Current Chinese Science - Volume 3, Issue 2, 2023

Introduction: Representations play an essential role in learning artificial and biological systems by producing informative structures associated with characteristic patterns in the sensory environment. In this work, we examined unsupervised latent representations of images of basic geometric shapes with neural network models of unsupervised generative self-learning. Background: Unsupervised concept learning with generativ Read More

Absorbers are devices that internally consume electromagnetic waves to partially or completely attenuate them. The basic idea is to absorb electromagnetic radiation by resonating the intended surface with the incident electromagnetic waves. This article focuses on the development of the absorber (from single-band to multi-band, narrow to broadband, non-tunable to tunable, and so on). The basic absorption principle o Read More

Background and Objectives: Patients with intractable cutaneous injuries and complications such as severe ulcers and dysfunctions often result in unfavorable prognosis and burdensome possessions esthetically and psychosocially. This study aimed to evaluate the preliminary safety and efficacy outcomes of hyaluronic acid/placenta-derived mesenchymal stem/stromal cells (HA/P-MSCs) composite upon extensive traumas Read More

Aims: This work reports a 405 nm photodetector based on the thermal evaporated CsPbBr3-CsPb2Br5 compound thin film. Background: The post-annealing process of the CsPbBr3-CsPb2Br5 compound thin film prepared by the thermal evaporation method has been improved in this work. To enhance the crystallization and photoresponse properties of the thin films, dimethyl sulfoxide (DMSO) steam was used in the postanneali Read More

Background: Hong Kong is situated on the coast of the south-eastern tip of China. A sub-tropical climate brings this coastal city a rainy season from April to October each year. Rainfall intensities as high as 50 mm to 100 mm per hour and 250 mm to 350 mm in 24 hours are not uncommon. With the hilly terrain and densely populated development, Hong Kong is susceptible to land-sliding during heavy rainstorms. Concerted efforts Read More

The accurate description of strongly correlated systems, also known as multireference systems, requires a balanced treatment of static and dynamic correlations and is an important target for developing quantum chemical methods. An appealing treatment to economically describe strongly correlated systems is the multireference density function theory (MRDFT) approach, in which the static correlation is included in Read More

Background: The covariance matching procedure of the measurement noise covariance, namely the R matrix, was processed in singular value decomposition (SVD), which is one of the single-frame methods. Aims: Tuning the system noise covariance Q matrix for the single-frame method aided Kalman filtering algorithm. Objective: Develop the R and Q double covariance matching rule for the single-frame method aided Ka Read More