Communications in physics

In this study, we propose a NOMA communication model combined with linear array antennas for the purpose of enhancing physical layer security. We introduce a model of 4 nodes: transmitter node S, receiver node D1, receiver node D2, eavesdropping node E.

10p viling 11-10-2024 0 0   Download

The extension of life expectancy has led to the expansion of comorbidities and declination of functional ability, which have consequences on mental, physical and social well-being of the elderly. Hence, comprehensive understanding factors influencing instrumental activities of daily living (IADL) will guide future health strategies to improve the quality of life for the elderly. To access the prevalence of IADL limitation and its related factors among community-dwelling elderly in Hue city.

8p vifaye 20-09-2024 1 1   Download

During menopause transitions, fluctuate hormone levels make menopausal women susceptible to mental and physical disorders that affect their quality of life. Research on menopauserelated problems, especially among rural women, are currently insufficient. With that sense, our objective is to investigate signs of dysfunction and quality of life (QOL) in menopausal women in Vietnam, 2021.

7p visunati 23-08-2024 1 1   Download

This thesis contributes to a better understanding of the relationship between residential energy efficiency and health. The thesis argues that residential energy efficiency improvements are complex interventions in complex socio‐technical systems.

765p runthenight04 02-02-2023 14 5   Download

In the light of Dynamic Systems Theory, which defines language development as an interaction of various factors in a system, a quantitative research was executed to examine the effects of physical movement in classrooms on students’ self-confidence (SC) and willingness to communicate (WTC) in English.

15p meyerowitz 25-12-2021 9 0   Download

In recent years, a raising problem encountered by high school students in general and rural ones in particular is extremely bad speaking skill. This leads to a serious subsequence is that quality of students is low as well as learning and teaching have to face to many difficulties due to the reason that speaking skill is an essential instrument when learning communication in any another language. The problems were related to speaking materials, students’ physical limits, and supporting equipment.

56p nguathienthan12 18-05-2021 48 4   Download

A study on species composition and density of polychaete (Polychaeta) was investigated in mangrove eco-system, Da Loc commune, Hau Loc District, Thanh Hoa province. Samples were collected in April, July, and November, 2010, from cross-sections of Len estuary and mangrove forests. A total of 15 polychaete species, belonging to 11 genera, 9 families and two groups of settlers (Sedentaria) and mobile (Errantia), were recorded in the study areas.

8p tamynhan9 02-12-2020 14 2   Download

The physical and proximate analysis of the fuel used during cooking was determined. The properties viz., moisture content fixed carbon, volatile matter, ash content was determined and the physical properties like bulk densities, resistance to water penetration and the shatter resistance of agro residue briquettes were determined to know the suitability of fuel for cook stove.

18p nguaconbaynhay6 24-06-2020 18 1   Download

The study "Assessment of health educational outcomes about dyslipidemia using a network of community health workers in Hue City" was conducted to assess the behavioral changes in prevention and treatment of dyslipidemia and evaluate the prevalence of dyslipidemia decreasing in people aged 20 years or older in Hue city through community health education.

13p thiendiadaodien_9 04-03-2019 26 3   Download

The Denver test has been applied in community in Vietnam. But in Hue city, it was just used to assess and follow the psychomotor development for children with health problems, not in community. The objectives of study are to assess the physical, psychomotor development of infants in Hue City in 2009-2010 and to identify factors in the relation with physical, psychomotor development of infants.

13p thiendiadaodien_9 04-03-2019 13 0   Download

The ripplon modes of two segregated Bose-Einstein condensates (BECs) confined by one and two hard walls are respectively studied by means of the hydrodynamic approach within the Gross-Pitaevskii (GP) theory. For the system at rest we find that due to the spatial restriction the dispersion relations are of the form ω ∼ k 2 in low momentum limit for both cases, while for the system in motion parallel to the interface the dispersion relations for both cases are ω ∼ k at low momentum limit and, furthermore, the system becomes unstable.

8p thuyliebe 08-10-2018 26 0   Download

" lập trình lapview" hướng dẫn xây dựng các ứng dụng dựa trên những phần cứng chính hãng như compactrio, usb 6008/6009, pci7250 và những phần cứng giá thành thấp như hocdelam usb-9001, hocdelam usb 9090.

127p vinhpham011096 09-10-2018 126 11   Download

After completing this chapter, students will be able to: Explain the role of Physical layer protocols and services in supporting communication across data networks, describe the role of signals used to represent bits as a frame as the frame is transported across the local media, describe the purpose of Physical layer signaling and encoding as they are used in networks.

87p youcanletgo_01 04-01-2016 70 6   Download

In chapter 4, students will be able to: Explain how physical layer protocols and services support communications across data networks, build a simple network using the appropriate, explain the role of the data link layer in supporting communications across data networks, compare media access control techniques and logical topologies used in networks.

66p youcanletgo_01 29-12-2015 69 4   Download

In traditional switched LANs, the physical topology is closely related to the logical topology. • Generally, workstations must be grouped by their physical proximity to a switch. • To communicate among LANs, each segment must have a separate port on the backbone device or a connection to a common backbone.

46p vanmanh1008 21-05-2013 41 3   Download

The human species' use of began with the conversion of natural resources into simple tools. The prehistorical discovery of the ability to control fire increased the available sources of food and the invention of the wheel helped humans in travelling in and controlling their environment. Recent technological developments, including the printing press, the telephone, and the Internet, have lessened physical barriers to communication and allowed humans to interact freely on a global scale.

100p louisxlll18107 29-01-2013 47 5   Download

Although allostery plays a central role in driving protein–DNA interac-tions, the physical basis of such cooperative behavior remains poorly understood. In the present study, using isothermal titration calorimetry in conjunction with site-directed mutagenesis, we provide evidence that an intricate network of energetically-coupled residues within the basic regions of the Jun-Fos heterodimeric transcription factor accounts for its allosteric binding to DNA.

15p cosis54 05-01-2013 34 3   Download

3D models are getting more and more attention from the research community. The application potential of 3D models is enormous, especially in creating virtual environments. In Vietnam National University - Hanoi, there is a need for a test-bed 3D environment for research in virtual reality and advance learning techniques. This need raises a very good motivation for the research of 3D reconstruction. In this paper, we present our work toward the creating of a 3D model of Vietnam National University - Hanoi automatically from image sequences.

11p tuanlocmuido 19-12-2012 60 3   Download

The project uses a dual approach which focuses on both the physical / scientific dimension of aquaculture and the educational / training dimension of aquaculture extension program development. This dual approach enables the improvement of aquaculture practises resulting from Dimension 1 to be consolidated and disseminated more broadly through provincial aquaculture communities per medium of the activities of Dimension 2. The project supports capacity building in both aquaculture management and aquaculture extension (community education)....

14p tam_xuan 02-03-2012 50 5   Download

This diagram illustrates the Physical layer (Layer 1) of the OSI model. The Physical layer is responsible for the ultimate transmission of data over network communications media. It operates with data in the form of bits that are sent from the Physical layer of the sending (source) device and received at the Physical layer of the destination device. Ethernet cabling, Token Ring network technology and SCSI all function at the Physical layer of the OSI model. Hubs and other repeaters are standard network devices that function at the Physical layer.

54p thanhtq00103 08-06-2011 115 20   Download