Miracle-dz/UniFAR-FTUs huggingface dataset:
Thermal behavior of (Ce,Zr)Ox/Al2O3 complex oxides prepared by a microemulsion method

A study is reported on the thermal behavior of a (Ce,Zr)Ox/Al2O3 specimen prepared by a microemulsion method and subjected to aging treatments. A similarly prepared classical CeOx/Al2O3 support was used as a reference. Attention is paid to the 1273–1373 K region of treatment, where previous experience demonstrates that this type of material suffers deactivation processes. The structural/morphological characterization of the complex support was performed using X-Ray diffraction (XRD), transmission electron microscopy (TEM) and Raman spectroscopy. Surface and redox properties were also examined using electron paramagnetic resonance (EPR) and temperature programmed reduction (TPR). The (Ce,Zr)Ox/Al2O3 sample contains a mixed oxide component that essentially maintains its structural stability after aging treatment under air at 1273 K although an abrupt loss of the structural homogeneity, leading to segregation into two distinct phases, is produced upon aging at 1373 K. Ce–Zr promoter phases detected during the study maintain the t″ tetragonal symmetry and display a moderate surface composition evolution (small with respect to bulk samples) irrespective of the aging treatment. This is attributed to (Ce,Zr)Ox–Al2O3 interactions, which induce beneficial effects on both components, the Ce–Zr promoter and the alumina carrier. TPR experiments show that the aged (Ce,Zr)Ox/Al2O3 materials display a low temperature reduction peak around 650 K, which was previously observed only on activated bulk materials subjected to redox cycling, and may be of importance in the oxygen handling properties of these materials.
X-RAY INVESTIGATIONS OF MN3P, MN2P AND NI2P

Abstract : DESCRIPTORS: (* Steel 4140, 4330, 3 5 4340, 1 4 , Metallurgy, Processing, Purification, Melting, Electric arcs, Solutions, Slags Separation, P PHORUS, Sulphur, Phase studies, Theory. Tables. An analysis of metal and slag composition data gathered during the operation of a 6-1/2-ton basic electric-arc furnace is made for the purpose of quantitatively describing the refining processes of dephosphorization and desulfurization. A kinetic model is proposed, and the data is examined in light of the model; agreement with theory is shown. Relations are obtained correlating metal and slag composition with the rate the refining processes. The results and their ramifications are discussed with reference to the proposed model actual operating procedure, extrapolation, and optimum processing time.
Development of Electrochemical Sensor Based on Thiolated Calixarene-Functionalized Gold Nanoparticles for the Selective Recognition of Anthracene

In this work, an electrochemical sensor for anthracene detection was constructed based on a modified electrode consisting of thiolated calixarene (TC4)-functionalized gold nanoparticles (AuNPs) and electrochemically reduced graphene oxide (ERGO). Firstly, graphene oxide GO) was reduced on screen printed carbon electrodes (SPCE), followed by the immobilization of AuNPs and TC4 through a self-assembly process to form TC4/AuNPs/ERGO-SPCE. The molecules’ structure was characterized using FTIR and Raman spectroscopy, the sample’s morphology and topology were characterized using Field Emission Scanning Electron Microscopy (FESEM), High Resolution Transmission Electron Microscopy (HRTEM) and electrochemical performance of developed sensor was characterized using electrochemical method. Owing to the outstanding supramolecular recognition of anthracene by TC4, the target analyte was detected accurately with a linear range of 1- $7~\mu \text{M}$ and limit of detection down to $0.0625~\mu \text{M}$ (S/N = 3). Additionally, the sensor was acknowledged for its excellent anti-interference properties in the presence of organic compounds as well as inorganic metal ions. The proposed sensor also yielded comparable results to conventional HPLC method, with a satisfactory recovery of 92–98% in environmental samples.
Degradation of oxyfluorfen in sandy clay loam soil

Even though the persistence of oxyfluorfen may be shorter, depends upon the soil, weather and the crop for which it’s being applied, may vary in the oxyfluorfen residues in the soil environment. Considering the above facts, an attempt has been made to study the persistence and degradation of Oxyfluorfen in sandy clay loam soils under laboratory conditions. Disappearance parameters for Oxyfluorfen residues were calculated using first order reaction kinetics equation and found that its dissipation fit the first order degradation with the R2 values of >0.99 and >0.93 at both the doses of 200 and 400 g /ha during 2018-19 and 2019-2020, respectively. Increase in concentration of application increased the half life of oxyfluorfen with DT50 values of 6.83 & 8.75 days and 9.55 & 10.65 days, during 2018-19 and 2019-20, respectively, at 200 and 400 g/ha applied treatments. The Oxyfluorfen in soil declined sharply and persisted up to 45 days after herbicide application (DAHA) and became Below Detectable Limit (BDL) at 60DAHA at both the doses.
Effect of Liquidity, Profitability, Leverage, and Firm Size on Dividend Policy

This study aims to investigate the relationship between the variables of Current Ratio (CR), Return-on-Equity (ROE), Return-on-Assets (ROA), Debt-to-Equity Ratio (DER), and Firm Size (FS) on Dividend Policy (DP) in real estate and property companies listed on the Indonesia Stock Exchange in the period 2016-2019, looking at nine real estate companies in Indonesia. The research methodology uses an explanatory analysis approach and linear regression. Based on the eligibility and homogeneity of the data, the number of sample companies selected was nine companies. The company’s financial statement data derived from primary data obtained on the Indonesia Stock Exchange, such as current ratio (CR), return-on-equity (ROE), return-on-assets (ROA), debt-to-equity ratio (DER) and firm size and dividend policy variables. The data analysis procedure is first to transform financial data from the original ratio data into interval data and, then, transform it to ordinal data. Furthermore, the validity and reliability process are ignored because the data is primary. Finally, regression testing is part of the hypothesis testing stage. The results of this study showed that the CR, ROE, and firm size had no positive and significant effect on dividend policy. In contrast, DER and ROA have a positive and significant impact on dividend policy.
Reversal Interest Rate and Macroprudential Policy

Could a monetary policy loosening entail the opposite effect than the intended expansionary impact in a low interest rate environment? We demonstrate that the risk of hitting the rate at which the effect reverses depends on the capitalization of the banking sector by using a non-linear macroeconomic model calibrated to the euro area economy. The framework suggests that the reversal interest rate is located in negative territory of around −1% per annum. The possibility of the reversal interest rate creates a novel motive for macroprudential policy. We show that macroprudential policy in the form of a countercyclical capital buffer, which prescribes the build-up of buffers in good times, can mitigate substantially the probability of encountering the reversal rate, improves welfare and reduces economic fluctuations. This new motive emphasizes also the strategic complementarities between monetary policy and macroprudential policy. JEL Classification: E32, E44, E52, E58, G21
Silicon-on-Sapphire Epitaxy by Vacuum Sublimation: LEED–Auger Studies and Electronic Properties of the Films

Epitaxy of silicon on sapphire was studied by growing films up to 20 μ thick using high-temperature sublimation in 10−10 Torr vacuum on the (1012), (1123), (0001), and (1120) substrate surfaces. The surface structure and chemistry of both substrate and film could be monitored using LEED and Auger electron spectroscopy. The epitaxial relationships and the electrical properties were found to depend on deposit-substrate interactions, substrate temperature, and surface structure. A range of epitaxial temperatures could be defined for each substrate orientation within which the proper surface structure could be maintained during film growth. The behavior outside the epitaxial range was explored, revealing several causes for breakdown of optimum growth. The (1012) substrate was found to have the largest epitaxial temperature range. Silicon films of (100), (111), and, under special circumstances, the (110) orientations could be produced. Films thicker than 2 μ could be grown with essentially bulk values for carrier mobility (carrier concentration between 5×1015 and 8×1018/cm3). Film type (n or p), resistivity, and carrier concentration could be controlled by the choice of proper source material, and were reproducible within a factor of 2. Minority carrier lifetimes were about 10−9 sec; this short lifetime is probably due to the presence of defects, especially within the first micron of growth.
Effect of Load Shedding on Small Scale Entrepreneurs: A Case of Kitwe District of Zambia

Electricity is one of the key factors that are critical for accelerating the growth of the economy of the country. Without electricity, a number of sectors are affected. From 2014, Zambia has been facing serious load shedding which has an effect on the lives of people from academia to industry. The study was designed to determine the effect of load shedding on small scale entrepreneurs in Zambia. The approach for the study was mixed research. The sample for the study consisted of 200 people working in bars, salons, barbershops and in cafes. Simple random sampling was used to come up with 200 participants. Data for the study were collected through questionnaire and face to face interviews. Data for the study were analyzed using Analysis of Covariance. The null hypothesis was tested at 5% significance level. The findings of the study revealed that load shedding has negative effect on small scale entrepreneurs in Zambia
Physiological and Economic Aspects of Lettuce Production under Deficit Water and Nitrogen Conditions

This paper presents research on lettuce production's physiological and economic aspects under deficit water and nitrogen conditions. Lettuce (Lactuca sativa L. var. longifolia) is an essential crop for the economy of California. Two experiments were conducted during fall 2017 and spring 2018 to evaluate the effect of different water applications (0, 25, 50, and 100% of required water to replenish weekly crop evapotranspiration). Nitrogen fertilizer levels (0, 25, 50, and 100 percent of nitrogen required for optimum plant growth based on soil chemical analysis) on lettuce optimize the best water and nitrogen level to achieve the highest input efficiency economically justifiable yield. Soil moisture followed a decreasing trend as the irrigation level decreased, while there was no identical trend in soil moisture content in response to nitrogen treatments. The highest leaf water potential was measured for 100% nitrogen application (N100), whereas the lowest one was recorded in the plants with zero nitrogen (N0). The higher irrigation levels caused lower leaf water potential in lettuce, while the zero irrigation level (IR0) demonstrated the highest leaf water potential. Across all treatments, leaf chlorophyll content was more significantly affected by irrigation levels compared to nitrogen treatments. The higher irrigation and nitrogen levels up to 100% produced the highest lettuce yield. However, the highest water and nitrogen use efficiency was recorded at IR50N25 treatment in both growing seasons. The same treatment produced an economically justifiable
The Effect of Word of Mouth and Destination Attributes on Travel Intention to Jordan

Word of mouth is very significant subject in the field of tourism and destination marketing management. This paper contributes to the theme of word of mouth and destination management. A research model was developed to investigate the effect of Word of Mouth (WOM), destination image attraction, tourism product attributes, tourist’s satisfaction and price of tourism products on travel intention to Jordan. A total of 473 self-administrated questionnaires were distributed through convenience sampling to visitors’ in Jordan and analyzed by SPSS software. The results of this study indicate that there is strong relationship and effect of word of mouth and destination attributes on travel intention to Jordan. Many valuable information and results drawn from the research are given to decision makers, researchers and planners.
Rate constants for the reactions of the OH radical with NO2 (M=Ar and N2) and SO2 (M=Ar)

Absolute rate constants for the reactions OH+NO2+M→HNO3+M (M=Ar, N2) OH+SO2+M→HSO3+M (M=Ar) have been determined at 298°K, using a flash photolysis–resonance fluorescence technique. Rate constants k1 and k2 were determined over the pressure range 25–648 torr for M=Ar, while a rate constant for the first reaction was also obtained for M=N2 at 25 torr total pressure. The low pressure third order rate constants were determined to be k1(M=Ar) = (1.02±0.10) ×10−30 cm6 molecule−2⋅sec−1 and k2(M=Ar) = (1.64±0.33) ×10−31 cm6 molecule−2⋅sec−1, in reasonable agreement with the literature values. The bimolecular rate constants at 760 torr total pressure were determined to be kbi1= (5.9±0.7) ×10−12 cm3 molecule−1⋅sec−1 (M=Ar), kbi1= (6.4±1.0) ×10−12 cm3 molecule−1⋅sec−1 (M=N2), and kbi2= (6.7±0.7) ×10−13 cm3 molecule−1⋅sec−1 (M=Ar). Extrapolation of the data led to limiting high pressure second order constants of k∞1? 8.5×10−12 cm3 molecule−1⋅sec−1 and k∞2? 8.3×10−13 cm3 molecule−1⋅sec−1.
The structural properties of amides and imides as hydrogen storage materials

Abstract We discuss crystal structure of amides and imides, which are focusing on promising hydrogen storage materials. They are ionic crystal with anion of (NH2)– or (NH)2– and cation of Li+, Na+, Mg2+, Ca2+, and so forth. We also discuss reaction mechanisms on hydrogen ab/desorption of amide/imide hydrogen storage materials.
Effect of Pit and Fissure Sealants on the Prevention of Enamel Demineralization After Exposure to Streptococcus mutans Biofilm: An Vitro Study

Objective: The aim of this study was to evaluate the effect of sealants on the prevention of enamel demineralization and on biofilm metabolic activity. Materials and Methods: Cavity preparations were performed on 45 blocks of bovine teeth (4x4x4 mm) randomly assigned to three groups (n=15): RI-Riva Light Cure®/SDI; EM-Embrace™ WetBond™ Pulpdent Corp.®; and CO-Natural Flow/DFL resin (negative control). The sealed blocks were subjected to thermocycling (500 cycles/30 s). Half of the blocks were covered with acidresistant varnish to create a control area (RI, EM, and CO) and an experimental area (RI-EX, EM-EX, and CO-EX). They were subsequently exposed to Streptococcus mutans biofilm for assessment of demineralization by the Knoop microhardness test (50 g/15 s), at 25, 50, 100, 150, and 200 μm from the interface. In another test, the cylinders of the sealants (4 mmx3 mm) were subjected to the biofilm metabolic activity test. Results: The RI-EX group showed higher microhardness than CO-EX (p<0.05) and less demineralization when compared to RI at all distances. Microbial activity was lower in EM compared to CO, but not statistically significant in relation to RI. Conclusion: Both sealants can inhibit enamel demineralization in the presence of S. mutans biofilm.
Digital nationalism: Understanding the role of digital media in the rise of ‘new’ nationalism

While digital technologies were initially seen as harbingers of globalisation and cosmopolitanism, scholars increasingly acknowledge their role in the rise of nationalism and right-wing populism. Yet, this surge of interest leaves at least two important questions unanswered. Where was nationalism before its apparent resurgence? Are contemporary forms of nationalism different from their predecessors, and can these changes be linked to digital technologies? To answer these questions, we argue for the importance of understanding the less visible ways in which digital technologies reproduce our sense of belonging to a world of nations. We discuss three such mechanisms: the architecture of internet domains, the bias of algorithms, and the formation of national digital ecosystems. Next, we examine three characteristics of contemporary nationalism that can be partly linked to recent shifts in the global communication ecology: diversification, fragmentation and commodification. We conclude by considering the implications of our arguments for future research in the field.
Microcentrifuge tubes as disposable immunoelectrochemical cells for the on-site detection of GFAP, biomarker of hemorrhagic stroke

Nowadays, stroke is the leading cause of mortality worldwide. Hemorrhagic (HS) and ischemic stroke (IS) have different pathophysiology and treatment. While there is a treatment for IS that reverses its most devastating effects, this does not happen with HS, and treatment for IS could even worsen HS. Therefore, differential diagnosis between IS and HS in the acute stage is an important challenge. Current diagnostic of acute stroke relies on neuroimaging techniques that provide valuable information but not always are readily available. Therefore, the development of analytical tools for rapid and on-site detection of biomarkers capable of differentiate between the types of stroke could enhance the optimally manage of patients. Glial fibrillary acidic protein (GFAP) is considered one of the acute HS biomarkers; its levels in serum are increased in patients with HS in comparison with IS patients. In this work, a sandwich-type immunoassay for the determination of GFAP was wholly performed inside a microcentrifuge tube immobilizing the capture antibody on its bottom. The electrodes needed for the detection are included in the cap in a simple and innovative strategy that allows to follow an all-in-one procedure. Thus, the cap is drilled with three stainless-steel pins that act as electrodes. With this design, when the tube is closed the head of the pins is inside and thus, once the immunoassay is finished, the tube is turned upside down allowing the electrochemical detection in the same tube. The good precision of this tube-based electrochemical cell makes possible to obtain a point-of-need device with huge potential for analytical applications that require rapid and on-site response. In the case of GFAP determination, this device, combined with a handheld potentiostat, would be of great interest for its use in out-of-hospital sites to help determine the cause of the stroke in the acute stage.
The De Winter Dilemma: The Management and Outcome of a Patient with De Winter Electrocardiographic Pattern in the Pre-Hospital Setting

De Winter sign, first described by De Winter et al. in 2008, is an electrocardiographic (EKG) pattern associated with typical chest pain without classic ST-segment elevation that signifies total occlusion of the proximal left anterior descending coronary artery (LAD). In this case report we aim to highlight the dilemma of the use of thrombolytic therapy in patients with De Winter EKG pattern in the absence of immediate primary percutaneous coronary intervention (PPCI). A 66-year-old patient encountered the emergency department (ED) of a secondary care hospital for chest pain that began 30 minutes prior to his ED visit with more than 1 mm up-sloping ST depression with symmetric tall T in lead V3-V4-V5 and V6 characteristic of De Winter T-wave ECG pattern. The patient then presented a cardio-respiratory arrest with initial rhythm being read as pulseless ventricular tachycardia. He was resuscitated and received 3 chocks. The resuscitation was successful and EKG showed an ST segment elevation in the precordial leads. Thrombolytic therapy was administered and successful. Angiographic evidence of an occluded LAD was obtained later on. Although De Winter’s pattern was proved to be a sign of critical occlusion of the proximal segment of LAD artery, there lacks proper guidelines on the management of this particular EKG sign. Moreover, thrombolytic therapy is still controversial in the presence of such a sign as current guidelines advocate against this therapy in the absence of STEMI. Our case report adds to the emergent cases of patients with EKG De Winter pattern having significant LAD occlusion that was successfully treated with thrombolytic agents.
Structural Characteristics of Er Doped LiNbO3 Thin Films Grown by the Liquid Phase Epitaxy Method

Erbium (Er 3+ ) doped LiNbO 3 single crystal thin films have been grown on LiNbO 3 (001) substrate by the liquid phase epitaxy method. The crystallinity was determined by high-resolution X-ray diffraction. The lattice mismatch between Er 3+ -doped LiNbO 3 films and LiNbO 3 (001) substrate was investigated by X-ray rocking curve analysis. Also we studied the structural characteristics of Er 3+ doped LiNbO 3 films and surface morphology dependent on the film thickness.
High-pressure and high-temperature polymorphism in silica

We synthesised a number of new silica modifications in the electrically heated diamond anvil cells at pressures over 100 GPa and temperatures over 1200 K. The structure of these polymorphs is based on hexagonal close packing of oxygen atoms with different degree of ordering of silicon atoms in octahedral and tetrahedral sites.
PPRQ: Privacy-Preserving MAX/MIN Range Queries in IoT Networks

Range queries are widely used in several Internet-of-Things (IoT) applications as a general strategy to improve the efficiency of the system. However, the communication patterns generated by the IoT nodes could lead to the identification of the devices satisfying the query, as well as to the disclosure of the queried data. State-of-the-art solutions to address the cited security issues rely on dedicated edge/fog nodes, whose deployment could be too expensive or challenging, especially in unattended scenarios where the installation of ad hoc locations could be difficult and mains-supply is hardly available. In this article, we propose PPRQ, a resilient, scalable, and lightweight protocol that allows privacy-preserving range queries in IoT networks. PPRQ is a probabilistic scheme that can be easily adapted to MIN, MAX, and MAX/MIN range queries, while requiring only hashing and bitwise xor operations. We show that PPRQ is robust, as it can be configured to provide over 99.9% accuracy in the query results. We also prove its resiliency against passive and active adversaries for a number of interesting and realistic scenarios. Our results are rooted in sound probability theory and supported by an extensive simulation campaign, while comparisons against state-of-the-art solutions show the flexibility and adaptability of PPRQ, especially for remote and unattended scenarios. Finally, further research directions opened up by the proposed solution are also highlighted.
Highly active nickel oxide water oxidation catalysts deposited from molecular complexes

Nickel oxide (NiOx) water oxidation catalysts with high catalytic activity have been electrodeposited from [Ni(en)3]Cl2 (en = 1,2-diaminoethane, NiOx-en) in a 0.10 M borate buffer (NaBi) solution (pH = 9.2). Electrolysis experiments at a fixed applied potential of 1.1 V (vs. Ag/AgCl) established that the NiOx-en films sustain a stable current of 1.8 mA cm−2 for extended periods, compared with 1.2 mA cm−2 for films derived from [Ni(OH2)6](NO3)2 and [Ni(NH3)6]Cl2 when tested in a 0.60 M NaBi buffer. XAS studies indicate that the γ-NiOOH phase is formed in each case whereas SEM studies revealed significant differences in film morphology. The NiOx-en films were found to be more homogenous and to have a higher electroactive surface area, as determined from capacitance measurements. The results highlight the influence that the choice of molecular precursor can have on the activity and robustness of electrodeposited NiOx water oxidation catalysts.