bluuebunny/crossref_metadata_2025_split huggingface dataset:
SOSYAL MEDYA VE YATIRIM ARAÇLARININ DEĞERİ ARASINDAKİ İLİŞKİNİN İNCELENMESİ: BITCOIN ÖRNEĞİ
Authors: POLAT Mustafa , AKBIYIK Adem 
Published: May 2019

Sosyal medya, insanları alış
veriş alışkanlıklarından yatırım kararlarına kadar birçok ticari niyetleri
üzerinde yüksek etki düzeyi olduğu güncel birçok çalışmada araştırılmaya
başlanmıştır ve bu ilişki ortaya konmuştur. Bu ilişki üzerine inşa edilerek geliştirilen
güncel analiz yöntemleri yatırım araçlarının gelecek değerlerini tahmin ederek
yatırım kararları almada bir destek mekanizması olarak kullanılması çok cazip
bir konudur. Bu sebeple bu ilişki yatırımcı ve analistlerden akademisyenlere
kadar güncel bir ilgi konusu olmuştur.

Bu çalışmanın amacı da sosyal medya ile
yatırım kararları arasındaki ilişkiyi metinsel ve finansal analiz aracılığı ile
görmeye çalışmaktır. Bu çalışmada Twitter üzerinden metin madenciliği ile veri
çekilmiş ve sentiment(duygu) analizi ile yorumların olumlu ya da olumsuz olma
durumu incelenmiştir. Sentiment analizinden elde edilen sayısal değerler ile
güncel ve küresel bir yatırım aracı olan Bitcoin fiyatları arasındaki ilişkinin
varlığını sorgulamak adına Granger Nedensellik analizi gibi finansal analizler
kullanılmıştır.
Contextual definitions and their applicability in the language of law
Authors: Ogleznev V. V. 
Published: May 2019

Contextual definitions within the framework of modern logics and philosophy of science are widely used and explained. Moreover, they have acquired an independent epistemological meaning, along with other types of definitions. However, in the humanities, their applicability has been questioned and challenged many times. The author, on the contrary, substantiates the premise that the effectiveness of contextual definitions, in particular in the legal language, is not lower, and sometimes even much higher than the effectiveness of generic definitions. In a contemporary, especially western legal science, Bentham’s and Harts’s points of view that the contextual definition is opposed to the genetic definition continues to dominate, and the latter in relation to the analysis of legal concepts is recognized as ineffective and unproductive. The author is of the opinion that these two types of definitions may well coexist and in some sense complement each other, taking into account different areas of their applicability. The main and most characteristic area of application of contextual definitions, according to the author, are the constitutional rules of law. Constitutional rules of law in this approach are considered as contextual definitions of the basic concepts by which other rules of law in the legal system are formulated. Contextual definitions are very useful when we need to clarify the very general concepts and terms that can be found, for example, in the text of the Constitution. As a result, the defined terms become semantically meaningful, and their use in the legal language becomes syntactically consistent.
Competency of distal femur locking plate as an answer for fixation of all varieties of distal femur fractures
Authors: Medhi Mriganka Nagen , Mote Girish Balasaheb 
Published: May 2019

<p class="abstract"><strong>Background:</strong> Distal femur fractures are common and need to be treated operatively and for optimal functional outcome. Multiple implants are available for fixation e.g. angled blade plate, dynamic condylar screw, buttress plate, antegrade nailing, retrograde nailing, locking distal femoral plates, external fixator etc. We have designed this study to analyse clinico-radiological outcome and competency of locked plating for all varieties of distal femur fractures.</p><p class="abstract"><strong>Methods:</strong> We conducted a prospective interventional study on 79 consecutive patients with fractures of distal femur operated with locking distal femur plate from January 2015 to February 2018. Patients were regularly followed up with x-rays and clinical examination. At the end of clinicoradiological union, patients were evaluated with Neer’s score.<strong></strong></p><p class="abstract"><strong>Results:</strong> Total 79 distal femur fractures were studied based on inclusion and exclusion criteria. There were 63 (79.75%) males and 16 (20.25%) females. As per AO classification fracture of type A were 39 (49.36%), type B were 10 (12.65%) and type C were 30 (37.97%). Average time period from injury to surgery was 8.2 days. In our study, the average period of clinicoradiological union was 16 weeks. 62 (78.48%) patients had excellent to satisfactory outcome, 13 (16.45%) patients had unsatisfactory and 4 (5.06%) patients had poor outcome.</p><p class="abstract"><strong>Conclusions:</strong> Distal femur fractures are common, complex injuries and different implant option are available for fixation. All types of distal femur fractures can be fixed using distal femur locking compression plate. If fixed following basic principles of fracture fixation good results can be obtained.</p>
BIOGRAPHICAL RESEARCH AND PUBLIC SECTOR ACCOUNTING LECTURERS
Authors: Yuhertiana Indrawati , Andre Purwanugraha Heribertus , Andayani Sari , Andhaniwati Erry , Denhas Kiki Nuriska 
Published: May 2019

Purpose of Study: This research aims to understand the self learning process among accounting lecturers in mastering public sector accounting.
Methodology: The present study has been carried out a qualitative approach within the interpretive paradigm using biographical research. By employing thematic analysis, it was scrutinized 41 curriculum vitae of accounting lecturers. It focussed on education background, work experience, training, and publication related to public sector knowledge.
Main Findings: This research showed that the mastery of public sector accounting is learned by the formal and non-formal education, teaching activities and community services. Ontologically, this study is built on a belief that based on Bloom’s learning theory the effort of accounting educator could explain as lifelong learning in improving their cognitive, affective and pshychomotoric ability.
Implications/Applications: Efforts public sector accounting faculty to master public sector accounting mapped to cognitive, affective and psychomotoric. Strengthening the cognitive aspect is done through formal and non formal education. Some lecturers who do not gain knowledge of public sector accounting from formal education to look through non-formal education in a variety of training activities, workshops and seminars. Basic self learning theory and assumptions andragogy as adult learners who are motivated internally reinforce this fact.
A Method for Estimation of Minimum Effective Pore Throat Radius from Routine Core Analysis Data in Chalk and its Applications
Authors: Nourani Meysam , Schovsbo Niels Hemmingsen , Meyer Aurelien G. , Taheriotaghsara Mirhossein , Sigalas Lykourgos , Olsen Dan , Stemmerik Lars 
Published: May 2019

Abstract
A method for estimating minimum effective pore throat radius from Routine Core Analysis porosity and absolute permeability data is introduced for chalk samples. This method can reduce the need for conducting mercury capillary pressure measurement in the lab to obtain minimum effective throat radius of chalk samples and allow sample screening prior to time consuming core flood.
The investigation was based on four sets of chalk porosity and permeability data from Rørdal, Stevns Klint and two North Sea wells from Dan and Tyra SE fields. For each porosity and absolute permeability data point, three new parameters are calculated from the entire data set of porosity and absolute permeability values. Using these parameters, the model estimates capillary pressures at very low mercury saturations. First, the capillary entry pressure is calculated from Røgen and Fabricius’ empirical correlation. Hereafter a line is fitted between capillary pressures and mercury saturations at very low mercury saturations including the mercury entry point. The extrapolated line crosses the capillary pressure curve at a high mercury saturation between 0.91 and 0.99, which represents a minimum affective pore throat radius. The validity of the method is verified using a set of mercury capillary pressure measurements of chalk core samples. In the following, a correlation between ultimate laboratory oil recovery achieved from a water flooding process, and an expression consists of minimum effective pore throat radius and specific surface area is presented. Our analysis shows that higher oil recovery by water flooding is related to lower minimum effective pore throat radiuses and higher average pore throat radiuses. Using this simple relationship, one can screen samples and evaluate ultimate oil recovery performance by water flooding before conducting core-flooding experiments. In addition, an empirical index is developed to estimate wettability of chalk samples from calculated Rmin, Rave and Rmax of chalk samples.
Multi-String Isolation Logging - A Cost Effective Solution for P&A
Authors: Zhang Jun , Mahbod Pouya , Shafer Randall , Mueller Dan , Anderson Callum 
Published: May 2019

Abstract
During offshore oil and gas well decommissioning, well casing cement bond verification is frequently a critical initial step of well plug and abandonment (P&A) operations. This is done to determine the isolation between geological intervals. To acquire the essential data, conventional cement bond logs (CBLs) and ultrasonic imaging logs require unimpeded access to the casing annulus. Consequently, the production tubing needs to be removed from the wells. These operations are costly as they require securing the well and removing the tubing with an offshore rig, in some cases a mobile offshore drilling unit. If cement integrity or isolation could be determined without removing the production tubing, operational time and costs would be significantly reduced. Hence, multi-string cement bond evaluation for isolation verification without pulling the tubing has been desired by the oil and gas industry for many years.
The innovation described in this paper, consisting of a novel methodology and an associated logging apparatus, leads to a new technique that can evaluate cement bond or isolation around the casing through the production tubing. The acoustic energy emitted and received by a logging tool inside the production tubing travels through tubing and the surrounding annulus to determine the attenuation caused by the material behind the outer casing. The smaller bonding signal, challenged by the dominating signal from the tubing wall, is then successfully identified through unique frequency domain signal processing.
The accuracy of a multi-string logging technology has been verified by extensive offshore field tests in Southern North Sea. Side-by-side comparisons with conventional CBL and ultrasonic logs after the tubing is pulled out have been conducted. The field tests also demonstrate the multi-string logging technology is applicable to all typical casing and tubing weight or size combinations and provides quantitative assessments on isolation conditions of wells through the production tubing.
OpenLab: Design and Applications of a Modern Drilling Digitalization Infrastructure
Authors: Saadallah Nejm , Gravdal Jan Einar , Ewald Robert , Moi Sonja , Ambrus Adrian , Daireaux Benoit , Sivertsen Stian , Hellang Kristian , Shor Roman , Sui Dan , Sandor Stefan Ioan , Chojnacki Marek , Odgaard Jacob 
Published: May 2019

Abstract
The transition towards drilling automation in the oil and gas industry has increased the need for digital infrastructures for development and testing of new technology. This includes infrastructures to facilitate changes in work processes and technical competences. This paper describes the design and use of OpenLab Drilling, a digital infrastructure with applications in education, technology development and testing.
OpenLab Drilling offers access to a high fidelity drilling process simulator capable of simulating transient hydraulics, temperature, torque and drag, and cuttings transport. Since 2018, the infrastructure has been publicly available for students, researchers and engineers who need realistic drilling data for technology development, demonstration and education. The simulated drilling data can be accessed by several means. First, through a user-friendly web application used as a tool for teaching the physics involved in drilling operations. Secondly, drilling data can be accessed programmatically through a web API or via programming language APIs written in MATLAB, Python and .NET. Thirdly, OpenLab offers a fast communication interface that can be used for applications that are closer to hardware, and which require a realistic Hardware in The Loop (HIL) infrastructure.
This paper describes the objectives of OpenLab as a project, its system architecture, its simulation capabilities, the design of its web application, and its various communication interfaces. The paper also presents projects that uses OpenLab in education, research on machine learning, semantical representation of drilling data, and other industrial relevant activities. The paper is naturally divided in two parts: The design of the infrastructure, and its applications.
Data on Work – An Untapped Asset for Operational Improvements
Authors: Clark Alex , Larsen Henrik W. , Nordtvedt Jan-Erik , Stafford Bart T. , Unneland Trond 
Published: May 2019

Abstract
The push within the oil and gas industry towards digitalization hold great promises for optimizing operations and improving efficiency. Therefore, most oil and gas companies have large initiatives within digitalization – huge efforts on data acquisition, Industrial Internet of Things, Artificial Intelligence (AI), Machine Learning (ML) etc. – all digital opportunities introduced to the industry in recent years. We look at data and models as oil and gas "assets" – much like physical assets used in operations (wells, platforms, compressors etc.). Thus, there is a perceived inherent value in data for operations.
For effective operations, the interesting part of data, models and digital capabilities, is the feedback loop it allows to the physical asset itself. One wants to close/open a valve for optimal production, ensure maintenance on machinery and ensure safe scaffolding operations without sending people offshore during planning. There are two types of feedback opportunities to the physical asset – either through automation or by humans. Both humans and automation algorithms can get advice from some "co-bot" based on AI, ML or other digital opportunities. When the feedback is given automatically, we have full control over the work performed by the algorithm or cobot, while the same is not the case when humans are involved.
At certain level engineers and operators know how to do the work – this is embedded into known "work processes." However, the actual interpretation of a work processes into concrete activities may lead to different tasks for team members – even for the same work. This gives lack of repeatability, inconsistency in operations, and makes effective collaborations challenging. In many ways, we lack (real time) data on the work itself, when it's done by humans.
This paper addresses this issue – we explain why data on the work and how effectively it is performed should be regarded as an asset in a similar way to real-time data and reservoir models. We show technologies and examples allowing organization to assess data on the work itself. We discuss how teams can work differently, and how technology can be used to drive consistency and KPIs toward more effective operations.
Reservoir Stress-Path Measured During Depletion and Re-Pressurization in the Valhall Field
Authors: Kristiansen Tron G. , Bauer Andreas , Flatebø Roar , Guida Assia , Nes Olav-Magnar , Skomedal Øyvind 
Published: May 2019

Abstract
Reservoir stress path is most often used to couple the pore pressure change in a reservoir to the resulting change in the minimum horizontal stress in the reservoir. This stress path can directly be measured in a reservoir. The pore pressure is typically measured using standard equipment for doing so during drilling of wells. These pressure measurement devices are either run on wireline or in logging while drilling (LWD) tools. The minimum horizontal stress is typically measured in a hydraulic fracturing operation designed for this purpose. This operation can be performed under a casing shoe (often referred to as an extended leak-off test), through perforations (often referred to as a mini-frac test) or between two packer elements (referred to as a micro-frac test). The stress path will impact many geomechanical aspects in a field development, like wellbore stability, lost circulation (fracture gradient change) and solids production to name three. In the literature there are limited datasets on stress-paths during depletion, and even less on re-pressurization resulting from injection. The Valhall dataset is unique in the industry since it contains hundreds of tests from three different chalk formations. The data has been gathered from mini-frac tests as part of hydraulic propped fracturing stimulation jobs over a 36-year period, and is from an oil and gas industry perspective of very high quality. Water injection has been ongoing in the Tor reservoir the last 13 years and large amounts of data can be used to measure the stress path during re-pressurization. The Valhall data indicate one stress path for depletion and a slightly different stress path during re-pressurization. We compare the measured stress paths with predictions based on core measurements and numerical models and discuss the impact of pore collapse, fault reactivation, arching, and processes during re-pressurization
Corneal wavefront guided versus aberration free transepithelial photorefractive keratectomy in myopic patients with high pre-existing corneal higher order aberrations
Authors: Ellakwa Amin Faisal , Zaki Marwa Ali , Ashour Rana Mohammed 
Published: May 2019

Abstract
Objectives

to compare the efficacy, safety and predictability of corneal wavefront guided (WFG) and aberration free ablation in single-step transepithelial photorefractive keratectomy (TransPRK) in myopic patients with high pre-existing corneal higher order aberrations (HOAs).

Background

Corneal WFG and aberration free treatments have been proposed as methods to achieve better visual, refractive, and optical outcomes.

Methods

Non-randomized controlled trailwas conducted in El-HekmaEye-LASIK center, Menoufia governorate, Egypt during the period from January 2017 to December 2017. TransPRK was performed to eligible myopic patients with or without astigmatism with corneal HOAs ≥ 0.35 µ utilizing either aberration free or corneal WFG patterns provided by ORKCAM software (SCHWIND eye-tech-solutions, Kleinostheim, Germany). Uncorrected distance visual acuity (UDVA), manifest and cycloplegic refractions, best spectacle corrected distance visual acuity (CDVA), thorough slit lamp examination and corneal topography were assessed and repeated six months postoperatively.

Results

Six months postoperatively, 97.6% and 100% of patients achieved MRSE within ± 1D with 76.2% and 66.67% of patients achieved UDVA of ≥20/20 in aberration free and corneal WFG groups respectively. Both groups showed increase in spherical and total corneal HOAs, with no significant difference in corneal WFG (p=0.08, p=0.28 respectively) while significantly higher postoperatively in aberration free group (p<0.001, p=0.001 respectively). Coma and trefoil aberrations declined after corneal WFG technique, yet increased after aberration free one.

Conclusions

both aberration free and corneal WFG TransPRK were safe, effective and predictable in treatment of myopia in patients with high pre-existing corneal HOAs with better aberrometric outcomes in corneal WFG group.
Drug resistance of pathogens causing nosocomial infection in orthopedics from 2012 to 2017: a 6-year retrospective study
Authors: Zhang Bin , Yang Xiaowei , Guo Runsheng , Xie Banglin , Lai Qi , Xu Jiaxiang , Hu Niya , Wan Lijun , Dai Min 
Published: May 2019

Abstract
Abstract

Background

Hospital-acquired infections (HAIs) are an emerging global problem that increases in-hospital mortality, length of stay, and cost. Orthopedics departments experience a particularly high infection rate, partially due to their heavy reliance on invasive medical devices. We performed a 6-year retrospective study to provide valuable insight into appropriate antibiotic use in HAI cases. We also aimed to understand how hospitals could reduce pathogen drug resistance in a population that overuses antibiotics.

Methods

All data (2012–2017) were obtained from the Hospital Information Warehouse and Clinical Microbiology Laboratory.

Results

We isolated 1392 pathogen strains from patients admitted to the orthopedics department during 2012–2017. Escherichia coli (14.7%, 204/1392), Enterobacter cloacae (13.9%, 193/1392), and Staphylococcus aureus (11.3%, 157/1392) were the most common pathogens causing nosocomial infections. The dominant gram-negative bacterium was E. coli, with high resistance to ampicillin, levofloxacin, cotrimoxazole, gentamicin, and ciprofloxacin, in that order. E. coli was least resistant to amikacin, cefoperazone-sulbactam, meropenem, imipenem, and piperacillin-tazobactam. The most dominant gram-positive bacterium was S. aureus, highly resistant to penicillin and ampicillin, but not resistant to fluoroquinolones and cotrimoxazole. We also did not observe isolate resistance to nitrofurantoin, linezolid, and vancomycin. Analysis of risk factors related to multidrug-resistant bacteria showed that patients with open fractures were significantly more susceptible to methicillin-resistant S. aureus infections (p < 0.05). Additionally, extended-spectrum β-lactamase-producing E. coli infections occurred significantly more often in patients with degenerative diseases (p < 0.05). Elderly patients tended to be more susceptible to multidrug-resistant bacterial infections, but this outcome was not statistically significant.

Conclusions

Antimicrobial resistance is a serious problem in orthopedics. To effectively control antimicrobial resistance among pathogens, we advocate extensive and dynamic monitoring of MDR bacteria, coupled with careful use of antibiotics.

Key words: hospital acquired infections; orthopedics; drug resistance; multidrug resistance
Incidence of Post Dural Puncture Headache and Associated Factors Following Spinal Anaesthesia for Caesarean Delivery in Mulago National Referral Hospital
Authors: Nambooze Philo , Samuel Kizito , Kiggundu John Baptist , Kintu Andrew , Nabukenya Mary T. 
Published: May 2019

Abstract
Background

Spinal anaesthesia is a cost effective anaesthesia technique commonly used for abdominal procedures like caesarean sections. The incidence of post dural puncture headaches (PDPH) which is one of the most reported complications) remains unknown in Uganda. We set out to study the incidence of PDPH and associated factors following spinal anaesthesia in mothers delivering by caesarean section in Mulago National Referral Hospital.

Methods

Prospective cohort study among 1294 women that received spinal anaesthesia for emergency caesarean section delivery from July 2015 to February 2016. Consecutive sampling was applied to recruit participants. Pre-tested interviewer administered questionnaires were used to collect information on demographics and associated factors. Both bivariate and multivariate logistic regressions were used with a P value of 0.05 and confidence interval of 95% being considered statistically significant.

Results

The incidence of PDPH was found to be 48.8% (n=239/1294) (95%CI: 46.0-51.6). Significant factors associated with PDPH were history of spinal anaesthesia OR 1.3 95% CI (1.0-1.6) p=0.04 and loss more than 500mls of blood during surgery OR 2.2, 95% CI (1.1-4.2) P=0.02.

Conclusion

Results from our study indicate high incidence of PDPH women undergoing spinal anesthesia for Caesarean section. Prior exposure to spinal anesthesia and blood loss of more than 500mls are the major associated factors. There is need to objectively screen women at risk for PDPH prior to caesarean section and institute appropriate interventions.