bluuebunny/crossref_metadata_2025_split huggingface dataset:
Assessment of the environmental quality of two urbanized lotic systems using multiple indicators
Authors: Calderon M. R. , Moglia M. M. , Nievas R. P. , Colombetti P. L. , González S. P. , Jofré M. B. 
Published: May 2017

AbstractUrbanization impacts ecosystems through loss and fragmentation of habitat, loss of diversity, increase in runoff, and contaminant discharges, and the invasion of exotic species. Potrero de los Funes Village (San Luis, Argentina) is experiencing not only a population increase during summer months due to tourism but also an accelerated growth of its permanent population. In order to evaluate the potential effects of urbanization, the environmental quality of Potrero de los Funes River and Las Chacras Stream was assessed, using physical–chemical and biological indicators. Macroinvertebrates, through the application of the Biotic Index for San Luis Sierras (BISLS), anuran amphibian richness and relative abundance, and riparian vegetation were used as bioindicators. While the Simplified Index of Water Quality (SIWQ) was used to characterize the physical–chemical quality of water at each site. SIWQ and BISLS scores were significantly different between sites (F7,28 = 9.88, p < .001 and F7,28 = 24.18, p < .001, respectively). SIWQ was significantly correlated with BISLS (Spearman correlation coefficient = 0.8, p < .001). Four anuran species were registered along Potrero River, with no significant differences in the intensity of vocalizations between sites. No species were detected in Las Chacras Stream. Average total plant species richness, exotic plants richness, and vegetation cover were higher at the most impaired system, Las Chacras Stream. The principal component analysis showed that the first two principal components (PCs) explained 76.3% of the total variance. PC1, with strong loadings of SIWQ, BISLS, and amphibian richness, was principally driven by chemical water quality and biological conditions. PC2 was mainly determined by plant richness. The chemical and biological water quality of Potrero and Las Chacras is somewhat impaired, being the upper Las Chacras Stream the most compromised area. This study provides information that will certainly be used to manage future impacts of urbanization on aquatic resources.
“Can There be a Full Moon at Daytime?” Young Students Making Sense of Illustrations of the Lunar Phases
Authors: Åberg‐Bengtsson Lisbeth , Karlsson Karl Göran , Ottosson Torgny 
Published: May 2017

ABSTRACTTeaching and learning situations nowadays typically build on richly illustrated material or multimodal presentations. Under these circumstances, the transparency of images and models used for explaining various phenomena becomes central. The present study deals with 20 Swedish children, 9–12 years old, discussing an illustration meant to show the cause of the different appearances of the Moon in the sky. The students’ task was to place eight numbered moon phases in the lunar orbit in the image. The illustration in question was chosen (a) because it was of a kind frequently used to explain the lunar phases and (b) because the phenomenon is known to be difficult to understand for students of all ages. The analysis leans on historical and sociocultural approaches as well as on multimodal semiotics. The results show that a majority of students were able to make sense of the most central features of the illustration but that very few spontaneously reasoned in a way that could be interpreted as the intended meaning‐making of the cause of the lunar phases. The results also indicate that the simultaneous adoption of two perspectives necessary for understanding the phenomenon was a stumbling block for most of the students.
Genetic Rescue of Mitochondrial and Skeletal Muscle Impairment in an Induced Pluripotent Stem Cells Model of Coenzyme Q10 Deficiency
Authors: Romero-Moya Damià , Santos-Ocaña Carlos , Castaño Julio , Garrabou Gloria , Rodríguez-Gómez José A. , Ruiz-Bonilla Vanesa , Bueno Clara , González-Rodríguez Patricia , Giorgetti Alessandra , Perdiguero Eusebio , Prieto Cristina , Moren-Nuñez Constanza , Fernández-Ayala Daniel J. , Victoria Cascajo Maria , Velasco Iván , Canals Josep Maria , Montero Raquel , Yubero Delia , Jou Cristina , López-Barneo José , Cardellach Francesc , Muñoz-Cánoves Pura , Artuch Rafael , Navas Plácido , Menendez Pablo 
Published: May 2017

Abstract
Coenzyme Q10 (CoQ10) plays a crucial role in mitochondria as an electron carrier within the mitochondrial respiratory chain (MRC) and is an essential antioxidant. Mutations in genes responsible for CoQ10 biosynthesis (COQ genes) cause primary CoQ10 deficiency, a rare and heterogeneous mitochondrial disorder with no clear genotype–phenotype association, mainly affecting tissues with high-energy demand including brain and skeletal muscle (SkM). Here, we report a four-year-old girl diagnosed with minor mental retardation and lethal rhabdomyolysis harboring a heterozygous mutation (c.483G &gt; C (E161D)) in COQ4. The patient’s fibroblasts showed a decrease in [CoQ10], CoQ10 biosynthesis, MRC activity affecting complexes I/II + III, and respiration defects. Bona fide induced pluripotent stem cell (iPSCs) lines carrying the COQ4 mutation (CQ4-iPSCs) were generated, characterized and genetically edited using the CRISPR-Cas9 system (CQ4ed-iPSCs). Extensive differentiation and metabolic assays of control-iPSCs, CQ4-iPSCs and CQ4ed-iPSCs demonstrated a genotype association, reproducing the disease phenotype. The COQ4 mutation in iPSC was associated with CoQ10 deficiency, metabolic dysfunction, and respiration defects. iPSC differentiation into SkM was compromised, and the resulting SkM also displayed respiration defects. Remarkably, iPSC differentiation in dopaminergic or motor neurons was unaffected. This study offers an unprecedented iPSC model recapitulating CoQ10 deficiency-associated functional and metabolic phenotypes caused by COQ4 mutation.
Shrinkage and creep behavior of an alkali‐activated slag concrete
Authors: Ma Jianxin , Dehn Frank 
Published: May 2017

In this paper, experimental results about the shrinkage and creep behavior of an alkali‐activated slag concrete (AAS‐concrete) are presented. The autogenous shrinkage of AAS‐concrete is pronounced at a relatively high water to binder ratio of 0.41. The ultimate value of autogenous shrinkage is determined to be higher than that of high‐strength concrete (HSC). The observed self‐desiccation at a later concrete age can be one of the reasons for the autogenous shrinkage. In a drying environment of 65% relative humidity AAS‐concrete exhibits a significantly higher total shrinkage compared to normal‐strength concrete composed of Portland cement.In the contrary to normal and HSC carbonation shrinkage must not be neglected for AAS‐concrete in the early concrete age. The sum of drying and carbonation shrinkage develops much more rapidly for AAS‐concrete in the first weeks after the beginning of drying. Based on the experimental results the shrinkage behavior of AAS‐concrete cannot be predicted by conventional models. The creep behavior of the AAS‐concrete was investigated under sealed and unsealed conditions. The creep coefficients for both conditions are higher than those calculated when using conventional models.
Improved fixed point iterative method for blade element momentum computations
Authors: Sun Zhenye , Shen Wen Zhong , Chen Jin , Zhu Wei Jun 
Published: May 2017

AbstractThe blade element momentum (BEM) theory is widely used in aerodynamic performance calculations and optimization applications for wind turbines. The fixed point iterative method is the most commonly utilized technique to solve the BEM equations. However, this method sometimes does not converge to the physical solution, especially for the locations near the blade tip and root where the failure rate of the iterative method is high. The stability and accuracy of aerodynamic calculations and optimizations are greatly reduced due to this problem. The intrinsic mechanisms leading to convergence problems are addressed through both theoretical analysis and numerical tests. A term from the BEM equations equals to zero at a critical inflow angle is the source of the convergence problems. When the initial inflow angle is set larger than the critical inflow angle and the relaxation methodology is adopted, the convergence ability of the iterative method will be greatly enhanced. Numerical tests have been performed under different combinations of local tip speed ratio, local solidity, local twist and airfoil aerodynamic data. Results show that the simple iterative methods have a good convergence ability which will improve the aerodynamic or structural design of wind turbines. Copyright © 2017 John Wiley & Sons, Ltd.
Effects of self-attraction and loading at a regional scale: a test case for the Northwest European Shelf
Authors: Irazoqui Apecechea Maialen , Verlaan Martin , Zijl Firmijn , Le Coz Camille , Kernkamp Herman 
Published: May 2017

Abstract
The impact of the self-attraction and loading effect (SAL) in a regional 2D barotropic tidal model has been assessed, a term with acknowledged and well-understood importance for global models but omitted for boundary-forced, regional models, for which the implementation of SAL is non-trivial due to its non-local nature. In order to understand the impact of the lack of SAL effects in a regional scale, we have forced a regional model of the Northwest European Continental Shelf and the North Sea (continental shelf model (CSM)) with the SAL potential field derived from a global model (GTSM), in the form of a pressure field. Impacts have been studied in an uncalibrated setup and with only tidal forcing activated, in order to isolate effects. Additionally, the usually adopted simple SAL parameterization, in which the SAL contribution to the total tide is parameterized as a percentage of the barotropic pressure gradient (typically chosen 10%), is also implemented and compared to the results obtained with a full SAL computation. A significant impact on M2 representation is observed in the English Channel, Irish Sea and the west (UK East coast) and south (Belgian and Dutch Coast) of the North Sea, with an impact of up to 20 cm in vector difference terms. The impact of SAL translates into a consistent M2 amplitude and propagation speeds reduction throughout the domain. Results using the beta approximation, with an optimal domain-wide constant value of 1.5%, show a somewhat comparable impact in phase but opposite direction of the impact in amplitude, increasing amplitudes everywhere. In relative terms, both implementations lead to a reduction of the tidal representation error in comparison with the reference run without SAL, with the full SAL approach showing further impacted, improved results. Although the overprediction of tidal amplitudes and propagation speeds in the reference run might have additional sources like the lack of additional dissipative processes and non-considered bottom friction settings, results show an overall significant impact, most remarkable in tidal phases. After showing evidence of the SAL impact in regional models, the question of how to include this physical process in them in an efficient way arises, since SAL is a non-local effect and depends on the instantaneous water levels over the whole ocean, which is non-trivial to implement.
Adsorption and Micellization of Gemini Surfactants with Diethylammonium Headgroups: Effect of the Spacer Rigidity
Authors: Liu Zhitian , Ge Yifan , Zhang Qi , Gao Xiang , Cai Xiong , Chen Mengyao , Yu Xuechen 
Published: May 2017

AbstractA series of novel cationic gemini surfactants p‐phenylenedimethylene bis(alkyldiethylammonium) chloride (abbreviated as Gm, m is the carbon numbers of hydrophobic tails) were synthesized. Their surface properties and aggregation behavior were investigated by surface tension, electrical conductivity, steady‐state fluorescence, dynamic light scattering and transmission electron microscopy measurements, and compared with gemini surfactants with a flexible hexanediyl spacer and diethylammonium headgroups [abbreviated as CmC6Cm(Et)]. It was found that Gm reached adsorption equilibrium at the air–water interface at the critical micelle concentration, but CmC6Cm(Et) did not. The packing densities and the aggregation surface charge densities of Gm are less than that of CmC6Cm(Et). Pre‐micellar association occurs in aqueous solutions of gemini surfactants with m ≥ 14. The ability to form pre‐micellar aggregates increases with increasing the length of alkyl chain. Gemini surfactants with rigid p‐xylylene spacer are more prone to form the pre‐micellar aggregates. The rigidity of the spacer of gemini surfactants has little effect on the aggregation micropolarity sensed by pyrene. Only vesicles were found in aqueous solutions of these gemini surfactants, and Gm with p‐xylylene spacer tends to form larger vesicles which have loose structures with low surface charge density.
Correlations Between Cloud Point and Compositional Properties of Palm Oil and Liquid Fractions from Dry Fractionation
Authors: Danthine S. , Lefébure E. , Blecker C. , Dijckmans P. , Gibon V. 
Published: May 2017

AbstractDry fractionation of palm oil can be conducted as a multi‐step process; this gives rise to new softer and harder fractions having multitudes of applications in fat foods. This work focuses on the liquid fractions obtained following a triple‐step fractionation; the cloud point was measured on a set of 125 palm oil, olein, super olein and top olein samples, with the intention to correlate this value to the compositional properties. The Mettler cloud point, the diacylglycerol content, some selected single or groups of triacylglycerols and the iodine value (in total, 11 variables per sample) were measured and entered in a statistical model. A principal component analysis (PCA) was first carried out from which different sub‐groups were highlighted. In each sub‐group, various regressions (simple linear, simple non‐linear and multiple linear) were applied and 28 significant equations were derived. Out of these, one multiple linear regression involving the iodine value, the UUU and PPP contents showed the best correlation with the Mettler cloud point. This equation was selected to predict the cloud point since it was further successfully validated by using a set of 25 other independent samples. A partial least square (PLS) regression was tested and also considered adequate to predict the cloud point.
Laboratory‐Scale Optimization of Roasting Conditions Followed by Aqueous Extraction of Oil from Wild Almond
Authors: Chodar Moghadas Hooman , Rezaei Karamatollah 
Published: May 2017

AbstractThe effects of roasting and aqueous extraction conditions for oil recovery from wild almond were optimized using response surface methodology (RSM). Optimum conditions for oil extraction were obtained at 142 °C roasting temperature, 16.5 min roasting time, 5.67 extraction pH and 4.6 h extraction time. Under these conditions, the extraction yield of 34.5% (w/w, based on the original weight of the sample) was obtained, which is equivalent to 80.0% of the total oil in the kernel. This was lower than that obtained by hexane Soxhlet (HS) extraction (43.1%, w/w, considered as 100% of total oil) but higher than that of cold pressing (CP) (18.5%, w/w; i.e., 42.9% of total oil). The refractive indices and saponification values of the oils were not affected by the extraction method. However, fatty acid and tocopherol compositions and DPPH radical scavenging capacities as well as unsaponifiable matter, iodine, peroxide and acid values of the obtained oils were impacted by the extraction method. The results showed that the quality attributes (omega‐6 fatty acid content, peroxide and acid values, total tocopherol contents and antioxidant activity) of the oil obtained by AEP were somewhat similar to those of the oil extracted by CP and much superior to those of the oil obtained by HS.
Compositional Appraisal and Quality Implication of Emiworo Metacarbonate Deposit in Central Nigeria
Authors: Jimoh Onimisi A. , Ariffin Kamar S. , Hussin Hashim B. , Abdulkareem Toyin 
Published: May 2017

ABSTRACT
Metacarbonate deposit occurring in Emiworo area, northcentral Nigeria are low grade marble associated with Proterozoic basement complex rocks. Integrated inorganic geochemical, physical and thermal characteristics of the samples were investigated with the aim of revealing their economic viability. The phase characteristics of the metacarbonate show that dolomite is the dominant phase with calcite and phlogopite as minor phases, while silicates, graphites and pyrites constitute the accessories. Reactivity of the quicklime measured after calcination at different temperatures revealed that only the quicklime produced in 1 hour at 950°C and 1000°C was found to be reactive. Physical properties and comparative data show that the Emiworo marble displays lower water absorption and higher compressive strength, loss on ignition and bulk specific gravity, compared to other metacarbonate rocks occurring in other parts of Nigeria and elsewhere. These attributes makes the deposit suitable for many conventional industrial applications.
Surface Soil Assessment in the Ubhur Area, North of Jeddah, Western Saudi Arabia, Using a Multichannel Analysis of Surface Waves Method
Authors: Aldahri Maher , mogren Saad , Abdelrahman Kamal , Zahran Hani , El Hady Sherif , El-Hadidy Mahmoud 
Published: May 2017

ABSTRACT
Ten boreholes drilled in Ubhur area up to the depth of bedrock indicted the shallow depth of bedrock where the average depth ranges between 10 and 15 m. The standard penetration test N-values of these boreholes were measured and averaged. Based on N-values to the depth of bedrock, Ubhur area can be classified as site class C and D. Multichannel analysis of surface waves technique has been applied along seventy six profiles using 24-channel geophone array and 4.5Hz vertical geophones with 1m geophone spacing and sledgehammer and/or weight drop as seismic energy sources. Values of shear wave velocity to 30 m are calculated and then averaged (Vs30) where it ranges between 310.08 m/s and 1139.8 m/s. Therefore, Ubhur area can be classified into site class B, C and D based on site classification of the national earthquake hazards reduction program (NEHRP) recommendations. Accordingly, the greatest part of the study area falls in site class C while class B and D covered limited areas in the western and the eastern parts respectively. Depending on the shallow depth of bedrock in the study area, the Vs30 parameter is not applicable in the study area so the average values of Vs for the soil thickness, excluding the bedrock, have been calculated and mapped for site class C and D only. So Vs30 approach is not applicable for areas with shallow depth of bedrock which gives higher classification.
Assessment of Groundwater Quality Index for Drinking Purpose in the Durg District, Chhattisgarh Using Geographical Information System (GIS) and Multi-Criteria Decision Analysis (MCDA) Techniques
Authors: Jhariya D. C. , Kumar Tarun , Dewangan Rakesh , Pal Dharm , Dewangan Pankaj Kumar 
Published: May 2017

ABSTRACT
Present study is carried out to evaluate and characterize groundwater quality using Geographical Information System (GIS) and Multi-Criteria Decision Analysis (MCDA) Techniques. In order to ascertain the groundwater quality a detailed survey was carried-out and a total 88 numbers of groundwater samples were collected from different locations of the Durg district. Various physicochemical parameters of collected groundwater samples were analyzed for the periods of 5-years from 2007 to 2011 during pre-monsoon period. Six criteria viz. pH, calcium (Ca++), magnesium (Mg++), chloride (Cl−), nitrate (NO3–) and fluoride (F−) were used for the determination of groundwater quality index. The analytical hierarchical process (AHP) used to determine the weight of various parameters and their classes for identifying the groundwater quality index. Present study is helpful for long-term planning and management of groundwater resources of the study area.
Seismo-Stratigraphic and Structural Interpretation of Seismic Data of Titas Gas Field, Bengal Basin, Bangladesh
Authors: Sultan-Ul-Islam Md. , Islam Md. Aminul , Latif Md. Hasan , Aftabuzzaman Md. , Rahman Syed Mustafizur , Molla Md. Ismail , Shalaby Mohamed Ragab 
Published: May 2017

ABSTRACT
In the present study, seismic interpretation has been carried out over Titas structure of Bengal basin, Bangladesh to figure out its seismo-stratigraphic and structural behavior. Seven well marked reflecting horizons (R-01 to R-07) have been identified within the Neogene sedimentary sequences using 18 seismic sections and well log data. A new seismic stratigraphy of Neogene sequences has been proposed for the Titas structure ruling out the traditional lithostratigraphy. The studied structure has been divided into 3 megasequences (MS1, MS2 and MS3). Reflector R-01 and R-03 represent the tops of the megasequence 2 (MS2) and megasequence 1 (MS1) respectively. These well marked reflectors are correlated with the top of the traditional litho-groups called Tipam and Surma. Reflectors R-02 and R-04 represent acoustic impedance boundaries within MS2 and MS1 due to lithological gradation. However, R-02 and R-04 are not considered as sequence/ formation boundaries because geologically these are not well defined. Reflectors R-05, R-06 and R-07 represent top of the gas-bearing zones A, B and C that belongs to MS1. All these interfaces or reflectors are anti-form with a central long crestal zone. It forms a north-south trending semi-domal sub-surface anticlinal structure having a semi-dome shaped closure. The structure is asymmetric with steeper eastern flank and gentler western flank. The crestal region is essentially plain with discontinuous reflection. The semi-domal nature of the anticline is in contrast to the neighboring narrow anticlines. Structural pattern suggests its development in relation to the NE-SW trending stress field due to convergence of Indian plate with Burmese plate. Structures of the shallower and deeper reflectors are formed at different phases of structural development.
Research diversity in accounting doctoral education: survey results from the German-speaking countries
Authors: Pelger Christoph , Grottke Markus 
Published: May 2017

AbstractUS positivistic accounting research is increasingly perceived as having come to be the point of reference for researchers in other countries, including the German-speaking area where formerly normative research was widespread. In this paper, we present the survey results retrieved from 293 doctoral students in accounting in 2009, a period of transition in which old and new approaches to doctoral education co-existed. Specifically, doctoral students were subject to institutional change in the form of more structured doctoral studies and a focus on internationalisation and attempts to publish in academic journals. We find that at that time there was diversity with regard to both the set of accounting journals considered by doctoral students and the methods employed by the latter in their dissertations. With respect to research methods, we show that factors of the institutional setting reflecting a more structured and international approach to doctoral education are in particular linked to empirical quantitative, and to a lesser extent qualitative, research.
Subacute pneumothorax contralateral to the venous access site associated with atrial lead perforation in a patient who was receiving corticosteroid therapy
Authors: Ishizue Naruya , Kishihara Jun , Niwano Shinichi , Ako Junya 
Published: May 2017

AbstractPneumothorax contralateral to the venous access site due to the right atrial lead is an uncommon complication. Concomitant steroid use is known as a risk factor of pacemaker lead perforation. We report a rare case of subacute contralateral pneumothorax due to a screw‐in atrial lead perforation that occurred after dual‐chamber pacemaker implantation in a patient who was receiving steroid therapy. The pneumothorax disappeared, and no recurrence was observed during follow‐up with close observation alone.