Abstract As a low‐grade sustainable heat source, the human body provides great driving force for converting into electric energy using thermoelectric materials, which can effectively power wearable electronics. However, low conversion efficiency is not sufficient to achieve autonomy in operation of devices. Herein, bacterial cellulose (BC) organogel‐based thermoelectrochemical cells (TECs) are designed and prepared with K 4 Fe(CN) 6 /K 3 as redox couple. The addition propylene glycol...

In this article, we study an intelligent reflecting surface (IRS)-assisted system where a multi-antenna base station (BS) serves single-antenna user with the help of multi-element IRS in presence interference generated by BS serving its own user. The signal and links via are modeled Rician fading. To reduce phase adjustment cost, adopt quasi-static shift design shifts do not change instantaneous channel state information (CSI). We investigate two cases CSI at BSs, namely, case statistical...

Abstract Utilizing the thermogalvanic effect, flexible thermoelectric materials present a compelling avenue for converting heat into electricity, especially in context of wearable electronics. However, prolonged usage is hampered by limitation imposed on device's operational time due to evaporation moisture. Deep eutectic solvents (DESs) offer promising solution low‐moisture gel fabrication. In this study, bacterial cellulose (BC)/polyacrylic acid (PAA)/guanidinium chloride (GdmCl)...

Low-grade heat exists ubiquitously in the environment, and gel-state thermogalvanic cells (GTCs) can directly convert thermal energy into electricity by a redox reaction. However, their low ionic conductivity poor mechanical properties are still insufficient for potential applications. Here, we designed bacterial cellulose (BC) nanofiber-macromolecular entanglement network to balance GTC's thermopower properties. Therefore, BC-GTC shows Seebeck coefficient of 3.84 mV K-1, an 108.5 mS cm-1,...

Tooth enamel is composed of arrayed fluorapatite (FAP) or hydroxyapatite nanorods modified with Mg-rich amorphous layers. Although it known that Mg2+ plays an important role in the formation enamel, there limited research on regulatory synthesis enamel-like materials. Therefore, we focus behavior fabrication biomimetic mineralized structural In present study, adopt a bioprocess-inspired room-temperature mineralization technique to synthesize multilayered array columnar FAP/polymer...

In this paper, we study an intelligent reflecting surface (IRS)-assisted system where a multi-antenna base station (BS) serves single-antenna user with the help of multi-element IRS in presence interference generated by BS serving its own user. The signal and links via are modeled Rician fading. To reduce phase adjustment cost, adopt quasi-static shift design shifts do not change instantaneous channel state information (CSI). Maximum Ratio Transmission (MRT) is adopted at two BSs to enhance...

Existing works on grant-free access, proposed to support massive machine-type communication (mMTC) for the Internet of Things (IoT), mainly concentrate narrow band systems under flat fading. In contrast, this paper investigates access in a wideband system frequency-selective First, we present an orthogonal frequency division multiplexing (OFDM)-based scheme. Then, propose two different but equivalent models received pilot signal. Specifically, one directly signal actual devices, whereas...

The impacts of channel estimation errors, inter-cell interference, phase adjustment cost, and computation cost on an intelligent reflecting surface (IRS)-assisted system are severe in practice but have been ignored for simplicity most existing works. In this paper, we investigate a multi-antenna base station (BS) serving single-antenna user with the help multi-element IRS multi-cell network interference. We consider imperfect state information (CSI) at BS, i.e., CSIT, focus robust...

In order to mitigate the mutual interference between ultra-wideband (UWB) impulse radio and other existing wireless systems, a novel adaptive interference-avoiding UWB pulse, in context of appealing cognitive radio, is presented based on radial basis function neural networks. Theoretical implementation architecture for pulse generator addressed. Transmission performance presence narrowband including tone comprehensively analyzed. The can adaptively change spectrum shape signals according...

To reduce the risk of high‐temperature geothermal environment in deep mine exploitation, an innovative method for cooling stopes by backfill slurry with ice particles has been focused on. In this paper, aiming at effect particles, experimental device including stope region and ice‐filled filling was established temperature measurement simulation study. The results showed had a significant on region. Orthogonal design experiment range analysis methods were applied studying influencing...

The propagations of 60 GHz millimeter-wave system, which occupies an enormous operation bandwidth, are always known to be intensively dispersive. This may, in practice, pose great challenges the estimation channel state information. In this article, we investigated a promising compressed sensing (CS) algorithm and its practical applications estimations emerging communications. By fully considering particular characteristics further utilizing another kind sparsity, i.e., specific block...

Interference alignment with limited feedback can achieve the wireless channel's maximum multiplexing gain a error-free low-rate channel state information (CSI) channel. Most interference schemes are designed under assumption of block-fading model in which channels remain static for period but vary independently from block to block. This ignores temporal correlation MIMO channels, be used analyze overhead CSI feedback. In this paper, we consider over time-variant Average and precoders bit...

In conventional approach, the bit error probability (BEP) expressions of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$M$ </tex-math></inline-formula> -ary phase-shift keying (MPSK) signals over additive white Gaussian noise (AWGN) channel are derived by averaging probabilities for all bits MPSK symbol. The closed-form BEP AWGN can also be using weighted conditional symbol (SEP) expressions, which has...

An energy storage thermo-battery from a thermocell was obtained by utilizing the thermo-responsive hydrophobic interaction between methyl cellulose and I 3 − (Δ C ), thermoelectric properties were further enhanced confinement of BC S ).

Device activity detection and channel estimation for grant-free massive access under frequency-selective fading have unfortunately been an outstanding problem. This paper aims to address the challenge. Specifically, we present orthogo-nal frequency division multiplexing (OFDM)-based scheme a wideband system with one M- antenna base station (BS), <tex>$N$</tex> single-antenna Internet of Things (IoT) devices, <tex>$P$</tex> taps. We obtain two different but equivalent models received pilot...

Device activity detection and channel estimation for massive grant-free access under frequency-selective fading have unfortunately been an outstanding problem. This paper aims to address the challenge. Specifically, we present orthogonal frequency division multiplexing (OFDM)-based scheme a wideband system with one M-antenna base station (BS), N single-antenna Internet of Things (IoT) devices, P taps. We obtain two different but equivalent models received pilot signals Rayleigh fading. Based...

Abstract Drastically lowering the usage of platinum while enhancing activity and stability toward oxygen reduction is critical to promoting energy conversion efficiency in metal‐air batteries. Herein, an efficient catalyst was rationally designed by constructing ultrasmall Pt Pt/MoC dual active sites co‐anchored on nitrogen‐doped carbon. Owing synergistic effect sites, optimized Pt‐MoC@NC delivers superior with ultralow loading. Especially, shows robust methanol tolerance. As cathodic...

In this paper, we study an intelligent reflecting surface (IRS)-assisted system where a multi-antenna base station (BS) serves single-antenna user with the help of multi-element IRS in presence interference generated by BS serving its own user. The signal and links via are modeled Rician fading. To reduce phase adjustment cost, adopt quasi-static shift design shifts do not change instantaneous channel state information (CSI). We investigate two cases CSI at BSs, namely, case statistical...

Existing works on grant-free access, proposed to support massive machine-type communication (mMTC) for the Internet of things (IoT), mainly concentrate narrow band systems under flat fading. However, little is known about access wideband frequency-selective This paper investigates in a system First, we present an orthogonal frequency division multiplexing (OFDM)-based scheme. Then, propose two different but equivalent models received pilot signal, which are essential designing various device...

The impacts of channel estimation errors, inter-cell interference, phase adjustment cost, and computation cost on an intelligent reflecting surface (IRS)-assisted system are severe in practice but have been ignored for simplicity most existing works. In this paper, we investigate a multi-antenna base station (BS) serving single-antenna user with the help multi-element IRS presence errors interference. We consider imperfect state information (CSI) at BS, i.e., CSIT, focus robust optimization...