Miracle-dz/UniFAR-FTUs huggingface dataset:
Limitations of the Photoacoustic Technique for Aerosol Absorption Measurement at High Relative Humidity

Laboratory experiments were conducted to assess the suitability of photoacoustic spectroscopy (PAS) for aerosol absorption measurement at high relative humidity (RH). Initial experiments characterized the PAS sensitivity that increased strongly by ∼1.25 between dry conditions and 90% RH. Correction procedures were validated by measuring RH-independent absorption for hydrophobic absorbing particles. Absorption measured by PAS for a range of hygroscopic particles, including different morphologies, hygroscopicities, and absorbing entities, showed strong low biases at high RH (down to 0.4 at 90% RH). The bias was due to water evaporation impacting the PAS signal. Cooling samples to lower absolute humidity while maintaining a constant RH did not significantly reduce the bias magnitude within the temperature range 11–25°C. The magnitude and RH dependence of the bias were not reproduced well using a model of PAS response incorporating coupled heat and mass transfer in the transition regime. This was attributed, in part, to uncertainty related to changes in the water mass accommodation coefficient with RH. Given our inability to correct for evaporation-induced bias effects accurately, or reduce their magnitude experimentally, we conclude that PAS is not a technique well suited to the measurement of absorption at high RH. In order to minimize RH-related errors in PAS measurements made under notionally “dry” conditions, we recommend operation in the RH range 10–30%. Copyright 2013 American Association for Aerosol Research
Influence of Stator Slot and Rotor Pole Number Combination on Field Winding Induced Voltage Ripple in Hybrid Excitation Switched Flux Machine

The induced voltage ripple in DC field windings can cause many problems in hybrid excitation machines (HEMs). It can generate ripple current in field winding, thus causing unsteady magnetic field excitation and hence additional torque ripple and losses. Besides, the torque and power density of hybrid excitation machines may be deteriorated as a result of the influence of the induced voltage ripple on field winding's excitation circuit, particularly under high-speed conditions. Based on a hybrid excitation switched flux machine (HESFM), the influence of stator slot and rotor pole number combination on no-load and on-load field winding induced voltage ripples are studied and compared by the finite element method (FEM). It reveals that the harmonic content and thus the peak-to-peak value of the field winding induced voltage ripple are closely related to the stator slot and rotor pole number combination at both no-load and on-load operating conditions. The FEM calculations are verified by experiments on a prototype HESFM.
A molten-salt route for synthesis of Si and Ge nanoparticles: chemical reduction of oxides by electrons solvated in salt melt

Silicon is one of the major constituents of the earth's crust and, in its elemental form, the base of many semiconductor applications, including electronics and energy conversion. Downsizing Si to the nanoscale dimension extends its application to diverse fields, which, however, is often plagued by expensive and inefficient fabrication methods. We report herein a facile chemical synthetic method for Si nanoparticles from SiO2 in a liquid environment of molten metal chlorides containing magnesium. The results show that Si nanocrystals (NCs) start to grow at 550 °C in the molten salt solvent and that the growth is controllable through the adjustment of the temperature, as well as the type of salt. We also show that the method can be generalized, as illustrated by the synthesis of Ge nanoparticles at a temperature of 450 °C. The growth of NCs is interpreted in terms of the chemical reduction of oxide by electrons solvated in the molten salts.
Prediction of the dielectric strength for c-C4F8 mixtures with CF4, CO2, N2, O2 and air by Boltzmann equation analysis

The dielectric strength of c-C4F8, and mixtures of c-C4F8 with CF4, CO2, N2, O2 and air, is studied through solution of the Boltzmann equation. The reduced ionization coefficient α/N and reduced attachment coefficient η/N are calculated, allowing the reduced effective ionization coefficient (α–η)/N and the critical reduced electric field strength (E/N)cr (the reduced electric field for which (α–η)/N = 0), to be determined. A high value of (E/N)cr for an electronegative gas, such as those considered here, indicates good insulating properties. It is found that c-C4F8–N2 and c-C4F8–air have very similar (E/N)cr values, higher than those of the other three mixtures, and superior even to that of pure SF6 for c-C4F8 concentrations above 80%. Comparison of the results obtained for c-C4F8 and c-C4F8–N2 with experimental values from the literature supports the validity of the approach taken here and the parameters used.
Synthesis and Activity Comparison of Copper-Incorporated MCM-41-Type Sorbents Prepared by One-Pot and Impregnation Procedures for H2S Removal

In the present study, novel copper-incorporated MCM-41-type high-surface-area mesoporous materials were synthesized following a direct hydrothermal synthesis method and also by the impregnation of copper into the mesopores of the pre-synthesized MCM-41 structure. XRD results indicated the formation of a CuO phase within the MCM-41 structure. Sharp H2S breakthrough curves, quite high sorption rate parameters, and high sulfur retention capacities were obtained in high-temperature removal of H2S using these copper-incorporated mesoporous materials. XRD patterns of the sulfided products indicated the formation of a Cu1.81S phase within the MCM-41 structure. A deactivation model gave good predictions of the experimental H2S breakthrough data.
A strategy for improving the functional health and well-being of Cambodian university faculty and staff

The range of outcomes and published record on the Transcendental Meditation technique across 50 years of research in education, business, and government makes its application unique. Its association with health and relation to an individual’s quality-of-life have also made the technique useful in some developing countries. Data related to application of the technique to higher education in Cambodia have been accruing since the early 1990s. The 26-year research program begun by these authors associated with Transcendental Medita-tion and non-verbal intelligence, post-traumatic stress disorder, anxiety, depression, learning, memory, and personality in university students, as well as its collective effects on economic and social indicators and reduc-tions in socio-political violence and crime, makes for an uncommonly rich body of knowledge in a country where empirical research has been rare. Indeed, the early studies in this research program represented among the first published research on higher education since the 1960s, after which Cambodia was plunged into civil war, genocide, and ongoing social turmoil and political conflict until 1993. The present study, which is a modified version of a study previously published in ASEAN Journal of Education, extends this research program to include a preliminary investigation of the practice of Transcenden-tal Meditation by faculty and staff in three regional Cambodian universities and examines its impact on health and well-being. Findings generated by a concurrent, quasi-experimental mixed methods design suggest the practice may be of benefit to university personnel as measured by physical mental and social health, perceived health, self-esteem, anxiety, and depression, among other quality-of-life variables, thereby adding to previous results associated with higher education in this increasingly important south-east Asian nation.
The Influence of Risk Management on Financial Performance and Firm Value: A Case Study on Companies of Crude Petroleum and Natural Gas Production Sector Listed at the IDX 2016 – 2019

This study is explanatory research, the sample in this study is crude petroleum and natural gas production companies listed on the Indonesia Stock Exchange in the period 2016 – 2019. The empirical analysis uses time-series data of Dividend, Earning, ROA, NPM, Tobin’s Q, and Closing Price in those periods. The latent variable in this study is risk management, financial performance, and firm value. The inferential statistical method used to analyze in this study is component-based using Generalized Structured Component Analysis (GSCA). This study finds that a decrease in risk by risk management will not significantly increase financial performance, and an increase in financial performance will not significantly decrease the risk by risk management. A decrease in risk by risk management will significantly increase firm value, and an increase in firm value will significantly decrease the risk by risk management, but the impact of the increase in firm value on risk is bigger than the impact of the decrease in risk on firm value.This study also finds that an increase in financial performance will significantly increase firm value, and an increase in firm value will significantly increase financial performance, but the impact of the increase in firm value on financial performance is bigger. Keywords: Risk, Risk Management, Financial Performance, Firm Value. DOI: 10.7176/EJBM/12-23-14 Publication date: August 31 st 2020
Role of greater occipital nerve block for preventive treatment of chronic migraine: A critical review

Objective: The aim of this study is to critically analyze the evidence of the efficacy and safety of greater occipital nerve (GON) block for the preventive treatment of chronic migraine (CM). Background: A rigorous scientific assessment of efficacy and safety of the GON block for preventive treatment in CM is not available. This critical review was undertaken for this purpose. Methods: References for this review were identified by searches of articles published in the English language in PubMed between 1969 and April 15, 2020 using “greater occipital nerve block,” “chronic migraine,” “migraine,” “headache,” and “treatment” as keywords. Results: Out of potential 532 articles, 9 open-label and 4 placebo-controlled trials that studied the role of GON block for prevention of CM were identified and reviewed. Open-label trials reported a reduction of headache severity and frequency in 35–68% of patients. The beneficial effect of a single block lasted up to 4 weeks. Randomized controlled trials (RCTs) used varied methodology and techniques of GON block and the outcomes were reported at different time points. A single RCT showed a beneficial effect of the GON block at 1 week. However, the GON block was found to be safe and well tolerated. Conclusion: Long-term efficacy of GON block in CM shall need further well-designed RCTs using standardized methodology. This study, in addition, reviewed the limitations and uncertainties regarding the technique and methods of use of GON block in CM.
Study on the Application and Colour Fastness Properties of Aqueous Dye Extract from Whitfieldia Lateritia Leaves

The application and colour fastness properties of aqueous dye extract from Whitfieldia lateritia leaves were studied. The UV-Vis and FT-IR spectra of the dye extracts showed the presence of polyphenols such as flavonoids and tannins. The extract was used to dye cotton fabrics using different mordants viz- alum/tannic acid, ferrous sulphate and potassium dichromate. Pre-mordanting, simultaneous mordanting and post-mordanting methods were also used to dye the cotton fabrics in the presence of sodium chloride as an electrolyte. The cotton fabrics showed a total or slight change in colours with different mordants and mordanting methods. The dyed fabrics were evaluated for Colour fastness to Washing, perspiration and light. The general assessment of the colour fastness tests showed that the aqueous extract of Whitfieldia lat-eritia dye applied under the influence of mordants irrespective of the method of application used showed good ratings.
Differential response of anti oxidant system during grain development in drought tolerant and drought sensitive varieties of wheat (Triticum aestivum L.)

The present study showed the effect of drought stress on antioxidant enzymes in leaves and developing grains of two wheat varieties viz. WH 1105 and WH 1025. The results showed that during grain development, activities of antioxidant enzymes viz. Superoxide Dismutase (SOD), Catalase (CAT), Peroxidase (POX), Ascorbate Peroxidase (APX) and Glutathione Reductase (GR) increased more in WH 1025 under drought stress than drought susceptible wheat WH 1105. The increased antioxidant enzyme activities under drought stressed wheat variety WH 1025 in leaf and grain samples during development were due to efficient functioning of the system to cope with drought conditions and made the crop plant tolerant.
Stress Components and Shear Thickening of Concentrated Hard Sphere Suspensions

The elastic-like and viscous-like viscosity components of model, Brownian hard sphere suspensions were determined. The elastic-like component, sometimes called the thermodynamic component, is due to Brownian motion while the viscous-like component, sometimes called the hydrodynamic component, is due to hydrodynamic interaction between and drag on the particles. The three volume fractions tested were found to be above the glass transition volume fraction due to the absence of a zero shear viscosity. The hydrodynamic viscosity component was approximately independent of shear rate, yet the suspension demonstrated a large amount of shear thinning which was due to the elastic-like component. The measured stress components associated with shear thickening were distinctly different in each sample. Continuous shear thickening was measured for the sample with 0.54 volume fraction while the samples with volume fractions 0.59 and 0.63 showed discontinuous shear thickening. Shear thickening in these concentrated susp.
The dialectical method as a way of delivering bad news

Delivering bad news (DBN) to a patient is an enormous challenge and a great mental burden for a doctor. Medical staff members often do not have sufficient skills in this field, or they develop their own techniques. At the same time, proper delivery of information minimises fear in patients and increases their therapeutic engagement and affects treatment results. Although they include protocols that are considered standard in difficult situations, their applicability is usually limited to the particular cultural model in which they were created. Is there any chance to find a relatively culturally stable method of DBN? It seems to be a particularly significant question if we realise the growing rate of social migrations that take place as a part of the globalisation processes. For this reason, we would like to perform and to emphasise the role of the dialectical model of delivering bad news. This method is based on both narrative psychology and the maieutic method, which gradually directs the patient’s awareness of the physical condition he or she is in. For a person who arrives at the truth this way, it is less overwhelming and less hurtful. Through this, our as-sumptions on the dialectical model of DBN may contribute to improving the quality of medical services and patient satisfaction.
Servant Leadership: A New Model of Service at University?

The purpose of this study is to relate servant leaders' attributes in university. As construction of leadership behavior that is multidimensional and unique compared to other leadership models, servant leadership emphasizes personal integrity in providing services to members of the organization and other stakeholders. Universities as higher education institutions are expected to adapt to the needs and demands of the environment by applying leadership style that gives more attention to the transformative progress of organization members. Given the complex environment and its social responsibility, leaders in the university must actively listen to its stakeholders to pursue organizational changes that fit with the need of wider publics while uploading high-quality academic outcomes and maintaining institutional values. This study focuses on the implementation of servant leadership at Tadulako University from seven dimensions of servant leadership through questionnaires distributed to 47 respondents. The results of this study indicate that leaders at various levels in Tadulako University have practiced servant leadership attributes moderately. At some points, leaders exhibit servant leadership behavior that shows their awareness of 'creating value for the community' and 'empowering' while still working on 'put subordinates first'.
Energy Efficiency Maximization via Joint Active and Passive Beamforming Design for Multiuser MISO IRS-Aided SWIPT

This letter studies a multiuser multiple-input single-output (MISO) intelligent reflecting surface (IRS)-aided simultaneous wireless information and power transfer (SWIPT) system. Specifically, a multi-antenna base station (BS) transmits data along with energy to a set of users to decode data and harvest energy by adopting the power splitting (PS) simultaneously. The energy efficiency indicator (EEI) is introduced to trade off between data rate and harvested energy, which is maximized by jointly optimizing beamforming vectors at the BS, PS ratio at each user, and phase shifts at the IRS. To solve this non-convex optimization problem, we first adopt the majorization-minimization (MM) approach to construct a concave-convex fractional function which can be handled via the Dinkelbach algorithm and then propose an efficient algorithm for solving two subproblems based on the alternating optimization (AO). For the first subproblem, semi-definite relaxation (SDR), MM approach, and Dinkelbach algorithm are adopted, while for the second sub-problem, a new manifold approach is proposed to handle the unit-modulus constraints due to IRS passive reflection. Simulation results demonstrate the superior performance of our proposed algorithm compared to other baseline schemes.
Impact of Board Characteristics and State Ownership on Dividend Policy in Vietnam

The relationship between board characteristics and state ownership on dividend policy has been carefully examined in the literature in developed and emerging markets. This paper would seem to be the first to analyse the impacts of board gender diversity and state ownership in the Vietnam market for the following: (1) the number of female directors on the boards of directors is about 25%, which is the highest among South-East Asian countries; and (2) Vietnam has not fully transformed into a market economy, so the state ownership in the listed firm is apparent. Therefore, it is worth trying to examine the impacts of board gender diversity and state ownership on dividend policy in Vietnam. This paper illustrates that the female CEO and female CEO duality decrease the dividend ratio, while chairwomen tend to use dividend ratio as a tool to manage the company. Moreover, Boards of Directors (BODs) with more than three female members usually decrease the dividend payout ratio. The empirical findings are consistent with agency theory, as managers increase payouts to reduce free cash flow and agency costs in firms. The results also indicate that there is an inverse relationship between state ownership and the dividend payout ratio. It is due to higher state ownership allows firms to access external debts easily, so these firms pay high dividends to reduce agency costs. Moreover, governments perceive dividends from holding capital in listed firms as a source of revenue for the state budget. Therefore, firms with higher state ownership are more likely to increase dividend payouts.
Europe’s Dangerous “CRISPer” Volcano Ride

Mutations are essential for evolution and high biodiversity. Natural mutations occur spontaneously and are non-targeted. They have thus been very important for plant breeding since humans started domestication many thousand years ago. New genetic technologies such as genome editing with site-directed nucleases, e.g., CRISPR/Cas9 (“CRISPer”), allow mutations to be induced in a very fast and highly targeted manner. Genome editing will, therefore, drastically accelerate the traditional breeding process of already available crop plants, but also will produce new crop varieties. Genome editing is, similar to genetic engineering technology, a topic of high public controversy in terms of biosafety concerns. Although public debates to ensure the environmental safety of plants and animals derived from newly developed technologies are very important, such debates can also delay or even impede the practical use of novel innovative technologies. Europe must, in the next few years, make key decisions about the fate of such technologies, like genome editing. It is time to address the danger that the approval process of these technologies is getting tangled-up in the huge European bureaucratic net. CRISPR/Cas9 and other genome editing technologies could experience the same fate as genetic engineering, which has been the focus of endless public debates for at least 30 years. At the moment, the entire situation is like a ride on the rim of a volcano.
RELAÇÃO ENTRE SAÚDE EMOCIONAL E QUALIDADE DE VIDA NO TRABALHO DE PROFESSORES UNIVERSITÁRIOS: REVISÃO DA LITERATURA / RELATIONSHIP BETWEEN EMOTIONAL HEALTH AND QUALITY OF LIFE AT WORK OF PROFESSORS: LITERATURE REVIEW

Teaching is a profession that faces daily challenges inherent to the search for excellence in the act of experiencing, transmitting and seeking knowledge, in addition to facing challenges pertinent to the various interpersonal relationships that the profession requires. Therefore, this profession presents a higher degree of vulnerability for the onset of mental disorders, with possible consequences in all spheres, including relations with students and with the organization itself. Thus, a bibliographic review was developed on the mental health issue of university professors, highlighting anxiety disorders, depression and stress, and their relationship with the Quality of Life ISSN 2525-8761 at Work of these professionals. The goal is to understand the problem and outline intervention perspectives that can mitigate the consequences of this difficulty in the context of managing Brazilian universities.
Investigating the Work and Life of Percy Ludgate

Percy Edwin Ludgate (1883–1922) is notable as the second person to publish a design for an Analytical Machine, the first after Babbage's “Analytical Engine. ” We outline the initial results of the first new investigation into the work and life of Percy Ludgate since Randell's papers of nearly 50 years ago and nearly 100 years after Ludgate's death. First, we examine the principles of his machine and how it was constructed and worked. Second, we outline his life. We present a range of new material, including two significant discoveries, one concerning Ludgate's machine and the other his family.