bluuebunny/crossref_metadata_2025_split huggingface dataset:
Chronic endometritis in cases with recurrent embryo implantation failure
Authors: El-Sayed Samir Mohamed , Tappozada Tarek Mokhtar , Mansour Fahd Mohamed , Ali Eman Sheta 
Published: November 2022

Background: Chronic endometritis (CE) is a cause of recurrent implantation failure (RIF) in patients undergoing intracytoplasmic sperm injection (ICSI). CE is diagnosed based on the presence of plasma cell infiltration of the endometrial stroma in endometrial biopsies. Hysteroscopy may be suggestive of CE while the immunohistochemistry with specific cell markers for CD138 cells has been suggested as a more accurate test for the diagnosis of CE.Methods: This study included 110 patients with recurrent ICSI failure (two or more), despite using good-quality embryos. Hysteroscopy and endometrial biopsy were performed as an outpatient procedure. Immunostaining was then performed using a mouse monoclonal CD138 antibody. The prevalence rate of CE was calculated, and the correlation between hysteroscopic findings and immunohistochemical results was assessed. Results: In the included patients in this study there was 32 cases (29%) were diagnosed as CE by hysteroscopy, while 27 cases (24.5%) were positive by CD138 immunohistochemistry (IHC), and 18 cases (16.36%) were positive for CD138 IHC with hysteroscopic features of CE. The presence of more than one abnormal hysteroscopic features was considered positive for CE rather than single abnormal feature, the sensitivity, specificity, positive and negative predictive values of hysteroscopy would be 22.2%, 98.8%, 85.7%, and 79.6%, respectively.Conclusions: The negative diagnostic value of hysteroscopy is high, the combination of the two diagnostic modalities (hysteroscopy and CD138 IHC) will aid in the detection of most cases of CE.
Effect of Clinical Rotation Timing on Learning Quality of Dental Students
Authors: Hasanzade Mahya , Ghazanfari Rezvaneh , Siadat Hakimeh , Kharazifard Mohammad Javad 
Published: November 2022

Objective: Dental educational curricula are under constant modification and improvement. However, designing a comprehensive, efficient, and flexible curriculum is still challenging for the authorities. An efficient curriculum should obviate the educational needs of students and promote their knowledge and expertise for future practice. Time planning of clinical rotations is highly important for optimization of the learning process. This study aimed to compare the efficacy of two different timing models of clinical rotations, namely four versus two rotations in each semester.
Materials and Methods: A total of 74 dental students and 54 faculty members of Tehran University of Medical Science that experienced both rotation models for two consecutive years (2018 and 2019) participated in this study. A questionnaire was designed to assess different aspects of the two timing-models.
Results: A one-sample t-test indicated that students' and faculty members' mean perception were significantly better regarding the two-rotation program.
Conclusion: This study indicated that changing the time planning of educational rotations can affect different aspects of education.
Effect of Multimodal Intervention on Nursing Students ‘Adherence to Hand Hygiene: An Experimental Study
Authors: Sadafi Mahsa , Bahmanpour Kaveh , Nouri Bijan , Valiee Sina 
Published: November 2022

Background Hand hygiene adherence is highly important in clinical practice and is influenced by various factors. Aims This study investigated the effect of multimodal intervention on nursing students ‘adherence to hand hygiene in clinical practice. Methods Internship nursing students were randomized into control ( n = 20) and intervention ( n = 26) groups. Adherence to hand hygiene was measured by self-report questionnaire and by observation. The intervention group received multimodal interventions for 1 week. Findings Results showed significant effects of multimodal intervention on adherence to hand hygiene in “before contact with the patient,” “before and after contact with the patient” situations, and at the beginning of medication administration, catheterization, vital sign measurement, and blood sugar testing. Conclusion The multimodal intervention improved adherence to hand hygiene in the intervention group. Given the importance of hand hygiene adherence by nursing students in all situations, designing and implementing context-based multimodal interventions are recommended as part of nursing students ‘educational programs.
Spectrum of Quaziperiodic Variations in Paleomagnetic Activity in the Phanerozoic
Authors: Kurazhkovskii A.Yu. , Kurazhkovskaya N.A. , Klain B.I. 
Published: November 2022

Abstract
—Detection of common quasiperiodicities in the paleointensity behavior and lengths of polarity intervals of the Earth’s magnetic field was carried out. The paleointensity data were analyzed in the 170 Ma–present day interval. Behavior of the lengths of geomagnetic polarity intervals was investigated within the interval spanning the entire Phanerozoic (540 Ma–present age). It was found that the spectrum of the main paleointensity variations and polarity interval lengths is discrete and includes quasiperiodic variations with characteristic times of 15, 8, 5, and 3 Ma. The characteristic times of these quasiperiodic variations in the geomagnetic field at the beginning and end of the Phanerozoic differed not more than 10%. The spectral density of quasiperiodic changes in the geomagnetic field changed cyclically over geological time. The connection between the behavior of the amplitudes of paleointensity variations, the lengths of geomagnetic polarity intervals, and their spectral density is shown. The spectral density of quasiperiodic paleointensity variations (geomagnetic activity) was relatively high in the 150–40 Ma interval (Cretaceous–early Paleogene). At this time, the amplitudes of paleointensity variations and the lengths of geomagnetic polarity intervals increased. Within the intervals spanning 170–150 Ma and 30 Ma–present age, the quasiperiodic variations of paleointensity were barely expressed against its background noise variations, while the amplitudes of paleointensity variations and the lengths of polarity intervals were decreasing. Alternations of the time intervals in which paleointensity variations acquired either a quasiperiodic or noise character took place during the evolution of the geomagnetic field.
The Study into the Optimal Placement of Horizontal MSHF Wells Relative to the Regional Stress in a West Siberian Field Using the Dynamic Marker-Based Production Profile Surveillance Technology
Authors: Shestakov Dmitry , Badrtdinov Ilshat , Galiev Marat , Malyavko Evgeny , Gorbokonenko Oksana , Titovsky Nikita , Bydzan Andrei , Bolshakov Viacheslav 
Published: November 2022

In the context of hard-to-recover hydrocarbon reserves, the role of timely and high-quality decision-making at the initial stage of project implementation is becoming even more crucial. Along with numerous variable parameters used in the development system design tasks, such as the producer/injector ratio, well spacing, well types, completion method, etc., one of the key factors is the selection of a placement pattern for horizontal wellbores of production wells relative to the regional stress.
Given the low-permeability reservoirs at the West Siberian fields, hydraulic fracturing (HF) is virtually the only method to manage the reservoirs in an efficient and economic manner. In this region, horizontal wells fitted with frac sleeves are drilled on a permanent basis, while an urgent task that affects the formation of an efficient drainage zone is to substantiate the location of the wellbore and of man-induced fractures that appear during multi-stage hydraulic fracturing (MSHF) relative to the maximum stresses.
In this paper, a study into the optimal placement of horizontal MSHF wells was made to ensure stable oil reserves recovery and increase the reservoir sweep efficiency in one of the areas of a large oil field. The key objective in this work was to determine the long-term reserves recovery efficiency in the wells with different orientations of their horizontal boreholes. In order to assess the inflow profile and composition in the horizontal wells, the dynamic marker-based production profile surveillance technology, which is one of the advanced industry standards in production logging, was applied [1].
Modeling and Simulation of Non-Darcy or Turbulent Flow for Oil Wells
Authors: Li Dachang , Ionescu Corneliu-Liviu , Ehighebolo Ivbade Thaddeus , Haynes Jr. Byron , Zhazbayeva Ainur , Yergaliyeva Bakyt , Francia Luigi 
Published: November 2022

Abstract
Modeling and simulation of non-Darcy or turbulent flow are well documented in the literature and available in commercial reservoir simulators (E300, Intersect) only for gas wells rather than oil wells. There is a need to model non-Darcy or turbulent flow in reservoir simulation for oil wells in the carbonate reservoirs with highly connected and densely distributed fractures and karst. This paper proposes a new non-Darcy or turbulent flow modeling and simulation method for oil wells. Unlike the industry's existing methods for non-Darcy or turbulent flow that focus on the non-Darcy coefficient only, this paper presents a new method that models the ratio between non-Darcy and Darcy flows such that a unified model for a field or a region can be created, which significantly simplifies the non-Darcy or turbulent flow modeling process for multiple wells, especially for future wells. The ratio-based method is simple and comprehensive. It can be easily calibrated with MRT (multiple-rate test) data and implemented into in-house or commercial reservoir simulators using a simulator supported scripting language, e.g., Python etc. Kashagan is the world's largest oil reservoir discovered in the last 30 years that contains highly connected and densely distributed fractures and karst in its rim. The oil production rate for a well in the rim can be higher than several tens KSTB/D if it is not constrained by the facility. The current MRT data in all tested wells clearly show non-Darcy flow phenomenon and confirm that modeling non-Darcy flow is necessary to the field. Kashagan had experienced difficulties to match BHP (bottom hole pressure) and large errors in the blind test due to the OPEC's production curtailment and high-rate tests. Build-up pressure curves were miss-matched and HM (history match) of the crossflows (10 KSTB/D with less than 10 psi) in the bottomhole of a PLT (production logging tool) well during shut-in was challenging. Since modeling non-Darcy flow for oil wells in the commercial simulators, e.g., E300 and Intersect, is unavailable, the simulation team in NCOC has created a new method for the needs of non-Darcy modeling and simulation. The applications of the new method have resulted in the excellent results and solved the issues of history matching BHP, high/low-rate tests, build-up pressure trends, and bottomhole crossflows.
Application of Machine Learning Algorithms to Predict Plant Process Upsets During Well Cleanup
Authors: Toleubay Bagdat , Orazov Baurzhan , Sadyrbakiyev Renat , Neubauer Edward 
Published: November 2022

Abstract
Tengizchevroil (TCO) has several stages of put-on production (POP) process to bring the new wells online. New wells need to be cleaned up before being fully brought online and directly routed to the plants. However, reservoir conditions in Tengiz require drilling and completion methods that often results in losing significant amounts of drilling and completion fluids which comprises of barite, cuttings, and emulsions. The presence of such drilling and completion materials may and does cause plant upsets which consequently leads to significant LPO (Lost Production Opportunity).
To minimize plant performance upsets and equipment problems during a controlled well ramp-up of new, reworked, and stimulated wells (or, in short: plant flowback), a prospect of data analytics application arose intending to study the leading hitters that affect the processing at the plant during flowbacks and subsequently optimize the well flowback process.
By applying machine learning and statistical methodologies, a machine was given the ability to perform prognosis on plant upsets and duration of the plant flowback. The approach is broken into three main stages. Stage 1: create a consolidated history of plant flowbacks. Stage 2: determine variables that have the highest impact on plant performance (this stage would reduce the complexity of the model by removing irrelevant variables and subsequently increase the accuracy of the machine learning model). Stage 3: build an algorithm that predicts plant upsets from the variables extracted in Stage 2 (provides a data-driven method for evaluating risks associated with plant flowback).
A supervised classification model was built on historic data from 2011 that evaluated plant performance risks associated with the well flowback process. Given the risk probabilities, we could predict how long it would take to complete plant flowbacks on a subset that the model had not seen before. Additionally, it was shown that given the evaluated risk for the subset the model has not seen, a sequence in which these wells were put online could have been optimized to maximize production.
The feasibility of machine learning capabilities was tested on the historic plant flowback data. The study results have confirmed the intuition of the subject matter experts but in a robust and data-driven way. The model and the approach show data analytics methodologies’ applicability to optimize production operations further.
World's First Application of Steel Body Bit in High Chloride Formation with Water Based Mud
Authors: Uandykov Bekbolat , Kurmanbayev Yerkin , Tagirov Anzor , Muratov Teymur 
Published: November 2022

Abstract
Operator in North Western Kazakhstan, onshore Karatobe Yuzhnyj field was engaged in a task of reducing the well construction time in particular the challenging 12 ¼ in. section. The main complexity of drilling the 12 ¼ in. section is the presence of corrosive salt deposits traditionally drilled with matrix bodydrill bits aggravated by drilling with water-based mud (WBM) system. While matrix body drill bit is the primary choice in salt saturated drilling fluid and corrosive environment, consequences of this choice have a significant impact on the bit's poor rate of penetration (ROP) response.
The long 12 ¼ in. section is usually drilled in 3-4 bit runs with relatively low ROP and poor bit performance primarily occurs due to bit balling in shale section and Weight On Bit (WOB) limitations in interbedded carbonate section.
During the planning stage for the drilling campaign the Operator engaged with Zhigermunaiservice LLP drill bit engineering group to develop a fit-for-purpose solution for ROP optimization. New 12 ¼ in. ZS56 steel body drill bit with unique hardfacing design, improved hydraulics and shaped PDC cutters was developed and delivered on time for the drilling campaign. During the very first run the newly designed steel body bit demonstrated an outstanding performance in drilling highly corrosive salt deposits and other lithological sequences thus delivering the section from shoe to TD at record ROP. This bit was re-used to drill four consequent wells with similar performance.
Using Hybrid Digital Models to Analyse Well Interference and Optimise Field Development Management
Authors: Husein Nadir , Drobot Albina , Vasechkin Dmitry , Urvantsev Sergey , Bydzan Andrei , Bolshakov Viacheslav 
Published: November 2022

Abstract
Effective development of oil fields is impossible without reliable information on the degree of well interference.
The interference between production and injection wells is evaluated using indicators that are commonly known as the interference coefficients or connectivity coefficients. There is a number of statistical, analytical, and predictive methods for hydrodynamic connectivity (interference) assessment.
This paper focuses on a new approach designed to overcome the challenges associated with the rational development of reserves and well interference assessment with building an improved hybrid material balance model.
The purpose of the research was to evaluate various scenarios for well interference assessment, as well as to identify hydrodynamic communication between injection wells and specific producing wells for prompt decision-making to optimise the development system. The paper discusses the results of studies conducted on one field of Western Siberia, having a complex geological structure and highly heterogeneous.
Well interference coefficients were obtained as the result of the studies, which helped understand what average proportion of water injected from a particular injection well effectively impacts the producing wells in question located in the immediate vicinity. The digital hybrid model was used to identify the injection wells that are hydrodynamically connected with producing wells, estimate the degree of their impact on the production performance of the latter, as well as monitor the dynamics of such influence for each well. Based on the analysis performed, some recommendations were elaborated for improving the oil recovery factor in the oil fields and reducing development costs.
Corporate Qualification and Motivation Program for Petroleum Asset Management
Authors: Ganiev Bulat , Lutfullin Azat , Glazkov Andrey , Kalinnikov Vladimir , Aslanyan Artur , Mustafina Alfiya , Gulyaev Danila , Farakhova Rushana 
Published: November 2022

Abstract
The purpose of this paper is to share the Tatneft experience in digital training of the corporate petroleum asset field development teams. It was designed as an integrated program of reservoir development to provide practice of employing best practices of reservoir management over the years [5].
It is worth noting that over the past few years, many professional teams competed in various PetroCup Tournaments, and each team ranging around 10 members. These teams comprised multidisciplinary oil and gas engineers from various organizations across the world.
During each PetroCup session, teams are given a challenge to tackle various problems that exist in petroleum digital asset. PetroCup features a unique regional economy and simulates realistic conditions for field development. Even though each team is unique, statistics show that there is a pattern as to which field development techniques are effective and which are not. Asset managers will find this training facility very useful in evaluating the effectiveness of corporate Well & Reservoir Management and Field Development strategies and improving their efficiency.
On the next pages you will find previous session statistics which Tatneft teams achieve over the years, it will be used to determine the overall skill level of each team member and understand how their active engagement in PetroCup Tournaments affected their field development skills.
External validation of a prognostic model for 1-year survival after fragility hip fracture: A retrospective cohort study
Authors: Fu Hairui , Li Feixiong , Wei Fangfang , Qu Weihan , Wu Dou , Liang Bin , Zhang Xuan , Liu Qiang 
Published: November 2022

Abstract
Background
To scientifically manage fragility hip fracture patients, we have developed a survival prediction model for predicting 1-year survival after fragility hip fracture (SFHF). This study aims to validate the model.
Methods
This was a retrospective cohort study conducted in the orthopaedics department at a regional medical centre in central China. Fragility hip fracture patients who were consecutively admitted to the orthopaedics department from January 2016 to October 31, 2021. We evaluated the performance of an SFHF model (including the full model and the simplified model) from the following three aspects: (1) Discrimination. We presented the concordance (c) index of the model, including Harrell's c-index and Uno's c-value. Overall performance was measured using Nagelkerke R2 values. (2) Calibration. The calibration plot method was used to evaluate the calibration of the model. (3) Decision curve analysis (DCA) was used to judge whether the model had clinical value in the validation population.
Results
A total of 877 (≥ 50 years) (out of 1132) eligible fragility hip fracture patients were included in this study. Among them, 47 patients were lost to follow-up. Among the patients who were successfully followed up, 87 died within 1 year of the fracture. After applying simple imputation to deal with missing values, the final effective sample size was 93 cases. The 1-year mortality rate after fracture was 10.6%. The Harrell’s c-index values of the full and simple SFHF models were 0.764 (standard error, 0.024) and 0.763 (0.024), respectively. Uno’s c-values were 0.765 (0.024) and 0.763 (0.024), respectively. The Nagelkerke R2 values were 0.144 and 0.144, respectively. The calibration plot showed that the model had good calibration between predicted and actual values. DCA showed that the model was clinically useful within a threshold range of risk of death of 0.03–0.38.
Conclusion
Our study preliminarily confirmed that the SFHF model has good accuracy and generalizability in predicting the one-year survival rate of fragility hip fracture patients, and that it has good clinical value. This predictive model may be considered for local clinical practice.
An investigation of the longitudinal association of ownership of mobile phone and having internet access with intimate partner violence among young married women from India
Authors: Thakkar Shriya , Muhammad T. , Maurya Chanda 
Published: November 2022

Abstract
Purpose
We explored the prevalence of intimate partner violence (physical, sexual and emotional) and its longitudinal associations with the ownership mobile phone and internet access among married women within the context of India.
Methods
We used data from longitudinal survey “Understanding the Lives of Adolescents and Young Adults” survey (2015-16 and 2018-19). Descriptive and random effect regression analysis was used find out the respective results.
Results
The findings show that ownership of mobile phones and internet access rose from 36.2% and 3.7% in wave-1 to 54.3% and 27% in wave-2 respectively. However, despite increased ownership of technology, victimization as all forms of violence increases over time. It was found that women who owned mobile phones were significantly inversely related to the physical [Coef: -0.041; p < .001] and sexual [Coef: -0.024; p < .001] violence, compared to those who had no mobile phones. Women who had internet access were negatively associated with physical [Coef: -0.024; p < .001], emotional [Coef: -0.024; p < .001], and any form of violence [Coef: -0.024; p < .001] than their counter-parts.
Conclusion
The study findings underlined that internet and mobile phone services have been consequential in enhancing immediate safety and security in women’s lives. The results are important to practitioners, as they indicate that digital literacy among women should be promoted with immediate effect through the dissemination of workshops as well as strengthening access to mobile phones and internet. This, in turn, would be a huge boost towards women’s economic and social empowerment, particularly within the contemporary Indian context.