jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Ginny Boehme | Alex McAllister | Thomas R Caswell | Kyle Denlinger | Michael A. Flierl | Anita R Hall | Cindy Li | Brian Quigley | Minglu Wang | Andrew Wesolek
Source: University of North Florida Digital Commons (University of North Florida) (article, 2021-01-01)
Field: Materials Science — Materials Chemistry

ACRL 2021 Environmental Scan Every other year, the ACRL Research Planning and Review Committee provides a scan of higher education, detailing the current environment and its anticipated impact on libraries. While this year's Environmental Scan is no different in terms of scope, we are now facing challenges to higher education on a scale not seen in decades. Across the globe, the COVID-19 pandemic has disrupted the lives and livelihoods of millions of people, and in the United States, this disruption has been compounded by the eruption of protests surrounding civil rights and other social justice issues.\nWhile the 2021 Environmental Scan covers developments over the last two years (2019 and 2020), the events of 2020 are anticipated to have lasting repercussions, and, while not the primary focus, are a common thread throughout the document. Political science Electronic and Structural Properties of Oxides ; Ga2O3 and related materials ; Advanced MEMS and NEMS Technologies
Authors: B S Lokasree
Source: Türk bilgisayar ve matematik eğitimi dergisi (article, 2021-04-11)
Field: Chemistry — Analytical Chemistry

Data Analysis and Data Classification in Machine Learning using Linear Regression and Principal Component Analysis In this paper step-by-step procedure to implement linear regression and principal component analysis by considering two examples for each model is explained, to predict the continuous values of target variables. Basically linear regression methods are widely used in prediction, forecasting and error reduction. And principle component analysis is applied for facial recognition, computer vision etc. In Principal component analysis, it is explained how to select a point with respect to variance. And also Lagrange multiplier is used to maximize the principle component function, so that optimized solution is obtained Principal component analysis ; Lagrange multiplier ; Principal component regression ; Computer science ; Component analysis ; Component (thermodynamics) ; Linear regression ; Regression analysis ; Artificial intelligence ; Proper linear model ; Regression ; Pattern recognition (psychology) ; Machine learning ; Mathematics ; Polynomial regression ; Statistics ; Mathematical optimization Spectroscopy and Chemometric Analyses
Authors: Mukhtar Mukhtar | Majid Khan Majahar Ali | Anam Javaid | Mohd Tahir Ismail | Ahmad Fudholi
Source: Mathematical Modelling and Engineering Problems (article, 2021-08-31)
Field: Chemistry — Analytical Chemistry

Accurate and Hybrid Regularization - Robust Regression Model in Handling Multicollinearity and Outlier Using 8SC for Big Data Regressions have been continuously received great attention. However, there are still open issues in regression, and two of the issues is regression with multicollinearity and outlier. Regularization (Ridge, Lasso, and Elastic Net) techniques implement a means to control regression coefficients. The methods can decrease the variance and reduce our sample error for tackle multicollinearity. In robust regression, it is a form of regression method designed to overcome outliers. Robust regression is an important method for analyzing data that are infected with outliers. The data have been interacted on the second order interaction. The data contained 435 different independent interaction variables. The primary focus of this paper is to analyze and compare the impact of three different variable selection techniques regularization regression algorithms for the data seaweed drying. After that, it will be analyzed through robust regression (Tukey Bi-Square, Hampel, and Huber). As the result, the Lasso-Hampel was better than others with the MAE (4.09641), RMSE (5.275992), MAPE (7.9962), SSE (182491.2), R-square (0.6514791), and R-square Adjusted (0.649279). The method of Lasso-Hampel is able to be relied on investigation of the accuracy in big data obtained from regularization and robust regression. Multicollinearity ; Outlier ; Statistics ; Variance inflation factor ; Regression analysis ; Elastic net regularization ; Regression ; Lasso (programming language) ; Mathematics ; Linear regression ; Robust regression ; Regression diagnostic ; Mean squared error ; Computer science ; Econometrics ; Polynomial regression Spectroscopy and Chemometric Analyses ; Global Trade and Competitiveness ; Advanced Statistical Methods and Models
Authors: Deniz Mutlu
Source: TEKSTİL VE KONFEKSİYON (article, 2021-03-16)
Field: Materials Science — Polymers and Plastics

An Experimental Study on Selected Performance Properties of 100% Cotton Terry Fabrics This paper presents an experimental study of the selected performance properties of 100% cotton terry fabrics. In this study, nine different constructions of terry fabrics are woven with Ne 12/1, Ne 16/1 and Ne 20/1 100% carded cotton ring spun weft yarns in three different weft densities. Fabric samples are subjected to 5 washing cycles before undergoing the tests; air permeability, resistance to pile loop extraction, bursting strength, tensile strength, tear strength, abrasion resistance, static water absorption and drying rate. Experimental results were analyzed using General Linear Model Analysis, Correlation Analysis and Paired-Samples T Test Analysis. According to results, weft yarn count is effective on air permeability, resistance to pile loop extraction, bursting strength, tensile strength, tear strength, mass loss ratio and static water absorption and weft density is effective on air permeability, resistance to pile loop extraction (15, 20 and 25 mm pulling distances), bursting strength, tensile strength, tear strength, mass loss ratio and remaining water ratio. The statistical evaluations demonstrate that repeated launderings also effect the performance properties of woven terry fabrics. Ultimate tensile strength ; Air permeability specific surface ; Materials science ; Composite material ; Tear resistance ; Absorption of water ; Bursting Textile materials and evaluations ; Dyeing and Modifying Textile Fibers ; Natural Fiber Reinforced Composites
Authors: Ewa Witczak | Izabela Jasińska | Iwona Krawczyńska
Source: Materials (article, 2021-03-09)
Field: Materials Science — Polymers and Plastics

The Influence of Structure of Multilayer Woven Fabrics on Their Mechanical Properties Multilayer woven fabrics used for conveyor belts must be characterized by high mechanical strength. The design process of multilayer woven fabrics for such application requires taking into account the structural characteristics of the fabric, which allows to adjust the final product properties to the dedicated use. The geometry of warp threads-means stuffer and binding is the decisive aspect, which influences the strength properties of multilayer woven fabrics and materials made with their use as well. The aim of this work was to examine the possibility of shaping mechanical strength and bending rigidity of multilayer woven fabrics by changing the order of introducing weft threads into individual layers. The eight variants of multilayer woven fabrics were manufactured using laboratory harness loom. They were produced using different structural models in two weft variants, then tested. The mechanical features were determined, such as breaking force, recovered and unrecovered elongations in cyclic tensile test, stiffness rigidity. The analysis of the obtained results confirmed, that both the model and the order in which the weft threads were introduced into individual layers influence the mechanical strength and bending rigidity of multilayer woven. It was found, that the strength properties characterized by the above mentioned indicators are influenced by the number of threads weaved as both the stuffer and binding warp. Flexural rigidity ; LOOM ; Ultimate tensile strength ; Composite material ; Rigidity (electromagnetism) ; Stiffness ; Materials science ; Woven fabric ; Bending ; Structural engineering ; Thread (computing) ; Breaking strength ; Bending stiffness ; Tensile testing ; Mechanical engineering ; Engineering Textile materials and evaluations ; Belt Conveyor Systems Engineering ; Innovations in Concrete and Construction Materials
Authors: Pascal Bellon | Qun Li
Source: Acta Materialia (article, 2021-06-03)
Field: Materials Science — Materials Chemistry

Anisotropic Cahn-Hilliard free energy and interfacial energies for binary alloys with pairwise interactions Anisotropy ; Materials science ; Binary number ; Lattice (music) ; Monte Carlo method ; Condensed matter physics ; Tensor (intrinsic definition) ; Statistical physics ; Surface energy ; Ternary operation ; Thermodynamics ; Physics ; Quantum mechanics ; Geometry ; Mathematics Solidification and crystal growth phenomena ; nanoparticles nucleation surface interactions ; High Temperature Alloys and Creep
Authors: Rosa Devesa‐Rey | J. del Val | Jorge Feijoo | José P. González-Coma | G. Castiñeira | Lorena González-Gil
Source: Water (article, 2021-08-30)
Field: Materials Science — Materials Chemistry

Preparation of Synthetic Clays to Remove Phosphates and Ibuprofen in Water The main objective of this study consists in the synthesis of a layered double hydroxide (LDH) clay doped with magnesium and aluminum in order to test the removal of phosphates and ibuprofen in water. Two different LDH composites are assessed: oven-dried (LDHD) and calcined (LDHC). Single adsorptions of phosphate and ibuprofen showed up to 70% and 58% removal in water, when LDHC was used. A poorer performance was observed for LDHD, which presented adsorption efficiencies of 52% and 35%, respectively. The simultaneous removal of phosphate and ibuprofen in water showed that LDHC allows a greater reduction in the concentration of both compounds than LDHD. Phosphate adsorption showed a close agreement between the experimental and theoretical capacities predicted by the pseudo-second-order model, whereas ibuprofen fitted to a first-order model. In addition, phosphate adsorption showed a good fit to an intraparticle diffusion model and to Bangham model suggesting that diffusion into pores controls the adsorption process. No other mechanisms may be involved in ibuprofen adsorption, apart from intraparticle diffusion. Finally, phosphate desorption could recover up to 59% of the initial concentration, showing the feasibility of the recuperation of this compound in the LDH. Ibuprofen ; Chemistry ; Adsorption ; Phosphate ; Hydroxide ; Calcination ; Diffusion ; Desorption ; Nuclear chemistry ; Inorganic chemistry ; Chromatography ; Organic chemistry ; Catalysis Layered Double Hydroxides Synthesis and Applications ; Phosphorus and nutrient management ; Adsorption and biosorption for pollutant removal
Authors: Fang Ruan | Sakiko Kawanishi | Sohei Sukenaga | Hiroyuki Shibata
Source: Metallurgical and Materials Transactions B (article, 2021-02-18)
Field: Materials Science — Biomaterials

Effect of the Silicate Skeleton Structure on the Dissolution Kinetics of Calcium Silicate Mineral Phases in Water Dissolution ; Calcium silicate ; Silicate ; Chemistry ; Kinetics ; Silicate minerals ; Elution ; Wollastonite ; Calcium ; Leaching (pedology) ; Analytical Chemistry (journal) ; Mineral ; Mineralogy ; Inorganic chemistry ; Chemical engineering ; Chromatography ; Geology ; Physical chemistry Clay minerals and soil interactions ; CO2 Sequestration and Geologic Interactions ; Concrete and Cement Materials Research
Authors: Zhiwei Chen | Yu Liu | Weihua Li | Honglai Liu
Source: Chemical Engineering Science (article, 2021-11-11)
Field: Materials Science — Materials Chemistry

Development of a BV-TDDFT model for metal corrosion in aqueous solution Corrosion ; Time-dependent density functional theory ; Aqueous solution ; Metal ; Polarization (electrochemistry) ; Diffusion ; Density functional theory ; Materials science ; Ionic bonding ; Electrochemistry ; Thermodynamics ; Chemical physics ; Chemistry ; Ion ; Computational chemistry ; Physical chemistry ; Metallurgy ; Electrode ; Organic chemistry ; Physics Corrosion Behavior and Inhibition ; Hydrogen embrittlement and corrosion behaviors in metals ; Concrete Corrosion and Durability
Authors: Thi Tuong An Tran | Huynh Thanh Linh Duong | Thuy‐Phuong T. Pham | Tri Nguyen | Thị Dung Nguyễn | Boi An Tran
Source: Adsorption Science & Technology (article, 2021-01-01)
Field: Materials Science — Materials Chemistry

Preparation of Magnetic Composite Polyaniline/Fe<sub>3</sub>O<sub>4</sub>−Hydrotalcite and Performance in Removal of Methyl Orange Magnetic composite fabricated from polyaniline and Fe 3 O 4 -hydrotalcite (Pan/MHT) was successfully applicated for removal of methyl orange (MO) from wastewater. The structure and properties of Pan/MHT were characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, vibrating sample magnetometer, and Brunauer-Emmett-Teller adsorption isotherm. Adsorption kinetic results indicated that the adsorption process followed pseudosecond-order kinetic model ([Formula: see text]), MO adsorption onto Pan/MHT was well described by Freundlich isotherm ([Formula: see text]), and the MO adsorption capacity of 2 Pan/MHT obtained the highest with [Formula: see text]. Batch adsorption experiments were carried out using magnetic composite with the effects of initial MO concentration, solution pH, and adsorbent dosage. The results revealed that the magnetic Pan/MHT exhibited efficient adsorption of MO in the aqueous solution as a result of the affinity for organic dyes, microporous structure, and suitable surface area for adsorption (15,460 m 2 /g). The superparamagnetic behavior of Pan/MHT (with[Formula: see text], [Formula: see text], and[Formula: see text]) helps that it could be separated from the solution and performs as an economical and alternative adsorbent to removal and degrade azo dye from wastewater. Pan/MHT was also investigated to reuse after desorption of MO in 0.1 M HCl, and the results show that 2 Pan/MHT can be reused for 4 cycles with [Formula: see text] Adsorption ; Freundlich equation ; Methyl orange ; Nuclear chemistry ; Chemistry ; Hydrotalcite ; Aqueous solution ; Fourier transform infrared spectroscopy ; Analytical Chemistry (journal) ; Chemical engineering ; Organic chemistry Layered Double Hydroxides Synthesis and Applications ; Adsorption and biosorption for pollutant removal ; Nanomaterials for catalytic reactions
Authors: Maria Kupczak | Anna Mielańczyk | Dorota Neugebauer
Source: Materials (article, 2021-03-08)
Field: Materials Science — Biomaterials

PDMAEMA/Polyester Miktopolymers: Synthesis via In-Out Approach, Physicochemical Characterization and Enzymatic Degradation Synthesis, physicochemical characterization, and the enzymatic degradation of the amphiphilic miktoarm star-shaped polymers is reported herein. First, star-shaped macroinitiators, based on <i>N,N</i>'-dimethylaminoethyl methacrylate (DMAEMA) and glycerol dimethacrylate (GDMA) ((PDMAEMA)<sub>n</sub>-PGDMA), were synthesized. Due to the presence of hydroxyl groups in the macroinitiator core, polyesters such as poly(ɛ-caprolactone) (P(ɛ-CL)), polylactide (PLA) and poly(lactide-<i>co</i>-glycolide) (PLGA) were synthesized using ring opening polymerization (ROP). Comprehensive degradation studies on enzymatic degradation, using a lipase from <i>Pseudomonas cepacia</i>, were performed. Enzymatic degradation was monitored by weight measurements and nuclear magnetic resonance spectroscopy (<sup>1</sup>H NMR). The fastest degradation rate was observed for the polymer with the lowest molecular weight. Amphiphilic miktopolymers may find application as biomaterials for long- or mid-term period drug-delivery systems. Polyester ; Polymer chemistry ; Methacrylate ; Amphiphile ; Ring-opening polymerization ; Lipase ; Degradation (telecommunications) ; Materials science ; Polymer ; Polymerization ; Biodegradable polymer ; Biodegradation ; Chemistry ; Organic chemistry ; Copolymer ; Enzyme biodegradable polymer synthesis and properties ; Advanced Polymer Synthesis and Characterization ; Graphene and Nanomaterials Applications
Authors: Ana P. S. Koltun | E. K. Lenzi | Marcelo Kaminski Lenzi | Rafael S. Zola
Source: Fractal and Fractional (article, 2021-10-25)
Field: Materials Science — Materials Chemistry

Diffusion in Heterogenous Media and Sorption—Desorption Processes We investigate particle diffusion in a heterogeneous medium limited by a surface where sorption–desorption processes are governed by a kinetic equation. We consider that the dynamics of the particles present in the medium are governed by a diffusion equation with a spatial dependence on the diffusion coefficient, i.e., K(x) = D|x|−η, with −1 &lt; η and D = const, respectively. This system is analyzed in a semi-infinity region, i.e., the system is defined in the interval [0,∞) for an arbitrary initial condition. The solutions are obtained and display anomalous spreading, that is, the dynamics may be viewed as anomalous diffusion, which in turn is related, and hence, the model can be directly applied to several complex systems ranging from biological fluids to electrolytic cells. Sorption ; Diffusion ; Desorption ; Anomalous diffusion ; Thermodynamics ; Effective diffusion coefficient ; Chemical physics ; Diffusion equation ; Particle (ecology) ; Chemistry ; Physics ; Materials science ; Physical chemistry ; Adsorption ; Innovation diffusion ; Computer science Material Dynamics and Properties ; Electrostatics and Colloid Interactions ; Fractional Differential Equations Solutions
Authors: Anthony Blanchard | Fabrice Gouanvé | Éliane Espuche
Source: Polymers (article, 2021-10-14)
Field: Materials Science — Polymers and Plastics

Influence of the Graphene Filler Nature on the Morphology and Properties of Melt Blended EVOH Based Nanocomposites In this study, ethylene vinyl alcohol (EVOH) nanocomposites elaborated by melt blending with four different fillers were investigated. Two graphene and two graphite fillers displaying various shapes were selected. The morphology, microstructure, thermal, mechanical, and barrier properties of the nanocomposite films prepared for 2 wt% fillers were analyzed with the aim to establish structure–function properties relationships. The nanocomposites properties significantly depended on the nature of the incorporated filler. The nanocomposite film prepared with the expanded graphite filler exhibited the highest Young modulus value (E = 1430 MPa) and the best barrier properties. Indeed, barrier properties, rarely studied at high water activities, evidenced a significant improvement with a decrease of the water vapor permeability by a factor 1.8 and of the oxygen permeabilities by a factor close to 2, for a critical water activity higher than 0.95. An increase of the thermal stability was also evidenced for this nanocomposite. It was shown that for all studied nanocomposites, the properties could be related to the dispersion state of the fillers and the simultaneous increase of the crystallinity of the matrix. A specific equation was proposed to take into account these both parameters to accurately predict the nanocomposite barrier properties. Nanocomposite ; Materials science ; Oxygen permeability ; Crystallinity ; Composite material ; Microstructure ; Graphene ; Graphite ; Thermal stability ; Filler (materials) ; Chemical engineering ; Oxygen ; Nanotechnology ; Chemistry Polymer Nanocomposites and Properties ; Polymer crystallization and properties ; Polymer Nanocomposite Synthesis and Irradiation
Authors: Prachi Barsagade | Roshan Khetade | Kalyani Nirwan | Tikesh Agrawal | Santosh Gotafode | Updesh Lade
Source: International Journal of Pharmaceutical Sciences Review and Research (article, 2021-09-15)
Field: Chemistry — Analytical Chemistry

Review Article of Dissolution Test Method Development and Validation of Dosage Form by Using RP-HPLC Dissolution is precise test method used for evaluating drug release of solid and semisolid dosage forms. It is the process by which a solid solute enters a solution. For the analysis of dissolution test method development, the Reverse Phase High Performance Liquid Chromatography is used, and it is the modern of column chromatography. In the reverse phase partition HPLC the relative polarity of the stationary and mobile phase opposite to those in normal HPLC. The main applications of the dissolution testing include biopharmaceutical characterization of the drug product, as a tool to make sure consistent product quality and to predict in vivo drug bioavailability. The article represents the current updates in dissolution testing methods by using Reverse Phase High Performance Liquid Chromatography. The validation parameters explain for the analysis of sample is accuracy, precision, repeatability, detection of limit, quantitative limit, linearity, range and robustness. Analytical method validation includes all procedure and checks required to prove the reliability of a method for quantitative determination of concentration of an analyte or series of analyte in a given sample. The conventional and novel pharmaceutical dosage forms and gives an insight to possible alternatives in drug dissolution testing design. The aim of this review is to represent all the potential standardized test methods development and validation of pharmaceutical dosage form by using RP-HPLC which are analyzed the accuracy of the dissolution sample of the dosage form. Dissolution testing ; Analyte ; Dosage form ; Repeatability ; Chromatography ; Dissolution ; High-performance liquid chromatography ; Biopharmaceutical ; Chemistry ; Detection limit Chromatography in Natural Products ; Pharmacological Effects of Natural Compounds ; Analytical Chemistry and Chromatography
Authors: Qi Liu | Ming Yang | Jiangwei Zhang | Mingliang Yang | Jun Wang | Huajing Zheng | Jun Gou
Source: Frontiers in Physics (article, 2021-04-23)
Field: Materials Science — Materials Chemistry

Three-Dimensional Dirac Semimetal/Organic Thin Film Heterojunction Photodetector With Fast Response and High Detectivity As a typical three-dimensional Dirac semimetal (3D DSM), Cd 3 As 2 possess ultrahigh carrier mobility, high level of full spectral absorption, fast electron transmission speed, and high photocurrent response, which enable wide applications in infrared photodetector. However, the large dark current of the detector based on Cd 3 As 2 thin film limits the application of the small current response. Hence, we demonstrated heterojunction photodetectors based on n-type 3D DSM Cd 3 As 2 (pristine and Zn doped) and p-type organic (PbPc) by depositing PbPc thin film on Cd 3 As 2 (pristine and Zn doped) thin film using thermal deposition method. These photodetectors can detect the radiation wavelength from 405 to 1,550 nm at room temperature. It is remarkable that this thin film heterojunction photodetector exhibits high detectivity (3.95 × 10 11 Jones) and fast response time (160 μs) under bias voltage, which is significantly improved vs. that of Cd 3 As 2 -based devices. The excellent performances are attributed to the strong built-in electric field at the interface of p-n junction, which is beneficial for efficient photocarriers collection and transportation. These results show that DSM/organic thin film heterojunction has excellent performance in the application of photodetectors. By combining 3D DSM with organic to form heterojunction, it provides a feasible solution for high-performance photodetectors. Photodetector ; Heterojunction ; Optoelectronics ; Photocurrent ; Materials science ; Thin film ; Dark current ; Specific detectivity ; Quantum efficiency ; Nanotechnology 2D Materials and Applications ; Graphene research and applications ; Advanced Thermoelectric Materials and Devices