Dual-channel near-field holographic MIMO communications based on programmable digital coding metasurface and electromagnetic theory.

Holographic multiple-input multiple-output (MIMO) method leverages spatial diversity to enhance the performance of wireless communications and is expected to be a key technology enabling for high-speed data services in the forthcoming sixth generation (6G) networks. However, the antenna array commonly used in the traditional massive MIMO cannot meet the requirements of low cost, low complexity and high spatial resolution simultaneously, especially in higher frequency bands. Hence it is important to achieve a feasible hardware platform to support theoretical study of the holographic MIMO communications.

Two-dimensional and high-order directional information modulations for secure communications based on programmable metasurface.

Conventional wireless communication schemes indiscriminately transmit information into the whole space and pose inherent security risks. Recently, directional information modulation (DIM) has attracted enormous attention as a promising technology. DIM generates correct constellation symbols in the desired directions and distorts them in undesired directions, thus ensuring the security of the transmitted information.

A Dual-Polarization Programmable Metasurface for Green and Secure Wireless Communication.

Dual-polarization programmable metasurfaces can flexibly manipulate electromagnetic (EM) waves while providing approximately twice the information capacity. Therefore, they hold significant applications in next-generation communication systems. However, there are three challenges associated with the existing dual-polarization programmable metasurfaces.

Macroscopic model and statistical model to characterize electromagnetic information of a digital coding metasurface.

A digital coding metasurface is a platform connecting the digital space and electromagnetic wave space, and has therefore gained much attention due to its intriguing value in reshaping wireless channels and realizing new communication architectures. Correspondingly, there is an urgent need for electromagnetic information theory that reveals the upper limit of communication capacity and supports the accurate design of metasurface-based communication systems. To this end, we propose a macroscopic model and a statistical model of the digital coding metasurface.

Accumulation degree and risk assessment of metals in street dust from a developing city in Central Taiwan.

Due to the numerous industrial parks and high traffic density in Miaoli, Taiwan, large amounts of metals may be released into the atmosphere, accumulating in street dust. Therefore, this study aimed to collect street dust in Miaoli to quantify the metals and assess the accumulation degree, sources, and potential risks. The enrichment factor (EF), geological accumulation index (I), ecological risk, and non-carcinogenic and lifetime carcinogenic risk were estimated to assess the accumulation degree and the potential environmental and health risks.

Multi-frequency amplitude-programmable metasurface for multi-channel electromagnetic controls.

The digital and programmable metasurfaces, as opposed to conventional metasurfaces, offer a more sophisticated method of collaborating information and physics, showcasing several real-time controls to electromagnetic (EM) ways in succinct ways. In this work, we propose a multi-frequency amplitude-programmable (MFAP) metasurface with multiple frequency channels to enhance the presentation and manipulation of EM data. With this metasurface, the reflected amplitudes can be simultaneously and independently encoded between high (digit "1") and low (digit "0") levels.

Efficacy and Safety of Conversion Therapy by Intraperitoneal and Intravenous Paclitaxel Plus Oral S-1 in Gastric Cancer Patients With Peritoneal Metastasis: A Prospective Phase II Study.

Background: Neoadjuvant intraperitoneal and systemic chemotherapy (NIPS) has shown promising results in gastric cancer (GC) with peritoneal metastasis. However, clinical practice experience of NIPS is still lacking in China. In this study, we investigate the efficacy and safety of NIPS in Chinese patients.

Flexible Terahertz Beam Manipulations Based on Liquid-Crystal-Integrated Programmable Metasurfaces.

Terahertz wave manipulations, especially the phase manipulations, through metasurfaces has attracted considerable interests. Here, we develop a terahertz beam steering device using the liquid-crystal (LC)-integrated programmable metasurface. Specifically, a reflective-type 1 bit metasurface element is designed by employing a multilayer structure composed of metallic back plate-LC-complementary split ring resonator (CSRR).

3-Pyridylacetic-Based Lanthanide Complexes Exhibiting Magnetic Entropy Changes, Single-Molecule Magnet, and Fluorescence.

Four complexes from lanthanides, 3-pyridylacetate, and 1,10-phenanthroline, formulated as [Ln(3-PAA)(μ-Cl)(phen)](ClO) [Ln = Gd(), Dy(), Eu(), Tb(), 3-PAA = 3-pyridylacetic acid, phen = 1,10-phenanthroline], were obtained. The four compounds were characterized by IR spectra, thermogravimetric analyses, powder X-ray diffraction, and single-crystal X-ray diffraction. Compounds - are isomorphous, and they have a dinuclear structure.

The Treatment of Subtrochanteric Fracture with Reversed Contralateral Distal Femoral Locking Compression Plate (DF-LCP) Using a Progressive and Intermittent Drilling Procedure in Three Osteopetrosis Patients.

Objective: To describe the application of reversed contralateral distal femoral locking compression plate (DF-LCP) inserted through a progressive and intermittent drilling procedure in the treatment of osteopetrotic subtrochanteric fracture (OSF).

Methods: Three patients (one male and two females with an average age of 45.33 ± 11.

Effect of sidedness on survival among patients with early-stage colon cancer: a SEER-based propensity score matching analysis.

Background: Most previous studies compared survival between left-sided and right-sided colon cancer without adjustment for clinicopathological parameters. We investigated the effect of sidedness on survival among patients with early-stage colon cancer, using a propensity score matching method.

Methods: The 18 registry custom data within the SEER database were used to identify patients who were diagnosed with colon cancer between 2010 and 2014.

Characterisation of the complete chloroplast genome of Swingle and phylogenetic relationships.

In this study, we reported the complete chloroplast genome of Swingle using the HiSeq-4000 sequencing. The chloroplast genome size is 160,229 bp, which consists of a large single-copy region (87,774 bp), a small single-copy region (18,721 bp), and a pair of IR regions (26,867 bp). The chloroplast genome contains 114 unique genes, including 80 protein-coding genes, 30 tRNAs, and 4 rRNAs.

3D Printing of BaTiO Piezoelectric Ceramics for a Focused Ultrasonic Array.

BaTiO (BTO) ceramics were fabricated based on stereolithography technology. The microstructures and electric properties of the BTO ceramics were studied. X-ray patterns of sintered BTO ceramics indicated that the tetragonal phase had formed, and the grain size increased clearly as BTO weight percentage increased.

The renal protect function of erythropoietin after release of bilateral ureteral obstruction in a rat model.

Congenital urinary tract obstruction is one of the most frequent malformations in fetuses or neonates, which usually causes profound impairment of renal function including reductions in both glomerular filtration rate (GFR) and tubular handling of water and solutes. Although obstruction can be released by surgical operation, the child will suffer from diuresis for sometime. It has been reported that erythropoietin (EPO) could prevent the down-regulation of aquaporin-2 (AQP2) and urinary-concentrating defects induced by renal ischemia/reperfusion (I/R) injury.

Reconstruction of bladder function and prevention of renal deterioration by means of end-to-side neurorrhaphy in rats with neurogenic bladder.

Aims: To investigate the feasibility of restoring bladder function and prevention of renal deterioration by neurorrhaphy in rats with neurogenic bladder (NB).

Methods: Forty-two rats were assigned to the end-to-side nerve coaptation group (ECG, n = 16), no nerve coaptation group (NCG, n = 16), and control group (CG, n = 10). In the ECG, the left ventral root (VR) and dorsal root (DR) of L6 and S1 were transected, and the distal stump of L6VR was sutured to the lateral face of L4VR.

Prevalence of Spina Bifida Occulta and Its Relationship With Overactive Bladder in Middle-Aged and Elderly Chinese People.

Purpose: To investigate the prevalence of spina bifida occulta (SBO) and its relationship with the presence of overactive bladder (OAB) in middle-aged and elderly people in China.

Methods: A cross-sectional community-based survey was carried out at 7 communities in Zhengzhou City, China from December 15, 2013 to June 10, 2014, where residents aged over 40 years were randomly selected to participate. All of the participants underwent lumbosacral radiographic analysis and relevant laboratory tests.

Role of miR-21 in alkalinity stress tolerance in tilapia.

MicroRNAs (miRNAs) are a class of short, evolutionary conserved non-coding RNA molecules, which are shown as the key regulators of many biological functions. External stress can alter miRNA expression levels, thereby changing the expression of mRNA target genes. Here, we show that miR-21 is involved in the regulation of alkalinity tolerance in Nile tilapia.

[The use of degloving approach in the treatment of nasal-orbital-ethmoid fracture].

Purpose: To explore the method and effect of degloving approach in the treatment of nasal-orbital-ethmoid(NOE) complex fracture surgery.

Methods: Eleven cases of unilateral nasal-orbital-ethmoid fracture(NOE) were selected from Medical Center of Stomatology, Foshan Hospital of Traditional Chinese Medicine. 6 were orbital fracture, 5 were nasal fracture.

Stereoselective synthesis of fluorinated 2,3-dihydroquinolin-4(1H)-ones via a one-pot multistep transformation.

A new organocatalytic one-pot multistep transformation via Knoevenagel condensation/aza-Michael addition/electrophilic fluorination has been developed. Simple starting materials were used under mild conditions to construct fluorinated 2,3-dihydroquinolin-4(1H)-one derivatives in good to high yields (up to 98%) and diastereoselectivities (dr up to 99/1).

Role of Kasai procedure in surgery of hilar bile duct strictures.

Aim: To assess the application of the Kasai procedure in the surgical management of hilar bile duct strictures.

Methods: Ten consecutive patients between 2005 and 2011 with hilar bile duct strictures who underwent the Kasai procedure were retrospectively analyzed. Kasai portoenterostomy with the placement of biliary stents was performed in all patients.

[Transmasseter approach to mid-and-low condylar fractures by mini-retromandibular access].

Objective: To explore a new access for internal rigid fixation of mandibular mid-and-low condylar fracture.

Methods: 16 patients of unilateral mid-and-low condylar fractures were treated with a 2cm mini-retromandibular approach. The subcutaneous tissues superficial to the superficial muscular aponeurotic system (SMAS) were dissected forward that parallel to the masseter muscle fiber bundles, aiming to the fracture.

Eagle's syndrome treated with dissection of the styloid process via an extraoral approach combined with antidepressants.

Objective: To evaluate the outcome of dissecting the styloid process via an extraoral approach combined with antidepressants for treating Eagle's syndrome.

Methods: Twenty-two patients with Eagle's syndrome underwent resection of the elongated styloid processes under general anaesthesia via an extraoral approach. All patients completed a self-rating depression scale preoperatively, and a score over 49 was defined as depression.