With the huge advancement of nanotechnology over past years, devices are shrinking into micro-scale, even nano-scale. Additionally, Internet nano-things (IoNTs) generally regarded as ultimate formation current sensor networks and development nanonetworks would be great help to its fulfilment, which ubiquitous with numerous applications in all domains life. However, communication between such is still an open problem. Body-centric believed play essential role practical application IoNTs....

Graph neural networks (GNNs) have exhibited superior performance in various classification tasks on graph-structured data. However, they encounter the potential vulnerability from link stealing attacks, which can infer presence of a between two nodes via measuring similarity its incident nodes' prediction vectors produced by GNN model. Such attacks pose severe security and privacy threats to training graph used models. In this work, we propose novel solution, called Link Disguise (GRID),...

Reconfigurable intelligent surface (RIS) is able to enhance the capacity of wireless communication systems with low overhead. Extremely large (XL)-RIS-aided millimeter-wave (mmWave) has become a promising key technique for future 6-th Generation (6G) systems. The performance gain brought in by XL-RIS relies on accurate channel state information (CSI). However, estimation requires huge training overhead and high computational complexity due XL number passive elements at RIS. Moreover, unknown...

This paper focuses on the modelling of communication channel noise inside human tissues at THz band (0.1-10THz). A novel model is put forward based study physical mechanism in medium, which takes into account both radiation medium and molecular absorption from transmitted signal. The derivation general concepts detailed paper. results show that power spectral density scale several micrometres acceptable levels value tends to decrease with increase distance frequency. In addition, also...

The envisioned dense nano-network inside the human body at terahertz (THz) frequency suffers a communication performance degradation among nano-devices. reason for this limitation is not only path loss and molecular absorption noise, but also presence of multi-user interference caused by utilising any scheme, such as time spread ON-OFF keying (TS-OOK). In paper, an model TS-OOK scheme THz channel has been developed probability distribution signal-to-interference-plus-noise ratio (SINR)...

The Internet of Remote Things (IoRT) supported by low-Earth orbit (LEO) satellites is becoming indispensable for remote sensing and it will play an important role in the forthcoming sixth-generation (6G) communication network. In exploring its applications mining smart grid, etc., found that implementation IoRT faces challenges, including limited energy supplies, high-mobility, security vulnerabilities. To address these we propose employing collaborative LEO to enable secure green IoRT. By...

In this paper, the measurement of collagen gels and dermal equivalents (DEs) with three kinds fibroblast cell densities concentrations is performed, respectively, using terahertz time-domain spectroscopy (THz-TDS) in transmission mode. With objective to reduce thickness uncertainty, an algorithm extract material parameters sample thin samples simultaneously employed. The statistical mean standard deviation refractive indexes absorption coefficients a THz band from 0.2 1.5 are presented. It...

With the huge advancement of nanotechnology over past years, devices are shrinking into micro-scale, even nano-scale. Additionally, Internet nano-things (IoNTs) generally regarded as ultimate formation current sensor networks and development nanonetworks would be great help to its fulfilment, which ubiquitous with numerous applications in all domains life. However, communication between such is still an open problem. Body-centric believed play essential role practical application IoNTs....

In recent years, many companies have entered the space field by successfully employing miniaturized satellites to provide numerous kinds of services public or governmental sectors. This is because exhibit inherent advantages, such as easy manufacturing and low launching cost. However, their use limited on-board power. this study, novel simultaneous-information power-transfer (SSIPT) schemes are presented overcome limitation, which can efficiently extend lifetime further reduce costs. Two...

In this paper, a two-section folded waveguide of Terahertz (THz) extended interaction oscillator (EIO) is presented, which studied by the help particle-in-cell (PIC) simulation. The output power and operation frequency are studied.

The Sarah Mildred Long Bridge, an 854-m (2,804-ft) double-deck truss bridge in Portsmouth, New Hampshire, was struck by a 144-m (473-ft) cargo ship on April 1, 2013. After days of visual inspection and assessment, it found that the main damage, significant bending vertical diagonal member, required replacement impacted members. According to Hampshire Department Transportation, repair cost $2.5 million. Before after repairs, authors collected vibration data bridge. This rare, valuable set...

The technology age of terahertz (THz) frequency is coming, with tremendous features and astonishing applications in various fields science. Using THz time domain spectroscopy, we demonstrate experimentally, for the first time, fingerprint absorption peaks complex dielectric response trends a 0.1–3 waveband, on intentionally synthesized processed chemical vapor deposition polycrystalline single-crystal diamond films systematic quality difference. two signatures within band, which atomic...

A preliminary investigation is carried out on the artificial human skin tissues with and without metastatic melanomas using Terahertz Time Domain Spectroscopy (THz-TDS). Both refractive indexes absorption coefficients of are higher than normal samples over entire frequency range between 0.2 THz to 1.6 THz. The reason that tumour cells degrade contraction fibroblasts causing more water content in malignant tissues. This study quantifies impact optical parameters tissue can help techniques...

In this study, the wave localization in a disordered periodic bridge (DPB) with pile–soil–water–structure (PSWS) coupling is investigated For simplicity, each span of assumed to be composed pile foundation, pier, two composite beams and three linking springs. To determine compliances foundations, pile–soil–water (PSW) interaction simulated by boundary element method (BEM). terms piles transfer matrices piers beams, spans are derived, which obtained. Using Wolf's algorithm obtained, factor...

The phase behavior and critical parameters of the CO2 (1) + ethanol (2) dichloromethane (3) ternary system were determined, density mixtures was measured in both subcritical supercritical regions system. isothermal compressibility (KT) under some typical conditions calculated using data. data also Peng−Robinson equation state (PR EOS). results showed that at fixed composition temperature is very sensitive to pressure as approaches critical, bubble, dew pressures (both are close point...

We demonstrate a deep residual network with transfer learning strategy for automatic terahertz (THz) recognition of the hidden defects in fiber reinforced polymer (FRP) composites small-scale training data. The performance high accuracy, precision, sensitivity and specificity indicate effectiveness proposed method automatically identifying different THz nondestructive applications.