Influence of Plasma Density Arrangement on Millimeter-Wave Transmission Characteristics

The advancement of millimeter wave and terahertz technologies have revolutionized high speed wireless networks and precise tracking systems. These technologies offer unique penetration capabilities in specific scenarios, significantly enhancing the capability to investigation plasma. Recent breakthroughs include the precise diagnosis of plasma electron density using terahertz time domain spectroscopy and the modeling of plasma sheaths in re-entry spacecraft through scattering matrices. Concurrently, extensive research efforts have been dedicated to comprehending plasma's influence on electromagnetic wave behaviors, encompassing reflection, transmission, absorption and also phase shift. In this paper, we employ COMSOL Multiphysics software to create an inductively coupled plasma (ICP) device, enabling the simulation of various plasma density arrangements. Our investigation focuses on unraveling the intricate interplay between plasma configurations and millimeter-wave transmission characteristics. The findings underscore the substantial impact of diverse plasma concentration arrangements on the behavior of electromagnetic waves traversing through them. Additionally, these arrangements endow the plasma with a discernible degree of frequency selectivity, thus expanding our understanding of plasma behavior in novel ways.Comment: To be published in 2023 Cross Strait Radio Science and Wireless Technology Conference (2023 CSRSWTC

Experimental and Theoretical Exploration of Terahertz Channel Performance through Glass Doors

In the evolving landscape of terahertz communication, the behavior of channels within indoor environments, particularly through glass doors, has garnered significant attention. This paper comprehensively investigates terahertz channel performance under such conditions, employing a measurement setup operational between 113 and 170 GHz. Analyzing scenarios frequently induced by human activity and environmental factors, like door movements, we established a comprehensive theoretical model. This model seamlessly integrates transmission, reflection, absorption, and diffraction mechanisms, leveraging the Fresnel formula, multi-layer transmission paradigm, and knife-edge diffraction theory. Our experimental results and theoretical predictions harmoniously align, revealing intricate dependencies, such as increased power loss at higher frequencies and larger incident angles. Furthermore, door interactions, whether opening or oscillations, significantly impact the terahertz channel. Notably, door edges lead to a power blockage surpassing the transmission loss of the glass itself but remaining inferior to metallic handle interferences. This paper's insights are pivotal for the design and fabrication of terahertz communication systems within indoor settings, pushing the boundaries of efficient and reliable communication.Comment: Scheduled to publish in Nano Communication Network

A Study on the Response of Oncomelania Hupensis Diffusion to the Flow Regime of Dongting Lake

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Channel Modeling for Terahertz Communications in Rain

Terahertz (THz) communication channels, integral to outdoor applications, are critically influenced by natural factors like rainfall. Our research focused on the nuanced effects of rain on these channels, employing an advanced rainfall emulation system. By analyzing key parameters such as rain rate, altitude based variations in rainfall, and diverse raindrop sizes, we identified the paramount significance of the number of raindrops in the THz channel, particularly in scenarios with constant rain rates but varying drop sizes. Central to our findings is a novel model grounded in Mie scattering theory, which adeptly incorporates the variability of raindrop size distributions at different altitudes. This model has displayed strong congruence with our experimental results. In essence, our study underscores the inadequacy of solely depending on a fixed ground-based rain rate and emphasizes the imperative of calibrating distribution metrics to cater to specific environmental and operational contexts.Comment: submitted to IEEE Transactions on Antennas and Propagatio

Monolithic full-color active-matrix micro-LED micro-display using InGaN/AlGaInP heterogeneous integration

A prototype of full-color active-matrix micro-light-emitting diode (micro-LED) micro-display with a pixel density of 391 pixel per inch (ppi) using InGaN/AlGaInP heterogeneous integration is demonstrated. InGaN blue/green dual-color micro-LED arrays realized on a single metal organic chemical vapor deposition (MOCVD)-grown GaN-on-Si epiwafer and AlGaInP red micro-LED arrays are both monolithically fabricated, followed by the integration with a common complementary metal oxide semiconductor (CMOS) backplane via flip-chip bonding technology to form a double-layer thin-film display structure. Full-color images with decent color gamut and brightness are successfully displayed through the fine adjustment of driving current densities of RGB subpixels. This full-color display combines the advantages of high quantum efficiency of InGaN material on blue/green light and AlGaInP material on red light through heterogeneous integration and high pixel density through monolithic fabrication approach, demonstrating the feasibility and prospects of high brightness, good color performance, and high-resolution micro-LED micro-displays in future metaverse applications

The prevalence of alcohol dependence and its association with hypertension: a population-based cross-sectional study4 in Xuzhou city, China

Abstract Background To describe the prevalence of alcohol dependence and to explore the relationship between alcohol dependence and newly detected hypertension in China. Methods A multistage stratified cluster sampling method was used to obtain samples from February to June 2013. The Michigan Alcoholism Screening Test was used to estimate alcohol dependence level. A standard questionnaire measured other independent variables. Enumeration data were analyzed using chi-square; quantitative data were analyzed using t-tests. Spearman correlation analysis and multivariate logistic regression analysis were performed to identify the relationship between alcohol dependence and hypertension. Results The alcohol dependence rate was 11.56%; 22.02% of males (3854/17501) and 1.74% of females (324/18656) were classified as alcohol dependent. The newly detected hypertension rate was 9.46% (3422/36157). Significant associations were found between alcohol dependence levels and blood pressure (P < 0.01). Alcohol dependence was positively correlated with systolic blood pressure (r = 0.071, P < 0.01) and diastolic blood pressure (r = 0.077, P < 0.01) and was an independent risk factor for hypertension after adjusting for confounders (low alcohol dependence: odds ratio [OR] = 1.44, 95% confidence intervals [CI] = 1.14–1.81, P < 0.01; light alcohol dependence: OR = 1.35, 95% CI = 1.11–1.64, P < 0.01; medium alcohol dependence: OR = 1.83, 95% CI = 1.40–2.41, P < 0.01). Conclusion Alcohol dependence was high and associated with hypertension. Health education and precautions against alcoholism should be implemented in Xuzhou city

Implantable and degradable antioxidant poly(ε-caprolactone)-lignin nanofiber membrane for effective osteoarthritis treatment

Osteoarthritis (OA) is one of the most common musculoskeletal disorders worldwide. Oxidative stress initiated by excessive free radicals such as reactive oxygen species (ROS) is a leading cause of cartilage degradation and OA. However, conventional injection or oral intake of antioxidants usually cannot provide effective treatment due to rapid clearance and degradation or low bioavailability. Here, a new strategy is proposed based on nanofibers made of poly (ε-caprolactone) (PCL) and PCL-grafted lignin (PCL-g-lignin) copolymer. Lignin offers intrinsic antioxidant activity while PCL tailors the mechanical properties. Electrospun PCL-lignin nanofibers show excellent antioxidant activity, low cytotoxicity and excellent anti-inflammatory effects as demonstrated using both H2O2-stimulated human chondrocytes and an OA rabbit model. PCL-lignin nanofibers inhibit ROS generation and activate antioxidant enzymes through autophagic mechanism. Arthroscopic implantation of nanofibrous membrane of PCL-lignin is effective to OA therapy because it is biocompatible, biodegradable and able to provide sustained antioxidant activity.Agency for Science, Technology and Research (A*STAR)This study was financially supported by National key R&D program of China (2018YFC1105900), the Guangxi Science and Technology Base and Talent Special Project (Grant No. GuikeAD17129012), and the local Science and Technology Development Project leading by the central government (the three-D printing and digital medical platform, Grant No. GuikeZY18164004), High level innovation teams and outstanding scholars in Guangxi Universities (The third batch). The authors gratefully acknowledge the financial support from the Institute of Materials Research and Engineering (IMRE) under the Agency of Science, Technology and Research (A*STAR)

Effects of expressive art therapy on health status of patients with chronic obstructive pulmonary disease: a community-based cluster randomized controlled trial

Background and objective: This study was performed to investigate the effect of expressive art therapy (EAT) on the health status of patients with chronic obstructive pulmonary disease (COPD). Methods: This community-based cluster randomized controlled trial involved patients with COPD from 16 communities in China. Participants received either EAT plus usual care (UC) or UC only. General practitioners were trained in EAT before the intervention. The primary outcomes were depression and anxiety symptoms, measured with the Hospital Anxiety and Depression Scale (HADS) and expressed as the HADS score for depression or anxiety (HADS-D or HADS-A, respectively). The secondary outcomes were the quality of life and dyspnoea, measured with the COPD assessment test (CAT). Dyspnoea was assessed using the modified Medical Research Council (mMRC) dyspnoea scale. Lung function was expressed as the forced expiratory volume in 1 s as a percentage of the predicted value [FEV 1 (% pred)]. Outcome data were collected from all participants at baseline, 2 and 6 months. Results: In total, 360 participants with COPD and comorbid depression were included in the analysis with the control group of 181 receiving UC only and the intervention group of 179 receiving EAT plus UC. The EAT group showed significantly greater improvement in the HADS-D and HADS-A scores than the UC group at 2 months ( p  < 0.0001 and p  < 0.001, respectively) and 6 months ( p  < 0.001 for both). The CAT and mMRC scores were significantly lower in the EAT group than in the UC group at 2 and 6 months ( p  < 0.001 for all). The FEV 1 (% pred) was significantly higher in the EAT group than in the UC group at 6 months ( p  < 0.01). Conclusion: General practitioners can deliver EAT interventions. EAT can effectively reduce anxiety and depression symptoms and dyspnoea, improve quality of life and improve the pulmonary function of patients with COPD