bluuebunny/crossref_metadata_2025 huggingface dataset:
D-dimer Trends Predicts COVID-19 Patient’s Prognosis: A Retrospective Chart Review Study
Authors: Kabir Raeed , Malik Iyana , Chen Reena , Nahar Jebun , Chen Xiongying , Hoq Mahfouz , Kabir Azad
Published: April 2023

Abstract: This is a retrospective study of patients admitted to Jackson Hospital, Montgomery, Alabama with a diagnosis of COVID-19 from January 1, 2021, to February 15, 2022. The independent variable used in the models were patient sex, age, race, BMI category, daily D-dimer categories, categories of anticoagulation doses (Enoxaparin 40 mg VS. Enoxaparin 80 mg VS Enoxaparin 1mg/kg or equivalent), bleeding episodes, and vaccination status. The three different categories of anticoagulation doses were considered for the purpose of the study. Results: The study reviewed a total of one hundred (100) hospitalized patients. Intermediate-dose anticoagulation was found to be the optimal dose as only fourteen percent (14%) patients died compared to a thirty-six percent (36%) and fifty percent (57%) death rate among those treated with low-dose and high-dose anticoagulation, respectively. The multivariate linear regression model predicting patient oxygen requirements revealed D-Dimer and bleeding status to be statistically significant predictors with a p value of <0.01. For the patients who had a D-dimer value ≥ 2 µg/mL, the oxygenation requirement was predicted to be 31 L higher than those with a D-dimer <2 µg/mL (99% CI; p<0.01). When mean D-dimer and corresponding oxygen requirements were calculated per hospitalization days category, the D-dimer levels and oxygen requirements were noted to follow the same trends indicating both values tended to increase and decrease simultaneously. Conclusion: The study concludes daily D-dimer trends can predict COVID-19 patient survival or daily oxygen requirements indicating D-dimer can be the miracle molecule for COVID-19 prognosis.
Coupling and Coordination Relationship between Urbanization Quality and Ecosystem Services in the Upper Yellow River: A Case Study of the Lanzhou–Xining Urban Agglomeration, China
Authors: Zhao Wusheng , Shi Peiji , Wan Ya , Yao Yan
Published: April 2023

The study of man-land relationship in urbanization process is the current frontier and focus of international research. How to balance urban development and ecosystem conservation in the Upper Yellow River is a key issue for sustainable development in China. In this study, we evaluated the Lanzhou-Xining urban agglomeration （LXUA）by constructing a multi-dimensional assessment system for urbanization quality and ecosystem services. The efficacy function model, entropy weight method, and Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) model were used to quantitatively assess the subsystems' state of development. Then, the coupling model (CD) and the coordination degree（CCD）model were used to explore the coupling coordination relationship and spatial-temporal change characteristics of the composite system. The findings indicate that: 1）In 2020, the quality of urbanization in LXUA showed the pattern of "double core". The development of urban centers in each city is insufficient, and the proportion of counties with low-level is too high. 2）Integrated ecosystem services showed an increasing distribution pattern from the northeast to the southwest. Water provision services, soil conservation services and carbon fixation services all showed growth trends. 3）Each county’s composite system was in the run-in stage or highly coupled stage. The subsystems were closely related to each other. 4）The CCD was decreased by 6% between two decades. The number of counties on the verge of disorder was the highest. About 80% of the counties are relatively lagging behind in ecosystem services.
Modelling Irradiation Effects in Metallic Materials using the Crystal Plasticity Theory
Authors: Frydrych Karol
Published: April 2023

The review starts by highlighting the significance of nuclear power plants in contemporary world, especially its indispensable role in the global efforts to reduce CO2 emissions. Then, it describes the impact of irradiation on microstructure and mechanical properties of reactor structural materials. The main part provides the reader with a thorough overview of crystal plasticity models developed to address the irradiation effects so far. All three groups of most important materials are included. Namely, the Zr alloys used for fuel cladding, austenitic stainless steels used for reactor internals and ferritic steels used for reactor pressure vessel. Other materials, especially those considered for construction of future fission and fusion nuclear power plants, are also mentioned. The review pays also special attention to ion implantation and instrumented nanoindentation which are a common way to substitute costly and time-consuming neutron irradiation campaigns.
IMPLEMENTASI PELAYANAN ADMINISTRASI KEPENDUDUKAN BERBASIS APLIKASI SISTEM INFORMASI DAN KONEKSITAS DESA (SIKDES) DI KANTOR KEPALA DESA TAMPIRWETAN
Authors: Rahayu  , Pratama Rohmawan Adi , Yuniva  , Islamiyah
Published: April 2023

People as citizens have the right to optimally obtain services from the government, such as administrative services, goods and services. The most basic service organized by the village government is service in the field of population administration, this is because it involves legitimacy as a citizen and is an inherent identity in one's life. In 2017, the Magelang Regency government provided free facilities in the form of an Information System and Village Connectivity application or commonly called SIKDES. The SIKDES application is based on the main data of the Magelang Regency Population and Civil Registry Office which aims to provide accurate and effective population data services because the system is based on information technology. This study aims to examine and determine administrative services through the SIKDES application as well as the obstacles and levels of community satisfaction with administrative services in Tampirwetan Village, Candimulyo District. This research is a qualitative descriptive study with data collection in the form of documentation studies, observations, and interviews. The results showed that the use of the SIKDES application greatly facilitated village officials in serving the community more efficiently. So that it creates community satisfaction, compared to the manual service process.
UPAYA KPU KOTA SEMARANG DALAM MENINGKATKAN PARTISIPASI POLITIK PADA PEMILIHAN WALIKOTA SEMARANG DI MASA PANDEMI PANDEMI COVID-19
Authors: Muchamad Priyo Utomo  , Sri Suneki
Published: April 2023

Terlaksananya pemilihan Walikota Kota Semarang di masa pandemic Covid-19 merupakan hal yang baru bagi penyelenggaraan pemilihan kepala daerah di Kota Semarang sejak pertama kali diselenggarakan secara langsung pada tahun 2005. Maka dengan adanya pandemic Covid-19 perlu adanya pemberian pengertian kepada masyarakat untuk tetap menggunakan hak pilihnya walaupun dihadapkan dengan krisis Kesehatan. Penelitian ini bertujuan untuk mengetahui tentang upaya KPU Kota Semarang dalam meningkatkan partisipasi politik pada pemilihan Walikota Semarang 2020 di masa pandemi Covid-19. Metode penelitian yang digunakan adalah deskriptif kualitatif. Dari penelitian ini dapat dijelaskan bahwa KPU Kota Semarang mengupayakan beberapa hal untuk mengedukasi masyarakat agar tetap memilih di masa pandemic ini, yaitu dengan memfokuskan pada kegiatan sosialisasi, sosialisasi yang dilaksanakan dengan berpedoman bahwa setiap kegiatan haruslah menghindari kontak fisik dengan masyarakat dan mengindari adanya kerumunan. KPU Kota Semarang menginiasi dengan kegiatan sosialisasi berbasis digital seperti mengencarkan kegiatan lewat postingan di media social milik KPU. Untuk menarik peran aktif masyarakat, KPU Kota Semarang juga menyelenggarakan program seperti virtual bike, wayang kulit virtual serta konser music virtual. Kegiatan sosialisasi KPU dapat dikatakan berhasil karena jumlah pemilih pada pemilihan Walikota 2020 mencapai angka 68.30% lebih tinggi dari tahun tahun sebelumnya walaupun dihadapkan pada pandemic Covid-19
PENGARUH EFIKASI DIRI DAN PENGENALAN LAPANGAN PERSEKOLAHAN (PLP) TERHADAP MINAT MENGIKUTI PPG PADA MAHASISWA PENDIDIKAN ADMINISTRASI PERKANTORAN FKIP UNS
Authors: Hanifiani Niqmah Ida , Murwaningsih Tri , Akbarini Nur Rahmi
Published: April 2023

Tujuan penelitian ini untuk mengetahui 1) pengaruh efikasi diri terhadap minat mengikuti PPG; 2) pengaruh Pengenalan Lapangan Persekolahan terhadap minat mengikuti PPG; 3) pengaruh efikasi diri dan Pengenalan Lapangan Persekolahan secara simultan terhadap minat mengikuti PPG. Penelitian ini merupakan penelitian kuantitatif dengan populasi seluruh mahasiswa Pendidikan Administrasi Perkantoran angkatan 2018 sebanyak 72 mahasiswa. Teknik pengambilan sampel menggunakan teknik sampel jenuh. Uji validitas instrumen menggunakan korelasi product moment dan uji reliabilitas menggunakan koefisien Cronbach’s Alpha. Uji prasyarat menggunakan uji normalitas, uji linieritas, uji multikolinieritas, dan uji heteroskedastisitas. Pengujian hipotesis menggunakan uji t, uji F, regresi linier berganda, koefisien determinasi, sumbangan efektif dan sumbangan relatif. Hasil penelitian menunjukkan bahwa 1) terdapat pengaruh positif dan signifikan efikasi diri terhadap minat mengikuti PPG dengan hasil thitung 7,514 > ttabel 1,995 dan nilai signifikansi kurang dari 0,05 (0,000 < 0,05); 2) terdapat pengaruh positif dan signifikan Pengenalan Lapangan Persekolahan terhadap minat mengikuti PPG dengan hasil thitung 2,014 > ttabel 1,995 dan signifikansi kurang dari 0,05 (0,048 < 0,05); 3) terdapat pengaruh positif dan signifikan efikasi diri dan Pengenalan Lapangan Persekolahan secara simultan terhadap minat mengikuti PPG dengan nilai Fhitung 31,520 > Ftabel 3,128.
STRATEGI PRESERVASI DAN KONSERVASI BAHAN PUSTAKA TERCETAK DI PERPUSTAKAAN STIE AUB (ADI UNGGUL BHIRAWA) SURAKARTA
Authors: Ilmi Bachrul , Sulistyoningtyas Natasia
Published: April 2023

Penelitian ini bertujuan mengidentifikasi strategi penanganan perbaikan kerusakan bahan pustaka tercetak beserta faktor penyebab kerusakan dan kendala yang dihadapi pustakawan. Penelitian ini dilakukan dengan pendekatan kualitatif menggunakan studi literatur, observasi, dokumentasi, dan wawancara. Analisis data dilakukan dengan tahapan reduksi, penyajian data dan penarikan kesimpulan. Hasil penelitian menunjukkan bahwa strategi Perpustakaan STIE AUB untuk mencegah dari kerusakan tersebut antara lain memperbaiki cover yang terlepas, perbaikan halaman yang robek, dan perbaikan label buku yang rusak. Masih ditemukan beberapa faktor yang mengakibatkan kegiatan pelestarian tidak berjalan dengan maksimal, yaitu kurangnya pustakawan ahli preservasi, belum adanya kesadaran pemustaka menjaga kondisi fisik bahan pustaka, tidak ada alokasi anggaran, serta belum ada ruangan, alat, dan bahan pendukung kegiatan preservasi bahan pustaka tercetak. Walaupun terdapat hambatan, perpustakaan dapat memaksimalkan alat dan bahan minimum yang dimiliki perpustakaan untuk preservasi bahan pustaka tercetak secara maksimal. Strategi ini dapat digunakan untuk perpustakaan dengan keadaan yang serupa.
Blended learning strategies through guided inquiry learning settings to increase learning acquisition of concepts and procedures in biology subjects
Authors: Dama Lilan , Nurrijal Nurrijal
Published: April 2023

The application of blended learning strategies through guided inquiry learning arrangements aims to increase the acquisition of students' learning concepts and procedures on the material of the body's defense system. The purpose of this study was to examine the effect of blended learning strategies with guided inquiry learning settings on the acquisition of learning concepts and procedures in biology subjects in high school. This test was carried out using a pre-experimental one group pre-test and post-test design, in this design:a) measurement of dependent variables from one group of subjects (pretest), b) subjects were given treatment for a certain period of time (exposure). , c) the second measurement (posttest) was carried out on the independent variables, and d) comparison of the results of pretest and posttest measurements. This study involved 36 students of second grade of Science class 3 of Public Senior High School 3 Gorontalo, consisting of 22 women and 14 men. The results of this study are; (1) Provide scientific experience so that it can become the best practice for fostering student teacher candidates. (2) Contribute directly to schools through teacher partnerships in finding the right learning mode. (3) The blended learning strategy of guided inquiry learning settings is very good in giving effect to increase the acquisition of learning concepts and procedures of students on the material of the body's defense system in Biology subjects in high school.
Asynchronous project-based learning: Is it effective in biology learning process?
Authors: Prajoko Setiyo , Sukmawati Ika , Pamungkas Sekar Jati , Permadani Karunia Galih , Alamsyah Muhammad Radian Nur , Darmawan Ericka
Published: April 2023

This study aims to determine the effectiveness of the Project-Based Learning model conducted via online (e-PjBL) on the concept understanding of evaluation in the biology learning. A quasi-experimental method with a non-equivalent pre-test and post-test group design is chosen in this study. The research is carried out at the Biology Education Study Program of Universitas Tidar in March - June 2021. A total of 63 college students become the sample in this research which are divided into experimental class and control class. The instrument used to collect the data is in the form of a concept understanding test about the evaluation of biology learning. Then, the results of the data are analyzed by quantitative. The results show that there is no difference in the use of online Project-Based Learning models on the concept understanding of evaluation in biology learning. This is indicated by the results of hypothesis test which is 0.184 > 0.05. Meanwhile, the average N-Gain in the experimental class is 0.2083 which belongs to the ineffective category. Next, several factors become obstacles to the online Project-Based Learning that causes this learning model to be ineffective.
Research trends on biology digital modules: A bibliometric analysis
Authors: Suwandi Tri , Rahmat Adi , Jamil Muhammad Wafda , Nurkhalishah Siti
Published: April 2023

Currently there is widespread interest in the use of digital modules for learning. The availability of studies on research trends and development of digital modules, can be a need analysis for further development of digital modules. Therefore, this bibliometric analysis was conducted to explore research trends on biology digital modules over the last decade. The data used in this study are Google Scholar indexed articles in 2012-2022. A search through the Publish or Perish (PoP) application using the keywords "modul digital" OR "digital module" OR "e-modul" from 2012-2022 obtained 988 results, then the remaining 41 articles were analyzed using Microsoft Excel to analyze the data descriptively and VOSviewer to obtain bibliometric mapping visualizations. Based on a bibliometric analysis study in the area of biology digital modules , it is known that publications about biology digital modules have been recognized since 2015 to 2022, reaching a peak in 2021, and most of them come from Indonesia. The most widely applied type of research is R&D involving high school students. Critical thinking skills are one of the 21st century skills that are most widely included in biology digital modules . Network visualization shows that there are 45 terms that are relevant to the digital biology module and are grouped into 3 clusters. The overlay visualization shows that "STEM" is a term that will appear in the 2022s. Density visualization shows that "e-module", "research", and "development" are the 3 terms with the highest density. The findings of this study are expected to be a reference for other researchers in optimizing the role of digital modules to support student learning.
INTEGRACIÓN Y DESPLIEGUE CONTINUO CON DEVOPS COMO CULTURA EN EMPRESAS DEL SECTOR TI COLOMBIANAS
Authors:   Corporación Universitaria Republicana, Cruz González Gilberth Nick , Franco Calderón José Alejandro
Published: April 2023

La integración y despliegue continuo son prácticas que han permitido que el ciclo de desarrollo de software se comporte de una manera más ágil, esto gracias a que constantemente brindan la posibilidad de automatizar procesos con el fin de mejorar tiempos y calidad. Este tipo de prácticas requieren de conocimiento y en la mayoría de los casos algún proveedor que cuente con herramientas y recursos con los cuales se puedan realizar dichas automatizaciones, es por esta razón que las empresas colombianas cuentan con opciones para todo tipo de objetivos y presupuestos económicos, desde empresas mundialmente conocidas como lo son Amazon Web Services, Google Cloud Platform y Microsoft Azure, pero al mismo tiempo existen herramientas de código abierto con comunidades activas que son bastante conocidas y utilizadas como alternativas a estas grandes empresas como lo es el caso de Tekton, Jenkins, entre otros. Este artículo de revisión tiene como objetivo identificar cuáles son las ventajas, desafíos, herramientas, entre otros aspectos que caracterizan este fenómeno y por qué ha crecido de tal manera que las empresas buscan opciones para implementarlo, al finalizar este artículo se lograron identificar diferentes herramientas y casos de éxito que brindan seguridad a futuras empresas que pretenden continuar con el mismo camino de tecnologías aplicadas con el fin de buscar el cambio teniendo como base nuevas formas de operar un mismo proceso.
Critical Review on New Indonesia Law on Labour Rights
Authors: Hermanto Memed , Purwaningsih Sri Budi
Published: April 2023

After the promulgation of Law Number 11 of 2020 concerning Job Creation on November 2, 2020, many academics and practitioners considered material and formal defects who studied this issue. 2003 concerning Employment. So that the problems that arise related to the legal protection of workers' rights according to the Employment Copyright Act of labor clusters in the perspective of the East Java FSPMI, this is very far from the meaning of legal protection for workers. The purpose of this study is to examine the basic reasons for trade unions/labor unions in rejecting Law Number 11 of 2020 concerning Job Creation (employment clusters). The method used in this research is socio-legal which examines the perception and behavior of humans and legal entities that occur in the field, which emphasizes the importance of empirical observation, observation and analytical steps. The conclusion of this research is that when the Employment Copyright Law is enacted, there are still many shortcomings and weaknesses that tend to be detrimental to Workers/Labourers which of course has the potential to create new problems in industrial relations between employers and workers. Taking into account these conditions, it is clear that the position of workers/labourers does not have legal protection and there is a guarantee of justice in terms of protection of job security, protection of income certainty and protection of social security, this is far from the ideals of the spirit of labor law to provide protection for all workers and their families.
Implementation of Law No. 2 of 1960 concerning the Implementation of Profit Sharing in Putat Village, Tanggulangin District, Sidoarjo Regency
Authors: Ayzudin Rifqi
Published: April 2023

In its development, the production sharing agreement was then regulated by Law Number 2 of 1960 concerning Production Sharing agreements that were born based on customary law in Indonesia. The problem in this paper is how the implementation of Law Number 2 of 1960 Concerning Land Sharing Agreements in Putat Village, Tanggulangin District, Sidoarjo Regency and What is the profit sharing concept in Law No. 2 of 1960 gave the possibility for the application of custom mechanisms in Putat Village. This thesis uses an empirical juridical approach, primary data obtained through data collection in the field which is then supplemented with literature studies for later qualitative analysis. The implementation of Law Number 2 of 1960 concerning Agricultural Land Production Sharing Agreements in Putat Village, Tanggulangin District, Sidoarjo Regency has not been fully effective. The community tends to choose to implement it verbally. The inhibiting factor for the adoption of Law Number 2 of 1960 concerning Agricultural Land Product Sharing Agreements in Putat Village, Tanggulangin Subdistrict, Sidoarjo Regency is that most of the people are not aware of the provisions of the Agricultural Product Sharing Agreement stipulated in the Law This is due to the absence of socialization from village officials and related offices, lack of insight from the community due to low levels of education, the existence of bad habits from the community that underestimate any regulations related to agriculture.
Sistem Monitoring Dan Kontrol Motor Listrik Industri Menggunakan Internet Of Things (IoT)
Authors: Hanafi Irvan , Hunaini Fachrudin , Siswanto Diky
Published: April 2023

The electric motor plays an important role in an industry as a driver in a particular system, for example, rotating a pump impeller, fan or blower, moving a compressor, and lifting materials. The electric motor is sometimes called the "work horse" of industry. It is estimated that motors use about 70% of the total electrical energy in the industry. In making industrial motor monitoring and control systems using IoT with the blynk application, it works in showing the parameters of voltage, current, temperature, and RPM. The module consists of an electric motor, a DHT11 sensor, a PZEM004T sensor, an RPM sensor, and an ESP 8266 microcontroller. In the research conducted, the system made is capable of monitoring and controlling many modules. So that the overall monitoring and control system of electric motors in the company can be integrated into a system. In testing the voltage sensor with a measuring instrument there is an error value of 0.04%, while the current sensor has an error of 2.5%, followed by temperature testing there is an error of 1.8%. the RPM sensor parameter has a value of 1.17%. Remote manual control can be controlled using a smartphone with the blynk application so that the operator can immediately turn off the motor remotely if there is a problem or damage to the electric motor.
“PHILO-PHILIPPA”: TO THE EXCELLENT ORINDA: UN POEMA LAUDATORIO DEDICADO A KATHERINE PHILIPS POR OTRA MUJER, EN EL SIGLO XVII
Authors: García Calderón Ángeles
Published: April 2023

Autora de gran importancia en la poesía inglesa del siglo XVII, Katherine Philips atesora, entre otros méritos, el de haber sido alabada por Dryden, y celebrada por Cowley y Jeremiah Taylor, así como el de haber instaurado en la literatura inglesa femenina una tradición de escritos virtuosa y moral, reivindicada a su muerte por otras autoras relevantes.

Sin pretender ni buscar nunca halagos ni privilegios intelectuales durante su corta vida, sería no obstante ensalzada por escritores y personalidades tan importantes como The Earl of Orrery, The Earl of Roscomon, Abraham Cowley, James Tyrrell y Thomas Flatman. Además de todas estas alabanzas, Philips recibiría, como reconocimiento a su labor de escritora y traductora, un poema anónimo, se supone que escrito por una mujer irlandesa: “Philo-Philippa”: To the Excellent Orinda.

Basado en estas premisas el presente trabajo se articula en torno a tres ejes: a) la figura de la autora, b) un breve esbozo de la literatura encomiástica, c) la traducción del poema citado.
La traducción de textos médico-jurídicos: el parte de lesiones en maltrato infantil
Authors: Gallego López Sandra
Published: April 2023

A lo largo de las últimas décadas, el número de normas y disposiciones reglamentarias relacionadas con el ámbito biosanitario ha experimentado un aumento verdaderamente significativo. En consecuencia, las autoridades administrativas se han visto obligadas a crear géneros textuales más actuales que respalden y consoliden estas nuevas actuaciones. Se trata de documentos que, debido a su naturaleza, se ubican de forma simultánea en los campos legal y sanitario y que se denominan «textos médico-jurídicos». Dichos textos presentan ciertos rasgos formales y comunicativos que difieren en función del contexto cultural y lingüístico y que, por ende, repercuten en el proceso de traducción. Es lo que conocemos como «convenciones textuales». En el presente trabajo situaremos el punto de mira en los menores de edad para analizar uno de los géneros médico-jurídicos más desconocidos en el mundo de la traducción: el parte de lesiones en maltrato infantil. De este modo, estudiaremos las convenciones textuales que lo configuran en la combinación lingüística alemán-inglés-español, con el objetivo de identificar y resolver posibles problemas de traducción.
Reseña: Vidal Claramonte (2022). ISBN:978-1-032-21165-7. DOI: 10.4324/9781003267072.
Authors: Skopos Editor de
Published: April 2023

Reseñas del volumen 13 (2022)
Trabajos de Investigación 2022
Authors: Skopos Editor de
Published: April 2023

Trabajos de investigación del número 13 (2022)
Optimizing Rod Pump Performance Using High Frequency, High Resolution Pressure Data at the Wellhead
Authors: Vekved Kerry , Ito Tokunosuke , Gordon Ryan
Published: April 2023

This is part of a case study designed to confirm that high frequency, high resolution pressure data measured at the wellhead of a pumpjack well can be used to evaluate and optimize the performance of the downhole pump. This paper will provide the rationale for the concepts and methods that will be used and tested during field trials of this approach.

For the field trials, participants are installing high-performance pressure monitoring devices on the tubing of rod pump wells upstream of the flow line check valve. Additional devices are being installed on the flow line. These Internet of Things (IoT) devices are rated for Class I, Division 1 hazardous zones, measure pressure at one-second intervals, and have a pressure resolution of 0.006 psi. The per-second pressure measurements are also time-synchronized and temperature-compensated for accuracy and will be delivered to a cloud-based data service over the course of several weeks.

For each well, the difference in pressure between the tubing and flow line will be analyzed in five-minute data windows. The pressure differential from each five-minute data window will provide a clear picture of the pressure the pump exerts on the flow line over the course of an average pumping cycle during that interval. Because pressure can be used as a proxy for flow, fill and efficiency at the bottom hole pump can be deduced from the calculated flow profile at surface, eliminating the rods and their associated error as the conduit of pump performance data. Assessments of pump performance using this technique will also be compared to results from production tests to determine how effective this technique is in evaluating rod pump performance. The large sample of five-minute data windows collected over the course of a month will test the technique against varying operational conditions. Furthermore, we will determine if particular pressure trends, as outlined in this paper, correlate with certain pump conditions during field trials, which would be of use for diagnosing pumping issues.

The approach of using high frequency, high resolution pressure measurement at the wellhead to assess downhole pump performance has shown promise in a previous case study (SPE-209253-MS). The current case study will add to the body of literature around this technique. Success with this technique would offer an economical alternative for monitoring rod pump performance of aging wells.
Slow-Release Downhole Chemical Treatment in Rod Pump, ESP and Gas Lift, Including a Non-Pulling Tubing Method of Installation
Authors: Chavarria Jose , Gonzalez Gustavo , Sanchez Donovan , Arias Renzo
Published: April 2023

The effect of traditional chemical treatments at the pump intake can be minimized due to the fluid level, high GLR, and production packers, among other reasons. Using a slow-release polymer matrix is an effective chemical treatment that was installed in several wells in the Delaware basin with Conoco Phillips. The chemicals were encapsulated in the matrix ensuring maximum absorption and then slow dispersion, and the tool was run under the intake of rod pumps, ESPs, and gas lifts.

In rod pumps, the installations were carried out by pulling the production tubing while in the Gas Lifts, the chemical tools were installed via slickline without pulling the BHA. In the gas lifts and rod pumps, the chemical tool can be replaced whenever the concentration levels reach the minimum effective concentration without pulling the tubing. To track the dispersion rate, the wells were sampled monthly to measure the concentration of scale and corrosion inhibitor and the amount of THPS downhole. The whole tracking history of the wells will offer valuable information about the chemical concentrations expected using downhole chemical treatment compared with the concentrations obtained while using surface treatments and the longevity of the treatment at the production rates and depths installed.

Corrosion and scale are some of the major issues in the Conoco Phillips field in the Delaware Basin. after installing the downhole chemical treatment in different wells, the KPIs determine stable conditions downhole without failures reported. The manganese and iron concentration remained stable in the wells assessed, the chemicals concentration has been above the MEC (minimum effective concentration) and the wells are still running. The main impact of these favorable conditions is the run time and the fact the total cumulative production increased compared to the same period before the installation.
Application of Machine Learning to Evaluate the Performances of Various Downhole Centrifugal Separator Types in Oil and Gas Production Systems
Authors: Osorio Ojeda Laura Camila , Olubode Michael , Karami Hamidreza , Podio Tony
Published: April 2023

Pumping artificial lift techniques, such as rod pumps and ESPs, are applied for gassy wells more than ever before. This has made the downhole separators a critical part of most such installations. There are multiple categories of downhole separators, with various techniques developed to assess and improve their performances, but no general guidelines are established for their application. This paper aims to classify the separator types and review their performances in the open literature. In addition, various data sets are collected and put together to evaluate and rank downhole centrifugal separators using data analysis and machine learning (ML) techniques.

A comprehensive literature review is conducted to collect the available downhole separator performance data. Experiments and Computational Fluid Dynamic (CFD) simulations are the techniques used by the researchers. This information is collected to identify the optimum conditions for each separator type, considering the effects of liquid and gas rates and other flow parameters. The data collected from various research projects over the last 20 years are combined to make a comprehensive downhole separation databank. These data are analyzed using various machine learning algorithms to rank the performances of downhole separators at various operating conditions.

Various downhole separators have been tested in the open literature, including poor-boy separators, two-stage separators, packer-type separators, rotary and spiral separators with different designs, etc. A critical factor that adds to the uncertainty is the separator's control system, which significantly affects its efficiency. The available data show that most separators provide separation efficiencies higher than 80% if the downstream casing valve is adequately controlled. The separation efficiencies decline as the liquid and gas rates increase past an upper limit. The collected data from multiple previous studies form a broad dataset. Data analysis is used to compare the performances of different downhole separator classes, and machine learning is applied to identify a robust prediction model. This paper gathers, interconnects, and examines several available research works through data analytics. The results provide a fundamental source and a valuable guideline for downhole liquid-gas separation, particularly in artificial lift applications.
A Robust Screening Tool to Repurpose Hydrocarbon Wells to Geothermal Wells in Oklahoma
Authors: Ugarte Esteban R. , Salehi Saeed
Published: April 2023

Geothermal energy is a renewable energy that has vast potential due to its reliable energy supply. Its development has been related to specific geological locations with extremely high temperatures. However, depleted oil and gas reservoirs can produce geothermal energy from the subsurface. Repurposing this well can be a valuable tool to generate sustainable and steady energy for the state of Oklahoma due to its large number of wells used in the Oil and Gas industry. In fact, abandoned oil and gas wells are suitable candidates for conversion as these are environmental liabilities. The challenge is selecting which wells are good candidates for geothermal applications. This study aims to build an evaluation methodology to filter wells with a high potential for geothermal production. Three factors, temperature, proximity to the end user, and well integrity, are analyzed for evaluating possible candidates. Three datasets of temperature gradients were gathered from the Oklahoma Geological Survey, abandoned oil and gas wells from the Oklahoma Corporate Commission, and cities’ locations and populations from the US Census Bureau were combined. The objective is to evaluate the wells in Oklahoma to select promising candidates for repurposing for geothermal applications. Temperature prediction was made using Spatial Interpolation using Thiessen polygons, K-nearest Neighbors, and Kriging. K-nearest Neighbors exhibited the highest performance based on the evaluation metrics. Temperature prediction at an average true vertical depth of 6000 ft showed 26.7% or 4292 wells have more than 150 °F and can be converted for geothermal production. The shortest distance heuristic algorithm was used to calculate the shortest distance of each well to any city in Oklahoma. Before conversion, an evaluation of the well is required to assess the volumes and condition of the well; methods include statical analysis, logging, and evaluation techniques. These are discussed in this study. This study shows the high number of wells with the potential to be converted for geothermal applications converting a liability and environmental concern to a renewable energy-producing asset.
Geomechanical Study and Wellbore Stability Analysis for Potential CO2 Storage into Devonian and Silurian Formations of Delaware Basin
Authors: Nguyen Son Truong , Nguyen Tan Cong , Yoo Hyunsang , El-kaseeh George
Published: April 2023

The objective of this project is to construct a 1D mechanical earth model for the prospective geological sequestration of carbon dioxide (CO2) into carbonate formations. The study sustains a pivotal role in analyzing the possible wellbore instabilities for drilling deep injection wells. Besides, the developed model can be essentially used to evaluate the caprock integrity for long-term CO2 storage and provide the primary analytical assessment of fault slip potential.

This paper describes the extensive construction of a geomechanical model to achieve three ultimate goals. A variety of petrophysical interpretations, shear wave velocity modeling, and Mogi-Coulomb failure criterion are initially established to deliver a safe drilling mud weight window for overpressure ramps in the Delaware basin, a sub-basin of the Permian. Using the dependable outputs of rock properties and strengths, top seal quality is subsequently determined by calculation of the brittleness index and critical pressure of tensile failure. Finally, pore pressure, shear stress, friction angle, and in-situ stresses are integrated to predict maximum sustainable injection pressures for preliminary fault slip analysis in deep aquifer carbonate rocks.

Two distinct overpressured zones of Wolfcamp and Barnett Shale are identified for wellbore instability based on pore pressure and fracture gradient prediction. These pressure ramps have a lower compressive strength, which causes the collapse pressure to exceed the pore pressure and serve as the lower bound of drilling mud weight. The wellbore stability simulation also shows low brittleness indices and high threshold breakdown pressures for Woodford shale caprock. It implies that the caprock may be more resistant to fracture growth and failure, indicating an effective top seal above the injected reservoirs. Meanwhile, close observation may be purposefully monitored to assess the fault slip potential in Devonian and Silurian formations once the critical injected fluid pressure approaches the projected threshold from the analytical computation.

The findings from this study will be useful in further understanding wellbore stability under drilling practices and CO2 sequestration. The appropriate application can support optimizing the casing and drilling mud weight design while also modifying the injection fluid pressure. Furthermore, the estimated rock properties, formation pressure, and principal stresses will be significant elements in building a hydrodynamic simulation of gas plume distributions after certain injection years.
Intentional Wet Shoetrack Completions for Unconventional Oil and Gas Resources: Methods and Techniques
Authors: Gundersen Anders , Gomez Ricardo , Kadler Chelsea , Broussard Taylor , Gandomkar Arjang
Published: April 2023

The shoetrack of an oil and gas well refers to the bottommost part of the casing string, from the bottom of the float shoe to the top of the landing collar, or to the top of the float collar if a landing collar is not used. A wet shoetrack is defined as the lack of competent cement in the shoetrack of a cemented completion string. In applications where a wet shoetrack is undesirable, the most important purpose of the shoetrack is to allow fluid to flow out of the casing string (casing to annulus) but prevent fluid from entering (annulus to casing). Control over fluid flow direction is achieved by multiple redundant one-way check valves installed in the shoetrack that only allow flow from casing to annulus. The one-way check valves also prevent the cement from flowing from the annulus and into the casing at the end of the cement job in a phenomenon called U-tubing. This occurs because the cement has a higher density than the displacement fluid resulting in a differential pressure acting from the annulus to the casing. The ability to prevent fluid from entering the casing string, together with other equipment such as a blowout preventer, enables well control while installing and cementing the casing string.

A wet shoetrack in oil and gas well construction has historically been both unintentional and undesirable. In the best case, it was a minor inconvenience, while in the worst case it was a critical Health, Safety and Environment (HSE) risk. Costly remediation operations, such as a cement squeeze, might have been required to establish a competent shoetrack before continuing with subsequent operations.

The practice of completing the production casing strings in low-permeability unconventional oil and gas formations with intentional wet shoetrack completions started to take off in the early 2010's in the USA, especially on 4-1/2″ liners in the Bakken Formation, but soon also in the DJ-Basin, Permian and SCOOP/STACK formations. The growing popularity was driven by the need to cost-effectively pump down the first stage of plug and perf completion, and the significantly reduced well control risk compared to higher permeability conventional oil and gas formations. Intentional wet shoetrack completions soon became a real alternative to tubing conveyed perforation, sand jetting, and pressure-actuated atmospheric ("air") chamber sliding sleeves ("toe sleeves") to create the injection path for the first stage of plug and perf completion.

This paper aims to describe the different methods and techniques used to create intentional wet shoetracks on longstring and liner production casing strings in low-permeability unconventional oil and gas formations.
An Efficient Hydraulic Fracture Geometry Calibration Workflow Using Microseismic Data
Authors: Bachi Hana , Wu Jianfa , Liu Chuxi , Yang Xuefeng , Chang Cheng , Yu Wei , Sepehrnoori Kamy
Published: April 2023

Microseismic technology has proven its efficiency to monitor hydraulic fracturing effectiveness. The objective of this study is to develop a novel method to calibrate and generate the hydraulic fracture cluster-based model of a multi-stage horizontal shale well using the microseismic data. We use microcosmic numerical model known as Microseismic EDFM software feature (MSE-Frac) with the embedded discrete fracture model to simulate the hydraulic and natural fractures and the discrete fracture network. The MSE-Frac can handle the grouping of the clustered microcosmic events around the wellbore and generate a cluster-based model of the complex fractures network. Afterwards, we apply different factors on the hydraulic fractures, natural fractures, and the discrete fracture network to calibrate the fracture's geometry to match the historical data. This method allows us to determine the best parameters to be applied on this model to calibrate the hydraulic fracture geometry, and to find the fractures' characteristics for optimal production. Finally, we perform a production forecasting study for the next twenty years. Through this study, we develop a novel method to calibrate the complex hydraulic fracture geometry starting from the microseismic data. Four main parameters are investigated, namely, height and length cutoff, water saturation, compaction coefficient, and conductivity of the complex hydraulic fracture network. Multiple studies have been conducted to calibrate the geometry of the hydraulic fractures, but relatively less work is focused on utilizing the microseismic events even though they are largely available to most operators. Heretofore, there are no thorough studies on innovating a workflow to calibrate and position the fracture geometry starting from the microseismic events. Our models use more precise methodical approaches to simulate and calibrate the complex hydraulic fracture geometry based on microseismic events.
Optimization of Feed for Nile tilapia (Oreochromis niloticus) using an Excel Programming Model in Small-scale Feed-mixing Operations in Togo
Authors: BOMA Soudah , N'FEIDE Toï , LOMBO Yao , BATIMSOGA Bougra , KOSSOGA Assota , BATAKA Koutera , TOKO Ibrahim IMOROU , OMASAKI Simon Kipkemboi
Published: April 2023

This study aims to develop an Excel programming model to formulate feed for Nile tilapia (Oreochromis niloticus), mainly for small and medium-sized fish feed manufacturers. The model allows users to formulate the least costly balanced diet of Nile tilapia species, giving them the ability to choose a specific ingredient in the formulation according to the realities of the local environment: space-temporary availability of ingredients, prices and nutritional quality. Computer programming of a database of 25 locally available feed components was carried out using the Excel Solver Add-in and Excel IF mathematical functions to incorporate/delete specific ingredients in real time in accordance with user objectives. The theoretical characteristics of the least-cost balanced diets performed were within the margin of the nutrients requirement of the target fish size with protein levels of 35 per cent (fry diet: $1.07), 32 per cent (fingerlings diet: $0.48/kg), 29 per cent (growth diet: $0.43/kg) and 27.12 per cent (final diet: $0.39/kg). The digestible energy of these diets was between 3016.5 ± 93.8 kcal. In addition, the model shows that an increase in soya meal prices by 75 per cent led the local feed industry to rely on imported fish meals, as the number included reached 52.28 per cent. However, the cost of the diet margin did not vary significantly. Nevertheless, it would be important to test the balanced diet developed with the model before production and scaling.
Evaluation of GnRH antagonist pretreatment before ovarian stimulation in a GnRH antagonist protocol in women with poor ovarian response undergoing IVF/ICSI: A retrospective propensity-score-matching study
Authors: Zhang Yisheng , Li Ning , Qin Jie , Liu Liling , Huang Hongyi , Xue Lintao , Tan Weihong
Published: April 2023

Backgroud: A low number of retrieved oocytes significantly affects the clinical pregnancy rate (CLR) in patients with a poor ovarian response (POR).The aim of this study was to assess the effect of GnRH antagonist（GnRH-ant） pretreatment performed on days 2 to 4 of the menstrual cycle on pregnancy outcomes in women with POR undergoing in vitro fertilization/intracytoplasmic sperm injection (IVF/ICSI).
Methods: We conducted a retrospective study of 208 women with POR undergoing IVF/ICSI from January 2018 to August 2021. The pretreatment GnRH-ant protocol (study group) comprised 32 patients, and the conventional antagonist protocol (control group) included 176 patients. A propensity-score-matching (PSM) method using nearest neighbour matching at a proportion of 1:3 was performed. After PSM, we compared the pregnancy outcomes of each group.
Results: After PSM, there was no significant difference in age, antral follicle count (AFC), AMH level, or gonadotropin (Gn) level between the two groups (P>0.5). There were no significant differences in the number of retrieved oocytes, mature oocytes, normally fertilized oocytes, transferable embryos, and good-quality embryos between the two groups (P>0.05). There were no significant differences in biochemical and clinical pregnancy rates between the two groups (P>0.05). The implantation rate [34.4% (11/32)] and live birth rate [50.0% (8/16)] of the studygroup were higher than those of the control group [15.5% (9/58), P=0.039; 13.8% (4/29), P=0.014].
Conclusions: Treatment with a GnRH antagonist on day 2 to day 4 of the menstrual cycle did not increase the number of retrieved oocytes or the clinical pregnancy rate in women with POR undergoing IVF/ICSI, but it may increase the live birth rate.
Trial registration: Chinese Clinical Trial Registry, ChiCTR1800019730.
A comparative study on stochastic multiscale analysis of composite laminates
Authors: Bhattacharyya Rudraprasad
Published: April 2023

The progressive damage analysis of fiber composites is performed using deterministic field variables precluding the consideration of natural variability in material manufacturing. Even with high quality control techniques employed by manufacturers, there are sources of variability in the material at different spatial scales. The natural variability at microscale within the material is modeled using (1) random field approach, (2) incorporating spatially varying micro-defects. In both the approach same sampling-based non-intrusive method was adopted to incorporate aleatory uncertainty in a concurrent multiscale modeling framework. A comparison between the approaches to predict ultimate strength and stiffness of laminates is presented. Both unnotched and open-hole quasi-isotropic laminates were analyzed for validation.