NGRIP CH4 concentration from 120 to 10 kyr before present and its relation to a δ15N temperature reconstruction from the same ice core

During the last glacial cycle, Greenland temperature showed many rapid temperature variations, the so-called Dansgaard–Oeschger (DO) events. The past atmospheric methane concentration closely followed these temperature variations, which implies that the warmings recorded in Greenland were probably hemispheric in extent. Here we substantially extend and complete the North Greenland Ice Core Project (NGRIP) methane record from the Preboreal Holocene (PB) back to the end of the last interglacial period with a mean time resolution of 54 yr. We relate the amplitudes of the methane increases associated with DO events to the amplitudes of the local Greenland NGRIP temperature increases derived from stable nitrogen isotope (δ15N) measurements, which have been performed along the same ice core (Kindler et al., 2014). We find the ratio to oscillate between 5 parts per billion (ppb) per °C and 18 ppb °C−1 with the approximate frequency of the precessional cycle. A remarkably high ratio of 25.5 ppb °C−1 is reached during the transition from the Younger Dryas (YD) to the PB. Analysis of the timing of the fast methane and temperature increases reveals significant lags of the methane increases relative to NGRIP temperature for DO events 5, 9, 10, 11, 13, 15, 19, and 20. These events generally have small methane increase rates and we hypothesize that the lag is caused by pronounced northward displacement of the source regions from stadial to interstadial. We further show that the relative interpolar concentration difference (rIPD) of methane is about 4.5% for the stadials between DO events 18 and 20, which is in the same order as in the stadials before and after DO event 2 around the Last Glacial Maximum. The rIPD of methane remains relatively stable throughout the full last glacial, with a tendency for elevated values during interstadial compared to stadial periods.

A Passive Source Localization System for IEEE 802.15.4 Signal

In this work, we provide a passive location monitoring system for IEEE 802.15.4 signal emitters. The system adopts software defined radio techniques to passively overhear IEEE 802.15.4 packets and to extract power information from baseband signals. In our system, we provide a new model based on the nonlinear regression for ranging. After obtaining distance information, a Weighted Centroid (WC) algorithm is adopted to locate users. In WC, each weight is inversely proportional to the nth power of propagation distance, and the degree n is obtained from some initial measurements. We evaluate our system in a 16m-18m area with complex indoor propagation conditions. We are able to achieve a median error of 2:1m with only 4 anchor nodes.

Shulamit oder Bat-Yerushalayim : eine muziḳalishe melodrama in raimen un in 4 aḳṭen un 15 bilder

ferfasṭ fon Avraham Goldfaden

Bekanntmachung: Die Wahl-Bezirke Nr. 1., 3., 4., 12. bis 15. ...

Welsch (Projektbearbeiter): Festlegung des Umfangs des fünften engeren Wahldistrikts zum preußischen Landtag sowie des engeren Wahldistrikts zur deutschen Nationalversammlung; Vorladung der Wahlmänner zur Vorberatung über die Kandidatenwahl

[Haggada. 15. Jahrhundert] Bl. 4 a oben [Illustration] : Sitzender Mann, die linke Hand erhebend

Scan von Monochrom-Mikroform

Missalonghis Untergang : Predigt über Röm. XII. v. 15. Ende ; gehalten Sonntags den 4. Juni 1826

von Conrad von Orell

Zur Feier der 4 Tage im März 1848! : 12. 13. 14. 15 ; der heldenmüthigen Studirenden-Legion an der Wiener Hochschule geweiht

Welsch (Projektbearbeiter): Feierliches Gedicht zu Ehren der in der Nacht vom 13. auf den 14. März 1848 gegründeten Wiener Akademischen Legion. Vom Schriftsteller und Arzt Siegfried Kapper; vertont von dem Komponisten Henry Litolff

Na 1 Nachlass Max Horkheimer, 611 - Vorlesung: "Geschichte der neueren Philosophie" 4 (p. VIII 7, 2a.15 - VIII 7, 2a.19)

Vorlesungsskript, Typoskript mit eigenhändigen Korrekturen (GS 9, S.11-480);