bluuebunny/crossref_metadata_2025_split huggingface dataset:
Beatriz González, o el recortar y cortar
Authors: Reyes Gómez Álvaro Daniel 
Published: May 2024

Sobre la obra de Beatriz González.
Beatriz González (1932)
Beatriz González es un referente en el arte colombiano. Como artista se ha dedicado a examinar con una mirada incisiva la historia y memoria de Colombia. Ha tenido además un importante trayecto como investigadora y curadora, enfocándose en particular en la caricatura y el siglo XIX en Colombia. En una trayectoria de más de 50 años ha expuesto nacional e internacionalmente; entrado a conformar colecciones públicas como el Museo de Arte Moderno de Nueva York, la TATE Modern, y el Museo del Banco de la República entre otras, y trabajado en más de 15 publicaciones como catálogos, artículos y libros.

Agradecemos la colaboración de "Sextante galería. Arte Dos Gráfico Taller", del "Catálogo razonado Beatriz González - BADAC" de la Universidad de los Andes y, de manera especial, a la maestra Beatriz González y a Natalia Gutiérrez por permitirnos dialogar con su obra.
Sextante galería. Arte Dos Gráfico TallerCatálogo razonado Beatriz González - BADAC
Pembelajaran Berbantuan Aplikasi Graspable Math pada Materi SPLDV untuk Melatih Pemahaman Matematis Siswa
Authors: Taofik Agna Ilma , Priatna Nanang 
Published: May 2024

This study aims to describe the use of Graspable Math learning media in the material of the Two-Variable Linear Equation System (SPLDV) to train mathematical understanding skills. This study was conducted on 8th-grade students with as many as six people as subjects using a qualitative methodology. The instruments used were math comprehension test sheets and interview guidelines. The results of this study show that the Graspable Math application can be used as a practical medium for students' mathematics learning. This implies that the use of the Graspable Math application on SPLDV material at the junior high school level can help students' understanding of mathematics, especially in algebraic material which includes operations and substitution between tribes
Profil Guru Pancasila Ditinjau dari Filosofi Pendidikan Ki Hajar Dewantara
Authors: Sofiuddin Ahmad , Saputra Meidi 
Published: May 2024

Kurikulum Merdeka Belajar mengusung kemerdekaan anak atau peserta didik dalam proses pendidikan. Tujuan dari kurikulum Merdeka Belajar diterjemahkan ke dalam Profil Pelajar Pancasila yang memiliki enam dimensi. Selain Profil Pelajar Pancasila, terdapat Profil Guru Pancasila yang juga memiliki enam dimensi yang sama. Profil Guru Pancasila harus diimplementasikan oleh seorang pendidik dalam kurikulum merdeka belajar. Tujuan dari penelitian ini adalah untuk mengeksplorasi Profil Guru Pancasila dilihat dari perspektif pendidikan Ki Hajar Dewantara. Metode yang digunakan dalam penelitian ini menggunakan studi pustaka. Hasil penelitian menggambarkan bahwa enam dimensi Profil Guru Pancasila memiliki akar nilai yang dijunjung oleh Ki Hajar Dewantara dalam Sistem Among. Beberapa dimensi Profil Guru Pancasila terdapat dalam asas Sistem Among. Selain itu, dimensi-dimensi tersebut memiliki kesamaan makna dengan beberapa pesan yang pernah disampaikan olah Ki Hajar Dewantara. Hal ini menunjukkan selain memiliki akar nilai dari pendidikan Ki Hajar Dewantara, Profil Guru Pancasila sangat perlu untuk diwujudkan dalam perilaku guru sebagai seorang pendidik.
Kata kunci: profil guru Pancasila; sistem among; Ki Hajar Dewantara
Profile of Pancasila Teacher Viewed from Ki Hajar Dewantara's Philosophy of Education
The Merdeka Belajar curriculum advocates for the freedom of children or learners in the educational process. The objective of the Merdeka Belajar curriculum is translated into the Pancasila Student Profile, which consists of six dimensions. Besides the Pancasila Student Profile, there is also the Pancasila Teacher Profile, which shares the same six dimensions. The Pancasila Teacher Profile must be implemented by an educator within the Merdeka Belajar curriculum. The purpose of this research is to explore the Pancasila Teacher Profile from the perspective of education by Ki Hajar Dewantara. The method employed in this research is literature study. The research findings illustrate that the six dimensions of the Pancasila Teacher Profile have their roots in the values upheld by Ki Hajar Dewantara in the Among System. Several dimensions of the Pancasila Teacher Profile are found within the principles of the Among System. Furthermore, these dimensions share similar meanings with some messages previously conveyed by Ki Hajar Dewantara. This indicates that besides having its roots in Ki Hajar Dewantara's educational values, the Pancasila Teacher Profile is highly necessary to be realized in the behavior of a teacher as an educator.
Keyword: Pancasila teacher profile, among system, Ki Hajar dewantara
A Survey of the Plants of Orissa (India) for Tannins, Saponins, Flavonoids and Alkaloids-II
Authors: Brahmam M. , Saxena H. O. 
Published: May 2024

Phytochemical screening of 236 plant species from Orissa has shown the presence of tannins in 74,Â saponins in 14, flavonoids in 74 and alkaloids in 51 species. The presence of alkaloids in 13 species is reported for the first time. The tannin content of 32 species is found to be between 0.4 to 21.2 percent.
Assessment of methods for determining differences of rocket energy installations
Authors: Korobko Ivan , Pavlova Viktoriya 
Published: May 2024

The main objective of this work was to analyze main methods of measuring the thrust of rocket engines. It considers numerical and experimental (direct and indirect) method groups and an intermediate metjod group - computational and experimental, which combine the methods of both of the above categories.The work provides disadvantages and advantages of the indicated methods of registration of the differential thrust of rocket engines and considere its relevance. Solving the problem of estimating thrust asymmetry will make it possible to make changes and corrections in the operation of the rocket engine in advance.
Pengembangan Media Instagram Mengenai Jalur Seleksi Masuk Perguruan Tinggi Bagi Peserta Didik Sekolah Menengah Atas
Authors: Fauziah Bela Riesti , Badrujaman Aip 
Published: May 2024

Penelitian ini bertujuan untuk mengembangkan konten media Instagram mengenai jalur seleksi masuk perguruan tinggi. Penelitian ini menggunakan model design based research (DBR) dengan tiga tahapan inti yaitu, analisis dan eksplorasi, desain dan kontruksi, serta evaluasi dan refleksi. Populasi penelitian ini adalah peserta didik kelas 10 SMAN 81 Jakarta dengan jumlah sampel sebanyak 140 peserta didik yang didapat menggunakan metode non-probalility sampling. Pengumpulan data didapat dengan menggunakan penyebaran angket kepada peserta didik kelas 10 SMAN 81 Jakarta. Pengujian media Instagram dilakukan melalui dua uji ahli, yaitu uji ahli media dan uji ahli materi. Selain itu, pengujian media juga dilakukan melalui uji pengguna yaitu guru BK SMAN 81 Jakarta sebagai pengguna media bimbingan dan konseling. Hasil uji validasi ahli materi dengan persentase sebesar 64% dengan kategori layak, uji validasi ahli media dengan persentase sebesar 79% dengan kategori layak. Hasil uji coba pengguna kepada salah satu guru BK mendapatkan persentase sebesar 82% dengan kategori sangat layak. Dapat disimpulkan media Instagram mengenai jalur seleksi masuk perguruan tinggi dikategorikan layak digunakan.
Novel Approach to Cementing Production Liners in Deep HPHT Gas Wells with Narrow Subsurface Pressure Windows
Authors: Siddiqi F. , Fuentes R. , Elhancha A. , Masoud Zuleta R. 
Published: May 2024

Abstract
Cementing the production liners in the deep gas field in the Kingdom Saudi Arabia (KSA) has been incredibly challenging due to narrow pore-frac pressure windows resulting in higher well control risks. Hydraulic isolation becomes even more critical as the reservoir pressure is on the high spectrum. To mitigate these risks, reliable hydraulics simulations and flexible cementing fluids designs are needed to accurately manage the circulating pressures during cement placement.
When pore pressure is revised upward during drilling, mud weight cannot be further increased due to fracture pressure limitation and circulating pressures must be managed to maintain well control. Accordingly, the cement and spacer densities must be adjusted to fit the new drilling window. Wet addition of a special weighting agent featuring controlled fine particle size enables last minute slurry design adjustment without the need to switch blends. An Engineered Lost Circulation (ELC) spacer was designed to mitigate losses. A collaborative workflow between the surface auto-choke system and a field proven hydraulics simulator allowed pressure management during cement placement.
This innovative design and execution approach contributed to increasing the success rate of cementing some of the most critical production intervals in KSA. The added design flexibility helped save rig time by avoiding the need to proceed with a complete rework and prevented unnecessary blend disposals by allowing slurry adjustments thru wet addition of a special weighting agent instead of building a new blend. The ELC spacer solution was highly effective, giving confidence to proceed with the cement job without having to consume drilling fluids and rig time trying to cure losses upfront. More importantly, the successful pressure management methodology promoted well integrity assurance. The proven success track record encouraged other drilling departments in KSA to adopt the same approach when encountering similar challenges in their wells.
To the authors’ knowledge, the combination of these techniques has yet to be explored, particularly in the context of deep high-pressure high-temperature (HPHT) gas reservoirs. Notably, the existing body of literature lacks illustrations of such unique multi-disciplinary approaches.
Identify, Remediate and Verify Cross Sectional Cement Barriers for Permanent Well P&A
Authors: Zapata Bermudez F. , Troup D. , Roicki K. 
Published: May 2024

Abstract
The expectation for well barriers lasting for eternity and the need to reduce the cost on post-abandonment monitoring are a function of the abandonment method employed. As it currently stands, there exists a comprehensive set of guidelines and procedures that are intended to provide for permanent plug and abandon of wells, however we are proposing a 3-step workflow (IRV) to Identify areas of localized leaks with fluid/gas movements in A/B annulus by using a passive acoustic tool. Then to Remediate the well leaking section by setting a cross-sectional cement plug to create a rock-to-rock barrier, and finally to Verify the barrier by listening to potential liquid/gas leaks above the cement plug.
A permanent well abandonment dictates that there should be zero leakage to surface, but the current barrier philosophy is not sufficient to confirm it, as the procedure is to verify the placement of cement by a bond log, but not to evaluate for possible fluid/gas flow paths. On barriers, there is a dispensation that the length may be reduced from 50m to 30m if that is verified by a bond log. The value proposition for our workflow is to focus on the condition of the barrier, and to make emphasis on its ability to resist leakage.
Traditional barrier evaluation is based on a subjective interpretation of the response from an active acoustic logging tool. The "quality" of the cement is inferred from evaluating the response of sonic or ultrasonic measurements. The flaw in this approach is that there may be cases where an annular barrier conforms to location, length, and quality of cement but still exhibits annular pressure build-up. The uniqueness of this IRV workflow is to Identify the leakage in A or B annulus by listening to the noise events created by the leakage, then Remediate the well with a cross sectional cement barrier to finally, Verify the barrier with high-definition noise detection tools. The concept was tested by measuring cement sealing quality at DrillWell and P&A Innovation Programs, showing that the newest design of passive acoustic tools can detect flow of both liquid and gas down to extremely low levels. The well leakage was repaired by using the perf, wash and cement technique and injecting cement during a project test at NORCE in 2020-2021 called the PERFORM Project. Since then, several services have been successfully achieved.
In conclusion, the system is ready for deployment of the workflow for Identifying Sustainable annulus pressure (SAP) using the passive acoustic tool and mapping both gas and liquid annular flows, from within production tubing, then to repair the SAP by using the Perf, Wash, Cement technique to finally verifying the cement barrier integrity with the acoustic listening tool.
Tubing Retrievable Sub Surface Safety Valve Control Line Isolation Tool to Serve as a Downhole Barrier
Authors: Suleymanov Oktay , Aghazada Kamal 
Published: May 2024

The Tubing Retrievable Sub Surface Safety Valves (TRSSSV) are commonly deployed in drilling operations as a means to shut-in a wellbore in the event the integrity of a surface wellhead is compromised during operation. However, current Tubing Retrievable Sub Surface Safety Valves commonly experience a number of failures and malfunctions due to surface leaks at the Control Line Exit block. For instance, some Tubing Retrievable Sub Surface Safety Valves may fail to function as designed when Control Line Exit block losses integrity and hydraulic pressure within the control line is lost, which may lead to uncontrolled closure of Tubing Retrievable Sub Surface Safety Valves flapper during well production or so called "Slam Closure", causing significant wear or damage of the safety valve components, which over time may result in significant Tubing Retrievable Sub Surface Safety Valves wear or failure that leads to performing costly well workover to change out the valve as well as loos in production for the duration the well is shut in.
Therefore, a need existed for additional tools or methods capable of isolating the reservoir pressure and fluids from below the Tubing Retrievable Sub Surface Safety Valve to act as a downhole barrier for control line conduit, in order to perform required surface repair to the control line exit block for the duration of this operations.
Challenges and Solutions: Exploring Limitations of the Traditional Three-Media Model in Coated Casing Barrier Assessment Using Pulse Echo Tools
Authors: Egbe Peter I. , Azim Muhammad K. 
Published: May 2024

Abstract
There is always a need to evaluate cement bond quality behind casing strings. This is to confirm effective placement of circumferentially distributed hydraulic seal behind casing as required by well integrity life cycle cementing zonal isolation requirements. Historically this has primarily been achieved by ultrasonic pulse echo (PE) and sonic pad device tools.
Cement bond evaluation tools however face significant limitations in assessing downhole cement bond quality when the casing is externally wrapped with an anti-corrosion coating layer. The challenge to evaluate presence of cementing zonal isolation barriers in such scenarios is further highlighted when exotic light / ultra-light cement slurries are used. Currently, no ultrasonic logging service provider is known to offer a model accounting for four media logging (i.e. mud in hole – steel casing – anti corrosion coat – cement sheath behind casing).
It is believed that the impact of coated casing in the accurate evaluation of cement behind such casing strings is still not well understood within the industry. Its presence predominantly results in the underestimation of the measured acoustic impedance of cement behind the pipe, indicating potentially invalid free pipe assessments or suggesting poor cement quality presence in otherwise excellently bonded pipes. These findings could suggest misleading conclusions and subsequent erroneous and costly decisions, including invalid cement squeezes, side-tracks, or potentially even unnecessary well abandonment.
This paper introduces an approach tailored for accurate acquisition and interpretation of cement bond data behind FLINT coated and Fusion Bonded Epoxy (FBE) coated casings; thus, facilitating informed decisions in well construction and completion projects.
Cost and Operational Optimization of Utilizing FMH Wellhead System
Authors: Alghamdi M. , Alalyani A. 
Published: May 2024

Abstract
The conventional wellhead (WH) system with slip-on weld and slip-type hangers has been in the industry for several decades as it is simple and straightforward. However, the system entails and imposes certain risks and excessive time that cause unnecessary additional costs. This paper will discuss the differences between the conventional wellhead system and the Fluted Mandrel Hanger (FMH) system and the optimization opportunities that FMH system promotes.
The FMH system uses a mandrel that sets once it lands on the load shoulder on the internal profile of the wellhead and has flutes that facilitates returns to the surface. To prevent damaging the internal profile, before drilling, a wear bushing must be installed due to the delicacy of the system. After drilling the hole section to casing point, a rat hole of 5 - 10 ft is maintained to ensure safe and smooth landing of the FMH. After landing, the cementing operation can be commenced and then the Pack-off can be set and tested. The FMH system has proven its efficiency and cost-effectiveness in comparison to the conventional system. To elaborate, in a dual stage cementing job, the WOC time on the first stage to lift the Well Control Equipment (WCE) is eliminated which saves rig time, leading to considerable cost savings especially in offshore rigs. Moreover, the system provides and promotes safer operations by eliminating cutting or dressing since the casing stub of the FMH is a standardized design that fits through the next casing or tubing spool. In addition, it eliminates an extra step of lifting the diverter or Blowout Preventer (BOP) to set the slip-type hanger on the casing.
Innovative Technologies for Rigless Well Integrity Surveillance and Control: Integrating Smart Barrier Systems and Industry 4.0 in Annulus Pressure Control
Authors: R Dsouza. , P Patela. , K Wichrowski. 
Published: May 2024

Abstract
Globally, hundreds of wells each year face challenges related to unplanned sustained annulus pressure (SAP). Operators need to invest significant costs, time and face HSE risks to either fix the SAP issue or put in place risk reduction measures to operate these wells under dispensation, in order to avoid workovers, production deferment or inactive strings.
This paper presents an innovative solution aimed at optimizing well integrity and production efficiency for operators facing problematic sustained annulus pressure (SAP). By combining efforts to minimize inactive well strings and enhance real-time surveillance, the solution focuses on increasing well availability while reducing intervention costs. The technology restores double barrier integrity at the surface, provides reliable and real-time annulus pressure and temperature data, and autonomously manages the SAP pressure within predetermined thresholds.
This approach enables a comprehensive understanding of SAP, facilitating the continued production of wells that would otherwise require workover, thus contributing to production quotas and improving HSE standards.
The impact of fireworks ban relaxation on variations in SO2 emissions in China during the 2023 Chinese New Year
Authors: He Xinyu , Hu Yiwen , Li Yi , Zang Zengliang , You Wei , Liu Lang , Liu Ning 
Published: May 2024

Abstract

During the 2023 Chinese New Year (CNY), many city governments relaxed restrictions on residents setting off fireworks. Fireworks contain large amounts of sulfur powder, which releases the toxic air pollutant sulfur dioxide (SO2) when combusted rapidly. In this study, we employed a four-dimensional variational (4DVar) assimilation system to examine variations in SO2 emissions in China by assimilating hourly ground-based observation data. Two sets of experiments were conducted during the CNY in 2022 and 2023 to quantify the variations in SO2 emissions. On CNY's Eve in 2022, nationwide SO2 emissions increased by 4.701 Gg compared to the preceding day. During the CNY in 2023, following the relaxation of the fireworks ban, there was a significant upsurge of 8.22 Gg in SO2 emissions on CNY's Eve compared to the previous day. This increase included a rise of 2.037 Gg in the Energy Golden Triangle region, 1.709 Gg in the North China Plain and 0.945 Gg in northeastern China. After reaching the peak on CNY's Eve, the overall national SO2 emissions during the 2023 CNY showed a rapid decline in the following two days. However, the emission levels remained elevated compared to the pre-CNY period, indicating the lingering effects of fireworks burning. Compared to the forecasts using the prior emissions, the optimized emissions markedly improved the model forecasts of SO2 during the 2023 CNY period, evidenced by an increase in the correlation coefficient (R) from 0.12 to 0.63 and a reduction in the root-mean-square error (RMSE) by 49.9%, demonstrating the effectiveness of the optimized emissions. These findings will be useful for local governments in formulating strategies for fireworks burning during the CNY period.
A Distributed Security Approach Based on Artificial Immune Systems for Intrusion Detection in Internet of Things
Authors: Rosset Valério , de Almeida Maíra Baptista , de Carvalho André Carlos Ponce de Leon Ferreira 
Published: May 2024

Abstract

Although the Internet of Things (IoT) is one of the fastest-growing technology paradigms, efforts in securing this environment do not advance as fast. A classical type of network security mechanism is the Intrusion Detection System (IDS). However, mainly due to their resource limitations, their incorporation to IoT environments built on top of low-end devices is not easy. To make this incorporation easier, this paper proposes a Distributed Immune Security Architecture (DISA) based on Artificial Immune Systems. DISA incorporates modules across network tiers (e.g. Cloud, Fog, and Edge) for monitoring, aggregation, training, storage of traffic models, and resource control. Using a dataset tailored for the training of Intrusion Detectors, we implemented and validated a distributed Intrusion Detector model combining Federated and Active Learning methods, named Fed-Active. Experimental results show that Fed-Active model reduces training times and achieves predictive performance comparable to those of traditional centralized approaches
Construction of an urban cold island network under the perspective of local climate zones
Authors: Yang Jun , Cai Xiaoyu , Zhang Yuqing , Xiao Xiangming , Xia Jianhong (Cecilia) , Tian Linxue 
Published: May 2024

Abstract

Urban blue–green spaces(BGS) exhibit a remarkable cold island (CI) effect, and research on heat mitigation measures based on CIs has attracted considerable attention. However, few studies have been conducted on mitigating urban overheating by connecting isolated CI patches to form CI networks. Therefore, this study aimed to explore the framework and specific processes for building an urban CI network in Hangzhou, China. The CI network construction framework consisted of “source identification-resistance surface construction-corridor construction”. Based on morphological spatial pattern analysis, local climate zone (LCZ) theory, connectivity index, and circuit theory, the CI sources and cooling corridors were identified and classified, and the pinch and barrier points in the network were determined. The results indicated that the CI network in Hangzhou comprised 69 CI sources, 134 cooling corridors, 36 pinch points, and 89 barrier points. Based on these results, we recommended that the LCZs in the CI network that are dominated by water (LCZG) and dense trees (LCZA) be protected and areas that are dominated by bare rock or pavement be improved. This study and methodology can provide new inspiration for future planning of urban BGS and sustainable urban cooling.