bluuebunny/crossref_metadata_2025 huggingface dataset:
Modernisasi Sistem Manajemen Pesantren Dengan SIAP(Sistem Informasi Administrasi Pesantren) Pada Pondok Pesantren Sirojuth Tholibin
Authors: Aedi Ulul , Asep Amaludin
Published: December 2022

Sebagai sebuah lembaga tua, pesantren memiliki sistem pengeolaan yang tardisional. Seiring dengan perkembangan zaman sistem pengelolaan tradisional pesantren banyak mendapat tantangan. Pesantren dituntut untuk dapat bersaing dengan lembaga – lembaga lain yang lebih modern. Eksistensi pesantren bergantung pada kemampuan modernisasi pesantren. Modernisasi pesantren diartikan sebagai penyesuaian pesantren terhadap perkembangan zaman. Sirojuth Tholibin sebagai salah satu pondok pesantren yang melakukan modernisasi baik dari segi pendidikan maupun pengelolaan. Dari segi pendidikan Sirbin menyusun kurikulum dengan jenjang pendidikan yang jelas. Dalam segi pengelolaan Sirbin membangun dan menerapkan sistem SIAP ( Sistem Informasi Administrasi Pesantren). SIAP dapat mengolah dan memberikan informasi yang akurat dan cepat tentang keseluruhan data santri. Dengan penggunaan SIAP Sirbin mendapatkan banyak kemudahan dan keuntungan. Keuntungan profit didapatkan Sirbin pasca penggunaan SIAP. Modernisasi yang dilakukan oleh Sirbin hanya terbatas pada sektor manajerial saja. Pada sistem pendidikan hanya ada pembaharuan sistem pendidikan berjenjang. Sedang pada sektor lain, seperti metode pengajaran dan kajian kitab kuning sampai saat ini masih dipertahankan. Maka bisa disimpulkan jika Sirbin melakukan penyesuaian dengan tetap mempertahankan ciri khas dari pesantren yang tradisional.
Penataan Perkotaan di Kabupaten Gresik (Analisis RPJMD Kabupaten Gresik dengan Pelaksanaan Perpres No. 59)
Authors: Fuadi Basiq
Published: December 2022

Perkembangan untuk penataan ruang dalam perkotaan selalu berkaitan dengan kebutuhan dan mempertimbangkan dampak serta menyadari akan kebutuhan generasi yang akan datang. sehingga dalam pengelolaan melalui perencanaan, implementasi dan evaluasi kebijakan harus mempersiapkan strategi yang efektif dan terintegrasi. melalui pelaksanaan Perpres No. 59 tahun 2017 tentang SDG's (Sustainable Developement Goals) pentingnya atas komitmennya terhadap pembangunan yang berkelanjutan khususnya di Kabupaten Gresik dalam penataan Ruang Perkotaan dengan Memperkuat upaya untuk melindungi dan menjaga warisan budaya lokal dan warisan historis kebudayaan masa lampau. Sasaran Pelaksanaan, Terwujudnya kota dan kawasan perkotaan layak huni melalui pengembangan kota pusaka berbasis karakter sosial budaya (heritage city).
Hypopharyngeal reconstruction using prelaminated autologous bio-engineered pectoralis major flaps
Authors: Rebrikova I. V. , Vorotelyak E. A. , Rogovaya O. S. , Polyakov A. P. , Mordovskiy A. V. , Ratushny M. V. , Kaprin A. D , Vasiliev A. V.
Published: December 2022

After removal of metastatic malignant tumors of the hypopharynx and larynx, hypopharyngeal defects are formed. To restore the hypopharynx, a mucosa and a muscular component are needed.

The objective of this study is to develop a hypopharyngeal reconstruction technique using prelaminated pectoralis major flap with mucosal epithelium analogue from autologous epithelial layers.

Materials and methods. Nine patients underwent reconstruction of the hypopharynx using bioengineered prelaminated pectoralis major flaps. The mucosa was restored by tissue-engineered autologous epithelial cell layers that were obtained by culturing in vitro cells isolated from skin biopsies that were previously obtained from patients.

Results. Oral nutrition was restored in all cases. Pharyngeal stenosis was detected in one (11%) patient. A stratified squamous epithelium on the pectoral fascia was revealed in 67% of cases at week 2 after prelamination, in 89% of cases at week 4 after reconstruction and in 100% of cases at month 3, 6, 12 and 24 after reconstruction.

Conclusion. Reconstruction using prelaminated bioengineered flaps allows recreating the anatomical integrity and function of the hypopharynx.
IVF pregnancy after kidney transplantation: clinical case and literature review
Authors: Prokopenko E. I. , Guryeva V. M. , Petrukhin V. A. , Krasnopol’skaya K. V. , Burumkulova F. F. , Gubina D. V.
Published: December 2022

Kidney transplantation (KT), the optimal treatment for stage 5 chronic kidney disease (CKD), restores impaired fertility in most women of reproductive age. However, infertility occurs in some patients after successful KT. We present our own experience of overcoming secondary tubal infertility by in vitro fertilization (IVF). The patient was a 36-year-old with a transplanted kidney, who had lost two pregnancies in the past due to severe preeclampsia (PE). After the second attempt on cryo-thawed embryo transfer against the background of hormone replacement therapy, one embryo was transferred into the uterus, resulting in pregnancy. Gestational diabetes mellitus (GDM) was diagnosed in the first trimester, and a diet was prescribed. Immunosuppression with tacrolimus, azathioprine and methylprednisolone, prophylaxis of PE with low molecular weight heparin and antiplatelet drugs were administered during pregnancy. Elective cesarean section was performed at 37–38 weeks and a healthy boy was born, weighing 2760 g (25th percentile), 48 cm tall (36th percentile). A stay in the neonatal intensive care unit was not required. The baby is growing and developing normally, the mother’s renal graft function is satisfactory. So, IVF can be successfully used in post-KT patients with infertility issues, provided that the IVF program is carefully controlled, and the pregnancy is managed in a multidisciplinary manner.
Development of a cannula device for gas fraction removal in surgical drains
Authors: Kuleshov A. P. , Buchnev A. S. , Drobyshev A. A , Esipova O. Yu. , Itkin G. P.
Published: December 2022

The development of low-traumatic surgical drains aimed at maximum possible separation of blood and air, is an important trend in modern medicine. The objective of this work is to create an inexpensive, user-friendly and low-traumatic dynamic blood aspiration system (DBAS). The system allows effective separation of blood and air when drawing blood from a wound under vacuum conditions required for blood aspiration. The operating principle of the system is to separate liquid and gas fractions of the blood-air mixture by modifying the blood intake cannula. The effect is achieved by applying the principles of centrifugal forces of a rotating blood-air flow combined with Archimedes lift forces.
Treatment of chronic liver disease using cell‑engineered constructs: morphofunctional characteristics
Authors: Shagidulin M. Yu. , Onishchenko N. A. , Grechina A. V. , Krasheninnikov M. E. , Nikolskaya A. O. , Volkova E. A. , Mogeiko N. P. , Boiarinova N. A. , Lyundup A. V. , Piavchenko G. A. , Davydova L. I. , Arhipova A. Yu. , Bogush V. G. , Gautier S. V.
Published: December 2022

Objective: to study the effectiveness of correcting the morphofunctional characteristics of the liver in an experimental model of chronic liver disease (CLD), using implanted cell-engineered constructs (CECs).

Materials and methods. Experiments were carried out on male Wistar rats (n = 80) aged 6–8 months with an initial weight of 230–250 g. CLD was modeled by inoculating the rats with 60% CCl4 oil solution for 42 days based on a modified scheme. Microgel based on recombinant spidroin rS1/9 was used as a matrix for CECs fabrication. Allogeneic liver cells (LCs) and multipotent bone marrow-derived mesenchymal stem cells (BM-MSCs) from a healthy donor were used as the cellular component of the CECs. The effectiveness of the corrective effect of the implanted CECs was assessed in an experimental CLD model (n = 60) in two groups of rats: Group 1 (control, n = 20, 1 mL of saline solution was injected into the damaged liver parenchyma) and Group 2 (experimental, n = 40, CECs containing allogenic LCs and BM-MSCs in a 5 : 1 ratio in a volume of 1 mL were implanted into the damaged liver parenchyma). For long-term monitoring of the CEC state, the CECs were labeled by additional inclusion in Cytodex-3. The effectiveness of the regulatory effect of CECs on regenerative processes in the liver was evaluated using biochemical, morphological and morphometric techniques, as well as by flow cytometry at 90 days after implantation.

Results. In the control group, the mortality rate in CLD was 25%. There was no death in the experimental group with CLD after CEC implantation. The CECs were found to have a corrective effect on the biochemical and morphological parameters of the liver in CLD during 90 days of follow-up, with concomitant preservation of structural cellular homeostasis in the implanted CECs. Conclusion. Implantation of CECs in the liver facilitates effective correction of CLD by activating regenerative processes in the damaged liver, which is due to long-term preservation of structural cellular homeostasis in the CECs.
Risk factors in deceased donor liver transplantation: a single centre experience
Authors: Zubenko S. I. , Monakhov A. R. , Boldyrev M. A. , Salimov V. R. , Smolianinova A. D. , Gautier S. V.
Published: December 2022

Deceased brain-dead donor liver transplantation (LT) is a high-risk intervention. The outcome depends on a large number of modifiable and non-modifiable factors. Objective: to analyze our own experience and identify preoperative and perioperative prognostic factors for poor outcomes in LT. Materials and methods. The study included 301 liver transplants performed between January 2016 and December 2021. Donor and recipient characteristics, intraoperative data, perioperative characteristics including laboratory test data, and the nature and frequency of complications were used for the analysis. Results. The 1-, 3- and 5-year recipient survival rates were 91.8%, 85.1%, and 77.9%, respectively; graft survival rates were 90.4%, 83.7%, and 76.7%, respectively. The most significant predictors of poor outcome of LT on the recipient side were biliary stents (HR 7.203, p < 0.01), acutely decompensated cirrhosis (HR 2.52, p = 0.02); in the postoperative period, non-surgical infectious complications (HR 4.592, p < 0.01) and number of reoperations (HR 4.063, p < 0.01). Donor creatinine level (HR 1.004, p = 0.01, one factor analysis; HR 1.004, p = 0.016, multivariate analysis) was the only reliable prognostic negative factor. Conclusion. LT taking into account established risk factors will improve surgery outcomes and help personalize the therapy for each patient.
Biocompatible and functional properties of a microdispersed tissue-specific 3D matrix from decellularized porcine cartilage
Authors: Nemets E. A. , Lazhko A. E. , Grigoriev A. M. , Basok Yu. B. , Kirillova A. D. , Sevastianov V. I.
Published: December 2022

In contrast to decellularization of soft tissues for use as tissue-specific matrices in the creation of tissue-engineered constructs, decellularization of cartilage tissue requires several processing techniques, which can negatively affect the biocompatibility and functional properties of the native extracellular matrix (ECM).

Objective: to study the biocompatible and functional properties of microdispersed tissue-specific 3D matrix from a porcine cartilage that is decellularized by sequential use of chemical, physical and enzymatic techniques.

Materials and methods. For decellularization, microdispersed cartilage particles (MCPs), obtained by cryomilling, were incubated in detergent solutions (sodium dodecyl sulfate and Triton X-100), then treated with supercritical carbon dioxide (scCO2) with 10% ethanol and DNase I. The Ames test (Salmonella typhimurium reverse mutation assay) was used to determine the genotoxicity of decellularized microdispersed cartilage particles (dMCPs). Local and general toxic effects, as well as resorption of dMCPs were studied in vivo on sexually mature outbred rats. Decellularized MCP specimens (10 mg) were implanted into the thigh muscle tissue. Viability of human adipose-derived mesenchymal stem/stromal cells (hAdMSCs), when cultured on dMCPs, was analyzed by in vivo microscopy, stained with fluorescent Calcein AM dye. Cell metabolic activity was assessed using PrestoBlue™ Cell Viability Reagent.

Results. It has been proven that porcine dMCPs implanted in rat muscle after treatment with scCO2 do not exhibit local and general toxic effects, and do not show genotoxicity and negative effects on the reproductive system of animals. After 6 months of in vivo experiment, most (87%) of the implanted decellularized cartilage was resorbed. It was shown that the resulting matrices are able to support adhesion and proliferation of hAdMSCs. Conclusion. Porcine dMCP specimens are suitable for biocompatible medical products in terms of local and general toxic effects, genotoxicity and reproductive toxicity, and can be used as a matrix for creating cell- and tissue-engineered cartilage constructs.
Proofs and Certificates for Max-SAT
Authors: Py Matthieu , Cherif Mohamed Sami , Habet Djamal
Published: December 2022

Current Max-SAT solvers are able to efficiently compute the optimal value of an input instance but they do not provide any certificate of its validity. In this paper, we present a tool, called MS-Builder, which generates certificates for the Max-SAT problem in the particular form of a sequence of equivalence-preserving transformations. To generate a certificate, MS-Builder iteratively calls a SAT oracle to get a SAT resolution refutation which is handled and adapted into a sound refutation for Max-SAT. In particular, we prove that the size of the computed Max-SAT refutation is linear with respect to the size of the initial refutation if it is semi-read-once, tree-like regular, tree-like or semi-tree-like. Additionally, we propose an extendable tool, called MS-Checker, able to verify the validity of any Max-SAT certificate using Max-SAT inference rules. Both tools are evaluated on the unweighted and weighted benchmark instances of the 2020 Max-SAT Evaluation.
Systemic analysis of the expression and prognostic significance of USP31 in endometrial cancer
Authors: Huang Yuzhen , Jiang Peng , Chen Yuting , Wang Jinyu , Yuan Rui
Published: December 2022

Increasing evidence indicates that multiple mechanisms are involved in the metastasis and postoperative recurrence in patients with endometrial cancer (EC). Ubiquitin-specific protease 31 (USP31) has been studied in some human tumors, but its function remains unclear in EC. In this study, we tried to investigate the expression of USP31 in EC and its possible involvement in biological signaling pathways and define its predictive value for the prognosis. Data from The Cancer Genome Atlas (TCGA) and Genotype Tissue Expression (GTEx) databases confirmed the difference in USP31expression between EC and normal endometrium. Specimens and clinical data of 259 patients with EC who underwent primary surgery at the First Affiliated Hospital of Chongqing Medical University were collected. And the independent predictive value of USP31 for the prognosis of EC patients was determined by univariate and multivariate analyses. Kaplan-Meier analysis and receiver operating characteristic curves were used for confirming the ability of USP31 in predicting the prognosis. Functional enrichment analyses were used for finding the hub genes associated with USP31 and to predict the biological signaling pathways that might be involved. Our study confirms that EC patients with low expression of USP31 may have a worse prognosis. Functional annotations suggest that USP31 may participate in the mitogen-activated protein kinase signaling pathway, nuclear factor κB pathway, early 2 factor targets, and inflammatory response. USP31 may act as a promising biomarker for research in EC.
Quick DNA Extraction for Fungal Barcoding (X-Amp) v2
Authors: Douglas Russell Stephen
Published: December 2022

Below you will find a simple and fast two-step DNA extraction protocol that works well with many different groups of fungi. This protocol can be utilized in preparation for DNA barcoding of fungi utilizing Oxford Nanopore MinION. Time required: Varies depending on the use case. My samples generally have the metadata and images stored on iNaturalist. For each sample, I go to the iNaturalist observation, validate that the specimen matches the metadata and images, include a unique lab code in the "Voucher Number(s)" observational field, record the lab code on the sample packet with a marker, and record the lab code on the associated spreadsheet in the correct cell number. If all of these actions need to be performed, it can take 3-5 hours per 96 samples to load. If the iNaturalist observations have already been validated, the lab numbers have been assigned, and all that is required is to put a small amount of tissue in each cell for each sample, then the time outlay can be less than 2 hours per 96 samples. Limitations on Protocol: There are a number of species groups that will have lower success rates with this protocol. They will either need a more complex DNA extraction protocol that involves grinding, or different primer combinations. Low success rates (0-20% of specimens): Cantharellus, Helvella, Strobilomyces, Ophiocordyceps, Panellus Moderate success rates (20-60% of specimens): Recalcitrant crusts & polypores, Cuphophyllus, Neohygrocybe, Tylopilus, Xylaria, Hypoxylaceae, Nidulariaceae Overall, for a mix of general collections, we typically have success rates of 85-95% of specimens. The lowest success rate seen thus far for general collections was from MO-NAMA 2022, which had 75% success, despite being heavy on crust fungi and low-quality specimens.
Study on surface crack detection of ferromagnetic materials based on remanence
Authors: Feng Jiarui , Yao Entao , Wang Ping , Shi Yu
Published: December 2022

Remanence detection is a technique of electromagnetic non-destructive testing (NDT). This paper studies a quantitative detection method for surface cracks of ferromagnetic materials based on remanence. The finite element analysis software COMSOL Multiphysics was used to establish the
remanence detection model and the 'moving grid' function was used to realise the simulation of the remanence signal. The leakage magnetic field occurs due to the distortion of the magnetic induction lines near the surface cracks after ferromagnetic materials are magnetised. Remanence detection
uses the leakage magnetic field to detect cracks. The relationship of the leakage magnetic field versus the crack depth and width was analysed using the magnetic dipole model. The relationship between the crack size and the remanence signal was verified by measuring the surface remanence signal
of cracks of different sizes. The characteristic parameters related to the crack size were extracted and the regression model between the characteristic parameters and the crack size was established. For the remanence detection, the maximum error of width prediction was 16.25% and the maximum
error of depth prediction was 18.48%. For the magnetic flux leakage (MFL) detection, the maximum error of width prediction was 12.1% and the maximum error of depth prediction was 12.32%. Under the same experimental conditions, the maximum error of crack width measurement of remanence detection
was 4.15% larger than that of MFL detection and the maximum error of depth was 6.16% larger than that of MFL detection.
A feature extraction method based on moving multi-scale reconstruction and interactive energy entropy for gear fault diagnosis
Authors: Hu Zhihui , Xu Zhihai , Wang Gongxian , Xiang Lei
Published: December 2022

In order to accurately extract the sensitive features representing the type and severity of gear faults through the vibration signal, a gear fault diagnosis method using moving multi-scale reconstruction-based interactive energy entropy (MMS-IEE) is proposed. The gear vibration signal
is reconstructed using a multi-scale mean at different scales and adjacent data points are used to form a sliding window, which makes the information extraction from the vibration signals sufficient. The energy distributions of the original signal and the reconstructed signal under different
scale channels are calculated. Compared with the traditional energy entropy (EE) method, the feature vector obtained by the interactive superposition method can more accurately represent the energy mutation of the time-series caused by the fault. Experimental results show that the proposed
MMS-IEE method has a strong fault feature extraction ability and high gear fault diagnostic accuracy under different speeds and working conditions.
Islamic Parenting Model to Increase Family Literacy: A Mixed Method Study
Authors: Purwandari Septiyati , Husna Aftina Nurul , Tawil Tawil
Published: December 2022

This study aims to test the effectiveness of a new model of Islamic parenting based on family religiousness to solve the low literacy issue in Muslim families. Using a mixed method with triangulation design, in Study 1, the researchers conducted action research by delivering six sessions parent training program to 10 women with children aged ±11 years old, grouped into high and low-literate families. Each session was followed with practice at home guided by facilitators. Data were collected using interviews and parents’ reflection journals and were analyzed using content analysis. In Study 2, concurrent to Study 1, we conducted quasi-experimental research using one group pre-test and post-test design to test the model’s effectiveness. Before and after the programs, we administered the Family Literacy Questionnaire to the women and the Literacy Activity Questionnaire to their children. The data were analyzed using Wilcoxon signed rank test to test differences between pre-test and post-test scores. The program was perceived as impactful and highly appreciated by the participants, who expected its continuation in the future. The Islamic parenting model effectively enhanced women’s family literacy in low literacy groups and children’s literacy activity in both groups.
Fear of COVID-19 and Anxiety in the Arabic Language Learners in Kuala Lumpur
Authors: Mokhtar Mohd Ieruwan Mohamed
Published: December 2022

The coronavirus disease 2019 (COVID-19) pandemic contributed to distress and affected mental health in many sectors, including education, which triggered fear and anxiety among learners and educators. Therefore, this research aimed to perceive mental health issues such as fear, stress, and anxiety during the pandemic, especially among learners aged between 15 to 25 from Kuala Lumpur, Malaysia. The questionnaire consisted of seven questions related to the Fear of COVID-19 Scale (FCV-19S). The respondents were invited to participate via social media platforms such as WhatsApp, Telegram, Emails, and Facebook. The link to the Google form was given to them to allow them to join the survey. Three hundred twenty-four respondents from Kuala Lumpur, Malaysia, participated in this survey to show their anxiety levels during this pandemic. The findings showed that the level of fear of COVID-19 was high and significant by using SPSS version 26. It also constructed mental health issues among the learners, decreasing their performance in education. This research is applicable to distinguish and describe the fear of the COVID-19 pandemic, which influences learners’ mental health. The findings also revealed that fear and anxiety were high and affected students’ performance.
The Effect of Spiritual Intelligence and Religious Faith on Self-Regulation
Authors: Utami Lufiana Harnany , Mingtio Sandi Marahhul , Muhid Abdul
Published: December 2022

Most Muslims find it hard to memorize the Qur’an due to certain factors. This research explored the effect of spiritual intelligence and religious faith on self-regulation. Having   quantitative design, three instruments were used in this analysis; self-regulation scale (S-SR) (α=0.621), religious faith scale (S-RF) (α=0.986), and spiritual intelligence scale (S-SI) (α=0.890).  Four hundred (400) students in the tahfiz Al-Qur’an program from some Islamic boarding schools in Surabaya were selected through purposive sampling. The results from multiple regression showed that spiritual intelligence and religious faith significantly predicted self-regulation. In other words, both spiritual intelligence and religious faith had a positive effect on self-regulation. Besides, spiritual intelligence also positively affected self-regulation. The more positive students assessed their spiritual intelligence, the higher their self-regulation. That self-regulation then made students get more engaged with their activity of memorizing the Quran.
“We are America’s Number One Enemy”: The Experiences of Middle Eastern Muslim Men College Students Navigating Higher Education in the United States
Authors: Salinas Jr Cristobal , Coulson-Johnston Katherine E. , Handoush Malik J. , Barakat Maysaa , Ilyas Zakia , Graham Domique
Published: December 2022

Muslim students in higher education are affected by the hardships of oppression, discrimination, prejudices, and stereotypes associated with the increasing Islamophobia and xenophobia within the U.S. The current literature on Middle Eastern Muslim men college students lacks an understanding of their lived experiences on U.S. college campuses. The purpose of this study is to understand how Middle Eastern Muslim men college students navigate a university within a divisive political context. This phenomenological study conducted semi-structured interviews with seven Middle Eastern Muslim men students. Data gathered informs how participants of this study made sense of their experience navigating higher education institutions. The findings describe that Middle Eastern Muslim men college students must fight negative perceptions, face the challenge of feeling alone socially and academically, and commit to education with the support of their families. After the findings, this paper provides a discussion and a list of recommendations for research and practice to be inclusive and elevate the lived experiences of Middle Eastern Muslim men students in higher education. While this study took place in the U.S., the discussion and recommendations apply to all colleges and universities worldwide.
Percepción de una estrategia educativa gamificada en modalidad de presencialidad remota
Authors: Ramirez-Gómez Gonzalo
Published: December 2022

El propósito de este trabajo es presentar los hallazgos en el desarrollo de una estrategia gamificada aplicada a la educación en la modalidad de presencialidad remota. La estrategia se desarrolló en el segundo semestre académico de 2020 en la UIS en el cual surge la necesidad de integrar métodos y técnicas de enseñanza alternativas a los utilizados en la enseñanza presencial.
Aula invertida en clases de ingeniería
Authors: García-Sánchez Gabriel Fernando
Published: December 2022

Tradicionalmente, el proceso de enseñanza de varias asignaturas ingenieriles se compone de dos momentos principales: la explicación de conceptos teóricos, que usualmente se realiza por medio de exposiciones magistrales, y la aplicación de dichos conceptos mediante la resolución de problemas. En este último momento suelen surgir la mayor cantidad de dudas en los estudiantes por lo que requieren de una mayor orientación, sin embargo, el gran tiempo que toman las explicaciones teóricas deja poco tiempo para esto durante la clase. En este trabajo se aplicó la metodología de aula invertida en una materia de ingeniería mecánica de manera que, por medio de un aprendizaje basado en problemas con mayor orientación docente, se logre un aprendizaje más significativo y eficiente de la misma.
Herramienta didáctica e interactiva usando macros (VBA) de Excel, a partir de un banco de talleres de lectura de procesos industriales para la asignatura Estequiometría
Authors: Rodríguez-Barrera Jeisson Fabian , Infante-Diaz Cristian Jhaidiver , Vargas-Zárate Julian Enrique
Published: December 2022

La asignatura Estequiometría es la entrada al mundo de la Ingeniería Química y representa la base de los conocimientos que permiten tener una visión más amplia y concreta de la profesión. El objetivo de este trabajo es desarrollar una herramienta didáctica que permita fortalecer el análisis y la interpretación de diferentes procesos industriales. El uso de esta herramienta es una ayuda para los estudiantes que ingresan al mundo de la ingeniería química, y en general para fortalecer el aprendizaje de la comunidad universitaria afín con este tipo de procesos.
Finite difference and finite element methods for partial differential equations on fractals
Authors: Contreras Luis F. , Galvis Juan
Published: December 2022

In this paper, we present numerical procedures to compute solutions of partial differential equations posed on fractals. In particular, we consider the strong form of the equation using standard graph Laplacian matrices and also weak forms of the equation derived using standard length or área measure on a discrete approximation of the fractal set. We then introduce a numerical procedure to normalize the obtained diffusions, that is, a way to compute the renormalization constant needed in the definitions of the actual partial differential equation on the fractal set. A particular case that is studied in detail is the solution of the Dirichlet problem in the Sierpinski triangle. Other examples are also presented including a non-planar Hata tree.
Conocimientos, actitudes y prácticas sobre la enfermedad de Chagas en una zona endémica de Boyacá, Colombia
Authors: Ramírez-López Laura Ximena , Monroy-Díaz Ángela Liliana , Rodríguez Sonia Patricia , Bonilla-Arévalo Danna Gabriela , Suescún-Carrero Sandra Helena
Published: December 2022

Introducción: el uso de instrumentos para la obtención de información sobre los conocimientos, actitudes y prácticas de diversas enfermedades son ampliamente utilizados, permiten obtener información clara y detallada de cada uno de los aspectos a indagar. Objetivo: Determinar conocimientos, actitudes y prácticas de la enfermedad de Chagas en una zona endémica de Boyacá, Colombia. Métodos: Estudio transversal prospectivo que consistió en aplicar un instrumento validado que abordaba datos sociodemográficos, factores epidemiológicos, conocimientos, actitudes y prácticas de la enfermedad de Chagas en un integrante mayor de edad de 341 familias de Miraflores, Boyacá. Se emplearon escalas: óptimo, bueno, regular y malo; para el análisis bivariado se determinó el nivel de conocimientos, actitudes y prácticas con escala favorable y desfavorable. Se determinaron diferencias significativas de factores de riesgo, conocimientos, actitudes y prácticas de la enfermedad entre el grupo de hombres y mujeres encuestados. Resultados. El 68,6% de la población nació en Miraflores, con un 48% de escolaridad primaria y pertenecientes a la zona rural en su mayoría (57,2%); en las mujeres predomina la ocupación de ama de casa, en los hombres es más frecuente la agricultura. Se identificaron conocimientos (48,1%) y actitudes (82,1%) óptimas sobre la enfermedad de Chagas que minimizan el riesgo de contraer la infección por T. cruzi; paradójicamente, se encontraron malas prácticas (61,9%) en el hogar que no previenen la enfermedad. Se observó significancia respecto al nivel de escolaridad bajo, sexo femenino, ser menor de 49 años, vivir en zona urbana y actividades del hogar, todo lo anterior permite un conocimiento favorable acerca de la enfermedad de Chagas, aunque sin evidencia estadística. Conclusión: Se hace necesario incorporar programas que garanticen el aprendizaje y la implementación de actitudes y prácticas favorables contra la enfermedad en habitantes de zonas endémicas.
Experimental Investigation of Adding a Personal Ventilation System as Combined with Hybrid Ventilation System During Isolated Office Rooms
Authors: Yakoop Asmaa Khudhair , Yassen Wurood , Hwalah Safaa Mohammed , Mahdi Ala'a Abbas , Al-Amirb Qusay Rasheed
Published: December 2022

Studying the effect of adding a ventilation system consisting of two devices, impinging and personal ventilation, and knowing the extent of their impact on the presence of different thermal loads represented by humans, computers, and light inside a thermally isolated office room by using sandwich panels. In addition, examining the air distribution inside a room also found the required thermal comfort for two people who were represented in the form of the thermal manikin and inside them a heat source close to 80 watts, which is close to the heat emitted by the human being according to the global A share. The most important results that were obtained first when adding the personal ventilation system to the impinging ventilation showed a clear improvement in heat levels close to the thermal manikin at a level of 1.1 meters and above. Second, the homogeneity of temperatures within the space, where the difference between the main source of ventilation (impinging) and the heat at the level of 1.8 meters is relatively small, compared to the use of the impinging ventilation system alone. The aim of the research is to prove the efficiency of such a system within the Iraqi summer weather between march to June month, under the conditions studied during this project, energy savings can be achieved using this strategy. Providing respiratory and thermal comfort inside the air-conditioned space, especially in the people’s seating area at 1.1 meters, and achieving two goals of sustainable development (an industry with innovation and clean with affordable energy).
Numerical Study on Transient Flow of Micropolar Fluid in a Non-Darcy Porous Medium in the Presence of Magnetic Field
Authors: Islam Ariful , Das Badhan , Ali Lasker Ershad , Rahman Md. Azizur
Published: December 2022

A computational analysis on transient magnetohydrodynamics micropolar fluid flow through a non-Darcy porous medium has been investigated. A computer code based on finite difference technique was developed in Fortran programming language with the objective to analyze the behavior of fluid flow in a porous medium for the non-Darcy case. Two-dimensional mathematical model of the problem has been utilized to obtain the non-similar solutions. The finite difference technique was used to explicitly solve the dimensionless equations of fluid velocity, temperature, angular velocity, and concentration to study the behavior of the system for various parameters. In addition, the stability of the system has been performed and obtained that the system converged for the values of Prandtl and Schmidt number greater than and equal to 0.03. The behavior of the system was studied for non-dimensional time ranging from 0 to 80 for a small-time step of 0.005. The most significant influence of various parameters on fluid velocity, temperature, angular velocity, and concentration profiles within the boundary layer have represented graphically and discussed qualitatively. It was found that the system reached to a steady state at the time greater than or equal to 75.
Carbon Footprint Tracking and Quantitative Analysis Model for Power Industry Based on Thermodynamics
Authors: Hu Wei , Xia Xue
Published: December 2022

Since the concept of carbon asset is still new to most power enterprises, they generally lack the knowledge and experience of carbon asset management, to help them cope with the related works, this paper proposes a carbon footprint tracking and quantitative analysis model for power enterprises based on thermodynamics. At first, by employing thermodynamic theories, this paper established an inventory model through the measurement and calculation of carbon concentration and carbon emissions, which can fix defective items, improve inventory efficiency, and save inventory cost. Then, the paper used thermo-economics and the TOPSIS method to construct a carbon inventory index system containing indexes such as carbon exergy ratio and regulation interval, which can reduce the error of carbon emission intensity and update the carbon account information in a timely manner. After that, the carbon footprint was calculated by coupling the carbon thermal map with the multi-dimensional evaluation mechanism, thereby achieving accurate control of carbon emissions and realizing the energy-saving and emission-reduction goals. At last, the attained experimental results showed that, the proposed carbon inventory measurement model established based on thermodynamics can effectively regulate the emission behavior of power enterprises, help achieve the ultimate purposes of reducing cost, increasing efficiency, and optimizing environment. The work done in this paper could provide theoretical support for making decisions for the smooth development of carbon rights market in China.
Heat Transfer and Mixed Convection Flow of Non-Newtonian Thermo-Dependent Power Law Fluids with Thermal Radiation Effect
Authors: Erritali Ilham , Kaddiri Mourad , Arroub Ismail , Daghab Hamza
Published: December 2022

The current study explores numerically mixed convection of thermo-dependent power-law fluids in a square lid-driven enclosure, including the thermal radiation effect. The vertical sidewalls are sustained at both hot and cold temperatures. On the other hand, the cavity is insulated from the horizontal walls. The upper wall is moving along the x-axis. The main governing equations that the Boussinesq approximation is used for are solved using the finite difference method. The simulations focus on the effects of multiple pertinent parameters, including the Richardson number. (Ri = 0.1, 1, 10 and 100), thermal radiation parameter (Rd = 0 and 10), power-law index (0.6 ≤ n ≤ 1.4) and the Pearson number (0 ≤ m ≤ 6). The findings reveal that improving the Richardson number reduces heat transfer. Then, increasing Rd results in a domination of heat conduction for a fluid having a higher thermal conductivity. Also, the growth in the power law-index reduces heat transfer while improving convective flow. Finally, increasing the Pearson number improves the convective flow rate and also the average Nusselt number.
A Method for Detection of Fire Source Positions in High-Temperature Areas
Authors: Shang Yuyang
Published: December 2022

Spontaneous combustion of coal is an important disaster that needs to be addressed in the coal mine production process. Since its ignition position is often unknown and concealed, determining the ignition position in the goaf is of great significance to the work safety of the mining area. This study measured the thermal conductivity of coal samples using the spherical thermal conductivity model, and obtains the fitting relationship between the thermal conductivity, the heating voltage U and the inner sphere outer wall temperature t1 by inputting different voltages, and the correlation coefficient R2 was all greater than 0.99. Through analysis of the spherical geometric model, it was determined that the ignition point was at the vertical depth of 16.542m from the highest temperature point in the goaf, and that the distance from the ignition position to the ignition source ranged between 13.49m to 1.03m when the temperature in the goaf was 60℃ to 1700℃. Through comparison with the actual data, the error was found to be 4.7%, indicating that the proposed model was more accurate. Finally, it was found that the thermal conductivity of coal is closely related to the porosity, degree of metamorphism and inhomogeneity of the medium.
Analysis of Heat and Moisture Transfer and Thermal Comfort in Green Logistics Storage Space
Authors: Wang Xiangdong , Lu Zijia
Published: December 2022

Regular logistics storage spaces suffer a very high temperature during summer. To build a green logistics storage space, it is truly necessary to optimize the thermal environment in summer. At present, there are few related studies on the energy consumption, thermal environment and human comfort of green logistics storage spaces. Therefore, this paper analyzes the heat and moisture transfer in and studies the impacts of the thermal environment of green logistics storage space. Based on the survey results, a coupled heat-moisture transfer model of green logistics storage space was constructed, which consists of three parts - the envelope structure, the hot and humid indoor environment, and the heating, ventilation and air conditioning (HVAC) system. Based on the idea of linear regression, a model was established to predict human body’s subjective thermal sensation in green logistics storage space. The experiment showed the analysis results of heat and moisture transfer and thermal comfort in green logistics storage space, and verified the effectiveness of the proposed model.
Comparative Study of TiO2 Nanoparticles and Alcoholic Fuel Additives-Biodiesel-Diesel Blend for Combustion, Performance, and Emission Improvements
Authors: Pullagura Gandhi , Bikkavolu Jogarao , Vadapalli Srinivas , Chebattina Kodanda Rama Rao , Kuchipudi Viswadeepika
Published: December 2022

In the current research, the engine performance, combustion, and emission parameters of biodiesel mixture 20% Tamarind oil methyl ester and 80% Diesel (B20) with the inclusion of titanium dioxide (TiO2) in different concentrations (25.50 and 75 ppm) and 10% v/v dimethyl carbonate (DMC) as fuel additive investigated using a single-cylinder, 4-stroke, direct injection (DI), compression ignition (CI) engine. The nano fuel blends were prepared through the ultrasonication process. The ratio of 1:4 TiO2: QPAN80 was produced higher stability and consistency out of five trials. TiO2 were characterized using FESEM, HR-TEM, Fourier Transform Infrared (FTIR), and X-Ray diffraction. Fuel properties were determined as per the ASTM standards. Engine tests were carried out to determine the engine performance under varied loads such as 25, 50, 75, and 100% while keeping a uniform speed of 1500 rpm. The maximum reduction in BSFC, CO, HC, and NOx were found to be 17.64%, 9.49%, 7.81%, and 6.53%, and the increased BTE was observed to be 6.13% for B20T50DMC10 compared to B20 blend at full load. Thus, the combined effect of TiO2 and DMC served excellent engine performance, combustion, and emission characteristics in CI engine operation.
Experimental Investigation on Improving Lifetime of Peripheral Pump Impeller under Cavitation Using Different Techniques
Authors: Mohsin Aveen T. , Yaqob Banipal N.
Published: December 2022

The industry is becoming more interested in peripheral pumps because they are inexpensive, have low specific speeds, and are small. One of the more serious problems that may occur with any pump is cavitation. That has a significant impact on pump components, particularly the impeller. This work presents a detailed experimental study on prolonging impeller lifespan under cavitation conditions by studying the effect of impeller surface finishing and coatings on its lifetime. For this purpose, seven impellers, in addition to the original one of the peripheral pump, had prepared and treated. Three impellers with three different levels of arithmetic surface roughness (Ra) were produced using a low-cost and customizable hand grinding procedure. And four impellers have been coated thermally with four different erosion-resistant composite materials. All of the impellers were cavitated for 300 minutes at normal and one at high water temperatures. The result showed that the mass loss percentages with the smallest (Ra) of 0.35µm, and coated with yellow epoxy were 84.86% and 48.50% lower than the original impeller, respectively. Thus, improving the quality of impeller surface finishing, and thermal coatings are excellent method for increasing the impeller's cavitation erosion resistance and thereby extending its lifetime.
Thermal Performance of Double Slope Collectors with Different Angles
Authors: Ayaal Adel H.
Published: December 2022

The air solar collectors are one of the necessary equipment for heating by increase the induced air temperatures. The thermal analysis of the solar air collector for the three different absorbers, flat and double slope (15, 30) degrees was studied numerically by employing a FORTRAN 90 program. The 3D steady-state forced convection turbulent technique was used to solve the Navier-Stokes with energy equations. The turbulence effect was modeled by using k-ε two equation model. The discretization of governing equations was done by finite volume technique. The test is carried out under the weather conditions of the Baghdad-Iraq region during the month of Jun. The results exhibit that the air temperatures increase when used the double slope collector, also the performance of air solar collector is enhanced thermally. The average 15° angle plate is higher than the flat and the 30° angle plates from 8am to 11am and from 1pm to 6pm, it is best slope angle.
A New Control Strategy for Greenhouse Environment Control System Based on Inverse Model
Authors: Shi Jianfei , Li Mingze , Tong Baihong , Guo Zhenlin
Published: December 2022

The greenhouse environment control system is a type of non-linear system since the temperature and humidity of the system are highly coupled. Besides, the time lag of the temperature and humidity control process is large, so it’s quite difficult to linearize and decouple the temperature and humidity of the system. To cope with this issue, this paper proposed a novel control strategy for greenhouse environment control system based on Back Propagation Neural Network (BPNN) and inverse model, the proposed method can perform inverse identification on the temperature and humidity control system to attain higher accuracy. Then, the inverse model and the original system were connected in series to form a pseudo linear system to realize the decoupled control of temperature and humidity. After that, aiming at the impact of some non-linear factors on the greenhouse environment system, this paper adopted the adaptive fuzzy Proportion Integration Differentiation (PID) controller to enhance the adaptability of the system, thereby reducing control error and the interference caused by non-linear factors of the temperature and humidity control system. At last, the experimental results showed that, the temperature error of the system could be controlled within 1.2℃ and the error of relative humidity was less than 2.5%. The proposed method can improve the control effect of the greenhouse environment to a certain extent, and it provides a novel approach of greenhouse control.
Evaluation and Analysis of an Agro-Based Nano Refrigerant to Improve the Performance of a Domestic Refrigeration System
Authors: Afolalu Sunday A. , Ikumapayi Omolayo M. , Ogedengbe Temitayo S. , Adegbenjo Abayomi , Jen Tien-Chien
Published: December 2022

The use of nanoparticles along with the conventional refrigerant in a vapor compression cycle is relatively a new idea, where nano-refrigerants are found to have improved thermo-physical properties over the conventional refrigerants. Nano-refrigerant is the combination of nanoparticles with the refrigerant to improve the performance of the refrigeration process. In this study, a developed nanofluid from agricultural source (rice husk) was applied in a domestic refrigerator and its performance investigated. The pre-developed nanofluid which was prepared using the synthesis, centrifugation and calcinations processes was administered in the compressor of the refrigerator at concentrations of 0.2wt%, 0.3wt%, 0.5wt% and 0.6wt% to form a mix with refrigerant R600a used in the compressor (as control) and allowed to run for 4 hours. Performance evaluation was measured using parameters such as pull down time, discharge temperature and coefficient of performance (COP). Results show an increase in the COP by 31, 23 and 35% compared to the control sample for the 0.2wt%, 0.3wt% and 0.5wt% concentrations respectively. The sample 0.6wt% and 0.5wt% showed the best pull down time with temperatures of -6.1 and -3.1℃ at 240 minutes respectively and a reduced discharge temperature of 7-16% by the 0.2wt%, 0.3wt% and 0.5wt% concentrations in respect to the control sample. Hence, the use of rice husk based nanofliud resulted in an enhanced performance for the domestic refrigerator.