ABSTRACT
Hydrogen energy from solar water-splitting is known as an ideal method with which to address the energy crisis and global environmental pollution. Herein, the first-principles calculations are carried out to study the photocatalytic water-splitting performance of single-layer GaInSe3 under biaxial strains from -2% to +2%. Calculations reveal that single-layer GaInSe3 under various biaxial strains has electronic bandgaps ranging from 1.11 to 1.28 eV under biaxial strain from -2% to +2%, as well as a completely separated valence band maximum and conduction band minimum. Meanwhile, the appropriate band edges for water-splitting and visible optical absorption up to ~3 × 105 cm-1 are obtained under biaxial strains from -2% to 0%. More impressively, the solar conversion efficiency of single-layer GaInSe3 under biaxial strains from -2% to 0% reaches over 30%. The OER of unstrained single-layer GaInSe3 can proceed without co-catalysts. These demonstrate that single-layer GaInSe3 is a viable material for solar water-splitting.
ABSTRACT
Hydrogen production through solar water-splitting offers a clean and renewable solution to tackle the ongoing issues of energy scarcity and environmental pollution. Here, the solar water-splitting performance of the ZnGeSe2 monolayer was explored via first-principles calculations. Our calculated results reveal that the ZnGeSe2 monolayer embodies stable configurations and semiconducting properties with direct bandgaps ranging from 1.23 to 1.60 eV under the biaxial strain from -1% to +2%. The generated holes and electrons of the ZnGeSe2 monolayer are separately distributed because of the intrinsic dipole. The calculated band edges of the ZnGeSe2 monolayer are demonstrated to be favorable for solar water-splitting. Additionally, the ZnGeSe2 monolayer exhibits strong optical absorption in the whole visible region. The hydrogen and oxygen evolution reactions can be accomplished without cocatalysts. Of particular significance, the solar to hydrogen (STH) efficiency of the ZnGeSe2 monolayer reaches up to 32%, far exceeding the economic value (10%). In light of these hallmarks, the ZnGeSe2 monolayer is demonstrated as an excellent water-splitting photocatalyst.
ABSTRACT
The difficulties such as how to accurately locate acupoints and safely insert needles are presented in acupuncture robot. The puncture robot with high technological similarity to acupuncture robot is getting mature, and a large number of human trials and animal experiments have been conducted for the development of puncture robot. Through comparing the similarities and differences between puncture robot and acupuncture robot in the aspects of through-skin puncture, needle insertion and needle removal, the valuable technology of puncture robot is analyzed for the development of acupuncture robot, and the crucial direction of technology migration is determined. â Integrating the mechanical feedback and medical imaging technology and utilizing the multi-modal perception to achieve the safety of acupuncture operation. â¡Emphasizing the integration of the existing designs of chest puncture robot to realize the acupuncture operation with inhalation and exhalation involved. â¢Focusing on the development of relevant technology of automatic needle removal through conducting the actual scenario of treatment with acupuncture robot in patients under non-anaesthetic condition.
Subject(s)
Acupuncture Therapy , Acupuncture , Robotics , Animals , Humans , Feasibility Studies , Punctures , NeedlesABSTRACT
Lobeline is an alkaloid derived from the leaves of an Indian tobacco plant (Lobelia inflata), which has been prepared by chemical synthesis. It is classified as a partial nicotinic agonist and has a long history of therapeutic usage ranging from emetic and respiratory stimulant to tobacco smoking cessation agent. The presence of both cis and trans isomers in lobeline is well known, and many studies on the relationship between the structure and pharmacological activity of lobeline and its analogs have been reported. However, it is a remarkable fact that no studies have reported the differences in pharmacological activities between the two isomers. In this article, we found that different degrees of isomerization of lobeline injection have significant differences in respiratory excitatory effects in pentobarbital sodium anesthetized rats. Compared with cis-lobeline injections, the respiratory excitatory effect was significantly reduced by 50.2% after administration of injections which contained 36.9% trans-lobeline. The study on the influencing factors of isomerization between two isomers shown that this isomerization was a one-way isomerism and only converted from cis to trans, where temperature was the catalytic factor and pH was the key factor. This study reports a new discovery. Despite the widespread use of ventilators, first-aid medicines such as nikethamide and lobeline has retired to second line, but as a nonselective antagonist with high affinity for a4b2 and a3b2 nicotinic acetylcholine receptors (nAChRs). In recent years, lobeline has shown great promise as a therapeutic drug for mental addiction and nervous system disorders, such as depression, Alzheimer disease and Parkinson disease. Therefore, we suggest that the differences between two isomers should be concerned in subsequent research papers and applications.
