bluuebunny/crossref_metadata_2025_split huggingface dataset:
The influence of molecular structure on the thermal properties and processability of nitrile-based resin molecules
Authors: Mengdi Chen , Wei Liao , Changping Yin , Suli Xing , Su Ju , Liping Sheng 
Published: August 2021

Abstract
With the increase in the speed of various aircraft and the demand for lightweight weapons and equipment, the demand for high-performance, high-temperature-resistant resin-based composite materials has become more urgent. The temperature resistance and molding process of composite materials are determined by the temperature resistance and manufacturability of the resin, so there is an urgent need to develop a resin that has both high temperature resistance and excellent process performance. The temperature resistance and processability of the resin are essentially determined by the molecular structure of the resin system. Therefore, in order to design a resin system with excellent heat resistance and processability, the relationship between molecular structure and performance must first be recognized. This paper collects a large amount of experimental data and preliminarily summarizes the influence of different molecular structures on the thermal performance and resin processability of resin polymers from the perspective of structure and performance. This provides a good experience and theoretical basis for the design of high-performance resin systems, providing references and ideas for related research.
Performance Evaluation of Polypropylene Resin for Capacitor Film
Authors: Sainan SONG , Xia WANG , Ruijuan MU , Zhaoliang XING , Xiying Dai 
Published: August 2021

Abstract
The molecular structure and mechanical properties of 3 kinds of imported polypropylene particles for capacitor film were analyzed by Gel Permeation Chromatograph (GPC), differential scanning calorimeter (DSC) and electronic tensile machine. The results showed that the melt index of imported polypropylene for capacitor film was about 3.0g/10min, the ash content was about 20ppm, the isotacticity index was higher than 98.5%, the crystallinity was higher than 45%, and the molecular weight distribution was wider than 6.0. The data showed these three kinds of imported polypropylene for capacitor film were all low-ash and higher isotactic polypropylene with high crystallinity and good mechanical tensile properties.
Adsorption characteristics of carbon nanotubes on low concentration erythromycin in water
Authors: Wang Tao , Kuang Bin , Li Zhensheng , Lin Ziyang , Du Siyuan , Guo Bing 
Published: August 2021

Abstract
Multi-walled carbon nanotubes (MWNTs) were used to adsorb low concentration erythromycin from natural water. The kinetic curves and adsorption isotherms were measured and the thermodynamic parameters were calculated. The effects of pH value, ionic strength and humic acid on the adsorption process were investigated. The results showed that the adsorption of carbon nanotubes to erythromycin was rapid in the first 40 min, and reached equilibrium within 200 min. The dynamics curve conforms to the quasi-second-order dynamics model. The Freundlich model can better fit the adsorption test data. Thermodynamic parameters show that the adsorption of Erythromycin by MWNTs is a spontaneous endothermic process. The adsorption activation energy Ea shows that the adsorption between MWNTs and erythromycin is a chemisorption process, and the content of oxygen-containing functional groups on the surface of CNTs determines the equilibrium adsorption amount. Ionic strength has obvious effect on adsorption. Increasing the pH value of the solution from 5 to 9 was beneficial to increasing the adsorption capacity of erythromycin. The adsorption capacity of carbon nanotubes to erythromycin was significantly increased with appropriate humic acid.
Analysis and Comparison on Dynamic Characteristics of CFST Arch Bridge
Authors: Ji Jing , Lin Yubo , Xu Ming , Zhong Meihui , Jiang Liang qin 
Published: August 2021

AbstractIn order to obtain the natural frequency and vibration mode of concrete-filled steel tube (CFST) arch bridge with different parameters, the modal analysis of a double-span arch bridge with a total length of 257.4 meters and a full width of 31.8 meters is carried out. By controlling the three variables of concrete strength, steel tube thickness and the number of transverse braces in arch ribs, the regularity of the natural frequency and vibration mode of CFST arch bridge with different variables is discussed. The results show that with the increasing of the strength of concrete-filled steel tube in arch ribs, the fundamental frequency increases gradually. The vertical stiffness of the arch bridge is positively related to the thickness of the arch rib steel pipe. The fundamental frequency of the arch bridge can be improved by setting transverse brace, and the change of the number of transverse braces has a significant effect on the sixth-order natural frequency. It is limited for the arch bridge to improve the stiffness by changing the number of transverse braces. These can lay the foundation for the dynamic response analysis of the CFST arch bridge.
Research Progress on Comprehensive Utilization of Red Mud
Authors: Lingxiang HUANG , Chunlei LI , Haibin WANG , Xingxing LI , Yongrong QI , Xuechen ZHU 
Published: August 2021

Abstract
Red Mud(RM), a kind of hazardous solid wastes produced during the process of alumina production, is disadvantageous for our environments owning to its characters of strong alkali and rich salt. It is essential to conduct innocent treatment. Summarizing the hazards of RM and methods of its comprehensive utilization, A reference for the deeper comprehensive utilization of RM in the future in this review was provided.
Design and research of uranium-containing wastewater treatment equipment based on new organometallic framework materials (MOF-808)
Authors: Rong Lishan , Huang Zefeng , Ouyang Ji , Liu Shaoqian , Yuan Bin , Xia Lin , Xiong Chaofan 
Published: August 2021

Abstract
With the significant increase in the amount of natural uranium mining in various countries around the world, a large amount of waste rocks are piled up in the tailings pond. If the uranium-containing wastewater is not treated, it will bring serious environmental problems. After related experiments in the laboratory, it is measured that the adsorption rate of high-tech products-MOF-808 material to uranium ions can reach 97% (the optimal pH=7.0, and the optimal dosage is 0.2mg/L). It can be used as a good adsorption material. Based on the high-efficiency selective adsorption of this material to uranium, a set of equipment using MOF-808 was designed in this paper. This device adopts improved intermittent processing, high integration and automation level, and small floor space. According to the desorption characteristics of the material, a simple membrane cleaning method is designed to recover high-concentration uranium-containing cleaning liquid, which greatly reduces the amount of mud and can produce considerable economic benefits. In addition, cleaning and operation can be carried out at the same time, realizing continuous uranium-containing wastewater treatment, which meets the requirements of energy saving and emission reduction, and is beneficial to the construction of green mines.
Research on fragmentation quality percentage of coal in hot air dense medium fluidized bed
Authors: Li Lingyue 
Published: August 2021

Abstract
This paper studies the percentage of pulverized coal in the hot air dense medium fluidized bed, and investigates the influence of coal surface moisture, drying temperature, drying time, air volume and other factors on the percentage of crushing, and establishes a mathematical correlation formula for the percentage of crushing; it shows that with the increase of drying temperature, the percentage of crushing increases; with the increase of air volume, the percentage of crushing increases; the percentage of crushing increases with the increase of drying time and increases with the increase of surface moisture of coal.
Experimental study on shortcut simultaneous nitrogen removal in treating domestic sewage
Authors: Pengsheng ZHENG , Yan XIAO , Jianchao YANG , Fei HONG 
Published: August 2021

Abstract
To treat domestic sewage with high efficacy and low cost, the technology of shortcut simultaneous nitrogen removal was used with a new biofilm reactor. The influences on nitrogen removal effect by start-up procedure, nitrogen transformation characteristics and main factors (hydraulic retention time, dissolved oxygen, carbon-nitrogen ratio) were analyzed. The results indicate that: The reactor finished start-up of shortcut simultaneous nitrogen removal in 14 days of cultivation time after the biofilm cultured in the carrier. The ammonia nitrogen removal rate, simultaneous nitrification-denitrification rate and cumulative nitrite nitrogen rate respectively reached 91.3%, 82.7% and 63.4% in the last phase of start-up procedure. To remove ammonia nitrogen with the technology of shortcut simultaneous nitrogen removal efficiently and steadily, hydraulic retention time, dissolved oxygen, carbon-nitrogen ratio should be controlled in 3.56 hours, 1.5 mg/L and 5~8.
Directly freeze-drying porous graphene aerogel as acoustic-absorbing material
Authors: Li Zengling , Chen Nan , Qu Liangti 
Published: August 2021

Abstract
Noise pollution, which is no less harmful than air, water and soil pollution, is becoming an environmental shortcoming that cannot be ignored. Scientists are also seeking various solutions to work on reducing noise pollution. In this work, porous graphene aerogel (FD-GA) and porous graphene oxide aerogel (FD-GOA) prepared by foaming combined with freeze-drying are reported as acoustic-absorbing materials. The effects of thickness and degree of compression on the acoustic-absorbing performance of FD-GA and FD-GOA in the 1000-6000 Hz range, where human ear hearing is sensitive, were investigated, respectively. FD-GA was found to have significantly higher acoustic absorption performance with a peak absorption of 96.7%. The present work provides a simple and straightforward strategy for the synthesis of the acoustic-absorbing material. Key words: freeze-drying, graphene aerogel, acoustic-absorbing
Sedimentary characteristics of Yan 6 oil layer of Yan’an Formation in X area of Ordos Basin
Authors: Zhao Meifang , Wang Jifeng 
Published: August 2021

Abstract
Using core, mud logging and logging data, the study on the sedimentary characteristics of the Yan 6 oil layer of the Yan'an Formation in the X area of the Ordos Basin was carried out. It is believed that the Yan 6 oil layer in X area mainly develops delta deposits, and the subfacies is delta plain. The sedimentary microfacies are mainly diversion channels, inter-branch swamps and natural dikes. According to coring well data, sand body shape analysis, and logging facies analysis. Vertically, the sand bodies in the Yan 6 oil layer group are discontinuous, and there are mainly distributary channels and inter-branch swamps. Horizontally, the Yan 6 oil layer group develops 7 river channels, which are distributed in a strip on the plane, and the extension direction is northwest-south east. The comprehensive characterization of the sedimentary microfacies and the distribution of reservoir sand bodies in Yan 6 oil layer provides a reliable basis for the oil field to adjust the oil production plan in time.
Active underwater acoustic control of polymer based piezoelectric composites
Authors: Simin Zou 
Published: August 2021

Abstract
Acoustic stealt of the submarin has always been the most valuable research field for Security Department of the Navy over the world. In this paper, the feasibility of underwater anechoic coating with the polymer matrix piezoelectric composite material has been studied. On the basis of the Thomson-Haskell matrix method, we have derived the reflected transform matrix and calculated a semi-analytical solution to the problem by using the MATLAB. It is found that the underwater anechoic effects of this new material are related to the material proportion of each composites, the control voltage, geometric parameters, incident angle and frequency and so on. The studies have showed that: the polymer matrix piezoelectric composite material takes the advantages of both the viscoelastic material and the piezoelectric material and the use of the new material has a superior nature than the traditional materials to the suppression of underwater acoustic reflection.
Pretreatment in the Determination of Trace Copper and Iron in Transformer Oil
Authors: Liang Qinqin , Luo Zongchang 
Published: August 2021

Abstract
Comparative trace copper and iron analysis of unused and running transformer oil is performed by iCP-MS with pretreatment by ashing, acid dissolution and direct injection method. The advantages and drawbacks of each of the listed methods are discussed. The direct injection method is so simple and time-consuming that can realize accurate determination of copper in oil, while it is not suitable for determination of iron in used transformer oil. Although limited by availability of equipment, acid dissolution method has good accuracy and reproducibility for the determination of transformer oil in all states.
Ionization of H(2p) atom by 30 keV proton and antiproton impact
Authors: Nassar Tarek E I 
Published: August 2021

Abstract
Ionization process of the hydrogen atom, being initially in the excited 2p-state, projected by 30 keV proton and antiproton impact has been investigated. The second-Born approximation (SBA) is used to measure the triple differential cross sections (TDCSs). The closure relation is employed on the second-Born term to come over consideration of the intermediate states. The triple differential cross-sections are represented graphically against the ejection angle, for two scattering angles and ejected energies into both scattering and perpendicular geometric planes. The single differential cross-section (SDCS) is calculated in the framework of the first-Born approximation.
Collective behavior of coupled multiplicative processes with stochastic resetting
Authors: Gómez Garay Ignacio T , Zanette Damián H 
Published: August 2021

Abstract
A dynamical variable driven by the combination of a deterministic multiplicative process with stochastic reset events develops, at long times, a stationary power-law distribution. Here, we analyze how such distribution changes when several variables of the same kind interact with each other through diffusion-like coupling. While for weak coupling the variables are still distributed following power-law functions, their distributions are severely distorted as interactions become stronger, with sudden appearance of cutoffs and divergent singularities. We explore these effects both analytically and numerically, for coupled ensembles of identical and non-identical variables. The most relevant consequences of ensemble heterogeneity are assessed, and preliminary results for spatially distributed ensembles are presented.
Representative methods of computational socioeconomics
Authors: Zhou Tao 
Published: August 2021

Abstract
The increasing availability of data sources and analysis tools borrowed from computer science and physical science have sharply changed traditional methodologies of social sciences, leading to a new branch named computational socioeconomics, which studies various phenomena in socioeconomic development by using quantitative methods based on large-scale real-world data. Sited on recent publications, this perspective will introduce three representative methods: (i) natural data analyses, (ii) large-scale online experiments, and (iii) integration of big data and surveys. This perspective ends up with in-depth discussion on the limitations and challenges of the above-mentioned emerging methods.
Protection of Copyright in Foreign Works in Nigeria: An Analysis of the Decision in Voice Web International Limited v Emerging Markets Telecommunication Services Ltd & Ors
Authors: Adewopo Adebambo , Itanyi Nkem 
Published: August 2021

Abstract
The protection for copyright in foreign works in Nigeria has been a contentious and controversial issue for over three decades. In this case analysis, through a trilogy of cases, we trace the judicial trend and jurisprudence on this issue of copyright law. We argue that although Sec. 5 and Sec. 41 of the Nigerian Copyright Act provide two methods by which foreign works can receive protection under the Act, the courts have repeatedly declined to confer such protection. The most recent case on this issue, Voice Web International Limited v Emerging Markets Telecommunication Services Ltd & Ors, provided an opportunity for the courts to lay the issue to rest; however, unfortunately, the courts again failed to do so. In this opinion, we critically examine the case and discuss the legislative history conferring protection to foreign works. We conclude that the correct statutory interpretation in determining the protection of foreign works is reciprocity, and this was satisfied in the case under review.
Rapid structure-function insights via hairpin-centric analysis of big RNA structure probing datasets
Authors: Radecki Pierce , Uppuluri Rahul , Aviran Sharon 
Published: August 2021

Abstract
The functions of RNA are often tied to its structure, hence analyzing structure is of significant interest when studying cellular processes. Recently, large-scale structure probing (SP) studies have enabled assessment of global structure-function relationships via standard data summarizations or local folding. Here, we approach structure quantification from a hairpin-centric perspective where putative hairpins are identified in SP datasets and used as a means to capture local structural effects. This has the advantage of rapid processing of big (e.g. transcriptome-wide) data as RNA folding is circumvented, yet it captures more information than simple data summarizations. We reformulate a statistical learning algorithm we previously developed to significantly improve precision of hairpin detection, then introduce a novel nucleotide-wise measure, termed the hairpin-derived structure level (HDSL), which captures local structuredness by accounting for the presence of likely hairpin elements. Applying HDSL to data from recent studies recapitulates, strengthens and expands on their findings which were obtained by more comprehensive folding algorithms, yet our analyses are orders of magnitude faster. These results demonstrate that hairpin detection is a promising avenue for global and rapid structure-function analysis, furthering our understanding of RNA biology and the principal features which drive biological insights from SP data.
Assessment of the Diversity and Inclusion Culture in a Physician Assistant Program
Authors: Palfreyman Lori Parlin , Joseph Jennifer , Parrott James Scott 
Published: August 2021

Purpose
Physician assistant (PA) programs aim to foster a collaborative culture that enables stakeholders to feel included, empowered, and valued. The purpose of this study was to explore the cultural climate of diversity and inclusion in one PA program to identify areas of strength and to serve as a baseline needs assessment for future program initiatives.

Methods
The study used a cross-sectional, descriptive approach for PA survey data (N = 85) to assess perceptions of diversity and inclusion of PA program students, faculty, and staff.

Results
The respondents largely agreed that the program created an inclusive learning environment (92%), the curriculum positively affected their understanding of diversity and cultural responsiveness (84.6%), and the program had an adequate amount of inclusivity for all program stakeholders (87%). Some faculty members (25%) and students (6.2%) disagreed that faculty were open to diverse political beliefs, and 35% of the respondents believed that more emphasis could be put on religious diversity. A few students (7.7%) perceived faculty as not supportive of non-native English language speakers; students of color (11.5%) were more likely than White students (5.1%) to have this perception.

Conclusions
This study largely met the goal to create a professional environment of mutual respect and, ultimately, a climate of inclusiveness. It also identified opportunities for new initiatives to meet the needs of all program stakeholders. Follow-up research that distinguishes faculty from students and a multicenter study to explore perspectives based on demographic differences would be timely and useful.
Marixanthomonas spongiae sp. nov., isolated from marine sponge
Authors: Zhuang Lingping , Pang Haiyue , Xu Li , Chen Dan 
Published: August 2021

A novel bacterial strain, designated as HN-E44T, was isolated from marine sponge collected from Yangpu Bay, Hainan, PR China. Strain HN-E44T was Gram-stain-negative, non-motile, catalase-positive, oxidase-negative, rod-shaped and yellow-pigmented. Growth occurred at 4–37 °C (optimum, 28 °C), at pH 6–8 (pH 7) and in 0.5–14 % (w/v) NaCl (3–5 %). Phylogenetic analysis based on 16S rRNA gene sequences showed that strain HN-E44T formed an independent cluster with

Marixanthomonas ophiurae

JCM 14121T within the family

Flavobacteriaceae

and had the highest sequence similarity of 93.6 % to the closest type strain

M. ophiurae

JCM 14121T. The major fatty acids were iso-C15 : 0, anteiso-C15 : 0, iso-C17 : 0 3-OH, summed feature 3 (C16 : 1
ω7c and/or C16 : 1
ω6c) and iso-C15 : 1 G. The polar lipids comprised phosphatidylethanolamine, sphingolipid, four unidentified phospholipids, an unidentified aminophospholipid and an unidentified lipid. The respiratory quinone was identified as MK-6. The genomic DNA G+C content was determined to be 40.6 mol%. The average nucleotide identity (ANI) and average amino acid identity (AAI) values between strain HN-E44T and closest type strain

M. ophiurae

JCM 14121T were, respectively, 79.6 and 85.2 %, both of which were below thresholds for species delineation (95–96 % ANI and 95–96 % AAI), but were over thresholds for genus delineation (73.98 % ANI and 70–76 % AAI). The combined genotypic and phenotypic distinctiveness demonstrated that strain HN-E44T could be differentiated from closely related genera. Therefore, it is proposed that strain HN-E44T represents a novel species of the genus

Marixanthomonas

, for which the name Marixanthomonas spongiae sp. nov. is proposed, with the type strain HN-E44T (=MCCC 1K03332T=LMG 30459T).
Improving the reproduction number calculation by treating for daily variations of SARS-CoV-2 cases
Authors: Drewes Harry , Fläschner Gotthold , Möller Peter 
Published: August 2021

ABSTRACTThe Covid-19 pandemic impacted the human life all over the globe, starting in the year of its emergence, 2019, and in the following years. A epidemiological key indicator that gained particular recognition in politics and decision making is the time-dependent reproduction number Rt, which is commonly calculated by institutions responsible for disease control following a method presented by Cori et. al. Here, we propose an improved as well as an alternative method, which make the calculation more stable against oscillations arising from daily variations in testing. Both methods can be used without great statistical knowledge or effort. The methods provides a smoother result without increasing the time-lag, and provides an advantage particular in the timeframe of weeks, which might serve as a better ground for forecasts and the raising of alarms.