Lei Wang

Bio: Lei Wang is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Precipitation & Medicine. The author has an hindex of 50, co-authored 429 publications receiving 9543 citations. Previous affiliations of Lei Wang include Taizhou University & Peking University.

Superconducting magnet winding stress overload protection device

Abstract: A superconducting magnet winding stress overload protection device consists of a base, two support units and one chute unit. The base is located at the bottommost end of the whole device, the support units are respectively installed at two ends of the base, and the chute unit is welded between the support units. A spring, a slide block and the like are installed in a chute and play a protective role. In the solenoid superconducting magnet winding process, certain uncontrollable mechanical disturbance causes superconducting wire stress overload, and accordingly a breakage accident of a superconducting wire occurs. The superconducting magnet winding stress overload protection device can play a superconducting wire protecting role when the superconducting wire is in a tensile stress overload state.

The Implementation of Patient-Centered Humanistic Care for COVID-19 Closely Contacted Hemodialysis Patients Under the Hospital-Based Group Medical Quarantine: A Brief Research Report.

Abstract: In February 2020, an inpatient in Peking University People's Hospital (PKUPH), China, was confirmed positive for the novel coronavirus. In this case, 143 hemodialysis patients were labeled as close contacts and required to be placed under the hospital-based group medical quarantine (HB-GMQ) for 2 weeks by the authorities. After the case was reported, false or misleading information about the case flourished on social media platforms, which led to infodemic. Under this context, PKUPH adopted patient-centered humanistic care to implement the HB-GMQ, through the synergy of administrative, healthcare, logistical, and other measures under the model of patient-centered care of the Massachusetts Medical Society (MMS). As a result, all the patients tided over the HB-GMQ with no COVID-19 infection and no unanticipated adverse events, and all met the criteria for lifting the HB-GMQ. According to the questionnaires taken during the HB-GMQ, a high level of satisfaction was found among the quarantined and no symptomatic increase of anxiety and depression in the patients before and during the HB-GMQ, by comparing the Zung self-rating anxiety scale (SAS) and self-rating depression scale (SDS) conducted in December 2019 and on the 12th day of the HB-GMQ. This article is to brief on PKUPH's experience in implementing patient-centered humanistic care tailored to hemodialysis patients under the HB-GMQ, and to validate the hypothesis that patient-centered humanistic care is effective and helpful to help them tide over the HB-GMQ, so as to shed light on how to implement the HB-GMQ and cope with the HB-GMQ-induced problems in other hospitals.

Droplet motion on flexible superhydrophobic porous sponge surface

Abstract: Droplet capture and release are very significant for droplet manipulation on a superhydrophobic surface. Once the aqueous droplets impact the stiff superhydrophobic surface, they easily detach from the surface and generate chaotic motion without much energy loss. Thus, it is difficult to catch and manipulate the droplets falling on these kinds of surfaces. In this study, a droplet was captured after impacting the superhydrophobic porous sponge. Most of the kinetic energy of a falling droplet is transferred into the elastic potential energy of a sponge. The absorbed energy in the deformation process and the elastic modulus of sponge were adjusted by the porosity of the sponge. With the decrease in density, the elastic modulus of the sponge decreases, and the energy loss increases. During the droplet impacting process, the sponge with smaller elastic modulus can obtain much more energy from the droplet, which makes it easy to drag and capture the droplet. This new design also has other potential applications, such as water collection and fog harvest.

Preparation method and application of multistage hierarchical structure iron-nickel alloy catalyst

Abstract: The invention provides a preparation method and application of a multistage hierarchical structure iron-nickel alloy catalyst. According to the invention, a proper amount of citric acid is used as a chelating agent, an excessive metal salt solution is cooperatively utilized, and the high-dispersion monolithic FeNi alloy catalyst with a foamed nickel loading size of 5-12 nm is prepared through a hydrothermal process and subsequent calcination-reduction steps. The bottom layer of the catalyst is composed of nanosheet arrays growing in a staggered manner, and the top layer of the catalyst is spherical nanoparticles formed by self-assembly, so the catalyst is endowed with a developed pore structure, which is favorable for enhancing a subsequent surface catalytic reaction, the resistivity of afoamed nickel substrate is improved, and the catalyst can be used for an electrothermal catalytic process. The multistage hierarchical structure morphology of the catalyst overcomes the defects that atraditional supported catalyst is easy to fall off from the surface of a carrier and has poor dispersity and that active particles are easy to agglomerate, and widens the application range of a foamed nickel material in the field of electrothermal catalysis.

Climate Change 2007: The Physical Science Basis.

Abstract: Cause, conseguenze e strategie di mitigazione Proponiamo il primo di una serie di articoli in cui affronteremo l’attuale problema dei mutamenti climatici. Presentiamo il documento redatto, votato e pubblicato dall’Ipcc - Comitato intergovernativo sui cambiamenti climatici - che illustra la sintesi delle ricerche svolte su questo tema rilevante.

Numerical study of convection observed during the Winter Monsoon Experiment using a mesoscale two-dimensional model [presentation]

Abstract: Abstract A two-dimensional version of the Pennsylvania State University mesoscale model has been applied to Winter Monsoon Experiment data in order to simulate the diurnally occurring convection observed over the South China Sea. The domain includes a representation of part of Borneo as well as the sea so that the model can simulate the initiation of convection. Also included in the model are parameterizations of mesoscale ice phase and moisture processes and longwave and shortwave radiation with a diurnal cycle. This allows use of the model to test the relative importance of various heating mechanisms to the stratiform cloud deck, which typically occupies several hundred kilometers of the domain. Frank and Cohen's cumulus parameterization scheme is employed to represent vital unresolved vertical transports in the convective area. The major conclusions are: Ice phase processes are important in determining the level of maximum large-scale heating and vertical motion because there is a strong anvil componen...

Carbon quantum dots and their applications

Abstract: Fluorescent carbon nanoparticles or carbon quantum dots (CQDs) are a new class of carbon nanomaterials that have emerged recently and have garnered much interest as potential competitors to conventional semiconductor quantum dots. In addition to their comparable optical properties, CQDs have the desired advantages of low toxicity, environmental friendliness low cost and simple synthetic routes. Moreover, surface passivation and functionalization of CQDs allow for the control of their physicochemical properties. Since their discovery, CQDs have found many applications in the fields of chemical sensing, biosensing, bioimaging, nanomedicine, photocatalysis and electrocatalysis. This article reviews the progress in the research and development of CQDs with an emphasis on their synthesis, functionalization and technical applications along with some discussion on challenges and perspectives in this exciting and promising field.