bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evaluation of Daytime Sleepiness and Academic Performance in Dentistry Students
Authors: Pierri Ricardo Augusto Gonçalves , Oliveira Marina Reis , Trento Guilherme , Spin-Neto Rubens , Rodrigues Marcos Marques , Pereira-Filho Valfrido Antonio 
Published: August 2021

Abstract
Objective This study aimed to evaluate the daytime sleepiness and sleep quality of students in different academic years of the dental school program.
Materials and Methods A total of 221 students, from the 1st to the 5th year, answered the questionnaires: Epworth, Pittsburg, Nasal Obstruction Symptom Evaluation, and Berlin, related to daytime sleepiness, sleep quality, nasal obstruction, and obstructive sleep apnea syndrome (OSAS), respectively.
Statistical Analysis The Kolmogorov–Smirnov test was used to assess the normality of continuous quantitative data and, posteriorly, the chi-square test was used to show if there were any associations. The significance level adopted was 5%.
Results An association between daytime sleepiness and nasal obstruction was observed at the beginning of the school year (T1) (p = 0.002) and at the end of the school year (T2) (p = 0.043). In T2, an association between nasal obstruction and sleep quality was also observed (p = 0.026). The academic performance (AP) was only associated with the OSAS in T1 (p = 0.012). There was no significant difference in AP between the beginning and the end of the academic year (p = 0.935).
Conclusion With the methodology used, it was observed that nasal obstruction influenced sleep quality and daytime sleepiness, and daytime sleepiness did not have any influence on AP.
Impact of Bioactive Glass-Based Toothpaste on Color Properties and Surface Microhardness of Bleached Enamel
Authors: Garcia Raíssa Manoel , Vieira-Junior Waldemir Francisco , Theobaldo Jéssica Dias , Aguiar Flávio Henrique Baggio , Leite Lima Débora Alves Nunes 
Published: August 2021

Abstract
Objective The role of toothpaste used during aesthetic treatments is rarely investigated. The objective was to evaluate the effects of a bioactive glass-based toothpaste (BGT) used before or after the dental bleaching with 35% hydrogen peroxide (HP).
Materials and Methods Bovine enamel blocks (4 × 4 mm; n = 12) were submitted to tooth bleaching and different treatments/storage, before or after HP, based on: (1) no toothpaste and immersion in artificial saliva (AS) after HP for 24 hours, 7 days, or 14 days (control); (2) daily BGT use and AS storage for 7 or 14 days (after HP); and (3) daily BGT use and AS storage for 7 or 14 days (prior to HP). Surface and in-depth color were determined using the CIE L*a*b* system (ΔL*, Δa*, Δb*, and ΔE) on enamel surface and underlying dentin. The surface microhardness (SMH) was evaluated using a Knoop microhardness tester.
Statistical Analysis Data were submitted to analysis of variance (ANOVA) (color variables), repeated measures ANOVA (SMH), and Tukey’s test (α = 0.05).
Results The color changes on the enamel or underlying dentin were not statistically different among the groups (p > 0.05). Twenty-four hours after HP presented a decrease in SMH differing from baseline (p < 0.01). This decrease did not occur in the groups previously exposed to BGT (p > 0.05). BGT use after HP for 7 days differed from group with exclusive AS storage (p < 0.05).
Conclusion In-office tooth bleaching can decrease the microhardness of enamel surface; however, the use of BGT promotes the protection or enables the mineral recovery of tooth without the influence the bleaching efficacy.
Expanding the Phenotype of Molybdenum Cofactor Deficiency in Neonates: Report of Two Cases
Authors: Chandran Shanu , Muthanandam Dhayaguruvasan , Ponmudi Nithya , Kumar Manish 
Published: August 2021

AbstractMolybdenum cofactor deficiency (MoCD) is a rare neurometabolic disorder characterized by intractable seizures, progressive microcephaly, tone abnormalities, facial dysmorphism, and feeding difficulties in the neonatal period. We present two different neonatal cases of MoCD with atypical presentations which could have been easily missed. One is a preterm baby admitted with features of sepsis, poor perfusion, and seizures who later developed tone abnormalities and feeding difficulty. The second is a term baby who presented with stridor, respiratory distress, and metabolic acidosis followed by intractable seizures and encephalopathy. Both babies had characteristic radiological and biochemical findings, and genome sequencing identified mutations in MOCS2 and MOCS1 genes, respectively. MoCD presenting as hypoxic-ischemic encephalopathy and cerebral palsy are well described, but its presentation in preterm with “sepsis-like features with drug-responsive seizures” in the early newborn period is not described, and can also cause unnecessary delay in the diagnosis. Its clinical presentation with “stridor, respiratory distress, and metabolic acidosis” is also described for the first time in literature.
Multifocal Calvarial Infarction with Epidural Hemorrhage in a Patient with Sickle Cell Vaso-Occlusive Crisis: A Case Report
Authors: Gudla Vishaal , Presenza Thomas , Scattergood Emily , Solomon Jason 
Published: August 2021

AbstractWhile primarily a hematologic disease, sickle cell anemia is notorious for its multisystemic manifestations, particularly in episodes of vaso-occlusive crisis. Multifocal acute calvarial infarction with associated epidural hemorrhage has rarely been reported in sickle cell vaso-occlusive crisis. In this article, we reported a unique case of a 15-year-old male presenting with sickle cell vaso-occlusive crisis and neuroimaging findings of multifocal calvarial bone infarction and epidural hemorrhage. Radiologists and clinicians should be cognizant of this rare complication of sickle cell anemia to ensure appropriate diagnosis and timely treatment.
Novel allosteric ligands of the angiotensin receptor AT1R as autoantibody blockers
Authors: Singh Khuraijam Dhanachandra , Jara Zaira P. , Harford Terri , Saha Prasenjit Prasad , Pardhi Triveni R. , Desnoyer Russell , Karnik Sadashiva S. 
Published: August 2021

Significance
High-resolution structural knowledge is a key driver for discovering small molecules to target functional motifs in G protein-coupled receptors (GPCRs). Reports of autoantibodies targeting extracellular motifs of GPCRs are increasing with no therapies in sight. We address this void using the autoantibody epitope of AT1R as target to discover small molecule inhibitors of AT1R antibody. Resulting inhibitors also exerted allosteric effects on AT1R agonist signaling. This knowledge is useful for consideration of small molecule autoantibody inhibitor development for other GPCRs in which cryptic allosteric sites can be harnessed, and pharmacological intervention with allosteric ligands is desirable. In the case of AT1R, developing new generation of neutral, negative, or positive allosteric ligand therapeutics appears feasible through rational drug design approaches.
Comprehensible narratives and connected grammar
Authors: Yang Lei 
Published: August 2021

Abstract
Classical Chinese is an integral component of the Chinese language curriculum at many American universities. However, which texts should be taught and how their grammar should be introduced in a textbook, are questions that have seldom been discussed. This article focuses on the selection of original texts and the mode of grammar explanation in an introductory-level textbook for undergraduate students who study Chinese as a second language. In the United States, more and more students study Classical Chinese for Mandarin-proficiency improvement and Chinese cultural perceptions. Responding to the trend, I argue that narrative texts and comparative grammar explanation would not only render a textbook more comprehensible and engaging, but also advance the learner’s practice of Classical Chinese knowledge in Modern Chinese production. This new design thus effectively connects Classical and Modern Chinese in both “content” and “form,” providing a new perspective to the curriculum development of overseas Chinese programs.
Pathways to split ergativity
Authors: Dahl Eystein 
Published: August 2021

AbstractThis paper reassesses the rise of ergative alignment in Anatolian and Indo-Aryan, two branches of the Indo-European linguistic family. Both of these branches acquire split-ergative morphosyntax in the course of their history but via different grammaticalization paths and with different results. In the Anatolian language Hittite, a denominative derivational suffix develops into an ergative case marker, which is restricted to so-called neuter nouns. In Indo-Aryan, on the other hand, a new ergative category with anterior aspectual semantics emerges in Middle Indo-Aryan originating from a P-oriented resultative construction in Old Indo-Aryan.
Progress in detecting and mapping crop diseases, with particular reference to maize using remote sensing
Authors: Mutanga Onisimo , Dhau Inos , Dube Timothy , Adam Elhadi , Ayisi Kingsley K. 
Published: August 2021

Abstract
Disease infection on crops has been increasing over the years, in line with the changing climate, which has provided a conducive environment for disease proliferation. Timely and up-to-date information on disease spread and its magnitude is a critical component of crop management. This study provides a detailed overview on the role of remote sensing in crop disease detection and mapping with particular reference to the implication on maize, a staple food for many countries in the Global South. Studies have shown the capability of various remote sensing approaches in detecting the severity of disease infection. Most studies undertaken focused on disease classification, with hyperspectral data demonstrating satisfactory performance in detecting the early stages of disease infection. Thermal remote sensing has great potential but remains largely unexplored and very few studies have focused on the application of remote sensing on maize crop diseases in different environments. With new developments on unmanned aerial vehicles (AUVs), there is a great potential to mount sensors with useful information for precise crop disease monitoring and the large size and architecture of maize leaves provide opportunities for early detection with high-resolution remotely sensed data.
Ageing brain and geopolitical leadership: a bio-psycho-sociological approach to the fall of Sharif of Mecca Husayn bin Ali, 1908–1924
Authors: Moñivas Jesús Romero 
Published: August 2021

ABSTRACT In 1908 Husayn ibn Ali was proclaimed Sharif of Mecca, in 1916 King of Hejaz and in 1924 Caliph. However, that same year he had to abdicate and ended his last years in exile. What happened? The case of Husayn aims to show the importance of an interdisciplinary approach for understanding the political behavior. The aim of this article is to show that complex social environments require a single/multi-selves structure and that this structure is more or less balanced or biased between the two poles depending on the person's age and the type of social environment.
Impact of Compliant Wall Properties on Peristaltic Transport of a Compressible Non-Newtonian Maxwellian Fluid Through Axisymmetric Cylindrical Tube
Authors: Eldesoky Islam M , Nayel Mohammed S , Galal Abdallah A , Raslan Hagar M 
Published: August 2021

AbstractIn this article, Maxwell’s viscous fluid movement is studied through a cylindrical symmetric tube (pore) with a complaint wall and this movement is peristaltic. The fluid’s compressibility and slip effect have been taken into consideration. The problem was solved with the perturbation approach in terms of small amount that triggers amplitude ratio. Second-order approximation, the net flux caused by the moving wave is determined for various physical parameters like the wall tension, damping force, wall rigidity, slip parameter, wave number, relaxation time and compressibility parameter. The impacts of interested parameters are discussed numerically and illustrated graphically. In various fields of study, such as biological sciences, There are many applications of this study represented in studying blood flow in living things and in industry as well as simulating fluid flow through flexible tubes.
Fuzzy estimation for the difference between two means using different algorithms
Authors: Nigm Khaled Abu-Bakr , Ismail Ahmed Salah , Elsherif Ahmed K 
Published: August 2021

Abstract
New fuzzy algorithms for estimating the difference between two means of two independent random samples have been presented. Algorithms calculations have been done using different assumptions under condition the fuzziness of data which has been defined as Triangular Fuzzy Number because of its simplicity in calculations and its wide use in various applications. First, providing the estimation of the difference between two means by considering the two variances of each sample are known. Second, considering the two variances of the two samples are unknown but equal. Third, estimating the difference between two means by considering the two variances are unknown and unequal. Then, under the same assumptions of variances in the preceding three assumptions the difference between two means under condition crisp data based on different significance levels has been calculated. Finally, the advantages of using fuzzy algorithms have been presented.
Mobile Robot Position Estimation using Milstein Algorithm
Authors: Abd Elfatah Mohamed G , Zaky Hany Nasry , Shams Ahmed 
Published: August 2021

Abstract
Stochastic differential equation (SDE) became a very important mathematical tool in modeling and performance analysis of many systems due to the white noise appeared in them. one of the significant problems is the time delay problem which appeared in many teleoperated systems which has a significant effect in the system performance. The target in this paper is to approximate the mobile robot future position to decrease the time delay in teleoperation. As a result of white noise, heading angle equation of the mobile robot will be converted into a SDE. The approximated solution has been improved by using a higher order of convergence numerical algorithm (Milstein algorithm) with order of convergence equal one for better estimation of future position of mobile robot. The error has been decreased in many parts of the robot path. A simulated results and a comparison between the two numerical algorithms are explained.
Studying of DC Electrical Properties for Gold Sputtered PM-355 Thin Films after Annealing and Ion Beam Irradiation
Authors: Radwan S I , Rashad A M , Tantawy H R 
Published: August 2021

Abstract
This article investigated the dc electrical properties of Au / PM-355 thin films synthesized using magnetron sputtering. PM-355 specimens were cleaned by ethanol and then were deposited by gold of different thicknesses equal to 300, 400, 500, 700, 1000, 1300, and 1500 nm. From dc electrical measurements as resistance, resistivity and conductivity were investigated for these thin films due to determine the optimum Au thickness with good characteristic. Then, this optimum thickness was treated by annealing in air up to 140 °C for 30 minutes. Hence, another organic cleaner, chloroform, was used before the deposition of optimum thickness forming thin film. Also, study the effect of nitrogen ion beam extracted from conical anode-disc cathode ion source carried out for 30 minutes with operating conditions on the organic cleaners and annealing Au / PM-355 thin films. Moreover, Shore D hardness tester was used to measure micro-hardness for all thin films compared by blank PM-355. Then, the comparison was done between the thin films through dc electrical conductivity and micro-hardness data at the absence and presence of ion beam irradiation. Finally, the change in surface morphology of thin films due to different treatments can be observed by scanning electron microscope.
Preparation and Properties of Epoxy Resin Based Conductive Composites
Authors: Yao Shan-Shan , Li Min-Yi , Jin Fan-Long 
Published: August 2021

Abstract
The epoxy resin-based conductive composite was prepared by filling the epoxy resin with carbon fiber powder and graphene. The influence of the additive quantity on the conductive properties and mechanical properties were investigated, and the influence of carbon fiber powder surface treatment on the conductive properties and mechanical properties were investigated. The results show that the addition of carbon fiber powder and graphene can improve the conductivity and mechanical properties of epoxy composites.
Progress in Research of Dragon Rolled Plates
Authors: Lei Wu , Ming Qin , Bing He , Bin Gu 
Published: August 2021

Abstract
Progress in research of dragon rolled thick plates are summarized in this paper. Basic characteristics, reduction and gap supplement, plate bending, rolling force and energy parameters, shear deformation at the center of the thick plates and the materials and methods in current research were introduced. Although the potential of the application of dragon rolling in thick plate production is obvious, there are still many unsolved problems, especially that the experimental data is still less, therefore there is still a lot of work to do from the practical application.
Study on the electrical properties of itaconic acid-based epoxy resin
Authors: Guo Yuntian 
Published: August 2021

Abstract
Plastic limit orders have been upgraded successively, and the pressure on environmental protection has continued to increase. In the field of electrical insulation, the use of bio-based epoxy resin as a substitute for petroleum-based resin reduces the consumption of petroleum resources while also reducing environmental pollution, which is an effective way to realize environmental pollution of electrical materials. In this paper, bisphenol A epoxy resin (DGEBA) and an important bio-based epoxy resin-itaconic acid-based epoxy resin (EIA) were cured under the same conditions to obtain their epoxy network. And its electrical performance has been tested in terms of breakdown field strength, leakage current and dielectric loss factor. It is concluded that EIA has the potential to replace DGEBA in a certain field of power system.
Mechanical properties analysis and experiment on Multi-order excavation shovel of Ophiopogon japonicas harvester
Authors: Zhao Bangtai , Men Linsen , Song Lejian , Wang Yipeng , Ye Jianghong , Jiang Huixia , Liu Yu , Luo Jun , Guo Jia , Guo Xi 
Published: August 2021

Abstract
Aiming at the poor soil crushing capacity and low operating efficiency of the Ophiopogon harvester, reference to potato, panax notoginseng and other block root excavation device. Based on the soil crushing theory, mechanical analysis of the excavation shovel was performed, and the multi-order excavation shovel of Ophiopogon japonicas harvester was designed. Through ANSYS Workbench Mechanical properties analysis of the excavation shovel, obtained the inclination stress-strain cloud map of soil inlet angle and shovel surface. Combined with the stress-strain results, production suggestions were proposed. Binary regression analysis, response surface analysis and reoptimization design of mining parameters were conducted through field test and Design-Expert 12 software. Test results show that when the inlet angle was 25 °, inclination angle was 170 °, tool forward speed was 0.35m/s, Harvest rate was 98.37% and damage rate was 1.35%, ophiopogon japonicas Harvest worked efficiency. Meet the relevant operating requirements of Ophiopogon japonicus harvester.
Microstructure and Properties of Two Cr8 Cold Working Die Steel
Authors: Sha Yuan , Leyu Zhou , Zhengyu Wang , Peng Jiang 
Published: August 2021

Abstract
In this paper, we studied the effect on microstructure and properties during low tempering and high tempering temperature of HNC53 and KD11max Cr8 cold working die steel by means of hardness tester, universal tensile testing machine, pendulum impact tester, metallographic microscope, SEM and EDS. The results showed that the microstructure of the two materials were spheroidized pearlite and large eutectic carbide. After quenching then tempering at high temperature 520°C and low temperature 200°C, the microstructure was martensite, eutectic carbide with large particles and small secondary precipitated carbide which was M7C3 type carbide. When KD11max was tempered at high temperature of 520°C, more nano-level secondary carbonization precipitated, and secondary hardening phenomenon was more obvious. The increase of Si and decrease of C could promote secondary hardening and improve the impact toughness of materials. KD11max impact toughness was better than HNC53.
Simulation and optimization of casting process for aluminum alloy special-shaped parts
Authors: Min CHEN , Yi WANG , Jigui ZHANG , Jiang FU , Jianjun MA 
Published: August 2021

Abstract
This article is aimed at an aluminum alloy special-shaped part, which has a hollow connection inside, and there are multiple cross-sections that are constantly changing, and it is difficult to design the casting process. In response to this difficulty, combined with the existing sand casting, metal casting and investment casting production lines of the factory, the casting process plan is designed and optimized now. With the help of the numerical simulation software Anycasting, through the simulation analysis of the casting process, the problem that the castings are prone to defects in the thin wall and the bottom plate is solved. The conclusions obtained from the simulation analysis were applied to the actual production process, and qualified castings were produced.
Research on temperature-magnetic properties based on metal magnetic memory testing technology
Authors: Bi Zhenfa , Wu Tao , Fang Pengli , Wang Zongkai 
Published: August 2021

Abstract
during the running of high-speed railway, the vibration and friction between wheel set and track will cause the temperature rise between wheel set and track. The metal magnetic memory detection technology is used to detect the small fault of wheel set, and the temperature will have a certain impact on the magnetic memory signal. In order to study the quantitative relationship between temperature and magnetic memory signal, the temperature magnetic property of 25CrMo4 material is proposed in this paper. Through the temperature magnetic experiment and simulation analysis of the material specimen, it is concluded that when the temperature is lower than Curie point, the magnetic flux leakage of the sheet is basically stable. The value in tangential direction is 130A/m, and the value in normal direction is 0A/m. When the temperature reaches Curie point, the value of the tangential direction changes to 169.9 A/m, and the normal direction is still 0A/m; And the temperature magnetic numerical simulation curve is constructed, which provides the basis for carrying out magnetic signal to material small fault under coupling load, and provides the basis for non-destructive testing.
Structure of Ag-Cu clusters resolved by absorption, Raman and vibrational spectroscopy
Authors: Li Weiyin , Zhao Tongtong , Ding Lingling , Zhang Sha 
Published: August 2021

Abstract
The structures of Ag9, Ag10, Ag8Cu1, and Ag6Cu3 clusters and their optical, Raman and vibrational spectra are calculated by GGA/PBE. The results display that the structures of the Ag9, Ag10 and Ag8Cu1 (three isomers) clusters can be distinguished by comparing their energies and optical, Raman and vibrational spectra. The difference between the two isomers of the Ag6Cu3 clusters cannot be distinguished by comparing their energies and cannot be directly observed, with their uniform shapes proved by their optical, Raman and vibrational spectra.