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1

Factors affecting urban people’s intention to use buses in Vietnam

Thai Nguyen Hong, Quan Thach Minh

Transport Problems

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2023

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T. 18, z. 1

89--101

EN

Despite strong development in Vietnam’s major cities, buses only contribute to city traffic. Bus services in Vietnamese towns do not yet meet passengers’ current needs and are not popular with passengers, especially in terms of time and convenience. This article analyzes the factors affecting urban people’s intention to use buses in Vietnam and, on that basis, makes recommendations to the authorities in cities to enhance the attractiveness of bus usage. Twenty-seven factors have been identified as affecting the need to travel by bus. The survey results show that there are still many barriers to attracting passengers using bus services in urban metropolitan areas. Therefore, urban governments in Vietnam need to adjust the current bus route network to suit the needs of the people, especially students, to increase its coverage.

2

Characterization of multi-scale pore structure and analysis of adsorption capacity influencing factors in Zhaotong shallow shale gas reservoir

Zhang Jiayi, Zhang Liehui, Hu Shuyong, Qiu Tingting

Acta Geophysica

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2023

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Vol. 71, no. 5

2181--2196

EN

In order to explore the reservoir characteristics of shallow shale gas reservoir in Zhaotong and its differences with other shale gas blocks in Sichuan Basin, the pore structure of Zhaotong shale gas reservoir was comprehensively studied by various means, including X -ray diffraction, gas adsorption (CO2, N2), NMR, and field emission-scanning electron microscopy. In addition, the adsorption capacity of samples in this area was measured by volume method and the main controlling factors were analyzed. The results show that the shale reservoir in the Zhaotong demonstration area is dominated by clay and quartz minerals, with an average content of 23.1% and 34.3%, respectively. Pore-size distribution is concentrated in the range of 0.5–1000 nm, with micropore and mesopore as the main body. Scanning electron microscopy shows that the reservoir space types are mainly organic pores, intergranular pores, intragranular pores, and microfractures. Among them, organic pores are the most developed and most of them appear in large area network structures with good connectivity. The results of the methane isothermal adsorption test show that the adsorption capacity of shale in the Zhaotong area is positively correlated with TOC content, specific surface area, and micropore volume (D≤10nm), but poorly correlated with total pore volume. Due to the influence of mineral types and genesis, the adsorption capacity of shale in this area is negatively correlated with clay content and poorly correlated with quartz content. Through data comparison and analysis, the adsorption capacity of shale in the Zhaotong area is higher than that in the Fuling and Changning–Weiyuan areas. Additionally, due to the influence of mineral genesis, the changing trend of shale adsorption capacity with quartz content is also different in different regions.

3

Climate-friendly transport – analysing structural relationships

Kolanović Ines, Čišić Dragan, Jugović Alen, Smojver Željko

Scientific Journal of Gdynia Maritime University

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2022

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nr 121

7--19

EN

The objective of this study is to assess the impacts of technology, and social, economic, and legal effects on climate-friendly transport. A model is created to identify the relationships between important factors that are creating the concept of climate-friendly transport. Structural equation modelling was used to identify the relationships between 21 measured influencing factors and four latent constructs: technology, legislative, and socioeconomic factors, and green transportation as abstract concepts used to group them. The relationships between all of the measured factors and constructs are calculated indicating the correlations, regression, and covariance between all elements of the study. The relationships between the abstract concepts and factors are calculated. The results of this research will improve insight into all environmentally friendly transport-influencing factors and concepts.

4

Experimental research on the volatilization and condensation of ammonium bisulfate as SCR byproduct

Jiao Kunling, Ma Shuangchen, Chen Xiangyang, Liu Jiaming, Qiao Lin

Polish Journal of Chemical Technology

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2022

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Vol. 24, nr 4

30--38

EN

In this paper, the research progress of ammonium bisulfate (ABS) volatilization in coal-fired power plants the SCR denitrification process was reviewed. Combination with self-made experiments, SEM, flue gas analyzer and TG-DTG curves of ABS and ion chromatography. The volatilization and condensation characteristics of ABS were investigated carefully. Results show that as the temperature increased by 50 °C, the ABS/AS volatilization rate increased by an order of magnitude. The decomposition process of ABS should have a two-step reaction. The reaction in the initial volatilization stage is ABS dehydration turned into (NH4)2S2O7. The reaction in the rapid volatilization stage is (NH4)2S2O7 decomposed into NH3, N2, SO2 and H2O. There is an inter-section in the reac-tion temperature range (especially 300 °C) between the two-step reaction. This research provides an experimental basis for temperature control of ABS to avoid air pre-heater fouling.

5

Research on influencing factors of emergency power support for voltage source converter-based multi-terminal high-voltage direct current transmission system

Li Congshan, Zhen Zikai, Sheng Tingyu, Liu Yan, Zhong Pu, Zhang Xiaowei

Archives of Electrical Engineering

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2022

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Vol. 71, nr 4

881--894

EN

Voltage source converter-based multi-terminal high-voltage direct current (VSCMTDC) transmission system can realize a multi-point power supply, multi-drop power receiving, and mutual coordination between the converter stations to ensure the reliability of the transmission. Based on the PSCAD/EMTDC platform, a five-terminal DC transmission system model is established. According to the fast power regulation capability and overload capacity of theVSC-MTDC power transmission system, an analysis of additional emergency power support for a transmission system under large disturbance conditions was carried out. A new control strategy for emergency power support that introduces its basic principle is proposed in this paper. It uses the short-term overload capability of the DC system. By changing the power reserve of the converter station and the electrical distance between the converter stations, the influence of the power reserve and the electrical distance on the emergency power supply guarantee is analyzed the stability of the system is improved, thereby improving the sudden change of power caused by voltage fluctuations, and the feasibility of the control module is verified by PSCAD simulation. The simulation results show that when the system power supply suddenly changes, the converter stations at a short distance and large power reserve has a better effect on emergency power supply protection. A comparative study of the active power support of a single converter station and multiple converter stations is carried out. The research results show that the use of emergency power support in the DC transmission system has a good effect on maintaining the stability of the inter-connection system and the reliability of the power supply.

6

Analysis of some factors affecting business performance from non-financial aspects at enterprises in Nam Dinh province

Nguyen Anh Thi Lan, Nguyen Linh Van, Truong Hang Thanh, Bui Thuy Thi

Annals of Computer Science and Information Systems

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2021

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Vol. 28

19--27

EN

Business performance of enterprises is evaluated by many different models, most of which use financial measures. However, traditional financial measures cannot provide information for strategy development because they skip customer satisfaction and quality of products and services… Therefore, non-financial measures for business performance is gaining a special advantage, in which the Balanced Scorecard model (BSC) with customers, internal processes and development training as non-financial measures has been widely recognized by many companies and highly regarded by many researchers for its role in the strategic management of enterprises. This article aims to examine the factors affecting business performance from non-financial aspects (customers, internal processes and development training) of enterprises in Nam Dinh province. The study used the quantitative research method and SPSS 26 data processing software, and is based on the estimated linear regression model with 520 feedbacks from enterprises in various fields of operation in Nam Dinh province in 2020. The research results show that the factors affecting business performance in terms of non-financial aspects are ranked in the following order: (1) Use of resources, (2) Market orientation, (3) Information technology (IT), (4) Local policies, (5) Capital accessibility and usage, and (6) State policies. On that basis, the article proposes some suitable solutions for managers to improve the business performance of enterprises in Nam Dinh province.

7

Study on the preparation of copper red glaze and parameters affecting its colour

Luo Minhua, Cheng Liping, Hu Xingle, Liang Huayin, Xiao Zhuohao, Shi Huimin, Tang Chenxi

Materiały Ceramiczne

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2019

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T. 71, nr 4

397--407

EN

Copper red glaze is one of the traditional famous glazes in China, its colour effects depend on many combined factors. In this paper, the technological parameters in the preparation process were studied by experiments, and the suitable preparation process of copper red glaze was determined. The preparation process is as follows: the use of kaolin, quartz and feldspar as the main raw materials, copper oxide as a colourant, batching, ball milling (material:ball:water = 1:1:1, 15 minutes), sieving (250 meshes), glaze impregnation (15 s - 30 s). The firing process is as follows: heating up in an oxidizing atmosphere for 2 hours to the atmosphere conversion temperature, conversion to a strong reduction temperature - slow increase to 1200 °C, conversion to a weak reduction - slow increase to the highest firing temperature, holding for 10 minutes, ceasing the firing, furnace cooling. The main factors affecting the colour of copper red glaze were studied. The experimental results show that not only the content of copper ion in the glaze and the firing atmosphere, but also the content of potassium feldspar, kaolin and quartz has a significant influence on the colour of the copper red glaze. The chromaticity values of the samples were measured and the internal mechanism of influence was preliminarily discussed based on the results of SEM and EDS analysis.

PL

Czerwone szkliwo miedziowe jest jednym z tradycyjnych słynnych szkliw w Chinach, a jego efekty kolorystyczne zależą od wielu różnych czynników. W tym artykule parametry technologiczne w procesie przygotowania zostały zbadane doświadczalnie i określono odpowiedni proces przygotowania szkliwa miedziowego. Proces przygotowania jest następujący: zastosowanie kaolinu, kwarcu i skalenia jako głównych surowców, tlenku miedzi jako barwnika, dozowanie, mielenie w młynie kulowym (materiał: kula: woda = 1: 1: 1, 15 minut), przesiewanie ( 250 oczek), impregnacja szkliwem (15 s - 30 s). Proces wypalania jest następujący: podgrzewanie w atmosferze utleniającej przez 2 godziny do temperatury konwersji atmosfery, konwersja do silnej temperatury redukcji - powolny wzrost do 1200 °C, konwersja do słabej redukcji - powolny wzrost do najwyższej temperatury wypalania, wytrzymanie przez 10 minut, zaprzestanie wypalania, chłodzenie pieca. Przebadano główne czynniki wpływające na kolor czerwonego szkliwa miedziowego. Wyniki eksperymentów pokazują, że nie tylko zawartość jonu miedziowego w szkliwie i atmosferze wypalania, ale także zawartość skalenia potasowego, kaolinu i kwarcu ma znaczący wpływ na kolor czerwonego szkliwa miedziowego. Zmierzono wartości chromatyczności próbek i wstępnie omówiono wewnętrzny mechanizm wpływu, opierając się na wynikach analizy SEM i EDS.

8

Rozwój spoteczno-gospodarczy głównym uwarunkowaniem bezpieczeństwa ruchu drogowego

Jamroz K.

Transport Miejski i Regionalny

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2012

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nr 4

9-12

PL

Wykorzystując wyniki studiów literatury i prac własnych, zaproponowano wskaźnik śmiertelności demograficznejw wypadkach drogowych WSD jako miarę poziomu bezpieczeństwa ruchu drogowego. Zgromadzone zbiory dostępnych danych pozwoliły na zidentyfikowanie grupy najbardziej istotnych czynników wpływających na bezpieczeństwo ruchu drogowego na obszarze kraju. Opracowano model zmian tego wskaźnika WSD z wykorzystaniem funkcji potęgowo-wykładniczej uwzględniającej najbardziej istotne czynniki. Do budowy tej funkcji zastosowano kilkanaście zmiennych niezależnych reprezentujących charakterystyki przestrzenne, demograficzne, ekonomiczne, społeczne, motoryzacyjne, infrastrukturalne i transportowe analizowanych krajów, z których najbardziej istotnym okazał się poziom rozwoju społeczno-gospodarczego. Przedstawiona w artykule funkcja opisująca zmiany wskaźnika WSD może być wykorzystana do wyjaśniania aktualnego stanu bezpieczeństwa ruchu drogowego w poszczególnych krajach oraz jego prognoz.

EN

Based on a study of literature and own work the road accident demographic mortality rate (WSD) was developed as a measure of road safety. Sets of available data helped to identify groups of the most critical factors which affect a country's level of road safety. A model was developed to show how the WSD rate changes using the power-exponential function which includes the most relevant factors. The function is built from morę than ten independent variables representing spatial, demographic, economic, social, motorization, infrastructural and transport characteristics of the countries under analysis. It was established that the level of human-economic development is the most critical factor. The article presents a function which describes how the WSD rate changes. It can be used to explain a country's current level of road safety and its forecasts.

9

Analysis of fretting fatigue

Upul F.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2005

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z. 84

93-109

EN

Fretting induced failure is commonly observed in industrial components that are in contact and are subjected to small oscillatory movements. Microcracks nucleated by fretting may grow rapidly under dynamic loading to catastrophic failure and fretting fatigue is a classic case of multiaxial fatigue which results in a considerable reduction in fatigue strength. This lecture outlines; basic introduction, influencing factors and a fracture mechanics concept that have been developed for the analysis of fretting crack growth and fatigue life prediction.