다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Single-layer metal dichalcogenides are two-dimensional semiconductors that present strong potential for electronic and sensing applications complementary to that of graphene.

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Electronics and optoelectronics of two-dimensional transition metal dichalcogenides.

Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

Phd by thesis

Titanium Dioxide Nanomaterials: Synthesis, Properties, Modifications, and Applications

This critical review shows the basis of photocatalytic water splitting and experimental points, and surveys heterogeneous photocatalyst materials for water splitting into H2 and O2, and H2 or O2 evolution from an aqueous solution containing a sacrificial reagent Many oxides consisting of metal cations with d0 and d10 configurations, metal (oxy)sulfide and metal (oxy)nitride photocatalysts have been reported, especially during the latest decade The fruitful photocatalyst library gives important information on factors affecting photocatalytic performances and design of new materials Photocatalytic water splitting and H2 evolution using abundant compounds as electron donors are expected to contribute to construction of a clean and simple system for solar hydrogen production, and a solution of global energy and environmental issues in the future (361 references)

Heterogeneous photocatalyst materials for water splitting

We experimentally demonstrated a record-breaking delivery of 127.8 Gb/s OFDM-PDM-PS-256QAM signal over 10 km SMF-28 fiber and 4.6 km wireless distance at W-band, employing polarization multiplexing technology and advanced DSP algorithms.

127.8 Gb/s OFDM-PDM-PS256QAM W-Band Signal Delivery over 10 km SMF-28 and 4.6 km Wireless Distance

In this letter, a novel MIMO linear and Volterra nonlinear equalizer (MIMOL-VNLE) is proposed for signal recovery in the photonics-aided terahertz wave (THz-wave) wireless communication system, which is proven to compensate for linear impairments, nonlinear impairments, and I/Q mixing effects simultaneously. Adopting the proposed algorithm, we experimentally demonstrated the single-channel transmission of 20-Gbaud 16-ary quadrature amplitude modulation (16QAM) THz-wave signal at 440-GHz over 1-m wireless distance.

Photonics-Aided Terahertz-Wave Wireless Communication Employing Advanced Post-Equalizer

We present a low-cost intensity-modulated direct detection (IM/DD) system for the transmission of high-order QAM signals at millimeter-wave (MMW) band at 87 GHz. The system uses photon-assisted MMW generation techniques to transmit modulated signals and receive signals through low-cost envelope detection. Discrete multi-tone (DMT) signals up to 8192QAM are modulated into a one-bit quantized on/off keying (OOK) signal with delta-sigma modulation (DSM) to avoid envelope detector saturation effects and reduce nonlinear noise interference. Additionally, multi-level digital-to-analog converters (DACs) are not required. The 87 GHz W-band signal can transmit data at a baud rate of 12 G over a wireless propagation range of 1.2 m. The experimental results show that the bit error ratio (BER) of the 1024QAM signal can reach the hard decision forward error correction (HD-FEC) threshold, and the BER of the 8192QAM signal can reach the soft decision forward error correction (SD-FEC) threshold. To our knowledge, this is the first time that the DSM modulation format is used in the IM/DD W-band wireless transmission system.

8192QAM Signal Transmission by an IM/DD System at W-Band Using Delta-Sigma Modulation

The intelligentization of future society puts forward an urgent demand for high-precision sensing and ultra-high-speed wireless communications in the upcoming beyond fifth-generation (B5G) era. We propose and experimentally demonstrate a novel spectrum-efficient MMW-over-fiber (MoF) architecture for joint sensing and communication in B5G optical-wireless converged networks. The proposed MoF architecture is based on polarization interleaving and polarization-insensitive filtering. In the proposed architecture, the sensing and communication sidebands are generated simultaneously through asymmetrical single-sideband (ASSB) modulation, whereas the two local oscillator (LO) sidebands up-converting the sensing and communication signals to MMW band are obtained by carrier-suppressed double-sideband (CS-DSB) modulation. By interleaving the two sets of sidebands for sensing and communication in two orthogonal polarizations, the demand for higher bandwidth devices and the occupied spectral grid can thus be effectively reduced. The ASSB modulation eliminates the chromatic-dispersion- (CD) induced power fading for long-reach services. The polarization-insensitive filtering removes the need for complicated polarization tracking, resulting in a simple structure at the remote units (RUs) and polarization-free digital signal processing (DSP) at the user ends (UEs). Moreover, the two sets of sidebands originate from a shared laser, so frequency offset estimation (FOE) can be avoided to further reduce the complexity and power consumption of the DSP, thereby facilitating a user-friendly terminal. The experimental results show that a ±15-mm ranging accuracy at B5G MMW band for single-target detection is achieved, and a 30-cm ranging resolution for dual-target detection is also realized. Furthermore, a 23-Gbit/s error-free transmission rate at 28GHz over 5.41-km single-mode fiber (SMF) and 2-m wireless distance is successfully demonstrated without frequency offset compensation.

A Spectrum-Efficient MoF Architecture for Joint Sensing and Communication in B5G Based on Polarization Interleaving and Polarization-Insensitive Filtering

During the past years, polymeric carbon nitrides (CNs) have shown excellent ability toward photocatalytic water reduction and CO2 reduction, as a promising means of efficient solar-to-fuel conversion. This chapter provides a comprehensive overview of strategies for enhancing the performance of CN-based photocatalysts in H2 production and CO2 reduction. The strategies include (1) increasing charge carrier generation by hollow structure creation, elemental doping, and molecular structure modification; (2) boosting charge separation by reducing the thickness of CNs, improving the crystallinity of CNs, and creating heterostructures of metal/CNs, graphene/CNs, type II, and direct Z-scheme heterojunctions; and (3) promoting the surface catalytic process by creation of porous structure and surface defects, construction of hybrid materials with metal–organic frameworks and layered double hydroxides, and facet tuning of metal cocatalysts. Finally, the concluding remarks and the current challenges are highlighted with some perspectives for the future development of CN-based photocatalytic materials.

Jiaguo Yu

Papers

127.8 Gb/s OFDM-PDM-PS256QAM W-Band Signal Delivery over 10 km SMF-28 and 4.6 km Wireless Distance

Photonics-Aided Terahertz-Wave Wireless Communication Employing Advanced Post-Equalizer

8192QAM Signal Transmission by an IM/DD System at W-Band Using Delta-Sigma Modulation

A Spectrum-Efficient MoF Architecture for Joint Sensing and Communication in B5G Based on Polarization Interleaving and Polarization-Insensitive Filtering

Photocatalysts based on polymeric carbon nitride for solar-to-fuel conversion