bluuebunny/crossref_metadata_2025 huggingface dataset:
Determination of Critical Fracturing Spacing Affecting the Simultaneous Growth of Multiple Hydraulic Fractures from a Horizontal Wellbore
Authors: Cheng Shaoyi , Wu Bisheng , Han Yanhui , Zhang Xi , Chen Zhaowei , Tan Peng , Yang Liu
Published: September 2023

The multi-stage hydraulic fracturing and horizontal well have become the most important technologies in extracting oil and gas from unconventional reservoirs. However, the stress shadow effect often hinders the simultaneous growth of multiple fractures when design parameters such as fracture spacing and injection parameters are not set properly. Therefore, one of the key issues in a fracturing treatment is the determination of the fracture spacing within a fracturing stage under different combinations of geomechanical and injection parameters. This paper presents a numerical study by using the in-house code, DeepFrac, a fully coupled hydraulic fracturing simulator based on the dual boundary element method and finite volume method. The evolution of the optimal fracture spacing with the geomechanical and injection parameters is investigated. The results demonstrate the dependence of the optimal fracture spacing on the energy dissipation and in-situ stress contrast. A dimensional analysis is carried out, and two dimensionless groups are determined including the dimensionless toughness and dimensionless in-situ stress difference. A critical fracturing spacing is proposed based on the dimensionless groups, which can capture the combined role of different parameters in the fracture growth. The effectiveness of the proposed critical fracturing spacing determination criterion is verified by a few additional numerical experiments.

INTRODUCTION

The growth of multiple parallel hydraulic fractures (HFs) subjected to a single fluid source is commonly seen in various geological scenarios, such as dike swarms driven by magma supplied by mantle plume and artificial fractures created by fluid injection in the extraction of hydrocarbons. In order to promote the productivity of gas and oil, the hydraulic fracturing treatment is often designed in such a way that simultaneous growth of multiple fractures in each stage can be achieved (Nie et al. 2022). Although such multistage technique has effectively enabled cost savings, field practices have shown that a large portion of perforation clusters failed to initiate or contribute to production according to production logs in Miller et al. (2011). The reasons behind such phenomenon include nonuniformity of rock properties, in-situ stress, stress shadow effect, etc. The stress shadow effect refers to the suppression of some fractures exerted by the neighboring HFs (Peirce and Bunger 2015), which can lead to preferential growth of some HFs and eventually results in a nonuniform fracture pattern.
Experimental Study on Tensile Damage Localization Evolution of Shale After CO2-Brine Treatment
Authors: Buge Du , Guangqing Zhang , Xuliang Jia , Dawei Zhou
Published: September 2023

CO2-brine corrodes the shale structure and damages mechanical properties in the Carbon Capture and Sequestration (CCS), potentially leading to the instability of reservoirs. In this study, Brazilian tests are conducted to analyze the tensile strain localization of brine and CO2-brine treated (30MPa, 110°C, 30 days) shale specimens by DIC (Digital Image Correlation), and tensile failure processes are compared. Moreover, the relationship between the tensile strain localization and the microscopic damage has been established. Results show that: (1) The initiation stress of strain localization decreases, and the heterogeneity of the strain field increases at peak stress for homogenous specimens. The initiation stress of strain localization for specimens loaded vertically to bedding planes is reduced, specimens loaded horizontally to bedding planes have two initiation points. (2) The role of the bedding on tensile strain localization is enhanced. The tensile strain is localized more significantly on the bedding after initiation, resulting in the fracture initiation along bedding planes; multiple parallel fractures are generated for specimens loaded horizontally to bedding planes. (3) The microscopic damage of laminated and homogenous shale is different in origin. Oriented micro-fractures are induced at the bedding of laminated shale, while slight-apertured, short, and disorderly distributed micro-fractures are developed in the homogenous shale. It is fundamental reason that the variation of tensile strain localization of CO2-brine treated laminated shale is more significant than that of CO2-brine treated homogenous shale.

INTRODUCTION

In the Carbon Capture and Sequestration (CCS) engineering of shale reservoirs, CO2 and fluid produce complex physicochemical interactions on reservoir rock minerals (Zhou & Zhang, 2016), new pore and fracture structures are formed on the micro-scale of rocks, and macro-mechanical properties (elastic modules, strength, fracture toughness, etc.) are degraded (Lyu et al., 2020; Bhuiyan et al., 2020; Tang et al., 2020). Due to continuous fluid migration in the rock seepage channel in the process of CCS, the pore pressure field and effective stress field have a long-term heterogeneous evolution. Such development may lead to the expansion of the original rock fractures and the initiation of new fractures. The long-term accumulation of damage may lead to the formation of macro fractures, resulting in formation instability and CO2 escape, and impacts CCS engineering safety (Han et al., 2020).
Introducing a Data Collection Framework for Recording Rock TBM Field Performance Data
Authors: Khetwal A. , Rostami J. , Nelson P. P.
Published: September 2023

Tunnel Boring Machines (TBM) have perhaps become the dominant technique of tunneling worldwide. One of the essential steps to justify using TBMs, planning the completion time, and estimating the cost is evaluating machine performance in given ground conditions. The primary performance indicator for TBMs is the average daily advance rate (AR) which is a product of the rate of penetration (ROP), utilization (U). Accurate estimation of TBM utilization depends on the data set used in the prediction models, including various activities and downtimes that are often not categorized uniformly. The reported activities are inconsistent between projects, leading to heterogeneous datasets typically challenging to analyze. This heterogeneity indicates the need for developing a uniform and coherent data collection protocol. The present study identifies and offers a data collection framework for the compilation of the required information for rock TBM downtime and utilization analysis. A detailed field performance data from seven projects were studied, and a framework for more consistent data recording is proposed. A visual basic for application (VBA) based data collection framework is developed that incorporates the field report into a unified database thereby improving the accuracy of estimated TBM utilization and updating the project schedule during the construction phase.

INTRODUCTION AND BACKGROUND

The growing need for tunnels in the present world demands a proficient method for construction. The construction techniques require resourceful management of the various site logistics involving tunnel boring machine (TBM) systems that are the TBM itself and the backup area behind it. The backup system includes mucking, transportation, utility extension (water pipes, electric cables, ventilation ducts), and surveying guidance systems. Management of these TBM logistical items determines the machine's overall performance and ultimately affects the project completion time. However, TBM backup systems’ setup differs, considering the TBM design, project requirements, and contractor's experience. For example, the muck conveyance system may either be via train with muck cars or conveyor belts. Hence, it is necessary to incorporate these differences in developing a methodology to estimate the performance of the whole TBM system. Any variation in the time allocated to perform an activity is essential for performance prediction and decision-making. Therefore, a flexible database management system is paramount, considering long-term applicability and reference for future projects.
Creation of a Data-Calibrated Discrete Fracture Network of the Utah FORGE Site
Authors: Cao Meng , Sharma Mukul M.
Published: September 2023

Three single-cluster hydraulic fracture stages were pumped at the Frontier Observatory for Research in Geothermal Energy (FORGE) site in Milford, Utah. Our goal was to develop a robust model to accurately represent the formation of fracture networks in this naturally fractured geothermal reservoir. To begin this process, we used geological and geophysical data and data from one-dimensional Fullbore Formation MicroImager (FMI) to build a discrete fracture network model for the natural fractures. The natural fracture network (DFN) was built stochastically with areal density, length, and orientation distribution of natural fractures. We then took one-dimensional synthetic cores to ensure that the number and density of fractures per unit length of the core matched with the actual measurements (for each fracture set) until the best statistical description of natural fractures was found. The length distribution of natural fractures was simulated using a power law distribution.

INTRODUCTION

Utah Frontier Observatory for Research in Geothermal Energy (FORGE) is a dedicated laboratory for developing, testing, and accelerating breakthroughs in EGS technologies to advance the use of geothermal resources (Department of Energy, 2022). Natural fractures have been indicated by outcrop data and Fullbore Formation MicroImager (FMI) log data. Most of the data can be found directly or indirectly in the Geothermal Data Repository (GDR), which includes data from Utah FORGE, as well as all data collected from other researchers funded by the Geothermal Technologies Office (GTO) (Department of Energy, 2022). Fig. 1 shows the locations of the vertical pilot well (58-32), the highly deviated injection well (16A(78)-32), and another deep vertical well (56-32). In this paper, based on the data provided by these wells, a discrete fracture network (DFN) was developed to characterize the natural fracture network. Fractures are explicitly expressed in the form of planes of weakness. A DFN realization (Fig. 2) is built with a specified distribution of fracture orientation, length, and density (Cao et al., 2023). A model that can simulate fracture propagation in naturally fractured reservoirs can be found in Cao and Sharma (2023, 2022a, 2022b).
Spatio-Temporal Evolution of Swelling Behavior of Gyeongju Bentonite Under Hydration Process
Authors: Diaz M. B. , Lee G. W. , Yun S. , Kim K. Y.
Published: September 2023

Gyengju bentonite has been suggested as a candidate material for buffer and backfill in high-level radioactive waste repository facilities in South Korea. Under the influence of environmental conditions such as thermal, hydrological, and mechanical processes, it is essential to investigate the behavior of these materials. In this study we assessed the swelling behavior of KJ-II Gyeongju bentonite under hydration using X-ray CT technology. A cylindrical sample of 27.5 mm in diameter and 34 mm in height using was utilized in a tailor-made hydration cell, and water was injected at a constant pressure of 0.206 MPa for seven days. Multiple CT scans were carried out before and every 24 hours after hydration onset. A small defragmentation was observed at the top of the sample after assembly, which disappeared gradually after hydration began. The CT profiles provided a detailed view of the swelling process, which was initially detected as an increase in CT values at the middle and upper parts of the sample, while the lower region experienced a decrease near the inlet point. The initial increase and decrease in the respective upper and lower regions diminished over time, and the final values approached the original state. The mean CT value of the sample increased by 4.3% after day 1 and decreased progressively to 0.6% on day 7. Furthermore, the CT distribution curves demonstrated the heterogeneity of the particle density captured through the full width at half maximum and revealed that the hydration process initially increased the heterogeneity, which later decreased as the bentonite underwent swelling. Finally, vertical sections taken near the inlet were used to calculate the differences between each hydration day and the dry state. The mean values on these changes in the diametrical direction showed that the hydration process occurred without significant variations between the region near the inlet and adjacent regions, indicating uniform hydration. This evaluation demonstrated the benefits of this non-destructive technology and its ability to provide detailed information about bentonite materials undergoing hydration.
Deep Learning Based 3-Dimensional Rock Discontinuity Trace Mapping and Orientation Characterization
Authors: Kim S. S. , Lee G. W. , Kim T. H. , Diaz M. B. , Kim K. Y.
Published: September 2023

We propose a 3D rock discontinuity trace mapping technique based on deep learning. Additionally, we present a methodology for characterizing the orientation of rock discontinuity traces using the mapped results. The U-net-VGG 16 deep learning model, which is a transfer learning model based on U-net was used to achieve more precise and accurate discontinuity trace mapping. To verify the proposed methodology, a rock outcrop in the southern Korean peninsula was selected to create a 3D discontinuity trace model. Rock images and automatically mapped trace images obtained with the deep learning model, were combined to generate the 3D discontinuity trace model. The orientation of the rock discontinuity traces were calculated by fitting a plane to the point cloud 3D data of linear segments of the discontinuity traces, and obtaining the orientation of the generated planes. The orientation of discontinuity traces estimated using this method was validated by comparing those results with the orientations of the rock surfaces adjacent to the rock discontinuities. The results indicate that the deep learning model was able to properly map major discontinuity traces. Moreover, the characterization of discontinuity orientations using the 3D discontinuity trace model produced reliable results, with a maximum average difference between the orientations measured through discontinuity traces and adjacent rock surfaces of 2.1°. We believed that rock mass characterization using the proposed method reduces subjectivity and increases reliability.

INTRODUCTION

In rock engineering, rock mass stability is generally evaluated using classification systems such as the Rock Mass Rating (RMR), the Q-system, or the Geological Strength Index (GSI). The scores or values can serve to determine ground support or blasting patterns. Typically, rock surface mapping is performed manually. However, this process is subjective and can lack reliability. Moreover, areas of difficult access can increase the risk of accidents or diminish the rock survey quality.
Pengaruh Ekonomi Dan Prilaku Filantropi Islam Di Era Pandemi Covid – 19 Terhadap Kebahagiaan Mahasiswa Institut Agama Islam Tafaqquh Fiddin Dumai
Authors: Bakti Aulia
Published: September 2023

pandemi covid-19 tidak hanya berdampak pada kesehatan masyarakat, tetapi juga tidak mempengaruhi kondisi perekonomian, pendidikan, dan kehidupan sosial masyarakat. salah satu dampak yang sangat terasa dan mudah sekali dilihat adalah melemahnya konsumsi rumah tangga atau melemahnya daya beli masyarakat secara luas. prilaku filantropi islamiah praktik kedermawanan dalam islam seperti zakat, infaq, sedekah, dan wakaf (ZISWAF) atau sekarang lebih populer dengan istilah filantropu islam merupakan sebuah kajian penting dalam arus sejarah islam. Penelitian ini bertujuan untuk mengetahui pengaruh ekonomi dan prilaku filantropi islam terhadap kebahagiaan mahasiswa Institut Agama Islam Tafaqquh Fiddin Dumai. populasi dalam penelitian ini adalh 388 mahasiswa Institut Agama Islam Tafaqquh Fiddin Dumai. pengambilan sampel dilakukan dengan menggunakan teknik Purposive Smapling sehingga jumlah sampel 197. penelitian ini menggunakan metode penelitian kuantitatif. Data yang digunakan dalam penelitian ini adalah data primer, data dianalisis menggunakan analisis regresi linier dengan bantuan program SPSS 21. Hasil penelitian ini menyatakan terdapat pengaruh positif dan signifikan antara ekonomi dan prilaku filantropi islam diera covid-19 terhadap kebahagiaan mahasiswa dengan presentase 86% dan sebesar 14% dipengaruhi oleh faktor lain.
Design and Research of the Image Processing Unit and Telemetric Equipment for the Laser-Guided Very Short Range Air Defence Systems Field Simulator
Authors: Fedaravicius Algimantas , Jasas Karolis , Survila Arvydas , Grimaila Vitas
Published: September 2023

In this article, the engineering concept of the laser-guided very short range air defence system field simulator, its structure, and practical use are presented. The possibilities and advantages of the practical use of the equipment developed in tactical exercises and individual training of air defence specialists are shown. The field simulator equipment without invasion and compromising functionality into the combat air defence system has been connected and installed. The simulator performs all required shooting procedures without using combat missiles, target detection, shot execution, and maintaining the target in the sighting lens until its destruction. The field simulator reduces training process expenses and increases its efficiency. In the article, the ground control and onboard control units are presented. The units consist of target detection and its positioning, coordinate defining and data transmission (global positioning system (GPS), personal computer (PC), radio frequency (RF) transceiver), pyrotechnic charge for missile launch simulation, and target destruction devices (e.g., smoke generator), whose operating principles, functional capabilities, and work reliability are ensured on the basis of conducted research. The field simulator, which was created based on synthesising the simulator systems studied, has proven itself in practise.
Manufacturing of Low-Cost Parabolic Dish Concentrators with Manual Dual-Axis Tracking
Authors: Benzetta Abd Elhalim , Abderrezek Mahfoud , Chettoh Ali , Benbahia Mokhtaria Asma
Published: September 2023

The increased rate of energy crises around the world results in expanding the role of Concentrating Solar Power (CSP) technology for different applications, comprising heating process and power generation applications. The Parabolic Dish Concentrator (PDC) with its large concentration ratio and its modular capacity attracts researchers’ efforts. In this research work, we have designed and developed a PDC with back silvered mirrors as reflector material. Then we have sized the following geometric parameters: the dish diameter, the focal length, the aperture area, the rim angle, the geometric concentration ratio, the receiver material, and the receiver diameter. Furthermore, a dual-axis manual tracking system has been built for this PDC. It should be mentioned that the different components of the PDC have been recycled from a scrap yard to develop a low-cost PDC system. Finally, we have investigated the temperature evolution as a function of time at the focus spot. The maximum temperature obtained is 112 °C for the PDC with mirror. The findings of the study reveal the possibility of building a low-cost solar concentrator with good performance and high quality, only by employing recycled materials, and it could be operated in various applications.
Advanced Pitch Angle Control Based on Genetic Algorithm and Particle Swarm Optimisation on FAST Turbine Systems
Authors: Gorel Goksu , Abdi Mahdi O.
Published: September 2023

In this paper, the increase in the quality of the rotor speed of wind turbines and the decrease in mechanical loads on the turbines are investigated. Adjusting the angle of the blade to the nominal wind speed, the rotor speed of the wind turbine is maintained at its nominal value. Using control methods (such as proportional integral (PI), genetic algorithms (GAs), and particle swarm optimisation (PSO)), different results can be recovered. In addition, individual control of the blade tilt angle allows us to reduce the mechanical loads on the turbine with the control methods. The wind turbine was modelled in Matlab/Simulink. The simulation results show that individual control of the blade tilt angle ensures the quality of the rotor speed of the wind turbine and reduces the balanced periodic loads on the wind turbine. In the first part, we study the wind turbine in a global way, as well as the method used to calculate them. Then, we discuss the FAST system, which was used to model the wind turbine, as well as the design of individual pitch angle control. As a result, it is possible to reduce the fatigue of the mechanical wind turbine parts. According to the study, the mechanical load for all three blades was reduced by an average of 44 % compared to the PI and PSO methods and by 1 % compared to the PI and GA methods. The control of the pitch angle in wind energy systems is performed with different control methods. The study analysis of the mechanical loads found that they are largely balanced. Winds that blow perpendicular to the turbine blades on the x-axis provide these loads.
„Der Kampf zwischen Gut und Böse wirkt faszinierend.“ Melanie Verhovnik-Heinze über die Faszination True Crime, Kriminalitätsfurcht und mediale Verantwortung
Authors: Verhovnik-Heinze Melanie , Schützeneder Jonas
Published: September 2023

Nur ein kleiner Teil der Gesellschaft kommt in direkten Kontakt mit (erlebter) Kriminalität. Der Großteil an Informationen und Emotionen zu diesem Teil menschlichen Zusammenlebens wird medial vermittelt. Große Reichweiten und unzählige Formate finden sich dabei seit einigen Jahren vor allem im Genre True Crime. Im Interview mit Communicatio Socialis erklärt Melanie Verhovnik-Heinze die Hintergründe zur medialen Darstellung von realer und fiktionaler Gewalt und liefert Hinweise, wie El- tern kleiner Kinder zu diesem Thema schrittweise die richtigen Worte finden.
Specific and Common Effects of Parenting Styles and Bullying on Internet Addiction
Authors: Siavashnasab Kolsom , Firouzi Mohammadreza , Zadehbagheri Ghader
Published: September 2023

Background: Excessive and inappropriate use of the internet and related technologies is a severe problem in Iranian society. Extensive evidence demonstrates that parenting styles and bullying increase the risk of internet addiction in teenagers. However, more research is required to improve the existing knowledge about the impact of parenting styles and bullying on students' internet addiction. Objectives: This study aimed to investigate specific and common effects of parenting styles and bullying on female high-school students' internet addiction. Materials and Methods: This was a descriptive-correlational study. The population comprised all female high-school students in Yasouj (Iran) in the academic year 2020-21, of whom 357 were selected by convenience sampling. The data collection instruments, distributed online, included Young Internet Addiction Questionnaire, Baumrind's Parenting Styles and Dimensions Questionnaire, and the Illinois Bully Scale. The data were analyzed by the analysis of variance based on structural equation modeling. Results: The explained variance (R2) of internet addiction for the specific effect of parenting style and bullying was 0.12 and 0.20, respectively. Moreover, the explained variance (R2) of internet addiction for the common effect of bullying and parenting style was 0.25. Conclusions: The results emphasize the importance of the specific and common effects of parenting styles and bullying on internet addiction. Therefore, programs should be developed to prevent internet addiction and other familial and social harms.
Tècniques de representació gràfica : exercicis
Authors: Garcia Almirall Ignasi , Codina Muñoz Francesc Xavier , Castillo Baliarda Miquel
Published: September 2023

Aquesta publicació recull els materials elaborats per a la informatització de l'asignatura Tècniques de Representació Gràfica, obligatòria de primer curs d'Enginyeria Industrial i d'Enginyeria Química a l'Escola Tècnica Superior d'Enginyers Industrials de Barcelona (ETSEIB).
Conté més de cent exercicis de classe i exàmens dels darrers cursos (enunciats i fitxers) que es poden resoldre mitjançant ordinador.
El projecte d'informatització de Tècniques de Representació Gràfica ha estat premiat a la sisena edició del Concurs d'ajuts per a l'elaboració de material docent de la UPC.
Comunicacions analògiques
Authors: Fernández Rubio Juan Antonio
Published: September 2023

L'objectiu d'aquest llibre és proporcionar a l'estudiant una introducció als principis bàsics dels sistemes de comunicació analògics. Els cinc darrers temes del llibre s'adapten perfectament a l'assignatura de COM I del pla 92 de l'ETSETB i per tant el llibre pots ésser utilitzat com a llibre de text de l’esmentada assignatura. A més a més, el llibre compren 3 temes introductoris als senyals i sistemes.
Ajust d'observacions : el mètode dels mínims quadrats amb aplicacions a la topografia
Authors: Rodríguez Jordana Juan
Published: September 2023

Aquest material apareix com a conseqüència de l’escassetat de literatura que tracti l’ajust d’observacions per mètodes de mínims quadrats aplicats a la topografia en llengua castellana i, molt menys en llengua catalana, i que les referències més corrents en aquest àmbit no són gaire assequibles. Està pensat com la continuació natural d’un curs (imprescindible) de fonaments d’estadística per a estudiants de matèries relacionades amb la topografia i, en aquest sentit, pot ser d’utilitat per a estudiants de qualsevol enginyeria que inclogui aquestes matèries seus programes.
Automàtica Fitxes d'ajuda per a pràctiques
Authors: Morcego Seix Bernardo , Cugueró Escofet Josep , Pérez Magrané Ramon
Published: September 2023

Aquest material aporta la base teòrica necessària per realitzar pràctiques d’automàtica tant bàsica com avançada, però també descriuen metodologies i eines que es fan servir en el laboratori. Per facilitar la comprensió, algunes d’aquestes fitxes inclouen exemples on s’aplica la teòria descrita.
Cimentaciones y estructuras de contención : problemas resueltos
Authors: Olivella Pastallé Sebastià , Josa Garcia-Tornel Alejandro , Valencia Francisco José
Published: September 2023

Esta publicación contiene una colección de problemas resueltos de Cimentaciones y Estructuras de Contención
preparada para los estudios de Ingeniería Técnica de Obras Públicas que se imparten en la UPC. Contiene problemas resueltos de cimentaciones superficiales (zapatas), cimentaciones profundas (pilotes) y estructuras de contención (muros). Principalmente se realizan cálculos para comprobaciones tanto desde el punto de vista resistente (hundimiento, estabilidad) como en servicio (asientos).
Química fotogràfica bàsica
Authors: Torrent Burgués Juan
Published: September 2023

Les teories sobre el procés fotogràfic estan lligades als conceptes més complexos de la física i de la química actuals. Intentar exposar-les en un llibre per a estudiants de forma comprensible i rigorosa constitueix un repte difícil, però a la vegada engrescador, ja que cal buscar un equilibri entre la complexitat i la mera descripció, sense oblidar que l'objectiu principal és proporcionar unes bases cientificotècniques suficients per tal que el fotògraf comprengui el procés fotogràfic i pugui, si vol, manipular-lo per a les seves finalitats artístiques i professionals.
En aquest llibre s'intenten donar les bases químiques per al coneixement dels materials fotogràfics i per a la comprensió dels fenòmens que es produeixen en els processos fotogràfics, però a la vegada també s'aborda l'estudi bàsic d'aquests materials i processos, i s'hi apliquen els fonaments que s'han presentat prèviament. L'autor espera que el llibre sigui d'utilitat per als alumnes de l'EFFPC i també a tots aquells fotògrafs, afeccionats o estudiants de fotografia que estiguin interessats en els aspectes químics relacionats amb la fotografia.
Dissenys amb microprocessadors
Authors: Closas Torrente Lluís
Published: September 2023

Amb aquesta obra es pretén que el lector adquireixi les coneixements necessaris per fer dissenys amb microprocessadors, per això anem establint uns criteris de dissenys que fan que arribem a construir físicament el disseny.
Els criteris proposats d’arquitectura de la CPU, temps de resposta i velocitat de transferència dels diferents mètodes de gestió de transferències per part d’un ordinador (polling, interrupció i DMA), aspectes electrònics del busos etc. ens permeten escollir la millor solució del maquinari (hardware) en cada cas. Aquests criteris de disseny es particularitzen per a la família 80x86 d’Intel per tenir un exemple pràctic i perquè és molt emprada en el món industrial. Finalment es veu la relació d’aquests criteris amb paràmetres bàsics de la teoria de la informació.

L'obra es complementa amb un recull d’exàmens resolts de l’assignatura de Disseny de Sistemes Basats en Microprocessador de l’especialitat d’Enginyeria Tècnica en Sistemes de Telecomunicació de l’Escola de Sant Just Desvern. Amb la resolució d’aquests problemes per part de l’estudiant es pretén que l’alumne complementi la seva formació en un curs bàsic de dissenys amb microprocessador.
Els autors del llibre són professors del Departament d’Enginyeria Electrònica de la Universitat Politècnica de Catalunya i fan classe a l’Escola Tècnica Superior d’Enginyeria de Telecomunicació i a l’Escola Universitària Politècnica del Baix Llobregat.
Circuitos y sistemas lineales : curso de laboratorio
Authors: Bertran Albertí Eduardo , Montoro López Gabriel
Published: September 2023

Este curso se ha diseñado para una asignatura de Circuitos y Sistemas Lineales que tenga el objetivo de dar unos fundamentos teóricos contrastados con trabajos experimentales. Cada práctica de laboratorio está compuesta por tres apartados: bases, estudio previo y trabajo de laboratorio. El objetivo de las bases es dar una información previa al trabajo experimental de forma que el alumno tenga los fundamentos necesarios para saber qué va a hacer y porqué va a hacerlo. El estudio previo es un conjunto de desarrollos teoricos necesarios para poder realizar y comprender los diversos trabajos experimentales en el laboratorio. El trabajo de laboratorio indica las realizaciones, pruebas y mediciones que en él deben hacerse. En concreto, los objetivos de este curso experimental son: -conocer las bases que permitan interpretar resultados experimentales y diseñar circuitos básicos. -Hacer e interpretar mediciones de circuitos en el dominio temporal y frecuencial, usando para ello instrumentación electrónica habitual en un laboratorio de baja frecuencia. -Usar y, cuando sea preciso, construir dispositivos electrónicos básicos para el procesado analógico de señales.
Arquitectura de aplicaciones distribuidas
Authors: Navarro Moldes Leandro
Published: September 2023

Este material proporciona una visión detallada de cómo funcionan las aplicaciones distribuidas en Internet que utilizan el transporte de datos mediante los protocolos TCP/IP; Los principios básicos de diseño de las aplicaciones de Internet para conseguir sistemas escalables e interoperables. Los conceptos esenciales comunes a la mayoría de protocolos; juegos de caracteres, encapsulamiento de objetos (MIME), representación de información estructurada (HTML, STILOS CSS, WAI, XML, DTD, SCHEMA, XSLT), seguridad, autenticación, transporte de información multimedia (RTP, RTSP, IP, MULTICAST). Los protocolos para aplicaciones de "transferencia indirecta" de mensajes: correo electrónico (SMTP, POP, IMAP), conferencias (NNTP). Los protocolos para aplicaciones de "transferencia directa" de mensajes; consulta a directorios (LDAP), web (FTP, HTTP, DAV). Los protocolos para aplicaciones de "tiempo real": aplicaciones multimedia de transferencia de sonido y vídeo (RTP, RTSP). Los protocolos para aplicaciones de invocación remota, para que una comunidad de organizaciones pueda mantener intercambios (XML-RPC, SOAP, RMI, CORBA). Este es el caso de las aplicaciones de comercio electrónico, constituidas por un gran conjunto de estándares emergentes basados, en muchos casos, en el intercambio de documentos XML. El objetivo es conocer los fundamentos básicos de las aplicaciones de internet, mostrar el funcionamiento de los protocolos de que se sirven y, sobre todo, aprender e forma práctica a implantar servicios y desarrollar nuevas aplicaciones distribuidas.
Funcions reals d'una variable real
Authors: Boadas Elvira Juan
Published: September 2023

Conté: vol. 1. Qüestions inicials, límits, continuïtat, derivació -- vol. 3. Integral definida, integral impròpia

Aquesta publicació tracta els temes fonamentals de les funcions reals d'una variable real: conceptes bàsics, límit, continuïtat, derivació i integració, que formen part en la majoria dels programes de les assignatures del primer curs universitari, enllaçant amb els continguts de l'ensenyament secundari. Els temes estan desenvolupats amb rigor i tenint molta cura en utilitzar una simbolització adequada. Encara que, en general, no figuren les demostracions corresponents, es pretén que l'alumne adquireixi l'esquema mental d'aquests capítols bàsics del coneixemnt científic i tècnic, que podrà complementar adequadament segons el nivell dels estudis que realitzi. Per a un complet aprenentatge s'inclouen en cadascun dels capítols una col.lecció d'exercicis resolts dels quals es dóna el resultat final perquè l'estudiant pugui conèixer si ha après els continguts estudiats. Bàsicament està pensat per a tots els que volen adquirir una base sòlida del Càlcul infinitesimal i, en particular, per aquells estudiants que tenen més dificultat en assolir aquests coneixements o no poden assistir a classes presencials en nombre suficient.
Probabilitat i estadística
Authors: Burillo Puig José , Miralles de la Asunción Alicia , Serra Albó Oriol
Published: September 2023

En aquest llibre s'ofereix una introducció a la probabilitat i a l'estadística adaptada a l'alumnat de primer curs d'una enginyeria tècnica, especialment les enginyeries relacionades amb les tecnologies de la informació. L'objectiu principal del llibre és que l'alumne assoleixi un coneixement bàsic i alhora suficient de les eines probabilistes i estadístiques que pugui necessitar en la seva futura carrera professional com a enginyer. El llibre es divideix en dues parts ben delimitades. La primera està dedicada al càlcul de probabilitats, en què s'introdueixen les eines necessàries per a l'estudi dels fenòmens probabilístics. En particular, s'introdueixen les variables aleatòries, tant discretes com contínues, i es dóna molta importància a l'estudi de la normal com a variable aleatòria fonamental. En la part estadística, s'exposen les eines bàsiques dels estudis estadístics: els estimadors i els intervals de confiança, els tests d'hipòtesi i la regressió lineal. Cada capítol es complementa amb una llista extensa de problemes proposats.
Programació i bases de dades : sessions de teoria
Authors: Xhafa Xhafa Fatos
Published: September 2023

Aquest material cobreix el temari de l’assignatura de “Programació i bases de dades”, principalment dels estudis de les enginyeries tècniques no informàtiques. S’ha procurat que sigui el més autocontingut possible seguint també les noves directrius de la Declaració de Bolònia. Per això, el material està estructurat per “hores”, corresponent-se a un total de 30 hores d’activitat del professor i 37.5 hores d’estudi de l’estudiant (2 crèdits de teoria segons l’actual sistema de crèdits). Els conceptes de teoria van acompanyats de programes per ordenador per tal de practicar individualment i independentment amb els conceptes explicats. També s’inclou un cas d’estudi perquè sigui dut a terme amb la participació dels estudiants.
Gestión de la calidad
Authors: Griful Ponsati Eulàlia , Canela Campos Miguel Ángel
Published: September 2023

Este libro trata de las nociones básicas de la gestión de la calidad y de algunas técnicas estadísticas útiles en el contexto de la ingeniería en organización industrial. Presenta las tendencias actuales sobre gestión de la calidad, incluyendo los modelos más comunes: el Malcolm Baldrige Award, el European Quality Award de la EFQM y las normas de la serie ISO 9000. Proporciona la metodología y la formulación estadística para poder diseñar planes de muestreo de recepción de materiales, construir gráficos de control, realizar estudios de capacidad de un proceso y estudios de control de los equipos de medida. La terminología empleada es la que propone la internaional Organization for Standardization (ISO), el organismo internacional de normalización (v. ISO 9000). Aunque su orientación es industrial, muchas de las cuestiones que se abordan en este libro también son válidas para empresas de servicios e incluso para la Administración pública
Enhancing Digital Literacy Through English Language Teaching: A Needs Analysis for English Students at Muhammadiyah University of Mataram
Authors: Irwandi Irwandi , Hidayati Hidayati , Lukman Lukman
Published: September 2023

The importance of digital literacy has grown significantly, making its integration into English language teaching (ELT) crucial. This study investigated the role of ELT in promoting digital literacy among English students at Muhammadiyah University of Mataram and identified their digital literacy needs. Using a mixed-methods research design, data were collected from students’ need through questionnaires and interviews, which assessed their digital literacy skills, technology use in ELT, and perceived needs for digital literacy development. The findings showed that students were interested in incorporating digital literacy into ELT and identified various digital tools, platforms, and skills they considered essential. Participants emphasized the importance of teacher guidance, language-specific digital resources, and training. The study recommends integrating digital literacy development into the ELT curriculum, providing accessible resources, and exploring further research opportunities. The results offer practical insights for language educators, policymakers, and researchers aiming to enhance digital literacy skills among English Department students through ELT.
Peningkatan Minat Belajar Siswa Kelas VIII.B melalui Layanan Bimbingan Kelompok Masa Covid-19 SMPN 3 Masbagik
Authors: Nuraida Nuraida
Published: September 2023

This counseling guidance class action research aims to determine the effectiveness of Classical Services in Increasing Student Interest in Class VIII.B SMPN 3 Masbagik Academic Year 2020/2021 during the covid-19 pandemic. By using classical guidance services, it focuses on providing maximum assistance so that the final hope can increase the level of student interest in learning in participating in learning activities in all subjects studied during the week. From this counseling guidance class action research, it was obtained that students' interest in learning in learning was obtained after guidance in the first cycle was obtained, the completeness level of learning interest was 69% and in the second cycle the student's interest in learning was 100%, meaning there was an increase from cycle I to cycle II. Thus, action research on counseling counseling classes by applying group guidance services can be said to be very effective in increasing student interest in learning in the learning process.
Upaya Meningkatkan Hasil Belajar Matematika dengan Pendekatan Contextual Teaching and Learning (CTL) pada Siswa Kelas V Semester I Tahun Pelajaran 2019– 2020 di SDN 2 Setanggor
Authors: Wirya Baiq Sri Olati
Published: September 2023

This study aims to improve student's learning outcomes in solving mixed calculation problems with contextual teaching and learning (CTL) approaches. This research method is a type of classroom action research. This class action research was conducted at SD Negeri 2 Setanggor which is addressed to Lendek Village, Sukamulia sub-district. The implementation of this study was carried out in class V of the 2019/2020 school year with a total of 27 students. Based on the discussion of the results of the cycle I and cycle II research it can be concluded that using car-car props on the calculation of integer calculation operating materials with contextual teaching and learning (CTL) approach, can improve student learning outcomes this is proven: In cycle, I the number of students completed on the main operation calculates integers (addition and subtraction) with contextual teaching and learning (CTL) approach is 66% or 18 of the  27 students. In cycle II, the percentage of student completion experienced improvements with the contextual Teaching and Learning (CTL) approach which is as much as 85% or 23 out of 27 students.
Meningkatkan Hasil Belajar PJOK Materi Bola Voli Menggunakan Permainan 3 on 3 pada Siswa Kelas VIII-3 SMP Negeri 2 Keruak Masa Covid 19 Semester Ganjil Tahun Pelajaran 2021/2022
Authors: Winarko Hadi
Published: September 2023

This study aims to determine whether the 3 on 3 game can improve volleyball bottom passing skills in class VIII-3 students of SMP Negeri 2 Keruak, East Lombok. This research is a classroom action research (classroom action research) which is carried out collaboratively and participatively. The design of this research uses the Kurt Lewin Model in 2 cycles consisting of planning, implementation & observation, and reflection. The research sample includes students of class VIII-3 who found 16 students at SMP Negeri 2 Keruak, East Lombok. The focus of the research is to improve down passing skills. The technique of collecting data is through an action test. The data analysis technique was carried out descriptively, qualitatively and quantitatively. The results showed that the skill of passing under the ball using Game 3 for Class VIII-SMP Negeri 2 Keruak Lombok Timur in East Lombok Regency has increased, namely from the results of the first cycle test obtained as many as 5 students (31.25%) completed learning, and 11 students or 68.75% have not finished studying. Then the results of the second cycle test showed 15 students (93.75%) had completed learning and 1 student or 6.25% had not finished studying. Based on the average results obtained, it can be said that there was an increase of 25.00% in the second cycle from the first cycle. Thus it can be said that using 3 on 3 games can improve the learning process and the ability to pass the ball under the ball grade VIII-3 SMP Negeri 2 Keruak East Lombok.
Upaya Peningkatan Kompetensi Guru dalam Pembelajaran melalui Supervisi Kelas pada TK PKK Terpadu Mayang Nira Selong Kecamatan Selong Tahun Pelajaran 2020/2021
Authors: Hairi Hj.
Published: September 2023

This school action research activity was carried out at the PKK Terpadu Mayang Nira Selong Kindergarten for 3 months, starting from August to October 2020 by going through cycle stages. The purpose of this school action research (PTS) is to determine the extent to which the supervision carried out by the principal followed by the provision of guidance/treatment to the target teachers can improve the competence of these teachers in applying learning models in the classroom. In this school action research (PTS) it was conducted in 2 cycles, from the results of the actions taken it was proven to be able to increase teacher competence by achieving ideal standards. In the first cycle, the increase in teacher competence after classroom supervision was carried out after coaching on the use of several new learning models reached around 33.33% in the second cycle, it could increase to 100%. The average score obtained after class supervision was carried out in the first cycle was 63.00 and increased in the second cycle to 83.33, meaning that there was an increase of 20.33. The results of this school action research show that coaching principals can improve teacher competence in developing learning by applying learning models in their respective classes.
Meningkatkan Kemampuan Berkomunikasi Anak melalui Permainan Kartu Kata Bergambar pada Kelompok B TK PKK Terpadu Mayang Nira Selong Kecamatan Selong Tahun Pelajaran 2020/2021
Authors: Mahnim Mahnim
Published: September 2023

This research will be carried out in group B of the Integrated PKK Kindergarten Mayang Nira Selong, Selong District, East Lombok Regency, for the 2020/2021 academic year. This classroom action research is planned to be carried out for 4 months from January to April. This Classroom Action Research is carried out in 2 cycles, each cycle is carried out in 3 meetings in 2 weeks. So in 2 cycles will be carried out for 4 weeks. Each meeting is held in 2 hours of lessons with 30 minutes of each lesson. The application of picture word card games can improve activities and communication skills through picture word card game activities for children in group B of the Integrated PKK Kindergarten Mayang Nira Selong. This increase can be seen from the acquisition of children's activity scores, teacher activities and class average scores as well as classical completeness levels in each cycle which have increased in cycle I and cycle II.
Peningkatan Hasil Belajar Matematika melalui Penerapan Metode Problem Based Learning Masa Pandemi Covid-19 pada Siswa Kelas IX-1 SMP Negeri 1 Masbagik Semester Ganjil
Authors: Pujawati Baiq Sri
Published: September 2023

The purpose of this classroom action research (CAR) is to find out the extent to which students' learning outcomes in Mathematics are improved by applying the Problem-Based Learning Method. In this classroom action research (CAR), it is carried out in 2 cycles, from the results of the actions taken it is proven to be able to improve student learning outcomes by achieving the classical mastery that is set at 85%. Classical completeness 62.5% obtained in the first cycle, can be increased in the second cycle to 85.4%. In terms of student activity, there was also an increase, namely in the first cycle, the moderately active category increased to an active category. The results of this action research indicate that the application of the Problem-Based Learning Method can improve student learning outcomes in Mathematics with completeness reaching 100%.
Kajian Konsep Pendidikan Multikultural dalam Islam
Authors: Shofwan Arif Muzayin
Published: September 2023

Some experts claim that multicultural education comes from the West, especially from the United States which only knows blacks and whites. However, this statement has been strongly denied by other experts. In Islam, multicultural education has actually existed since the time of the Prophet Muhammad. Research with this literature study resulted in the following conclusions. First, Islam has known multicultural education since the time of the Prophet Muhammad SAW, namely Islam does not recognize the existence of a class system, because it is not in accordance with its character, but there is only one level where all individuals have the same rights and obligations. Second, in the context of Indonesia, the foundation for multicultural education is Pancasila and the 1945 Constitution. Third, the characteristics of multicultural education in Islam have three characteristics, namely: (1) principles of democracy, equality, & justice; (2) the principle of humanity, togetherness, and peace; and (3) develop an attitude of acknowledging, accepting, and appreciating cultural diversity, which is based on the Qur'an and the Hadith of the Prophet Muhammad.