bluuebunny/crossref_metadata_2025 huggingface dataset:
Cloud Accounting Application Program Analysis in Micro, Small, and Medium Business in Indonesia
Authors: Kartikasary Metya , Wicaksono Aries , Laurens  , Juvenia
Published: May 2023

The purposes of this research is to determine the benefit of the cloud accounting system in Micro, Small, and Medium (MSME), evaluate security system standards and policies on cloud accounting software in MSME, the changing roles of accountants in cloud accounting environment and find out the opportunities obtained from implementing cloud accounting systems for MSME and their future needs for MSME actors and accountants. The objects in this study are representative from MSME who use cloud accounting to assist their operational accounting processes and cloud accounting system provider. This research is a descriptive qualitative study in the form of case study, which uses primary data from observation and interviews. The result showed that efficiency, reliability, ease of use and the security of cloud accounting have significant effect towards business performance.
The Effect of Organizational Factors and Social Influence on the Digital Fluency of Accounting Students
Authors: Abdurrahim Hanif , Wibowo Rifqi Fachri , Widuri Rindang
Published: May 2023

Businesses and organizations have already integrated information and communications technology into their everyday work cycle, one of these technologies is Software-as-a-Service based cloud accounting applications, this makes digital fluency in the 21st century paramount for accounting students getting ready to dive into the working environment. The objective of this study is to prove the effect of organizational factors and social influence on the digital fluency of accounting students. This paper uses the quantitative method of data collection using electronic questionnaires, the data is then processed and observed using the Partial Least Squares Structural Equation Modelling (PLS-SEM) with the SmartPLS application. We have discovered through the study that organizational factors do, have a significant influence on behavioral intention, and how that intention significantly affects the actual use of SaaS, which in turn, has also a favorable influence on accounting students’ propensity for digital fluency. The findings of this study can be used for other related literature as a benchmark, and to also push organizations and universities to provide necessary help and resources for accounting students to become more digitally fluent in the 21st century through the use of SaaS.
The Effect of Earnings Volatility, Income Smoothing, Corporate Governance, and Firm Size on Earnings Quality Conventional Banks in Indonesia
Authors: Marsintauli Frihardina , Pribadi Aruni
Published: May 2023

Although there are many other factors that influence a country's economic development, banks are one of the most important factors in the economy. Considering that if the banking system is unstable and does not function efficiently, the allocation of funds will not work well, which can hamper economic growth. Therefore, the stability and financial system in the banking sector should be maintained and even enhanced for the sake of creating sustainable economic growth. The purpose of this research is to determine the effect of earning volatility, income smoothing, good corporate governance, and firm size on earnings quality. The object of the research was to use conventional banks listed on the Indonesian Stock Exchange in 2016-2019 period such as 30 companies which was determined through purposive sampling. The result of this research indicates that earning volatility and good corporate governance have no significant effect on earning quality but income smoothing and firm size have a significant effect on earning quality. Total assets and credit quality of the company can be seen from the level of maturity of the company which is considered to have prospects in generating better profits in the future and producing better returns. The information obtained from this research is expected to be used as consideration in making decisions regarding the importance of maintaining the quality of earnings in order to attract investors to invest in the company.
Disclosing the Impact of Millennial Attitude Toward Instagram Advertising on Their Attitude Toward Brand and Purchase Intention in Pandemic COVID-19
Authors: Setijanto Augustinus , Hamsal Mohammad , Furinto Asnan , Kartono Rano
Published: May 2023

The pandemic COVID-19 has brought changes in Indonesian consumer behaviour. Brands in Indonesia need to invest in Instagram advertisements to cope with the change in consumers' behaviour during the pandemic COVID-19. This study investigates the impact of Instagram's advertising effectiveness on building consumers' attitudes on brand and purchase intention. This study adopts a quantitative method through an online survey of 446 respondents. The data were analyzed using structural equation modelling (SEM). The result stated that entertainment and personalization positively influence millennial attitude toward Instagram advertising, and consumers' attitude toward Instagram advertising also positively influences their attitude toward the brand and regards their purchase intention. The study contributed to the advertising literature by extending the research on Instagram advertising and branding. This study contributes to the managerial application by enabling brands and marketers to create effective Instagram advertising that will lead to a positive response from consumers toward a brand.
The Impact of Automation on the Accounting Profession - The Perspective of Indonesian Accountants
Authors: Adrianto Christopher Jonathan , Tohang Valentina , Tandiono Rosaline
Published: May 2023

The purpose of this study is to examine the effect of automation on accountants and accountants’ work in Indonesia. In Indonesia, automation starts to be significant. Many companies have gradually integrated their operation with automated technology. Nevertheless, the overall implementation of automation in Indonesia is considered one of the lowest compared to other countries in the ASEAN region. Several accountants from across companies and industries were interviewed to get their insights. This study found that accountants in Indonesia are very aware of the emergence of technology, including automation in their jobs. They realized automation affects the required skills of accountants. Nevertheless, automation also creates the opportunity for a job promotion. This study shed some light on the effect of technology, particularly automation on accountants’ work in Indonesia.
The Effect of Pancasila Education, Civic Education, and Religion Education on Value Education for The Students During COVID 19 Pandemic
Authors: Benawa Arcadius , Lusia Erma , Alwino Alfensius , Irawan Iwan , Witono Petrus Hepi
Published: May 2023

During COVID-19 attack, there are change in the teaching and learning process from onsite to online. It is the challenge for the lecturers in Bina Nusantara to instill value education through Pancasila Education, Civic Education, and Religion Education to instill Value Education. In this situation the purpose of this study is to observe the extent of students' understanding of Pancasila Education, Civic Education and Religion Education on Value Education for the students during Covid-19 pandemic. This research used a quantitative method carried out by distributing questionnaires to 150 respondents as simple random sampling. The collected data were processed using SPSS 22, then completing it using path analysis. This research showed that Pancasila Education and Religion Education in Covid-19 pandemic significantly affect on Value Education. But there is no significant effect of Civic Education on the Value Education. The implication is that Pancasila Education and Religion Education should be delivered more intensively and seriously to instill value education more over Civic Education, so that the students as the young generation are not only having Pancasila, Civic, and Religion understanding but also can live up to the values which are used as core values by Bina Nusantara University.
Practical Study of Digital Learning and Virtual Laboratory in Post-Pandemic Era
Authors: Christabel Hana , Prawira Indra
Published: May 2023

The COVID-19 pandemic has accelerated the adoption of digital technology in educational institutions, with online learning platforms like Google Classroom, Zoom, WhatsApp, and virtual laboratories (VL) becoming the foundation for teaching and learning. Despite facing external challenges, the advantages of digital learning seem to outweigh the drawbacks. This qualitative study uses the technology acceptance model (TAM) to explore the continuous usage of digital learning in educational institutions in the post-pandemic era. Data is collected through semi-structured online interviews with 21 participants including principals, teachers, and students from high schools and broadcasting vocational schools in Jakarta, Tangerang, Central Java, and East Java, Indonesia. The results show that the perceived ease of use (PEU) of digital learning and virtual laboratories offers flexibility and familiarity in usage, while perceived usefulness (PU) offers productivity and effectiveness. Users are able to adapt and exhibit high frequency of usage, resulting in satisfaction. Hybrid or blended learning methods, particularly in broadcasting VL, are preferred to maximize students' learning outcomes in the post-pandemic era.
Remembering the Past for Better Future: Positive Effect of Nostalgia on Hope
Authors: Putri Arsrilisa Reina , Andangsari Esther Widhi , Hurriyati Evi Afifah , Fitri Rani Agias , Dhamayanti Meilani
Published: May 2023

Living in uncertainty situation is not easy for some human being. It gives effect for mental health and decreasing hope for sustainability harmonize living. Surprisingly, some people could live positively during crisis. It becomes a model on ‘how can we live such a tough situation’. This study explored the positive effect of nostalgia on hope during crisis such as the COVID-19 pandemic. The research applied predictive-correlational quantitative method with 315 emerging adulthoods from Indonesia having an age range from 18-25 years. Hope was measured using The Herth Hope Index (HHI) developed by Herth, adapted to the Indonesian version in the COVID-19 pandemic context by the authors. Meanwhile nostalgia was measured using the Indonesian version of State Functions of Nostalgia Scale which was adapted by Abraham, Ali, Andangsari, and Hartanti from Hepper, Ritchie, Sedikides, and Wildschut. Result has shown that nostalgia had a significant positive effect on hope. It can be concluded that nostalgia significantly gave a positive effect on hope during the uncertainty situation like the COVID-19 pandemic. Reminiscing a nostalgic memory that happened before the pandemic occurred help young people to eliminate negative mood, increase self-esteem, increase a perception of social relationships, and develop a perception towards the meaning of life which make someone less anxious.
Virtual Tour for Flores Expedition Digital Footprint and Future Potential
Authors: Utoyo Arsa Widitiarsa , Warbung Tobias , Hartono Hendri , Soedarso Nick
Published: May 2023

The Covid-19 pandemic caused the worldwide tourism industry to close. This reaction, diverse all the tourism stakeholders followed to make a revolutionary approach together with the virtual exhibition to preserve their sights firmly within the minds of potential site visitors in the virtual world. This looks at has incorporated the generation popularity model and protecting action selection version of the village and the culture to decide the factors that affect someone’s decision to undertake virtual exhibition as temporary alternatives for the duration of times of crises. Information had been gathered from a sample of four hundred accessed when they had qualified as a minimum one of the Virtual exhibition of Flores exhibition records web sites. The conclusions show that the qualifications of the village and visuals are powerful in predicting customers to see the virtual exhibition, reason to undertake digital exhibition and that adoption reason has an excessive quality effect on the tendency to visit the real website. Likewise, realistic implications are provided for online site managers to remember when choosing virtual exhibitions as a promotional tool.
Branding using Video Storytelling Approach: Bungbulang’s Village Identity
Authors: Rahayu Rr Ratna Amalia , Ratum Arifpermana , Zaini Sangid Gani , Fadillah Citra
Published: May 2023

The tourism sector is one of the most important aspects in its participation in building the economy of a country. Particularly in West Java, there are many places that can be developed, one of which is Bungbulang Village in Cianjur. However, Bungbulang Village faced many problems. Even though it has been declared a Tourism Village by the local government, it has not been known well by public. Some of the problems are the natural potential that has not been fully utilized, low education level, and below average economy. The pandemic causes a decrease in the level of visits to tourist areas. With these problems, community empowerment is necessary for the progress of Bungbulang Village. Increasing knowledge of the potential of nature and its care are vital, but no less important is the knowledge of branding so that Bungbulang Village is better known by the wider community. This research is expected to increase people’s knowledge about Bungbulang’s Village through video storytelling. The method used is descriptive qualitative with an ethnographic approach. Data was collected by interview and direct observation in Bungbulang Village. The research will produce video with storytelling approach as Bungbulang Village’s branding tool.
What Makes a Digital Language Learning Platform Work? A Usability and Quality Review
Authors: Rifai Irfan , Jhon Alex , Oktriono Kristianus , Marion Elisa Carolina
Published: May 2023

Due to the escalating usage of the internet and digital applications in recent years, foreign language learning experiences has become easier, simpler, and more fun for users. Consequently, to maintain those factors, usability and the quality of the platform are two main concerns for platform developers. To provide a personalized, structured, and gamified platform that offers opportunities for social interaction among users, researchers developed a digital language learning platform in middle of 2020. In 2021, the platform was tested on 3200 students who provided feedback on its usability through System Usability Scale. In addition, a small group of students were involved in an FGD session where they shared their experiences in using the platform. The usability test of the platform scored at 58, which implied that the platform still has some room for improvement. Through the FGD session, users could find information and functions related to the application easily and they expressed satisfaction toward the platform’s performance and valued the feedback opportunities. This research contributes to the field of a digital language learning platform development, especially when it is used by the students of higher education who wish to improve their foreign language mastery conveniently.
The Road to Developing Students’ Digital Fluency: The Role of Personality Traits
Authors: Paramita Greta Vidya , Godwin Raymond , Peranginangin Yan Andre , Wisudha Ayleen , Desson Stewart
Published: May 2023

The rapid development of technology, especially in the digital area, requires humans to develop. Understanding and the ability to use technology are no longer enough to deal with technological advances. Therefore, developing digital fluency in everyone is necessary, and higher education has a significant role in this. Personality description is chosen as the entrance to the development of digital fluency, especially for students. Using a questionnaire distributed through BINUS Maya, which was then connected to the Lumina Spark online system, we collected 2014 participants from various majors at the undergraduate level. Out of the 24 personality traits measured in the Lumina Spark, adaptable, flexible, and radical do not significantly correlate with personality. Through regression analysis, ten traits have a role in predicting students' digital fluency. The results of this study can be used to develop activity programs for students, especially in the classroom, so that the habituation process can run naturally along with lecture interactions.
The Determinants of Online Seller Loyalty in Express Delivery Service Providers
Authors: Leonita Lily , Benhardy Kartika Aprilia , Ariesty Warniancy , Ikhsan Ridho Bramulya
Published: May 2023

The service quality of delivery service companies is a significant factor in creating online seller loyalty; especially consumers demand that online sellers offer trusted and reliable delivery services. Customer experience is essential information for delivery service providers and online sellers. This study examines the determinants of seller loyalty based on perceived service quality when dealing with delivery service providers. In the survey, as many as 280 sellers were involved voluntarily, and they were randomly selected. The questionnaires were distributed online through a chat service provided by the e-commerce platform. Then, the survey results were analyzed using the PLS-SEM technique to answer the research hypothesis. As a result, all dimensions of service quality, including reliability, visual identification, relational capital, responsiveness, and technical quality, positively and significantly affect online seller loyalty. Technical quality is the main factor in forming seller loyalty to delivery service providers.
Beelic Website Design as an Information Center for Design, Promotion and Marketing of MSME Products in the Pandemic Period
Authors: Aprilia Hervina Dyah , Utoyo Arsa Widitiarsa , Warbung Tobias , Indahyani Titi
Published: May 2023

During this pandemic period, the obstacles faced by MSMEs (Micro, Small and Medium Enterprises) had a brutal impact on SME industries. In the interior, furniture and interior accessories are facilities that can be used together as an Information Centre, promotion and marketing that is effective, flexible, and multifunctional support business in the future. Naturally, business income has significantly decreased. Hence A strategic step and breakthrough are needed so that MSMEs can also take advantage of the market potential in the industrial era 4.0. This research aims to design the BEELIC website as a flexible tool that MSMEs can share in obtaining education, developing design knowledge, and promoting and marketing products. This research continues an Interior Research on recycling container waste with a Biophilic Design approach named BEELIC. The application of the biophilic element also makes SME products with added value. It has advantages that can meet market needs and become alternative solutions to the community's needs during the pandemic. Continuing the spirit of sustainability, people can discover the products of these MSMEs and various information BEELIC design solutions through the BEELIC website. Hence this website needs to be designed to meet these needs. From User Interface to user experience the methodology used is a literature review, online survey, case study, analyzing data, developing designs, making prototypes, evaluating, and producing the final site design. The case study in this research is a website design where the design and technology can fulfil the needs for information and solutions the MSMEs and people need.
Net Benefit on E-Invoice Implementation: Applying the Delone & McLean Information Systems Success Model
Authors: Wagiman Atara Nethania , Aspasya Gisella Septi , Prawati Levana Dhia
Published: May 2023

E-Invoice is one of the preeminent products of E-Government. It is an application used to make electronic tax invoices and connected to an online website to report VAT. As a tax collection and reporting instrument, E-Invoice is believed to have escalated the government's capability of tax collection since it is more convenient, integrated, transparent, fast, effective, and efficient. It is cutting a lengthy tax administration procedure into a more comprehensive and efficient way. Therefore, the development and adoption of this system are crucial for various countries around the world. Hence, this study aims to analyze the success factor of E-Invoice using Delone and McLean's Information System Success Model. 121 samples were collected from respondents who are experienced in using the E-Invoice. SEM PLS method is used to analyze the data. The results show that the E-Invoice system is not fully integrated, thus affecting the outcome of user satisfaction. Overall, system quality and information quality affect intention to use significantly and positively, while service quality affects intention to use positively but not significantly. Then user satisfaction affects Net Benefit significantly and positively. In the end, the adoption of E-Invoice accelerates the processing of tax invoices and VAT reporting, providing convenience, effectiveness, and efficiency to users.
What Rasch Model Tells About Intergenerational Ambidextrous Behavior Among Knowledge Workers
Authors: Herlina Maria Grace , Syahchari Dicky Hida
Published: May 2023

Knowledge workers are viewed as a critical resource for knowledge-based businesses in the knowledge era. Knowledge workers are those that are continually seeking innovative answers to problems. As part of human resource management, knowledge management makes it easier to produce, manage, and distribute the appropriate information to the right people in the right place at the right time. Knowledge sharing is the most crucial aspect of knowledge management. As older generations retire and subsequent generations take on leadership roles, the transfer of tacit knowledge is essential to the organization's sustainability. This study looks at the disparities in intergenerational knowledge workers' ambidextrous behaviors in the educational area. According to the Rasch Model, the hypothesis is statistically insignificant. It indicates no substantial variation in ambidextrous behavior among knowledge workers, in the educational area, based on age differences or intergenerational aspects. It implies that both generations of employees are naturally ambidextrous with little distinction.
In situ minority carrier lifetime via fast modulated photoluminescence
Authors: Poplawski Mateusz , Silva François , Vanel Jean-Charles , Roca i Cabarrocas Pere
Published: May 2023

Modulated photoluminescence (MPL) is a powerful technique for determining the effective minority carrier lifetime (τeff) of semiconductor materials and devices. MPL is based on the measurement of phase shifts between two sinusoidal waves (minimal amplitude excitation; and PL signal). In particular, in situ τeff has been proven to be an effective measurement at showing changes within a plasma-enhanced chemical vapor deposition reactor during fabrication of c-Si solar cells. However, the required time for a single measurement, using the previous method, was 40 s. In this paper a new input signal is proposed, called Dolphin's Wave, providing a method for decreasing the required measurement period to under 2 s, using superposition, frequency sweeps, and wavelets.
A hybrid-dG method for singularly perturbed convection-diffusion equations on pipe networks
Authors: Egger Herbert , Philippi Nora
Published: May 2023

We study the numerical approximation of singularly perturbed convection-diffusion problems on one-dimensional pipe networks. In the vanishing diffusion limit, the number and type of boundary conditions and coupling conditions at network junctions change, which gives rise to singular layers at the outflow boundaries of the pipes. A hybrid discontinuous Galerkin method is proposed, which provides a natural upwind mechanism for the convection-dominated case. Moreover, the method provides a viable approximation for the limiting pure transport problem. A detailed analysis of the singularities of the solution and the discretization error is presented, and an adaptive strategy is proposed, leading to order optimal error estimates that hold uniformly in the singular perturbation limit. The theoretical results are confirmed by numerical tests.
Near-infrared imaging for automated tsetse pupae sex sorting in support of the sterile insect technique
Authors: Argilés-Herrero Rafael , Salvador-Herranz Gustavo , Parker Andrew G. , Zacarés Mario , Fall Assane G. , Gaye Adji M. , Nawaz Arooj , Takáč Peter , Vreysen Marc J.B. , de Beer Chantel J.
Published: May 2023

Tsetse flies are the cyclical vectors of African trypanosomes and one of several methods to manage this vector is the sterile insect technique (SIT). The ability to determine the sex of tsetse pupae with the objective to separate the sexes before adult emergence has been a major goal for decades for tsetse management programmes with an SIT component. Tsetse females develop faster and pharate females inside the pupae melanise 1–2 days before males. This earlier melanisation can be detected by infrared cameras through the pupal shell, and the newly developed Near InfraRed Pupae Sex Sorter (NIRPSS) takes advantage of this. The melanisation process is not homogeneous for all fly organs and the pupa needs to be examined ventrally, dorsally and laterally to ensure accurate classification by an image analysis algorithm. When the pupae are maturing at a constant temperature of 24 °C and sorted at the appropriate age, 24 days post-larviposition for Glossina palpalis gambiensis, the sorting machine can efficiently separate the sexes. The recovered male pupae can then be sterilised for field releases of males, while the rest of the pupae can be used to maintain the laboratory colony. The sorting process with the new NIRPSS had no negative impact on adult emergence and flight ability. A mean male recovery of 62.82 ± 3.61% was enough to provide sterile males to an operational SIT programme, while mean contamination with females (4.69 ± 3.02%) was low enough to have no impact on the maintenance of a laboratory colony.
The effect of patient body mass index and sex on the magnification factor during pre-operative templating for total hip arthroplasty
Authors: Ashkenazi Itay , Morgan Samuel , Shaked Or , Snir Nimrod , Gold Aviram , Khoury Amal , Shemesh Shai , Warschawski Yaniv
Published: May 2023

Introduction: Pre-operative templating prior to hip arthroplasty has traditionally used implant-company-provided acetates, which assumed a magnification factor between 115% and 120%. In recent years, pre-operative planning has been performed with digital calibration devices, in order to calculate the magnification factor. However, these devices are not without their limitations and are not readily available at many institutions. As previous reports suggest a wide range of magnification factors, the determination of an optimal magnification factor is currently unclear. We investigated the relationship between obesity and gender on the magnification factor in order to improve the accuracy of pre-operative templating. Patients and methods: Ninety-seven consecutive pre-operative calibrated pelvic radiographs using the KingMark calibration were analyzed using the TraumaCad templating software. The magnification factor calculated by the software was considered the true magnification factor and analysis was made in order to assess the effect of sex and body mass index (BMI) on the magnification factor. A linear regression analysis was utilized to create a predictive model for optimal magnification factor value. Results: Magnification factor was significantly affected by sex (male, 120.0% vs. female 121.2%, p < 0.01) and by categorized BMI (obese 121.8% vs. non-obese 119.9%, p < 0.001). A positive linear association was found between BMI and the magnification factor (r = 0.544). The magnification factor was significantly different between the following sub-groups: obese female, non-obese female, obese male, and non-obese male (p < 0.001). When applying the model formulated by the linear regression analysis, the calculated magnification factor was within 2% of the true magnification factor for the majority of patients (n = 83, 85.6%). Conclusions: BMI and gender have a significant effect on the magnification factor. Future determination of the magnification factor should consider the influence of these variables in order to improve the accuracy of pre-operative templating in THA.
Quem colabora na gestão das Matas do Litoral? Uma análise exploratória da rede de agentes
Authors: Figueiredo Elisabete , Ribeiro Cristina , Ferreira Carla , Fernandes Eduarda
Published: May 2023

Os incêndios rurais de 2017 desencadearam na sociedade civil Portuguesa um debate alargado sobre decisões e ações de recuperação e valorização das florestas, assim como da necessidade de encontrar formas mais eficazes de participação pública e cooperação entre agentes. Neste sentido, compreender quem são os agentes e os atores sociais com interesse na gestão e ordenamento das florestas e as suas formas de articulação e criação de sinergias revela-se fundamental para a promoção e valorização daquele recurso. Com base nos resultados de um inquérito por questionário aplicado aos agentes em presença nos territórios que compõem as Matas do Litoral afetados pelos incêndios de 2017 (N= 175), averiguou-se a sua perceção acerca da influência e interesse na gestão destes territórios, assim como se aumentou a compreensão das suas formas de interação e cooperação. Os resultados demonstram que, ainda que exista alguma colaboração entre os vários tipos de agentes, o ICNF é, sem surpresa, a entidade central, moldando também os níveis de influência e as interações entre aqueles agentes. Os resultados demonstram igualmente uma descoincidência entre os níveis de interesse na gestão e ordenamento das Matas do Litoral (geralmente elevados) e os níveis de influência percecionados pelos agentes nestes processos (geralmente reduzidos).
Recent Advancements in Triazole-based Click Chemistry in Cancer Drug Discovery and Development
Authors: Yadav Ashok Kumar , Mishra Vivek , Kumar Deepak , Kumar Arun
Published: May 2023

Triazole-based compounds possess a broad range of activity and can be synthesized using click chemistry. Many new chemotherapeutic agents have been developed in recent years by exploiting click chemistry and these are covered in this review.
Hopping mechanism of heat transfer in cyclic hydrocarbons
Authors: Konstantinov V. A. , Krivchikov A. I. , Sagan V. V. , Karachevtseva A. V.
Published: May 2023

The increase in thermal conductivity with temperature in the dynamically orientationally disordered phases of cyclic hydrocarbons is explained by the recently proposed thermal activation mechanism of heat transfer. It is shown that high-temperature thermal conductivity is well described by the Arrhenius dependence. Activation energies and pre-exponential factors are determined. It is shown that the activation energies do not depend on the sample density. The dependence of the pre-exponential factor on the activation energy of a number of cyclic hydrocarbons was analyzed.
Doping tuned anomalous Hall effect in the van der Waals magnetic topological phases Mn(Sb1 − x
Bi
x
)4Te7
Authors: Zhang 张 Xin 鑫 , Jiang 江 Zhicheng 志诚 , Yuan 袁 Jian 健 , Hou 侯 Xiaofei 骁飞 , Wang 王 Xia 霞 , Yu 余 Na 娜 , Zou 邹 Zhiqiang 志强 , Liu 刘 Zhengtai 正太 , Xia 夏 Wei 威 , Yu 于 Zhenhai 振海 , Shen 沈 Dawei 大伟 , Guo 郭 Yanfeng 艳峰
Published: May 2023

The van der Waals (vdW) MnSb4Te7 is a newly synthesized antiferromagnetic (AFM) topological insulator hosting a robust axion insulator state irrelative to the specific spin structure. However, the intrinsic hole doped character of MnSb4Te7 makes the Fermi level far away from the Dirac point of about 180 meV, which is unfavorable for the exploration of exotic topological properties such as the quantum anomalous Hall effect (QAHE). To shift up the Fermi level close to the Dirac point, the strategy of partially replacing Sb with Bi as Mn(Sb1−x
Bi
x
)4Te7 was tried and the magnetotransport properties, in particular, the anomalous Hall effect, were measured and analyzed. Through the electron doping, the anomalous Hall conductance σ
AH changes from negative to positive between x = 0.3 and 0.5, indicative of a possible topological transition. Besides, a charge neutrality point (CNP) also appears between x = 0.6 and 0.7. The results would be instructive for further understanding the interplay between nontrivial topological states and the magnetism, as well as for the exploration of exotic topological properties.
Visibility graph approach to extreme event series
Authors: Zhang 张 Jing 晶 , Chen 陈 Xiaolu 晓露 , Wang 王 Haiying 海英 , Gu 顾 Changgui 长贵 , Yang 杨 Huijie 会杰
Published: May 2023

An extreme event may lead to serious disaster to a complex system. In an extreme event series there exist generally non-trivial patterns covering different time scales. Investigations on extreme events are currently based upon statistics, where the patterns are merged into averages. In this paper from extreme event series we constructed extreme value series and extreme interval series. And the visibility graph is then adopted to display the patterns formed by the increases/decreases of extreme value or interval faster/slower than the linear ones. For the fractional Brownian motions, the properties for the constructed networks are the persistence, threshold, and event-type-independent, e.g., the degree distributions decay exponentially with almost identical speeds, the nodes cluster into modular structures with large and similar modularity degrees, and each specific network has a perfect hierarchical structure. For the volatilities of four stock markets (NSDQ, SZI, FTSE100, and HSI), the properties for the former three’s networks are threshold- and market-independent. Comparing with the factional Brownian motions, their degree distributions decay exponentially but with slower speeds, their modularity behaviors are significant but with smaller modularity degrees. The fourth market behaves similar qualitatively but different quantitatively with the three markets. Interestingly, all the transition frequency networks share an identical backbone composed of nine edges and the linked graphlets. The universal behaviors give us a framework to describe extreme events from the viewpoint of network.
Ideal Bose gas and blackbody radiation in the Dunkl formalism
Authors: Merabtine F , Hamil B , Lütfüoğlu B C , Hocine A , Benarous M
Published: May 2023

Recently, deformed quantum systems have received lots of attention in the literature. Dunkl formalism differs from others by containing the difference-differential and reflection operator. It is one of the most interesting deformations since it let us discuss the solutions according to the even and odd solutions. In this work, we studied the ideal Bose gas and the blackbody radiation via the Dunkl formalism. To this end, we made a liaison between the coordinate and momentum operators with the creation and annihilation operators, which allowed us to obtain the expressions of the partition function, the condensation temperature, and the ground state population of the Bose gas. We found that Dunkl-condensation temperature increases with increasing θ value. In the blackbody radiation phenomena, we found how the Dunkl formalism modifies total radiated energy. Then, we examined the thermal quantities of the system. We found that the Dunkl deformation causes an increase in entropy and specific heat functions as well as in the total radiation energy. However, we observed a decrease in the Dunk-corrected Helmholtz free energy in this scenario. Finally, we found that the equation of state is invariant even in the considered formalism.
Clifford odd and even objects offer description of internal space of fermions and bosons, respectively, opening new insight into the second quantization of fields
Authors: Borštnik Norma Susana Mankoč
Published: May 2023

In a long series of works the author has demonstrated that the model named thespin-charge-familytheory offers the explanation for all in thestandard modelassumed properties of the fermion and boson fields, as well as for many of their so far observed properties if the space-time is ≥ (13 + 1) while fermions interact with gravity only. In this talk, I briefly report on the so far achievements of the theory. The main contribution demonstrates the offer of the Clifford odd and even objects for the description of the internal spaces of fermion (Clifford odd) and boson (Clifford even) fields, which is opening up a new understanding of the second quantization postulates for the fermion and boson fields: The “basis vectors” determined by the Clifford odd objects demonstrate all the properties of the internal space of fermions and transfer their anti-commutativity to their creation and annihilation operators, while the “basis vectors” determined by the Clifford even objects demonstrate all the properties of the internal space of boson fields and transfer their commutativity to their creation and annihilation operators. The toy model withd= (5 + 1) illustrates the statements.
Electromagnetic properties of the quantum vacuum calculated from its structure
Authors: Mainland G. B. , Mulligan Bernard
Published: May 2023

Maxwell’s equations and quantum electrodynamics are valid for any value of the permittivity ϵ0 of the vacuum; therefore, something additional is required to establish the value of ϵ0. A fundamental postulate of physics is that the properties of a physical system are determined by its structure. Since ϵ0 is an electromagnetic property of the vacuum, it should be possible to calculate ϵ0 using Maxwell’s equations and quantum electrodynamics to describe the interaction of photons with the quantum vacuum. The feature of the quantum vacuum that allows for such interactions is the presence of vacuum fluctuations that appear as particle-antiparticle pairs. To minimize the violation of energy conservation and conserve angular momentum, the pair appears with zero center-of-mass momentum in the most tightly bound state that has zero angular momentum. Because vacuum fluctuations each appear as a bound state, the permittivity of the vacuum can be calculated somewhat similarly to the way that the permittivity of a dielectric is calculated, yielding ϵ0 ≃ (6μ
o/π)(8e
2/ħ)2 = 9.10 × 10−12C/(Vm), which is 2.8% larger than the experimental value. Formulas for the speed of light in the vacuum and the fine-structure constant follow immediately from the formula for ϵ0.
Quantum coherence of relativistic wavepackets in electromagnetic vacuum
Authors: Lin Shih-Yuin
Published: May 2023

We have developed a linearized effective theory with quantum mechanical Gaussian wavepacket of a charged relativistic particle coupled to quantum electromagnetic fields at a scale well below the Schwinger limit. Using this effective theory, we study the quantum decoherence of single electrons at rest due to their interactions with electromagnetic vacuum. According to the existing data of electron interference experiments in electron microscopes, the values of the parameters in our effective theory are chosen. With these values, we find that weak decoherence by vacuum fluctuations may have blurred the interference pattern in Ref. [1].
Solar Hybrid System for Electricity and Air Heating - Experimental Research
Authors: Budea S , Simionescu Ş M
Published: May 2023

In the current energy context, solar energy is the cheapest source of renewable energy. Photovoltaic solar cells (PV) and air thermal collectors (ATC) are used to convert solar irradiation into electricity and heat. In this research a model for a hybrid solar system consisting in a photovoltaic panel behind which is a hot air collector was designed and tested. This system produces both electricity and heat, from the sun, based on principle two in one. In the Romanian climatic conditions, such solar systems can be easily integrated into residential or office buildings. By cooling with air, the photovoltaic panel and recovering the thermal energy, the electric power increase with about 7.905% for a solar irradiance of 750 W/m2. The warm air collected from behind the panel had a temperature of 5.5° C (Celsius degrees) higher, depending on the air velocity provided by the tangential fan. The experimental research demonstrates the efficiency of a PV-ATC hybrid system: 11.16% for the electrical efficiency, 45.27% for the thermal efficiency and 56.44% for the total efficiency.
The influence of ventilation on indoor air quality in buildings with variable pollutant emissions
Authors: Vasile V , Iordache V , Radu V M
Published: May 2023

Indoor Air Quality (IAQ) assurance is done mainly through the air exchange between interior and exterior. Lack of adequate ventilation of indoor spaces causes poor air quality and a higher incidence of sick building syndrome (SBS), which is manifested by affecting the comfort and wellbeing in the indoor spaces. Ensuring high energy performance buildings and indoor air quality is efficiently approached by limiting emissions from sources, by partial neutralization of the pollutants or by smarter ventilation. The concept of smart ventilation was developed to ventilate properly while reducing energy loads, allow for the provision of grid services, and promote associated renewable power integration. The above-mentioned information can be obtained by the air quality modelling, using mathematical approaches to predict the way pollutants behave in a certain environment or time scale. The paper presents the results obtained by mathematical modelling of indoor air quality, by including the transfer of pollutants from external sources and variable indoor emissions. The considered pollutants are ozone (O3), particulate matter (PM2.5), formaldehyde (HCHO) and carbon dioxide (CO2), due to the significant adverse effects on human health and their different preponderantly sources: indoor, outdoor or both indoor and outdoor. The main goal of our researches is the reducing of the amount of energy that ventilation uses while maintaining or improving IAQ.
Triggering Deep Renovation of Buildings in Portugal
Authors: Aelenei D , Aelenei L E
Published: May 2023

EU and national buildings related regulations are moving towards policies that improve indoor thermal comfort, reduce energy consumption and its environmental impact by establishing very ambitious targets in the emissions reduction in the decades to come. In this context, improving energy efficiency through deep energy renovations is a key action line because of its potential to meet long-term climate and energy targets. However, deep renovations need to become more environmentally friendly, more reliable in terms of performance and more attractive to all concerned stakeholders, in addition of enabling the implementation of the Near Zero-Energy Building (nZEB) assumed by the Energy Performance of Building Directive in 2010. This paper highlights the key aspects related to the strategic pillars of deep renovation and explore ongoing related funding schemes to meet Portugal´s carbon neutrality and related sustainability goals.
MXenes hierarchical architectures: electromagnetic absorbing, shielding and devices
Authors: Wang Qiang-qiang , Cao Wen-qiang , Cao Mao-sheng
Published: May 2023

Layered transition metal carbides or nitrides (MXenes), as a novel two-dimensional material, are widely used in the field of electromagnetic (EM) functions and devices due to their unique EM properties. However, the excessive conductivity of MXenes nanosheets often causes impedance mismatch, resulting in a single EM function. Moreover, original MXenes nanosheets are too small in size and needed to be dispersed in the matrix during application, resulting in inconvenience and unstable performance. Architecture strategy is an effective way to handle these problems. Assembling MXenes nanosheets into hierarchical structures, on the one hand, can effectively tailor conductivity, optimize impedance, and tune the EM response of MXenes, achieving multiple EM functions, on the other hand, can obtain directly usable macro assemblies. Herein, we systematically summarize various methods for fabricating MXenes hierarchical architectures, gaining deep insight into the EM response mechanism. Subsequently, the multiple EM functions including EM absorption and EM interference shielding were concluded. More importantly, rich progress has been made in EM functional devices based on MXene, but there is no review in this regard. We have provided a comprehensive summary of relevant excellent work in this review. Ultimately, we have provided insightful commentary on the challenges in this area and predicted the future direction.
Engineering multi-relaxation interfaces in Ti3C2T
x
for reducing wideband radar cross section
Authors: Liu Ting-Ting , Cao Wen-Qiang , Yuan Quan , Zhang Min , Cao Mao-Sheng
Published: May 2023

The development of multifunctional electromagnetic wave (EMW) absorbing materials become the inevitable course for the rapid progress of military weapons and 5 G smart communication technology. The construction of engineered multi-relaxation interfaces provides an effective means for materials to enhance EMW attenuation. Herein, MXene derived Ti3C2T
x
/TiO2 heterogeneous interface is tailored through the in-situ anneal, where the multi-relaxation nano-interfaces are achieved. When the annealed temperature reaches 450 °C, the maximum reflection loss of Ti3C2T
x
/TiO2 is −30.4 dB at 5.67 GHz due to the enhanced interfacial polarization and optimized impedance matching. More importantly, an effective reduction in the radar cross section up to −53 dBm2 was achieved by using the Ti3C2T
x
/TiO2 as the octagonal patch through effective shape design. Therefore, we believe that Ti3C2T
x
/TiO2 with optimized shape has a broad application prospect in the field of radar stealth and practical electromagnetic protection.
Understanding the complementary resistive switching in egg albumen-based single sandwich structure with non-inert Al electrode
Authors: Xiao Xia , Guo Jiajun , Gao Zexin , Zhai Dashuai , Liu Ruxin , Qin Shuchao , Alam Mehran Khan , Sun Zhi
Published: May 2023

The concept of complementary resistive switching (CRS) has been proposed as a potential solution for mitigating the unwanted sneak path current intrinsic to large-scale crossbar memory arrays. In this study, CRS devices based on egg albumen are fabricated using non-inert Al layers as the top electrodes (TE). The Al/Albumen/indium tin oxide (ITO) single sandwich structure achieves stable and reproducible CRS behavior without requiring a forming process. The application of a compliance current leads to an evolution from CRS to bipolar resistive switching (BRS). Furthermore, the BRS analog switching feature enables the emulation of synaptic functions, like paired-pulse facilitation (PPF) and paired-pulse depression (PPD). Our systematic and in-depth analyses demonstrate that the CRS is due to the interfacial Schottky barriers originating from the Al electrode oxidation. Consequently, the resistance switching behavior in the albumen-based cells with inert Pt top electrodes can further validate this model. These findings provide significant insight into the role of non-inert electrodes and contribute to a comprehensive understanding of the CRS mechanism, which may facilitate the development of high-performance CRS biodevices.