Model-based safety assessment for conceptual aircraft systems design

Traditional system technology modeling in conceptual aircraft design mainly relies on empirical knowledge and methods derived from conventional systems, for which valid system architecture designs are known. Since these systems have been proven valid especially from a safety perspective, detailed system safety analyses are usually not necessary. For unconventional systems and innovative technologies, on contrary, new architectures have to be designed and system safety has, therefore, to be taken into account. Therefore, the application of model-based safety assessment (MBSA) for designing system architectures in conceptual aircraft design studies is proposed. A MBSA approach based on a Simulink architecture model is presented which is tailored for use in conceptual design studies. It is applied to the cryocooling system of a hybrid-electric powertrain architecture from an already-published study. The original architecture as well as possible architecture alternatives are investigated. As a result, a safer architecture version with lower number of components can be proposed. The application example indicates that using MBSA in conceptual design benefits the latter by providing insights into safety properties of the system and by pointing out architecture safety weaknesses. This could result in safer, thus more realistic system architectures.

Analysis of clothing elements reflecting fashion trends in the collection of fashion shows

The aim of the work is to study fashion trends, to establish a set of elements through which changes are expressed in models (samples) of collections of fashion shows of clothes, and how these changes are introduced into mass production and are repeated over time. The theoretical significance of the work lies in the development of a methodology for studying clothing samples, identifying fashion trends and making forecasts. The results obtained can be used in training for the formation of competencies among specialists in the field of fashion technology, modeling and clothing design, at industry enterprises for the development of promising collections. The proposed technique was tested, elements of models and materials were identified, the use and combination of which ensures the relative novelty and integrity of the collections, forms a promising trend, which is further implemented in the mass production of clothing.

Public Procurement as an Economic Policy Tool

The paper provides the rationale for using the public contractual system of the Russian Federation as a mechanism of a proactive economic policy. A number of works are analyzed that consider expenditure stimulation through a public contractual system as the main regulatory tool, for instance, in building national innovative systems, advancing research and technology, modeling the structure of the economy as well as solving social problems. An empirical analysis of the role of the Russian contractual system is given in view of its impact upon development of the regional economies in 2012–2019. Regular significant relations between the scope of financing public procurement within the contractual system of the Russian Federation and adequate own funds in the regional budgets are confirmed. The trends in elasticity coefficients characterizing correlations between the scope of financing of public and municipal procurement within the Russian public contractual system and particular tax groups in consolidated budgets of the subjects of the Russian Federation in 2012–2019 indicate economic appropriateness of increased procurement costs in terms of simultaneously providing own funds to the budgets. A positive influence of public and municipal procurement upon the level of employment and innovative activity of entities is shown, verifying, therefore, the potential of the Russian contractual system to support social and innovative policy, which is consistent with international evaluations. Conclusions are reached on the expediency of employing the budget and contractual system cumulatively as a proactive mechanism of economic policy to achieve efficient economic orders.

Preservice Teacher Perspectives on Learning with Technology: Modeling Vulnerability and Embracing Innovation

This mixed methods study examined preservice teacher perspectives on the impact of using untethered lecture capture (ULC) as an instructional technology in a teacher preparation course, both on learning experiences as students and confidence using technology as teachers. Results found statistically significant (p < .05) increases in confidence using technology as a teaching tool. Additionally, Darling-Hammond et al.'s (2018) Teacher Preparation for Deeper Learning framework was utilized to analyze qualitative data to explore the impact of ULC on preservice teacher learning. Challenges and recommendations for effective implementation of ULC, based on participant feedback, are provided. This study contributes to research on using technology in teacher preparation programs to enhance the teaching and learning process for preservice educators and is grounded in the TPACK model (Mistra & Koehler, 2009).

Background, Applications and Issues of the Experimental Designs for Mixture in the Food Sector

Background: Mixtures play a key role in Food Science and Technology. For studying them, rational approaches should be used. In detail, the experimental designs for mixtures are useful tools for studying the effects of ingredients/components in formulations. Results: Food Science and Technology is the fourth category among the total records considered in this review. The applications span from food formulation to the composition of modified atmosphere, shelf-life improvement and bioactives extraction. However, the majority of the studies regards few products and ingredients. Simplex-lattice and simplex-centroid designs are the most common used, although some optimal designs, such as the D-optimal, have also interesting applications. Finally, some issues are highlighted, which basically regard the interpretation of the models coefficients and the lack of model validation. Conclusion: In the last decade, mixture designs have been fairly used in the field of Food Science and Technology. Modeling the response(s) allows researchers to achieve a global knowledge of the system under study within the defined experimental domain. However, the majority of application has regarded limited classes of products, and thus an increase in the spectrum of applications is desired.

Determination of the errors first component in the tolerance field structure of the inter-transition size for the transformation of geometric elements in the structure of the initial blanks

To determine the errors first component in the tolerance field structure of the inter-transition size the knowledge base of the production technological preparation by seven levels of its basic objects of functionally different types is used. The task is solved in the working space of working machines, in the structure of which two technological schemes are built: for basing the initial blanks in working machines and for basing form elements in working machines and their geometric forming on working machines. Technological schemes for basing the initial blanks into working machines in the general case have a significant impact on the geometric and dimensional errors (the considered component) of the shape elements to be converted in the technological schemes for basing form elements into working machines and their geometric forming on working machines. It is shown that the determination of the errors first component in the tolerance field structure of the inter-junction size must be carried out by means of specialized intelligent control and measuring systems, embedding them in the structure of working machines. Determination of the first component in the tolerance field structure of the inter-transition size is relevant, has scientific novelty and practical significance. Keywords technological preparation of production; cutting processing; system analysis; information technology; modeling solutions; systems technology