Biography:

In the past Yufeng Wang has collaborated on articles with Xiaoli Wang and Xiaohua Cao. One of their most recent publications is Multiplicity dependence of the mass of φ mesons from Si+Au collisions at 14.6 A·GeV/c. Which was published in journal Nuclear Physics A.

More information about Yufeng Wang research including statistics on their citations can be found on their Copernicus Academic profile page.

Yufeng Wang's Articles: (41)

Multiplicity dependence of the mass of φ mesons from Si+Au collisions at 14.6 A·GeV/c

AbstractThe multiplicity dependence of the mass of φ mesons was studied for central Si+Au collisions. It was found that the mass of φ mesons for the events with the highest multiplicity (top 2% of the interaction cross-section) dropped 2.3 ± 0.9 MeV compared to the mass of normal φ-meson. The momentum dependence of the φ-meson mass is also studied. A preliminary analysis of possible experimental contributions to this effect is presented.

The effects of cognitive-behavioral therapy on intrinsic functional brain networks in adults with attention-deficit/hyperactivity disorder

Highlights•We explored the CBT effects on whole-brain connectivity in adults with ADHD.•ADHD showed increased rFCS in fronto-parietal network and cerebellum following CBT.•Changes of FC between bilateral SPG correlated with that of ADHD scores.•CBT may share common brain mechanism with the pharmacology in adults with ADHD.

Research ReportAbnormal resting-state functional connectivity patterns of the putamen in medication-naïve children with attention deficit hyperactivity disorder

AbstractStructural and functional alterations of the putamen have been reported in patients with attention deficit hyperactivity disorder (ADHD), but the functional relationships between this area and other brain regions are seldom explored. In the present study, seed-based correlation analyses were performed in the resting-state functional magnetic resonance imaging (fMRI) data to examine the differences in functional connectivity of the putamen between medication-naïve children with ADHD and normal children. Positive functional connectivity with the putamen-ROIs was seen in bilateral sensorimotor area, prefrontal cortex, insula, superior temporal gyrus and subcortical regions and negative functional connectivity was located in bilateral parietal and occipital cortex as well as clusters in the frontal, middle temporal cortex and cerebellum. Group comparison showed that decreases in functional connectivity with the putamen-ROIs were observed in ADHD relative to the controls, except for the right globus pallidus/thalamus, which showed increased positive connectivity with left putamen-ROI. For children with ADHD, areas exhibiting decreased positive functional connectivity with left putamen-ROI were seen in right frontal and limbic regions, and regions showing decreased negative connectivity with the putamen-ROIs were observed in areas belonging to the default mode network (for left putamen-ROI, including right cerebellum and right temporal lobe; for right putamen-ROI, including left cerebellum and right precuneus). The above results suggest that abnormal functional relationships between the putamen and the cortical–striatal–thalamic circuits as well as the default mode network may underlie the pathological basis of ADHD.

Schwarz-type problem of nonhomogeneous Cauchy–Riemann equation on a triangle☆

AbstractWe consider the Schwarz-type boundary-value problem (BVP) of the nonhomogeneous Cauchy–Riemann equation on an isosceles orthogonal triangle. By the technique of plane parqueting and the Cauchy–Pompeiu formula on the triangle, the Schwarz–Poisson formula is obtained. We also investigate boundary behaviors of the Schwarz-type operator and the Pompeiu-type operator. Especially, boundary-values at the corners are proved to exist. Finally, the solution of the Schwarz-type BVP is explicitly obtained.

On the initial–boundary problem for fourth order wave equations with damping, strain and source terms

AbstractIn this paper we study the global existence and blow-up of solutions to the fourth order equations utt+ut+Δ2u−αΔu−∑i=1n∂∂xi(θi(uxi))=f(u),x∈Ω,t>0, where α≥0.Under appropriate assumptions on the initial data and parameters in the above equation we establish two results on blow-up of solutions with arbitrary initial energy, −∞

Synthesis of mono-dispersed Fe-Co nanoparticles with precise composition control

Highlights•Mono-dispersed FeCo nanoparticles were synthesized.•High magnetization was achieved on as-synthesized FeCo nanoparticles.•A precise composition control was achieved on as-synthesized FeCo nanoparticles.

A detection of atmospheric relative humidity profile by UV Raman lidar

AbstractA new spectroscopic filter constructed with a high-spectral-resolution grating and two narrow-band mirrors is designed to separate the elastic scattering and the vibrational Raman scattering spectra in an ultraviolet (UV) Raman lidar system. The density of humidity and water vapor mixing ratio are calculated from the vibrational Raman scattering signals of N2 and H2O. Water vapor mixing ratio is retrieved from this development. With this measured water vapor mixing ratio, the relative humidity is calculated with atmospheric temperature profile obtained by another Raman temperature lidar. Preliminary experiments and comparison results between lidar and radiosonde showed that the UV Raman lidar system has the capability for profiling the water vapor mixing ratio up to a height of 2 km with less than 10% of the uncertainty under the conditions of laser energy of 300 mJ and signal-averaging time of 10 min.

Observations of the boundary layer structure and aerosol properties over Xi'an using an eye-safe Mie scattering Lidar

AbstractAn eye-safe micro-pulsed Mie scattering lidar (MPL) system at a wavelength of 532 nm was built for routine observations of atmospheric optical properties of the lower troposphere. The lidar is operated in an analog mode with three-dimensional (3D) scanning capability. Observations were carried out for obtaining detailed information of the urban boundary layer (UBL) over Xi'an, China. The parameters that can be measured include aerosol extinction coefficient and optical depth (AOD), structure of the UBL, and the mixed layer depth (MLD). The results indicate that the height of UBL shows both temporal and spatial variations over Xi'an. It is generally lower in the early morning and dusk than during the daytime. MLD is driven by the convective air motions and strongly correlated with the aerosol diurnal changes which tend to fall during night and rise during day.

Extraction, purification and physicochemical properties of a novel lectin from Laetiporus sulphureus mushroom

Highlights•Extraction technology for a novel lectin from Laetiporus sulphureus mushroom was optimized.•Its purification technology was established with precipitation and chromatography.•The 52.0 kDa lectin is a novel glycoprotein with a high agglutination activity.•It is rich in aspartic acid and has alpha-helix confirmation without sugar chain.•It has strong stability against sugars, acid and alkali and positive ions.

Regular ArticlePurification and characterization of a novel anticoagulant and fibrinolytic enzyme produced by endophytic bacterium Paenibacillus polymyxa EJS-3

AbstractIntroductionEndophytes may become a new source of thrombolytic agents for thrombosis treatment.Materials and MethodsA novel fibrinolytic enzyme from Paenibacillus polymyxa EJS-3 (PPFE-I) was purified with ammonium sulfate precipitation, hydrophobic chromatography, ion exchange and gel filtration chromatography. The characterization of the enzyme was investigated by means of fibrinolysis plate, hydrolysis of fibrinogen and anticoagulant effect in vitro.ResultsThe fibrinolytic enzyme is purified to homogeneity with a purification of 14.5 fold and a recovery of 3.3%. The enzyme was shown to have a molecular mass of 63.3 kDa by matrix assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS). The optimum temperature and pH value were 37 °C and 7.5, respectively. Results from the fibrinolysis pattern showed that the enzyme rapidly hydrolyzed the Aα-chain of fibrinogen, followed by the Bβ-chains. It also hydrolyzed the γ-chains, but more slowly. It was activated by metal ions such as Zn2+, Mg2+, and Fe2+, but inhibited by Ca2+ and Cu2+. Furthermore, PPFE-I activity was inhibited strongly by PMSF, and it was found to exhibit a higher specificity for the synthetic substrate N-succinyl-Ala-Ala-Pro-Phe-pNA for chymotrypsin, indicating that the enzyme is a chymotrypsin-like serine protease. Additionly, PPFE-I showed a significant anticoagulant effect in vitro.ConclusionThe fibrinolytic enzyme PPFE-I from endophytic bacterium Paenibacillu polymyxa EJS-3 exhibits a profound fibrinolytic activity.

An optimized parallelized SGFD modeling scheme for 3D seismic wave propagation

Highlights•Parallel computation is a common approach to relieve computing intensive problem.•An optimized domain-decomposition scheme is developed to further improve the computation efficiency.•An open-source code package based on the optimized scheme is introduced.

P2P soft security: On evolutionary dynamics of P2P incentive mechanism

AbstractThis paper thoroughly investigates the evolutionary dynamics of soft security mechanism, namely, reciprocity-based incentive mechanism, in P2P systems based on Evolutionary Game Theory (EGT). By soft security mechanism, it means social control mechanisms to overcome peers’ selfish (rational) behaviors, and encourage cooperation in P2P systems. Specifically, there exist three strategies in P2P systems: always cooperative (ALLC), always defect (ALLD) and reciprocator (R). Instead of existing work which take it for granted that, like ALLC users, R users did not bear any information-seeking cost, we assume small reciprocation cost, and study generalized mutation-selection dynamics. Our contributions are threefold: firstly, we prove and illustrate that, in a well-mixed P2P structure, ALLD is the only strict Nash equilibrium; secondly, we infer the specific condition under which evolution dynamics exhibits rock-scissors-paper oscillation in a structured P2P population. That is, the population cycles from ALLD to R to ALLC and back to ALLD; finally, we theoretically illustrate that the intensity of selection plays an important role in the evolutionary dynamics of P2P incentive mechanism. That is, when the intensity of selection is relatively weak and reciprocation cost limits to zero, the time average can be mostly concentrated on reciprocator. In brief, considering the existence of reciprocation cost and the small mutation in P2P incentive mechanisms, unlike existing work, it is impossible to simply achieve the “absolute cooperative” in P2P incentive mechanisms. On the other hand, stochastic evolution in P2P incentive mechanism with finite population and network structure still favor reciprocation.

Experimental and numerical investigation of a CO2 heat pump system for electrical vehicle with series gas cooler configurationÉtude expérimentale et numérique d’un système de pompe à chaleur au CO2 pour véhicule électrique avec configuration de refroidisseur de gaz en série

Highlights•Performance of a novel CO2 heat pump system with Series Gas Cooler (SGC) has been experimentally tested in both Air Conditioning (AC) and Heat Pump (HP) mode.•A numerical model of CO2 SGC HP system has been established and validated with experiment results.•The impacts of ambient temperature, discharge pressure and degree of superheat (DSH) on the HP system has been studied using the numerical model.•A comparison between conventional CO2 system and SGC HP system is carried out based on the model.

Numerical study on heat transfer performance of micro-channel gas coolers for automobile CO2 heat pump systemsÉtude numérique sur les performances de transfert de chaleur de refroidisseurs de gaz à micro-canaux pour les systèmes de pompe à chaleur automobile au CO2

Highlights•A simulation model of automobile CO2 micro-channel gas cooler was developed and validated.•The inlet temperature of refrigerant has a great influence on heating performance of CO2 gas cooler.•Unfavorable air temperature inhomogeneity appears on the airside outlet surface of gas cooler.•Expanding the depth of the gas cooler from 32 to 64 mm can improve the heating capacity by 29%.

Macrophage immunomodulatory activity of the polysaccharide isolated from Collybia radicata mushroom

AbstractPolysaccharides from Collybia radicata mushroom (CRP) possess many functions, such as antiviral, anti-aging and hypolipidemic activities. However, little is known about their immunomodulatory activity. To address this issue, we did a thorough research into their immune effects on murine macrophages. The results showed that the 14942 Da polysaccharide not only obviously improved the proliferation and phagocytosis of macrophages, but also induced the secretion of nitric oxide (NO), inducible nitric oxide synthase (iNOS) and cytokines, such as tumor necrosis factor-α (TNF-α) and interleukin factors (IL-1β, IL-6 and IL-10). At a concentration of 850.0 μg mL−1, the polysaccharide stimulated their proliferation and phagocytosis to 2.1 and 3.4 times, respectively, as compared to the negative group. Meanwhile, it raised the production of NO by inducing iNOS in a concentration-dependent manner. Furthermore, it enhanced the release of these cytokines to multiples from 2.3 to 3.6 times. As an inhibitor of TLR4 (Toll-like Receptor 4), TAK242 suppressed the secretion of NO, iNOS and cytokines above 51%, and ORP acted on the cells mainly via TLR4. Consequently, the polysaccharide has a potent immunomodulatory activity by stimulating macrophages and can be considered as a novel potential immunopotentiator in medical and food industries.

Potential immunomodulatory activities of a lectin from the mushroom Latiporus sulphureus

AbstractThe lectin from Latiporus sulphureus (LSL) was purified by chromatography. Five components were obtained, of which LSL4 was the most effective one to promote cell growth, which increased cell viability to 2.6 times and 0.8 times of negative control and positive control group, so LSL4 with the highest immunomodulatory activity was selected for further identification. In addition, its immune effects on murine macrophages in vitro were evaluated. After LSL4 treatment, cell viability and phagocytic activity were greatly improved, and NO amount could reach about 24.795 ± 1.559 μmol·L−1. The contents of TNF-α and IL-10 were 4.0 and 3.2 times higher than those of the negative control group, and the contents of IL-1β and IL-6 were 2.8 and 4.1 times higher than those of the negative control group, respectively. TAK242 significantly inhibited the secretion of TNF-α, IL-1β, IL-6 and IL-10, with inhibition rates of 53%, 61%, 48% and 54%, respectively. The results showed that 76.0 kD glycoprotein could promote cell proliferation and phagocytosis, and activate cells to release more nitric oxide, nitric oxide synthase and cytokines. The lectin has potential immunopotentiation in functional foods and pharmacology.

Study on the antithrombotic activity of Umbilicaria esculenta polysaccharide

Highlights•The antithrombotic activities of UEP were examined for the first time.•UEP could be a fine inhibition of the intrinsic coagulation systems.•Its inhibition of thrombus formation increased in a dose-dependent manner.•It also caused a dose-dependent increase in tail transection bleeding time.•It had a dose dependent preventive effect against thrombotic death or paralysis.

Genotyping and molecular characteristics of multidrug-resistant Mycobacterium tuberculosis isolates from China

Highlights•We investigated the genetic diversity of multidrug-resistant tuberculosis strains in China.•The ancient Beijing MDR strains were associated with drug resistance.•The modern Beijing MDR strains were more likely to be clustered.

Proteomics approach reveals novel proteins on the surface of malaria-infected erythrocytes☆

AbstractProteins on the surface of parasite-infected erythrocytes (PIESPs) have been one of the major focuses of malaria research due to their role in pathogenesis and their potential as targets for immunity and drug intervention. Despite intense scrutiny, only a few surface proteins have been identified and characterized. We report the identification of two novel surface proteins from Plasmodium falciparum-infected erythrocytes. Surface proteins were fractionated through biotin–streptavidin interaction and analyzed by shotgun proteomics. From a list of 36 candidates, two were selected for further characterization. The surface location of both proteins was confirmed by confocal microscopy using specific antibodies. PIESP1 and PIESP2 are unlikely to be associated with knobs, the protrusions on the parasite-infected erythrocyte (PIE) surface. In contrast to other known PIESPs, such as PfEMP1 and Rifin, these novel proteins are encoded by single copy genes, highly conserved across Plasmodium ssp., making them good targets for interventions with a broad specificity to various P. falciparum isolates.

Gold mineralization in Proterozoic black shales: Example from the Haoyaoerhudong gold deposit, northern margin of the North China Craton

AbstractThe Haoyaoerhudong gold deposit in the northern margin of the North China Craton (NCC) is a large tonnage lower-grade deposit with a reserve of about 148 tons of gold. Gold mineralization is characterized by pyrite and pyrrhotite films and thin veins on the schistosity plane of the Proterozoic black shales. The orebodies, strictly controlled by a near EW-trending shear zone, are stratabound within carbonaceous phyllite and andalusite-garnet schist of the Bilute Formation. Hydrogen and oxygen isotopic data show that the ore-forming fluid was derived from a magmatic source and mixed with meteoric water. Sulfur and carbon isotope data indicate that most of the sulfur and carbon came from the black shale strata. Well-defined biotite Ar-Ar plateau age and inverse isochron age show that the deposit formed at ca. 270Ma, which suggests a probable link between Hercynian magmatism and gold mineralization. Studies on regional geology, ore geology, isotope geochemistry, and ore-forming age substantiate a complex evolutionary history of the deposit. The Proterozoic black shales rich in gold, sulfur, and organic matter, which were deposited in the Proterozoic continental margin rifts, comprised the source bed for gold mineralization. EW-ENE-structures, products of Palaeozoic orogenic process, provided pathways and mineralization space for ore-forming fluids. Hercynian tectono-magmatism and subsequent hydrothermal events remobilized gold and drove the ore-forming fluids to dilatational fracture zones. Related to postcollisional magmatic hydrothermal events, the Haoyaoerhudong gold deposit is considered as a special type of orogenic gold deposit formed in the compression–extension transition stage.

Back | Next (Page 1 of 3)
Advertisement
Join Copernicus Academic and get access to over 12 million papers authored by 7+ million academics.
Join for free!

Contact us