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2022 ◽  
Vol 19 (4) ◽  
pp. 82-91
Author(s):  
I. O. Poleshkina

The transport accessibility of the Arctic zone is of strategic interest for Russia from the point of view of the possibility of mineral exploration and ensuring further systemic development of this part of the national territory.The objective of the study is to carry out a spatial analysis of the transport system of the Republic of Sakha (Yakutia), to identify its topological properties and restrictions that impede providing sufficient logistics services. Based on the method of spatial analysis, the conducted study of the state of the transport system of the Republic of Sakha (Yakutia) allowed to assess transport provision within its territory for three types of transportation: transport provision of internal regional (local) transportation, transport provision of accessibility (entry and exit) of the territory of the region, and transport provision of transit transportation across the region.The study showed that air transport is the main mode for passenger transportation, while seasonal water and winter road transportation are the main modes of freight haulage.The regions of Yakutia with access to traffic arteries and isolated from them have been identified. Calculations based on the Engel’s coefficient allowed to proceed with a mathematical assessment of the transport system of the region, which indicates its insufficient development due to the lack of year-round transportation routes in the areas of the Far North and the Arctic zone. The transport infrastructure of this part of the region are represented by seasonal winter roads and waterways, which prevents from assessing their general year-round potential. For its assessment, it is necessary to consider seasonal availability of each individual section of the network. 


Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 87
Author(s):  
Tiancheng Luo ◽  
Yan Liu ◽  
Yang Zou ◽  
Jie Zhou ◽  
Wenjuan Liu ◽  
...  

Radio frequency (RF) filters with multiple passbands can meet the needs of miniaturization and integration for 5G communications. This paper reports a dual-mode Lamb wave resonator (DLWR) and a dual-passband filter based on DLWRs. The DLWR consists of a piezoelectric film and two interdigital electrode (IDT) arrays with different thicknesses, which leads to the coexistence of two main modes in the resonator. The resonance frequencies of the two modes can be adjusted separately by changing the thicknesses of the IDTs, which greatly satisfies the requirements of the dual-passband filter. Four DLWRs with different electrode configurations are designed, and the influences of the periodic length and thicknesses of the IDTs on the performance of the DLWR are studied. When the thickness of the piezoelectric layer is 0.75 μm and the two thicknesses of the IDTs are 0.1 μm and 0.3 μm, the resonance frequency of the second main mode is 1.27 GHz higher than the resonance frequency of the first main mode in the DLWR. Furthermore, a dual-passband filter based on the proposed DLWRs is demonstrated with an insertion loss less than 1 dB and a band rejection of about 15 dB. Moreover, two passbands at 2.45 GHz and 3.88 GHz with bandwidths of 66 MHz and 112 MHz, respectively, are achieved. The presented DLWR shows a potential application that can be used to obtain RF filters with adjustable dual passbands.


2021 ◽  
Vol 5 (12) ◽  
pp. 24-31
Author(s):  
Xiuying Wu ◽  
Lingjia Chen

In view of the current situation that offline teaching is the main mode of teaching Java Programming in higher vocational schools, this paper introduces the online and offline hybrid teaching method and expounds it from the aspects of blended learning design, teaching organization, and implementation. At the same time, combined with the characteristics of blended learning, this paper proposes that under the new mode, teachers should actively change the form of teaching and research, the teaching mode, and the role of teachers, take students as the center, and build an independent and effective classroom.


2021 ◽  
Vol 5 ◽  
Author(s):  
Tani Khara ◽  
Christopher Riedy ◽  
Matthew B. Ruby

This qualitative study used social practice theory to explore how meat-eating practices are changing in contemporary urban Australia, drawing on a sample of Sydney residents aged 23–45 years. The research used an iterative study design and an inductive analysis approach. Semi-structured face-to-face in-depth interviews were the main mode of data collection, supplemented by observations in places such as markets and local neighborhoods. Research participants explained that the role of meat in their diet has changed in response to shifting conventions and social infrastructures. They have reduced consumption of red meat in favor of meats considered healthier or more ethical. Key factors driving the change include exposure to alternative eating practices brought about through changes in political policy and the advent of globalization. Changing discourses of masculinity and the move toward embracing more fluid representations of gender have, in turn, changed meanings in relation to the meat-eating man and a meat-heavy diet. Rising environmental and health consciousness, and concerns for animal welfare have also contributed to dietary changes. While several participants claimed to have increased their consumption of plant-based foods, meat still continues to maintain a significant presence within their diets. Many participants expressed interest in cutting back further on meat consumption and adopting more plant-based foods but they also identified several challenges—e.g., limited access to plant-based ingredients and recipes, negative meanings associated with vegetarian and vegan diets, and a lack of competence in relation to preparing and consuming appetizing meals using plant-based foods.


2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Abhimanyu Tharayil ◽  
R. Rajakumari ◽  
Miran Mozetic ◽  
Gregor Primc ◽  
Sabu Thomas

There is an unprecedented concern regarding the viral strain SARS-CoV-2 and especially its respiratory disease more commonly known as COVID-19. SARS-CoV-2 virus has the ability to survive on different surfaces for extended periods, ranging from days up to months. The new infectious properties of SARS-CoV-2 vary depending on the properties of fomite surfaces. In this review, we summarize the risk factors involved in the indirect transmission pathways of SARS-CoV-2 strains on fomite surfaces. The main mode of indirect transmission is the contamination of porous and non-porous inanimate surfaces such as textile surfaces that include clothes and most importantly personal protective equipment like personal protective equipment kits, masks, etc. In the second part of the review, we highlight materials and processes that can actively reduce the SARS-CoV-2 surface contamination pattern and the associated transmission routes. The review also focuses on some general methodologies for designing advanced and effective antiviral surfaces by physical and chemical modifications, viral inhibitors, etc.


2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Jun Jie Wu

AbstractFor ultrafiltration, and membrane filtration more generally, the quantitative determination of the modes of fouling remains a subject of great interest. Herein an integral method for determining the modes from a time series of volumetric flux $$J\left(t\right)$$ J t is given and illustrated with previously published filtration data of bergamot juice (Ruby-Figueroa et al (J Membr Sci 524:108-116, 2017)). The integral method of fouling analysis has the potential to become the cornerstone of a robust empirical process. In addition to determining, in a clear-cut manner, the point at which there is a switch from one mode to another, the robust methodology yields characteristic $$J\left(t\right)$$ J t equation for each mode that are an excellent fit to the data. The emphasis is upon the creation of a robust methodology which is best viewed as being a semi-empirical method that is indicative of the modes of fouling. For the example chosen, the initial 4 L/m2 generates some pore blocking after which the main mode of fouling is cake build-up. The variation of overall resistance with time is also informative and analysis of this series was used to check the result for the initial phase of fouling as determined from the time series of volumetric flux. A comparison against the ARIMA (Autoregressive integrated moving average) method, which has never been previously undertaken, is given herein. The integral method of fouling analysis was found to be superior, in part because of the quality of fit to the data and in part because it enables one to establish whether the initial fouling is different in character from the subsequent fouling. Having this information can improve membrane selection and overall membrane filtration performance.


2021 ◽  
pp. 195-211
Author(s):  
Jesper Larsson ◽  
Eva-Lotta Päiviö Sjaunja

AbstractIn this chapter, we stress the fact that households’ incomes were complex and came together by a mix of activities. To fully understand how households managed their livelihoods, activities other than fishing, hunting, and reindeer herding also need to be considered. Diversification was an active and systematic choice for these households, not something they did occasionally. Some of these activities were for subsistence, some for exchange. What households could produce was to a large extent determined by their main mode of production, which in turn was linked to rights or access to resources. The more engaged users were in reindeer pastoralism, the less time they had to spend on other activities, and the more they traded.


2021 ◽  
Author(s):  
Da Chen ◽  
Ye Liu ◽  
Yonglin Yu

Abstract A theoretical model based on the mode expansion of the traveling wave equations is developed to investigate the mode interaction processes behind the photon-photon resonance (PPR) effect in distributed Bragg reflector (DBR) lasers. With dual-mode rate equations, strength of mode interactions is characterized by the cross power and the coupling factors, which arise from the non-orthogonality of the main mode and the PPR mode. Small signal analysis and large-signal dynamics are performed, and results indicate that the cross power is a key contributor to the PPR effect.


2021 ◽  
Vol 20 (2) ◽  
pp. 119-146
Author(s):  
J. Ranaweera ◽  
M. Zanin ◽  
D. Weaving ◽  
C. Withanage ◽  
G. Roe

Abstract Typical player management processes focus on managing an athlete’s physical, physiological, psychological, technical and tactical preparation and performance. Current literature illustrates limited attempts to optimize such processes in sports. Therefore, this study aimed to analyze the application of Business Process Management (BPM) in healthcare (a service industry resembling sports) and formulate a model to optimize data driven player management processes in professional sports. A systematic review, adhering to PRISMA framework was conducted on articles extracted from seven databases, focused on using BPM to digitally optimize patient related healthcare processes. Literature reviews by authors was the main mode of healthcare process identification for BPM interventions. Interviews with process owners followed by process modelling were common modes of process discovery. Stakeholder and value-based analysis highlighted potential optimization areas. In most articles, details on process redesign strategies were not explicitly provided. New digital system developments and implementation of Business Process Management Systems were common. Optimized processes were evaluated using usability assessments and pre-post statistical analysis of key process performance indicators. However, the scientific rigor of most experiments designed for such latter evaluations were suboptimal. From the findings, a stepwise approach to optimize data driven player management processes in professional sports has been proposed.


Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 7836
Author(s):  
Andrey A. Zhirnov ◽  
Konstantin V. Stepanov ◽  
Stanislav G. Sazonkin ◽  
Tatyana V. Choban ◽  
Kirill I. Koshelev ◽  
...  

In this study, an experimental study of the burning rate of solid fuel in a model solid propellant rocket motor (SRM) E-5-0 was conducted using a non-invasive control method with fiber-optic sensors (FOSs). Three sensors based on the Mach–Zehnder interferometer (MZI), fixed on the SRM E-5-0, recorded the vibration signal during the entire cycle of solid fuel burning. The results showed that, when using MZI sensors, the non-invasive control of solid fuel burnout is made possible both by recording the time of arrival of the combustion front to the sensor and by analyzing the peaks on the spectrogram of the recorded FOS signal. The main mode of acoustic vibrations of the chamber of the model SRM is longitudinal, and it changes with time, depending on the chamber length. Longitudinal modes of the combustion chamber were detected by MZI only after the combustion front passed its fixing point, and the microphone was unable to register them at all. The results showed that the combustion rate was practically constant after the first second, which was confirmed by the graph of the pressure versus time at the nozzle exit.


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