bluuebunny/crossref_metadata_2025 huggingface dataset:
Perceived organizational support and outcomes: A view through the lens of the group engagement model, the role of identification, pride and respect
Authors: Tsachouridi Irene , Nikandrou Irene
Published: May 2022

According to the group engagement model, identity is a multidimensional concept, which incorporates not only the cognitive component of organizational identification but also the evaluative component of pride and respect (Blader & Tyler, 2009). In this study, we adopt the perspective of the group engagement model and the multidimensional conceptualization of social identity in order to examine the effects of perceived organizational support (POS) and two key employee outcomes, willingness to support the organization and intent to quit. More specifically, we examine whether the three aspects of social identity (identification, pride, and respect) can explain the relationship between POS and its outcomes. By doing so, we gain insight into the unique power of these components to explain the POS-outcome relationship and we contribute to a better understanding of the outcomes of POS (Kurtessis et al., 2017). Trying to provide generalizable findings with high external validity, we conducted a quantitative field study including a sample of 579 employees. Our findings indicate that identification partially explains the relationship between POS and willingness to support the organization, while identification and pride are able to partially mediate the POS-intent to quit the relationship. These findings have significant practical implications providing managers useful insight into how employees interpret and respond to perceptions of support
A high order PDE solver to price three factor derivatives
Authors: Norbert Hilber
Published: May 2022

We provide a highly accurate and fast solver to get an approximate
solution of (degenerate) parabolic partial differential equations (PDEs)
with variable, but factorising coefficients over a rectangular domain in
three space dimensions subject to an arbitrary combination of different
boundary conditions. The solver is based on a finite difference
discretisation of 4-th order in space and a ADI time marching scheme
supplemented with a Richardson extrapolation and is easy to implement.
The proposed solver is applied to different derivative pricing problems
appearing in continuous time finance such as pricing basket and exotic
options in different stochastic volatility models. In particular, we are
able to price lookback options in the Double Heston model or European
and barrier options in the Heston model with stochastic correlation to
high accuracy within a fraction of a second. This extends and unifies
recent, tailor made solutions to these pricing problems in the
scientific literature.
An efficient high-throughput screening of high gentamicin-producing mutants based on titer determination using an integrated computer-aided vision technology and machine learning
Authors: Zhu Xiaofeng , Du Congcong , Mohsin Ali , Yin Qian , Xu Feng , Liu Zebo , Wang Zejian , Zhuang Ying-Ping , Chu Ju , Tian Xiwei , Guo Mei-Jin
Published: May 2022

The ‘design-build-test-learn’ (DBTL) cycle has been adopted in rational
high-throughput screening for obtaining high-yield industrial strains.
However, the mismatch between build and test slows the DBTL cycle due to
the lack of high-throughput analytical technologies. In this study, a
highly-efficient, accurate, and non-invasive detection method of
gentamicin (GM) was developed, which can provide timely feedback for the
high-throughput screening of high-yield strains. Firstly, a self-made
tool was established to obtain datasets in 24-well ​based on the
coloring of cells. Subsequently, the random forest (RF) algorithm was
found to have the highest prediction accuracy with 98.5% for the
training and 91.3% for verification. Finally, a stable genetic
high-yield strain (998U/mL) was successfully screened out in 3005
mutants, which was verified to improve the titer by 72.7% in a 5 L
bioreactor. Moreover, the verified new datasets were updated to the
model database in order to improve learning ability of DBTL cycle.
Development of Transient Habitat Modeling for Macrozoobenthos in a Restored Stream
Authors: thepphachanh sengdavanh , Stamm Jürgen
Published: May 2022

In the European Union (EU) Water Framework Directive, EU states aim to
achieve the ambitious goal of achieving “good ecological status” for
all water bodies in the regions by 2015, but by 2027 at the latest.
However, they face many challenges, with the highest percentage (40%)
being the hydromorphology pressure on the water bodies. This results in
a huge number of restoration projects across Europe to improve
hydromorphological conditions with the expectation that ecological
conditions will subsequently be improved. However, aquatic ecology is
very complex and several variables have to be considered when dealing
with this system. The Transient River Habitat Modeling for
Macrozoobenthos in this study, developed at the Institute for Hydraulic
Engineering and Technical Hydromechanics, Technische Universität
Dresden, was improved by incorporating a fuzzy approach to handle
imprecise information such as ecological preference data. Moreover,
hydromorphodynamic (depth, velocity, mineral, and organic substrate) and
water quality factors like temperature are combined in the habitat model
so that it can broaden river physical conditions and their interactions
with biological indicators. Habitat modeling employed the mentioned
parameters to simulate suitability for the macrozoobenthos in a small
river in central Saxony, Germany. Due to its deteriorated condition,
this river was selected as a representative for thousands of kilometers
of small rivers across the region, which have been restored. The model
simulated the status quo of river conditions from spring to summer, and
the results showed that the natural flow resulted in dynamic habitat
suitability both spatially and temporally, which differs for each
species.
Optimal ordering and pricing decision for items following price sensitive quadratic demand under combined payment scheme
Authors: Shaikh Azharuddin , Mishra Poonam , Talati Isha
Published: May 2022

Three types of payments confront in business dealings viz. advance, cash and credit. A cash payment is ubiquitously practiced, while a credit payment scheme escalates sales and advance payment technique is implemented to avoid cancellation of orders. These are recognized as advance-cash-credit (ACC) payment scheme which is conventional in business transactions. By implicating ACC the aim is to determine optimal pricing and ordering policies. Inventory items observes quadratic demand being sensitive to unit selling price. Promising concavity of the profit function for both selling price and cycle time is posed numerically. Managerial insights are revealed as a concluding note.
1-mean and 1-medoid 2-clustering problem with arbitrary cluster sizes: Complexity and approximation
Authors: Pyatkin Artem
Published: May 2022

We consider the following 2-clustering problem. Given N points in Euclidean space, partition it into two subsets (clusters) so that the sum of squared distances between the elements of the clusters and their centers would be minimum. The center of the first cluster coincides with its centroid (mean) while the center of the second cluster should be chosen from the set of the initial points (medoid). It is known that this problem is NP-hard if the cardinalities of the clusters are given as a part of the input. In this paper we prove that the problem remains NP-hard in the case of arbitrary clusters sizes and suggest a 2-approximation polynomial-time algorithm for this problem.
DiHECO – Digital healthcare ecosystem research and networking
Authors: Värri Alpo Olavi , Nieminen Hannu , Helander Nina , Van Gils Mark
Published: May 2022

The DiHECO project aims at studying the role and potential of digital healthcare platforms in the European, mostly publicly arranged, healthcare service ecosystem. The project, divided into a few subprojects, tries to identify areas of research that can grow into impactful larger European projects with industry co-operation. DiHECO aims also at further developing the capacity of participants, particularly the Kaunas University of Technology, to perform relevant research in this area. In its first year, the project has made progress according to plan through joint research activities and networking events. These include the digital health tracks of the researcher and industry forum of the ICTE 2021 conference and two grant writing workshops and a scientific writing workshop.
Technology Augmented Reality Integration Hydrometeorology (TARIH) as Media Solution in Disaster Management for Physics Teacher Candidate
Authors: Wibowo Firmanul Catur , Sanjaya Lari Andres , Darman Dina Rahmi , Basyir Syifa Nabila , Gregersen Andrea Fransiska Møller
Published: May 2022

This study aims to develop Augmented Reality Integration Hydrometereology (TARIH) technology as a learning media solution for disaster management from an early warning to the effects of land subsidence. The research method used in this study is the Model ADDIE (Analysis, Design, Develop, Implement, and Evaluate). The chosen subjects of the current study were 69 physics teacher candidates aged 21-23 years at a university in Jakarta and Banten, Indonesia. Based on reliability tests obtained in this line of research, the findings disclosed that the response to the application of TARIH as media in hydrometereology learning, the reliability of the System Quality aspect was 0.69 and the mean was 4.43. Most importantly, the reliability of the information quality aspect was 0.43 and the mean was 4.39 and the reliability of the service quality aspect was 0.74 and the mean was 4.45. Based on results obtained in this line of research, the study indicated that TARIH media can be used as a learning media solution in Disaster Management from an early warning.Keywords: technology augmented reality integration hydrometeorology (TARIH), learning media, disaster learning media, physics teacher candidate.
Development of Puzzles for Chemical Laboratory Glassware Integrated with Islam as A Learning Medium
Authors: Zamhari Muhammad , Subekti Zainal Arif , Setiawati Estriana Murni , Kangkamano Tawatchai
Published: May 2022

The current research seeks to develop and assess the feasibility of puzzles for chemical laboratory glassware integrated with Islam as a learning medium. Conducted through research and development (R&D) method with a 4D model (Define, Design, Develop, and Disseminate), the present project was limited to the Develop stage. The chosen product was a puzzle of chemical laboratory equipment integrated with Islam as a learning medium. The puzzle was applied to 41 students of the chemistry education study program of UIN Sunan Kalijaga who joined laboratory management course. The assessment of the puzzle performance includes ten aspects with 32 indicators. The data obtained was in the form of qualitative and was subsequently tabulated and analyzed using the criteria for the ideal assessment category to determine the quality of the puzzle media. The developed media has a very-good quality according to the assessment among 41 students. The media obtained a score of 142.63 out of a maximum score of 160 and an ideal percentage of 89.15%. The findings disclosed that the developed media is suitable for use as a supporting learning resource for students to understand chemical glassware.Keywords: puzzle learning media; laboratory tools; integration of science and Islam
Assessing Effectiveness of Animated Instructional Media on Academic Performance and Retention of Genetics Concepts
Authors: Faruk Umar Ramatu , Aliyu Faruku , Hassan Lawal Zahriya
Published: May 2022

The present study was carried out to assess the effectiveness of animated instructional media on academic performance and retention of genetic concepts among senior secondary school on biology students in Sokoto State. Adopted through Quasi Experimental design involving pre-test, post-test and post-posttest on two equivalent groups as experimental and control, the population on the study was 10148 SS III Biology students. In this regard, four intact classes were chosen with sample size of 238 SSIII students. Genetic Concept Performance and Retention Test (GCPRT) was the instrument used for data collection. Animated Instruction Media was used as instructional material to teach the experimental group while demonstration method was used to teach the control group. Independent sample t-test was used to test the four (4) hypotheses formulated in the study. The esults obtained in this line of research revealed that there was a significant difference in the academic performance and retention ability between students taught using Animated Instructional Material and those taught using demonstration method. It was therefore recommended for other senior secondary school teachers to harness the considerable benefits of technology, particularly animations, in teaching genetics and other related concepts.Keywords: animated, media, academic performance, retention.
A Medium Is Born: Participatory Media and the Rise of Clubhouse in Russia and Ukraine During the Covid-19 Pandemic
Authors: Boyko Kateryna , Horbyk Roman
Published: May 2022

Clubhouse is a social network allowing only real-time oral communication. While its 2020 worldwide launch went largely unnoticed in Eastern Europe, it took countries such as Ukraine and Russia by storm in February 2021. Users were enticed by the platform’s exclusivity (invitation only and limited to IOS users), unusual format, and compatibility with post-covid social life. For some time, Clubhouse was the dominant theme of discussions on other social media, mainstream news media organizations started launching daily talk shows in the app, and early adopters engaged in a plethora of participatory activities ranging from propagandist broadcasts to 24/7 rooms where bots would recite Russian classical poetry, from fervently seeking ways to monetise their participation to creating the somewhat unexpected genre of audial fakes.

In this article we intend to analyse the turbulent arrival of the new app in Russia and Ukraine from the perspectives of media ecology and media archaeology. Focusing on the app’s mediality and remediation, the social media discourse about it and particular content in some of the notable rooms, we highlight the conjunction of social environment, the already existing and novel technological affordances, as well as users’ perceptions and expectations in the emergence of a new niche in the ecology of participatory media. Based on this, we will also try to outline some possible scenarios for the new platform in Eastern Europe’s dense mediascapes. We argue that the prompt rise of Clubhouse’s popularity was not thanks to its special authenticity, as some suggest, but rather because of the normalization of group long-distance conversations (e.g., via Zoom), coupled with the intentional monomedia poverty of affordances and clearly delimited boundary between the roles of broadcasters and listeners, which was perceived as liberating in a produsage-saturated environment. This actually limits the participatory media potential of content creators and influencers, increasing their power and reviving monological models of communication that suggest a passive audience.
Where We Go One, We Go All: QAnon, Networked Individualism, and the Dark Side of Participatory (Fan) Culture
Authors: Hodson Jaigris , Gosse Chandell
Published: May 2022

Participation in online spaces has afforded new fan cultures (Baym, Burnett 2009; Jenkins 2018) and enabled new communities of networked individuals (Rainie, Wellman 2012; Burgess, Jones 2020). Online participation also generates participatory cultures, which allow audiences unprecedented opportunity to connect with each other and with the media they share. However, it has also generated some decidedly anti-social and anti-democratic movements, such as QAnon (Amarasingam, Argentino 2020). In this commentary, we argue that QAnon can be thought of as a participatory fan culture gone awry. Using QAnon’s entry into mainstream culture in 2020 as a case study, we explore the darker implications of online participatory culture, including misinformation, conspiratorial- thinking, and an undermining of shared realities. Lastly, we propose that these issues are made more explicit and difficult to attend to in a media sphere characterized by dominant neo-liberal corporate control of participatory media, and digital dualism.
Participatory Cultures of Digital Games: The Double-Edged Sword of Being a Reddit Community Moderator
Authors: Nielsen Daniel
Published: May 2022

Volunteer community moderators are at the centre of a multitude of conflicting views in the media and society, while being continually exposed to inappropriate content and risking their mental wellbeing. On Reddit.com, their specific interest in a topic drives them to volunteer for moderation responsibilities to nurture the participa-tory community; however, this puts them in the uncertain position of being neither a member of the community nor a representative of the social media platform tied to the community. By adopting Nico Carpentier’s concept of participation as a site of political–ideological negotiation, this article explores the precarious conditions and expectations of community moderators around digital games after the 2020 COVID-19 struggles, with more people turning to social media, which increases demand for platform moderation. The study is based on semi-structured interviews with community moderators associated with online media communities (subreddits) of different games on the social media platform Reddit. It draws two conclusions: Firstly, the field of subreddit moderation involves multiple actors, such as content creators, content generators, moderators, and game studios. Here, moderators hold an assumed absolute power in two processes of decision-making: (1) ensure that content abides by the sitewide rules and subreddit specific rules; and (2) promote content that is sensitive to the subreddit’s cultural context. In decision-making moments, the tools that are afforded to moderators from the Reddit platform put moderators at a disadvantage, as they are forced to implement their decisions using negative reinforcement as opposed to achieving change in the subreddit through positive reinforcement. Secondly, community moderators exist within a participatory process of checks and balances, making any moderation actions a double-edged sword where any intervention by moderators can result in backlash or disagreement from content creators and content generators, and material advantages largely determine actors’ involvement in these participatory processes.
Reuse and Appropriation: Remediating Digital Museum Collections and Digital Tools for a Participatory Culture in Transition
Authors: Taher Hassan , Addo Giuseppina , Vengerfeldt Pille Pruulmann , Engberg Maria , Maare Åsa Harvard
Published: May 2022

Museums have always used different media to communicate, widen perspectives and bring new knowledge, but in the era of digital media, their various offerings are increasingly part of the media ecosystem. Our research interventions explored the possibility of reusing existing digitised material in a participatory setting. The aim was to explore the object-centred audience participatory method in digital settings. We held a series of digital and in-person workshops that invited the participants to “imagine” narratives about the provenance of the museum’s objects and journeys to Sweden in a playful and creative exploration. We could observe how the virtual workshop setting supported focused discussions, and allowed zooming, drawing and remixing of digital photographs to facilitate conversation. The workshop participants on-site worked with the museum objects on display to remediate them through photos, drawings, clay modelling, and writing down thoughts and questions about the objects on discussion postcards. The participants’ contributions were included in the virtual collection database (Carlotta), under the same collection as the other museum objects, making the remediation process circular. We argue that object-centred methods enable audience participation in digital media ecosystems both in museums and with other media makers.

The audience’s expectations and experiences from using other media bring them to the digital museum platforms with a willingness to explore, remix and integrate.
Covid-19 Pandemic Coping Strategies in a Complex Landscape of Crisis Communication: A Participatory Study with Disability Organisations in Sweden
Authors: Lundälv Jörgen , Nilsson Elisabet M. , Eriksson Magnus
Published: May 2022

The article challenges the notion that crisis communication is a matter of outreach of a single message communicated as “one voice” from official channels speaking to the public about how to prepare for and manage crisis situations. The Covid-19 pandemic has made it evident that the general public is accessing multiple channels for crisis information while the crisis situation, the rules and knowledge are constantly changing. An array of different voices, facts, (fake) news and recommendations are channeled via public service, social media, national and international media. Most of this content is accessed and shared via digital channels, but also via communities, workplaces, and between friends and families living in the same country or abroad. This article presents insights gained from a qualitative study addressing disabled people whose everyday lives have always been characterized by extraordinary circumstances, and continuously so also during the Covid-19 pandemic. The aim was to create an understanding of disabled people’s crisis-specific media practices and their ways of coping with situations caused by the pandemic. Through a national online survey study and workshops, it explores how disabled people experience the pandemic, and how crisis information flows affect trust between authorities and the disability movements. The study should be read in the light of the Swedish Covid-19 strategy, which put a strong emphasis on the individual’s responsibility and that every citizen is expected to follow the recommendations and take precautionary measures to limit the spread of the virus. This approach requires that both public agencies and citizens are capable of navigating the emerging complex crisis communication landscape and requires them to make responsible decisions and take relevant measures.
Employees’ Satisfaction with Supervisor Communication and Personal Feedback
Authors: Milanović Vesna , Matić Andrea Bučalina , Golubović Jelena
Published: May 2022

The subject of the research in this paper was the examination of satisfaction with the internal communication dimensions that have the strongest correlations with job satisfaction, which are: supervisor communication and personal feedback. Therefore, if employees are satisfied with these communication dimensions, their job satisfaction will be at a satisfactory level. The goal of the research was to determine satisfaction with the observed communication dimensions based on the employees’ attitudes. Managers’ and non-managerial employees’ attitudes towards the observed communication dimensions are presented, also. On the sample of 72 respondents, using descriptive statistics, the results have shown that the employees are not satisfied with the observed dimensions, also, the non-managerial employees are less satisfied than the managerial ones. The results are useful since they provide a description of the observed dimensions and findings of the previous studies, especially the ones which investigated the relationship between satisfaction with the observed communication dimensions and job satisfaction. The results may be useful for (Serbian) managers in the process of managing the observed communication dimensions. The sample size limits the generalizability of the result.
Bioeconomy perception by students of different study programs – study from Slovakia
Authors: Výbošťok Jozef , Navrátilová Lenka , Dobšinská Zuzana , Dúbravská Bianka , Giertliová Blanka , Aláč Patrik , Suja Miroslav , Šálka Jaroslav
Published: May 2022

The paper builds on previous international research done by Masiero et al. (2020). It applies on Slovak national level and expands the previous study with different study programs. The societal transformation towards bioeconomy provides an opportunity for changing current economy and societies into more sustainable ones with mitigation of the environmental pressures at hearts. Such societal transition requires involvement of all stakeholders in bio-economy discussion and decision-making process and studying their perceptions of bioeconomy. Amongst all the stakeholders, future generation is particularly important, as it is important to understand bioeconomy perception by the generation of stakeholders that will manage this area in the near future. For that reason, we focus our attention on students of three bioeconomy related areas at the Technical University in Zvolen (forestry studies, wood processing studies and natural resources management studies). We were able to identify significant differences in bioeconomy perception between analyzed categories. The familiarity with the concept is quite high, as more then two thirds have heard about bioeconomy before the survey was conducted. As the main information sources were selected news, university courses and social media. The study program had a greater impact on perceived importance of forests within bioeconomy than the type of study. Overall, students perceive development of forest-based bioeconomy as favouring sustainable forest management.
The Role of Nature in New England Puritan Theology: The Case of Samuel Willard
Authors: Wolfe Stephen M.
Published: May 2022

This article discusses the role of nature in the theological system of New England minister Samuel Willard (1640-1707). I focus specifically on his account of theological anthropology, the relationship of nature and grace, and the moral (or natural) law, and show how each relates to his views on civil government and civil law. Willard affirmed the natural law, natural religion, and natural worship, and he acknowledged and respected pagan civic virtue and grounded civil order and social relations in nature. Willard’s theological articulations are substantively the same as those found among the ‘Reformed orthodox’ theologians of 17th century Europe, which provides evidence for the thesis that Reformed orthodoxy was a transatlantic movement. His reliance on nature also corrects scholarship on the New England Puritans, which often assumes that they rejected the Christian natural law tradition.
Proposal of a prediction model for prognosis of patients with acute myocardial infarction after percutaneous coronary intervention based on galectin-3 and soluble growth stimulating expressed gene 2 levels
Authors: Zhang Fuxia , Yu Fuchao , Song Songsong , Yang Hongfei , Shao Liangfa , Tong Jiayi
Published: May 2022

Background: To study the correlations of serum galectin-3 (Gal-3) and soluble growth stimulating expressed gene 2 (sST2) levels with prognosis of patients with acute myocardial infarction (AMI) after percutaneous coronary intervention (PCI).

Methods: A total of 112 patients diagnosed from August 2015 to October 2017 were selected. They were followed up for 3 years. Based on major adverse cardiovascular events (MACEs) during follow-up, they were divided into MACE and non-MACE groups. Multivariate logistic regression analysis was performed to explore the independent risk factors for MACEs. A nomogram model was established using the factors and validated. The optimal cut-off values of Gal-3 and sST2 levels were determined by receiver operating characteristic curves. Kaplan-Meier method was used for survival analysis.

Results: MACEs occurred in 78 patients during follow-up. Patients in the MACE group were more often hypertensive, had higher total cholesterol, uric acid, sST2 and Gal-3, and lower left ventricular ejection fraction (LVEF) (P<0.05). CK-MB, sST2, Gal-3 and LVEF were the independent risk factors for MACEs (P<0.05). The nomogram model established with these factors had high accuracy for predicting overall survival, and its concordance index (C-index) was 0.768 (95% confidence interval: 0.692-0.865). The prognosis of the patients with Gal-3 ≥12.57 μg/ mL and sST2 ≥18.56 ng/mL was poorer 3 years after PCI.

Conclusions: The levels of serum Gal-3 and sST2 are the independent risk factors for MACEs in AMI patients following PCI, with high prognostic value.
Comparison of FEM Simulations of Rubber-Metal Mount Element
Authors: Bucha Jozef , Danko Ján , Milesich Tomáš , Nemec Tomáš , Magdolen Ľuboš
Published: May 2022

Increasing of electric vehicles volume brings new challenges in NVH (noise, vibration and harshness) area. Presented paper deals with comparison of simulations of rubber-metal motor mount using finite element method. For the future work it is important to define static characteristics of rubber-metal mounts. It leads to study possibilities of simulations of rubber-metal mount in different software environment. Preparing of computational models are realized in MSC Marc and MSC Nastran. Results from simulations are compared to Abaqus simulation results.
Improving the Efficiency of Grinding Process Using the Rubber-Pasted Grinding Wheel
Authors: Do Duc Trung , Hoang Xuan Thinh , Le Dang Ha
Published: May 2022

This paper studies the efficiency improvement of AISI 4140 steel external cylindrical grinding process. Experiments were carried out with two types of grinding wheels, a conventional and the rubber-pasted grinding wheels. With each type of the wheel, nine experiments were performed. Cooling fluid, spindle speed, feed rate and depth of cut are variables in the experiments. Two outcomes used to evaluate grinding efficiency are surface roughness and material removal rate (MRR). Experimental results demonstrate that the surface roughness achieved in the grinding operation using the rubber-pasted grinding wheels is smaller than using the conventional wheel. The Data Envelopment Analysis-based Ranking (DEAR) method was applied to determine the optimal values of the input parameters for the “minimum” surface roughness and “maximum” MRR in the cases of using each grinding wheel. It is found that the optimization of the input parameters in this circumstance are equal. Several grinding experiments for examining the values of the variables were also performed for both the wheels. The results also confirm that the surface roughness in the grinding process with the rubber wheels is about 19.42% smaller than the conventional wheels.
Predicting the Burnishing Force for Cylindrical Workpieces with Amodified Surface Layer
Authors: Fanidi Omar , Kostryukov Alexandre , Shchedrin Alekcie
Published: May 2022

A mathematical module for predicting and analysing the drawing forces is formed and verified. The process used in the current study is drawing. Geometric parameters of the deformation zone and the “selective transfer phenomenon” are also taken into consideration. The experimental verification is conducted through two tests: In the first test, the experimental blanks are cylindrical rods (steel 45, length 150 mm), and are preliminary turned, and the drawplate made of steel 9xc, are used. Regular micro-relief (RMR) hardens the working surfaces of the drawplate. In the second test, the same conditions are applied except for the samples, which represent solid cylindrical billets made of steel 45 with a complicatedly modified surface layer, including a brass film, regular microgeometry and a “servo-witte” copper film. As a result, in the first experiment, the discrepancies are in the range of -29.1% up to +23%. In the second experiment, the discrepancies are in the range of +1.38% up to +48.9%.
The Correction Factor Taking Into Account the Effect of Mass Transfer on the Heat Transfer Coefficient
Authors: Gužela Štefan , Dzianik František
Published: May 2022

Various factors affect the processes that take place in the devices. Knowledge of these factors is important, especially for technical practice. If these were omitted in the design of the device, the expected changes in the properties of the substances would probably not occur in the device. Different processes occur in the devices, often involving simultaneous heat and mass transfer through the interfacial area. In this case, it is true that the description of the heat transfer cannot be based on ordinary laws. It is necessary to proceed from their corrected forms because, generally, the mass transfer influences the heat transfer. This impact can be taken into account using the correction factor adjusting the commonly reported relationships, as mentioned in this article.
Optimization of Laser Beam Welding Parameters for 90/10 Cupronickel Alloy Welds Using Taguchi Method
Authors: Maddili Praveena Chakravarthy , Dakarapu Santha Rao
Published: May 2022

This study is to identify the most important control elements that will result in improve the tensile strength of Laser Beam Welded Cu-Ni 90/10 alloy joints. The different laser welding process parameters and levels were used for joining of Cu-Ni alloy. The process parameters like Laser Power (LP), Shielding Gas (argon) (SG), Focal Position (FP), & Welding Speed (WS) were chosen in the experimental study. The welding was carried on 4mm thick plate as per Taguchi’s experimental design. The mechanical properties were evaluated and microstructural observations were carried out. It was discovered that highest tensile strength of 234 MPa & hardness of 83 Hv were obtained which has 90 % and 87 % of the base material. The most influential optimal process parameters were determined using S/N analysis and the percentage contribution of each process parameter was estimated using ANOVA. It was found that laser power was influential parameter with a 64 % contribution in obtaining highest strength of laser welded joints. The experimental values and the results of the confirmation experiments were in good agreement.
Mathematical Model and Optimization Algorithm By Mass of Tracked Load-Carrier/Prime Mover MT-LB Transmission
Authors: Ustynenko Oleksandr , Bondarenko Oleksij , Klochkov Illia , Protasov Roman , Bošanský Miroslav , Andrienko Sergij
Published: May 2022

Solving the problem of optimization for transmission load-carrier/prime mover MT-LB improves the mass characteristics of the machine. Mathematical model of optimization was constructed, namely: optimization objective function was built; variables planning are defined; a system of constraints was constructed. The solution is based on probing the parameter space, where points of the LPτ-sequence are used as test points in a single multidimensional cube. Also, the algorithm for optimal design of the transmission has been developed.
Analysis on the Impact of Business Support Measures Regarding the Continuity of Economic Activity in Pandemic Context
Authors: Voinea Cristina -Maria , State Violeta , Coman Dan Marius
Published: May 2022

The economic reality, under the impact of the pandemic crisis caused by the SARS-CoV-2 virus, has acquired a dimension difficult to anticipate, characterized by an extremely high degree of uncertainty. In order to reduce the negative impact of the uncertainty of the pandemic on economic activity, the state has been forced to intervene by adopting measures to support the business environment, both immediately, in the very short term and in the long term. The challenges for entrepreneurs were innumerable, the business management being under the dominant influence of some disturbing factors coming from the external environment of the economic entities, respectively the epidemiological context from a certain moment. Through this study we aim to make an analysis of the impact, in terms of financial performance, that the support measures adopted by the state had on the decisions of entrepreneurs regarding the continuity of their business. The case study highlights, through a comparative approach, the period before the pandemic versus the pandemic period, the influences on the performance and results recorded by an economic entity in the field of HORECA, one of the most affected areas.
COVID 19 Pandemic and the Reaction of the Supreme Audit Institutions. Lessons Learned at the End of the Pandemic
Authors: Lazăr Pleşa Teodora Nicoleta , Popescu Constanța , Pleşa Iliodor Tiberiu
Published: May 2022

The article aims to analyze the reaction of the supreme audit institutions during the two years in which the COVID 19 pandemic affected all the states of the world, given the particularly important role that these institutions play in terms of their specific external public audit activity of public resources.

At the same time, this paper aims to analyze the main lessons learned by INTOSAI, as the umbrella organization of the supreme audit institutions, as well as by the other SAIs individually, at the end of the pandemic, as a unique experience in the last century.
Evolution and Professional Revolution for Accounting Professionals
Authors: Boharu Mircea Mihaela-Raluca , Savu Andreea-Cristina , Diana Bolcu Leliana , Nicolic Deian
Published: May 2022

The role of the professional accountant has evolved with the development of accounting science. During this process, the professional accountant should not limit his training to only university courses, as his performance is linked to the continuous development of his skills and knowledge in the field. The current economic context outlines the necessity for a new type of professional accountant, one who is constantly up to date with legislative changes, always ready to implement aid schemes offered by the state, always able to support the business environment affected by the crisis. Considering all these aspects, the objectives of this article are directed towards answering the following questions: Can professional development and coordination by professional bodies prepare the accounting profession for the future? What are the conditions for professional evolution and professional revolution, considering extreme changes? Does personal responsibility for lifelong learning and career development represent necessary conditions for professional evolution? How can the professional evolution of the accountant be supported by professional associations? The methodology of the research is based on approaching the problem both theoretically and practically by studying the literature and analysing the legislation and the application of international standards in the field. A possible result of this article would be the estimation of the extent to which a coordinated professional development should be based on professional training, which triggers the challenges that professional accountants must face, and how professional bodies could intervene in the processes by updating the regulations, determining, thus, successful coordination within uncertain future scenarios.
A Public Health Perspective on the Necessity of Regulation for the Video Gaming Industry
Authors:   McGill University, Duffy Sophie
Published: May 2022

Video gaming is a widely participated and normalized activity in most global jurisdictions with its engagement continuing to increase. Currently, global gaming operators remain largely self-regulated with minimal government regulation.
Bosques, deforestación, medio ambiente y actores sociales durante el porfiriato en México
Authors: Pérez Talavera Victor Manuel
Published: May 2022

El siguiente trabajo tiene por objetivo analizar el desarrollo de la política forestal durante el periodo porfirista (1876-1911), en el cual además se aborda el impulso que se le dio a la desecación de ciénegas y lagunas en diversas regiones del país, como parte de las acciones de acaparamiento de tierras que se impulsó para la extensión de la agricultura. Del mismo modo, se aborda a dos figuras importantes del tema forestal en México: Mariano Bárcena y Miguel Ángel de Quevedo, intelectuales que destacaron por sus aportaciones en la conservación de los bosques en el país. Esta propuesta se desarrolla a través de la historia ambiental, tomando como hilo conductor las decisiones institucionales relativas al manejo y a la protección de los recursos forestales que en su momento implementó el Gobierno mexicano
Problemáticas de abastecimiento y salubridad hídrica en Cali durante la mitad del siglo XX
Authors: Perafán Cabrera Aceneth , Restrepo Jiménez Lina María
Published: May 2022

Las condiciones ambientales que identifican el contexto en el que se desenvuelve una sociedad son un factor significativo en su relación directa con la salud. Este artículo tiene como propósito analizar algunos de los principales aspectos relacionados con la salubridad en la ciudad de Santiago de Cali (Valle del Cauca) durante las primeras décadas del siglo XX, momento en el cual se produjo la incursión de diversas enfermedades que afectaron gravemente la salud de la población en un marco de gran pobreza, inadecuados hábitos alimenticios e higiénicos, escaso nivel educativo y una precaria gestión de los recursos y los servicios sanitarios, que dieron origen a una elevada mortalidad.
Bajo los lineamientos teóricos de la historia ambiental, el uso de fuentes primarias, secundarias y material cartográfico, se muestran los procesos de deterioro y transformación de los ecosistemas hídricos y la problemática de salubridad en la ciudad, en los cuales se destaca el agua como el principal vector trasmisor de enfermedades. Se describen, además, los esfuerzos emprendidos por las autoridades y el gremio médico en procura de solventar las diversas necesidades en materia de atención médica y hospitalaria.
Germán Palacio Castañeda (2018). Territorios Improbables. Historias y Ambientes. Bogotá: Editorial Magisterio [351 páginas].
Authors: Córdoba Guzmán Paulo Tirso
Published: May 2022

Además de contribuir a la historiografía colombiana con un profundo análisis del período republicano 1850-1930, el libro de Germán Palacio también constituye una invitación a incorporar elementos ambientales dentro de las investigaciones históricas. Pero ¿qué sentido tiene incorporar elementos ambientales a ese tipo de investigaciones? ¿Por qué es importante contar historias desde una perspectiva ambiental? ¿Qué se logra con ese tipo de iniciativas intelectuales?
An Industrial View on Enzymes for the Cleavage of Cephalosporin C
Authors: Riethorst Waander , Reichert Arno
Published: May 2022

The enzymatic cleavage of cephalosporin C (CephC) into 7-aminocephalosporanic acid (7-ACA) and deacetyl-7-aminocephalosporanic acid (HACA), both key intermediates for cephalosporin antibiotics, has now been commercialized on an industrial scale. This article illustrates economic, technical, and regulatory aspects of the process, with special focus on the enzymes involved.Due to the compensation for low operational stability by low costs of preparation, cell immobilization of Trigonopsis variabilis seems an economically attractive and technically feasible way to prepare D-amino acid oxidase (EC 1.4.3.3). However, the application of immobilized cells is restricted to large-volume products, since it involves extensive development and characterization work. For glutaryl-7-ACA acylase (EC 3.5.1.3), expressed in Escherichia coli, isolation and immobilization of the enzyme on a commercial carrier seems more attractive from a regulatory point of view. The immobilized enzyme shows very high operational stability, which may compensate for the costs of the carrier. Despite its lower stability, cephalosporin G acetylesterase (EC 3.1.1.41), expressed in E. coli, was also immobilized on a commercial carrier for regulatory reasons. Moreover, extensive development of immobilized whole cells seemed economically not acceptable for this low-volume product. A mathematical model for the enzymatic cleavage showed limitations of a combined application of two biocatalysts in a stirred tank reactor, e.g., in terms of product yield.
Biotechnology in the Fine-Chemicals Industry: Cyclic Amino Acids by Enantioselective Biocatalysis
Authors: Petersen Michael , Sauter Martin
Published: May 2022

Enantiomerically pure cyclic amino acids are of increasing interest for the life-science industry. To meet this demand, Lonza has developed biotransformation processes with emphasis on the integration of chemistry and biocatalysis for the production of homochiral proline, piperidine-2-carboxylic acid and piperazine-2-carboxylic acid, and valuable derivatives of these compounds. The processes are designed for use on industrial scale; they have been optimised with respect to availability and cost of starting materials and biocatalyst, productivity of the process and a feasible product isolation procedure. Because of the extraordinarily high enantioselectivity of the enzymes, the (R)- and the (S)-enantiomers of the unnatural cyclic amino acids, which are both of commercial interest, can be produced in a single reaction. The examples presented demonstrate the benefit from interdisciplinary research for the production of fine chemicals by the combination of chemistry and biotechnology.
Progresses Towards the Advanced Computational Chemistry of Increasingly Complex Systems
Authors: Weber Jacques
Published: May 2022

At the dawn of a new millennium, the perspectives offered by computational chemistry are reviewed with a strong emphasis placed on methodological developments and prospective applications of quantum chemistry. In particular, current progress in both density functional theory and linear scaling algorithms is such that accurate and realistic modeling of increasingly complex systems comprising, e.g. 103–104 atoms and up to 105 basis functions will be within the reach of standard computers in a couple of years.
Nanotechnology and Model Catalysis: The Use of Photolithography for Creating Active Surfaces
Authors: Prins Roel , Schildenberger Markus , Bonetti Yargo C. , Gobrecht Jens
Published: May 2022

New and very stable model catalysts have been developed. Two types of samples on oxidized 4-inch wafers were produced using processes that are generally employed in semiconductor device technology. A single wafer exhibits 109 to 1010 active sites on an otherwise flat silicon oxide surface. Sputter etching of a number of bilayers (Pd/SiO2), stacked on an oxidized Si wafer surface resulted in billions of isolated towers, consisting of disks of active metal layers, separated by inert substrate material. A second system was produced by etching pits into a heavily oxidized 4-inch Si wafer. Active material was deposited into the pits by e-beam evaporation or spin-coating of precursor solutions. The topography and chemical composition, and the changes induced by the reaction conditions applied, including stability and chemical behavior of the nanostructured systems, were investigated by means of AFM, SEM, temperature-programmed methods and XPS.