Conformal high-efficiency ultra-thin flexible rectifying metasurface with a simple structure.

This paper proposes a conformal high-efficiency ultra-thin flexible rectifying metasurface (RMS) with a simple structure applied for wireless power transferring (WPT), featuring polarization insensitivity and wide-angle incidence capabilities. The RMS unit adopts a rotationally symmetric structure consisting of double rings and cross-shaped elements, with two diodes placed in the gap of the cross-shaped to achieve polarization insensitivity. Simultaneously, by adjusting the dimensions of the "double ring and cross" structure, its output impedance is varied to achieve conjugate matching with the diode input impedance, thereby eliminating the impedance matching network.

Fast Multifrequency Phase Unwrapping Method Based on 3D Printing Object Appearance Acquisition.

3D printing is an indispensable technology in modern life and is widely used in aerospace, exoskeleton, and architecture. The increasing accuracy requirements of 3D printed objects in these fields require high-precision measurement methods to obtain accurate data. Based on the precision measurement requirements, in this study, a fast multifrequency phase unwrapping method based on 3D printing object appearance acquisition is proposed.

[Spatio-temporal Evolution of Carbon Emissions and Emission Reduction Paths in the Northern Farming-pastoral Ecotone].

The farming-pastoral ecotone has an important strategic place in the energy supply and ecological layout of China. Thus, exploring the spatial and temporal variation characteristics of carbon emissions in this region will help to deeply understand the information on the historical carbon emissions in China's energy production bases and provide data references for the formulation of differentiated emission reduction policies and the promotion of regional energy-saving and carbon-reducing measures, which is of great significance for the realization of low-carbon economic development. This study constructed a spatialization model of carbon emissions based on land use, night lighting, and provincial energy consumption data； explored the spatiotemporal changes and aggregation characteristics of carbon emissions in the farming-pastoral ecotone from 1995 to 2020 using the global Moran's index and hotspot analysis； and then combined it with the slack-based measure model to calculate the carbon emission efficiency and emission reduction potential of each city from 2010 to 2020 and classify cities to propose a differentiated emission reduction path.

A novel T2-weighted series-based modified vertebral bone quality score for evaluating bone mineral density.

Objective: To evaluate the modified vertebral bone quality (VBQ) method on the magnetic resonance imaging (MRI) T1-weighted (T1w), T2-weighted (T2w), and fat suppression (FS) series in evaluating bone mineral density (BMD) for patients with degenerative lumbar disease.

Methods: We reviewed preoperative data of postmenopausal female patients aged ≥ 50 years hospitalized to undergo lumbar surgery for degenerative lumbar disease with available MRI and dual-energy X-ray absorptiometry (DEXA). Patients were categorized into three groups according to T-score.

Positive correlation between the proximal femur Hounsfield units from routine CT and DXA results.

To determinate the correlation between the proximal femur Hounsfield unit (HU) value and dual-energy X-ray absorptiometry (DXA) results, and to identify its feasibility for opportunistic screening osteoporosis. A total of 680 patients underwent computed tomography (CT) containing proximal femur and DXA test within 6 months between 2010 and 2020 in our hospital. The CT HU value of four axial slices of the proximal femur were measured.

Reduction effect of oral pravastatin on the acute phase response to intravenous zoledronic acid: protocol for a real-world prospective, placebo-controlled trial.

Introduction: Zoledronic acid (ZA) has been used as a first-line treatment in patients with osteoporosis (OP) who receive an annual injection of 5 mg. However, side effects of bone pain and fever, known as the acute phase response (APR), have often been observed after clinical usage. A meta-analysis reported that the incidence of APR was 49.

A Low-Profile and High-isolated MIMO Antenna for 5G Mobile Terminal.

An eight-element multiple-input multiple-output (MIMO) frame antenna array in the 3.5 GHz band (3400-3600 MHz) for 5G mobile terminal systems was presented. By using the adjacent grounding and electromagnetic coupling feeding technology, the loop antenna element could generate two resonant frequencies, thus effectively expanding its bandwidth.

Prevalence of Osteoporosis in Patients Undergoing Lumbar Fusion for Lumbar Degenerative Diseases: A Combination of DXA and Hounsfield Units.

Study Design: Retrospective analysis.

Objective: To investigate the prevalence of osteoporosis (OP) in patients undergoing lumbar fusion for lumbar degenerative diseases (LDD).

Summary Of Background Data: OP is related to many complications after lumbar fusion for patients with LDD.

Use of Hounsfield units of S1 body to diagnose osteoporosis in patients with lumbar degenerative diseases.

OBJECTIVEThe aim of this study was to evaluate the use of Hounsfield unit (HU) values of the S1 body to diagnose osteoporosis in patients with lumbar degenerative diseases.METHODSThe records of 316 patients of ages ≥ 50 years and requiring surgery for lumbar degenerative diseases were reviewed. The bone mineral density (BMD) of the S1 body and L1 was measured in HU with preoperative lumbar CT.

A Compact Broadband Antenna with Dual-Resonance for Implantable Devices.

A compact broadband implantable patch antenna is designed for the field of biotelemetry and experimentally demonstrated using the Medical Device Radiocommunications Service (MedRadio) band (401⁻406 MHz). The proposed antenna can obtain a broad impedance bandwidth by exciting dual-resonant frequencies, and has a compact structure using bent metal radiating strips and a short strategy. The total volume of the proposed antenna, including substrate and superstrate, is about 479 mm³ (23 × 16.

The use of CT Hounsfield unit values to identify the undiagnosed spinal osteoporosis in patients with lumbar degenerative diseases.

Purposes: Our purpose was to use computed tomography (CT) Hounsfield unit (HU) values to identify the undiagnosed spinal osteoporosis in patients with lumbar degenerative diseases.

Methods: A total of 334 patients with lumbar degenerative diseases were retrospectively reviewed and divided into two groups according to the degree of lumbar degenerative changes in preoperative lumbar CT images. Patients who had at least three vertebrae with severe degeneration at L1-L4 were placed in the degenerative group, and others were placed in the control group.

Comparison of the effects of once-weekly and once-daily rhPTH (1-34) injections on promoting fracture healing in rodents.

To compare the efficacy of once-weekly and once-daily subcutaneous injections of teriparatide (recombinant human parathyroid hormone 1-34) on fracture healing, 50 adult male Sprague-Dawley rats were subjected to a unilateral tibia fracture and received internal fixation with a Kirschner needle. Based on the injection dose and frequency, the rats were randomly divided into five groups (n = 10 each): subcutaneous injections of saline or 10 µg/kg/w, 20 µg/kg/w, 10 µg/kg/d, and 20 µg/kg/d teriparatide. Four weeks later, the rats were euthanatized, and the fractured tibiae were assessed using X-rays, dual-energy X-ray absorptiometry, micro-computed tomography, the three-point bending biomechanics test, and histology.

A Convenient In Vivo Model Using Small Interfering RNA Silencing to Rapidly Assess Skeletal Gene Function.

It is difficult to study bone in vitro because it contains various cell types that engage in cross-talk. Bone biologically links various organs, and it has thus become increasingly evident that skeletal physiology must be studied in an integrative manner in an intact animal. We developed a model using local intraosseous small interfering RNA (siRNA) injection to rapidly assess the effects of a target gene on the local skeletal environment.