bluuebunny/crossref_metadata_2025 huggingface dataset:
In Situ Grafting of Silica Nanoparticle Precursors with Covalently Attached Bioactive Agents to Form PVA-Based Materials for Sustainable Active Packaging
Authors: Klein Miri , Molad Filossof Anat , Ashur Idan , Vernick Sefi , Natan-Warhaftig Michal , Rodov Victor , Banin Ehud , Poverenov Elena
Published: August 2021

Sustainable antibacterial–antioxidant films were prepared using in situ graftings of silica nanoparticle (SNP) precursors with covalently attached bioactive agents benzoic acid (ba) or curcumin (cur) on polyvinyl alcohol (PVA). The modified PVA-SNP, PVA-SNP-ba and PVA-SNP-cur films were characterized using spectroscopic, physicochemical and microscopic methods. The prepared films showed excellent antibacterial and antioxidant activity, and increased hydrophobicity providing protection from undesired moisture. The PVA-SNP-ba films completely prevented the growth of the foodborne human pathogen Listeria innocua, whereas PVA-SNP-cur resulted in a 2.5 log reduction of this bacteria. The PVA-SNP-cur and PVA-SNP-ba films showed high antioxidant activity of 15.9 and 14.7 Mm/g TEAC, respectively. The described approach can serve as a generic platform for the formation of PVA-based packaging materials with tailor-made activity tuned by active substituents on silica precursors. Application of such biodegradable films bearing safe bioactive agents can be particularly valuable for advanced sustainable packaging materials in food and medicine.
α-Mangostin/γ-Cyclodextrin Inclusion Complex: Formation and Thermodynamic Study
Authors: Suharyani Ine , Muchtaridi Muchtaridi , Mohammed Ahmed Fouad Abdelwahab , Elamin Khaled M. , Wathoni Nasrul , Abdassah Marline
Published: August 2021

α-Mangostin (α-M) has various biological activities, such as anti-cancer, antibacterial, anti-fungal, anti-tyrosin, anti-tuberculosis, anti-inflammatory, and antioxidant. However, it has very low solubility in water. The formulation of this compound requires high amounts of solubilizers, which limits its clinical application. In addition, its low solubility in water is a barrier to the distribution of this drug, thus affecting its potency. Cyclodextrin (CD) is widely used as a solubility enhancer of poorly soluble drugs. This study aimed to increase the solubility of α-M in water through complex formation with CD. The complex of α-Mangostin and γ-Cyclodextrin (α-M/γ-CD CX) was prepared by the solubilization method, resulting in a solubility improvement of α-M in water. Characterization of α-M/γ-CD CX by using FTIR-Spectrometry, XRD, H-, C-, and HMBC-NMR showed that α-M was able to form an inclusion complex with γ-CD. The complex yielded an entrapment efficiency of 84.25 and the thermodynamic study showed that the α-M/γ-CD CX was formed spontaneously, based on the negative values of Gibbs energy and ΔH. Interestingly, the solubility of α-M/γ-CD CX significantly increased by 31.74-fold compared with α-M. These results suggest that α-M/γ-CD CX has the potential in the formulation of water-based preparation for clinical applications.
Leverage of Environmental Pollutant Crump Rubber on the Dry Sliding Wear Response of Epoxy Composites
Authors: Shahapurkar Kiran , Chenrayan Venkatesh , Soudagar Manzoore Elahi M. , Badruddin Irfan Anjum , Shahapurkar Pavan , Elfasakhany Ashraf , Mujtaba MA , Siddiqui Md Irfanul Haque , Ali Masood Ashraf , Mahlia Teuku Meurah Indra
Published: August 2021

The effect of crump rubber on the dry sliding wear behavior of epoxy composites is investigated in the present study. Wear tests are carried out for three levels of crump rubber (10, 20, and 30 vol.%), normal applied load (30, 40, and 50 N), and sliding distance (1, 3, and 5 km). The wear behavior of crump rubber–epoxy composites is investigated against EN31 steel discs. The hybrid mathematical approach of Taguchi-coupled Grey Relational Analysis (GRA)—Principal Component Analysis (PCA) is used to examine the influence of crump rubber on the tribological response of composites. Mathematical and experimental results reveal that increasing crump rubber content reduces the wear rate of composites. Composites also show a significant decrease in specific wear values at higher applied loads. Furthermore, the coefficient of friction also shows a decreasing trend with an increase in crump rubber content, indicating the effectiveness of reinforcing crump rubber in a widely used epoxy matrix. Analysis of Variance (ANOVA) results also reveal that the crump rubber content in the composite is a significant parameter to influence the wear characteristic. The post-test temperature of discs increases with an increase in the applied load, while decreasing with an increase in filler loading. Worn surfaces are analyzed using scanning electron microscopy to understand structure–property correlations. Finally, existing studies available in the literature are compared with the wear data of the present study in the form of a property map.
Compressive Properties and Constitutive Model of Semicrystalline Polyethylene
Authors: Zhang Kebin , Li Wenbin , Zheng Yu , Yao Wenjin , Zhao Changfang
Published: August 2021

The mechanical properties of polyethylene (PE) materials are greatly influenced by their molecular structures, environmental temperature, and strain rate. In this study, static and dynamic compression tests were performed on two semicrystalline PE materials—ultrahigh molecular weight polyethylene (UHMWPE) and high-density polyethylene (HDPE). The stress–strain curves of HDPE and UHMWPE under uniaxial compression at temperatures of −40–120 °C and strain rates of 0.001–5500 s−1 were obtained. The research findings suggest that both the UHMWPE and HDPE showed significant strain rate-strengthening effect and temperature-softening effect. In particular, HDPE exhibited better compression resistance and high-temperature resistance. The relationships between the yield stress and temperature and between the yield stress and strain rate for both materials were fitted, and the Cowper–Symonds constitutive model was built while considering the temperature effect. The parameters of the constitutive model were obtained and input into LS-DYNA software to simulate the dynamic compression process of HDPE. The simulation result was consistent with the test result, validating the accuracy of the constitutive parameters.
Mechanical Behaviour of Multifunctional Epoxy/Hollow Glass Microspheres/Paraffin Microcapsules Syntactic Foams for Thermal Management
Authors: Galvagnini Francesco , Fredi Giulia , Dorigato Andrea , Fambri Luca , Pegoretti Alessandro
Published: August 2021

Epoxy/hollow glass microsphere (HGM) syntactic foams (SFs) are peculiar materials developed to combine low density, low thermal conductivity, and elevated mechanical properties. In this work, multifunctional SFs endowed with both structural and thermal management properties were produced for the first time, by combining an epoxy matrix with HGM and a microencapsulated phase change material (PCM) having a melting temperature of 43 °C. Systems with a total filler content (HGM + PCM) up to 40 vol% were prepared and characterized from the mechanical point of view with a broad experimental campaign comprising quasi-static, impact, and fracture toughness tests. The experimental results were statistically treated and fitted with a linear model, to produce ternary phase diagrams to provide a comprehensive interpretation of the mechanical behaviour of the prepared foams. In quasi-static tests, HGM introduction helps to retain the specific tensile elastic modulus and to increase the specific compressive modulus. The brittle nature of HGMs decreases the Charpy impact properties of the SFs, while the PCM insertion improve their toughness. This result is confirmed in KIC and GIC tests, where the composition with 20 vol% of PCM shows an increase of 80% and 370% in KIC and GIC in to neat epoxy, respectively. The most promising compositions are those combining PCM and HGMs with a total particle volume fraction up to 40 vol%, thanks to their optimal combination of thermal management capability, lightness, thermal insulation, and mechanical properties. The ability to fine-tune the properties of the SFs, together with the acquired thermal energy storage (TES) capability, confirm the great potential of these multifunctional materials in automotive, electronics, and aerospace industries.
Recent Trends and Developments in Conducting Polymer Nanocomposites for Multifunctional Applications
Authors: Sharma Shubham , Sudhakara P. , Omran Abdoulhdi A. Borhana , Singh Jujhar , Ilyas R. A.
Published: August 2021

Electrically-conducting polymers (CPs) were first developed as a revolutionary class of organic compounds that possess optical and electrical properties comparable to that of metals as well as inorganic semiconductors and display the commendable properties correlated with traditional polymers, like the ease of manufacture along with resilience in processing. Polymer nanocomposites are designed and manufactured to ensure excellent promising properties for anti-static (electrically conducting), anti-corrosion, actuators, sensors, shape memory alloys, biomedical, flexible electronics, solar cells, fuel cells, supercapacitors, LEDs, and adhesive applications with desired-appealing and cost-effective, functional surface coatings. The distinctive properties of nanocomposite materials involve significantly improved mechanical characteristics, barrier-properties, weight-reduction, and increased, long-lasting performance in terms of heat, wear, and scratch-resistant. Constraint in availability of power due to continuous depletion in the reservoirs of fossil fuels has affected the performance and functioning of electronic and energy storage appliances. For such reasons, efforts to modify the performance of such appliances are under way through blending design engineering with organic electronics. Unlike conventional inorganic semiconductors, organic electronic materials are developed from conducting polymers (CPs), dyes and charge transfer complexes. However, the conductive polymers are perhaps more bio-compatible rather than conventional metals or semi-conductive materials. Such characteristics make it more fascinating for bio-engineering investigators to conduct research on polymers possessing antistatic properties for various applications. An extensive overview of different techniques of synthesis and the applications of polymer bio-nanocomposites in various fields of sensors, actuators, shape memory polymers, flexible electronics, optical limiting, electrical properties (batteries, solar cells, fuel cells, supercapacitors, LEDs), corrosion-protection and biomedical application are well-summarized from the findings all across the world in more than 150 references, exclusively from the past four years. This paper also presents recent advancements in composites of rare-earth oxides based on conducting polymer composites. Across a variety of biological and medical applications, the fact that numerous tissues were receptive to electric fields and stimuli made CPs more enticing.
Characterisation and Modelling of PLA Filaments and Evolution with Time
Authors: Orellana Barrasa Jaime , Ferrández-Montero Ana , Ferrari Begoña , Pastor José Ygnacio
Published: August 2021

The properties of polylactic acid (PLA) filaments have not yet been analysed in detail, and they are strongly affected by the extrusion process used in some additive manufacturing systems. Here we present the mechanical, thermal, physical, and fractographical properties of an extruded filament (not the bulk material or scaffolds), the basic building block of any PLA structure printed via material extrusion. This research aims to create a reference point for the modelisation of additively manufactured structures via extrusion processes, as the main building block is characterised in detail for a deep understanding. Furthermore, we investigated the natural ageing (up to one year), the effect of the printing (extruding) temperature (180 and 190 °C), and the effect of the crosshead speed during the tensile tests (10−1 to 102 mm/min) to provide a deeper analysis of the material. The results showed that the material extruded at 190 °C performed better than the material extruded at 180 °C. However, after one hundred days of natural ageing, both materials behaved similarly. This was related to the flow-induced molecular orientation during the extrusion. The crosshead rate produced a logarithmic increase of the mechanical properties, consistent with the Eyring model. Additionally, the ageing produced significant changes in both the elastic modulus and the yield strength: from 2.4 GPa and 40 MPa, in one-day-aged samples, up to 4 GPa and 62 MPa once entirely aged. Finally, it was observed that the glass transition and the enthalpic relaxation increased with ageing, agreeing with the Kohlraushch–William–Watts model.
Photophysical Properties of the PVK-MEH-PPV/PCBM Composite for Organic Solar Cells Application: Synthesis, Characterization and Computational Study
Authors: Abbassi Faten , Mbarek Mohamed , Almoneef Maha , Alimi Kamel
Published: August 2021

The physical and chemical properties of a new organic composite including PVK-MEH-PPV bi-block copolymer and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were recorded. The functionalization and the charge transfer that occurs between donor and acceptor were examined and computed. In fact, the stationary and time-resolved photoluminescence properties were used to examine the effect of the PCBM on the optical properties of the PVK-MEH-PPV matrix. The photoluminescence quenching accompanied by faster PL decay confirmed the charge transfer and interaction process. The electrical and optoelectronic properties and the charge carriers’ injection in the resulting composite were examined. The experimental conclusion was corroborated and confirmed by a calculation based on density functional theory (DFT). Hence, the combination of experimental and theoretical results indicated that the result composite can be applied as an active layer for organic solar cells.
Polymer Vesicles for Antimicrobial Applications
Authors: Sun Hui , Wang Yin , Song Jiahui
Published: August 2021

Polymer vesicles, hollow nanostructures with hydrophilic cavity and hydrophobic membrane, have shown significant potentials in biomedical applications including drug delivery, gene therapy, cancer theranostics, and so forth, due to their unique cell membrane-like structure. Incorporation with antibacterial active components like antimicrobial peptides, etc., polymer vesicles exhibited enhanced antimicrobial activity, extended circulation time, and reduced cell toxicity. Furthermore, antibacterial, and anticancer can be achieved simultaneously, opening a new avenue of the antimicrobial applications of polymer vesicles. This review seeks to highlight the state-of-the-art of antimicrobial polymer vesicles, including the design strategies and potential applications in the field of antibacterial. The structural features of polymer vesicles, preparation methods, and the combination principles with antimicrobial active components, as well as the advantages of antimicrobial polymer vesicles, will be discussed. Then, the diverse applications of antimicrobial polymer vesicles such as wide spectrum antibacterial, anti-biofilm, wound healing, and tissue engineering associated with their structure features are presented. Finally, future perspectives of polymer vesicles in the field of antibacterial is also proposed.
An Experimental Study on the Dielectric Properties of Rubber Materials
Authors: Chen Hailong , Xu Yudong , Liu Mengqi , Li Tao
Published: August 2021

According to specific formulas, the mixing of rubber samples occurs by two methods: open mixing and internal mixing. The effects of frequency, mixing process, carbon black (CB) content, zinc oxide (ZnO) content, and stearic acid (SA) content on the dielectric properties of rubber materials were studied. The results showed that the effects of the mixing process on the dielectric properties of the rubber samples cannot be ignored, and the appropriate mixing process should be selected when preparing the required rubber materials. The dielectric constant and loss factor of the rubber samples vary depending on the frequency. The dielectric constant had a peak and valley value, while the loss factor only had a peak. The dielectric constant and loss factor of rubber samples were significantly affected by the content of CB, ZnO, and SA. The peak frequency decreased with the increase in CB content, however, the dielectric constant increased with an increase in CB content. The higher the ZnO content, the lower the peak frequency. In addition, the dielectric constant and loss factor increased with an increase in ZnO content. The higher the SA content, the greater the peak frequency. In addition, the dielectric constant and loss factor decreased with an increase in SA content. It is hoped that the experimental results obtained can provide guidance for the study of the dielectric properties, microwave absorption properties, and microwave heating characteristics of rubber polymers.
Plasticized Poly(vinyl chloride) Modified with Developed Fire Retardant System Based on Nanoclay and L-histidinium Dihydrogen Phosphate-Phosphoric Acid
Authors: Sałasińska Kamila , Barczewski Mateusz , Celiński Maciej , Kozikowski Paweł , Kozera Rafał , Sodo Aleksandra , Mirowski Jacek , Zajchowski Stanisław , Tomaszewska Jolanta
Published: August 2021

The current work assessed the burning behavior of plasticized poly(vinyl chloride) (PVC-P) modified with a two-component composition, consisting of L-histidinium dihydrogen phosphate-phosphoric acid (LHP) and nanoclay (n). The thermal and thermodynamical properties of the PVC-P containing from 10 to 30 wt% of the fire retardant system (FRS) were determined by thermogravimetric analysis (TG) as well as by dynamic mechanical thermal analysis (DMTA). In contrast, fire behavior and smoke emission were studied with a cone calorimeter (CC) and smoke density chamber. The research was complemented by a microstructure analysis, using a scanning electron microscope, of the materials before and after burning CC tests. The effects were compared to those achieved for PVC-P, PVC-P with a commercially available fire retardant, the substrate used for the produced LHP, and the mixture of LHP and zinc borate, both of which contained the same share of nanoclay. Based on a notable improvement, especially in smoke suppression suggests that the n/LHP system may be a candidate fire retardant for decreasing the flammability of PVC-P.
Silk-Cellulose Acetate Biocomposite Materials Regenerated from Ionic Liquid
Authors: Rivera-Galletti Ashley , Gough Christopher R. , Kaleem Farhan , Burch Michael , Ratcliffe Chris , Lu Ping , Salas-de la Cruz David , Hu Xiao
Published: August 2021

The novel use of ionic liquid as a solvent for biodegradable and natural organic biomaterials has increasingly sparked interest in the biomedical field. As compared to more volatile traditional solvents that rapidly degrade the protein molecular weight, the capability of polysaccharides and proteins to dissolve seamlessly in ionic liquid and form fine and tunable biomaterials after regeneration is the key interest of this study. Here, a blended system consisting of Bombyx Mori silk fibroin protein and a cellulose derivative, cellulose acetate (CA), in the ionic liquid 1-ethyl-3-methylimidazolium acetate (EMIMAc) was regenerated and underwent characterization to understand the structure and physical properties of the films. The change in the morphology of the biocomposites (by scanning electron microscope, SEM) and their secondary structure analysis (by Fourier-transform infrared spectroscopy, FTIR) showed that the samples underwent a wavering conformational change on a microscopic level, resulting in strong interactions and changes in their crystalline structures such as the CA crystalline and silk beta-pleated sheets once the different ratios were applied. Differential scanning calorimetry (DSC) results demonstrated that strong molecular interactions were generated between CA and silk chains, providing the blended films lower glass transitions than those of the pure silk or cellulose acetate. All films that were blended had higher thermal stability than the pure cellulose acetate sample but presented gradual changes amongst the changing of ratios, as demonstrated by thermogravimetric analysis (TGA). This study provides the basis for the comprehension of the protein-polysaccharide composites for various biomedical applications.
Influence of Low-pH Beverages on the Two-Body Wear of CAD/CAM Monolithic Materials
Authors: Scotti Nicola , Ionescu Andrei , Comba Allegra , Baldi Andrea , Brambilla Eugenio , Vichi Alessandro , Goracci Cecilia , Ciardiello Raffaele , Tridello Andrea , Paolino Davide , Botto Daniele
Published: August 2021

The aim of this in vitro study is to evaluate the effect of different acidic media on volumetric wear and surface roughness of CAD/CAM monolithic materials. Forty-eight rectangular specimens were prepared using different CAD/CAM monolithic materials: nanohybrid composite (Grandio Blocks, Voco), resin-based composite (Cerasmart, GC), lithium disilicate (E-Max, Ivoclar), and high-translucency zirconia (Katana STML, Kuraray Noritake). After storage in distilled water at 37 °C for two days, the specimens were tested using a chewing machine with a stainless-steel ball as an antagonist (49N loads, 250,000 cycles). Testing was performed using distilled water, Coca-Cola, and Red Bull as abrasive media. Wear and surface roughness analyses of the CAD/CAM materials were performed using a 3D profilometer and analyzed with two-way analysis of variance and post hoc pairwise comparison procedures. Worn surfaces were examined using scanning electron microscopy. Resin-based materials suffered higher volumetric wear than ceramics (p = 0.00001). Water induced significantly less volumetric wear than the other tested solutions (p = 0.0014), independent of the material tested. High-translucency zirconia showed less surface roughness than all the other materials tested. The selection of monolithic CAD/CAM materials to restore worn dentition due to erosive processes could impact restorative therapy stability over time. Resin-based materials seem to be more influenced by the acidic environment when subjected to a two-body wear test.
Application of Polydopamine Functionalized Zinc Oxide for Glucose Biosensor Design
Authors: Fedorenko Viktoriia , Damberga Daina , Grundsteins Karlis , Ramanavicius Arunas , Ramanavicius Simonas , Coy Emerson , Iatsunskyi Igor , Viter Roman
Published: August 2021

Zinc oxide (ZnO) nanostructures are widely used in optical sensors and biosensors. Functionalization of these nanostructures with polymers enables optical properties of ZnO to be tailored. Polydopamine (PDA) is a highly biocompatible polymer, which can be used as a versatile coating suitable for application in sensor and biosensor design. In this research, we have grown ZnO-based nanorods on the surface of ITO-modified glass-plated optically transparent electrodes (glass/ITO). Then the deposition of the PDA polymer layer on the surface of ZnO nanorods was performed from an aqueous PDA solution in such a way glass/ITO/ZnO-PDA structure was formed. The ZnO-PDA composite was characterized by SEM, TEM, and FTIR spectroscopy. Then glucose oxidase (GOx) was immobilized using crosslinking by glutaraldehyde on the surface of the ZnO-PDA composite, and glass/ITO/ZnO-PDA/GOx-based biosensing structure was designed. This structure was applied for the photo-electrochemical determination of glucose (Glc) in aqueous solutions. Photo-electrochemical determination of glucose by cyclic voltammetry and amperometry has been performed by glass/ITO/ZnO-PDA/GOx-based biosensor. Here reported modification/functionalization of ZnO nanorods with PDA enhances the photo-electrochemical performance of ZnO nanorods, which is well suited for the design of photo-electrochemical sensors and biosensors.
Postharvest Quality of Cherry Tomatoes Coated with Mucilage from Dragon Fruit and Irradiated with UV-C
Authors: Razali Zuliana , Somasundram Chandran , Nurulain Siti Zalifah , Kunasekaran Wijenthiran , Alias Matthew Raj
Published: August 2021

Cherry tomatoes are climacteric fruits that have a limited shelf life. Over the years, many methods have been applied to preserve the fruit quality and safety of these fruits. In this study, a novel method of combining mucilage from dragon fruits and UV-C irradiation was carried out. Cherry tomatoes were subjected to UV-C irradiation and edible coating, both as a stand-alone and hurdle treatment. The edible coating was prepared from the mucilage of white dragon fruits. Quality parameters including color, weight loss, total soluble solids, titratable acidity, ascorbic acid, antioxidant analysis (total phenolic content and flavonoid content), and microbial analysis were measured throughout 21 days of storage at 4 °C. Results showed that the hurdle treatment extended shelf life by 21 days, reduced weight loss (0.87 ± 0.05%) and color changes (11.61 ± 0.95 ΔE), and inhibited microbes better than stand-alone treatments. Furthermore, fruits treated with the combination of UV-C and edible coating also contained higher total polyphenol content (0.132 ± 0.003 mg GAE/100 mL), total flavonoid content (13.179 ± 0.002 mg CE/100 mL), and ascorbic acid (1.07 ± 0.06 mg/100 mL). These results show that the combination of UV-C and edible coating as a hurdle treatment could be an innovative method to preserve shelf life and quality of fruits.
Knowledge of Antimalarials and Health Seeking Behaviour of Households in Case of Suspected Malaria in Democratic Republic of the Congo
Authors: Ntamabyaliro Nsengi Y. , Burri Christian , Lula Yves N. , Ishoso Daniel , Engo Aline B. , Ngale Mireille A. , Liwono Jerry Y. , Mukomena Eric S. , Mesia Gauthier K. , Mampunza Samuel M. , Tona Gaston L.
Published: August 2021

(1) Background: The Democratic Republic of the Congo (DRC) is heavily affected by malaria despite availability of effective treatments. Ignorance and unrecommended behaviour toward a suspected malaria case in households may contribute to this problem. (2) Method: In communities of one rural and one urban Health Centres in each of the 11 previous provinces of DRC, all households with a case of malaria in the 15 days prior to the survey were selected. The patient or caregiver (responder) were interviewed. Logistic regression was used to assess predictors of knowledge of recommended antimalarials and adequate behaviour in case of suspected malaria. (3) Results: 1732 households participated; about 62% (1060/1721) of the responders were informed about antimalarials, 70.1% (742/1059) knew the recommended antimalarials and 58.6% (995/1699) resorted to self-medication. Predictors of knowledge of antimalarials were education to secondary school or university, information from media and smaller households. Predictors of good behaviour were Catholic religion and smaller households. Receiving information from Community Health Workers (CHWs) failed to be determinants of knowledge or adequate behaviour. (4) Conclusion: malaria control in DRC is hampered by ignorance and non-adherence to national recommendations. These aspects are influenced by unsuccessful communication, size of households and level of education.
First record of Spotted Small Flat Sarangesa purendra (Moore, 1882) (Lepidoptera: Hesperiidae) from Union Territory of Jammu and Kashmir, India
Authors: Gupta Sanjeev , Sheikh Taslima
Published: August 2021

The Spotted Small Flat Sarangesa purendra (Moore, 1882) is a new addition to the butterfly checklist of Jammu and Kashmir Union Territory, India. This species is sighted on 02 June 2019, in Dewal area of Billawar while observing the different pollinators by first author. Now on addition of this species Jammu and Kashmir has now total 309 species of butterflies
Pengaruh Mineral Nutrisi Nitrogen dan Besi Terhadap Sifat Fisiologis dan Pertumbuhan Tanaman Terong Lokal Buton (Solanum Melongena L)
Authors: Aliyaman Aliyaman
Published: August 2021

Penelitian ini bertujuan untuk mengetahui pengaruh mineral nitrogen dan besi terhadap sifat fisiologis dan pertumbuhan tanaman terong lokal buton (solanum melongena L). Penelitian ini dilakukan dengan menggunakan Rancangan Acak Lengkap (RAL) faktor tunggal. Perlakuan berupa pemupukkan dengan membuat larutan Hoagland sebanyak tiga jenis yaitu larutan lengkap, larutan tanpa N, larutan N tiga kali, larutan tanpa Fe, dan larutan Fe tiga kali. Masing-masing perlakuan diulang tiga kali dengan 5 tanaman tiap ulangan. Analisis data pengamatan menggunakan analisis sidik ragam. Apabila ditemukan beda nyata diantara perlakuan maka dilanjutkan dengan uji Duncan’s Multiple Range Test (DMRT). Hasil penelitian menunjukkan bahwa perlakuan nutrisi dengan beda komposisi serta tingkat dosis berpengaruh terhadap sifat fisiologis tanaman terong lokal buton seperti tinggi tanaman, kandungan klorofil, aktivitas nitrat reduktase dan nisbah luas daun. Secara keseluruhan, perlakuan nutrisi 3 Fe lebih baik dibandingkan dengan perlakuan nutrisi lainnya, yang disebabkan oleh tanaman terong lokal buton masih toleran terhadap penambahan perlakuan Fe.
Diagnosing Hematological Disorders Using Deep Learning Method
Authors: KARAGÜL Tuba , YURTAY Nilüfer , ÖNEÇ Birgül
Published: August 2021

Deciding on the diagnosis of the disease is an important step for treating the patients. Also, the numerical value of blood tests, the personal information of patients, and most importantly, an expert opinion is necessary to diagnose a disease. With the development of technology, patient-related data are obtained both rapidly and in large sizes. Deep learning methods, which can produce meaningful results by processing the data in raw form, are beginning to give results that are close to human opinion nowadays. The present work is aimed to develop a system that will enable the diagnosis of anemia in general practice conditions due to the increasing number of patients and the intention of the hospitals, as well as the difficulties in reaching the expert medical consultant. The main contribution of this work is to make a diagnosis like a doctor with the data as the way the doctor uses it. The data set was obtained from the actual hospital environment and no intervention, such as increasing or decreasing the number of data, increasing or decreasing the number of attributes, reduction, integration, imputation, transformation, or discretization, has been made on the incoming patient data. The original hospital data are classified for the diagnosis of anemia types and the accuracy of 84,97% achieved by using a deep learning algorithm.
Technogenic Impact of the Urals Mining Works upon the Hydrosphere Status
Authors:   Rybnikova L.S.
Published: August 2021

Issues of the mining region hydrosphere formation have been considered. Significance of surface waters hidden (latent) pollution has been demonstrated, its role increases after mines’ liquidation (wet closing-down), especially at small river catchments. Quantitative assessment of technogenic mass-transfer scale has been performed, the scheme of the mining territory hydrosphere quality formation has been developed.
Resource Assessment of “Pasvik” Natural Reserve (Murmansk Oblast) Phytophagous Water Birds Forage Grounds in Terms of Aquatic Plants Biomass.
Authors:   Kirillova N.R.
Published: August 2021

“Pasvik” Natural Reserve first-order consumers (water birds) and producers (aquatic plants) trophic connections have been identified. Amount of aquatic plants raw biomass has been assessed on average, in terms of the projective coverage classes in phytocenosis, and resource-significant species if aquatic flora have been identified.
Studying of Heavy Metals (Copper and Cadmium) Interactions with Biomass of the Bryophyte-cyanobacteria Community
Authors:   Zhbanov A.E., Ostroumov S.A.
Published: August 2021

Using the method of atomic absorption spectrometry (AAS), the concentrations of some elements (Cu, Cd, Fe, Mn, Pb, Ni, and As ) were measured in the biomass of a bryophyte OST-1 with cyanobacteria (Phormidium sp., Oscillatoria sp.) community after its incubation in aquatic medium with added Cu (4 mg/L) and Cd (0,01 mg/L). Fe, Mn, Pb, Ni, and As were not added to the aquatic medium. It was found that after the incubation the concentrations of Cu and Cd increased. The concentrations of Fe, Mn, Pb, Ni, and As in the biomass did not change in the course of the incubation of the biomass. The results contribute to the scientific basis for developing phytoremediation.
Short-term Forecasting of the Kursk Territory Flooding during the Spring Flood Period
Authors:   Kumani M.V., Apukhtin A.V.
Published: August 2021

The article examines the possibility of short-term forecasting of water levels and dates of their occurring during a spring flood period and flooding of vast developed territories of the city of Kursk. An algorithm and major dependencies for the shortterm forecast of runoff under the conditions of the great infl ow and with the account of bed processes have been given. Conclusions on the possibility of application in the given conditions of the forecasting methods depicting the high water wave formation in the generalized view have been made.
Inundation Risk: Assessment and Mapping Methods
Authors:   Shalikovskiy A.V.
Published: August 2021

The paper characterizes various approaches to the inundation risk assessment, namely: probabilistic, numerical, via the value of mean-year or maximal damage, or mathematical expectance of harm. Particular cases of mathematical expectance of harm calculation and territories zoning in the appropriate indicators have been considered.
Conceptual Approaches to Application of Hydro Power Potential of Small Rivers of Russia
Authors:   Malik L.K.
Published: August 2021

Possibilities of small hydro power stations establishment on small rivers have been considered with taking into account their economic and social/ecological advantages, safety and a number of factors that makes their operation more difficult. The Conceptual Scheme of Small Hydro Power Industry Development by the author is presented; its blocks contain measures and recommendations required in the process of designing and construction of small hydro power stations. Main tasks concerning small hydro power stations establishment have been stated.
Conditioning of Excessive Activated Sludge Contaminated with Heavy Metals by Means of Water Air Vegetation
Authors:   Asonov A.M., Kirillov M.V., Denisov S.E.
Published: August 2021

One of the options for the problem of utilization of urban aeration stations activated sludge contaminated by heavy metals ions has been considered. The idea of the precipitate conditioning stipulating its detoxication with supreme water-air vegetation, common reed grass, in particular, has been proposed. Objects and methods of investigation have been described, and the investigation outcomes have been quoted.
Kinetics of Cu 2+ Copper Sorption from Water Systems by Modified Aluminum Silicates
Authors:   Khuramshina I.Z., Nikiforov A.F., Kutergin A.S., Popov A.N., Rybakov Y.S.
Published: August 2021

Regent methods of natural sorbents modification on the basis of opal/ cristobalite rocks have been developed. Optimal reagents for the natural sorbents modification are solutions of sodium hydroxide and sodium chloride. Kinetics of Cu2+ copper extraction from water systems with the modified sorbents has been studied in different conditions: depending on the velocity of stirring, sorbent particle size, and the extracted metal concentration. The conducted research enables to recommend the modified sorbents on the basis of opal/cristobalite rocks for extraction of heavy metals from water systems.
Numerical Stochastic Models of Meteorological Processes and Fields and Some of their Applications
Authors:   Ogorodnikov V.A., Kargapolova N.A., Basova K.V., Ilyina A.A., Sereseva O.V.
Published: August 2021

This article is devoted to development of numerical stochastic models of real meteorological processes and fields and to investigation of different properties of extreme meteorological events on the basis of the established models.
Application of Deterministic-stochastic Simulation for Frequency Curves Estimation: the Pasha River (Russia) as a Case Study
Authors:   Zhuravlev S.A.
Published: August 2021

An approach that combines runoff model & stochastic weather generator in order to get the coordinates of yearly, monthly, daily, maximal & minimal runoff frequency curves is considered. The distributed hydrological model “Hydrograph” and stochastic weather generator were applied to the catchment of the Pasha River (5710 km2) located in the Northwest Russia. The frequency curves are compared with analogous ones that have been built on the basis of the long-term runoff observations.
Estimation of the Volga Water-Divider Operation Impact on Runoff Distribution among the Volga Delta Branches
Authors:   Krasnozhon G.F., Shatalova K.Y.
Published: August 2021

The present work is devoted to questions of the water-divider system application in the Volga River delta. Assessment of the water divider operation impact on runoff in the Buzan and Volga branches has been carried out both with conventional methods and with computations on the lower Volga hydro-dynamic model. High academic value of the paper has been determined by the right selection of all the hydro-dynamic model parameters in the conditions of insufficiency of the needed data on the flood regime.
River Runoff Parameters’ and Fractiles’ Assessment in the Conditions of Considerable Within-Year Transformation
Authors:   Krasov V.D.
Published: August 2021

Particular qualities of the runoff characteristics statistic assessments in the conditions of the runoff non-stationary within-year withdrawal have been studied. It has been shown that the within-year withdrawal patterns substantially affect the runoff characteristics being assessed. Some recommendations on assessment of the runoff characteristics in the conditions of the runoff non-stationary within-year withdrawal have been proposed.
Urea Influence on the Photosynthetic Pigments Content and Urease Activity in Elodea Leaves
Authors:   Maleva M.G., Borisova G.G., Chukina N.V., Nekrasova G.F.
Published: August 2021

Ecological aspects of urea influence on hydro/cenosis condition and hydrocoles functioning have been discussed. In model conditions the Elodea hatching in the urea presence has shown that the urea low concentrations stimulate the photosynthetic pigments accumulation and promote the urease ferment performance while the higher concentrations suppress these processes. The necessity of controlling the urea and other nitrogen-containing compounds flows to water bodies has been substantiated.
Statics of Cu2+ Sorption from Water Systems with Modified Aluminum Silicates
Authors:   Khuramshina I.Z., Nikiforov A.F., Kutergin A.S.
Published: August 2021

Parameters of water system purification sorption processes in terms of Cu2+ with a natural aluminum silicate and its modified forms have been stated. Nature of sorbate and sorbent interaction has been identified. Optimal conditions for Cu2+ reduction have been found. Principal possibility to use modified aluminum silicates for water systems treatment has been demonstrated.
Nonlinear Model of River Runoff Fluctuations with Chaotic Regimes
Authors:   Shveykina V.I., Kozhevnikova I.A.
Published: August 2021

It is shown, that a loss of stability and a birth of a limiting cycle come into existence when only two variables (water resources, runoff) and the equations in the simplest form are exploited. Speed of evaporation is chosen as a managing parameter. Upon the influence of external force and the certain interval of values of the evaporation speed in the system chaotic regimes are established. The opportunity of occurrence of chaotic regimes in fluctuations of some concrete rivers is confirmed by values of the chaos diagnostic characteristics designed for them.
Present-day Specific Features of the Channel Morphology and Ice-jam Formation at the Tom’ River
Authors:   Agafonova S.A., Berkovich K.M., Ruleva S.N., Surkov V.V., Frolova N.L.
Published: August 2021

Features of present-day channel deformations of the Tom' River within the Tomsk region and related processes of the ice jams’ formation have been considered. Recommendations about prevention of their negative consequences have been offered. They include organizational, scientific/information and engineering measures of the damages prevention against dangerous hydrological processes under consideration.
Results of the Ce-Qual-W2 v.3.2 Hydrodynamics and Water Quality Model Application with an Automated Bathymetry File Generation for the Numerical Reproduction of Hydrodynamic Variables of the Severnaya Sosva River Section
Authors:   Pushistov P.Y., Danchev V.N., Romanenko R.D.
Published: August 2021

The paper describes the results of the development and verification of an information/computing system based on the model of hydrodynamics and water quality CE-QUAL-W2 v. 3.2 and watershed modeling system (WMS) for the numerical description of the hydrodynamic variables of the Severnaya Sosva River section; a basin of which will be the main object of technogenic load during implementation of “Industrial Ural – Polar Ural” mega-project.
Enhancement of Effectiveness of Groundwater Use for the Rural Population Domestic Water Supply and Agro/industrial Complex Water Supply
Authors:   Rybina N.N., Isayeva S.D.
Published: August 2021

The paper has been considered the current situation with the national water resources state and use, in particular, concerning agricultural water supply, general system problems of groundwater use and practical measures necessary for their solution.
Study of Within-year Changes of Hydrocoles Composition in Aeration Tanks in the Process of Waste Water Treatment
Authors:   Dregulo A.M.
Published: August 2021

Activated sludge micro/organisms classes’ composition has been studied in the annual regime of biological facilities operation. Dependence of heavy metals concentration influence on the hydrocoles’ composition has been shown.
Alteration of Bivalve Mollusks State Physiological Indicators in Assessment of Water Pollution with Oil Products
Authors:   Rubets K.I.
Published: August 2021

Oil product water-soluble fraction influence on physiological indicators of large bivalve mollusks has been studied. Possibility to use the mollusks for the water pollution monitoring purposes has been demonstrated.
ABOUT REGENERATION OF ALIEN POLYCHAETE POLYDORA WEBSTERI (ANNELIDA: SPIONIDAE)
Authors: Lisitskaya E. V. , Boltachova N. A.
Published: August 2021

New data on the regenerative capacity of the invader polychaete Polydora websteri Hartman in Loosanoff & Engle, 1943 have been obtained. The material was collected in 2019-2020 in the area of Sevastopol. Polychaetes were extracted from blisters in the valves of an exotic oyster species for the Black Sea - Crassostrea gigas (Thunberg, 1793). Molluscs were grown on an oyster farm. Polychaetes were kept in aquariums with filtered seawater at a temperature from 8.8 to 25.8 °C and a salinity of 17.5-17.8‰. Under laboratory conditions, body segments were removed from the worms and their recovery was observed. It was found that P. websteri regenerated both the anterior and posterior parts of the body. The minimum number of segments capable to simultaneously restore both anterior and posterior regions is three mid-body segments. The regeneration process in P. websteri depends significantly on the water temperature. In the range of 8.8-26 °С, a direct relationship was established between the water temperature and the number of regenerated individuals. An inverse relationship was found between the water temperature and the time spent on regenerating the lost fragments. When warming up the water, the proportion of regenerated P. websteri increased from 15 to 87%, and the duration of regeneration decreased 2.5 times.
ALIEN PLANT SPECIES IN THE RUSSIAN ARCTIC: SPATIAL PATTERNS, CORRIDORS AND LOCAL INVASIONS
Authors: Morozova O. V. , Tishkov A. A.
Published: August 2021

The article analyzes the diversity of alien plant species in the Russian part of the Arctic (RA) based on the generalization of different publications. Alien plant species present in all regions of the RA, but compared with more southern biomes, their share in regional floras is relatively small and unevenly distributed, from 1-2% in the north of Yakutia and in the continental part of Chukotka to 22-27% on the Kola Peninsula and in the Bolshezemelskaya tundra. In general, the low species diversity of alien species in the RA is explained by two groups of factors. The first one includes socio-economic indicators: relatively late and still focal economic development of the region and, in general, low human migration activity here. The second one unites natural factors, among which the climate is of paramount importance. It has been shown that mainly plurizonal species with the northern border of their ranges in the boreal zone are introduced into the RA, but the direct donor regions are often not known when alien species are introduced. These species are clearly better adapted to a wide range of conditions, allowing them to survive in the harsh Arctic climate. By the way of invasion into the RA, unintentionally introduced species prevail, and the main vectors are transport, migration activity, in recent years - arctic tourism, as well as introduction with contaminated materials. The distribution of alien species is locally and mostly associated with settlements and industrial centers.
Pelatihan Zoom Meetings dan Streaming Youtube untuk Pengembangan Komunitas Ngaji Online
Authors:   Fakultas Ilmu Sosial, Universitas Negeri Jakarta, Jakarta Timur, Romli Nada Arina , Safitri Dini ,   Fakultas Ilmu Sosial, Universitas Negeri Jakarta, Jakarta Timur, Nurpratiwi Suci ,   Fakultas Ilmu Sosial, Universitas Negeri Jakarta, Jakarta Timur, Hakim Lukman ,   Fakultas Ilmu Sosial, Universitas Negeri Jakarta, Jakarta Timur
Published: August 2021

Abstract Purpose: This community service aims to improve skills and provide knowledge for majelis taklim members about using Zoom meeting for the virtual event and broadcasting virtual events through Youtube streaming service in Malaka Jaya District, Jakarta City. Method: This community service applied an interactive method with survey location, finding community problems with interview methods and training methods to provide knowledge and improve the majelis taklim community of Malaka Jaya District, Jakarta City. Results: Organizing online meetings with Zoom meetings can provide solutions to majelis taklim community during the Covid-19 pandemic, where the implementation of studies can still be held without face-to-face. It supports government movements to prevent the transmission of the Covid-19 virus. In addition, broadcasting a study event by streaming on a Youtube channel can have a broad impact on the general public. Conclusion: Training on Zoom meetings and Youtube streaming can develop a wider online islamic learning community.
Attribute-Based Encryption for Access Control in Cloud Ecosystems
Authors: bartolomeo giovanni
Published: August 2021

We introduce a distributed, fine-granuled,
policy-based resource access control protocol leveraging on Attribute-Based
Encryption. The protocol secures the whole access control procedure from the
authorization issuer to the resource server providing grant confidentiality,
proof of possession, antiforgery and may be implemented through a developer
familiar web token exchange flow plus a HTTP basic authentication flow. As
such, it may map to Cloud computing SaaS paradigm, enabling microservices
integration into a single, authorization-centric digital ecosystem, even across
multiple identity domains. We also present the results of a performance
evaluation on a first prototype implementation.