bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Molecular Structure of Allenes and Ketenes, XI Semiempirical Calculations of 1H-Chemical Shifts of Allenes
Authors: Runge W. 
Published: March 2015

A comparison between calculated and observed values demonstrates that “ansätze” derived from an algebraic model in connection with appropriate boundary conditions are able to account for a quantitative description of the proton chemical shifts of allenes.
Correlations of the proton chemical shifts with other NMR data, such as 13C-chemical shifts and one-bond carbon-proton coupling constants, reveal some insigths into the nature of the 1H substituent chemical shifts of alienes.
Darstellung und Struktur des KAu4Sn2 / Preparation and Crystal Structure of KAu4Sn2
Authors: Sinnen Heinz-Dieter , Schuster Hans-Uwe 
Published: March 2015

Abstract
In the course of our investigation of the ternary system K-Au-Sn we obtained the new compound KAu4Sn2. Its crystal structure has been determinated from single crystal X-ray diffraction data. It crystallizes in the tetragonal space group 1̅4̅c2 with unit-cell parameters a = 884.7 and c = 817.8 pm and Z = 4. The structure is comparable to that of the Tl2Se.
Bis[-µ-methyl-1.3-dimethyl-h3 -allyl-nickel] Struktur und Bindungsverhältnisse eines Alkyl-verbrückten Ni-Ni-Systems / Bis [-µ-methyl-1,3-dimethyl-h3 -allyl-nickel] The Bonding in an Alkyl-Bridged Ni-Ni System
Authors: Krüger Carl , Sekutowski Janine , Berke Heinz , Hoffmann Roald 
Published: March 2015

Abstract
The crystal structure of the diamagnetic title compound (1), a = 9.9594(9), b = 9.3895(7), c = 14.8434(8), β = 95.112(5) is described. Two co-ordinatively square planar nickel atoms each carrying a h3-C5H9 group are linked together by two methyl bridges, with the h3-C5H9 groups lying cisoid about the two nickel atoms. The molecule is folded about its centre so that the Ni-Ni distance is only 2.371, indicating a strong interaction within the unsaturated metal system. The bridging methyl groups form novel, slightly unsymmetrical two electron - three centre bonding systems. The electronic structure of 1 is analysed by MO methods. The nature of the nickel-nickel interaction as well as the stabilising factors of these unsaturated systems are explained. A discussion centred about one low energy LUMO leads
The Delayed Fluorescence of Indole in Alcohol-Alkane Mixed Glasses at 77 K
Authors: Yamashita Shozi , Tomita Giiti 
Published: March 2015

Abstract
Using a phosphoroscope and a pulsed light-signal integrator, the effect of alcohol on the delayed fluorescence of indole was investigated in alcohol-isopentane mixed glasses at 77 K. The delayed fluorescence intensity was strongly depended on the alcohol concen-tration and the polarity of alcohol. Trapped electrons causing the delayed fluorescence were separated into two species utilizing the scavenge effect of CCl4; shallow trapped-electrons sensitive to CCl4 and deep trapped-electrons insensitive to CCl4. The former electrons seem to be responsible for the delayed fluorescence at low alcohol concentrations, whereas the latter for the delayed fluorescence at higher alcohol concentrations. The delayed fluorescence decayed exponentially at low alcohol concentrations, but it decayed with the Debye-Edwards law of t-1 at higher alcohol concentrations. The recombination mechanism of trapped electrons with parent cations was discussed. The structure of shallow traps was also estimated.
Notizen: Eine einfache Synthese von Tetrahydroxybenzochinon-1.4 / A Simple Synthesis of Tetrahydroxy-benzoquinone- 1,4
Authors: Junek Hans , Unter Bernd , Peltzmann Regina 
Published: March 2015

Abstract
Tetrahydroxy-benzoquinone-1.4, Tetraalkoxy-benzoquinones-1.4 Hydrolysis of easy available tetramethoxy-benzoquinone-1,4 leads to tetrahydroxy-benzo-quinone-1,4 in good yield. Tetramethoxy-benzo-quinone is obtained by a modified method from tetrachlorobenzoquinone. It is subsequently used for the synthesis of higher alkoxy-benzo-quinones-1,4.
Neues über ternäre Interalkalimetalloxide und Alkalithallium(I)-oxide / News About Ternary Inter Alkaline Metal Oxides and Alkalinethallium(I)oxides
Authors: Sabrowsky Horst , Mertens Petra , Dönhoff Fritz Otto 
Published: March 2015

Besides KNaO and RbNaO, KLiO is the third example of hitherto unknown and unexpected in- teralkaline metal oxides. The X-ray investigation of the orthorhombic KLiO (Z=8) shows a new structure with separated layers of [xxx] anions in which every lithium atom is co-ordinated by a triangle of three oxygens.
The compounds KTlO, RbTlO and CsTlO are already known. Now serveral new ternary alkaline oxides with monovalent thallium have been obtained. In the Na2O-Tl2O system the red compounds NaTlO and Na3TlO2 were found. Further- more KTl3O2, RbTl3O2 and CsTl3O2 have been prepared. Their unit cells (Z=3) correlate to the unit cell of hexagonal Tl2O (Z=6)
Synthese neuer Phosphan-Nickel(I)-KompIexe und Kristallstruktur von μ3–Iodo-tris-μ-iodo-cyclotris(triphenylphosphan-nickel), (TPP)3Ni3I4 / Synthesis of New Phosphine Nickel(I) Complexes and Crystal Structure of μ3-Iodo-tris-μ-iodo-cyclotris(triphenylphosphine Nickel), (TPP)3Ni3I4
Authors: Hoberg Heinz , Radine Klaus , Krüger Carl , Romão Maria J. 
Published: March 2015

Abstract
Synthesis and properties of the new nickel(I) complexes (COD)Ni(TPP)I (3) and (TCP)Nil (5) are reported. Reaction of 3 and 5 with diphenylacetylene (7) yields alkyne complexes (R3P)NiI(PhC2Ph)Ni(R3P)I (R = Ph (8a), and Cy (8b)). In solution, 3 disproportionates to give nickel(O) and (TPP)3Ni3I4 (12)), the structure of which has been determined by X-ray crystallography. Cluster compound 12 is cleaved into monomeric units by addition of ligands such as TPP or CO (TPP = triphenylphosphine, TCP = tricyclohexylphosphine, COD = 1,5-cyclooctadiene).
Trimethoxyphenylverbindungen, X [1]. Inhaltsstoffe von Hagenia abyssinica, 1: Isolierung von Kosinen und Strukturaufklärung einkerniger Phloracylophenone [2] / Trimethoxyphenyl Compounds, X [1]. Constituents of Hagenia abyssinica, 1: Isolation of Kosins and Structure Elucidation of Phloracylophenones Containing One Phloroglucinol Unit [2]
Authors: Schiemenz Günter Paulus , Schröder Jens-Michael 
Published: March 2015

Abstract
From Hagenia abyssinica, 26 compounds were isolated, mostly phloracylophenones with one to three phloroglucinol units. The structure elucidation of three phloracylophenones with one phloroglucinol unit is described.
Trimethoxyphenylverbindungen, XI [1]. Inhaltsstoffe von Hagenia abyssinica, 2: Synthese einkerniger Phloracylophenone / Trimethoxyphenyl Compounds, XI [1]. Constituents of Hagenia abyssinica, 2: Synthesis of Phloracylophenones Containing One Phloroglucinol Unit
Authors: Schiemenz Günter Paulus , Behrens Heinz , Ebert Claus Peter , Maienschein Konrad , Schröder Jens-Michael 
Published: March 2015

Abstract
For the Koso constituents K6 and K8, we previously proposed the structures 1a, b and 2a, b [1]. These assignments have been confirmed by synthesis.
Monogagaine, a Novel Dimeric Indole Alkaloid from Tabernaemontana chippii and Tabernaemontana dichotoma [1]
Authors: Beek Teris A. van , Lankhorst Peter P. , Verpoorte Robert , Massiot Georges , Fokkens Roel , Erkelens Cornelis , Perera Premila , Tibell Cecilia 
Published: March 2015

Abstract
From the rootbark of Tabernaemontana chippii and the stembark of T. dichotoma a novel dimeric indole alkaloid was isolated which was named monogagaine. It was assigned structure 1 on the basis of spectral data. It showed antimicrobial activity against Bacillus subtilis.
Neue ternäre Alkaliphosphide mit Kupfer, Zink und Cadmium: K2CuP, NaZnP und K4CdP2 / On New Ternary Alkali Metal Phosphides: K2CuP, NaZnP and K4CdP2
Authors: Eisenmann Brigitte , Somer Mehmet 
Published: March 2015

The new compounds K2CuP, NaZnP and K4CdP2 have been prepared and structurally charac­terized. The crystallographic data are:
K2CuP: orthorhombic, space group Cmcm (No. 63). Na2CuAs structure type with a = 983.9(5) pm. b = 739.7(4) pm, c = 579.5(3) pm. There are CuP2- zigzag chains, which are isosteric to the chains in HgO.
NaZnP: tetragonal, space group P4/nmm (No. 129). PbFCl structure type with a = 406.6(2) pm. c = 689.3(3) pm, c/a = 1.695.
K4CdP2: monoclinic, space group C2/m (No. 12). New structure type with a = 984.0(5) pm, b = 568.1(3) pm. c = 957.5(5) pm. β = 110.0(1)°. There are discrete [P−Cu−P]4- anions, which are isosteric to the HgCl2 molecules.
Cyclothiazeno-oxo-diazidowoIframat(VI) Die Kristallstruktur von (AsPh4)2[W(N3S2)(O)(N3)2]2 / Cyclothiazeno Oxodiazidotungstate(VI) The Crystal Structure of (AsPh4)2[W(N3S2)(O)(N3)2]2
Authors: Wadle Heribert , Conradi Elke , Müller Ulrich , Dehnicke Kurt 
Published: March 2015

Abstract
A new, improved method of synthesis for the cyclothiazeno complex AsPh4[WCl4(N3S2)] consists of the reaction of Na2WO4 with molten trithiazyl chloride (NSCl)3 followed by treatment with AsPh4Cl in CH2C12. Through the reaction with silver azide suspended in CH2C12 in the presence of moisture, black crystalline (AsPh4)2[W(N3S2)(O)(N3)2]2 is obtained. Its IR spectrum and its crystal structure are reported. Crystal data: triclinic, space group P1̄, Z = 1, a - 1018.3, b = 1107.8, c = 1379.1 pm; a = 91.11°, β = 106.74°, γ = 113.91°. Structure determination with 3219 observed reflexions, R = 0.061. The structure consists of AsPh4
+ cations arranged to form (AsPh4
+)2 pairs and of dimeric anions [W(N3S2)(O)(N3)2]2⊖ in which the tungsten atom s are members of planar cyclothiazeno rings WN3S2 with WN bond lengths of 186 and 222 pm. The oxygen atoms are in positions trans to the longer of these bonds. One of the N atoms of each cyclothiazeno ring is involved in the dimerization resulting in a centrosymmetric W2N2 ring. The azido groups are situated above and below the ring system and complete the coordination number of six for the W atoms with WN distances of 208 and 212 pm
Radical Cation Salts of an Unsymmetrical BEDT-TTF Derivative: Molecular Structure and Physical Properties of (DIMET*)2CIO4 X THF
Authors: Heid R. , Endres H. , Keller H. J. 
Published: March 2015

Abstract
4.5-Dimethyl-4'.5'-ethylenedithiolotetrathiafulvalene (DIMET) was obtained by reacting 4.5- ethylenedithiolo-1.3-dithioliumtetrafluoroborate with 4.5-dimethyl- 1.3-dithiolium-tetrafluoroborate in the presence of diisopropylethylamine or triethylamine. Electrocrystallization of this donor in different solvents like dichloromethane or tetrahydrofurane (THF) and with varying supporting electrolytes, like tetrabutylammonium hexafluorophosphate, triiodide, nitrate, perrhenate or perchlorate, results in a large number of well crystallizing compounds. The crystal and molecular structure of one of the isolated solids was elucidated by X-ray methods.
(C10)H10S6)2CIO4 x C4H8O, Mr = 816.66, is triclinic, P1̄ , a = 6.731(5), b - 7.632(3), c = 33.32(3) Å , α = 96.53(5), β = 92.99(6), γ = 103.13(5)°, V - 1650.7 Å3, Z = 2, dc = 1.64 gem-3, final Rw = 0.077 for 1844 observed independent reflections. Sheets of cations with an average charge of 1/2+ are separated by sheets of anions and THF solvent molecules. Intermolecular S···S contacts result in two-dimensional physical properties. Electrical conductivity and thermopower measurements indicate two broad phase transitions at around 200 K and 80 K
Neuartige Cerebroside aus Cystobacter fuscus (Myxobacterales) [1] / Novel Cerebrosides from Cystobacter fuscus (Myxobacterales) [1]
Authors: Dill D. , Eckau H. , Budzikiewicz H. 
Published: March 2015

Abstract
From the cell material of Cystobacter fuscus (Myxobacterales) the cerebroside 1-O-β-D-galactopyranosyl- N-(2R-hydroxy-15-methylpalmitoyl)-17-methylsphinga-4E,8E-dienin (main component) and three related compounds could be isolated, the structure elucidation of which is being reported here
Gestational Age and Developmental Risk in Moderately and Late Preterm and Early Term Infants
Authors: Schonhaut Luisa , Armijo Iván , Pérez Marcela 
Published: March 2015

OBJECTIVES:
The objective of this study was to evaluate the association between gestational age (GA) at birth and risk of developmental delay at 8 and 18 months of corrected postnatal age.

METHODS:
During 2008 to 2011, infants at a corrected postnatal age of 8 or 18 months attending health centers in Santiago, Chile, were recruited. Participants completed a form on biographical and demographic characteristics and the Chilean validated version of the Ages and Stages Questionnaires, Third Edition (ASQ). Logistic regression was used to detect the capacity of GA to predict scores &lt; −2 SDs on the basis of the Chilean ASQ reference group, in at least 1 ASQ domain, adjusted by different control variables.

RESULTS:
A total of 1667 infants were included in the analysis. An inverse “dose response” relationship between developmental delay risk and GA at birth was found, both in the crude and adjusted models. Compared with those born full term, the odds ratio for developmental delay risk was 1.56 for those born early term (95% confidence interval [CI]: 1.19–2.06), 2.58 for infants born late preterm (95%CI: 1.66–4.01), and 3.01 for those born moderately preterm (95%CI: 1.59–5.71).

CONCLUSIONS:
An inverse dose-response relationship between GA and risk of developmental delay was found in the tested population. Future prospective studies and predictive models are needed to understand whether this higher developmental risk in moderately and late preterm infants is transient and modifiable or persists throughout life, allowing for better targeting of early-intervention strategies.
Engineered 2D Materials for Efficient Biosensors
Authors: Narayanan Tharangattu Narayanan , Ajayan Pulickel Madhavapanicker , Viswanathan Sowmya , Manickam Gurusaran , Renugopalakrishnan Venkatesan 
Published: March 2015

ABSTRACTThe emergence of 2-dimensional (2D) materials could herald numerous advanced scientific methodologies for both fundamental and applied research. These ultrathin materials can be functionalized and, thus, have the potential to make new devices and sensors that are both highly efficient and sensitive. In addition to being mechanically robust, the 2D materials can be engineered to provide sensor architectures that further increase their inherent high surface area by creating 3D geometries using layer by layer assembly to make stacked devices that could potentially be transparent. The increased sensor surface area would deliver increased signal-to-noise and sensitivity. Here highly sensitive and selective electrochemical detection of bio-analytes using some of engineered 2D materials such as graphene nano-ribbons, fluorinated graphene, and molybdenum disulfide is presented. It is found that surface moieties, defects and surface charges in these ultra-thin layers result in enhanced electron transfer kinetics between the electrodes and biomolecules. This in turn results in an oxidation or reduction of biomolecules with a high peak current, indicating the possible uses of 2D materials for various point-of-care devices. A novel stable 3D electrode geometry has been found to have enhanced heterogeneous electron transfer properties compared to 2D electrodes and provides evidence that electrode geometry and surface area could significantly impact the performance of biosensors.
Multiphase Flowmeter for Testing Heavy-Oil Wells in Offshore Brazil
Authors: Maizeret P.-D.. -D. , Rocha P.S.. S. , Danemberg Marsili M.. , de Almeida Ferreira I.. , Lipovetsky T.. , Schubert Junior E.. , Theuveny B.. 
Published: March 2015

Summary
In the heavy-oil Atlanta field, well-test operations were planned initially with a multienergy gamma ray/Venturi multiphase flowmeter as a contingency. During the well-test operations, the foaming propensity of the produced oil made it almost impossible to distinguish an interface between liquid and gas in the separator or tank, rendering the standard equipment useless. Only in the second test were some tank measurements available. The measurement principle used in this multiphase flowmeter, however, is not sensitive to foam or emulsion because the meter responds to the atomic-level composition of the different components of the mixture independently of their arrangement, providing accurate flow-rate measurements. Therefore, it became the main flowmetering device for the operator.
We detail the behavior of the multiphase flowmeter during the well tests in the Atlanta field and the challenges caused by this highly viscous oil. In the case of standard oils, the measurements are not sensitive to the viscosity value. However, in the case of low Reynolds numbers, the viscosity value can dramatically affect the results. In this case, some solvents were injected during the well test to reduce the liquid viscosity, and we present the consequences for the multiphase flowmeter. Because it was not possible to measure the viscosity directly at the wellsite, we highlight the work flow that was followed to determine the proper viscosity value to use. The viscosity number was validated by comparing the multiphase-flowmeter measurements to the gas/oil ratio measured in the laboratory on downhole samples from the same reservoir, to the water cut measured manually during the operations and to the tank total-liquid-rate measurements. Finally, we present some recommendations on the use of multiphase flowmeters for heavy-oil well tests.
Diversion Conditions for Viscoelastic-Surfactant-Based Self-Diversion Acid in Carbonate Acidizing
Authors: Mou Jianye , Liu Ming , Zheng Kexiang , Zhang Shicheng 
Published: March 2015

Summary
The success of matrix acidizing in carbonates is often dependent on the efficiency of diversion agents, especially for treatments on wells with thick formations or multiple zones, or horizontal wells with long and heterogeneous intervals. Viscoelastic-surfactant (VES) -based self-diversion acid has been used successfully in fields because of its negligible damage to the formation and good diversion ability. Although the diversion ability of VES acid was studied experimentally with small core plugs, the diversion conditions of VES acid under in-situ radial conditions need to be studied. In this paper, we develop a VES radial-acidizing model that simulates VES acid flow, acid/rock reaction, porosity variation, viscosifying, wormholing, and acid diversion in multiple zones. On the basis of the model, extensive numerical simulations are conducted to investigate wormholing behavior of the VES acid, the factors that affect the diversion ability of VES acid, and the diversion conditions of VES acid. The study shows that the VES acid-dissolution patterns depend on the injection rate, and there is an optimum injection rate under which the dominant wormholes are formed. Compared with regular acid, the VES acid provides better acid placement for heterogeneous intervals. The intervals with separation shorter than approximately 150 m can be acidized together with VES acid if the two intervals have a close permeability with no perforation between them. The permeability ratio of the two intervals has remarkable influence on the diversion performance of VES acid. Even though the viscosified fluid acts as a temporary barrier to prevent the fluid from flowing into the higher-permeability formation, the VES acid reduces diversion effectiveness for large permeability contrast. We also investigated the combined effect of permeability contrast and separation of the two intervals on diversion performance. This study provides a basis to select diversion technology and a method to evaluate diversion performance of VES acid for field-acidizing treatments.
Sea-ice surface roughness estimates from airborne laser scanner and laser altimeter observations in Fram Strait and north of Svalbard
Authors: Beckers Justin F. , Renner Angelika H.H. , Spreen Gunnar , Gerland Sebastian , Haas Christian 
Published: March 2015

AbstractWe present sea-ice surface roughness estimates, i.e. the standard deviation of relative surface elevation, in the Arctic regions of Fram Strait and the Nansen Basin north of Svalbard acquired by an airborne laser scanner and a single-beam laser altimeter in 2010. We compare the scanner to the altimeter and compare the differences between the two survey regions. We estimate and correct sensor roll from the scanner data using the hyperbolic response of the scanner over a flat surface. Measurement surveys had to be longer than 5 km north of Svalbard and longer than 15 km in Fram Strait before the statistical distribution in surface roughness from the scanner and altimeter became similar. The shape of the surface roughness probability distributions agrees with those of airborne electromagnetic induction measurements of ice thickness. The ice in Fram Strait had a greater mean surface roughness, 0.16 m vs 0.09 m, and a wider distribution in roughness values than the ice in the Nansen Basin. An increase in surface roughness with increasing ice thickness was observed over fast ice found in Fram Strait near the coast of Greenland but not for the drift ice.
Un roman familial ré-écrit, ou Louis Aragon au Cambodge
Authors: Duterte Pierre 
Published: March 2015

Le roman familial de Freud est certainement une protection mise en place par le système familial pour supporter une situation difficile ; il rend psychiquement acceptable ce qui serait, sans cette réécriture, insupportable. Cette ré-écriture de l’histoire ou de l’Histoire peut aussi très vite devenir un carcan, un piège, un obstacle à l’ouverture d’esprit et à la création. Pour le patient dont nous présentons le cas clinique, le roman et l’histoire familiale se mêlaient à l’Histoire avec un grand H.
Histoire de famille et transgression des thérapeutes
Authors: Cassanas Jean , Girolet Marie-Hélène 
Published: March 2015

Dans une séance en co-thérapie, l’un des deux thérapeutes propose de faire à la fin sa sculpture de la famille en y incluant l’autre thérapeute. Cette « transgression » s’avère être a posteriori un acte thérapeutique posant la question des relations complexes entre histoire de la famille, résonance et créativité.
La Russie dans le cyberespace : représentations et enjeux
Authors: Limonier Kévin 
Published: March 2015

Depuis une décennie, la Russie est devenue un acteur majeur du « cyberespace ». Disposant tout à la fois d’une économie numérique développée et d’une importante zone d’influence linguistique, la Fédération s’appuie sur cette nouvelle forme de puissance pour prolonger, sur les réseaux, les grandes postures géopolitiques qui caractérisent la Russie contemporaine. Cet article se propose donc d’étudier le segment russe du cyberespace sous l’angle des représentations territoriales et des rivalités de pouvoir qu’il suscite ou alimente. Il s’agira notamment de montrer qu’il constitue une importante « caisse de résonance » pour des problématiques qui concernent l’espace postsoviétique dans son ensemble.
La guerre des étoiles
Authors: Cardon Vincent 
Published: March 2015

Cet article analyse des réactions de l’industrie hôtelière à l’introduction d’un site de commentaires en ligne. Qu’advient-il lorsque, sur un marché déjà très équipé, un nouvel acteur fait irruption dans la chaîne de définition de la qualité et de valorisation des produits ; qu’il propose au consommateur des principes d’évaluation se revendiquant comme neufs et une nouvelle économie informationnelle ? Comment réagissent les acteurs en présence ? Cohabitation pacifique ou, au contraire, lutte des principes de définition de la qualité et de l’information pertinente, autrement dit, « guerre des étoiles » ? La question revient à s’interroger sur la plasticité des régimes de coordination marchands lorsqu’ils sont confrontés à un choc exogène, en l’espèce, une innovation socio-technique autorisant de nouveaux modes de circulation de l’information et de cristallisation d’une connaissance sur le marché. Le cas de l’industrie du tourisme est propre à fournir quelques éléments d’élucidation des effets de l’introduction d’outils algorithmiques d’évaluation des biens sur la chaîne d’acteurs impliqués dans la coordination de l’offre et de la demande et dans la structuration du marché par la qualification des biens qui s’y échangent.