bluuebunny/crossref_metadata_2025_split huggingface dataset:
Face to Face: Christian Borchert's Artist Portraits from 1975/76
Authors: Kaschek Bertram 
Published: November 2018

Face to Face: Christian Borchert's Artist Portraits from 1975/76 The Artist Portraits from 1975/76 were Christian Borchert's (1942–2000) first great project as a freelance photographer. For almost two years, Borchert travelled the GDR in order to take the likenesses of about 200 artists (painters, sculptors, writers, composers and film-makers). He finally presented a good number of them in two much-noticed Berlin exhibitions in the fall of 1976. This article investigates the aesthetic, social and political implications of Borchert's complex project, which so far has never been subject to detailed scholarly analysis. It demonstrates how Borchert, working in a totalitarian system, which attempted to socialize, profile and control public discourse, made use of photography as a medium of negotiation between the private and the public, between individual aspirations and official ideals, and between art and politics.
Experimental evaluation of toxic properties of LCTA-2034 by the oral routeof administration
Authors: Treschalin M. I. , Treschalin I. D. , Golibrodo V. A. , Shchekotikhin A. E. , Pereverzeva E. R. 
Published: November 2018

Introduction.New antitumor multitarget drug LCTA-2034, obtained in Gause Institute of New Antibiotics, has demonstrated high activity against prognostically significant transplantable mice tumors by the oral application.Objective.To investigate the toxicological properties of LCTA-2034 by the oral route of administration on rats.Materials and methods.Toxicological study of LCTA-2034 was performed on 30 male Wistar rats. Drug substance dissolved in potable water. 2 % solution was administrated per os at the 1 and 5 therapeutic dose (15 × 20 mg/kg or 15 × 100 mg/kg with 24-h interval). During the study dynamics of body weight, hematological parameters, blood biochemical parameters, electrocardiography and urinalysis were performed for all animals. Five animals in each group were sacrificed 1 and 30 days post treatment. The internal organs were subjected to histological evaluation.Results.The results of the study demonstrate that the treatment with low dose of LCTA-2034 does not produce any changes in majority of examined clinical-laboratory parameters with the exception of urinalysis revealed hematuria on day 1 post treatment. Microscopic pathology observation showed structure abnormalities of varying severity in liver, kidneys, heart, stomach, jejunum, ileum, spleen and thymus. Administration of high dose of LCTA-2034 caused mortality of 2 rats in group. The rest of the rats were observed a body weight lag, decrease of total leukocyte and erythrocyte count, hemoglobin and hematocrit level, relative weight of the thymus. Erythrocytes and nitrates were found in urine both on day 1 and on day 30 post treatment. In groups treated with high dose of the drug in addition to the listed above organs damage of the structure of lymph nodes, pancreas, ileum and brain was detected. Conclusion. Revealed toxic properties of LCTA-2034 depended on dose. Multiple administration of 1 therapeutic dose of the drug produces transient toxic effects completely reversible within 30 days.
Crystal preferred orientation of olivine in mantle xenoliths from Catalonia (NE Spain) Orientación cristalina preferente del olivino en xenolitos mantélicos de Cataluña (NE de España)
Authors: Fernández-Roig M. , Galán G. , Mariani E. 
Published: November 2018

Abstract: Mantle xenoliths in Neogene-Quaternary alkaline volcanic rocks from the Catalan Volcanic Zone indicate that ≪anhydrous≫ spinel lherzolites, harzburgites and much subordinate olivine websterites form the lithospheric mantle of NE Iberian Peninsula. Olivine crystal preferred orientation, determined by indexation of electron-backscattered diffraction patterns, provides three types of deformation fabric: a dominant [010]-fiber type in peridotites and websterites equilibrated at high temperature, and subordinate orthorhombic and [100]-fiber types, which appear mostly in porphyroclas tic and equigranular lherzolites equilibrated at lower temperature.Keywords: Lithospheric mantle, lherzolites, harzburgites, websterites, olivine, deformation fabric.Resumen: Los xenolitos mantelitos en lavas alcalinas neógeno-cuaternarias de la Zona Volcánica de Cataluña indican que lherzolitas y harzburgitas ≪ anhidras≫ y con espinela son las rocas predominantes en el manto litosférico del NE de la Península Ibérica, con presencia también subordinada de websteritas olivínicas. Las orientaciones cristalográficas preferentes del olivino, determinadas por indexación de los espectros de difracción de electrones retrodispersados, muestran tres tipos de fábrica de deformación: una dominante, tipo axial [010], en peridotitas y websteritas equilibradas a alta temperatura, y otras subordinadas, de tipo ortorrómbico y axial [100], que aparecen en lherzolitas porfidoclásticas y equigranulares equilibradas a menor temperatura.Palabras clave: Manto litosférico, lherzolitas, harzburgitas, websterita, olivino, fábricas de deformación
The Undisclosed Chapter of the Textbook on Electrical Engineering
Authors: Andreevich Parfentiev Nikolay 
Published: November 2018

A special point was found in the frequency characteristics of the oscillatory circuit, which was not mentioned earlier in textbooks on electrical engineering and radio engineering. The module of complex resistance of the circuit does not depend on the value of the active resistance at a frequency less than times that of the resonance. The material is of interest to all engineers and scientists specializing in electrical engineering. On its basis, new methods for measuring the parameters of electrical circuits can be developed. Physical interpretation of the phenomenon doesn't exist at the moment.
Identification of modern amenities in accommodation servicesâ€”Analysis for Polish business tourism
Authors: Zontek Ewa Lipianin , Zontek Zbigniew , Szewczyk Irena 
Published: November 2018

This paper presents an overview of the issues related to the readiness of Polish hotel establishments to develop business tourism services. Hotels that support business tourism need to constantly evaluate the potential competitiveness of tourism offers, to enable them to improve their product development. Modern trends in these services are forcing the industry into continuous improvement and innovation. The aim of this paper is to identify new innovative amenities for business tourism around the world and, consequently, to diagnose the competitiveness of facilities in Polish hotels. Statistical data shows that business tourism in Poland has many development opportunities. However, for their effective utilisation, hotel establishments should develop their resources in terms of both quantity and quality.
Keywords: Business tourism, accommodation services, amenities.
How MOOC-Takers Estimate Learning Success: Retrospective Reflection of Perceived Benefits
Authors: Sablina Svetlana , Kapliy Natalia , Trusevich Alexandr , Kostikova Sofia 
Published: November 2018

Massive open online courses (MOOCs) have attracted a great deal of interest in recent years as a new learning technology. Since MOOCs inception, only limited research has been carried out to address how learners perceive success in MOOCs after course completion. The aim of this study was to investigate the perceived benefits as the measurement of learning success. Narrative interviews were conducted with 30 Russian-speaking learners who completed at least one MOOC in full. By employing text analysis of interview transcripts, we revealed the authentic voices of participants and gained deeper understanding of learners' perceived benefits based on retrospective reflection. The findings of the study indicate that after finishing MOOCs, learners have received tangible and intangible benefits that in general justified their expectations. University-affiliated students, as well as working professionals, recognized the complementarity of MOOCs, but their assessments were limited to educational tracks. We discovered that taking MOOCs often coincided with the time when an individual was planning to change career, education, or life tracks. The results of the study and their implications are further discussed, together with practical suggestions for MOOC providers.
Improving Electric Submersible Pump ESP Bearing System Reliability in Unconventional Applications
Authors: Nowitzki Wesley , Webster Josh , Beck David 
Published: November 2018

Abstract
Some conditions present in unconventional wells, such as high abrasives content, high gas-liquid ratios, and high temperatures, are detrimental to the bearing systems of an electric submersible pump (ESP) because they decrease system run-life. A testing regimen was conducted using a slurry loop (a specially designed flow loop capable of handling fluid with high sand content) to examine the effects of fluid with high abrasives content on pump wear and using an industrial oven to examine temperature effects on bearings and bearing materials. Controlled variables during testing included bearing material, assembly methods, component features, build configurations, flow rate, and thrust loads. Testing produced statistics on the properties of industry-standard bearing materials and data on the performance of bearings and bushing retention in high abrasive and high temperature environments, resulting in the development of a model of bushing retention. Testing of modifications to the bearing systems resulted in a change in bearing materials and a patented (Nowitzki and Roberts 2016)high thermal expansion material (HTEM) bushing retention system that, respectively, increased bearing abrasive resistance sixfold and reduced the occurrence of bushing migration in high temperature environments from 90.3 to 10% of the population.
Permanent Caprock Abandonment P&A Assessment Incorporating Rock Mechanics Analysis: Petrophysics Perspective
Authors: M Shah Jamari , Sutiyono Sigit , M Dahlan Nur Athirah , Ramly Noor Faezah 
Published: November 2018

Abstract
Well abandonment has been associated and considered since in the Field Development Plan stage. Worldwide, government and legislative authorities are having specific requirement and regulation in ensuring the oil and gas industry to seal and permanently take offline unproductive wells to prevent them from impacting the environment and safety. When all feasible opportunity is exhausted and no remaining economic potential is proven in a well or field, it will proceed to abandonment, saving money spent on well liability cost. In effort to reduce the P&A cost which has no financial return, operators and regulators strive to improve P&A method to increase efficiency without compromising safety.
The production of oil and gas, whether or not enhanced by the injection of water or gas, will cause a change of pressure, stress and temperature in the reservoir and its surrounding formations. Additionally, chemical characteristics of the injectant, may reactive gases for storage or production enhancement, may lead to changes in petrophysical, geomechanical and chemical properties of subsurface formations, faults and wells equipment. These changes may or may not have a detrimental effect on the containment of toxic or otherwise harmful fluids and gasses in the subsurface. The comprehensive P&A analysis and program is vital to ensure the security of well containment. Loss of containment may lead to potential loss of life, assets, environment and reputation.
This paper will discuss the analysis done by Petrophysicist in supporting the decision and design of well P&A design, either isolation at reservoir level or caprock level. After no remaining potential and shallow hydrocarbon is verified, the well will be conditioned for pressure analysis and caprock assessment, by formulating well dynamic strength parameters, namely Young modulus and UCS and establishing pressure column. The competent caprock at the proposed barrier depth will be assessed, benchmarked and inventoried for regional caprock understanding, taking account input from multidiscipline.
In addition to additional assessment on rock strength in well P&A design, this paper also recommend the multidiscipline future collaboration assessment technique for better regional caprock understanding. When possible, this method is able to provide feasible P&A design with some confidence level at the competency of the withholding caprock.
Planning & Execution of FIELD 1 Subsea Facilities Decommissioning
Authors: Yap Tai Liong, 
Published: November 2018

Abstract
The scope of the subsea field abandonment comprises plugging & abandonment (P&A) of subsea well, topside preparation, pipeline flushing and removal of subsea equipments like the wellhead christmas tree, sections of pipeline (expansion spool) and sections of umbilical control line. The remaining pipeline on seabed toward host platform will be left in-situ. These are the scope of the concept selected in DOA, which were further matured in Abandonment Plan.
Objectives of the project are: Improve safety and eliminate integrity riskEliminate OPEX for Well that has demonstrated no further potential for economical productionFulfil PSC Abandonment Obligation Plan
The execution of the subsea field abandonment harnessed resources from various specialties ranging from CAT3 to Wells, CAT1 and Subsea, coherently progressing as a single team. A good deal of attention was paid to the technical integrity and long term plan of existing asset, which also played a major role setting the magnitude of work.
Lacking in experience in abandonment, we leveraged on the existing industrial resources and expertise where required, in order to realise a cost-effective execution. The activities were planned in accordance with applicable Production Sharing Contract, PETRONAS Procedures and Guidelines for Upstream Activities (PPGUA) 3.0, Shell Internal Guidelines, and the applicable local and international regulations.
Overall execution strategy and schedule was considerably influenced by pipeline flushing method and schedule of existing resources, which could be fairly aggressive, in contrary to popular belief that abandonment projects are not schedule driven.
Bundling of activities is the key to cost-effective execution, though the challenge escalates as we move from bundling of activities, to bundling of campaigns.
Malaysia's First Subsea Development Well Plug and Abandonment
Authors: Othman Fuad , Teo Choon Hoong , Bakri Faiz 
Published: November 2018

Abstract
A semi-submersible drilling rig chosen to perform the subsea well abandonment. The campaign consisted of abandoning four development wells which were completed with Horizontal Xmas Tree and having sustained casing pressure. In this paper, the methodology for performing the plug and abandonment of each well was divided into four main phases. Secure wellCut and retrieve TubingReservoir plugRemediation of sustained casing pressure
The cleanliness of the Chirstmas Tree VX sealing profile is crucial before the deployment of the subsea Blowout Preventer (BOP). A modified wellhead cleaner was created for the efficient cleaning of the VX profile. Caprock restoration was implemented for the effective isolation of the zones with flow potential. Conventional section milling to remediate the sustained casing pressure was eliminated by using Perforate Wash and Cement (PWC). This technology has been widely used by Shell North Sea, where the best practices have been incorporated in the operation.
This paper discusses the "first in the world" application of Dual Casing Cup Type PWC to cement across two annuli. The utilisation of the Tubing Hanger Emergency Retrieval Tool (THERT) to retrieve the Internal Tree Cap (ITC) was deemed more cost-effective as compared to the use of Subsea Test Tree (SSTT).
The design of the Lower Crown Plug (LCP) that was installed in the tubing hanger incorporates an erosion plate known as flow target that was screwed onto the plug by four threads. The flow target from the first well was dislodged and is tightly wedged above the TR-SCSSSV and milling may be required to gain access below the TR-SCSSSV.
NEBA Application for Offshore Subsea Pipeline Decommissioning
Authors: Kankamnerd Jariya , Chonchirdsin Surasak , Chanvanichskul Chatawut , Phanichtriphop Pheerasak 
Published: November 2018

Abstract
There is a demonstrated need for both technical and non-technical factors of the decommissioning industry which are the criteria of decision making in decommissioning project development. In Gulf of Thailand, there are huge numbers and volumes of offshore subsea pipelines expected to be decommissioned when the concession is end. The evaluation of pipeline decommissioning technique to determine the optimum final project configuration to reflect the long-term environmental impact or benefit of various decommissioning techniques is required. Therefore, the innovative model "Net Environmental Benefit Analysis (NEBA)" was applied to determine the environmentally project alternative. NEBA model provides a relative ranking on the expected environmental values of project alternatives which based on outcomes of a consensus workshop among stakeholders and regulators which was arranged to obtain final agreement on environmental values identification, weighting and scoring of project.
The semi-quantitative NEBA model used here is structured around the determination of the functional elements of the NEBA: the service impact level, recovery period, post recovery services value, and post-recovery period. This study focus of NEBA is to determine the net benfit for seven different decommissioning techniques for offshore subsea pipelines based on a specific ecological services of the project producing an impact. For the purpose of this study, ten ecological services were evaluated for each decommssioning technique (i.e habitat value, production value and behavioral responses). The mathematics in this model is developed around the service metric gains and losses and considered to be semi-quantitative since the criterion rankings and relatively with respect to baseline are based on the agreement of the workshop.
Finally, the quantitative NEBA score in the context of the clear environmental benefit and impact in each technique was provided to a decommssioning project development decision maker to make defensible decisions to choose the most appropriate cost effective decommssioning technique to company.
The Optimization for Cost-Effective Well Plug and Abandonment Techniques
Authors: Prasetya Afriandi Eka , Herputra Shanni Ardhana 
Published: November 2018

Abstract
Well abandonment is an obligatory work in the Production Sharing Contract. In the midst of low oil prices, this work cannot be postponed to do, especially for wells that have potential hazards. The longer it postponed, the greater risk will be face. It needs to be done with the most efficient way.
Well abandonment of onshore-well in "R" Block of Central Sumatra Basin began in 2015. Reason for abandonment is varied from no more reservoir potential, mechanical problem, bad well integrity, missing part of wellhead, and vandalism. Since the initial start of the well abandonment work, the gold-plated effect appeared. The well abandoned in a very safe method, but not worth the risk.
Discuss the procedures of selecting the well under potential circumstances to be plugged. An adjustment made by optimize it to fit-to-purpose abandonment according to Indonesia national standard while complying with the feasibility and safety operation.
As a result, there is a decrease in average AFE cost during 2015 to 2017 by 29% which equal to US$8.5 million and still has decrease potential until the very fit-to-purpose method obtained. The average realization of AFE cost decrease from 48% to 34%.
This paper shows that there is always a chance for optimization even though abandonment work does not have any gain of production and ignoring it also poses safety and cost risks. To date, this optimization has saved US$2 million.
Dual Annuli Closed System Perforate, Wash and Cement
Authors: Teo Choon Hoong , Stokkeland Thore Andre , Matthews Parker , Helleren Arild , Sainuddin Abdul Karim 
Published: November 2018

Abstract

Objectives/Scope
The Perforate, Wash and Cement technique has been widely implemented in the remediation of annular cement in recent years, with the application gaining increasing confidence within the Well Integrity, Plugging and Abandonment sectors.
With the increase in confidence in the technique to successfully remediate annulus cement comes the evolution of the process; pushing of limitations to meet new and previously challenging plugging and abandonment projects with confidence.
The first attempted and successful ‘Closed System’ type Perforate, Wash and Cement of Dual Annuli is discussed and evaluated in this paper as an effective mean for environmental plugging and abandonment.

Methods, Procedures, Process
For the dual annuli application to be successful, the perforation of 10-3/4" and 13-3/8" casings must be effective without damaging the 18-5/8" casing to ensure efficient hydraulic communication that allows for washing out of annular debris and placement of cement across both annuli and this was verified by a full system test of the charge.
Utilizing a ‘closed system’ (cup tool) perforate, wash and cement method enables constant communication between the isolated swab cups and the annulus behind the perforated casing during the process of washing. As a result of this specific methodology, the amount of annular obstruction is visibly confirmed from surface using standpipe pressure variations long before any debris is seen at surface. The reduction in standpipe pressure over subsequent washing pass is evidence that annular debris has been removed and this is visually confirmed by debris at surface.
Dual annuli washing introduces additional uncertainty regarding effectiveness of washing within the second annulus and the effectiveness of this has been verified by both Computational fluid dynamics analyses (CFD), and full scaled yard test.

Results, Observations, Conclusions
Large volumes of debris consisting of approximately 30% formation cuttings / metal and 70% cement were observed at surface throughout the washing sequence.
Cement was efficiently placed using the ‘Pump and Pull’ method. Utilizing the ‘closed system’ benefit of the cup tool, fresh cement was placed across the entire perforated interval ensuring the highest chance of a successful cement bond.
Post-execution verification was performed on the cement plug and validation of successful placement of the plug was confirmed. Volumetric analysis verified the effective placement of cement into the 10-3/4", 13-3/8" and 18-5/8" annuli.