bluuebunny/crossref_metadata_2025 huggingface dataset:
In Silico Evaluation of Aromatase Inhibitory Anti-benign Prostatic Hyperplasia Potentials of Spirostan Sapogenins
Authors:   Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Lagos, Nigeria, Ajala Olusegun Samson , Akinleye Moshood Olusola ,   Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Lagos, Nigeria, Owolabi Mbang ,   Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Lagos, Nigeria, Ukpo Grace ,   Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Lagos, Nigeria
Published: May 2023

Inherent oestrogen receptor alpha (ERα) and other nuclear receptor signaling activities of typical aromatase inhibitors (AIs) preclude their clinical use as anti-oestrogenic anti-benign prostatic hyperplasia (anti-BPH) agents. Spirostan sapogenins (SS) constitute a chemical space from which AIs without such deterrents could be sought. This work was aimed at in silico discovery of clinical aromatase inhibitory anti-oestrogenic anti-BPH drug leads. Fortysix SS were docked against an inhibitor conformation of the human placenta aromatase. Nuclear receptor signaling activation tendencies of seven of them showing high docking scores comparable to that of the co-crystalised ligand, exemestane, were determined in a ligand-based webserver screening (Protox-II) and docking against an agonist conformation of the ERα ligand binding domain (ERαLBD). Other toxicity and pharmacokinetic/druglikeness evaluations were caried out using Protox-II and SwissADME webservers. Stability of aromatase complex with the highest-docking-score SS was explored in a molecular dynamics simulation using Webgro molecular dynamics webserver at a 20 ns simulation time. None of the seven SS activated the nuclear receptor signaling pathways; pharmacokinetic/druglikeness predictors showed that they would be orally bioavailable; they were not susceptible to drug metabolising cytochrome P450 (CYP) isozymes and two of them demonstrated non-susceptibility to the efflux transport activity of P-glycoprotein (Pgp). Molecular dynamics data analysis revealed the root mean square deviation (RMSD) of 2 Å–3 Å and a radius of gyration of and 22 Å over the 20 ns simulation time. This investigation provides a molecular framework for anti-oestrogenic anti-BPH therapeutic strategy via aromatase inhibition (AI) and unmasks seven SS as potential anti-BPH AIs.
A Nationwide Survey on Malaysian Hospital Physicians’ Practices of Intravenous Potassium Chloride Supplementation and Opinions on Premixed Formulation in the Treatment of Hypokalaemia
Authors:   Discipline of Clinical Pharmacy, School of Pharmaceutical Sciences, Universiti Sains Malaysia, Pulau Pinang, Malaysia, Chong Chee Ping , Mohammad Hirman Melissa ,   Discipline of Clinical Pharmacy, School of Pharmaceutical Sciences, Universiti Sains Malaysia, Pulau Pinang, Malaysia,   Normah Medical Specialist Centre, Jalan Tun Abdul Rahman Yaakub, Petra Jaya, Kuching, Sarawak, Malaysia
Published: May 2023

This study aims to evaluate the Malaysian hospital physicians’ practices of intravenous potassium chloride in the treatment of hypokalaemia and their opinions on using premixed formulation. This was a nationwide online survey using a self-administered questionnaire. The survey link was sent to the practising hospital physicians in Malaysia through email (n = 1,455), Facebook Messenger (n = 2,734) and posted on Facebook as well. A total of 207 responses were received. The physicians were mostly males (63.8%), aged between 30 years old–39 years old (51.2%) and worked in the government sectors (76.8%). The most preferred dosage of potassium chloride for mild, moderate and severe hypokalaemia was 10 mmol (44.4%), 20 mmol (55.1%) and 30 mmol (37.7%), respectively. The mostly chosen infusion rate of potassium chloride for mild hypokalaemia was over 24 h (41.1%) while for both moderate and severe hypokalaemia were over 1 h–2 h (63.8% and 89.9%, respectively). The concentration of intravenous potassium chloride is the main factor (68.1%) which would influence the infusion route choice. Serum potassium monitoring of every 24 h was chosen by 52.7% of the respondents for mild hypokalaemia while every 1 h–2 h was mostly chosen for moderate and severe hypokalaemia (49.3% and 87.4%, respectively). Cardiac monitoring was mostly opted in severe hypokalaemic patients (70.0%). Majority of physicians agreed that a premixed formulation is easier to administer (64.7%) and safer for the patients (51.7%). In conclusion, there were variations in the prescribing practices among Malaysian physicians to treat hypokalaemia. Most physicians were in favour of premixed formulation.
Public Health Activities: Evaluation of Community Pharmacists’ Attitude, Practice and Barriers in a Nigerian Southwestern State
Authors:   Department of Clinical Pharmacy and Pharmacy Administration, Faculty of Pharmacy, University of Ibadan, Nigeria, Akande-Sholabi Wuraola , Akinbitan Akinlolu A. ,   Department of Clinical Pharmacy and Pharmacy Administration, Faculty of Pharmacy, University of Ibadan, Nigeria, Adebisi Yusuff A. ,   Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom
Published: May 2023

The Nigerian health system continues to face double burden of communicable and noncommunicable diseases. To meet the country’s health needs, the number of healthcare professionals participating in public health activities must be increased. The purpose of this study was to assess the attitudes, practices and barriers to rendering public health services among community pharmacists in a southwestern Nigerian state. We used a pretested self-administered questionnaire to collect data on 120 community pharmacists’ sociodemographic characteristics, practices, attitudes and barriers to providing public health services. Participating pharmacists must have at least one year of experience working in a community pharmacy. Data were summarised descriptively using IBM SPSS (version 23.0). Females’ respondents were (n = 69, 57.5%) and (n = 82, 68.3%) pharmacists had 1 year– 5 years’ experience. Most (n = 116, 96.7%) of the respondents agreed that pharmacists should be involved in public health activities, and (n = 106, 88.3%) respondents disagreed that public health activities should be carried out only by doctors and nurses. Overall (n = 89, 74.0%) of the respondents had positive attitude to public health activities (score ≥ 80%) and majority of the community pharmacists had been practicing public health activities. Insufficient time (n = 65, 54.2%) and lack of financial capital to implement changes (n = 84, 70.0%) were identified as prominent barriers that hindered community pharmacists from rendering public health services. Community pharmacists had positive attitude towards the practice of public health activities. However, further studies should emphasise on how to overcome barriers preventing their involvement in public health activities. Providing incentives for public health services rendered could increase community pharmacists’ involvement in public health activities.
Decays of a bino-like particle in the low-mass regime
Authors: Domingo Florian , Dreiner Herbert
Published: May 2023

We study the phenomenology associated with a light bino-like
neutralino with mass \lsim m_{\tau}≲mτ
in the context of the R-parity violating Minimal Supersymmetric Standard
Model. This is a well-motivated example of scenarios producing
potentially light and long-lived exotic particles, which might be
testable in far-detector experiments, such as the FASER experiment at
the Large Hadron Collider. A quantitative assessment of the discovery
potential or the extraction of limits run through a detailed
understanding of the interactions of the light exotic fermion with
Standard Model matter, in particular, the hadronic sector. Here, we
propose a systematic analysis of the decays of such a particle and
proceed to a model-independent derivation of the low-energy effects, so
that this formalism may be transposed to other UV-completions or even
stand as an independent effective field theory. We then stress the
diversity of the possible phenomenology and more specifically discuss
the features associated with the R-parity violating supersymmetric
framework, for example neutron-antineutron oscillations.
Psychosocial Correlates of Women with Breast Cancer during Chemotherapy: A Scoping Review
Authors: Santos Ana Sofia , Silva Isabel
Published: May 2023

Introduction. Treatments for breast cancer (BC) cause changes in the lives of these women and their psychological state and quality of life (QoL) can be affected at several levels. Objective. To synthesize the current knowledge about how QoL, social support (SS), resilient coping, spirituality, and positive and negative affect (PANA) behave during the experience of BC and chemotherapy (CT). Methodology. For this scoping review, the PRISMA ScR guidelines were followed, it was used B-On, and studies between 2016 and 2021 were discriminated. 120 articles were obtained, and 14 cross-sectional and retrospective studies were included for review, since the others did not assess at least one of the variables of interest, as they were literature reviews, included metastatic or advanced cancer, and had as participants the significant others of women with BC. Results. BC and CT have a significant positive impact on SS, spirituality and resilience and a significant negative impact on QoL and PANA. Spirituality and SS showed to be important coping strategies usedby women with BC. There seems to be a positive correlation between most variables, except for negative affect. Discussion/Conclusions. These psychosocial variablesthat seem to be affected by cancer and its treatments should be considered by the health team. Psychological interventions that focus on the needs and resourcesof these women should be developed, namely group interventions and Positive Psychology-based interventions.
Formes actuelles du devenir communiste
Authors: Badiou Alain
Published: May 2023

Il est indubitable aujourd’hui que le mot « communisme » est un mot frappé par un verdict très majoritairement négatif, au point qu’il lui arrive d’être quasiment unanime. Il ne se rencontre plus, ce mot, que pour décrire les avatars de l’irrésistible déclin des partis communistes en Europe occidentale, singulièrement en Italie, en France, en Espagne ou au Portugal. Pour observer son quasi total rejet dans l’espace des conquêtes ou reconquêtes de la Russie soviétique à la fin de la dernière guerre mondiale : De la Pologne à l’Allemagne de l’Est ou de la Hongrie à la récente Ukraine, de la Bulgarie aux Etats baltes, on est en train de jeter aux oubliettes la séquence communiste des lendemains de la Deuxième Guerre mondiale. En Russie, le mot « communisme » ne désigne pratiquement plus que des résidus étatiques ou patriotiques. Et en Chine même, où le mot « communiste » reste accolé au Parti unique dominant, il n’est plus guère utilisé. On dit « le Parti » un peu comme on dit « l’Etat ». Quand Xi Jinping déclare avec solennité que, je le cite, « le Parti décide de tout », il se dispense d’utiliser l’adjectif « communiste », et ce, bien que les dirigeants chinois n’aient jamais publiquement effacé cet adjectif.
Effect of CSR activities on customers’ purchase intention: The mediating role of trust
Authors: Ali Imran , Naushad Mohammad , Jaafar Alasmri Hadeel
Published: May 2023

Corporate social responsibility (CSR) is the belief that businesses must consider ethical, social, and environmental issues when making decisions. Several studies have found that CSR improves corporate performance. Moreover, CSR is thought to increase consumer trust and purchase intention. This study investigates the effect of CSR activities on customers’ purchase intentions and the mediating role of trust. It draws linkages and establishes that businesses can improve their bottom lines while positively affecting society by acting responsibly.The present study selected two independent variables (ethical corporate social responsibility and legal corporate social responsibility) alongside one dependent variable (purchase intention) and one intervening variable (trust). The sample comprises two hundred and thirty respondents from India’s National Capital Region (NCR), Delhi, and nearby regions. The data were examined using structural equation modeling (SEM). The results showed that CSR activities significantly positively affected customers’ purchase intention. Furthermore, trust mediated the linkages between CSR activities and customers’ purchase intention. The findings suggest that CSR activities can increase customers’ purchase intention by fostering trust. In other words, when customers trust a firm, they are more likely to intend to purchase its products or services. CSR managers should therefore focus on creating and maintaining trust with their customers. In addition, findings suggest that firms should be conscious of their social image. This study offers significant insights because they show that any business can be successful and socially responsible.
Acknowledgment This study is supported via funding from Prince Sattam bin Abdulaziz University project number (PSAU/2023/R/1444).
Textural and antioxidant properties of mozzarella cheese fortified with dehydrated oyster mushroom flour
Authors: Rahman Md. Atiqur , Roy Joysree , Mahomud Md. Sultan
Published: May 2023

As a good source of natural anti-oxidants, oyster mushroom flour can be incorporated in dairy products. However, very few scientific publications provide formulations for dairy products fortified with oyster mushroom flour. This research featured the physicochemical and antioxidant properties of oyster mushroom flour pretreated with 0.5% citric acid solution. Three samples of mozzarella cheese were incorporated with 1, 2, and 3% oyster mushroom flour and tested for physicochemical properties, total phenolic content, total flavonoid content, and 2, 2-diphenyl-1-picrylhydrazyl (DPPH). The mushroom flour had 11.09 ± 0.88% moisture content, 20.70 ± 0.74% protein, 3.25 ± 0.13% ash, 7.43 ± 0.35% crude fiber, 3.31 ± 0.51% fat, and 54.20 ± 0.81% carbohydrate. The DPPH was 87.00 ± 0.15 mg GAE/g DM, the total phenolic content was 2.09 ± 0.68 mg GAE/g DM, and the total flavonoid content was 1.67 ± 0.27 mg QE/g DM. The texture and water holding capacity of the mozzarella cheese samples fortified with oyster mushroom flour decreased as the proportion of mushroom flour increased. The color (L* lightness, b* redness, and a* yellowness) was significantly lower than in the control (cheese without oyster mushroom flour). The test samples contained significantly (p ≤ 0.05) higher amount of DPPH and phenolic compounds than the control. The sensory attributes were assessed by 30 semi-trained panelists, who gave the highest score to the sample fortified with 1% oyster mushroom flour. As a natural antioxidant, oyster mushroom flour proved to be an excellent component for functional cheese products.
GO FURTHER AND BEYOND: PERSONIFICATION AND INDIVIDUALISATION IN LEARNING AND TEACHING MASTER’S STUDENTS
Authors: Bugreeva Elena A. ,   St. Petersburg State University
Published: May 2023

Personification and individualization in learning and teaching master’s students aims to mold high-level specialists able to integrate successfully to the international professional community. The article discusses a synergy of approaches such as system and matrix modelling of professional activity, learner-centered teaching techniques, adaptive learning, learning trajectories, event techniques, and formative assessment. These include the potential of an entrepreneur master’s programme leading to a startup. The researcher uses methods such are observation, case study, experiment, and instructional modelling. The study is based on the current Journalism, Advertisement, and PR master’s programmes at Saint Petersburg State University and a new one — Foreign Languages and Translation in the Media. The ultimate goal of this new approach is to enhance students’ awareness of taking a master’s programme as part of their successful careers. Further research will include developing qualitative and quantitative measurement tools to monitor student’s progress.
THE ONOMASTIC VOCABULARY AS THE CULTURAL LACUNARITY MARKER
Authors: Glukhova Olga V. ,   Rostov State University of Economics
Published: May 2023

Onomastic vocabulary, as a linguistic research object, has for a long time been on the periphery and received insufficient researchers’ attention. The anthropocentric approach to the surrounding reality phenomena investigation enables this section of the vocabulary to be studied from the language and culture relationship point of view. Onomastic vocabulary in this case appears to be a translator of cultural information, a carrier of people national-specific features and ethnic identity. The linguocultural study of onomastic vocabulary as a cultural lacunarity marker seems to be relevant and widens research opportunities for proper names translating and contrasting studies. Thus, the onomastic vocabulary is subjectively studied via culturally-specific semantic features. The paper aims at investigating the onomastic vocabulary as a cultural lacunarity marker. Research objectives are to consider the concept of onomastic vocabulary and of cultural lacunarity; to analyze the onomastic vocabulary cultural specifics; to investigate the culture specific onomastic vocabulary in «The Master and Margarita» by M. Bulgakov. The paper exploits the contrasting analysis method to identify and characterize the onymyc lacunae on the material of «The Master and Margarita» by M. Bulgakov translated into English. The culture-specific information of a proper name can be extracted by means of complete linguo-cognitive analysis of a whole concept constituents’ inventory that is a profound study of notion, value, image, association and interpretational aspect in terms of comprehension and translation. This type of analysis appears to be crucial for onomastic vocabulary translating in fiction. The onomastic vocabulary by Bulgakov refers to the semantic motivation type and appear to be «undeciphered» (by translators) lacunas in the novel’s translations. The study proves the idea of onomastic vocabulary being a cultural lacunarity marker.
Exemption from criminal liability with the appointment of a court fine: The analysis of judicial practice
Authors: Kirillova Yana M. ,   St. Petersburg State University
Published: May 2023

The refusal of criminal prosecution with the imposition of a court fine is a new way of resolving a criminal-legal conflict for the domestic science of criminal law and criminal legislation. The uniqueness of this ground is that this is the only “conditional” exemption from criminal liability in the system of general grounds: in case of non-payment of a court fine within the time limit set by the court, the court fine is canceled, and the person is brought to criminal responsibility under the corresponding article of the Special Part of the Criminal Code of the Russian Federation. The article analyzes the judicial practice of applying Art. 76.2 of the Criminal Code of the Russian Federation for 2017–2021, judicial statistics, monographs and dissertations devoted to the institute of exemption from criminal liability, as well as scientific articles and dissertations related to the subject of this study. As a result of the research, the author identified two main problems of applying Art. 76.2 of the Criminal Code of the Russian Federation: competition between Art. 76 and Art. 76.2 of the Criminal Code of the Russian Federation and the choice of judges in favor of Art. 76.2 in cases where there are signs of reconciliation with the victim; the problem of compensation for damage (making amends for harm). The article suggests mechanisms for solving problems: a theoretical model of Art. 76.2 is proposed.
Bills of exchange in a letter of credit
Authors: Zhongmin Zha ,   China University of Political Science and Law
Published: May 2023

Application of bills of exchange in documentary credits (letters of credit, LC) has been confronting with many disputes given different opinions and interpretations of bills of exchange ordinance under various legal jurisdictions, which has resulted in a controversy to abolish bills of exchange in LC transactions. To combinate functions and legal aspects of bills of exchange into the practice of documentary credits, this article emphasizes the importance of bills of exchange in LC practice, articulates the functions of bills of exchange in the procedure of LC business from the perspectives of qualified payment prompter as well as the verification of payment amount and the determination of maturity date & payee, and concludes that bills of exchange plays a critical settlement role by means of prompt payment in documentary credits. As suggested by the Opinions of International Chamber of Commerce (ICC) Banking Committee and the practice of blank bills of exchange this article explains further the right to examine the bills of exchange and to dishonor discrepant bills of exchange by an issuing bank or a confirming bank or a nominated bank, however, the beneficiary has the right to correct or alter discrepant bills of exchange due to the payment undertaking by the issuing bank or the confirming bank. Since bills of exchange is a financial instrument instead of a commercial document, this correction or alteration by the beneficiary to the bills of exchange should not be subject to the limitations by presentation period and expiry date stipulated by the terms and conditions in the documentary credits. This essay suggests conclusively that the Paragraph B14 for amounts and Paragraph B16 for correction and alteration in ISBP745 should be revised to provide consistent examination standards to solve the problems of conflicting opinions of the bills of exchange under various jurisdictions.
The Effectiveness of and Students’ Perceptions of Peer Feedback: A Vietnam Action Research Project
Authors: Le Phan Thi Ngoc ,   VNU University of Languages and International Studies, Vietnam National University, Hanoi, Vietnam
Published: May 2023

The utilization of peer feedback is an established and growing global trend. However, it has been less employed and explored in the Vietnamese context. Therefore, this action research study explored the effectiveness of peer feedback on students’ writing and perceptions of the advantages and disadvantages of this approach. In the first phase, a pre-test and post-test design was employed to explore how student performance changed after receiving peer feedback. After that, questionnaires and interviews were conducted to explore this phenomenon further. The results showed that the experimental group outperformed the control group, and students had positive perceptions toward peer feedback concerning learning strategies, attitudes, motivation, and self-esteem. Reported disadvantages included students’ lack of writing and assessment knowledge. The results can potentially inform scholars and teachers interested in implementing peer feedback in the Vietnamese context.
Fluid pressure dynamics in a hydraulic fracture during transient-well-operation mode
Authors:   Mavlyutov Institute of Mechanics of UFRC RAS, Ufa, Russia, Shagapov V.Sh. , Bashmakov R.A. , Fokeeva N.O. , Shammatova A.A. ,   Ufa University of Science and Technology, Ufa, Russia,   RN-BashNIPIneft, Ufa, Russia,   Ufa State Petroleum Technological University, Ufa, Russia
Published: May 2023

Hydraulic fracturing is one of the most effective methods for intensifying hydrocarbon production. The paper describes the transient-well-operation modes of the well, establishes a connection between the changing fluid flow in the well and the pressure in the fracture and reservoir. With this purpose, a solution is found to the integro- differential equation that describes the change in pressure in the hydraulic fracture with a known change in pressure in the well or at a given flow rate. Based on the bottomhole pressure change data for a short-term pump operation that maintains a constant flow rate and subsequent pump shutdown (Π-shaped flow rate change), it is convenient to determine the characteristics of a hydraulic fracture using the formulae proposed in the paper. The results of the work can be used in hydrodynamic studies of wells. The article shows the application of the obtained equations for determining bottomhole pressure when solving a practical problem with field data, and also presents a formula that allows calculating its conductivity without taking into account the permeability and width of the hydraulic fracture.
Collapsing motions of a diatomic gas whose density depends only on time
Authors:   Ufa University of Science and Technology, Ufa, Russia, Gumerov I.I. , Katashova A.A. , Yulmukhametova Y.V. ,   Mavlyutov Institute of Mechanics UFRC RAS, Ufa, Russia
Published: May 2023

One submodel of gas motion with a linear velocity field is considered in the paper. Namely, a submodel that defines the movements of a polytropic gas with a density that depends only on time. A polytropic gas is a gas for which the internal energy is a function linear in temperature. The submodel under consideration is given by a system of ordinary differential equations of the 22nd order for unknown functions. These functions characterize the movements of gas particles and determine the type of density, pressure and entropy functions. The exact solution is sought for a special case, namely for a diagonal linearity matrix. Two new exact solutions have been found. The type of vector functions of velocity, density and pressure are determined. By the form of the velocity function, the world lines of motion of gas particles are recorded. In the three-dimensional space of coordinates x, y, z, the trajectories of gas particles for various initial data are constructed. A qualitative analysis of the movement was carried out. The Jacobi matrix is constructed. The moments of collapse of gas particles are determined by the value of the Jacobian. Both solutions have collapse: collapse on a straight line and collapse at a point.
Stress-strain state of an underwater offshore oil pipeline taking into account changes in ground conditions and operating parameters
Authors:   Mavlyutov Institute of Mechanics of UFRC RAS, Ufa, Russia, Zaripov R.M. , Masalimov R.B. ,   Ufa State Petroleum Technological University, Ufa, Russia
Published: May 2023

The article briefly describes the construction of concreted pipes used in recent years in the construction of offshore gas and oil pipelines. In the formulation of the problem of the stress-strain state of an underwater offshore oil pipeline, the calculated section is conditionally divided into three parts: the middle blurred bare part and the underground parts adjacent to it on the left and right. A brief description of the solution of the problem is given. The results of calculations of the main characteristics of the stress-strain state of the underwater section of the offshore oil pipeline are presented in the form of a diagram of the pipeline deflection and bending stresses, as well as in tables through extreme values of deflection and bending stresses from span and support bending moments for various values of operating parameters and soil conditions in adjacent underground parts. By analyzing the stress- strain state of the calculated section of the offshore oil pipeline, the critical values of the operation parameters and the corresponding critical values of the equivalent longitudinal axial force were determined.
Study of pressure wave dynamics in a channel with a spherical bubble cluster
Authors:   Ufa University of Science and Technology, Ufa, Russia, Fattakhov S.R.
Published: May 2023

The features of wave propagation in a bubbly liquid are associated with the combined interaction of nonlinear, dispersive, and dissipative effects. In a liquid with bubbles, the properties of a practically incompressible liquid, which is a carrier phase, change dramatically with a small volume (and even more so, mass) addition of gas (bubbles), which is a dispersed phase. The peculiarity of bubbly liquids is due to their high static compressibility while maintaining a high density close to that of the liquid, which in turn leads to a low equilibrium speed of sound. In this paper, we study two-dimensional axisymmetric wave perturbations in a channel with water containing a spherical cluster filled with a water-air bubble mixture and located at one of the end boundaries. Based on the results of numerical calculations, the dependence of the maximum pressure amplitude formed in the channel on the geometrical parameters of the cluster is analyzed. It has been established that the presence of a near-end bubble cluster can significantly both increase and decrease the effect of the wave signal incident on the wall, depending on the size of the cluster and its characteristics.
Acoustic stability of a superheated liquid with vapor–gas bubbles
Authors:   Ufa University of Science and Technology, Ufa, Russia, Safiullin A.R.
Published: May 2023

It is known that the physicochemical properties of liquids in a metastable state are mainly determined by the presence of various inclusions in their composition, for example, gas bubbles or solid particles, and it has been established that, under mechanical and thermal equilibrium, the state of a liquid with gas bubbles distributed over the volume due to the action of capillary forces at the interface, always overheated. In this paper, we consider the propagation of weak perturbations in a superheated water-air bubbly medium, when, in addition to water vapor, the bubbles contain an inert gas (for example, air) that does not participate in phase transitions. To describe the problems under consideration, a system of equations is used, which consists of the laws of conservation of mass, the number of bubbles, momentum equations, the Rayleigh–Lamb equation, the equation of heat conduction and diffusion. The solution is sought in the form of a damped traveling wave. Based on the solution of the dispersion equation, maps of the stability zones of the systems under consideration were constructed depending on the magnitude of the liquid overheating on the plane ”volume content — bubble radius“.
Performance of Vetiver Oil Extraction by Ultrasonication and Soxhletation Methods
Authors:   Departemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Padjadjaran, Haryono Haryono , Ernawati E. Evy ,   Departemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Padjadjaran, Erliana Adella Hayu ,   Departemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Padjadjaran
Published: May 2023

This study aims to extract vetiver oil by alternative extraction methods, namely ultrasonic extraction and soxhlet extraction. The performance of both extraction methods is compared based on the effect of extraction operation conditions with yield and quality parameters of vetiver oil produced. The quality of vetiver oil was determined and compared with SNI 06- 2386-2006. The specified quality parameters are color, odor, density, refractive index, and solubility in 95% ethanol. The composition of compounds in vetiver oil was identified by GC-MS method (Gas Chromatography-Mass Spectrometry). The results showed that ultrasonic extraction performed more effectively than soxhlet extraction. The ultrasonic extraction and soxhlet extraction gave an oil yield of 3.98±0.58% and 3.95±0.81%. In the extraction with ultrasonic aid performed in extraction time about 3/10 times shorter and solvent consumption about 2/3 times less compared with soxhlet extraction. In terms of quality, vetiver oil from ultrasonic extraction has eligible with the quality standard according to SNI 06-2386-2006 based on the test parameter. The GC-MS showed that vetiver oil from ultrasonic extraction composed of the mayor compounds of khusenic acid (36.40%), zierone (13.89%), nootkatone (1.92%), γ-selinene (1.57%), α-vetivone (1.43%), isolongifolene (1.32%), δ-cadinene (0.86%), and khusimene (0.64%).
Energy Requirement Evaluation of Spray Distillation Technology as Green Alternative of Bioethanol Downstream Processing
Authors: Kartawiria Irvan ,   Chemical Engineering Department, Faculty of Life Sciences and Technology, Swiss German University, Tangerang, Indonesia
Published: May 2023

Bioethanol downstream processing is consuming 40-60% of total energy requirement in production of bioethanol as fuel, with highest consumption being the evaporation and distillation process. One of the technologies currently in development stage is spray distillation. In spray distillation, ethanol-water mixture feed is dispersed as micro droplets into a heated column at 40oC, while counter current air is flown upward to collect the vapor and discharged into condensation column. Since the spray distillation principles has been tested in controlled laboratory scale, this research objective is to evaluate the energy requirement for such process and comparison to conventional distillation. Testing was conducted on 20 L batch stainless steel column distillation and spray distillation of the same capacity. The ethanol concentration in feed was set to 15%-v to simulate fermentation broth, and operating parameters were sets to obtain 80%-v product. Batch distillation was heated using LPG gas and calculation shows that heat requirement 3.34 MJ/L pure ethanol equivalent. Alternatively, spray distillation running with feed rate of 5.05 ml/s at 40oC only requires 2.2-2.6 MJ/L pure ethanol equivalent. The study shows potential of spray distillation technology in reducing the energy requirement in downstream processing of bioethanol to 62-79% of conventional distillation.
Potential of Empty Fruit Bunches (EFB) Waste as Bioenergy to Produce Bio-Oil using Pyrolysis Method: Temperature Effects
Authors: Rezki Amelia Sri ,   Politeknik Negeri Lampung, Wulandari Yeni Ria , Alvita Livia Rhea , Sari Nita Pita
Published: May 2023

Indonesia memiliki banyak sumber daya biomassa seperti limbah Tandan Kosong Kelapa Sawit (TKKS) untuk alternatif bahan bakar. Limbah padat TKKS memiliki kandungan selulosa, hemiselulosa, dan lignin yang berpotensi menghasilkan beberapa produk melalui metode pirolisis. TKKS yang digunakan dari PT. Lambang Jaya, Lampung Selatan, Indonesia. Tujuan studi ini adalah karakterisasi bio-oil yang dihasilkan dari limbah TKKS serta mengetahui faktor yang mempengaruhi produksi bio-oil. Percobaan dilakukan pada variasi temperatur 300°C, 350°C, dan 400°C, dengan biomassa TKKS berukuran 1 mm dalam reaktor pirolisis. Studi karakteristik fisika-kimia bio-oil yang diperoleh pada penelitian ini yaitu yield bio-oil, pH, densitas, viskositas, dan heating rate. Studi Karakteristik pirolisis TKKS yang diperoleh pada penelitian ini adalah yield bio-oil antara 4,32-6,49%, yield asap cair 33,03%-37,44%, yield arang 33,33%-38,35%, dan yield gas 23,53%-26,91%. Hasil pH bio-oil bersifat asam karena memiliki pH antara 3,4-3,8, densitas bio-oil 1,146-1,296 g/ml, viskositas 18,443-20,860 cP serta heating rate 4,6-6,5 °C/menit yang dikategorikan dalam jenis pirolisis lambat karena dioperasikan pada temperatur rendah dan waktu tinggal ≥ 30 menit. Pengaruh temperatur pada yield bio-oil menunjukkan semakin tinggi temperatur proses yield bio-oil yang dihasilkan semakin tinggi. Melalui studi karakteristik yang dilakukan pada pirolisis TKKS produk yang dihasilkan menarik untuk dikembangkan pemanfaatannya dengan memperhatikan parameter proses yang berpengaruh.
The individualized instruction application for personal-social skills of students with intellectual disabilities
Authors: Ishartiwi Ishartiwi , Handoyo Rendy Roos , Prabawati Wening , Suseno Adi
Published: May 2023

Individualized learning is an ideal form of intervention for students with intellectual disabilities due to the ability to accommodate the learning requirements of personal-social skills. Although there are contradictions in its implementation, special education teachers have tried to implement it. This survey research aims to identify teachers' experiences in carrying out individualized learning including aspects of forms, constraints, and impacts on students' personal-social skills. The data collection was retrieved through a questionnaire instrument fulfilled by 116 special education teachers in Yogyakarta, who were determined by purposive sampling and analyzed descriptively and quantitatively. The result shows that 88,2 % of teachers apply individualized instruction methods in the form of a classical learning design with functional academic material content. The main obstacle comes from teachers' perception regarding students' condition heterogeneity, which resulted in difficulties in designing the learning activity. The impact on personal-social skills for all aspects shows that 50%-80% of students are able to improve their skills through practice and repetition. In conclusion, individualized instruction applications varied according to teachers' perceptions. While constrained to accommodate each student's requirement, this learning method resulted in a positive impact on skill learning outcomes.
Student’s creative model in solving mathematics controversial problems
Authors: Subanji Subanji , Nusantara Toto , Sukoriyanto Sukoriyanto , Atmaja Satriya Adika Arif
Published: May 2023

For students to compete with the rapid advancement in science, technology, and the arts, creativity must be more than just a necessary skill. This study of levels of creativity performed when addressing statistical issues is a follow-up to earlier studies. To create a distinctive model, a controversial aspect was used. The study revealed that there were five levels of creative models, in addition to the three levels of the earlier research: pre-imitation, imitation, modification, combination, and construction. The pre-imitation stage is defined by the subject's limited capacity for imitation. The level of imitation is determined by the act of copying methods even when one does not actually understand them. The modification level is essentially defined by the process of altering a procedure so that it can be applied to solve an issue. The process for merging several settings or problem-solving strategies also serves to define the level of combination. The construction level is determined by the process of developing new methods to handle problems.
In-service training governance, for elementary school teachers in Indonesia
Authors: Arwildayanto Arwildayanto , Wiyono Bambang Budi , Rusdinal Rusdinal , Dewi Sari , Ashokan Varun , Wolok Eduart , Said Hariadi
Published: May 2023

This research seeks to explore the governance of in-service training for elementary school teachers so they can be involved in various types, techniques, and training materials. The research design was categorized as mixed methods using both quantitative and qualitative methods. Applied to the concurrent transformative strategy model. The author analyzes perspectives from various frameworks, to get comprehensive results. The finding is that there are still a group of elementary school teachers who have not received in-service training, some have repeatedly received in-service training, and some have even received in-service training more than 5 times. The governance of in-service training in the form of a roadmap has the values of fairness, equity and proportionality in distributing training services to elementary school teachers which are supported by digital-based platforms. So that teachers can easily access, download, document training materials and evidence, and the government as teacher managers can use their track record to assess professionalism and give them the opportunity to become teacher leaders.
Language teachers’ ICT up-take in a single university in the developing country Kazakhstan
Authors: Nogaibayeva Akmarzhan A. , Kassymova Gulzhaina K. , Triyono Sulis , Winantaka Binar
Published: May 2023

This article reports on the findings of what we consider to be the first study of its sort on the use of ICT (information and communication technology) in English, Russian, and Kazakh language teachers in a single university in Kazakhstan. Participants include 111 (English, Russian, Kazakh) instructors from three departments. The study’s goal was to look at these language teachers’ ICT use and the elements that influence their use of ICT as a teaching tool. The following study issues were addressed using questionnaires and follow-up semi-structured interviews: What is the present state of information and communication technology (ICT) use among a group of language teachers in a single university in Kazakhstan? What ICT skills do language teachers have, and what training is available? What are factors that encourage/discourage the use of ICT in their teaching and learning? Findings support the idea that most teachers have owned their own computers to be used in the class and most teachers in the study had adequate skills. However, computer use is mainly limited to PowerPoint presentations but there are patterns of creative ICT use. Positive factors affecting ICT use include willingness to ICT use in teaching and the benefits to both teachers and learners, while negative factors include inadequate professional support, poor training, and the need for a more holistic approach to ICT integration. The conclusions are that ICT is acknowledged as essential and advantageous to language learners as well as teachers from a teaching perspective and that teachers require additional training: to provide training opportunities at the institutional level to support their ICT use and to help language teachers better understand the pedagogy of technology use and incorporate ICT into their instruction. The authors propose that this type of support might be offered through professional development activities that are tailored to the context of language teaching and learning.
Improving student’s self-efficacy through inquiry learning model and modeling in physical education
Authors: Hakim Hikmad , Hasmyati Hasmyati , Zulfikar Muhammad , Anwar Nur Indah Atifah , Santos Hezron Alhim Dos , Hamzah Alimin
Published: May 2023

The study aims to reveal the effect of inquiry learning model with modeling application to improve students' self-efficacy. Single-mastery and multiple-coping are used in the modeling. The study used nonequivalent pre-test and post-test control group design. The first experimental group received the inquiry learning model treatment with single-mastery modeling. The second group received received the inquiry learning model treatment with multiple-coping modeling. The direct learning model applied to the control group. Eighty seven students from three classes were taken as research sample using cluster random sampling technique. The treatment lasted for six meetings which were divided into one meeting every week. The instrument used is the physical education self-efficacy scale which was developed in this study based on Bandura's self-efficacy theory. Paired sample t-test and ANCOVA were used to analyze the data. In the two experimental groups, there was significant increase in students' self-efficacy through the application of the inquiry learning model with single-mastery modeling and the inquiry learning model with multiple-coping modeling. Inquiry learning model with multiple-coping modeling is more effective in increasing students' self-efficacy than inquiry learning model with single-mastery modeling and direct learning model.
Canada’s Student Mental Health Network: Protocol for a Comprehensive Program Evaluation
Authors: Ecclestone Amy , Linden Brooke , Monaghan Caitlin , Zheng Sally
Published: May 2023

Background

Prevalence estimates for mental health–related problems, including above-average stress, psychological distress, and symptoms of mental illnesses have increased significantly among Canadian postsecondary students. As demand for downstream mental treatment has surpassed many institutions’ abilities to deliver timely care, there is a need for innovative upstream supports that foster mental health promotion and mental illness prevention among this population.

Objective

Supported by an extensive network of student volunteers, Canada's Student Mental Health Network is a virtual, one-stop shop for centralized mental health education and evidence-based resources tailored to postsecondary students. This article describes a protocol for the comprehensive evaluation of the Network.

Methods

Development of the Network was developed using a participatory action research framework. Network content is created and curated by students and reviewed by subject matter experts. The proposed program evaluation will include both a formative process evaluation and a summative impact assessment to determine the feasibility, acceptability, and utility of the Network in addition to assessing change in the 3 primary outcomes of interest: mental health literacy, perceived social support, and help-seeking behavior. Participants will be recruited directly from the Network website using a “rolling” recruitment approach to allow for continuous data collection and evaluation. A combination of qualitative (ie, interviews) and quantitative (ie, surveys) methods of data collection will be used.

Results

The process of evaluation of the Network will begin in September 2022, collecting data for 1 year. In September 2023, the impact evaluation will begin using the same follow-up schedule. Data collection will then remain ongoing to facilitate the continued evaluation of the Network. Reports detailing evaluation data will be released annually.

Conclusions

The Network is a novel and innovative method of delivering universal mental health promotion to Canadian postsecondary students by providing centralized and freely accessible mental health education and resources, created by students and validated by subject matter experts. The continued creation and curation of resources for the Network will be ongoing to meet the evolving needs of the target population.

International Registered Report Identifier (IRRID)

PRR1-10.2196/41521