The recent trend towards more programmable switching hardware in data centers opens up new possibilities for distributed applications to leverage in-network computing (INC). Literature so far has largely focused on individual application scenarios of INC, leaving aside the problem of coordinating usage of potentially scarce and heterogeneous switch resources among multiple INC scenarios, applications, and users. The traditional model of resource pools of isolated compute containers does not fit an INC-enabled data center. This paper describes HIRE, a Holistic INC-aware Resource managEr which allows for server-local and INC resources to be coordinated in a unified manner. HIRE introduces a novel flexible resource (meta-)model to address heterogeneity, resource interchangeability, and non-linear resource requirements, and integrates dependencies between resources and locations in a unified cost model, cast as a min-cost max-flow problem. In absence of prior work, we compare HIRE against variants of state-of-the-art schedulers retrofitted to handle INC requests. Experiments with a workload trace of a 4000 machine cluster show that HIRE makes better use of INC resources by serving 8-30% more INC requests, while at the same time reducing network detours by 20%, and reducing tail placement latency by 50%.

Autonomous service robots have great potential to support humans in tasks they cannot perform due to, amongst others, time constraints, work overload, or staff shortages. An important step for such service robots to be trusted or accepted by society is the provision of transparency. Its purpose is not only to communicate what a robot is doing according to the human interaction partners' needs, it should also regard social and legal requirements. A black box recorder (inspired by flight recorders) increases the system's transparency by facilitating the investigation of the cause of an incident, clarifying responsibilities, or improving the user's understanding about the robot. In this work we propose the needed requirements of such a black box recorder for increased transparency of autonomous service robots, based on the related work. Further, we present a new modular and portable black box recorder design meeting these requirements. The applicability of the system is evaluated based on real-world robot data, using the realized open-source reference implementation.

Zweiatomiger Schwefel, S2, wird bei der thermischen Zersetzung der Titelverbindung 1 neben dem Fünfring 2 gebildet. Dieser Dischwefel kann an Diene addiert werden. Beispielsweise reagiert er mit 2,3‐Dimethyl‐1,3‐butadien zu einem 1,2‐Dithiacyclohexen.magnified image

AbstractThe trimethylsilyl selenides (III) and (VII) are prepared either from the aryl Grignard compounds (I) by reaction with Se and chlorotrimethylsilane or from the sodium selenide (V) and the primary halides (VI).

Phenyl-trimethyl-selenide and 2,4,6-trimethylphenyl-selenide have been synthesized and characterized from the organobromide, magnesium, selenium and trimethylchlorosilane. A better method has been found for the synthesis of organyl-trimethylsilyl-selenides. It starts from sodium-trimethylsilylselanolate, the synthesis of which is described. Its reactions with methylbromide, benzylbromide and n-pentylbromide result in the formation of the compounds R-Se-Si(CH3)3 with the corresponding groups R. Secundary as well as tertiary bromides do not react in the expected manner. Phenyl-trimethyl-selenid und 2,4,6-Trimethylphenyl-selenid werden aus dem Organylbromid, Magnesium, Selen und Trimethylchlorsilan hergestellt und charakterisiert. Eine bessere Methode zur Synthese von Organyl-trimethylsilyl-seleniden geht von Natrium-trimethylsilylselanolat aus, dessen Darstellung be-schrieben wird. Seine Umsetzungen mit Methyliodid, Benzylbromid und n-Pentylbromid liefern die Verbindungen R-Se-Si(CH3)3 mit den entsprechenden Resten R. SekundÅe und tertiÅe Bromide reagieren nicht in der gewünschten Weise.

The coordinative behaviour of the “weak bases” trimeric, tetrameric, and pentameric thioformaldehyde as well as trimeric thioacetaldehyde is studied towards the “hard acid” titaniumtetrachloride. The adducts (CH2S)3 · TiCl4, 1, (CH2S)4 · TiCl4, 2, (CH2S)5 · TiCl4, 3, 2(CH2S)3 · TiCl4, 4, 2(CH2S)4 · TiCl4, 5, 2(CH2S)2 · TiCl4, 6, and (CH3CHS)3 · TiCl4, 7, have been synthesized. Das Komplexbildungsvermögen der “weichen Basen” trimerer, tetramerer und pentamerer Thioformaldehyd sowie trimerer Thioazetaldehyd gegenüber der “harten Säure” Titantetrachlorid wird untersucht. Die Addukte (CH2S)3 · TiCl4, 1, (CH2S)4 · TiCl4, 2, (CH2S)5 · TiCl4, 3, 2(CH2S)3 · TiCl4, 4, 2(CH2S)4 · TiCl4, 5, 2(CH2S)5TiCl4, 6, und (CH3CHS)3 · TiCl4, 7, werden beschrieben.

Abstract The first examples of the hitherto unknown 1,2,4-Trithia-3,5-diborolanes with B-O-C-bonds have been synthesized and characterised. The diiodo substituted ring (2) reacts with 2,6-dimethylphenol, to form 3,5-bis-(2,6-dimethylphenyloxi)-1,2,4-trithia-3,5-di-borolane (3) and HI. 3,5-Diethoxi-1,2,4-trithia-3,5-diborolane, 5, and C2H5I are formed via the cleavage of diethylether by 2. From 2 and diisopropylether, the corresponding 3,5-diisopropyloxi-1,2,4-trithia-3,5-diborolane (6) is formed. The unsymmetrical ethers methyl-t-butylether and methylphenylether undergo reactions with 2 resulting in the formation of 3,5-dimethyloxi-1,2,4-trithia-3,5-diborolane (8) (besides t-C4H9I) and 3,5-diphenyloxi-1,2,4-trithia-3,5-diborolane (10) (besides CH3I). The thermal stability of the new compounds is increasing with increasing size of R in the -OR group and from aliphatic to aromatic R in this group. IR, Raman, 1H NMR and 11B NMR spectra of the compounds are reported as well as some physical and chemical properties.

Abstract1,1′‐Dimercaptodimethylselenid und 1,1′‐Di(hydroseleno)dimethylselenid werden aus 1,1′‐Dibromdimethylselenid über Poly(dithiomethyl)selenid bzw. Poly(diselenomethyl)selenid und deren Spaltung mit Natrium in flüssigem Ammoniak dargestellt. IR‐ und 1H‐NMR‐Spektren werden angegeben.

AbstractPhosphan‐komplexiete d8‐Metallchloride (7, 8 und 9) reagieren mit bifunktionellen Mercaptanen (1 und 2) und Selenomercaptanen (3 und 4) in Benzol unter Bildung luftstabiler phosphan‐komplexierter Sechsringe (10–21). IR‐, Raman‐ und 1H‐NRM‐Daten sowie physikalische und chemische Eigenschaften der neuen Komplexe werden mitgeteilt. Bis (selenylmethyl)sulfid (4) wird erstmals beschrieben.

Abstract A short literature survey on phosphine-coordinated d8-metal tetrasulfides is given. Different results have been reported for the reactions of elemental sulfur with Pt(PPh3)4 (1). The reaction of sodium polysulfides, Na2Sx, with the corresponding dihalides results in a clear-cut manner in the formation of the already known compounds tetrasulfidoethylenebis(diphenylphosphine)palladium(II) (6) and tetrasulfido-bis(triphenylphosphine)-platinum(II) (5), and the new compound tetrasulfido-ethylenebis(diphenylphosphine)-nickel(II) (13). Degradation reactions of [Pt(S5)3]2-(9) with triphenylphosphine, tri-p-tolylphosphine and ethylene-bis(diphenylphospbine) result in the formation of 5, and tetrasulfido-ethylenebis(diphenylphosphine)platinum(II) (4) and the new tetrasulfidobis( tri-p-tolylphosphine)platinum(II) (10). IR-spectra are reported.

Die Spaltung von s-Trithian, Trithioacetaldehyd, (CH2S) n und (CH2S2) n mit Natrium in flüssigem Ammoniak liefert Mercaptothioether und Bis-Mercaptothioether nach einem allgemien anwendbaren Reaktionsprinzip. Beschrieben wird die Synthese von 2.4-Dithiapentan-1-thiol (1), 2-Thiapropan-1-thiol (2), 2-Mercapto-3-thiapentan (4) und Bis-mercaptodimethylsulfid (6). The cleavage of s-trithiane, trithio acetic aldehyde, (CH2S) n and (CH2S2) n by sodium in liquid ammonia leads to the formation of mercapto thioethers and bis-mercapto thioethers according to a general reaction principle. Described is the synthesis of 2.4-dithiapentane-1-thiole (1), 2-thiapropane-1-thiole (2), 2-mercapto-3-thiapentane (4) and bis-mercapto dimethyl sulfide (6).

Abstracts‐Trithian, monosubstituierte s‐Trithiane und s‐Tetrathiocane, Cyclooctaschwefel und in begrenztem Maße auch Selen können zusammen mit Tetrathiocan polymerisiert werden, wenn die geschmolzenen Gemische mit einer Spur Bortrifluoridetherat behandelt werden. Es entstehen dabei meist unzersetzt schmelzende Polymethylensulfide, substituierte Polymethylensulfide, Polymethylenpolysulfide und Polymethylensulfidselenide.