bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of Co-Channel Interference in Connected Vehicles WLAN with UAV
Authors: Wang Maolin , Ma Xu , Wang Zhi , Guo Yang
Published: February 2022

Unmanned aerial vehicle (UAV) has the advantages of flexibility, strong controllability, and easy deployment. It provides wireless communication with low delay and high throughput. However, under the background of the increasing shortage of spectrum resources, the frequency band resources of UAV systems are tight, resulting in increasingly serious co-channel interference between services, and the communication quality cannot be effectively guaranteed. Therefore, it is very important to evaluate the co-channel interference of UAV system and improve its spectral efficiency. This paper introduces the interference model for the research and analysis of the frequent coexistence of UAV and connected vehicles WLAN system and applies the model to evaluate the co-channel interference of UAV in the ISM frequency band of 2.4 GHz. The actual receiver filter is modeled and analyzed, the FDR mathematical expression for changing the protection band is derived, and two UAV interference signal waveforms, cyclic prefix orthogonal frequency division multiplexing waveform and windowed orthogonal frequency division multiplexing waveform, are proposed to effectively improve the utilization of frequency resources. After simulation, the interference of the interfered connected vehicles WLAN system is calculated and compared with the relevant service interference threshold standards issued by the International Telecommunication Union. To ensure that the UAV will not interfere with the connected vehicles WLAN system in the ISM frequency band of 2.4 GHz, the protection height of the UAV system in China is 6.2 km.
An IoT-Based Smart System with an MQTT Broker for Individual Patient Vital Sign Monitoring in Potential Emergency or Prehospital Applications
Authors: Tsao Yung-Chung , Cheng Fu-Jen , Li Yi-Hua , Liao Lun-De
Published: January 2022

Emergency care is a critical area of medicine whose outcomes are influenced by the time, availability, and accuracy of contextual information. The success of critical or emergency care is determined by the quality and accuracy of the information received during the emergency call and the data collected during emergency transportation. The Internet of Things (IoT) consists of many smart devices and components that communicate via their connection to the Internet, which is used to collect data with sensors that obtain personal health parameters. In the past, most health measurement systems were based on a single dedicated orientation, and few systems had multiple devices on the same platform. In addition to traditional health measurement technologies, most such systems use centralized data transmission, which means that health measurement data have become the exclusive intellectual asset of the system developer. Therefore, this study develops an IoT-based message-broker system that is deployed and demonstrated for five health devices: blood oxygen, blood pressure, forehead temperature, body temperature, and body weight sensors. A central controller accessed by radio-frequency identification (RFID) collects clients’ health profiles on the cloud platform. All collected data can be quickly shared, analyzed, and visualized, and the health devices can be changed, added to, and removed reliably when the requirements change. Additionally, following the message queuing telemetry transport (MQTT) protocol, all devices can communicate with each other and be integrated into a higher-level health measurement standard (such as blood pressure plus weight or body temperature plus blood oxygen). We implement a smart healthcare monitoring system (SHMS) and verify its reliability. We use MQTT to establish an open communication format that other organizations can follow to perform individual patient vital sign monitoring in potential applications. The robustness and flexibility of this research can be verified through the addition of other systems. Through this structure, more large-scale health detection devices can be integrated into the method proposed in this research in the future. Personal RFID or health insurance cards can be used for personal services or in medical institutions, and the data can easily be shared through the mechanism of this research. Such information sharing will enable the utilization of medical resources to be maximized.
Distribution and Frequency of ABO and Rhesus (D) Blood Groups in Somalia: A Retrospective Study on Students of Jazeera University, Mogadishu‐Somalia
Authors: Mohamud Mohamed Hayir Tahlil , Aweis Abdullah Dahir H. , Adam Abdiwahab Sheikh Elmi , Mohamed Farhia Abdullahi , Fidow Safia Qasim , Mohamed Lul Mohamud
Published: January 2022

Background. There are differences in the distribution and frequency of ABO and D blood groups in different populations of the world. Relatively very little information is available about blood group distributions in the Somali population. Objectives: To identify the distribution and frequency of ABO and D blood groups among the Somali people. Methods. A retrospective cross‐sectional study of 1811 enrolled students of Jazeera University was conducted in Jazeera University diagnosis and research center, Mogadishu‐Somalia from December 2017 to December 2020. The result was presented as the frequency of each blood group with percentage. A Fisher’s exact test was carried out to test the significant association of the ABO blood group with sex and D antigen with sex. Results. Blood group O was the most prevalent (61%), followed by A (27%), B (10%), and AB (2%). The D‐antigen was present in 97% of participants and 3% were D‐negative. The distribution of O+, A+, B+, AB+ among D‐positive subjects were 62%, 27%, 9% and 2.0% while that of O‐, A‐, B‐ and AB‐ among D‐negative subjects were 57%, 27%, 12% and 3%, respectively. The frequencies of ABO and D‐antigens in both male and female subjects were O > A > B > AB. However, this study found no significant difference of ABO with Sex and D‐antigens with sex (P-value>0.05). Conclusions. The frequency of ABO and D blood groups among the Somalia population was found to be O > A > B > AB which was similar to those reported from most East African populations.
Research on MOOC Teaching Mode in Higher Education Based on Deep Learning
Authors: Tian Yuan , Sun Yingjie , Zhang Lijing , Qi Wanqiang
Published: January 2022

With the rapid development of computer technology and network technology and the widespread popularity of electronic equipment, communication among people is more dependent on the Internet. The Internet has brought great convenience to people’s lives and work, and the Internet data is constantly being recorded. People’s data information and behavior information, which provides the basis for data mining and recommendation systems, mining users’ information and behaviors, and providing “user portraits” for each user, can provide better services to users and it is also an important part of the recommendation system. In one step, this article takes MOOC education resources as the research goal. In order to improve the effective management of MOOC platform resources based on traditional methods, this article combines relevant data sets and recommendation techniques to initially build a learning platform, implements a deep neural network algorithm, and recommends related services. The request and response data were explained, and through the online learning data set, based on the learner’s historical learning records, the learning resources were simulated and recommended to the learners. The resource customization module was elaborated. Through the results of resource recommendation, a personalized learning resource recommendation platform was initially realized, which more intuitively demonstrated the recommendation effect and better realized the teaching management of the MOOC platform.
Components of NOTCH Signaling for Uterine Cancer Patients’ Prognosis
Authors: Lachej Nadezda , Dabkeviciene Daiva , Simiene Julija , Sabaliauskaite Rasa , Jonusiene Violeta , Brasiunas Vytautas , Sasnauskiene Ausra , Vaicekauskaite Ieva , Brasiuniene Birute , Kanopiene Daiva , Suziedelis Kestutis , Didziapetriene Janina
Published: January 2022

New molecular biomarkers that could have an independent prognostic value in endometrial cancer are currently under investigation. Recently, it was suggested that genetic changes in the Notch signaling pathway could be associated with the development of endometrial carcinoma. This study aimed to determine the expression of the Notch signaling pathway components in tumour and adjacent normal uterine tissue and to evaluate their importance for the survival of uterine cancer patients. The present study was performed on uterine body samples collected from 109 patients and paired adjacent noncancerous endometrial tissue samples. Kaplan–Meier curves and Cox regression were used for survival analyses. Expression alterations of NOTCH2, NOTCH3, NOTCH4, JAG2, and HES1 were evaluated as independent and significant prognostic factors for uterine cancer patients.
Studies on Virulence and Extended‐Spectrum β‐Lactamase‐Producing Uropathogenic Escherichia coli Isolates and Therapeutic Effect of Fosfomycin in Acute Pyelonephritis Mice
Authors: Zhang Lingchun , Li Fenfen , Li Xiaotian
Published: January 2022

The understanding about virulence factors (VFs) and the drug resistance of uropathogenic Escherichia coli (UPEC) helps us understand the pathogenesis of urinary tract infections (UTIs) and make better decisions for clinical treatment. This study examined the correlation between the extended‐spectrum β‐lactamases (ESBLs) phenotype and VFs in UPEC strains. In addition, we validated the therapeutic potential of fosfomycin in acute pyelonephritis mice. From May 2017 to November 2018, 22 nonduplicate E coli. strains were isolated from UTI patients. PCR was utilized to detect the distribution of virulence genes. We also analyzed the ESBL phenotype in E coli. We further evaluated the therapeutic effect of intravenous fosfomycin treatment in the acute pyelonephritis (APN) model. All 22 UPEC strains expressed the type 1 fimbriae (FimH) gene and more than 50% (12/22) of strains produced ESBLs. The detection rates of the iron acquisition‐associated genes ChuT and IutA were 77.3% (n = 17) and 50% (n = 11) and those of P fimbria papA and papC genes were 45% (n = 10) and 50% (n = 11), respectively. Though the VFs were closely related with pathologenicity, the relationship between VFs and ESBLs still needs further investigation. Furthermore, intravenous fosfomycin 800 mg/kg significantly reduced the bacterial load and the inflammatory infiltration in the bladder and kidney, maintaining the structural integrity of the kidney. Intravenous fosfomycin administration can be used for the treatment of acute pyelonephritis caused by highly pathogenic and drug‐resistant UPEC strains.
Enhanced Virtualization-Based Dynamic Bin-Packing Optimized Energy Management Solution for Heterogeneous Clouds
Authors: Gupta Neha , Gupta Kamali , Gupta Deepali , Juneja Sapna , Turabieh Hamza , Dhiman Gaurav , Kautish Sandeep , Viriyasitavat Wattana
Published: January 2022

Cloud computing provides unprecedented advantages of using computing resources with very less efforts and cost. The energy utilization in cloud data centers has forced the cloud service providers to raise the expense of using its services and has increased the carbon footprints in the environment. Many static bin-packing algorithms exist which can reduce energy by some percentage, but with new era of digitization, advanced and dynamic techniques are required which can serve heterogeneous users and random users’ requests. Thus, in this paper, two new dynamic best-fit decreasing-based bin-packing algorithms are proposed wherein the first technique is for service providers and focuses on increasing server utilization and the second approach acts as a switcher to harness best results among all algorithms. Both techniques deliberately achieve high performance in terms of total energy consumption, resource utilization, and makespan along with serving continuous and varying requests from customers. The simulations are performed using Java. The results exhibited that DEE-BFD can escalate resource utilization by 96% and EM switcher can reduce total energy consumption by 49% and reduce makespan by 56%.
Fractional Study for Transient Free Convection Flow in a Channel with Mittag-Leffler Memory
Authors: Sarwar Shahzad , Aleem Maryam , Asjad Muhammad Imran , Muhammad Taseer
Published: January 2022

Fractional-order convective transient flow of viscous and incompressible fluids transiting through two infinite hot parallel upright plates is investigated analytically in the presence of chemical reaction, radiative heat flux, and mass diffusion at the boundary. A physical model for transient incompressible unsteady flow is developed with a comparatively new fractional derivative, namely, Atangana–Baleanu with nonsingular, nonlocal kernel. The developed fractional model is studied with means of an integral transform, i.e., Laplace transform method. Results obtained for the concentration, velocity, and temperature are expressed in the form of generalized

M
q
p

y

function. The impact of various physical parameters like fractional and flow parametric quantities is demonstrated diagrammatically. At last, we envisioned that for the fractional model, temperature and concentration could be enhanced for smaller fractional parameter

α

values while velocity for larger values of

α

, respectively. The proposed model gives the better results in the presence of memory effect besides the Caputo and Caputo–Fabrizio model when compared with the existing literature.
Clinical Manifestations of Inferior Vena Cava Injuries and the Progress of Emergency Treatment
Authors: Liu Chao , Zhang Hao , Xiang Shaotao , Liu Liang
Published: January 2022

In this paper, clinical manifestations of inferior vena cava injuries and the progress of emergency treatment are presented. Inferior vena cava (IVC) is the large vein returning venous blood from the lower limbs and pelvic and abdominal cavities to the right atrium of the heart. The clinical manifestations of IVC injuries include shock, progressive hemorrhage, air embolism, retroperitoneal hematoma, active bleeding, and hemoperitoneum. The patients may be combined or not combined with injuries to other organs or even die. Routine examination methods for IVC injuries include general examination, color Doppler ultrasound, abdominal contrast-enhanced CT, magnetic resonance spectroscopic imaging (MRSI), and IVC angiography. These examinations are usually performed to confirm the diagnosis. Surgical treatment is the primary emergency treatment for this condition. Increasing the blood volume and symptomatic treatment are auxiliary treatments. The surgeries and repairs for IVC injuries are currently under investigation. Experimental results have verified the exceptional performance of the proposed scheme.
hsa_circ_0139402 Promotes Bladder Cancer Progression by Regulating hsa-miR-326/PAX8 Signaling
Authors: Wei Bo , Wang Zunxian , Lian Qixin , Chi Baojin , Ma Shuxia
Published: February 2022

Background. Bladder cancer (BC) is a malignant and common malignant tumors. However, the prognosis of most patients with bladder cancer is still poor, and it is particularly important to identify early tumor diagnostic and treatment targets. Materials and Methods. High-throughput sequencing was used to evaluate the expression level of circRNA in bladder cancer tissue. MTT assay, wound healing assay, and transwell assay were used to detect the cancer cells’ proliferation, migration, and invasion affected by hsa_circ_0139402. The possible miRNA targets of hsa_circ_0139402 and downstream genes were detected by bioinformatics methods and dual-luciferase reporting experiment. FISH was used to observe their interaction. Results. High-throughput sequencing result showed that the expression of hsa_circ_0139402 was highest in BC tissues and increased in metastatic tissues compared to that of nonmetastatic tissues. MTT assay, wound healing assay, and transwell assay revealed that sh-hsa_circ_0139402 could suppress BC cells’ proliferation, invasion, and migration. Bioinformatics analysis, dual-luciferase reporter, and RIP assay showed that hsa_circ_0139402 can bind to hsa-miR-326, and PAX8 is a direct target of hsa-miR-326 in BC cell. Further, cytological studies found that hsa_circ_0139402 enhances BC cells’ proliferation, migration, and invasion by targeting PAX8 via hsa-miR-326. Conclusion. hsa_circ_0139402 plays a oncogene in BC and that can effectively promote cell proliferation, migration, invasion, and EMT by targeting Paired Box Protein Pax-8 (PAX8) via hsa-miR-326 and provides a potential therapeutic target for BC patients.
Rotating Hinge Prosthesis for Primary and Revision Knee Arthroplasty: Comparison and Indications
Authors: Neuhaus Hans-Joachim , Maier Kristin
Published: January 2022

Background. Rotating hinge knee prostheses are typically used in revision and severe primary total knee arthroplasty (TKA). For these challenging patient groups, currently only few studies with mid‐ or even long‐term follow‐up and adequate patient numbers are available. In addition, a more specific definition is needed of the indications for a rotating hinge prothesis in primary patients beyond the use in bone defects. Methods. In this prospective study, 170 primary and 62 revision TKA patients were included who received a rotating hinge knee prosthesis at the study centre between the years 2009 and 2014. Of these, 98 primary and 22 revision TKA patients were available for 5‐year functional and clinical follow‐up examinations. Prosthesis survival in both patient groups could be compared up to a 9‐year follow‐up. Results. Postoperatively, functional results including range of motion (ROM) and clinical scores like the Oxford Knee Score (OKS) and subscales of the Knee Society Score (KSS) improved better in patients treated for primary knee arthroplasty than for revision patients. Besides the patient group (primary vs. revision TKA), no overall influencing factors (age, body mass index, gender, etc.) regarding functional results could be identified in a multiple linear regression analysis. The revision rate of primary patients was significantly lower than in the revision patients, with an 8‐year Kaplan‐Meier prosthesis survival of 88% in the Primary and 60% in the Revision group. Conclusion. The prosthesis provides promising results in severe primary and revision knee arthroplasty. In addition to commonly agreed recommendations regarding the use of rotating hinge knee prostheses for primary surgery, six specific indications are proposed and discussed here as a base for scientific debate.
African Rigorous Innovative Stroke Epidemiological Surveillance: Protocol for a Community-Based Mobile-Health Study
Authors: Popoola Oluwafemi , Ovbiagele Bruce , Arulogun Oyedunni , Akinyemi Joshua , Akinyemi Rufus , Uvere Ezinne , Akpa Onoja , Salami Ayodeji , Taiwo Olalekan , Olaniyan Olanrewaju , Walker Richard , Jenkins Carolyn , Owolabi Mayowa
Published: February 2022

Despite projections of stroke being a leading cause of mortality in Africa, reliable estimates of stroke burden on the continent using rigorous methods are not available. We aimed to implement a mobile-Health community-based interactive Stroke Information and Surveillance System to sustainably measure stroke burden and improve stroke health literacy and outcomes in urban and rural sites in Nigeria. African Rigorous Innovative Stroke Epidemiological Surveillance (ARISES) is an observational cohort study, which will be conducted in urban (Ibadan North LGA Ward 3) and rural (Ibarapa Central LGA) sites with a combined base population of over 80,000 people. The study will use a consultative approach to establish an mHealth-based Stroke Information and Surveillance System comprising a Stroke Alert System and a Stroke Finding System. These systems will enable the community to report stroke events and the research team/health workers find stroke cases using phone calls, short message service, and Voice Over Internet Protocols (VoIP). We will update community household data and geo-locate all households. Over the 5 years of the study, the system will collect information on stroke events and educate the community about this disease. Reported stroke cases will be clinically adjudicated at home and in prespecified health facilities. Baseline and endline community surveys will be conducted to assess stroke occurrence and other important study variables. The proportion of strokes alerted and found will be determined over the study period. Focus group discussions and key informant interviews will be conducted to understand community stroke literacy and perspectives. The study will also assess any impact of these efforts on time from stroke onset to referral, community uptake of orthodox health services for stroke patients. ARISES is anticipated to establish proof of concept about using mHealth for stroke surveillance in Africa. The potential impact of the SISS on improving patient outcomes will also be determined.
Corticosterone and Adrenocorticotrophic Hormone Secretion Is Recovered after Immune Challenge or Acute Restraint Stress in Sepsis Survivor Animals
Authors: dos Santos-Junior Nilton Nascimento , da Costa Luis Henrique Angenendt , Catalão Carlos Henrique Rocha , Alves Rocha Maria José
Published: February 2022

Background: Clinical and experimental studies report a dysregulation of hypothalamus-pituitary-adrenal (HPA) axis during sepsis that causes impairment in hormone secretion in the late phase contributing for the pathophysiology of the disease. However, it is unclear whether this alteration persists even after the disease remission. Methods: We evaluated the effect of an immune challenge or restraint stress on the hormone secretion of HPA axis in sepsis survivor rats. Sepsis was induced by cecal ligation-puncture (CLP) surgery. Naive or animals that survive 5 or 10 days after CLP were submitted to lipopolysaccharide (LPS) injection or restraint stress. After 60 min, blood was collected for plasma nitrate, cytokines, adrenocorticotropic hormone (ACTH), and corticosterone (CORT) and brain for synaptophysin and hypothalamic cytokines. Results: Five days survivor animals showed increased plasma nitrate (p < 0.001) and interleukin (IL)-1β levels (p < 0.05) that were abolished in the 10 days survivors. In the hypothalamus of both survivors, the reverse was seen with IL-6 increased (p < 0.01), while IL-1β did not show any alteration. Synaptophysin expression was reduced in both survivors and did not change after any stimuli. Only the LPS administration increased plasma and/or inflammatory mediators levels in both groups (survivors and naive) being apparently lower in the survivors. There was no difference in the increased secretion pattern of ACTH and CORT observed in the naive and sepsis survivor animals submitted to immune challenge or restraint stress. Conclusion: We conclude that the HPA axis is already recovered soon after 5 days of sepsis induction responding with normal secretion of ACTH and CORT when required.
Salvage Radiotherapy for Recurrent Prostate Cancer after High-Intensity Focused Ultrasound Therapy: Quality of Life and Functional Outcome
Authors: Cafuta Barbara , Distler Florian A. , Wagner Annette , Pahernik Sascha , Albrecht Clemens , Hatiboglu Gencay
Published: February 2022

Introduction: The aim of this study was to evaluate toxicity, oncological and functional outcome, and quality of life after salvage radiotherapy for recurrent prostate cancer after high-intensity focused ultrasound (HIFU) therapy. Methods: A total of 13 patients undergoing salvage radiotherapy for biopsy-proven prostate cancer recurrence after HIFU therapy were included and followed up every 3 months. Oncological outcome (by PSA measurements), toxicity (according to CTCAE criteria), and functional outcome were evaluated. Quality of life was assessed by standardized questionnaires (QLQ-C30 and QLQ-PR25) at baseline, 3 months, and 12 months after salvage treatment. Results: Median age of patients was 80 years (interquartile range [IQR] 75–82). Patients underwent normofractionated salvage radiotherapy with median 73.6 Gy. PSA nadir was reached at 6 months and was 0.2 ng/mL. Median follow-up was 76 months (IQR 55–96). Biochemical recurrence occurred in 3 patients (23.1%) at a median of 36.4 months. No gastrointestinal (GI) or genitourinary (GU) toxicity ≥ grade 3 was noted during follow-up. Early and late grade II GI toxicity occurred in 1 patient (7.7%), respectively. GU toxicity grade II was noted in up to 53.8% at 3 months and 61.5% at 12 months. In terms of health-related quality of life, there was no statistically significant difference at 3 and 12 months compared to the baseline. Only differences were seen in sexual functioning (3 and 12 months) and in diarrhea (3 months), affecting patients’ wellbeing. Discussion/Conclusion: Salvage radiotherapy after HIFU treatment can be performed safely, thereby providing acceptable recurrence-free survival without severe impact on post-interventional quality of life.
Nota sobre a conservação de um púcaro cerâmico do sítio Ladeira da Barroquinha, Salavador, Bahia
Authors: Costa Carlos Alberto Santos , Etchevarne Carlos Alberto , Comerlato Fabiana , Mota Ritta Maria Morais Correia , Reis Silvana Santana , Santos Viviane da Silva
Published: February 2022

Neste artigo abordamos um púcaro inteiro que foi localizado nas escavações arqueológicas da Ladeira da Barroquinha, no centro histórico de Salvador, Bahia. O púcaro é uma peça rara, uma espécie de caneca cerâmica personalizada, de paredes muito finas (3mm) e produção refinada, utilizada no Brasil pelas classes mais abastadas do período colonial. Demonstramos a inserção institucional de realização das atividades, os diferentes agentes que participaram desse processo e os contextos histórico e arqueológico, além da contextualização socioeconômica e das ações de conservação no recipiente.
Identidade, Estado-nação e patrimônio: o tombamento do Parc National Historique no Haiti (1940-1990)
Authors: Louis Loudmia Amicia Pierre , Uhle Ana Rita
Published: February 2022

Sabendo que o Haiti liderou a única revolução levada a cabo por negros escravizados que pôs fim ao sistema colonial escravocrata e racista na ilha, dando lugar à primeira República negra do mundo, nos perguntamos sobre a constituição da sua identidade nacional e sua  materialização nos patrimônios históricos. Assim, este artigo analisa os processos de preservação do patrimônio haitiano entre as décadas de 1940 e 1990 – período de  institucionalização e tombamento dos primeiros monumentos históricos nacionais – identificando as circunstâncias que levaram ao surgimento e à implantação da questão como tema politicamente relevante. Analisaremos o período pós-independência relacionado à edificação das fortalezas que constituem o Parc National Historique – Citadelle Laferrière, Sans-Souci, Ramiers (PNH-CSSR), patrimônio cultural da humanidade e patrimônio nacional, – na tentativa de descobrir uma possível difusão de uma consciência do patrimônio nacional e desvendar as bases sobre as quais se ergueu a identidade nacional e como foram constituídas as políticas culturais no Haiti independente.
O Legislador e sua Autoridade que Nada É
Authors: Moyses Julio Soriano
Published: February 2022

Neste artigo, pretendo discorrer sobre um tema espinhoso do Contrato Social, de Jean-Jacques Rousseau, qual seja, o Legislador e sua autoridade que nada é. A atividade do legislador e a matéria da legislação se referem à instituição da sociedade civil, da “máquina” política e de suas engrenagens, bem como dos limites de sua ação. Sob esse aspecto, o objeto sobre o qual a legislação se debruça com o fito de bem ordená-lo é o espaço comum habitado e vivificado pela ação dos homens. Entrementes, o trabalho do Legislador na medida em que cria os mecanismos próprios da política, definidos pelo pacto social, lega aos cidadãos, como sua herança, os princípios do direito político, ou seja, essa figura exemplar engendra uma ciência política
AN EDUCATIONAL EXPERIMENT INTO HOW TO BRING DISCIPLINE CONCEPTS INTO PLAY: HOW A THEORETICAL PROBLEM ACTS AS A SOURCE OF TEACHER DEVELOPMENT
Authors: Fleer Marilyn
Published: February 2022

Relevant to the development of cultural-historical theory is the contemporary understanding that teacher development was never the focus of Vygotsky’s research. Yet researchers who are studying teacher professional development have increasingly drawn on concepts from cultural-historical theory. Concepts relevant to child development are being used to explain how teachers in schools (Edwards et al., 2019; Ellis, 2007) and preschools (Nuttall et al., 2015) are developing their professional practices. But the question of what is developing for teachers remains unanswered. Th e goal of this paper is to present a study of teacher development over two years. Th e method was an educational experiment (Hedegaard, 2008) where teachers and researchers collaborated on a theoretical problem of how to bring into their play programs discipline concepts. Th e data gathered for the educational experiment included 152 hours of digital video recordings of practices, planning documentation, and 32 hours of weekly interviews. Th e sample included two early childhood teachers over two years from two classrooms. Th e Vygotskian concepts of crisis and Hedegaard’s dialectical concepts of motives and motivation were used to analyze the data. Th e results show how the ongoing small crises experienced over time, when successfully resolved, bring developmental conditions for teachers. Th e conclusion was that development could be theorized as a change in teacher positioning as an outsider of children’s play, to a play position which brought forward a change in teacher motives.
Calculation of Band Alignment and Interfacial Recombination in CZTS-Based Solar Cell
Authors: Liu Huimin , Guo Jie , Hao Ruiting , Liu Bin , Sun Shuaihui , Wei Guoshuai , Ma Xiaole , Li Xiaoming , Fang Shuiliu , Wang Yunpeng
Published: January 2022

SCAPS software as a simulation tool was applied to investigate the photovoltaic performance of Cu2Zn4SnS4 (CZTS) thin film solar cells. Firstly, the influence of the work function of back contact on the open circuit voltage (Voc) and efficiency
was studied, which increased with the work function and reached the maximum at 5.2 eV. The variation of the efficiency with the conduction band offset (CBO) at CZTS/CdS interface was discussed. The high efficiency of 12% can be obtained when CBO value changed from −0.1 to 0.2 eV, which
means a little cliff-like or spike-like band alignment at the CZTS/CdS interface. Under a large spikelike CBO, the efficiency sharply declined because of the large barrier blocking the photo-generated carriers. Furthermore, the recombination and optical electronic characteristics were researched
through the insertion of an intermediate layer at absorber/back contact and buffer/absorber interfaces. With the carrier concentration in p+-CZTS intermediate layer inserted at CZTS/Mo interface increasing from 1015 to 1018 cm−3, the Voc
increased from 0.736 V to 0.850 V which promoted the efficiency from 12.03% to 15.60%. By inserting a low doped p-CZTS intermediate layer at CZTS/CdS interface, the efficiency achieved to 17.31%, which is attributed to the low recombination. At the concentration greater than 1017
cm−3, the close concentration of electron and hole resulted in the large recombination and inferior performance. The research scheme used in this paper is significant for CZTS-based or other photovoltaic solar cells.
Analysis of Dilatation Waves Propagation in an Irregular Single-Walled Carbon Nanotube Under Initially Stresses
Authors: Selim Mahmoud M. , Mousa Awad
Published: January 2022

This article studies the propagation of dilatation waves in an initially stresses single-walled carbon nanotube (SWCNT) with surface irregularity using Donnell thin shell approach. Taking into account the effects of surface irregularity and initial stresses, propagation of dilatation
waves is studied and dispersion curves are plotted for in several figures. The effects of surface irregularity and initial stresses are confirmed by comparing obtained numerical results with those in cases of uniform and initial stress-free SWCNT. Obtained results turn out that, the increase
of surface irregularity parameter increases the natural frequency of dilatation waves, while the increase of the initial stress parameter decreases the natural frequency of dilatation wave propagating in the single-walled carbon nanotube. To the author best knowledge, effects of surface irregularity
and initial stresses on the dilatation waves propagation in a single-walled carbon nanotube has not yet been done before. The previous studies were devoted to the uniform and initial stresses-free carbon nanotubes. It should be emphasized that the dilatation waves propagating in a pre-stressed
irregular single-walled carbon nanotube is novel, workable, and at the beginning of the path. In this manner, understanding the influences of surface irregularity as well as initial stresses on the natural frequency of dilatation waves may serve as useful references for the applications and
designs of nano oscillators and nanodevices, in which single-walled carbon nanotubes act as the most prevalent nanocomposite structural element.
Construction of N-Doped Hollow Carbon Nanospheres Through a Novel Self-Template Strategy as High-Performance Electrode Materials for Supercapacitors
Authors: Zhao Xiang , Zhang Mu , Pan Wei , Yang Rui , Sun Xu-Dong
Published: January 2022

N-doped hollow carbon nanospheres (NHCSs) with mesopores-rich hierarchical structure have been synthesized by a self-template strategy using resorcinol-formaldehyde resin as precursors. The crucial point of this strategy is the selective dissolution of acetones for oligomers
and subsequent rearrangement dependent on the structure-directing agent (CTAB). The large specific surface area (1325.0 m2 g−1), abundant and accessible mesopores (6.6 nm), unexpected nitrogen doping concentration (3.5 wt.%), and favorable graphitization (0.88),
enable the as-prepared NHCSs to be a candidate for energy storage materials. When utilized as supercapacitor electrode, the NHCSs exhibit high specific capacitance of 293.1 F g−1 at 0.5 A g−1, impressive rate performance of 225.0 F g−1 at
20 A g−1, and good cycling performance (over 88.24% the peak capacity was retained after 5000 cycles at 5 A g−1). The self-template strategy displays potential prospects as a versatile route to reconstruct porous structures of carbon materials from phenolic
resin polymers, thereby broadening the applications in drug delivery, adsorption, and energy storage systems.
Study on the Propagation Characteristics of Partial Discharge Electromagnetic Waves in Gas Insulated Line
Authors: Li Lu , Zhang Wei-Zheng , Zhang Jia-Tao , Qu Xin , Peng Qi , Hu Run-Ge
Published: January 2022

Defects in the gas insulated line can cause partial discharge, and the electromagnetic wave is generated. The finite difference time domain method is used to research the propagation of electromagnetic wave in gas insulated line structures. The electric field strength of time-domain
waveform is selected as characteristic factor for analysis. By changing the gas insulated line model, the attenuation of electromagnetic wave through double insulator, L-type corner, T-type corner, straight tube and different GIL sizes is studied. In the straight tube structure, the amplitude
attenuation of electromagnetic wave is linear and the attenuation band is between 1 GHz and 1.7 GHz. In the insulator, basin insulator has more serious influence on signal isolation than disc insulator. After passing through the insulator, the signal attenuation is obvious in the frequency
band above 1 GHz. The amplitude of electromagnetic wave decreases more seriously through the corner structure, and the attenuation is at the whole frequency band. In different sizes of gas insulated line, the larger diameters of shell and conductor, the larger electromagnetic wave will be,
and the faster attenuation will be; the length of gas insulated line cavity has little effect on electromagnetic wave. The theoretical research is expected to help to arrange the position of ultra-high frequency sensor reasonably.
Photon-Assisted Average Current Through a Quantum Dot Coupled to Majorana Bound States
Authors: Chi Feng , He Tian-Yu , Zhou Guofu
Published: January 2022

We investigate the properties of photon-assisted current through a quantum dot (QD) coupled to two leads and Majorana bound states (MBSs) formed at two ends of a topological superconductor nanowire. Our numerical results show that the peak’s height of the average current is reduced
to half by the half fermionic character of MBSs. When a microwave (MW) field is applied on one of the leads, the negative current is converted into positive by the MBSs. This abnormal phenomenon may serve as a detection method for MBSs. Moreover, the photon-assisted tunneling sideband peak
appears while a MW field is applied on the QD. Turning on the coupling between the QD and MBSs, the magnitude of the average current decreases monotonously because that the MBSs now is changed to the non-zero energy mode by emitting (absorbing) photons from the MW field. Correspondingly, the
energy level in the QD is split into two by the non-zero energy mode MBSs, and then the photon-assisted tunneling occurs with the help of the MBSs.
Design of Novel Optical Fiber Communication Electronic System and Big Data Prediction Method of Its Loss
Authors: Zhou Shuyu
Published: January 2022

For the shortcomings of traditional data communication electronic mode and bus interface, optical fiber communication electronic technology and compact peripheral component interconnect (CPCI) bus interface mode with industry standard are adopted to design a kind of optical fiber communication
electronic data transmission mode. The optical fiber communication electronic board based on CPCI bus constitutes a novel optical fiber communication electronic system. In the process of hardware design, the small form-factor pluggable (SFP) transceiver module is used to convert the photoelectric
signal and complete the transmission of optical fiber data. Regarding the existence of differential signal in high-speed serial circuit of electronic board, the wiring is reasonably arranged. The hardware test platform of optical fiber communication electronic system is built based on PCI9054
CPCI bus and industrial personal computer (IPC) communication electronics. FPGA with embedded high-speed serial transceiver module is adopted to design the hardware logic function. Binary gray code is used to count. FIFO protocol and Aurora protocol are supported. Protocol IP core is customized
to realize the full duplex electronic communication of high-speed data. Considering the loss problem of the system, the grey model GM(1, 1), ARIMA model and Elman neural network are employed as the big data level research scheme, which are combined into the loss prediction model according
to a certain proportion. In the experiment, the test of DMA data reading and writing function is designed, and the embedded highspeed transceiver module and optical fiber communication electronic logic function are simulated. The results show that the symbol error rate (SER) is always 0, and
the low-pass filtering characteristics of the channel are effectively compensated, which makes the signal quality stabler. Compared with the single big data level research scheme, the combined model has smaller prediction error and higher prediction accuracy.
Hand-Eye Calibration Technology of Intelligent Picking Robot Using Multiple Photoelectric Sensor Information Fusion
Authors: Chen Linlin , Huang Ju , Liu Yonghua
Published: January 2022

Multiple photoelectric sensors are designed for information fusion, in order to restrict the movement of robot end-effecter and camera, and then construct the hand-eye equation to obtain the corresponding hand-eye pose. First, the mathematical model of hand-eye calibration (HEC) is
studied; moreover, the control system based on multiple photoelectric sensors with NImyRIO-1900 microprocessor as the core is designed. Its upper layer includes infrared sensor, acoustic photoelectric sensor, and gas photoelectric sensor, which can collect the position characteristics of the
robot; finally, an automatic HEC system (HECS) is designed based on the control. The system combines the control system composed of multiple photoelectric sensors and the HEC method. It can collect data in real time, expand the camera field of vision, and improve the efficiency of HEC. When
the calibration result reaches the predetermined accuracy, the HECS is terminated. In the experiment, the control system based on multiple photoelectric sensors helps the automatic calibration system to complete the picking task within 15 minutes. The success rate of pose planning of the end-effector
of the system is 85%, the calibration attitude error is only 0.0586, and the position error is only 12.6685 mm, which verifies that the calibration system based on multiple photoelectric sensors is effective.
Preparation of Anticorrosive Coating with No Solvent for Repairing
Authors: Yang Zhou , Chen Qing-Guo , Wang Xin-Rui , Zhang Xiao-Man , Chi Ming-He
Published: January 2022

The solvent-free fast-curing coating for repairing is prepared using polyurea as matrix and graphite nanoplatelets (GNPs) as fillers. The effects of GNPs on the coating are studied. The coating is prepared by HDI tripolymer and polyetheramine. The GNPs is functionalized (f-GNPs) by
aminopro-pyltriethoxysilane (APTES) in mixture of water and ethanol. The performances of the coatings are tested by salt spray time, polarization curves and electrochemical impedance. The coating presents solvent-free and fast-curing characteristics and is suitable for repairing. The f-GNPs
provide both physical barrier and coulomb block for the coating. When the f-GNPs added amount is 0.6 wt%, the salt spray resistance time of the coating is more than 420 h, and the corrosion potential is –0.6428 V. The effects of GNPs on coating are investigated. The results can provide
a new idea for preparation of anticorrosive coating used for repairing, and can benefit in-depth understanding of the influence of f-GNPs on the coatings. The coating for repairing is prepared by adding f-GNP as fillers. The anticorrosive mechanism and performance of the coating are discussed
in detail.
The Association of Arterial Stiffness With Significant Carotid Atherosclerosis and Carotid Plaque Vulnerability
Authors: Kadoglou Nikolaos P.E. , Moulakakis Konstantinos G. , Mantas George , Kakisis John D. , Mylonas Spyridon N , Valsami Georgia , Liapis Christos D
Published: January 2022

Arterial stiffness and its valid index, the cardio-ankle vascular index (CAVI), have emerged as predictors of adverse cardiovascular outcomes. We investigated the relationship of the CAVI with significant carotid stenosis (> 50%) and the related cerebrovascular symptoms or carotid plaque echogenicity, assessed by ultrasound gray-scale median (GSM) score, at baseline and after carotid artery stenting (CAS). We prospectively enrolled 113 patients with carotid stenosis (70-99% for asymptomatic and > 50% for symptomatic participants) eligible for CAS. Age- and sex-matched individuals (n = 38) served as controls (CON). Clinical data, CAVI, and biochemical profile were obtained at baseline. Clinical assessment and CAVI measurement were performed 6 months after CAS. Compared with the CON group, the CAS group had a higher incidence of co-morbidities (diabetes, hypertension, and hyperlipidemia), higher CAVI values (9.94 ± 2.14 vs 7.85 ± .97 m/sec, P < .001), but a better lipid profile due to increased prescription of statins. The symptomatic CAS subgroup showed higher CAVI ( P < .001), high-sensitivity C-reactive protein ( P = .048), and osteoprotegerin ( P = .002) levels than the asymptomatic one. In multivariate analysis, CAVI at baseline was independently associated with the presence of significant carotid atherosclerosis (β = .695, P < .001), cerebrovascular events (β = .474, P < .001), and GSM score (β = −.275, P = .042). Raised CAVI values were independently associated with significant carotid stenosis and plaque vulnerability.
A Population-Level Study Concerning the Assumed Association Between Suicide Rates and Antidepressant Consumption in Hungary
Authors: Bozsonyi Károly , Lester David , Zonda Tamás , Bálint Lajos , Veres Előd
Published: January 2022

Background

It has been claimed that the advent of modern antidepressants has reduced the suicide rate.

Aims

To examine the correlation between the suicide rate and the prescription of antidepressants.

Method

A dynamic regression was employed to analyze a 73-month-long, monthly time series between 2010 and 2016 in Hungary. The independent variable was the Defined Daily Dose value for the number of antidepressant (AD) prescriptions filled each month.

Results

The models failed to show a significant association between the prescription of antidepressants and age- and sex-specific monthly suicide rates.

Conclusions

The prescription of antidepressants in Hungary has had no impact on suicide rates.
Can Regulatory Fit Improve Elementary School Students’ Performance? Effects of Different Types of Regulatory Fit
Authors: Miwa Shuhei , Nagamine Masato , Tang Li , Xiao Yuzhi , Toyama Miki
Published: January 2022

Previous studies have demonstrated the effect of regulatory fit on Japanese elementary school students (aged 9–12 years). The hypotheses were that promotion focused students tend to show good performance related to speed when they use an eager manner; on the other hand, prevention focused students tend to show good performance related to accuracy when they use a vigilant manner. In Study 1, the class teacher assessed their student’s regulatory focus and then manipulated the students’ manner of solving a calculation task by asking the students to engage speedily so that they solve many tasks in eager manner condition, or accurately so that they can avoid making errors in the vigilant manner condition. The results indicated that students with a promotion focus tended to solve more tasks in the eager manner condition. In addition, the same result was replicated in Study 2. These combined results suggest that regulatory fit is experienced not only by adults but also by young children. Moreover, the influence of regulatory fit depended on the type of regulatory fit. It is suggested that regulatory fit theory could be applied to educational settings to efficiently enhance the performance of students.
Women and the Changing Nature of Work in Hyderabad’s HITEC City
Authors: Pradhan Ipsita , Mukherjee Anushyama , Rayaprol Aparna
Published: January 2022

This article will look at the ways in which gendered work is being transformed in contemporary India by focussing on Hyderabad, the capital of Telangana. Since the mid-1990s, after India opened its doors to multinational agencies, new forms of gendered labour have manifested. One of the ramifications of this gendered process is the feminisation of labour that enabled the participation of more women in the work force, engaging in activities that were low-paid. The basis of feminisation is that certain jobs require fewer skills or particular kinds of skills, for which women are thought to be suitable. This also has implications for the low bargaining power of women workers. The feminisation of the labour force in HITEC city, Hyderabad is a consequence of the changing labour markets with globalisation, offshore factories, migration and other changes in the workplace.