Triple resonant four-wavemixing boosts the yield of continuous coherent VUV generation

Continuous-wave coherent radiation in the vacuum ultraviolet (VUV)wavelength region at 121 nm will be essential for future laser-cooling of trapped antihydrogen [1]. Cold antihydrogen will enable both tests of the fundamental symmetry between matter and antimatter at unprecedented experimental precision [2] and also experiments in antimatter gravity [3]. Another fascinating application of narrowband continuous laser radiation in the VUV is quantum information processing using single trapped ions in Rydberg-states [4, 5]. Here we describe highly efficient continuous four-wave mixing in the VUV by using three different fundamental wavelengths with a sophisticated choice of detunings to resonances of the nonlinear medium. Up to 6 microwatts of vacuum ultraviolet radiation at 121 nm can be generated which corresponds to an increase of three orders of magnitude in efficiency.Comment: 11 pages, 3 figure

Location, location, location: Extracting location value from house prices

The price for a single-family house depends both on the characteristics of the building and on its location. We propose a novel semiparametric method to extract location values from house prices. After splitting house prices into building and land components, location values are estimated with adaptive weight smoothing. The adaptive estimator requires neither strong smoothness assumptions nor local symmetry. We apply the method to house transactions from Berlin, Germany. The estimated surface of location values is highly correlated with expert-based land values and location ratings. The semiparametric method can therefore be used for applications where no other location value information exists or where this information is not reliable

Location, location, location: Extracting location value from house prices

We propose a novel semiparametric method to extract location values from house prices. After splitting house prices into building and land components, location values are estimated with adaptive weight smoothing. The adaptive estimator requires neither strong smoothness assumptions nor local symmetry. We apply the method to house transactions from Berlin, Germany. The estimated surface of location values is highly correlated with expert-based land values and location ratings. The method can therefore be used for applications where no other location value information exists or where this information is not reliable

Real estate listings and their usefulness for hedonic regressions

Acknowledgements: We are grateful to the two anonymous referees and the associate editor for suggestions and comments that helped to improve the paper. We thank Robert Hill, Helmut L¨utkepohl, Bryan MacGregor, Aleksandar Petreski, Verity Watson, and audiences at University of Aberdeen Business School, KTH Royal Institute of Technology Stockholm, and AREUEA 2019 International Conference for helpful comments. The usual disclaimer applies. Kolbe and Werwatz thank the DFG Research Unit 2569: Agricultural Land Markets - Efficiency and Regulation for financial support. Funding: Open Access funding enabled and organized by Projekt DEAL.Peer reviewedPublisher PD

Identifying Berlin’s land value map using adaptive weights smoothing

Acknowledgments We have benefited from comments received at the Applicable Semiparametrics Conferencein Berlin 2013 and from two anonymous referees. Financial support from the Deutsche Forschungsgemeinschaft, CRC 649 Economic Risk, is gratefully acknowledged. The usual disclaimer appliesPeer reviewedPostprin

Handlungsgrundlage zur Bedarfsanerkennung von Düngemaßnahmen gemäß Anhang I und II der Verordnung (EWG) Nr. 2092/91 über den ökologischen Landbau

In den Erzeugervorschriften der Verordnung (EWG) Nr. 2092/91 sind lediglich Rahmenbedingungen festgelegt worden für die Bedarfsanerkennung von Düngungsmaßnahmen auf dem Öko-Betrieb. Als Ergebnis eines längeren Diskussionsprozesses wurde nachfolgende Handlungsgrundlage für Landwirte und Kontrollstellen des Ökologischen Landbaus zur Bedarfsanerkennung von Düngungsmaßnahmen gemäß Anhang I und II der Verordnung erstellt. In den Handlungsvorgaben und einem Leitfaden werden die fachlichen Grundlagen aufgeführt, so dass eine Entscheidungsfindung zur Bedarfsanerkennung von Düngungsmaßnahmen erleichtert wird

Continuous-wave spontaneous lasing in mercury pumped by resonant two-photon absorption

The first continuous-wave two-photon absorption laser-induced stimulated emission (CTALISE) is demonstrated. The 7^1S-6^1P transition in mercury at 1014nm wavelength is used and selective lasing of different isotopes is observed.Comment: 3 pages, 5 figure

Prevalence of polyneuropathy in patients with Parkinson`s disease in Germany

Background: The prevalence of the peripheral neuropathy (PN) is of 4.2 – 8% in those over 65 y.o. In patients with the Parkinson’s disease (PD) a PN – prevalence of 34.2 – 55% was reported. Low vitamin B12-blood level was present in 13% of PD patients. There is a higher prevalence of PN in levodopa-treated patients (36.1%) than in naive (12.1%) and in healthy controls (8.1%). Material and methods: We examined 601 patients with PD. Of them, 407 patients underwent electrophysiological examination. Results: 444 (73.9%) had clinically PN. Of 407 patients who underwent electrophysiological investigations, in 361 (88.7%) PN was confirmed. The most common was axonal (304 patients; 84.2%), sensory (282; 78.1%), and slight (78; 21.6%) or moderate (164; 45.4%) PN. Of 471 patients receiving levodopa, 369 (78.3%) had clinical PN, compared to 75 (56.8%) of 132 levodopa-naive patients (p<0.01). At the T1 – time – point of first – diagnosis of polyneuropathy, 179 patients (40.3%) of 444 with PN had a vitamin B12-deficiency. In 585 of patients, 38 (33.3%) of 114 levodopa-naive PD patients had vitamin B12-deficiency at the T1, compared to 129 (27. 1%) of 471 levodopa-treated PD patients (p=0.2). Conclusions: Peripheral polyneuropathy is very common in PD. In our group of PD patients the prevalence of a clinical polyneuropathic syndrome was very high and in almost 90% of cases it was confirmed electrophysiologically. 40% of patients with PN had a vitamin B12 deficiency. Levodopa-treatment was more common in PD patients with PN than in those without

Influence of the 6^1S_0-6^3P_1 Resonance on Continuous Lyman-alpha Generation in Mercury

Continuous coherent radiation in the vacuum-ultraviolet at 122 nm (Lyman-alpha) can be generated using sum-frequency mixing of three fundamental laser beams in mercury vapour. One of the fundamental beams is at 254 nm wavelength, which is close to the 6^1S_0-6^3P_1 resonance in mercury. Experiments have been performed to investigate the effect of this one-photon resonance on phasematching, absorption and the nonlinear yield. The efficiency of continuous Lyman-alpha generation has been improved by a factor of 4.5.Comment: 8 pages, 7 figure