bluuebunny/crossref_metadata_2025_split huggingface dataset:
L'oosterboschite (Pd, Cu)7 Se5, une nouvelle espèce minérale et la trogtalite cupro˗palladifère de Musonoï (Katanga)
Authors: Johan Zdenek , Picot Paul , Pierrot Roland , Verbeek Théodore 
Published: March 2019

L'oosterboschite, (Pd, Cu)₇Se₅ a été trouvée à Musonoï (Katanga), associée à la trogtalite cupro˗palladifère et à un autre minéral non identifié. Le diagramme de poudre a pu être indicé (méthode d'Ito) avec : a = 10,42 ± 0,02 ; b = 10,60 ± 0,02 ; c = 14,43 ± 0,02 Å ; V = 1 594 Å³ ; Z = 8 ; dx = 8,48 ; raies intenses du diagramme de poudre : 4,48 (6) ; 2,736 (7D) ; 2,647 (10) ; 2,600 (8) ; 2,244 (7D) ; 1,935 (7) ; 1,903 (7) ; 1,847 (8).
En lumière réfléchie, l'oosterboschite est blanc-jaune avec une pointe de crème ; entre nicols croisés, anisotropie assez intense dans des teintes de gris bleuté à gris brunâtre. Pouvoir réflecteur en % : 40,6-43,9 (4 200 Å) ; 44,8-49,5 (5 400 Å) ; 43,0-48,1 (6 400 Å). Macles polysynthétiques. Microdureté (Vickers) : 340 kg/mm². Deux analyses à la microsonde électronique ont donné : Se = 38,8-39,2 ; Pd = 44,9-44,1 ; Cu = 17,1-16,7 ; total = 100,8-100,0. Les résultats conduisent à la formule (Pd, Cu)₇Se₅. Le nom est donné en l'honneur de M. R. Oosterbosch.
Le trogtalite palladifère montre la composition (analyse à la microsonde électronique) : Se = 69,8 ; Co = 17,1 ; Cu = 9,00 ; Pd = 4,7 ; total = 100,6 ; cubique, a = 5,93 Å.
La camptonite de San Feliú de Buxalleu (province de Gérone, Espagne)
Authors: Velde Danielle , Tournon Jean 
Published: March 2019

A camptonite dyke occuring near San Feliú de Buxalleu has been subjected to detailed petrographic study. The rock is composed of altered olivine, clinopyroxene and brown amphibole phenocrysts in a groundmass of basic plagioclase, analcite and brown amphibole. There are three generations of clinopyroxene, the latest being comparatively enriched in Al and Ti and poor in Si. The brown amphibole phenocrysts were found to be of pargasite-ferrohastingsite composition, and can be called kaersutite.
A comparison is made between this rock and the type camptonite from New Hampshire (U. S. A.), and a new analysis is given for the amphibole from this latter rock.
This study is based upon six new chemical analysis.
The evolution of microstructure during the transformation of Mg2GeO4 olivine to spinel
Authors: Rubie David C. , Champness Pamela E. 
Published: March 2019

On a étudié la transformation olivine → spinelle en fonction du temps dans Mg2GeO4 à l'aide de la microscopie optique et électronique en transmission. On n'observe pas de relations d'orientation simples entre l'olivine et le spinelle et la transformation n'implique donc pas de cisaillement aux conditions de température et pression des expériences.
Dans les premiers stades de la transformation (< 5 h) à 900 °C, 20 kbar, une grande densité de dislocations et une structure de sous-joints se développent dans l'olivine résiduelle par un processus de restauration dynamique. A 800 °C, 10 kbar, on observe une grande densité de dislocations mais pas de restauration. Ces microstructures sont attribuées à de fortes contraintes différentielles résultant de la variation de volume de — 8 %. Le spinelle se nuclée probablement d'abord aux joints de grains de l'olivine, à la surface des pores résiduels et à la surface de l'échantillon. Le spinelle croît sous forme d'agrégats caractérisés par des sous-joints et des joints de grains. La taille de grain moyenne ~ 1 µm est nettement plus petite que celle de l'olivine de départ (~ 30 µm). Cette réduction de taille de grain est probablement due au champ de contrainte qui se développe autour des particules durant leur croissance ; ce champ peut éventuellement bloquer leur croissance. Un nouveau grain d'orientation différente nuclée alors à la paroi d'interphase.
Les fautes {110} présentes dans le spinelle sont, pour l'essentiel, attribuées à la dissociation des dislocations en partielles.
Solubilité des hydroxydes d'aluminium dans l'eau à 80 °C
Authors: Sanjuan Bernard , Michard Gil 
Published: March 2019

On a mesuré la solubilité de l'hydroxyde d'aluminium dans l'eau à 80 °C en fonction du pH. Les produits de solubilité (p*Ks4) mesurés en milieu acide et en milieu basique diffèrent de plus d'une unité (10,9 et 12,6). Cette différence est liée au fait que la gibbsite évolue en bayérite (ou nordstrandite) dans les solutions basiques alors qu'elle reste stable dans les solutions acides. La comparaison avec une étude précédente effectuée à 50 °C permet de déterminer la courbe de variation du produit de solubilité de la bayérite.
log*Ks4 = 46,35 - 6286/T - 16,1 log T
et de la gibbsite "microcristalline"
log Ks0 = 177,49 - 13135/T - 67,3 log T.
Prenant en compte les nombreuses autres déterminations, nous présentons en conclusion un tableau des ΔGf0 et ΔHf0 des ions et hydroxydes d'aluminium.
A new method for obtaining the principal reflectances of absorbing minerals
Authors: Marcos Pascual Celia , Virgós Rovira José M. 
Published: March 2019

A computer program has been developed which allows a refinement of reflectance measurements on polished grain mounts of absorbing minerals, using Fourier analysis. The observed reflectances of each section are obtained from eight measurements, by rotating the stage through 45° sectors.
Statistical processing of the results, corresponding to 100 random sections, gives the sample statistical parameters.
An inference method for the principal reflectances of a mineral can be derived from the sample statistical parameters.
The inference method has been applied to an absorbing anisotropic mineral, stibnite, which has yielded values for the principal reflectances at a wavelength of 546 nm. These values in air are : Rg = 45.2 ± 0.5, Rm = 40. 1 ± 0.7 and Rp = 30.7 ± 0.6 ; and in oil : Rg = 29.7 ± 0.4, Rm = 25.2 ± 0.8 and Rp = 16.0 ± 0.7 ; the error intervals correspond to a confidence limit of 95.45 %. From the principal reflectances determined in two immersion media, the optical constants can be obtained (n, refractive index and k, absorption coefficient) : ng = 3.24, nm = 3.16, np = 3.11, kg = 2.40, km = 1.90 and kp = 1.03.
L'eucrite de Bouvante. Chimie, pétrologie et minéralogie
Authors: Christophe Michel-Lévy Mireille , Bourot-Denise Michèle , Palme Herbert , Spettel Bernhardt , Wänke Heinrich 
Published: March 2019

The Bouvante eucrite, meteorite found on 30-07-1978, is a monomict recrystallized basaltic breccia. The mineralogy consists of zoned plagioclase and pyroxenes. These have rather constant Mg-contents (10-11 % MgO) while Ca and Fe contents show considerable variations. Tridymite, quartz, chromite, ilmenite, zircon, merrillite, iron and troilite are also found.
Chemical analyses show that this basalt which belongs to the Fe-rich end of the eucrite range is richer in incompatible trace-elements than all similar rocks analysed so far. It may represent a very low degree of partial melting of the source-rocks ; it would have flown superficially before being covered by a thick layer of debris and it would have come again on the surface of the parent body when impacted.
Impulsive Electromagnetic Emission near a Black Hole
Authors: Thompson Christopher 
Published: March 2019

Abstract
The electromagnetic signature of a point explosion near a Kerr black hole (BH) is evaluated. The first repetitions produced by gravitational lensing are not periodic in time; periodicity emerges only as the result of multiple circuits of the prograde and retrograde light rings and is accompanied by exponential dimming. Gravitational focusing creates a sequence of concentrated caustic features and biases the detection of a repeating source toward alignment of the BH spin with the plane of the sky. We consider the polarization pattern in the case of emission by the Lorentz upboosting and reflection of a magnetic field near the explosion site. Then the polarized fraction of the detected pulse approaches unity, and rays propagating near the equatorial plane maintain a consistent polarization direction. Near a slowly accreting supermassive BH (SMBH), additional repetitions are caused by reflection off annular fragments of an orbiting disk that has passed through an ionization instability. These results are applied to the repeating fast radio burst (FRB) source 121102, giving a concrete and predictive example of how FRB detectability may be biased by lensing. A gravitational lensing delay of 10–30 s, and reflection delay up to ∼104 s, are found for emission near the innermost stable circular orbit of a 3 × 105
M
⊙ SMBH; these effects combine to produce interesting correlations between delay time and burst fluence. A similar repetitive pulse envelope could be seen in the gravitational wave signal produced by a collision between compact stars near a SMBH.
Des archives pour l’anthropologie : futurs possibles et passés contingents
Authors: Zeitlyn David 
Published: March 2019

Derrida et Foucault ont fourni des clefs pour comprendre les archives. Ils voient les archives comme hégémoniques, caractéristiques des façons de penser, des modes de colonisation et de contrôle des citoyens. Cependant ils montrent aussi clairement que les archives peuvent être lues de façon subversive. Avec de la patience, une contre-lecture permet la mise au jour des voix (quelque fois des noms) des subalternes et autres exclus des archives. En lisant le long et contre le grain, les chercheurs peuvent suivre le développement des idées et leurs évolutions au travers des périodes historiques. Les archives peuvent être vues comme orphelines, contenant des substituts de performances. Les archives (papier et digitales) permettent aussi l’accès aux résultats des recherches anthropologiques selon les prescriptions des codes éthiques, mais la mise au point de ces codes peut être sujet à controverse. Quelles sortes de consentement et quelles sortes d’anonymisation peuvent être proposées ? Les archives gérées par les groupes traditionnellement étudiés par les anthropologues produisent un modèle d’archives radicales qui sont très différentes des archives conçues par les archivistes traditionnels.
The Lower Cretaceous male ofLebanoculicoides daheri– belonging to the earliest lineage of biting midges (Diptera: Ceratopogonidae)
Authors: Borkent Art 
Published: March 2019

AbstractRe-examination of the male biting midge ofLebanoculicoides daheriChoufani, Azar, and Nel (Diptera: Ceratopogonidae), in 127 million-year-old Lebanese amber, revealed further features and details of morphological, phylogenetic, and bionomic importance. The phylogenetic position of the fossil genusLebanoculicoidesSzadziewski as the sister group of all remaining extant and extinct Ceratopogonidae is confirmed. A revised key to all four known species of this genus is provided. A permanently erect antennal plume is hypothesised as an additional synapomorphy ofAustroconopsWirth and Lee and two Cretaceous fossil genera,MinyoheleaBorkent andArchiaustroconopsSzadziewski. The presence of a hind tibial comb and more distal row of spines is considered a synapomorphy of all Culicomorpha other than Chironomidae, with some secondary losses within this group.
Un modelo de oferta y demanda con incertidumbre
Authors: Burgos Simón Clara , Cortés López Juan Carlos , Martínez Rodríguez David , Navarro Quiles Ana , Villanueva Micó Rafael Jacinto 
Published: March 2019

<div class="page" title="Page 1"><div class="layoutArea"><div class="column"><p><span>El modelo lineal estático de oferta y demanda es uno de los modelos fundamentales que se estudia en la asignatura de Microeconomía del Grado de Administración y Dirección de Empresas y en otras titulaciones afines. Los estudiantes de estas titulaciones cursan simultáneamente asignaturas de Matemáticas y de Estadística, donde se presentan herramientas determinísticas y estocásticas, respectivamente, que tienen gran aplicabilidad en los modelos que aparecen en Economía. El trabajo que se presenta proporciona un ejemplo sencillo para trabajar de forma multidisciplinar las tres asignaturas anteriormente citadas. Concretamente, se propone la aleatorización del modelo lineal de oferta y demanda, considerando que los parámetros que aparecen en dicho modelo son variables aleatorias, en lugar de constantes deterministas. La motivación de esta “randomización”se basa en el hecho de que en la práctica dichos parámetros deben ajustarse a partir de muestras que contienen la incertidumbre asociada no solo a los errores del muestreo, sino también a la complejidad inherente al comportamiento de consumidor, que influye en la oferta del mercado. Utilizando técnicas de transformación de variables aleatorias, en el trabajo se determina la función de densidad de probabilidad de la funciones de oferta y demanda. Además, dado su interés, obtenemos las distribuciones del precio y de la cantidad de </span>equilibrio del mercado. Posteriormente, los resultados teóricos previamente establecidos son aplicados en un ejemplo numérico haciendo uso de datos obtenidos sintéticamente.</p></div></div></div>
Statistical analysis of magnetopause crossings at lunar distances
Authors: Mieth Johannes Z. D. , Frühauff Dennis , Glassmeier Karl-Heinz 
Published: March 2019

Abstract. Different magnetopause models with a diverse level of complexity are in use.
One thing that they have in common is that they are mainly based on near-earth observations; i.e. they
use measurements at distances of about ±10 Earth radii along the GSM
x axis. Only very few observations of magnetopause crossings at larger
distances are used for model fitting. In this study we compare position and
normal direction predictions of the Shue et al. (1997) magnetopause model with
actual observations of magnetopause crossings identified using the ARTEMIS
spacecraft at lunar distance, about 60 Earth radii. We find differences in
the location prediction between model and actual observation but good
agreement in predictions about the magnetopause normal direction.
High-spatial-resolution probability maps of drought duration and magnitude across Spain
Authors: Domínguez-Castro Fernando , Vicente-Serrano Sergio M. , Tomás-Burguera Miquel , Peña-Gallardo Marina , Beguería Santiago , El Kenawy Ahmed , Luna Yolanda , Morata Ana 
Published: March 2019

Abstract. Assessing the probability of occurrence of drought is important for improving
current drought assessment, management and mitigation measures, and strategies
across Spain. This study employed two well-established drought indices, the
Standardized Precipitation Index (SPI) and the Standardized Precipitation
Evapotranspiration Index (SPEI), to characterize drought duration and
magnitude at different timescales over Spain. In order to map the drought
hazard probability, we applied the extreme value theory and tested different
thresholds to generate peak-over-threshold (POT) drought duration and
magnitude series. Our results demonstrate that the generalized Pareto (GP)
distribution performs well in estimating the frequencies of drought magnitude
and duration. Specifically, we found a good agreement between the observed and
modelled data when using upper percentiles to generate the POT series.
Spatially, our estimations suggest a higher probability of extreme drought
events in southern and central Spain compared to the northern and eastern
regions. Also, our study found spatial differences in drought probability
estimations as a function of the selected drought index (i.e. SPI vs. SPEI)
and timescale (i.e. 1, 3, 6, and 12 months). Drought hazard probability maps
can contribute to the better management of different sectors (e.g. agriculture,
water resources management, urban water supply, and tourism) at national,
regional, and even local scale in Spain.
ÍNDICES DE DESENVOLVIMENTO EM JUVENIS Betta splendens ALIMENTADOS COM ADITIVOS ENZIMÁTICOS
Authors: GOMES Veruska Dilyanne Silva , AMÂNCIO Alda Lúcia De Lima , FILHO José Jordão , CAVALCANTI Cacio RiBeiro , BATISTA João Marcos Monteiro , SILVA José Humberto Vilar da 
Published: March 2019

A produção de peixes ornamentais vem se destacando como um dos setores mais lucrativos da piscicultura brasileira. O Betta splendens destaca-se por sua beleza, popularidade e por ser um dos peixes ornamentais mais comercializados. Neste âmbito, investir em aditivos alimentares como enzimas, pode melhorar o desempenho dos peixes. O experimento foi realizado com o objetivo de avaliar parâmetros de desempenho do peixe ornamental Betta splendens alimentado com dietas suplementadas pelas enzimas alfa-amilase e protease. Foram utilizados 120 alevinos distribuídos em 5 tratamentos com 4 repetições. Os tratamentos consistiram no fornecimento de uma ração comercial farelada com 55% de proteína bruta e suplementação enzimática nas seguintes proporções: 1 - Dieta referência sem suplementação com enzimas; 2 - Dieta referência + suplementação de 100 ppm de Alfa-amilase; 3 - Dieta referência + 100 ppm protease; 4 - Dieta referência + 100 ppm de Alfa-amilase + 200 ppm de protease; e 5 - Dieta referência + 200 ppm de alfa-amilase + 400 ppm de protease. Foram avaliados o peso, consumo de ração, conversão alimentar, comprimento, altura, largura e sobrevivência. O comprimento total (mm) dos betas aumentou quando alimentados com as dietas 3, 4 e 5. No entanto, novos estudos devem ser realizados para comprovar a eficácia da suplementação com enzimas digestivas para a espécie.
Hoya of Sumatra, an updated checklist, three new species, and a new subspecies
Authors: Rahayu Sri , Rodda Michele 
Published: March 2019

The list of the species of Hoya R.Br. occurring on the Indonesian island of Sumatra is updated and the type citation is clarified. Sixteen taxa are added to the latest checklist. Hoya danumensis subsp. amarii S.Rahayu & Rodda subsp. nov., H. rigidifolia S.Rahayu & Rodda sp. nov., H. solokensis S.Rahayu & Rodda sp. nov., and H. sumatrana S.Rahayu & Rodda sp. nov. are newly described. Hoya parviflora Wight, H. parvifolia Schltr., and H. purpureofusca Hook. are lectotypified.
Improved Efficiency of Inductive Power Transfer in Misalignment Conditions with Multi Coil Design
Authors: Laksono P. B. , Alaydrus M. 
Published: March 2019

In charging process of electric vehicle, a misalignment between the transmitter (Tx) and receiver (Rx) coupling structure decreases the efficiency of the wireless power transfer. In inductive power transfer system, misalignment reduces the effective coupling between the Tx and Rx coils. In this work, based on previous multiple coil structures, a new multi coil design in proposed to increase the efficiency of the power transfer. Here, a multi coil structure with two rectangular and four spiral coils is designed with the overall dimension of the coil structure 26.5 cm x 36.5 cm. The measurement shows, that for coil distance below 10.3 cm and a lateral misalignment of maximal 10 cm (27.4%), the efficiency of the designed multi coil structure is better compared to previous coil structures. However for larger coil distance or larger misalignment, the efficiency of the new coil structure deteriorates significantly.
Improvement of hydrogen production from Chlorella sp. biomass by acid-thermal pretreatment
Authors: Giang Tran T. , Lunprom Siriporn , Liao Qiang , Reungsang Alissara , Salakkam Apilak 
Published: March 2019

Background
Owing to the high growth rate, high protein and carbohydrate contents, and an ability to grow autotrophically, microalgal biomass is regarded as a promising feedstock for fermentative hydrogen production. However, the rigid cell wall of microalgae impedes efficient hydrolysis of the biomass, resulting in low availability of assimilable nutrients and, consequently, low hydrogen production. Therefore, pretreatment of the biomass is necessary in order to achieve higher hydrogen yield (HY). In the present study, acid-thermal pretreatment of Chlorella sp. biomass was investigated. Conditions for the pretreatment, as well as those for hydrogen production from the pretreated biomass, were optimized. Acid pretreatment was also conducted for comparison.

Results
Under optimum conditions (0.75% (v/v) H2SO4, 160 °C, 30 min, and 40 g-biomass/L), acid-thermal pretreatment yielded 151.8 mg-reducing-sugar/g-biomass. This was around 15 times that obtained from the acid pretreatment under optimum conditions (4% (v/v) H2SO4, 150 min, and 40 g-biomass/L). Fermentation of the acid-thermal pretreated biomass gave 1,079 mL-H2/L, with a HY of 54.0 mL-H2/g-volatile-solids (VS), while only 394 mL/L and 26.3 mL-H2/g-VS were obtained from the acid-pretreated biomass.

Conclusions
Acid-thermal pretreatment was effective in solubilizing the biomass of Chlorella sp. Heat exerted synergistic effect with acid to release nutrients from the biomass. Satisfactory HY obtained with the acid-thermal pretreated biomass demonstrates that this pretreatment method was effective, and that it should be implemented to achieve high HY.
Synergistic effect of PCPE1 and sFRP2 on the processing of procollagens via BMP1
Authors: Zhu Qin , Guo Wei , Zhang Shengjie , Feng Yang , Wang Xiao , Greenspan Daniel S. , Zhou Libin , Huang Guo‐Ru 
Published: March 2019

This article corrects: Synergistic effect of PCPE1 and sFRP2 on the processing of procollagens via BMP1, Volume 593, Issue 1, 119–127. Article first published 09 November 2018. https://doi.org/10.1002/1873-3468.13291Dr Daniel S. Greenspan was inadvertently omitted from the list of authors in the original publication. The correct list of authors is as shown above.Dr Daniel S. Greenspan affiliation and contact details are as follows:Department of Cell and Regenerative Biology, University of Wisconsin, Room 4503, WIMRII, 1111 Highland Ave, Madison, WI 53705, dsgreens@wisc.edu
A Redox Auxiliary Strategy for Pyrrolidine Synthesis via Photocatalytic [3+2] Cycloaddition
Authors: Amador Adrian G. , Sherbrook Evan M. , Yoon Tehshik P. 
Published: March 2019

AbstractCycloaddition reactions can be used to efficiently assemble pyrrolidine rings that are significant in a variety of chemical and biological applications. We have developed a method for the formal cycloaddition of cyclopropyl ketones with hydrazones that utilizes photoredox catalysis to enable the synthesis of a range of structurally diverse pyrrolidine rings. The key insight enabling the scope of photoredox [3+2] cycloadditions to be expanded to C=N electrophiles was the use of a redox auxiliary strategy that allowed for photoreductive activation of the cyclopropyl ketone without the need for an exogenous tertiary amine co‐reductant. These conditions prevent the deleterious reductive ring‐opening of the cyclopropyl substrates, enabling a range of less‐reactive coupling partners to participate in this cycloaddition.
Stereoselective Synthesis of the Spirocyclic Ring System of the Sesquiterpene Spirolepechinene
Authors: Duhamel Nina , Larcher Roberto , Guella Graziano , Pilkington Lisa I. , Fedrizzi Bruno , Barker David 
Published: March 2019

AbstractSesquiterpenes are a structurally diverse class of compounds that have been isolated from a wide range of living organisms. Spirolepechinene is a member of the rare spirojatamane class of sesquiterpenes with a unique relative stereochemistry about its spirocentre. While the other two members of this class have been synthesized, the differences in stereochemistry renders these previously‐reported methods not applicable to the synthesis of spirolepechinene. Herein we present an efficient method for the synthesis of the spirocyclic core of spirolepechinene that produces the required stereochemistry for this unique natural product with high diastereoselectivity.