bluuebunny/crossref_metadata_2025 huggingface dataset:
Q-compensated acoustic impedance inversion of attenuated seismic data: Numerical and field-data experiments
Authors: Chai Xintao , Tang Genyang , Wang Fangfang , Gu Hanming , Wang Xinqiang
Published: July 2018

Acoustic impedance (AI) inversion is of great interest because it extracts information regarding rock properties from seismic data and has successful applications in reservoir characterization. During wave propagation, anelastic attenuation and dispersion always occur because the subsurface is not perfectly elastic, thereby diminishing the seismic resolution. AI inversion based on the convolutional model requires that the input data be free of attenuation effects; otherwise, low-resolution results are inevitable. The intrinsic instability that occurs while compensating for the anelastic effects via inverse [Formula: see text] filtering is notorious. The gain-limit inverse [Formula: see text] filtering method cannot compensate for strongly attenuated high-frequency components. A nonstationary sparse reflectivity inversion (NSRI) method can estimate the reflectivity series from attenuated seismic data without the instability issue. Although AI is obtainable from an inverted reflectivity series through recursion, small inaccuracies in the reflectivity series can result in large perturbations in the AI result because of the cumulative effects. To address these issues, we have developed a [Formula: see text]-compensated AI inversion method that directly retrieves high-resolution AI from attenuated seismic data without prior inverse [Formula: see text] filtering based on the theory of NSRI and AI inversion. This approach circumvents the intrinsic instability of inverse [Formula: see text] filtering by integrating the [Formula: see text] filtering operator into the convolutional model and solving the inverse problem iteratively. This approach also avoids the ill-conditioned nature of the recursion scheme for transforming an inverted reflectivity series to AI. Experiments on a benchmark Marmousi2 model validate the feasibility and capabilities of our method. Applications to two field data sets verify that the inversion results generated by our approach are mostly consistent with the well logs.
A unified effective medium model for gas hydrates in sediments
Authors: Terry Darrell A. , Knapp Camelia C.
Published: July 2018

A unified effective medium model is developed to incorporate the endpoints of perfectly smooth and infinitely rough sphere components and to allow partitioning between rough and smooth grains. We incorporate the unified model into the framework for gas hydrates in unconsolidated sediments using pore-fluid and rock-matrix configurations for grain placement, while reviewing other developments that have taken place in the past four decades. The unified rock-matrix model is validated with data available from the 2002 Mallik gas hydrates project well 5L-38. Gas-hydrate saturation and neutron-porosity logs from this well are used to generate synthetic P- and S-wave velocity models for several values of the friction coefficient. First, we overlaid crossplots of P- versus S-wave velocities for synthetic and measured velocities, and we compared the match until a good choice was found for the friction coefficient. Second, we plotted the synthetic velocities as separate logs of P- and S-wave velocities for each friction coefficient; the synthetic velocity logs were then overlaid on the measured velocities calculated from the sonic logs. Results of a direct comparison of the synthetic and measured velocity logs provide valuable insights into the validation of the unified effective medium model. Recognizing the significance of the Hertz-Mindlin-type effective medium models for gas hydrates in unconsolidated sediments, we incorporate the previous efforts into a single “unified” model and define a common nomenclature. Although we attempt to assign a single friction coefficient value to each hydrate window, it is not surprising that in a real and heterogeneous environment, the value might vary with depth, as it does here at the larger spatial scales. We determine and quantitatively estimate that gas hydrates in sediments are well-predicted with a friction coefficient closer to a smooth sphere model than a rough sphere model.
Nonsplit complex-frequency shifted perfectly matched layer combined with symplectic methods for solving second-order seismic wave equations — Part 1: Method
Authors: Ma Xiao , Yang Dinghui , Huang Xueyuan , Zhou Yanjie
Published: July 2018

The absorbing boundary condition plays an important role in seismic wave modeling. The perfectly matched layer (PML) boundary condition has been established as one of the most effective and prevalent absorbing boundary conditions. Among the existing PML-type conditions, the complex frequency shift (CFS) PML attracts considerable attention because it can handle the evanescent and grazing waves better. For solving the resultant CFS-PML equation in the time domain, one effective technique is to apply convolution operations, which forms the so-called convolutional PML (CPML). We have developed the corresponding CPML conditions with nonconstant grid compression parameter, and used its combination algorithms specifically with the symplectic partitioned Runge-Kutta and the nearly analytic SPRK methods for solving second-order seismic wave equations. This involves evaluating second-order spatial derivatives with respect to the complex stretching coordinates at the noninteger time layer. Meanwhile, two kinds of simplification algorithms are proposed to compute the composite convolutions terms contained therein.
Correct structural index in Euler deconvolution via base-level estimates
Authors: Melo Felipe F. , Barbosa Valéria C. F.
Published: July 2018

In most applications, the Euler deconvolution aims to define the nature (type) of the geologic source (i.e., the structural index [SI]) and its depth position. However, Euler deconvolution also estimates the horizontal positions of the sources and the base level of the magnetic anomaly. To determine the correct SI, most authors take advantage of the clustering of depth estimates. We have analyzed Euler’s equation to indicate that random variables contaminating the magnetic observations and its gradients affect the base-level estimates if, and only if, the SI is not assumed correctly. Grounded on this theoretical analysis and assuming a set of tentative SIs, we have developed a new criterion for determining the correct SI by means of the minimum standard deviation of base-level estimates. We performed synthetic tests simulating multiple magnetic sources with different SIs. To produce mid and strongly interfering synthetic magnetic anomalies, we added constant and nonlinear backgrounds to the anomalies and approximated the simulated sources laterally. If the magnetic anomalies are weakly interfering, the minima standard deviations either of the depth or base-level estimates can be used to determine the correct SI. However, if the magnetic anomalies are strongly interfering, only the minimum standard deviation of the base-level estimates can determine the SI correctly. These tests also show that Euler deconvolution does not require that the magnetic data be corrected for the regional fields (e.g., International Geomagnetic Reference Field [IGRF]). Tests on real data from part of the Goiás Alkaline Province, Brazil, confirm the potential of the minimum standard deviation of base-level estimates in determining the SIs of the sources by applying Euler deconvolution either to total-field measurements or to total-field anomaly (corrected for IGRF). Our result suggests three plug intrusions giving rise to the Diorama anomaly and dipole-like sources yielding Arenópolis and Montes Claros de Goiás anomalies.
Finding clues in the p53 maze: an interview with Karen Vousden
Authors: Vousden Karen
Published: July 2018

Karen Vousden is an internationally renowned cancer scientist whose contributions to solving the p53 puzzle are changing the way we think about this important tumour suppressor. She has been honoured with many prizes and elected memberships throughout her career, and was appointed Commander of the Order of the British Empire (CBE) in 2010 and Foreign Associate of the US National Academy of Sciences in May 2018. Karen is an approachable and diligent scientist, a respected mentor and an inspirational role model. She is currently a group leader at the Francis Crick Institute in London and Chief Scientist at Cancer Research UK (CRUK). In this interview, Karen talks about the mentors that inspired her, the discoveries that brought about her interest in cancer metabolism, and her interests outside the lab.

Karen Vousden's research focuses on the many functions of p53 in cancer and beyond. Her scientific journey in the field of genetics started with undergraduate and graduate work on transfer RNA (tRNA) suppression with Lorna Casselton at the University of London, UK. She studied Ras and viral oncogenes during her postdoctoral training with Christopher Marshall and Douglas Lowy. The interactions between viral oncogenes and mammalian tumour suppressors drew her into the field of p53. Her group (in parallel with others) discovered the p53 targets PUMA and TIGAR, the latter of which spurred her interest in cancer metabolism.
Distinct metabolic states govern skeletal muscle stem cell fates during prenatal and postnatal myogenesis
Authors: Pala Francesca , Di Girolamo Daniela , Mella Sébastien , Yennek Siham , Chatre Laurent , Ricchetti Miria , Tajbakhsh Shahragim
Published: July 2018

During growth, homeostasis and regeneration, stem cells are exposed to different energy demands. Here, we characterise the metabolic pathways that mediate the commitment and differentiation of mouse skeletal muscle stem cells, and how their modulation can influence the cell state. We show that quiescent satellite stem cells have low energetic demands and perturbed oxidative phosphorylation during ageing, which is also the case for cells from post-mortem tissues. We show also that myogenic fetal cells have distinct metabolic requirements compared to those proliferating during regeneration, with the former displaying a low respiration demand relying mostly on glycolysis. Furthermore, we show distinct requirements for peroxisomal and mitochondrial fatty acid oxidation (FAO) in myogenic cells. Compromising peroxisomal but not mitochondrial FAO promotes early differentiation of myogenic cells. Acute muscle injury and pharmacological block of peroxisomal and mitochondrial FAO expose differential requirements for these organelles during muscle regeneration. Taken together, these observations indicate that changes in myogenic cell state lead to significant alterations in metabolic requirements. In addition, perturbing specific metabolic pathways impacts on myogenic cell fates and the regeneration process.
Functions of the Dictyostelium LIMP-2 and CD36 homologues in bacteria uptake, phagolysosome biogenesis and host cell defence
Authors: Sattler Natascha , Bosmani Cristina , Barisch Caroline , Guého Aurélie , Gopaldass Navin , Dias Marco , Leuba Florence , Bruckert Franz , Cosson Pierre , Soldati Thierry
Published: July 2018

Phagocytic cells take up, kill and digest microbes by a process called phagocytosis. To this end, these cells bind the particle, rearrange their actin cytoskeleton, and orchestrate transport of digestive factors to the particle-containing phagosome. The mammalian lysosomal membrane protein LIMP-2 (also known as SCARB2) and CD36, members of the class B of scavenger receptors, play a crucial role in lysosomal enzyme trafficking and uptake of mycobacteria, respectively, and generally in host cell defences against intracellular pathogens. Here, we show that the Dictyostelium discoideum LIMP-2 homologue LmpA regulates phagocytosis and phagolysosome biogenesis. The lmpA knockdown mutant is highly affected in actin-dependent processes, such as particle uptake, cellular spreading and motility. Additionally, the cells are severely impaired in phagosomal acidification and proteolysis, likely explaining the higher susceptibility to infection with the pathogenic bacterium Mycobacterium marinum, a close cousin of the human pathogen Mycobacterium tuberculosis. Furthermore, we bring evidence that LmpB is a functional homologue of CD36 and specifically mediates uptake of mycobacteria. Altogether, these data indicate a role for LmpA and LmpB, ancestors of the family of which LIMP-2 and CD36 are members, in lysosome biogenesis and host cell defence.
The Secular Trend of Brazilian Terms of Trade Revisited - 1850 to 2000
Authors: Jr. Sergio Kannebley , Gremaud Amaury Patrick
Published: July 2018

The purpose of this paper is to revisit the commonly argued secular deterioration of the Brazilian terms of trade using structural time series models. We argue that the ambiguity observed in previous studies about this topic is due to the lack of generality of the statistical specification. Specifically, the trend component used in those studies does not nest alternative specifications. Additionally, these representations do not allow multiple breaks and/or outliers. Diagnostic tests and forecasts suggest the superiority of the random walk with drift representation, in the presence of multiple breaks. The results obtained indicate the existence of a negative deterministic slope between the period of 1850 and 2000.
A Dynamic Price-Setting Mechanism for a Hybrid Matching Market
Authors: Sotomayor Marilda
Published: July 2018

After observing the problem of the intimate wear market of Nova Friburgo with the distribution of its product both in Brazil and abroad, we designed a dynamic allocation mechanism that sets the prices according to the demand from the buyers, based on their preferences, and that yields an allocation for the core of the market game in a finite number of steps. With this scheme, all agents are simultaneously present and all sellers sell to both national and international markets. We prove that the core allocation produced by this mechanism provides the lowest price among all outcomes for the core that maintains the same allocations of objects for international buyers as the final allocation. In addition, it coincides with the competitive allocation of minimum price equilibrium, when restricted to the national market, and with the allocation produced by the GaleShapley algorithm (1962), in which buyers make proposals and where there is a convenient tie-breaking rule, when all buyers are from abroad.
The Use of Martingale Theory for the Superreplication of Exotic Options in Incomplete Markets
Authors: Zimmer Christian Johannes
Published: July 2018

In this article we show the importance of modern martingale theory for the pricing and hedging of exotic options, especially in incomplete markets. When emitting an exotic option, the seller firstly has to ask himself whether there exists a hedging strategy for this title or not. Especially, when he wants to use a more realistic model than the simple Black-Scholes framework, the answer is not always obvious. We show in this article how to analyze this problem in the case of an exotic option, the Generalized Bermudian Option, which will turn out to be a generalization of the American option.
Political uncertainty and monetary unions
Authors: Gonçalves Carlos Eduardo Soares
Published: July 2018

The purpose of this article is to provide a political economy rationale that helps explain why some non-central European economies, featuring highly idiosyncratic disturbances and apparently low inflation bias inefficiencies, seem so eager to enter the European Monetary Union (EMU). The main message from the paper is that because these economies normally display a high degree of domestic political uncertainty, the "economic costs" arising from the decision to surrender monetary policy may in fact be less severe than the "political costs" of opting out of EMU and then possibly facing undesired inflation upsurges in the future.
Long memory in the R$ / US$ exchange rate: A robust analysis
Authors: Laurini Márcio Poletti , Portugal Marcelo Savino
Published: July 2018

This article shows that the evidence of long memory for the daily R$ /US$ exchange rate series after the implementation of the Real Plan is not robust when we analyze the existence of structural breaks in this series. We demonstrate that the long memory observed is caused by changes in the structure of variance, captured by a Markov Switching model in all the parameters. A Monte Carlo study shows that the long memory structure can be induced by changes in the unconditional variance parameters, and that the data generating mechanism is a short memory process.
An Analysis of Quit and Dismissal Determinants between 1988 and 1999 using the Bivariate Probit Model
Authors: Orellano Veronica I. F. , Picchetti Paulo
Published: July 2018

Excessive labor turnover may be considered, to a great extent, an undesirable feature of a given economy. This follows from considerations such as underinvestment in human capital by firms. Understanding the determinants and the evolution of turnover in a particular labor market is therefore of paramount importance, including policy consider- ations. The present paper proposes an econometric analysis of turnover in the Brazilian labor market, based on a partial observability bivariate probit model. This model consid- ers the interdependence of decisions taken by workers and firms, helping to elucidate the causes that lead each of them to end an employment relationship. The Employment and Unemployment Survey (PED) conducted by the State System of Data Analysis (SEADE) and by the Inter-Union Department of Statistics and Socioeconomic Studies (DIEESE) provides data at the individual worker level, allowing for the estimation of the joint prob- abilities of decisions to quit or stay on the job on the worker’s side, and to maintain or fire the employee on the firm’s side, during a given time period. The estimated param- eters relate these estimated probabilities to the characteristics of workers, job contracts, and to the potential macroeconomic determinants in different time periods. The results confirm the theoretical prediction that the probability of termination of an employment relationship tends to be smaller as the worker acquires specific skills. The results also show that the establishment of a formal employment relationship reduces the probabil- ity of a quit decision by the worker, and also the firm’s firing decision in non-industrial sectors. With regard to the evolution of quit probability over time, the results show that an increase in the unemployment rate inhibits quitting, although this tends to wane as the unemployment rate rises.
Wolframite - stibnite mineral assemblages from Rizana Lachanas, Macedonia, Greece and their possible use as flux agent in the manufacturing of clinker
Authors: ΒΑΣΙΛΑΤΟΣ Χ. , ΜΠΑΡΛΑΣ Κ. , ΣΤΑΜΑΤΑΚΗΣ Μ. , ΤΣΙΒΙΛΗΣ Σ.
Published: July 2018

In the current study it is investigated the possibility of use of wolframite and stibnite ore from Lachanas area, Northern Greece, as flux agent in the production of cement. The stibnite and wolframite deposits of that area are typical of the Sb-W type of mineralization. The Sb ore occurs more massive and volumetrically more extended than W ore. The ore bodies have been partially altered to secondary minerals of oxidation zone. The neoformed minerals have affected the original Sb and W content of the ore. However the oxidation of the deposit does not affect its use as flux agent in cement industry. It is well known that the most energy demanding stage in the cement industry is the sintering process. It has been found that certain additives may accelerate the sintering reactions and improve the reactivity of the cement raw mix. The minerals, iron rich wolframite, stibnite and a wolframite-stibnite assemblage were selected in order to introduce W, Sb and S in the cement raw mix. One reference sample and 12 test samples prepared by mixing the reference sample with the above minerals in 0.5,1.0,1.5 and 2.0% w/w were studied. The effect on the reactivity of the raw mix is evaluated on the basis of the un-reacted lime content in samples sintered at 1000, 1100, 1200, 1300, 1350, 1400 and 1450°C. It is concluded that minerals containing Sb promote the consumption of the free lime, in the most effective way. The XRD studies, performed in samples that were burned at 1450°C, showed that the diffraction patterns correspond to a structure of a typical clinker, obtained at the above temperatures.
Ultrahigh-pressure metamorphism of crustal rocks from the Rhodope metamorphic province: evidence from coesite, diamond and majoritic garnet in eclogites and metapelites
Authors: MPOSKOS E. , KOSTOPOULOS D.
Published: July 2018

The Rhodope Metamorphic Province represents an area of continental collision between the Balkan domain to the north and the Pangaeon domain to the south. Today, exposed astride the suture zone are Palaeozoic and Mesozoic protoliths of both continental and oceanic provenance that underwent Alpine deformation and metamorphism in a subduction zone setting. From petrostructural studies the picture that emerged is one of a central, structurally lower, marble-dominated terrain (i.e. a metamorphic core complex), and a surrounding, structurally higher, gneiss-dominated terrain. Here, for the first time, we report the presence of ultrahigh-pressure metamorphic indicator minerals such as coesite, diamond and Si-Ti-Na-P-rich (i.e. majoritic) garnet in amphibolitized eclogites and garnet-biotitekyanite gneisses from localities scattered throughout the structurally higher terrain. These findings, corroborated by optical microscopy, electron microprobe analyses and in situ laser Raman microspectroscopy, suggest that the protoliths of these rocks were dragged down to mantle depths exceeding 200 km. The individual pressure-temperature paths published before for various subunits of the structurally higher terrain should henceforth be regarded as peculiarities of the exhumation path followed by the subunits.
Low-P/High-T pre-Alpine metamorphism and medium-P Alpine overprint of the pelagonian zone documented in high-alumina metapelites from the Vernon massif, Western Macedonia, Northern Greece
Authors: MPOSKOS E. , KOSTOPOULOS D. K. , KROHE A.
Published: July 2018

A low-P / high-T metamorphic event (andalusite-sillimanite series) of pre-Alpine age, identified here for the first time, has affected the metapelitic rocks of the Vernon Massif. P-T conditions of metamorphism in the western part of the Massif are estimated at -2.5 kb / 600-610°C, while in the northeastern part they are estimated to have exceeded 4.5 kb / 640°C respectively. Such P-T conditions correspond to geothermal gradients of 68°C/ km and 40°C/km for the western and the northeastern parts of the Massif respectively. The inferred steep geothermal gradients require transport of heat from deeper to shallower levels within the crust, achieved via magmatic intrusions in a continental magmatic arc setting. Alpine overprinting is characterized by P-T metamorphic conditions of ~6 kb / <350°C in the western part and ~9 kb / <570°C in the northeastern part of the Massif respectively. Low-P / high-T metamorphic rocks, occurring as klippen in the Cyclades and as blocks in the ophiolitic milanges of Crete, are interpreted as remnants of the pre-Alpine Pelagonian nappe similar to those occurring in the Vernon Massif.
Global Geochemical baselines for environmental management in the new millennium
Authors: ΔΗΜΗΤΡΙΑΔΗΣ Α.
Published: July 2018

It is a well-known fact that international interest, during the last few years, has been turned onto the possible hazardous consequences on the health of humans, animals and plants, because of environmental contamination by toxic chemical elements. The rapid rates of economic development and population increase on our planet have caused the aggravation of environmental problems, concerned with degradation from uncontrolled urban and industrial development, intensive agriculture and overexploitation of water resources. All these problems are affecting, on a global scale, the chemistry and sustainability of life support systems. The methodology applied to evaluate the intensity and area extent of these problems, as well as their effects, is concerned with the recognition of changes in the level of chemical elements on the earth's surface environment, which is the subject studied by the branch of science known as applied geochemistry. Consequently, to secure the sustainable development of our planet, it is required to create a high quality geographical information database of the chemistry of surface earth materials on which the well-balanced development of life is based. The Geological Survey of each country is participating in the project of "Global Geochemical Baselines", which aims to compile the multielement Global Geochemical Atlas, that is the chemical atlas of earth materials for 78 chemical elements by the year 2010. The European part of the project has started in 1998, and results will be published by the year 2004. Resulting information will be useful to agriculture, animal-rearing, epidemiology, urban planning, legislation and to policy- and decision-makers in general, which are all related to the sustainable development of our planet. Completion of this very significant project for effective management of the global surface environment in the new millennium, and for better quality of life of the present and all future generations, will depend on the availability of funds.
Environmental geology: Branch of geosciences or a marketing term?
Authors: ΔΗΜΗΤΡΙΑΔΗΣ Α.
Published: July 2018

Environmental Geology is considered to have been coined for the environmental sensitive market. It originated in the United States in the late 1960's to attract students to save the closure of University Geology Departments. After almost thirty years there are still questions about its viability as a stand alone branch of geological sciences, since by definition it encompasses all the specialised branches of engineering geology, economic geology, structural geology, hydrogeology, geochemistry, geophysics, etc. The environmental geologist must, therefore, be a "super geologist", which is an impossibility by present day standards. University curricula in Environmental Geology still teach the basic geological subjects of geology degrees, since these serve as a strong foundation for courses in the environmental field. In the United States, students are required to take at least four elective courses in environmentally orientated earth science subjects during their first degree. Whereas in the United Kingdom a Master of Science course in environmental subjects is recommended as a follow-up to the first degree in Environmental Geology, again a misnomer for the degree in pure Geology. It is quite apparent that Universities jumped on the bandwagon of the environmental market, without serious thought into what they were embarking. They created a non-existent market orientated branch of geological sciences, Environmental Geology, and they subsequently realised that it is impossible to produce the "super student" and the "super geologist", for this is what is in fact demanded. It is strongly believed, that specialists in the different branches of geological sciences, because of their in depth study of the natural geological environment and its processes, have considerable knowledge and expertise to be applied in the solution of environmental problems. This must, therefore, be advertised by both Universities and State Geological Surveys, for advertising is a more powerful tool of getting the message across to the public and to policy-makers, rather than by making up new branches of science with no content.
Levels and possible sources of heavy metals in surficial sediments of lake Vegoritis
Authors: ΣΚΟΥΛΙΚΙΔΗΣ Ν. Θ.
Published: July 2018

Vegoritis is a large, deep, mesotrophic, typical karstic lake in ΝW Greece surrounded by mountains and Ptolemais Basin situated at its southern part. The Ptolemais Basin is subjected to the effluents of lignite mines, electric power generating plants, partly treated urban wastewaters, landfills, agricultural manufacturing units and agrochemicals from an extensively cultivated area. All these are carried into the lake through both, the atmosphere and surface runoff (Soulou River). The rock types of the mountainous part of the catchment area surrounding the lake are carbonates, acid metamorphic silicates and marble with schist and serpentinite, whereas the plain area is covered by fluviolacustrine pliocene, pleistocene and alluvial sedimentary formations. In order to identify the levels, and assess the origin of heavy metals in the surficial lake sediments 26 samples were collected using a grab sampler. Samples were analysed for their grain size, as well as for their mineral, organic matter, major element (Si02, A1203, Ti02, Fe203 , Kf>, Na20, CaO, MgO, P205, MnO, S) and heavy metal content (V, Cr, Mn, Co, Ni, Cu, Zn, As, Rb, Sr, Mo, Ba, Pb). Data were processed by multivariate statistical techniques and the main results and conclusions discussed. The heavy metals levels are low, when compared to nearly pristine lakes and normal soils. Even Cu, Pb and Zn, which are mainly derived from human activities, exhibit lower levels than in nearly pristine lakes. Only Ba, Cr, Ni and As are present in relatively high values. Ba is derived from the erosion of acid silicate rocks. Chromium originates primarily from the serpentinites and secondarily from pollution, whereas for Ni the opposite is true. The presence of As is due to fly ash deposition. The distribution of heavy metals in the lake sediments depends on lithology and pollution sources. Thus the southern part of the lake is enriched with V, Mn, Rb, Pb Fe and As from fly ash deposition. Cr, Co, Ni, Cu, Zn and Mo are derived through the Soulou R. outflow. In the northern part of the lake the weathering of acid silicate rocks contributes to the high concentrations of Ba, Rb and Sr. Considering the high anthropogenic pressure present in the area, the generally good environmental status of the lake, is attributed to its self purification potential resulting from the low retention time of the lake's water. Since As and Cr, depending on their valence state, can be considered as toxic and carcinogenic factors, a more detailed research study is suggested to be carried out.
South Kavala Gas Field - Taphrogenetic Prinos Basin
Authors: ΠΡΟΕΔΡΟΥ Π.
Published: July 2018

The South Kavala gas field located at the southwest edge of the Prinos basin was discovered at the turn of 1972 -73. The basin formation started in the middle Miocene with continental deposits. Later on the sea transgressed all over the basin until the south Kavala ridge at the southern limit lifted up and transformed it to a lagoon, leading to the formation of Evaporites in upper Miocene time. At Pliocene the sea dominated again covering even the previous mentioned ridge. An unconformity exists between Miocene and Pliocene visible mainly on the basin flanks. The trapping mechanism is a combination of a roll-over anticline in front of a northeast - southwest syngenetic fault and a pinch - out of the sediment deposits to the southwest towards the South Kavala ridge. The basement itself forms an erosional high. The gas reservoir is found between two evaporitic horizons and consists mainly of sandstone, microconglomeratic alternating with shale and marl. It is of turbiditic origin forming sedimentological cycles. Individual facies A4/B2, C and E representative of the turbidite facies classification of Walker and Mutti (1973) have been recognised. The net pay thickness is small and amounts up to eleven meters. The gas consists 83% of methan, 7.5% of ethan, 1.5% of propan and around 1.5% of butan. It is free of H2S and contains condensate. As source rocks are considered the under continental and marine conditions deposited preevaporitic shales. The coal beds are also considered to be potential source rocks. The gas is of low maturity and its generation started during latest Miocene and continued through the Pliocene. The main migrations paths apparently were along the faults that cross the basin. The in place reserves are close to 1.109m3 αερίου. The field is on production from 1981 and 80% of the recoverable reserves have been already produced.
Migration and trapping of the Ionian series hydrocarbons (Epirus, NW Greece)
Authors: KARAKITSIOS V. , RIGAKIS N. , BAKOPOULOS I.
Published: July 2018

Surface oil shows in the Ionian zone of NW Greece are mainly linked to the organic matter rich Lower Posidonia beds of Toarcian age and shale fragments within the Triassic breccias. The calcareous formations of the Ionian series are characterized by insignificant primary porosity-permeability. Only fractured carbonates might comprise potential reservoir rocks capped on top by the detrital series. Other prospective traps, with the evaporites playing the role of cap-rocks, are related to the degree of basement involvement in the structural evolution of the Ionian basin.
The model of gas pool formation in Frakulla area, Albania
Authors: KOCI R. , GJIKA A. , AVDULAJ Q. , KOCI S.
Published: July 2018

Frakulla diapir is one of the studied diapirs in Albania. It is located in the western part of Albania. The Serravallian to Pliocene sediments belongs to the uppermost part of the Adriatic Basin, which is included in the central Mediterranean Basins group. Some anticline and syncline structures are indicated in the western part of Albania. These structures are placed in a linear way forming some structural ranges with SSE-NNW axis direction. Frakulla is one of these structures as a part of Vlora-Panaja-Frakkull range (Fig. 1). Based on the surface geology, well data and the interpretation of the seismic sections results that this structure is formed as a consequence of the mud diapir growth. This diapir is complicated with tectonic faults in both western and eastern flanks, which dip with angle 45-90° The southern and northern ends of the structure are clearly seen in the seismic sections and a number of wells penetrated these ends. We think that the Frakulla structure is a typical mud diapir surrounding in all directions by many gas sandstone beds. These sandstones are formed in a deltaic environment during the Messinian (Globorotalia conomiozea zone). Some factors affected the quantity of hydrocarbon accumulation are discussed in this paper like: structural character of the area, pattern and complexity of faulting around and over the mud diapir, depositional environment, rate of growth of the diapir and time of uplift. We think that the presence of gas accumulation in Frakulla area is as a consequence of a favorable interrelation of these factors
EpiLog: A software for the logical modelling of epithelial dynamics
Authors: Varela Pedro L. , Ramos Camila V. , Monteiro Pedro T. , Chaouiya Claudine
Published: July 2018

Cellular responses are governed by regulatory networks subject to external signals from surrounding cells and to other micro-environmental cues. The logical (Boolean or multi-valued)  framework proved well suited to study such processes at the cellular level, by specifying qualitative models of involved signalling pathways and gene regulatory networks. 

Here, we describe and illustrate the main features of EpiLog, a computational tool that implements an extension of the logical framework to the tissue level. EpiLog defines a collection of hexagonal cells over a 2D grid, which embodies a mono-layer epithelium. Basically, it defines a cellular automaton in which cell behaviours are driven by associated logical models subject to external signals. 

EpiLog is freely available on the web at http://epilog-tool.org. It is implemented in Java (version ≥1.7 required) and the source code is provided at https://github.com/epilog-tool/epilog under a GNU General Public License v3.0.
Coordination of legal technology in Europe
Authors: Максуров Алексей , Maksurov Aleksey
Published: July 2018

The book will prove useful not only to lawyer-scientists and students (graduate students), jurists, political scientists, sociologists, but also practicing lawyers, specialists in the field of state and municipal law and government, international, including European law. The work reflects the results of author's research on the law and legislation of more than 50 countries and dependent territories of Europe, references to more than 1500 normative acts of foreign countries, studied and systematized by the content of the author in order to facilitate their perception by the reader
Simultaneous Penalization and Subsidization for Stabilizing Grand Cooperation
Authors: Liu Lindong , Qi Xiangtong , Xu Zhou
Published: July 2018

In this paper we propose a new instrument, a simultaneous penalization and subsidization, for stabilizing the grand coalition and enabling cooperation among all players of an unbalanced cooperative game. The basic idea is to charge a penalty z from players who leave the grand coalition, and at the same time provide a subsidy ω to players who stay in the grand coalition. To formalize this idea, we establish a penalty-subsidy function ω(z) based on a linear programming model, which allows a decision maker to quantify the trade-off between the levels of penalty and subsidy. By studying function ω(z), we identify certain properties of the trade-off. To implement the new instrument, we design two algorithms to construct function ω(z) and its approximation. Both algorithms rely on solving the value of ω(z) for any given z, for which we propose two effective solution approaches. We apply the new instrument to a class of machine scheduling games, showing its wide applicability.

The e-companion is available at https://doi.org/10.1287/opre.2018.1723 .
Assessing Advisor Competencies: A Delphi Method Study
Authors: Menke Donna , Stuck Shaunna , Ackerson Sara
Published: July 2018

Through the Delphi method study, we sought to identify essential competencies for entry-level academic advisors. Three surveys were administered to academic advisors with 5 years or more working in the field. Results from 57 advisors who completed all 3 rounds of surveys indicated a wide range of competencies essential for entry-level academic advisors. Consensus centered around 3 essential competencies: Communication skills, interpersonal skills, and knowledge of university policies and resources. We discuss the implications for practice and propose ideas for additional research.
Affirmation, Support, and Advocacy: Critical Race Theory and Academic Advising
Authors: Lee Jasmine A.
Published: July 2018

The research presented describes the unique challenges of students from historically marginalized communities, particularly Black students, attending predominantly White institutions. Challenges include overt and covert campus racism, daily microaggressions, and limited or no sense of belonging. How are these challenges exacerbated when a student's academic advisor is unable or unwilling to understand their daily experiences on a predominantly White campus? How can academic advisors work to affirm, support, and advocate for underrepresented students during their matriculation? Using critical race theory to improve practice for academic advisors, I call for advisors to gain and maintain a consciousness of the ways race and racism influence not only the experiences of students of color but also their relationships with academic professionals.
Shadowing the image archive: In Medias Res: Inside Nalini Malani’s Shadow Plays, Mieke Bal (2016)
Authors: Sawhney Rashmi
Published: July 2018

Berlin: Hatje Cantz Verlag, 440 pp., ISBN 9783775741460, hardback, €45
Negociar en el caribe colombiano: aproximaciones a la comprensión del texto y del contexto de un pregón callejero
Authors: Fonseca Mendoza Clara Inés
Published: July 2018

Presentamos una propuesta dirigida a desarrollar competencias interculturales en estudiantes de español como lengua extranjera. Se examinan las relaciones entre el texto y el contexto de un pregón entonado en las calles de Cartagena (Colombia), para aportar indicios que permitan comprender los modos de negociar en el caribe colombiano. El análisis se realiza a partir del enfoque basado en géneros textuales (Feez y Joyce, 2002; Eggins, 1994) y las dimensiones propuestas por Hall (1976) para evaluar culturas nacionales y con ello facilitar la comunicación intercultural. Las primeras conclusiones muestran que el conocimiento del contexto de situación es lo único que permite recuperar significados. Respecto al contexto de cultura se muestra que la cartagenera es una sociedad de contexto alto, afincada en actitudes y tradiciones duraderas, en el uso de múltiples formas de comunicación y en la negociación de significados implícitos en las relaciones y las situaciones.
Różnice leksykalne w wypowiedziach zwolenników i przeciwników dopuszczalności aborcji - analiza anglojęzycznych grup w serwisie Facebook
Authors: Ćwierz Klaudia , Cossengue Casimiro Ramona , Konat Barbara
Published: July 2018

Celem niniejszego artykułu jest empiryczne ustalenie różnic leksykalnych w grupach dyskusyjnych reprezentujących odmienne postawy względem aborcji. Chcemy pokazać, w jaki sposób grupy te stosują odmienny opis świata, poprzez wybór odmiennego słownictwa. Materiał został zebrany w grupach dyskusyjnych na portalu społecznościowym Facebook, a analiza została przeprowadzona metodami statystycznymi w postaci uczenia maszynowego z wykorzystaniem klasyfikatorów bazujących na zestawach cech “bag of words” oraz “n-gram”. Zastosowano także jakościową analizę słów kluczowych.
Chińskie zwyczaje pogrzebowe: powtórny pochówek
Authors: Muchowska Joanna
Published: July 2018

The article is devoted to the Chinese death ritual of a secondary burial in its traditional form, known from ancient written sources. It depicts its origin and the most important practices associated with it. The article is based on the BA thesis “Funerary customs in China and Taiwan: secondary burial”, written by the author under the supervision of dr. Marcin Jacobi in the Department of Chinese Language at Warsaw University in 2013.
Odwołanie do fonologii w procesie dzielenia na sylaby wyrazów ortograficznych języka polskiego
Authors: Śledziński Daniel
Published: July 2018

W artykule omówiono wybrane zagadnienia związane z procesem automatycznego dzielenia na sylaby tekstów ortograficznych w języku polskim. Przy projektowaniu systemu sylabifikującego uwzględniono kilka istotnych czynników: zasady fonologiczne,odczucia subiektywne, strukturęmorfologiczna wyrazów. Zasady fonologiczne – przede wszystkim zasada sonorności – odnosi się do fonetycznej definicji sylaby. W niniejszej publikacji skoncentrowano się na aspektach działania systemu związanych z odwoływaniem się do zasad fonologicznych. Te zasady odnoszą się do wewnątrzwyrazowych grup spółgłoskowych, które są wyznaczane na podstawie informacji o lokalizacji liter odpowiadających ośrodkom sylab. To zadanie jest nieco utrudnione faktem, że w języku polskim niektóre litery, które zazwyczaj oznaczają samogłoski, w określonym kontekście oznaczają spółgłoski. W artykule omówiono również metodę przesłaniania podziału wynikającego z fonologii. Można stosować reguły które odnoszą się do odczucia subiektywnego i podział z niego wynikający różni się od podziału wynikającego z fonologii.
Set similarity joins on mapreduce
Authors: Fier Fabian , Augsten Nikolaus , Bouros Panagiotis , Leser Ulf , Freytag Johann-Christoph
Published: July 2018

Set similarity joins, which compute pairs of similar sets, constitute an important operator primitive in a variety of applications, including applications that must process large amounts of data. To handle these data volumes, several distributed set similarity join algorithms have been proposed. Unfortunately, little is known about the relative performance, strengths and weaknesses of these techniques. Previous comparisons are limited to a small subset of relevant algorithms, and the large differences in the various test setups make it hard to draw overall conclusions.

In this paper we survey ten recent, distributed set similarity join algorithms, all based on the MapReduce paradigm. We empirically compare the algorithms in a uniform test environment on twelve datasets that expose different characteristics and represent a broad range of applications. Our experiments yield a surprising result: All algorithms in our test fail to scale for at least one dataset and are sensitive to long sets, frequent set elements, low similarity thresholds, or a combination thereof. Interestingly, some algorithms even fail to handle the small datasets that can easily be processed in a non-distributed setting. Our analytic investigation of the algorithms pinpoints the reasons for the poor performance and targeted experiments confirm our analytic findings. Based on our investigation, we suggest directions for future research in the area.
Transform-data-by-example (TDE)
Authors: He Yeye , Chu Xu , Ganjam Kris , Zheng Yudian , Narasayya Vivek , Chaudhuri Surajit
Published: July 2018

Today, business analysts and data scientists increasingly need to clean, standardize and transform diverse data sets, such as name, address, date time, and phone number, before they can perform analysis. This process of data transformation is an important part of data preparation, and is known to be difficult and time-consuming for end-users.

Traditionally, developers have dealt with these longstanding transformation problems using custom code libraries. They have built vast varieties of custom logic for name parsing and address standardization, etc., and shared their source code in places like GitHub. Data transformation would be a lot easier for end-users if they can discover and reuse such existing transformation logic.

We developed
Transform-Data-by-Example
(
TDE
), which works like a search engine for data transformations.
TDE
"indexes" vast varieties of transformation logic in source code, DLLs, web services and mapping tables, so that users only need to provide a few input/output examples to demonstrate a desired transformation, and
TDE
can interactively find relevant functions to synthesize new programs consistent with all examples. Using an index of 50K functions crawled from GitHub and Stackoverflow,
TDE
can already handle many common transformations not currently supported by existing systems. On a benchmark with over 200 transformation tasks,
TDE
generates correct transformations for 72% tasks, which is considerably better than other systems evaluated. A beta version of
TDE
for Microsoft Excel is available via Office store
1
. Part of the
TDE
technology also ships in Microsoft Power BI.
A coefficient-free and continuous blood pressure estimation method based on the arterial lumen area model
Authors: Ma Song , Wang Guan , Li Liubin , Cheng Yuhua
Published: July 2018

Oscillometry is the most popular technique for automatic blood pressure (BP) estimation. This method relies on recording the cuff deflation curve (CDC) from a high suprasystolic BP (SSBP) to a low subdiastolic BP (SDBP) and is very sensitive to noise caused by breathing, motion artifacts, muscle contraction and the environment. We developed a unified BP estimation method involving two integrated sub-procedures based on the arterial lumen area (ALA) model and applied it for continuous BP measurement. Our proposed method is coefficient free and continuous. No empirical coefficients are applied, and the CDC varies within a low-pressure range of 40–80 mm Hg, which can be sustainably imposed on our wrists. The first sub-procedure estimates the mean arterial pressure (MAP) and arterial compliance parameter b under a complete CDC period. In the second sub-procedure, the systolic BP (SBP) and diastolic BP (DBP) are estimated based on the dynamic-updated oscillometric waveform. We applied this method on 300 continuously oscillometric traces recorded from 20 male and female healthy subjects aged 20–60 years. The validated results were compared with those from a double stethoscope check. We observed mean absolute errors of 4.77 and 4.24 mm Hg in estimating the SBP and DBP, respectively.