bluuebunny/crossref_metadata_2025 huggingface dataset:
Use of cold waters geochemistry as a geothermal prospecting tool for hidden hydrothermal systems in Réunion Island
Authors: Bénard Bhavani , Famin Vincent , Agrinier Pierre , Louvat Pascale , Lebeau Geneviève , Burckel Pierre
Published: January 2024

Most untapped high-enthalpy geothermal resources are blind, meaning lacking surface evidence of their existence. The first step in their discovery is to find evidence of hydrothermal activity. Here we apply an approach based on the geochemistry of cold waters, which allowed us to identify evidence of the existence of a hydrothermal system at Piton de la Fournaise volcano (Réunion Island), and constrain its location. This approach uses the concentrations in B, Li, SO4, F, Mo, P, V, As and HCO3 and the isotopic ratios δ13C and δ11B as geochemical markers of hydrothermal activity that can be used even in waters with extremely low ion content (Electrical conductivity <80 µS/cm), and even when their geochemical composition is mainly controlled by other processes. This noninvasive approach is easy to implement and can be applied wherever the presence of a blind geothermal system is suspected.
Results and lessons learnt from the WISTERIA phase I trial combining AZD1775 with cisplatin pre- or post-operatively in head and neck cancer
Authors: Kong Anthony , Kirkham Amanda J. , Savage Joshua S. , Mant Rhys , Lax Siân , Good James , Forster Martin D. , Sacco Joseph J. , Schipani Stephano , Harrington Kevin J. , Yap Christina , Mehanna Hisham
Published: January 2024

Background

Pre-clinical studies suggest AZD1775, a WEE1 kinase inhibitor, potentiates the activity of various chemotherapeutic agents.

Methods

WISTERIA was a prospective, parallel two-group, open-label, dose-finding, phase I clinical trial. Eligible patients had histologically confirmed oral, laryngeal, or hypopharyngeal squamous cell carcinoma, ECOG performance status 0/1, and aged ≥18-to-≤70 years. Primary outcomes were adverse events and defining recommended dose and schedule of AZD1775 in combination with cisplatin in pre-operative (Group A), or with cisplatin/radiotherapy in post-operative (Group B) patients. Dose determination was guided by a modified time-to-event continual reassessment method (mTITE-CRM).

Results

Between 30-Oct-2017 and 15-Jul-2019, nine patients were registered: Three into Group A and six into Group B. WISTERIA was closed early due to poor recruitment. Five dose-limiting toxicities (DLTs) were reported in four Group B patients. Seven serious adverse events were reported in four patients: One in Group A, and three in Group B. Three were related to treatment. No treatment-related deaths were reported.

Conclusions

WISTERIA did not complete its primary objectives due to poor recruitment and toxicities reported in Group B. However, use of the novel mTITE-CRM improved flexibility in reducing accrual suspension periods and should be considered for future trials in complex patient populations.

Clinical Trial Registration

ISRCTN76291951
Constructing ultra-stable and high-performance zinc-ion batteries through Mn doped vanadium oxide nanobelt cathode
Authors: Wang Tiantian , Yuan Yapeng , Chang Mengwei , Zhang Yue , You Junhua , Hu Fang
Published: January 2024

In this study, analysis of density functional theory calculations shows that the Mn2+ doping between VO6 layers functions as a “structural pillar,” and Mn2+ in the layer can boost the conductivity of VO2·0.2H2O and hold high specific capacity.
A density functional theory study on the mechanism of toluene from dimethylcyclopentane catalyzed by the [GaH]2+ active site of Ga-ZSM-5
Authors: Liu Hongyan , Sun Furong , Xu Junzhuo , Zhang Hairong , Wu Tingting , Han Shenghua , Zhang Shijun , Mo Yan , Ling Lixia , Zhang Riguang , Fan Maohong , Wang Baojun
Published: January 2024

Our theoretical calculations confirm that the selectivity of toluene is higher than that of benzene in the MTA process.
Sulfated lignocellulose nanofibril supported flower-like BiOBr with oxygen vacancies towards absorption–photocatalytic synergetic removal of organic pollutants
Authors: Zhou Xin , Liu Yanming , Liu Xiuyu , Xu Mengxing , Shi Ji , Huang Qin
Published: January 2024

Flower-like BiOBr/SLCNF composites with oxygen vacancies were prepared by in situ synthesis method using sulfated lignocellulose nanofibrils as a carrier.
Promoting the four electrocatalytic reactions of OER/ORR/HER/MOR using a multi-component metal sulfide heterostructure for zinc-air batteries and water-splitting
Authors: Dang Jiaxin , Chen Genman , Yuan Bingen , Liu Fuyue , Wang Qin , Wang Fu , Miao He , Yuan Jinliang
Published: January 2024

Multi-component metal sulfide heterostructures are promising for multi-functional catalytic activities.
Preparation and performance testing of novel bendable optically transparent fluorinated hyperbranched linear long chain segment poly(amide-imide) films
Authors: Sun Ze-Bang , Yang Wen , Zhang Xiao-Sa , Zhu Xiao-Yu , Luan Jian , Li Wen-Ze , Liu Yu
Published: January 2024

A series of fluorinated hyperbranched linear long-chain segment poly(amide-imide)s were prepared. Subsequently, a detailed comparative study of the optical properties of the hyperbranched PAI films with those of commercial films was carried out.
A solid-state electrolyte for electrochemical lithium–sulfur cells
Authors: Huang Yi-Chen , Ye Bo-Xian , Chung Sheng-Heng
Published: January 2024

A lithium lanthanum titanate (LLTO) solid-state electrolyte is adopted in a lithium–sulfur cell to stabilize the passivated lithium anode and to demonstrate the optimized electrochemical interface between the LLTO and polysulfide cathode.
Discovery and heterologous biosynthesis of glycosylated polyketide luteodienoside A reveals unprecedented glucinol-mediated product offloading by a fungal carnitine O-acyltransferase domain
Authors: Arishi Amr A. , Shang Zhuo , Lacey Ernest , Crombie Andrew , Vuong Daniel , Li Hang , Bracegirdle Joe , Turner Peter , Lewis William , Flematti Gavin R. , Piggott Andrew M. , Chooi Yit-Heng
Published: January 2024

Luteodienoside A – a glycosylated polyketide produced by the Australian fungus Aspergillus luteorubrus is biosynthesised by a polyketide synthase with a carnitine O-acyltransferase domain capable of adding glucinol to the polyketide product.
Subcellular protein turnover in human neural progenitor cells revealed by correlative electron microscopy and nanoscale secondary ion mass spectrometry imaging
Authors: Lork Alicia A. , Rabasco Stefania , Ernst Carl , du Toit André , Rizzoli Silvio O. , Phan Nhu T. N.
Published: January 2024

Protein turnover is a critical process for accurate cellular function, in which damaged proteins in the cells are gradually replaced with newly synthesized ones.
A fluorescent sp2c-covalent organic polymer with an aggregation-induced emission unit to suppress aggregation-induced quenching for sensing furazolidone
Authors: Wang Xinyi , Kuang Lijuan , Ye Meiling , Zou Liangmei , Wang Li , Song Yonghai
Published: January 2024

Furazolidone (FZD) is a nitrofuran antibiotic that has an inhibitory effect on a variety of Gram-negative and positive bacteria.
Viscoelastic dynamics of a soft strip subject to a large deformation
Authors: Delory Alexandre , Kiefer Daniel A. , Lanoy Maxime , Eddi Antonin , Prada Claire , Lemoult Fabrice
Published: January 2024

We follow the propagation of guided elastic waves in a soft strip and study the effect of frequency and prestress on their velocities. The two fundamental in-plane modes are displayed: compression and flexion.
Deciphering the role of Fe impurities in the electrolyte boosting the OER activity of LaNiO3
Authors: Cheraparambil Haritha , Vega-Paredes Miquel , Wang Yue , Tüysüz Harun , Scheu Christina , Weidenthaler Claudia
Published: January 2024

Functional links have been established at the atomic and local scales to understand the synergy between the Fe impurities in the electrolyte and active Ni centres in LaNiO3 perovskite systems.
Some variations of Tanner's construction for short length QC‐LDPC codes
Authors: Kim Wonjun , Cho Hyunwoo , Song Hong‐Yeop , Song Min Kyu
Published: January 2024

This paper proposes a modification to Tanner's work for constructing girth‐8 quasi‐cyclic low‐density parity‐check codes. The main contribution of this paper is to use an arithmetic sequence at the leftmost column for the exponent matrix so that the lifting size is not necessarily restricted to the prime numbers. Two theorems on the lifting sizes that achieve girth at least 8 using this approach is also provided. This construction exhibits better frame error rate results to the modified 5G new radio (NR) low‐density parity‐check codes for lengths around 500. Also, this construction achieves better frame error rate performance results than the recently proposed one using the Golomb rulers at around frame error rate of 10−6.
Kernel‐PCA‐based single‐phase earth fault detection model using multilayer perceptron in deep learning
Authors: Su Xueneng , Zhang Hua , Zhang Jian , Long Cheng , Li Xiaopeng , Gao Yiwen , Li Shilong
Published: January 2024

The rapid and accurate identification of single‐phase earth fault is of prime concern for many scholars from industry and academia, because its fault characteristics are extremely weak while the related potential hazard is extremely severe. In this context, this paper borrows from Deep Learning and in turn innovatively puts forward a multilayer perceptron (MLP)‐based single‐phase earth fault detection model augmented with kernel principal component analysis (KPCA). First, KPCA is applied to building fault feature extraction engineering via the transformation of fault features from low‐dimensional linear indivisible space to high‐dimensional one. Second, a MLP‐based model is used for basic model reference where many optimization strategies together with dropout technique are introduced and custom‐designed in tuning this model to achieve the best detection accuracy and convergence characteristic. Numerical studies demonstrate the superiority of the proposed KPCA‐MLP‐based single‐phase earth fault detection model.
Development Effects of Hydrophonic Systems DFT Contacting Green Brassica (Brassica Juncea L.) With Addition of Eggs
Authors: Anisya Shinta , Ramadani Fitria , Prasetya Winandari Ovi
Published: January 2024

A lot of people like eggs. Eating more eggs produces more egg shells. This study aims to determine how the yield of eggshell waste affects the growth of green sage (Brassica juncea L.) in a hydroponic system that uses the dynamics of growth factors. (DFT). The research site is a hydroponic farm managed by the Food Resilience Department of Kalianda District of Lampung South in April 2023. The total sample is 30 using Simple Random Sampling. This research is quantitative research with the kind of experimental research. Method used Complete Random Planning (RAL) with 5 treatments and 6 repetitions. Anova’s one-way analysis with SPSS 25 and Duncan’s further tests at the 5% level are used to analyze the data obtained. The results of the study showed that the P4 treatment, consisting of 300 milliliters of egg shell POC and 30,000 millilitres of water, had the best results compared to the treatment of the addition of other egg shells POC.
Soil Chemical Status Under Natural Forest, Coffee Agroforestry and Coffee Monoculture at Air Hitam Subdistrict, West Lampung, Indonesia
Authors: Ramadhani Winih Sekaringtyas , Rahmat Ali , Mutolib Abdul , Rahman Nanik Astuti , Sutrisno Eko , Amilia Euis , Indriyani Indriyani
Published: January 2024

The chemical status of soil is a crucial aspect of soil health and plays a vital role in determining plant growth and productivity. However, the change in land use from forest to coffee plantation can influence the soil’s chemical condition. One strategy to improve soil condition is agroforestry. Despite the growing interest in coffee agroforestry systems as a sustainable alternative to coffee monoculture, there is limited research on their effects on soil chemical status in Indonesia. Air Hitam Subdistrict in West Lampung, Indonesia, is an important coffee-growing region where both agroforestry and coffee monoculture systems are practiced. This study aims to compare the soil chemical status of natural forest, coffee agroforestry, and coffee monoculture systems in Air Hitam Subdistrict. It particularly focuses on key macronutrients such as nitrogen, phosphorus, and potassium, as well as secondary macronutrients like calcium and magnesium, and trace elements such as sodium. The results show that soil organic carbon (SOC), N-Total, K, Ca, and Mg concentrations are higher in the natural forest than in coffee agroforestry, and higher in coffee agroforestry compared to coffee monoculture. However, the available phosphorus (P) concentration is higher in coffee monoculture due to the application of chemical fertilizers. This research reveals that coffee agroforestry can improve soil condition.
WECNN-PDP: Weighted Ensemble Convolutional Neural Networks Models to Improve the Plant Disease Prediction
Authors: Sutiaji Deni , Yildiz Oktay , Rosyid Harunur , Chotijah Umi
Published: January 2024

As an agricultural country, Indonesia’s agricultural production is essential. However, crop failure will occur if diseases and other factors, such as natural disasters, attack many plant fields. These problems can be minimized by early detection of plant diseases. However, detection will be challenging if done conventionally. Prior research has shown that deep learning algorithms can perform detection with promising results. In this study, we propose a new weighted deep learning ensemble method as a solution for better performance in plant disease detection. We ensemble the model by considering the combination of two and three pre-trained convolutional neural networks (CNNs). Initially, we perform transfer learning on individual CNN models by prioritizing high-dimensional features through weight updates on the last few layers. Finally, we ensemble the models by finding the best weights for each model using grid search. Experimental results on the Plant Village dataset indicate that our model has improved the classification of 38 plant diseases. Based on metrics, the three-model ensemble performed better than the two-model ensemble. The best accuracy results of the ensemble MobileNetV2-DenseNet121 and MobileNetV2-Xception-DenseNet121 models are 99.49% and 99.56%, respectively. In addition, these models are also better than the state-of-the-art models and previous feature fusion techniques we proposed in LEMOXINET. Based on these results, the ensemble technique improved the detection performance, and it is expected to be applied to real-world conditions and can be a reference to be developed further in future research.
An Analysis of Disaster Preparedness and Mitigation in Ammonia Loading Systems
Authors: Ratriwardhani Ratna Ayu , Sahri Moch. , Sunaryo Merry
Published: January 2024

PT. X has several products produced for distributors and consumers. One of the products produced is a liquid chemical product, namely ammonia which is distributed via tank trucks or containers. If the ammonia gas reaches a volume of 16-17% and flies freely in the air, an explosion may occur which will become a source of fire for the ammonia spray that comes out at high pressure. From the hazard description, it proves that the process of filling and transporting ammonia through tank trucks has many risks that can cause work accidents for workers in the loading and transporting sector of ammonia. The specific aim of this research is to determine the company’s level of preparedness in dealing with disaster failure of the ammonia loading system on tank trucks or containers and determine mitigation steps. To assess the level of disaster preparedness or readiness assessment, this research uses a checklist. The standard used in making this checklist is CAR (Capability Assessment of Readiness) Emergency Management Function. After all the checklist data is obtained, a validity test and reliability test will be carried out. The results of the readiness assessment showed that the emergency preparedness level was 47% fully capable and 53% very capable. Mitigation preparation is proposed based on the results of the readiness assessment. The non-structural mitigation provided is that management should not only provide a regular schedule for worker training, but management must also pay attention to the material that will be delivered at the training; management is advised to make a regular schedule to provide emergency response system training to the community around PT. X; provision of safety equipment during an emergency is very important to note; management should carry out equipment control efforts during the design stage.
Research Trends of Physics Local Wisdom in Scopus Database in Ten Years (2013-2022): A Bibliometric Analysis
Authors: Deta Utama Alan , Prahani Binar Kurnia , Suprapto Nadi , Diani Rahma
Published: January 2024

The country with the most variety of indigenous knowledge and local wisdom country in the world is Indonesia. Many academics today work to integrate aspects of the local culture into junior or senior high school curricula. The research examines a bibliometric analysis of local wisdom in physics education. The Scopus Database is being used for this bibliometric analysis. According to the findings, Indonesia dominated physics local wisdom research from 2013 to 2022. Even though there have not been many publications, most of the research has been published in conference proceedings. In addition, the Journal of Physics Conference Series is the journal that publishes the most publications related to physics local wisdom, followed by the AIP Conference Proceeding. Researchers need to explore deeply Physics Local Wisdom topics. Research and development need to be carried out in-depth related to the growing trend of physics local wisdom in the Scopus database.
Metaverse: A Paradigm Shift in STEM Education for Science Learning Beyond the Review
Authors: Saphira Hanandita V. , Prahani Binar K. , Hariyono Eko , Marianus
Published: January 2024

The integration of the Metaverse into innovative education has the potential to transform traditional teaching methods, offering new opportunities for both in-person and remote learning, ultimately making education more engaging and effective. This research aims to provide a cutting-edge assessment of how the Metaverse is integrated into education specific to science learning in the context of future employment. This article highlights its contemporary relevance and novel insights. This qualitative descriptive study uses data-gathering procedures based on the library research method. Metaverse platforms offer immersive and interactive experiences that enhance students’ understanding of scientific concepts. Metaverse-based science learning is not confined by geographic limitations, enabling a broader audience to access quality educational content. Researchers are increasingly interested in investigating the effectiveness of metaverse-based science learning, and industry support and investment drive innovation in this field. However, this study is limited in its reliance on Scopus as the sole source of articles. Nevertheless, this research is a valuable resource for educators seeking to integrate the Metaverse into science education. Researchers recommend that future researchers conduct more targeted literature reviews focusing on specific learning models, subjects, educational levels, and curriculum variations.
Literature Study of Tsunami Waves in the Study of Science and the Al-Qur’an
Authors: Anggraini Welly , Yuberti Yuberti , Santika Ria , Saputro Trimo , Syarlisjiswan Muhammad Ridho
Published: January 2024

This research aims to determine the movement of waves that cause tsunamis based on tsunami intensity values by connecting science and the Koran. The method used in this research is a literature study with a descriptive analysis approach. Data collection uses interview observation techniques, documentation and relevant literature. Based on the results of interview observations and BMKG documentation data, tsunami waves have different characteristics based on the modeling and movement of each cause, including landslides, subduction of the Indo-Australian Plate under the Eurasian Plate, volcanoes, and more influential causes of earthquakes. which occurs due to shifts in the earth’s plates which trigger the emergence of rolling waves called tsunamis. The scientific view is that tsunamis occur like earthquakes due to plate movements that occur, allowing friction or collisions between plates to occur. The result of this collision will cause one plate to rise and the other plate to subduct, this is often called subduction. This event will cause an earthquake. The earthquake that occurred is very likely to cause a tsunami. The explanation outlined in the Book of Allah has a broad dimension of knowledge and insight, especially discussing science and nature. The Qur’an’s view of tsunamis is that they are a disaster or calamity that occurs according to His will, tsunamis are absolutely due to the laws and provisions of Allah SWT for nature. These things are one of the signs of a small apocalypse.
Thermal Comfort Analysis in the Classrooms of the Faculty of Islamic Education and Teacher Training at UIN Raden Intan Lampung
Authors: Panggabean Siti Munawarah , Rizaini Mutiara Arda , Kuswanto Eko , Ardianti Indah Marlina , Andandaningrum Della
Published: January 2024

Thermal comfort in the classroom environment serves as a crucial factor influencing the quality of the teaching and learning process. Preliminary research reveals that a significant number of students at UIN Raden Intan Lampung have expressed complaints regarding excessively hot classroom conditions, lacking adequacy in creating comfort. The primary objective of this study is to assess the extent to which the level of thermal comfort can be achieved in the classrooms within the Faculty of Islamic Education at UIN Raden Intan Lampung. The research methodology applied in this study is qualitative and descriptive, with a focus on variables such as temperature, humidity, wind speed, and lighting levels. The purposively selected sample indicates that the classroom conditions in the Faculty of Islamic Education at UIN Raden Intan Lampung have not yet met the desired standards of thermal comfort.
The Implementation of Problem-Based Learning to Improve Students’ Writing Achievement in Argumentative Essay: Global Warming
Authors: Shafamarwa Shalsa , Thahir Andi , Puspita Adelia , Istifa Pirka Faiza , Wiliyanti Vandan , Rhama Dhanny Devieka
Published: January 2024

Argumentative essays have long been used in the topic of teaching and learning writing. The current research investigated whether Problem-Based Learning on the topic of global warming could facilitate students to improve their writing achievement. The subjects of this quantitative research were 33 students of the eleventh grade of Nurul Falah Vocational High School, Tanggamus, Lampung. The data were collected through writing tests (pre-and post). The result shows that there is a statistical improvement in the students’ writing achievement concerning global warming in an argumentative essay after being taught by using Problem-Based Learning. Furthermore, the result shows that the content appears to have the highest improvement compared to the other aspects. It indicates that Problem-Based Learning on the topic of global warming could facilitate students to improve students’ writing achievement.
Revolutionizing Education 4.0: Evaluating the Role of Robots in Learning Effectiveness
Authors: Umbara Destie Monikha Austriya
Published: January 2024

To address the challenges for society in using a wide range of knowledge and skills to find creative solutions using new, constantly evolving technologies, Education 4.0 proposes a transformative approach that integrates Industry 4.0 technologies and different teaching methods. This paradigm envisions personalized learning through real-time learner profiling and emphasizes the integration of robots in higher education, offering unprecedented opportunities to enhance learning experiences and skill development. Previous research shows that educational robots are becoming a significant technological tool, drawing interest among students for further exploration.The study aims to explore the historical development, types of robots used, and prominent themes and applications in higher education, providing valuable insights to educators, researchers, and policymakers. The study utilizes VOSviewer to visually present research on teacher leadership styles, analyzing articles from 1990 to 2023 and identifying five clusters of keywords. Keywords like “robotics,” “student,” and “engineering education” were prevalent. Recent discussions included keywords like “high education,” “Virtual reality,” “Intelligent robots,” and “Educational innovations.” Over the past decade, articles on robots in higher education have significantly increased, with Spain and the United States being major contributors to this field. The findings suggest that robots hold great potential in revolutionizing education, providing interactive and engaging experiences beyond traditional methods
Weiteres Etappenziel erreicht
Authors: Koch Peter
Published: January 2024

Die Pflege in Baden-Württemberg hat einen weiteren Meilenstein in Sachen Mitbestimmung erreicht. Etwa 113 000 Pflegefachpersonen wurden von den Arbeitgebern registriert und haben am 8. Januar 2024 Post vom Gründungsausschuss bekommen.
Associations between women’s retention in STEM or STEM-related fields and their spouses’ occupations and majors
Authors: Shen Ao
Published: January 2024

There is a growing awareness of the impact of women in science, technology, engineering, and mathematics (STEM) or STEM-related fields and the influence of marriage on women’s retention in those fields. This study examines the relationship between the continued employment of married women with STEM or STEM-related majors in relevant occupations and their spouses having the same field of occupation/major, as well as the difference in this association when considering the presence of children. This study analyzed a sample comprising 147,467 married college-educated women aged 25–55 years. The analysis was restricted to women with a STEM or STEM-related major and a spouse who was college-educated and employed. All the data were drawn from the 2015–2019 waves of data released by the American Community Survey (ACS). The results reveal that spousal occupational similarity is positively associated with married women’s retention in STEM and STEM-related (healthcare) occupations. Moreover, the presence of children is a moderator variable in the relationship between women’s employment in STEM or STEM-related occupations and their spouses’ having STEM or STEM-related occupations. This study aims to provide information for research on spousal homogamy, women’s career development, and women with STEM or STEM-related majors and their families.
Degradation of sulfuryl fluoride by dielectric barrier discharge synergistically with reactive gas
Authors: Zhang Ying , Wang Mingwei , Zhou Chang , Li Yalong , Yang Zhaodi , Zhang Xiaoxing
Published: January 2024

SO2F2 is widely used as a fumigant pesticide owing to its strong diffusion permeability, low residue, and high insecticidal speed. However, the strong greenhouse effect limits its application, and harmless treatment is also one of the problems. Dielectric barrier discharge (DBD) is an effective way to deal with harmful gas, and the treatment efficiency can be significantly improved by adding active gases such as H2O, H2, etc. In this paper, the effect of H2O and H2 on SO2F2 degradation by DBD is investigated. It shows the synergistic effect of reactive gas and DBD plasma on SO2F2 degradation that reactive particles generated from the discharge participate in the degradation of SO2F2 and hinder its recovery. When the input power is 80 W, the 2% SO2F2/1% H2O/97% Ar system achieves a degradation removal efficiency (DRE) of 86.26% and an energy yield (EY) of 13.55 g/kWh, while the 2% SO2F2/1% H2/97% Ar system shows a DRE and an EY of 80.29% and 12.61 g/kWh, respectively. However, in the 2% SO2F2/Ar system, the DRE and the EY are only 64.13% and 10.11 g/kWh, respectively. Moreover, the decomposition path of SO2F2 is analyzed, and it is found that SO2 and SOF2 are the main products in both H2O and H2 systems while the H2 addition generates solid S via the reduction of SO2F2. The results show that the addition of reactive gas can effectively promote the degradation and regulatory product of SO2F2, which provides support for the efficient and harmless degradation of SO2F2 in industry.
Improving the quality of the supersonic flow field of free-jet wind tunnels
Authors: Luo Taiyuan , Huang Zhiqiang , Lin Xuedong , Yin Jiang , Bai Benqi , Chen Ningli
Published: January 2024

The fixed-total-pressure-based air-blowing method in free-jet wind tunnels only produces uniformity in a limited area for supersonic jets. To address the issue, we investigated the effect of total pressure on static pressures at the nozzle exit and test chamber. We proposed an air-blowing method for pressure matching and established corresponding equations while suggesting ways to determine its parameters. The pressure-matching method was experimentally verified to analyze and compare the effects of different air-blowing methods and pressure-matching parameters on jet uniformity. The results of the study are as follows: (1) The pressure-matching-based air-blowing method improved the uniformity of the flow field at Mach numbers (Ma) of 1.5, 2.0, and 3.0 by 445.5%, 275%, and 215.8%, respectively, when compared to the air-blowing method that maintains the total pressure above the designed value. (2) The pressure-matching-based air-blowing method reduced the root-mean-square deviation in the Ma of the flow field at a Ma of 2.0 by 47.1% compared to the air-blowing method that maintains the total pressure at the designed value. The findings indicate that the proposed air-blowing technique based on pressure matching can enhance the uniformity of the supersonic jet and the area of the uniform region in the flow field. This method is highly significant in improving the capabilities of free-jet wind tunnel facilities.
Thermal effects associated with the crack of high-temperature superconducting magnetic levitation system
Authors: Li Hui , Huang Yi
Published: January 2024

Based on the magnetic flux pinning characteristics of the non-ideal type II superconductor YBa2Cu3O7−x, the high-temperature superconducting magnetic levitation system has the advantages of self-stability in levitation and low energy consumption. Thermal stress, electromagnetic force, and other mechanical stress may cause the micro-cracks to expand and eventually lead to fractures in the application of superconducting materials, significantly affecting the superconductor’s ability to transmit current. The superconducting magnetic levitation system with low damping is prone to nonlinear vibration of large amplitude under external interference, which affects the system’s regular operation. Due to the limitations of experimental conditions, it is difficult to analyze complex physical phenomena with cracks and obtain the distribution characteristics of electromagnetic, heat, and force inside the superconductor in the nonlinear vibration process, as theoretical modeling can compensate for this deficiency. In this paper, we study the fracture behavior of the YBa2Cu3O7−x bulk superconductor under nonlinear vibration based on the flux creep and flow models. The temperature of the superconductor in the nonlinear vibration of the superconducting levitation system is calculated with center cracks. The flux flow phenomenon in the bulk superconductor for various cracks under the bifurcation vibration is presented. The results show that the temperature of the superconductor will dramatically rise in nonlinear vibration under thermal insulation conditions, and the distribution position is affected by the cracks. For the 15 and 12 mm center cracks, a large amount of heat is generated around the crack and causes the temperature to rise above the critical temperature.
Numerical investigation of flow features for two horizontal rectangular polygons
Authors: Gul Farheen , Nazeer Ghazala , Sana Madiha , Shigri Sehrish Hassan , Ul Islam Shams
Published: January 2024

Studying fluid dynamics is crucial to advancing scientific knowledge and technological advancements worldwide. This study examines the behavior of a viscous fluid when it interacts with two horizontally positioned rectangular polygons arranged in a staggered arrangement. The lattice Boltzmann method is employed to analyze two-dimensional flow, specifically focusing on two physical parameters: Reynolds number, which is fixed at 150, and gap spacings, which vary simultaneously in X and Y directions. The results are analyzed by examining vortex snapshots, time trace histories of drag and lift coefficients, and power spectra analysis of lift coefficients. The progressive increase in the gap distances between the two horizontal rectangular polygons distinguishes seven separate flow vortex streets. The vortex shedding mechanism is disrupted at narrow gap spacings and reaches its ideal state at large gap spacings. There is the potential for the flow regime to be altered by the staggered alignment of rectangular polygons. Increasing the space between the polygons has a considerable impact on the flow characteristics brought about.
Influence of microwater on the decomposition of SF6/N2 gas mixture insulating media in overheating faults
Authors: Chen Haoxin , Zeng Xiaosong , Xiao Yanfeng , Li Haotian , Yao Qiang , Zeng Fuping
Published: January 2024

Currently, China is using the SF6/N2 gas mixture to gradually replace SF6 in GIS and other equipment. However, gas-insulated equipment will inevitably have local overheating faults. The SF6/N2 gas mixture will decompose to some extent at high temperatures. Impurities such as moisture in the equipment can affect this decomposition process. At present, there are fewer studies on the moisture content of the superheated decomposition of the SF6/N2 gas mixture. Therefore, this paper carries out the SF6/N2 mixed gas superheat decomposition experiment on the constructed superheat decomposition simulation experiment platform. By changing the content of trace water, the influence of trace water on the decomposition of the SF6/N2 mixed gas insulation medium with superheat failure was initially investigated. It is found that trace H2O will promote the generation of SF6 characteristic decomposition products, especially for the generation of SO2F2. The generation of SO2 in the product is the largest, and its generation process needs the full participation of H2O. In addition, the addition of trace water will also improve the yield of nitrogen-containing products NO and NO2, and under the experimental conditions of this paper, by adding the microwater, the yield reaches 100–300 µl/l. The reaction mechanism of H2O decomposition and combining with N atoms to generate NO and NO2 at high temperatures was analyzed in this paper. The thermodynamic properties of the main reaction paths and the equilibrium constants were calculated based on the density functional theory, which provided theoretical references for the further study of the mechanism of SF6/N2 superheated decomposition.
Determining matching capacitance for a variable distance WPT system considering ZVS
Authors: Lee Sungjin , Cheon Jeonghyeon , Park Heegeon , Kim Dongwook
Published: January 2024

Wireless Power Transfer (WPT) systems are widely used today across various applications. Due to their interoperability, there are many instances where the receiver can vary, and consequently, the air gap may differ depending on the application. In such distance-variable WPT systems, the self-inductance of the transmitting and receiving coils can change, which means that zero-voltage switching (ZVS) is not always guaranteed. In this paper, we propose a method to determine the matching capacitor that is sufficient to ensure ZVS in a distance-variable system. According to our theoretical approach, the matching capacitance should be determined for the farthest air gap. The proposed idea was verified through experiments, and the results demonstrate that the ZVS is guaranteed within the specified range of variable distances.
Effect of temperature on magnetic properties and magnetoimpedance effect of Co-rich glass-coated microwires
Authors: Corte-Leon P. , Skorvanek I. , Andrejka F. , Jakubcin M. , Zhukova V. , Zhukov A.
Published: January 2024

We studied the effect of heating on the magnetic properties and giant magnetoimpedance (GMI), effect of Co69.2Fe3.6Ni1B12.5Si11Mo1.5C1.2 glass-coated microwires with vanishing magnetostriction. We observed, that upon heating the hysteresis loop changed its shape from inclined to rectangular. These changes in hysteresis loop shape correlate with modification of magnetic field dependencies of GMI ratio, ΔZ/Z, from double-peak to single-peak and with change in value of maximum GMI ratio. The origin of the observed changes in the hysteresis loop and the GMI effect is discussed in terms of the Hopkinson effect, internal stresses relaxation upon heating, and the temperature dependencies of internal stresses and the magnetostriction coefficient.
Applying narratology to nursing practice
Authors: Maagaard Cindie Aaen , Lærkner Eva Ann
Published: January 2024

This article presents an exercise in applied narratology within the context of intensive care nursing, specifically the writing of diaries by nurses for patients to fill in memory gaps and alleviate trauma. The article discusses narrative from three perspectives: (1) as nursing practice, resulting in patient diaries with narrative characteristics and purposes; (2) as analysis of this practice, in a study coupling narrative and nursing theory and practice; and (3) as the application of narratological concepts into practice through dialogues with nurses, with the aim of transferring insights gained from the analysis and enabling nurses’ reflection on their positions, practices and power as narrators for patients. The article argues that narratology can be operationalized for nursing work, and there are compelling reasons for why it should, which necessitate methodological reflexivity and mutual curiosity, trust, and learning, and considerations about how far the remit of the narratologist, as a non-expert, extends.
Further step toward a definition of the core professional development needs of teachers of Languages for Specific
Purposes in the European Higher Education Area
Authors: Jurkovič Violeta , Mertelj Darja , Podgoršek Saša
Published: January 2024

In the attempt to make a further step toward a research-based definition of the core professional development
needs of teachers of languages for specific purposes (LSP), this paper aims to upgrade the framework of professional development
needs of LSP teachers developed by Bocanegra-Valle and Basturkmen (2019). With this
objective in mind, the paper will examine the differences in the professional development needs of LSP teachers in the European
Higher Education Area (EHEA) based on their experience with LSP teaching in higher education, qualification level, and LSP taught.
The results suggest that the core LSP teacher professional development needs are distributed across the categories of course
development, knowledge of the target discipline/profession/industry, knowledge of language use in the target
discipline/profession/industry, peer collaboration, and professional development opportunities. Efficient LSP teacher professional
development could be based on a three-stage model: a general LGP teaching methodology course, followed by a general LSP teaching
methodology course, and finally discipline-specific acculturation.
Deep-ultraviolet LEDs with an Al-graded p-AlGaN layer exhibiting high wall-plug efficiency and high modulation bandwidth simultaneously
Authors: Cui Bingyue , Yang Jie , Gao Xingfa , He Jiaheng , Liu Zhe , Cheng Zhe , Zhang Yun
Published: January 2024

This work demonstrated a deep-ultraviolet (DUV) LED with an Al-graded p-AlGaN contact layer above the electron blocking layer to alleviate p-type contact resistance, the asymmetry of carriers transport, and the polarization effect. The fitting results from the ABC + f(n) model revealed that the LED has a higher radiative recombination coefficient than the conventional structures ever reported, which contributes to a lower carrier lifetime. The light output power of the LED at 350 mA is 44.71 mW, the peak external quantum efficiency (EQE) at 22.5 mA is 5.12%, the wall-plug efficiency at 9 mA is 4.40%. The 3 dB electrical-to-optical modulation bandwidth of the graded p-AlGaN contact layer LED is 390 MHz after impedance matching. In short, this study provides an in-depth analysis of the physical mechanism of the enhanced EQE and decreased carrier lifetime of DUV LEDs with Al-graded AlGaN as a p-type contact layer.
Nano-electro-mechanical conduct of boron nitride nanotube as piezoelectric nanogenerators and nanoswitches
Authors: Ertekin Nilüfer
Published: January 2024

This study investigates various aspects related to the Internet of Things (IoT) and piezoelectric nanoswitches applications, including the frequency band and set-up of piezoelectric nanogenerators, the electrical-mechanical interactions of nanoswitch arrays and their switching times. To address these issues, the molecular dynamics simulations conducted to investigate the performance of a boron nitride nanotube (BNNT) in piezoelectric nanogenerator and nanoswitch applications. For the piezoelectric nanogenerator, BNNT with a diameter-to-length ratio of 0.09 and subjected to 1% compressing exhibited a bistable configuration with a snap-through activation energy of 0.8 meV and a resonance frequency of 48 GHz. These resonance conditions can be achieved by millimeter-wave frequencies under the U-band (40–60 GHz), resulting in axial polarization of 4 mC.m−2 and axial voltage of 13.4 volts. These results demonstrate the potential of BNNT as a broadband and non-linear piezoelectric nanogenerator. For piezoelectric nanoswitches applications, the BNNT zigzag type with a diameter-to-length ratio of 0.32 and subjected to 2.5% compressing displayed 0.017 C.m−2 axial polarization, 22 V axial voltage, and a rapid switching time of approximately 2.0 ns.
Q-homotopy analysis method for time-fractional Newell–Whitehead equation and time-fractional generalized Hirota–Satsuma coupled KdV system
Authors: Liu Di , Gu Qiongya , Wang Lizhen
Published: January 2024

In this paper, two types of fractional nonlinear equations in Caputo sense, time-fractional Newell–Whitehead equation (FNWE) and time-fractional generalized Hirota–Satsuma coupled KdV system (HS-cKdVS), are investigated by means of the q-homotopy analysis method (q-HAM). The approximate solutions of the proposed equations are constructed in the form of a convergent series and are compared with the corresponding exact solutions. Due to the presence of the auxiliary parameter h in this method, just a few terms of the series solution are required in order to obtain better approximation. For the sake of visualization, the numerical results obtained in this paper are graphically displayed with the help of Maple.
An improved effective liquid drop model for cluster radioactivity
Authors: Cui 崔 JianPo 建坡 , Xing 邢 FengZhu 凤竹 , Gao 高 YongHao 永浩 , Qi 齐 LiQian 立倩 , Wang 王 YanZhao 艳召 , Gu 顾 JianZhong 建中
Published: January 2024

The effective liquid drop model (ELDM) is improved by introducing an accurate nuclear charge radius formula and an analytic expression for assaulting frequency. Within the improved effective liquid drop model (IMELDM), the experimental cluster radioactivity half-lives of the trans-lead region are calculated. It is shown that the accuracy of the IMELDM is improved compared with that of the ELDM. At last, the cluster radioactivity half-lives that are experimentally unavailable for the trans-lead nuclei are predicted by the IMELDM. These predictions may be useful for searching for new candidates for cluster radioactivity in future experiments.
Leveraging patent analysis to measure relatedness between technology domains: an application on offshore wind energy
Authors: Wang Yiwen , Baker Erin , Goldstein Anna
Published: January 2024

As the global energy sector transitions towards a cleaner and more sustainable future, observational evidence suggests that many new energy technologies share a close relationship with well-established technologies. Yet, the topic of how closely technologies are related has not been addressed rigorously, rather it has been the purview of practitioner know-how and informal expert opinion. In this study, we propose a quantitative method to supplement practitioners’ subjective understanding of the relatedness between technology domains. The method uses patents to represent the position of a technology in knowledge space and calculates the Hausdorff distance between patent domains to proxy the relatedness between technologies. We apply this method to investigate the relatedness of offshore wind energy technology to two more mature domains: onshore wind energy technology and offshore oil and gas technology. We examine the technological relatedness of individual offshore wind components to these two technologies, and represent the changes in relatedness through time. The results confirm that offshore wind components such as foundations, installation, and maintenance are more related to the offshore oil and gas industry; while other components, such as rotors and nacelles, are more related to onshore wind energy. The results also suggest that many offshore wind energy components are becoming less related through time to both of these domains, possibly indicating increasing innovation. This method can provide quantitative parameters to improve the modeling of technological change and guide practitioners in strategic decision-making regarding the positioning of industries and firms within those industries.
Control Strategies of DFIG Technology-based Variable-Speed Wind Turbines-A Review
Authors: Giri Jayprakash , Mishra Neraj Kumar , Patra Ashish , Shukla M. K
Published: January 2024

This review paper examines the advancements and limitations of wind energy technology, while concentrating on the utilization of Doubly Fed Induction Generators (DFIG) to capture maximum power in variable speed winds. The paper evaluates the efficacy of several control strategies for DFIG relying on WT (wind turbines), on the basis of their simulation results, key features, and control objectives. The paper highlights the potential areas for investigation to improvise the performance as well as efficiency of wind energy generation.