bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical Modeling of a Punch Penetration Test Using the Discrete Element Method
Authors: Basirat Rouhollah , Hamidi Jafar Khademi 
Published: July 2020

Abstract
Understanding the brittleness of rock has a crucial importance in rock engineering applications such as the mechanical excavation of rock. In this study, numerical modeling of a punch penetration test is performed using the Discrete Element Method (DEM). The Peak Strength Index (PSI) as a function of the brittleness index was calculated using the axial load and a penetration graph obtained from numerical models. In the first step, the numerical model was verified by experimental results. The results obtained from the numerical modeling showed a good agreement with those obtained from the experimental tests. The propagation path was also simulated using Voronoi meshing. The fracture was created under the indenter in the first step, and then radial fractures were propagated. The effects of confining pressure and strength parameters on the PSI were subsequently investigated. The numerical results showed that the PSI increases with enhancing the confining pressure and the strength parameter of the rock, including cohesion and the friction angle. A new relationship between the strength parameters and PSI was also introduced based on two variable regressions of the numerical results.
A New Mode of Enterprise Management--Value Enterprise Management
Authors: Chen Yan 
Published: July 2020

In the development of modern enterprises, the management mode is the main factor that determines the height of its development, so it is highly valued.The traditional management mode has many disadvantages, which can not comply with the development trend of the current market economy, which leads to the slow improvement of enterprise management level, which is not conducive to the operation and development of enterprises. The proposal of the concept of value-oriented enterprise management has become a new mode of enterprise management, which is helpful to speed up the reform process of enterprises and enhance their development vitality. Therefore, we should clarify the key points of the construction of the model and gradually improve the level of management. This paper analyzes the concept of value enterprise management, puts forward the application status and classification of value enterprise management model, and explores the construction strategy of value enterprise management model.
Psychological reactions of the population as a factor of adaptation to the COVID-19 pandemic
Authors: Sorokin M. Yu. , Kasyanov E. D. , Rukavishnikov G. V. , Makarevich O. V. , Neznanov N. G. , Lutova N. B. , Mazo G. E. 
Published: July 2020

One of the many negative consequences of the COVID-19 pandemic is the “secondary epidemic” of negative psychological effectsThe aim of the study was to identify socio-psychological factors associated with adaptive behavior in the population.Materials and methods: an on-line survey of 1957 Russian-speaking respondents over 18 years old was performed from 30.03.2020 to 05.04.2020. The level of anxiety distress was verified with the psychological stress scale (PSM-25). Dispersion analyses were used (p<0.05). The size of the effects (SE) was evaluated according to Cohen’s d and Cramer’s V criteria.Results: Increased levels of psychological stress were associated with self-isolation (SE=0.13), social distanc- ing (SE=0.14) and antiseptic usage (SE=0.11). The scores of psychological stress were higher in individuals who search the media for coronavirus news more than once or twice a day (SE=0.11). At the same time, the fre- quency of requests for information about COVID-19 was not linearly associated to the individuals fears for their own lives. The concerns about the availability of protective equipment were specifically associated to compliance with self-isolation measures (SE=0.1). The combination of concerns about the contagiousness of the virus and the unavailability of medication for daily intake were associated with the principles of social distance (SE=0.12 and SE=0.11 respectively). Moreover, concerns about the lack of specific treatment for COVID-19, the danger to one’s own life, the contagiousness of the virus and the lack of protective equipment were associated with the protective behaviours related to hand hygiene (SE=0.12, SE=0.12, SE=0.11, SE=0.11 respectively). Wearing a mask was characterized by the same anxiety patterns as hand hygiene, but their association was inverse (respectively SE=0.13, SE=0.12, SE=0.14, SE=0.15). The most common type of anxious experience—fear for the health of relatives—was not specifically associated with certain types of behavior and accompanied each of its variants.Conclusion: Psychological reactions of the population to the COVID-19 pandemic are specifically associated with adaptive behavior in the dynamics of anti-epidemic measures.
LAMA PENYIMPANAN PADA SUHU RENDAH TERHADAP JUMLAH BAKTERI DAN pH SUSU HASIL PASTEURISASI DALAM KEMASAN
Authors: Danah Ida , Akhdiat Tedi , Sumarni Sri 
Published: July 2020

Penelitian mengenai lama penyimpanan pada suhu rendah terhadap jumlah bakteri dan pH hasil susu pasteurisasi kemasan dilaksanakan di salah satu perusahaan susu di Lembang Kabupaten Bandung Barat.Tujuan penelitian ini untuk mengetahui pengaruh lama penyimpanan dan penyimpanan manakah yang menyebabkan susu hasil pasteurisasi dalam kemasan yang disimimpan pada suhu rendah tidak layak konsumsi. Metode penenilitan adalah eksperimen dengan rancangan percobaan Rancangan Acak Lengkap dengan 5 perlakuan (lama penyimpanan) yaitu H1 = 1 hari; H3 = 3 hari; H5 = 5 hari; H7 = 7 hari; H9 = 9 hari dan di ulangan 5 kali.Hasil penelitian dapat disimpulkan sebagai berikut : 1) Lama penyimpanan 7 dan 9 hari berpengaruh meningkatkan jumlah bakteri dan menurunkan pH susu pasteurisasi dalam kemasan 2) Berdasarkan kelayakan konsumsi, susu pasteurisasi dalam kemasan masih bisa dikonsumsi diantara penyimpanan 7 hari dan 9 hari.
EFFECT OF BREAKFAST SKIPPING ON BODY MASS INDEX ADOLESCENT UNIVERSITY GIRLS
Authors: Dr. Noor fatima  , Dr. Zirwa Noor  , Swaira Shafique  
Published: July 2020

ABSTRACT
BACKGROUND & OBJECTIVE: Breakfast is considered as important meal of the day and it should provide 25 % of total energy intake including all five food groups. Breakfast skipping is common in adolescents and it is associated with changes in Body Mass Index (BMI) and cognitive abilities. Breakfast skipping enhances appetite throughout the remaining day which leads to over eating resulting in overweight and obesity. Addition of breakfast is useful plan of action to improve satiety, reduced food motivation and improve diet quality. Eating breakfast regularly has association between both with less mental distress and healthy life style. For this purpose, this study was designed to determine the prevalence of breakfast skipping in adolescent’s university girls and its effect on their Body Mass Index (BMI).
METHODOLOGY: For the current research, 200 individuals were selected from different departments of The University of Faisalabad. Questionnaire was developed and height, weight and dietary history were measured. The data obtained from the study was tabulated and statistically analyzed by applying Analysis of Variance (ANOVA) and Least Significant Difference (LSD).
RESULTS: Skipping of breakfast has significant effect on increasing the Body Mass Index (BMI) in university adolescent girls.
CONCLUSION: Breakfast skipping resulted in increased BMI in university adolescent girls.
Mobile Apps for Boarding House Recommendation
Authors: Effendy Faried , Kartono Kartono , Herawatie Dyah 
Published: July 2020

<p class="0abstractCxSpFirst"> </p><p>This research aims to build a boarding house recommender system based on the Fuzzy TOPSIS method. This application can be utilized by the student community to discover a suitable boarding house. This research uses the classic life cycle (waterfall) as a software development model. The waterfall model consists of 5 stages, namely, communication, planning, modeling, construction, and deployment. In this study, we focus on the construction and deployment stage.<br />To test and assess the system, we use a questionnaire filled by the respondents. Two arrangements of surveys created, one for the students and another for mobile application experts. We use ISO 9126 as a base to assess the system in terms of functionality, usability, content, reliability, and performance. As a result, these mobile apps graded 3.54 and categorized as an excellent system. This system is well-honorable and acknowledged by the student community, which gives a superior, simple method for promoting and reliable tool for finding appropriate boarding houses. The users recommend adding some features such as boarding communities, ratings, reviews so users can communicate with each other and increase the effectiveness and functionality of the application.</p>
A Comprehensive Appraisal of Laboratory Biochemistry Tests as Major Predictors of COVID-19 Severity
Authors: Aloisio Elena , Chibireva Mariia , Serafini Ludovica , Pasqualetti Sara , Falvella Felicia S. , Dolci Alberto , Panteghini Mauro 
Published: July 2020

Context.—A relevant portion of coronavirus disease 2019 (COVID-19) patients develop severe disease with negative outcomes. Several biomarkers have been proposed to predict COVID-19 severity, but no definite interpretative criteria have been established to date for stratifying risk.Objective.—To evaluate 6 serum biomarkers (C-reactive protein, lactate dehydrogenase, D-dimer, albumin, ferritin, and cardiac troponin T) for predicting COVID-19 severity and to define related cutoffs able to aid clinicians in risk stratification of hospitalized patients.Design.—A retrospective study of 427 COVID-19 patients was performed. Patients were divided into groups based on their clinical outcome: nonsurvivors versus survivors and patients admitted to an intensive care unit versus others. Receiver operating characteristic curves and likelihood ratios were employed to define predictive cutoffs for evaluated markers.Results.—Marker concentrations at peak were significantly different between groups for both selected outcomes. At univariate logistic regression analysis, all parameters were significantly associated with higher odds of death and intensive care. At the multivariate analysis, high concentrations of lactate dehydrogenase and low concentrations of albumin in serum remained significantly associated with higher odds of death, whereas only low lactate dehydrogenase activities remained associated with lower odds of intensive care admission. The best cutoffs for death prediction were greater than 731 U/L for lactate dehydrogenase and 18 g/L or lower for albumin, whereas a lactate dehydrogenase activity lower than 425 U/L was associated with a negative likelihood ratio of 0.10 for intensive treatment.Conclusions.—Our study identifies which biochemistry tests represent major predictors of COVID-19 severity and defines the best cutoffs for their use.
Ampliação da distribuição de espécies de vespas sociais neotropicais no Brasil (Hymenoptera: Vespidae: Polistinae)
Authors: Souza Marcos Magalhães de , Pires Epifânio Porfiro , Coelho Evando Luiz , Clemente Mateus Aparecido , Bonfitto Paloma Pereira 
Published: July 2020

Apesar do crescente esforço para o conhecimento da diversidade de vespas sociais neotropicais que ocorreu na última década, ainda há, biomas, regiões e/ou estados subamostrados ou com ausência de listas de espécies. Nessa perspectiva foram realizadas coletas esporádicas em diferentes estados e ecossistemas brasileiros no período de 2013 a 2015. Esse esforço amostral resultou em novos registros para estado do Maranhão: Polistes subsericius Saussure, 1854; Ceará: Metapolybia servilis Cooper, 1999, sendo esta, até o momento desconhecida no Brasil; para o estado do Tocantins, todos os registros foram inéditos, uma vez que, o estado não apresenta listas de vespas sociais: Apoica pallida (Olivier, 1792), Apoica thoracica du Buysson, 1906, Apoica strigata Richards, 1978, Apoica arborea de Saussure, 1854, Mischocyttarus flavicornis Zikán, 1935 e Polybia striata (Fabricius, 1787).
Functionalized MXene Enabled Sustainable Water Harvesting and Desalination
Authors: Fei Jipeng , Koh See Wee , Tu Wenguang , Ge Junyu , Rezaeyan Hamid , Hou Shuai , Duan Hongwei , Lam Yee Cheong , Li Hong 
Published: July 2020

AbstractSolar irradiation is a promising resource for sustainable energy conversion and storage in many technological fields. Interfacial solar steam generator is emerging as a sustainable system for water harvesting under natural solar irradiance. However, natural sunlight is usually insufficient for conventional interfacial (2D absorber) solar steam generators to achieve high solar steam efficiency (>85%). Herein, a functionalized MXene‐polymeric membrane‐based solar steam generator in a heat localization structure is reported as an efficient water harvesting and desalination system. The functionalized MXene flakes are homogeneously dispersed and encapsulated in polymeric networks of cellulose acetate in the crosslinking process, where water is automatically pumped through the absorber in the embedded nano/micro channels. As such, the fabricated solar steam generator shows a net evaporation rate (with respect to that in the dark condition) of 1.47 kg m−2 h−1with 92.1% efficiency under 1 sun illumination. Moreover, the salt rejection rate for high salinity seawater (original Na+concentration is 18 000 mg L−1) reaches up to 97.5%, generating drinkable water that meets the WHO standard. The new photothermal membrane absorber is cost‐effective, scalable, washable, and stable under harsh conditions; holding great promise for practical solar desalination applications.
LACHT syndrome (Mardini–Nyhan association) with tracheal stenosis in a Thai newborn
Authors: Rojnueangnit Kitiwan , Kositamongkol Sudatip , Paoin Wanida , Satdhabudha Araya , Pharadornuwat Onsuthi , Wongwandee Ratthapon , Thammachote Weerin , Jinawath Natini 
Published: July 2020

AbstractLACHT syndrome, or Mardini–Nyhan association, is an ultra‐rare disorder, diagnosed solely by the clinical characteristics of lung agenesis, complex cardiac defects, and thumb anomalies. Only 12 patients have been reported worldwide, and here, we report a new clinical diagnosis of LACHT syndrome. Our patient was a male full‐term newborn with left lung agenesis, congenital heart defects including ventricular septal defect, right‐sided aortic arch, with aberrant left subclavian artery and Kommerell diverticulum, as well as left preaxial polydactyly and hemivertebra. Our patient appears to be the second LACHT syndrome case to also suffer from tracheal stenosis, which has only been reported once before in conjunction with this syndrome. In light of this, tracheal stenosis may be a phenotype for LACHT syndrome.
General Formation of Macro‐/Mesoporous Nanoshells from Interfacial Assembly of Irregular Mesostructured Nanounits
Authors: Chen Guangrui , Yan Yuxing , Wang Jie , Ok Yong Sik , Zhong Guiyuan , Guan Bu Yuan , Yamauchi Yusuke 
Published: July 2020

AbstractMesoporous core–shell nanostructures with controllable ultra‐large open channels in their nanoshells are of great interest. However, soft template‐directed cooperative assembly to mesoporous nanoshells with highly accessible pores larger than 30 nm, or even above 50 nm into macroporous range, remains a significant challenge. Herein we report a general approach for precisely tailored coating of hierarchically macro‐/mesoporous polymer and carbon shells, possessing highly accessible radial channels with extremely wide pore size distribution from ca. 10 nm to ca. 200 nm, on diverse functional materials. This strategy creates opportunities to tailor the interfacial assembly of irregular mesostructured nanounits on core materials and generate various core–shell nanomaterials with controllable pore architectures. The obtained Fe,N‐doped macro‐/mesoporous carbon nanoshells show enhanced electrochemical performance for the oxygen reduction reaction in alkaline condition.
Atomic Insights into Aluminium‐Ion Insertion in Defective Anatase for Batteries
Authors: Legein Christophe , Morgan Benjamin J. , Fayon Franck , Koketsu Toshinari , Ma Jiwei , Body Monique , Sarou‐Kanian Vincent , Wei Xian‐Kui , Heggen Marc , Borkiewicz Olaf J. , Strasser Peter , Dambournet Damien 
Published: July 2020

AbstractAluminium batteries constitute a safe and sustainable high‐energy‐density electrochemical energy‐storage solution. Viable Al‐ion batteries require suitable electrode materials that can readily intercalate high‐charge Al3+ ions. Here, we investigate the Al3+ intercalation chemistry of anatase TiO2 and how chemical modifications influence the accommodation of Al3+ ions. We use fluoride‐ and hydroxide‐doping to generate high concentrations of titanium vacancies. The coexistence of these hetero‐anions and titanium vacancies leads to a complex insertion mechanism, attributed to three distinct types of host sites: native interstitial sites, single vacancy sites, and paired vacancy sites. We demonstrate that Al3+ induces a strong local distortion within the modified TiO2 structure, which affects the insertion properties of the neighbouring host sites. Overall, specific structural features induced by the intercalation of highly polarising Al3+ ions should be considered when designing new electrode materials for polyvalent batteries.
An Ultrastable, Small {Ag7}5+ Nanocluster within a Triangular Hollow Polyoxometalate Framework
Authors: Yonesato Kentaro , Ito Hiroyasu , Yokogawa Daisuke , Yamaguchi Kazuya , Suzuki Kosuke 
Published: July 2020

AbstractSmall Agn nanoclusters (n<10) have been emerging as promising materials as sensing, biolabeling, and catalysis because of their unique electronic states and optical properties. However, studying synthesis, structure determination, and exploration of their properties remain major challenges as a result of the low stability of small Ag nanoclusters. Herein, we synthesized an atomically precise face‐centered‐cubic‐type small {Ag7}5+ nanocluster supported by a novel triangular hollow polyoxometalate (POM) framework [Si3W27O96]18−. The cluster showed unique {Ag7}5+‐to‐POM charge transfer bands in both visible and UV light regions. Furthermore, this small {Ag7}5+ nanocluster exhibited an unprecedented ultrastability in solution, despite having exposed Ag sites that can be accessed by small molecules, such as O2, water, and solvents.
pH/temperature‐responsive poly(dimethylaminoethyl methacrylate) grafted κ‐carrageenan copolymer: Synthesis and physicochemical properties
Authors: Geyik Gülcan , Işıklan Nuran 
Published: July 2020

Abstractκ‐Carrageenan‐graft‐poly(dimethylaminoethyl methacrylate) (CRG‐g‐PDMA) was synthesized via free‐radical copolymerization under microwave irradiation. 13C‐Nuclear magnetic resonance spectroscopy (13C‐NMR), fourier‐transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) methods were used for characterization of the CRG‐g‐PDMA structure. The effect of reaction variables including the concentrations of the initiator and dimethylaminoethyl methacrylate (DMA) as well as the microwave irradiation time and power on graft ratio and conversion was investigated, and their highest values were obtained to be 179 and 76%, respectively. The lower critical solution temperatures (LCSTs) of the CRG‐g‐PDMA copolymers were determined at various pH conditions, and their value in distilled water was found as 47°C. Besides, the swelling capacity of the copolymers under different pH levels was investigated and it was seen that the swelling capacity of the copolymer increased with the decrease in the pH value of the medium. The CRG‐g‐PDMA copolymer exhibited excellent swelling performance in acidic pH conditions and possessed responsiveness to pH and temperature stimuli.
Assessing thermomechanical properties of a reactive maleic anhydride grafted styrene‐ethylene‐butylene‐styrene/thermoplastic polyurethane blend with temperature scanning stress relaxation method
Authors: M. G. Anagha , Chatterjee Tuhin , Naskar Kinsuk 
Published: July 2020

AbstractThe phenomenon of stress relaxation in thermoplastic elastomers (TPEs) is common and influences the end‐use properties of polymers. Temperature scanning stress relaxation (TSSR) method extends an advanced method to study the stress relaxation of TPEs at elevated temperatures. A reactive blend system based on maleic anhydride grafted styrene‐ethylene‐butylene‐styrene and thermoplastic polyurethane is explored for its relaxation behavior at temperature up to 200°C with TSSR meter. The relaxation spectrum revealed the transitions occurring in the blends as well as the extent of interfacial interaction present. Direct measurement of elasticity of the blends was obtained from the TSSR index (RI). Glass transition temperature of the samples was measured from dynamic mechanical analysis. The elastic nature of the blends was also pursued from the storage modulus values and results were in line with TSSR results. The density of crosslinks in the system was assessed with both TSSR and the conventional Flory‐Rehner equation and a similar trend was obtained. Atomic force microscopy and scanning electron microscopy revealed the dispersed morphology of the blends.
One‐pot synthesis of Cu/SAPO‐34 with hierarchical pore using cupric citrate as a copper source for excellent NH3‐SCR of NO performance
Authors: Wang Peiqiang , Li Zhibin , Wang Xiaotong , Tong Yongming , Yuan Fulong , Zhu Yujun 
Published: July 2020

AbstractIt is still a serious challenge to develop a simple synthesized method of SAPO‐34 sieve modified by Cu with high NH3‐SCR performance. The Cu/SAPO‐34 samples with hierarchical structure were synthesized for the first time using cupric citrate as copper source by one‐pot hydrothermal method which showed excellent NH3‐SCR performance for NO removal. Among them, the 0.15Cu/SAPO‐34 catalyst with a Cu/Al ratio of 0.15 exhibited the widest temperature operating window (160–500 °C) and better hydrothermal stability. The physicochemical properties of 0.15Cu/SAPO‐34 was measured to understand the impacts of the Cu species on the NH3‐SCR of NO activity by various characterization methods including XRD, NH3‐TPD, N2adsorption‐desorption, XPS, EPR, UV‐vis, NH3‐oxidation, NMR andin situDRIFTS. The results reveal that the good activity is assigned to the isolated Cu species located at the site (I) in SAPO‐34, and the co‐existence of surface Cu2+and Cu+species with almost equal amounts. In addition, 0.15Cu/SAPO‐34 also possesses suitable acidic sites which are conducive to catalytic activity. The results ofin situDRIFTS suggest that the NH3‐SCR reaction follows Eley‐Rideal mechanism over 0.15Cu/SAPO‐34.