F. W. Wieland

TU Dresden

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Evidence for the positive-strangeness pentaquark Θ+ in photoproduction with the SAPHIR detector at ELSA

Physics Letters B (2003)

J. Barth Wolfgang Braun J. Ernst K.-H. Glander J. Hannappel

The positive-strangeness baryon resonance Θ+ is observed in photoproduction of the nK+K0s final state with the SAPHIR detector at the Bonn ELectron Stretcher Accelerator ELSA. It is seen as a peak in the nK+ invariant mass distribution with a 4.8σ confidence level. We find a mass MΘ+=1540±4±2 MeV and an upper limit of the width ΓΘ+<25 MeV at 90% c.l. The photoproduction cross section for K0Θ+ is in the order of 300 nb. From the absence of a signal in the pK+ invariant mass distribution in γp→pK+K− at the expected strength we conclude that the Θ+ must be isoscalar.

Pentaquark

Isoscalar

Invariant mass

10.1016/j.physletb.2003.08.019

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Citations (297)

A water-powered Energy Harvesting system with Bluetooth Low Energy interface

Journal of Physics Conference Series (2016)

Michael Kroener K. Allinger Mette M. Berger E. Grether F. W. Wieland

This paper reports the design, and testing of a water turbine generator system for typical flow rates in domestic applications, with an integrated power management and a Bluetooth low energy (BLE) based RF data transmission interface. It is based on a commercially available low cost hydro generator. The generator is built into a housing with optimized reduced fluidic resistance to enable operation with flow rates as low as 6 l/min. The power management combines rectification, buffering, defined start-up, and circuit protection. An MSP430FR5949 microcontroller is used for data acquisition and processing. The data are transmitted via RF, using a Bluegiga BLE112 module in advertisement mode, to a PC where the measured flow rate is stored and displayed. The transmission rate of the wireless sensor node (WSN) is set to 1 Hz if enough power is available, which is the case for flow rates above 5.5 l/min. The electronics power demand is calculated to be 340 μW in average, while the generator is capable of delivering more than 200 mW for flow rates above 15 l/min.

Interface (matter)

Energy management system

10.1088/1742-6596/773/1/012040

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Citations (5)

Renewable energy and lightings - logically or artificially?

F. W. Wieland Henry Gueldner O. Hild

Renewable energy and high energy efficiency are big challenges today and for the future in research and development. While more than 55 % of the whole generated electric energy is used in electrical drives, lighting systems are not negligible and need up to 20 % (according to the Department of Energy in the USA even 22 %) of power going into the grid. This amount can be reduced by more than 25 % by using new lighting technologies like LED or OLED Light sources [1]. Due to European regulations, inefficient incandescent lamps will be banned from the European market by the End of 2016. By now, solid state lighting is already one of the strongest growing application markets in the electronics sector. The Paper discusses the electric parameters and aging effects of OLEDs and new drive concepts for LED/OLED. Further insights of problems arising from large lifetimes (for example: LED 10 ⁵ hours [3] ) and their demands on driving circuits are discussed.

Incandescent light bulb

LED lamp

Electric light

10.1109/icrera.2012.6477351

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Citations (2)

Low-energy photoproduction of $\omega$ -mesons

The European Physical Journal A (2003)

J. Barth Wolfgang Braun J. Ernst K.-H. Glander J. Hannappel

Helicity

10.1140/epja/i2003-10061-y

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Citations (78)

Erratum to: Study of the reaction gammap --> K+Lambda(1520) at photon energies up to 2.65 GeV

F. W. Wieland J. Barth K.-H. Glander J. Hannappel N. Jöpen

Source

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Citations (0)

Photoproduction of η′-mesons with the 4π-detector SAPHIR

Physics Letters B (1998)

R. Plötzke J. Barth Wolfgang Braun R. Burgwinkel J. Ernst

Photon energy

Vector meson dominance

10.1016/s0370-2693(98)01444-0

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Citations (63)

Table 5 ; Measurement of the reaction $γ p \to K^ + Λ(1520)$ at photon energies up to 2.65 GeV

F. W. Wieland J. Barth K.-H. Glander J. Hannappel N. Jöpen

Table (database)

Source

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Citations (0)

First results on η′ photoproduction with SAPHIR

Nuclear Physics A (1998)

J. Ernst H. Jüngst H. Kalinowsky E. Klempt J. M. Link

10.1016/s0375-9474(98)00276-0

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Measurement of the reaction γp → K0Σat photon energies up to 2.6 GeV⋆

The European Physical Journal A (2005)

R. Lawall J. Barth C. Bennhold K.-H. Glander S. Goers

Isobar

Photon energy

10.1140/epja/i2005-10002-x

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Citations (92)

Strangeness photoproduction with the SAPHIR detector

J. Barth M. Bockhorst Wolfgang Braun R. Burgwinkel K.-H. Glander

Statistically improved data of total cross sections and of angular distributions for differential cross sections and hyperon recoil polarizations of the reactions γp→K+Λ and γp→K+Σ0 have been collected with the SAPHIR detector at photon energies between threshold and 2.0 GeV. Here total cross section data up to 1.5 GeV are presented. The opposite sign of Λ and Σ polarization and the change of sign between forward and backward direction could be confirmed by higher statistics. A steep threshold behaviour of the K+Λ total cross section is observed.

10.1063/1.54376

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Citations (0)