Miracle-dz/UniFAR-FTUs huggingface dataset:
Temperature Dependence of the Positron Annihilation in Liquid and Solid Bismuth and Gallium

The annihilation rate is measured for liquid and solid Bi and Ga at the peak of angular correlation curve. Linear increase of this rate observed up to the melting point confirms the lack of positron trapping in solid Bi and Ga. At the melting point a nearly 20% increase of the counting rate is observed for Ga, while for Bi about 5% decrease is noticed. The anomalies found in the F(T) curve for the liquid phase are associated with the existence of cluster atoms and with the process of their structure rebuilding. With the exception of small momenta ranges there are no noticeable variations of the electron momentum distribution measured at different temperatures. Es wird die Annihilationsrate fur flussiges und festes Bi und Ga am Maximum der Winkelkorrelationskurve gemessen. Der lineare Anstieg dieser Rate, der bis zum Schmelzpunkt beobachtet wird, bestatigt das Fehlen von Positronenanhaften in festem Bi und Ga. Am Schmelzpunkt wird ein Anstieg von nahezu 20% der Zahlrate fur Ga beobachtet, wahrend fur Bi ein Absinken von etwa 5% bemerkt wird. Die in der F(T)-Kurve gefundenen Anomalien fur die flussige Phase sind mit der Existenz von Clusteratomen und mit dem Widerherstellungsprozes ihrer Struktur verbunden. Mit Ausnahme des Bereichs kleiner Impulse treten betrachtliche Anderungen der bei verschiedenen Temperaturen gemessenen Impulsverteilungen auf.
Complexation of basic amino acids by water‐soluble calixarene sulphonates as a study of the possiblemechanisms of recognition of calixarene sulphonates by proteins

The interactions of calixarene sulphonates with the basic amino acids arginine and lysine were studied by 1H NMR spectroscopy. Strong electrostatic binding occurs for calix[4]arene sulphonate with both lysine and arginine at pH 1 and 5. For the higher calixarenes, only weak interactions at the faces of the flattened macrocycles occur. This binding is in contrast to the inhibition of protein–protein interactions by the calixarenes where the calix[6]arene and calix[8]arene sulphonates show much stronger effects. © 1998 John Wiley & Sons, Ltd.
High-mobility organic thin-film transistors based on α,α′-didecyloligothiophenes

We have fabricated organic thin-film transistors and integrated circuits based on the small-molecule organic semiconductors α,α′-didecylquaterthiophene, α,α′-didecylquinquethiophene, and α,α′-didecylsexithiophene. The organic semiconductors were deposited by thermal evaporation, with solution-processed and cross linked poly-4-vinylphenol serving as the gate dielectric layer. We have found that bottom-contact devices based on these materials have better electrical performance than top-contact devices, presumably due to more efficient carrier injection from bottom contacts due to the presence of the relatively long alkyl chains substituted at the α- and ω-positions of the oligothiophene molecules. Bottom-contact transistors have carrier mobility as large as 0.5 cm2/V s and on/off current ratio as large as 105, and ring oscillators fabricated using bottom-contact transistors and α,α′-didecylsexithiophene as the organic active layer have signal propagation delay as low as 30 μs per stage.
Investigation of the Formation Mechanism of Aligned Nano‐Structured Siloxane Coatings Deposited Using an Atmospheric Plasma Jet

In this study surfaces exhibiting a nano-structured morphology have been creating in a single step deposition process using an atmospheric pressure plasma jet. Plasma polymerized coatings were deposited from a HMDSO monomer which was introduced into a He/N2 plasma in the form of aerosolized droplets. By controlling the plasma discharge regime and monomer flow rate, the surface morphology was altered to create surfaces exhibiting an aligned fibrous morphology or a surface consisting of spherical agglomerates. Optical emission spectroscopy showed variation in photon emission energy depending on the He/N2 ratio. Both thermal imaging and numerical simulations indicate that vaporization of the monomer occurs, which facilitates monomer polymerization in the gas phase and subsequent particulate nucleation. XPS analysis identified a higher amount of carbon bound siloxy species at regions where greater particulate formation was observed on the substrate. Cross-sectional SEM and He-ion imaging indicate that the formation of fibrous structures is associated with localized surface charging, which gives rise to selective agglomeration of semi-amorphous particulates which become aligned on the substrate. Modeling of droplet behavior in the plasma indicates that under conditions of higher monomer flow rate, saturation within the plasma occurs which facilitates nucleation of particulates, while experimental and modeling results indicate surface driven growth mechanisms are more likely to occur at lower precursor flow rates.
Sulfide saturation of basalt and andesite melts at high pressures and temperatures

When the sulfur content of an Fe-bearing magma exceeds the saturation limit for the bulk composition, an immiscible iron sulfide melt fraction separates. For an understanding of the geochemistry of sulfur-bearing magmatic systems, more information is needed regarding the solubility of metal sulfide in silicate melt at its source and the solubility changes as a function of changing intensive and extensive variables. In the present investigation, the sulfur saturation surface is determined for the pressure range from 12.5 to 30 kbar and the temperature range from 1300 to 1460 C for three silicate melt compositions representing a range of SiO2 and FeO compositions.
The Effect of Perception of Creating Shared Value (CSV) Activity on Job Satisfaction of Non-permanent (Part-time) Employees: Analysis of the Mediating Effect of Organizational Commitment and the Moderating Effect of Self-Efficacy

This research examines the effect of perception of creating shared value (CSV) activity on the organizational commitment and job satisfaction of non-permanent (part-time) employees in order to understand the importance of CSV. In order to accomplish this study, 559 questionnaires were used for final analysis. SPSS 25.0 was used for statistical analysis. The analysis revealed that perception of corporate CSV activity had a positive effect on job satisfaction of non-permanent(part-time) employees. In particular, it had a positive effect on the relationships between the perception of CSV activity and organizational commitment, as well as organizational commitment and job satisfaction. The mediating effect of organizational commitment and the moderating effect of self-efficacy also had a positive effect. The implication of this study is that the perception of corporate CSV activity plays a crucial role in the current service landscape. Therefore, it is recommended that companies conduct a range of CSV activities and create an inclusive system and organizational culture that encourages active participation of non-permanent employees. ■ keyword :∣CSV Perception∣Job Satisfaction∣Organizational Commitment∣Self-efficacy∣ 접수일자 : 2018년 04월 30일 수정일자 : 2018년 05월 23일 심사완료일 : 2018년 05월 23일 교신저자 : 오상진, e-mail : sjoh@assist.ac. kr 기업의 CSV활동 인식이 비정규직 근로자의 직무만족에 미치는 영향 : 조직몰입의 매개효과와 자기효능감의 조절효과를 중심으로 613
Experimental and theoretical studies of band gap alignment in GaAs1−xBix/GaAs quantum wells

Band gap alignment in GaAs1−xBix/GaAs quantum wells (QWs) was studied experimentally by photoreflectance (PR) and theoretically, ab initio, within the density functional theory in which the supercell based calculations are combined with the alchemical mixing approximation applied to a single atom in a supercell. In PR spectra, the optical transitions related to the excited states in the QW (i.e., the transition between the second heavy-hole and the second electron subband) were clearly observed in addition to the ground state QW transition and the GaAs barrier transition. This observation is clear experimental evidence that this is a type I QW with a deep quantum confinement in the conduction and valence bands. From the comparison of PR data with calculations of optical transitions in GaAs1−xBix/GaAs QW performed for various band gap alignments, the best agreement between experimental data and theoretical calculations has been found for the valence band offset of 52 ± 5%. A very similar valence band offse.
Low-cost solution-processed copper iodide as an alternative to PEDOT:PSS hole transport layer for efficient and stable inverted planar heterojunction perovskite solar cells

Inverted planar heterojunction (PHJ) perovskite solar cells have attracted great attention due to their advantage of low-temperature fabrication on flexible substrates by solution processing with high efficiency. Poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) is the most widely used hole transport layer (HTL) in inverted PHJ perovskite solar cells; however, the acidic and hygroscopic nature of PEDOT:PSS can cause degradation and reduce the device stability. In this work, we demonstrated that low-cost solution-processed hydrophobic copper iodide (CuI) can serve as a HTL to replace PEDOT:PSS in inverted PHJ perovskite solar cells with high performance and enhanced device stability. A power conversion efficiency (PCE) of 13.58% was achieved by employing CuI as the HTL, slightly exceeding the PEDOT:PSS based device with a PCE of 13.28% under the same experimental conditions. Furthermore, the CuI based devices exhibited better air stability than PEDOT:PSS based devices. The results indicate that low-cost solution-processed CuI is a promising alternative to the PEDOT:PSS HTL and could be widely used in inverted PHJ perovskite solar cells.
Laser-initiated Coulomb explosion imaging of small molecules

Momentum vectors of fragment ions produced by the Coulomb explosion of CO 2 (z = 3 − 6) and CS 2 (z = 3 − 13) in an intense laser field (∼50 fs, 1 x 10 W/cm) are determined by the triple coincidence imaging technique. The molecular structure from symmetric and asymmetric explosion channels is reconstructed from the measured momentum vectors using a novel simplex algorithm that can be extended to study larger molecules. Physical parameters such as bend angle and bond lengths are extracted from the data and are qualitatively described using an enhanced ionization model that predicts the laser intensity required for ionization as a function of bond length using classical, over the barrier arguments. As a way of going beyond the classical model, molecular ionization is examined using a quantum-mechanical, wave function modified ADK method. The ADK model is used to calculate the ionization rates of H2, N2 and CO2 as a function of initial vibrational level of the molecules. A strong increase in the ionization rate, with vibrational level, is found for H2, while N2 and CO2 show a lesser increase. The prospects for using ionization rates as a diagnostic for vibrational level population are assessed.
Mussel Byssus‐Like Reversible Metal‐Chelated Supramolecular Complex Used for Dynamic Cellular Surface Engineering and Imaging

Inspired by the load‐bearing biostructures in nature, a multifunctional shell for encapsulating cell using the polyphenol–metal complexes is fabricated. The artificial shell is formed by cross‐linking of tannic acid and iron ion on cell surface. It can protect cells from unfriendly environments, including UV light irradiation and reactive oxygen damage. With the hybrid property of polyphenol and metal liands, the shell provides a versatile platform for cell surface engineering. The magnetic nanoparticles, DNA molecules, as well as the magnetic resonance imaging agents are easily incorporated into the shell. More interestingly, unlike the traditional passive coatings, here the shell can be controllably disassembled under external stimuli. The dynamic coating is used as a reversible element to regulate cell division and surface modification. The cell viability and protein expression experiments further confirm that the shell formation and degradation processes are biocompatible. This multifunctional coating strategy is applicable to multiple living cell types, including yeast cells, Escherichia coli bacteria, and mammalian cells. Therefore, this platform would be useful for living cell based fundamental research and biological applications.
The occultation of beta Scorpii by Jupiter and Io. I - Jupiter.

Use of computer-controlled one-dimensional area-scanning photometers to observe the occultation of the Beta Scorpii system by Jupiter on May 13, 1971. Six high-quality light curves were obtained; three of the occultations of the brighter component Beta Sco A and three of Beta Sco C. The mean scale height of the Jovian upper atmosphere is 32 plus or minus 6 km near -10 deg zenographic latitude, 31 plus or minus 2 km at -47 deg zenographic latitude, and 24 plus or minus 2 km at -57 deg zenographic latitude. The determination of the atmospheric scale height is highly sensitive to the background level subtracted, providing a possible explanation of an earlier result by Baum and Code (1953) placing the scale height at about 8 km. Correlated departures of the light curve from a theoretical isothermal curve are reproduced in the three bright-star curves, and are thus not due to random density fluctuations in the Jovian atmosphere, but are rather due to global stratification. Details of the stratification, which includes at least a number of warm layers, are examined by deconvolution of the light curves. There is evidence for a high-temperature (T greater than 300 K) thermosphere on two of the bright-star light curves.
Rate of Contaminant Bioavailability in Artificial Soil-Water Column Experiments

Bioavailability of organic contaminants is a key parameter in estimating the fate and transport of contaminants in the environment. Its quantification is necessary for assessing the bioremediation potential of a contaminated site or for evaluating the hazard associated with the presence of the contaminant. However, there is a lack of methods that quantify biovailability under flow-through conditions. Therefore, a method was developed based on mass-balance analysis of contaminant breakthrough curves to quantify a bioavailability rate. The method was performed on an eight-column study where pentachlorophenol (PCP) was injected through saturated columns packed with a blend of sterile or inoculated sand and PCP-sorbing resin. Columns varied in sorption capacity, pore-water velocity and biodegradation activity. Breakthrough curves were modeled using a classic approach that includes advection-dispersion, equilibrium and first-order sorption, as well as biodegradation. Results showed that the bioavailability rates (non-dimensional numbers ranging from 0.02 for a sorptive column to 0.32 for a non-sorptive one) were directly related to the limiting kinetic mechanism. It was also demonstrated that the contaminant aqueous phase concentration does not adequately represent its bioavailability under flow-through conditions.
Acid Hydrogen Peroxide Treatment of Norway Spruce TMP: The Effect of an Extended pH Range when Catalyzed by Free Ferrous and Free or EDG/EDTA-Chelated Ferric Ions

Abstract The influence of different types of iron salts (i.e., ferrous or ferric cations with sulphate, nitrate or chloride anions) on the reaction between coarse thermomechanical pulp and acid hydrogen peroxide (Fenton chemistry) was studied when the initial pH was 3.2 and 5.3. Also, ferric ions chelated with EDTA or EDG at different molar ratios were compared with ferrous sulphate when the initial pH was extended from about 3 to 8. Different anions of ferric ion salt gave a similar catalytic effect. At an initial pH of 7–8, the ferric-EDTA catalyzed reaction resulted in similar or higher hydrogen peroxide consumption and more detectable hydroxyl radicals than the ferrous sulphate catalyzed reaction, but less reaction with the pulp was indicated. Between pH 5–8, using Fe-EDG as a catalyst gave higher hydrogen peroxide consumption and more detectable hydroxyl radicals than if using ferrous sulphate; however, the measured effect on the pulp was similar or less.
Inhalation Toxicity of Phosphine for Fischer 344 Rats and B6C3F1 Mice

AbstractBecause of the potential increased use of phosphine (PH3) as a fumigant and the lack of adequate toxicity data, short-term inhalation studies were conducted to characterize the toxicity of PH3 for Fischer 344 (F344) rats and B6C3F1 mice. Male rats and mice were exposed to 0, 1, 5, or 10 ppm PH3 for up to 4 days, and males and females to 0, 1.25, 2.5, or 5 ppm for 2 wk. In the 4-day study, all rats died by the end of the third exposure to 10 ppm, and all mice were euthanized in moribund condition after the fourth exposure to 10 ppm. Clinical pathology data were obtained only for mice, due to early mortality of rats. There were no significant treatment-related effects in hematological indices in mice exposed to 1 or 5 ppm; at 10 ppm there was a moderate anemia, and leukocyte counts were significantly decreased. There were significant biologically relevant increases in serum activity of alanine aminotransferase (ALT) and sorbitol dehydrogenase (SDH) and in the concentration of urine nitrogen (UN) at .
Heat and Entropy of Hydration of α‐NiSO4·6H2O to NiSO4·7H2O. Their Low‐Temperature Heat Capacities

The heat capacities of α‐NiSO4·6H2O and NiSO4·7H2O have been determined over a range 13° to 300°K. These measurements have been combined with available heat‐capacity data on these hydrates extending to 1°K. Heats of solution of the two hydrates give α‐NiSO4·6H2O+H2O(l)=NiSO4·7H2O , ΔH298. 15°K=−1836±25 cal/mole. For the reaction NiSO4·7H2O=α‐NiSO4·6H2O+H2O(g) , at 25°C P(equil.)=21.0 torr, ΔF°=2126 cal/mole, ΔH°=12 356 cal/mole and ΔS°=34.31 gibbs/mole. From the heat‐capacity data, the known entropy of H2O(g) and the third law of thermodynamics, ΔS°=34.47 gibbs/mole at 25°C, in good agreement. Tables of CP°, S°, (H°–H0°)/T, and (F°–H0°)/T of α‐NiSO4·6H2O and NiSO4·7H2O are included.
Phytoecdysone und Iridoide aus Vitex megapotamica

Aus Vitex megapotamica wurde ein neues Phytoecdyson [Viticosteron E] isoliert, für das die Struktur V vorwiegend mit spektroskopischen Methoden ermittelt wurde. Vier weitere Phytoecdysone und ein Iridoid wurden als Ecdysteron (I), Inokosteron (II), Polypodin B (III), Pterosteron (IV) und Agnusid (VI) identifiziert.
Compactação do solo na cultura do feijoeiro. I: efeitos nas propriedades físico-hídricas do solo

O problema de compactacao do solo vem aparecendo sistematicamente na regiao do Cerrado, onde os sistemas convencionais de manejo do solo tem causado desagregacao excessiva da camada aravel, o encrostamento superficial e a formacao de camadas coesas ou compactadas (pe-de-grade ou pe-de-arado). Como alternativa, os agricultores adotaram o Sistema Plantio Direto; entretanto, em varias situacoes vem sendo relatadas ocorrencias de aumento da densidade do solo e diminuicao da macroporosidade, o que tem sido diagnosticado como compactacao, fazendo com que o agricultor seja obrigado a movimentar o solo. Este trabalho teve por objetivo verificar como a compactacao do solo afeta as suas propriedades fisicas e de transmissao de agua. Para isto, utilizaram-se colunas de solo compactadas artificialmente, para produzir densidades do solo de 1,0; 1,2; 1,4 e 1,6 kg dm-3. As propriedades de transmissao de agua foram determinadas com infiltrometros de tensao, para as cargas de pressao de -0,5; -2,0 e -6,0 cm de agua. O aumento da densidade do solo aumentou sua resistencia a penetracao e reduziu linearmente a porosidade total e a macroporosidade. Houve ainda, reducao no tamanho dos poros para o fluxo de agua, reduzindo a condutividade hidraulica do solo. Esta reducao foi mais acentuada na maior carga de pressao testada. Com a carga de pressao de -2,0 cm de agua, a reducao no tamanho dos poros foi parcialmente compensada com aumento do seu numero. O metodo do infiltrometro de tensao mostrou-se adequado em distinguir diferencas nas propriedades de transmissao de agua de um solo submetido a diferentes niveis de compactacao.
Experiences of emergent change from an applied neurosciences perspective

Orientation: Traditional models of planned change are no longer sufficient, amidst constantly changing contexts. Applied neurosciences provides a unique, integrated perspective on human functioning. This study employed a neuroscientific perspective to explore participants’ experiences of the neurobiological impact of emergent change.Research purpose: This study explored participants’ experiences of emergent change from an applied neurosciences perspective.Motivation for the study: The impact of emergent change on employees has been underestimated and under-represented in both the literature and practice. Exploring the original voices of employees, as well as the underlying neural mechanisms and their dynamic interactions that shape these experiences, offers new insights into this complex phenomenon.Research approach/design and method: Nine client-facing employees from a software development company in South Africa, selected through purposive sampling, participated in an interactive qualitative analysis (IQA) focus group and follow-up interviews. Data were collected and analysed by the participants, in keeping with the IQA protocol.Main findings: Experiences of emergent change were found to threaten individuals’ and teams’ basic psychological needs, with a significant impact on the physiological, emotional and interpersonal levels. The participants’ experiences reflected a dysregulation in mental operating network activation, in response to their compromised needs.Implications for practice: The findings imply the need for interventions to enhance employees’ resilience during emergent change by developing the internal stability and external adaptability of their mental operating networks. This aligns with developments related to well-being in the neuroscience literature.Contribution/value add: The study provides an insight into individuals’ and teams’ experiences of emergent change, which can be used to inform new approaches for research-informed interventions and practices aligned with applied neurosciences.
Oxidation of Si3N4 in the Range 1300° to 1500°C

The isothermal oxidation behavior of commercial hot-pressed Si3N4 was evaluated for temperatures from 1300° to 1500°C. Multiphase scales were formed, consisting mainly of α-cristobalite and enstatite. A large increase in reaction rate above 1450°C is believed to be caused by melting in the scale and the consequent increase in the rate of oxygen transport. No oxygen pressure dependence was observed at 1400°C over the oxygen pressure range 10-9 atm to 600 torr. However, a small decrease in the kinetics was observed when measurements were made in reduced total pressures of oxygen as compared to O2/N2mixtures at a constant total pressure.
Glass Transition Temperature as a Function of Conversion in Thermosetting Polymers

A simple equation to model the dependence of the glass transition temperature (T g ) on the extent of reaction in highly cross-linked thermosetting polymers has been derived. The model assumes that the increase in T g is caused by (a) decrease in chain-end concentration, (b) formation of effective cross-links, and (c) further decrease in the configurational entropy due to departure from Gaussian behavior at high cross-link densities