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  • Authors: Nguyen T, Dung; Dang Tran, Chien; Trinh Duc, Thien; Duong Anh, Tuan; Pham Duc, Thang; Nguyen Dang, Ninh; Nguyen Dinh, Lam;  Advisor: -;  Co-Author: - (2020)

    Các màng quang xúc tác hỗn hợp Zn1 − xSnxO NR / ITO được chế tạo bằng phương pháp thủy nhiệt. Nồng độ Sn dopant trong nanorods Zn1 − xSnxO (NR) thay đổi từ 0% đến 7%. Các đặc điểm hình thái cấu trúc và bề mặt của màng quang xúc tác hỗn hợp Zn1 − xSnxO NR / ITO đã được nghiên cứu bằng nhiễu xạ tia X (XRD) và kính hiển vi điện tử quét (SEM), tương ứng. Ngoài ra, tính chất xúc tác quang của vật liệu tổng hợp được đánh giá bằng tốc độ phân hủy của dung dịch nước Rhodamine-B dưới bức xạ tia UV. Kết quả SEM chỉ ra rằng, với nồng độ Sn dopant ngày càng tăng trong Zn1 S xSnxO NR / ITO, diện tích bề mặt hiệu quả đã bị suy giảm do chức năng phân rã theo hàm mũ và mức giảm không đáng kể vì nồng ...
  • Authors: Duc-Nam Nguyen; Van-Tuan Nguyen; Ich-Hung Dam; Van-Huong Vu;  Advisor: -;  Co-Author: - (2022)

    A large number of piezoelectric polymers have been studied and applied widely recently and become an attractive topic in both material science and applied engineering fields. Piezoelectric polymers such as Poly(vinyl fluoride) and Poly(γ-benzyl, L-glutamate) fabricated in nanofibers have shown impressive properties in the aspect of low weight, high flexibility and high piezoelectricity. One of the major parameters influencing to the piezoelectricity of electrospun fibers is the orientation. This paper reviews the contribution of fiber orientation to the piezoelectricity properties and the technique to manipulate the orientation. The research group introduces for the first time a fully...
  • Authors: Nguyen, Duc Nam; Nguyen, Van Tuan; Dam, Ich Hung; Vu, Van Huong;  Advisor: -;  Co-Author: - (2022)

    A large number of piezoelectric polymers have been studied and applied widely recently and become an attractive topic in both material science and applied engineering fields. Piezoelectric polymers such as Poly(vinyl fluoride) and Poly(γ-benzyl, L-glutamate) fabricated in nanofibers have shown impressive properties in the aspect of low weight, high flexibility and high piezoelectricity. One of the major parameters influencing to the piezoelectricity of electrospun fibers is the orientation. This paper reviews the contribution of fiber orientation to the piezoelectricity properties and the technique to manipulate the orientation. The research group introduces for the first time a fully...
  • Authors: Phuoc, Phan Hong;  Advisor: Hong, Le Thi; Thang, Nguyen Tat; Hanh, Nguyen Hong; Hung, Chu Manh; Duy, Nguyen Van; Hieu, Nguyen Van; Hoa, Nguyen Duc;  Co-Author: - (2021)

    In the current work, we report the on-chip fabrication of a low-temperature H2S sensor based on p-type Co3O4 nanofibers (NFs) using the electrospinning method. The FESEM images show the typical spider-net like morphologies of synthesized Co3O4 NFs with an average diameter of 90 nm formed on the comb-like electrodes. The EDX data indicate the presence of Co and O elements in the NFs. The XRD analysis results confirm the formation of single-phase cubic spinel nanocrystalline structures (Fd3 m) for the synthesized Co3O4 NFs. The Raman results are in agreement with the XRD data through the presence of five typical vibration modes of the nanocrystalline Co3O4. The gas sensing properties of...
  • Authors: Hua, Huo; YaLi, Yu; ZhongHua, Liu;  Advisor: -;  Co-Author: - (2022)

    A single network model can’t extract more complex and rich effective features. Meanwhile, the network structure is usually huge, and there are many parameters and consume more space resources, etc. Therefore, the combination of multiple network models to extract complementary features has attracted extensive attention. In order to solve the problems existing in the prior art that the network model can’t extract high spatial depth features, redundant network structure parameters, and weak generalization ability, this paper adopts two models of Xception module and inverted residual structure to build the neural network. Based on this, a face expression recognition method based on improv...
  • Authors: Määttänen, Pentti;  Advisor: -;  Co-Author: - (2022)

    According to David Hume values do not belong to the world of facts and cannot be derived from facts. However, Hume’s argument is based on questionable presumptions. His conception of experience as sense perception is erroneous. On contemporary standards it is simply false because sense organs are not channels that passively receive inputs from the world. It is too narrow as it does not take the role of action into account. Further, Hume’s argument is based on the dichotomy between external and internal. Mind is strictly separated from the external world of facts. This entails that experiences, perceptions and ideas do not belong to the world of facts. Causality and values cannot be li...
  • Authors: Pythagoras N., Petratos; Alessio, Faccia;  Advisor: -;  Co-Author: - (2023)

    Fake news, misinformation and disinformation have significantly increased over the past years, and they have a profound effect on societies and supply chains. This paper examines the relationship of information risks with supply chain disruptions and proposes blockchain applications and strategies to mitigate and manage them. We critically review the literature of SCRM and SCRES and find that information flows and risks are relatively attracting less attention. We contribute by suggesting that information integrates other flows, processes and operations, and it is an overarching theme that is essential in every part of the supply chain. Based on related studies we create a theoretical...
  • Authors: Stefano, Ghinoi; Riccardo De, Vita; Bodo, Steiner;  Advisor: -;  Co-Author: - (2023)

    Knowledge networks in regional clusters are fundamental to support innovation and local development. Within clusters, family firms are key in creating business opportunities and supporting the establishment of inter-organizational networks. Yet, their role within regional clusters for knowledge transfers is still not well understood, especially in comparison with non-family firms. This paper applies Exponential Random Graph Models (ERGMs) to network data collected from the Parabiago cluster, one of the most important Italian footwear clusters, to contribute to a better understanding of the network strategies of family firms. We identify distinct network strategies associated with the ...
  • Authors: Andrea, Stübner; Svenja, Jarchow;  Advisor: -;  Co-Author: - (2023)

    This study investigates how family continuation, namely family tradition and succession intention, alter the socially responsible behavior of small and medium sized (SME) family firms. Using a unique dataset, we have conducted multiple regressions on survey data from German family SMEs and show a statistically and economically significant increase in Corporate Social Responsibility (CSR) alongside the planning of family succession. However, when analyzing the different facets of CSR, we have found strong variances: While succession intention goes along with an increased community, market, and supply chain engagement this is not the case for CSR directed towards employees, or the envir...
  • Authors: Jiamu, Sun; Massimiliano Matteo, Pellegrini; Marina, Dabić;  Advisor: -;  Co-Author: - (2023)

    Sluggish market demand can deteriorate the financial situation of a company and affect a shareholder’s decision to adopt environmental, social, and governance criteria (ESG). According to the socioemotional wealth theory, family firms place significant emphasis on sustainable development and long-term orientation, but this emphasis can be either internally or externally driven according to the type of involvement chosen by the owning family. Therefore, this study uses listed family firms to explore the relationship between different types of family involvement (i.e., family ownership and control, the influence of market competition, and the institutionalisation level of the environmen...
  • Authors: Vuong, Quan-Hoang;  Advisor: Phu Pham; Nguyen, My-Hien; Ngo, Cong-Thang; Tran, Phuong-Mai; Khuc, Quy Van;  Co-Author: - (2021)

    The first Sustainable Development Goals (SDGs) of The United Nations aims to “end poverty in all its forms everywhere”. Its seven associated targets aim, among others, to eradicate extreme poverty for all people everywhere. In Vietnam, poverty eradication in ethnic minorities and mountainous areas are among the top priorities. This study aims to learn about farmers’ livelihoods associated with perceived difficulties in Chau Thai Commune, Nghe An Province, a rural mountainous area in Vietnam. A random sampling technique and a face-to-face interview method were employed to conduct a field survey in the region in 2018. The dataset collected from 215 households shows that Chau Thai Commun...