bluuebunny/crossref_metadata_2025 huggingface dataset:
Engagement With Tailored Physical Activity Content: Secondary Findings From the Families Improving Together for Weight Loss Randomized Controlled Trial (Preprint)
Authors: Sweeney Allison M , Wilson Dawn K , Resnicow Kenneth , Van Horn M Lee , Kitzman Heather
Published: April 2023

BACKGROUND

Web-based tailored interventions offer rich opportunities for improved access to and personalization of behavioral interventions. However, despite the promise of this approach, the engagement and underrepresentation of minority groups remain major issues.

OBJECTIVE

This study evaluated whether engagement (log-in status and log-in duration) with different types of tailored behavioral content from the Families Improving Together for weight loss web-based intervention was associated with changes in moderate to vigorous physical activity (MVPA) among African American families with overweight or obesity.

METHODS

Parent-adolescent dyads were randomized to a web-based tailored intervention or web-based health education comparison program. The web-based intervention (N=119) was completed by parents and targeted 6 weight-related behaviors to support their adolescent children’s weight loss goals (session contents included energy balance, fast food, fruits and vegetables, physical activity [PA], sedentary behavior, and sweetened beverages). MVPA was measured using accelerometers at baseline and after the intervention.

RESULTS

Using a hierarchical approach, the log-in status and duration for each web-based session were used to evaluate the additive effects of engagement with different types of tailored behavioral content on MVPA after the web-based intervention. Among parents, logging in to the PA session was not associated with greater MVPA (B=−12.561, 95% CI −18.759 to −6.367), but MVPA increased with greater log-in duration for the PA (B=0.008, 95% CI 0.004-0.012) and sedentary behavior (B= 0.008, 95% CI 0.004-0.012) sessions. These results suggest that parents who logged in to the PA session had lower MVPA, but MVPA increased with greater log-in duration for the PA and sedentary behavior sessions. These associations remained even after accounting for engagement with other content sessions. However, these engagement effects did not translate to the adolescents.

CONCLUSIONS

The results of this study highlight the need to disentangle the impact of engagement with different tailored content to improve the efficacy of tailored web-based interventions, especially for promoting PA in African American families.

CLINICALTRIAL

ClinicalTrials.gov NCT01796067; https://clinicaltrials.gov/ct2/show/NCT01796067
CABEX 2023: СОЮЗ ПРОИЗВОДСТВА И КАБЕЛЬНОЙ НАУКИ
Authors: Попов С.А.
Published: April 2023

С 14 по 16 марта уже в третий раз на площадке ЦВК "Экспоцентр" состоя­лась Международная выставка кабельно-проводниковой продукции, оборудования и материалов для ее производства Cabex 2023 – ведущее ежегодное бизнес-мероприятие кабельной отрасли страны. По хорошей традиции одной его ключевых составляющих стала научно-техническая конференция "Кабельная промышленность – Наука. Техника. Производство", организованная ОАО "ВНИИКП", Ассоциацией "Электрокабель" и Академией электротехнических наук РФ.
МЕТОДЫ УПРОЩЕНИЯ МОНТАЖА МОДУЛЬНЫХ ПАНЕЛЕЙ СКС
Authors: Семенов А.Б.
Published: April 2023

Рассмотрены технологические приемы и конструктивные решения, обеспечивающие увеличение эффективности монтажа модульных коммутационных панелей в технических помещениях структурированных кабельных систем. Показана возможность решения задачи упрощения монтажа по трем основным направлениям: изменение технологии монтажа, целенаправленная модернизация панели и применение технологических приспособлений.
КАБЕЛЬНАЯ КОНФЕРЕНЦИЯ В СТОЛИЦЕ РЕСПУБЛИКИ МОРДОВИЯ
Authors: Попов С.А.
Published: April 2023

16−17 февраля в Саранске в восьмой раз прошла международная научно-техническая конференция OOO "Сарансккабель-Оптика", входящего в Группу компаний "Оптикэнерго". Состоявшееся в Технопарке "Мордовия" событие собрало примерно 130 участников из 25 городов России, Беларуси, Казахстана и Кыргызстана. В этом году девиз конференции был обозначен как "ИДИ вперед, не стой на месте!" Инновации, диверсификация, импортозамещение − три основных принципа, на которых сегодня основывает свою деятельность весь холдинг "Оптикэнерго". Аббревиатура от этих слов образует символичное слово ИДИ. Постоянное движение вперед, развитие, поиск, достижение целей − это залог выживания и удержания на плаву в современном мире.
ВСЕМИРНЫЙ КОНГРЕСС MWC BARCELONA 2023: МЕТАВСЕЛЕННАЯ – УГРОЗЫ И ВЫЗОВЫ ДЛЯ МИРА ТЕЛЕКОМА
Authors: Тихвинский В.О. , Девяткин Е.Е.
Published: April 2023

С 27 февраля по 2 марта 2023 года в г. Барселона (Испания) в очередной раз прошел Всемирный мобильный конгресс и выставка MWC Barcelona 2023, организатором которых традиционно выступила GSMA (Всемирная ассоциация операторов GSM).
ЭВОЛЮЦИЯ ТЕХНОЛОГИЙ СЕТИ FRMCS В РЕЛИЗАХ 3GPP: ВЫЗОВЫ И ПЕРСПЕКТИВЫ
Authors: Тихвинский В.О. , Портной С.Л. , Сивицкий П.А. , Тихонюк А.И.
Published: April 2023

Сделан обзор технологических инноваций в новых релизах Партнерского проекта 3GPP и европейских исследовательских проектах, применимых для системы железнодорожной связи FRMCS (Future Railway Mobile Communication System). Приведены соображения по быстрейшему развертыванию в РФ системы FRMCS с учетом национальных требований к железнодорожной связи.
ПРОБЛЕМЫ СИНХРОНИЗАЦИИ СОВРЕМЕННОГО ТЕЛЕКОММУНИКАЦИОННОГО ОБОРУДОВАНИЯ
Authors: Сторожук Н.Л.
Published: April 2023

Изменения инфраструктуры телекоммуникационных систем, которые вызваны переходом на новые сетевые технологии, поэтапным смещением от технологий коммутации каналов к технологии коммутации пакетов (IP/MPLS/Ethernet), развитием сотовых систем связи (LTE и 5G), а также постоянно возрастающими требованиями к точности и стабильности сигналов синхронизации влекут за собой также изменения подходов к решению задач частотно-временного обеспечения. В статье рассмотрены проблемы, непременно возникающие в современных и перспективных сетях связи при передаче сигналов синхронизации, а также актуальные технологии их решения и направления ведущихся и будущих исследований.
ЦИФРОВОЙ ДВОЙНИК: ТЕХНОЛОГИЯ, РЕВОЛЮЦИОНИЗИРУЮЩАЯ МЕТОДЫ РАБОТЫ ПРЕДПРИЯТИЙ
Authors: Кубасов И.А.
Published: April 2023

В статье сформулированы преимущества предприятий, применяющих технологии цифровых двойников; разработаны рекомендации по выработке обоснованного решения о внедрении данной технологии на предприятии, включающего выбор концептуального подхода к созданию цифровых двойников. Предложен общий алгоритм создания цифрового двойника на предприятии, спрогнозированы перспективы развития и применения цифровых двойников.
БРЕНД HYPERLINE ПОПОЛНИЛСЯ БРОНИРОВАННЫМИ ОПТИЧЕСКИМИ МИКРОКАБЕЛЯМИ
Authors: Жуков В.В.
Published: April 2023

В июле 2022 года в состав ООО "Гиперлайн", российской компании-разработчика и производителя компонентов и комплексных решений для построения цифровой инфраструктуры, вошло НПП Старлинк, известное как изготовитель оптических и гибридных оптоэлектрических микрокабелей собственной запатентованной разработки. Об этом и других шагах компании в стратегическом направлении локализации и развития производства инновационного оборудования для телекоммуникаций внутри страны корреспонденту журнала "ПЕРВАЯ МИЛЯ" рассказал заместитель генерального директора НПП "Гиперлайн" В.В.Жуков
Современное состояние аналитического контроля ферросплавов
Authors: Марьина Г.Е. , Доронина М.С.
Published: April 2023

Ферросплавы являются одной из базовых составляющих в технологических процессах металлургической промышленности. Расширение номенклатуры ферросплавов, повышение требований к их качеству привели к необходимости совершенствования методов анализа этих материалов. Сложность анализа состоит в сочетании высокоточного и экспрессного определения, как легирующих элементов, так и сопутствующих компонентов и примесей. В существующих государственных стандартах на методы анализа ферросплавов регламентированы только химические и физико-­химические методы анализа: титриметрия, гравиметрия, атомно-­абсорбционная спектрометрия, спек-трофотометрия и др., которые не являются универсальными. В статье представлен обзор методической базы и современных методов анализа ферросплавов.
Записи по обращению образца в лаборатории
Authors: Лукьянчикова Н.И.
Published: April 2023

В статье рассматривается ведение технических записей по обращению образца в лаборатории. Представлены примеры форм лабораторных журналов регистрации, контроля условий окружающей среды при хранении и кондиционировании, перемещения (передачи), возврата, хранения и списания (утилизации) образцов.
Вечно молодая хроматография
Authors: Буряк А.К.
Published: April 2023

В год 120‑летия открытия хроматографии М.С. Цветом о роли хроматографии
и хромато-масс-спектрометрии в современной науке рассказывает Алексей
Константинович Буряк, член-корреспондент Российской академии
наук, доктор химических наук, директор Института физической химии
и электрохимии им. А. Н. Фрумкина РАН
Наноразмерные материалы в аналитической атомной спектрометрии
Authors: Кубракова И.В. , Пряжников Д.В. , Тютюнник О.Н. , Киселева М.С. , Ефанова О.О.
Published: April 2023

Разнообразие свойств высокодисперсных (нано) материалов обусловило перспективность их использования в неорганическом анализе, включая атомную спектрометрию (атомно-­абсорбционная спектрометрия, атомно-­эмиссионная и масс-спектрометрия с индуктивно связанной плазмой). Эти материалы применяются в качестве твердофазных экстра­гентов и матричных модификаторов, а также являются объектами анализа. В статье рассмотрены пути получения и характеризации наночастиц; приведены данные о структуре и свой­ствах магнитных наночастиц, предназначенных для решения аналитических и биоме­дицинских задач; показана возможность повышения чувствительности и селективности определения ряда элементов при использовании наночастиц в атомно-­абсорбционной спектрометрии с электротермической атомизацией и в методе холодного пара. Проанализированы новые возможности спектрометрических методов для биоаналитических приложений с участием наночастиц, включая масс-спектрометрию с индуктивно связанной плазмой в режиме единичных частиц.
Estrategia lúdica para estimular el aprendizaje en la asignatura de Biología Celular e Histología Médica
Authors: Muñoz Comonfort Armando , Rojas-Lemus Marcela , López-Valdez Nelly , Bizarro-Nevares Patricia , Fortoul Teresa Imelda
Published: April 2023

Introducción: En la licenciatura de médico cirujano se incluyen asignaturas que tienen un alto índice de no acreditación, como es el caso de Biología Celular e Histología Médica (BCeHM), en especial por la identificación de imágenes. Una manera de ayudar al estudiantado a mejorar su desempeño académico es incluir actividades lúdicas.

Objetivo: Identificar el efecto de una estrategia lúdica en el desempeño académico en esta asignatura.

Método: 520 estudiantes de 3 generaciones de 6 grupos diferentes integraron la muestra de estudio. Tres grupos recibieron el material que llamamos “pirámide” y la manera de aplicarlo. Por cada estudiante del grupo experimental se buscó otro en los grupos control con las mismas condiciones iniciales de calificación del examen diagnóstico, bachillerato de procedencia y mismo sexo. El desempeño académico se determinó por las calificaciones promedio y los porcentajes de acreditación.

Resultados: Los estudiantes a los que se les aplicó la estrategia lúdica tuvieron en promedio calificaciones más altas en los exámenes departamentales y se apreció un porcentaje mayor de acreditación comparados con el grupo control, diferencias que fueron estadísticamente significativas.

Conclusión: La estrategia lúdica ayudó a que los estudiantes tuvieran un mayor desempeño académico y un mayor índice de aprobación en la asignatura de BCeHM.
Towards a Greener Future: Sustainable Development and Green IT
Authors: AR Dinesh , Udupa Dr. Pradeep
Published: April 2023

Abstract: In latest years the green computing notion is becoming more widespread. In addition to the broad sensitivity to environmental concerns, this concern also arises from monetary desires since both energy costs and electrical requirements for the IT industry around the world exhibit an ever-increasing trend. The main purpose of this paper is to discuss the various approaches that can be taken by all the sectors of the society toestablish sustainable development and to lessen the detrimental effect of IT on nature. After going through different approaches, it can be observed that each approach focuses on different aspects of the IT field which is to be modified for greening the IT like by reducing the emission and e-waste etc. This paper talks about the contributors to the environmental damages and gives an idea on how to maintain environmental sustainability.
Analysis of Coir Composite In-filled Trench in Mitigating Ground Vibration
Authors: V Malavika , S Revathy V
Published: April 2023

Abstract: Ground vibration is a significant geo hazard that might detrimentally affect civil engineering designs and constructions. Vibrations caused by heavy vehicles, mining railway, traffic and other construction activities have become the major reason for ground vibrations. These destructive vibrations can be isolated by providing open or in filled trench barriers as it creates material discontinuity. In this study the performance of coir composite in filled trenches in mitigating ground vibration experimentally as well as numerically by using PLAXIS 2D software is carried out by varying different parameters such as geometrical parameters, source distance, load intensities etc. It was observed that the proposed trench having coir and latex components in equal proportions can efficiently isolate the ground vibrations.
BELEDİYE ÇALIŞANLARININ SPORA KATILIM MOTİVASYONLARININ İNCELENMESİ
Authors: MUTLU Tonguç Osman , ÇETİNKAYA Asil , UYSAL Uğur
Published: April 2023

Bu araştırmanın amacı belediye çalışanlarının spora katılım motivasyonlarının incelenmesidir. Araştırma betimsel ve ilişkisel tarama modeli olarak tasarlanmış olup anket tekniğinin kullanıldığı nicel bir araştırmadır. Gönüllü katılımcılardan veri toplamak adına oluşturulan anket formu 2 bölümden oluşmaktadır. Birinci bölümünde kişisel bilgiler formu, ikinci bölümde ise; Oyar ve ark. (2001) tarafından geliştirilen “Spora Katılım Güdüsü Ölçeği” (SKMÖ) kullanılmaktadır. Araştırma verilerinin analizinde SPSS istatistik analiz programı kullanılmıştır. Verilerin frekansı alındıktan sonra güvenirlik ve normallik analizi uygulanmıştır. Veriler normal dağılım gösterdiği için araştırma kişisel bilgi formu ve spora katılım motivasyonu ölçeği arasında parametrik testler uygulanmıştır. Araştırma bulgularına göre cinsiyet ve “SKMÖ” arasında yapılan bağımsız örneklemler t-test analizi sonucuna göre anlamlı farklılık tespit edilmiştir. Yaş, öğrenim durumu, spora katılım türü ve “SKMÖ” arasında yapılan tek yönlü varyans (Anova) analizi sonucuna göre anlamlı farklılık tespit edilmiştir. Sonuç olarak; erkek belediye çalışanlarının spora katılım motivasyonu kadın çalışanlara göre daha yüksek; spora katılım türü takım sporları olan belediye çalışanlarının spora katılım motivasyonu bireysel sporlar ve herhangi bir spor türüne katılım sağlamayan çalışanlara göre daha yüksektir.
Examination of the Relationship Between Exercise Addiction and Behavioral Regulations in Exercise and Substance Abuse Awareness of Weightlifting and Boxing Athletes
Authors: AKSOY Ömer Faruk , KUL Murat
Published: April 2023

The aim of this study is to evaluate the relationship between exercise addiction and behavioural regulation in exercise and substance addiction awareness of weightlifting and boxing athletes and to examine these data in terms of demographic variables. The research group consists of 333 participants. “Exercise Addiction Scale”, “Behavioural Regulations in Exercise-2” and “Substance Addiction Awareness Scale” were used for data collection. Percentage and frequency distributions and Pearson Correlation Analysis were applied in the analysis of the data. According to the results of the research, significant positive correlation was found between the Exercise Addiction Scale total score and the Substance Addiction Awareness Scale total score, and the Behavioural Regulations in Exercise-2 total score. In this context, when the motivation that occurs during exercise becomes a compulsive action, it is thought that exercise addiction starts in the individual and that the substance addiction awareness of exercise addicts is higher.
Analisis Penggunaan Smartphone dan Stres dengan Kejadian Insomnia pada Mahasiswa Kesehatan Masyarakat Universitas Jambi
Authors: Rahayu Ningsih Vinna , Rahyuni Vivit Sri
Published: April 2023

Health is a very important need for humans, one of the efforts to maintain health, such as adequate rest or sleep and stress management, poor sleep quality is called insomnia, insomnia can have a negative impact on body health, such as the risk of infectious diseases such as high blood pressure and heart disease, Several factors lead to high rates of insomnia. in students in the form of excessive smartphone use and stressful conditions. The purpose of this study was to determine the relationship between smartphone use and stress with the incidence of insomnia among public health students at Jambi University. The research method is an analytic observational study with a quantitative approach using a cross-sectional design with a sampling technique using proportional stratified random sampling as many as 8 respondents. Data analysis with chi-square test. The results of data analysis found that there is a significant relationship. between smartphone use (p = 0000) and stress (p = 0000) on insomnia in public health students at the University of Jambi. The conclusion of the study is that there is a relationship between smartphone use and stress with insomnia in public health students at the University of Jambi.
Generation Z’s Brand Love for Skincare Products: Do Religious Beliefs Matter?
Authors: Waluyo Waluyo , Qurniawati Rina Sari , Nurohman Yulfan Arif
Published: April 2023

To date, there has been no prior research examining the relationship between brand love as a determinant of brand loyalty and e-WOM specifically for halal skincare products. This study investigates how Muslim Generation Z might love a brand because of their religious beliefs and brand identity, resulting in brand loyalty and e-WOM that benefits the company. The questionnaire for this study was completed online by 120 participants from three cities in Central Java, Indonesia, namely Semarang, Salatiga, and Surakarta. The model was tested using PLS-SEM. The results of the research revealed that religious beliefs and brand identification affected brand love, whereas brand love affected brand loyalty and e-WOM. From this research, it can be seen that branding cannot be separated from faith. Muslims like brands that reflect their religious values and allow them to identify as Muslims. Therefore, marketers must have a comprehensive understanding of the halal concept in the manufacturing and production processes of halal skincare.
Climate change impact on food security: A review
Authors: Rosalia Amelia Choya Tia , Mulyaningsih Tri
Published: April 2023

Countries all over the globe are facing climate change. Global warming is a real problem that occurs and affects food production.  Precipitation and temperature rise are causes of the changes observed in this study. This study examines the relationship between food security level due to climate change. To provide further clarity, a systematic literature review (SLR) towards the impacts of climate change was conducted to identify the extent of its impacts on food security and to identify the extent of its impacts on the level of food security and research gaps. This systematic review identifies and analyzes documents on the impact of climate change on the level of food security in terms of the impact of climate change, the methods used to analyze climate change, and the available climate change adaptation policies. Following SLR guidelines, Google Scholar is the main database. This research can broaden our knowledge about the impacts of climate change and the role we can play in maintaining food security.
Spatial model of industrial area suitability using spatial multi criteria evaluation: A case study in Kendari City
Authors: Septian Septianto Aldiansyah , Saputra Randi Adrian
Published: April 2023

Designing an industrial location must be based on consideration of factors that will influence it such as natural, environmental and ecological conditions. One of the spatial-based location determination methods is Spatial Multi-Criteria Evaluation (SMCE). This study aims to determine suitable industrial areas and compare industrial locations that have been determined based on the Regional Spatial Plan (RTRW) for 2010-2030 in Kendari City. Industrial areas must be flood-free, located in a relatively flat area, far from settlements, have good access and must not interfere with the river’s natural function. Therefore, the aspects of access, hydrology, physiography and convenience were all taken into account in this study. The area in Scenario A was retested with Scenario B and Scenario C to get a variety of industrial areas with different perspectives. Kendari City’s appropriate industrial area is 2.462.36 ha and is located in Puuwatu Sub-District, which is directly connected to Mandonga Sub-District (scenario 2.C). The RTRW map with the industrial model of the area shows the mismatch of the proposed industrial area placement. The results of this industrial area can be used as an alternative for decision-makers.
Continuous conveying and mixing characteristics of high viscosity materials under acoustic vibration excitation
Authors: Zhan Xiaobin , Ye Binhuan , Li Biran , Shi Tielin
Published: April 2023

Investigating the conveying and mixing characteristics of high-viscosity
fluids in an inclined flow channel under the excitation of acoustic
frequency vibrations using computational fluid dynamics (CFD) methods.
As the intensity of the acoustic vibration excitation increases, the
free surface of the liquid transitions from generating Faraday waves to
generating disordered jets. Continued increase in the amplitude leads to
the liquid filling most of the vessel space, causing a blockage.
However, slowly increasing the amplitude alleviates the blockage
phenomenon. When high-viscosity materials are subjected to
high-intensity acoustic vibration, the flow field is dominated by shear
flow, which is accompanied by efficient stretching and folding. Changing
the amplitude or frequency alone can cause blockage, and increasing the
frequency of vibration excitation alone will not alleviate the blockage.
Instead, increasing the amplitude can generate more mixing-promoting
reflux, effectively relieving blockage while maintaining stable
conveying capacity.
Method for estimating the future annual mass of decommissioned wind turbine blade material in Denmark
Authors: Abrahamsen Asger Bech , Beauson Justine , Lund Kristine Wilhelm , Madsen Erik Skov , Rudolph David Philipp , Jensen Jonas Pagh
Published: April 2023

A model of the evolution of the onshore wind turbine blade mass
installed in Denmark is proposed described by a Weibull distribution and
the age of the blades is estimated from decommissioning data to
t = 29 years when half of the blade mass of
an installation year has been decommissioned. This is considerable
longer than the 20 year design life time of onshore turbines, which is
often assumed to be an estimate of the End-of-Life of turbine blades.
Thus blade waste predictions using the simple assumption may predict
that installed blade masses are entering recycling processes about 9
years sooner that what is observed in Denmark. The blade mass for
decommissioning in Denmark is estimate to peak at 2000 ton/year and 5000
ton/year in 2028 and 2045 using the Weibull model.
Benchmarking Hydrological Models for an Uncertain Future
Authors: Beven Keith
Published: April 2023

This commentary discusses a framework for the benchmarking of
hydrological models for different purposes when the datasets for
different catchments might involve epistemic uncertainties. The approach
might be expected to result in an ensemble of models that might be used
in prediction (including models of different types) but also provides
for model rejection to be the start of a learning process to improve
understanding.
RECURRENT THORACIC AIR LEAK SYNDROME IN PATIENTS AFFECTED BY PULMONARY GRAFT-VERSUS-HOST DISEASE: SURGICAL STRATEGIES AND OUTCOME
Authors: PERSANO Giorgio , CROCOLI Alessandro , MARTUCCI Cristina , Pardi Valerio , PAOLO Pier Luigi DI , Petreschi Francesca , CAFIERO Giulia , Inserra Alessandro
Published: April 2023

Background and aims Thoracic air leak syndrome (TALS) is a
complication related to chronic pulmonary graft-versus-host disease
(pGvHD) that affects approximately 0.83% to 3.08% patients after
allogenic hematopoietic stem cell transplant. Such complication is
defined as the occurrence of any form of air leak in the thorax,
including spontaneous pneumomediastinum or pneumopericardium,
subcutaneous emphysema, interstitial emphysema and pneumothorax and has
a negative impact on post-transplant survival. The aim of the present
study is to describe a single-center experience in the surgical
management of recurrent TALS in adolescents and young adults and its
outcome. Methods We retrospectively reviewed the clinical notes
of patients with previous allogenic hematopoietic stem cell transplant
who underwent surgical procedures for recurrent TALS from January 2016
until March 2021. As well we analyzed clinical data, number of episodes
of thoracic air leak, surgical procedures and relative outcome.
Results In the examined period, four patients, aged 16 to 25
years, underwent surgical procedures for TALS, including thoracostomy
tube placement, thoracoscopic pleurodesis and thoracotomy. All the
patients had been diagnosed with pGvHD before the onset of TALS, with a
mean time lapse of 276 days (range 42 – 513). These patients
experienced on average 4.5 air leak episodes (range 3 – 6). All the
patients experienced at least two episodes before surgery. One patient
underwent emergency tube thoracostomy only, three patients underwent
thoracoscopic pleurodesis and two patients underwent thoracotomy. After
surgery, patients were free from air leak symptoms for a mean time of
176 days (range 25 – 477). Pulmonary function progressively
deteriorated, and all the patients eventually died because of
respiratory failure after a mean time of 483 days (range 127 – 1045)
after the first episode of air leak. Conclusions Surgery
provides temporary relief to symptoms related to TALS. When TALS
develops, pulmonary function progressively worsens toward respiratory
failure and death.
A strategy of artificial intelligence with chemical fingerprinting to predict drug phase behaviors in complex systems.
Authors: Wang Siqi , Ji Yuanhui
Published: April 2023

With the large-scale development of drugs, understanding the drug phase
behaviors in complex systems become increasingly important. Among them,
the solubility of drugs in biorelevant media needs to be urgently
understood. To address this challenge, new strategies based on machine
learning models are proposed. First, the strategy trains five machine
learning models based on fifteen molecular descriptors of the drug
molecular properties. The XGboost model was identified as the best
predictive model for predicting drug solubility performance in various
solvents. Next, the input feature vectors were expanded for machine
learning using the MACCS chemical fingerprint coupled with the XGboost
model. The MACCS chemical fingerprint coupled with the XGboost model has
significantly improved the prediction accuracy of drug solubility. This
finding demonstrates that the proposed strategy has solubility
prediction capability, which is expected to provide valid information
for drug development and drug solvent screening.
Effect of symmetrical perforation on mixing performance of perforated Kenics static mixer
Authors: Tang Yang , Wang Jie , Zhou Minghai , Li Guangyao , Xiao Xiao
Published: April 2023

In order to improve the mixing effect of the traditional Kenics static
mixer, a new type of static mixer with a perforated structure added to
the spiral insertion band of the existing mixer is proposed. The results
show that the perforated structure can change the flow state of the
fluid, and accelerate the flow in the perforated area, thus improving
the mixing performance of the mixer. With the increase of the
perforation diameter, the mixing performance of the mixer is gradually
enhanced. However, when the perforation diameter continues to increase,
the spiral channel inside the mixer is destroyed, and the mixing effect
is weakened. Only changing the perforation spacing has no obvious effect
on the mixing effect. For the same mixer length, the reduction of the
length-diameter ratio of mixing unit leads to the increase of the number
of mixing units, the better mixing effect of the mixer.
An experimental study on combustion and emissions characteristics in a dual-injection spark-assisted compression ignition engine fueled with PODE/gasoline
Authors: Zhao Tingyu , Xia Chun , Fang Junhua , Zhu Lei , Huang Zhen
Published: April 2023

Spark-assisted compression ignition (SACI) is a potential way to improve thermal efficiency for gasoline engine with a relatively low compression ratio. The dual-injection system and spark strategy are considered to be an effective approach to control the combustion of SACI engine. Polyoxymethylene dimethyl ethers (PODE) is a potential fuel for carbon neutral with high oxygen content and unique molecule structure. In this study, the transition of combustion modes with different equivalence ratio and effects of direct injection ratio on SACI combustion and emissions fueled with PODE/gasoline under different loads were investigated. The results showed that SACI combustion could be achieved with the compression ratio of 13 and the brake thermal efficiencies at 2 bar, 3 bar, and 4 bar under the dual-fuel SACI were increased by 49%, 29%, and 27%, respectively, compared with the gasoline spark ignition mode. The increase in direct injection ratio first shortened the combustion duration and then prolonged. An appropriate direct injection ratio was shown to control the combustion process to achieve high efficiency combustion, at which low total HC, CO, and PM emissions were achieved while the NOx emissions remained at a low level.
Numerical simulation of the gas flow through the rectangular channel with perforated plate
Authors: Markovic Zoran , Eric Milic , Jovanovic Rastko , Lazovic Ivan
Published: April 2023

The perforated plates are commonly used for gas flow control in the wide-angle diffusers of electrostatic precipitators of large power plants. Many studies dealt with the investigation of the effects of the perforated plate?s geometry on flow parameters in the cases where incoming flow is perpendicular to the plate and the plate is covering the whole cross-section of the flowing channel. These results are partially applicable in cases where flow is inclined on the plate or when the plate is not occupying the whole cross-section of the channel. The subject of this work is a numerical investigation of flow through the rectangular channel with a perforated plate in various positions in the cross-section of the channel. The aim was to investigate the effect of the plate position on the flow. The perforated plates were modeled as thin porous media of finite thickness by using the directional loss model. Numerical experiments are carried out by using CFD software ANSYS CFX. Results of pressure drop and velocity distribution behind the plate are compared to the results of CFD simulation of the full 3-D plate model. In order to obtain a reasonable agreement both of the pressure drop and velocity distribution behind the plate when using a simplified thin porous plate model, the value of streamwise permeability of the plate had to be adjusted. The level of adjustments has determined iteratively and it depends on the plate position in the channel?s cross-section.
Numerical simulation and optimization of steel tube billet heating process in rotary hearth furnace using computational fluid dynamics
Authors: Yang Likun , Su Fuyong , Wen Zhi , Tao Shuming , Bai Guangjie , Luan Chunmei
Published: April 2023

Billet reheating is an important part of the steel production process. Since the production process will adopt different tube billet arrangement strategies, and the condition of the furnace hearth will also change due to long-term operation and accumulation of iron oxide scales, these factors will inevitably affect heating efficiency and temperature distribution uniformity of the tube billet, thereby affecting the quality of the final product. In this study, a physical and mathematical model was established for a 48 m diameter rotary hearth furnace of the seamless steel pipe production-line and typical 300 mm diameter tube billets of different lengths. Commercial FLUENT code was used to carry out CFD numerical simulation research on the influence of the aforementioned factors. Optimizing and adjusting strategies under different arrangement strategies were proposed, and the influence of furnace hearth condition change on heating effect was studied. The methods and simulation approach of this paper also have guidance for the billet heating control in similar continuous heating furnaces.
Thermal modeling and analysis of 3-D integrated circuits with irregular structure
Authors: Rao Xixin , Liu Huizhong , Wang Sai , Song Jianhao , Jin Cheng , Xiao Chengdi
Published: April 2023

Considering the manufacturing and packaging process, 3-D integrated circuits design often requires irregular chip structures. The 3-D integrated circuits with irregular structures can facilitate differentiated chip design and reduce manufac?turing costs. Highly complex through-silicon vias have not been considered in past thermal modelling and analysis of irregularly structured 3-D integrated circuits. Thus, a detailed model of a three-layer irregularly structured 3-D integrated circuit with through-silicon vias and microbumps is developed, and an analytical method based on the thermal resistance network model is proposed to extract the equiv?alent thermal conductivity of through-silicon vias and microbumps, the accuracy of which is verified by a 3-D finite element simulation method. The results show that the maximum temperature and temperature gradient obtained by the equivalent model simulations agree well with the detailed model results, proving the validity of the equivalent model. To save the computational cost, the effects of heat source area, power setting and through-silicon vias structure parameters on the maximum temperature are studied by numerical simulation method based on the equivalent model. Heat source area equal to the overlap between chip layers, high power chips close to the heat sink, and reducing through-silicon vias pitch can better reduce the maximum temperature. The results provide a reference value for thermal design and optimization of 3-D integrated circuits with irregular structures.
A new method of parameter identification for proton exchange membrane fuel cell based on hybrid particle swarm optimization with differential evolution algorithm
Authors: Liu Dong , Yang Xiangguo , Guan Cong , Qi Tianxi , Zheng Qinggen
Published: April 2023

With the characteristics of high energy conversion efficiency, high energy den?sity and low operating temperature, the proton exchange membrane fuel cells (PEMFC) have become one of the green energy sources with broad prospects. The establishment of accurate mathematical model of the PEMFC is the basis of simulation and control strategy. At present, some intelligent algorithms have certain drawbacks, and can hardly find the balanced point between precision and computational time. In this study, a novel parameter identification approach com?bining the hybrid particle swarm optimization (PSO) algorithm with differential evolution, i.e. hybrid DEPSO, is proposed to obtain the unknown parameters in the PEMFC mathematical model and solve the problems of premature convergence of PSO and poor global search ability of differential evolution. Six benchmark functions are applied to verify the performance of the algorithm. The results prove that the hybrid DEPSO can evade local optimum preferably while having swifter convergence rate. Two PEMFC stacks are investigated and modeled. In order to evaluate the accuracy of model, the sum of squared errors between the measured voltage and the estimated output voltage are examined. Numerical results show higher accuracy of the hybrid DEPSO-based model comparing with other recently published optimization approaches. Furthermore, the simulation results indicate that the accuracy of the PEMFC model optimized by the hybrid DEPSO algorithm improves 0.19-1.86%, which can provide a new solution the multi-objective opti?mization problem and promote the practical application of the PEMFC.
Experiment and simulation studies on thermal performance of a novel water-cooling premixed wall-hung gas boiler
Authors: Wang Ning , Deng Shifeng , Wang Zongyi , Gui Yong , Le Ming , Zhao Qinxin , Shao Huaishuang
Published: April 2023

A wall-hung gas boiler was innovatively proposed and designed in this paper. Water-cooling premixed combustion and enhanced condensation heat exchange technology were adopted in the boiler. The extruded aluminum plate-fin structure was adopted in the burner and condensing heat exchanger. Experiment and numerical simulation studies were conducted on the flow, combustion, and heat exchange characteristics of the boiler. The effect of the fin structure, excess air coefficient, heat load, and water-cooling temperature on the thermal performance of the boiler was analyzed. The results showed that reliable ignition, stable combustion, uniform flame distribution, and low pollutant emissions can be achieved in the wall-hung gas boiler. Affected by burning intensity and internal flue gas re-circulation, when the burner plate-fin gap was 1.63 mm, the flame was the shortest and the NOx emissions were the lowest. Under this fin condition, ultra-high efficiency and ultra-low emissions can be achieved in the boiler with a low excess air coefficient. When the excess air coefficient was 1.3, the NOx emissions were less than 30 mg/m3 at the heat load of 4-14 kW, and the thermal efficiency can reach up to 102.8% at the rated load of 14 kW. Within the scope of the experiment, the NOx emissions changed little with the water-cooling temperature. At the temperature of 333 K, there was still a great NOx emission reduction effect.
Experimental and numerical investigation of driving potential of biomass-pellet hot air generator for coupling with absorption heat pump
Authors: Ilic Marko , Stefanovic Velimir , Brega Dmytro , Zivkovic Dragoljub , Pavlovic Sasa
Published: April 2023

This paper presents a numerical and experimental study of a heating system that consists of hot air generator driven by biomass pellet burner to drive the NH3-water absorption heat pump made by Robur. The aim of this work is to fully test the system of hot air generator for thermal potential, by developing a thermal field, while driving the absorption heat pump of medium capacities for residential purposes, and to make model of predicting the efficiencies of heating comparing to conveyed heat in desorber of absorption heat pump. Numerical simulations of the hot air generator were performed in the commercial software ANSYS FLUENT and CFX. The experimental part was carried out in the laboratory of the Faculty of Mechanical Engineering in Nis, where the temperature and velocity measurements were obtained and compared to numerical results. Results were obtained for mass air-flow through the hot air generator and desorber of 0.17 and 0.2552 kg/s, pellet burner power of 15 kW, 18 kW, 21 kW, 24 kW, 27 kW, and 30 kW, with air inlet temperature in desorber of around 89-140?C. The heating efficiency of the absorption heat pump goes from 1.01 to 1.37. The heat loss over the surfaces of hot air generator goes from 0.6-0.9 kW depending on ambient air and surface temperatures. The system has the potential to be applied in low temperature heating and the spare heat from combustion products and residual hot air can be used for different purposes.
Direct numerical simulation of double diffusive natural convection in a closed mixture cavity heated from below
Authors: Xia Yaowen , Chen Juan
Published: April 2023

Double diffusive natural convection is one of the most widely used study subjects in heat and mass transfer. In this present study, double diffusive natural convection heating from below the wall in a closed cavity was studied with direct numerical simulation method. The flow characteristics are presented as isotherms, iso concentrations, and streamlines. The results show that RaT has signification strong effects on average Nusselt number, with a more considerable RaT, the value of Nusselt number more higher. These were also found to increase with increasing buoyancy ratio for adding flow and decrease as buoyancy ratio decreases for opposing flows
Numerical study on aerodynamic performance and particle erosion characteristics of flue gas turbine
Authors: Cai Liuxi , Yao Jiawei , Hou Yanfang , Li Yun , Wang Shunsen , Mao Jingru
Published: April 2023

The 3-D numerical simulation method is coupled with erosion and particle rebound models based on the results of high temperature erosion tests to systematically study the gas-solid two-phase flow characteristics of a flue gas turbine for the first time. The aerodynamic loss characteristics of the flue gas-steam mixtures and particle erosion mechanism in the flue gas turbine cascade under design and non-design conditions are investigated. The results indicate that the mixing loss of cooling steam and gas, secondary flow loss, and separation loss significantly affect the entropy increment of the rotor cascade. The isentropic efficiency of the flue gas turbine under the design condition is 78.74%. The radial inflow of wheel cooling steam from the axial clearance has a radial impact and mixing effect on the mainstream flue gas, enhancing the generation and development of the secondary flow vortex in the rotor cascade. When the dimensionless cooling steam flow rate is reduced from 1 to 0.6, the isentropic efficiency of the flue gas turbine increases by approximately 0.9%. By contrast, when the dimensionless cooling steam flow rate increases from 1 to 2, the isentropic efficiency decreases by 0.42%. The erosion rate of the leading and trailing edges of the rotor is higher than those at other streamwise locations. The erosion of the rotor leading edge and the blade-tip trailing edge is caused by the high speed impact of particles above 10 ?m, while the erosion of the rotor root is caused by the grinding of 1-5 ?m particles carried by the secondary flow.
Design of efficient thermophotovoltaic system based on meta-material narrow-band emitter for space power supply
Authors: Li Heng , Tian Jialu , Sun Shujian , Shan Shiquan
Published: April 2023

Photovoltaic technology has been widely used in spacecraft power supply, but its efficiency is difficult to be greatly improved by Shockley-Queisser limitation. The thermophotovoltaic technology can convert solar radiation energy or high temperature combustion energy into radiation energy with reshaped spectrum for direct photovoltaic power generation. In this study, a meta-material structure composed of metal tantalum, Ta, and dielectric SiO2 is innovatively proposed for shaping narrowband radiation. The results show that the optimized spectral emittance peak of narrowband emitters reaches 0.9998. Narrowband emitter has advantages at high temperatures above 1000 K. The thermophotovoltaic efficiency of InGaAsSb cell and tandem Si/InGaAsSb cells can reach more than 41.67% and 46.26%, respectively. It is significantly higher than published thermophotovoltaic system with broadband emitter. This study demonstrates the notable advantages and potential of narrowband emitter for spectrum reshaping, which provides an important reference for future spacecraft power supply as well as space solar power generation.
Study of hydrogel materials thermophysical properties
Authors: Pokusaev Boris , Zakharov Nikolay , Vyazmin Andrey , Nekrasov Dmitry , Volkova Elena , Moshin Andrey
Published: April 2023

Based on the optical holography method, heating studies of the wall area in various hydrogels have been carried out applied to 3-D bioprinting technologies. For quantitative measurement of temperature fields, the method of optical holography was used in combination with the method of gradient thermometry, based on the refractive index dependence on the properties of hydrogel systems of different concentrations and temperatures. Under the conditions of the thermophysical properties changes of hydrogels, as well as the magnitude of the supplied heat flow, the heating features are studied in order to determine the coefficients of thermal conductivity and heat capacity, as well as the thermal conditions for the occurrence of convective flows near the wall heated from below in such systems.
Nanofluids (CuO & TiO2) - water as heat transfer fluid in a thermal energy storage system for applications of solar heating: An experimental study
Authors: Kondakrindi Krishna , Reddigari Meenakshi , Konireddy Hemachandra , Maheswari Uma
Published: April 2023

The present work aims to exploit the thermal performance of a packed bed of combined sensible and latent heat of storage unit with an integrated solar heat source. A cylindrical insulated storage tank in the thermal energy storage (TES) unit is filled with spherical capsules separately which contains PCM as paraffin wax and stearic acid. The PCM usage has the benefits that it can be used as a thermal management tool and it reduces the cost and size of the system as it offers higher isothermal behavior and thermal storage capacity. The thermal conductivity of heat transfer fluid (HTF) can be enhanced by using nanoparticles mixed in water. Nanofluids are the more efficient fluids for the applications of heat-transfer. The water based nanofluids are used to transfer heat between the solar collector and storage tank which is a sensible heat storage material. The HTF materials are varied and experimental trials have been conducted separately. Experimentation was carried out first by considering only water as HTF and is extended by adding water with one of the nanomaterials i.e. The TiO2 and CuO, each in 3 HTF vol.% as 0.2, 0.5, and 0.8. The variable source of heat supply considered is solar flat plate collector. The study was transpired by varying the flow-rates of nanofluids as 2.0, 4.0, and 6.0 Lpm. The novelty of this work is to envisage the enhancement of heat transfer and to study the effects on the melting time of the PCM of these fluids which were carried out. The performance parameters like charging time and system efficiency, instantaneous stored heat, cumulative stored heat were studied for the different HTF and for the PCM-paraffin and stearic acid. The batch wise process experiments for discharging were carried out to recover the heat stored, and the results are presented.