bluuebunny/crossref_metadata_2025 huggingface dataset:
การพัฒนาคู่มือการสอนการลับมีดกลึงปาดหน้าด้วยวิธีการสอนแบบย้อนกลับ
Authors: โค้วตระกูล พิเชษฐ์ ,   มหาวิทยาลัยเทคโนโลยีราชมงคลล้านนา, แสงสุวรรณ กัมปนาท ,   มหาวิทยาลัยเทคโนโลยีราชมงคลล้านนา
Published: July 2024

การวิจัยครั้งนี้มีวัตถุประสงค์เพื่อ 1) สร้างคู่มือการสอนการลับมีดกลึงปาดหน้าด้วยวิธีการสอนแบบย้อนกลับ และ 2) ทดลองสอนตามคู่มือการสอนการลับมีดกลึงปาดหน้าด้วยวิธีการสอนแบบย้อนกลับ โดยการพัฒนาคู่มือการสอนฯ ให้ผู้เชี่ยวชาญที่มีความเชี่ยวชาญด้านการจัดการเรียนการสอนในสาขาวิชาดังกล่าว จำนวน 3 คน เพื่อประเมินคุณภาพของคู่มือ คู่มือฯ มีผลการประเมินในระดับดี ทดลองนำคู่มือประเมินกับกลุ่มตัวอย่างซึ่งเป็นนักศึกษากลุ่ม A จำนวน 24 คน เป็นกลุ่มควบคุม และนักศึกษา กลุ่ม C จำนวน 16 คน เป็นกลุ่มทดลอง รวมกลุ่มตัวอย่างทั้งสิ้น 40 คน ผลการวิจัยพบว่าคู่มือการสอนการลับมีดกลึงปาดหน้าด้วยวิธีการสอนแบบย้อนกลับ ผู้เรียนมีผลสัมฤทธิ์ทางการเรียนสูงขึ้นร้อยละ 25.36 และมีความพึงพอใจต่อคู่มือการสอนการลับมีดกลึงปาดหน้าด้วยวิธีการสอนแบบย้อนกลับในระดับถึงพอใจมาก
El liderazgo como componente de las capacidades dinámicas de las organizaciones
Authors: Rueda Sánchez Mónica Patricia , Sigala Paparella Luis Eduardo , Zapata Rotundo Gerardo José , Armas Calderón Wilmer José
Published: July 2024

Las capacidades dinámicas permiten comprender el rol clave de la gestión estratégica de las organizaciones para reconfigurar sus habilidades, recursos y competencias en función de un entorno cambiante. Son consideradas como un constructo multidimensional que se expresa por medio de varios elementos. En tal sentido, este ensayo descriptivo tiene como objetivo vincular el liderazgo como uno de sus componentes principales. El análisis se realizó a partir de diversos artículos científicos sobre el tema con el fin de presentar la perspectiva de los autores consultados. Los hallazgos permiten afirmar que el liderazgo es una habilidad que requieren las empresas para coordinar, combinar y transformar recursos en procura de lograr ventajas competitivas. Estos elementos refuerzan la idea de que las capacidades dinámicas requieren la creatividad, actitud emprendedora y liderazgo de los directivos de las empresas.
Collaborative Carousel: Nutresa Group
Authors: Zuñiga Rodriguez Eberto , Márquez Ferro Guillermo Eduardo , López Orozco Gloria Mercedes
Published: July 2024

By the year 2005, the meat business sector formed by “Rica Rondo S.A.”, “Industria Nacional de Alimentos S.A.”, “Suizo S.A.”,” Zenú S.A.”, and “Almacenes La 14 S.A.” started a new strategic alliance aiming to increase their supply chain efficiency, a strategy they named “Collaborative Carousel”. Their main goal was to improve delivery times, reception and assortment of of brands such as: “Zenú”, “Rica Rondo”, and “Suizo” in the ten “Alma - cenes La 14 S.A.” stores, looking forward to ensure the best service for the final consumer. The result of this experience helped generate a collective knowledged, which allowed everyone to identify improvement opportunities in their logistics operations. This article presents a success story based on the application of the principle of collaboration in last mile processes. The methodology used corresponds to the narrative case method, presents the business evolution of several businesses, accounts for the success of the collaborative carousel type articulation process (step by step), which links resources, actors, interests, culture, and results.
O Livro dos Amantes
Authors: Palinhos Jorge
Published: July 2024

Os 100 Melhores Planos do Cinema é uma obra de fôlego que oferece uma panorâmica do cinema com base naquilo que é a sua unidade mínima, o plano, deste modo proporcionando uma visão daquilo que é o estudo do cinema em Portugal e a cinefilia portuguesa contemporânea.
Transver sendo: Observações sobre a exposição “Caleidoscópio: Cotidiano em Movimento”, Rio de Janeiro (2023-2024)
Authors: Lara Laís
Published: July 2024

O texto oferece uma leitura da exposição “Caleidoscópio: Cotidiano em Movimento”, patente no Centro Cultural dos Correios do Rio de Janeiro entre o final de 2023 e início de 2024.  Para tal, proponho um diálogo entre exposições, curadorias e práticas da videoarte, culminando no que entendo por audiovisual contemporâneo.
Using the e-learning Maturity Model to Identify Good Practice in E-Learning
Authors: Marshall Stephen
Published: July 2024

E-learning is a complex endeavor which presents significant challenges as the scale and complexity of different technologies and pedagogical models grows. The e-learning Maturity Model is a quality framework aimed at helping educational institutions engage with this complexity both by understanding the state of their current organizational e-learning capability, but also by providing tools aimed at systematically improving that capability. The eMM framework includes an extensive body of information drawn from the literature but is also intended to help identify useful examples from different institutions so these can inform other organization seeking ideas for their own situation. This paper describes a number of such examples of good practice identified as part of an ongoing project applying the eMM to Australian universities, and signals the potential outcomes possible from a more complete sample in the future.
Keywords: e-learning maturity model, eMM, quality
Virtual worlds in Australian and New Zealand higher education
Authors: Gregory Sue , Fardinpour Ali , Jacka Lisa , Grant Scott , Jegathesan Jay Jay , Stokes-Thompson Frederick , Campbell Chris , Loke Swee-Kin , Gu Ning , Bogdanovych Anton , Steel Caroline , McKeown Orwin Lindy , Gregory Brent , Hillier Mathew , Butler Des , Hearns Merle , Ellis David , Gaukrodger Belma , Wang Xiangyu , Scutter Sheila , Schutt Stefan , Trescak Tomas , Neuendorf Penny , Kerr Tom , Reiners Torsten , Lee Mark J. W. , Holloway David , Flintoff Kim , McDonald Marcus , Zagami Jason , Salinas Jamie Garcia , Newman Christine , Farley Helen , Simoff Simeon , Bower Matt , Warren Ian , Wood Denise , Linegar Dale , Brown Ross , Giovanangeli Angela , Muir-Cochrane Eimear , Larson Ian , Miller Charlynn , Knox Vicki , Meredith Grant , Le Rossignol Karen , Basu Arin , Mathews Shane , Masters Yvonne , Atkins Clare , Cram Andrew , Jacobson Michael
Published: July 2024

3D virtual reality, including the current generation of multi-user virtual worlds, has had a long history of use in education and training, and it experienced a surge of renewed interest with the advent of Second Life in 2003. What followed shortly after were several years marked by considerable hype around the use of virtual worlds for teaching, learning and research in higher education. For the moment, uptake of the technology seems to have plateaued, with academics either maintaining the status quo and continuing to use virtual worlds as they have previously done or choosing to opt out altogether. This paper presents a brief review of the use of virtual worlds in the Australian and New Zealand higher education sector in the past and reports on its use in the sector at the present time, based on input from members of the Australian and New Zealand Virtual Worlds Working Group. It then adopts a forward-looking perspective amid the current climate of uncertainty, musing on future directions and offering suggestions for potential new applications in light of recent technological developments and innovations in the area.
Mobile devices for learning in Malaysia
Authors: Song Helena S. Y. , Murphy Angela , Farley Helen
Published: July 2024

Since 2010, there has been a visible increase in the amount of research focused on mobile learning in higher education in Malaysia. To determine if this increase corresponds to an increase in the use of mobile devices to support student learning, data from two surveys conducted in 2008 and 2013 were compared to determine the changes in rates of ownership and use of mobile devices among students. In 2008, although all students owned feature phones very few had access to other mobile devices and rarely used them to support their learning. In 2013, the picture had changed significantly, with some 80 per cent of students owning smart phones and all had access to mobile devices of some sort. Additionally, students were using these devices to support their learning in a number of ways. The paper concludes with indications and implications for future research.
Where to from here?
Authors: Smith Simon D. , Griffith Michael , Wong Wai-Leng , McDonald Paul
Published: July 2024

The New Media Age has ushered in new opportunities, challenges and demands in the delivery of higher education. Access to information and people anywhere/anytime is transforming traditional education models and changing teaching and learning approaches. In this paper, we reflect on current assessment practices in higher education and consider the impact the New Media Age is likely to have on the future of assessment. Examining education technology trends, we present a model that predicts the expansion of assessment along two dimensions: an involvement continuum and an accessibility continuum. The former consists of a scale intrapersonal to interpersonal while the latter consists of a scale fixed to flexible. Higher education assessment has traditionally provided for a relatively fixed spatiotemporal accessibility and intrapersonal involvement context. In this paper we suggest that the new media phenomenon will extend assessment provision further into flexible spatial and temporal accessibility, and deeper into interpersonal involvement.
Keywords: Future Assessment, New Media Age.
Beyond Open Access
Authors: Ren Xiang
Published: July 2024

This concise paper reviews the research and practice of open innovations in scholarly publishing, facilitated by the dynamics of open access, Web 2.0, and social media. Compared with traditional publisher-mediated system, open publishing not only provides a vast amount of openly accessible content, but also introduces a new communication system characterized by "publish then social filter". This paper aims to theorize the defining features of open publishing innovations and their impact on future digital scholarship. It also critically discusses the challenges for the uptake of open publishing in scholarly communication. It concludes by linking open publishing with a wider open knowledge communication system including open education and open science, from which future research suggestions are derived.
Higher Education Teachers' Understanding of Flexibility and Enhancement in a Learning Management System
Authors: Pawlaczek Zofia , Souter Kay , Ting Aleisha
Published: July 2024

In as much as Learning Management Systems (LMS) are environments for learning, they are also design-spaces for higher education (HE) teachers to assemble content for the coherent presentation of a course. In the age of the app, where there is software for any number of digital prosthetics, LMS have attempted design-flexibility by supporting third-party plugins to load within the LMS interface. This is not a new idea and has been mastered in audio and image editing with incredible results in terms of creativity. LMS providers have been slow to respond to digital progress, and current LMS versions seem unable to fully support third-party flexibility; despite the opportunity third-party apps provide to enable creativity and enhancement. This preliminary study has shown that HE teachers, in one institution, do not experience seamless integration of plugins, are unable to keep pace with change and are wiling to have fewer choices of tools with a greater focus on proficiency of them.
Mobile Learning at Charles Sturt University
Authors: Klapdor Tim , Uys Philip
Published: July 2024

The mLearn Project at Charles Sturt University (CSU) started in 2011 as an initiative to explore mobile learning and its application and potential for the institution. This paper provides a meta-perspective of one particular aspect of the project, a series of university-wide device trials, and describes what took place, the initial findings, discussions related to mobile and the key recommendations from the project. The project has provided a way for the university to explore new technology within its specific and unique learning and teaching contexts. It has provided real world experiences from which to learn and through exploration a better understanding of our present has been reached. This paper is an attempt to share the examples and experiences and provide a basis to imagine our future direction.
'It's not the university experience we were expecting'
Authors: Jefferies Amanda
Published: July 2024

This paper reports from a 2012 small-scale study with campus-based undergraduate students at an Australian research-focussed university. The students' ownership of learning technologies was examined alongside their appreciation and experience of online learning opportunities. It came to light that a number of the students having opted for a campus- based experience were less willing to embrace fully the wider blend in learning that the learning environment provided. These digitally competent and literate students held a somewhat stereotyped expectation of university teaching as being a didactic process within a classroom with some blend of online learning activities. The students typically owned a range of personal technologies and they were avid users of one particular social network - Facebook. This preference for a single social network above all others has been found to be true in both prior UK studies (Ofcom, 2012) and US experiences (Dahlstrom, 2012). The students generally considered themselves as consumers of technology to support their learning rather than as engaging with university LMS to transform their learning approach. Suggestions for improving the scaffolding of learning are made.
Getting the full picture
Authors: Doyle Joanne , Farley Helen , Martin Neil
Published: July 2024

The process of storyboarding has long been used in the cinematic industry for scoping out, through sketches and illustrations, the sequence of narrative activities for film production. More recently, storyboarding has been used for user experience design, multimedia prototyping and mobile app development. This paper describes how researchers in a project team used storyboarding as part of a User-Centred Software Engineering (UCSE) approach to determine stakeholders' needs when designing an internet-independent version of Moodle. Storyboarding proved to be an effective way to capture a wide range of functionality requirements and align project outcome perspectives for the 'ideal product'. Most importantly, the storyboarding process enabled early detection of knowledge gaps and skillsets so that strategies could be devised to bridge the gaps. This paper will outline the storyboarding process, the gaps unearthed and the strategies employed to overcome identified skills and knowledge shortages.
The Digital Book in Higher Education
Authors: Arenas Edilson , Barr Avron
Published: July 2024

This paper deals with the evolution of the book in the context of higher education. Digital books, or ebooks, need not be restricted to duplication of the printed page on a tablet device. As higher education embraces online learning, the tablet-based offerings from educational publishers will increasingly incorporate a variety of cloud-based learning activities and resources. These next- generation ebooks and etextbooks will look more like mobile apps than books. They will need to exchange data with a growing list of educational systems for student management, lesson planning, record keeping, learning analytics, assignment scheduling, massive open online course (MOOC) platforms, and so on. The Actionable Data Book project is a research and development effort undertaken this year to determine how to implement the added functionality required of educational ebooks in a way that will allow them to plug-and-play with other systems.
On Vafa–Witten equations over Kähler manifolds
Authors: Chen Xuemiao
Published: July 2024

In this paper, we study the analytic properties of solutions to the Vafa–Witten equation over a compact Kähler manifold.
Simple obstructions to the existence of nontrivial solutions are identified.
The gauge theoretical compactness for the

C
∗

\mathbb{C}^{*}

invariant locus of the moduli space is shown to behave similarly to the Hermitian Yang–Mills connections.
More generally, this holds for solutions with uniformly bounded spectral covers such as nilpotent solutions.
When spectral covers are unbounded, we manage to take limits of the renormalized Higgs fields which are intrinsically characterized by the convergence of the associated spectral covers.
This gives a simpler proof for Taubes’ results on rank two solutions over Kähler surfaces together with a new complex geometric interpretation.
The moduli space of

SU
⁢

(
2
)

\mathsf{SU}(2)

monopoles and some related examples are also discussed in the final section.
The Urgent Need for a Carve Out Exception in the United Nations Security Council Veto Power
Authors: Johnson Kevin
Published: July 2024

The present article analyzes the ineffectiveness of the United Nations’ enforcement of biological warfare violations. After the Biological Warfare Convention (BWC) of 1972, little has been done to punish violations. This is in part to the failure of the BWC to implement an accountability system. Additionally, the sanctioning powers of the United Nations Security Council have been routinely stymied by the veto powers of the five permanent members (China, Russia, United States, United Kingdom, and France). To ensure countries abide by the BWC, a solution is needed regarding veto powers. This article proposes that the United States should pursue a United Nations amendment creating a narrow carve-out exception of the veto power in relation to biological warfare violations.
The crystal structure of 1,3-bis(2,4-dinitro-1H-imidazol-1-yl)propane
Authors: Cong Chen , Lulu Liu , Jihui Zhang , Jinfeng He , Lizhen Chen , Jianlong Wang
Published: July 2024

C9H8N8O8, monoclinic, P21/c (no. 14), a = 12.0387(3) Å, b = 10.7899(2) Å, c = 11.4310(3) Å, β = 111.536(3)°, V = 1,381.18(6) Å3, Z = 4, R

gt
(F) = 0.0499, wR

ref
(F
2) = 0.1396, T = 293 K.
Analyzing the efficacy of waste marble and glass powder for the compressive strength of self-compacting concrete using machine learning strategies
Authors: Guan Qing Tao , Tong Zhong Ling , Amin Muhammad Nasir , Iftikhar Bawar , Qadir Muhammad Tahir , Khan Kaffayatullah
Published: July 2024

Self-compacting concrete (SCC) is well-known for its capacity to flow under its own weight, which eliminates the need for mechanical vibration and provides benefits such as less labor and faster construction time. Nevertheless, the increased cement content of SCC results in an increase in both costs and carbon emissions. These challenges are resolved in this research by utilizing waste marble and glass powder as cement substitutes. The main objective of this study is to create machine learning models that can predict the compressive strength (CS) of SCC using gene expression programming (GEP) and multi-expression programming (MEP) that produce mathematical equations to capture the correlations between variables. The models’ performance is assessed using statistical metrics, and hyperparameter optimization is conducted on an experimental dataset consisting of eight independent variables. The results indicate that the MEP model outperforms the GEP model, with an R
2 value of 0.94 compared to 0.90. Moreover, the sensitivity and SHapley Additive exPlanations analysis revealed that the most significant factor influencing CS is curing time, followed by slump flow and cement quantity. A sustainable approach to SCC design is presented in this study, which improves efficacy and minimizes the need for testing.
New technologies in the face of AI challenges
Authors: Marszałek Anna ,   Narodowe Centrum Nauki
Published: July 2024

This article is of an illustrative nature, and aim to shed some light in the currently popular debate: the dynamic development of artificial intelligence. On the one hand it can be very helpful for all humans, but used in the wrong way, and moreover without control, it can be very dangerous, which is why legal and ethical regulations are so very necessary. The same applies for launching the whole process of its technology control. ChatGPT serves as an illustration of the disruptive innovations presented in this article.
Discovering Novel Social Preferences Using Simple Artificial Neural Networks
Authors: Ueshima Atsushi , Takikawa Hiroki
Published: July 2024

How do we make decisions about allocating scarce resources to others when we face multiple alternatives? While people usually evaluate multiple allocations jointly or non-independently, distributional preferences have been analyzed through behavioral models that assume independent evaluation. Here, we explore distributional preferences that can be identified when we analyze allocation decisions with a flexible model class that can factor in joint evaluation. In Study 1, we recruited 3,006 Japanese crowd workers and provided them with 13,041 theoretically designed resource allocation problems. Using artificial neural networks, we discovered two types of allocation problems among 13,041 problems where the choices made by the participants could only be predicted with a model that factored in joint evaluation of two options. For example, one of these problems showed that the participants became sensitive to differences in their self-reward between two allocations which pitted the participants against disadvantageous equity, which could be naturally supported by our intuition but could not have been discovered unless joint evaluation was considered. In preregistered Study 2, we recruited 185 Japanese participants to conduct a conceptual replication of the machine-discovered distributional preferences. We had participants evaluate two allocation options on the same (i.e., jointly) or different (i.e., separately) screens, confirming that the distributional preferences discovered in Study 1 (i.e., joint-evaluation situation) were more often observed in the former joint-screen situation. Our findings showcase the usefulness of a prediction-oriented machine learning approach to the exploration of novel behavioral theories in social decision-making.
Modyfikacje podatków dochodowych a samodzielność finansowa samorządów lokalnych w Polsce – analiza empiryczna na przykładzie wybranych gmin
Authors: Felis Paweł ,   Szkoła Główna Handlowa w Warszawie, Bernardelli Michał , Malinowska-Misiąg Elżbieta , Otczyk Grzegorz ,   Szkoła Główna Handlowa w Warszawie,   Szkoła Główna Handlowa w Warszawie,   Ministerstwo Finansów
Published: July 2024

Purpose – The purpose of the study was to assess changes in sources of community income created by tax changes and how they could be evaluated in the context of local financial autonomy. Only the most essential changes in the years 2015–2022 were taken into consideration. Research method – The empirical analysis was conducted based on data from the Ministry of Finance, Local Data Bank of Statistics Poland, and a survey study carried out among communities of 6 selected voivodeships. A correlation analysis (rank-biserial and fi coefficients) was used. Results – The tax system changes have effects of various nature and significance in the context of their impact on general governance. Most of the tax changes were introduced as part of the Polish Deal (Pol. Polski Ład) socio-economic program and had a negative impact on the structure of income of local government units. The financial autonomy of the communities was limited, however the study results indicate that the scale of the problem depended on the type of community, its location, and the amount of income obtained from income taxes. Originality / value / implications / recommendations – The study has used an original approach in which statistical financial data from communities was compiled with survey responses. Relations between pairs of survey questions were identified with correlation factors. Then, they were confronted with the characteristics of a community, i.e. its type and the ratio of income from shares in income tax revenues to total income.
Główne przesłanki rekomunalizacji gospodarki wodociągowo‑kanalizacyjnej na przykładzie Gdańska
Authors:   Uniwersytet Marii Curie-Skłodowskiej w Lublinie, Czaplak Joanna
Published: July 2024

Purpose – Identifying key reasons for remunicipalisation in the municipal sphere using the example of water supply and sewage management in Gdańsk and assessment of the nature of this phenomenon against the background of world trends. Research method – Remunicipalisation is a little-known phenomenon, therefore the qualitative method was chosen to analyze the reasons for remunicipalisation – a case study using the example of the company Saur Neptun Gdańsk S.A. The qualitative analysis has been complemented by a quantitative analysis of the economic efficiency of water supply and sewage services. Results – Remunicipalisation in Gdańsk had certain features that match world trends: pragmatic reasons and a mechanism based on the expiration of the contract. In many countries, remunicipalisation resulted from disappointment with privatisation. However, the case study showed that this phenomenon is not the opposite of privatisation and neoliberal reforms but is one of public management strategies. Originality/value/implications/recommendations – Remunicipalisation is a phenomenon rarely discussed in subject literature. Understanding the specifics of remunicipalisation in Poland can make a significant contribution to the debate about its importance in shaping the ways in which local governments implement their tasks.
Debudżetyzacja finansów publicznych – analiza potencjalnych korzyści i ryzyk
Authors:   Uniwersytet w Białymstoku, Łapińska Patrycja
Published: July 2024

Purpose – The purpose of the article is to show the scope and specifics of debudgetization of public finances in Poland in the years 2012–2022 and to indicate the key implications of debudgetization for the public finance system. Research method – A targeted review of literature, legal acts and analises of the implementation of the state budget and monetary policy assumptions carried out by the Najwyższa Izba Kontroli in 2012-2022. Descriptive, comparative and empirical analysis were used. Results – The analises conducted indicate a clear increase in the importance of debudgetization in Poland. Under appropriate conditions, debudgetization may constitute an important instrument for managing public finances, but when debudgetization is motivated by political changes or high social expectations, it carries a risk of mismanagement of public funds, irregularities and abuses. Originality / value / implications / recommendations – The study presents a broad comparative analysis of the scope of debudgetization in Poland. Due to the dynamically increasing amount of public funds available to the off‑budget economy, it is important to determine the effects of this phenomenon.
Una aproximación intercultural e interdisciplinaria para el estudio de lo religioso (hagiografía) y sus distintas manifestaciones
Authors: Calvo Díaz Andrea
Published: July 2024

The purpose of this article is to provide a conceptual approach to the study of religion through an intercultural and interdisciplinary perspective. As an example, it considers hagiography and its various manifestations in the artistic and cultural domains, among others. This study proposes three points of discussion. Firstly, it addresses an approach and delimitation of the religious aspect, specifically focusing on the worship of San Benito de Nursia. Additionally, it considers the Latin American political context and its approach to religión. Secondly, it characterizes the religious aspect through the veneration of the Black Christ of Esquipulas and the Marian rite of the Candelaria, which involves the syncretism of the Pachamama. Lastly, it emphasizes the importance of interdisciplinary approaches to religious topics, using the hagiography of Santo Domingo de Heredia as an example. In summary, this study proposes three axes of analysis to evaluate the significance of interdisciplinary studies in the field of religion.
Pramanas ar portretas? Semiotinis Prospero Merimee „Lokio" skaitymas
Authors: Nastopka Kęstutis
Published: July 2024

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Erdvių ir laikų sankirtoje
Authors: Mačianskaitė Loreta
Published: July 2024

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Šiandieninės kultūros tyrimų plotmės
Authors: Kavolis Vytautas
Published: July 2024

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Комбінаційне розсіювання світла склоподібним тетраборатом літію, активованим оксидами ербію та тербію
Authors: Danylyuk P.S. , Rizak G.V. , Gomonai O.I. , Puga P.P. , Frolov A.O. , Gomonai A.N. , Rizak V.M.
Published: July 2024

Дослiджено спектри комбiнацiйного розсiювання склоподiбного тетраборату лiтiю, активованого оксидами ербiю та тербiю рiзної концентрацiї. Встановлено, що основну частину структури спектрiв комбiнацiйного розсiювання дослiджених зразкiв скла Li2B4O7 : Er2O3 та Li2B4O7 : Tb2O3 у межах усередненого порядку зумовлено змiшаними коливаннями складних бор/лiтiй/ербiй/тербiй-кисневих структурних комплексiв.
Електрокерування поверхневими плазмонними коливаннями в гомеотропній комірці нематичного рідкого кристала
Authors: Yakovkin І.І. , Ledney M.F.
Published: July 2024

Теоретично вивчається iндукована електричним полем орiєнтацiйна нестiйкiсть директора в комiрцi гомеотропно орiєнтованого нематичного рiдкого кристала (НРК) за наявностi переднахилу директора на поверхнi пiдкладинки. Встановлено, що орiєнтацiйнi переходи поля директора НРК з вихiдного однорiдного стану в суттєво неоднорiдний з наступним переходом в планарний стан, зумовленi змiною величини напруженостi електричного поля, можуть супроводжуватися гiстерезисами. За наявностi останнiх розраховано значення їх параметрiв i встановлено областi їх iснування в залежностi вiд величин параметрiв НРК-комiрки. Встановлено, що збiльшення переднахилу директора на поверхнi та зростання енергiї зчеплення НРК з похилою легкою вiссю приводять до звуження ширини петлi гiстерезису, а в подальшому i до зникнення гiстерезису зазначених орiєнтацiйних переходiв. Дослiджено поширення плазмонного поляритона на поверхнi комiрки НРК у випадку обмеженостi однiєї з її полiмерних пiдкладинок з iншого боку шаром золота. Розраховано величину ефективного показника заломлення поверхневого плазмонного поляритона (ППП) та встановлено, що вона зменшується зi збiльшенням напруженостi електричного поля. Встановлено, що дiапазон керування величиною ефективного показника заломлення ППП розширюється зi зменшенням значень кута орiєнтування похилої легкої осi та товщини полiмерного шару, а також зi збiльшенням довжини хвилi ППП та оптичної анiзотропiї НРК.
Effect of dietary supplementation of cinnamon (Cinnamomum verum Presl) extract to rainbow trout (Oncorhynchus mykiss W.) feed on the chemical and fatty acid profile of meat
Authors: Zhelyazkov G. , Stoev Ts.
Published: July 2024

Abstract. The aim of this study was to evaluate the effect of dietary supplementation with cinnamon (Cinnamomum verum Presl) on meat chemical composition and fatty acid profile in rainbow trouts (Oncorhynchus mykiss W. ), cultivated in a recirculation system. One hundred and twenty rainbow trouts were allotted into two variants - control (C) and experimental (C.v), each in two replication with thirty fish. The average intial body weight of fish was 41.55±7.76 g (control group) and 41.48±7.95 g (C.v group) and final live weights on the 60th day: 117.25±19.15 g (C) and 121.42±19.39 g (C.v). The trial was carried out in a recirculation system that maintained water chemical parameters optimal for rainbow trout farming. The 1% powdered cinnamon extract was given to fish from the C.v. group by lubrication of extruded feed granules with 5 ml/100 g feed sunflower oil, whereas the feed of controls was lubricated only with the same amount of sunflower oil. After the end of the feeding period, six groups from each group were euthanised, heads and viscera were removed, then they were filleted and deboned. The meat was minced, homogenised and chemical and fatty acid analyses were performed. The meat water, dry matter, lipid, protein and ash contents were not changed after feed supplementation with 1% cinnamon extract. However the tested phytoextract had a beneficial effect on the meat fatty acid profile. SFA content of meat was statistically significantly reduced along with considerable increase in the content of UFA, MUFA, PUFA and n-3 fatty acid groups. The levels of n-6 fatty acids were not influenced by the dietary supplementation with cinnamon extract. The beneficial effect of this additive on fatty acid content of meat was proved by the improved PUFA/SFA and n-6/n-3 ratios in the meat of group C.v. Both ratios were within the beneficial ranges from the point of view of human nutrition: above 0.4 and less than 5, respectively.
KINERJA PERTUMBUHAN DAN RESPONS FISIOLOGIS BENIH IKAN TAMBRA, Tor tambroides PADA SUHU PEMELIHARAAN BERBEDA
Authors: Laitte Muhammad Haritza , Haser Teuku Fadlon , Jaya Jaya , Nurdin Muh Saleh , Azmi Fauziah , Radona Deni , Prihadi Tri Heru , Masriah Andi , Darsiani Darsiani
Published: July 2024

Variasi suhu air memengaruhi pertumbuhan dan fisiologi organisme ektotermal secara langsung, termasuk ikan. Studi ini dilakukan untuk mengevaluasi pengaruh suhu air pemeliharaan terhadap performa pertumbuhan dan respons fisiologis benih Tor tambroides. Penelitian ini menggunakan rancangan acak lengkap (RAL), terdiri atas empat perlakuan suhu berbeda (24°C, 26°C, 28°C, dan 30°C) dan tiga ulangan. Benih Tor tambroides (panjang total 4,18 ± 0,32 cm; bobot tubuh 0,66 ± 0,03 g) sebanyak 15 ekor dipelihara per akuarium (dimensi 40 cm x 40 cm x 40 cm; volume air 40 L) dilengkapi dengan sistem aerasi dilengkapi dengan heater. Hasil penelitian menunjukkan bahwa perlakuan suhu air pemeliharaan berbeda memberikan pengaruh yang nyata (P<0,05) terhadap kinerja pertumbuhan (pertumbuhan mutlak dan laju pertumbuhan spesifik, sintasan) dan respons fisiologi (kadar hemoglobin) benih Tor tambroides. Perlakuan dengan suhu 28°C pada benih Tor tambroides menghasilkan bobot tubuh mutlak (1,01 ± 0,30 g) dan laju pertumbuhan spesifik bobot tertinggi (3,18 ± 0,14% hari-1), sintasan (99,37 ± 1,25%), dan rasio konversi pakan (FCR) terendah (0,94 ± 0,04). Kadar hemoglobin dan hematokrit tertinggi pada suhu pemeliharaan 30°C. Hasil penelitian mengindikasikan bahwa suhu air pada 28°C merupakan suhu efisien untuk pemeliharaan benih Tor tambroides.Water temperature directly affects the growth and physiology of ectothermic organisms, including fish. Hence, the experiment was conducted to study the effect of temperature variation on growth performance and physiological response of Tor tambroides juveniles. This study used a completely randomized design (CRD) with four temperature treatments (24°C, 26°C, 28°C, and 30°C) arranged in triplicates. There were 15 Tor tambroides juveniles (total length 4.18 ± 0.32 cm; body weight 0.66 ± 0.03 g) reared in each aquarium (dimensions 40 cm x 40 cm x 40 cm; water volume 40 L) equipped with an aeration system and a heater. The results showed that different rearing water temperatures had a significant effect (P<0.05) on the growth performance (absolute growth, specific growth rate, and survival rate) and the physiological response (hemoglobin value) of the Tor tambroides fingerlings. Tor tambroides fingerlings reared with temperature setting at 28°C showed the highest absolute body weight (1.01 ± 0.30 g) and highest specific growth rate of weight (3.18 ± 0.14% day-1), survival rate (99.37 ± 1.25%), and the lowest FCR (0.94 ± 0.04). The highest hemoglobin and hematocrit levels of the juveniles were found at 30°C. The study showed that the water temperature at 28°C was effective for rearing Tor tambroides fingerlings.
KONTRIBUSI BIOFLOK TERHADAP PERTUMBUHAN IKAN LELE YANG DIBERI PAKAN DENGAN TINGKAT BERBEDA
Authors: Ekasari Julie , Handayani Tri Novi , Fauzi Ichsan Achmad , Maulana Fajar , Vinasyiam Apriana
Published: July 2024

Biomassa bioflok dalam sistem pemeliharaan ikan dapat dimanfaatkan menjadi pakan alami tambahan bagi ikan. Penelitian ini bertujuan untuk mengevaluasi kinerja pertumbuhan ikan lele Clarias gariepinus yang dipelihara menggunakan teknologi bioflok dengan tingkat pemberian pakan berbeda. Perlakuan terdiri dari tiga tingkat pemberian pakan, yaitu 5% (FR5), 3,75% (FR3,75), dan 2,5% (FR2,5). Benih ikan lele dengan panjang awal 11,92 ± 0,03 cm dan bobot awal 11,31 ± 0,11 g dipelihara dengan padat tebar 25 ekor per akuarium (500 ekor m-3) selama 42 hari. Ulangan biologis tiap perlakuan berupa 3 unit akuarium (volume air 50 L). Ikan diberi pakan 3 kali setiap hari dengan jumlah pakan sesuai perlakuan. Penambahan tepung tapioka dilakukan setiap hari untuk mencapai rasio C/N 10. Hasil penelitian menunjukkan bobot akhir menurun seiring penurunan tingkat pemberian pakan (P<0,05), seperti ditunjukkan pula laju pertumbuhan spesifik. Terdapat indikasi kontribusi bioflok terhadap kinerja pertumbuhan ikan lele berdasarkan nilai efisiensi pemanfaatan pakan dan retensi protein. Akan tetapi, tidak dapat menggantikan peran pakan eksternal. Tingkat pemberian pakan berpengaruh terhadap kinerja pertumbuhan ikan lele pada sistem bioflok.Biofloc biomass could be used as additional natural food for fish in a biofloc-based fish culture system. This study aimed to evaluate the growth performance of African catfish, Clarias gariepinus cultured in a biofloc system fed at different feeding levels. The treatments consisted of three feeding levels; 5% (FR5), 3,75% (FR3,75), and 2,5% (FR2,5). Catfish juveniles with an initial average body length of 11,92 ± 0,03 cm and average body weight of 11,31 ± 0,11 g were reared at a density of 25 fish per aquarium (500 fish m-3) for 42 days. Each treatment had three unit aquaria (50 L water volume) as replicates. Cassava meal was added daily to reach C/N ratio of 10. The results showed that the fish’s final weight and specific growth rate were reduced, corresponding to the feeding rate. There was an indication that biofloc contributes to the fish growth performance based on the feed efficiency and protein retention level. However, biofloc could not replace the role of external feed to support the growth of African catfish.
APLIKASI MADU HUTAN TERHADAP MASKULINISASI, PERTUMBUHAN DAN KELANGSUNGAN HIDUP DARI LARVA IKAN NILA (Oreochromis niloticus)
Authors: Abdullah Nursanti , Irfan M , Yuliana Yuliana , Subur Riyadi , Munaeni Waode
Published: July 2024

Ikan nila (Oreochromis niloticus) mempunyai kemampuan tinggi dalam bereproduksi, sehingga sulit untuk mencegah inbreeding yang menyebabkan lambatnya pertumbuhan. Salah satu alternatifnya adalah dengan maskulinisasi atau budidaya ikan monoseks dengan satu jenis kelamin saja. Madu memiliki kandungan chrysin dan kalsium yang berperan dalam maskulinisasi. Tujuan dari riset ini idalah mengevaluasi penggunaan madu hutan dari Desa Pohea melalui perendaman dengan tiga level dosis yang berbeda terhadap persentase jantan, pertumbuhan mutlak serta kelangsungan hidup dari larva ikan nila. Ikan uji pada penelitian ini merupakan larva dari ikan nila umur 7 hari, dengan panjang 4,01±0,03 mm. Metode pemberian madu melalui perendaman selama 24 jam. Perlakuan terdiri dari tiga dosis madu yang berbeda yaitu dosis 1% (A), 1,5% (B), dan 2% (C), sedangkan kontrol tanpa perendaman madu (D). Hasil penelitian ini menunjukan bahwa pemberian madu hutan secara signifikan (P<0,05) memberikan persentase jantan yang lebih tinngi dibandingkan dengan kontrol. Pertumbuhan mutlak pada larva yang diberikan dosis madu 2% (C) signifikan memberikan pengaruh nyata (P<0,05) dibandingkan dengan tanpa pemberian madu atau kontrol (D). Kelangsungan hidup larva menunjukkan bahwa pemberian madu mampu memberikan kelangsungan hidup yang signifikan lebih tinggi atau berbeda nyata (P<0,05) dibandingkan dengan tanpa pemberian madu  atau kontrol (D). Dosis terbaik yang mampu meningkatkan persentase jantan, pertumbuhan mutlak, dan kelangsungan hidup adalah perlakuan dengan dosis 2% (C).Tilapia (Oreochromis niloticus) has a high reproductive ability leading to difficulty in preventing inbreeding which causes slow growth. Suppressing the effects of this trait can be done through masculinization or "monosex fish farming”. Honey contains chrysin and calcium, which play a role in masculinization. This study set out to assess the effects of forest honey, administered in varying doses via immersion method, on the survival rate, growth rate, and percentage of male tilapia larvae. The fish used in this study were tilapia larvae at 7 days old, with an average length of 4.01±0.02 mm. The method of giving honey was through immersion for 24 h. The treatment consisted of three different doses, namely 1% (A), 1,5% (B), and 2% (C), while the control was without honey (D). The findings of this study revealed that providing forest honey significantly (P<0,05) increased the percentage of males compared to the control. The absolute growth of larvae given a dose of 2% honey (C) was significantly different (P<0,05) from the control (D). The survival rate of larvae revealed that honey treatment provided significant (P<0,05) benefits over the control (D). The best dose that was able to increase the percentage of males, absolute growth, and survival rate was the treatment with a dose of 2% (C).
FILOGENETIK IKAN SUMATRA (Puntius tetrazona) ALAM DAN BUDIDAYA BERDASARKAN GEN COI
Authors: Syaifudin Mochamad , Rossanty Elydia
Published: July 2024

Ikan sumatra (Puntius tetrazona) memiliki beberapa varietas, meliputi  tiger barb, hijau, albino, dan balon. Namun, belum diketahui karaker genetiknya menggunakan DNA barcoding terhadap spesies asal perairan di Sumatra Selatan. Tujuan dilaksanakannya penelitian ini adalah untuk mengetahui persentase kemiripan sekuen gen cytochrome oxidase c subunit I (COI) DNA mitokondria, jarak genetik dan filogenetik ikan sumatra alam serta budidaya. Penelitian barcoding DNA pada ikan sumatra dilakukan dengan beberapa tahap terdiri atas isolasi DNA, perbanyakan DNA berdasarkan polymerase chain reaction (PCR), elektroforesis, dan sekuensing gen COI pada mtDNA. Ikan sumatra dari alam berasal dari Sungai Lematang (n=2), Sungai Musi (n=2), dan dari budidaya komersial (n=7) dikoleksi di wilayah Palembang. Produk gen COI mtDNA berhasil diperoleh menggunakan metode PCR dengan suhu penempelan primer 51℃ selama 30 detik dalam 35 siklus. Sekuensing gen COI menghasilkan panjang nukleotida 604 bp. BLAST-N menunjukkan ikan sumatra dari alam (Sungai Lematang dan Sungai Musi) memiliki persentase kemiripan lebih kecil (94,56-95,16%) dibandingkan dari budidaya (99,55-100%) terhadap P. tetrazona yang diperoleh dari pusat data Genbank. Konstruksi filogenetik terbentuk dua subcluster yang terpisah antara ikan sumatra alam dan budidaya dengan jarak genetik 0,046 ± 0,00, menunjukkan perbedaan genetik antara kedua populasi.Sumatra barb (Puntius tetrazona) had several strains, including tiger barb, green tiger barb, albino tiger barb, and balloon tiger barb. However, its genetic characteristics are not yet known using DNA barcoding in species from waters in South Sumatra. This study aimed to analyse similarity percentage, genetic distance, and phylogenetic construction of wild and cultured sumatra barb based on the sequence of cytochrome c oxidase subunit I (COI) gene on the mitochondrial DNA. The methods conducted in barcoding DNA were performed with several steps consisting of DNA isolations, DNA amplification based on polymerase chain reaction (PCR), electrophoresis, and sequencing of COI of mtDNA. The wild sumatra barb were obtained from Lematang River (n=2), Musi River (n=2), and those from commercial fish farming (n=7) were collected in Palembang. The mtDNA COI gene were acquired from PCR with an annealing temperature of 51℃ for 30 seconds in 35 cycles. The COI gene of sumatra barb had a nucleotide length of 604 bp. BLAST-N indicated that the wild sumatra barb (Lematang and Musi Rivers) had a lower similarity (94.56-95.16%) than the cultured samples (99.55-100%) to P. tetrazona obtained from Genbank database. The phylogenetic construction formed two separated subclusters between the wild and cultured sumatra barb with a genetic distance of 0.046 ± 0.001 indicated a genetic difference between two populations.
Factors Affecting Investment in Purpose-Built Student Accommodation in Studentified Neighbourhoods of Tertiary Institutions
Authors: Bassey Emmanuel , Olapade Daramola
Published: July 2024

This paper aimed to increase the awareness of real estate investors and developers by providing a cross-country comparison of the factors affecting investment in purpose-built student accommodation (PBSA). The paper analyses both local and international published literature to extract key findings pertaining to factors affecting investment in PBSA in studentified neighbourhood of tertiary institutions. Using a systematic literature approach in searching electronic databases, past studies were evaluated and analysed thematically based on specific content criterion for the purpose of identifying main factors driving and hindering investment in purpose-built student accommodation. The paper identified demand-related, return-on-investment related, investment-related and institutional-related factors as main drivers of investment in PBSA while e-learning facilities and potential oversupply of PBSA were identified as potential limitations affecting investment made in this real estate sub-market sector. It is therefore necessary that real estate investors should consider these factors while investment in this asset class.
Transformation of the Role of PMSCs in the Post-International World and Their Classification
Authors: Javadi Reza ,   University of Tehran, Saeid-Abadi Mohammad-Reza ,   University of Tehran
Published: July 2024

Introduction. The evolving landscape of international relations has witnessed a profound transformation in the concept of security. Traditionally, governments held an exclusive monopoly over the provision of security, relying on their military and defense forces to safeguard their interests and protect their citizens. However, the post-Cold War era has ushered in a paradigm shift, with non-state actors emerging as formidable challengers to this traditional monopoly. At the forefront of these non-governmental actors stand private military and security companies (PMSCs), organizations that offer a diverse array of military and security services to governments across the globe. Methods and materials. This comprehensive study explores the multifaceted world of PMSCs, categorizing them into three distinct types based on the nature of the services they provide: offensive, reactive, and defensive. Through an analytical-descriptive research approach and the innovative lens of postinternational theory, this research delves deep into the role of PMSCs in an increasingly interconnected world. Analysis. The central question that underpins this study is the extent of PMSCs’ influence in a post-international world and their responses to the evolving global military security environment. It scrutinizes whether governments continue to maintain an exclusive monopoly over security and military operations or if these responsibilities have been increasingly assumed by non-governmental actors like PMSCs. Results. The study comes to the conclusion that in the post-international world, governments are no longer the sole arbiters of security, and the role of nonstate actors, particularly PMSCs, has grown substantially. Their extensive military and security services, often serving as alternatives to official national armies, have reduced the necessity for government forces in conflictprone regions. This paradigm shift has effectively transformed security into a “tradable commodity,” giving further initiative and importance to the PMSCs across the international arena. Autors’ contribution. Reza Javadi has outlined the scope, idea, purpose, and objectives of the paper. He has also been engaged in the gathering, classification, and analysis of the documents that make up the main source base of the article. The second author, M. Saeid-Abadi, has helped find the library sources for the study, commented on the materials, and shared ideas about the beginning parts of the study.