Sliding ferroelectricity and alterpiezoelectricity in a two-dimensional heterobilayer from the in-plane hole of g-CN.

It is well known that two-dimensional (2D) van der Waals (vdW) heterobilayers may undergo symmetry breaking in some specific stacking configurations, thus presenting three states (AA, AB, BA) with different out-of-plane (OOP) polarization, which is electrically switchable interlayer sliding. Here, we find that in two vdW heterobilayers (S-g-CN/graphene and T-g-CN/graphene) formed by a g-CN (S-g-CN and T-g-CN) monolayer and graphene monolayer, interlayer sliding can not only switch the OOP polarization, but also change the in-plane (IP) piezoelectric properties of the T-g-CN/graphene heterobilayer, between positive and negative piezoelectricity, which we call . We show first-principles evidence that the strong charge transfer of graphene contributes to the charge redistribution in graphene induced by the in-plane holes of g-CN, so that stacking configurations with different piezoelectric properties appear in the switching process of interlayer sliding.

Detection of skin thickness and density in healthy Chinese people by using high-frequency ultrasound.

Objectives: Due to a recent development of high-frequency ultrasound (HFUS) systems, it is easier to realize high-resolution in vivo imaging of the biological tissues. The object of this study was to map the thickness and echo density of skin layers in healthy Chinese people and assess the influence of gender, age, and region on it.

Methods: A total of 189 volunteers (85 male, 104 female) with age range of 22-75-year old (mean age of 41.

Comparison of dermoscopy and reflectance confocal microscopy accuracy for the diagnosis of psoriasis and lichen planus.

Background: Dermoscopy and reflectance confocal microscopy (RCM) as noninvasive tools are gaining increasing importance in the diagnosis of inflammatory skin disorders. The purpose of our study was to calculate and compare the diagnostic accuracy of dermoscopy and RCM in common inflammatory skin diseases.

Materials And Methods: We retrospectively collected clinical, dermoscopic, and RCM images of psoriasis and lichen planuscases from March 2018 to February 2021 in China-Japan Friendship Hospital.

Skin diseases in the Da Qing Diabetes Study: a cross-sectional study.

Background: The prevalence of skin diseases and diabetes mellitus (DM) are prominent around the world. The current scope of knowledge regarding the prevalence of skin diseases and comorbidities with type 2 DM (T2DM) is limited, leading to limited recognition of the correlations between skin diseases and T2DM.

Methods: We collected 383 subjects from the Da Qing Diabetes Study during the period from July 9th to September 1st, 2016.

Diagnostic capacity of skin tumor artificial intelligence-assisted decision-making software in real-world clinical settings.

Background: Youzhi artificial intelligence (AI) software is the AI-assisted decision-making system for diagnosing skin tumors. The high diagnostic accuracy of Youzhi AI software was previously validated in specific datasets. The objective of this study was to compare the performance of diagnostic capacity between Youzhi AI software and dermatologists in real-world clinical settings.

Dermoscopy in China: current status and future prospective.

Objective: Dermoscopy is a useful technique for improving the diagnostic accuracy of various types of skin disorders. In China, dermoscopy has been widely accepted, and domestic researchers have made tremendous progress in the field of dermoscopy. The main purpose of this review is to summarize the current status of dermoscopy in China and identify its future directions.

Renal tuberculosis and iliopsoas abscess: Two case reports.

The urinary system is the second most commonly affected site of extrapulmonary tuberculosis (TB). Due to the diverse and atypical clinical manifestations of urinary TB, the disease is easy to misdiagnose. In the present study, two cases of renal TB are reported, which had completely different clinical manifestations.