Miracle-dz/UniFAR-FTUs huggingface dataset:
Characterization of High-Strength Packaging Steels: Obtaining Material Data for Precise Finite Element Process Modelling

The steadily increasing demand for downgauging to reduce costs in packaging steel applications requires the development of high-strength packaging steel grades to meet strength requirements. At the same time, the demand for a simulative, computer-aided layout of industrial forming processes is growing to reduce costs in tool constructions for downgauging manners. As part of this work, different high-strength packaging steels were characterized for use in a finite element based process layout and validated using application-oriented experiments. Due to a low hardening rate and the occurrence of Lüders bands, high-strength packaging steels show a low amount of elongation in tensile tests, while for other stress states higher degrees of deformation are possible. Thus, common extrapolation methods fail to reproduce the flow curve of high-strength packaging steels. Therefore, a new approach to extrapolate the flow curve of high-strength packaging steels is presented using the tensile test and bulge test data together with a combined Swift–Voce hardening law. Furthermore, it is shown that the use of complex anisotropic yield locus models such as Yld2000-2d is necessary for high-strength packaging steels in order to be able to precisely simulate application-oriented loads in between plane strain and biaxial tension in validation experiments. Finally, the benefit of a material selection process for packaging steel applications guided by finite element simulations based on precisely characterized material behaviour is demonstrated.
Crystal and molecular structures of two N-derivatives of Cα,α-diethylglycine

The crystal and molecular structures of N-formyl-C"-''-diethylglycine (1) and N-benzyloxyGarbonyl-C'-diethylglyclne (2) have been determined by X-ray diffraction techniques. The Compounds possess the following Parameters: (1) monoclinic, space group C2/c (No. 15), a = 12.062(2) k , b = 7.675(1) Ä, c = 19.609(2) k , ß = 92.0(2)°, and Z = 8; (2) monoclinic, space group P2,/n (No. 14), a = 11.111(2) k,b = 14.189(2) A, c = 9.425(2) k , ß = 97.7(2)°, and Z = 4. The crystal structures were solved by direct methods. The least-squares refmements led to R values of 0.052 and 0.060 for 1595 and 1630 reflections with F^ la{F) for (1) and (2), respectively. The conformation of the C-"-diethylglycyl residue is fully extended in the two derivatives. The dispositions of the amide group in (1) and of the urethane moiety in (2) are those commonly observed in analogous Compounds.
The association between romantic competence and couple support behaviors in emerging adult couples

This study examined the association between romantic competence and observed couple social support behaviors in a sample of 89 emerging adult mixed-gender couples (M age = 20.65 for men, 20.16 for women). Across analyses, findings generally indicated that higher romantic competence was associated with both seeking and providing support in a more positive and less negative manner, even when controlling for attachment security, relationship satisfaction, and relationship length. The findings extend our understanding of how romantic competence affects dyadic processes, and identifies romantic competence as a novel target underlying the ability to effectively seek and provide support. Clinical implications for relationship education programs as well as psychotherapy that may be focused on improving relationship functioning is discussed.
On the Simultaneous Improving of Strength and Elongation in Dual Phase Steels via Cold Rolling

The ferrite-pearlite microstructure was cold-rolled to form dual phase (DP) steels, the percentage reduction of which varied. To do so, the steels were annealed in two steps and then the workpiece underwent water quenching. Accordingly, a decrease was observed in the average size of the ferrite grains, from above 15 µm to below 2 µm, subsequent to the thermomechanical processing. By an increase in the reduction percentage, the volume fraction of martensite grew. The balance between strength and elongation also improved nearly 3 times, equivalent to approximately 37,297 MPa% in DP in comparison to 11,501 MPa% in the ferrite-pearlite microstructure, even after 50% cold-rolling. Based on Hollomon and differential Crussard-Jaoul (DC–J) analyses, the DP steels under investigation deformed in two and three stages, respectively. The modified C–J (MC–J) analysis, however, revealed that the deformation process took place in four stages. The rate of strain hardening at the onset of the deformation process was rather high in all DP steels. The given rate increased once the size of the ferrite grains reduced; an increase in the volume fraction of martensite due to larger percentage of reduction also contributed to the higher rate of strain hardening. The observation of the fractured surfaces of the tensile specimens indicated ductile fracture of the studied DP steels.
Denitrification in Cultivated and Noncultivated Riparian Areas of Grass Cropping Systems

The factors that affect denitrification of fertilizer N were determined in cultivated riparian (CR) soils cropped to perennial ryegrass (Lolium perenne L.) and noncultivated naturally vegetated riparian soils (NCR) of poorly drained grass cropping systems in western Oregon. Denitrification activity in the NCR was low compared with the CR using the Acetylene Inhibition method. The CR soil denitrification activity was consistent over the growing season, averaging between 269 and 280 g N 2 O-N ha -1 d -1 during the measurement period depending on soil type. Denitrification activity was positively correlated to soil NH 4 -N level in the CR. The greater denitrification activity of the CR likely reflects fertilizer applications in contrast to no fertilizer addition to the NCR. Nitrate-N levels in the CR averaged 5 to 12 times higher than those of the NCR. Nitrate did not appear to encroach from the CR into the NCR by subsurface water movement. The microbial biomass was four times larger in the NCR soils and may have functioned as a significant sink for N reducing denitrification activity. Multivariate factor analysis using orthogonal factor rotation showed that approximately 83% of the observed variance in denitrification was explained by grouping experimental variables by microbial activity, N 2 O-N emission, temperature, and nitrification. The grouping of soil variables was useful in explaining the importance of different soil processes in regulating denitrification. These denitrification activity data demonstrate the possibility for significant N losses, amounting to 12.5% of the applied fertilizer N, from poorly drained cropping systems.
Sorption/desorption, diffusion, and swelling characteristics of geomembranes in the presence of halo-organic liquids

Sorption/desorption results of halogen-containing liquids into high-density polyethylene, linear low-density polyethylene, very low-density polyethylene, and polypropylene geomembranes are presented at 25, 50, and 70°C. Sorption results are obtained by a gravimetric method, and diffusion coefficients have been calculated by using Fick's equation from the initial linear portions of the sorption/desorption curves. Swelling of the geomembranes was studied from a measurement of the increase in volume, thickness, and diameter. From a temperature dependence of sorption and diffusion coefficients, the Arrhenius parameters have been calculated. Liquid concentration profiles have been computed using Fick's equation for the appropriate initial and boundary conditions. The results of this study may have relevance in selecting the suitable geomembrane for a specific application in hazardous waste chemical ponds and other similar situations.
Physicochemical properties of small metal particles in solution: "microelectrode" reactions, chemisorption, composite metal particles, and the atom-to-metal transition

The study of nanometer and subnanometer colloidal metal particles in aqueous solution complements the investigation of small particles in molecular beams, frozen solutions, and inorganic clusters. The electronic properties of the metal particles are changed by surface modification, for example by chemisorption of a nucleophilic molecule or by deposition of a second metal. The resulting changes in the chemical, photochemical, and optical properties are discussed. Methods are described which enable one to store excess electrons or positive holes on the particles in a controlled manner and to investigate the accompanying changes in the optical properties. Metal particles carrying excess electrons initiate electrochemical reactions such as the reduction of water or the deposition of metals
Short selling disclosure and its impact on CDS spreads

The European Union introduced Regulation 236/2012 in 2012 to address short selling and certain aspects of credit default swaps (CDS). Consequently, a uniform short position disclosure regime was developed, which is used in this paper to examine CDS spreads as a proxy for credit risk around public short sale announcements and evaluate the disclosure policy's relevance from the debtholder's perspective. Existing literature documents short selling regulations’ impacts on the stock market, but no evidence exists from the CDS market. Therefore, we first conduct an event study to examine the effects of different short sale events on corresponding firms’ CDS spreads between 2012 and 2018. Moreover, we use regression analyses to control for several credit risk determinants that may also affect CDS spreads. Our evidence suggests that opening and increasing short positions are perceived as negative information, and in this regard lead to higher CDS spreads. In contrast, CDS spreads tend to be lower if short positions decrease or close. Additionally, we find that negative information ceteris paribus more strongly affects CDS spreads than positive information. Finally, we investigate certain anticipatory reactions when negative news enters the CDS market.
Effects of body weight and posture on pulmonary functions in asthmatic children

Background Asthma is one of the most common chronic illnesses in the world. Pulmonary function tests are important tools in monitoring of asthmatic patients. There is need for investigating if spirometric indices were affected by body weight or posture or not. Objectives The aim of this study was to evaluate the spirometric measurements in standing and sitting positions in a group of Egyptian asthmatic children with different body weights. Methods Sixty patients were included. They were stable asthmatics and were following up in the allergy clinic. Spirometry was conducted at pulmonary functions laboratory of Pediatric Allergy and Chest Unit of New Children's University Hospital, Cairo. The one-way analysis of variance was used to test the differences between groups. The Duncan multiple comparison test was used to test the significant differences between each pair of groups. Results The study found that sitting FEV1/FVC is significantly lower in overweight/obese asthmatic children compared to normal weight asthmatic children (p value=0.046). Conclusion There was no effect of weight on standing spirometric data. Weight showed significant negative correlation with asthma control level. We concluded that in overweight/obese asthmatic children, spirometric position might affect the results.
Familial Interdependence, Socioeconomic Disadvantage, and the Formation of Familial Mentoring Relationships Within Black Families

This study used an explanatory sequential mixed-method design to explore the association between familial interdependence and familial mentoring relationship presence within black families. This study also examined how socioeconomic disadvantage may moderate the association between familial interdependence and familial mentoring presence. A sample of 216 black youth (59% girls; 41% boys) were surveyed, and a subsample of 25 participants were interviewed along with one of their parents, and one nonparental familial adult with whom the youth reported feeling emotionally close to learn more about the enactment of familial interdependence and the formation of familial mentoring relationships across social class. Logistic regression analyses revealed that greater valuing of familial interdependence was associated with a greater likelihood of having a familial mentoring relationship, but this association was present only among nonsocioeconomically disadvantaged youth. Data collected from participant interviews were analyzed to better understand this pattern of findings. These analyses provided some preliminary insights into why familial interdependence may predict familial mentor formation only among nonsocioeconomically disadvantaged youth. Implications of study findings for the promotion of familial mentoring relationships within black families are discussed.
A Gravity Search for Oil and Gas and Groundwater in Egypt Using the Strike Angles Derived from EIGEN 6C4

We correlate the gravity aspects (descriptors), namely the strike angles, derived from a recent gravity field model, with the known oil, gas and groundwater deposits/reservoirs and hypothetical paleolakes with the locations of archaeological sites. This allows us to extrapolate the investigation, by analogy, to unknown regions. The gravity aspects, derived from the EIGEN 6C4 gravity field model, are used, together with EMAG 2 magnetic anomalies and ETOPO 1 topography model, for the investigation of oil, gas and water deposits in Egypt. One of the gravity aspects, s/c strike angle, is significantly combed (oriented in one direction locally) in places where the known deposits exist. However, they are combed also in some other places. This may be used as a guide as to where to seek new and promising deposits. Accounting for the combed strike angles and the relationship between gravity anomalies and height differences, we reconstructed potential paleolakes under thick sand layers in the Great Sand Sea, Western Egypt (our previous work), and between Kharga and Toshka, Southern Egypt (this work), consistent with the known archaeological sites.
An Updated Assessment of Near‐Surface Temperature Change From 1850: The HadCRUT5 Data Set

We present a new version of the Met Office Hadley Centre/Climatic Research Unit global surface temperature data set, HadCRUT5. HadCRUT5 presents monthly average near‐surface temperature anomalies, relative to the 1961–1990 period, on a regular 5° latitude by 5° longitude grid from 1850 to 2018. HadCRUT5 is a combination of sea‐surface temperature (SST) measurements over the ocean from ships and buoys and near‐surface air temperature measurements from weather stations over the land surface. These data have been sourced from updated compilations and the adjustments applied to mitigate the impact of changes in SST measurement methods have been revised. Two variants of HadCRUT5 have been produced for use in different applications. The first represents temperature anomaly data on a grid for locations where measurement data are available. The second, more spatially complete, variant uses a Gaussian process based statistical method to make better use of the available observations, extending temperature anomaly estimates into regions for which the underlying measurements are informative. Each is provided as a 200‐member ensemble accompanied by additional uncertainty information. The combination of revised input data sets and statistical analysis results in greater warming of the global average over the course of the whole record. In recent years, increased warming results from an improved representation of Arctic warming and a better understanding of evolving biases in SST measurements from ships. These updates result in greater consistency with other independent global surface temperature data sets, despite their different approaches to data set construction, and further increase confidence in our understanding of changes seen.
An Active FTC Strategy Using Generalized Proportional Integral Observers Applied to Five-Phase PMSG based Tidal Current Energy Conversion Systems

In recent years, multi-phase permanent magnet synchronous generators (PMSGs) have become attractive in the field of tidal current energy conversion systems (TCECS) due to their high-power density, reliability, and availability. However, external disturbances and malfunctions in power conversion chains will bring challenges to achieving stable and continuous tidal current energy harnessing. Using generalized proportional integral observers, an active fault-tolerant control (AFTC) strategy is therefore proposed for a five-phase PMSG based TCECS that is subjected to an open switch fault (OSF) in the generator side converter. This proposed AFTC strategy is applied into q-axis current control loops, which contain fault detection and compensation. The fault compensator will be smoothly activated using a sigmoid function once the OSF is detected. Finally, a small-scale power experimental platform emulating the TCECS is established in order to verify the feasibility and efficiency of the proposed FTC strategy. Experiment results show that this AFTC strategy can detect faults rapidly and effectively attenuate torque ripples in the post-fault operation mode.
Mechanistic Aspects of Phenol Electrochemical Degradation by Oxidation on a Ta / PbO2 Anode

The electrochemical oxidation of phenol in an aqueous solution is a complex transformation involving several transfer steps of oxygen atoms and electrons. Transfer of the oxygen atom occurs through the intermediary of hydroxyl radicals adsorbed on the active sites of the anode. Galvanostatic electrolyses of phenol (10.5 to 105 mmol/dm{sup 3}) in aqueous solution at pH 2 on a Ta/PbO{sub 2} anode were followed by high-pressure liquid chromatography and by analysis of the total organic carbon. Hydroquinone, catechol, 1,4-benzoquinone (1,4-BQ), maleic and fumaric acids, and carbon dioxide are the main products. The nonidentified products consist mainly of polymers. Study of the influence of temperature shows that the rate consumption of phenol initially at 21 mmol/dm{sup 3} is mass transport limited. CO{sub 2} is immediately formed following the 1,4-BQ-maleic acid pathway involving 20 faradays and forming 4 mol of CO{sub 2} and/or the 1,4-BQ-intermediary in C2 pathway at 16 faradays with formation of 2 mol of CO{sub 2}. The faradaic yield values show that a phenol molecule adsorbed on a catalytic site undergoes a succession of oxidation steps involving, on average, five electrons without desorption of the intermediate products. This number of electrons varies according to the operating conditions (temperature, anodicmore » current density, initial phenol concentration, hydrodynamic conditions, etc.). The mean faradaic yield decreases during electrolysis; it can reach 70% at the beginning of electrolysis of a 21 mmol/dm{sup 3} phenol solution for an anodic current density of 100 mA/cm{sup 2}. The phenol conversion into insoluble polymers increases as a function of its initial concentration and the anodic current density but it does not exceed 10%. « less
From the teachers’ perspectives: resources used in teaching reading comprehension to English First Additional Language (EFAL) learners in the FET phase

ABSTRACT At most, schools in South Africa, the learners’ performances in English first additional language (EFAL) reading comprehension are a source of worry for stakeholders. The majority of these learners are EFAL speakers. To counteract this discomfort, effective and appropriate resources in the teaching of reading comprehension become handy. This study aimed to investigate the resources used in teaching reading comprehension to EFAL learners in the FET phase. The study employed a qualitative research design, semi-structured interview, to collect data. The sampling frame was six EFAL teachers in South Africa. The results of the study show that EFAL teachers in the FET phase use many resources to teach reading comprehension, which include the dictionary, textbooks, WhatsApp, the parents and videos. The challenges faced by learners in reading comprehension include overuse of the dictionary, a narrow vocabulary base and inability to skim and scan accordingly. It becomes imperative for EFAL to promote an enabling classroom environment so that learners’ reading comprehension skills are developed. Teachers need to understand that a deep comprehension is achieved when a reader progresses beyond literal comprehension to using the text combined with prior knowledge to construct understanding.
Implementation of a dark hole maintenance algorithm for speckle drift in a high contrast space coronagraph

Due to the limited number of photons, directly imaging planets requires long integration times. The wavefront must be stable on the same time scale which is often difficult in space due to thermal variations and vibrations. In this paper, we discuss the results of implementing a dark hole maintenance (DHM) algorithm (Pogorelyuk et. al. 2019)1 on the High-contrast imager for Complex Aperture Telescopes (HiCAT) at the Space Telescope Science Institute (STScI). The testbed contains a pair of deformable mirrors (DMs) and a lyot coronagraph. The algorithm uses an Extended Kalman Filter (EKF) and DM dithering to predict the drifting electric field in the dark hole along with Electric Field Conjugation to cancel out the drift. The DM dither introduces phase diversity which ensures the EKF converges to the correct value. The DHM algorithm maintains an initial contrast of 8.5 x 10-8 for 6 hrs in the presence of the DM actuator random walk drift with a standard deviation of 1:7 x 10-3 nm/s.
Imaging and manipulation of adsorbed Pb adatom structures on the Si(100) surface by noncontact atomic force microscopy

We performed imaging and manipulation of epitaxially grown Pb adatom structures on the Si(100) surface by non-contact atomic force microscopy (NC-AFM) in ultra-high-vacuum (UHV) and at cryogenic temperatures. We observe several distinct contrast modes during imaging, which we assign to termination of the scanning probe tip by either a single Si, or single Pb, atom, via quantitative comparison of atomic resolution force spectroscopy experiments with ab initio density functional theory (DFT) simulations. We show that the Pb adatom structures can be controllably manipulated via mechano-chemical means, and identify a novel semi-deterministic manipulation strategy that arises from the combination of low temperature operation and the asymmetric diﬀusion barriers present on the Si(100) surface.