Miracle-dz/UniFAR-FTUs huggingface dataset:
Elastic moduli of the crystal lattices of polymers

Elastic moduli of the crystalline regions in high polymers have been studied. Oriented specimens were used throughout. Lattice strains were measured by an x-ray technique in the direction of the fiber axis as well as in that perpendicular to the fiber axis. The moduli for both directions were calculated on the basis of the assumption that the stress is homogeneous within a specimen held under a load. Remits obtained for various kinds of polymers were discussed in terms of the crystal structures of the polymers, pan icularly the skeleton conformation and the cross-sectional bulkiness of the chain molecule in the crystal. It was shown that the moduli in the direction of the fiber axis are widely different depending upon the polymer. They vary from 240 × 104 kg. /cm.2 for polyethylene to 4.1 × 104 kg. /cm.2 for isotactic poly (vinyl tert-butyl ether). In the direction perpendicular to the fiber axis, the moduli were shown to take values within a narrow range of magnitude, 3–9 × 104 kg. /cm.2. Some of these moduli were compared with the calculated values reported by several authors. To find experimental support for the assumption of the homogeneous stress, measurements were made by using several oriented specimens of different fine textural structures. Inherent values of the lattice moduli were obtained, regardless of the specimens used, which gives a strong support for the assumption.
Modelling of Growth Rate for MSMPR Crystallizer Data

One of the most important applications of the population balance approach to MSMPR crystallizer modelling is the recovery of crystal nucleation and growth rates data from steady-state crystal size distributions (RANDOLPH, LARSON). A large number of studies have confirmed that both size-dependent (growth rate is a function of crystal size) and growth rate dispersion (crystals of the same size do not have the same growth rate), causes nonlinearities which limit the usefulness of the RANDOLPH and LARSON approach. A discussion of modelling of crystal growth kinetics for simulated and real MSMPR crystallizer data is presented. In the former case, both linear and non-linear log population density distributions are used. The modelling of growth kinetics is done twice – once assuming that growth rate dispersion is a source of curvature in the log population density vs size data plot and, again when this curvature is caused by size-dependent growth. Calculations clearly indicate that even for crystallizing systems which follow the McCabe's δL law, both growth rate dispersion and size-dependent growth models lead to proper estimation of growth kinetics. When log population density vs size data plots exhibit curvature, however, use of the size-dependent growth rate approach gives more reliable growth kinetics across a broad crystal size range than those obtained from modelling of growth kinetics by growth rate dispersion.
Hen egg white lysozyme-metal ion interactions: investigation by electrospray Ionization Mass Spectrometry

The present paper reports the first investigation of HEL interactions with metal ions using a powerful technique, namely electrospray ionization mass spectrometry (ESI-MS). The protonation states are the same with a HEL-metal ion mixture as with HEL taken alone. HEL binds from 1 to 8 ions of Cu 2+ , where the ratios of Cu 2+ varied from 1 to 86 ions of Cu 2+ per molecule of HEL within the mixture. HEL was also able to bind from 1 to 6 ions of Zn 2+ when the ratio of this metal ion varied in the same manner as copper. No effect on the enzyme activity was provoked by Cu 2+ or Zn 2+
Classification for Glucose and Lactose Terahertz spectra based on SVM and DNN methods

We propose an approach based on support vector machine(SVM) and deep neural networks (DNN) to classify chemical substances under different experimental conditions in terahertz time-domain spectroscopy (THz-TDS). 372 groups of independent signals under different conditions were measured to provide a sufficient training set. 99% accuracy for the SVM and 89.6% for the DNN method are realized in the test set. These excellent classification results show the high potentials in chemical recognition, security detection or clinical diagnosis.
Polyfunctional active coatings with damage-triggered water-repelling effect

New smart anticorrosion coatings based on a combination of passive and active parts were developed. The active part is presented by polyurethane microcontainers loaded with alkoxysilanes possessing a long hydrophobic tail. High efficiency of the coating is achieved by the combination of passivating and water-repelling properties of the loaded material.
Unidirectional crystal growth and crystalline perfection of L-arginine phosphate monohydrate

A large (∼20 mm diameter and 80 mm length) single crystal of l-arginine phosphate monohydrate (LAP) has been grown for the first time by the unidirectional Sankaranarayanan–Ramasamy method in an aqueous medium in a specially designed constant-temperature bath. The crystal structure has been confirmed by powder X-ray diffraction. The crystalline perfection was assessed by high-resolution X-ray diffractometry (HRXRD) which found that the quality of the grown single crystal is quite good. HRXRD studies along different directions show that the crystal contains a low density of edge-type dislocations formed along the growth direction. The thermal stability was assessed using thermogravimetric/differential thermal analysis. The mechanical behaviour was studied using an Omnitech micro-hardness tester. The dielectric studies were carried out over a wide frequency range of 10 Hz to 5 MHz at room temperature. The characterization studies reveal that the grown bulk single crystal of LAP is suitable for device applications.
More elections, more burden? On the relationship between elections and public debt in Africa

The political determinants of public indebtedness in developing countries is still generating a lot of interest among academics and policy makers. This paper investigates whether elections influence the public debt dynamics relying on data from 51 African countries spanning 1990 to 2015. The analyses are conducted using the fixed effects and the system Generalized Method of Moments (GMM). The results reveal that although all types of elections increase public debt, only the impact of the presidential elections are significant. The findings are robust irrespective of the estimation technique. The paper recommends African countries to rationalize public resources, particularly in the election years.
Development of a new force field for property prediction of cyclo-olefin copolymers

The applicability of the Dreiding 2.21 and PCFF force fields to the prediction of properties of cyclo-olefin copolymers was evaluated. The initial performance of the force fields was only modest, and reoptimization of the force field parameters was required. The reoptimization was performed for the Dreiding 2.21 force field by fitting the force field to the potential energy curves of B3LYP/6-31G* calculations. The modifications to the force field resulted in a considerable improvement, bringing the calculated mechanical and thermal properties close to the experimental values. Experimental substructures for polymer fragments were obtained from the Cambridge structural database. Theoretical potential energy minima were found to be in good agreement with the experimental structural data.
Childbearing among women with Polish migrant background in Sweden: A combined origin-destination country approach

This paper examines childbearing among Polish migrant women and their descendants in Sweden. Unlike most studies on migrant fertility, we do not rely solely on a comparison between different migrant generations and the natives in the country of destination. Instead, we also consider the non-migrants in the country of origin. This unconventional country-of-origin and country-of-destination approach is preferable to more carefully examine the relevance of three migrant fertility hypotheses, namely the socialization, the selection and the adaptation hypotheses. Based on a piecewise-exponential model, the transitions to first and second births are analyzed using Swedish register data and the Polish Generations and Gender Survey (GGS). The results show that the Polish stayers and the first-generation Polish immigrants are similar in terms of the timing of births but are more different in terms of quantum. Selection into migration and compositional differences can, to some extent, explain both similarities and differences between the first-generation migrants and the Polish stayers and Swedish natives. For example, when introducing cohort in the second-birth analysis, the socialization hypothesis is confirmed for the younger cohorts. Examining the second-generation in relation to the Swedish natives, we find convergence of fertility behavior across migrant generations both in terms of quantum and timing.
The Modified Yen Model

Asphaltenes, the most aromatic of the heaviest components of crude oil, are critical to all aspects of petroleum use, including production, transportation, refining, upgrading, and heavy-end use in paving and coating materials. As such, efficiency in these diverse disciplines mandates proper chemical accounting of structure−function relations of crude oils and asphaltenes, the vision of petroleomics (Asphaltenes, Heavy Oils and Petroleomics; Mullins, O. C., Sheu, E. Y., Hammami, A., Marshall, A. G., Eds.; Springer: New York, 2007). Indeed, the molecular characterization of asphaltenes is required as well as the detailed understanding of the hierarchical colloidal structures of asphaltenes and petroleum. With great prescience, Professor Teh Fu Yen and co-workers proposed a hierarchical model of asphaltenes to account for many of their characteristics known at that time (Dickie, J. P.; Yen, T. F. Macrostrucutres of asphaltic fractions by various instrumental methods. Anal. Chem. 1967, 39, 1847−1852). This m.
A low-temperature structural phase transition in β-MoTe2

Abstract High-precision X-ray measurements on crystals of the layered dichalcogenide β-MoTe2 have revealed a structural transition at approximately 250 K. The transition from the monoclinic room-temperature form is accompanied by a discontinuous change of the monoclinic angle β from 93°55′ to 90°, with substantial thermal hysteresis and coexistence of high- and low-temperature phases. The low-temperature structure is the result of a shear deformation of the layers perpendicular to the c axis.
Teacher Crisis: Critical Events in the Mid-Career Stage

To understand the ways in which teachers in the mid-career stage might be retained and maintained in the classroom and the profession, this article identifies the critical events in the journey of the mid-career teacher. The findings of a qualitative study that drew on narrative inquiry are used to explore the reasons why 20 midcareer teachers in Queensland, Australia, exited or remained in the classroom and/or profession. The article concludes with a profile of the mid-career teacher which helps to understand how to provide and/or develop job satisfaction and motivation and retain the knowledge, experience and skills of experienced teachers.
FoliometriK: aplicación en lenguaje R para mediciones morfométricas automatizadas de hojas a partir de fotografías digitales

Foliar morphometric studies usually are limited by the need of processing many samples. That is why the process automation represents an advantage. We present FoliometriK as an open application integrated into an R app for obtaining automatic morphometric measurements of plant leaves using digital pictures and calibrated with a reference scale. The app allows obtaining eight primary lineal variables (blade area, perimeter, length, maximum width, the height of maximum width and width at three main axis percentile) and four angles (apical, basal and lateral). In basallobed leaves, other variables can be obtained: length from apex to top of the basal lobes, lobes depth, width at petiole, angle between lobes and relative lobes area. From these variables two relative indexes are calculated: a shape index and a lateral asymmetry index. For geometric morphometry analysis we also include principal component scores from contour Fourier descriptors and contour landmarks fixed by radial grid (at constant angles) or parallel grid (equally spaced). Algorithm for image processing and variable calculation was designed in a friendly HTML interface, integrated into an R app, and validated with a 40 leaves sample of Avicennia germinans ( Avicenniaceae ), obtained from field samples and manually measured, at the same time, with a Vernier caliper and in ImageJ . Differences among manual measures or by ImageJ tools and those obtained by using the R app were less than 3 %, but time of data gather and final variances were markedly reduced. We conclude that FoliometriK application permit to extract in a fast way, with precision and semi automatically a high variety of measurements from simple and relatively symmetric leaves, so it is expected that help to promote ecomorphological, taxonomic or phenotypic trait studies in natural populations. Citation: Ramirez-Arrieta, V.M. & Denis, D. 2020. FoliometriK: aplicacion en lenguaje R para mediciones morfometricas automatizadas de hojas a partir de fotografias digitales. Revista Jard. Bot. Nac. Univ. Habana 41: 15-23. Article history : Received 18 March 2020. Accepted: 3 April 2020. Online: 3 June 2020. Editor: Jose Angel Garcia-Beltran.
Quiet Fires Fail to Impress: Introverted Expressions of Passion Receive Less Social Worth

Thinking of passionate people typically brings to mind their vivacious expressions. Prior research has shown that such outward manifestations of passion are often met with increased admiration and support by others. But not everyone may express their passion so animatedly. Drawing on personality research, we argue that vivacious expressions of passion capture only a narrow set of passion expressions: those characteristic of extraversion. We suggest that passion is also expressed in ways more aligned with introversion. Based on emerging sociological perspectives, we subsequently propose that introverted expressions of passion are rewarded less social worth than extraverted expressions of passion. We provide empirical support across four studies with full-time employees (N=1,060), including a study of subordinate-supervisor pairs. Our theory and results highlight that interpersonal effects of passion depend on how passion is expressed, whereby those who express their passion extravertedly—but not introvertedly—are more likely to reach higher organizational echelons.
Design Configuration of Water Quality Monitoring System in Surabaya

Water have been important needs for human life in many sectors such as in industry, agriculture, and household that its quality must be conserved so is in Surabaya city. The quality of water could influence the quality of human life directly, thus it is important to have an integrated water quality monitoring system. Information regarding water quality monitoring such as pH, dissolved oxygen, turbidity, and conductivity were collected to produce a periodic decision for controlling, analyzing, and fixing the condition of the water. This paper proposed a design configuration of water quality monitoring system for tap water in Surabaya. First, a comparison study of water quality monitoring technology in terms of area, parameter, and methodology from the previous researchers is presented. From the study, the design configuration of water quality monitoring system to be implemented in Surabaya is concluded. The data collection method is better to be done by using Internet of Things (IoT) technology where it is possible to do multiple data type and multiple point real-time data collection throughout the water distribution network remotely.
On using Conversational Interfaces to Improve the Accessibility of a University Campus

Moving around a university campus may seem an activity of little importance: students are young, they walk and run without problems, with a simple glance they know where they are and where to go, they understand where a lesson is held, when a teacher is available or where to go when they are hungry. Activities that millions of students do every day. But what about students with some form of physical impairments? For them, moving around a university campus is a daily challenge. Can conversational interfaces improve the accessibility of a University campus? is the research question we address in this study. We involved students (with and without disabilities) in the development and evaluation of a skill for the Amazon Alexa platform. Results show that conversational interfaces are highly appreciated by most of the participants and confirm that such interfaces might improve the daily experience of users within a university campus.
Viscosity of aqueous solutions of n-methyldiethanolamine and of diethanolamine

Aqueous solutions of alkanolamines such as monoethanolamine (MEA), diethanolamine (DEA), N-methyldiethanolamine (MDEA), di-2-propanolamine (DIPA), and bis[2-(hydroxyamino)ethyl] ether (DGA) are good solvents for the removal of acid gases such as CO[sub 2] and H[sub 2]S from the gas streams of many processes in the natural gas, petroleum, ammonia synthesis, and some chemical industries. The viscosity of aqueous solutions of methyldiethanolamine (MDEA) and of diethanolamine (DEA) have been measured at five temperatures in the range 25--80 C throughout the whole concentration range. The viscosity has been correlated as a function of composition for use in industrial calculations.
Heat Transfer Characterization of Metallic Foams

Gas−solid heat transfer coefficients were determined in open-celled metal foams as part of a study aimed at evaluating the application of metal foams as catalyst supports in gas−solid catalytic processes with short contact times and high reaction rates, typically controlled by diffusional mass transport. Examples of such processes are found in the field of environmental catalysis, including, for example, catalytic combustion, selective catalytic reduction of NOx by NH3 (SCR-DeNOx), automotive exhaust gas after treatment, and also in the catalytic partial oxidation of hydrocarbons for syngas or H2 generation processes. In this work, foam samples made of FeCrAlloy and Cu with nominal porosities of 10 and 20 pores per inch (ppi) were characterized by performing non-steady-state cooling measurements. Convective gas−solid heat transfer coefficients were determined by applying a one-dimensional, heterogeneous model of the cooling structure. The correlation Nu = 1.2Re0. 43Pr1/3 well described the dependence of th.
Perancangan Sistem Radar FMCW Menggunakan SDR Untuk Mendeteksi Getaran

Radio Detection and Ranging (Radar) adalah sebuah sistem yang bekerja dengan cara memancarkan gelombang elektromagnetik dan mendeteksi sinyal balikan sebuah objek yang mampu memberikan informasi berupa jarak, posisi dan kecepatan dari suatu objek. Berdasarkan sinyal yang dikirim, radar dapat dibagi dua yaitu Radar Pulsa (Pulsed Wave) dan Continuous Wave. Salah satu jenis radar continuous wave adalah radar Frequency Modulated Continous Wave (FMCW). Radar FMCW menggunakan modulasi frekuensi gelombang untuk memungkinkan pengukuran jarak. Resolusi jarak radar FMCW bergantung pada bandwidth. Salah satu perangkat lunak yang dapat mengembangkan teknologi radar adalah Software Defined Radio (SDR). Implementasi SDR berbasis perangkat lunak GNU Radio untuk merancang radar FMCW untuk mendeteksi target yang bergetar. Penggunaan sistem SDR dimana komponen – komponennya diimplementasikan melalui perangkat lunak sebagai pengganti dari hardware yang digunakan sebagai mixer, filter, modulator/demodulator dan sebagainya untuk mengurangi biaya dan kompleksitas dalam desain dan implementasi. Perancangan sistem radar FMCW dibuat dengan bandwidth sebesar 10 MHz dan bekerja dengan frekuensi modulasi 1 kHz. Pada pengujian ini menggunakan delay sebagai rekayasa getaran. Hasil simulasi yang didapatkan dari sistem radar FMCW untuk mendeteksi getaran dapat dibuktikan dengan pergeseran fasa dan frekuensi beat. Pada pergeseran fasa dapat dilihat, dimana pada getaran kecil bergeser sebanyak 0,001 detik dan getaran besar sebesar 0,004 detik. Sedangkan pada pengukuran menggunakan frekuensi beat, pada getaran kecil peak yang dicapai 24 rad/s dan getaran besar 25 rad/s. Kata Kunci :Radar, FMCW, SDR, GNU Radio, Getaran
Classification of Crackle Sound on Lung Using Discrete Wavelet Transform(DWT) and Restricted Boltzmann Machine(RBM)

A crackle sound on lung happen because there’s a anomaly on respiratory tract. Crackle sound like a rattling or clicking that happen to be heard when inhaling or exhaling or both phase of breathing. Ascultate is method that use to evaluate abnormalities inside respiratory tract but this method are still a subjective method. There’s a lot of research that using this problem as its goal with using a different kind of method like using features extraction method, one of those is Discrete Wavelet Transform(DWT). Using Wavelet Transform help to separate the crackle feature from lung sound and using a classification to classify it characteristic. the method is easy to use on wave form of data and it used on this final project. The extracted features classify and tested using Restricted Boltzmann Machine(RBM) which resulting 69% as highest accuracy result.
Fast and Slow Arbitrage: Fund Flows and Mispricing in the Frequency Domain

Using spectral analysis, we document that hedge fund and mutual fund flows explain much of the persistence and cyclicality of anomaly returns. Indeed, they correct and amplify mispricing slowly, 24 and 4 times more, respectively, over horizons longer than one year compared with shorter horizons . Passive fund flows, in contrast, have no effect on mispricing. Over long horizons, hedge fund flows are most influential among fund types on a per-dollar basis . Hedge fund managers, rather than investors, helm this "slow-moving" effect, and frictions explain their behavior. We propose a model highlighting the horizon-dependent effects of capital on market efficiency.