bluuebunny/crossref_metadata_2025 huggingface dataset:
Aproximación a la Intervención de la Demencia desde los Cuidados Paliativos
Authors: Cisneros Orozco Joseline , De La O Diaz Jose Ricardo , Mata Brenes Anthony Geovanny
Published: January 2024

This research explores dementia and its characteristics, along with an approach from the perspective of palliative care intervention. The theoretical framework is structured from the elements that characterize dementia, the differential diagnosis with respect to dementia whose origin is of another etiology, together with a general vision of palliative care and the intervention models that are developed from this. . The methodology used was a bibliographic review, focused on studies that had a close relationship with the topic under study and that also allowed us to have an updated vision of the topic. Among the discussion elements, the importance of having a holistic perspective in the treatment of the dementia patient is highlighted, which covers the clinical, emotional, social and spiritual aspects. Also, the importance of respect for the patient's autonomy is emphasized, this being a key aspect for the decisions that will be made in the therapeutic process.
A Stage-structure Leslie-Gower Model with Linear Harvesting and Disease in Predator
Authors: Beay Lazarus Kalvein , Leleury Zeth Arthur , Rijoly Monalisa E. , Lesnussa Yopi Andry , Wattimena Abraham Zacaria , Rahakbauw Dorteus Lodewyik
Published: January 2024

The growth dynamics of various species are affected by various aspects. Harvesting interventions and the spread of disease in species are two important aspects that affect population dynamics and it can be studied. In this work, we consider a stage-structure Leslie–Gower model with linear harvesting on the both prey and predator. Additionally, we also consider the infection aspect in the predator population. The population is divided into four subpopulations: immature prey, mature prey, susceptible predator, and infected predator. We analyze the existences and stabilities of feasible equilibrium points. Our results shown that the harvesting in prey and the disease in predator impacts the behavioral of system. The situation in the system is more complex due to disease in the predator population. Some numerical simulations are given to confirm our results.
Feature Extraction of Risk Group and Electricity Theft by using Electrical Profiles and Physical Data for Classification in the Power Utilities
Authors: Janthong Supakan , Duangsoithong Rakkrit , Chalermyanont Kusumal
Published: January 2024

Non-technical loss (NTL) is one of the problems that has been a major issue in lost revenue for many years. Electricity distributors have attempted to reduce NTL by detecting electricity theft using various methods. Some events are difficult to detect that conventional meters inspection is inadequate. Moreover, many anomaly patterns found are very complex, confusing in identifying or distinguishing what types of electricity customers are at abnormal risk or energy theft that affects NTL. This paper proposes five key feature extraction methods and six classifying electricity customers using supervised learning. The main problem was studied and collected information, including kilowatt meters, electronic meters, TOU meters, and AMR meters, which cover four customer types that were recorded in the Provincial Electricity Authority (PEA) of Thailand. An electrical profile to be extracted for in-depth analysis of the behavior of each type of electricity customer, combined with the information of physical data to help enhance and increase efficiency. All features examined the relationships in each feature using Pearson correlation and handled unbalanced data using random oversampling (ROS). Then, the extracted data has been trained, validated, and tested to classify three classes: normal, risk, and theft, where we evaluate the results with performance metrics. The results show that random forest (RF) outperforms the rest of the classifiers by achieving a precision-recall area under the curve of 90% and a receiver operating characteristic curve of 78%. Significantly, the results were compared to previous studies and benchmark datasets, which revealed that the proposed method gave better results than other techniques.
D-Wave Implementation of Quantum Annealing for Optimal Resource Allocation in Disaster Response Operation of Marikina City
Authors: Ruth Cadeliña Allyza , Assanty Cuevas Mori , Kallos Marselean , John Montemayor Morris , Jay Uy Ronald , Benjamin Rodriguez Joshua , Tubola Orland
Published: January 2024

Quantum computing shows a positive approach for addressing optimization challenges in NP-hard problems such as the vehicle routing problem (VRP). This study focuses on improving the efficiency of disaster response operations by localizing the application of D-wave quantum annealing in Marikina City. This study uses the Solution Partitioning Solver (SPS) and the Quadratic Unconstrained Binary Optimization (QUBO) formulation to convert the VRP into an equation that can be solved using quantum annealing. The study demonstrates that quantum computing effectively distributes resources during emergency response operations and improves overall operational efficiency. In determining the most effective route for each vehicle, the D-wave Leap API and QUBO representation compute the distances traveled by each vehicle. These findings contribute to the practical applications of quantum computing to revolutionize various fields, including disaster management. Implementing D-wave quantum annealing in Marikina City shows relevance for future advancements in optimizing resource allocation and improving disaster response operations.
Non-Destructive Inspection of Tile Debonding by DWT and MFCC of Tile-Tapping Sound with Machine versus Deep Learning Models
Authors: Panyavaraporn Jantana , Horkaew Paramate
Published: January 2024

One of the essential processes of construction quality control is tile bonding inspection. Hollows beneath tile tessellation can lead to unbounded or completely broken tiles. An interior inspector typically used a hollowsounding technique. However, it relies on skill and judgment that greatly vary among individuals. Moreover, equipment and interpretation are difficult to calibrate and standardize. This paper addresses these issues by employing machine-learning strategies for tile-tapping sound classification. Provided that a tapping signal was digitally acquired, the proposed method was fully computerized. Firstly, the signal was analyzed and its wavelets and MFCC were extracted. The corresponding spectral features were then classified by SVM, k-NN, Naïve Bayes, and Logistic Regression algorithm, in turn. The results were subsequently compared against those from a previous works that employed a deep learning strategy. It was revealed that when the proposed method was properly configured, it required much less computing resources than the deep learning based one, while being able to distinguish dull from hollow sounding tiles with 93.67% accuracy.
La particitation numérique dans les slogans du hirak algérien
Authors: Ait Allaoua Kahina
Published: January 2024

Cette contribution est le prolongement d’une précédente publication1 portant sur l’usage de la particitation dans le discours protestataire des manifestants algériens lors du mouvement populaire du 22 février 2019. Cette présente étude va reprendre le concept de particitation initié par Maingueneau, tout en considérant le langage numérique comme le thésaurus qui nourrit en arrière-plan le discours militant dans les slogans des jeunes manifestants. Ainsi, et à travers une étude sociolinguistique, énonciative et pragmatique ; nous allons montrer que l’usage du code informatique dans ces énoncés ne serait pas seulement l’expression d’une quête de reconnaissance d’une catégorie sociale, mais un nouveau moyen de mobilisation,
Walking pain-free: A prospective study on the efficacy of surgical resection with Achilles tendon reinforcement for painful Haglund lesions
Authors: Toreih Ahmed A , Abdelbadie Ahmed , El-Adawy Moawed F
Published: January 2024

Background

Haglund’s deformity is a common cause of posterior heel pain, often requiring surgical management when conservative treatment fails. Traditionally, surgery focused solely on resection of the bony prominence, yielding suboptimal outcomes.

Aim

This study assessed the efficacy of surgical resection of painful Haglund lesions combined with Achilles tendon reinforcement for managing insertional Achilles tendinitis.

Methods

Twenty patients with insertional Achilles tendinitis underwent surgical resection of Haglund lesions and Achilles tendon reinforcement with suture anchors. Functional outcomes were evaluated using the American Orthopedic Foot and Ankle Society (AOFAS) Ankle-Hindfoot score preoperatively and at 6 and 12 months postoperatively. Complications were recorded.

Results

The mean AOFAS score significantly improved from 43.5 ± 7.2 preoperatively to 79.0 ± 9.1 at 6 months and 84.5 ± 9.8 at 12 months postoperatively (P<0.001). Early weight-bearing was achieved in 2 weeks. The complication rate was 25% (all minor). There were no re-ruptures or revisions during the one-year follow-up.

Conclusion

Surgical resection combined with Achilles tendon reinforcement is an effective treatment for Haglund’s deformity, allowing early weight-bearing while significantly improving function. It is associated with a low complication rate and no major adverse events. This technique addresses both bony and soft tissue pathologies, optimizing outcomes.
Unilateral versus bilateral instrumentation with lumbar interbody fusion for degenerative lumbar diseases: A retrospective study
Authors: Elkhateeb Tameem M , Zahlawy Hany EL , Hussien Mohammed A
Published: January 2024

Purpose

To assess the clinical and radiological outcomes of patients experiencing fusion technique by unilateral versus bilateral instrumentation with interbody lumbar fusion.

Materials and methods

Fifty-nine patients were included in this study. Thirty-six patients were managed with bilateral PSF and interbody fusion, and 23 had unilateral PSF and interbody fusion. Clinically, the patients were evaluated using the mJOA score. They were followed up for a minimum period of 3 years. Fusion at follow-up was established using radiographs.

Results

Procedure periods were quicker, and blood loss was fewer in the unilateral group. Fusion rates were comparable in both groups with insignificant differences. There was a statistically significant difference in clinical improvement of JOA scores in both groups.

Conclusion

Unilateral pedicle screw fixation together with interbody fusion is an efficient choice in chosen cases. Prospective, randomized research with a higher number of cases and longer follow-up times is required for more consistent outcomes.
Lateral calcaneal lengthening osteotomy versus subtalar arthroereisis in symptomatic flexible flat foot in children
Authors: Mostafa Ahmed G , Abdelkhalik Waleed S , Abd El Fatah Karim A , Hassaan Ahmed M
Published: January 2024

Background

Pediatric Flexible flat foot is the prevalent type of flat foot. Conservative measures are the first line of treatment. However, surgery may be required in some cases.

Objective

To compare outcomes of lateral calcaneal lengthening osteotomy versus subtalar arthroereisis for the pediatric flexible flat foot.

Methods

Calcaneal lengthening osteotomy was operated on 25 feet and subtalar arthroereisis was operated on 19 feet. Patients were evaluated preoperative and postoperative according to the American orthopedic foot and ankle society (AOFAS) ankle-hindfoot score, Meary’s angle and Talonavicular coverage angle. The follow-up duration was 18 months.

Results

Lateral calcaneal lengthening osteotomy showed better clinical and radiological outcome versus subtalar arthroereisis. In LCL group,American orthopedic foot and ankle society (AOFAS) ankle-hindfoot score (68.2 ± 1.45 preoperative to 98 ± 5 postoperative) and Talonavicular coverage angle (18.8 ± 5.6 preoperative to 3.96 ± 2.46 postoperative) improved versus SA group, the AFOAS (68.62 ± 2.93 preoperative to 96.55 ± 3.48 postoperative) and Talonavicular coverage angle (23.98 ± 5.88 preoperative to 5.94 ± 4.59 postoperative) respectively. Significant difference was found postoperative between the two groups regarding Meary’s angle, in LCL group improved from 17 ± 5.04 preoperative to 4.44 ± 1.66 postoperative while in SA group the angle improved from 23.62 ± 7.74 preoperative to 2.98 ± 1.27 postoperative.

Conclusion

Calcaneal lengthening osteotomy achieved more improvement in AOFAS score than subtalar arthroereisis group with better clinical and radiological outcomes but subtalar arthroereisis is less invasive procedure with early weight bearing and mobilization.
Comparison between magnetic resonance imaging and intraoperative arthrogram in detection of soft tissue obstacles to reduction in developmental dysplasia of the hip
Authors: Youssef Amin A-R , Mosa Mena M , Elsharkawi Karim M , Barakat Mohamed S , Farahat Ali A K , Bastawi Rim A
Published: January 2024

Background

The spectrum of abnormalities in developmental dysplasia of the hips (DDH) is not limited to osseous changes, but extends to include periarticular soft tissue changes, which could not be visualized by conventional radiographs or computed tomography (CT). Both MRI and conventional arthrogram can evaluate those soft tissue obstacles to reduction.

Patients and methods

In total, 16 children with DDH (21 hips), dated for surgical management by open reduction, were chosen. All patients were examined by preoperative MRI as well as intraoperative arthrogram. Both modalities were used to assess different obstacles to reduction, such as the labrum, pulvinar, ligamentum teres (LT), iliopsoas tendon interposition, and the transverse acetabular ligament (TAL).

Results

Both MRI and conventional arthrogram showed similar sensitivity (100%) for detection of ligamentum teres pathology, labral inversion, and hypertrophied pulvinar. MRI showed higher sensitivity than arthrogram for detection of the iliopsoas tendon interposition (100% vs. 64.5%) and for detection of the thickened transverse acetabular ligament (85.7% vs. 19%).

Conclusions

Both MRI and conventional arthrogram can visualize the soft tissue obstacles to reduction in dysplastic hips. MRI is a noninvasive technique, requiring sedation in the pediatric population. Conventional arthrogram is an invasive technique. However, significant complications can be readily avoided.
Transolecranon and lateral Kirschner wire fixation for displaced supracondylar humeral fracture in children
Authors: Fayad El Sayed Sadek Ramadan , Hegazy Mohamed Mahmoud , Hassan Ahmed Shaban
Published: January 2024

Introduction

Percutaneous pinning of supracondylar humerus fracture(SCHF) in children is an effective way to maintain the anatomic reduction of a displaced. closed reduction and percutaneous pinning (CRPP) had been considered the standard treatment for displaced SCHF in children.

Patients and methods

A prospective case series, was conducted at the emergency department of Helwan university hospital from February 2020 to September 2021. It includes 40 patients with Gartland type III fracture who presented to the orthopaedic casualty and were included in the study. Four patients (10%) had the transolecranon wire was directed intramedullary, 11 patients (27%) had the wire directed posterolaterally, and 16 patients (40%) had the wire directed posteromedially and 9 patients (23%) had the wire directed posteriorly.

Results

The mean age was 5.57 years (range from 2–12 years). The mean Baumann angle in the patients was (70.89 ± 2.40). The mean follow-up duration was 3 months (range from 3–3.2 months). with mean carrying angle was about (9.37 ± 2.52) and no one of the patients had an excessive deformity of carrying angle that required correction. Regarding ROM loss, there were 25, but always poor. A few complications occurred including pin tract infection and broken transolecranon wire and all were tolerable with no effect on the outcome.

Conclusion

The Transolecranon and lateral Kirschner wires fixation is an effective option that provides good stability with the little number of trials in the management of supracondylar fracture of the humerus in children, and the risk of nerve injury or fishtail deformity was avoided especially in the hands of junior trainees in their first 3 years of training.
Plate over nail and bone graft for management of tibial non union after intramedullary fixation
Authors: El Alfy Barkat , Hussein Aymam M , Fawzy Sallam F , Abdelaziz Mohamed
Published: January 2024

Non union after intramedullary nail fixation is difficult to treat. Many options are available for its management including nail exchange, bone graft while keeping the nail, nail removal and plating. Each method has its advantages and disadvantages. The aim of this study is to evaluate the results of management of tibial non union after intramedullary fixation using plate augmentation. Between January 2012 and December 2019, thirty four patients with nonunited fracture tibia previously treated with locked intramedullary nails were included in this study. The ages of patients ranged from 20 to 62 years ( an average age: 43 years). All patients were diagnosed to have aseptic nonunion. All patients achived bony union except 2. Bone union was achieved in a time ranged from 3 to 9 months (an average time 5 months). The average limb length discrepancy was 1 cm ( range 0 to 1.5 cm ). The reported complications were superficial wound infection in 2 cases, joint stiffness in 3 patients and nonunion in 2 cases. There were no intraoperative complications. All patients reported no pain at the fracture site during weight bearing at the final follow-up. We concluded that augmentation plate fixation is a good option for treatment of tibial nonunion after intramedullary nail.
Median effective dose of intranasal dexmedetomidine for satisfactory mask induction in children undergoing examination under anaesthesia for retinoblastoma - A prospective up and down sequential allocation study
Authors: Subramanian Shalini , Shetty Deepa , Dudeja Gagan , Das Priyanka
Published: January 2024

Background and Aims:

Inhalational technique is used to induce anaesthesia in children without intravenous access. We aimed to determine the median effective dose (ED50) of intranasal dexmedetomidine to ensure satisfactory mask acceptance during inhalation induction in children with retinoblastoma undergoing examination under anaesthesia.

Methods:

A prospective sequential allocation study was conducted in children aged 1–60 months divided into Group A (1–18 months) and Group B (18–60 months). Children were administered dexmedetomidine intranasally as premedication. Sedation was assessed using the modified Observer Assessment of Alertness and Sedation Scale until induction. Successful mask acceptance was defined as a cooperative or asleep child during inhalational induction. The starting dose of dexmedetomidine was 1 µg/kg. The next dose varied by 0.2 µg/kg depending on the outcome of this case. According to the Dixon up-and-down method, the mean of midpoints of the failure–success sequence was calculated to obtain the ED50 values.

Results:

The ED50 of intranasal dexmedetomidine for satisfactory mask acceptance was 0.7 µg/kg (95% confidence interval [CI]: 0.54–0.86) in Group A (n = 23) and 0.96 µg/kg (95% CI: 0.83–1.08) in Group B (n = 25) (P = 0.020). The mean (standard deviation) duration of anaesthesia was 33.5 (14.9) minutes in group A versus 23.5 (8.48) minutes in Group B (P = 0.007).

Conclusion:

ED50 was lower in children younger than 18 months than in older children. There was no difference in the time to discharge from the post-anaesthesia care unit despite the procedure being longer in smaller children.
Assessing feasibility and satisfaction in third-trimester pre-anaesthetic teleconsultations: A prospective observational study
Authors: Sassi Kaissar , Tardif Elsa , Lasry Louis , Manenc Lola , Guerby Paul , Minville Vincent
Published: January 2024

Background and Aims:

Pregnancy presents risks, particularly for women with pre-existing health problems. Pre-anaesthetic consultations can help anticipate these risks and establish a medical management strategy on the delivery day. While teleconsultations gained popularity during the coronavirus disease 2019 (COVID-19) pandemic, research on pre-anaesthetic teleconsultations during pregnancy is limited. This study aimed to assess patient satisfaction and physician perception of teleconsultations for third-trimester pre-anaesthetic consultations.

Methods:

A prospective observational study included pregnant women who opted for teleconsultations for pre-anaesthetic consultations. Patient satisfaction was assessed using Likert scale questions and the System Use Scale. Anaesthetist satisfaction was evaluated using a Likert scale and by considering changes in anaesthetic techniques and missing clinical data in the pre-anaesthetic assessment. Data analysis utilised SPSS Statistics for Windows, Version 20.0. encompassing descriptive statistics, hypothesis testing and odds ratio calculations. This approach explored the correlation between patient and anaesthetist satisfaction and pertinent risk factors.

Results:

The study enroled 99 patients, with 85% expressing satisfaction and high satisfaction on the Likert scale and 88% finding the teleconsultation acceptable based on the System Use Scale (score ≥ 70). Anaesthetists reported being satisfied with the pre-anaesthetic consultations in 94% of cases.

Conclusion:

This study demonstrates the feasibility and effectiveness of telemedicine consultations in obstetric anaesthesia, showing high patient and anaesthetist satisfaction rates.
Comparative evaluation of nebulised dexmedetomidine vs fentanyl for the treatment of post-dural puncture headache (PDPH) in parturients after caesarean section under spinal anaesthesia: A randomised controlled study
Authors: Kumar Amarjeet , Sinha Chandni , Singh Kunal , Anant Monika , Kumar Ajeet , Kumari Poonam
Published: January 2024

Background and Aims:

The incidence of post-dural puncture headache (PDPH) following spinal anaesthesia in the obstetric population is around 0.5%–2%. Hydration, bed rest, caffeine, paracetamol, non-steroid anti-inflammatory drugs, epidural blood patches, etc., are the various modalities used for its management. This study aims to compare nebulised dexmedetomidine versus fentanyl for the treatment of PDPH in parturients after caesarean section under spinal anaesthesia.

Methods:

Ninety obstetric patients aged 18–35 years with American Society of Anesthesiologists (ASA) physical status II/III and suffering from PDPH as per the criteria of the International Headache Society after caesarean section under spinal anaesthesia were recruited in this double-blinded randomised study. Patients were randomised to Group D (dexmedetomidine 1 µg/kg nebulisation), Group F (fentanyl 1 µg/kg nebulisation), and Group S (saline nebulisation 4mL). The nebulisation was done 12 hourly for 72 hours. Assessment parameters included pain score and the requirement of additional treatment such as paracetamol, caffeine, and epidural blood patch. Analysis of variance test was used for continuous quantitative variables, and the Kruskal–Wallis test was used for quantitative discrete data.

Results:

The pain scores at 1, 6, 12, 24, 48, and 72 hours following nebulisation were significantly lower in Group D in comparison to groups F and S (P < 0.001). The number of patients requiring additional analgesic therapy was lower in Group D in comparison to patients in other groups (P < 0.001).

Conclusion:

Dexmedetomidine nebulisation resulted in effective reduction in PDPH symptoms and pain scores. Nebulisation with fentanyl did not alleviate PDPH symptoms when compared to the control group.
Колмогоровские поперечники пересечения конечного семейства классов Соболева
Authors: Vasil'eva Anastasia Andreevna
Published: January 2024

Получены порядковые оценки колмогоровских поперечников пересечения классов Соболева на $d$-мерной области, удовлетворяющей условию Джона, и на одномерном торе (последнее обобщает результат Э. М. Галеева).
Библиография: 24 наименования.
О квадратичных подполях обобщенно-кватернионных расширений
Authors: Kiselev Denis Dmitrievich
Published: January 2024

Мы даем необходимые и достаточные условия погружения квадратичного расширения числового поля $k$ в расширение с группой обобщенных кватернионов; при этом рассматривается случай как циклического ядра, так и обобщенно-кватернионного. Как следствие, доказывается, что класс ультраразрешимых $2$-расширений с циклическим ядром не совпадает с классом неполупрямых расширений. Также даются достаточные условия погружения квадратичных расширений $k(\sqrt{d_1})/k$, $k(\sqrt{d_2})/k$, $k(\sqrt{d_1d_2})/k$ числового поля $k$ в обобщенно-кватернионное расширение $L/k$. Рассматриваются примеры.
Библиография: 14 наименований.
Single‐shot phase‐shifting on Michelson interferometry for incoherent digital holography
Authors: Hong Keehoon , Choi Kihong
Published: January 2024

A single‐shot phase‐shifting method in incoherent digital holography (IDH) based on Michelson interferometry is proposed herein. The proposed method uses polarization‐modulating optical elements and a polarization sensor in the Michelson interferometer optics to induce a geometric phase shift. It acquires four holograms with different geometric phase retardations in a single exposure to eliminate the bias and conjugate noise using a phase‐shifting technique. The proposed optical system enables real‐time bias and conjugate term removal from a recorded hologram without requiring sequential recording for phase shifting. Furthermore, because it is based on Michelson interferometry, it can be implemented using simple reflective optics without expensive or difficult‐to‐produce optical elements for single‐shot phase shifting. The principles of self‐interference and geometric phase shifting in the proposed optical structure were analyzed mathematically. A real‐time IDH‐recording experimental setup was constructed to verify the proposed method. The experimental results of single‐shot phase‐shifting IDH and hologram movie recordings confirm the feasibility of the proposed method.
Modeling and Comparing the Total Cost of Ownership of Passenger
Automobiles with Conventional, Electric, and Hybrid Powertrains
Authors: Mittal Vikram , Shah Rajesh
Published: January 2024

The global automotive industry’s shift toward electrification hinges on battery
electric vehicles (BEV) having a reduced total cost of ownership compared to
traditional vehicles. Although BEVs exhibit lower operational costs than
internal combustion engine (ICE) vehicles, their initial acquisition expense is
higher due to expensive battery packs. This study evaluates total ownership
costs for four vehicle types: traditional ICE-based car, BEV, split-power
hybrid, and plug-in hybrid. Unlike previous analyses comparing production
vehicles, this study employs a hypothetical sedan with different powertrains for
a more equitable assessment. The study uses a drive-cycle model grounded in
fundamental vehicle dynamics to determine the fuel and electricity consumption
for each vehicle in highway and urban conditions. These figures serve a Monte
Carlo simulation, projecting a vehicle’s operating cost over a decade based on
average daily distance and highway driving percentage. Results show plug-in
hybrids generally offer the most economical choice. Due to the BEVs’ heavier
weight and battery cost, they only become more cost-effective than plug-in
hybrids after 160 km daily travel, associated with only a small percentage of
drivers in the United States. Nevertheless, they remain cheaper than
conventional vehicles for most distances. The study also investigates the
effects of government subsidies, battery cost, and weight on overall expenses
for each powertrain. It concludes that opting for less expensive, albeit heavier
batteries would generally reduce EV ownership costs for consumers.
Experimental Assessment of Different Air-Based Battery Thermal
Management System for Lithium-Ion Battery Pack
Authors: Bhat Pritam , Varpe Mahesh K.
Published: January 2024

Lithium-ion (LI) batteries are widely used to power electric vehicles (EVs),
owing to their high charge density, to minimize the environmental pollution
caused by fossil fuel-based engines. It experiences an enormous amount of heat
generation during charging and discharging cycles, which results in higher
operating temperatures and thermal nonuniformity. This affects performance,
useful battery life, and operating costs. This can be mitigated by an effective
battery thermal management system (BTMS) to dissipate the heat there by
safeguarding the battery from adverse thermal effects and ensuring high
performance, safety, and longevity of the battery. This article presents a
method to estimate the cooling requirement of a given battery pack using
calorimetry and discusses the effect of airflow path, flow rate, and inlet air
temperature on the thermal behavior of a 4S4P battery pack consisting of 18650
type lithium iron phosphate (LFP) cylindrical Li-ion cells each of 2.55 Ah
capacity. In battery pack operation without a cooling system, it is found that
the interior cells experience a 3°C higher cell temperature relative to the rest
of the battery pack. The cooling performance of the different air BTMS, viz.,
natural convection cooling, single suction fan cooling, two-fan air cooling,
centralized inlet air cooling, and wet jute-based single suction fan air
cooling, is discussed. It is observed that the peak temperature rise of the
cells in the battery pack was found to be the least in centralized inlet air
cooling, unlike other cooling configurations. The wet jute-based single suction
fan air cooling is superior by achieving the highest COP of 6, with an 8.9°C
rise in battery pack peak temperature for a permissible peak discharge rate. It
is observed that the temperature rise of the battery pack is profoundly
influenced by the temperature of the inlet air compared to the flow rate.
Selected Aerospace Diameter Pitch Combinations of Metric 60° Screw Threads for Nuts and Bolts
Authors:   E-25 General Standards for Aerospace and Propulsion Systems
Published: January 2024

This Aerospace Standard establishes the preferred diameter-pitch combinations of ISO metric 60° screw threads recommended for use in the aerospace industry for metric module bolts and nuts.
Límites del derecho a huelga en los servicios públicos
Authors: Castro Medina Raquel
Published: January 2024

En el contexto del derecho de huelga en España, se evidencia su arraigo constitucional como un medio fundamental para la protección de los intereses laborales, siendo reconocido como un derecho subjetivo, constitucional, fundamental e inalienable. No obstante, a pesar de su importancia, la regulación actual presenta desafíos notables. La falta de una legislación específica para funcionarios públicos, a pesar de su reconocimiento expreso en el Estatuto Básico del Empleado Público (EBEP), genera un vacío normativo que requiere atención inmediata. La carencia de límites claros y condiciones específicas para el ejercicio del derecho de huelga por parte de los funcionarios públicos añade complejidad a la situación. Mientras el EBEP reconoce expresamente este derecho, la ausencia de una normativa detallada deja interrogantes sobre aspectos cruciales como los procedimientos de convocatoria y tramitación, así como las excepciones y limitaciones aplicables a este colectivo.

La urgencia de abordar esta falta de legislación específica se fundamenta en la necesidad de garantizar un ejercicio equitativo del derecho de huelga por parte de los funcionarios públicos. La claridad normativa en cuanto a los límites y condiciones permitirá una aplicación más coherente y justa de este derecho fundamental, armonizando así las dinámicas laborales en el ámbito público con los principios constitucionales que rigen el derecho de huelga. Este llamado a la acción legislativa pretende superar las complejidades actuales y consolidar un marco normativo robusto que asegure tanto la protección del derecho fundamental como el funcionamiento efectivo de los servicios públicos esenciales.
Aplicación de la metodología de Checkland para el diagnóstico de una prótesis tumoral de rodilla
Authors: Huerta-Lecona Aideé , Hernández-Simón Luis Manuel , Domínguez-Hernández Víctor Manuel , Araujo-Monsalvo Víctor Manuel , Domínguez-Hernández Víctor Manuel , Rico-Martínez Genaro
Published: January 2024

Durante la observación de algunos fenómenos en la ciencia médica es común encontrarse con sistemas de bioingeniería complejos, debido a las múltiples interacciones de estos con el medio ambiente o dentro de los subsistemas que los conforman. Si los sistemas presentan una falla, la mayoría de los especialistas trabajan de manera autónoma, lo cual dificulta un diagnóstico integral y la completa erradicación del problema. La ciencia de sistemas permite comprender la situación, con el propósito de implementar u optimizar sistemas complejos y ayuda a integrar el conocimiento de diversas disciplinas mediante un proceso estructurado para lograr una solución integral. La ciencia de sistemas se vislumbra como una valiosa herramienta para el diagnóstico de sistemas de bioingeniería. En este documento se presenta el diagnóstico de una prótesis tumoral de rodilla, como ejemplo de un sistema de bioingeniería. Esta prótesis tiene como objetivo la reconstrucción de la extremidad inferior mediante la técnica de artrodesis. A pesar de que la prótesis ha mostrado un buen desempeño, se han presentado situaciones críticas que han ocasionado la falla del sistema. Se propone la aplicación de la metodología de Checkland para obtener información sobre las posibles fallas del sistema y brindar una solución que englobe los aspectos emocionales, físicos, sociales y económicos del sistema.
Determinación del enfriamiento en piezas fundidas mediante la técnica de la simulación
Authors: Suárez-Lisca Lázaro Humberto , García-Caballero Ramón , Muñiz-Acosta Yaidel , Alonso-Martínez Alexis
Published: January 2024

La modelación del enfriamiento de una pieza es un elemento vital para la obtención de piezas fundidas con la calidad requerida. En este caso, la pieza que se toma como material de estudio es un cilindro de laminación, pieza que requiere de una elevada calidad por las condiciones de trabajo en la que desarrolla su trabajo. Este artículo está encaminado a demostrar la importancia del uso de estas técnicas predictivas que tanto aportan a la economía de una empresa. Para llevar a cabo este trabajo, se determinaron los principales elementos de la tecnología de fundición y se realizó una búsqueda sobre los principales datos físicoquímicos del metal a utilizar, elemento muy complejo por las características del metal. Como resultado de la evaluación se pudo apreciar el enfriamiento de la pieza con el transcurrir del tiempo, además de poder constatar la importancia de la simulación para piezas con altos requerimientos de calidad y costo. Palabras clave: simulación, enfriamiento, cilindros de laminación.
Instrumento virtual de un filtro adaptable usando una red neuronal dinámica para cancelación de ruido implementado en LabVIEW
Authors: Anzueto-Ríos Álvaro , Santiago-Godoy Rafael , Hernández-Santiago Kevin Andrés , Hernández-Gómez Luis Enrique
Published: January 2024

En un laboratorio de máquinas, el ruido que producen cuando se encuentran en operación, sobrepasa los decibeles recomendados, convirtiéndose en contaminación auditiva. En este trabajo se presenta una aplicación para minimizar la contaminación por ruido que se produce en este tipo de laboratorios. Una red neuronal se ha utilizado para la cancelación dinámica del ruido, se desarrolló empleando el software NI LabVIEW 2013 en su versión académica. El instrumento virtual (VI) del sistema está compuesto del panel frontal y el diagrama funcional. Se emplea el algoritmo de aprendizaje de la regla delta sobre una red ADALINE (ADAptative LINear Element). Esta consta de treinta bloques de retraso, cada bloque se encarga de retrasar un tiempo a la señal de entrada y desarrollando de esta manera un tipo de filtrado por ventana. La neurona en su proceso de aprendizaje busca aproximarse al ruido producido por las máquinas. El instrumento virtual tiene como interfaz de trabajo a la tarjeta NI MyDAQ, donde se reciben las señales de entrada, provenientes de micrófonos tipo electret. En el diagrama funcional se presentan las partes que constituyen el sistema: el supresor de ruido, los componentes del algoritmo LMS y los bloques de lectura de las señales de entrada y salida. La señal resultante del sistema se manda al exterior a un parlante. La gráfica de error presentada indica que la neurona tiene un alto grado de similitud con este sonido. Al restar el valor aprendido por la neurona, a la mezcla de entrada, el ruido fue minimizado demostrando la efectividad del sistema.
Competitiveness in the Electronics Industry of Mexicali Affected by Atmospheric Corrosion
Authors: López-Badilla Gustavo , Sánchez-Ocampo César , Paz-Delgadillo Judith Marisela
Published: January 2024

The electronics industry has grown over the past fifty years, especially in developed countries, contributing to its economy. In particular, Baja California that is located in northwestern Mexico, have industrial parks with companies in other countries, mainly of United States, Japan, Germany, South Korea and China. In this State, is located Mexicali city, on the US border, where a large number of industrial plants was installed, with 80% of electronic trade industries, and the rest (20%), has electronic devices and systems in the industrial equipment and machinery. Based on this, a study was conducted to determine the main types of electrical faults and organize the main causes of reduced operating performance of equipment and electronic machinery, using the ABC graphs and together with the software Matlab graphics. The analysis showed that the operating performance was lower in some summer and winter periods, and when levels of relative humidity and temperature were higher than 75% to 30 ° C, and presence of sulfides concentrations exceeded the air quality standards, causing atmospheric corrosion.
Weft Thread Tension during Filling Insertion Process on Projectile Weaving Machines
Authors: Oleynikova Liudmila , Oleinikov Vitalii
Published: January 2024

Weft thread tension during filling insertion process on projectile weaving machines is time dependent and is characterised by big values of tension force maximums. As one can see from a number of investigations a weft yarn moves by jerks and vibrates though a projectile inserting a weft moves with almost constant velocity after its starting. In accordance with observations a weft thread forms slacks along it in the course its filling insertion. It follows owing to a short time during which a weft comes to a movement, a quick compensator lever movement and elastic properties of a yarn. When a weft slack is hauled in, a weft undergoes a jerk and so a maximum of a weft thread tension arises. First weft slack arises when a compensator lever quickly sinks and releases a weft thread. Then a projectile comes to a movement and hauls a weft slack. A part of a weft between a weft accumulator and a compensator comes to its movement during a short time and thus extremely big maximum of a weft thread tension force arises. We deduce formulas for this maximum of tension force, which we use as a basis for resolving of a problem of compensator function optimisation with the aim of to reduce a weft thread tension. Results of theoretical consideration and weft thread tension measurements are reported below.
Simulación numérica del índice de lesión encefálica provocado por un accidente vehicular en diferentes escenarios de colisión
Authors: Cortés-Vásquez Omar , Cruz-Jaramillo Iván Lenin , Torres-San Miguel Christopher René , Reyes-Jiménez Gustavo Adrián , Verduzco-Cedeño Víctor Fernando , Rodríguez-Martínez Rafael , Romero-Ángeles Beatriz , Urriolagoitia-Sosa Guillermo
Published: January 2024

Este trabajo se centra en el estudio de los efectos resultantes tras un accidente automovilístico y específicamente en el Criterio de Lesión Encefálica (HIC, por sus siglas en ingles). Utilizando dos modelos numéricos diferentes de maniquí y representados en condiciones diferentes de acuerdo a las características propias para cada evento. Para el primer caso, se tiene un infante de 6 años bajo el efecto de una colisión vehicular frontal empleando un asiento porta infante en dirección del sentido de la marcha del vehículo. Para tal efecto, se incluyó un cinturón de seguridad del automóvil y el pretensor de 5 puntos que incluye la silla porta infante para visualizar los efectos de la silla perfectamente instalada y cuando no está adecuadamente anclada al vehículo. Para el segundo escenario, se busca evaluar la agresividad de los frontales de los vehículos de acuerdo a su geometría y composición. Donde la obtención de parámetros biomecánicos, como: fuerza, velocidad y aceleración son fundamentales para determinar el daño producido en el peatón. Los análisis numéricos presentados en este trabajo se desarrollaron bajo las directivas establecidas por la Canadian Motor Vehicle Safety Standard 208 y la United States Federal Motors Vehicle Safety Standard. Con valores de HIC obtenidos, es posible establecer las bases y teorías capaces de predecir los daños que sufrirá cada uno de los casos estudiados.
Financial Analysis for Land Reinforcement Project to Optimize Dump Capacity INL Pit Case: Coal Mining Company PT. XYZ East Kalimantan
Authors:   School of Business and Management, Institut Teknologi Bandung, Mardianti Mardianti , Nainggolan Yunieta Anny ,   School of Business and Management, Institut Teknologi Bandung
Published: January 2024

PT XYZ, a leading coal mining company in Indonesia located in East Kalimantan, boasts a production capacity of 55 million tonnes annually. Engaging in coal mining and sales for domestic and international clients across diverse industrial sectors, PT XYZ’s INL Area plays a pivotal role in its production for the next eight years, producing low-quality coal with an average calorific value of 4200 Kcal/kg GAR. As a cost leadership business, the company prioritizes cost efficiency, particularly in fuel consumption, notably for overburden movement. To enhance efficiency, PT XYZ explores the optimization of the distance from the mining front of the INL pit to the waste dump. A financial analysis case study compares two scenarios using a financial model: Scenario A, utilizing the recent waste dump with a cycle time of approximately 6.7 km, and Scenario B, proposing a new waste dump design with an investment in borepile reinforcement to accommodate overburden removal for the INL pit, resulting in a reduced cycle time of around 5 km. The financial model assesses feasibility parameters such as NPV, IRR, PI, and PBP between the scenarios, conducting scenario analysis to measure project success probability and identify significant variables affecting project feasibility. A Rsik Analysis on the project considers coal price realization and fuel consumption as key variables influencing the project’s value. The recommended option is Scenario B, presenting higher value for PT XYZ, with an investment in borepile reinforcement yielding a potential NPV of around $144.24 million, an IRR of 33%, and a PBV of 4.2 years.
Optimizing Employee Retention: Exploring the Impact of LeaderMember Exchange on Work Intentions with Job Satisfaction and Organizational Commitment as Mediating Variables
Authors:   Faculty of Economics and Business, University of Lampung, Yusuf Syahrial , Ribhan Ribhan ,   Faculty of Economics and Business, University of Lampung, Mardiana Nova ,   Faculty of Economics and Business, University of Lampung
Published: January 2024

This research explores the influence of Leader-Member Exchange (LMX) on work intentions, with job satisfaction and organizational commitment as mediating variables. The study sample comprises 200 Retail Sales Promotion Representatives (SPB/SPG) in Mall Bandar Lampung City, Indonesia. Data collection utilized a questionnaire based on purposive sampling techniques and was analyzed using Structural Equation Modeling (SEM) through the AMOS application. The findings reveal that LMX positively affects job satisfaction, positively influences organizational commitment, and has a negative impact on work intentions. Job satisfaction mediates the relationship between LMX and work intentions, while organizational commitment mediates the relationship between LMX and work intentions. This research provides insights into the dynamic relationship between leaders and team members, highlighting its impact on job satisfaction, organizational commitment, and ultimately work intentions. The study has the potential to enrich our understanding of factors influencing employee retention.
The Relationship of Socio-Economic Characteristics with the Implementation of the main Tasks of Agricultural Extension Workers
Authors:   Faculty of Agriculture, Universitas Negeri Gorontalo, Indonesia, Ikbal Bahua Mohamad
Published: January 2024

Individual characteristics are personal factors related to all aspects of life that are influenced by behavior, environment, and individual interaction. Socioeconomic characteristics indicate the resources owned by agricultural extension workers to carry out extension services in accordance with their abilities that can affect the main tasks of agricultural extension workers. The purpose of this study is to analyze the correlation between the socioeconomic characteristics of extension workers and the implementation of the main tasks of agricultural extension workers. The research method used is the survey method. Sampling using saturated sample method or census with 48 respondents. The data collection method uses a questionnaire with reference to the Likert scale. The research data were analyzed using Partial Least Square (PLS). The results showed that the socioeconomic characteristics of agricultural extension workers have diversity including; productive age, education, work experience, income, and expenses. The implementation of the main duties of agricultural extension workers in carrying out their duties is quite visible from the average result of the Work Performance Value of 68.70. There is a positive correlation between the social characteristics of agricultural extension workers, age background, and length of time as extension workers with the implementation of the main duties of agricultural extension workers.