Initial Measurements with the PETsys TOFPET2 ASIC Evaluation Kit and a Characterization of the ASIC TDC

For a first characterization, we used the two KETEK-PM3325-WB SiPMs each equipped with a 3x3x5 mm${}^3$ LYSO scintillation crystal provided with the PETsys TOFPET2 ASIC Evaluation Kit. We changed the lower of two discriminator thresholds (D_T1) in the timing branch from vth_t1 = 5 - 30. The overvoltage was varied in a range of 1.25 V - 7.25 V. The ambient temperature was kept at 16{\deg}C. For all measurements, we performed an energy calibration including a correction for saturation. We evaluated the energy resolution, the coincidence resolving time (CRT) and the coincidence rate. At an overvoltage of 6 V, we obtained an energy resolution of about 10% FWHM, a CRT of approximately 210 ps FWHM and 400 ps FWTM, the coincidence rate showed only small variations of about 5%. To investigate the influence of the ambient temperature, it was varied between 12{\deg}C - 20{\deg}C. At 12{\deg}C and an overvoltage of 6.5 V, a CRT of approx. 195 ps FWHM and an energy resolution of about 9.5% FWHM could be measured. Observed satellite peaks in the time difference spectra were investigated in more detail. We could show that the location of the satellite peaks is correlated with a programmable delay element in the trigger circuit.Comment: This paper is under review with IEEE TRPMS. It has been presented in a talk at the PSMR 2018. This version of the manuscript was submitted as revision 2 to TRPMS after incrporating the comments of the reviewers. Only minor textchanges were made. Results, values and figures did not chang

Enablers and barriers in German online food retailing

This article discusses enablers and barriers in online food retailing in Germany. The German food retail sector is one of the largest in Europe; however, its online or Internet provision for customers lags way behind the United Kingdom and France. Prior research has considered the demand-consumer side of this dyad; however, little has been done on the online food supply-retail side. This article addresses that gap through exploratory empirical research with three retailers, three logistics service providers, and a marketing agency. There is good potential in this market but costs of fulfilment and service quality currently represent major barriers

A CONTINUATION OF ENVIRONMENTAL CONSERVATION POLICY: THE CONSERVATION RESERVE PROGRAM

Environmental Economics and Policy, Land Economics/Use,

THE ENVIRONMENTAL QUALITY INCENTIVES PROGRAM: LOCALLY MANAGING NATURAL RESOURCES

Environmental Economics and Policy, Resource /Energy Economics and Policy,

Institutionalizing alternative economic spaces? An interpretivist perspective on diverse economies

This article offers an approach that helps geographers and others to carefully and critically reexamine prospects for diverse economies. We propose an interpretative institutionalist perspective is useful for elucidating overlooked opportunities for creating alternative economic visions and practices by revealing the process of ‘meaning making’ undertaken by actors in the process of developing policy responses to various dilemmas. We explore this notion in the context of de-growth or post-growth. De-growth is a way of thinking about the economy in ways that are not growth oriented, or fixated on GDP, but on the redistribution of wealth and living within the Earth’s ecosystems

Changes in Ion Channel Expression Levels Following Axonal Injury in the Crustacean Stomatogastric Ganglion [abstract]

Abstract only availableFaculty Mentor: Dr. David Schulz, BiologyIon channels play an essential part in carrying the electrical impulses that control motor and sensory functions. The regulation of these channels is fundamental in establishing and maintaining appropriate neuronal output. Therefore, mechanisms may exist that alter the expression of these ion channels as a result of changes in neuronal activity. To explore this possibility, we hypothesized that a decrease in sodium channel activity would result in a lower level of expression of sodium channel mRNA. We tested this hypothesis by determining whether injury to axons causes a decrease in the abundance of sodium channel mRNA. We performed this experiment in motor neurons of the crab (Cancer borealis) stomatogastric ganglion (STG) by measuring sodium channel mRNA in control and in preparations where axons of STG neurons were cut. Using quantitative PCR, we determined that sodium channel mRNA levels were twofold higher in STG cells taken from the control preps as compared to injured preps. The data was inconsistent with our hypothesis that mRNA expression levels would decrease after an injury that lowers sodium channel activity. These results suggest a balance between ion channel abundance and neuronal activity may be dependant not only on the nerves themselves, but the environment they are contained in due to the variance in technique used between the first and second sets of preparations. Even though little "homeostatic plasticity" was exhibited, these results may shed light on changes in cellular properties that could influence therapeutic treatments when dealing with damage to the nervous system

Exploring success factors and constraints in German online food retailing

Paper presented at Rencontres Internationales de la Recherche en Supply Chain et Logistique (RIRL), Marseille, 20-21 May 2014. Abstract: This paper discusses success factors and constraints in online food retailing in Germany. While the German food retail sector is one of the largest in Europe, the sector’s online/Internet provision for customers lags way behind the UK and France. Prior research has considered the demand/consumer side of this dyad however little has been done on the supply/retail side. This paper addresses that gap through empirical research with three retailers, three logistics service providers and a marketing agency. There is good potential in this market but costs of fulfilment and service quality currently represent constraints