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Results 671-680 of 698 (Search time: 0.004 seconds).
    • Neutrino mass and dark matter from an approximate B − L symmetry
    Authors: Duong Van, Loi; Phung Van, Dong; Dang Van, Soa;  Advisor: -;  Co-Author: - (2020)

    We argue that neutrino mass and dark matter can arise from an approximate B − L symmetry. This idea can be realized in a minimal setup of the flipped 3-3-1 model, which discriminates lepton families while keeping universal quark families and uses only two scalar triplets in order for symmetry breaking and mass generation. This proposal contains naturally an approximate non-Abelian B − L symmetry which consequently leads to an approximate matter parity. The approximate symmetries produce small neutrino masses in terms of type II and III seesaws and may make dark matter long lived. Additionally, dark matter candidate is either unified with the Higgs doublet by gauge symmetry or acted as an inert multiplet. The Peccei-Quinn symmetry is discussed. The gauge and scalar sectors are exactl...
    • On the spectrum-efficiency of QoS-aware protection in elastic optical networks
    Authors: Đào, Thanh Hải; Dao, Thanh Hai;  Advisor: -;  Co-Author: - (2020)

    Elastic optical networks technologies feature several benefits including higher spectral efficiency, system capacity and therefore have been widely viewed as the promising paradigm for next-generation optical transport networks. Dedicated path protection for elastic optical networks has been of ever-increasing importance in the era of information society thanks to its near-immediate recovery speed and remarkably simple operations in guaranteeing the connectivity of information flows. Inspired by the observation that the today premium network traffic traveling in fiber links accounts for roughly 25% of total traffic and the best-effort traffic constitutes the remaining, we propose a new design for elastic optical networks with dedicated path protection tailoring to the actual traffic...
    • Fabrication and characteristics of Zn1–xSnxO nanorod/ITO composite photocatalytic films
    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 độ pha tạp Sn cao hơn 3%. Với sự tương đồng về diện tích bề mặt hiệu quả, sự đóng góp của Sn trong v...
    • Large strain response under low field in SrTiO3 modified Bi1/2Na1/2TiO3–LaFeO3piezoceramics
    Authors: Dinh, Thi Hinh;  Advisor: -;  Co-Author: - (2020)

    To further reduce the driving field of Bi1/2Na1/2TiO3-based piezoceramics to meet the requirements for real actuators applications, SrTiO3 modified 0.99Bi1/2Na1/2TiO3-0.01LaFeO3 piezoceramics were synthesized. The 0.79Bi1/2Na1/2TiO3-0.01LaFeO3-0.20SrTiO3 provides the large electrostrains of 405 pm/V at 1.7 kV/mm and 565 pm/V at 2 kV/mm, which are triable values for actuator applications in non-textured Bi1/2Na1/2TiO3-based piezoceramics.