bluuebunny/crossref_metadata_2025_split huggingface dataset:
Accumulation of Essential Mineral and Toxic Trace Elements in Crops and Soils of Vegetable Cropping Systems in Central Highlands of Sri Lanka
Authors: Suriyagoda Lalith , Dissanayake Ovini , Kodithuwakku Virashmi , Maduwanthi Isuri , Dissanayaka Nuwandhya , Chandrajith Rohana 
Published: July 2021

Abstract
Background and Aims Vegetables are widely cultivated in high rainfall and mountainous regions in Sri Lanka with poor soil conservation practices. Accumulation of essential mineral and toxic trace elements in these soils and widely cultivated vegetable crops are not known. Methods One hundred soil and vegetable (i.e. cabbage, carrot and potato) samples were collected at the time of harvest and analysed for element concentrations. Key Results Soils contained very high concentrations of essential mineral and toxic trace elements. When compare edible parts, cabbage contained the highest concentrations of mineral and toxic trace elements, and potato contained lowest. Irrespective of the crop, edible parts contained high concentrations of N, P, K, (14-35, 2-6, 15-24 g kg−1, respectively), Cu, Zn, Mn (2.5-6.7, 11-30, 8-147 mg kg−1, respectively). Vegetables also contained As, Cd and Pb (0.04-1, 0.02-0.15, 0.02-0.26 mg kg−1, respectively), but didn’t exceed the maximum permissible limits. Irrespective of the crop 36-64 kg N, 6-11 kg of P, 35-45 kg K per ha were removed with the harvest. According to the current rate of vegetable consumption by a Sri Lankan adult (i.e. 240 g FW per day), per capita consumption of 0.05-0.2 mg Cu, 0.45-0.65 mg Zn and 0.5-2 mg Mn day−1through these vegetables was observed, i.e. 5-23% Cu, 7.5-11% Zn and 22-87% Mn of the recommended daily intake. Conclusion Vegetables grown in the region served as a key source of essential mineral elements. However, agronomic mitigation strategies are needed to improve soil health and sustainability of these cropping systems.
Predicting Required COVID-19 Vaccine Coverage and its Impact in Sierra Leone Using Mathematical models
Authors: Kamara Joseph A. L. , Kamara Abdul A. , Samura Sallieu K. 
Published: July 2021

Abstract
In this article, we predict the required vaccine coverage to eradicate the COVID-19 outbreak in Sierra Leone. We also, investigate the impact of facemask and vaccine coverage on the spread of the COVID-19 virus using a modified symptomatic-asymptomatic infection transmissions Susceptible-Latent-Infectious-Asymptomatic-Recovered (SLIAR) model. We derived an explicit formula for the basic reproduction number and used it to understand the dynamics of the disease when it is greater than unity. We also used Maximum Likelihood modelling technique to estimate the basic reproduction number using incidence data. Numerically, we show that 58 per cent of the Sierra Leone national population required vaccination to eradicate the COVID-19 virus. Also, the SLIAR with vaccine model results reveal that the impact of using facemask is very challenging to understand and the vaccine coverage decrease the infected transmission rate but cannot completely eradicate the infection.
Effect Analysis of a Virtual Simulation Experimental Platform in Teaching Pulpotomy
Authors: Lu Jiaxuan , Yang Xin , Zhao Wei , Lin Jiacheng 
Published: July 2021

Abstract
Background: The experimental teaching of pediatric dentistry is a bridge between theoretical study and clinical practice, and virtual simulation technology provides a new way of instruction. Methods: We have built an experimental teaching platform using virtual simulation technology for vital pulpotomy that includes learning and examination modes. There were 199 students who were majoring in stomatology in the fourth year in Sun Yat-Sen University randomly divided into a control group (conventional teaching mode) and an experimental group (virtual simulation experimental teaching model). The teaching effect was evaluated by theoretical and experimental examination. Results: We found that the theoretical and experimental scores of the experimental group were both higher than those of the control group, and the theoretical scores of the experimental group after exposure to the virtual simulation experimental teaching platform were also higher than those before the class. The differences were statistically significant (P < 0. 05). Feedback from the experimental group after the class indicated that the platform reinforced their theoretical knowledge and greatly improved their mastery of operational skills. Conclusions: The application of a virtual simulation experimental teaching platform can effectively improve teaching pulpotomy.
Iron-doped Calcium Phytate Nanoparticles as a Bio-responsive Contrast Agent in 1H/31P Magnetic Resonance Imaging
Authors: Ziółkowska Natalia , Vít Martin , Laga Richard , Jirák Daniel 
Published: July 2021

Abstract
We present the MR properties of a novel bio-responsive phosphorus probe doped with iron for dual proton and phosphorus magnetic resonance imaging (1H/31P-MRI), which provide simultaneously complementary information. The probes consist of non-toxic biodegradable calcium phytate (CaIP6) nanoparticles doped with different amounts of cleavable paramagnetic Fe3+ ions. Phosphorus atoms in the phytate structure delivered an efficient 31P-MR signal, with iron ions altering MR contrast for both 1H and 31P-MR. The coordinated paramagnetic Fe3+ ions also broadened the 31P-MR signal spectral line due to the short T2 relaxation time, making it undetectable at higher concentrations. However, when Fe3+ was decomplexed from the probe, relaxation times were prolonged. As a result, 1H-MR contrast changes as well as the 31P-MR signal increase. These 1H and 31P-MR dual signals triggered by iron decomplexation may have been attributable to biochemical changes in the environment with strong iron chelators, such as bacterial siderophore (deferoxamine). Analysing MR signal alternations as a proof-of-principle on a phantom at a 4.7 T magnetic field, we found that iron presence influenced 1H and 31P signals and signal recovery via iron chelation using deferoxamine.
Human Adipose-derived Mesenchymal Stem Cells-Derived Exosomes Encapsulated in Pluronic F127 Hydrogel Promote Wound Healing and Regeneration
Authors: Zhou Yang , Zhang Xin-Liao , Zhang Hai-Jun , Lu Yi-Jun , Lu Shou-Tao , Zhao Bo , Zhang Ning-Yan , Zhang Jing , Zhang Jun 
Published: July 2021

Abstract
Background: Large area skin trauma has always been a great challenge for both patients and clinicians. Exosomes originated from human adipose-derived mesenchymal stem cells (hADSCs) have been a novel promising cell-free treatment in cutaneous damage repair. Nevertheless, the low retention rate of exosomes post-transplantation in vivo remains a significant challenge in clinical applications. Herein, we purposed to explore the potential clinical application roles of hADSCs-Exos encapsulated in functional PF-127 hydrogel in wound healing.Methods: hADSCs-Exos were isolated from human hADSCs by ultracentrifugation. An injectable, biocompatible, and thermo-sensitive hydrogel Pluronic F-127 hydrogel was employed to encapsulate allogeneic hADSCs-Exos, and this complex was topically applied to a full-thickness cutaneous wound in mice. On different days post-transplantation, the mice were sacrificed, and the skin tissue was excised for histological and immunohistochemical analysis.Results: PF-127/hADSCs-Exos complex enhanced skin wound healing, promoted re-epithelialization, increased expression of Ki67, α-SMA, and CD31, facilitated collagen synthesis (Collagen I, Collagen III), reduced inflammation (IL-6, TNF-α, CD68, CD206), and up-regulated expression of skin barrier proteins (KRT1, AQP3). The results showed that both PF-127/hADSCs-Exos and hADSCs-Exos could improve the cwound healing process at a similar level.Conclusion: PF-127/hADSCs-Exos combination can maintain the bioactivity of hADSCs-Exos and control the exosome release. The low-frequency administration of PF-127/hADSCs-Exos could promote cutaneous wound healing instead of the high-frequency administration of pure exosomes. Thus, this biomaterial-based exosome will be a promising treatment approach for the cutaneous rejuvenation of skin wounds.
High Sensitive, Linear and Thermostable Pressure Sensor Utilizing Bipolar Junction Transistor for 5 kPa
Authors: Basov Mikhail 
Published: July 2021

Abstract
Research of pressure sensor chip utilizing novel electrical circuit with bipolar-junction transistor-based (BJT) piezosensitive differential amplifier with negative feedback loop (PDA-NFL) for 5 kPa differential range was done. The significant advantages of developed chip PDA-NFL in the comparative analysis of advanced pressure sensor analogs, which are using the Wheatstone piezoresistive bridge, are clearly shown. The experimental results prove that pressure sensor chip PDA-NFL with 4.0x4.0 mm2 chip area has sensitivity S = 11.2 ± 1.8 mV/V/kPa with nonlinearity of 2KNLback = 0.11 ± 0.09 %/FS (pressure is applied from the back chip side) and 2KNLtop = 0.18 ± 0.09 %/FS (pressure is applied from the top chip side). All temperature characteristics have low errors, because the precision elements balance of PDA-NFL electric circuit was used. Additionally, the burst pressure is 80 times higher than the working range
Modeling of sensitive element for pressure sensor based on bipolar piezotransistor
Authors: Basov Mikhail , Prigodskiy Denis 
Published: July 2021

Abstract
The paper describes modeling of high-sensitivity MEMS pressure sensor based on a circuit containing both active and passive stress-sensitive elements: a differential amplifier utilizing two n-p-n transistors and four p-type piezoresistors. The analysis on the basis of the developed mathematical model for a pressure sensor with traditional piezoresistive Wheatstone bridge and theoretical conclusions regarding the change in the electrical parameters of a bipolar transistor under the influence of deformation was carried out.
Development of an Internet of Things (IoT) Enable Smart Parking System for Sri Lanka
Authors: Maduranga H.D.D. , Imendra K.G.T.U. , Prematilake R.D.D. , Samarasekara S.D. , Wanninayake R.B.S. , Perera A. 
Published: July 2021

Abstract
Although the smart parking system is not a new concept for Sri Lankans, the idea of booking parking slots in advance and then parking is a novice theme for our country. So, we decided to see that novice theme as a new opportunity and used this concept for our study title, As the first phase of the study, we agreed to design a remote reservation parking system for a public parking area. We designed an online parking reservation mobile application system that shows the available free parking slots to the users where the users can reserve a parking slot for any time they want. IoT-enabled mobile app technology was used to develop the system. Results show promising results applying such a system to local parking stations in Sri Lanka.
Low Grade Appendiceal Mucinous Neoplasms- A Short Case Series with Review of Literature
Authors: Salapathi S , Rajeshwari B , Niamath Sadiya , Ghosh Mitra 
Published: July 2021

Low-grade appendiceal mucinous neoplasm (LAMN) is a rare malignancy and is found in less than 0.3% of appendectomy specimens. Patients with LAMN can present with abdominal pain and mimic clinically as appendicitis, intussusception or obstruction, hence high clinical suspicion is needed for correct diagnosis and management. The exact nature and nomenclature of these tumors when they disseminate into the peritoneum is controversial. The prognosis of LAMN is highly dependent on the presence or absence of neoplastic epithelium outside the appendix. Tumors with extra appendiceal acellular mucin in the right lower quadrant only rarely recur but tumors with extra appendiceal mucin and neoplastic epithelium recur more often. LAMNs with diffuse peritoneal seeding of neoplastic epithelium and mucin have a progressive clinical course that frequently results in death of the patient. Hence whenever a case of mucinous neoplasm of the appendix is encountered, it is essential that the entire appendix be submitted for histopathologic examination and should be thoroughly evaluated for presence of extra appendiceal mucin and neoplastic epithelium, and also for the type of invasion in order to obtain the correct diagnosis and to predict the risk of recurrence. We present here three cases of low grade appendiceal tumors with their varied clinical presentation and histopathological findings, for their rarity and clinical importance.
A feature extraction method based on the entropy-minimal description length principle and GBDT for common surface water pollution identification
Authors: Huang Pingjie , Wang Lixiang , Hou Dibo , Lin Wangli , Yu Jie , Zhang Guangxin , Zhang Hongjian 
Published: July 2021

Abstract
To effectively prevent river water pollution, water quality monitoring is necessary. However, existing methods for water quality assessment are limited in terms of the characterization of water quality conditions, and few researchers have been able to focus on feature extraction methods relative to water pollution identification, or to obtain accurate water pollution source information. Thus, this study proposed a feature extraction method based on the entropy-minimal description length principle and gradient boosting decision tree (GBDT) algorithm for identifying the type of surface water pollution in consideration of the distribution characteristics and intrinsic association of conventional water quality indicators. To improve the robustness to noise, we constructed the coarse-grained discretization features of each water quality index based on information entropy. The nonlinear correlation between water quality indexes and pollution classes was excavated by the GBDT algorithm, which was utilized to acquire tree transformed features. Water samples collected by a southern city Environmental Monitoring Center were used to test the performance of the proposed algorithm. Experimental results demonstrate that features extracted by the proposed method are more effective than the water quality indicators without feature engineering and features extracted by the principal component analysis algorithm.
Perceptions of water quality, and current and future water consumption of residents in the central business district of Yangon city Myanmar
Authors: Ko Shane Htet , Sakai Hiroshi 
Published: July 2021

Abstract
Public water supply services in Yangon started in 1842, however the practice of drinking tap water has been uncommon until this moment. Currently, Yangon city development committee is upgrading the tap water system in accordance with the greater Yangon water supply improvement project. It is important to know the perceptual driving factors affecting the decision to drink in order to effectively improve the public acceptance of tap water. In this study, household water management practices and their influencing factors for Yangon city residents are revealed through questionnaires. Residence time in Yangon city is significantly associated with water consumption behaviour. Decisions for drinking come from organoleptic perception rather than important safety considerations. The future consumption of tap water is influenced by income and perception of overall quality. Preferred billing method is associated with education, family size, income and willingness to spend more for better quality water.
Estimating effluent turbidity in the drinking water flocculation process with an improved random forest model
Authors: Wang Dongsheng , Chang Xiao , Ma Kaiwei , Li Zhixuan , Deng Lianqing 
Published: July 2021

AbstractDuring drinking water treatment, the uncertain changes of raw water quality bring great difficulties to the control of flocculant dosage, especially because the feedback information based on the effluent turbidimeter of the sedimentation tank can only be obtained after a long time when the influent water quality changes due to the large lag characteristics of the flocculation process. Prediction of effluent turbidity of the sedimentation tank can effectively solve the aforementioned problem. Given that it is difficult for the ordinary random forest (RF) model to accurately predict the effluent turbidity of a sedimentation tank for complicated changes of raw water quality, an improved random forest (IRF) model composed of long-term and short-term parts is proposed, which can capture the periodicity and time-varying characteristics of influent water quality data. The experimental results show that the root mean square error and mean absolute percentage error of IRF model in Baiyangwan waterworks are improved 67.52% and 67.91% respectively, compared with those of the ordinary RF model. The proposed effluent turbidity predictions are also successfully developed in Xujiang waterworks and Xiangcheng waterworks of Suzhou, China. This research provides an effective method for real-time prediction of the effluent turbidity of sedimentation tank according to the influent water quality data.
An appraisal of nutrient status and productivity with emphasis on phytoplankton assemblage in Karamana River, Kerala, India
Authors: Mohan Nivedi S. , M. K. Vishnu Sagar , Joseph Sabu 
Published: July 2021

Abstract
Nutrient pollution of rivers is one of the prime threats facing the aquatic systems. In the present study, water samples (n = 20) were collected from the Karamana river (KR) during the pre-monsoon (PMN) and monsoon (MN) seasons of 2019 to analyze the seasonal variations. The water samples were analyzed for various physico-chemical parameters and to understand the nutrient status of the river. Furthermore, gross primary productivity (GPP), net primary productivity (NPP) and phytoplankton analysis were carried out to assess relationship among productivity variables and phytoplanktons. The study revealed that water quality is better during MN than PMN due to dilution. Among the two seasons, PMN showed relatively higher values for most of parameters like pH, EC, TDS, TA, Cl, NH4-N, NO3-N, NO2-N, Chl-a, GPP and NPP. The correlation among GPP, NPP, nutrients and other water quality parameters were done using SPSS. Phytoplankton of 23 genera belonging to three classes, namely Chlorophyceae (40%), Bacillariophyceae (40%) and Cyanophyceae (20%) have been identified in KR. The various phytoplankton diversity indices and statistical analyses were estimated and their relevance discussed in this paper. The nutrient enrichment in the downstream regions was affected the phytoplanktonic structure and diversity of the river.
Interação escola e família mediada pela gestão escolar: um estudo de caso
Authors: Rescia Ana Paula Oliveira , Gentilini João Augusto 
Published: July 2021

O Brasil apresenta um contexto socioeconômico e político regido pelo sistema capitalista, engendrado por políticas neoliberais e pela globalização da economia que se refletem nas políticas públicas de atendimento às áreas social e educacional. O Estado é insuficiente para atender, com qualidade e quantidade, às necessidades educacionais da população, exigindo a criação de mecanismos institucionais que estimulem a participação dos atores sociais envolvidos com a educação. Nesse aspecto, a escola pode ter a sua gestão como meio facilitador para a transformação da realidade educacional, através do incentivo e do desenvolvimento de uma prática democrática e participativa. Este trabalho é resultado de uma pesquisa de Mestrado que investigou o processo de interação escola e família mediado pela gestão escolar sob uma perspectiva democrática e participativa através de estudo de caso numa escola pública, de ensino fundamental, da Rede de Ensino do Estado de São Paulo, localizada na cidade de Bauru – SP.

Abstract:
Brazil presents a socioeconomic and political context governed by the capitalist system, engendered by neoliberal politics and by the globalization of the economy that is reflected in public politics of assistance to the social and educational fields. The state is insufficient to afford, with quality and quantity, the educational needs of the population, requiring the creation of institutional mechanisms that encourage the participation of social actors involved with education. In this aspect, the school can have its management as a way for facilitating the transformation of the educational reality, and by encouraging the development of a participatory and democratic practice. This work is the result of a Masters search that investigated the process of school and family interaction mediated by the school management under a democratic and participatory approach through a studied case in a public school, primary school of the Education system of the State of Sao Paulo, located in the city of Bauru – SP.
Sao: sistemas de avaliação on-line em instituições educacionais.
Authors: Mazieiro Breno Vicente 
Published: July 2021

Este trabalho, em abordagem interdisciplinar, procura discutir contribuições de diferentes áreas do conhecimento para a fundamentação de aplicativos on-line que permita a coleta e o tratamento eletrônico de informações relevantes e confiáveis em projetos de avaliação institucional. Buscando referenciais teóricos nas áreas de gestão educacional, avaliação institucional e informática aplicada à gestão educacional. Em seguida, a partir dos referenciais estabelecidos, tratar do desenvolvimento de um aplicativo (software) de suporte à coleta eletrônica de dados, contendo, em seus diferentes módulos, rotinas para abordagens quantitativas e qualitativas na análise dos resultados que possam ser utilizadas em diferentes organizações, desde universidades até unidades escolares de Educação Básica. Estudo desenvolvido no âmbito do IAGE – Grupo de Pesquisa Informática Aplicada à Gestão Educacional, vinculado ao Programa de Pós-Graduação em Educação Escolar da Faculdade de Ciências e Letras da Unesp-Araraquara, que já desenvolveu instrumentos e procedimentos para avaliação de programas e projetos em escala.

Abstract:
This work, trough an interdisciplinary approach, aims to discuss contributions of different areas of knowledge by applying online methods that allow the collection and processing of relevant and reliable electronic information in projects of institutional assessment. We searched our theoretical references in the areas of educational management, institutional assessment and computing applied to educational management. Consequently, after being established our theoretical approach, we developed the application of a software to support the collection of electronic data, containing, in its various modules, quantitative and qualitative routines to the analysis of results that can be used in different organizations from universities to Basic Education. This study was carried out at IAGE-Group of Computing Research Applied to Management Education, linked to the Program for Post-Graduation of Unesp - Araraquara, which has developed tools and procedures for evaluation of programs and projects.
Um estudo acerca da formação do professor universitário.
Authors: Nunes Neusa Clementina Rosa , Souza Silvia Cristina de 
Published: July 2021

O objetivo do presente trabalho é tratar da questão da formação do professor universitário no Brasil e apresentar o estudo de uma realidade específica que pretendeu conhecer as concepções dos professores universitários sobre sua prática docente, quais eram suas demandas de formação e como, no entender desses professores, a instituição a que estavam ligados poderia promover o atendimento dessas necessidades de formação. Esse artigo, ainda, busca apresentar alguns resultados e desdobramentos da pesquisa realizada.

Abstract:
The objective of the present work is to study the formation of the university professors in Brazil in a specific reality. We aimed to study the conceptions of the university professors on their teaching practice as well as which were their demands of formation and how the institution they worked for could attend their necessities of formation. This article presents some results and possibilities of the carried out research.