Nitrite (NO2–) accumulation caused by nitrite-oxidizing bacteria (NOB) inhibition in nitrification is a double-edged sword, i.e., disaster aquatic environments but hope for innovating nitrogen removal technology wastewater treatment. However, little information available regarding the molecular mechanism of NOB at cellular level. Herein, we investigate response on NO2– established side-stream free ammonia treatment unit nitrifying reactor using integrated metagenomics and metaproteomics....

Single-band red upconversion emission of Er³⁺ has been successfully achieved in Yb³⁺/Er³⁺ codoped KMgF₃ nanocrystals <italic>via</italic> a nonequivalent substitution strategy.

This paper studies a novel design of user pairing and resource allocation in simultaneous wireless information power transfer (SWIPT)-enabled cooperative non-orthogonal multiple access (NOMA) system with coexisting power-splitting (PS) time-switching (TS) users. In this system, near NOMA users (NUs) that are close to source can assist the communications between far (FUs) using energy harvested by either PS or TS strategy. The aims maximize sum-rate optimizing NUs FUs as well performing...

This paper investigates secure offloading for a wireless powered mobile edge computing (MEC) system. Specifically, an energy-constrained user is first charged by power beacon (PB) via transfer (WPT) and then leverages the harvested energy to offload its computation tasks MEC server in presence of multiple eavesdroppers. To enhance security offloading, we propose novel physical layer security-assisted scheme, which PB can also play role cooperative jammer transmitting jamming signals...

Mobile edge computing (MEC) enables the caching of various services close to users, thereby reducing service delay for emerging applications. However, realizing efficient and secure computation offloading is challenging due limited storage capacity MEC servers security issue arising from open nature wireless channels. In this letter, we investigate a network with an eavesdropper, where server caches programs required task execution. Moreover, propose cooperative jamming-assisted scheme...

This paper studies a joint design of resource allocation and task offloading in wireless powered mobile edge computing network involving different types computation tasks. To deal with diverse tasks, we explore mixed-offloading paradigm to support the coexistence partial binary modes. Specifically, devices harvest energy from an access point (AP) via power transfer (WPT) utilize harvested execute their tasks using or offloading. Based on practical non-linear harvesting model, residual...

Tunable broadband white upconversion (UC) luminescence has been demonstrated in Yb3+/Tm3+/Mn2+ tri-doped KZnF3 nanocrystals from the excitation of a 976 nm laser diode (LD). The light is composed three sharp band peaks at 480, 650 and 700 nm, originating UC emissions Tm3+ ions, one broad centered 585 exchange-coupled Yb3+–Mn2+ dimers. effects concentration, pump power temperature on properties KZnF3:Yb3+,Tm3+,Mn2+ have investigated. By changing Mn2+/Tm3+ content ratio, various colors can be...

This correspondence studies resource allocation for a wireless-powered relay network, where hybrid with constant energy supply assists an energy-constrained source to send confidential information destination in the presence of eavesdropper. We propose novel transmission protocol termed charge-then-cooperate support secure communications this network. Specifically, charges transfer phase; then it forwards from and concurrently injects jamming signals combat eavesdropping. aim maximize...

In order to enhance the acoustical performance of a traditional straight-path automobile muffler, multi-chamber muffler having reverse paths is presented.Here, composed two internally parallel/extended tubes and one extended outlet.In addition, prevent noise transmission from muffler's casing, shell also lined with sound absorbing material.Because geometry an automotive complicated, using analytic method predict difficult; therefore, COMSOL, finite element analysis software, adopted estimate...

Non-orthogonal multiple access (NOMA) and energy-harvesting (EH) relay have been envisioned as promising technologies in Narrowband Internet of Things (NB-IoT) networks to efficiently improve the spectral-energy efficiency massive connectivity devices. However, successive interference cancellation (SIC) ordering NOMA has become a bottleneck affecting performance uplink transmission NB-IoT networks. Also, while using NOMA, data rate based fairness across devices cannot be ensured due...

The orthogonal frequency-division multiplexing (OFDM) is widely used in modern radio communications because of its efficient spectrum utilization. As we know, the adaptive modulation can efficiently improve utilization OFDM systems, comparison with non-adaptive modulation. For this, design a learning-driven automatic recognition (AMR) receiver for system this paper. AMR composed robust channel estimation neural network (RCE-NET), (MR-NET) and decoding (DE-NET). Specifically, RCE-NET...

A reactive muffler has been widely used in depressing venting noise emitted from industrial plants. As can be seen a previous study, perforated/ non-perforated tube inserted inside chamber will produce huge loss of sound transmission loss. In order to assess the influence an into muffler, simple that one and is internally partitioned with baffle conjunction various types extended tubes proposed. addition, avoid distortion high mode, mathematical model established using finite element method...

The combination of multi-access edge computing (MEC) and wireless power transfer (WPT) can potentially improve system performance prolong terminals’ battery lifetime. In this paper, we study cooperative computation in a powered (WP-MEC) system. system, there are an access point (AP) deployed with MEC server multiple cellular terminals that by harvested energy from station. computational task each terminal is partially completed locally offloaded to the AP nearby idle terminal. order minimize...

Mobile edge computing (MEC) pushes and caching resources close to the network edge, which allows devices offload computation-intensive tasks MEC servers. Considering that wireless signals may be easily blocked by obstacles, reconfigurable intelligent surface (RIS) has emerged as a promising technique improve efficiency of computation offloading. In this paper, we consider RIS-assisted network, where server caches service programs required for task execution RIS helps offloading in presence...

This paper investigates the performance of cooperative device-to-device (C-D2D) communications in a cellular network, where simultaneous wireless information and power transfer (SWIPT) technology is adopted by D2D transmitters (DTs). In this DTs can act as relays that consume portion energy harvested time switching (TS) strategy to satisfy quality service (QoS) requirements users (CUs) with poor channel conditions, exchange for spectrum resources CUs communications. To achieve sum-throughput...

To establish reliable wireless communication systems in underground mines, accurate channel modeling plays an indispensable role the design phase. In this paper, we propose ray tracing-based room-and-pillar mines. Specifically, propagation paths of signals are firstly determined horizontal plane a mine using tracing method. Then, two-dimensional (2D) converted into their corresponding three-dimensional (3D) counterparts by deriving heights intersection points at obstacles and locations...