bluuebunny/crossref_metadata_2025 huggingface dataset:
Methods for optimal loading of the prosumer’s heat source during the heating period
Authors: Postnikov Ivan , Penkovskii Andrey
Published: June 2019

The paper the one of current problem of transition of district heating systems (DHS) to the new type of intelligent and integrated systems. This problem is related to the implementation the technology of prosumer, which allows regulating its own heat loading ensuring the most efficiency heating modes by using its own heat sources (HS) and/or heat storages. The statement of considered problem is formulated as the search of the optimal loading relation between the own distributed HS of prosumer and the district HS of DHS, based on the criterion of minimal cost on heating to prosumer for each calculated time interval during the heating period. The practical researches based on calculating experiment using the test scheme of DHS is provided. The results of calculations are presented as diagram of prosumer’s and district HS loading for the considered DHS scheme, as well as the economic benefit when using distributed generation of prosumers.
An Algorithm for Calculating Gas Transmission System Optimal Stationary Mode
Authors: Belevitin Andrey A.
Published: June 2019

In this paper, we consider the problem of calculating the optimal stationary mode of the gas transmission system. The maximum throughput of the gas transmission system was used as optimization criterion. Presented are the problem statement and the solution procedure. The original problem is divided into two interrelated components: the MINLP problem and the temperature calculation. To solve the MINLP problem, the Successive Linear Programming (SLP) method was used in combination with the branch and boundary method applied to integer variables. Modeling of compressor shop operating modes was performed using integer variables. Described are the approaches to improving the convergence of the algorithm: the introduction of an additional optimization subcriterion and additional constraints for gas flows through GTS sections.
Efficiency increasing by development of district heating systems operational modes using graphical analysis
Authors: Tokarev Vyacheslav V. , Alekseev Aleksandr V. , Shalaginova Zoya I.
Published: June 2019

The tasks of analyzing, developing and justifying of the district heating systems (DHS) operation modes arise at different stages of their life cycle. The article provides a brief description of the tasks, steps and methods for calculating and analyzing DHS modes, which are implementing as subtasks of the "ANGARA-HN" software. Special attention is paying to the automation of analysis processes. The developed computational and graphical software tools for parameters analyzing of the DHS operating modes consists of the means: analyzing of the initial information, calculating the values of the mode parameters and analyzing results of the calculation. Various tools allow you to visualize the distribution of selected parameters values on the graphical city plan, highlight bottlenecks, building pressure distribution graphs. The developed software designed to automate the workplaces of regimes group engineers at operational enterprises or for designer workers, when developing and justifying development schemes for urban DHS. Tools for analysis and graphical visualization significantly increase the efficiency of work by reducing the time of analysis, development and justification of operating conditions, as well as improve the quality of the results.
Solar-driven Refrigerator for off-grid Regions
Authors: Kuś Jakub , Rudykh Kyrylo , Kobas Marcin , Żołądek Maciej , Sendłak Szymon , Gumułka Maciej , Sornek Krzysztof
Published: June 2019

Refrigeration systems are necessary for people living in hot climates. A majority of tropical and subtropical countries uses electrical power as a source of cooling. During the seasons of high ambient temperature there is a significant cooling load due to increased level of energy consumption. Cooling systems are therefore necessary in African countries in order to keep medications and food in safe conditions. Furthermore, there is a power shortage crisis due to the high demand for cooling. TRNSYS software allows to simulate a complete solar-powered absorption cooling system. A model used in an experiment includes PV modules making it advantageous over a conventional cooling system. PV modules of assumed area are sufficient to maintain the temperature inside cooling device below 6°C over the whole year.
Effect of Temperature on Interesterification of Rapeseed Oil with Methyl Acetate in Presence of BuOK/BuOH
Authors: Kampars Valdis , Gravins Reinis , Lazdovica Kristine , Kampare Ruta
Published: June 2019

If the interesterification reaction of rapeseed oil with methyl acetate at reactant to oil molar ratio of 18:1 in presence of potassium tert-butoxide in tert-butanol of molar ratio to oil 0.08 is conducted at a temperature of about 35 °C, reaction time for full conversion of oil is shorter than one hour, while at a temperature of 55 °C it is approximately 15 minutes. Reaction time at the desired temperature has a wide "optimal" range and cannot be an effective variable for the process optimisation. Experimental results at the temperature of 25 °C confirm the pseudo-first order of the reaction, which lowered towards the end of the reaction. The pseudo-first order rate constant was 0.63 min-1. Fuel characteristics of the interesterification reaction mixtures without purification improved with the rising of reaction temperature from 35 °C to 55 °C, however, they fail to meet the requirements of standard EN14214 for biodiesel. Methyl acetate to oil molar ratio 18:1 is too low for obtaining products with kinematic viscosity below 5.0 mm2/s.
Synthesis of Promising Cathode Material for Lithium Polymer Batteries
Authors: Smirnov Sergey , Putsylov Ivan , Fateev Sergey , Zhorin Vladimir , Kartushin Alexander
Published: June 2019

Original method for synthesis of lithium vanadium phosphate was developed. The method includes two stages: 1st, synthesis of iron phosphate from a mixture of ammonium dihydrophosphate and metal oxide; and 2st, synthesis of lithium vanadium phosphate by thermal lithiation of the product obtained in the 1st stage, with mechanical activation of the precursor in the course of plastic deformation. Our results would provide some basis for further improvement on the Li3V2(PO4)3 electrode materials for advance lithium-ion batteries.
The MUonE experiment
Authors: Marconi Umberto
Published: June 2019

The precision measurement of the anomalous magnetic moment g − 2 of the muon at present exhibits a 3.5 σ deviation between theory and experiments. In the next few years it will be measured to higher precisions at Fermilab and J-PARC. The theoretical prediction can be improved by reducing the uncertainty on the leading hadronic correction $ a_\mu ^{HLO} $ to the g − 2. Here we present a new approach to determine $ a_\mu ^{HLO} $ with space-like data, by means of a precise measurement of the hadronic contribution to the eﬀective electromagnetic coupling α, exploiting the elastic scattering of 150 GeV muons (currently available at CERN North area) on atomic electrons of a low-Z target. The direct measurement of $ a_\mu ^{HLO} $ in the space-like region will provide a new independent determination and will consolidate the theoretical prediction of the muon g − 2 in the Standard Model. It will allow therefore a firmer interpretation of the measurements of the future muon g − 2 experiments at Fermilab and J-PARC.
MEG II and Mu3e status and plan
Authors: Cattaneo Paolo W. , Schöning André
Published: June 2019

The MEG experiment searching for lepton flavor violating muon decay, finished data taking successfully in 2013. The final sensitivity of the experiment was 5.3 × 10−13, and since the experiment did not find any signal, the upper limit of the branching ratio of the µ → e+γ was set to be 4.2 × 10−13 at 90% C.L.. The MEG II experiment will have a target sensitivity improved by an order of magnitude down to 6 ×10−14 with three years data taking. In 2018 after the detector integration, the muon beam data taking took place with a limited number of readout channels. In 2019, the engineering run and the physics run will be started. The Mu3e experiment will search for the lepton flavor violating decay µ+→ e+e−e+ with unprecedented sensitivity. Construction of the detector is going to start in 2020 and for the first phase a single event sensitivity of 2 × 10−15 is expected.
XYZ at Belle
Authors: Lange Jens Sören
Published: June 2019

Recent results of exotic states with heavy quarks, denoted as XYZ states, are presented. The results include searches for the Y(4260) in B meson decays, a spin partner of Y(4630), and the strange Pentaquark $ P_s^ + $. An addition, the measurements of the absolute branching fraction of X(3872) and search for double Zc production is dicussed.
New information on the strong isospin symmetry breaking in the reactions of the a00(980) and f0(980) resonance production
Authors: Achasov N.N. , Shestakov G.N.
Published: June 2019

We discuss the isotopic symmetry breaking as a tool of studying the production mechanisms and nature of light scalar mesons. The anomalous isospin breaking effects can appear not only due to the $ a_0^0(980) - {f_0}(980) $ mixing, but also for any mechanism of the production of the $ \bar{K} $ pairs with a definite isospin in the S wave.
Dispersive analysis of the κ/K0*(700) meson and other light strange resonances
Authors: Peláez José R. , Rodas Arkaitz , Ruiz de Elvira Jacobo
Published: June 2019

We briefly review our recent works where we use dispersion relations to constrain fits to data on πK → πK and $ \pi \pi \to K\bar K $ providing a simple but consistent description of these processes. Then, simple analytic methods allow to extract parameters of poles associated to light strange resonances without assuming a particular model. We also present preliminary results on a model-independent determination of the controversial κ or $ K_0^*\left( {700} \right) $ resonance parameters, by using those constrained parameterizations as input for partial-wave hyperbolic dispersion relations that allow to perform a rigorous analytic continuation to determine its associated pole.
Study of the process e+e-→ π+π-π0η at the SND detector
Authors: Botov Alexander
Published: June 2019

The reaction e+e-→ π+π-π0η has been studied in the center-of-mass energy region below 2 GeV in the experiment with the SND detector at the VEPP-2000 e+e- collider. The reaction proceeds via the four intermediate states: ωη, $ \phi \eta $, a0(980)ρ, and a structureless π+π-π0η state, which may be, for example, ρ(1450)π state with ρ(1450) → ρ(770)η. The total e+e-→ π+π-π0η cross section and the cross section for its components, ωη, $ \phi \eta $, and a sum of a0(980)ρ and the structureless state, have been measured separately. Our results are in agreement with previous measurements and have comparable or better accuracies.
Status of R value measurement at BESIII
Authors: HU Haiming
Published: June 2019

The dominant systematic error of R value measurement comes from the hadronic generator simulations. This paper reviews the present status of R value measurement from 2.232 to 3.671 GeV at 14 energy points, especially describes the calculations of initial state radiative correction and the issue of the parameter tuning for the Lund area law generator LUARLW.
Recent results of the NA64 experiment at the CERN SPS
Authors: Kirsanov Mikhail
Published: June 2019

We report on the results of the search for a new sub-GeV vector boson (A’) mediated production of Dark Matter (χ) in the fixed-target experiment, NA64, at the CERN SPS. The A’, called dark photon, could be generated in the reaction e-Z → e-ZA’ of 100 GeV electrons dumped against an active target which is followed by the prompt invisible decay A’ $ \to \chi \bar{\chi } $. The experimental signature of this process would be an event with an isolated electron and large missing energy in the detector. From the analysis of the data sample collected in 2016 corresponding to 4.3 × 1010 electrons on target no evidence of such a process has been found. The constraints on the A’ mixing strength with photons, 10−5 ≤ ɛ ≤ 10−2, for the A’ mass range mA’ ≤ 1GeV are derived. Significantly more data were taken in 2017 and 2018. The analysis of these data is not yet finished, although the sensitivity is already estimated as about 3 times better than in the previously published result on the 2016 data.

For models considering scalar and fermionic thermal Dark Matter interacting with the visible sector through the vector portal the experiment starts to be sensitive to the regions of the dark-matter parameter $ y = \in^{2} \alpha_{D} (\frac{{m_{\chi } }}{{m_{{A^{\prime}}} }})^{4} $ predicted from the cosmological observations of Dark Matter.

We also report the improved results on a direct search for a new 16.7 MeV boson (X) which could explain the anomalous excess of e+e- pairs observed in the excited 8Be* nucleus decays. Due to its coupling to electrons, the X could be produced in the bremsstrahlung reaction e-Z → e-ZX by a beam of electrons incident on an active target in the NA64 experiment at the CERN SPS and observed through the subsequent decay into a e+e- pair. With 8.4 × 1010 electrons on target no evidence for such decays was found, allowing to set limits on the X - e- coupling in the range 1 × 10−4 ≤ ɛe ≤ 6 × 10−4 excluding part of the allowed parameter space. We also set new bounds on the mixing strength of photons with dark photons (A’) from non-observation of the decay A’ → e+e- of the bremsstrahlung A’ with a mass ≤ 23MeV.

Future plans of the NA64 experiment are presented.
Endlich läuft’s!
Authors: Jürgens Ute
Published: June 2019

Oft genug bleiben Vorhaben in der Planung stecken. Denn innere Barrieren hindern
uns, überhaupt anzufangen. Wenn Sie weder Luftschlösser bauen noch pessimistisch
verzagen, ergeben sich gangbare Wege zur Umsetzung der Wünsche. Vieles, was
früher liegenblieb, gedeiht jetzt besser.
Betriebliches Gesundheitsmanagement in der Fortbildungsakademie der Wirtschaft (FAW) gGmbH, Akademie Jena
Authors: Baumgärtel Saskia , Hamacher Vivian
Published: June 2019

Die erfolgreiche Einführung von Prozessen sowie Umsetzung von Maßnahmen des Betrieblichen Gesundheitsmanagements (BGM) stellen insbesondere Unternehmen mit dezentraler Organisation vor große Herausforderungen. Die FAW gGmbH, Akademie Jena, versucht, sich dieser Problematik über verschiedene Wege und Akteure zu nähern. Tägliche Herausforderungen bleiben dabei die Allokationsproblematik, das grundsätzliche BGM-Verständnis jedes Mitarbeitenden sowie das Sichtbarmachen von Aktivitäten rund um die Mitarbeitergesundheit.
Crohn's Disease of the Esophagus, Duodenum, and Stomach
Authors: Schwartzberg David M. , Brandstetter Stephen , Grucela Alexis L.
Published: June 2019

Upper gastrointestinal Crohn's is an under-reported, under-recognized phenotype of Crohn's disease. Routine screening in the pediatric population has shown a higher prevalence compared with adults; however, most adult patients remain asymptomatic with respect to upper gastrointestinal Crohn's disease. For the patients who are symptomatic, medical treatment is the first line of management, except for cases of obstruction, perforation, or bleeding. Though most patients respond to medical therapy, mainly steroids, with the addition of immunomodulators and more recently biologics agents, surgical intervention is usually required only for obstructing gastroduodenal disease secondary to strictures. Strictureplasty and bypass are safe operations with comparable morbidity, although bypass has higher rates of dumping syndrome and marginal ulceration in the long term. Rare cases of gastroduodenal fistulous disease from active distal disease may involve the stomach or duodenum, and esophageal Crohn's disease can fistulize to surrounding structures in the mediastinum which may require the highly morbid esophagectomy.
Association of Hyperglycemia and Final TIMI Flow with One-Year Mortality of Patients with Acute ST-Segment Elevation Myocardial Infarction Undergoing Primary PCI
Authors: Dharma Surya , Mahavira Andi , Haryono Nur , Sukmawan Renan , Dakota Iwan , Siswanto Bambang B. , Rao Sunil V.
Published: June 2019

The association of hyperglycemia at admission and final thrombolysis in myocardial infarction (TIMI) flow with 1-year mortality of patient with acute ST-segment elevation myocardial infarction (STEMI) undergoing primary percutaneous coronary intervention (PCI) has not much been explored. We evaluated the association of hyperglycemia and final TIMI flow with 1-year mortality in patients with acute STEMI who underwent primary PCI.

We retrospectively analyzed 856 patients with STEMI who underwent primary PCI in a tertiary care academic center between January 2014 and July 2016. Based on the receiver operating characteristics curve, the cutoff used for hyperglycemia in this study was greater than or equal to 169 mg/dL. Cox proportional hazard model was used to determine the association of hyperglycemia and TIMI flow with 1-year mortality.

Compared with patients with lower blood glucose level (<169 mg/dL; n = 549), a greater proportion of patients who presented with hyperglycemia (≥169 mg/dL; n = 307) had final TIMI flow 0 to 1 (3.3 vs. 0.5%; adjusted odds ratio = 5.58, 95% confidence interval [CI] 1.30–23.9, p = 0.02). Hyperglycemia was associated with an increased risk for 1-year mortality (adjusted hazard ratio [HR]= 2.0, 95% CI: 1.13–3.53, p = 0.017). Multivariable Cox regression showed that the interaction of hyperglycemia and final TIMI flow 0 to 1 was associated with an elevated risk for 1-year mortality (adjusted HR= 9.4, 95% CI: 2.34–37.81, p = 0.002).

A higher proportion of patients with acute STEMI who presented with hyperglycemia had final TIMI flow 0 to 1 after primary PCI. The interaction of hyperglycemia and final TIMI flow 0 to 1 was associated with an increased risk for 1-year mortality. This study suggests that aggressive control of hyperglycemia prior to primary PCI may facilitate better angiographic and clinical outcomes after primary PCI.

Clinical Trial Registration Clinicaltrials.gov Identifier number: NCT02319473.
Femak Start-Up Wettbewerb: Sieben Minuten für den Perfekten Pitch
Authors: Ruch Norbert
Published: June 2019

Im Rahmen der 37. femak-Bundesfachtagung in Rotenburg an der Fulda gab es einen neuen Höhepunkt im Programmablauf. Der Berufsverband für Einkäufer und Logistiker im Krankenhaus veranstaltete zum ersten Mal einen Wettbewerb für Unternehmensgründer und innovative Ideen im Gesundheitswesen. Dabei durften sich drei junge Unternehmen vorstellen, die sich im Vorfeld qualifiziert hatten.
Purely Endoscopic Resection of Cavernoma of the Septum Pellucidum
Authors: Baldo Sara , Magrini Salima , Tacconi Leonello
Published: June 2019

The intraventricular location of a cavernoma is a rare entity and accounts for approximately 2.5% of all cavernomas of the central nervous system. They are commonly found in the lateral ventricle followed by the third and fourth ventricles. The location in the septum pellucidum is rare, and only four cases have been reported in the international literature. An open craniotomy was performed in all these cases. To the best of our knowledge, this is the first case of a cavernoma of the septum pellucidum successfully resected using a purely endoscopic transventricular approach.
Oil and gas project management and success: a critical evaluation of oil and gas project management success in Australia
Authors: Ikediashi Cornelius , Bjeirmi Bassam
Published: June 2019

Australia remains in pole position to become the world’s leading exporter of liquefied natural gas (LNG) and the number one exporter in the future. Maintaining this trajectory will require the oil and gas industry in Australia to remain competitive in project delivery to continue to attract investments. Yet, the Australian project delivery environment poses a big threat to this trajectory. Several research studies, organisations and institutions have come up with a long list of generic factors contributing to project management success and failure. The aim of this study is to examine oil and gas projects in Australia with a view to ascertain their success or otherwise and the specific contributing factors. This study has used a qualitative method of research by examining secondary sources of information on four recent Western Australia LNG projects (Gorgon, Wheatstone, Prelude and Ichthys) and presenting them as case studies. Specifically, the research has used mostly online sources that are either independent reports or information sourced from company websites. The key findings suggest that major oil and gas projects in Australia fail, and that failure or success is determined by the ability of the project management team to deliver the project on budget and on schedule. This is exemplified by the projects examined in this study, which have all shown cost and schedule overruns. Six critical factors are observed as contributing to cost and schedule overrun: project location, high cost of executing projects in Australia versus overseas, skills shortages, overseas manufacturing, project complexity and cultural and environment issues. Innovation, collaboration and standardisation, as adopted from other regions, are the initial practices suggested for the Australian industry to overcome all six factors and encourage further investment.
Decommissioning – a path forward for Australia
Authors: Barrymore Stuart J. , Ballard Jane
Published: June 2019

Australia has embarked on a review of its decommissioning law and practice with a comprehensive discussion paper being issued by the Department of Industry, Innovation and Science. Initial stakeholder comments and submissions have been made, and the Department is now considering those submissions with a view to issuing recommendations to the Minister. The discussion paper ultimately proposes that new laws will be implemented to ensure that Australia has a 21st century fit-for-purpose decommissioning regime to apply to its offshore petroleum installations. After an overview of the review process and the selected issues that the Department regards of significance, this article considers a selection of the issues that emerge. It is evident that diverse views exist on almost all topics, and it will not be an easy task to find a balance that both meets the goals and aspirations of industry and community sectors. This challenge is compounded by the scale of decommissioning operations and the cost that will be incurred to remediate wells and remove associated facilities. The balance sought is one that does not stifle industry’s capacity to further invest nor impose onerous or uncompetitive imposts or controls, but also assures that adequate funding is available to carry out decommissioning works. Everyone seemingly accepts that it is not the role of the Australian Government to remove the facilities and restore the sea bed. Globally, techniques that are being increasingly utilised to manage this risk involve the imposition of securities or other assurance and enhanced statutory liability mechanisms. These legal and commercial considerations are given particular focus in the article.
Demonstrating an acceptable level of impact: an assessment of noise impacts to fishes from a seismic survey in an Australian Marine Park
Authors: Edgell Joe , Colman Jeremy , Jarvis Samantha , Glade-Wright Ollie
Published: June 2019

A key challenge of the environmental regulatory framework for offshore petroleum activities in Australia is the requirement to demonstrate acceptability, with the legislation placing the onus on petroleum titleholders to demonstrate that the impacts and risks posed by an activity will be of an acceptable level and reduced to as low as reasonably practicable. This paper presents a case study on the assessment of noise impacts to fishes for the Bethany 3D Marine Seismic Survey, which was acquired by Santos Ltd in mid-2018. The survey area was encompassed entirely by the Oceanic Shoals Marine Park, and also overlapped a significant proportion of the Timor Reef Fishery, a regionally important demersal scalefish fishery. The survey area overlapped a key ecological feature and a range of geomorphic features characterised by benthic habitats supporting demersal and benthic fish communities, including site-attached species. On this basis, the evaluation of impacts and risks required a multi-faceted approach, with seven key elements: (1) acoustic modelling; (2) application of sound exposure guidelines; (3) a quantitative risk assessment (benthic habitat predictive modelling and spatial analysis of site-attached fish assemblages); (4) the definition of an acceptable level of impact; (5) a sound source verification process; (6) engagement with key stakeholders; and (7) an independent, expert peer review process. The outcomes of each of these steps were incorporated into the environment plan, and enabled the titleholder to demonstrate that, with adopted control measures in place, environmental impacts and risks from the seismic survey could be managed to an acceptable level.
Results of hydraulic fracturing design improvements and changes in execution strategies for unconventional tight gas targets in the Cooper Basin, Australia
Authors: Johnson Jr Raymond , Zhong Ruizhi , Nguyen Lan
Published: June 2019

Tight gas stimulations in the Cooper Basin have been challenged by strike–slip to reverse stress regimes, adversely affecting the hydraulic fracturing treatment. These stress conditions increase borehole breakout and affect log and cement quality, create more tortuous pathways and near-wellbore pressure loss, and reduce fracture containment. These factors result in stimulation of lower permeability, low modulus intervals (e.g. carbonaceous shales and interbedded coals) versus targeted tight gas sands. In the Windorah Trough of the Cooper Basin, several steps have been employed in an ongoing experiment to improve hydraulic fracturing results. First, the wellbore was deviated in the maximum horizontal stress direction and perforations shot 0 to 180° phased to better align the resulting hydraulic fractures. Next, existing drilling and logging-while-drilling data were used to train a machine learning model to improve reservoir characterisation in sections with missing or poor log data. Finally, diagnostic fracture injection tests in non-pay and pay sections were targeted to specifically inform the machine learning model and better constrain permeability and stress profiles. It is envisaged that the improved well and perforation alignment and better targeting of intervals for the fracturing treatment will result in lowered tortuosity, better fracture containment, and higher concentrations of localised proppant, thereby improving conductivity and targeting of desired intervals. The authors report the process and results of their experimentation, and the results relative to the offsetting vertical well where a typical five-stage treatment was employed.
Effect of the number of water alternating CO2 injection cycles on CO2 trapping capacity
Authors: Al-Khdheeawi Emad A. , Vialle Stephanie , Barifcani Ahmed , Sarmadivaleh Mohammad , Iglauer Stefan
Published: June 2019

The CO2 storage capacity is greatly affected by CO2 injection scenario – i.e. water alternating CO2 (WACO2) injection, intermittent injection, and continuous CO2 injection – and WACO2 injection strongly improves the CO2 trapping capacity. However, the impact of the number of WACO2 injection cycles on CO2 trapping capacity is not clearly understood. Thus, we developed a 3D reservoir model to simulate WACO2 injection in deep reservoirs testing different numbers of WACO2 injection cycles (i.e. one, two, and three), and the associated CO2 trapping capacity and CO2 plume migration were predicted. For all different WACO2 injection cycle scenarios, 5000 kton of CO2 and 5000 kton of water were injected at a depth of 2275m and 2125m respectively, during a 10-year injection period. Then, a 100-year CO2 storage period was simulated. Our simulation results clearly showed, after 100 years of storage, that the number of WACO2 cycles affected the vertical CO2 leakage and the capacity of trapped CO2. The results showed that increasing the number of WACO2 cycles decreased the vertical CO2 leakage. Furthermore, a higher number of WACO2 cycles increased residual trapping, and reduced solubility trapping. Thus, the number of WACO2 cycles significantly affected CO2 storage efficiency, and higher numbers of WACO2 cycles improved CO2 storage capacity.
Variation of vertical stress in the onshore Canning Basin, Western Australia
Authors: Bailey Adam H. E. , Henson Paul
Published: June 2019

Vertical stress is one of the three principal stresses and is an important parameter in geomechanical studies that are focussed on the prediction of pore pressure, fracture gradients and wellbore stability. Variations of the vertical stress magnitude can be attributed to variations in lithology or diagenetic history, localised uplift and overpressures caused by disequilibrium compaction. This study uses wellbore data from 102 open-file petroleum wells to characterise vertical stress within the onshore Canning Basin of north-western Australia. Vertical stress magnitudes are interpreted from density logs and checkshot data and at 1 km depth below the ground surface range from 20.5 to 25.0 MPa km–1 with a mean value of 22.1 MPa km–1 (s.d. = 1.0 MPa km–1). Significant variation is evident within the calculated stress magnitudes, and when presented spatially, three regions of elevated vertical stress are identified: the Barbwire Terrace, the Devonian reef complexes of the northern Lennard Shelf and the Mowla Terrace. Lithology, abnormal pore pressures and tectonic uplift are investigated as potential mechanisms of the observed variation. Although abnormal pore pressures are identified, no direct correlation between overpressured areas and elevated vertical stress magnitudes is observed. The Canning Basin has an extensive history of uplift; however, there is little evidence for significant recent inversion. While uplift is likely to exert some influence over vertical stress magnitudes in the Canning Basin, the primary cause is interpreted to be lithological: areas of elevated vertical stress magnitude are also areas where thick intervals of carbonate sediments are present.
Experimental investigation of fluid thermal effects on fracture brittleness
Authors: RezaGholilou Alireza , Salemi Hossien , Tarom Nathan , Behnoudfar Pouria , Sarmadivaleh Mohammad
Published: June 2019

Fracture extent and formation quality are the key parameters affecting hydraulic fracturing results. Fracture brittleness, initiation and propagation are dominantly ruled by in situ stresses and rock mechanical properties which cannot be manipulated. However, operation parameters such as injection rate, viscosity and temperature of fluid can be adjusted for fracturing treatments. This paper focuses on a thermal treatment approach that affects brittleness. We investigated fractures when fluid temperature is lower than formation. Experiments were conducted using synthetic 50-mm cubic samples in a newly built true triaxial stress cell. This cell was fitted with cooling and heating auxiliary apparatus which enabled injection of fluids of various temperatures in the presence of orthogonal stresses. The samples and test records are evaluated in details to develop and upscale the results for real applications such as tight shale gas formations. Findings indicate that brittleness of material increases when considerable temperature differences exist between rock and injection fluid.
Lothar Becker: a German naturalist in Victoria, 1849–52, 1855–65
Authors: Darragh Thomas A.
Published: June 2019

Warning
Readers of this article are warned that it may contain terms, descriptions and opinions that are culturally sensitive and/or offensive to Aboriginal and Torres Strait Islanders.
Lothar Becker (1825–1901?), an unpretentious Silesian naturalist, twice visited the colony of Victoria and published rich and original observations on its natural history and Indigenous people on his return to Germany. On his first visit, 1849 to 1852, Becker recorded his encounter with Black Thursday, a devastating bushfire, its aftermath, and the, by then, still relatively uncleared landscape. He also related his experiences living for a time with an Indigenous family in the Omeo district. After adding to his store of natural history observations on a second visit, 1855 to 1865, Becker tried to make money from writing articles on diverse Australian topics such as ant nests, the sequence and timing of flowering, the distribution of weeds, the natural history of fungi and the world history of tobacco, in all but the latter characterised by a remarkable proto-ecological approach. Becker’s publications have been overlooked by subsequent scientific researchers, in part because he wrote for the popular press, and because his language was German. The life and work of Lothar Becker is introduced here for the first time, and translations provided of six of his articles on Victorian natural history, botany, mycology, horticulture, and anthropology. Reflections on Becker’s contribution to anthropology and to mycology are published in two associated articles by Howes, and May and Darragh.
格西霍爾語動詞的時與體
Authors: Tian Qianzi , Sun Jackson T.-S.
Published: June 2019

抽象

霍爾語是四川境內較少人知的語群，屬於漢藏語系羌語支嘉戎語組。本文首度詳細介紹中部霍爾語格西話動詞的時－體範疇。保守的嘉戎語組語言，動詞均採「三分式」時－體系統，一般以方向前綴區別完整體與非完整體，以不同的詞幹標記過去與非過去時。相較於這種保守的形態格局，格西話動詞的時－體系統有數項重要的創新：（一）動詞詞幹交替大幅簡化，標註時間的功能基本喪失；（二）方向前綴從體標記轉成「相對過去時」標記，可通用的相對過去前綴də-開始逐步取代其他前綴，且有聚焦於動作結果的延伸功能；（三）以贅語式造出一般非完整體及「持續體」構造。這些重要的創新既源自內部衍變的機制，也明顯受到本地主流藏語的接觸影響。
The origin and spread of Mizo gender suffixes *-a and *-i on personal
names
Authors: Bik Kenneth Van
Published: June 2019

This study presents a diachronic puzzle of the gender suffixes’ origin in Mizo personal names, -a
for male and -i for female. It also provides a plausible sociolinguistic explanation for the fast spread of its
use by the whole population, that is, the use of these gender suffixes was expedited as a result of the adoption by the well
respected missionaries.
A Spinor Approach to the SU(2) Clebsch-Gordan Coefficients*
Authors: Yang Ling-Di , Chen Fa-Min
Published: June 2019

We review the irreducible representation of an angular momentum vector operator constructed in terms of spinor algebra. We generalize the idea of spinor approach to study the coupling of the eigenstates of two independent angular momentum vector operators. Utilizing the spinor algebra, we are able to develop a simple way for calculating the SU(2) Clebsch-Gordan (CG) coefficients. The explicit expression for the SU(2) CG coefficients is worked out, and some simple physical examples are presented to illustrate the spinor approach.
Analysis on Lump, Lumpoff and Rogue Waves with Predictability to a Generalized Konopelchenko-Dubrovsky-Kaup-Kupershmidt Equation*
Authors: Liu Wen-Hao , Zhang Yu-Feng , Shi Dan-Dan
Published: June 2019

In this paper, we investigate a (2+1)-dimensional generalized Konopelchenko-Dubrovsky-Kaup-Kupershmidt equation. The lump waves, lumpoff waves, and rogue waves are presented based on the Hirota bilinear form of this equation. It is worth noting that the moving path as well as the appearance time and place of the lump waves are given. Moreover, the special rogue waves are considered when lump solution is swallowed by double solitons. Finally, the corresponding characteristics of the dynamical behavior are displayed.
Efficient Network Dismantling via Node Explosive Percolation*
Authors: Qin Shao-Meng , Ren Xiao-Long , Lü Lin-Yuan
Published: June 2019

The network dismantling problem asks the minimum separate node set of a graph whose removal will break the graph into connected components with the size not larger than the one percentage of the original graph. This problem has attracted much attention recently and a lot of algorithms have been proposed. However, most of the network dismantling algorithms mainly focus on which nodes are included in the minimum separate set but overlook how to order them for removal, which will lead to low general efficiency during the dismantling process. In this paper, we reformulate the network dismantling problem by taking the order of nodes’ removal into consideration. An efficient dismantling sequence will break the network quickly during the dismantling processes. We take the belief-propagation guided decimation (BPD) dismantling algorithm, a state-of-the-art algorithm, as an example, and employ the node explosive percolation (NEP) algorithm to reorder the early part of the dismantling sequence given by the BPD. The proposed method is denoted as the NEP-BPD algorithm (NBA) here. The numerical results on Erdös-Rényi graphs, random-regular graphs, scale-free graphs, and some real networks show the high general efficiency of NBA during the entire dismantling process. In addition, numerical computations on random graph ensembles with the size from 210
to 219
exhibit that the NBA is in the same complexity class with the BPD algorithm. It is clear that the NEP method we used to improve the general efficiency could also be applied to other dismantling algorithms, such as Min-Sum algorithm, equal graph partitioning algorithm and so on.
Numerical and experimental study of flexural behaviour in polymer composite materials reinforced with natural fique textiles
Authors: Barros F A , Gamboa J M , Díaz-Ramírez G A , González-Estrada O A , Cruz R A
Published: June 2019

This work presents the experimental testing and numerical modelling for the flexural behaviour of polymer composites reinforced with fique fibre (furcraea andina) textiles. We considered two different textile configurations embedded in an epoxy matrix to perform the experimental tests and used finite element analysis (FEA) for the numerical approximation. Bending tests are performed according to ASTM D7264. We determined the equivalent elastic properties for the woven composites, according to the properties of raw materials and the fibre-matrix interface. Next, we applied flexural loads to the numerical models to analyse their mechanical behaviour and compared the numerical results with the experimental data previously obtained. This research aims to contribute to establish a baseline to develop new mechanisms to forecast the mechanical behaviour of composites reinforced with natural textiles, and, in this way, propose applications for structural engineering.
Study of ZnO1-xSx synthesis by non-alcoxide sol-gel method employed in the photocatalytic degradation of a persistent organic pollutant in water
Authors: Mena Arenas Javier , Mass Varela Julio , Manotas Albor Milton , Landínez Téllez David
Published: June 2019

Non-Alcoxide Sol-Gel method was used as synthesis route to obtain the ZnO1-xSx compounds at calcination temperatures of 250 ° C, 300 ° C and 400 ° C, doped with Sulfur at mole fractions of x = 0.05, 0.50, 0.80. The samples obtained were characterized structural and optically by both X-ray diffraction (XRD) and diffuse reflectance spectrophotometry. The XRD analysis showed the formation of the Wurtzite type structure proper of ZnO up to Sulfur mole fraction of x = 0.50. It was observed that this phase disappears at a mole fraction of x = 0.80 and converts to Cubic Zinc blende type structure proper of Zinc Sulfide. Furthermore, was observed that increasing calcination temperature higher crystallinity was achieved for all set of samples. The Rietveld refinement method was used to obtain lattice parameters for Wurtzite structure as well as cell volume and the ratio c/a. These parameters show slight incremental changes in relation to S doped ZnO crystalline structure. On the other hand, it was determined optically, that increasing the dopant concentration to a mole fraction x = 0.50, a maximum reduction of the band gap from 3,29 eV to 2,70 eV was reached, while increasing the calcination temperature shows a general tendency to band gap reduction. Photocatalytic activity of Sulfur doped and pure ZnO powders were tested for degradation of p, p’-DDT under visible light, measuring the p, p’-DDT time-dependent concentration by gas chromatography-μECD coupling. The results revealed that the sulfur modified ZnO material showed an improved photocatalytic activity towards p, p’-DDT under visible light illumination respect to pure ZnO.
Platinum vs transition metal carbide surfaces as catalysts for olefin and alkyne conversion: binding and hydrogenation of ethylidyne
Authors: Jimenez-Orozco C , Florez E , Moreno A , Rodriguez J.A.
Published: June 2019

The development of heterogeneous catalysts with activity for the hydrogenation of unsaturated hydrocarbons is of economic importance. Ethylene (C2H4) and acetylene (C2H2) are probe molecules useful to understand the hydrogenation mechanisms, where the most studied surfaces are Pt(111) and Pd(111), however, they have a limited activity due to the formation and accumulation of ethylidyne (CCH3) species. Therefore, alternative catalysts should be developed to limit and/or avoid the formation of ethylidyne on the surface. Transition metal carbides has been reported as alternative catalysts, with the additional advantage of lower prices. The thermodynamics of ethylidyne binding and its transformations on δ-MoC(001), TiC(001), and β-Mo2C(100) surfaces are studied by means of periodic DFT. The results indicate that ethylidyne could be transformed to ethyl and ethane on δ-MoC(001) and TiC(001) surfaces, which are relevant species to the Horiuti-Polanyi mechanism. Therefore, these surfaces could be an alternative to Pt(111) and Pd(111), since ethylidyne could be transformed to other species, avoiding or limiting their deactivation. Conversely, ethylidyne cannot be transformed to vinyl (CHCH2) or ethylene in a Horiuti-Polanyi-like mechanism; then, it is not thermodynamically feasible to use any of the studied surfaces in the selective hydrogenation of acetylene, since ethylidyne accumulation could poison the surfaces.
Shallow donor in spirally rolled-up quantum well
Authors: Castro D Y , Mikhailov I D
Published: June 2019

We study the spectral properties of a shallow donor confined in spirally rolled-up narrow quantum well, in the e˙ective mass approximation. By using the natural curvilinear coordinates, we reduce the problem for the actual system to a two-dimensional wave equation that describes the movement of the electron bound to donor inside the rolled-up well. Solving this equation by means of the double Fourier series expansion method, we found lower donor energies and the density of energy states for different donor positions. Our calculations show that donor energies are very sensible to the variation of the donor position and the geometry of the spiral.
Quality Control Implementation on Digital Radiography Equipment at Fundación Valle Del Lili
Authors: Durán E J , Salas L F , Benavides S O , Bolaños G
Published: June 2019

Either national regulatory process or international accreditation process obligates the healthcare institutions to implement a quality control programs to the digital radiography equipment. These are made in order to assurance the high quality image and to reduce the unnecessary exposure doses on people. In radiology, a good diagnostic is related with the high quality of the image. In this research it is showed the results of 90 quality control tests performed on three different equipment located at Fundación Valle del Lili (FVL). These tests were particularly: physical location inspection, geometrical features, quality of the beam, automatic exposure control (AEC), quality image in digital systems, dose measurement systems, etc. Outcomes were compared with manufacturer’s reference values. A percentage of 92.23 % were found out in optimal conditions, this means 83 checks. The Dose Area Product (DAP) tests’ results are in a range between 5.57 to 2574.70 μGy*m2, which are reported in the literature. Those tests that not belong in the reference values, were subject to corrective actions and it is generated a feedback about the possible failures.
Estimation of soil resistivity by the assembly of a vertical electrical sounding equipment at a university campus at Turbaco, Bolívar
Authors: Caraballo D , Caballero M
Published: June 2019

A low-cost geoelectric equipment was implemented for academic purposes to carry out the Vertical Electrical Sounding method in order to determine the resistivity and depth of a point on the surface of a university zone and obtain the contrasts of that resistivity parameter for each type of soil. A model was reproduced at the laboratory to calibrate the equipment, and then the technique was tested in the field. Among the results, layers of sandy loam, soft limestone and dark clay with thicknesses of 0.3 m, 0.75 m and 12 m respectively were obtained, finally a clear clay was obtained whose thickness is unknown. These were compared with reference samples by well drilling method. There was a concordance between the results through the method of statistical confidence intervals with a normal distribution. The data behaved according to a soil model of lower-higher-lower resistivity.
A brief discussion of the magnetocaloric effect in thin films of manganite doped with chromium
Authors: Campillo G , Figueroa A I , Arnache O , Osorio J , Marín Ramírez J M , Fallarino L
Published: June 2019

In this work we report on the magnetocaloric effect of La2/3Ca1/3MnO3 (LCMO) and La2/3Ca1/3Mn0.94Cr0.06O3 (LCMCrO) manganite thin films grown by DC magnetron sputtering on LaAlO3 (100) substrates. X-ray diffraction shows that both doped and undoped films crystallize in the orthorhombic structure. Magnetic measurements show a decrease in both the Curie temperature, TC
, and the saturation magnetization, MS
, for the LCMCrO sample. The change in the magnetic entropy (ΔSm
) was extracted from hysteresis loops at different temperatures around the ferromagnetic to paramagnetic transition, displaying a maximum of entropy change (ΔSm
)
max
near TC
in both films. Moreover, a shift in (ΔSm
)
max
toward temperatures above TC
with increasing magnetic field and a broadening of the entropy change curve were observed. Results of refrigeration cooling power show a lower efficiency for LCMCrO. In order to obtain a local insight into the magnetic interactions of these films, measurements of X-ray absorption spectroscopy and X-ray magnetic circular dichroism (XMCD) were performed. XMCD suggests that an antiferromagnetic coupling between Mn4+ - Mn3+ is favored with Cr3+ incorporation, which reduces the Mn L
2,3 XMCD signal and results in a decrease of MS
and (ΔSm
)
max
in LCMCrO films.