Parameters Using Taguchi Method And Grey Relational Analysis For Mild Steel Is 2026  

Directory of Open Access Journals (Sweden)

Full Text Available Optimization is one of the techniques used in manufacturing sectors to arrive for the best manufacturing conditions, which is an essential need for industries towards manufacturing of quality products at lower cost. This paper aims to investigate the optimal set of process parameters such as current, pulse ON and OFF time in Electrical Discharge Machining (EDM) process to identify the variations in three performance characteristics such as rate of material removal, wear rate on tool, and surface roughness value on the work material for machining Mild Steel IS 2026 using copper electrode. Based on the experiments conducted on L9 orthogonal array, analysis has been carried out using Grey Relational Analysis, a Taguchi method. Response tables and graphs were used to find the optimal levels of parameters in EDM process. The confirmation experiments were carried out to validate the optimal results. Thus, the machining parameters for EDM were optimized for achieving the combined objectives of higher rate of material removal, lower wear rate on tool, and lower surface roughness value on the work material considered in this work. The obtained results show that the Taguchi Grey relational Analysis is being effective technique to optimize the machining parameters for EDM process.

RAGHURAMAN S, THIRUPPATHI K, PANNEERSELVAM T, SANTOSH S

2013-01-01

152

Searching for electronic journal articles to support academic tasks. A case study of the use of the Finnish National Electronic Library (FinELib)  

Directory of Open Access Journals (Sweden)

Full Text Available Introduction. We analyse how academic status and discipline influence the major search methods used by university academic staff for obtaining electronic articles for teaching, research and keeping up to date in their field. Method. The data consist of a nationwide Web-survey of the end-users of FinELib, The Finnish National Electronic Library. The number of respondents was 900. Analysis. Cross tabulations and multivariate analyses were used for answering research questions. Results. Keyword searching in journal and reference databases were clearly the most important access methods in all disciplines compared to browsing, chaining or obtaining material from colleagues. Academic status and discipline influenced the patterning of search methods used. Keyword searching in databases was more common in natural sciences, engineering and medicine than in other disciplines. Semi-directed searching comprised of browsing, chaining and colleagues as sources of access. It was significantly more common in humanities than in other disciplines. Conclusion. Patterns of searching for journal articles are changing because of the provision of digital information resources. In particular, the role of colleagues is diminishing.

Pertti Vakkari; Sana Talja

2006-01-01

153

Diseño y prueba de un sistema de control de espaciamiento y potencia para Micro-EDM  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Una vertiente en la evolución de los procesos de manufactura contempla reducir el tamaño de la máquina herramienta de manera proporcional al tamaño de la pieza de trabajo. Las nuevas propuestas para los procesos de micro-manufactura, como micro-EDM (micro-Electrical Discharge Machining), requieren de parámetros de proceso hasta ahora poco explorados para realizar tareas que demandan alta precisión y productividad. En este trabajo se presenta el desarrollo de un sist (more) ema de control de espaciamiento (gap) y de suministro de potencia para realizar procesos de manufactura mediante micro-EDM. Con el objetivo de explorar los valores de los parámetros de manufactura que permitieran mayor remoción de material se utilizó el diseño de experimentos Taguchi. La configuración experimental utiliza un sistema de control acoplado a un circuito RC para controlar el espaciamiento entre el electrodo y la pieza de trabajo, además de un electrodo de cobre de 0.7mm de diámetro. Abstract in english A trend in the evolution of manufacturing processes shows a tendency towards the reduction of the size of the machine tool in a manner proportional to the size of part. Emerging technologies such as micro EDM require process parameters that have been seldom explored in the literature, to perform tasks that require high precision and productivity. This article presents the development of a circuit for power supply and gap control for micro EDM. To test the circuit, the sel (more) ection of process parameters that maximize removal rates was explored using a Taguchi experimental design. The experimental confi guration of the micro EDM process used 0.7 mm copper electrodes, controlled by a micro-controller based RC circuit.

Oscar, Chaides; Ahuett, Horacio; Flores, Abiud; Caballero, Alberto; Ruiz, Leopoldo

2009-03-01

154

Search for the most stable Ca@C44 isomer: structural stability and electronic property investigations.  

UK PubMed Central (United Kingdom)

Stimulated by the mass spectroscopic observation of the metallofullerene Ca@C(44), we have performed a systematic investigation to search for the most stable isomer using HF/3-21G approximately LanL2DZ, HF/6-31+G(d), B3LYP/6-31+G(d), and MP2/6-31+G(d)//B3LYP/6-31+G(d) methods. The Ca@C(44) (D(2):53) isomer with eight adjacent pentagons in the fullerene framework is predicted to possess the lowest energy. The thermodynamics stability explorations of Ca@C(44) isomers at different temperatures show that Ca@C(44) (D(2):53) is the most thermodynamically stable in the temperature range of absolute zero to 4000 K. The encapsulation of Ca atom in C(44) fullerene is exothermic, and the electronic structure of Ca@C(44) (D(2):53) can be described formally as Ca(2+)@C(44) (2-). Further analysis on the frontier molecular orbitals and density of states of Ca@C(44) (D(2):53) suggests that both highest occupied molecular orbital and lowest unoccupied molecular orbital are carbonlike with low Ca character, and the carbon cage possesses high chemical activity. In addition, the vibrational spectrum of Ca@C(44) (D(2):53) has been simulated and analyzed to gain an insight into the metal-cage vibrations.

Tang SW; Sun LL; Sun H; Feng JD; Wang RS; Chang YF; Hao LZ

2009-03-01

155

Search for the most stable Ca@C44 isomer: Structural stability and electronic property investigations  

Science.gov (United States)

Stimulated by the mass spectroscopic observation of the metallofullerene Ca@C44, we have performed a systematic investigation to search for the most stable isomer using HF/3-21G~LanL2DZ, HF/6-31+G(d), B3LYP/6-31+G(d), and MP2/6-31+G(d)//B3LYP/6-31+G(d) methods. The Ca@C44 (D2:53) isomer with eight adjacent pentagons in the fullerene framework is predicted to possess the lowest energy. The thermodynamics stability explorations of Ca@C44 isomers at different temperatures show that Ca@C44 (D2:53) is the most thermodynamically stable in the temperature range of absolute zero to 4000 K. The encapsulation of Ca atom in C44 fullerene is exothermic, and the electronic structure of Ca@C44 (D2:53) can be described formally as Ca2+@C442-. Further analysis on the frontier molecular orbitals and density of states of Ca@C44 (D2:53) suggests that both highest occupied molecular orbital and lowest unoccupied molecular orbital are carbonlike with low Ca character, and the carbon cage possesses high chemical activity. In addition, the vibrational spectrum of Ca@C44 (D2:53) has been simulated and analyzed to gain an insight into the metal-cage vibrations.

Tang, Shu-Wei; Sun, Li-Li; Sun, Hao; Feng, Jing-Dong; Wang, Rong-Shun; Chang, Ying-Fei; Hao, Li-Zhu

2009-03-01

156

Electronic Serials Usage Patterns as Observed at a Medium-Size University: Searches and Full-Text Downloads.  

Directory of Open Access Journals (Sweden)

Full Text Available As the number of electronic serials available to libraries continues to increase while library budgets remain either stagnant or on the decrease, it becomes necessary to evaluate the use of a library’s electronic collection. In 2006, usage statistics were evaluated at Laurentian University, Canada, to provide direction to collection development and identify high-cost low-use electronic serials. Searches and full-text downloads were studied. A sharp increase in use was observed in and around 2004 which can be explained by the introduction, in Ontario, of the ‘double cohort’, by the rapid increase in the number of electronic resources subscribed to at Laurentian, and by the adoption of OpenURL technology. Heavily used electronic serials are identified. Turnaways, connections by IP address and Bradford’s 20:80 rule are also examined. The application of a cost-per-download ratio provided a practical method for identifying underused products.

Alain Raymond Lamothe

2008-01-01

157

T700 Turbine Nozzle Manufacturing Technology Program. Computer Assisted EDM. Cooling Flow Measurement by IR. Automated Optical Area Measurement.  

Science.gov (United States)

This program consisted of three separate tasks relative to the improvement of T700 turbine nozzle manufacturing process. (1) Computer Assisted EDM - This report documents a series of four experiments performed at the Manufacturing Technology Laboratory in...

G. R. Dearth T. Bantel D. Mack V. Bolduc

1981-01-01

158

Analysis of Medium-Term Economic Development and Energy Consumptions through the EURECA-EXPLOR-EDM Model Chain.  

Science.gov (United States)

In this report the macroeconomic and sectorial results obtained through a series of Explor-EDM runs are described; their achievement also required the introduction of some innovations in the data banks. Throughout this work some exogenous variables in the...

N. Merzagora

1983-01-01

159

Search for long-lived particles decaying into electron or photon pairs with the D0 detector  

CERN Multimedia

In this Letter we report on a search for long-lived particles that decay into final states with two electrons or photons. Such long-lived particles arise in a variety of theoretical models, like hidden valleys and supersymmetry with gauge-mediated breaking. By precisely reconstructing the direction of the electromagnetic shower we are able to probe much longer lifetimes than previously explored. We see no evidence of the existence of such long-lived particles and interpret this search as a quasi model-independent limit on their production cross section, as well as a limit on a long-lived fourth generation quark.

Abazov, V M; Abolins, M; Acharya, B S; Adams, M; Adams, T; Aguiló, E; Ahsan, M; Alexeev, G D; Alkhazov, G; Alton, A; Alverson, G; Alves, G A; Anastasoaie, M; Ancu, L S; Andeen, T; Anderson, S; Andrieu, B; Anzelc, M S; Aoki, M; Arnoud, Y; Arov, M; Arthaud, M; Askew, A; sman, B; Assis-Jesus, A C S; Atramentov, O; Avila, C; Badaud, F; Bagby, AL; Baldin, B; Bandurin, D V; Banerjee, P; Banerjee, S; Barberis, E; Barfuss, A F; Bargassa, P; Baringer, P; Barreto, J; Bartlett, J F; Bassler, U; Bauer, D; Beale, S; Bean, A; Begalli, M; Begel, M; Belanger-Champagne, C; Bellantoni, L; Bellavance, A; Benítez, J A; Beri, S B; Bernardi, G; Bernhard, R; Bertram, I; Besançon, M; Beuselinck, R; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Biscarat, C; Blazey, G; Blekman, F; Blessing, S; Bloch, D; Bloom, K; Böhnlein, A; Boline, D; Bolton, T A; Boos, E E; Borissov, G; Bose, T; Brandt, A; Brock, R; Brooijmans, G; Bross, A; Brown, D; Bu, X B; Buchanan, N J; Buchholz, D; Bühler, M; Büscher, V; Bunichev, V; Burdin, S; Burnett, T H; Buszello, C P; Butler, J M; Calfayan, P; Calvet, S; Cammin, J; Carvalho, W; Casey, B C K; Castilla-Valdez, H; Chakrabarti, S; Chakraborty, D; Chan, K; Chan, K M; Chandra, A; Charles, F; Cheu, E; Chevallier, F; Cho, D K; Choi, S; Choudhary, B; Christofek, L; Christoudias, T; Cihangir, S; Claes, D; Clutter, J; Cooke, M; Cooper, W E; Corcoran, M; Couderc, F; Cousinou, M C; Crepe-Renaudin, S; Cuplov, V; Cutts, D; Cwiok, M; Da Motta, H; Das, A; Davies, G; De, K; De Jong, S J; De La Cruz-Burelo, E; De Oliveira Martins, C; Degenhardt, J D; Dliot, F; Demarteau, M; Demina, R; Denisov, D; Denisov, S P; Desai, S; Diehl, H T; Diesburg, M; Dominguez, A; Dong, H; Dudko, L V; Duflot, L; Dugad, S R; Duggan, D; Duperrin, A; Dyer, J; Dyshkant, A; Eads, M; Edmunds, D; Ellison, J; Elvira, V D; Enari, Y; Eno, S; Ermolov, P; Evans, H; Evdokimov, A; Evdokimov, V N; Ferapontov, A V; Ferbel, T; Fiedler, F; Filthaut, F; Fisher, W; Fisk, H E; Fortner, M; Fox, H; Fu, S; Fuess, S; Gadfort, T; Galea, C F; Gallas, E; García, C; García-Bellido, A; Gavrilov, V; Gay, P; Geist, W; Gel, D; Gerber, C E; Gershtein, Yu; Gillberg, D; Ginther, G; Gollub, N; Gmez, B; Goussiou, A; Grannis, P D; Greenlee, H; Greenwood, Z D; Gregores, E M; Grenier, G; Gris, P; Grivaz, J F; Grohsjean, A; Grünendahl, S; Grünewald, M W; Guo, F; Guo, J; Gutíerrez, G; Gutíerrez, P; Haas, A; Hadley, N J; Haefner, P; Hagopian, S; Haley, J; Hall, I; Hall, R E; Han, L; Harder, K; Harel, A; Hauptman, J M; Hauser, R; Hays, J; Hebbeker, T; Hedin, D; Hegeman, J G; Heinson, A P; Heintz, U; Hensel, C; Herner, K; Hesketh, G; Hildreth, M D; Hirosky, R; Hobbs, J D; Hoeneisen, B; Hoeth, H; Hohlfeld, M; Hossain, S; Houben, P; Hu, Y; Hubacek, Z; Hynek, V; Iashvili, I; Illingworth, R; Ito, A S; Jabeen, S; Jaffré, M; Jain, S; Jakobs, K; Jarvis, C; Jesik, R; Johns, K; Johnson, C; Johnson, M; Jonckheere, A; Jonsson, P; Juste, A; Kajfasz, E; Kalk, J M; Karmanov, D; Kasper, P A; Katsanos, I; Kau, D; Kaushik, V; Kehoe, R; Kermiche, S; Khalatyan, N; Khanov, A; Kharchilava, A; Kharzheev, Yu M; Khatidze, D; Kim, T J; Kirby, M H; Kirsch, M; Klima, B; Kohli, J M; Konrath, J P; Kozelov, A V; Kraus, J; Kühl, T; Kumar, A; Kupco, A; Kura, T; Kuzmin, V A; Kvita, J; Lacroix, F; Lam, D; Lammers, S; Landsberg, G; Lebrun, P; Lee, W M; Leflat, A; Lellouch, J; Li, J; Li, L; Li, Q Z; Lietti, S M; Lima, J G R; Lincoln, D; Linnemann, J; Lipaev, V V; Lipton, R; Liu, Y; Liu, Z; Lobodenko, A; Lokajícek, M; Love, P; Lubatti, H J; Luna, R; Lyon, A L; Maciel, A K A; Mackin, D; Madaras, R J; Mättig, P; Magass, C; Magerkurth, A; Mal, P K; Malbouisson, H B; Malik, S; Malyshev, V L; Mao, H S; Maravin, Y; Martin, B; McCarthy, R; Melnitchouk, A; Mendoza, L; Mercadante, P G; Merkin, M; Merritt, K W; Meyer, A; Meyer, J; Millet, T; Mitrevski, J; Mommsen, R K; Mondal, N K; Moore, R W; Moulik, T; Muanza, G S; Mulhearn, M; Mundal, O; Mundim, L; Nagy, E; Naimuddin, M; Narain, M; Naumann, N A; Neal, H A; Negret, J P; Neustroev, P; Nilsen, H; Nogima, H; Novaes, S F; Nunnemann, T; O'Dell, V; O'Neil, D C; Obrant, G; Ochando, C; Onoprienko, D; Oshima, N; Osman, N; Osta, J; Otec, R; Oteroy-Garzon, G J; Owen, M; Padley, P; Pangilinan, M; Parashar, N; Park, S J; Park, S K; Parsons, J; Partridge, R; Parua, N; Patwa, A; Pawloski, G; Penning, B; Perfilov, M; Peters, K; Peters, Y; Pétroff, P; Petteni, M; Piegaia, R; Piper, J; Pleier, M A; Podesta-Lerma, P L M; Podstavkov, V M; Pogorelov, Y; Pol, M E; Polozov, P; Pope, B G; Popov, A V; Potter, C; Prado da Silva, W L; Prosper, H B; Protopopescu, S; Qian, J; Quadt, A; Quinn, B; Rakitine, A; Rangel, M S; Ranjan, K; Ratoff, P N; Renkel, P; Reucroft, S; Rich, P; Rieger, J; Rijssenbeek, M; Ripp-Baudot, I; Rizatdinova, F; Robinson, S; Rodrigues, R F; Rominsky, M; Royon, C; Rubinov, P; Ruchti, R; Safronov, G; Sajot, G; Sánchez-Hernández, A; Sanders, M P; Sanghi, B; Savage, G; Sawyer, L

2008-01-01

160

Search for magnetic monopoles in electron-positron collisions at 34 GeV c.m. energy  

International Nuclear Information System (INIS)

A search for heavily ionizing particles was carried out at the electron-positron storage ring PETRA with the help of Kapton detectors placed inside the vacuum pipe. The total integrated luminosity was 90 pb-1 at c.m. energies above 34GeV. The search was sensitive to particles with magnetic charge from 1 (137/2)e to 5 (137/2)e and with masses up to 10-16 GeV/c2. No such particle was found. leading to an upper limit of the production cross section of monopole-antimonopole pairs of 4 x 10-38cm2 (95% c.l.). (orig.)

1983-01-01

 
 
 
 
161

Search for Long-Lived Particles Decaying into Electron or Photon Pairs with the D0 Detector  

International Nuclear Information System (INIS)

In this Letter we report on a search for long-lived particles that decay into final states with two electrons or photons. Such long-lived particles arise in a variety of theoretical models, such as hidden valleys and supersymmetry with gauge-mediated breaking. By precisely reconstructing the direction of the electromagnetic shower we are able to probe much longer lifetimes than previously explored. We see no evidence of the existence of such long-lived particles and interpret this search as a quasi model-independent limit on their production cross section, as well as a limit on a long-lived fourth generation quark.

2008-09-12

162

Light Gauginos - a Solution to More than the EDMs?  

CERN Multimedia

In this talk I want to present questions that remained unclear to me in the last years. These questions concern the Electric Dipole Moments of electron and neutron and the way people exclude regions of parameter space.

Gajdosik, T

2001-01-01

163

Post-cast EDM method for reducing the thickness of a turbine nozzle wall  

Energy Technology Data Exchange (ETDEWEB)

A post-cast EDM process is used to remove material from the interior surface of a nozzle vane cavity of a turbine. A thin electrode is passed through the cavity between opposite ends of the nozzle vane and displaced along the interior nozzle wall to remove the material along a predetermined path, thus reducing the thickness of the wall between the cavity and the external surface of the nozzle. In another form, an EDM process employing a profile as an electrode is disposed in the cavity and advanced against the wall to remove material from the wall until the final wall thickness is achieved, with the interior wall surface being complementary to the profile surface.

Jones, Raymond Joseph (Duanesburg, NY); Bojappa, Parvangada Ganapathy (Schenectady, NY); Kirkpatrick, Francis Lawrence (Galway, NY); Schotsch, Margaret Jones (Clifton Park, NY); Rajan, Rajiv (Guilderland, NY); Wei, Bin (Mechanicville, NY)

2002-01-01

164

On-line collection and transfer of radioactive noble gas isotopes for radon EDM measurements  

Science.gov (United States)

An apparatus has been developed for on--line collection and transfer to a measurement cell of radon isotopes for optical pumping studies and electric dipole moment (EDM) measurements. Specific isotopes are predicted to have large atomic EDMs due to nuclear octupole deformation or vibration resulting in enhanced sensitivity to CP violation. A low energy isotope separator beam is stopped in a foil. After collection, the foil is heated and the noble gas atoms are cryopumped to a cold finger and then transferred with a buffer gas to a measurement cell. The apparatus has been tested with ^120Xe produced from a ^120Cs beam at the TRIUMF ISAC facility, and greater than 40% efficiency for transfer from the foil to the cell has been demonstrated. The apparatus may also be useful for other measurements with gaseous targets including laser spectroscopy and precision half--life measurements.

Nuss-Warren, Sarah; Tardiff, Eric; Warner, Tim; Ball, Gordon; Behr, John; Chupp, Tim; Coulter, Kevin; Hackman, Greg; Hayden, Michael; Pearson, Matthew; Phillips, Andrew; Smith, Martin; Svensson, Carl

2004-05-01

165

Aspects on the optimization of die-sinking EDM of tungsten carbide-cobalt  

Scientific Electronic Library Online (English)

Full Text Available Abstract in english At present, due to their properties, the tungsten carbide-cobalt (WC-Co) composite materials are in huge demand by industry to manufacture special tools, dies/molds and components under erosion. The powder metallurgy is the usual process applied to obtain WC-Co products, but in some cases this process is unable to produce tools of very complex shapes and highly intricate details. Thus, additional conventional and non-conventional machining processes are required. In this (more) context, the electrical discharge machining (EDM) is an efficient alternative process. However, the EDM parameters have to be properly set for any different tungsten carbide-cobalt composition and electrode material to achieve an appropriate level of machining performance. In this work, a special grade of tungsten carbide-cobalt was used as workpiece and a copper-tungsten alloy as electrode. Experiments on important EDM electrical and non-electrical parameter settings with reference to material removal rate, electrode wear ratio and surface roughness were carried out under typical rough and finish machining. This paper contributes with an attempt to provide insightful guidelines to optimize electrical discharge machining of WC-Co composite materials using CuW alloy electrodes.

Amorim, Fred Lacerda; Weingaertner, Walter Lindolfo; Bassani, Irionson Antonio

2010-12-01

166

Aspects on the optimization of die-sinking EDM of tungsten carbide-cobalt  

Directory of Open Access Journals (Sweden)

Full Text Available At present, due to their properties, the tungsten carbide-cobalt (WC-Co) composite materials are in huge demand by industry to manufacture special tools, dies/molds and components under erosion. The powder metallurgy is the usual process applied to obtain WC-Co products, but in some cases this process is unable to produce tools of very complex shapes and highly intricate details. Thus, additional conventional and non-conventional machining processes are required. In this context, the electrical discharge machining (EDM) is an efficient alternative process. However, the EDM parameters have to be properly set for any different tungsten carbide-cobalt composition and electrode material to achieve an appropriate level of machining performance. In this work, a special grade of tungsten carbide-cobalt was used as workpiece and a copper-tungsten alloy as electrode. Experiments on important EDM electrical and non-electrical parameter settings with reference to material removal rate, electrode wear ratio and surface roughness were carried out under typical rough and finish machining. This paper contributes with an attempt to provide insightful guidelines to optimize electrical discharge machining of WC-Co composite materials using CuW alloy electrodes.

Fred Lacerda Amorim; Walter Lindolfo Weingaertner; Irionson Antonio Bassani

2010-01-01

167

Search for scalar and vector leptoquarks in electron-proton collisions at ?S = 300 GeV  

International Nuclear Information System (INIS)

A search for a resonant state coupled to an electron-quark pair has been performed using collisions of the electron beam of 26.7 GeV and the proton beam of 820 GeV. With the integrated luminosity of 26.6 ± 1.6 nb-1, scalar and vector leptoquarks have been searched for in the neutral current and charged current samples. The selected events agreed well with the prediction of the Standard Model, and no evidence has been found for production of leptoquarks decaying into e- + jet or ? + jet. Limits on the coupling strength of scalar (vector) leptoquarks to electron and quark have been determined for masses from 50 (40) GeV to 225 GeV. A limit on the leptoquark mass has been also obtained at the 95% confidence level assuming that either left-handed or right-handed coupling exists to the electron-quark pair with electroweak strength. The mass limit depends on the cross section determined by the choice of quantum numbers. Leptoquarks are ruled out for masses below 216 GeV with the largest cross section and below 105 GeV with the smallest cross section. (author) 102 refs

1993-01-01

168

Search for excited electrons in ppbar collisions at $\\sqrt{s}$ = 1.96 TeV  

CERN Document Server

We present the results of a search for the production of an excited state of the electron, e*, in proton-antiproton collisions at $\\sqrt{s}$ = 1.96 TeV. The data were collected with the D0 experiment at the Fermilab Tevatron Collider and correspond to an integrated luminosity of approximately 1 fb^-1. We search for e* in the process ppbar -> e* e, with the e* subsequently decaying to an electron plus photon. No excess above the standard model background is observed. Interpreting our data in the context of a model that describes e* production by four-fermion contact interactions and e* decay via electroweak processes, we set 95% C.L. upper limits on the production cross section ranging from 8.9 fb to 27 fb, depending on the mass of the excited electron. Choosing the scale for contact interactions to be Lambda = 1 TeV, excited electron masses below 756 GeV are excluded at the 95% C.L.

Abazov, V; Abolins, M; Acharya, B S; Adams, M; Adams, T; Aguiló, E; Ahn, S H; Ahsan, M; Alexeev, G D; Alkhazov, G; Alton, A; Alverson, G; Alves, G A; Anastasoaie, M; Ancu, L S; Andeen, T; Anderson, S; Andrieu, B; Anzelc, M S; Arnoud, Y; Arov, M; Arthaud, M; Askew, A; sman, B; Assis-Jesus, A C S; Atramentov, O; Autermann, C; Avila, C; Ay, C; Badaud, F; Baden, A A; Bagby, L; Baldin, B; Bandurin, D V; Banerjee, S; Banerjee, P; Barberis, E; Barfuss, A F; Bargassa, P; Baringer, P; Barreto, J; Bartlett, J F; Bassler, U; Bauer, D; Beale, S; Bean, A; Begalli, M; Begel, M; Belanger-Champagne, C; Bellantoni, L; Bellavance, A; Benítez, J A; Beri, S B; Bernardi, G; Bernhard, R; Bertram, I; Besançon, M; Beuselinck, R; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Biscarat, C; Blazey, G; Blekman, F; Blessing, S; Bloch, D; Bloom, K; Böhnlein, A; Boline, D; Bolton, T A; Borissov, G; Bose, T; Brandt, A; Brock, R; Brooijmans, G; Bross, A; Brown, D; Buchanan, N J; Buchholz, D; Bühler, M; Büscher, V; Bunichev, V; Burdin, S; Burke, S; Burnett, T H; Buszello, C P; Butler, J M; Calfayan, P; Calvet, S; Cammin, J; Carvalho, W; Casey, B C K; Cason, N M; Castilla-Valdez, H; Chakrabarti, S; Chakraborty, D; Chan, K M; Chan, K; Chandra, A; Charles, F; Cheu, E; Chevallier, F; Cho, D K; Choi, S; Choudhary, B; Christofek, L; Christoudias, T; Cihangir, S; Claes, D; Coadou, Y; Cooke, M; Cooper, W E; Corcoran, M; Couderc, F; Cousinou, M C; Crepe-Renaudin, S; Cutts, D; Cwiok, M; Da Motta, H; Das, A; Davies, eeG; De, K; De Jong, S J; De La Cruz-Burelo, E; De Oliveira Martins, C; Degenhardt, J D; Dliot, F; Demarteau, M; Demina, R; Denisov, D; Denisov, S P; Desai, S; Diehl, H T; Diesburg, M; Dominguez, e A; Dong, H; Dudko, L V; Duflot, L; Dugad, S R; Duggan, D; Duperrin, A; Dyer, J; Dyshkant, A; Eads, M; Edmunds, D; Ellison, J; Elvira, V D; Enari, Y; Eno, S; Ermolov, P; Evans, H; Evdokimov, A; Evdokimov, V N; Ferapontov, A V; Ferbel, T; Fiedler, F; Filthaut, F; Fisher, W; Fisk, H E; Ford, M; Fortner, M; Fox, H; Fu, S; Fuess, S; Gadfort, T; Galea, C F; Gallas, E; Galyaev, E; García, C; García-Bellido, A; Gavrilov, V; Gay, P; Geist, W; Gel, D; Gerber, eC E; Gershtein, Yu; Gillberg, D; Ginther, G; Gollub, N; Gmez, B; Goussiou, A; Grannis, P D; Greenlee, o H; Greenwood, Z D; Gregores, E M; Grenier, G; Gris, P; Grivaz, J F; Grohsjean, A; Grünendahl, S; Grünewald, M W; Guo, J; Guo, F; Gutíerrez, P; Gutíerrez, G; Haas, A; Hadley, N J; Haefner, P; Hagopian, S; Haley, J; Hall, I; Hall, R E; Han, L; Hansson, P; Harder, K; Harel, A; Harrington, R; Hauptman, J M; Hauser, R; Hays, J; Hebbeker, T; Hedin, D; Hegeman, J G; Heinmiller, J M; Heinson, A P; Heintz, U; Hensel, C; Herner, K; Hesketh, G; Hildreth, M D; Hirosky, R; Hobbs, J D; Hoeneisen, B; Hoeth, H; Hohlfeld, M; Hong, S J; Hossain, S; Houben, P; Hu, Y; Hubacek, Z; Hynek, V; Iashvili, I; Illingworth, R; Ito, A S; Jabeen, S; Jaffré, M; Jain, S; Jakobs, e K; Jarvis, C; Jesik, R; Johns, K; Johnson, C; Johnson, M; Jonckheere, A; Jonsson, P; Juste, A; Kajfasz, E; Kalinin, A M; Kalk, J R; Kalk, J M; Kappler, S; Karmanov, D; Kasper, P A; Katsanos, I; Kau, D; Kaur, R; Kaushik, V; Kehoe, R; Kermiche, S; Khalatyan, N; Khanov, A; Kharchilava, A; Kharzheev, Yu M; Khatidze, D; Kim, T J; Kirby, M H; Kirsch, M; Klima, B; Kohli, J M; Konrath, J P; Korablev, V M; Kozelov, A V; Krop, D; Kühl, T; Kumar, A; Kunori, S; Kupco, A; Kura, T; Kvita, J; Lacroix, F; Lam, D; Lammers, S; Landsberg, G; Lebrun, P; Lee, cW M; Leflat, A; Lehner, F; Lellouch, J; Lévêque, J; Li, J; Li, Q Z; Li, L; Lietti, S M; Lima, J G R; Lincoln, D; Linnemann, J; Lipaev, V V; Lipton, R; Liu, Y; Liu, Z; Lobodenko, A; Lokajícek, M; Love, P; Lubatti, H J; Luna, R; Lyon, A L; Maciel, A K A; Mackin, D; Madaras, R J; Mättig, P; Magass, C; Magerkurth, A; Mal, P K; Malbouisson, H B; Malik, S; Malyshev, V L; Mao, H S; Maravin, Y; Martin, B; McCarthy, R; Melnitchouk, A; Mendoza, L; Mercadante, P G; Merkin, M; Merritt, K W; Meyer, J; Meyer, A; Millet, T; Mitrevski, J; Molina, J; Mommsen, R K; Mondal, N K; Moore, R W; Moulik, T; Muanza, G S; Mulders, M; Mulhearn, M; Mundal, O; Mundim, L; Nagy, E; Naimuddin, M; Narain, M; Naumann, N A; Neal, H A; Negret, J P; Neustroev, P; Nilsen, H; Nogima, H; Novaes, S F; Nunnemann, T; O'Dell, V; O'Neil, D C; Obrant, G; Ochando, C; Onoprienko, D; Oshima, N; Osta, J; Otec, R; Oteroy-Garzon, G J; Owen, M; Padley, P; Pangilinan, M; Parashar, N; Park, S J; Park, S K; Parsons, J; Partridge, R; Parua, N; Patwa, A; Pawloski, G; Penning, B; Perfilov, M; Peters, K; Peters, Y; Ptroff, P; Petteni, M; Piegaia, cR; Piper, J; Pleier, M A; Podesta-Lerma, P L M; Podstavkov, V M; Pogorelov, Y; Pol, M E; Polozov, P; Pope, B G; Popov, A V; Potter, C; Prado da Silva, W L; Prosper, H B; Protopopescu, S; Qian, J; Quadt, A; Quinn, B; Rakitine, A; Rangel, M S; Ranjan, K; Ratoff, P N; Renkel, P; Reucroft, S; Rich, P; Rieger, J; Rijssenbeek, M

2008-01-01

169

A search for strong-field direct two electron ionization using coincidence spectroscopy  

International Nuclear Information System (INIS)

We report on our program in detecting two-electron ionization using electron-electron and electron-ion coincidence measurements. The coincidence techniques have been applied to the multiphoton ionization (MPI) of xenon atoms with 0.527 ?m excitation. The results show that direct two electron ionization is not occurring which is in variance with an earlier report. We also present a polarization study on the MPI of helium at 0.62 ?m and discuss these results in context of existing models

1993-01-01

170

A search for strong-field direct two electron ionization using coincidence spectroscopy  

Energy Technology Data Exchange (ETDEWEB)

We report on our program in detecting two-electron ionization using electron-electron and electron-ion coincidence measurements. The coincidence techniques have been applied to the multiphoton ionization (MPI) of xenon atoms with 0.527 [mu]m excitation. The results show that direct two electron ionization is not occurring which is in variance with an earlier report. We also present a polarization study on the MPI of helium at 0.62 [mu]m and discuss these results in context of existing models.

Agostini, P.; Mevel, E.; Breger, P. (CEA Centre d' Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Service de Recherches sur les Surfaces et de l' Irradiation de la Matiere); Walker, B.; Yang, B.; DiMauro, L.F. (Brookhaven National Lab., Upton, NY (United States))

1993-01-01

171

A search for strong-field direct two electron ionization using coincidence spectroscopy  

Energy Technology Data Exchange (ETDEWEB)

We report on our program in detecting two-electron ionization using electron-electron and electron-ion coincidence measurements. The coincidence techniques have been applied to the multiphoton ionization (MPI) of xenon atoms with 0.527 {mu}m excitation. The results show that direct two electron ionization is not occurring which is in variance with an earlier report. We also present a polarization study on the MPI of helium at 0.62 {mu}m and discuss these results in context of existing models.

Agostini, P.; Mevel, E.; Breger, P. [CEA Centre d`Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Service de Recherches sur les Surfaces et de l`Irradiation de la Matiere; Walker, B.; Yang, B.; DiMauro, L.F. [Brookhaven National Lab., Upton, NY (United States)

1993-05-01

172

Search for excited and exotic electrons i the e? decay channel in ppbar collisions at ? s = 1.96 Tev  

International Nuclear Information System (INIS)

[en] We present a search for excited and exotic electrons (e*) decaying to an electron and a photon, both with high transverse momentum. We use 202 pb-1 of data collected in p(bar p) collisions at ?s = 1.96 TeV with the CDF II detector. No signal above standard model expectation is seen for associated ee* production. We discuss the e* sensitivity in the parameter space of the excited electron mass Me* and the compositeness energy scale ?. In the contact interaction model, we exclude 132 GeV/c2 e* 2 for ? = Me* at 95% confidence level (C.L.). In the gauge-mediated model, we exclude 126 GeV/c2 e* 2 at 95% C.L. for the phenomenological coupling f/? ? 10-2 GeV-1

2005-02-21

173

Electronic Serials Usage Patterns as Observed at a Medium-Size University: Searches and Full-Text Downloads  

Directory of Open Access Journals (Sweden)

Full Text Available while library budgets remain either stagnant or on the decrease, it becomesnecessary to evaluate the use of a library's electronic collection. In 2006, usagestatistics were evaluated at Laurentian University, Canada, to provide direction tocollection development and identify high-cost low-use electronic serials.Searches and full-text downloads were studied. A sharp increase in use wasobserved in and around 2004 which can be explained by the introduction, inOntario, of the 'double cohort', by the rapid increase in the number of electronicresources subscribed to at Laurentian, and by the adoption of OpenURLtechnology. Heavily used electronic serials are identified. Turnaways,connections by IP address and Bradford's 20:80 rule are also examined. Theapplication of a cost-per-download ratio provided a practical method foridentifying underused products.

Alain Lamothe

2008-01-01

174

Search for resonant electron transfer and double excitation in Kr(sup 34+) + H2 collisions  

Science.gov (United States)

Resonant electron transfer and double excitation (RME) is a correlated electron process which is expected to occur in an ion-atom collision when electron capture is accompanied by the simultaneous excitation of two inner-shell electrons. RT2 is similar to resonant transfer excitation (RTE) in which only a single electron is excited. RT2E was investigated experimentally for 38-42 MeV/u Kr34 + H2 collisions by observing x-ray emission associated with single-electron capture. No events associated with Kr K x rays (near 13 keV) were observed; however, events do occur at about twice (greater than 22 keV) the Kr K x-ray energy. Several possible sources of these latter x rays have been considered.

Zaharakis, K. E.; Haar, R. R.; Tanis, J. A.; Clark, M. W.; Plano, V. L.

175

The generalized simulated annealing algorithm in the low energy electron diffraction search problem  

International Nuclear Information System (INIS)

We present in this work results concerning the application of the generalized simulated annealing (GSA) algorithm to the LEED search problem. The influence of the visiting distribution function (defined by the so-called qV parameter) in the effectiveness of the method was investigated by the application of the algorithm to structural searches for optimization of two to ten parameters in a theory-theory comparison for the CdTe(110) system. Results, obtained with the scaling relation and probability of convergence as a function of the number of parameters to be varied, indicate the fast simulated annealing (FSA) (qV = 2.0) approach as the best search machine.

2005-01-12

176

Avaliação da Geração de Microtrincas do Aço Rápido ABNT M2 no Processo EDM com Adição de SiC - DOI: 10.4025/actascitechnol.v30i2.543 Evaluation of the Microcrack Generation of ABNT M2 High Speed Steel in EDM Process With Addition of Silicon Carbide Powder - DOI: 10.4025/actascitechnol.v30i2.543  

Directory of Open Access Journals (Sweden)

Full Text Available É sabido que a Usinagem por Descargas Elétricas (EDM), é um processo térmico onde pode-se ter temperaturas muito elevadas (superiores a 1200 °C) na região de usinagem. Conseqüentemente é fácil de entender o fato das peças usinadas por EDM, apresentarem camadas superficiais endurecidas, refundidas e com elevado números de microtrincas superfíciais. A formação de microtrincas está associada com o desenvolvimento de altas tensões térmicas que excedem a tensão máxima de resistência do material. Além disso as microtrincas superficiais penetram em profundidade com extensões que dependem da energia de descarga. O trabalho proposto, tem por objetivo estudar o efeito da adição de pó de SiC em vários fluidos dielétricos, sobre a geração de microtrincas superficiais, no aço rápido ABNT M2, durante a usinagem por descargas elétricas. Os resultados apresentados mostram uma redução da quantidade de microtrincas nas superfícies usinadas, quando se adiciona pó de SiC ao dielétrico, quando comparadas com as usinadas com EDM convencional.It is known that Electrical Discharge Machining (EDM), it is a thermal process where it can be had very high temperatures (higter than 1200° C) in the region of machining consequently is easy to understand that during each electric discharge, hight temperatures are generated, causing local fusion or even evaporation of the material machined. In each discharge, a crater is formed in the material and a small crater is formed in the electrode. Of every melted material produced in each discharge, only 15%, or minus, it is removed through the dielectric liquid. The remaining of the melted material solidifies forming a wrinkled surface. The characteristics of the surface obtained, overlap of craters, globules of sullage, “chimneys ", bubbles (formed when the gases arrested are liberated through the material resolidificado), they are revealed through an analysis by scanning electron microscope. O proposed work, has for objective to study the effect of the addition of powder of SiC in several dielectric fluids, on microcrack generation, in workpiece of the high speed steel (ABNT M2), during the electrical discharge machining. The presented results show that the samples machined with the addition of powders of SiC presented significant reduction of the number of microcrack in the surface machined, when compared with the machined with conventional EDM.

Jean Robert Pereira Rodrigues; Claudionor Cruz; Sinésio Domingues Franco; José Roberto Pereira Rodrigues; Wellinton de Assunção

2008-01-01

177

Pentaquark Searches in Electron-Positron Annihilations and Two-Photon Collisions at LEP  

Science.gov (United States)

Evidence for the production of exotic hadron states composed of five quarks (pentaquarks) has been searched for in data collected by the ALEPH, DELPHI, and L3 experiments at LEP. No significant signal is observed. Several 95% C.L. upper limits are set on the production rates of such particles.

Armstrong, S. R.

2005-05-01

178

Searching for TeV cosmic electrons with the CREST experiment  

Energy Technology Data Exchange (ETDEWEB)

The Cosmic Ray Electron Synchrotron Telescope (CREST) high-altitude balloon experiment is a pathfinding effort to detect for the first time multi-TeV cosmic-ray electrons. Such would be the markers of nearby cosmic accelerators, as energetic electrons from distant Galactic sources are expected to be depleted by radiative losses during interstellar transport. Electrons will be detected indirectly by the characteristic signature of their geomagnetic synchrotron losses, in the form of a burst of coaligned x-ray photons intersecting the plane of the instrument. Since the primary electron itself need not traverse the payload, an effective detection area is achieved that is several times the nominal 6.4 m{sup 2} instrument. The payload is composed of an array of 1024 BaF2 crystals surrounded by a set of veto scintillator detectors. A long-duration balloon flight in Antarctica is planned for the 2011-12 season.

Coutu, S., E-mail: coutu@phys.psu.edu [Department of Physics, Pennsylvania State University, 104 Davey Laboratory, University Park, PA 16802 (United States); Anderson, T. [Department of Physics, Pennsylvania State University, 104 Davey Laboratory, University Park, PA 16802 (United States); Bower, C. [Physics Department, Indiana University, 117 Swain Hall West, Bloomington, IN 47405 (United States); Gennaro, J. [Department of Physics, University of Michigan, Randall Physics Laboratory, 500 E. University Ave, Ann Arbor, MI 48109 (United States); Geske, M. [Department of Physics, Pennsylvania State University, 104 Davey Laboratory, University Park, PA 16802 (United States); Mueller, D. [Enrico Fermi Institute and Department of Physics, University of Chicago, 933 E. 56th St., Chicago, IL 60637 (United States); Musser, J. [Physics Department, Indiana University, 117 Swain Hall West, Bloomington, IN 47405 (United States); Nutter, S. [Department of Physics and Geology, Northern Kentucky University, Highland Heights, KY 41099 (United States); Park, N.H. [Enrico Fermi Institute and Department of Physics, University of Chicago, 933 E. 56th St., Chicago, IL 60637 (United States); Schubnell, M.; Tarle, G. [Department of Physics, University of Michigan, Randall Physics Laboratory, 500 E. University Ave, Ann Arbor, MI 48109 (United States); Wakely, S. [Enrico Fermi Institute and Department of Physics, University of Chicago, 933 E. 56th St., Chicago, IL 60637 (United States); Yagi, A. [Department of Physics, University of Michigan, Randall Physics Laboratory, 500 E. University Ave, Ann Arbor, MI 48109 (United States)

2011-06-15

179

A first search of excited states double beta and double electron capture decays of Pd110 and Pd102  

CERN Document Server

A search for double beta decays of the palladium isotopes Pd110 and Pd102 into excited states of their daughters was performed. New half-life limits for the 2nubb and 0nubb decays into first excited 0+ and 2+ states of 2.54e19 yr and 2.14e19 yr (95% CL) for the Pd110 decay were obtained improving limits by two orders of magnitude. The corresponding half-lives for double electron capture transition of Pd102 are 1.73e18 yr and 2.54e18 yr (95% CL) respectively. These are the first measurements for Pd102.

Lehnert, Bjoern

2011-01-01

180

New Concept for a Neutron Electric Dipole Moment Search using a Pulsed Beam  

CERN Document Server

A concept to search for a neutron electric dipole moment (nEDM) is presented, which employs a pulsed neutron beam instead of the nowadays established use of storable ultracold neutrons (UCN). The technique takes advantage of the high peak flux and the time structure of a next-generation pulsed spallation source like the planned European Spallation Source. It is demonstrated that the sensitivity for a nEDM can be improved by several orders of magnitude compared to the best beam experiments performed in the 1970's and can compete with the sensitivity of UCN experiments.

Piegsa, F M

2013-01-01

 
 
 
 
181

Modeling, simulation and parametric optimization of wire EDM process using response surface methodology coupled with grey-Taguchi technique  

Directory of Open Access Journals (Sweden)

Full Text Available In the present work, quadratic mathematical models have been derived to represent the process behavior of wire electrical discharge machining (WEDM) operation. Experiments have been conducted with six process parameters: discharge current, pulse duration, pulse frequency, wire speed, wire tension and dielectric flow rate; to be varied in three different levels. Data related to the process responses viz. material removal rate (MRR), roughness value of the worked surface (a measure of surface finish, SF) and kerf have been measured for each of the experimental runs; which correspond to randomly chosen different combinations of factor setting. These data have been utilized to fit a quadratic mathematical model (Response Surface Model) for each of the responses, which can be represented as a function of the aforesaid six process parameters. Predicted data have been utilized for identification of the parametric influence in the form of graphical representation for showing influence of the parameters on selected responses. Predicted data given by the models (as per Taguchi’s L27 (3*6) Orthogonal Array (OA) design) have been used in search of an optimal parametric combination to achieve desired yield of the process: maximum MRR, good surface finish (minimum roughness value) and dimensional accuracy of the product. Grey relational analysis has been adopted to convert this multi-objective criterion into an equivalent single objective function; overall grey relational grade, which has been optimized (maximized) by using Taguchi technique. Optimal setting has been verified through confirmatory test; showed good agreement to the predicted value. This indicates utility of the grey-Taguchi technique as multi-objective optimizer in the field of wire EDM.

Saurav Datta; Siba Sankar Mahapatra

2010-01-01

182

New approach to the Muon g-2 and EDM experiment at J-PARC  

International Nuclear Information System (INIS)

A new measurement of anomalous magnetic moment of the positive muon a? down to the level of 0.01 ppm and the electric dipole moment EDM with the improved sensitivity better than order of magnitude is proposed. Novel techniques utilizing an ultra-cold muon beam accelerated to 300 MeV/c and a 66 cm diameter of super-precisely controlled magnetic storage ring are introduced. An unique beam injection and storage scheme to control the beam trajectory into such a compact storage ring are also discussed.

2011-05-01

183

Examining the cancellation mechanism of neutron EDM in a model with dilaton-dominated SUSY breaking  

CERN Multimedia

We examine the cancellation mechanism between the different contributions for the electric dipole moment of the neutron in a model with dilaton-dominated SUSY breaking. We find these accidental cancellations occur at few points in parameter space. For a wide region of this space we must constraint the phase of \\mu to be of order 10^{-1} and have the phases of A and \\mu strongly correlated in order to have small neutron EDM. Moreover, we consider the indirect CP violation parameter $\\epsilon$ in this region where the electric dipole moment is less than the experimental limit and find that we can generate

Barr, S M; Khalil, Shaaban

2000-01-01

184

Hadronic EDMs induced by the strangeness and constraints on supersymmetric CP phases  

CERN Multimedia

We consider hadronic CP violation induced by chromoelectric dipolemoments (CEDMs) of light quarks and the QCD theta parameter ($?overline{?theta}$). We concentrate on the strange quark CEDM especially in this paper. Using effective CP violating nucleon interactions induced by the CEDMs and $?overline{?theta}$ with the SU(3) chiral Lagrangian technique, we calculate the EDMs for the $^{199}$Hg atom, neutron and deuteron. We also discuss supersymmetric contributions to the electric dipole moments with the mass insertion approximations and give stringent constraints on the CP phases of the flavor changing SUSY breaking terms.

Hisano, J; Hisano, Junji; Shimizu, Yasuhiro

2004-01-01

185

High-speed micro electrode tool fabrication by a twin-wire EDM system  

International Nuclear Information System (INIS)

[en] This paper describes a new machining process which combines twin-electro-wire together with two electro discharge circuits to rapidly fabricate micro electrode tools. The results show that transistor electro discharge and RC electro discharge circuits coexist to fabricate micro tools with rough and finish machining both on the same machine. Compared to conventional wire electro discharge grinding (WEDG) technology, a twin-wire EDM system that combines rough and finish machining into one process allows the efficient fabrication of micro tools. This high-speed micro tool fabrication process can be applied not only to micro electrode machining but also to micro punching tool and micro probing tips machining

2008-01-01

186

Improving the efficiency of the emissions and dispersion modeling system (EDMS) Version 3.1  

Energy Technology Data Exchange (ETDEWEB)

As a follow-up to last year's technical review of Version 3.0, this paper presents a more detailed analysis of the inefficiencies of the modeling system. Current shortcomings with EDMS 3.1, primarily the ease of entering input data, the computational time needed, and the disk storage space needed, will be shown. The importance of each topic will be conveyed. Examples of each will be given, and recommendations for the improvement of the model will be presented.

Tino, V.R.

1999-07-01

187

Search of prompt electrons in the NA14 photoproduction experiment at the CERN  

International Nuclear Information System (INIS)

The purpose of this thesis is to isolate a prompt electron signal from the data of the NA14 photoproduction experiment at CERN. For that aim, a fast data filtering program has been developed. In order to have a good understanding of the electrons behaviour in the electromagnetic calorimeter, electrons from photon conversion were selected. The observation of events with a reconstructed psi and the sharing between the different psi production mechanism leads to a clear excess of the inelastic process relative to a QCD theoretical expectation. The prompt electrons measurement method, when applied to events obtained from a ?- beam, does not give any evidence for a signal. With incident photons, a strong signal is seen which cannot been explained by the Bethe Heitler mechanism and psi production alone. This signal is stronger than the photon-gluon fusion model prediction

1985-01-01

188

Search for heavy particles decaying into electron-positron pairs in p-pbar collisions  

CERN Document Server

We present results of searches for technirho, techniomega, and Z' particles, using the decay channels technirho, techniomega, Z' -> e+e-. The search is based on 124.8 pb-1 of data collected by the D0 detector at the Fermilab Tevatron during 1992-1996. In the absence of a signal, we set 95% C.L. upper limits on the cross sections for the processes p pbar -> technirho, techniomega, Z' -> e+e- as a function of the mass of the decaying particle. For certain model parameters, we exclude the existence of degenerate technirho and techniomega states with masses below about 200 GeV. We exclude a Z' with mass below 670 GeV, assuming that it has the same couplings to fermions as the Z boson.

Abazov, V M; Abdesselam, A; Abolins, M; Abramov, V; Acharya, B S; Adams, D L; Adams, M; Ahmed, S N; Alexeev, G D; Alves, G A; Amos, N; Anderson, E W; Baarmand, M M; Babintsev, V V; Babukhadia, L R; Bacon, Trevor C; Baden, A; Baldin, B Yu; Balm, P W; Todorova-Nová, S; Barberis, E; Baringer, P; Barreto, J; Bartlett, J F; Bassler, U; Bauer, D; Bean, A; Begel, M; Belyaev, A; Beri, S B; Bernardi, G; Bertram, I; Besson, A; Beuselinck, R; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Bhattacharjee, M; Blazey, G C; Blessing, S; Böhnlein, A; Bozhko, N; Borcherding, F; Bos, Kors; Brandt, A; Breedon, R; Briskin, G M; Brock, R; Brooijmans, G; Bross, A; Buchholz, D; Bühler, M; Büscher, V; Burtovoi, V S; Butler, J M; Canelli, F; Carvalho, W S; Casey, D; Casilum, Z; Castilla-Valdez, H; Chakraborty, D; Chan, K M; Chekulaev, S V; Cho, D K; Choi, S; Chopra, S; Christenson, J H; Chung, M; Claes, D; Clark, A R; Cochran, J; Coney, L; Connolly, B; Cooper, W E; Coppage, D; Cummings, M A C; Cutts, D; Davis, G A; Davis, K; De, K; De Jong, S J; Del Signore, K; Demarteau, M; Demina, R; Demine, P; Denisov, D S; Denisov, S P; Desai, S V; Diehl, H T; Diesburg, M; DiLoreto, G; Doulas, S; Draper, P; Ducros, Y; Dudko, L V; Duensing, S; Duflot, L; Dugad, S R; Dyshkant, A; Edmunds, D; Ellison, J; Elvira, V D; Engelmann, R; Eno, S; Eppley, G; Ermolov, P; Eroshin, O V; Estrada, J; Evans, H; Evdokimov, V N; Fahland, T; Fehér, S; Fein, D; Ferbel, T; Filthaut, Frank; Fisk, H E; Fisyak, Yu; Flattum, E M; Fleuret, F; Fortner, M R; Frame, K C; Fuess, S; Gallas, E; Galjaev, A N; Gao, M; Gavrilov, V; Genik, R J; Genser, K; Gerber, C E; Gershtein, Yu; Gilmartin, R; Ginther, G; Gómez, B; Gómez, G; Goncharov, P I; González-Solis, J L; Gordon, H; Goss, L T; Gounder, K; Goussiou, A; Graf, N; Graham, G; Grannis, P D; Green, J A; Greenlee, H; Grinstein, S; Groer, L S; Grünendahl, S; Sen-Gupta, A; Gurzhev, S N; Gutíerrez, G; Gutíerrez, P; Hadley, N J; Haggerty, H; Hagopian, S L; Hagopian, V; Hall, R E; Hanlet, P; Hansen, S; Hauptman, J M; Hays, C; Hebert, C; Hedin, D; Heinson, A P; Heintz, U; Heuring, T C; Hildreth, M D; Hirosky, R; Hobbs, J D; Hoeneisen, B; Huang, Y; Illingworth, R; Ito, A S; Jaffré, M; Jain, S; Jesik, R; Johns, K; Johnson, M; Jonckheere, A; Jones, M; Jöstlein, H; Juste, A; Kahn, S; Kajfasz, E; Kalinin, A M; Karmanov, D E; Karmgard, D J; Kehoe, R; Kharchilava, A I; Kim, S K; Klima, B; Knuteson, B; Ko, W; Kohli, J M; Kostritskii, A V; Kotcher, J; Kotwal, A V; Kozelov, A V; Kozlovskii, E A; Krane, J; Krishnaswamy, M R; Krivkova, P; Krzywdzinski, S; Kubantsev, M A; Kuleshov, S; Kulik, Y; Kunori, S; Kupco, A; Kuznetsov, V E; Landsberg, G L; Leflat, A; Leggett, C; Lehner, F; Li, J; Li, Q Z; Lima, J G R; Lincoln, D; Linn, S L; Linnemann, J T; Lipton, R; Lucotte, A; Lueking, L H; Lundstedt, C; Luo, C; Maciel, A K A; Madaras, R J; Malyshev, V L; Manankov, V; Mao, H S; Marshall, T; Martin, M I; Martin, R D; Mauritz, K M; May, B; Mayorov, A A; McCarthy, R; McDonald, J; McMahon, T; Melanson, H L; Merkin, M; Merritt, K W B; Miao, C; Miettinen, H; Mihalcea, D; Mishra, C S; Mokhov, N V; Mondal, N K; Montgomery, H E; Moore, R W; Mostafa, M A; Da Motta, H; Nagy, E; Nang, F; Narain, M; Narasimham, V S; Neal, H A; Negret, J P; Negroni, S; Nunnemann, T; O'Neil, D C; Oguri, V; Olivier, B; Oshima, N; Padley, P; Pan, L J; Papageorgiou, K; Para, A; Parashar, N; Partridge, R; Parua, N; Paterno, M; Patwa, A; Pawlik, B; Perkins, J; Peters, M; Peters, O; Petroff, P; Piegaia, R; Piekarz, H; Pope, B G; Popkov, E; Prosper, H B; Protopopescu, S D; Qian, J; Raja, R; Rajagopalan, S; Ramberg, E; Rapidis, P A; Reay, N W; Reucroft, S; Rha, J; Ridel, M; Rijssenbeek, M; Rockwell, T; Roco, M T; Rubinov, P; Ruchti, R C; Rutherfoord, John P; Sabirov, B M; Santoro, A F S; Sawyer, L; Schamberger, R D; Schellman, H; Schwartzman, A; Sen, N; Shabalina, E; Shivpuri, R K; Shpakov, D; Shupe, M A; Sidwell, R A; Simák, V; Singh, H; Singh, J B; Sirotenko, V I; Slattery, P F; Smith, E; Smith, R P; Snihur, R; Snow, G A; Snow, J; Snyder, S; Solomon, J; Sorin, V; Sosebee, M; Sotnikova, N; Soustruznik, K; Souza, M; Stanton, N R; Steinbruck, G; Stephens, R W; Stichelbaut, F; Stoker, D; Stolin, V; Stoyanova, D A; Strauss, M; Strovink, M; Stutte, L; Sznajder, A; Taylor, W; Tentindo-Repond, S; Tripathi, S M; Trippe, T G; Turcot, A S; Tuts, P M; Van Gemmeren, P; Vaniev, V; Van Kooten, R; Varelas, N; Vertogradov, L S; Volkov, A A; Vorobev, A P; Wahl, H D; Wang, H; Wang, Z M; Warchol, J; Watts, G; Wayne, M; Weerts, H; White, A; White, J T; Whiteson, D; Wightman, J A; Wijngaarden, D A; Willis, S; Wimpenny, S J; Womersley, J; Wood, D R; Yamada, R; Yamin, P; Yasuda, T; Yatsunenko, Yu A; Yip, K; Youssef, S; Yu, J; Yu, Z; Zanabria, M E; Zheng, H; Zhou, Z; Zielinski, M; Zieminska, D; Zieminski, A; Zutshi, V; Zverev, E G; Zylberstejn, A

2001-01-01

189

Second User Acceptance Test of the Electronic Document Management System at the Defense Finance and Accounting Service Operating Location Omaha, Nebraska.  

Science.gov (United States)

The overall evaluation objective was to determine whether the Electronic Document Management (EDM) system can satisfactorily execute vendor payment workflows while providing adequate security for system and production data. Specifically, we determined whe...

1997-01-01

190

Search for pair production of the scalar top quark in the electron-muon final state  

CERN Multimedia

We report the result of a search for the pair production of the lightest supersymmetric partner of the top quark ($\\tilde{t}_1$) in $p\\bar{p}$ collisions at a center-of-mass energy of 1.96 TeV at the Fermilab Tevatron collider corresponding to an integrated luminosity of 5.4 fb$^{-1}$. The scalar top quarks are assumed to decay into a $b$ quark, a charged lepton, and a scalar neutrino ($\\tilde{\

Abazov, V M; Abolins, M; Acharya, B S; Adams, M; Adams, T; Alexeev, G D; Alkhazov, G; Altona, A; Alverson, G; Alves, G A; Ancu, L S; Aoki, M; Arnoud, Y; Arov, M; Askew, A; \\degAsman, B; Atramentov, O; Avila, C; BackusMayes, J; Badaud, F; Bagby, L; Baldin, B; Bandurin, D V; Banerjee, S; Barberis, E; Baringer, P; Barreto, J; Bartlett, J F; Bassler, U; Bazterra, V; Beale, S; Bean, A; Begalli, M; Begel, M; Belanger-Champagne, C; Bellantoni, L; Beri, S B; Bernardi, G; Bernhard, R; Bertram, I; Besançon, M; Beuselinck, R; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Blazey, G; Blessing, S; Bloom, K; Boehnlein, A; Boline, D; Bolton, T A; Boos, E E; Borissov, G; Bose, T; Brandt, A; Brandt, O; Brock, R; Brooijmans, G; Bross, A; Brown, D; Brown, J; Bu, X B; Buchholz, D; Buehler, M; Buescher, V; Bunichev, V; Burdinb, S; Burnett, T H; Buszello, C P; Calpas, B; Camacho-Pérez, E; Carrasco-Lizarraga, M A; Casey, B C K; Castilla-Valdez, H; Chakrabarti, S; Chakraborty, D; Chan, K M; Chandra, A; Chen, G; Chevalier-Théry, S; Cho, D K; Cho, S W; Choi, S; Choudhary, B; Christoudias, T; Cihangir, S; Claes, D; Clutter, J; Cooke, M; Cooper, W E; Corcoran, M; Couderc, F; Cousinou, M -C; Croc, A; Cutts, D; ?wiok, M; Das, A; Davies, G; De, K; de Jong, S J; De La Cruz-Burelo, E; Déliot, F; Demarteau, M; Demina, 47 R; Denisov, D; Denisov, S P; Desai, S; DeVaughan, K; Diehl, H T; Diesburg, M; Dominguez, A; Dorland, T; Dubey, A; Dudko, L V; Duggan, D; Duperrin, A; Dutt, S; Dyshkant, A; Eads, M; Edmunds, D; Ellison, J; Elvira, V D; Enari, Y; Eno, S; Evans, H; Evdokimov, A; Evdokimov, V N; Facini, G; Ferbel, T; Fiedler, F; Filthaut, F; Fisher, W; Fisk, H E; Fortner, M; Fox, H; Fuess, S; Gadfort, T; Garcia-Bellido, A; Gavrilov, V; Gay, P; Geist, W; Geng, W; Gerbaudo, D; Gerber, C E; Gershtein, Y; Ginther, G; Golovanov, G; Goussiou, A; Grannis, P D; Greder, S; Greenlee, H; Greenwood, Z D; Gregores, E M; Grenier, G; Gris, Ph; Grivaz, J -F; Grohsjean, A; Grünendahl, S; Grünewald, M W; Guo, F; Guo, J; Gutierrez, G; Gutierrez, P; Haasc, A; Hagopian, S; Haley, J; Han, L; Harder, K; Harel, A; Hauptman, J M; Hays, J; Head, T; Hebbeker, T; Hedin, D; Hegab, H; Heinson, A P; Heintz, U; Hensel, C; La Cruz, I Heredia-De; Herner, K; Hesketh, G; Hildreth, M D; Hirosky, R; Hoang, T; Hobbs, J D; Hoeneisen, B; Hohlfeld, M; Hossain, S; Hubacek, Z; Huske, N; Hynek, V; Iashvili, I; Illingworth, R; Ito, A S; Jabeen, S; Jaffré, M; Jain, S; Jamin, D; Jesik, R; Johns, K; Johnson, M; Johnston, D; Jonckheere, A; Jonsson, P; Joshi, J; Justed, A; Kaadze, K; Kajfasz, E; Karmanov, D; Kasper, P A; Katsanos, I; Kehoe, R; Kermiche, S; Khalatyan, N; Khanov, A; Kharchilava, A; Kharzheev, Y N; Khatidze, D; Kirby, M H; Kohli, J M; Kozelov, A V; Kraus, J; Kumar, A; Kupco, A; Kur?a, T; Kuzmin, V A; Kvita, J; Lammers, S; Landsberg, G; Lebrun, P; Lee, H S; Lee, S W; Lee, W M; Lellouch, J; Li, L; Li, Q Z; Lietti, S M; Lim, J K; Lincoln, D; Linnemann, J; Lipaev, V V; Lipton, R; Liu, Y; Liu, Z; Lobodenko, A; Lokajicek, M; Love, P; Lubatti, H J; Luna-Garciae, R; Lyon, A L; Maciel, A K A; Mackin, D; Madar, R; Magaña-Villalba, R; Malik, S; Malyshev, V L; Maravin, Y; Martínez-Ortega, J; McCarthy, R; McGivern, C L; Meijer, M M; Melnitchouk, A; Menezes, D; Mercadante, P G; Merkin, M; Meyer, A; Meyer, J; Mondal, N K; Muanza, G S; Mulhearn, M; Nagy, E; Naimuddin, M; Narain, M; Nayyar, R; Neal, H A; Negret, J P; Neustroev, P; Novaes, S F; Nunnemann, T; Obrant, G; Orduna, J; Osman, N; Osta, J; Garzón, G J Otero y; Owen, M; Padilla, M; Pangilinan, M; Parashar, N; Parihar, V; Park, S K; Parsons, J; Partridgec, R; Parua, N; Patwa, A; Penning, B; Perfilov, M; Peters, K; Peters, Y; Petrillo, G; Pétroff, P; Piegaia, R; Piper, J; Pleier, M -A; Podesta-Lermaf, P L M; Podstavkov, V M; Pol, M -E; Polozov, P; Popov, A V; Prewitt, M; Price, D; Protopopescu, S; Qian, J; Quadt, A; Quinn, B; Rangel, M S; Ranjan, K; Ratoff, P N; Razumov, I; Renkel, P; Rich, P; Rijssenbeek, M; Ripp-Baudot, I; Rizatdinova, F; Rominsky, M; Royon, C; Rubinov, P; Ruchti, R; Safronov, G; Sajot, G; Sánchez-Hernández, A; Sanders, M P; Sanghi, B; Santos, A S; Savage, G; Sawyer, L; Scanlon, T; Schamberger, R D; Scheglov, Y; Schellman, H; Schliephake, T; Schlobohm, S; Schwanenberger, C; Schwienhorst, R; Sekaric, J; Severini, H; Shabalina, E; Shary, V; Shchukin, A A; Shivpuri, R K; Simak, V; Sirotenko, V; Skubic, P; Slattery, P; Smirnov, D; Smith, K J; Snow, G R; Snow, J; Snyder, S; Söldner-Rembold, S; Sonnenschein, L; Sopczak, A; Sosebee, M; Soustruznik, K; Spurlock, B; Stark, J; Stolin, V; Stoyanova, D A; Strauss, E; Strauss, M; Strom, D; Stutte, L; Svoisky, P; Takahashi, M; Tanasijczuk, A; Taylor, W; Titov, M; Tokmenin, V V; Tsybychev, D; Tuchming, B; Tully, C; Tuts, P M; Uvarov, L; Uzunyan, S Uvarov S; Van Kooten, R; van Leeuwen, W M; Varelas, N; Varnes, E W; Vasilyev, I A; Verdier, P

2010-01-01

191

Results of a search for double positron decay and electron-positron conversion of 78Kr  

International Nuclear Information System (INIS)

The results of a search for the 2?+ and K?+ decay modes of 78Kr, in a coincidence experiment using a high pressure ionization chamber of enriched 78Kr inside an array of sodium iodine scintillators, are presented. After 4434 h of counting time, the half-life lower limits obtained are T1/2(K?+)0??5.1x1021 yr and T1/2(2?+)0?+2??2.0x1021 yr at 68% C.L.

1994-01-01

192

Search for muon-neutrino to electron-neutrino transitions in MINOS.  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This Letter reports on a search for nu(mu) --> nu(e) transitions by the MINOS experiment based on a 3.14x10(20) protons-on-target exposure in the Fermilab NuMI beam. We observe 35 events in the Far Detector with a background of 27+/-5(stat)+/-2(syst) events predicted by the measurements in the Near ...

Adamson, P; Andreopoulos, C; Arms, KE; Armstrong, R; Auty, DJ

193

Theoretical framework to analyze searches for hidden light gauge bosons in electron scattering fixed target experiments  

Science.gov (United States)

Motivated by anomalies in cosmic ray observations and by attempts to solve questions of the Standard Model of particle physics like the (g-2)? discrepancy, U(1) extensions of the Standard Model have been proposed in recent years. Such U(1) extensions allow for the interaction of dark matter by exchange of a photonlike massive force carrier ?' not included in the Standard Model. In order to search for ?' bosons, various experimental programs have been started. One approach is the dedicated search at fixed-target experiments at modest energies as performed at microtron (MAMI) or at the Jefferson Lab. In these experiments the process e(A,Z)?e(A,Z)l+l- is investigated, and a search for a very narrow resonance in the invariant mass distribution of the l+l- pair is performed. In this work we analyze this process in terms of signal and background in order to describe existing data obtained by the A1 experiment at MAMI with the aim to give accurate predictions for exclusion limits in the ?' parameter space. We present a detailed theoretical analysis of the cross sections entering in the description of such processes.

Beranek, T.; Merkel, H.; Vanderhaeghen, M.

2013-07-01

194

Improved search for Muon-neutrino to electron-neutrino oscillations in MINOS.  

Science.gov (United States)

We report the results of a search for ?(e) appearance in a ?(?) beam in the MINOS long-baseline neutrino experiment. With an improved analysis and an increased exposure of 8.2 × 10(20) protons on the NuMI target at Fermilab, we find that 2 sin(2) (?(23))sin(2)(2?(13))neutrino mass hierarchy, with a best-fit of 2sin(2) (?(23))sin(2)(2?(13)) = 0.041(-0.031)(+0.047) (0.079(-0.053) (+0.071)). The ?(13) = 0 hypothesis is disfavored by the MINOS data at the 89% confidence level. PMID:22107623

Adamson, P; Auty, D J; Ayres, D S; Backhouse, C; Barr, G; Betancourt, M; Bishai, M; Blake, A; Bock, G J; Boehnlein, D J; Bogert, D; Cao, S V; Cavanaugh, S; Cherdack, D; Childress, S; Coelho, J A B; Corwin, L; Cronin-Hennessy, D; Danko, I Z; de Jong, J K; Devenish, N E; Diwan, M V; Dorman, M; Escobar, C O; Evans, J J; Falk, E; Feldman, G J; Frohne, M V; Gallagher, H R; Gomes, R A; Goodman, M C; Gouffon, P; Graf, N; Gran, R; Grzelak, K; Habig, A; Hartnell, J; Hatcher, R; Himmel, A; Holin, A; Huang, X; Hylen, J; Irwin, G M; Isvan, Z; Jaffe, D E; James, C; Jensen, D; Kafka, T; Kasahara, S M S; Koizumi, G; Kopp, S; Kordosky, M; Kreymer, A; Lang, K; Lefeuvre, G; Ling, J; Litchfield, P J; Loiacono, L; Lucas, P; Mann, W A; Marshak, M L; Mathis, M; Mayer, N; McGowan, A M; Mehdiyev, R; Meier, J R; Messier, M D; Michael, D G; Miller, W H; Mishra, S R; Mitchell, J; Moore, C D; Mualem, L; Mufson, S; Musser, J; Naples, D; Nelson, J K; Newman, H B; Nichol, R J; Nowak, J A; Ochoa-Ricoux, J P; Oliver, W P; Orchanian, M; Paley, J; Patterson, R B; Pawloski, G; Pearce, G F; Phan-Budd, S; Plunkett, R K; Qiu, X; Ratchford, J; Rebel, B; Rosenfeld, C; Rubin, H A; Sanchez, M C; Schneps, J; Schreckenberger, A; Schreiner, P; Shanahan, P; Sharma, R; Sousa, A; Tagg, N; Talaga, R L; Thomas, J; Thomson, M A; Toner, R; Torretta, D; Tzanakos, G; Urheim, J; Vahle, P; Viren, B; Walding, J J; Weber, A; Webb, R C; White, C; Whitehead, L; Wojcicki, S G; Yang, T; Zwaska, R

2011-10-27

195

Results of a search for double positron decay and electron-positron conversion of 78Kr  

International Nuclear Information System (INIS)

The preliminary results of a search for the 2?+ and K?+ in a coincidence experiment using a high pressure ionization chamber of enriched 78Kr inside a NaI scintillator are presented in this paper. After 4434 hours of counting time, the half-time limits obtained are T1/2(K?+)0??5.8*1021 y and T1/2(2?+)0?+2??2.0*1021 y at 68% C.L. These are the best world limits for the 2?+ and K?+ decay modes. (authors). 6 refs., 3 figs.

1993-02-06

196

Investigating effects of process variables on MRR in EDM by using Taguchi parameter design approach  

Directory of Open Access Journals (Sweden)

Full Text Available The correct selection of manufacturing conditions is one of the most important aspects to take into consideration in the majority of manufacturing processes and, particularly, in processes related to Electrical Discharge Machining (EDM). It is a capable of machining geometrically complex or hard material components, that are precise and difficult-to-machine such as heat treated tool steels, composites, super alloys, ceramics, carbides, heat resistant steels etc. being widely used in die and mold making industries, aerospace, aeronautics and nuclear industries. OHNS-EN-31 is a high car bon alloy steel which achieves high degree of hardness with compressive strength and abrasive resistance. OHNS-EN-31 steel, which is popularly used in automotive type applications, like axle, bearings, spindle and molding dies etc. In this paper we have tried to investigate effect of machining parameter such as discharge current, pulse on time, and pulse of time on MRR in EDM while machining OHNS-EN-31 STEEL using Cu tool . A well-designed experimental scheme was used to reduce the total number of experiments. Parts of the experiment were conducted with the L18 orthogonal array based on the Taguchi method. The results of analysis of variance (ANOVA) indicate that the proposed mathematical model can be adequately describe the performance within the limit of factors being studied. The optimal set of process parameters has also been predicted to maximize the MRR.

Amit Joshi; Pradeep Kothiyal

2012-01-01

197

LHC collision event at CMS showing four high energy electrons (CMS Higgs search)  

CERN Document Server

11sec animation of a Higgs->ZZ->4e candidate in CMS. Real CMS proton-proton collision events in which 4 high energy electrons (orange lines and towers) are observed. The event shows characteristics expected from the decay of a Higgs boson but is also consistent with background Standard Model physics processes.

CMS Collaboration

2011-01-01

198

Perspectives for indirect dark matter search with AMS-2 using cosmic-ray electrons and positrons  

Energy Technology Data Exchange (ETDEWEB)

The AMS-2 experiment will be launched with the Space Shuttle Discovery and installed on the International Space Station in 2010. It is designed to perform precision spectroscopy of many different cosmic-ray species including electrons and positrons. While the nature of dark matter is as yet unknown, dark matter annihilating in the Galactic halo is a well-motivated source of cosmic-ray electrons and positrons. The cosmic-ray positron fraction data available so far show significant deviations between different measurements and from the expectation for purely secondary production. The differences between the measurements up to particle energies of 6 GeV can be understood in a framework of charge-sign-dependent solar modulation and the spectra show excellent agreement if corrected for these time-dependent effects. Recent observations of an excess in the high-energy electron spectrum by ATIC might be connected to the excess in the positron fraction. A possible source of both signatures could be dark matter annihilation or a nearby pulsar. A measurement of the anisotropy of high-energy electrons could distinguish between both scenarios. Therefore the sky coverage of AMS-2 will be discussed in addition to possible dark matter scenarios and the sensitivity of the AMS-2 experiment to these effects.

Beischer, B; Von Doetinchem, P; Gast, H; Kirn, T; Schael, S [I. Physikalisches Institut, RWTH Aachen University, 52074 Aachen (Germany)], E-mail: Stefan.Schael@physik.rwth-aachen.de

2009-10-15

199

Search for dispersive effects in elastic electron scattering from /sup 12/C  

International Nuclear Information System (INIS)

A significant energy dependence was observed in the region of the first diffraction minimum of the form factor for elastic electron scattering from /sup 12/C between 238 and 419 (and 431) MeV. This effect might be attributed to dispersive (two-step) processes

1986-09-29

200

Search for dispersive effects in elastic electron scattering from /sup 12/C  

Energy Technology Data Exchange (ETDEWEB)

A significant energy dependence was observed in the region of the first diffraction minimum of the form factor for elastic electron scattering from /sup 12/C between 238 and 419 (and 431) MeV. This effect might be attributed to dispersive (two-step) processes.

Offermann, E.A.J.M.; Cardman, L.S.; Emrich, H.J.; Fricke, G.; de Jager, C.W.; Miska, H.; Rychel, D.; de Vries, H.

1986-09-29

 
 
 
 
201

Search for Heavy Particles Decaying into Electron-Positron Pairs in p  

Energy Technology Data Exchange (ETDEWEB)

We present results of searches for technirho ({rho}{sub T}) , techniomega ({omega}{sub T}) , and Z' particles, using the decay channels {rho}{sub T},{omega}{sub T},Z' {yields}e{sup +}e{sup -} . The search is based on 124.8 pb{sup -1} of data collected by the D0 detector at the Fermilab Tevatron during 1992--1996. In the absence of a signal, we set 95% C.L.upper limits on the cross sections for the processes p{bar p}{yields}{rho}{sub T},{omega}{sub T}, Z'{yields}e{sup +}e{sup -} as a function of the mass of the decaying particle. For certain model parameters, we exclude the existence of degenerate {rho}{sub T} and {omega}{sub T} states with masses below about 200GeV. We exclude a Z' with mass below 670GeV, assuming that it has the same couplings to fermions as the Z boson.

Abazov, V. M.; Abbott, B.; Abdesselam, A.; Abolins, M.; Abramov, V.; Acharya, B. S.; Adams, D. L.; Adams, M.; Ahmed, S. N.; Alexeev, G. D. (and others)

2001-08-06

202

Electronic document management systems: an overview.  

Science.gov (United States)

For over a decade, most health care information technology (IT) professionals erroneously learned that document imaging, which is one of the many component technologies of an electronic document management system (EDMS), is the only technology of an EDMS. In addition, many health care IT professionals erroneously believed that EDMSs have either a limited role or no place in IT environments. As a result, most health care IT professionals do not understand documents and unstructured data and their value as structured data partners in most aspects of transaction and information processing systems. PMID:12402630

Kohn, Deborah

2002-08-01

203

Electronic document management systems: an overview.  

UK PubMed Central (United Kingdom)

For over a decade, most health care information technology (IT) professionals erroneously learned that document imaging, which is one of the many component technologies of an electronic document management system (EDMS), is the only technology of an EDMS. In addition, many health care IT professionals erroneously believed that EDMSs have either a limited role or no place in IT environments. As a result, most health care IT professionals do not understand documents and unstructured data and their value as structured data partners in most aspects of transaction and information processing systems.

Kohn D

2002-08-01

204

Search for Urbach tails in the optical absorption spectra of solvated electrons in alcohols and water  

Energy Technology Data Exchange (ETDEWEB)

The high-energy side of the optical absorption spectra of solvated electrons in several liquid alcohols and water has been analyzed for the first time within an Urbach tail scheme, assuming direct bound-to-continuum transitions. For all the studied alcohols and water, the solvated electron absorbance coefficients, taken from experimental data in the literature, vary exponentially with photon energy. In the case of alcohols, the semilogarithmic plots of the absorbance vs energy have a common intersection independent of temperature, whereas in water, the slops of these straight lines do not vary with temperature. Assuming the validity of the Urbach tail scheme, we have extracted the parameters which characterize the structural and thermal components of the disorder. We conclude that, in alcohols, thermal disorder is the main component, whereas in water, the effect of structural disorder dominates.

Houee-Levin, C.; Tannous, C.; Jay-Gerin, J.P. (Universite de Sherbrooke, Quebec (Canada))

1989-10-05

205

Search for Scalar Leptoquark Pairs Decaying to Electrons and Jets in pp Collisions  

International Nuclear Information System (INIS)

We have searched for the pair production of first generation scalar leptoquarks in the eejj channel using the full data set (123 pb-1) collected with the D0 detector at the Fermilab Tevatron during 1992 endash 1996. We observe no candidates with an expected background of approximately 0.4 events. Comparing the experimental 95% confidence level upper limit to theoretical calculations of the cross section with the assumption of a 100% branching fraction of eq, we set a lower limit on the mass of a first generation scalar leptoquark of 225 GeV/c2. The results of this analysis rule out the interpretation of the excess of high Q2 events at DESY HERA as leptoquarks which decay exclusively to eq. copyright 1997 The American Physical Society.

1997-01-01

206

Improved search for Muon-neutrino to electron-neutrino oscillations in MINOS.  

UK PubMed Central (United Kingdom)

We report the results of a search for ?(e) appearance in a ?(?) beam in the MINOS long-baseline neutrino experiment. With an improved analysis and an increased exposure of 8.2 × 10(20) protons on the NuMI target at Fermilab, we find that 2 sin(2) (?(23))sin(2)(2?(13))<0.12(0.20) at 90% confidence level for ? = 0 and the normal (inverted) neutrino mass hierarchy, with a best-fit of 2sin(2) (?(23))sin(2)(2?(13)) = 0.041(-0.031)(+0.047) (0.079(-0.053) (+0.071)). The ?(13) = 0 hypothesis is disfavored by the MINOS data at the 89% confidence level.

Adamson P; Auty DJ; Ayres DS; Backhouse C; Barr G; Betancourt M; Bishai M; Blake A; Bock GJ; Boehnlein DJ; Bogert D; Cao SV; Cavanaugh S; Cherdack D; Childress S; Coelho JA; Corwin L; Cronin-Hennessy D; Danko IZ; de Jong JK; Devenish NE; Diwan MV; Dorman M; Escobar CO; Evans JJ; Falk E; Feldman GJ; Frohne MV; Gallagher HR; Gomes RA; Goodman MC; Gouffon P; Graf N; Gran R; Grzelak K; Habig A; Hartnell J; Hatcher R; Himmel A; Holin A; Huang X; Hylen J; Irwin GM; Isvan Z; Jaffe DE; James C; Jensen D; Kafka T; Kasahara SM; Koizumi G; Kopp S; Kordosky M; Kreymer A; Lang K; Lefeuvre G; Ling J; Litchfield PJ; Loiacono L; Lucas P; Mann WA; Marshak ML; Mathis M; Mayer N; McGowan AM; Mehdiyev R; Meier JR; Messier MD; Michael DG; Miller WH; Mishra SR; Mitchell J; Moore CD; Mualem L; Mufson S; Musser J; Naples D; Nelson JK; Newman HB; Nichol RJ; Nowak JA; Ochoa-Ricoux JP; Oliver WP; Orchanian M; Paley J; Patterson RB; Pawloski G; Pearce GF; Phan-Budd S; Plunkett RK; Qiu X; Ratchford J; Rebel B; Rosenfeld C; Rubin HA; Sanchez MC; Schneps J; Schreckenberger A; Schreiner P; Shanahan P; Sharma R; Sousa A; Tagg N; Talaga RL; Thomas J; Thomson MA; Toner R; Torretta D; Tzanakos G; Urheim J; Vahle P; Viren B; Walding JJ; Weber A; Webb RC; White C; Whitehead L; Wojcicki SG; Yang T; Zwaska R

2011-10-01

207

Search for muon-neutrino to electron-neutrino transitions in MINOS  

Energy Technology Data Exchange (ETDEWEB)

This letter reports on a search for {nu}{sub {mu}} {yields} {nu}{sub e} transitions by the MINOS experiment based on a 3.14 x 10{sup 20} protons-on-target exposure in the Fermilab NuMI beam. We observe 35 events in the Far Detector with a background of 27 {+-} 5(stat.) {+-} 2(syst.) events predicted by the measurements in the Near Detector. If interpreted in terms of {nu}{sub {mu}} {yields} {nu}{sub e} oscillations, this 1.5 {sigma} excess of events is consistent with sin{sup 2}(2{theta}{sub 13}) comparable to the CHOOZ limit when |{Delta}m{sup 2}| = 2.43 x 10{sup -3} eV{sup 2} and sin{sup 2} (2{theta}{sub 23}) = 1.0 are assumed.

Adamson, P.; /Fermilab; Andreopoulos, C.; /Rutherford; Arms, K.E.; /Minnesota U.; Armstrong, R.; /Indiana U.; Auty, D.J.; /Sussex U.; Ayres, D.S.; /Argonne; Backhouse, C.; /Oxford U.; Barnes, P.D., Jr.; /LLNL, Livermore; Barr, G.; /Oxford U.; Barrett, W.L.; /Western Washington U.; Becker, B.R.; /Minnesota U. /Rutherford

2009-09-01

208

Search for muon-neutrino to electron-neutrino transitions in MINOS.  

Science.gov (United States)

This Letter reports on a search for nu(mu) --> nu(e) transitions by the MINOS experiment based on a 3.14x10(20) protons-on-target exposure in the Fermilab NuMI beam. We observe 35 events in the Far Detector with a background of 27+/-5(stat)+/-2(syst) events predicted by the measurements in the Near Detector. If interpreted in terms of nu(mu) --> nu(e) oscillations, this 1.5sigma excess of events is consistent with sin2(2theta(13)) comparable to the CHOOZ limit when |Delta m2|=2.43x10(-3) eV2 and sin2(2theta(23))=1.0 are assumed. PMID:20366304

Adamson, P; Andreopoulos, C; Arms, K E; Armstrong, R; Auty, D J; Ayres, D S; Backhouse, C; Barnes, P D; Barr, G; Barrett, W L; Becker, B R; Belias, A; Bernstein, R H; Betancourt, M; Bhattacharya, D; Bishai, M; Blake, A; Bock, G J; Boehm, J; Boehnlein, D J; Bogert, D; Bower, C; Cavanaugh, S; Chapman, J D; Cherdack, D; Childress, S; Choudhary, B C; Cobb, J H; Coelho, J A B; Coleman, S J; Cronin-Hennessy, D; Culling, A J; Danko, I Z; de Jong, J K; Devenish, N E; Diwan, M V; Dorman, M; Erwin, A R; Escobar, C O; Evans, J J; Falk, E; Feldman, G J; Frohne, M V; Gallagher, H R; Godley, A; Goodman, M C; Gouffon, P; Gran, R; Grashorn, E W; Grzelak, K; Habig, A; Harris, D; Harris, P G; Hartnell, J; Hatcher, R; Heller, K; Himmel, A; Holin, A; Howcroft, C; Huang, X; Hylen, J; Irwin, G M; Isvan, Z; Jaffe, D E; James, C; Jensen, D; Kafka, T; Kasahara, S M S; Koizumi, G; Kopp, S; Kordosky, M; Koskinen, D J; Krahn, Z; Kreymer, A; Lang, K; Ling, J; Litchfield, P J; Litchfield, R P; Loiacono, L; Lucas, P; Ma, J; Mann, W A; Marshak, M L; Marshall, J S; Mayer, N; McGowan, A M; Mehdiyev, R; Meier, J R; Messier, M D; Metelko, C J; Michael, D G; Miller, W H; Mishra, S R; Mitchell, J; Moore, C D; Morfín, J; Mualem, L; Mufson, S; Musser, J; Naples, D; Nelson, J K; Newman, H B; Nichol, R J; Nicholls, T C; Ochoa-Ricoux, J P; Oliver, W P; Ospanov, R; Paley, J; Para, A; Patterson, R B; Patzak, T; Pavlovi?, Z; Pawloski, G; Pearce, G F; Petyt, D A; Pittam, R; Plunkett, R K; Rahaman, A; Rameika, R A; Raufer, T M; Rebel, B; Reichenbacher, J; Rodrigues, P A; Rosenfeld, C; Rubin, H A; Ryabov, V A; Sanchez, M C; Saoulidou, N; Schneps, J; Schreiner, P; Shanahan, P; Smart, W; Smith, C; Sousa, A; Speakman, B; Stamoulis, P; Strait, M; Tagg, N; Talaga, R L; Thomas, J; Thomson, M A; Thron, J L; Tinti, G; Toner, R; Tsarev, V A; Tzanakos, G; Urheim, J; Vahle, P; Viren, B; Ward, D R; Watabe, M; Weber, A; Webb, R C; West, N; White, C; Whitehead, L; Wojcicki, S G; Wright, D M; Yang, T; Zhang, K; Zheng, H; Zois, M; Zwaska, R

2009-12-29

209

Proceedings of the International Conference on Educational Data Mining (EDM) (4th, Eindhoven, the Netherlands, July 6-8, 2011)  

Science.gov (United States)

The 4th International Conference on Educational Data Mining (EDM 2011) brings together researchers from computer science, education, psychology, psychometrics, and statistics to analyze large datasets to answer educational research questions. The conference, held in Eindhoven, The Netherlands, July 6-9, 2011, follows the three previous editions…

Pechenizkiy, Mykola; Calders, Toon; Conati, Cristina; Ventura, Sebastian; Romero, Cristobal; Stamper, John

2011-01-01

210

Search for parity violation in deep-inelastic scattering of polarized electrons by unpolarized deuterons  

International Nuclear Information System (INIS)

We report on recent asymmetry measurements for inelastic scattering of longitudinally polarized electrons from an unpolarized deuterium target at 19.4 GeV. Using the SLAC 20-GeV/c and 8-GeV/c spectrometers, the helicity-dependent cross-section asymmetries were measured at Q2 values of 1.2 and 4.2 GeV/c2, and were found to be less than 2 x 10-3 and 7 x 10-3, respectively

1978-10-01

211

Search for cyclopropylbenzene conformers by studying the S1 ? S0 electronic transition  

Science.gov (United States)

The resonance-enhanced multiphoton ionization, (1+1) REMPI and (2+2) REMPI S1 ? S0 spectra of cyclopropylbenzene (CPBz) have been measured in supersonic jet expansion under various cooling conditions. Both spectra include the pure electronic transition and one vibrationally induced transition. The vibronic analysis of these spectra revealed the presence of only one conformer. The present experiment cannot give the form of the conformer. The bisected structure, which was found by microwave spectroscopy [Q. Shen, C. Wells, M. Traetteberg, R.K. Bohn, A. Willis, J. Knee, J. Org. Chem., 66 (2001) 5840] is acceptable.

Philis, John G.; Wategaonkar, Sanjay

2007-05-01

212

Search for electron screening of nuclear reactions at sub-Coulomb energies  

International Nuclear Information System (INIS)

The reaction 3He(d, p)4He has been investigated for E = 6 t 42 keV with the use of D projectiles and 3He atomic gas target nuclides as well as with 3He projectiles and D2 molecular gas target nuclides. These studies show for the first time the predicted effects of electron screening on low-energy fusion cross sections, i.e. a nearly exponential enhancement of the cross sections compared to the case of bare nuclei. The enhancement is about a factor of 2 smaller for the case d(3He, p)4He due to the molecular nature of the D2 target nuclides. The reactions 6Li(p, ?)3He and 7Li(p, ?)4He have also been studied for E = 10 to 65 keV with the use of solid LiF targets. The results also indicate an exponential enhancement due to the effects of electron screening. (orig.).

1989-01-01

213

Search for electron screening of nuclear reactions at sub-Coulomb energies  

Energy Technology Data Exchange (ETDEWEB)

The reaction /sup 3/He(d, p)/sup 4/He has been investigated for E = 6 t 42 keV with the use of D projectiles and /sup 3/He atomic gas target nuclides as well as with /sup 3/He projectiles and D/sub 2/ molecular gas target nuclides. These studies show for the first time the predicted effects of electron screening on low-energy fusion cross sections, i.e. a nearly exponential enhancement of the cross sections compared to the case of bare nuclei. The enhancement is about a factor of 2 smaller for the case d(/sup 3/He, p)/sup 4/He due to the molecular nature of the D/sub 2/ target nuclides. The reactions /sup 6/Li(p, /alpha/)/sup 3/He and /sup 7/Li(p, /alpha/)/sup 4/He have also been studied for E = 10 to 65 keV with the use of solid LiF targets. The results also indicate an exponential enhancement due to the effects of electron screening. (orig.).

Schroeder, U.; Engstler, S.; Krauss, A.; Neldner, K.; Rolfs, C.; Somorjai, E.; Langanke, K.

1989-04-01

214

A combined muon-neutrino and electron-neutrino oscillation search at MiniBooNE  

Energy Technology Data Exchange (ETDEWEB)

MiniBooNE seeks to corroborate or refute the unconfirmed oscillation result from the LSND experiment. If correct, the result implies that a new kind of massive neutrino, with no weak interactions, participates in neutrino oscillations. MiniBooNE searches for {nu}{sub {mu}} {yields} {nu}{sub e} oscillations with the Fermi National Accelerator Laboratory 8 GeV beam line, which produces a {nu}{sub {mu}} beam with an average energy of {approx} 0.8 GeV and an intrinsic {nu}{sub e} content of 0.4%. The neutrino detector is a 6.1 m radius sphere filled with CH{sub 2}, viewed by 1540 photo-multiplier tubes, and located 541 m downstream from the source. This work focuses on the estimation of systematic errors associated with the neutrino flux and neutrino interaction cross section predictions, and in particular, on constraining these uncertainties using in-situ MiniBooNE {nu}{sub {mu}} charged current quasielastic (CCQE) scattering data. A data set with {approx} 100,000 events is identified, with 91% CCQE purity. This data set is used to measure several parameters of the CCQE cross section: the axial mass, the Fermi momentum, the binding energy, and the functional dependence of the axial form factor on four-momentum transfer squared. Constraints on the {nu}{sub {mu}} and {nu}{sub e} fluxes are derived using the {nu}{sub {mu}} CCQE data set. A Monte Carlo study of a combined {nu}{sub {mu}} disappearance and {nu}{sub e} appearance oscillation fit is presented, which improves the {nu}{sub {mu}} {yields} {nu}{sub e} oscillation sensitivity of MiniBooNE with respect to a {nu}{sub e} appearance-only fit by 1.2-1.5{sigma}, depending on the value of {Delta}m{sup 2}.

Monroe, Jocelyn R.; /Columbia U.

2006-07-01

215

Modeling Systematic Error Effects for a Sensitive Storage Ring EDM Polarimeter  

Science.gov (United States)

The Storage Ring EDM Collaboration has obtained a set of measurements detailing the sensitivity of a storage ring polarimeter for deuterons to small geometrical and rate changes. Various schemes, such as the calculation of the cross ratio [1], can cancel effects due to detector acceptance differences and luminosity differences for states of opposite polarization. Such schemes fail at second-order in the errors, becoming sensitive to geometrical changes, polarization magnitude differences between opposite polarization states, and changes to the detector response with changing data rates. An expansion of the polarimeter response in a Taylor series based on small errors about the polarimeter operating point can parametrize such effects, primarily in terms of the logarithmic derivatives of the cross section and analyzing power. A comparison will be made to measurements obtained with the EDDA detector at COSY-J"ulich. [4pt] [1] G.G. Ohlsen and P.W. Keaton, Jr., NIM 109, 41 (1973).

Stephenson, Edward; Imig, Astrid

2009-10-01

216

Search for virtual electron capture in the investigation of the internal bremsstrahlung from the decay of 59Ni  

International Nuclear Information System (INIS)

[en] The internal bremsstrahlung spectrum from the non-unique second-forbidden pure electron capture decay of 59Ni was studied in a limestone low-background chamber using a 20 cm3 Ge(Li) detector, searching for the effects of the virtual electron capture in the spectrum shape of internal bremsstrahlung. Comparing the experimental data with the Cutkosky, Zon-Rapoport and virtual capture theories, the best fit was found for the Zon-Rapoport theory and thus the virtual capture theory is not indispensable to the interpretation of the experiment. Some additional results are also obtained in the present study. Thus, the combination of the nuclear matrix elements lambda has been determined, lambda = 0.028+-0.006, as well as the total disintegration energy Q(59Ni-59Co)=1075.1+-1.3 keV. The existence of a postive ?-branch was proved with an estimated value of 1.5X10-7 for the branching. (Auth.)

1976-01-05

217

A mathematical model to choose effective cutting parameters in electroerosion, EDM  

Directory of Open Access Journals (Sweden)

Full Text Available urpose: Machining by electroerosion is a process of removal of material by fusion, vaporization and erosion, reserved essentially for conductor and semiconductor materials. It can be used to machine metals and alloys, the tempered steels, different type of ceramic alloys, other metallic carbides and even for harder materials such as polycrystalline diamond etc. The aim of this paper is to develop a mathematical model for the effect of cutting parameters on the machining by electro discharge machining used widely in industrial applications.Design/methodology/approach: It is about a study and detail analyzes effect of the cutting conditions in machining by electroerosion of steel 42CD4-42CrMo4 on the surface quality of the parts. The statistical method of the analysis of variance “ANOVA” makes it possible to release the considerable effects of the parameters of cut on the criteria of performance of machining by electroerosion, EDM.Findings: The result of the study shows that the nature of the electrode used and the different grades of the materials machined by Electro Discharge Machining, EDM, influence considerably the volume of the removal of material and the surface quality of the produced parts. However, more the resistivity of the electrode increases, more relative wear of the electrode will be important and more the volume of removal of material decreases.Research limitations/implications: This study needs more experimental results for evaluation of the cutting parameters in detail and introduce in the model developed here.Practical implications: This model developed based on the experimental study gives very simple choice of cutting parameters depending on the materials.Originality/value: A very simple model has been develop here after a comprehensive study and this model contains an experimental design, and application ANOVA analysis as a function of experimental results and allows to obtain a smooth surface and high quality machined pieces and can decrease at cost price of the pieces in the manufacturing engineering.

A. Medfai; M. Boujelbene; E. Bayraktar

2011-01-01

218

Search with the CMS detector for heavy resonances decaying into an electron pair  

CERN Document Server

This note presents the CMS experiment potential to discover heavy resonances decaying into an electron-positron pair, such as Kaluza-Klein excitations of a Z or graviton boson predicted in extra dimension models (the TeV^-1 model and the Randall-Sundrum model), or as neutral heavy Z' boson predicted by Grand Unified Theories. Full and fast simulation and reconstruction are used to investigate these productions, with the pileup condition corresponding to a luminosity equal to 2 times 10^ 33; mathrm cm ^ -2 mathrm s ^ -1 . For an integrated luminosity of 60 fbinv, a 5 sigma discovery limit has been obtained for a mass of 5.9 tevct in the case of Kaluza-Klein excitation Z boson production. For the Randall-Sundrum graviton production, the limit is found for graviton masses of 1.8 tevct with a coupling parameter constant c=0.01 and 4.1 tevct for c=0.1 . For the six Z' models considered here, the 5 sigma discovery limit ranges for masses from 3.6 tevct (rm Z_psi) to 4.6 tevct (rm Z_ALRM).

Clerbaux, Barbara; Collard, Caroline; Miné, Philippe

2006-01-01

219

Search for electron and gamma-ray decay of the ^238fPu fission  

Science.gov (United States)

The reaction ^9Be + ^232Th arrow ^241Pu, at beam energies of 50 and 55 MeV, was used in an attempt to populate states in the second minimum (fission isomer) of ^238Pu via the 3n evaporation channel. Prompt gamma-rays, detected using YRAST Ball and conversion electrons, detected using ICE Ball, were collected in coincidence with delayed fission events measured using elements of the Yale SCARY array of solar cell detectors. The solar cell detectors were shielded so as not to view the large prompt fission flux from the target. Instead the detectors were located so that they could detect delayed fission events, originating from the 6 ns fission isomer state in ^238Pu, which occur downstream from the target position. Data analysis is in progress and results to date will be presented. This work is partly supported by the U.S. DOE under grant numbers DE-FG02-91ER-40609, DE-FG02-88ER-40417.

Beausang, C. W.; Gurdal, G.; Ressler, J.; Barton, C. J.; Caprio, M. A.; Casten, R. F.; Cooper, J. R.; Hecht, A. A.; Hutter, C.; Zamfir, N. V.; Hauschild, K.; Korten, W.; Mergel, E.

2002-04-01

220

Radiation degradation behavior of chlorine-containing vinyl copolymers. Search for improved electron-beam resists  

International Nuclear Information System (INIS)

Vinyl copolymers with high radiation degradation sensitivity have been synthesized by copolymerizing vinylidene chloride (VDC), CH2 = CCl2, with methyl methacrylate (MMA), methacrylonitrile, methyl ?-chloroacrylate, and dimethyl itaconate using emulsion techniques. In addition, copolymers of methyl ?-chloroacrylate with methyl methacrylate and poly(?-chloroacrylonitrile) were studied. Introduction of vinylidene chloride into methyl methacrylate polymers caused a sharp increase in G/sub s/ even at relatively low VDC incorporation. Upon 29% VDC incorporation, the G/sub s/ value increased from 1.3 (homopolymer of MMA) to 3.4. G/sub s/ was found to be a linear function of copolymer content for several systems, but G/sub x/ was not. At higher VDC levels, the increase in G/sub s/ was countered by increases in G/sub x/. At lower VDC levels, G/sub x/ was suppressed below the values predicted by a linear G/sub x/ dependence on composition for such systems as VDC/MMA, MCA/MMA, and ?-chloroacrylonitrile/MMA. The VDC/MMA copolymer (29% VDC) gave a sensitivity of 4.0 x 10-5 C/cm2 to electron beam exposure using the 0% unexposed resist thickness loss criterion and is 2 to 3 times more sensitive than PMMA. Poly(?-chloroacrylonitrile) is a negative resist with a sensitivity of 5 x 10-5 C/cm2 using one-micron line images for testing

1980-01-01

 
 
 
 
221

Search for double electron capture of 106Cd in TGV-2 experiment  

International Nuclear Information System (INIS)

Experiment to seek double electron capture in 106Cd decay took place in the Modane underground laboratory (4800 m depth). By means of the TGV-2 low-background multidetector spectrometer one investigated into thin (? 50 ?m thickness) specimens of enriched 106Cd and of natural Cd. On the basis of the preliminary processing of data acquired in 3400 hour course of efforts to measure 10 g of enriched 106Cd (75% enrichment) one determined new limits (90% confidence limit) for various branches of 106Cd decay into ground (0+) and first excited state (2+, 512 keV) of a daughter nucleus. They constitute T1/2(2??+EC) ? 4.1 x 1019 g and T1//2(2?EC/EC) ? 5.6 x 1019 g (for 0+ ? 0+, g.s. transitions) and T1/2(2??+EC) ? 5.8 x 1019 g and T1/2(2?EC/EC) ? 2.1 x 1019 g

2005-07-01

222

Radiation degradation behavior of chlorine-containing vinyl copolymers. Search for improved electron-beam resists  

Energy Technology Data Exchange (ETDEWEB)

Vinyl copolymers with high radiation degradation sensitivity have been synthesized by copolymerizing vinylidene chloride (VDC), CH/sub 2/ = CCl/sub 2/, with methyl methacrylate (MMA), methacrylonitrile, methyl ..cap alpha..-chloroacrylate, and dimethyl itaconate using emulsion techniques. In addition, copolymers of methyl ..cap alpha..-chloroacrylate with methyl methacrylate and poly(..cap alpha..-chloroacrylonitrile) were studied. Introduction of vinylidene chloride into methyl methacrylate polymers caused a sharp increase in G/sub s/ even at relatively low VDC incorporation. Upon 29% VDC incorporation, the G/sub s/ value increased from 1.3 (homopolymer of MMA) to 3.4. G/sub s/ was found to be a linear function of copolymer content for several systems, but G/sub x/ was not. At higher VDC levels, the increase in G/sub s/ was countered by increases in G/sub x/. At lower VDC levels, G/sub x/ was suppressed below the values predicted by a linear G/sub x/ dependence on composition for such systems as VDC/MMA, MCA/MMA, and ..cap alpha..-chloroacrylonitrile/MMA. The VDC/MMA copolymer (29% VDC) gave a sensitivity of 4.0 x 10/sup -5/ C/cm/sup 2/ to electron beam exposure using the 0% unexposed resist thickness loss criterion and is 2 to 3 times more sensitive than PMMA. Poly(..cap alpha..-chloroacrylonitrile) is a negative resist with a sensitivity of 5 x 10/sup -5/ C/cm/sup 2/ using one-micron line images for testing.

Helbert, J.N. (Army Electronics Tech. and Devices Lab., Fort Monmouth, NJ); Poindexter, E.H.; Pittman, C.U. Jr.; Chen, C.Y.

1980-06-01

223

Search for the sixth quark in hadronic final states of the electron-positron annihilation at PETRA  

International Nuclear Information System (INIS)

[en] Using the MARK-J detector at the PETRA storage ring hadronic final states of the electron-positron annihilation were studied. One aim of these measurements is mainly the search for a further quark, the top quark. The results yield no indications for bound state of the top quark in the energy range between 29.90 and 37.72 GeV. From the analysis of the spatial energy distribution of hadronic final states as well the rate of inclusive muon events also the result is obtained that top quarks are not produced below an energy of W=36.72 GeV. (orig./HSI)[de] Mit dem MARK-J Detektor wurden am Speicherring PETRA hadronische Endzustaende der Elektron-Positron Annihilation untersucht. Ein Ziel unserer Messungen ist es vor allem, nach einem weiteren Quark, dem Top-Quark, zu suchen. Unsere Resultate ergeben keinen Hinweis auf gebundene Zustaende des Top-Quarks im Energiebereich zwischen 29.90 und 36.72 GeV. Aus der Analyse der raeumlichen Energieverteilung hadronischer Endzustaende, sowie der Rate inklusiver Myon-Ereignisse kommt man ebenfalls zu dem Ergebnis, dass Top-Quarks unterhalb einer Energie von W=36.72 GeV nicht produziert werden. (orig./HSI)

1981-01-01

224

Performance of Silver Coated Copper Tool with Kerosene-servotherm Dielectric in EDM of Monel 400TM  

Directory of Open Access Journals (Sweden)

Full Text Available Technologies to improve the material removal rate and reduce the tool removal rate, achieve the good surface finish and dimensional accuracy are very demanding in electrical discharge machining (EDM). The work focused on comparing performance of optimum silver coated copper tool electrode with conventionally used copper tool electrode using optimum proportionate kerosene-servotherm and commercial grade EDM oil in electrical discharge machining of Monel 400TM. The optimum thickness of silver coating over the copper tool electrode and optimum proportionate Kerosene-Servotherm dielectric were developed experimentally. The copper tool electrode with silver coating of five microns reported slightly more material removal rate, very low tool wear rate, better dimensional accuracy and good surface finish than copper tool electrode with Kerosene-Servotherm (75:25) dielectric.

R. Jothimurugan; K.S. Amirthagadeswaran; Joel Daniel

2012-01-01

225

Numerical study on the hydrodynamic behavior of the dielectric fluid around an electrical discharge generated bubble in EDM  

Science.gov (United States)

In the process of EDM, due to the electrical current, very small bubbles are created within the gap. These bubbles are connected to each other and generate a single bubble. The vapor bubble continues to grow until it finally collapses to small bubbles. The bubble behavior can be ascertained on the distribution of the pressure in the dielectric fluid around the bubble. In this paper, velocity fields and pressure distribution in the dielectric fluid around the bubble that is generated in the process of EDM are investigated numerically. The tool and the workpiece are assumed as two parallel rigid boundaries with dielectric liquid between them. The boundary integral equation method is applied for the numerical solution of the problem. This study can lead to better understanding of the bubble importance in the performance of the electrical discharge machining process.

Shervani-Tabar, Mohammad T.; Mobadersany, Nima

2013-09-01

226

Predictive Modelling & Analysis of AISI 1045 Tool Steel in Die Sinking E.D.M. using Neural Network Approach  

Directory of Open Access Journals (Sweden)

Full Text Available Electrical Discharge Machining (EDM) is a non conventional machining process, where electrically conductive materials are machined by using a precisely controlled spark that occurs between an electrode and a work piece in the presence of a dielectric fluid. It has been a demanding research area to model and optimize the EDM process in the present scenario. In this work a neural network model is presented for predictions of material removal rate (MRR) & tool wear rate (TWR) in die sinking electrical discharge machining (EDM) process for American Iron and Steel Institute 1045 tool steel with copper electrode.Experimentation has been carried out on EDM of AISI 1045 tool Steel. The experimental results have been used to train ANN using Back-Propagation Algorithm which gives the optimum value of the performance parameters like Material Removal Rate (MRR) and Tool Wear Rate (TWR) based on the influence of various electrode materials and processing parameters such as Gap Voltage, Peak Current, Pulse on time and Pulse off time. According to the correlation coefficients diagram it was concluded that the ANN tool gives us the best possible predictions for the data we have trained.Also we are getting ANN MRR results very much closer to our experimental MRR values.This shows the values that are very much possible to correlate amongst one another apart from taking experiments and finally the values of experimental TWR and predicted TWR are nearly correlating with one another.This shows that the ANN can be trained enough to give us close results by predicting the values.

Samaddar Prasenjeet 1 , B. B. Patel 2 , K. B. Rathod

2013-01-01

227

High aspect ratio micro tool manufacturing for polymer replication using mu EDM of silicon, selective etching and electroforming  

DEFF Research Database (Denmark)

Mass fabrication of polymer micro components with high aspect ratio micro-structures requires high performance micro tools allowing the use of low cost replication processes such as micro injection moulding. In this regard an innovative process chain, based on a combination of micro electrical discharge machining (mu EDM) of a silicon substrate, electroforming and selective etching was used for the manufacturing of a micro tool. The micro tool was employed for polymer replication by means of the injection moulding process.

Tosello, Guido; Bissacco, Giuliano

2008-01-01

228

Optimization of Electrical and Non Electrical Factors in EDM for Machining Die Steel Using Copper Electrode by Adopting Taguchi Technique  

Directory of Open Access Journals (Sweden)

Full Text Available EDM machining is used for very hard and complex cutting of conducting materials with higher surface finish and close dimensions. EDM process parameters are affected by both electrical and non electrical parameters. In these paper cutting of hard material high carbon high chromium (HCHcr) D3 steel is done on electro discharge machine with copper as cutting tool electrode. This paper presents a work on the performance parameter optimization for material removal rate (MRR) and electrode wear rate (EWR). There are electrical and non electrical factors which influences MRR and EWR such as voltage ,current pulse on time , pulse off time , dielectric fluid material , flushing pressure, tool rotation etc. In theses paper both the electrical factors and non electrical factors has been focused which governs MRR, EWR and there optimization. Paper is based on Design of experiment and optimization of EDM process parameters .The technique used is Taguchi technique which is a statistical decision making tool helps in minimizing the number of experiments and the error associated with it. The research showed that the peak current has significant effect on material removal rate.

Ajeet Bergaley; Narendra Sharma

2013-01-01

229

Optimization of control parameters for SR in EDM injection flushing type on stainless steel 304 workpiece  

International Nuclear Information System (INIS)

The operating control parameters of injection flushing type of electrical discharge machining process on stainless steel 304 workpiece with copper tools are being optimized according to its individual machining characteristic i.e. surface roughness (SR). Higher SR during EDM machining process results for poor surface integrity of the workpiece. Hence, the quality characteristic for SR is set to lower-the-better to achieve the optimum surface integrity. Taguchi method has been used for the construction, layout and analysis of the experiment for each of the machining characteristic for the SR. The use of Taguchi method in the experiment saves a lot of time and cost of machining the experiment samples. Therefore, an L18 Orthogonal array which was the fundamental component in the statistical design of experiments has been used to plan the experiments and Analysis of Variance (ANOVA) is used to determine the optimum machining parameters for this machining characteristic. The control parameters selected for this optimization experiments are polarity, pulse on duration, discharge current, discharge voltage, machining depth, machining diameter and dielectric liquid pressure. The result had shown that the lower the machining diameter, the lower will be the SR.

2012-09-18

230

Measurement of Systematic Error Effects for a Sensitive Storage Ring EDM Polarimeter  

Science.gov (United States)

The Storage Ring EDM Collaboration was using the Cooler Synchrotron (COSY) and the EDDA detector at the Forschungszentrum J"ulich to explore systematic errors in very sensitive storage-ring polarization measurements. Polarized deuterons of 235 MeV were used. The analyzer target was a block of 17 mm thick carbon placed close to the beam so that white noise applied to upstream electrostatic plates increases the vertical phase space of the beam, allowing deuterons to strike the front face of the block. For a detector acceptance that covers laboratory angles larger than 9 ^o, the efficiency for particles to scatter into the polarimeter detectors was about 0.1% (all directions) and the vector analyzing power was about 0.2. Measurements were made of the sensitivity of the polarization measurement to beam position and angle. Both vector and tensor asymmetries were measured using beams with both vector and tensor polarization. Effects were seen that depend upon both the beam geometry and the data rate in the detectors.

Imig, Astrid; Stephenson, Edward

2009-10-01

231

Pengaruh Arc On dan Arc Off Time Terhadap Kekasaran Permukaan dan Laju Pembuangan Geram Hasil Pemesinan Sinking EDM  

Directory of Open Access Journals (Sweden)

Full Text Available Sinking type electro discharge machine (EDM) is the nwst popular non conventional machining method in the current decade based on modern CNC controlled. Although the EDM process has been used for decades, it is still widely misunderstood by many in manufacturing. The EDM is used when the work piece material is too hard, or the shape or location of the detail cannot easily be conventionally machined e.g. high precision mold and die with high surface quality. The performance of this process can be indicated by productivity and quality of product to be machined. An experiment to study the effect of machining parameter on productivity and surface quality has been done by varying the most important parameter arc on and arc off time. For this experiment a Charme Pulse CD-50M type sinking EDM machine is used to perform the machining process of tool steel SKD 11 material (55- 65 HRC) with an copper electrode and esso lector 40 of dielectric fluid that having a density of 6.8 gr / cm3 and 1320C burning temperature for jet side flushing. The constant parameters are current 8 Ampere, voltage 40 volt and depth of machining 0.5 mm. The experimental data is analyzed by statistically program and the result are empirical formulas of the average roughness Ra = 0.624. A0.4. B-0.01 and the metal removal rate MRR = 0.2. A0.25.B0.53%2C where A is arc on time and B is arc off time. Abstract in Bahasa Indonesia : Electrical Discharge Machine (EDM) sinking merupakan salah satu proses permesinan non konvensional yang berbasis komputer sebagai pengendali utamanya. Dimana EDM shinking digunakan untuk membuat rongga cetakan yang memiliki kontur yang kompleks dan kepresisian yang tinggi. Salah satu produk yang sering dikerjakaan oleh mesin EDM adalah dies dan mould yang memiliki kekerasan yang tinggi. Peranan dies dan mould pada proses manufaktur seperti deep drawing, forging, pengecoran dan lain-lain sangatlah berpengaruh terutama pada kualitas ketepatan dimensi, kepresisian dan kekasaran permukaan dies. Untuk meningkatkan produktivitas dan kualitas hasil produk sesuai dengan yang diharapkan maka pengetahuan paramater selama proses permesinan EDM haruslah baik. Suatu eksperimen yang bertujuan untuk mempelajari pengaruh arc on time dan arc off time terhadap kekasaran permukaan produk dilakukan untuk mengetahui karakteristik mesin EDM sinking. Eksperimen akan dilakukan pada mesin EDM sinking jenis Charme Pulse CD-50M dan benda kerja plat baja SKD 11 dengan kekerasan 55 s/d 61 HRC yang sering digunakan sebagai bahan dies, elektrode yang digunakan tembaga dan fluida dielectric adalah esso lector 40 dengan density 6,8 gr/cm3 pada temperature burning 132oC. Dalam pengujian ini analisa statistiknya untuk variable bebas adalah arc on time, arc of time. Adapun varible terikat (repon) adalah kekasaran permukaan dan MRR (metal removal rate). Parameter pengujian yang konstan adalah arus listrik 8 ampere, voltase 40 volt, kedalaman pemotongan 0.5 mm, metode jet/side flushing dan untuk parameter pengujian yang tidak konstan adalah pulse on time, pulse of time dan waktu eksekusi tiap titik. Data yang diperoleh dianalisa statistik dengan software Minitab untuk mendapatkan persamaan empiris hubungan antara arc time dan arc off time terhadap kekasaran permukaan. Hasil dari pengujian ini didapatkan bahwa untuk off time konstan dan on time yang semakin naik didapatkan nilai kekasaran permukaan semakin besar dan nilai MRR semakin naik, untuk untuk on time yang konstan serta off time yang semakin naik didapatkan nilai kekasaran permukaan yang relatif konstan dan harga MRR semakin turun. Adapaun persamaan empiris yang didapatkan pada software minitab adalah: - Kekasaran Permukaan (Ra) = 0.624.A0.4.B-0.01 - Metal Removal Rate (MRR) = 0.2. A0.25.B-0.53 dimana A (arc on time), B (arc off time) Kata kunci : Arc on time, arc off time, kekasaran permukaan, metal removal rate (MRR), EDM Sinking.

Suhardjono Suhardjono

2004-01-01

232

Second User Acceptance Test of the Electronic Document Management System  

Canada Institute for Scientific and Technical Information (Canada)

The overall evaluation objective was to determine whether the Electronic Document Management (EDM) system can satisfactorily execute vendor payment workflows while providing adequate security for system and production data. Specifically, we determined whether system performance and control deficiencies identified during the first user acceptance test were corrected.

1997-01-01

233

Search for resonant electron transfer and double excitation in Kr(sup 34+) + H(sub 2) collisions.  

Science.gov (United States)

Resonant electron transfer and double excitation (RME) is a correlated electron process which is expected to occur in an ion-atom collision when electron capture is accompanied by the simultaneous excitation of two inner-shell electrons. RT2 is similar to...

K. E. Zaharakis R. R. Haar J. A. Tanis M. W. Clark V. L. Plano

1992-01-01

234

Search for excited electrons and muons in \\sqrt {s}=8 TeV proton-proton collisions with the ATLAS detector  

Science.gov (United States)

The ATLAS detector at the Large Hadron Collider is used to search for excited electrons and excited muons in the channel pp ? ??* ? ???, assuming that excited leptons are produced via contact interactions. The analysis is based on 13 fb-1 of pp collisions at a centre-of-mass energy of 8 TeV. No evidence for excited leptons is found, and a limit is set at the 95% credibility level on the cross section times branching ratio as a function of the excited-lepton mass m?*. For m?* ? 0.8 TeV, the respective upper limits on ?B(?* ? ??) are 0.75 and 0.90 fb for the e* and ?* searches. Limits on ?B are converted into lower bounds on the compositeness scale ?. In the special case where ? = m?*, excited-electron and excited-muon masses below 2.2 TeV are excluded.

Aad, G.; Abajyan, T.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdinov, O.; Aben, R.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Adomeit, S.; Adye, T.; Aefsky, S.; Agatonovic-Jovin, T.; Aguilar-Saavedra, J. A.; Agustoni, M.; Ahlen, S. P.; Ahmad, A.; Ahmadov, F.; Ahsan, M.; Aielli, G.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Alam, M. A.; Albert, J.; Albrand, S.; Alconada Verzini, M. J.; Aleksa, M.; Aleksandrov, I. N.; Alessandria, F.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Aliev, M.; Alimonti, G.; Alio, L.; Alison, J.; Allbrooke, B. M. M.; Allison, L. J.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alonso, F.; Altheimer, A.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amaral Coutinho, Y.; Amelung, C.; Ammosov, V. V.; Amor Dos Santos, S. P.; Amorim, A.; Amoroso, S.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Anduaga, X. S.; Angelidakis, S.; Anger, P.; Angerami, A.; Anghinolfi, F.; Anisenkov, A. V.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoki, M.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J.-F.; Argyropoulos, S.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Arslan, O.; Artamonov, A.; Artoni, G.; Asai, S.; Asbah, N.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astalos, R.; Astbury, A.; Atkinson, M.; Atlay, N. B.; Auerbach, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Axen, D.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Backus Mayes, J.; Badescu, E.; Bagiacchi, P.; Bagnaia, P.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, S.; Balek, P.; Balli, F.; Banas, E.; Banerjee, Sw; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barber, T.; Barberio, E. L.; Barberis, D.; Barbero, M.; Bardin, D. Y.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Bartoldus, R.; Barton, A. E.; Bartsch, V.; Bassalat, A.; Basye, A.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, K.; Becker, S.; Beckingham, M.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Beermann, T. A.; Begel, M.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellerive, A.; Bellomo, M.; Belloni, A.; Beloborodova, O. L.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Berglund, E.; Beringer, J.; Bernard, C.; Bernat, P.; Bernhard, R.; Bernius, C.; Bernlochner, F. U.; Berry, T.; Berta, P.; Bertella, C.; Bertolucci, F.; Besana, M. I.; Besjes, G. J.; Bessidskaia, O.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianchini, L.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilbao De Mendizabal, J.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Bittner, B.; Black, C. W.; Black, J. E.; Black, K. M.; Blackburn, D.; Blair, R. E.; Blanchard, J.-B.; Blazek, T.; Bloch, I.; Blocker, C.; Blocki, J.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. S.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boek, T. T.; Boelaert, N.; Bogaerts, J. A.; Bogdanchikov, A. G.; Bogouch, A.; Bohm, C.; Bohm, J.; Boisvert, V.; Bold, T.; Boldea, V.; Boldyrev, A. S.; Bolnet, N. M.; Bomben, M.; Bona, M.; Boonekamp, M.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borri, M.; Borroni, S.; Bortfeldt, J.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boutouil, S.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozovic-Jelisavcic, I.; Bracinik, J.; Branchini, P.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brazzale, S. F.; Brelier, B.; Brendlinger, K.; Brenner, R.; Bressler, S.; Bristow, T. M.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, T.; Brooks, W. K.; Brost, E.; Brown, G.; Brown, J.

2013-09-01

235

Energies, transition rates, and electron electric-dipole-moment enhancement factors for Ce IV and Pr V  

International Nuclear Information System (INIS)

Energies, transition rates, and electron electric-dipole-moment (EDM) enhancement factors are calculated for low-lying states of Ce IV and Pr V using relativistic many-body perturbation theory. This study is related to recent investigations of the more complicated Gd IV ion, which is promising for electron EDM experiments. The ions Ce IV and Pr V both have a single valence electron, permitting one to carry out reliable ab initio calculations of energy levels, transition rates, and other atomic properties using well-developed computational methods.

2003-01-01

236

The behavior of graphite and copper electrodes on the finish die-sinking electrical discharge machining (EDM) of AISI P20 tool steel  

Directory of Open Access Journals (Sweden)

Full Text Available The machining parameter settings installed at CNC EDM machines are developed under optimum process conditions. Standard workpiece and electrode materials are used traditionally by machine manufacturers to establish the EDM parameter settings. However, this is not the usual situation of the tooling industry, where many different grades of workpiece and tool electrode materials are used. Consequently, the customers are required to develop their own process parameters, which normally demand many experimental tests. According to the aforementioned argument an experimental investigation on the EDM of AISI P20 tool steel under finish machining has been carried out. The tests were performed with graphite and copper as tool electrodes. Important EDM electrical parameters that influence the process performance were investigated. The measured technological outputs were the material removal rate Vw, volumetric relative wear J and workpiece surface finish Ra . The main conclusions can be summarized as follows: the best results for material removal rate Vw were reached when EDM with negative graphite electrodes. Graphite and copper tools presented similar results of Vw for positive polarity. For graphite and copper tools the lowest values of volumetric relative wear were achieved for positive polarity. The best surface roughness Ra was obtained for copper electrodes under negative polarity.

Fred L. Amorim; Walter L. Weingaertner

2007-01-01

237

The behavior of graphite and copper electrodes on the finish die-sinking electrical discharge machining (EDM) of AISI P20 tool steel  

Scientific Electronic Library Online (English)

Full Text Available Abstract in english The machining parameter settings installed at CNC EDM machines are developed under optimum process conditions. Standard workpiece and electrode materials are used traditionally by machine manufacturers to establish the EDM parameter settings. However, this is not the usual situation of the tooling industry, where many different grades of workpiece and tool electrode materials are used. Consequently, the customers are required to develop their own process parameters, which (more) normally demand many experimental tests. According to the aforementioned argument an experimental investigation on the EDM of AISI P20 tool steel under finish machining has been carried out. The tests were performed with graphite and copper as tool electrodes. Important EDM electrical parameters that influence the process performance were investigated. The measured technological outputs were the material removal rate Vw, volumetric relative wear J and workpiece surface finish Ra . The main conclusions can be summarized as follows: the best results for material removal rate Vw were reached when EDM with negative graphite electrodes. Graphite and copper tools presented similar results of Vw for positive polarity. For graphite and copper tools the lowest values of volumetric relative wear were achieved for positive polarity. The best surface roughness Ra was obtained for copper electrodes under negative polarity.

Amorim, Fred L.; Weingaertner, Walter L.

2007-12-01

238

Electronic search strategies to identify reports of cluster randomized trials in MEDLINE: low precision will improve with adherence to reporting standards  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background Cluster randomized trials (CRTs) present unique methodological and ethical challenges. Researchers conducting systematic reviews of CRTs (e.g., addressing methodological or ethical issues) require efficient electronic search strategies (filters or hedges) to identify trials in electronic databases such as MEDLINE. According to the CONSORT statement extension to CRTs, the clustered design should be clearly identified in titles or abstracts; however, variability in terminology may make electronic identification challenging. Our objectives were to (a) evaluate sensitivity ("recall") and precision of a well-known electronic search strategy ("randomized controlled trial" as publication type) with respect to identifying CRTs, (b) evaluate the feasibility of new search strategies targeted specifically at CRTs, and (c) determine whether CRTs are appropriately identified in titles or abstracts of reports and whether there has been improvement over time. Methods We manually examined a wide range of health journals to identify a gold standard set of CRTs. Search strategies were evaluated against the gold standard set, as well as an independent set of CRTs included in previous systematic reviews. Results The existing strategy (randomized controlled trial.pt) is sensitive (93.8%) for identifying CRTs, but has relatively low precision (9%, number needed to read 11); the number needed to read can be halved to 5 (precision 18.4%) by combining with cluster design-related terms using the Boolean operator AND; combining with the Boolean operator OR maximizes sensitivity (99.4%) but would require 28.6 citations read to identify one CRT. Only about 50% of CRTs are clearly identified as cluster randomized in titles or abstracts; approximately 25% can be identified based on the reported units of randomization but are not amenable to electronic searching; the remaining 25% cannot be identified except through manual inspection of the full-text article. The proportion of trials clearly identified has increased from 28% between the years 2000-2003, to 60% between 2004-2007 (absolute increase 32%, 95% CI 17 to 47%). Conclusions CRTs should include the phrase "cluster randomized trial" in titles or abstracts; this will facilitate more accurate indexing of the publication type by reviewers at the National Library of Medicine, and efficient textword retrieval of the subset employing cluster randomization.

Taljaard Monica; McGowan Jessie; Grimshaw Jeremy M; Brehaut Jamie C; McRae Andrew; Eccles Martin P; Donner Allan

2010-01-01

239

Search for WW and WZ Resonances Decaying to Electron, Missing E[subscript T], and Two Jets in pp[over-bar] Collisions at [sqrt]s=1.96??TeV. Search for WW and WZ Resonances Decaying to Electron, Missing ET, and Two Jets in pp? Collisions at ?s=1.96??TeV.  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Using data from 2.9??fb[superscript -1] of integrated luminosity collected with the CDF II detector at the Tevatron, we search for resonances decaying into a pair of on-shell gauge bosons, WW or WZ, where one W decays into an electron and a neutrino, and the other boson decays into two jets. We obse...

Paus, Christoph M. E.; Bauer, Gerry P.; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Makhoul, K.

240

Search for excited and exotic electrons in the egamma decay channel in pp collisions at sqrt[s] = 1.96 TeV.  

UK PubMed Central (United Kingdom)

We present a search for excited and exotic electrons (e(*)) decaying to an electron and a photon, both with high transverse momentum. We use 202 pb(-1) of data collected in pp collisions at sqrt[s] = 1.96 TeV with the Collider Detector at Fermilab II detector. No signal above standard model expectation is seen for associated ee(*) production. We discuss the e(*) sensitivity in the parameter space of the excited electron mass M(e(*)) and the compositeness energy scale Lambda. In the contact interaction model, we exclude 132 GeV/c(2)

Acosta D; Adelman J; Affolder T; Akimoto T; Albrow MG; Ambrose D; Amerio S; Amidei D; Anastassov A; Anikeev K; Annovi A; Antos J; Aoki M; Apollinari G; Arisawa T; Arguin JF; Artikov A; Ashmanskas W; Attal A; Azfar F; Azzi-Bacchetta P; Bacchetta N; Bachacou H; Badgett W; Barbaro-Galtieri A; Barker GJ; Barnes VE; Barnett BA; Baroiant S; Barone M; Bauer G; Bedeschi F; Behari S; Belforte S; Bellettini G; Bellinger J; Ben-Haim E; Benjamin D; Beretvas A; Bhatti A; Binkley M; Bisello D; Bishai M; Blair RE; Blocker C; Bloom K; Blumenfeld B; Bocci A; Bodek A; Bolla G; Bolshov A; Booth PS; Bortoletto D; Boudreau J; Bourov S; Bromberg C; Brubaker E; Budagov J; Budd HS; Burkett K; Busetto G; Bussey P; Byrum KL; Cabrera S; Campanelli M; Campbell M; Canepa A; Casarsa M; Carlsmith D; Carron S; Carosi R; Cavalli-Sforza M; Castro A; Catastini P; Cauz D; Cerri A; Cerri C; Cerrito L; Chapman J; Chen C; Chen YC; Chertok M; Chiarelli G; Chlachidze G; Chlebana F; Cho I; Cho K; Chokheli D; Chu ML; Chuang S; Chung JY; Chung WH; Chung YS; Ciobanu CI; Ciocci MA; Clark AG; Clark D; Coca M; Connolly A; Convery M; Conway J; Cooper B; Cordelli M; Cortiana G; Cranshaw J; Cuevas J; Culbertson R; Currat C; Cyr D; Dagenhart D; Da Ronco S; D'Auria S; de Barbaro P; De Cecco S; De Lentdecker G; Dell'Agnello S; Dell'Orso M; Demers S; Demortier L; Deninno M; De Pedis D; Derwent PF; Dionisi C; Dittmann JR; Doksus P; Dominguez A; Donati S; Donega M; Donini J; D'Onofrio M; Dorigo T; Drollinger V; Ebina K; Eddy N; Ely R; Erbacher R; Erdmann M; Errede D; Errede S; Eusebi R; Fang HC; Farrington S; Fedorko I; Feild RG; Feindt M; Fernandez JP; Ferretti C; Field RD; Fiori I; Flanagan G; Flaugher B; Flores-Castillo LR; Foland A; Forrester S; Foster GW; Franklin M; Freeman JC; Frisch H; Fujii Y; Furic I; Gajjar A; Gallas A; Galyardt J; Gallinaro M; Garfinkel AF; Gay C; Gerberich H; Gerdes DW; Gerchtein E; Giagu S; Giannetti P; Gibson A; Gibson K; Ginsburg C; Giolo K; Giordani M; Giurgiu G; Glagolev V; Glenzinski D; Gold M; Goldschmidt N; Goldstein D; Goldstein J; Gomez G; Gomez-Ceballos G; Goncharov M; González O; Gorelov I; Goshaw AT; Gotra Y; Goulianos K; Gresele A; Griffiths M; Grosso-Pilcher C; Grundler U; Guenther M; da Costa JG; Haber C; Hahn K; Hahn SR; Halkiadakis E; Hamilton A; Han BY; Handler R; Happacher F; Hara K; Hare M; Harr RF; Harris RM; Hartmann F; Hatakeyama K; Hauser J; Hays C; Hayward H; Heider E; Heinemann B; Heinrich J; Hennecke M; Herndon M; Hill C; Hirschbuehl D; Hocker A; Hoffman KD; Holloway A; Hou S; Houlden MA; Huffman BT; Huang Y; Hughes RE; Huston J; Ikado K; Incandela J; Introzzi G; Iori M; Ishizawa Y; Issever C; Ivanov A; Iwata Y; Iyutin B; James E; Jang D; Jarrell J; Jeans D; Jensen H; Jeon EJ; Jones M; Joo KK; Jun S; Junk T; Kamon T; Kang J; Karagoz Unel M; Karchin PE; Kartal S; Kato Y; Kemp Y; Kephart R; Kerzel U; Khotilovich V; Kilminster B; Kim DH; Kim HS; Kim JE; Kim MJ; Kim MS; Kim SB; Kim SH; Kim TH; Kim YK; King BT; Kirby M; Kirsch L; Klimenko S; Knuteson B; Ko BR; Kobayashi H; Koehn P; Kong DJ; Kondo K; Konigsberg J; Kordas K; Korn A; Korytov A; Kotelnikov K; Kotwal AV; Kovalev A; Kraus J; Kravchenko I; Kreymer A; Kroll J; Kruse M; Krutelyov V; Kuhlmann SE; Kuznetsova N; Laasanen AT; Lai S; Lami S; Lammel S; Lancaster J; Lancaster M; Lander R; Lannon K; Lath A; Latino G; Lauhakangas R; Lazzizzera I; Le Y; Lecci C; Lecompte T; Lee J; Lee J; Lee SW; Lefevre R; Leonardo N; Leone S; Lewis JD; Li K; Lin C; Lin CS; Lindgren M; Liss TM; Litvintsev DO; Liu T; Liu Y; Lockyer NS; Loginov A; Loreti M; Loverre P; Lu RS; Lucchesi D; Lujan P; Lukens P; Lungu G; Lyons L; Lys J; Lysak R; Macqueen D; Madrak R; Maeshima K; Maksimovic P; Malferrari L; Manca G; Marginean R; Martin M; Martin A; Martin V; Martínez M; Maruyama T; Matsunaga H; Mattson M; Mazzanti P; McFarland KS; McGivern D; McIntyre PM; McNamara P; NcNulty R; Menzemer S; Menzione A; Merkel P; Mesropian C; Messina A; Miao T; Miladinovic N; Miller L; Miller R; Miller JS; Miquel R; Miscetti S; Mitselmakher G; Miyamoto A; Miyazaki Y; Moggi N; Mohr B; Moore R; Morello M; Mukherjee A; Mulhearn M; Muller T; Mumford R; Munar A; Murat P; Nachtman J; Nahn S; Nakamura I; Nakano I; Napier A; Napora R; Naumov D; Necula V; Niell F; Nielsen J; Nelson C; Nelson T; Neu C; Neubauer MS; Newman-Holmes C; Nicollerat AS; Nigmanov T; Nodulman L; Norniella O; Oesterberg K; Ogawa T; Oh SH; Oh YD; Ohsugi T; Okusawa T; Oldeman R; Orava R; Orejudos W; Pagliarone C; Palencia E; Palmonari F; Paoletti R; Papadimitriou V; Pashapour S; Patrick J; Pauletta G; Paulini M; Pauly T; Paus C; Pellett D; Penzo A; Phillips TJ; Piacentino G; Piedra J; Pitts KT; Plager C; Pompos A; Pondrom L; Pope G; Poukhov O; Prakoshyn F; Pratt T; Pronko A; Proudfoot J; Ptohos F; Punzi G; Rademacker J; Rakitine A; Rappoccio S; Ratnikov F; Ray H; Reichold A; Reisert B; Rekovic V; Renton P; Rescigno M; Rimondi F; Rinnert K; Ristori L; Robertson WJ; Robson A; Rodrigo T; Rolli S; Rosenson L; Roser R; Rossin R; Rott C; Russ J; Ruiz A; Ryan D

2005-03-01

 
 
 
 
241

Search for resonant electron transfer and double excitation in Kr{sup 34+} + H{sub 2} collisions  

Energy Technology Data Exchange (ETDEWEB)

Resonant electron transfer and double excitation (RME) is a correlated electron process which is expected to occur in an ion-atom collision when electron capture is accompanied by the simultaneous excitation of two inner-shell electrons. RT2 is similar to resonant transfer excitation (RTE) in which only a single electron is excited. RT2E was investigated experimentally for 38--42 MeV/u Kr{sup 34} + H{sub 2} collisions by observing x-ray emission associated with single-electron capture. No events associated with Kr K x rays (near 13 keV were observed; however, events do occur at about twice (> 22 keV) the Kr K x-ray energy. Several possible sources of these latter x rays have been considered.

Zaharakis, K.E.; Haar, R.R.; Tanis, J.A. [Western Michigan Univ., Kalamazoo, MI (United States); Clark, M.W. [Lawrence Livermore National Lab., CA (United States); Plano, V.L. [Michigan State Univ., East Lansing, MI (United States)

1992-12-31

242

Search for Heavy Bottomlike Quarks Decaying to an Electron or Muon and Jets in pp¯ Collisions at s=1.96TeV  

Science.gov (United States)

We report the most sensitive direct search for pair production of fourth-generation bottomlike chiral quarks (b') each decaying promptly to tW. We search for an excess of events with an electron or muon, at least five jets (one identified as due to a b or c quark), and an imbalance of transverse momentum by using data from pp¯ collisions collected by the CDF II detector at Fermilab with an integrated luminosity of 4.8fb-1. We observe events consistent with background expectation, calculate upper limits on the b' pair-production cross section (?bb¯'?30fb for mb'>375GeV/c2), and exclude mb'<372GeV/c2 at 95% confidence level assuming a 100% branching ratio of b' to tW.

Aaltonen, T.; Álvarez González, B.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos, J.; Apollinari, G.; Appel, J. A.; Apresyan, A.; Arisawa, T.; Artikov, A.; Asaadi, J.; Ashmanskas, W.; Auerbach, B.; Aurisano, A.; Azfar, F.; Badgett, W.; Barbaro-Galtieri, A.; Barnes, V. E.; Barnett, B. A.; Barria, P.; Bartos, P.; Bauce, M.; Bauer, G.; Bedeschi, F.; Beecher, D.; Behari, S.; Bellettini, G.; Bellinger, J.; Benjamin, D.; Beretvas, A.; Bhatti, A.; Binkley, M.; Bisello, D.; Bizjak, I.; Bland, K. R.; Blumenfeld, B.; Bocci, A.; Bodek, A.; Bortoletto, D.; Boudreau, J.; Boveia, A.; Brau, B.; Brigliadori, L.; Brisuda, A.; Bromberg, C.; Brucken, E.; Bucciantonio, M.; Budagov, J.; Budd, H. S.; Budd, S.; Burkett, K.; Busetto, G.; Bussey, P.; Buzatu, A.; Calancha, C.; Camarda, S.; Campanelli, M.; Campbell, M.; Canelli, F.; Canepa, A.; Carls, B.; Carlsmith, D.; Carosi, R.; Carrillo, S.; Carron, S.; Casal, B.; Casarsa, M.; Castro, A.; Catastini, P.; Cauz, D.; Cavaliere, V.; Cavalli-Sforza, M.; Cerri, A.; Cerrito, L.; Chen, Y. C.; Chertok, M.; Chiarelli, G.; Chlachidze, G.; Chlebana, F.; Cho, K.; Chokheli, D.; Chou, J. P.; Chung, W. H.; Chung, Y. S.; Ciobanu, C. I.; Ciocci, M. A.; Clark, A.; Compostella, G.; Convery, M. E.; Conway, J.; Corbo, M.; Cordelli, M.; Cox, C. A.; Cox, D. J.; Crescioli, F.; Cuenca Almenar, C.; Cuevas, J.; Culbertson, R.; Dagenhart, D.; D'Ascenzo, N.; Datta, M.; de Barbaro, P.; de Cecco, S.; de Lorenzo, G.; Dell'Orso, M.; Deluca, C.; Demortier, L.; Deng, J.; Deninno, M.; Devoto, F.; D'Errico, M.; di Canto, A.; di Ruzza, B.; Dittmann, J. R.; D'Onofrio, M.; Donati, S.; Dong, P.; Dorigo, M.; Dorigo, T.; Ebina, K.; Elagin, A.; Eppig, A.; Erbacher, R.; Errede, D.; Errede, S.; Ershaidat, N.; Eusebi, R.; Fang, H. C.; Farrington, S.; Feindt, M.; Fernandez, J. P.; Ferrazza, C.; Field, R.; Flanagan, G.; Forrest, R.; Frank, M. J.; Franklin, M.; Freeman, J. C.; Funakoshi, Y.; Furic, I.; Gallinaro, M.; Galyardt, J.; Garcia, J. E.; Garfinkel, A. F.; Garosi, P.; Gerberich, H.; Gerchtein, E.; Giagu, S.; Giakoumopoulou, V.; Giannetti, P.; Gibson, K.; Ginsburg, C. M.; Giokaris, N.; Giromini, P.; Giunta, M.; Giurgiu, G.; Glagolev, V.; Glenzinski, D.; Gold, M.; Goldin, D.; Goldschmidt, N.; Golossanov, A.; Gomez, G.; Gomez-Ceballos, G.; Goncharov, M.; González, O.; Gorelov, I.; Goshaw, A. T.; Goulianos, K.; Gresele, A.; Grinstein, S.; Grosso-Pilcher, C.; Group, R. C.; Guimaraes da Costa, J.; Gunay-Unalan, Z.; Haber, C.; Hahn, S. R.; Halkiadakis, E.; Hamaguchi, A.; Han, J. Y.; Happacher, F.; Hara, K.; Hare, D.; Hare, M.; Harr, R. F.; Hatakeyama, K.; Hays, C.; Heck, M.; Heinrich, J.; Herndon, M.; Hewamanage, S.; Hidas, D.; Hocker, A.; Hopkins, W.; Horn, D.; Hou, S.; Hughes, R. E.; Hurwitz, M.; Husemann, U.; Hussain, N.; Hussein, M.; Huston, J.; Introzzi, G.; Iori, M.; Ivanov, A.; James, E.; Jang, D.; Jayatilaka, B.; Jeon, E. J.; Jha, M. K.; Jindariani, S.; Johnson, W.; Jones, M.; Joo, K. K.; Jun, S. Y.; Junk, T. R.; Kamon, T.; Karchin, P. E.; Kato, Y.; Ketchum, W.; Keung, J.; Khotilovich, V.; Kilminster, B.; Kim, D. H.; Kim, H. S.; Kim, H. W.; Kim, J. E.; Kim, M. J.; Kim, S. B.; Kim, S. H.; Kim, Y. K.; Kimura, N.; Kirby, M.; Klimenko, S.; Kondo, K.; Kong, D. J.; Konigsberg, J.; Kotwal, A. V.; Kreps, M.; Kroll, J.; Krop, D.; Krumnack, N.; Kruse, M.; Krutelyov, V.; Kuhr, T.; Kurata, M.; Kwang, S.; Laasanen, A. T.; Lami, S.; Lammel, S.; Lancaster, M.; Lander, R. L.; Lannon, K.; Lath, A.; Latino, G.; Lazzizzera, I.; Lecompte, T.; Lee, E.; Lee, H. S.; Lee, J. S.; Lee, S. W.; Leo, S.; Leone, S.; Lewis, J. D.; Lin, C.-J.; Linacre, J.; Lindgren, M.; Lipeles, E.; Lister, A.; Litvintsev, D. O.; Liu, C.; Liu, Q.; Liu, T.; Lockwitz, S.; Lockyer, N. S.; Loginov, A.; Lucchesi, D.; Lueck, J.; Lujan, P.; Lukens, P.; Lungu, G.; Lys, J.; Lysak, R.; Madrak, R.; Maeshima, K.; Makhoul, K.; Maksimovic, P.; Malik, S.; Manca, G.; Manousakis-Katsikakis, A.; Margaroli, F.; Marino, C.; Martínez, M.; Martínez-Ballarín, R.; Mastrandrea, P.; Mathis, M.; Mattson, M. E.; Mazzanti, P.; McFarland, K. S.; McIntyre, P.; McNulty, R.; Mehta, A.; Mehtala, P.; Menzione, A.; Mesropian, C.; Miao, T.; Mietlicki, D.; Mitra, A.; Miyake, H.; Moed, S.; Moggi, N.; Mondragon, M. N.; Moon, C. S.; Moore, R.; Morello, M. J.; Morlock, J.; Movilla Fernandez, P.; Mukherjee, A.; Muller, Th.; Murat, P.; Mussini, M.; Nachtman, J.; Nagai, Y.; Naganoma, J.; Nakano, I.; Napier, A.; Nett, J.; Neu, C.; Neubauer, M. S.; Nielsen, J.; Nodulman, L.; Norniella, O.; Nurse, E.; Oakes, L.; Oh, S. H.; Oh, Y. D.; Oksuzian, I.; Okusawa, T.; Orava, R.; Ortolan, L.; Pagan Griso, S.; Pagliarone, C.; Palencia, E.; Papadimitriou, V.; Paramonov, A. A.; Patrick, J.; Pauletta, G.; Paulini, M.; Paus, C.; Pellett, D. E.; Penzo, A.; Phillips, T. J.; Piacentino, G.; Pianori, E.; Pilot, J.; Pitts, K.

2011-04-01

243

An ionization chamber for coincidence experiments in a search for double beta positron decay and electron positron conversion of 78Kr  

International Nuclear Information System (INIS)

A search for double positron decay and electron capture with positron emission in the transition 78Kr(0+gs)?78Se(0+gs) has been carried out by using a high pressure ionization chamber surrounded by a set of NaI detectors. Coincidences between the emitted positron(s) and the two (four) consequent annihilation gammas have been looked for as signature(s) of the process(es). The ionization chamber of krypton gas (enriched up to 94.08% in the 78 isotope) registers the positron energy, whereas the set of sodium iodide scintillators searches for the annihilation gamma rays. The features and performances of the experimental device are presented and the results obtained for the half-life limits of the processes investigated are reported. ((orig.)).

1995-01-01

244

Search for heavy bottomlike quarks decaying to an electron or muon and jets in pp collisions at ?s = 1.96??TeV.  

Science.gov (United States)

We report the most sensitive direct search for pair production of fourth-generation bottomlike chiral quarks (b') each decaying promptly to tW. We search for an excess of events with an electron or muon, at least five jets (one identified as due to a b or c quark), and an imbalance of transverse momentum by using data from pp collisions collected by the CDF II detector at Fermilab with an integrated luminosity of 4.8??fb(-1). We observe events consistent with background expectation, calculate upper limits on the b' pair-production cross section (?(bb')) ?30??fb for m(b') > 375??GeV/c2), and exclude m(b') < 372??GeV/c2 at 95% confidence level assuming a 100% branching ratio of b' to tW. PMID:21561183

Aaltonen, T; Álvarez González, B; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Appel, J A; Apresyan, A; Arisawa, T; Artikov, A; Asaadi, J; Ashmanskas, W; Auerbach, B; Aurisano, A; Azfar, F; Badgett, W; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Barria, P; Bartos, P; Bauce, M; Bauer, G; Bedeschi, F; Beecher, D; Behari, S; Bellettini, G; Bellinger, J; Benjamin, D; Beretvas, A; Bhatti, A; Binkley, M; Bisello, D; Bizjak, I; Bland, K R; Blumenfeld, B; Bocci, A; Bodek, A; Bortoletto, D; Boudreau, J; Boveia, A; Brau, B; Brigliadori, L; Brisuda, A; Bromberg, C; Brucken, E; Bucciantonio, M; Budagov, J; Budd, H S; Budd, S; Burkett, K; Busetto, G; Bussey, P; Buzatu, A; Calancha, C; Camarda, S; Campanelli, M; Campbell, M; Canelli, F; Canepa, A; Carls, B; Carlsmith, D; Carosi, R; Carrillo, S; Carron, S; Casal, B; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavaliere, V; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, K; Chokheli, D; Chou, J P; Chung, W H; Chung, Y S; Ciobanu, C I; Ciocci, M A; Clark, A; Compostella, G; Convery, M E; Conway, J; Corbo, M; Cordelli, M; Cox, C A; Cox, D J; Crescioli, F; Cuenca Almenar, C; Cuevas, J; Culbertson, R; Dagenhart, D; d'Ascenzo, N; Datta, M; de Barbaro, P; De Cecco, S; De Lorenzo, G; Dell'Orso, M; Deluca, C; Demortier, L; Deng, J; Deninno, M; Devoto, F; d'Errico, M; Di Canto, A; Di Ruzza, B; Dittmann, J R; D'Onofrio, M; Donati, S; Dong, P; Dorigo, M; Dorigo, T; Ebina, K; Elagin, A; Eppig, A; Erbacher, R; Errede, D; Errede, S; Ershaidat, N; Eusebi, R; Fang, H C; Farrington, S; Feindt, M; Fernandez, J P; Ferrazza, C; Field, R; Flanagan, G; Forrest, R; Frank, M J; Franklin, M; Freeman, J C; Funakoshi, Y; Furic, I; Gallinaro, M; Galyardt, J; Garcia, J E; Garfinkel, A F; Garosi, P; Gerberich, H; Gerchtein, E; Giagu, S; Giakoumopoulou, V; Giannetti, P; Gibson, K; Ginsburg, C M; Giokaris, N; Giromini, P; Giunta, M; Giurgiu, G; Glagolev, V; Glenzinski, D; Gold, M; Goldin, D; Goldschmidt, N; Golossanov, A; Gomez, G; Gomez-Ceballos, G; Goncharov, M; González, O; Gorelov, I; Goshaw, A T; Goulianos, K; Gresele, A; Grinstein, S; Grosso-Pilcher, C; Group, R C; Guimaraes da Costa, J; Gunay-Unalan, Z; Haber, C; Hahn, S R; Halkiadakis, E; Hamaguchi, A; Han, J Y; Happacher, F; Hara, K; Hare, D; Hare, M; Harr, R F; Hatakeyama, K; Hays, C; Heck, M; Heinrich, J; Herndon, M; Hewamanage, S; Hidas, D; Hocker, A; Hopkins, W; Horn, D; Hou, S; Hughes, R E; Hurwitz, M; Husemann, U; Hussain, N; Hussein, M; Huston, J; Introzzi, G; Iori, M; Ivanov, A; James, E; Jang, D; Jayatilaka, B; Jeon, E J; Jha, M K; Jindariani, S; Johnson, W; Jones, M; Joo, K K; Jun, S Y; Junk, T R; Kamon, T; Karchin, P E; Kato, Y; Ketchum, W; Keung, J; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, H W; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kimura, N; Kirby, M; Klimenko, S; Kondo, K; Kong, D J; Konigsberg, J; Kotwal, A V; Kreps, M; Kroll, J; Krop, D; Krumnack, N; Kruse, M; Krutelyov, V; Kuhr, T; Kurata, M; Kwang, S; Laasanen, A T; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; Lazzizzera, I; LeCompte, T; Lee, E; Lee, H S; Lee, J S; Lee, S W; Leo, S; Leone, S; Lewis, J D; Lin, C-J; Linacre, J; Lindgren, M; Lipeles, E; Lister, A; Litvintsev, D O; Liu, C; Liu, Q; Liu, T; Lockwitz, S; Lockyer, N S; Loginov, A; Lucchesi, D; Lueck, J; Lujan, P; Lukens, P; Lungu, G; Lys, J; Lysak, R; Madrak, R; Maeshima, K; Makhoul, K; Maksimovic, P; Malik, S; Manca, G; Manousakis-Katsikakis, A; Margaroli, F; Marino, C; Martínez, M; Martínez-Ballarín, R; Mastrandrea, P; Mathis, M; Mattson, M E; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Mehtala, P; Menzione, A; Mesropian, C; Miao, T; Mietlicki, D; Mitra, A; Miyake, H; Moed, S; Moggi, N; Mondragon, M N; Moon, C S; Moore, R; Morello, M J; Morlock, J; Movilla Fernandez, P; Mukherjee, A; Muller, Th; Murat, P; Mussini, M; Nachtman, J; Nagai, Y; Naganoma, J; Nakano, I; Napier, A; Nett, J; Neu, C; Neubauer, M S; Nielsen, J; Nodulman, L; Norniella, O; Nurse, E; Oakes, L; Oh, S H; Oh, Y D; Oksuzian, I; Okusawa, T; Orava, R; Ortolan, L; Pagan Griso, S; Pagliarone, C; Palencia, E; Papadimitriou, V; Paramonov, A A; Patrick, J; Pauletta, G; Paulini, M; Paus, C; Pellett, D E; Penzo, A; Phillips, T J; Piacentino, G; Pianori, E; Pilot, J; Pitts, K; Plager, C; Pondrom, L; Potamianos, K; Poukhov, O; Prokoshin, F; Pronko, A; Ptohos, F; Pueschel, E; Punzi, G; Pursley, J; Rahaman, A; Ramakrishnan, V; Ranjan, N; Redondo, I; Renton, P; Rescigno, M; Rimondi, F; Ristori, L; Robson, A; Rodrigo, T; Rodriguez, T; Rogers, E; Rolli, S; Roser, R; Rossi, M; Rubbo, F; Ruffini, F; Ruiz, A; Russ, J; Rusu, V; Safonov, A; Sakumoto, W K; Sakurai, Y; Santi, L; Sartori, L; Sato, K; Saveliev, V; Savoy-Navarro, A; Schlabach, P; Schmidt, A; Schmidt, E E; Schmidt, M P

2011-04-06

245

Search for heavy bottomlike quarks decaying to an electron or muon and jets in pp collisions at ?s = 1.96??TeV.  

UK PubMed Central (United Kingdom)

We report the most sensitive direct search for pair production of fourth-generation bottomlike chiral quarks (b') each decaying promptly to tW. We search for an excess of events with an electron or muon, at least five jets (one identified as due to a b or c quark), and an imbalance of transverse momentum by using data from pp collisions collected by the CDF II detector at Fermilab with an integrated luminosity of 4.8??fb(-1). We observe events consistent with background expectation, calculate upper limits on the b' pair-production cross section (?(bb')) ?30??fb for m(b') > 375??GeV/c2), and exclude m(b') < 372??GeV/c2 at 95% confidence level assuming a 100% branching ratio of b' to tW.

Aaltonen T; Álvarez González B; Amerio S; Amidei D; Anastassov A; Annovi A; Antos J; Apollinari G; Appel JA; Apresyan A; Arisawa T; Artikov A; Asaadi J; Ashmanskas W; Auerbach B; Aurisano A; Azfar F; Badgett W; Barbaro-Galtieri A; Barnes VE; Barnett BA; Barria P; Bartos P; Bauce M; Bauer G; Bedeschi F; Beecher D; Behari S; Bellettini G; Bellinger J; Benjamin D; Beretvas A; Bhatti A; Binkley M; Bisello D; Bizjak I; Bland KR; Blumenfeld B; Bocci A; Bodek A; Bortoletto D; Boudreau J; Boveia A; Brau B; Brigliadori L; Brisuda A; Bromberg C; Brucken E; Bucciantonio M; Budagov J; Budd HS; Budd S; Burkett K; Busetto G; Bussey P; Buzatu A; Calancha C; Camarda S; Campanelli M; Campbell M; Canelli F; Canepa A; Carls B; Carlsmith D; Carosi R; Carrillo S; Carron S; Casal B; Casarsa M; Castro A; Catastini P; Cauz D; Cavaliere V; Cavalli-Sforza M; Cerri A; Cerrito L; Chen YC; Chertok M; Chiarelli G; Chlachidze G; Chlebana F; Cho K; Chokheli D; Chou JP; Chung WH; Chung YS; Ciobanu CI; Ciocci MA; Clark A; Compostella G; Convery ME; Conway J; Corbo M; Cordelli M; Cox CA; Cox DJ; Crescioli F; Cuenca Almenar C; Cuevas J; Culbertson R; Dagenhart D; d'Ascenzo N; Datta M; de Barbaro P; De Cecco S; De Lorenzo G; Dell'Orso M; Deluca C; Demortier L; Deng J; Deninno M; Devoto F; d'Errico M; Di Canto A; Di Ruzza B; Dittmann JR; D'Onofrio M; Donati S; Dong P; Dorigo M; Dorigo T; Ebina K; Elagin A; Eppig A; Erbacher R; Errede D; Errede S; Ershaidat N; Eusebi R; Fang HC; Farrington S; Feindt M; Fernandez JP; Ferrazza C; Field R; Flanagan G; Forrest R; Frank MJ; Franklin M; Freeman JC; Funakoshi Y; Furic I; Gallinaro M; Galyardt J; Garcia JE; Garfinkel AF; Garosi P; Gerberich H; Gerchtein E; Giagu S; Giakoumopoulou V; Giannetti P; Gibson K; Ginsburg CM; Giokaris N; Giromini P; Giunta M; Giurgiu G; Glagolev V; Glenzinski D; Gold M; Goldin D; Goldschmidt N; Golossanov A; Gomez G; Gomez-Ceballos G; Goncharov M; González O; Gorelov I; Goshaw AT; Goulianos K; Gresele A; Grinstein S; Grosso-Pilcher C; Group RC; Guimaraes da Costa J; Gunay-Unalan Z; Haber C; Hahn SR; Halkiadakis E; Hamaguchi A; Han JY; Happacher F; Hara K; Hare D; Hare M; Harr RF; Hatakeyama K; Hays C; Heck M; Heinrich J; Herndon M; Hewamanage S; Hidas D; Hocker A; Hopkins W; Horn D; Hou S; Hughes RE; Hurwitz M; Husemann U; Hussain N; Hussein M; Huston J; Introzzi G; Iori M; Ivanov A; James E; Jang D; Jayatilaka B; Jeon EJ; Jha MK; Jindariani S; Johnson W; Jones M; Joo KK; Jun SY; Junk TR; Kamon T; Karchin PE; Kato Y; Ketchum W; Keung J; Khotilovich V; Kilminster B; Kim DH; Kim HS; Kim HW; Kim JE; Kim MJ; Kim SB; Kim SH; Kim YK; Kimura N; Kirby M; Klimenko S; Kondo K; Kong DJ; Konigsberg J; Kotwal AV; Kreps M; Kroll J; Krop D; Krumnack N; Kruse M; Krutelyov V; Kuhr T; Kurata M; Kwang S; Laasanen AT; Lami S; Lammel S; Lancaster M; Lander RL; Lannon K; Lath A; Latino G; Lazzizzera I; LeCompte T; Lee E; Lee HS; Lee JS; Lee SW; Leo S; Leone S; Lewis JD; Lin CJ; Linacre J; Lindgren M; Lipeles E; Lister A; Litvintsev DO; Liu C; Liu Q; Liu T; Lockwitz S; Lockyer NS; Loginov A; Lucchesi D; Lueck J; Lujan P; Lukens P; Lungu G; Lys J; Lysak R; Madrak R; Maeshima K; Makhoul K; Maksimovic P; Malik S; Manca G; Manousakis-Katsikakis A; Margaroli F; Marino C; Martínez M; Martínez-Ballarín R; Mastrandrea P; Mathis M; Mattson ME; Mazzanti P; McFarland KS; McIntyre P; McNulty R; Mehta A; Mehtala P; Menzione A; Mesropian C; Miao T; Mietlicki D; Mitra A; Miyake H; Moed S; Moggi N; Mondragon MN; Moon CS; Moore R; Morello MJ; Morlock J; Movilla Fernandez P; Mukherjee A; Muller T; Murat P; Mussini M; Nachtman J; Nagai Y; Naganoma J; Nakano I; Napier A; Nett J; Neu C; Neubauer MS; Nielsen J; Nodulman L; Norniella O; Nurse E; Oakes L; Oh SH; Oh YD; Oksuzian I; Okusawa T; Orava R; Ortolan L; Pagan Griso S; Pagliarone C; Palencia E; Papadimitriou V; Paramonov AA; Patrick J; Pauletta G; Paulini M; Paus C; Pellett DE; Penzo A; Phillips TJ; Piacentino G; Pianori E; Pilot J; Pitts K; Plager C; Pondrom L; Potamianos K; Poukhov O; Prokoshin F; Pronko A; Ptohos F; Pueschel E; Punzi G; Pursley J; Rahaman A; Ramakrishnan V; Ranjan N; Redondo I; Renton P; Rescigno M; Rimondi F; Ristori L; Robson A; Rodrigo T; Rodriguez T; Rogers E; Rolli S; Roser R; Rossi M; Rubbo F; Ruffini F; Ruiz A; Russ J; Rusu V; Safonov A; Sakumoto WK; Sakurai Y; Santi L; Sartori L; Sato K; Saveliev V; Savoy-Navarro A; Schlabach P; Schmidt A; Schmidt EE; Schmidt MP; Schmitt M; Schwarz T; Scodellaro L; Scribano A; Scuri F; Sedov A; Seidel S; Seiya Y; Semenov A; Sforza F; Sfyrla A; Shalhout SZ; Shears T; Shepard PF; Shimojima M; Shiraishi S; Shochet M; Shreyber I; Simonenko A; Sinervo P; Sissakian A; Sliwa K; Smith JR; Snider FD; Soha A; Somalwar S; Sorin V; Squillacioti P; Stancari M; Stanitzki M; St Denis R; Stelzer B; Stelzer-Chilton O; Stentz D; Strologas J; Strycker GL; Sudo Y; Sukhanov A; Suslov I; Takemasa K; Takeuchi Y; Tang J; Tecchio M; Teng PK; Thom J; Thome J; Thompson GA; Thomson E; Ttito-Guzmán P; Tkaczyk S; Toback D

2011-04-01

246

Search for neutral leptons  

International Nuclear Information System (INIS)

At present we know of three kinds of neutral leptons: the electron neutrino, the muon neutrino, and the tau neutrino. This paper reviews the search for additional neutral leptons. The method and significance of a search depends upon the model used for the neutral lepton being sought. Some models for the properties and decay modes of proposed neutral leptons are described. Past and present searches are reviewed. The limits obtained by some completed searches are given, and the methods of searches in progress are described. Future searches are discussed. 41 references

1984-11-03

247

Search for the 1+ state of copper in the ''electron'' superconductor Nd2-xCexCuO4  

International Nuclear Information System (INIS)

We used the resonant photoemission technique to search for Cu1+ resonances in the spectra of superconducting and non-superconducting compounds in the Nd2-xCexCuO4 family. No evidence for such resonances was found. The possible implications of this somewhat suprising result are discussed

1990-01-25

248

Sensitive Search for a Permanent Muon Electric Dipole Moment  

CERN Document Server

We are proposing a new method to carry out a dedicated search for a permanent electric dipole moment (EDM) of the muon with a sensitivity at a level of 10^{-24} e cm. The experimental design exploits the strong motional electric field sensed by relativistic particles in a magnetic storage ring. As a key feature, a novel technique has been invented in which the g-2 precession is compensated with radial electric field. This technique will benefit greatly when the intense muon sources advocated by the developers of the muon storage rings and the muon colliders become available.

Semertzidis, Y K; Danby, G T; Jackson, J W; Larsen, R; Lazarus, D M; Meng, W; Morse, W M; Ozben, C; Prigl, R; Carey, R M; Miller, J P; Rind, O; Roberts, B L; Sulak, Lawrence R; Balakin, V; Bazhan, A; Dudnikov, A; Khazin, B I; Sylvestrov, G; Orlov, Yu F; Jungmann, Klaus; Debevec, P T; Hertzog, D W; Onderwater, Gerco; Stephenson, E J; Cushman, P B; Kronkvist, I J; Farley, Francis J M

2000-01-01

249

Towards the search of electron electric dipole moment: correlation calculations of the P,T-violation effect in the Eu$^{++}$ cation  

CERN Multimedia

Recently the Eu$_{0.5}$Ba$_{0.5}$TiO$_{3}$ solid was suggested as a promising candidate for experimental search of the electron electric dipole moment. To interpret the results of this experiment one should calculate the effective electric field acting on an unpaired (spin-polarized) electrons of europium cation in the crystal because the value of this field cannot be measured experimentally. The Eu$^{++}$ cation is considered in the paper in the uniform external electric field \\Eext\\ as our first and simplest model simulating the state of europium in the crystal. We have performed high-level electronic structure correlation calculation using coupled clusters theory (and scalar-relativistic approximation for valence and outer core electrons at the molecular pseudopotential calculation stage that is followed by the four-component spinor restoration of the core electronic structure) to evaluate the enhancement coefficient $K= \\Eeff/\\Eext$ (where \\Eext\\ is the applied external electric field and \\Eeff\\ is the in...

Skripnikov, L V; Petrov, A N; Mosyagin, N S; Sushkov, O P

2011-01-01

250

Search for Wprime Boson Decaying to Electron-Neutrino Pairs in pbarp Collisions at sqrt{s}=1.96 TeV  

CERN Multimedia

We present the results of a search for Wprime boson decaying to electron-neutrino pairs in pbarp collisions at a center-of-mass energy of 1.96 TeV, using a data sample corresponding to 205 pb^-1 of integrated luminosity collected by the CDF II detector at Fermilab. We observe no evidence for this decay mode and set limits on the production cross section times branching fraction, assuming the neutrinos from Wprime boson decays to be light. If we assume the manifest left-right symmetric model, we exclude a Wprime boson with mass less than 788 GeV/c^2 at the 95% confidence level.

Abulencia, A; Affolder, T; Akimoto, T; Albrow, M G; Ambrose, D; Amerio, S; Amidei, D; Anastassov, A; Anikeev, K; Annovi, A; Antos, J; Aoki, M; Apollinari, G; Arguin, J F; Arisawa, T; Artikov, A; Ashmanskas, W; Attal, A; Azfar, F; Azzi-Bacchetta, P; Azzurri, P; Bacchetta, N; Badgett, W; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Baroiant, S; Bartsch, V; Bauer, G; Bedeschi, F; Behari, S; Belforte, S; Bellettini, G; Bellinger, J; Belloni, A; Benjamin, D; Beretvas, A; Beringer, J; Berry, T; Bhatti, A; Binkley, M; Bisello, D; Blair, R E; Blocker, C; Blumenfeld, B; Bocci, A; Bodek, A; Boisvert, V; Bölla, G; Bolshov, A; Bortoletto, D; Boudreau, J; Boveia, A; Brau, B; Brigliadori, L; Bromberg, C; Brubaker, E; Budagov, Yu A; Budd, H S; Budd, S; Budroni, S; Burkett, K; Busetto, G; Bussey, P; Byrum, K L; Cabrera, S; Campanelli, M; Campbell, M; Canelli, F; Canepa, A; Carillo, S; Carlsmith, D; Carosi, R; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chang, S H; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, I; Cho, K; Chokheli, D; Chou, J P; Choudalakis, G; Chuang, S H; Chung, K; Chung, W H; Chung, Y S; Ciljak, M; Ciobanu, C I; Ciocci, M A; Clark, A; Clark, D; Coca, M; Compostella, G; Convery, M E; Conway, J; Cooper, B; Copic, K; Cordelli, M; Cortiana, G; Crescioli, F; Cuenca-Almenar, C; Cuevas-Maestro, J; Culbertson, R; Cully, J C; Cyr, D; Da Ronco, S; D'Auria, S; Davies, T; D'Onofrio, M; Dagenhart, D; De Barbaro, P; De Cecco, S; Deisher, A; De Lentdecker, G; Dell'Orso, Mauro; Delli Paoli, F; Demortier, L; Deng, J; Deninno, M; De Pedis, D; Derwent, P F; Di Giovanni, G P; Dionisi, C; Di Ruzza, B; Dittmann, J R; Di Turo, P; Dorr, C; Donati, S; Donega, M; Dong, P; Donini, J; Dorigo, T; Dube, S; Efron, J; Erbacher, R; Errede, D; Errede, S; Eusebi, R; Fang, H C; Farrington, S; Fedorko, I; Fedorko, W T; Feild, R G; Feindt, M; Fernández, J P; Field, R; Flanagan, G; Foland, A; Forrester, S; Foster, G W; Franklin, M; Freeman, J C; Furic, I; Gallinaro, M; Galyardt, J; García, J E; Garberson, F; Garfinkel, A F; Gay, C; Gerberich, H; Gerdes, D; Giagu, S; Giannetti, P; Gibson, A; Gibson, K; Gimmell, J L; Ginsburg, C; Giokaris, N; Giordani, M; Giromini, P; Giunta, M; Giurgiu, G; Glagolev, V; Glenzinski, D; Gold, M; Goldschmidt, N; Goldstein, J; Gómez, G; Gómez-Ceballos, G; Goncharov, M; González, O; Gorelov, I; Goshaw, A T; Goulianos, K; Gresele, A; Griffiths, M; Grinstein, S; Grosso-Pilcher, C; Group, R C; Grundler, U; Guimarães da Costa, J; Gunay-Unalan, Z; Haber, C; Hahn, K; Hahn, S R; Halkiadakis, E; Hamilton, A; Han, B Y; Han, J Y; Handler, R; Happacher, F; Hara, K; Hare, M; Harper, S; Harr, R F; Harris, R M; Hartz, M; Hatakeyama, K; Hauser, J; Heijboer, A; Heinemann, B; Heinrich, J; Henderson, C; Herndon, M; Heuser, J; Hidas, D; Hill, C S; Hirschbuehl, D; Höcker, A; Holloway, A; Hou, S; Houlden, M; Hsu, S C; Huffman, B T; Hughes, R E; Husemann, U; Huston, J; Incandela, J R; Introzzi, G; Iori, M; Ishizawa, Y; Ivanov, A; Iyutin, B; James, E; Jang, D; Jayatilaka, B; Jeans, D; Jensen, H; Jeon, E J; Jindariani, S; Jones, M; Joo, K K; Jun, S Y; Jung, J E; Junk, T R; Kamon, T; Karchin, P E; Kato, Y; Kemp, Y; Kephart, R; Kerzel, U; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kimura, N; Kirsch, L; Klimenko, S; Klute, M; Knuteson, B; Ko, B R; Kondo, K; Kong, D J; Konigsberg, J; Korytov, A; Kotwal, A V; Kovalev, A; Kraan, A C; Kraus, J; Kravchenko, I; Kreps, M; Kroll, J; Krumnack, N; Kruse, M; Krutelyov, V; Kubo, T; Kuhlmann, S E; Kuhr, T; Kusakabe, Y; Kwang, S; Laasanen, A T; Lai, S; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; Lazzizzera, I; LeCompte, T; Lee, J; Lee, J; Lee, Y J; Lee, S W; Lefèvre, R; Leonardo, N; Leone, S; Levy, S; Lewis, J D; Lin, C; Lin, C S; Lindgren, M; Lipeles, E; Liss, T M; Lister, A; Litvintsev, D O; Liu, T; Lockyer, N S; Loginov, A; Loreti, M; Loverre, P F; Lu, R S; Lucchesi, D; Lujan, P; Lukens, P; Lungu, G; Lyons, L; Lys, J; Lysak, R; Lytken, E; Mack, P; MacQueen, D; Madrak, R; Maeshima, K; Makhoul, K; Mäki, T; Maksimovic, P; Malde, S; Manca, G; Margaroli, F; Marginean, R; Marino, C; Marino, C P; Martin, A; Martin, M; Martin, V; Martínez, M; Maruyama, T; Mastrandrea, P; Masubuchi, T; Matsunaga, H; Mattson, M E; Mazini, R; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Mehtälä, P; Menzemer, S; Menzione, A; Merkel, P; Mesropian, C; Messina, A; Miao, T; Miladinovic, N; Miles, J; Miller, R; Mills, C; Milnik, M; Mitra, A; Mitselmakher, G; Miyamoto, A; Moed, S; Moggi, N; Mohr, B; Moore, R; Morello, M; Movilla-Fernández, P A; Mülmenstädt, J; Mukherjee, A; Müller, T; Mumford, R; Murat, P; Nachtman, J; Nagano, A; Naganoma, J; Nakano, I; Napier, A; Necula, V; Neu, C; Neubauer, M S; Nielsen, J; Nigmanov, T; Nodulman, L

2006-01-01

251

Search for saddle-point electrons using the continuum-distorted-wave eikonal initial-state model  

International Nuclear Information System (INIS)

[en] The continuum-distorted-wave eikonal initial-state (CDWEIS) model is used to study the ionization of hydrogen by protons of energy 10--500 keV. Ejected electron spectra are presented and discussed in the context of the saddle-point mechanism. The behavior of the ejected electron spectrum as the charge of the incident projectile is varied is also considered. It is concluded that within its range of validity, CDWEIS does not provide any evidence of the existence of saddle-point electrons

1995-01-01

252

Results From The 1994 Lsnd Neutrino Oscillation Searches In Both The Muon Antineutrino Going To Electron Antineutrino And Muon Neutrino Going To Electron Neutrino Channels  

CERN Multimedia

The Liquid Scintillator Neutrino Detector (LSND) 1994 data for the oscillation searches yield limits on the mixing of the two flavors. A combined treatment of the two channels, and the resulting new limits are presented, under the assumptions of 2 family mixing and no CP violating terms in the mixing matrix. Appended to the main work, a critique is made of the analysis that seems to find a strong signal in the same data, and problems with that analysis are identified. --- 21 --- AN

Hill, J E

1995-01-01

253

Low-pressure micro-strip gas chamber and a search for a high-efficiency secondary-electron emitter  

International Nuclear Information System (INIS)

The test beam performance of a low-pressure micro-strip gas chamber with a thick CsI secondary-electron emitting surface as the source of primary ionization is presented. A study of the secondary-electron yield of CsI and KCl coated surfaces are discussed, as well as a promising new technique, CsI-treated CVD diamond films

1994-01-01

254

Search for High Energy Electrons from New Neutral Massive Gauge Boson Decay in the CMS Detector at the LHC Using Monte Carlo Simulation  

Directory of Open Access Journals (Sweden)

Full Text Available The existence of new heavy neutral massive boson Z? is a feature of many extensions of Standard Model models as the two-Higgs-doublet model (2HDM), the Hidden Abelian Higgs Model (HAHM), Left-Right Symmetric Model (LRSM), Sequential Standard Model (SSM) and Baryon number minus Lepton number Model (B-L). In the present work we search for two high energy electrons produced from decayingheavy neutral massive boson in the events produced in proton-proton collisions at LHC and can be detected by CMS detector. We used the data which is produced from proton-proton collisions by Monte Carlo events generator for different energies at LHC, then we use the angular distribution, invariant mass, combined transverse momentum and combined rapidity distributions for the two high energy electrons produced from decay channel to detect thesignal. B-L extension of the SM model predicts the existence of aheavy neutral massive boson at high energies. From our results which we had simulated using MC programs forin the B-L extension of standard model, we predict a possible existence of new gaugeat LHC in the mass range 1 TeV to 1.5 TeV via electrons identification of the two high energy electrons by CMS detector.

H. M. M. Mansour; Nady Bakhet

2013-01-01

255

Search for highly-interacting, fractionally-charged particles in electron-positron annihilation at 29 GeV  

International Nuclear Information System (INIS)

We have searched for relativistic, highly-interacting fractionally-charged particles using the free-quark detector at the e+e- storage ring PEP. No convincing events were seen. For an assumed interaction cross section with matter of 100 times geometric, 90% confidence level upper limits on their production relative to e+e- -> ?+?- are between 0.025 and 0.49 depending on quark mass (up to 13 GeV/c2) and reaction type. These are the first published limits on the production of fractionally charged particles with interaction cross sections of 100 times geometric or larger. (orig.).

1984-01-01

256

Analysis of medium-term economic development and energy consumptions through the EURECA-EXPLOR-EDM model chain. Final report  

Energy Technology Data Exchange (ETDEWEB)

The macroeconomic and sectorial results obtained through a series of Explor-EDM runs are described; their achievement also required the introduction of some innovations in the data banks. Throughout this work some exogenous variables in the Explor model data bank were focused, which now require up-dating and new calibration. The re-structuring work of the data bank as a whole started, and new simulation tests will be performed after its completion. The main innovations required are as follows: introduction of the new macroeconomic assumptions worked out by the EEC through the Eureca model; introduction of the new historic sequence of energy consumption. In particular: gases were subdivided into natural gas and other gases; the consumptions arising from industrial transport were separated from the industrial consumptions and classified under transport; the historic sequence of consumptions was prolonged till 1979; and introduction of the new econometric estimates.

Merzagora, N.

1983-01-01

257

Remedial design through effective electronic associations  

Energy Technology Data Exchange (ETDEWEB)

Black and Veatch Special Projects Corp. (BVSPC) used an environmental data management system (EDMS) to consolidate x-ray fluorescence (XRF), global positioning system (GPS), and laboratory analytical data into a unique and flexible electronic database. Cost savings were acknowledged in all phases of the remedial design due to the development and use of the EDMS and its distinct associations with various electronic software packages. The EDMS allowed effective and efficient completion of the remedial design investigation of the Oronogo-Duenweg Mining Belt Site. The Site is a 125-year old mining community in Jasper County, Missouri. Approximately 6,500 residences are now located within the 60 square-mile Superfund Site where lead and zinc were mined. Smelting and mining activities were conducted in several areas throughout the community. These operations left approximately 9 million tons of mine wastes at the Site upon completion of the mining activities. The purpose of the remedial design investigation was to quantify and identify the residential yards that were adversely affected by these activities.

Deis, J.L.; Wankum, R.D.

1999-07-01

258

Using the Earth as a polarized electron source to search for long-range spin-spin interactions.  

UK PubMed Central (United Kingdom)

Many particle-physics models that extend the standard model predict the existence of long-range spin-spin interactions. We propose an approach that uses the Earth as a polarized spin source to investigate these interactions. Using recent deep-Earth geophysics and geochemistry results, we create a comprehensive map of electron polarization within the Earth induced by the geomagnetic field. We examine possible long-range interactions between these spin-polarized geoelectrons and the spin-polarized electrons and nucleons in three laboratory experiments. By combining our model and the results from these experiments, we establish bounds on torsion gravity and possible long-range spin-spin forces associated with the virtual exchange of either spin-one axial bosons or unparticles.

Hunter L; Gordon J; Peck S; Ang D; Lin JF

2013-02-01

259

Search for highly-interacting, fractionally-charged particles in electron-positron annihilation at 29 GeV  

Energy Technology Data Exchange (ETDEWEB)

We have searched for relativistic, highly-interacting fractionally-charged particles using the free-quark detector at the e/sup +/e/sup -/ storage ring PEP. No convincing events were seen. For an assumed interaction cross section with matter of 100 times geometric, 90% confidence level upper limits on their production relative to e/sup +/e/sup -/ -> ..mu../sup +/..mu../sup -/ are between 0.025 and 0.49 depending on quark mass (up to 13 GeV/c/sup 2/) and reaction type. These are the first published limits on the production of fractionally charged particles with interaction cross sections of 100 times geometric or larger.

Guryn, W.; Parker, S.; Fries, R.; Besset, D.; Chew, D.M.; Ely, R.P.; Freedman, S.J.; Gobbi, B.; Harris, F.A.; Karliner, I.

1984-05-17

260

Search for a heavy neutral particle decaying into an electron and a muon using 1 fb$^-1$ of ATLAS data  

CERN Multimedia

A search is presented for a high mass neutral particle that decays directly to the emu final state. The data sample was recorded by the ATLAS detector in sqrt{s}=7 TeV pp collisions at the LHC from March to June 2011 and corresponds to an integrated luminosity of 1.07 fb^-1. The data are found to be consistent with the Standard Model background. The high emu mass region is used to set 95% confidence level upper limits on the production of two possible new physics processes: tau sneutrinos in an R-parity violating supersymmetric model and Z'-like vector bosons in a lepton flavor violating model.

Aad, Georges; Abdallah, Jalal; Abdelalim, Ahmed Ali; Abdesselam, Abdelouahab; Abdinov, Ovsat; Abi, Babak; Abolins, Maris; Abramowicz, Halina; Abreu, Henso; Acerbi, Emilio; Acharya, Bobby Samir; Adams, David; Addy, Tetteh; Adelman, Jahred; Aderholz, Michael; Adomeit, Stefanie; Adragna, Paolo; Adye, Tim; Aefsky, Scott; Aguilar-Saavedra, Juan Antonio; Aharrouche, Mohamed; Ahlen, Steven; Ahles, Florian; Ahmad, Ashfaq; Ahsan, Mahsana; Aielli, Giulio; Akdogan, Taylan; ?kesson, Torsten Paul Ake; Akimoto, Ginga; Akimov, Andrei; Akiyama, Kunihiro; Alam, Mohammad; Alam, Muhammad Aftab; Albert, Justin; Albrand, Solveig; Aleksa, Martin; Aleksandrov, Igor; Alessandria, Franco; Alexa, Calin; Alexander, Gideon; Alexandre, Gauthier; Alexopoulos, Theodoros; Alhroob, Muhammad; Aliev, Malik; Alimonti, Gianluca; Alison, John; Aliyev, Magsud; Allport, Phillip; Allwood-Spiers, Sarah; Almond, John; Aloisio, Alberto; Alon, Raz; Alonso, Alejandro; Alviggi, Mariagrazia; Amako, Katsuya; Amaral, Pedro; Amelung, Christoph; Ammosov, Vladimir; Amorim, Antonio; Amorós, Gabriel; Amram, Nir; Anastopoulos, Christos; Ancu, Lucian Stefan; Andari, Nansi; Andeen, Timothy; Anders, Christoph Falk; Anders, Gabriel; Anderson, Kelby; Andreazza, Attilio; Andrei, George Victor; Andrieux, Marie-Laure; Anduaga, Xabier; Angerami, Aaron; Anghinolfi, Francis; Anjos, Nuno; Annovi, Alberto; Antonaki, Ariadni; Antonelli, Mario; Antonov, Alexey; Antos, Jaroslav; Anulli, Fabio; Aoun, Sahar; Aperio Bella, Ludovica; Apolle, Rudi; Arabidze, Giorgi; Aracena, Ignacio; Arai, Yasuo; Arce, Ayana; Archambault, John-Paul; Arfaoui, Samir; Arguin, Jean-Francois; Arik, Engin; Arik, Metin; Armbruster, Aaron James; Arnaez, Olivier; Arnault, Christian; Artamonov, Andrei; Artoni, Giacomo; Arutinov, David; Asai, Shoji; Asfandiyarov, Ruslan; Ask, Stefan; ?sman, Barbro; Asquith, Lily; Assamagan, Ketevi; Astbury, Alan; Astvatsatourov, Anatoli; Atoian, Grigor; Aubert, Bernard; Auge, Etienne; Augsten, Kamil; Aurousseau, Mathieu; Austin, Nicholas; Avolio, Giuseppe; Avramidou, Rachel Maria; Axen, David; Ay, Cano; Azuelos, Georges; Azuma, Yuya; Baak, Max; Baccaglioni, Giuseppe; Bacci, Cesare; Bach, Andre; Bachacou, Henri; Bachas, Konstantinos; Bachy, Gerard; Backes, Moritz; Backhaus, Malte; Badescu, Elisabeta; Bagnaia, Paolo; Bahinipati, Seema; Bai, Yu; Bailey, David; Bain, Travis; Baines, John; Baker, Oliver Keith; Baker, Mark; Baker, Sarah; Banas, Elzbieta; Banerjee, Piyali; Banerjee, Swagato; Banfi, Danilo; Bangert, Andrea Michelle; Bansal, Vikas; Bansil, Hardeep Singh; Barak, Liron; Baranov, Sergei; Barashkou, Andrei; Barbaro Galtieri, Angela; Barber, Tom; Barberio, Elisabetta Luigia; Barberis, Dario; Barbero, Marlon; Bardin, Dmitri; Barillari, Teresa; Barisonzi, Marcello; Barklow, Timothy; Barlow, Nick; Barnett, Bruce; Barnett, Michael; Baroncelli, Antonio; Barone, Gaetano; Barr, Alan; Barreiro, Fernando; Barreiro Guimarães da Costa, João; Barrillon, Pierre; Bartoldus, Rainer; Barton, Adam Edward; Bartsch, Detlef; Bartsch, Valeria; Bates, Richard; Batkova, Lucia; Batley, Richard; Battaglia, Andreas; Battistin, Michele; Battistoni, Giuseppe; Bauer, Florian; Bawa, Harinder Singh; Beare, Brian; Beau, Tristan; Beauchemin, Pierre-Hugues; Beccherle, Roberto; Bechtle, Philip; Beck, Hans Peter; Beckingham, Matthew; Becks, Karl-Heinz; Beddall, Andrew; Beddall, Ayda; Bedikian, Sourpouhi; Bednyakov, Vadim; Bee, Christopher; Begel, Michael; Behar Harpaz, Silvia; Behera, Prafulla; Beimforde, Michael; Belanger-Champagne, Camille; Bell, Paul; Bell, William; Bella, Gideon; Bellagamba, Lorenzo; Bellina, Francesco; Bellomo, Massimiliano; Belloni, Alberto; Beloborodova, Olga; Belotskiy, Konstantin; Beltramello, Olga; Ben Ami, Sagi; Benary, Odette; Benchekroun, Driss; Benchouk, Chafik; Bendel, Markus; Benekos, Nektarios; Benhammou, Yan; Benjamin, Douglas; Benoit, Mathieu; Bensinger, James; Benslama, Kamal; Bentvelsen, Stan; Berge, David; Bergeaas Kuutmann, Elin; Berger, Nicolas; Berghaus, Frank; Berglund, Elina; Beringer, Jürg; Bernardet, Karim; Bernat, Pauline; Bernhard, Ralf; Bernius, Catrin; Berry, Tracey; Bertin, Antonio; Bertinelli, Francesco; Bertolucci, Federico; Besana, Maria Ilaria; Besson, Nathalie; Bethke, Siegfried; Bhimji, Wahid; Bianchi, Riccardo-Maria; Bianco, Michele; Biebel, Otmar; Bieniek, Stephen Paul; Bierwagen, Katharina; Biesiada, Jed; Biglietti, Michela; Bilokon, Halina; Bindi, Marcello; Binet, Sebastien; Bingul, Ahmet; Bini, Cesare; Biscarat, Catherine; Bitenc, Urban; Black, Kevin; Blair, Robert; Blanchard, Jean-Baptiste; Blanchot, Georges; Blazek, Tomas; Blocker, Craig; Blocki, Jacek

2011-01-01

 
 
 
 
261

Search for evidence of two-photon exchange in new experimental high momentum transfer data on electron deuteron elastic scattering  

International Nuclear Information System (INIS)

[en] The possible contribution of two-photon exchange to electron deuteron elastic scattering at relatively high momentum transfer is discussed. This study was motivated by the high precision data recently obtained at the Jefferson Laboratory. Using general arguments, based on crossing symmetry for the processes e-+h?e-+h and e++e-?h+bar h, we find a parametrization for the angular dependence of the interference between the one- and two-photon exchanges in the differential cross section for elastic ed scattering in terms of a new kinematical variable and compare our findings to the recent data. copyright 1999 The American Physical Society

1999-01-01

262

Searching for secluded dark matter via direct detection of recoiling nuclei as well as low energy electrons  

Energy Technology Data Exchange (ETDEWEB)

Motivated by recent cosmic ray experimental results there has been a proposition for a scenario where a secluded dark matter particle annihilates, primarily, into Standard Model leptons through a low mass mediator particle. We consider several varieties of this scenario depending on the type of mixing among gauge bosons and we study the implications in novel direct dark matter experiments for detecting low energy recoiling electrons. We find significant event rates and time modulation effects, especially in the case where the mediator is massless, that may be complementary to those from recoiling nuclei.

Dedes, A., E-mail: adedes@cc.uoi.g [Division of Theoretical Physics, University of Ioannina, GR 45110 (Greece); Giomataris, I. [CEA, Saclay, IRFU, Gif-sur-Yvette Cedex (France); Suxho, K.; Vergados, J.D. [Division of Theoretical Physics, University of Ioannina, GR 45110 (Greece)

2010-02-11

263

Searching for secluded dark matter via direct detection of recoiling nuclei as well as low energy electrons  

International Nuclear Information System (INIS)

[en] Motivated by recent cosmic ray experimental results there has been a proposition for a scenario where a secluded dark matter particle annihilates, primarily, into Standard Model leptons through a low mass mediator particle. We consider several varieties of this scenario depending on the type of mixing among gauge bosons and we study the implications in novel direct dark matter experiments for detecting low energy recoiling electrons. We find significant event rates and time modulation effects, especially in the case where the mediator is massless, that may be complementary to those from recoiling nuclei.

2010-02-11

264

Search for New Physics in High-Mass Electron-Positron Events in pp Collisions at ?(s)=1.96 TeV  

International Nuclear Information System (INIS)

We report the results of a search for a narrow resonance in electron-positron events in the invariant mass range of 150-950 GeV/c2 using 1.3 fb-1 of pp collision data at ?(s)=1.96 TeV collected by the CDF II detector at Fermilab. No significant evidence of such a resonance is observed and we interpret the results to exclude the standard-model-like Z' with a mass below 923 GeV/c2 and the Randall-Sundrum graviton with a mass below 807 GeV/c2 for k/Mpl=0.1, both at the 95% confidence level. Combining with diphoton data excludes the Randall-Sundrum graviton for masses below 889 GeV/c2 for k/Mpl=0.1.

2007-10-26

265

Search for New Physics in High Mass Electron-Positron Events in ppbar Collisions at $\\sqrt{s}$ = 1.96 TeV  

CERN Document Server

We report the results of a search for a narrow resonance in electron-positron events in the invariant mass range of 150-950 GeV/c^2 using 1.3 fb^-1 of ppbar collision data at $\\sqrt{s}$ = 1.96 TeV collected by the CDF II detector at Fermilab. No significant evidence of such a resonance is observed and we interpret the results to exclude the standard model-like Z' with a mass below 923 GeV/c^2 and the Randall-Sundrum graviton with a mass below 807 GeV/c^2 for k/M_pl=0.1, both at the 95% confidence level. Combining with di-photon data excludes the Randall-Sundrum graviton for masses below 889 GeV/c^2 for k/M_pl=0.1.

Aaltonen, T; Adelman, J; Affolder, T; Akimoto, T; Albrow, M G; Amerio, S; Amidei, D; Anastassov, A; Anikeev, K; Annovi, A; Antos, J; Aoki, M; Apollinari, G; Arisawa, T; Artikov, A; Ashmanskas, W; Attal, A; Aurisano, A; Azfar, F; Azzi-Bacchetta, P; Azzurri, P; Bacchetta, N; Badgett, W; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Baroiant, S; Bartsch, V; Bauer, G; Beauchemin, P H; Bedeschi, F; Behari, S; Bellettini, G; Bellinger, J; Belloni, A; Benjamin, D; Beretvas, A; Beringer, J; Berry, T; Bhatti, A; Binkley, M; Bisello, D; Bizjak, I; Blair, R E; Blocker, C; Blumenfeld, B; Bocci, A; Bodek, A; Boisvert, V; Bölla, G; Bolshov, A; Bortoletto, D; Boudreau, J; Boveia, A; Brau, B; Brigliadori, L; Bromberg, C; Brubaker, E; Budagov, Yu; Budd, H S; Budd, S; Burkett, K; Busetto, G; Bussey, P; Buzatu, A; Byrum, K L; Cabrera, S; Campanelli, M; Campbell, M; Canelli, F; Canepa, A; Carrillo, S; Carlsmith, D; Carosi, R; Carron, S; Casal, B; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chang, S H; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, I; Cho, K; Chokheli, D; Chou, J P; Choudalakis, G; Chuang, S H; Chung, K; Chung, W H; Chung, Y S; Cilijak, M; Ciobanu, C I; Ciocci, M A; Clark, A; Clark, D; Coca, M; Compostella, G; Convery, M E; Conway, J; Cooper, B; Copic, K; Cordelli, M; Cortiana, G; Crescioli, F; Cuenca-Almenar, C; Cuevas-Maestro, J; Culbertson, R; Cully, J C; Da Ronco, S; Datta, M; D'Auria, S; Davies, T; Dagenhart, D; De Barbaro, P; De Cecco, S; Deisher, A; De Lentdecker, G; De Lorenzo, G; Dell'Orso, Mauro; Delli Paoli, F; Demortier, L; Deng, J; Deninno, M; De Pedis, D; Derwent, P F; Di Giovanni, G P; Dionisi, C; Di Ruzza, B; Dittmann, J R; D'Onofrio, M; Dorr, C; Donati, S; Dong, P; Donini, J; Dorigo, T; Dube, S; Efron, J; Erbacher, R; Errede, D; Errede, S; Eusebi, R; Fang, H C; Farrington, S; Fedorko, I; Fedorko, W T; Feild, R G; Feindt, M; Fernández, J P; Field, R; Flanagan, G; Forrest, R; Forrester, S; Franklin, M; Freeman, J C; Furic, I; Gallinaro, M; Galyardt, J; García, J E; Garberson, F; Garfinkel, A F; Gay, C; Gerberich, H; Gerdes, D; Giagu, S; Giannetti, P; Gibson, K; Gimmell, J L; Ginsburg, C; Giokaris, N; Giordani, M; Giromini, P; Giunta, M; Giurgiu, G; Glagolev, V; Glenzinski, D; Gold, M; Goldschmidt, N; Goldstein, J; Golossanov, A; Gómez, G; Gómez-Ceballos, G; Goncharov, M; González, O; Gorelov, I; Goshaw, A T; Goulianos, K; Gresele, A; Grinstein, S; Grosso-Pilcher, C; Group, R C; Grundler, U; Guimarães da Costa, J; Gunay-Unalan, Z; Haber, C; Hahn, K; Hahn, S R; Halkiadakis, E; Hamilton, A; Han, B Y; Han, J Y; Handler, R; Happacher, F; Hara, K; Hare, D; Hare, M; Harper, S; Harr, R F; Harris, R M; Hartz, M; Hatakeyama, K; Hauser, J; Hays, C; Heck, M; Heijboer, A; Heinemann, B; Heinrich, J; Henderson, C; Herndon, M; Heuser, J; Hidas, D; Hill, C S; Hirschbuehl, D; Höcker, A; Holloway, A; Hou, S; Houlden, M; Hsu, S C; Huffman, B T; Hughes, R E; Husemann, U; Huston, J; Incandela, J; Introzzi, G; Iori, M; Ivanov, A; Iyutin, B; James, E; Jang, D; Jayatilaka, B; Jeans, D; Jeon, E J; Jindariani, S; Johnson, W; Jones, M; Joo, K K; Jun, S Y; Jung, J E; Junk, T R; Kamon, T; Karchin, P E; Kato, Y; Kemp, Y; Kephart, R; Kerzel, U; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kimura, N; Kirsch, L; Klimenko, S; Klute, M; Knuteson, B; Ko, B R; Kondo, K; Kong, D J; Konigsberg, J; Korytov, A; Kotwal, A V; Kraan, A C; Kraus, J; Kreps, M; Kroll, J; Krumnack, N; Kruse, M; Krutelyov, V; Kubo, T; Kuhlmann, S E; Kuhr, T; Kulkarni, N P; Kusakabe, Y; Kwang, S; Laasanen, A T; Lai, S; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; Lazzizzera, I; LeCompte, T; Lee, J; Lee, J; Lee, Y J; Lee, S W; Lefèvre, R; Leonardo, N; Leone, S; Levy, S; Lewis, J D; Lin, C; Lin, C S; Lindgren, M; Lipeles, E; Lister, A; Litvintsev, D O; Liu, T; Lockyer, N S; Loginov, A; Loreti, M; Lu, R S; Lucchesi, D; Lujan, P; Lukens, P; Lungu, G; Lyons, L; Lys, J; Lysak, R; Lytken, E; Mack, P; MacQueen, D; Madrak, R; Maeshima, K; Makhoul, K; Mäki, T; Maksimovic, P; Malde, S; Malik, S; Manca, G; Manousakis, A; Margaroli, F; Marginean, R; Marino, C; Marino, C P; Martin, A; Martin, M; Martin, V; Martínez, M; Martinez-Ballarin, R; Maruyama, T; Mastrandrea, P; Masubuchi, T; Matsunaga, H; Mattson, M E; Mazini, R; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Mehtälä, P; Menzemer, S; Menzione, A; Merkel, P; Mesropian, C; Messina, A; Miao, T; Miladinovic, N; Miles, J; Miller, R; Mills, C; Milnik, M; Mitra, A; Mitselmakher, G; Miyamoto, A; Moed, S; Moggi, N; Mohr, B; Moon, C S; Moore, R; Morello, M; Movilla-Fernández, P A; Mülmenstädt, J; Mukherjee, A; Müller, T; Mumford, R; Murat, P; Mussini, M; Nachtman, J; Nagano, A; Naganoma, J; Nakamura, K; Nakano, I; Napier, A; Necula, V

2007-01-01

266

Constraints on dark matter models from a Fermi LAT search for high-energy cosmic-ray electrons from the Sun  

International Nuclear Information System (INIS)

During its first year of data taking, the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope has collected a large sample of high-energy cosmic-ray electrons and positrons (CREs). We present the results of a directional analysis of the CRE events, in which we searched for a flux excess correlated with the direction of the Sun. Two different and complementary analysis approaches were implemented, and neither yielded evidence of a significant CRE flux excess from the Sun. We derive upper limits on the CRE flux from the Sun's direction, and use these bounds to constrain two classes of dark matter models which predict a solar CRE flux: (1) models in which dark matter annihilates to CREs via a light intermediate state, and (2) inelastic dark matter models in which dark matter annihilates to CREs.

2011-08-01

267

"Do Users Do What They Think They Do?"- A Comparative Study of User Perceived and Actual Information Searching Behaviour in the National Electronic Library of Infection  

Science.gov (United States)

In the last decade, the Internet has profoundly changed the delivery of healthcare. Medical websites for professionals and patients are playing an increasingly important role in providing the latest evidence-based knowledge for professionals, facilitating virtual patient support groups, and providing an invaluable information source for patients. Information seeking is the key user activity on the Internet. However, the discrepancy between what information is available and what the user is able to find has a profound effect on user satisfaction. The UK National electronic Library of Infection (NeLI, www.neli.org.uk) and its subsidiary projects provide a single-access portal for quality-appraised evidence in infectious diseases. We use this national portal, as test-bed for investigating our research questions. In this paper, we investigate actual and perceived user navigation behaviour that reveals important information about user perceptions and actions, in searching for information. Our results show: (i) all users were able to access information they were seeking; (ii) broadly, there is an agreement between "reported" behaviour (from questionnaires) and "observed" behaviour (from web logs), although some important differences were identified; (iii) both browsing and searching were equally used to answer specific questions and (iv) the preferred route for browsing for data on the NeLI website was to enter via the "Top Ten Topics" menu option. These findings provide important insights into how to improve user experience and satisfaction with health information websites.

Roy, Anjana; Kostkova, Patty; Catchpole, Mike; Carson, Ewart

268

Professional Microsoft search fast search, Sharepoint search, and search server  

CERN Multimedia

Use Microsoft's latest search-based technology-FAST search-to plan, customize, and deploy your search solutionFAST is Microsoft's latest intelligent search-based technology that boasts robustness and an ability to integrate business intelligence with Search. This in-depth guide provides you with advanced coverage on FAST search and shows you how to use it to plan, customize, and deploy your search solution, with an emphasis on SharePoint 2010 and Internet-based search solutions.With a particular appeal for anyone responsible for implementing and managing enterprise search, this book presents t

Bennett, Mark; Kehoe, Miles; Voskresenskaya, Natalya

2010-01-01

269

Search for evidence of two-photon exchange in new experimental high momentum transfer data on electron deuteron elastic scattering  

Energy Technology Data Exchange (ETDEWEB)

The possible contribution of two-photon exchange to electron deuteron elastic scattering at relatively high momentum transfer is discussed. This study was motivated by the high precision data recently obtained at the Jefferson Laboratory. Using general arguments, based on crossing symmetry for the processes e{sup {minus}}+h{r_arrow}e{sup {minus}}+h and e{sup +}+e{sup {minus}}{r_arrow}h+{bar h}, we find a parametrization for the angular dependence of the interference between the one- and two-photon exchanges in the differential cross section for elastic ed scattering in terms of a new kinematical variable and compare our findings to the recent data. {copyright} {ital 1999} {ital The American Physical Society}

Rekalo, M.P. [Middle East Technical University, Physics Department, Ankara 06531 (Turkey); Tomasi-Gustafsson, E. [DAPNIA/SPhN, C.E.A./Saclay, F-91191 Gif-sur-Yvette Cedex (France); Prout, D. [Kent State University, Kent, Ohio 44242 (United States)

1999-10-01

270

Searching for seismo-ionospheric earthquakes precursors: Total Electron Content disturbances before 2005-2006 seismic events  

CERN Multimedia

During earthquakes preparation periods significant disturbances in the ionospheric plasma density are often observed. These anomalies are caused by lithosphere-atmosphere-ionosphere interaction, particularly by the seismic electric field penetrating from the ground surface into the ionosphere. The seismic electric field produces electromagnetic EB drift changing plasma density over the epicenter region and magnetically conjugated area. The paper is devoted to analysis of regular Global Positioning System observations and revelation of seismo-ionospheric precursors of earthquakes in Total Electron Content (TEC) of the ionosphere. Global and regional relative TEC disturbances maps (%) have been plotted for 2005-2006 M6, D<60 km seismic events and analyzed in order to determine general features of precursors. The obtained results agree with the recent published case-study investigations.

Romanovskaya, Yu V; Zolotov, O V; Starikova, N A; Lopatiy, V Z

2012-01-01

271

Picosecond spectroscopic search for electron transfer reactions in dimeric and trimeric reaction center models containing pyrochlorophyll/sub a/  

Energy Technology Data Exchange (ETDEWEB)

To further understanding of the light driven electron transfer reactions found in natural photosystems, dimeric and trimeric model molecules containing PChl/sub a/ were studied. The potential donor and acceptor subunits were covalently linked to form a single large molecule. The distance between the donor and acceptor subunits was altered by using both 10 atom and 5 atom chains. The effects of altering the relative orientation of the donor and acceptor were probed by contrasting the kinetics observed with added pyridine to those observed with added alcohol. Solvent dielectric (epsilon) effects were studied by using three solvents: toluene (epsilon = 2), CH/sub 2/Cl/sub 2/ (epsilon = 9) and CH/sub 3/CN (epsilon = 39). Finally, the redox span of the potential photoproducts was also varied. Results are presented and discussed. Both PChl/sub a/ and PPheo/sub a/ give essentially the same fluorescence yield in the three solvents used, approx. 100 arbitrary counts.

Netzel, T L; Bucks, R R; Boxer, S G; Fujita, I

1980-01-01

272

Searching for cavities of various densities in the Earth's crust with a low-energy electron-antineutrino beta-beam  

CERN Document Server

We propose searching for deep underground cavities of different densities in the Earth's crust using a long-baseline electron-antineutrino disappearance experiment, realised through a low-energy beta-beam with highly enhanced luminosity. We focus on four real-world cases: water-filled cavities, iron-banded formations, heavier mineral deposits, and regions of abnormal charge accumulation that, supposedly, appear prior to the occurrence of an intense earthquake. The sensitivity to identify cavities attains confidence levels higher than 3$\\sigma$ and 5$\\sigma$ for exposures times of 3 months and 1.5 years, respectively, and cavity densities below 1 g cm$^{-3}$ or above 5 g cm$^{-3}$, with widths greater than 200 km. We reconstruct the cavity density, width, and position, assuming one of them known while keeping the other two free, in each of the aforementioned cases. Finally, we introduce an observable to quantify the presence of a cavity by changing the orientation of the electron-antineutrino beam.

Argüelles, C A; Gago, A M

2012-01-01

273

Search Engine  

UK PubMed Central (United Kingdom)

this article, we sketch techniques which are used to build search engines. We concentrate on search engines involving texts only as searching involving other forms of media such as images and videos is still in its infancy.

Clement Yu

274

Electronics  

CERN Document Server

Although most people would scarcely be able to make it through the day without using some type of electronic device-computers, televisions, and MP3 players, to name a few-the inner workings of such devices remain a mystery to many. This insightful volume examines various components, such as electron tubes and semiconductors, that have been essential to electronics over the years, as well as the history of the field in general and its applications in everyday life.

Hollar, Sherman

2012-01-01

275

Electronics  

CERN Multimedia

Electronics Theory and Practice introduces the key areas of analog electronics through practicals, worked examples and concise explanations. The author is a senior lecturer at De Montfort University and his approach is a proven way of teaching the essentials of electronics to groups with a variety of academic backgrounds. This is an ideal text for first year modules and HNC/D units - comprehensive, concise and affordable.

Mesias, Gerardo

2012-01-01

276

Analysis of Influence of micro-EDM Parameters on MRR, TWR and Ra in Machining Ni-Ti Shape Memory Alloy  

Directory of Open Access Journals (Sweden)

Full Text Available In the micro-machining and MEMS industry, micro-Electrical discharge machining (?-EDM) is an important process. In this paper, the Taguchi design approach has been employed to investigate the micro-EDM parameters in order to achieve the highest Material Removal Rate (MRR), good surface quality and low Tool Wear Rate (TWR) while machining Ni-Ti based Shape Memory Alloy (SMA). Based on these investigations, it has been observed that MRR is highly influenced by capacitance, discharge voltage and depends upon electrode material. TWR and Ra were found to be better at low energy levels. Tungsten electrode is recommended for better surface roughness and brass electrode for better MRR. SEM images have been used to observe the dimensional accuracy of micro-holes produced.

Mohammed Sarvar Rasheed; A. M. Al-Ahmari; A. M. El-Tamimi; Mustufa H. Abidi

2012-01-01

277

Study os associated production of an electron and jets in the UA1 experiment: search for the top quark  

International Nuclear Information System (INIS)

We attempt to find evidence for top quark production in proton-antiproton interactions at 630 GeV center of mass energy. We use the semi-leptonic decay signature: presence of a high transverse energy electron accompanied by jets. The rate and the properties of the events originating from the known processes and from the misidentified-hadron background are estimated, the former using Monte-Carlo algorithms fitted to real data, the latter by an original method based on the data themselves. A good agreement is observed between these predictions and the data. This allows us to set limits on the QCD top quark production cross-section and the top quark mass. We obtain, for an ''average'' theoretical cross-section, that this mass should be greater than 38 GeV, at the 95% confidence level; the systematic experimental uncertainties on this limit are about 4 GeV. This improves the present limit of 23.3 GeV. Beside this, we show that if the top quark mass is of the order of, or greater than, the W mass, there is a perfectly clear signature of its production, and we study the peculiar kinematics and dynamics relevant to this case. Using the measurement of the lepton pair production cross-sections via W and Z boson decays, we show that it is possible, in principle, to set an upper limit on the top quark mass, but that, in practice, the present knowledge of the proton structure functions is too poor to allow us to set such a limit.

1988-01-01

278

Electronics  

CERN Multimedia

Careers in Focus: Electronics profiles 20 careers in this innovative field for young professionals. Job profiles of this title include: avionics engineers; computer-aided design drafters and technicians; cost estimators; electricians; electronics service technicians; hardware engineers; industrial engineers; microelectronics technicians; quality assurance testers; technical writers and editors; and, more.

Ferguson

2009-01-01

279

Search Patterns  

CERN Multimedia

What people are saying about Search Patterns "Search Patterns is a delight to read -- very thoughtful and thought provoking. It's the most comprehensive survey of designing effective search experiences I've seen." --Irene Au, Director of User Experience, Google "I love this book! Thanks to Peter and Jeffery, I now know that search (yes, boring old yucky who cares search) is one of the coolest ways around of looking at the world." --Dan Roam, author, The Back of the Napkin (Portfolio Hardcover) "Search Patterns is a playful guide to the practical concerns of search interface design. It cont

Morville, Peter

2010-01-01

280

Search for a heavy gauge boson W ' in the final state with an electron and large missing transverse energy in pp collisions at root s=7 TeV  

Digital Repository Infrastructure Vision for European Research (DRIVER)

A search for a heavy gauge boson W' has been conducted by the CMS experiment at the LHC in the decay channel with an electron and large transverse energy imbalance E-T(miss), using proton-proton collision data corresponding to an integrated luminosity of 36 pb(-1). No excess above standard model exp...

Khachatryan, V; Sirunyan, AM; Tumasyan, A; Adam, W; Bergauer, T; Dragicevic, M; Ero, J; Fabjan, C; Friedl, M; Fruhwirth, R

 
 
 
 
281

Search for a heavy gauge boson W' in the final state with an electron and large missing transverse energy in pp collisions at sqrt(s) = 7 TeV  

Digital Repository Infrastructure Vision for European Research (DRIVER)

A search for a heavy gauge boson W' has been conducted by the CMS experiment at the LHC in the decay channel with an electron and large transverse energy imbalance, using proton-proton collision data corresponding to an integrated luminosity of 36 inverse picobarns. No excess above standard model ex...

Chatrchyan, S; Khachatryan, V; Sirunyan, A; Tumasyan, A; Adam, W; Bergauer, T; Dragicevic, M; Erö, J; Fabjan, C; Friedl, M

282

Numerical study of the dielectric liquid around an electrical discharge generated vapor bubble in ultrasonic assisted EDM.  

UK PubMed Central (United Kingdom)

In electrical discharge machining due to the electrical current, very small bubbles are created in the dielectric fluid between the tool and the workpiece. Increase of the number of bubbles and their growth in size generate a single bubble. The bubble has an important role in electrical discharge machining. In this paper the effect of ultrasonic vibration of the tool and the velocity fields and pressure distribution in the dielectric fluid around the bubble in the process of electrical discharge machining are studied numerically. The boundary integral equation method is applied for the numerical solution of the problem. It is shown that ultrasonic vibration of the tool has great influence on the evolution of the bubble, fluid behavior and the efficiency of the machining in EDM. At the last stages of the collapse phase of the bubble, a liquid jet develops on the bubble which has different shapes. Due to the different cases, and a high pressure region appears just near the jet of the bubble. Also the fluid particles have the highest relative velocity just near the liquid jet of the bubble.

Shervani-Tabar MT; Mobadersany N

2013-07-01

283

Analysis of medium-term economic development and energy consumptions through the Eureca-Explor-EDM model chain. Final report  

Energy Technology Data Exchange (ETDEWEB)

In this report the macroeconomic and sectorial results obtained through a series of Explor-EDM runs are described; their achievement also required the introduction of some innovations in the data banks. Throughout this work some exogenous variables in the Explor model data bank were focused, which now require up-dating and new calibration. The re-structuring work of the data bank as a whole already got started, and new simulation tests will be performed after its completion. The main innovations required are as follows: (1) introduction of the new macroeconomic assumptions worked out by the EEC through the Eureca model; (2) introduction of the new historic sequence of energy consumptions. In particular: gases were subdivided into natural gas and other gases; the consumptions arising from industrial transports were separated from the industrial consumptions and classified under 'transports'; the historic sequence of consumptions was prolonged till 1979; (3) introduction of the new econometric estimates. (Copyright (c) ECSC-EEG-EAEC Brussels-Luxembourg 1983.)

Merzagora, N.

1983-01-01

284

Managing Systematic Errors in a Polarimeter for the Storage Ring EDM Experiment  

Science.gov (United States)

The EDDA plastic scintillator detector system at the Cooler Synchrotron (COSY) has been used to demonstrate that it is possible using a thick target at the edge of the circulating beam to meet the requirements for a polarimeter to be used in the search for an electric dipole moment on the proton or deuteron. Emphasizing elastic and low Q-value reactions leads to large analyzing powers and, along with thick targets, to efficiencies near 1%. Using only information obtained comparing count rates for oppositely vector-polarized beam states and a calibration of the sensitivity of the polarimeter to rate and geometric changes, the contribution of systematic errors can be suppressed below the level of one part per million.

Stephenson, Edward J.; Storage Ring EDM Collaboration

2011-05-01

285

Search for WH production with a light Higgs boson decaying to prompt electron-jets in proton-proton collisions at \\sqrt {s}=7 TeV with the ATLAS detector  

Science.gov (United States)

A search is performed for WH production with a light Higgs boson decaying to hidden-sector particles resulting in clusters of collimated electrons, known as electron-jets. The search is performed with 2.04 fb-1 of data collected in 2011 with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at \\sqrt {s}=7\\,{ { TeV}} . One event satisfying the signal selection criteria is observed, which is consistent with the expected background rate. Limits on the product of the WH production cross section and the branching ratio of a Higgs boson decaying to prompt electron-jets are calculated as a function of a Higgs boson mass in the range from 100 to 140 GeV.

Aad, G.; Abajyan, T.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdelalim, A. A.; Abdinov, O.; Aben, R.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Agustoni, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Alam, M. A.; Albert, J.; Albrand, S.; Aleksa, M.; Aleksandrov, I. N.; Alessandria, F.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Aliev, M.; Alimonti, G.; Alison, J.; Allbrooke, B. M. M.; Allison, L. J.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alonso, F.; Altheimer, A.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amelung, C.; Ammosov, V. V.; Amor Dos Santos, S. P.; Amorim, A.; Amoroso, S.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Anduaga, X. S.; Angelidakis, S.; Anger, P.; Angerami, A.; Anghinolfi, F.; Anisenkov, A.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoki, M.; Aoun, S.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J.-F.; Argyropoulos, S.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Ask, S.; Åsman, B.; Asquith, L.; Assamagan, K.; Astalos, R.; Astbury, A.; Atkinson, M.; Auerbach, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Axen, D.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Backus Mayes, J.; Badescu, E.; Bagnaia, P.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, S.; Balek, P.; Balli, F.; Banas, E.; Banerjee, P.; Banerjee, Sw; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barber, T.; Barberio, E. L.; Barberis, D.; Barbero, M.; Bardin, D. Y.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Bartoldus, R.; Barton, A. E.; Bartsch, V.; Basye, A.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, K.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Begel, M.; Behar Harpaz, S.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Benoit, M.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Berglund, E.; Beringer, J.; Bernat, P.; Bernhard, R.; Bernius, C.; Bernlochner, F. U.; Berry, T.; Bertella, C.; Bertin, A.; Bertolucci, F.; Besana, M. I.; Besjes, G. J.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianchini, L.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Biscarat, C.; Bittner, B.; Black, C. W.; Black, J. E.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blazek, T.; Bloch, I.; Blocker, C.; Blocki, J.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. S.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boek, T. T.; Boelaert, N.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Bohm, J.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bomben, M.; Bona, M.; Boonekamp, M.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borri, M.; Borroni, S.; Bortfeldt, J.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boutouil, S.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozovic-Jelisavcic, I.; Bracinik, J.; Branchini, P.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brazzale, S. F.; Brelier, B.; Bremer, J.; Brendlinger, K.; Brenner, R.; Bressler, S.; Bristow, T. M.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, T.; Brooks, W. K.; Brown, G.; Bruckman de Renstrom, P. A.; Bruncko, D.; Bruneliere, R.; Brunet, S.; Bruni, A.; Bruni, G.; Bruschi, M.; Bryngemark, L.; Buanes, T.; Buat, Q.

2013-04-01

286

Search for WH production with a light Higgs boson decaying to prompt electron-jets in proton-proton collisions at $\\sqrt{s}$=7 TeV with the ATLAS detector  

CERN Multimedia

A search is performed for WH production with a light Higgs boson decaying to hidden-sector particles resulting in clusters of collimated electrons, known as electron-jets. The search is performed with 2.04 fb-1 of data collected in 2011 with the ATLAS detector at the LHC in proton-proton collisions at $\\sqrt{s}$=7 TeV. One event satisfying the signal selection criteria is observed, which is consistent with the expected background rate. Limits on the product of the WH production cross section and the branching ratio of a Higgs boson decaying to prompt electron-jets are calculated as a function of a Higgs boson mass in the range from 100 GeV to 140 GeV.

Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdel Khalek, Samah; Abdelalim, Ahmed Ali; Abdinov, Ovsat; Aben, Rosemarie; Abi, Babak; Abolins, Maris; AbouZeid, Ossama; Abramowicz, Halina; Abreu, Henso; Acharya, Bobby Samir; Adamczyk, Leszek; Adams, David; Addy, Tetteh; Adelman, Jahred; Adomeit, Stefanie; Adragna, Paolo; Adye, Tim; Aefsky, Scott; Aguilar-Saavedra, Juan Antonio; Agustoni, Marco; Ahlen, Steven; Ahles, Florian; Ahmad, Ashfaq; Ahsan, Mahsana; Aielli, Giulio; Åkesson, Torsten Paul Ake; Akimoto, Ginga; Akimov, Andrei; Alam, Muhammad Aftab; Albert, Justin; Albrand, Solveig; Aleksa, Martin; Aleksandrov, Igor; Alessandria, Franco; Alexa, Calin; Alexander, Gideon; Alexandre, Gauthier; Alexopoulos, Theodoros; Alhroob, Muhammad; Aliev, Malik; Alimonti, Gianluca; Alison, John; Allbrooke, Benedict; Allison, Lee John; Allport, Phillip; Allwood-Spiers, Sarah; Almond, John; Aloisio, Alberto; Alon, Raz; Alonso, Alejandro; Alonso, Francisco; Altheimer, Andrew David; Alvarez Gonzalez, Barbara; Alviggi, Mariagrazia; Amako, Katsuya; Amelung, Christoph; Ammosov, Vladimir; Amor Dos Santos, Susana Patricia; Amorim, Antonio; Amoroso, Simone; Amram, Nir; Anastopoulos, Christos; Ancu, Lucian Stefan; Andari, Nansi; Andeen, Timothy; Anders, Christoph Falk; Anders, Gabriel; Anderson, Kelby; Andreazza, Attilio; Andrei, George Victor; Anduaga, Xabier; Angelidakis, Stylianos; Anger, Philipp; Angerami, Aaron; Anghinolfi, Francis; Anisenkov, Alexey; Anjos, Nuno; Annovi, Alberto; Antonaki, Ariadni; Antonelli, Mario; Antonov, Alexey; Antos, Jaroslav; Anulli, Fabio; Aoki, Masato; Aoun, Sahar; Aperio Bella, Ludovica; Apolle, Rudi; Arabidze, Giorgi; Aracena, Ignacio; Arai, Yasuo; Arce, Ayana; Arfaoui, Samir; Arguin, Jean-Francois; Argyropoulos, Spyridon; Arik, Engin; Arik, Metin; Armbruster, Aaron James; Arnaez, Olivier; Arnal, Vanessa; Artamonov, Andrei; Artoni, Giacomo; Arutinov, David; Asai, Shoji; Ask, Stefan; Åsman, Barbro; Asquith, Lily; Assamagan, Ketevi; Astalos, Robert; Astbury, Alan; Atkinson, Markus; Auerbach, Benjamin; Auge, Etienne; Augsten, Kamil; Aurousseau, Mathieu; Avolio, Giuseppe; Axen, David; Azuelos, Georges; Azuma, Yuya; Baak, Max; Baccaglioni, Giuseppe; Bacci, Cesare; Bach, Andre; Bachacou, Henri; Bachas, Konstantinos; Backes, Moritz; Backhaus, Malte; Backus Mayes, John; Badescu, Elisabeta; Bagnaia, Paolo; Bai, Yu; Bailey, David; Bain, Travis; Baines, John; Baker, Oliver Keith; Baker, Sarah; Balek, Petr; Balli, Fabrice; Banas, Elzbieta; Banerjee, Piyali; Banerjee, Swagato; Banfi, Danilo; Bangert, Andrea Michelle; Bansal, Vikas; Bansil, Hardeep Singh; Barak, Liron; Baranov, Sergei; Barber, Tom; Barberio, Elisabetta Luigia; Barberis, Dario; Barbero, Marlon; Bardin, Dmitri; Barillari, Teresa; Barisonzi, Marcello; Barklow, Timothy; Barlow, Nick; Barnett, Bruce; Barnett, Michael; Baroncelli, Antonio; Barone, Gaetano; Barr, Alan; Barreiro, Fernando; Barreiro Guimarães da Costa, João; Bartoldus, Rainer; Barton, Adam Edward; Bartsch, Valeria; Basye, Austin; Bates, Richard; Batkova, Lucia; Batley, Richard; Battaglia, Andreas; Battistin, Michele; Bauer, Florian; Bawa, Harinder Singh; Beale, Steven; Beau, Tristan; Beauchemin, Pierre-Hugues; Beccherle, Roberto; Bechtle, Philip; Beck, Hans Peter; Becker, Anne Kathrin; Becker, Sebastian; Beckingham, Matthew; Becks, Karl-Heinz; Beddall, Andrew; Beddall, Ayda; Bedikian, Sourpouhi; Bednyakov, Vadim; Bee, Christopher; Beemster, Lars; Begel, Michael; Behar Harpaz, Silvia; Belanger-Champagne, Camille; Bell, Paul; Bell, William; Bella, Gideon; Bellagamba, Lorenzo; Bellomo, Massimiliano; Belloni, Alberto; Beloborodova, Olga; Belotskiy, Konstantin; Beltramello, Olga; Benary, Odette; Benchekroun, Driss; Bendtz, Katarina; Benekos, Nektarios; Benhammou, Yan; Benhar Noccioli, Eleonora; Benitez Garcia, Jorge-Armando; Benjamin, Douglas; Benoit, Mathieu; Bensinger, James; Benslama, Kamal; Bentvelsen, Stan; Berge, David; Bergeaas Kuutmann, Elin; Berger, Nicolas; Berghaus, Frank; Berglund, Elina; Beringer, Jürg; Bernat, Pauline; Bernhard, Ralf; Bernius, Catrin; Bernlochner, Florian Urs; Berry, Tracey; Bertella, Claudia; Bertin, Antonio; Bertolucci, Federico; Besana, Maria Ilaria; Besjes, Geert-Jan; Besson, Nathalie; Bethke, Siegfried; Bhimji, Wahid; Bianchi, Riccardo-Maria; Bianchini, Louis; Bianco, Michele; Biebel, Otmar; Bieniek, Stephen Paul; Bierwagen, Katharina; Biesiada, Jed; Biglietti, Michela; Bilokon, Halina; Bindi, Marcello; Binet, Sebastien; Bingul, Ahmet; Bini, Cesare; Biscarat, Catherine; Bittner, Bernhard; Black, Curtis; Black, James; Black, Kevin; Blair, Robert

2013-01-01

287

Savvy Searching.  

Science.gov (United States)

Explains desktop metasearch engines, which search the databases of several search engines simultaneously. Reviews two particular versions, the Copernic 2001 Pro and the BullsEye Pro 3, comparing costs, subject categories, display capabilities, and layout for presenting results. (LRW)

Jacso, Peter

2002-01-01

288

Search Combinators  

CERN Multimedia

The ability to model search in a constraint solver can be an essential asset for solving combinatorial problems. However, existing infrastructure for defining search heuristics is often inadequate. Either modeling capabilities are extremely limited or users are faced with a general-purpose programming language whose features are not tailored towards writing search heuristics. As a result, major improvements in performance may remain unexplored. This article introduces search combinators, a lightweight and solver-independent method that bridges the gap between a conceptually simple modeling language for search (high-level, functional and naturally compositional) and an efficient implementation (low-level, imperative and highly non-modular). By allowing the user to define application-tailored search strategies from a small set of primitives, search combinators effectively provide a rich domain-specific language (DSL) for modeling search to the user. Remarkably, this DSL comes at a low implementation cost to the...

Schrijvers, Tom; Wuille, Pieter; Samulowitz, Horst; Stuckey, Peter J

2012-01-01

289

Lessons from the Electronic Data Methods Forum: collaboration at the frontier of comparative effectiveness research, patient-centered outcomes research, and quality improvement.  

UK PubMed Central (United Kingdom)

BACKGROUND: The Electronic Data Methods (EDM) Forum, with support from the Agency for Healthcare Research and Quality, exists to advance knowledge and practice on the use of electronic clinical data (ECD) for comparative effectiveness research, patient-centered outcomes research, and quality improvement (QI). The EDM Forum facilitates collaboration between the Prospective Outcome Systems using Patient-specific Electronic data to Compare Tests and therapies, Scalable Distributed Research Network, and Enhanced registry projects funded by Agency for Healthcare Research and Quality. OBJECTIVES: This overview describes a second set of papers commissioned by the EDM Forum, published in this supplement to Medical Care. The papers that are included discuss challenges and innovations from the research and QI community using ECD. CONCLUSIONS: The papers in this supplement provide lessons learned based on experiences building transparent, scalable, reusable networks for research and QI. Through these papers, and a new open access e-journal, eGEMs, the EDM Forum is working to advance the science of health research and QI using ECD to improve patient outcomes.

Holve E; Calonge N

2013-08-01

290

Partition search  

Energy Technology Data Exchange (ETDEWEB)

We introduce a new form of game search called partition search that incorporates dependency analysis, allowing substantial reductions in the portion of the tree that needs to be expanded. Both theoretical results and experimental data are presented. For the game of bridge, partition search provides approximately as much of an improvement over existing methods as {alpha}-{beta} pruning provides over minimax.

Ginsberg, M.L. [CIRL, Eugene, OR (United States)

1996-12-31

291

Search for minimal supergravity in single-electron events with jets and large missing transverse energy in pp-bar collisions at ?(s)=1.8 TeV  

International Nuclear Information System (INIS)

We describe a search for evidence of minimal supergravity (MSUGRA) in 92.7 pb-1 of data collected with the DOe detector at the Fermilab Tevatron pp-bar collider at ?(s)=1.8 TeV. Events with a single electron, four or more jets, and large missing transverse energy were used in this search. The major backgrounds are from W+jets, misidentified multijet, tt-bar, and WW production. We observe no excess above the expected number of background events in our data. A new limit in terms of MSUGRA model parameters is obtained.

2002-12-01

292

Clustering search  

Directory of Open Access Journals (Sweden)

Full Text Available This paper presents the Clustering Search (CS) as a new hybrid metaheuristic, which works in conjunction with other metaheuristics, managing the implementation of local search algorithms for optimization problems. Usually the local search is costly and should be used only in promising regions of the search space. The CS assists in the discovery of these regions by dividing the search space into clusters. The CS and its applications are reviewed and a case study for a problem of capacitated clustering is presented.

Alexandre César Muniz de Oliveira; Antonio Augusto Chaves; Luiz Antonio Nogueira Lorena

2013-01-01

293

Numerical study on the splitting of a vapor bubble in the ultrasonic assisted EDM process with the curved tool and workpiece.  

UK PubMed Central (United Kingdom)

Electrical discharge machining (EDM) is a powerful and modern method of machining. In the EDM process, a vapor bubble is generated between the tool and the workpiece in the dielectric liquid due to an electrical discharge. In this process dynamic behavior of the vapor bubble affects machining process. Vibration of the tool surface affects bubble behavior and consequently affects material removal rate (MRR). In this paper, dynamic behavior of the vapor bubble in an ultrasonic assisted EDM process after the appearance of the necking phenomenon is investigated. It is noteworthy that necking phenomenon occurs when the bubble takes the shape of an hour-glass. After the appearance of the necking phenomenon, the vapor bubble splits into two parts and two liquid jets are developed on the boundaries of the upper and lower parts of the vapor bubble. The liquid jet developed on the upper part of the bubble impinges to the tool and the liquid jet developed on the lower part of the bubble impinges to the workpiece. These liquid jets cause evacuation of debris from the gap between the tool and the workpiece and also cause erosion of the workpiece and the tool. Curved tool and workpiece affect the shape and the velocity of the liquid jets during splitting of the vapor bubble. In this paper dynamics of the vapor bubble after its splitting near the curved tool and workpiece is investigated in three cases. In the first case surfaces of the tool and the workpiece are flat, in the second case surfaces of the tool and the workpiece are convex and in the third case surfaces of the tool and workpiece are concave. Numerical results show that in the third case, the velocity of liquid jets which are developed on the boundaries of the upper and lower parts of the vapor bubble after its splitting have the highest magnitude and their shape are broader than the other cases.

Shervani-Tabar MT; Seyed-Sadjadi MH; Shabgard MR

2013-01-01

294

Electronics  

CERN Document Server

Owen Bishop's First Course starts with the basics of electricity and component types, introducing students to practical work almost straight away. No prior knowledge of electronics is required. The approach is student-centred with self-test features to check understanding, including numerous activities suitable for practicals, homework and other assignments. Multiple choice questions are incorporated throughout the text in order to aid student learning. Key facts, formulae and definitions are highlighted to aid revision, and theory is backed up by numerous examp

Bishop, Owen

2010-01-01

295

Search for a heavy gauge boson W' in the final state with an electron and large missing transverse energy in pp collisions at $\\sqrt{s}$ = 7 TeV  

CERN Multimedia

A search for a heavy gauge boson W' has been conducted by the CMS experiment at the LHC in the decay channel with an electron and large transverse energy imbalance, using proton-proton collision data corresponding to an integrated luminosity of 36 inverse picobarns. No excess above standard model expectations is seen in the transverse mass distribution of the electron-(missing E_T) system. Assuming standard-model-like couplings and decay branching fractions, a W' boson with a mass less than 1.36 TeV/$c^2$ is excluded at 95% confidence level.

Khachatryan, Vardan; Tumasyan, Armen; Adam, Wolfgang; Bergauer, Thomas; Dragicevic, Marko; Erö, Janos; Fabjan, Christian; Friedl, Markus; Fruehwirth, Rudolf; Ghete, Vasile Mihai; Hammer, Josef; Haensel, Stephan; Hartl, Christian; Hoch, Michael; Hörmann, Natascha; Hrubec, Josef; Jeitler, Manfred; Kasieczka, Gregor; Kiesenhofer, Wolfgang; Krammer, Manfred; Liko, Dietrich; Mikulec, Ivan; Pernicka, Manfred; Rohringer, Herbert; Schöfbeck, Robert; Strauss, Josef; Taurok, Anton; Teischinger, Florian; Waltenberger, Wolfgang; Walzel, Gerhard; Widl, Edmund; Wulz, Claudia-Elisabeth; Mossolov, Vladimir; Shumeiko, Nikolai; Suarez Gonzalez, Juan; Benucci, Leonardo; Cerny, Karel; De Wolf, Eddi A.; Janssen, Xavier; Maes, Thomas; Mucibello, Luca; Ochesanu, Silvia; Roland, Benoit; Rougny, Romain; Selvaggi, Michele; Van Haevermaet, Hans; Van Mechelen, Pierre; Van Remortel, Nick; Adler, Volker; Beauceron, Stephanie; Blekman, Freya; Blyweert, Stijn; D'Hondt, Jorgen; Devroede, Olivier; Gonzalez Suarez, Rebeca; Kalogeropoulos, Alexis; Maes, Joris; Maes, Michael; Tavernier, Stefaan; Van Doninck, Walter; Van Mulders, Petra; Van Onsem, Gerrit Patrick; Villella, Ilaria; Charaf, Otman; Clerbaux, Barbara; De Lentdecker, Gilles; Dero, Vincent; Gay, Arnaud; Hammad, Gregory Habib; Hreus, Tomas; Marage, Pierre Edouard; Thomas, Laurent; Vander Velde, Catherine; Vanlaer, Pascal; Wickens, John; Costantini, Silvia; Grunewald, Martin; Klein, Benjamin; Marinov, Andrey; Mccartin, Joseph; Ryckbosch, Dirk; Thyssen, Filip; Tytgat, Michael; Vanelderen, Lukas; Verwilligen, Piet; Walsh, Sinead; Zaganidis, Nicolas; Basegmez, Suzan; Bruno, Giacomo; Caudron, Julien; Ceard, Ludivine; De Favereau De Jeneret, Jerome; Delaere, Christophe; Demin, Pavel; Favart, Denis; Giammanco, Andrea; Grégoire, Ghislain; Hollar, Jonathan; Lemaitre, Vincent; Liao, Junhui; Militaru, Otilia; Ovyn, Severine; Pagano, Davide; Pin, Arnaud; Piotrzkowski, Krzysztof; Schul, Nicolas; Beliy, Nikita; Caebergs, Thierry; Daubie, Evelyne; Alves, Gilvan; De Jesus Damiao, Dilson; Pol, Maria Elena; Henrique Gomes E Souza, Moacyr; Carvalho, Wagner; Da Costa, Eliza Melo; De Oliveira Martins, Carley; Fonseca De Souza, Sandro; Mundim, Luiz; Nogima, Helio; Oguri, Vitor; Prado Da Silva, Wanda Lucia; Santoro, Alberto; Silva Do Amaral, Sheila Mara; Sznajder, Andre; De Almeida Dias, Flavia; Ferreira Dias, Marco Andre; Tomei, Thiago; De Moraes Gregores, Eduardo; Da Cunha Marinho, Franciole; Novaes, Sergio F.; Padula, Sandra; Darmenov, Nikolay; Dimitrov, Lubomir; Genchev, Vladimir; Iaydjiev, Plamen; Piperov, Stefan; Rodozov, Mircho; Stoykova, Stefka; Sultanov, Georgi; Tcholakov, Vanio; Trayanov, Rumen; Vankov, Ivan; Dyulendarova, Milena; Hadjiiska, Roumyana; Kozhuharov, Venelin; Litov, Leander; Marinova, Evelina; Mateev, Matey; Pavlov, Borislav; Petkov, Peicho; Bian, Jian-Guo; Chen, Guo-Ming; Chen, He-Sheng; Jiang, Chun-Hua; Liang, Dong; Liang, Song; Wang, Jian; Wang, Jian; Wang, Xianyou; Wang, Zheng; Xu, Ming; Yang, Min; Zang, Jingjing; Zhang, Zhen; Ban, Yong; Guo, Shuang; Guo, Yifei; Li, Wenbo; Mao, Yajun; Qian, Si-Jin; Teng, Haiyun; Zhang, Linlin; Zhu, Bo; Zou, Wei; Cabrera, Andrés; Gomez Moreno, Bernardo; Ocampo Rios, Alberto Andres; Osorio Oliveros, Andres Felipe; Sanabria, Juan Carlos; Godinovic, Nikola; Lelas, Damir; Lelas, Karlo; Plestina, Roko; Polic, Dunja; Puljak, Ivica; Antunovic, Zeljko; Dzelalija, Mile; Brigljevic, Vuko; Duric, Senka; Kadija, Kreso; Morovic, Srecko; Attikis, Alexandros; Galanti, Mario; Mousa, Jehad; Nicolaou, Charalambos; Ptochos, Fotios; Razis, Panos A.; Rykaczewski, Hans; Assran, Yasser; Mahmoud, Mohammed; Hektor, Andi; Kadastik, Mario; Kannike, Kristjan; Müntel, Mait; Raidal, Martti; Rebane, Liis; Azzolini, Virginia; Eerola, Paula; Czellar, Sandor; Härkönen, Jaakko; Heikkinen, Mika Aatos; Karimäki, Veikko; Kinnunen, Ritva; Klem, Jukka; Kortelainen, Matti J.; Lampén, Tapio; Lassila-Perini, Kati; Lehti, Sami; Lindén, Tomas; Luukka, Panja-Riina; Mäenpää, Teppo; Tuominen, Eija; Tuominiemi, Jorma; Tuovinen, Esa; Ungaro, Donatella; Wendland, Lauri; Banzuzi, Kukka; Korpela, Arja; Tuuva, Tuure; Sillou, Daniel; Besancon, Marc; Choudhury, Somnath; Dejardin, Marc; Denegri, Daniel; Fabbro, Bernard; Faure, Jean-Louis; Ferri, Federico; Ganjour, Serguei; Gentit, François-Xavier; Givernaud, Alain; Gras, Philippe; Hamel de Monchenault, Gautier; Jarry, Patrick; Locci, Elizabeth; Malcles, Julie; Marionneau, Matthieu; Millischer, Laurent; Rander, John; Rosowsky, André; Shreyber, Irina; Titov, Maksym; Verrecchia, Patrice; Baffioni, Stephanie; Beaudette, Florian; Bianchini, Lorenzo

2011-01-01

296

A measurement of hadron production cross sections for the simulation of accelerator neutrino beams and a search for muon-neutrino to electron-neutrino oscillations in the delta m**2 about equals 1-eV**2 region  

Energy Technology Data Exchange (ETDEWEB)

A measurement of hadron production cross-sections for the simulation of accelerator neutrino beams and a search for muon neutrino to electron neutrino oscillations in the {Delta}m{sup 2} {approx} 1 eV{sup 2} region. This dissertation presents measurements from two different high energy physics experiments with a very strong connection: the Hadron Production (HARP) experiment located at CERN in Geneva, Switzerland, and the Mini Booster Neutrino Experiment (Mini-BooNE) located at Fermilab in Batavia, Illinois.

Schmitz, David W.; /Columbia U.

2008-01-01

297

Faceted Search  

CERN Multimedia

We live in an information age that requires us, more than ever, to represent, access, and use information. Over the last several decades, we have developed a modern science and technology for information retrieval, relentlessly pursuing the vision of a "memex" that Vannevar Bush proposed in his seminal article, "As We May Think." Faceted search plays a key role in this program. Faceted search addresses weaknesses of conventional search approaches and has emerged as a foundation for interactive information retrieval. User studies demonstrate that faceted search provides more

Tunkelang, Daniel

2009-01-01

298

Search for the Neutron Electric Dipole Moment: Contributions from the Triangle Universities Nuclear Laboratory  

CERN Document Server

A significant fraction of the research effort at the Triangle Universities Nuclear Laboratory (TUNL) focuses on weak interaction studies and searches for physics beyond the Standard Model. One major effort is the development of a new experimental technique to search for the neutron electric dipole moment (nEDM) that offers the potential for a factor of 100 increase in sensitivity over existing measurements. The search for this moment has the potential to reveal new sources of time reversal (T) and charge-conjugation-and-parity (CP) violation and to challenge calculations that propose extensions to the Standard Model. We provide a brief overview of the experiment as a whole and discuss the work underway at TUNL as part of this effort.

Huffman, P R; Gould, C R; Haase, D G; Kendellen, D P; Korobkina, E; Swank, C M; Young, A R; Ahmed, M W; Busch, M; Gao, H; Zhang, Y; Zheng, W Z; Ye, Q

2011-01-01

299

Searches for new physics  

International Nuclear Information System (INIS)

[en] The CERN p bar p Collider has been the first accelerator to operate in a completely new energy domain, reaching center-of-mass energies an order of magnitude larger than those previously available with the intersecting Storage Rings (ISR) at CERN, or with the Positron-Electron Tandem Ring Accelerator (PETRA) at DESY and the Positron-Electron Project (PEP) at SLAC. Naturally there has been great interest in the searches for new physics in this virgin territory. Theorists have approached these searches from either or both of two rival points of view. Either they have had an a priori prejudice as to what new physics should be searched for, and what its signatures should be, or they have tried to interpret a posteriori some experimental observations. The basic building-blocks of new physics in the 100 GeV energy domain are jets j, charged leptons l, photons ?, and missing transverse energy ET. Therefore searches have been conducted in channels which are combinations of these elements. It also shows some of the main a priori theoretical prejudices which can be explored in each of these channels. The layout of the rest of this paper is as follows. There are sections discussing each of the major prejudices: the Standard Model supersymmetry; extra gauge degrees of freedom; composite models; and other possibilities. Each of these sections contains a description of the motivations and characteristics of the new physics to be searched for, followed by a review of the searches made up to now at the CERN p bar p Collider. Finally, it summarizes the lessons to be learnt so far from searches for new physics at the CERN p bar p Collider, and previews some of the prospects for the next rounds of collider searches at CERN and FNAL

1989-01-01

300

Investigação no contexto brasileiro sobre gestão do conhecimento/aprendizagem/tecnologia de informação: pesquisa realizada na Scientific Electronic Library Online/ Research in Brazilian context about knowledge management / learning / information technology: search conducted in Scientific Electronic Library Online  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese Este artigo investiga a produção científica sobre gestão do conhecimento/aprendizagem/tecnologia de informação por meio de pesquisa na Scientific Electronic Library Online. Primeiro de tudo, foram encontrados 194 artigos que abordavam esses termos separadamente. Num segundo momento, dos 194 artigos foram selecionados 49 que tratavam da gestão do conhecimento organizacional, enfocando o processo e o nível de aprendizagem e utilizando ferramentas de tecnologia de in (more) formação. Nestes 49 artigos foi aplicada a classificação de aprendizagem proposta por Pawlowsky, Forslin e Reinhardt (2003), o que possibilitou selecionar oito artigos que apresentavam um maior número de ocorrências relativas à classificação. Por fim, esses oito artigos foram mapeados, constatando-se que a gestão do conhecimento organizacional se refere a um processo de mudança cultural, e que a aprendizagem é um elemento essencial a ser apoiado por ferramentas de tecnologia de informação. Essa constatação possibilitou ainda o entendimento de que (i) a tecnologia de informação pode auxiliar na gestão do conhecimento como um todo (alavancando, conduzindo e direcionando), e (ii) de que é necessário adaptar a tecnologia de informação ao contexto organizacional. Abstract in english This article investigates the scientific production of knowledge management/learning/technology of information, through search carried out in the Scientific Electronic Library Online. Initially, we analyzed 194 articles that discuss the terms individually and selected 49 articles that addressed the management of organizational knowledge, focusing on the process and the level of organizational learning and the use of information technology tools. In these 49 articles, the (more) classification proposed by Pawlowsky et al. (2003) about organizational learning has been applied. This procedure allowed the selection of 8 articles, which had a higher number of incidents relating to the classification. Finally, these 8 articles were mapped and, as a result, it was found that the perception that the organizational knowledge management refers to a process of cultural change and that learning is a key element to be supported by information technology tools has been confirmed. These conclusions allowed the following understandings: i) the possibility of information technology assists in the management of knowledge as a whole (lever, leads and directs), and (ii) the need to adapt the information technology to the organizational context.

Igarashi, Wagner; Igarashi, Deisy Cristina Corrêa; Vieira, Eleonora Milano Falcão; Todesco, José Leomar

2008-06-01

 
 
 
 
301

Search for right-handed W{sup {+-}} decays into two electrons and two jets with the ATLAS detector at LHC  

Energy Technology Data Exchange (ETDEWEB)

The discovery potential to observe right-handed W gauge bosons in the decay mode to two electrons and two jets is discussed. A right-handed W can decay semileptonically into an electron and a right-handed neutrino. If it is massive enough, this neutrino decays to an electron and a quark-antiquark pair. (author).

Wielers, M. [Grenoble-1 Univ., 38 (France). Inst. des Sciences Nucleaires

1996-12-01

302

Electronic Publishing Trust for Development  

Indian Academy of Sciences (India)

electronic publishing trust for development electronic publishing trust for development electronic publishing trust for development electronic publishing trust for development electronic publishing trust for development electronic publishing trust for development electronic publishing trust for development electronic publishing trust for development electronic publishing trust for development blank for more searches ele ...

303

Online Searching  

UK PubMed Central (United Kingdom)

We consider the problem of searching m branches which, with theexception of a common source s, are disjoint (hereafter called concurrentbranches). A searcher, starting at s, must find a given "exit" twhose location, unknown to the searcher, is on one of the m branches.The problem is to find a strategy that minimizes the worst case ratiobetween the total distance traveled and the length of the shortest pathfrom s to t. Additional information may be available to the searcherbefore he begins his search.In addition to finding optimal or near optimal deterministic onlinealgorithms for these problems this paper addresses the "value" ofgetting additional information before starting the search.Keywords: online search, incomplete information, value of information# Research funded in part by ONR, grants N00014-94-1-0257 and N00014-96-1-0190, andNSF, grant DMI-9713682. Second author also wishes to thank SBC Technology Resourcesfor its generous support.# MSIS Department and Civil ...

Patrick Jaillet; Matthew Staord

304

Status of the experiment on the laboratory search for the electron antineutrino magnetic moment at the level ?? <- 3 × 10-12?B  

Science.gov (United States)

The experiment on the direct detection of antineutrino-electron scattering using an artificial tritium source of 40 MCi activity aims at essential improvement of the laboratory limit for the electron antineutrino magnetic moment. The planned sensitivity allows achieving the level ?? Julich, Germany.

Bogdanova, L. N.

2003-06-01

305

Status of the Experiment on the Laboratory Search for the Electron Antineutrino Magnetic Moment with a 40-MCi Tritium Source (MAMONT)  

International Nuclear Information System (INIS)

The MAMONT experiment on the direct detection of antineutrino-electron scattering using an artificial tritium source of 40 MCi activity aims at establishing a stringent laboratory limit ??-bar (1-bar 3)-bar 10-12?B for the electron antineutrino magnetic moment during 1-2 years of data acquisition. The current status of R and D is presented.

2005-01-01

306

Search for the 1+ state of copper in the electron'' superconductor Nd sub 2 minus x Ce sub x CuO sub 4  

Energy Technology Data Exchange (ETDEWEB)

We used the resonant photoemission technique to search for Cu{sup 1+} resonances in the spectra of superconducting and non-superconducting compounds in the Nd{sub 2{minus}{ital x}}Ce{sub {ital x}}CuO{sub 4} family. No evidence for such resonances was found. The possible implications of this somewhat suprising result are discussed.

Terrasi, A.; Hwu, Y.; Rioux, D.; Marsi, M.; Chang, Y.; McKinley, J.T.; Onellion, M.; Margaritondo, G. (University of Wisconsin-Madison, Stoughton, WI (USA)); Capozi, M.; Quaresima, C.; Campo, A.; Ottaviani, C.; Perfetti, P. (Laboratorio di Struttura della Materia del CNR, Frascati (Italy)); Stoffel, N.G.; Wang, E. (Bellcore, 331 Newman Springs Road, Redbank, NJ (USA))

1990-01-25

307

Study of the motion of electrons in non polar classical liquids. Measurement of Hall effect and f.i.r. search for low energy traps. Progress report  

International Nuclear Information System (INIS)

[en] Progress is reported on experiments aimed at the measurement of the Hall mobility of injected electrons in classical non polar insulating liquids and the optical absorption associated with electrons captured by shallow traps in the liquefied rare gases. Theoretical work aimed at a better understanding of the trapping kinetics of electrons by SF6 and O2 dissolved in rare gas liquids was also carried out. Its conclusion is that the electric field dependence of the trapping probability can be explained, basically without adjustable parameters, by considering the Poole-Frenkel-Schotky ionization of the excited state of the traps. From the analysis of published data on the motion of electrons in liquid ethane it is tentatively concluded that at low temperatures the trapping of electrons in the liquid involves a Jahn-Teller like distortion of a single ethane molecule while at higher temperatures it is necessary to consider a small molecular cluster, possibly made up of 2 molecules

1981-01-01

308

Mechanisms of CP violation in gauge theory and the recent developments  

International Nuclear Information System (INIS)

Various mechanisms of CP violation in gauge theory are reviewed. We discuss the impact of recent developments associated with electric dipole moment(EDM) of neutron (Dn), EDM of quarks(Dq), chromo-EDM of quarks(Dqc), chromo-EDM of gluon(DGc), EDM of electron(De), and EDM of W boson(DW). 89 refs., 31 figs

1990-01-01

309

Experimental search for the permanent electric dipole moment of an Na atom using special capacitor in the shape of Dewar flask  

CERN Multimedia

Since the time of Rutherford it was commonly believed that with no electric field, the nucleus of an atom is at the centre of the electron cloud, so that all kinds of atoms do not have permanent electric dipole moment (EDM). In the fact, the idea is untested hypothesis. Using two special capacitors containing Sodium vapor we find the electric susceptibility Xe of Na atoms is directly proportional to its density N, and inversely to the absolute temperature T, as polar molecules. Xe=A+B/T, where A is approximately to zero, B=126.6 (K) and N=1.49*1020 m-3. A ground state neutral Na atom has a large permanent EDM: d( Na)=1.28*10-8e.cm. The non-zero observation of EDM in any non-degenerate system will be a direct proof of time-reversal violation in nature, and new example of CP violation occurred in Na atoms. We work out the most linear Stark shift of Na atoms is only 0.0033nm, and so its linear Stark effect has not been observed till now! The experimental Na material with purity 0.9995 is supplied by Strem Chemic...

You, Pei-Lin

2010-01-01

310

Archiving requirements for electronic pharmaceutical manufacturing documents and associated executable software.  

Science.gov (United States)

Many pharmaceutical manufacturers are currently evaluating the feasibility of electronic batch record (EBR) and electronic document management (EDM) systems. Considerable effort has been invested in the design of the batch record files and electronic signature devices and procedures. Much less consideration has been given to the potential need for pharmaceutical manufacturers to be able to re-create the operational software environment necessary to review archived documents at some future date. The paper discusses methods, policies, and equipment that can be used to fulfill this function. PMID:7850453

Quinn, T

311

Archiving requirements for electronic pharmaceutical manufacturing documents and associated executable software.  

UK PubMed Central (United Kingdom)

Many pharmaceutical manufacturers are currently evaluating the feasibility of electronic batch record (EBR) and electronic document management (EDM) systems. Considerable effort has been invested in the design of the batch record files and electronic signature devices and procedures. Much less consideration has been given to the potential need for pharmaceutical manufacturers to be able to re-create the operational software environment necessary to review archived documents at some future date. The paper discusses methods, policies, and equipment that can be used to fulfill this function.

Quinn T

1994-11-01

312

MiniBooNE oscillation searches  

Energy Technology Data Exchange (ETDEWEB)

The range of oscillation analyses being pursued by the MiniBooNE collaboration is described. Focus is given to the various searches for electron neutrino appearance, but the disappearance of muon neutrinos and the appearance search for electron anti-neutrinos are covered as well.

Brice, Stephen J.; /Fermilab

2008-01-01

313

Electronics Lab  

Science.gov (United States)

This Web site offers a one-stop shop for electronic projects with images, circuits with full descriptions, schematics and diagrams for printed circuit boards (PCBs), integrated circuits, and homemade electronic devices. This site supports an active electronics hobbyist community with free electronics articles, a blog, tutorials, question and answer area, design tips and hints, and an online electronics market with no registration required that allows people to buy and sell electronic parts and devices. This is a good site to search while the old soldering iron is heating up for electronics components, testing equipment, electronic kits, and detailed schematics and diagrams for almost any kind of electronic project including: amplifier, audio and noise, MIDI, counter, radio, simulators, sensors, measurement, temperature detectors, timing and timers, and video.

2009-08-05

314

"Harte" oder "weiche" Suche? Manuelle vs. elektronische Suchstrategien in der Medienforschung Hard or Soft Searching? Electronic Database Versus Hand Searching in Media Research ¿Búsqueda rigurosa o blanda? La búsqueda electrónica en base de datos versus la búsqueda manual en la investigación de los medios  

Directory of Open Access Journals (Sweden)

Full Text Available Für qualitative Medienforschung ist es wesentlich, die Bedeutung ihrer Forschungsfrage für Samplingstrategien und die folgende Datenerhebung zu beachten. Wir illustrieren dies an Erfahrungen, die wir im Zuge der Auswahl einer Methodik zum Sammeln von Artikeln zu physischer Aktivität aus der Tagespresse gewonnen haben. Wir reflektieren die Konsequenzen von spezifischen Suchstrategien für unser Sampling, also von manueller Suche einerseits und elektronischer Suche andererseits und betonen in diesem Zusammenhang die unterschiedlichen Konsequenzen, die hieraus für die Reliabilität der Ergebnisse erwachsen. Forschende sollten sich der Vor- und Nachteile, die mit solchen Entscheidungen einhergehen, bewusst sein bis hin zu der Frage, welche Informationen jeweils verfügbar sind mit folgenden Konsequenzen für die eigentliche Forschungsarbeit. Wir schließen, indem wir die Bedeutsamkeit dieser Überlegungen für die Reliabilität einer Inhaltsanalyse veranschaulichen. URN: urn:nbn:de:0114-fqs0703204It is important for qualitative media researchers to consider the impact of their research objectives on the sample frame imposed and subsequent data-collection methods. To illustrate this, we present some of the issues we encountered in determining a method of gathering physical activity articles in daily newspapers. We consider the implications of search choices for our sample, highlight the impact of using hardcopy hand-searches and electronic indexes and emphasise the importance of conducting a study to determine the reliability of hand-searching versus electronic index search methods. We suggest that researchers should be aware of the benefits and drawbacks of search methods including what kinds of information these methods yield and the possible effects on the research project. We conclude by highlighting the importance of these discussions to the reliability of content analysis. URN: urn:nbn:de:0114-fqs0703204Es importante que los investigadores cualitativos de medios consideren el impacto de sus objetivos de investigación sobre el marco muestral impuesto y sobre los métodos de recolección de datos. Para ilustrar esto, presentamos algunos de los temas con los que tropezamos para determinar el método de búsqueda de artículos sobre la actividad física en los diarios. Consideramos las implicaciones de las elecciones de búsqueda para nuestra muestra, destacando el impacto de la realización manual de búsquedas de copia impresa y el uso de índices electrónicos, y enfatizamos la importancia de estudiar la fiabilidad de los métodos de búsqueda de manual versus electrónica. Sugerimos que los investigadores deben ser conscientes de los beneficios y las desventajas de los métodos de búsqueda incluyendo qué clases de la información producen estos métodos y los efectos posibles sobre el proyecto de investigación. Concluimos sbrayando la importancia de estas discusiones sobre la fiabilidad en el análisis del contenido. URN: urn:nbn:de:0114-fqs0703204

Stephannie C. Roy; Guy Faulkner; Sara-Jane Finlay

2007-01-01

315

Internet Search Engines  

Directory of Open Access Journals (Sweden)

Full Text Available A general study about the internet search engines, the study deals main 7 points; the differance between search engines and search directories, components of search engines, the percentage of sites covered by search engines, cataloging of sites, the needed time for sites appearance in search engines, search capabilities, and types of search engines.

Fatmaa El Zahraa Mohamed Abdou

2004-01-01

316

Higgs Searches  

Energy Technology Data Exchange (ETDEWEB)

We present the status and prospects of Higgs searches at the Tevatron and the LHC. Results from the Tevatron are using up to 5 fb{sup -} of data collected with the CDF and D0 detectors. The major contributing processes include associated production (WH {yields} l{nu}bb, ZH {yields} {nu}{nu}bb, ZH {yields} llbb) and gluon fusion (gg {yields} H {yields} WW{sup (*)}). Improvements across the full mass range resulting from the larger data sets, improved analyses techniques and increased signal acceptance are discussed. Recent results exclude the SM Higgs boson in a mass range of 160 < m{sub H} < 170 GeV. Searches for the neutral MSSM Higgs boson in the region 90 < m{sub A} < 200 GeV exclude tan {beta} values down to 30 for several benchmark scenarios.

Peters, Krisztian

2009-11-01

317

An overview of Electronic Document Management System product offerings.  

Science.gov (United States)

The goal of this article is to provide insight in the evaluation of Electronic Document Management Systems (EDMSs) and the current EDMS vendors and their product offerings. Comparisons are made between the vendors and the products over the past decade. Appendix A and Appendix B outline many of today's key vendor offerings. Issues such as HIPAA and medical errors are discussed as it becomes clearer that the quality of patient care can be positively impacted with the application of information technology such as EDMSs. PMID:12402637

Doupnik, Anita M

2002-08-01

318

An overview of Electronic Document Management System product offerings.  

UK PubMed Central (United Kingdom)

The goal of this article is to provide insight in the evaluation of Electronic Document Management Systems (EDMSs) and the current EDMS vendors and their product offerings. Comparisons are made between the vendors and the products over the past decade. Appendix A and Appendix B outline many of today's key vendor offerings. Issues such as HIPAA and medical errors are discussed as it becomes clearer that the quality of patient care can be positively impacted with the application of information technology such as EDMSs.

Doupnik AM

2002-08-01

319

Single electron sensitive GridPix TPCs and their application in Dark Matter search and v-less Double Beta Decay Experiments  

International Nuclear Information System (INIS)

[en] The industrial production of monolithic GridPix pixel chips for the digital readout of primary electrons in a TPC is under study at IZM-Fraunhofer, Berlin. With future low-cost chips, new applications are foreseen in TPCs for bi-phase Ar/Xe dark matter experiments, and for v-less double beta decay experiments.

2011-08-10

320

Single electron sensitive GridPix TPCs and their application in Dark Matter search and v-less Double Beta Decay Experiments  

Energy Technology Data Exchange (ETDEWEB)

The industrial production of monolithic GridPix pixel chips for the digital readout of primary electrons in a TPC is under study at IZM-Fraunhofer, Berlin. With future low-cost chips, new applications are foreseen in TPCs for bi-phase Ar/Xe dark matter experiments, and for v-less double beta decay experiments.

Van der Graaf, Harry, E-mail: vdgraaf@nikhef.nl [NIKHEF, Amsterdam (Netherlands)

2011-08-10

 
 
 
 
321

Status of an experiment aimed at laboratory searches for the electron-antineutrino magnetic moment at a level of ?? ? 3 x 10-12?B  

International Nuclear Information System (INIS)

[en] An experiment aimed at directly detecting antineutrino-electron scattering by using a 40-MCi tritium ?-active source will make it possible to lower the present-day laboratory limit on the neutrino magnetic moment by two orders of magnitude. The experiment brings together novel unique technologies in studying rare processes of neutrino-electron scattering: (i) an artificial source of antineutrinos from tritium decay of 40-MCi activity with the antineutrino flux density of about 6 x 1014 cm-2 s-1 and (ii) new types of detectors capable of detecting electrons of energy down to about 10 eV, namely, a silicon cryogenic detector based on the ionization-into-heat conversion effect and a high-pure germanium detector with an internal signal amplification in the electric field. A compact installation located at a specially equipped underground laboratory (?100 mwe) will provide favorable background conditions for running the experiment. With a background level of about 0.1 event/(kg keV d) and detector assembly masses of 3 and 5 kg for the silicon and germanium ones, respectively, a limit of ?? ? 3 x 10-12?B on the electron-antineutrino magnetic moment will be obtained within 1 to 2 years of data acquisition. The status of the experiment and the state of the art are presented

2001-01-01

322

Education and training for records management in the electronic environment - the (re)search for an appropriate model. Professional development, Training, Education, Models, Records management  

Directory of Open Access Journals (Sweden)

Full Text Available Managing records in the e-environment constitutes a complex and challenging strategic issue for all organizations because IT systems shape business operations and the nature and management of the records they generate. IT personnel, administrators, archivists, records creators and users, as well as records managers, must work in partnership to ensure the authenticity, reliability, integrity, and ongoing usability of records. Education and training provision must evolve to fulfil the needs of all of these players in this complex environment. Everyone needs a macro-level understanding, combined with micro-level knowledge and practical skills, determined by their role, responsibility and level of systems interface. This matrix of horizontal and vertical mappings defines a pathway tailored to the individual's recordkeeping role. The requirement is holistic not atomistic, because it is integrated with the business processes. This study critically evaluates existing initiatives and initial results of a doctoral study searching for a best practice model.

McLeod J.; Hare C.; Johare R.

2004-01-01

323

Search for direct top squark pair production in final states with one electron or muon using 21 fb$^{-1}$ of ATLAS data  

CERN Document Server

The poster presents latest results of the search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in $\\sqrt s$=8 TeV pp collisions using L=21 fb$^{-1}$ of ATLAS data. Two top squark decay scenarios are considered: (a) to a top quark and a long-lived undetected neutral particle (LSP), (b) to a bottom quark and a chargino, where the chargino decays via an on- or off-shell W boson to the LSP. The analysis also employs a new dedicated shape-fit method to target the challenging parameter region where $m$(stop) is close to the kinematic boundary $m$(top) + $m$(LSP).

Rosbach, K; The ATLAS collaboration

2013-01-01

324

Search for direct top squark pair production in final states with one electron or muon using 21 fb$^{?1}$ of ATLAS data  

CERN Document Server

This article presents latest results of the search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in $\\sqrt s=8$ TeV pp collisions using L=21 fb$^{-1}$ of data recorded with the ATLAS detector at the LHC. Two top squark decay scenarios are considered: (a) to a top quark and a long-lived undetected neutral particle (LSP), (b) to a bottom quark and a chargino, where the chargino decays via an on- or off-shell W boson to the LSP. The analysis also employs a new dedicated shape-fit method to target the challenging parameter region where $m(\\tilde t)$ is close to the kinematic boundary $m(t)$ +$m(LSP)$.

Rosbach, K; The ATLAS collaboration

2013-01-01

325

Study of the motion of electrons in non polar classical liquids. Measurement of Hall effect and f.i.r. search for low energy traps: progress report  

International Nuclear Information System (INIS)

During the last year the first measurements were obtained of the Hall mobility of electrons injected in an insulating non polar liquid (tetramethyl silane). The resulting Hall mobility appears to be approx. 10% higher than the drift mobility measured on the same sample. We are completing a data acquisition system to be able to correct for several experimental errors that became apparent due, e.g., to the random fluctuations of accelerator current, the nonhomogeneity of the applied electric fields, etc. Theoretical work aimed at the understanding of the observed electric field induced increase of the electron capture rate constant by N2O dissolved in Ar and Xe was carried out. Similarly to the conclusions reached in the case of O2 and SF6 the Stark effect is responsible for the electric field induced changes of the capture probability. Finally a large portion of the equipment necessary for the f.i.r. photoconductivity experiment was constructed. During its testing it became obvious that changes of design were needed because the major source of noise is not expected to be detector noise but instead, shot noise associated with the main electron current

1981-01-01

326

Status of the Experiment on the Laboratory Search for the Electron Antineutrino Magnetic Moment at the Level mu_nu < 3 s 10^{-12}mu_B  

CERN Document Server

The experiment on the direct detection of antineutrino-electron scattering with an artificial tritium source allows to lower the present-day laboratory limit for the neutrino magnetic moment by two orders of magnitude. The experiment brings together novel unique technologies in studies of rare processes of neutrino-electron scattering: an artificial source of antineutrinos from tritium decay of 40 MCi activity with the antineutrino flux density ~6 10^{14}cm^{-2} s^{-1}; new types of detectors capable of detecting electrons with energy down to ~10 eV, namely, a silicon cryogenic detector based on the ionization-into-heat conversion effect, a high purity germanium detector with the internal amplification of a signal in the electric field. A compact installation located in a specially equipped laboratory underground <100 m w.e.) will provide favorable background conditions for running the experiment. With the background level about 0.1 events/kg keV day and detector assembly masses 3kg and 5kg for the silicon...

Neganov, B S; Yukhimchuk, A A; Bogdanova, L N; Beda, A G; Starostin, A S

2001-01-01

327

Ab initio random structure searching  

International Nuclear Information System (INIS)

It is essential to know the arrangement of the atoms in a material in order to compute and understand its properties. Searching for stable structures of materials using first-principles electronic structure methods, such as density-functional-theory (DFT), is a rapidly growing field. Here we describe our simple, elegant and powerful approach to searching for structures with DFT, which we call ab initio random structure searching (AIRSS). Applications to discovering the structures of solids, point defects, surfaces, and clusters are reviewed. New results for iron clusters on graphene, silicon clusters, polymeric nitrogen, hydrogen-rich lithium hydrides, and boron are presented. (topical review)

2011-02-09

328

Autonomous Search  

CERN Multimedia

Decades of innovations in combinatorial problem solving have produced better and more complex algorithms. These new methods are better since they can solve larger problems and address new application domains. They are also more complex which means that they are hard to reproduce and often harder to fine-tune to the peculiarities of a given problem. This last point has created a paradox where efficient tools are out of reach of practitioners. Autonomous search (AS) represents a new research field defined to precisely address the above challenge. Its major strength and originality consist in the

Hamadi, Youssef; Saubion, Frédéric

2012-01-01

329

Mutual Search  

CERN Multimedia

We introduce a search problem called ``mutual search'' where $k$ \\agents, arbitrarily distributed over $n$ sites, are required to locate one another by posing queries of the form ``Anybody at site $i$?''. We ask for the least number of queries that is necessary and sufficient. For the case of two \\agents using deterministic protocols we obtain the following worst-case results: In an oblivious setting (where all pre-planned queries are executed) there is no savings: $n-1$ queries are required and are sufficient. In a nonoblivious setting we can exploit the paradigm of ``no news is also news'' to obtain significant savings: in the synchronous case $0.586n$ queries suffice and $0.536n$ queries are required; in the asynchronous case $0.896n$ queries suffice and a fortiori 0.536 queries are required; for $o(\\sqrt{n})$ \\agents using a deterministic protocol less than $n$ queries suffice; there is a simple randomized protocol for two \\agents with worst-case expected $0.5n$ queries and all randomized protocols requir...

Buhrman, H; Garay, J A; Hoepman, J H; Tromp, J H; Vitanyi, P; Buhrman, Harry; Franklin, Matthew; Garay, Juan A; Hoepman, Jaap-Henk; Tromp, John; Vitanyi, Paul

1999-01-01

330

Baseline experiment of interferometric PGS at the EDM network in the south Kanto area, Japan. GPS kansho sokuiho ni yoru kisen sokuryo no kiso jikken (Minamikanto koha sokuryomo ni okeru hikaku kansoku)  

Energy Technology Data Exchange (ETDEWEB)

The first field baseline observation using SONY GTT-4000, a GPS (Global Positioning System) interferometer was conducted at the EDM (Electromagnetic Distance Measurements) network of the Earthquake Research Institute in the southern Kanto Area, Japan. For the experiments, three GTT-4000 receivers of single frequency version were deployed at three sites which compose a triangle with side distances of about 8km, 12km, and 14km. The present paper introduces the receiver briefly, and the distances obtained by this receiver are compared with those obtained by the EDM observations. Consequently, it was shown that the results by GTT-4000 coincided well with those by EDM with less than 2ppm of accuracy. It was also shown that misclosures of the triangle which was obtained by the relative coordinate estimates were smaller than 1ppm. Furthermore, it was revealed that due to introduction of upgraded dual frequency capability, the receiver can reduce the effect of the ionospheric path delays. 5 refs., 4 figs., 2 tabs.

Kato, T.; Murata, I.; Matsumoto, S.; Hirata, Y.; Takahashi, T. (The University of Tokyo, Tokyo (Japan). Earthquake Research Institute); Tsuchiya, A. (National Space Development Agency of Japan, Tokyo (Japan)); Watada, S. (California Institute of Technology, California (USA)); Iga, A. (Sony Corp., Tokyo (Japan))

1991-11-25

331

PERFORMANCE STUDY OF TOOL MATERIALS AND OPTIMIZATION OF PROCESS PARAMETERS DURING EDM ON ZrB2-SiC COMPOSITE THROUGH PARTICLE SWARM OPTIMIZATION ALGORITHM  

Directory of Open Access Journals (Sweden)

Full Text Available This paper deals with optimization of EDM of ZrB2-SiC composite using Particle swarm optimization (PSO). In this work ZrB2 with different volume proportions of SiC (15, 20, 25 and 30%) are selected as workpiece. ZrB2– SiC ultra high temperature ceramics exhibited an excellent thermal-oxidative and configurationally stable under supersonic conditions, which suggests they are potential candidates for leading edges. Results indicate that ZrB2–SiC can maintain the high oxidation resistance coupled with configurationally stable at temperatures lower than that point which results in significant softening and degradation of the oxide scale, and that point will bethe temperature limit for UHTC.It is a candidate for high temperature aerospace applications such as hypersonic flight or rocket propulsion systems. To expand its area of applications, machining is mandatory. Due to high strength and hardness of ZrB2 mechanical machining is very difficult or even impossible. Electrical discharge machining is promising technology to machine ceramic components of complex shape with high-dimensional accuracy and good surface roughness. In this investigation the influence of SiC over the machinability is carriedout. Input parameters are pulse on time, pulse off time and tool materials (graphite, titanium niobium, tantalum and tungsten). Pulse on time and pulse off time are kept at three different levels. Objective is to maximize the material removal rate (MRR) and to minimize the roundness, surface roughness (SR), tool wear rate (TWR),Overcut and taper angle during EDM of hot pressed ZrB2-SiC composite. In general Desirability Functional Analysis (DFA) is used to combine multiple quality characteristics into a single performance statistics. While combining the quality characteristics, weight should be assigned to each response. For this problem, unequalweights are assigned using particle swarm optimization (PSO). Interaction of pulse on time with tool material is investigated using analysis of variance (ANOVA) and it shows that tool material is most significant factor.

S.SIVASANKAR; R.JEYAPAUL

2013-01-01

332

Search for WW and WZ resonances decaying to electron, missing E(T), and two jets in pp collisions at square root(s) = 1.96??TeV.  

Science.gov (United States)

Using data from 2.9??fb(-1) of integrated luminosity collected with the CDF II detector at the Tevatron, we search for resonances decaying into a pair of on-shell gauge bosons, WW or WZ, where one W decays into an electron and a neutrino, and the other boson decays into two jets. We observed no statistically significant excess above the expected standard model background, and we set cross section limits at 95% confidence level on G* (Randall-Sundrum graviton), Z', and W' bosons. By comparing these limits to theoretical cross sections, mass exclusion regions for the three particles are derived. The mass exclusion regions for Z' and W' are further evaluated as a function of their gauge coupling strength. PMID:20867293

Aaltonen, T; Adelman, J; Alvarez González, B; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Appel, J; Apresyan, A; Arisawa, T; Artikov, A; Asaadi, J; Ashmanskas, W; Attal, A; Aurisano, A; Azfar, F; Badgett, W; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Barria, P; Bartos, P; Bauer, G; Beauchemin, P-H; Bedeschi, F; Beecher, D; Behari, S; Bellettini, G; Bellinger, J; Benjamin, D; Beretvas, A; Bhatti, A; Binkley, M; Bisello, D; Bizjak, I; Blair, R E; Blocker, C; Blumenfeld, B; Bocci, A; Bodek, A; Boisvert, V; Bortoletto, D; Boudreau, J; Boveia, A; Brau, B; Bridgeman, A; Brigliadori, L; Bromberg, C; Brubaker, E; Budagov, J; Budd, H S; Budd, S; Burkett, K; Busetto, G; Bussey, P; Buzatu, A; Byrum, K L; Cabrera, S; Calancha, C; Camarda, S; Campanelli, M; Campbell, M; Canelli, F; Canepa, A; Carls, B; Carlsmith, D; Carosi, R; Carrillo, S; Carron, S; Casal, B; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavaliere, V; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chang, S H; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, K; Chokheli, D; Chou, J P; Chung, K; Chung, W H; Chung, Y S; Chwalek, T; Ciobanu, C I; Ciocci, M A; Clark, A; Clark, D; Compostella, G; Convery, M E; Conway, J; Corbo, M; Cordelli, M; Cox, C A; Cox, D J; Crescioli, F; Cuenca Almenar, C; Cuevas, J; Culbertson, R; Cully, J C; Dagenhart, D; d'Ascenzo, N; Datta, M; Davies, T; de Barbaro, P; De Cecco, S; Deisher, A; De Lorenzo, G; Dell'Orso, M; Deluca, C; Demortier, L; Deng, J; Deninno, M; d'Errico, M; Di Canto, A; Di Ruzza, B; Dittmann, J R; D'Onofrio, M; Donati, S; Dong, P; Dorigo, T; Dube, S; Ebina, K; Elagin, A; Erbacher, R; Errede, D; Errede, S; Ershaidat, N; Eusebi, R; Fang, H C; Farrington, S; Fedorko, W T; Feild, R G; Feindt, M; Fernandez, J P; Ferrazza, C; Field, R; Flanagan, G; Forrest, R; Frank, M J; Franklin, M; Freeman, J C; Furic, I; Gallinaro, M; Galyardt, J; Garberson, F; Garcia, J E; Garfinkel, A F; Garosi, P; Gerberich, H; Gerdes, D; Gessler, A; Giagu, S; Giakoumopoulou, V; Giannetti, P; Gibson, K; Gimmell, J L; Ginsburg, C M; Giokaris, N; Giordani, M; Giromini, P; Giunta, M; Giurgiu, G; Glagolev, V; Glenzinski, D; Gold, M; Goldschmidt, N; Golossanov, A; Gomez, G; Gomez-Ceballos, G; Goncharov, M; González, O; Gorelov, I; Goshaw, A T; Goulianos, K; Gresele, A; Grinstein, S; Grosso-Pilcher, C; Group, R C; Grundler, U; Guimaraes da Costa, J; Gunay-Unalan, Z; Haber, C; Hahn, S R; Halkiadakis, E; Han, B-Y; Han, J Y; Happacher, F; Hara, K; Hare, D; Hare, M; Harr, R F; Hartz, M; Hatakeyama, K; Hays, C; Heck, M; Heinrich, J; Herndon, M; Heuser, J; Hewamanage, S; Hidas, D; Hill, C S; Hirschbuehl, D; Hocker, A; Hou, S; Houlden, M; Hsu, S-C; Hughes, R E; Hurwitz, M; Husemann, U; Hussein, M; Huston, J; Incandela, J; Introzzi, G; Iori, M; Ivanov, A; James, E; Jang, D; Jayatilaka, B; Jeon, E J; Jha, M K; Jindariani, S; Johnson, W; Jones, M; Joo, K K; Jun, S Y; Jung, J E; Junk, T R; Kamon, T; Kar, D; Karchin, P E; Kato, Y; Kephart, R; Ketchum, W; Keung, J; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, H W; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kimura, N; Kirsch, L; Klimenko, S; Ko, B R; Kondo, K; Kong, D J; Konigsberg, J; Korytov, A; Kotwal, A V; Kreps, M; Kroll, J; Krop, D; Krumnack, N; Kruse, M; Krutelyov, V; Kuhr, T; Kulkarni, N P; Kurata, M; Kwang, S; Laasanen, A T; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; Lazzizzera, I; LeCompte, T; Lee, E; Lee, H S; Lee, J S; Lee, S W; Leone, S; Lewis, J D; Lin, C-J; Linacre, J; Lindgren, M; Lipeles, E; Lister, A; Litvintsev, D O; Liu, C; Liu, T; Lockyer, N S; Loginov, A; Lovas, L; Lucchesi, D; Lueck, J; Lujan, P; Lukens, P; Lungu, G; Lys, J; Lysak, R; MacQueen, D; Madrak, R; Maeshima, K; Makhoul, K; Maksimovic, P; Malde, S; Malik, S; Manca, G; Manousakis-Katsikakis, A; Margaroli, F; Marino, C; Marino, C P; Martin, A; Martin, V; Martínez, M; Martínez-Ballarín, R; Mastrandrea, P; Mathis, M; Mattson, M E; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Mehtala, P; Menzione, A; Mesropian, C; Miao, T; Mietlicki, D; Miladinovic, N; Miller, R; Mills, C; Milnik, M; Mitra, A; Mitselmakher, G; Miyake, H; Moed, S; Moggi, N; Mondragon, M N; Moon, C S; Moore, R; Morello, M J; Morlock, J; Movilla Fernandez, P; Mülmenstädt, J; Mukherjee, A; Muller, Th; Murat, P; Mussini, M; Nachtman, J; Nagai, Y; Naganoma, J; Nakamura, K; Nakano, I; Napier, A; Nett, J; Neu, C; Neubauer, M S; Neubauer, S; Nielsen, J; Nodulman, L; Norman, M; Norniella, O; Nurse, E; Oakes, L; Oh, S H; Oh, Y D; Oksuzian, I; Okusawa, T; Orava, R; Osterberg, K; Pagan Griso, S; Pagliarone, C; Palencia, E; Papadimitriou, V; Papaikonomou, A; Paramanov, A A; Parks, B; Pashapour, S; Patrick, J; Pauletta, G; Paulini, M; Paus, C; Peiffer, T; Pellett, D E; Penzo, A; Phillips, T J; Piacentino, G; Pianori, E; Pinera, L; Pitts, K; Plager, C

2010-06-17

333

Search for WW and WZ resonances decaying to electron, missing E(T), and two jets in pp collisions at square root(s) = 1.96??TeV.  

UK PubMed Central (United Kingdom)

Using data from 2.9??fb(-1) of integrated luminosity collected with the CDF II detector at the Tevatron, we search for resonances decaying into a pair of on-shell gauge bosons, WW or WZ, where one W decays into an electron and a neutrino, and the other boson decays into two jets. We observed no statistically significant excess above the expected standard model background, and we set cross section limits at 95% confidence level on G* (Randall-Sundrum graviton), Z', and W' bosons. By comparing these limits to theoretical cross sections, mass exclusion regions for the three particles are derived. The mass exclusion regions for Z' and W' are further evaluated as a function of their gauge coupling strength.

Aaltonen T; Adelman J; Alvarez González B; Amerio S; Amidei D; Anastassov A; Annovi A; Antos J; Apollinari G; Appel J; Apresyan A; Arisawa T; Artikov A; Asaadi J; Ashmanskas W; Attal A; Aurisano A; Azfar F; Badgett W; Barbaro-Galtieri A; Barnes VE; Barnett BA; Barria P; Bartos P; Bauer G; Beauchemin PH; Bedeschi F; Beecher D; Behari S; Bellettini G; Bellinger J; Benjamin D; Beretvas A; Bhatti A; Binkley M; Bisello D; Bizjak I; Blair RE; Blocker C; Blumenfeld B; Bocci A; Bodek A; Boisvert V; Bortoletto D; Boudreau J; Boveia A; Brau B; Bridgeman A; Brigliadori L; Bromberg C; Brubaker E; Budagov J; Budd HS; Budd S; Burkett K; Busetto G; Bussey P; Buzatu A; Byrum KL; Cabrera S; Calancha C; Camarda S; Campanelli M; Campbell M; Canelli F; Canepa A; Carls B; Carlsmith D; Carosi R; Carrillo S; Carron S; Casal B; Casarsa M; Castro A; Catastini P; Cauz D; Cavaliere V; Cavalli-Sforza M; Cerri A; Cerrito L; Chang SH; Chen YC; Chertok M; Chiarelli G; Chlachidze G; Chlebana F; Cho K; Chokheli D; Chou JP; Chung K; Chung WH; Chung YS; Chwalek T; Ciobanu CI; Ciocci MA; Clark A; Clark D; Compostella G; Convery ME; Conway J; Corbo M; Cordelli M; Cox CA; Cox DJ; Crescioli F; Cuenca Almenar C; Cuevas J; Culbertson R; Cully JC; Dagenhart D; d'Ascenzo N; Datta M; Davies T; de Barbaro P; De Cecco S; Deisher A; De Lorenzo G; Dell'Orso M; Deluca C; Demortier L; Deng J; Deninno M; d'Errico M; Di Canto A; Di Ruzza B; Dittmann JR; D'Onofrio M; Donati S; Dong P; Dorigo T; Dube S; Ebina K; Elagin A; Erbacher R; Errede D; Errede S; Ershaidat N; Eusebi R; Fang HC; Farrington S; Fedorko WT; Feild RG; Feindt M; Fernandez JP; Ferrazza C; Field R; Flanagan G; Forrest R; Frank MJ; Franklin M; Freeman JC; Furic I; Gallinaro M; Galyardt J; Garberson F; Garcia JE; Garfinkel AF; Garosi P; Gerberich H; Gerdes D; Gessler A; Giagu S; Giakoumopoulou V; Giannetti P; Gibson K; Gimmell JL; Ginsburg CM; Giokaris N; Giordani M; Giromini P; Giunta M; Giurgiu G; Glagolev V; Glenzinski D; Gold M; Goldschmidt N; Golossanov A; Gomez G; Gomez-Ceballos G; Goncharov M; González O; Gorelov I; Goshaw AT; Goulianos K; Gresele A; Grinstein S; Grosso-Pilcher C; Group RC; Grundler U; Guimaraes da Costa J; Gunay-Unalan Z; Haber C; Hahn SR; Halkiadakis E; Han BY; Han JY; Happacher F; Hara K; Hare D; Hare M; Harr RF; Hartz M; Hatakeyama K; Hays C; Heck M; Heinrich J; Herndon M; Heuser J; Hewamanage S; Hidas D; Hill CS; Hirschbuehl D; Hocker A; Hou S; Houlden M; Hsu SC; Hughes RE; Hurwitz M; Husemann U; Hussein M; Huston J; Incandela J; Introzzi G; Iori M; Ivanov A; James E; Jang D; Jayatilaka B; Jeon EJ; Jha MK; Jindariani S; Johnson W; Jones M; Joo KK; Jun SY; Jung JE; Junk TR; Kamon T; Kar D; Karchin PE; Kato Y; Kephart R; Ketchum W; Keung J; Khotilovich V; Kilminster B; Kim DH; Kim HS; Kim HW; Kim JE; Kim MJ; Kim SB; Kim SH; Kim YK; Kimura N; Kirsch L; Klimenko S; Ko BR; Kondo K; Kong DJ; Konigsberg J; Korytov A; Kotwal AV; Kreps M; Kroll J; Krop D; Krumnack N; Kruse M; Krutelyov V; Kuhr T; Kulkarni NP; Kurata M; Kwang S; Laasanen AT; Lami S; Lammel S; Lancaster M; Lander RL; Lannon K; Lath A; Latino G; Lazzizzera I; LeCompte T; Lee E; Lee HS; Lee JS; Lee SW; Leone S; Lewis JD; Lin CJ; Linacre J; Lindgren M; Lipeles E; Lister A; Litvintsev DO; Liu C; Liu T; Lockyer NS; Loginov A; Lovas L; Lucchesi D; Lueck J; Lujan P; Lukens P; Lungu G; Lys J; Lysak R; MacQueen D; Madrak R; Maeshima K; Makhoul K; Maksimovic P; Malde S; Malik S; Manca G; Manousakis-Katsikakis A; Margaroli F; Marino C; Marino CP; Martin A; Martin V; Martínez M; Martínez-Ballarín R; Mastrandrea P; Mathis M; Mattson ME; Mazzanti P; McFarland KS; McIntyre P; McNulty R; Mehta A; Mehtala P; Menzione A; Mesropian C; Miao T; Mietlicki D; Miladinovic N; Miller R; Mills C; Milnik M; Mitra A; Mitselmakher G; Miyake H; Moed S; Moggi N; Mondragon MN; Moon CS; Moore R; Morello MJ; Morlock J; Movilla Fernandez P; Mülmenstädt J; Mukherjee A; Muller T; Murat P; Mussini M; Nachtman J; Nagai Y; Naganoma J; Nakamura K; Nakano I; Napier A; Nett J; Neu C; Neubauer MS; Neubauer S; Nielsen J; Nodulman L; Norman M; Norniella O; Nurse E; Oakes L; Oh SH; Oh YD; Oksuzian I; Okusawa T; Orava R; Osterberg K; Pagan Griso S; Pagliarone C; Palencia E; Papadimitriou V; Papaikonomou A; Paramanov AA; Parks B; Pashapour S; Patrick J; Pauletta G; Paulini M; Paus C; Peiffer T; Pellett DE; Penzo A; Phillips TJ; Piacentino G; Pianori E; Pinera L; Pitts K; Plager C; Pondrom L; Potamianos K; Poukhov O; Prokoshin F; Pronko A; Ptohos F; Pueschel E; Punzi G; Pursley J; Rademacker J; Rahaman A; Ramakrishnan V; Ranjan N; Redondo I; Renton P; Renz M; Rescigno M; Richter S; Rimondi F; Ristori L; Robson A; Rodrigo T; Rodriguez T; Rogers E; Rolli S; Roser R; Rossi M; Rossin R; Roy P; Ruiz A; Russ J; Rusu V; Rutherford B; Saarikko H; Safonov A; Sakumoto WK; Santi L; Sartori L; Sato K; Saveliev V; Savoy-Navarro A; Schlabach P; Schmidt A; Schmidt EE; Schmidt MA; Schmidt MP; Schmitt M; Schwarz T; Scodellaro L; Scribano A; Scuri F; Sedov A; Seidel S

2010-06-01

334

New dispenser types for integrated pest management of agriculturally significant insect pests: an algorithm with specialized searching capacity in electronic data bases.  

Science.gov (United States)

Pheromone effects discovered some 130 years, but scientifically defined just half a century ago, are a great bonus for basic and applied biology. Specifically, pest management efforts have been advanced in many insect orders, either for purposes or monitoring, mass trapping, or for mating disruption. Finding and applying a new search algorithm, nearly 20,000 entries in the pheromone literature have been counted, a number much higher than originally anticipated. This compilation contains identified and thus synthesizable structures for all major orders of insects. Among them are hundreds of agriculturally significant insect pests whose aggregated damages and costly control measures range in the multibillions of dollars annually. Unfortunately, and despite a lot of effort within the international entomological scene, the number of efficient and cheap engineering solutions for dispensing pheromones under variable field conditions is uncomfortably lagging behind. Some innovative approaches are cited from the relevant literature in an attempt to rectify this situation. Recently, specifically designed electrospun organic nanofibers offer a lot of promise. With their use, the mating communication of vineyard insects like Lobesia botrana (Lep.: Tortricidae) can be disrupted for periods of seven weeks. PMID:23885431

Hummel, H E; Eisinger, M T; Hein, D F; Breuer, M; Schmid, S; Leithold, G

2012-01-01

335

New dispenser types for integrated pest management of agriculturally significant insect pests: an algorithm with specialized searching capacity in electronic data bases.  

UK PubMed Central (United Kingdom)

Pheromone effects discovered some 130 years, but scientifically defined just half a century ago, are a great bonus for basic and applied biology. Specifically, pest management efforts have been advanced in many insect orders, either for purposes or monitoring, mass trapping, or for mating disruption. Finding and applying a new search algorithm, nearly 20,000 entries in the pheromone literature have been counted, a number much higher than originally anticipated. This compilation contains identified and thus synthesizable structures for all major orders of insects. Among them are hundreds of agriculturally significant insect pests whose aggregated damages and costly control measures range in the multibillions of dollars annually. Unfortunately, and despite a lot of effort within the international entomological scene, the number of efficient and cheap engineering solutions for dispensing pheromones under variable field conditions is uncomfortably lagging behind. Some innovative approaches are cited from the relevant literature in an attempt to rectify this situation. Recently, specifically designed electrospun organic nanofibers offer a lot of promise. With their use, the mating communication of vineyard insects like Lobesia botrana (Lep.: Tortricidae) can be disrupted for periods of seven weeks.

Hummel HE; Eisinger MT; Hein DF; Breuer M; Schmid S; Leithold G

2012-01-01

336

Search for Higgs boson production in trilepton and like-charge electron-muon final states with the D0 detector  

Science.gov (United States)

We present a search for Higgs bosons in multilepton final states in pp¯ collisions at s=1.96TeV recorded with the D0 detector at the Fermilab Tevatron Collider, using the full Run II data set with integrated luminosities of up to 9.7fb-1. The multilepton states considered are ee?, e??, ??h?h, and like-charge e±?± pairs. These channels directly probe the HVV (V=W, Z) coupling of the Higgs boson in production and decay. The ??h?h channel is also sensitive to H??+?- decays. Upper limits at the 95% C.L on the rate of standard model Higgs boson production are derived in the mass range 100?MH?200GeV. The expected and observed limits are a factor of 6.3 and 8.4 above the predicted standard model cross section at MH=125GeV. We also interpret the data in a fermiophobic Higgs boson model.

Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Askew, A.; Atkins, S.; Augsten, K.; Avila, C.; Badaud, F.; Bagby, L.; Baldin, B.; Bandurin, D. V.; Banerjee, S.; Barberis, E.; Baringer, P.; Bartlett, J. F.; Bassler, U.; Bazterra, V.; Bean, A.; Begalli, M.; Bellantoni, L.; Beri, S. B.; Bernardi, G.; Bernhard, R.; Bertram, I.; Besançon, M.; Beuselinck, R.; Bhat, P. C.; Bhatia, S.; Bhatnagar, V.; Blazey, G.; Blessing, S.; Bloom, K.; Boehnlein, A.; Boline, D.; Boos, E. E.; Borissov, G.; Brandt, A.; Brandt, O.; Brock, R.; Bross, A.; Brown, D.; Bu, X. B.; Buehler, M.; Buescher, V.; Bunichev, V.; Burdin, S.; Buszello, C. P.; Camacho-Pérez, E.; Casey, B. C. K.; Castilla-Valdez, H.; Caughron, S.; Chakrabarti, S.; Chakraborty, D.; Chan, K. M.; Chandra, A.; Chapon, E.; Chen, G.; Cho, S. W.; Choi, S.; Choudhary, B.; Cihangir, S.; Claes, D.; Clutter, J.; Cooke, M.; Cooper, W. E.; Corcoran, M.; Couderc, F.; Cousinou, M.-C.; Cutts, D.; Das, A.; Davies, G.; de Jong, S. J.; De La Cruz-Burelo, E.; Déliot, F.; Demina, R.; Denisov, D.; Denisov, S. P.; Desai, S.; Deterre, C.; DeVaughan, K.; Diehl, H. T.; Diesburg, M.; Ding, P. F.; Dominguez, A.; Dubey, A.; Dudko, L. V.; Duperrin, A.; Dutt, S.; Dyshkant, A.; Eads, M.; Edmunds, D.; Ellison, J.; Elvira, V. D.; Enari, Y.; Evans, H.; Evdokimov, V. N.; Feng, L.; Ferbel, T.; Fiedler, F.; Filthaut, F.; Fisher, W.; Fisk, H. E.; Fortner, M.; Fox, H.; Fuess, S.; Garcia-Bellido, A.; García-González, J. A.; García-Guerra, G. A.; Gavrilov, V.; Geng, W.; Gerber, C. E.; Gershtein, Y.; Ginther, G.; Golovanov, G.; Grannis, P. D.; Greder, S.; Greenlee, H.; Grenier, G.; Gris, Ph.; Grivaz, J.-F.; Grohsjean, A.; Grünendahl, S.; Grünewald, M. W.; Guillemin, T.; Gutierrez, G.; Gutierrez, P.; Haley, J.; Han, L.; Harder, K.; Harel, A.; Hauptman, J. M.; Hays, J.; Head, T.; Hebbeker, T.; Hedin, D.; Hegab, H.; Heinson, A. P.; Heintz, U.; Hensel, C.; Heredia-De La Cruz, I.; Herner, K.; Hesketh, G.; Hildreth, M. D.; Hirosky, R.; Hoang, T.; Hobbs, J. D.; Hoeneisen, B.; Hogan, J.; Hohlfeld, M.; Howley, I.; Hubacek, Z.; Hynek, V.; Iashvili, I.; Ilchenko, Y.; Illingworth, R.; Ito, A. S.; Jabeen, S.; Jaffré, M.; Jayasinghe, A.; Jeong, M. S.; Jesik, R.; Jiang, P.; Johns, K.; Johnson, E.; Johnson, M.; Jonckheere, A.; Jonsson, P.; Joshi, J.; Jung, A. W.; Juste, A.; Kajfasz, E.; Karmanov, D.; Katsanos, I.; Kehoe, R.; Kermiche, S.; Khalatyan, N.; Khanov, A.; Kharchilava, A.; Kharzheev, Y. N.; Kiselevich, I.; Kohli, J. M.; Kozelov, A. V.; Kraus, J.; Kumar, A.; Kupco, A.; Kur?a, T.; Kuzmin, V. A.; Lammers, S.; Lebrun, P.; Lee, H. S.; Lee, S. W.; Lee, W. M.; Lei, X.; Lellouch, J.; Li, D.; Li, H.; Li, L.; Li, Q. Z.; Lim, J. K.; Lincoln, D.; Linnemann, J.; Lipaev, V. V.; Lipton, R.; Liu, H.; Liu, Y.; Lobodenko, A.; Lokajicek, M.; Lopes de Sa, R.; Luna-Garcia, R.; Lyon, A. L.; Maciel, A. K. A.; Magaña-Villalba, R.; Malik, S.; Malyshev, V. L.; Mansour, J.; Martínez-Ortega, J.; McCarthy, R.; McGivern, C. L.; Meijer, M. M.; Melnitchouk, A.; Menezes, D.; Mercadante, P. G.; Merkin, M.; Meyer, A.; Meyer, J.; Miconi, F.; Mondal, N. K.; Mulhearn, M.; Nagy, E.; Naimuddin, M.; Narain, M.; Nayyar, R.; Neal, H. A.; Negret, J. P.; Neustroev, P.; Nguyen, H. T.; Nunnemann, T.; Orduna, J.; Osman, N.; Osta, J.; Padilla, M.; Pal, A.; Parashar, N.; Parihar, V.; Park, S. K.; Partridge, R.; Parua, N.; Patwa, A.; Penning, B.; Perfilov, M.; Peters, Y.; Petridis, K.; Petrillo, G.; Pétroff, P.; Pleier, M.-A.; Podesta-Lerma, P. L. M.; Podstavkov, V. M.; Popov, A. V.; Prewitt, M.; Price, D.; Prokopenko, N.; Qian, J.; Quadt, A.; Quinn, B.; Rangel, M. S.; Ratoff, P. N.; Razumov, I.; Ripp-Baudot, I.; Rizatdinova, F.; Rominsky, M.; Ross, A.; Royon, C.; Rubinov, P.; Ruchti, R.; Sajot, G.; Salcido, P.; Sánchez-Hernández, A.; Sanders, M. P.; Santos, A. S.; Savage, G.; Sawyer, L.; Scanlon, T.; Schamberger, R. D.; Scheglov, Y.; Schellman, H.; Schwanenberger, C.; Schwienhorst, R.; Sekaric, J.; Severini, H.; Shabalina, E.; Shary, V.; Shaw, S.; Shchukin, A. A.; Shivpuri, R. K.; Simak, V.; Skubic, P.; Slattery, P.; Smirnov, D.; Smith, K. J.; Snow, G. R.; Snow, J.; Snyder, S.; Söldner-Rembold, S.; Sonnenschein, L.; Soustruznik, K.; Stark, J.; Stoyanova, D. A.; Strauss, M.; Suter, L.; Svoisky, P.; Titov, M.; Tokmenin, V. V.; Tsai, Y.-T.; Tsybychev, D.; Tuchming, B.; Tully, C.; Uvarov, L.; Uvarov, S.; Uzunyan, S.; Van Kooten, R.; van Leeuwen, W. M.; Varelas, N.; Varnes, E. W.; Vasilyev, I. A.; Verkheev, A. Y.; Vertogradov, L. S.; Verzocchi, M.; Vesterinen, M.; Vilanova, D.; Vokac, P.; Wahl, H. D.; Wang, M. H. L. S.; Warchol, J.; Watts, G.; Wayne, M.; Weichert, J.; Welty-Rieger, L.; White, A.; Wicke, D.; Williams, M. R. J.; Wilson, G. W.; Wobisch, M.; Wood, D. R.; Wyatt, T. R.; Xie, Y.

2013-09-01

337

Axion Searches  

CERN Document Server

The strong CP problem and its resolution through the existence of an axionare briefly reviewed. The constraints on the axion from accelerator searches,from the evolution of red giants and from supernova SN1987a combine to require$m_a < 3 \\cdot 10^{-3}$ eV, where $m_a$ is the axion mass. On the other hand,the constraint that axions do not overclose the universe implies $m_a \\gtwid10^{-6}$ eV. If $m_a \\sim 10^{-5}$ eV, axions contribute significantly to thecosmological energy density in the form of cold dark matter. Dark matter axionscan be detected by resonant conversion to microwave photons in a cavitypermeated by a static magnetic field and tuned to the axion mass. Experimentsusing this effect are described, as well as several other types of axionsearches.

Sikivie, P

2000-01-01

338

Search for the standard model Higgs boson in the two-electron and two-muon final state with the CMS detector  

International Nuclear Information System (INIS)

The decay of the standard model Higgs boson to ZZ(*), with both Zs decaying to leptons is one of the most important potential discovery channels for the Higgs boson at the large hadron collider at CERN. The four lepton state with the highest branching ratio is the two-electron two-muon final state. This paper presents the discovery potential of the Higgs boson in this channel with the CMS detector. Higgs boson masses between 115 and 600 GeV are explored. With the exception of a narrow region close to mH = 170 GeV, it is found that for 130 GeV?mH? 500 GeV, the Higgs boson is expected to be observable at CMS with significance exceeding 5? with 30 fb-1 of integrated luminosity. (research note from collaboration)

2007-01-01

339

Search for the standard model Higgs boson in the two-electron and two-muon final state with the CMS detector  

Energy Technology Data Exchange (ETDEWEB)

The decay of the standard model Higgs boson to ZZ{sup (*)}, with both Zs decaying to leptons is one of the most important potential discovery channels for the Higgs boson at the large hadron collider at CERN. The four lepton state with the highest branching ratio is the two-electron two-muon final state. This paper presents the discovery potential of the Higgs boson in this channel with the CMS detector. Higgs boson masses between 115 and 600 GeV are explored. With the exception of a narrow region close to m{sub H} = 170 GeV, it is found that for 130 GeV{<=}m{sub H}{<=} 500 GeV, the Higgs boson is expected to be observable at CMS with significance exceeding 5{sigma} with 30 fb{sup -1} of integrated luminosity. (research note from collaboration)

Futyan, D [Imperial College, London (United Kingdom); Fortin, D [University of California, Riverside, CA (United States); Giordano, D [Universita di Bari and INFN (Italy)

2007-09-15

340

Search for narrow sum-energy lines in electron-positron pair emission from heavy-ion collisions near the Coulomb barrier  

Energy Technology Data Exchange (ETDEWEB)

The first results are presented from a new experiment, APEX, designed to study the previously reported sharp lines in sum-energy spectra of positrons and electrons produced in collisions of very heavy ions. Data were collected for {sup 238}U+{sup 181}Ta at 5.95, 6.10, and 6.30 MeV/u and {sup 238}U+{sup 232}Th at 5.95 MeV/u. In none of our analyses is any evidence found for sharp sum-energy lines. For the specific case of the isolated decay of a neutral particle of mass 1.4--2.1 MeV/{ital c}{sup 2}, the upper limits on cross sections obtained from the present data are significantly less than the previously reported cross sections.

Ahmad, I.; Austin, S.M.; Back, B.B.; Betts, R.R.; Calaprice, F.P.; Chan, K.C.; Chishti, A.; Chowdhury, P.; Conner, C.; Dunford, R.W.; Fox, J.D.; Freedman, S.J.; Freer, M.; Gazes, S.B.; Hallin, A.L.; Happ, T.; Henderson, D.; Kaloskamis, N.I.; Kashy, E.; Kutschera, W.; Last, J.; Lister, C.J.; Liu, M.; Maier, M.R.; Mercer, D.J.; Mikolas, D.; Perera, P.A.A.; Rhein, M.D.; Roa, D.E.; Schiffer, J.P.; Trainor, T.A.; Wilt, P.; Winfield, J.S.; Wolanski, M.; Wolfs, F.L.H.; Wuosmaa, A.H.; Xu, G.; Young, A.; Yurkon, J.E. [Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)]|[National Superconducting Cyclotron Laboratory and Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States)]|[Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607 (United States)]|[Physics Department, Princeton University, Princeton, New Jersey 08544 (United States)]|[Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520 (United States)]|[Physics Department, Florida State University, Tallahassee, Florida 32306 (United States)]|[Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)]|[Department of Physics, University of Chicago, Chicago, Illinois 60637 (United States)]|[Nuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627 (United States)]|[Physics Department, Queen`s University, Kingston, Ontario, K7L 3N6 (Canada)]|[Gesellsch; (APEX Collaboration)

1995-10-02

 
 
 
 
341

Search for narrow sum-energy lines in electron-positron pair emission from heavy-ion collisions near the Coulomb barrier  

International Nuclear Information System (INIS)

[en] The first results are presented from a new experiment, APEX, designed to study the previously reported sharp lines in sum-energy spectra of positrons and electrons produced in collisions of very heavy ions. Data were collected for 238U+181Ta at 5.95, 6.10, and 6.30 MeV/u and 238U+232Th at 5.95 MeV/u. In none of our analyses is any evidence found for sharp sum-energy lines. For the specific case of the isolated decay of a neutral particle of mass 1.4--2.1 MeV/c2, the upper limits on cross sections obtained from the present data are significantly less than the previously reported cross sections

1995-10-02

342

Search of truncation of (N-1) electron basis containing full connected triple excitations in computing main and satellite ionization potentials via Fock-space coupled cluster approach.  

UK PubMed Central (United Kingdom)

A valence-universal multireference coupled cluster (VUMRCC) theory, realized via the eigenvalue independent partitioning (EIP) route, has been implemented with full inclusion of triples excitations for computing and analyzing the entire main and several satellite peaks in the ionization potential spectra of several molecules. The EIP-VUMRCC method, unlike the traditional VUMRCC theory, allows divergence-free homing-in to satellite roots which would otherwise have been plagued by intruders, and is thus numerically more robust to obtain more efficient and dependable computational schemes allowing more extensive use of the approach. The computed ionization potentials (IPs) as a result of truncation of the (N-1) electron basis manifold involving virtual functions such as 2h-p and 3h-2p by different energy thresholds varying from 5 to 15 a.u. with 1 a.u. intervals as well as thresholds such as 20, 25, and 30 a.u. have been carefully looked into. Cutoff at around 25 a.u. turns out to be an optimal threshold. Molecules such as C2H4 and C2H2 (X = D,T), and N2 and CO (X = D,T,Q) with Dunning's cc-pVXZ bases have been investigated to determine all main and 2h-p shake-up and 3h-2p double shake-up satellite IPs. We believe that the present work will pave the way to a wider application of the method by providing main and satellite IPs for some problematic N-electron closed shell systems.

Adhikari K; Chattopadhyay S; De BK; Sharma A; Nath RK; Sinha D

2013-06-01

343

Recent results on new particle searches at PETRA  

International Nuclear Information System (INIS)

Recent searches for new particles at PETRA are reviewed. Results on heavy lepton searches (charged and neutral), supersymmetry searches (SUSY partners of the electron, the photon, the W and Z gauge bosons, and the Higgs), and on searches for compositeness (excited leptons and leptoquarks) are presented. (orig.)

1986-01-01

344

It's Only A Matter of Time (Reversal): A New Search For The Electric Dipole Moment Of The Neutron  

International Nuclear Information System (INIS)

An international collaboration has undertaken a project to search for the electric dipole moment (EDM) of the neutron with a sensitivity of 10-28 e·cm. The search should span a region of sensitivity where effects are expected from supersysmmetric models and from models of time reversal violation that might explain electroweak baryogenesis. The technique utilizes the special properties for producing and storing ultra-cold neutrons in a bottle filled with liquid 4He and doped with a small amount of 3He. The technique will be discussed and compared to that of competing experiments. The extensive R and D program undertaken by the collaboration will be reviewed. The status of the DOE project will be explained

2007-10-26

345

Searching for a New Way to Reach Patrons: A Search Engine Optimization Pilot Project at Binghamton University Libraries  

Science.gov (United States)

|Search engine use is one of the most popular online activities. According to a recent OCLC report, nearly all students start their electronic research using a search engine instead of the library Web site. Instead of viewing search engines as competition, however, librarians at Binghamton University Libraries decided to employ search engine…

Rushton, Erin E.; Kelehan, Martha Daisy; Strong, Marcy A.

2008-01-01

346

Hash Based Searching Algorithm  

Directory of Open Access Journals (Sweden)

Full Text Available Over the years, computer scientist participated research on linear search and Binary Search to find that which one is faster. These are two searching technique the condition of binary search array must be sorted order but in linear search that is not necessary. But in this paper proposed a new searching algorithm which is applicable for both sorted and unsorted array because in this paper we proposed Hash based searching technique for searching elements in the given array.

JYOTIRMAYEE RAUTARAY; RAGHVENDRA KUMAR

2013-01-01

347

Web Search Engines: Search Syntax and Features.  

Science.gov (United States)

|Presents a chart that explains the search syntax, features, and commands used by the 12 most widely used general Web search engines. Discusses Web standardization, expanded types of content searched, size of databases, and search engines that include both simple and advanced versions. (LRW)|

Ojala, Marydee

2002-01-01

348

Turning Search into Knowledge Management.  

Science.gov (United States)

Discussion of knowledge management for electronic data focuses on creating a high quality similarity ranking algorithm. Topics include similarity ranking and unstructured data management; searching, categorization, and summarization of documents; query evaluation; considering sentences in addition to keywords; and vector models. (LRW)

Kaufman, David

2002-01-01

349

Search for new physics in electron-tau final states in proton - antiproton collisions at 1.96 TeV  

Energy Technology Data Exchange (ETDEWEB)

During the last decades, particle physicists have studied the tiniest building blocks of matter--the quarks and the leptons--and the forces between them in great detail. From these experiments, a theoretical framework has been built that describes the observed results with high precision. The achievement of this theory, which is referred to as the Standard Model of elementary particle physics, was the elaboration of a unified description of the strong, weak and electromagnetic forces in the framework of quantum gauge-field theories. Moreover, the Standard Model combines the weak and electromagnetic forces in a single electroweak gauge theory. The fourth force which is realized in nature, gravity, is too weak to be observable in laboratory experiments carried out in high-energy particle physics and is not part of the Standard Model. Although the Standard Model has proven highly successful in correlating a huge amount of experimental results, a key ingredient is as yet untested: the origin of electroweak symmetry breaking. Currently, the only viable ansatz that is compatible with observation is the Higgs mechanism. It predicts the existence of a scalar particle, called the Higgs boson, and the couplings to the fundamental Standard Model particles, however not its mass. An upper limit on the mass of the Higgs boson of {approx} 1 TeV can be inferred from unitarity arguments. One of the key tasks of particle physics in the next years will be to verify the existence of this particle. The introduction of an elementary scalar particle in a quantum field theory is highly problematic. The Higgs boson mass is subject to large quantum corrections, which makes it difficult to understand how its mass can be less than a TeV as required by theory. In addition, the Standard Model does not provide an answer to fundamental questions like the values of free parameters of the model, the pending integration of gravity or the evolution of the coupling constants of the fundamental forces at large energy regimes. Hence there are strong reasons to believe that the Standard Model is only a low-energy approximation to a more fundamental theory. One of the best studied candidates for an extension of the Standard Model is supersymmetry, which predicts the existence of a supersymmetric partner for each fundamental particle that differs only in spin. To allow different masses for Standard Model particles and their corresponding supersymmetric partners, supersymmetry must be broken. The mechanism behind supersymmetry breaking is currently unknown, however, various hypotheses exist. Supersymmetric models do not only solve the problem of the large quantum corrections to the Higgs boson mass, but they also allow the unification of the coupling constants at a common scale. In addition, certain supersymmetric models provide a suitable candidate for cold dark matter, which represents a large fraction of mass in our universe. Searches for supersymmetric particles have been performed by the four LEP experiments (ALEPH, DELPHI, L3, OPAL) up to the kinematic limit. Since no evidence for supersymmetric particles has been found, lower limits on their masses have been derived. The search for supersymmetry is now continuing at the Tevatron collider, located at the Fermi National Accelerator Laboratory in Batavia, Illinois. Two dedicated detector systems, CDF and D0, are installed at the Tevatron to analyze proton-antiproton collisions at a center-of-mass energy of 1.96 TeV. A particular promising discovery channel for supersymmetry within the Tevatron energy range is the trilepton channel. In this channel, the lighter supersymmetric partners of the Higgs and gauge bosons, the charginos and neutralinos, decay into final states with leptons or hadrons and missing energy. Using the leptonic final states, the signal can be separated from the large Standard Model background. Supersymmetry requires an extension of the Standard Model Higgs sector, leading to more than one neutral Higgs boson. Enhanced couplings result in sizable cross sections for Higgs boson production, an

Noeding, Carsten; /Freiburg U.

2006-04-01

350

Search for  

UK PubMed Central (United Kingdom)

We have searched for associated production of the lightest chargino, f W 1 ,and next-to-lightest neutralino, e Z 2 , of the Minimal Supersymmetric StandardModel in p¯p collisions atps = 1.8 TeV using the DØ detector atthe Fermilab Tevatron collider. Data corresponding to an integrated luminosityof 12.5Sigma0:7 pbGamma1were examined for events containing three isolatedleptons. No evidence forf W 1e Z 2 pair production was found. Limits onoe( f W 1e Z 2 )Br( f W 1 ! l e Z 1 )Br( e Z 2 ! l¯l e Z 1 ) are presented.Submitted to the Physical Review LettersTypeset using REVTEXSupersymmetry (SUSY) is a symmetry which relates bosons and fermions [?]. Supersymmetricextensions of the Standard Model (SM) are attractive because they remove the"fine tuning" problem associated with loop corrections to the mass of the Higgs boson andprovide a basis for gauge coupling unification at a high mass scale. One consequence ofthese models is the introduction of a SUSY par...

S. Abachi; M. Abolins; I. Adam; H. Aihara; J. Alitti

351

Search for $\  

CERN Document Server

We discuss the performance of a next generation $\\osc$ oscillation experiment, based on a target consisting of a sandwich of nuclear emulsion layers and silicon detectors. The target would be followed by a full spectrometer for energy-momentum measurement and particle identification. A $\\tau-$enriched sample is selected in terms of vertex and kinematical criteria using the electronic spectrometer, with very high efficiency, while at the same time reducing the load of background events to be scanned by up to two orders of magnitude. Events fulfilling the selection criteria are very efficiently located and scanned in the emulsion, thanks to the very good resolution allowed by the silicon tracker. In terms of the two-neutrino families mixing angle, this experiment could reach a sensitivity of $\\sint < 1.1 \\times 10^{-5}$ in an extended run at CERN and up to $\\sint < 3.2 \\times 10^{-6}$ at FNAL.

Gómez-Cadenas, J J

1996-01-01

352

Search for $\  

CERN Multimedia

The OPERA experiment in the underground Gran Sasso Laboratory (LNGS) has been designed to perform the first detection of neutrino oscillations in direct appearance mode in the muon neutrino to tau neutrino channel. The detector is hybrid, being made of an emulsion/lead target and of electronic detectors. It is placed in the CNGS neutrino beam 730 km away from the neutrino source. Runs with CNGS neutrinos were successfully carried out in 2008, 2009, and 2010. After a brief description of the beam and the experimental setup, we report on event analysis of a sample of events corresponding to 1.89\\times 10^{19} p.o.t. in the CERN CNGS \

Kose, Umut

2012-01-01

353

A Search For Associated Chargino-neutralino Production In The Electron Pair + X Meson + Missing Transverse Momentum Energy And Electron-mu + X Meson + Missing Transverse Momentum Energy Channels In The 1994 - 1996 Tevatron Run Using The Dzero Detecto  

CERN Document Server

A search for associated chargino-neutralino production has been performed with the DØ detector at the Fermi National Accelerator Laboratory at a center-of-mass energy of 1.8 TeV in the ee + X + E /T and e? + X + E /T channels. About 100 pb?1 of data was analyzed in each channel. The observed number of events is consistent with the Standard Model background. Assuming that R-parity is conserved, and that the c&d5;± 1 and c&d5;02 masses are each about twice the c&d5;01 mass, a limit was set on the c&d5;± 1c&d5;0 2 production cross-section times the branching fraction of c&d5;02 to a dilepton final state. This limit ranges from 1.0 pb at a c&d5;± 1 mass of 61 GeV to 0.3 pb for a c&d5;± 1 mass of 124 GeV, assuming that the c&d5;± 1 also decays 100% of the time to a leptonic final state. Assuming instead that the c&d5;± 1 decays 100% of the time to...

Goss, L T

2001-01-01

354

Algorithmic Basics of Search Engine Development  

Science.gov (United States)

The basics of search engines development are reviewed in this report. A structure of search engine as a part of an electronic library is offered. Methods of smart search of relevant information based on multi-agent systems and document processing methods are reviewed in the report. Analysis of major problems of processing, indexing and relevance evaluation is carried out. Statistical indexing, algebraic relevance evaluation and linguistic automaton construction for effective document processing and understanding are considered.

Tregubov, A. A.; Kononova, T. S.

355

Search for dark matter at lep  

International Nuclear Information System (INIS)

[en] A reported is presented on new particle searches done at the Large Electron Positron Collider (LEP) in the recent years. Special emphasis will be given on results relevant to the dark matter composition of the universe. (author)

1996-01-01

356

Experiment search of the electroweak symmetry breaking in the H ? ?? channel and of a solution of the hierarchy problem in the Atlas experiment: participation to the tests of the electronics of the electromagnetic calorimeter  

International Nuclear Information System (INIS)

This thesis deals with the understanding of the spontaneous electroweak symmetry breaking mechanism in the ATLAS experiment at LHC collider, by studying two complementary topics: the search for the Higgs boson in the H ? ?? channel, and a search for extra dimensions in the gluon sector. Tests of the electronic of the electromagnetic calorimeter allowed us to validate various cards that were under the responsibility of the LPNHE. Using full simulation data of the detector allowed us to precisely compute mass resolution of the di-photon system. Due to recent theoretical improvements, signal and background have been studied at the next order of the perturbative development, which increases cross-sections. With regards to the jet background, a study has been done using discriminating variables in order to obtain, for a 80 % photons efficiency, a rejection factor of 7000. The discovery potential benefits from this change of cross-sections and increases by 50 % in comparison with the same analysis done at the leading order. In addition to this, a new analysis using a maximum likelihood method allowed us to increase by 40 % the discovery potential in comparison with our classical analysis. In conclusion, the Higgs boson of 120 GeV/c2 can be now discovered in this channel with an integrated luminosity of 10 fb-1. Furthermore, the consistency of the problem of the Higgs boson mass can be solved by a dimensions in which gluons can propagate. We have shown that it was possible to discover extra-dimensions up to a compactification scale of 15 TeV. (author)

2005-01-01

357

Electronic records' 1.4 m pounds annual saving.  

Science.gov (United States)

The St. Helens & Knowsley Teaching Hospitals NHS Trust says it has reached a significant milestone in a major project via which it aims to cease completely using paper-based patient records and other patient-related information such as discharge summaries and X-ray results by converting all such documentation to online electronic form. With the purchase of three Kodak high-speed document scanners, which digitise the files, and a tailored version of C Cube Solutions' electronic document management software (EDMS), all 27 hospital departments at the Trust's two main acute hospitals have now "gone live" with the radical new system for medical records, and, as HEJ editor Jonathan Baillie reports, preparations are in hand to convert other important patient documentation into electronic form. PMID:21485320

Baillie, Jonathan

2011-03-01

358

Electronic records' 1.4 m pounds annual saving.  

UK PubMed Central (United Kingdom)

The St. Helens & Knowsley Teaching Hospitals NHS Trust says it has reached a significant milestone in a major project via which it aims to cease completely using paper-based patient records and other patient-related information such as discharge summaries and X-ray results by converting all such documentation to online electronic form. With the purchase of three Kodak high-speed document scanners, which digitise the files, and a tailored version of C Cube Solutions' electronic document management software (EDMS), all 27 hospital departments at the Trust's two main acute hospitals have now "gone live" with the radical new system for medical records, and, as HEJ editor Jonathan Baillie reports, preparations are in hand to convert other important patient documentation into electronic form.

Baillie J

2011-03-01

359

MEDICAL FAILURE PATTERN SEARCH ENGINE  

UK PubMed Central (United Kingdom)

A patient safety search engine (18) and alarm processor is programmed to repetitively search the electronic medical records of all patients in a hospital system to automatically provide early detection of patients with evolving pathophysiologic cascades, and in particular the cascades of evolving death, such as cascades of septic shock. The search engine (18) also searches for a wide range of evolving pathophysiologic failures which are commonly fatal if detected too late. An alarm processor is provided which is programmed to provide an alarm upon the detection of a cascade or failure. The processor (18) is further be programmed to provide an image of the cascade, and to determine the severity of the cascade, and the time of onset of the cascade in relation to the timing and type of procedures and treatment and the increased cost associated with the cascade. Discretionary real-time system-wide searches for a wide range of clinical failure patterns or images within the hospital system may be performed using the disclosed patient safety search engine (18).

LYNN LAWRENCE A; LYNN ERIC N

360

An Improved Search for the Neutron Electric Dipole Moment  

CERN Document Server

A permanent electric dipole moment of fundamental spin-1/2 particles violates both parity (P) and time re- versal (T) symmetry, and hence, also charge-parity (CP) symmetry since there is no sign of CPT-violation. The search for a neutron electric dipole moment (nEDM) probes CP violation within and beyond the Stan- dard Model. The experiment, set up at the Paul Scherrer Institute (PSI), an improved, upgraded version of the apparatus which provided the current best experimental limit, dn < 2.9E-26 ecm (90% C.L.), by the RAL/Sussex/ILL collaboration: Baker et al., Phys. Rev. Lett. 97, 131801 (2006). In the next two years we aim to improve the sensitivity of the apparatus to sigma(dn) = 2.6E-27 ecm corresponding to an upper limit of dn < 5E-27 ecm (95% C.L.), in case for a null result. In parallel the collaboration works on the design of a new apparatus to further increase the sensitivity to sigma(dn) = 2.6E-28 ecm.

Burghoff, M; Ban, G; Lefort, T; Lemiere, Y; Naviliat-Cuncic, O; Pierre, E; Quemener, G; Zejma, J; Kasprzak, M; Knowles, P; Weis, A; Pignol, G; Rebreyend, D; Afach, S; Bison, G; Becker, J; Severijns, N; Roccia, S; Plonka-Spehr, C; Zennerz, J; Heil, W; Koch, H C; Kraft, A; Lauer, T; Sobolev, Yu; Chowdhuri, Z; Krempel, J; Lauss, B; Mtchedlishvili, A; Schmidt-Wellenburg, P; Zsigmond, G; Fertl, M; Franke, B; Horras, M; Kirch, K; Piegsa, F

2011-01-01

 
 
 
 
361

An Improved Limit on the Electric Dipole Moment of the Muon  

CERN Document Server

Data from the muon g-2 experiment at Brookhaven National Lab has been analyzed to search for a muon electric dipole moment(EDM), which would violate parity and time reversal symmetries. An EDM would cause a tilt in the spin precession plane of the muons, resulting in a vertical oscillation in the position of electrons hitting the detectors. No signal has been observed. Based on this analysis, an improved limit of $2.8 \\times 10^{-19} e-cm(95% CL) is set on the muon EDM.

McNabb, R

2004-01-01

362

Search for Single Top Production at HERA  

CERN Document Server

A search for single top production in ep collisions using the complete high energy data from HERA is presented. This search is based on the analysis of events containing isolated leptons (electrons or muons) and missing transverse momentum PTmiss. In the absence of a signal, an upper limit on the top production cross section sigma_ep -> etX < 0.16 pb is established at the 95% confidence level, corresponding to an upper bound on the anomalous magnetic coupling kappa_tug < 0.14. The search is complemented by a search for events containing an isolated tau lepton and PTmiss and the measurement of W boson polarisation fractions.

Brandt, Gerhard

2008-01-01

363

Search for unstable photinos  

International Nuclear Information System (INIS)

[en] We have searched in e+e--annihilation for the photino, the partner of the photon, which is predicted by supersymmetry. Photinos can be pair produced in e+e- annihilation by the exchange of a scalar electron, the partner of the electron. It was assumed that the photino is unstable and decays in a photon and a lighter supersymmetric particle. This second particle leaves the detector unobserved. In the final state one sees then two photons with missing energy and missing momentum. The data were taken with the detector CELLO at the e+e- storage ring PETRA at DESY, Hamburg. The CMS energy was between 38.3 GeV and 46.8 GeV, the total luminosity was 38.3 pb-1. The liquid argon lead calorimeter of CELLO, the most important part for this analysis, is specialised for the measurement of electromagnetic showers. It has a good space resolution and covers 96% of the solid angle of 4?. We have selected events with 2 photons in the central calorimeter, both with an energy of more than 2 GeV. The high background due to cosmic showers was reduced by accepting only events which were correlated to the time of the e+e- annihilation. Also the direction of the showers had to point to the interaction point. The applied cuts accepted the expected events with a probability P?0.3. No event was found which was compatible with the production of unstable photinos. One can give limits on the mass of the photino, which depend on the mass of the scalar electron and on the decay path of the photino. In the simplest case, if all photinos decay at the interaction point, photinos with masses below 21 GeV are excluded (with a mass of the scalar electron below 40 GeV). (orig.)

1987-01-01

364

A Search on Two-Electron Atoms  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Using the basic ingredient of two-body problem, we propose accurate algebraic solutions in a closed form for the ground state of helium and helium-like atoms. These simple but explicit expressions involve exact screening parameters for each system considered and provide an insight into their physica...

Mustafa Çapak; Bülent Gönül

365

A Search on Two-Electron Atoms  

Directory of Open Access Journals (Sweden)

Full Text Available Using the basic ingredient of two-body problem, we propose accurate algebraic solutions in a closed form for the ground state of helium and helium-like atoms. These simple but explicit expressions involve exact screening parameters for each system considered and provide an insight into their physical structure. The energy eigenvalues have been exactly calculated for atoms with nuclear charge Z in the range 1 ? Z ? 12, clarifying the relation between the screening parameteter and Z.

Mustafa Çapak; Bülent Gönül

2011-01-01

366

Literature search in medical publications.  

UK PubMed Central (United Kingdom)

The quality of a medical publication rests as much on the research paper as on the literature search prior to writing for publication. The art of literature search and its importance to the various steps in scientific writing have been emphasised in this paper. Many medical authors in West African sub-region learned the art of publishing research work through their senior professional colleagues or by trial and error through the peer review experience of their work. This article is expected to fill this gap in training. It should guide trainee specialists or new entrants, who must do literature search towards publishing research works for earning promotion, advancing knowledge, obtaining grants and fellowship awards, into the "publish or perish" syndrome existing in academic institutions. The current trend of electronic writing has called for a new style of referencing in medical publications, which has been suggested in this paper.

Solagberu BA

2002-10-01

367

Light WIMP search in XMASS  

CERN Document Server

A search for light dark matter using low-threshold data from the single phase liquid xenon scintillation detector XMASS, has been conducted. Using the entire 835 kg inner volume as target, the analysis threshold can be lowered to 0.3 keVee (electron-equivalent) to search for light dark matter. With low-threshold data corresponding to a 5591.4 kg$\\cdot$day exposure of the detector and without discriminating between nuclear-recoil and electronic events, XMASS sets an upper limit on the WIMP-nucleon cross section for WIMPs with masses below 20 GeV and excludes part of the parameter space allowed by other experiments.

Abe, K; Hiraide, K; Hirano, S; Kishimoto, Y; Kobayashi, K; Moriyama, S; Nakagawa, K; Nakahata, M; Ogawa, H; Oka, N; Sekiya, H; Suzuki, A Shinozaki Y; Takeda, A; Takachio, O; Ueshima, K; Umemoto, D; Yamashita, M; Yang, B S; Tasaka, S; Liu, J; Martens, K; Hosokawa, K; Miuchi, K; Murata, A; Onishi, Y; Otsuka, Y; Takeuchi, Y; Kim, Y H; Lee, K B; Lee, M K; Lee, J S; Fukuda, Y; Itow, Y; Masuda, K; Nishitani, Y; Takiya, H; Uchida, H; Kim, N Y; Kim, Y D; Kusaba, F; Motoki, D; Nishijima, K; Fujii, K; Murayama, I; Nakamura, S

2012-01-01

368

Sure success partial search  

CERN Document Server

Partial search has been proposed recently for finding the target block containing a target element with fewer queries than the full Grover search algorithm which can locate the target precisely. Since such partial searches will likely be used as subroutines for larger algorithms their success rate is important. We propose a partial search algorithm which achieves success with unit probability.

Choi, B S; Braunstein, S L; Choi, Byung-Soo; Walker, Thomas A.; Braunstein, Samuel L.

2006-01-01

369

Search engine credibility  

Digital Repository Infrastructure Vision for European Research (DRIVER)

While search engines have become increasingly popular over the past years, little research is concerned with how they attend to credibility. Through interviews with six Norwegian search engine companies; this study reveals how search engines attend to areas affecting credibility. Search engines appe...

Floden,Asbjørn

370

Recommending search experiences  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In this paper we focus on a multi-case case-based reasoning system to support users during collaborative search tasks. In particular we describe how repositories of search experiences/knowledge can be recommended to users at search time. These recommendations are evaluated using real-world search da...

Saaya, Zurina; Smyth, Barry; Coyle, Maurice; Briggs, Peter

371

Uso de fluidos dieléctricos a base de aceites en maquinado por descargas eléctricas por penetración/ Case Study for the Use of Vegetable Dielectric Fluid in Die-Sink Electro Discharge Machining (EDM)  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish En procesos de mecanizado por descarga eléctrica EDM (Electro Dischage Machining) el fluido dieléctrico normalmente está compuesto por derivados del petróleo. El objetivo de este trabajo es evaluar fluidos alternativos a los tradicionales. En este contexto, fueron analizados 5 fluidos dieléctricos de origen vegetal, comparándolos con el desempeño de kerosene y aceite mineral. El material mecanizado fue acero rápido M2, usando parámetros de desbaste para electrodo (more) s de cobre y grafito. Fueron medidas las tasas de remoción de material (TMR), el desgaste de los electrodos, la rugosidad y la morfología de la superficie mecanizada. Los dieléctricos de origen vegetal presentaron un desempeño competitivo usando electrodos de cobre y grafito. Abstract in english EDM process commoly use petroleum based died fuids. The aim of this work is to evaluate alternative fuids to traditional mineral ones. It was analyzed 5 different dielectric fuids derived of seeds. They were compared with kerosene and a mineral oil. The workpiece was speed-steel M2. The machining parameters were preestablished for working with copper and graphite electrodes. The material removal rate, the wear rate of the electrodes, the finishing and morphology of machin (more) ed surface were all measured. Vegetable based oils showed a competitive performance using cooper and graphite electrodes when compared with mineral based oils.

Suarez Paipa, Mauro; Montandon, Renato Lima; Raslan, Alberto Arnaldo

2012-06-01

372

Large Neighborhood Search  

DEFF Research Database (Denmark)

Heuristics based on large neighborhood search have recently shown outstanding results in solving various transportation and scheduling problems. Large neighborhood search methods explore a complex neighborhood by use of heuristics. Using large neighborhoods makes it possible to find better candidate solutions in each iteration and hence traverse a more promising search path. Starting from the large neighborhood search method,we give an overview of very large scale neighborhood search methods and discuss recent variants and extensions like variable depth search and adaptive large neighborhood search.

Pisinger, David; RØpke, Stefan

2010-01-01

373

Searches for excited fermions in ep collisions at HERA  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Searches in ep collisions for heavy excited fermions have been performed with the ZEUS detector at HERA. Excited states of electrons and quarks have been searched for in e(+)p collisions at a centre-of-mass energy of 300 GeV using an integrated luminosity of 47.7 pb(-1). Excited electrons have been ...

Chekanov, S; Derrick, M; Krakauer, D; Magill, S; Musgrave, B; Pellegrino, A; Repond, J; Yoshida, R; Mattingly, M C K

374

First observation of new effects at the set-up for searching for a neutron electric dipole moment by a crystal-diffraction method  

CERN Document Server

First observation of new effects was carried out using the set-up created for searching for a neutron electric dipole moment (EDM) by a crystal-diffraction method. For the first time the neutron dynamical Laue diffraction for the Bragg angles close to a right angle (up to 87 ) was studied, using the direct diffraction beam and a thick (propor to 3.5-cm) crystal. The effect of an essential time delay of diffracting neutrons inside the crystal for Bragg angles close to 90 was experimentally observed, using a time-of-flight method. The phenomenon of neutron-beam depolarization was first experimentally observed for the case of Laue diffraction in a noncentrosymmetric alpha-quartz crystal. It is experimentally proved that the interplanar electric field, affecting a neutron in a crystal, maintains its value up to Bragg angles equal to 87 . These results confirm the opportunity to increase by more than an order of magnitude the sensitivity of the method to the neutron EDM, using the diffraction angles close to 90 , ...

Fedorov, V V; Semenikhin, S Y; Voronin, V V

2002-01-01

375

First observation of new effects at the set-up for searching for a neutron electric dipole moment by a crystal-diffraction method  

Energy Technology Data Exchange (ETDEWEB)

First observation of new effects was carried out using the set-up created for searching for a neutron electric dipole moment (EDM) by a crystal-diffraction method. For the first time the neutron dynamical Laue diffraction for the Bragg angles close to a right angle (up to 87 ) was studied, using the direct diffraction beam and a thick ({proportional_to}3.5-cm) crystal. The effect of an essential time delay of diffracting neutrons inside the crystal for Bragg angles close to 90 was experimentally observed, using a time-of-flight method. The phenomenon of neutron-beam depolarization was first experimentally observed for the case of Laue diffraction in a noncentrosymmetric {alpha}-quartz crystal. It is experimentally proved that the interplanar electric field, affecting a neutron in a crystal, maintains its value up to Bragg angles equal to 87 . These results confirm the opportunity to increase by more than an order of magnitude the sensitivity of the method to the neutron EDM, using the diffraction angles close to 90 , and give a real prospect to exceed the sensitivity of the magnetic resonance method, using ultra-cold neutrons. (orig.)

Fedorov, V.V.; Lapin, E.G.; Semenikhin, S.Y.; Voronin, V.V. [Petersburg Nuclear Physics Institute, Gatchina, 188300 St.Petersburg (Russian Federation)

2002-07-01

376

Characterizing Search Spaces For Tabu Search  

UK PubMed Central (United Kingdom)

A large number of heuristic search algorithms are available for function optimization. Each ofthese heuristics, e.g., simulated annealing, genetic algorithms, tabu search, etc., has been shownto be effective at finding good solutions efficiently. However, little work has been directed atdetermining what are the important problem characteristics for which one algorithm is more efficientthan the others. By examining two problems, the location--allocation problem and the quadraticassignment problem, characteristics of successful tabu search are illustrated. A tabu searchfor the location--allocation problem is described and implemented. The results of this tabu searchare compared against a genetic algorithm. For the quadratic assignment problem, tabu search hasbeen shown more effective than genetic algorithms; however, for the location--allocation problem,the genetic algorithm finds better solutions more efficiently than tabu search. To investigate whatcharacteristics of the loca...

Christopher R. Houck; Jeffrey A. Joines; Michael G. Kay

377

Tom Mertens EDM, Wetenschapspark 2  

UK PubMed Central (United Kingdom)

sium on Rendering, Norrkoping, Sweden, June 21-23, 2004.E#cient Rendering of Local Subsurface Scattering, by Tom Mertens, Jan Kautz,Philippe Bekaert, Frank Van Reeth and Hans-Peter Seidel. In proceedings of PacificGraphics, Canmore, Canada, October 8-10, 2003.Interactive Rendering of Translucent Deformable Objects, by Tom Mertens, JanKautz, Philippe Bekaert, Hans-Peter Seidel and Frank Van Reeth. In proceedingsof Eurographics Symposium on Rendering, Leuven, Belgium, June 25-27, 2003.An Image-Based Radiosity Representation, by Tom Mertens and Frank Van Reeth.In proceedings of Image and Vision Computing New Zealand, Dunedin, New Zealand,November 26-28, 2001.-- ThesesLicentiate Thesis: Interactive Radiosity, A Study of Hardware Acceleration and SoftShadow Computation, by Tom Mertens, June 2001, Limburgs Universitair Centrum.-- MiscellaneousA self-Shadow Algorithm for Dynamic Hair using Density Clustering, technicalsketch at SIGGRAPH, Los Angeles, CA, August 8

Tom Mertens; Centrum Diepenbeek Belgium

378

An intelligent method for geographic Web search  

Science.gov (United States)

While the electronically available information in the World-Wide Web is explosively growing and thus increasing, the difficulty to find relevant information is also increasing for search engine user. In this paper we discuss how to constrain web queries geographically. A number of search queries are associated with geographical locations, either explicitly or implicitly. Accurately and effectively detecting the locations where search queries are truly about has huge potential impact on increasing search relevance, bringing better targeted search results, and improving search user satisfaction. Our approach focus on both in the way geographic information is extracted from the web and, as far as we can tell, in the way it is integrated into query processing. This paper gives an overview of a spatially aware search engine for semantic querying of web document. It also illustrates algorithms for extracting location from web documents and query requests using the location ontologies to encode and reason about formal semantics of geographic web search. Based on a real-world scenario of tourism guide search, the application of our approach shows that the geographic information retrieval can be efficiently supported.

Mei, Kun; Yuan, Ying

2008-11-01

379

Higgs searches with ATLAS  

CERN Document Server

Higgs boson searches in the Standard Model, the Minimal Supersymmetric Standard Modell and Next-to-Minimal Supersymmetric Standard Modell are presented. The searches are based on data taken in 2010. Exclusion limits in all channels are established.

Moeser, N; The ATLAS collaboration

2011-01-01

380

Improved limited discrepancy search  

Energy Technology Data Exchange (ETDEWEB)

We present an improvement to Harvey and Ginsberg`s limited discrepancy search algorithm, which eliminates much of the redundancy in the original, by generating each path from the root to the maximum search depth only once. For a complete binary tree of depth d this reduces the asymptotic complexity from O(d+2/2 2{sup d}) to O(2{sup d}). The savings is much less in a partial tree search, or in a heavily pruned tree. The overhead of the improved algorithm on a complete binary tree is only a factor of b/(b - 1) compared to depth-first search. While this constant factor is greater on a heavily pruned tree, this improvement makes limited discrepancy search a viable alternative to depth-first search, whenever the entire tree may not be searched. Finally, we present both positive and negative empirical results on the utility of limited discrepancy search, for the problem of number partitioning.

Korf, R.E. [Univ. of California, Los Angeles, CA (United States)

1996-12-31

 
 
 
 
381

Searches for new particles at PEP  

International Nuclear Information System (INIS)

The status of searches for new particles at the PEP storage ring is reviewed. The result of the excited electron search by MARKII is presented and a limit on the coupling strength of the e*e? vertex is given. The search for single photons in the ASP and MAC detectors is reported and the results are used to set limits on the number of light neutrino species and, in the context of supersymmetry (SUSY) theories, are interpreted as setting simultaneous limits on the masses of the selectron and photino

1986-01-01

382

Web Search page  

Science.gov (United States)

The Web Search page is another collection of all the major search engines and directories, but with graphic representations which may make it more fun to have in your bookmarks. A text version is also provided which includes even more search engines, resulting in a new feeling of being overwhelmed.

383

Faceted Semantic Search for Personalized Social Search  

CERN Multimedia

Actual social networks (like Facebook, Twitter, Linkedin, ...) need to deal with vagueness on ontological indeterminacy. In this paper is analyzed the prototyping of a faceted semantic search for personalized social search using the "joint meaning" in a community environment. User researches in a "collaborative" environment defined by folksonomies can be supported by the most common features on the faceted semantic search. A solution for the context-aware personalized search is based on "joint meaning" understood as a joint construal of the creators of the contents and the user of the contents using the faced taxonomy with the Semantic Web. A proof-of concept prototype shows how the proposed methodological approach can also be applied to existing presentation components, built with different languages and/or component technologies.

Mas, Massimiliano Dal

2012-01-01

384

Search for neutrino oscillations  

International Nuclear Information System (INIS)

[en] The present paper reports on preliminary results from the E 816 experiment at Brookhaven National Laboratory. E 816 is the continuation of a 1984 experiment (PS 191) which was devoted to a neutrino decay search in the CERN PS neutrino beam. No candidate was seen, but a study of neutrino interactions in the calorimeter indicated an anomalous electron production. The statistics was too low and the experiment has been rerun in spring 86 at BNL to look specifically, with an improved detector for nu/sub e/ arising from a low energy nu/sub ?/ beam. The results presented here are preliminary for at least two reasons: first the collaboration is presently running a calibration test which results are not included here; second, only 1/3 of the neutrino data is used, and no mention will be made to antineutrino data for which the analysis is still going on. This report will directly start with a description of our apparatus, followed by the data analysis

1987-01-01

385

The search for top at CDF  

International Nuclear Information System (INIS)

We present results on the search for the top quark in bar pp collisions at ?s = 1.8 TeV. The data sample collected during the 1988--89 run with the Collider Detector at Fermilab (CDF) includes more than 4 pb-1. We report here on an extension of previously published searches for the top quark in electron + jets and the dilepton channel electron-muon. The 95% confidence level limit on the top mass is 89 GeV/c2

1991-01-01

386

Visual search enhances subsequent mnemonic search.  

Science.gov (United States)

We examined how the performance of a visual search task while studying a list of to-be-remembered words affects subsequent memory for those words by humans. Previous research had suggested that episodic context encoding is facilitated when the study phase of a memory experiment requires, or otherwise encourages, a visual search for the to-be-remembered stimuli, and theta-band oscillations are more robust when animals are searching their environment. Moreover, hippocampal theta oscillations are positively correlated with learning in animals. We assumed that a visual search task performed during the encoding of words for a subsequent memory test would induce an exploratory state that would mimic the one that is induced in animals when performing exploratory activities in their environment, and that the encoding of episodic traces would be improved as a result. The results of several experiments indicated that the performance of the search task improved free recall, but the results did not extend to yes-no or forced choice recognition memory testing. We propose that visual search tasks enhance the encoding of episodic context information but do not enhance the encoding of to-be-remembered words. PMID:22961740

Westfall, Holly A; Malmberg, Kenneth J

2013-02-01

387

The Heavy Photon Search Experiment  

CERN Document Server

Interest in new physics models including so-called hidden sectors has increased in recent years as a result of anomalies from astrophysical observations. The Heavy Photon Search (HPS) experiment proposed at Jefferson Lab will look for a mediator of a new force, a GeV-scale massive U(1) vector boson, the Heavy Photon, which acquires a weak coupling to electrically charged matter through kinetic mixing. The HPS detector, a large acceptance forward spectrometer based on a dipole magnet, consists of a silicon tracker-vertexer, a lead-tungstate electromagnetic calorimeter, and a muon detector. HPS will search for the e+e- or mu+mu- decay of the Heavy Photon produced in the interaction of high energy electrons with a high Z target, possibly with a displaced decay vertex. In this article, the description of the detector and its sensitivity are presented.

Adrian, Per Hansson

2013-01-01

388

Basics of online searching  

Energy Technology Data Exchange (ETDEWEB)

The purpose of this book is to teach the principles of interactive bibliographic searching, or information retrieval to those with little or no prior experience. The major intended audiences are students, working information specialists and librarians, and end users, the people for whom all the searching is done. Material covers such topics as the nature of online searching, the kinds of files available online, the commands used to search for them, and the strategy used to perform a search - with numerous examples from real systems presented.

Meadow, C.T.; Cochrane, P.A.

1981-01-01

389

Search for solar axions  

Science.gov (United States)

Peccei and Quinn proposed an elegant solution for restoring CP symmetry to the QCD Lagrangian [37]. This method includes an additional global U(1) symmetry included in the QCD Lagrangian which is spontaneously broken at a high energy scale, fa. Breaking the symmetry generates a Nambu-Goldstone boson called the axion. Although there are various detection mechanisms that search for the axion, this thesis focuses on the the axio-electric effect. The axio-electric is similar to the photo-electric effect in that an axion is absorbed by an atom which subsequently emits an electron. The electron's energy is equivalent to the incoming axion energy minus the binding energy. The higher shell electrons immediately replenish the missing binding energy yielding a single energy peak at the incoming axion's energy. The 14.4 keV M1 transition of 57Fe is one possible axion source. The development of an optimum trigger algorithm has lowered the threshold for analysis in TeO2 bolometers to a few keV making an axion signature accessible to CUORE related R&D experiments such as the Chinese Crystal Validation Runs (CCVR) and Three Towers Test (TTT). These TeO2 crystal detectors have masses 750 and 790 grams, respectively. Each crystal has a stabilization heater and a germanium thermometer attached to its surface by an epoxy glue. The two previous experiments are R&D tests for the upcoming larger experiment, CUORE. CUORE will be made of 988 TeO2 crystals arranged in 19 towers with 13 floors each, each floor with 4 detectors. This thesis examined 87.01 kg·days of Three Towers data for an axion signal. A peak is observed in the region of interest with a statistical significance less than 1sigma over the expected background fluctuations, yielding a total background rate of 0.185 +/- 0.001 (Stat.) +/- 0.006 (Syst.) Counts/kg/day at 95% C.L. This places an experimental limit on the coupling constant fa of f a (S = 0.50) ? 1.16 x 106 GeV at 95% C.L. Projecting the TTT result to the CUORE mass and a five year run time we can expect a limit of fa(S = 0.50) ? 2.21 x 106 GeV at 95% C.L. Improvements in granularity can strengthen the bound on fa by 8% and 25% for background reductions by a factor of 2 and 10, respectively.

Newman, Seth Aaron

390

Paradoxes of unstable electron  

International Nuclear Information System (INIS)

The hypothesis that electron is unstable - when it is consistent with the vanishing mass of the photon- leads to a number of paradoxical statements. The lifetime of the electron is determined by emission of a huge number of longitudinal photons and exponentially depends on the amount of emitted energy. This suggests to discuss searches for charge nonconservation in experiments with high energy particles

1978-01-01

391

Search for supersymmetry at CDF  

International Nuclear Information System (INIS)

We have conducted a search for trilepton events from supersymmetry (SUSY) in p bar p collisions at ?s = 1.8 TeV. In the Supersymmetric Standard Model (MSSM), trilepton events are expected from chargino-neutralino (?1±?2-0) pair production, with subsequent decay into leptons. In all possible combinations of electron and muon channels in 19 pb-1 data, we observe no events which pass our trilepton selection criteria. Employing the GUT hypothesis within the framework of the MSSM, our preliminary excludes M(?1±) 2 c2 for -500

1994-01-01

392

Search for SUSY at CDF  

International Nuclear Information System (INIS)

We have searched supersymmetry (SUSY) using trilepton events in p bar p collisions at ?s = 1.8 TeV. In the Minimal Supersymmetric Standard Model (MSSM), trilepton events are expected from chargino-neutralino (?1±?2o) pair production, with subsequent decay into leptons. In all possible combinations of electron and muon channels in 19 pb-1data, we observe no events which pass our trilepton selection criteria. Assuming the GUT hypothesis within the framework of the MSSM, our preliminary analysis excludes M(?1±?2o) 2 for -500

1994-01-01

393