Miracle-dz/UniFAR-FTUs huggingface dataset:
Impact of salts on polyacrylamide hydrolysis and gelation: New insights

Polyacrylamide (PAM) and its derivatives are the most commonly used polymers in the preparation of polymeric gels for water control in petroleum reservoirs. This study involved the use of polyethylenimine (PEI) as a crosslinker for PAM. In this study, we investigated PAM alkaline hydrolysis at high temperatures. The effects of salts [sodium chloride (NaCl) and ammonium chloride (NH4Cl)] on the degree of hydrolysis (DH) of PAM were investigated. These salts were used as retarders to elongate the gelation time of the PAM/PEI system. The data obtained from 13C-NMR was used to understand the retardation mechanisms by salts. We found that NH4Cl accelerated the extent of hydrolysis more in comparison with NaCl. Moreover, the apparent viscosity of the hydrolyzed samples was measured. PAM hydrolysis in the presence of NH4Cl resulted in a lower solution viscosity than that in the presence of NaCl. Therefore, NH4Cl was more effective in shielding negative charges on the carboxylate groups of the partially hydrolyzed polyacrylamide (PHPA) chain. NaCl and NH4Cl were compatible with the PHPA/PEI system, but sodium carbonate showed a white precipitate. In addition, high-temperature/high-pressure elastic modulus data were reported for the first time for this system. Differential scanning calorimetry was coupled with rheology to explain the PAM/PEI crosslinking in the presence of salts. Models were developed to assess the impact of the salts on the PAM DH and the induction period before gelation. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41185.
Ternary Arsenides ACuAs2 and Ternary Antimonides AAgSb2 (A = Rare-Earth Elements and Uranium) with HfCuSi2-Type Structure

Abstract The arsenides ACuAs2 (A = Y, La-Nd, Sm, Gd-Lu) and the isotypic antimonides AAgSb2 (A = Y, La-Nd, Sm, Gd-Tm, U) were prepared for the first time and their lattice constants are reported. Single crystals of CeAgSb2 were obtained from a NaCl/KCl flux and their structure was determined from four-circle diffractometer X-ray data: P4/nmm, a = 436.3(1) pm, c = 1069.9(4) pm, Z = 2, R = 0.017 for 381 structure factors and 12 variable parameters. CeAgSb2 is isotypic with HfCuSi2, CaMnBi2, and ZrCuSiAs. In contrast to other ternary lanthanoid transition metal antimonides with HfCuSi2-type structure, the silver site is fully occupied. Chemical bonding in CeAgSb2 can be rationalized by the formula Ce3+Ag+Sb-Sb3-, where the superscripts indicate oxidation numbers.
Altering Physical Therapy Interventions to Address Evolving Symptoms in a Patient Appearing to Develop CRPS after Foot Crush Injury: A Case Report

Background: Complex Regional Pain Syndrome (CRPS) is a rare, complicated condition that can develop after trauma and is primarily characterized by high pain intensity that is disproportionate to injury expectations. Persistent CRPS symptoms can lead to permanent impairment and disability due to activity avoidance and limb disuse. While interventions such as Pain Neuroscience Education (PNE) and Graded Motor Imagery (GMI) are generally supported for use in patients diagnosed with CRPS, there is a gap in the literature regarding the use of these interventions as a means of preventing full CRPS onset in individuals developing signs of the condition. Case Description: The following report describes the case of a patient referred to physical therapy after sustaining a foot crush injury. During the episode of care, the patient began to develop CRPS-like symptoms. Interventions: The purpose of this case report is to highlight the multimodal therapeutic interventions utilized when early symptoms were suggestive of CRPS, with the intention of preventing full CRPS onset. Outcome Measures: The CareConnections Functional Index, Tampa Scale of Kinesiophobia, and Pain Catastrophizing Scale were used to measure the patient’s pain intensity, function, global rating of change, pain-related fear of movement, and negative feelings regarding pain. Discussion: While early treatment of CRPS is crucial in reducing the likelihood of permanent impairment and disability, this case suggests that utilization of CRPS interventions with CRPS-like symptoms prior to an official diagnosis may be too early and therefore not effective at preventing the disease course.
Synthesis of chain end functionalized multiple hydrogen bonded polystyrenes and poly(alkyl acrylates) using controlled radical polymerization

Hydrogen bonding uracil functionalized polystyrenes and poly(alkyl acrylate)s were synthesized via stable free radical polymerization. Quantitative chain end functionalization was achieved using novel uracil containing TEMPO- and DEPN-based alkoxyamine unimolecular initiators. Polymerizations were conducted at 130 °C and yielded functionalized homopolymers with narrow molecular weight distributions (Mw/Mn ∼ 1.20) and predictable molecular weights. Polymerizations of both n-butyl acrylate and styrene using the DEPN- and TEMPO-based alkoxyamines resulted in molecular weight control over a wide range of conversions. Terminal functionalization of poly(alkyl acrylate)s with hydrogen bonding groups increased the melt viscosity at temperatures below 80 °C, which was defined as the dissociation temperature, and as expected, the viscosity approached that of the nonfunctional analogues above this temperature. The hydrogen bonding effect was also evident in thermal (DSC) analysis and 1H NMR spectroscopic investigati.
The Impact of Service Recovery on Repurchase Intentions: A Moderated Mediation Model

The purpose of this paper is to fill an important gap in literature by exploring the moderating role of customer emotions and the mediation of perceived fairness on service recovery effecting repurchase intentions. Based on the data of 200 valid questionnaires collected from oversees Pakistani in China, this paper used SPSS v.21. 0 for data processing and analysis in which the reliability test was conducted and the hypothesis testing of direct and indirect effect was done on SPSS extension called Process v.2. 3 developed by Hayes (2013). Results reveal that all variables of the study significantly correlate with each other, the service recovery has a significant impact on repurchase intentions. Results also disclose that perceived fairness mediates the effect of service recovery on repurchase intentions while moderation of customer emotions supporting the existence of moderated mediation. The findings of this study are particularly valuable for managers, it allows them to enhance the understanding on the aspect of service recovery that leads to repurchase and will help management to make an effective retention/repurchase strategies in service recovery situations.
Rate Measurements for the Reaction of H-Atoms with F2

The temperature dependence of the rate constant of the fast reaction has been measured in a flow system using mass spectrometric analysis. The result has been obtained between 224 and 493 K. This corresponds to an activation energy of 9.2 ± 0.3 kJ mol−1. Die Temperaturabhangigkeit der Geschwindigkeitskonstanten der schnellen Reaktion wird in einem Stromungssystem mit massenspektrometrischer Analyse gemessen. Als Ergebnis erhalt man zwischen 224 und 493 K. Das entspricht einer Aktivierungsenergie von 9,2 ± 0,3 kJ mol−1
A tripodal tris(thiophene) derivative of hexahydropyrimidine and its ladder‐like extended structure

In the title compound, 2-(2-thien­yl)-1,3-bis­(2-thienyl­methyl)­perhydro­pyrimidine, C18H20N2S3, a new hexa­hydro­pyrimidine derivative with no formal crystallographic symmetry (but approximate Cs mol­ecular symmetry), the thio­phene rings are approximately orthogonal to the mean plane of the saturated pyrimidine `core' of the mol­ecule, with the three S atoms positioned on one side of the six-atom mean plane. The S atom of the directly attached thio­phene ring is involved in an unconventional (alk­yl)C—H⋯S hydrogen bond (H⋯S = 2.87 A) with a thio­phene CH group of the closest neighbouring mol­ecule, leading to a ladder-like one-dimensional chain as the extended structure. The crystal specimen used for data collection was an inversion twin [twin fraction x = 0.41 (4)].
Synthesis and structural characterization of a yttrium coordination polymer formed by bridging of an acyclic polyether

The amide-type acyclic polyether, 1,2-ethylenedioxy-bis(N-pyridin-2-ylmethyl-benzamide) (L) was synthesized and characterized by EA, IR and 1H NMR spectroscopy. The reaction of yttrium nitrate with L produced a rare chain structural coordination polymer {[Y(NO3)3L(H2O)] · (H2O)} n (1) by use of the flexible ligand L as the building blocks. The structure of 1 was determined by X-ray crystallography and thermal analysis. In 1, L, as a bidentate bridging spacer, binds two neighboring Y atoms to form a one-dimensional chain polymer. The chain polymer was further connected into the three-dimensional network by hydrogen bonding interactions.
SERS activity and stability of the most frequently used silver colloids

Single-molecule detection by surface-enhanced resonance Raman scattering (SERRS) spectroscopy has been demonstrated for a variety of molecules. The detection of single molecules that do not have a resonance contribution, SERS, has been shown in the case of adenine. However, when colloidal particles isolated on planar substrates are used as the enhancing medium, the presence of anomalous signals significantly complicates the analysis of the spectra. Selection of a silver colloid that minimizes these spurious signals should improve the ultra-sensitive detection of non-resonant single molecules by SERS. A range of silver colloids, prepared by different methods, were investigated with respect to their activity and stability. Minimal anomalous signals were obtained from hydroxylamine-reduced silver colloids, which suggests that this colloid will be better for ultra-sensitive SE(R)RS experiments compared to the more common citrate- and borohydride-reduced silver colloids.
Sr2CuGaO3S, a Rare Example of Square Pyramidal Gallium

A new gallium oxysulfide, Sr2CuGaO3S, has been prepared. It crystallizes in a novel layered structure of anti-PbO type Cu2S2 sheets alternating with gallium perovskite oxide layers. This is the first example of Ga in a square pyramidal coordination geometry in an extended structure.
PRELIMINARY INVESTIGATIONS ON THE USE OF 137Cs TO ESTIMATE EROSION IN SASKATCHEWAN

Records of radioactive fallout on the Canadian Prairies indicate that 137Cs should be present in soils at levels that can be counted relatively accurately. Less than 7% of total 137Cs appears to have fallen during the winter months, so that redistribution of 137Cs with blowing snow should not seriously impair the possibility of using 137Cs as a tracer for soil erosion. Methodology for measuring 137Cs in soil samples is described, as is a semi-empirical method for correcting for the effect of bulk density of the sample on counting efficiency. Preliminary data indicate that noneroded soils in the Saskatoon area contain about 6.4 pC 137Cs/cm2. There was little variation in 137Cs with slope position on gently rolling sites under native vegetation, whereas there was considerable redistribution in cultivated fields. It was estimated that a knoll in one cultivated field had lost about 10% of its topsoil since the early 1960s when most 137Cs was deposited.
Fiber Optic Pressure Measurement with Cholesteric Liquid Crystals

Abstract The paper presents the fiber-optic method for measurement of high hydrostatic pressure applied to a sensing element comprising a cholesteric liquid crystal (ChLC) being connected to multimode optical fibers for communication with a light source and a device for measurement of light intensity. The method exploiting the effect of pressure-induced changes in the wavelength of maximum light reflection observed in ChLCs, and is particularly well adapted for measuring pressure up to 100 MPa with a good linear response and sensitivity for specific ranges of pressure useful in industrial applications. The obtained data indicate that a fiber optic sensing device based on this method has pressure coefficient two orders of magnitude higher than current high-pressure sensors. The paper discusses also possible approaches towards temperature desensitization procedure of the fiber-optic method of pressure measurement.
Fourier Transform near Infrared Spectroscopy Applied to Analysis of Chocolate

Fourier transform near infrared (FT-NIR) spectroscopy was used to establish calibration equations with the aim of determining sucrose, lactose, fat and moisture in chocolate. The possibility of using FT-NIR spectroscopy for evaluating rheological properties (viscosity and yield) of chocolate was also investigated. The concentrations of individual components and the values of viscosity and yield obtained by standard methods were used as reference values. The spectra of 96 chocolate samples were recorded in reflectance mode in the range of 910–2500 nm using an FT-NIR Nicolet Avatar 360N spectrometer equipped with the UpDRIFT accessory. The first or second derivative transformation of the original NIR spectra gave the best accuracy. A partial least squares (PLS) algorithm was used to create calibration models relating reference values to spectral data. The models were validated using cross-validation. The validation results proved that fat, sucrose and lactose can be predicted with sufficient accuracy, while predicted values for moisture, viscosity and yield are less reliable.
Aplicação da tecnologia de agentes de planejamento em operações de satélites

Este trabalho apresenta uma solução para a automatização das operações de satélites visando aumentar a confiabilidade e a redução do custo nas operações espaciais. O sistema de Planejamento Automático de Operações de Vôo (PLANPOV) de satélites aqui apresentado permite a geração automática de Planos de Operação de Vôo (POV) para a fase operacional de rotina de satélites do Instituto Nacional de Pesquisas Espaciais (INPE). O seu desenvolvimento está baseado na técnica de agente de planejamento temporal, da área de Inteligência Artificial e faz uso da Linguagem de Definição do Domínio de Planejamento (PDDL2.2) e do planejador “Local Search for Planning Grafhs – Time Initial Literal and Derived Predicates”( LPG-TD).
Analytical Chemistry for Environmental and Human Health. Visual determination of protein in urine using Bromochlorophenol Blue and a membrane filter.

pH3. 0において,ブロモクロロフェノールブルー(BCPB)とタンパク質との会合体がメンブランフィルター(MF)に捕集され,これを乾燥させると黄色から青色に変化するという現象に基づき,尿中タンパク質の簡易目視定量法を開発した。 目視での検出限界は尿中タンパク質濃度として40mg/lであり,この高感度性の要因は,水溶液中で生成する三元会合体,HBCPB--BCPB2--タンパク質,中の黄色い色素化学種HBCPB-の機能に依存するところが大きい。 すなわち,HBCPB-はタンパク質-色素会合体のMFへの吸着性を増加させ,更に黄色から青色へ変色することで肉眼による検出感度を著しく向上させる。 尿試料を用いて,現在はん用されているクマシーブリリアントブルー吸光光度法との比較を行った結果,良好な相関が得られた(r=0.9304;n=17)。 本法は特別な機器を要さず,初期腎疾患発見のためのスクリーニング法として十分な簡便性と感度を有している。
Identification of acyclic isoprenoid hydrocarbons in wax derived from tank bottom sludge

The oil-soft wax fraction of the microcrystalline wax, extracted from the Bombay High crude tank bottom sludge (Indian origin), has been characterized using gas liquid chromatography (GLC), 1 H and 13 C nuclear magnetic resonance (NMR), and gas liquid chromatography-mass spectroscopy (GLC-MS). A series of saturated acyclic isoprenoid hydrocarbons have been identified in this wax. These structures have been confirmed by recording GLC-MS spectra of the oil-soft wax fraction at reduced ionization potentials of 30 and 20 eV and also recording the spectra of two known available standards, namely, pristane and phytane.
Structural Properties of Atactic Polystyrene of Different Thermal History Obtained from a Multiscale Simulation

A method is presented to obtain well-equilibrated atactic polystyrene (aPS) samples for molecular simulations. The method starts with equilibrating the polymer in the melt at length scales beyond the Kuhn length lK, using end-bridging Monte Carlo techniques; at this level a (2:1)-coarse-grained description of aPS is being employed. Subsequently atomistic detail is reintroduced, and the sample is equilibrated at the smallest length scales as well. At length scales beyond lK the simulated polymer chain conformations fulfill the random-coil hypothesis of Flory, and C∞ = 8.7 ± 0.1 at 463 K. Eventually various glassy samples are created by subjecting the melt sample to different cooling rates. Pair correlations are in agreement with existing X-ray data, and the amount of dihedral angles in the trans (t) state agrees with NMR data. On the level of dyads, the conformations of racemic dyads agree well with existing NMR results. At the same time, meso dyads conformations do not agree: 65% of meso dyads is in the g.
Preparation of copper thin films at ambient temperature by microwave plasma‐enhanced chemical vapor deposition from the copper (II) acetylacetonate‐argon‐hydrogen system

Copper‐containing films were prepared at room temperature by microwave plasma‐enhanced chemical vapor deposition from the Cu(C5H7O2)2‐Ar‐H2 system. The structure and composition of films as well as the concentration depth profiles of Cu, Si, C, and O atoms in the Cu/Si and Cu/Cr/Si contact structures were determined by x‐ray‐diffraction techniques, Auger electron spectroscopy, Rutherford backscattering spectroscopy, and nuclear reaction analyses. Carbon atoms were found as major impurities in the deposited material. The carbon content and resistivity of films were strongly dependent on the direct bias voltage of substrates and gas‐phase composition. Pure copper films with a resistivity of 2–3 μΩ cm were deposited on Si substrates with a direct bias voltage of −50 V and a hydrogen‐rich Cu(C5H7O2)2‐Ar‐H2 gas phase.
Polyrhodanine coated cellulose nanocrystals as optical pH indicators

A simple and green approach to produce cellulose nanocrystal@polyrhodanine (CNC@PR) core–shell nano-particles via in situ polymerization is proposed. The core–shell nanoparticles displayed reversible colour change in response to pH, confirming their utility as optical pH indicators. This property was retained when the nano-particles were configured into other shapes, such as flat films or hydrogel beads.
Vitamin B1 supported on silica-encapsulated γ-Fe2O3 nanoparticles: design, characterization and application as a greener biocatalyst for highly efficient acylation

A new magnetic catalyst was synthesized by the immobilization of vitamin B1 (thiamine hydrochloride) on the surface of silica-encapsulated γ-Fe2O3 nanoparticles. Its capability was evaluated in the acylation of alcohols and phenols with acetic anhydride under solvent-free conditions and afforded the desired products in high yield. This novel magnetic organocatalyst could be separated from the reaction vessel by use of an external magnet and recovered 5 times without a significant loss of its activity. The amount of loaded vitamin B1 on the silica-encapsulated γ-Fe2O3 was assigned by TGA and confirmed by back titration. Availability, cheapness and low toxicity are reasons associated with the utilization of vitamin B1 as a catalyst. The catalyst has been characterized by FT-IR, XRD, SEM, VSM and TG/DTA.
Univariate versus Multivariate Spectrophotometric Methods for Simultaneous Determination of Complex Binary Mixtures with Overlapped Spectra: A Comparative Study

Two novel simple and accurate univariate spectrophotometric methods were described for the determination of a binary mixture of Sodium cromoglicate (SCG) and Fluorometholone (FLU) namely; ratio subtraction coupled with extended ratio subtraction (RS-EXRSM) and constant center (CCSM) spectrophotometric methods. The methods were able to recover the zero order absorption spectra of both drugs from their binary mixture through simple mathematical calculations. The linearity ranges were found to be (2.5–25 µg/mL) and (4- 25 µg/mL) for SCG and FLU, respectively. A comparative study was conducted between the proposed univariate methods versus multivariate ones, based on using principle component regression (PCR) and partial least squares (PLS-2). Upon applying the methods for the determination of SCG and FLU in laboratory prepared mixtures, the (CCSM and PLS-2) proved to be of higher predictive ability rather than (RS-EXRSM and PCR) in prediction of mixtures containing low concentration of one of the components. The proposed methods were validated in compliance with the ICH guidelines. These methods could be alternative to different HPLC techniques in quality control laboratories lacking the required facilities for those expensive techniques
Video image naval vessels and ships detection method based on YOLOv5x

With the rapid development of artificial intelligence technology, deep learning technology has attracted more and more people's attention. In the field of national defense, the war mode has gradually developed from the traditional mechanized combat mode to the intelligent combat mode. YOLOv5 network based on Mosaic data enhancement and adaptive anchor frame is widely used in the field of target detection. This paper presents a ship detection method based on YOLOv5x video image. We applied the annotation of shooting data and self-made data set to obtain the training data based on video images. Then, combined with the YOLOv5s model, the transfer learning method was adopted to train the model and modify the weight parameters. Experimental results show that the detection accuracy of the proposed algorithm can reach 99.5% for target naval vessels and ships in video images
Small-sized vacuum-arc-discharge x-ray radiograph

Experiments were performed aimed at developing a plasma soft-x-ray source of small spatial dimensions. Radiating hot plasma was produced on compression of a metal vapor by a current pulse with amplitude Im = 215 kA and rise time Tr = 200 ns. The metal vapor jet was generated by initiating a vacuum arc discharge (Im = 8.5 kA, Tr = 6 µs) with an aluminum, tin, copper or iron cathode. Due to the small longitudinal dimension of the compressed Z-pinch, a single flash of soft x-rays was detected in the electrode gap. The least spatial dimensions of the radiating region were attained for aluminum and tin vapor pinches. When tin vapor was used, the diameter of the radiating region was 7 ± 2 µm and its height was 17 ± 2 µm. The x-ray pulse FWHM was 2–3 ns. The radiation power in the spectral range 1.56–1.9 keV was 10–15 MW for the aluminum vapor pinch and 5–10 MW for the tin vapor pinch.
Electrochemical Polymerization of 2-(Dioctylamino)-1,3,5-triazine-4,6-dithiol on Iron Plates

2-Dioctylamino-1,3,5-triazine-4,6-dithiol monosodium salt was electrochemically polymerized on an iron electrode in a Na 2 CO 3 -water electrolyte, possibly indicating a clear oxidation peak at 0.75 V vs SCE. Polymer film on the plates increased with time, temperature, and the concentration to about 3000 μm in thickness. Polymer units deposited on iron were estimated to be oriented perpendicular to the surface of iron plate from IR-RAS and contact angle measurements
Quantitation of Neutral Lipid Mixtures Using High Performance Liquid Chromatography with Light Scattering Detection

Abstract A high performance liquid chromatographic (HPLC) method was developed for quantifying reaction mixtures obtained from the lipase-catalyzed transesterification of fats and oils. The reaction mixtures of interest were composed of neutral lipid classes that include alkyl esters, free fatty acids, triglycerides, 1,2- and 1,3-diglycerides, and 1 (2)-monoglycerides. The method, a modification of a literature procedure, uses a binary mobile phase of hexane (A) and methyl-t-butyl ether (B) each modified with acetic acid (0.4%) and a gradient elution profile that reduced analyses' times by 25%. Lipid classes were measured by use of an evaporative light scattering detector (ELSD). Precision of injection and linearity of response of the ELSD over the range of sample amounts of interest were established for the lipid classes measured by use of standards. The method was applied to the compositional analysis of prospective biofuel alkyl esters prepared from fats, oils, and recycled greases. Mention of brand or.