bluuebunny/crossref_metadata_2025_split huggingface dataset:
Explicit Half Range Cosine Fourier Series Expansion for Z Factor
Authors: Kareem Lateef A. 
Published: July 2013

Abstract
All natural gas processes, including production, sweetening, drying, transportation, storage, metering and selling requires that we possess ability to predict with great accuracy its volume, pressure, temperature, specific heat capacity etc. Unlike an ideal gas, a real gas does not expand and contract according the simple pressure-volume-temperature relation.
This deviation from the ideal gas behavior is corrected with the use of z-factor. Z factor is simply the ratio of the volume of a real gas to that which equal mass of an ideal gas will occupy under the same condition. Several computational methods of obtaining this factor have been developed, but the implicit nature of these correlations called for an explicit method of evaluating the multivariate parameter.
In this paper, over 6000 data points prepared by careful laboratory measurement of behavior of natural gas mixture is used to develop the model. The result was found to match the result to a very high accuracy without over fitting.
A Risk Based Model to Quantify Differential Sticking Risk in Drilling Depleted Reservoir Formations
Authors: Okwu Alaekwe Ewelike , Dosunmu Adewale 
Published: July 2013

Abstract
Given the mature phase that the industry is in, companies can no longer afford a haphazard approach to operational risk. Risk must be quantified to assure that a proper return is being paid for it. And one drilling operational risk that must be quantified is differential sticking owing to the loss that this problem has cost the industry over the years. The loss is ever increasing as the industry is forced to access depleted reservoir formations that expose her greatly to the differential sticking problem in her bid to increase hydrocarbon recovery.
This study seeks to quantify (give a sense of magnitude) to the risk of being differentially stuck in drilling a depleted reservoir formation. This is project seeks to identify drilling parameters that contribute to differential sticking which can be engineered to provide drilling conditions that will always allow a high probability (P90) of being able to pull free in case of differential sticking
A deterministic model is built first then a stochastic model is obtained from the deterministic model to incorporate the uncertainties surrounding most of the modeled variables. The stochastic model is built and run with risk analysis software @RISK. Sensitivity analysis is carried on the key variables contributing to the sticking force to ascertain the degree to which each one has contributed to the resultant sticking force. The modeled variables include: BHA and Drillstring Design, Mud Design and Mud Cake Morphology, Formation Characteristics and Drag and wellbore geometry. The model was tested by applying it to 3 wells drilled onshore Niger Delta.
The built model both deterministic and stochastic predicted accurately the occurrence of severe differential sticking in well #1 and 2 and also predicted minimal differential sticking in well #3 and this is conformity with the field experiences in drilling these wells. The sensitivity analysis showed that the variables affecting differential sticking are mud cake thickness, length of embedded pipe mud weight and sticking coefficient.
It is of paramount importance to quantify the differential sticking risk of drilling a depleted reservoir formation. The model developed can with a good degree of accuracy quantify this risk and through sensitivity analysis identify variables that should be adjusted to reduce this risk to an acceptable limit of (P10).
Structure and Mechanical Properties of Al-Li Alloys as Cast
Authors: Augustyn-Pieniążek J. , Adrian H. , Rzadkosz S. , Choroszyński M. 
Published: July 2013

Abstract
The high mechanical properties of the Al-Li-X alloys contribute to their increasingly broad application in aeronautics, as an alternative for the aluminium alloys, which have been used so far. The aluminium-lithium alloys have a lower specific gravity, a higher nucleation and crack spread resistance, a higher Young’s module and they characterize in a high crack resistance at lower temperatures. The aim of the research planned in this work was to design an aluminium alloy with a content of lithium and other alloy elements. The research included the creation of a laboratorial melt, the microstructure analysis with the use of light microscopy, the application of X-ray methods to identify the phases existing in the alloy, and the microhardness test.
The Influence of Benzoyl Peroxide on Gelation Rate of Silica Binder for Precision Casting
Authors: Nadolski M. , Konopka Z. , Łągiewka M. , Zyska A. 
Published: July 2013

Abstract
Substituting of ethyl silicate with ecologic sols of colloidal silica in the investment casting technology, resulting from the increased demands concerning environmental protection, caused the prolongation of production cycle for precision castings produced in multi-layer thin-walled ceramic shell moulds. Modification of Sizol 030 binder with benzoyl peroxide, proposed in the paper, was aimed at restriction of time needed for realization of a single layer of the shell mould, and by the same, of such a mould as a whole. Examination of kinetics of the drying process were held for the layers made of prepared moulding material and the influence of binder modification on the mould curing time was determined.
Effects of Fungicide and Acetylsalicylic Acid Treatments on the Physiological and Enzymatic Activity in Tomato (Lycopersicon Esculentum Mill.)
Authors: Horotan Aurelia , Oancea Simona 
Published: July 2013

Abstract
The paper deals with investigation of growth parameters of vegetative organs, peroxidase and catalase activities of Lycopersicon esculentum Mill. treated with a systemic fungicide and acetylsalicylic acid, respectively. Our results showed that both fungicide and acetylsalicylic acid lead to growth delays in tomato stems and leaves compared to control samples. During the growth, pathogen was rapidly inhibited by tomatoes treated with acetylsalicylic acid, affecting few plants (10%) compared to control group (40%). Results showed that samples treated with acetylsalicylic acid and control samples fructified better (30% higher) than tomatoes treated with fungicide. The latter did not suffer pathogen attack, but catalase activity was increased (107 mg H2O2/100 g FW) indicating oxidative stress. Activity of catalase and peroxidase in control and acetylsalicylic acid treated plants were of similar increased values, probably due to the pathogen infection. In particular, peroxidase activity increased during tomato fructification. Alternative substitution of fungicides with aspirin may improve tomato quality and production.
Effect of the soil water content on Jatropha seedlings in a tropical climate
Authors: Pérez-Vázquez A. , Hernández-Salinas G. , Ávila-Reséndiz C. , Valdés-Rodríguez O.A. , Gallardo-López F. , García-Pérez E. , Ruiz-Rosado O. 
Published: July 2013

Abstract
The purpose of this study was to evaluate growth, chlorophyll content, and photosynthesis in Jatropha at different levels of soil moisture. Plants were cultivated in containers and the treatments of the soil water content evaluated were: 0% (without watering), 20, 40, 60, and 80% soil water content. Plant height was statistically similar for all treatments, but the number of leaves differed significantly. Total dry matter and chlorophyll at 40, 60, and 80% soil water content were statistically similar, but different from 0 and 20% soil water content. Leaf area at 40, 60, and 80% soil water content was statistically different from 0 and 20% soil water content. The photosynthetic rate, transpiration and stomatal conductance at 60 and 80% soil water content were statistically similar but different from 0 and 20% soil water content. Water stress affected growth, chlorophyll content, photosynthetic rate, transpiration, and stomatal conductance.
Effect of Nanosilver on Physiological Performance of Pelargonium Plants Exposed to Dark Storage
Authors: Hatami Mehrnaz , Ghorbanpour Mansour 
Published: July 2013

Abstract
This investigation was conducted to evaluate the effects of post-harvest application of silver nanoparticles (N-Ag) and dark storage on plastid pigments, petal abscission, lipid peroxidation and activities of ascorbate peroxidase (APX) and guaiacol peroxidase (POD) in pelargonium cultivars ‘Blue Wonder’ and ‘Anthony’. N-Ag was applied as foliar spray in concentrations 0, 20, 40, 60 and 80 mg·cm-3 and then the plants were stored for 5 days in a growth chamber in darkness at temperature 20±2 °C and relative humidity 65%. The results revealed that after dark storage the petal abscission of cv. ‘Blue Wonder’ increased up to 40% but significantly decreased in plants treated with 60 mg·cm-3 of N-Ag. Cultivar ‘Anthony’ showed lesser petal abscission than ‘Blue Wonder’, namely 25% in control and 4% after treatment with 60 mg·cm-3 N-Ag. In both cultivars, treatment with N-Ag resulted in higher contents of leaf chlorophylls and carotenoids in comparison to untreated control. In response to treatments with 20-60 mg·cm-3 N-Ag, the activity of APX and POD was higher at the end of 5 days storage period than in the control plants, which coincided with improved post-harvest performance of both pelargonium cultivars. The enhancement of enzyme activities indicated possible beneficial effect of the applied treatment on alleviation of dark storage-induced oxidative stress. Also, in both cultivars, MDA content decreased significantly with the increase of N-Ag concentration up to 60 mg·cm-3 and then a rapid increase at 80 mg·cm-3 followed. It is concluded that treatment with silver nanoparticles is effective for preventing dark storage-induced petal abscission of pelargonium.
Growth and Development of Potted Rhododendron Cultivars ‘Catawbiense Boursault’ and ‘Old Port’ in Response to Regulated Deficit Irrigation
Authors: Koniarski Michał , Matysiak Bożena 
Published: July 2013

Abstract
The aim of this study was to analyse the effect of regulated deficit irrigation (RDI) on growth and development of potted rhododendron ‘Catawbiense Boursault’ and ‘Old Port’ plants and to evaluate the usefulness of this technique for saving water in nursery production and promoting flowering. Plants were grown in 1.9 litre plastic containers in unheated greenhouse and were subjected to six irrigation treatments lasting for 14 weeks from June to mid-September. A drip irrigation system with one 2 dm3·h-1 emitter per container was used. Six treatments of irrigation were applied: T1) 1 ETp (evapotranspiration) (control, well watered plants); T2) 0.75 ETp (moderate deficit irrigation); T3) 0.5 ETp (strong deficit irrigation) during the entire period of the experiment and the others three were: T4) 1 ETp for 5 weeks followed by 0.5 ETp for 4 weeks and 1 ETp for 5 weeks (strong deficit irrigation in phase II); T5) 1 ETp for 5 weeks followed by 0.25 ETp for 4 weeks and 1 ETp for 5 weeks (very strong deficit irrigation in phase II) and T6) 0.5 ETp for 5 weeks followed by 1 ETp for 4 weeks and 0.5 ETp for 5 weeks (strong deficit irrigation in phases I and III and well watered plants in phase II). The results showed that exposing plants to moderate water deficit (0.75 ETp) for 14 weeks had the best effect on quality of Rhododendron ‘Old Port’ plants. In this cultivar the application of very strong water deficit (0.25 ETp) for 4 weeks during floral buds initiation improved significantly floral bud set. Reduction of water supply by 50% during 14 weeks of Rhododendron ‘Catawbiense Boursault’ cultivation resulted in both the enhanced plant quality and increased number of floral buds set. Rhododendrons has adapted to reduced water supplies through stomatal control. At the end of the experiment, chlorophyll fluorescence parameter Fv/Fm (quantum efficiency of photosystem II) did not indicate damage to photosynthetic apparatus and relative chlorophyll content in leaves of plants subjected to all irrigation regimes did not differ significantly between each other.
Nutritional Evaluation of Five African Indigenous Vegetables
Authors: Kamga R. Tchientche , Kouamé C. , Atangana A. R. , Chagomoka T. , Ndango R. 
Published: July 2013

Abstract
The promotion and consumption of indigenous vegetables could help mitigate food insecurity and alleviate malnutrition in developing countries. In this respect, 17 accessions (candidate breeding lines that have not yet officially been released) of five African indigenous vegetables: amaranth (Amaranthus cruentus), nightshade (Solanum scabrum), African eggplant (Solanum aethiopicum), jute mallow (Corchorus olitorius) and okra (Abelmoschus callei), previously selected for their superior agronomic and horticultural traits, were evaluated in Cameroon for minerals (Ca, Mg, K, P, Zn and Fe), proteins, and carotenoids content. Nutrient content differed significantly (P<0.001) between cultivars. Amaranth (especially line AM-NKgn) had the highest Ca, Mg, and Zn content in comparison to other genotypes studied. Nightshade had the highest K and Fe content. The highest K and Fe levels were found in nightshades BG24 and SS52, respectively. Nightshade had the highest level of protein, especially line BFS1. The highest amount of carotenoids was identified in the eggplant variety Oforiwa. The study revealed that these vegetables are important sources of some vital nutrients. Increased production and consumption of these nutrient-rich vegetables will help reduce the nutrition-related disorders in Africa.
Transport of biogenes in the Szeszupa fluvial-limnic system in the Suwalski Landscape Park
Authors: Jekatierynczuk-Rudczyk Elżbieta 
Published: July 2013

AbstractTransport of biogenic matter along the course of the Szeszupa River in the Suwalski Landscape Park (SLP) occurs in accordance with the river continuum concept. Only TP concentration decreases along the river’s course. TP and TOC concentrations classify the Szeszupa River to the moderate ecological state. The ecological state of three lakes (Linówek, Pogorzałek, and Perty) in the Szeszupa River catchment was estimated as very good. The remaining lakes, due to high TP concentrations, belong to the moderate state. The management of the catchment affects the amount of biogenic matter supplied to the Szeszupa River. The highest proportion of forests in the Jaczniówka River catchment clearly results in a decrease in the amount of biogenes in the river. The remaining partial catchments, with a higher proportion of arable land, meadows, and pastures, provide higher amounts of bioelements. The loads of bioelements stored in lakes in the summer period are determined by the size of the lakes (surface area of a lake and volume of water accumulated in the lake basin). This directly suggests a lack of anthropogenic activity in the catchments or the very slight effect of it on the lakes’ ecological and trophic state.
Internet Availability as an Indicator of Peripherality in Slovakia
Authors: Rosina Konštantín , Hurbánek Pavol 
Published: July 2013

Abstract
A method employing different data sources in the construction of indices that quantify internet availability is developed in this article, and it is applied at municipality and regional levels in Slovakia. The indices are subsequently correlated with other indicators commonly used to delineate peripheral areas, in order to evaluate factors which might influence (or be influenced by) the spatial distribution of internet availability. The results show that the information-communication technology side of spatial polarization generates similar patterns as the other more traditional aspects
Renegotiating Online News
Authors: Frey Elsebeth 
Published: July 2013

Abstract
Online journalism is negotiated and renegotiated in the newsroom of Journalen, the training website for students in journalism at Oslo and Akershus University College of Applied Sciences. Using quantitative and qualitative methods, the paper examines three spring terms of online news production by journalism students, particularly looking at sources, links and their multimedia news production. The findings are compared to the students’ professional peers in four news sites in the same period. All five sites are moving towards a convergent news modality. But the students tend to use more sources than their professional peers.
The Situation of National and Regional Public Television in Spain
Authors: Ibarra Karen Arriaza 
Published: July 2013

Abstract
Spain’s Public National Television (TVE) faces the uncertainty of defining its role as the main public broadcaster at a moment when neither the economic situation of the country nor the waning satisfaction with the citizens with TVE, make things any easier. Furthermore, the government announcement of TVE’s withdrawal of advertising in 2009 was widely commented, as there has never been any license fee in support of Spanish public media.
On the other hand, the economic crisis that Spain is going through has posed the issue on the need of cutting down governmental expenditures on the desk of Prime Minister Mariano Rajoy. Will these also include TVE, as it has happened with public regional media? Will Spanish citizens admit the importance of improving TVE now that two gigantic commercial media groups, Mediaset and Planeta, dominate the audiovisual landscape?
Integrating truck arrival management into tactical operation planning at container terminals
Authors: Yang Zhong-Zhen , Chen Gang , Song Dong-Ping 
Published: July 2013

Abstract
Truck arrival management (TAM) has been recognized as an effective solution to alleviate the gate congestion at container terminals. To further utilize TAM in improving the overall terminal performance, this study integrates TAM with the other terminal operations at a tactical level. An integrated planning model and a sequential planning model are presented to coordinate the major terminal planning activities, including quayside berth allocation, yard storage space allocation and TAM. A heuristic-based genetic algorithm is developed to solve the models. A range of numerical examinations are performed to compare two planning models. The result shows that: the integrated model can improve the terminal performance significantly from the sequential model alone, particularly when the gate capacity and the yard capacity are relatively low; whereas the sequential model is more efficient than the integrated model in terms of computational time.
A new planning model to support logistics service providers in selecting mode, route, and terminal location
Authors: Huynh Nathan , Fotuhi Fateme 
Published: July 2013

Abstract
In this paper, we address thefreight network design problem. A mixed integer linear program is formulated to help logistics service providers jointlyselect the best terminal locations among a set of candidate locations, shipping modes, and route for shipping different types of commodities. The developed model isapplied to two different networksto show its applicability. Results obtained from CPLEX for the case studiesare presented, and the benefit of the proposed model is discussed
Consequence of the introduction of routine FCH PET/CT imaging for patients with prostate cancer: a dual centre survey
Authors: Hodolic Marina , Michaud Laure , Huchet Virginie , Balogova Sona , Nataf Valérie , Kerrou Khaldoun , Vereb Marika , Fettich Jure , Talbot Jean-Noël 
Published: July 2013

Abstract
Background. Fluorocholine(18F) (FCH) was introduced at the beginning of April 2010 in France, Slovenia and three other EU member states for the localisation of bone metastases of prostate cancer with PET. The aim of the study was to compare the evolution of diagnostic imaging in patients with prostate cancer using a new radiopharmaceutical FCH, observed in France and in Slovenia, and to quantify the consequence of the results of new imaging modality on the detection rate of abnormal metastases and recurrences of prostate cancer.
Patients and methods. In two centres (France/Slovenia), a survey of the number of nuclear medicine examinations in patients with prostate cancer was performed, covering 5 quarters of the year since the introduction of FCH. For each examination, the clinical and biological circumstances were recorded, as well as the detection of bone or soft tissue foci.
Results. Six hundred and eighty-eight nuclear medicine examinations were performed impatients with prostate cancer. Nuclear medicine examinations were performed for therapy monitoring and follow-up in 23% of cases. The number of FCH PET/CT grew rapidly between the 1st and 5th period of the observation (+220%), while the number of bone scintigraphies (BS) and fluoride(18F) PET/CTs decreased (-42% and -23% respectively). Fluorodeoxyglucose(18F) (FDG) PET/CT remained limited to few cases of castrate-resistant or metastatic prostate cancer in Paris. The proportion of negative results was significantly lower with FCH PET/CT (14%) than with BS (49%) or fluoride(18F) PET/CT (54%). For bone metastases, the detection rate was similar, but FCH PET/CT was performed on average at lower prostate-specific antigen (PSA) levels and was less frequently doubtful (4% vs. 28% for BS). FCH PET/CT also showed foci in prostatic bed (53% of cases) or in soft tissue (35% of cases).
Conclusions. A rapid development of FCH PET/CT was observed in both centres and led to a higher detection rate of prostate cancer lesions.
Gödel-type spacetimes in f(R)-gravity
Authors: Saltı Mustafa , Korunur Murat , Açıkgöz İrfan 
Published: July 2013

AbstractWe focus on one of the famous problems in theoretical physics today: the problem of energy-momentum localization. Although many authors have endeavoured to solve this problem, it has remained unsolved until now. In this work, we consider the generalized version of the Landau-Lifshitz definition in f(R)-Gravity to discuss the energy-momentum localization problem in Gödel-type metrics. We also take into account five popular f(R) models to obtain specific results.
Fundamental solutions to time-fractional heat conduction equations in two joint half-lines
Authors: Povstenko Yuriy 
Published: July 2013

Abstract
Heat conduction in two joint half-lines is considered under the condition of perfect contact, i.e. when the temperatures at the contact point and the heat fluxes through the contact point are the same for both regions. The heat conduction in one half-line is described by the equation with the Caputo time-fractional derivative of order α, whereas heat conduction in another half-line is described by the equation with the time derivative of order β. The fundamental solutions to the first and second Cauchy problems as well as to the source problem are obtained using the Laplace transform with respect to time and the cos-Fourier transform with respect to the spatial coordinate. The fundamental solutions are expressed in terms of the Mittag-Leffler function and the Mainardi function.