In the cascaded H-bridge inverter(CHBI)with supercapacitor and dc-dc stage,inherent second-order harmonic power flows through each submodule(SM),causing fluctuations in both the dc-link voltage and the dc-dc *** exist...
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In the cascaded H-bridge inverter(CHBI)with supercapacitor and dc-dc stage,inherent second-order harmonic power flows through each submodule(SM),causing fluctuations in both the dc-link voltage and the dc-dc *** exist limitations in handling these fluctuations at variable output frequencies when employing proportional-integral(PI)control to the dc-dc *** paper aims to coordinately control these second-order harmonic voltage and current fluctuations in the *** presented method configures a specific second-order harmonic voltage reference,equipped with a maximum voltage fluctuation constraint and a suitable phase,for the dc-dc stage.A PI-resonant controller is used to track the configured *** allows for regulating the second-order harmonic fluctuation in the average dc-link voltage among the SMs within a certain ***,the second-order harmonic fluctuation in the dc-dc current can also be *** and experimental results demonstrate the effectiveness of the presented method.
Multiform fractures have a direct impact on the mechanical performance of rock *** accurately identify multiform fractures,the distribution patterns of grayscale and the differential features of fractures in their nei...
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Multiform fractures have a direct impact on the mechanical performance of rock *** accurately identify multiform fractures,the distribution patterns of grayscale and the differential features of fractures in their neighborhoods are *** on this,a multiscale processing algorithm is *** multiscale process is as *** the neighborhood of pixels,a grayscale continuous function is constructed using bilinear interpolation,the smoothing of the grayscale function is realized by Gaussian local filtering,and the grayscale gradient and Hessian matrix are calculated with high *** small-scale blocks,the pixels are classified by adaptively setting the grayscale threshold to identify potential line segments and *** the global image,potential line segments and mini-fillings are spliced together by progressing the block frontier layer-by-layer to identify and mark multiform *** accuracy of identifying multiform fractures is improved by constructing a grayscale continuous function and adaptively setting the grayscale thresholds on small-scale *** the layer-by-layer splicing algorithm is performed only on the domain of the 2-layer small-scale blocks,reducing the *** using rock mass images with different fracture types as examples,the identification results show that the proposed algorithm can accurately identify the multiform fractures,which lays the foundation for calculating the mechanical parameters of rock masses.
Organic photovoltaic devices(OPVs)are emerging as a promising renewable energy source for the *** unique advantages,such as semitransparency,light weight,superior flexibility,and low cost,enable a wide range of ***,co...
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Organic photovoltaic devices(OPVs)are emerging as a promising renewable energy source for the *** unique advantages,such as semitransparency,light weight,superior flexibility,and low cost,enable a wide range of ***,compared to silicon-based photovoltaics,OPVs still face challenges for further improving their ***,there is a need to explore their potential of multi-functionality for practical application in various *** review summarizes the recent achievements in optimizing device performance and enhancing power-conversion efficiency,particularly via tuning the intermolecular interaction to reduce the electron-vibration coupling and non-radiative charge recombination(denoted as the“dilution effect”).Moreover,the representative development of ultra-thin Ag transparent electrode-based OPVs with multi-functional capabilities(such as semitransparency,flexibility,stretchability,and better aesthetics)has also been ***,this review aims to provide a broad landscape on the recent development of OPV and to unlock the full potential of OPVs.
The rapid spread of viral zoonoses can cause severe consequences,including huge economic loss,public health problems or even global crisis of *** detection technology plays a very important role in the prevention and ...
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The rapid spread of viral zoonoses can cause severe consequences,including huge economic loss,public health problems or even global crisis of *** detection technology plays a very important role in the prevention and control of such *** rapid and accurate detection of the pathogens of the diseases can directly lead to the early report and early successful control of the *** the advantages of being easy to use,fast,portable,multiplexing and cost-effective,semiconductor biosensors are kinds of detection devices that play an important role in preventing epidemics,and thus have become one of the research ***,we summarized the advances of semiconductor biosensors in viral zoonoses *** discussing the major principles and applications of each method for different pathogens,this review proposed the directions of designing semiconductor biosensors for clinical application and put forward perspectives in diagnostic of viral zoonoses.
Background Broilers stand out as one of the fastest-growing livestock globally,making a substantial contribution to animal meat ***,the molecular and epigenetic mechanisms underlying the rapid growth and development o...
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Background Broilers stand out as one of the fastest-growing livestock globally,making a substantial contribution to animal meat ***,the molecular and epigenetic mechanisms underlying the rapid growth and development of broiler chickens are still *** study aims to explore muscle development patterns and regulatory networks during the postnatal rapid growth phase of fast-growing *** measured the growth performance of Cornish(CC)and White Plymouth Rock(RR)over a 42-d *** muscle samples from both CC and RR were randomly collected at day 21 after hatching(D21)and D42 for RNA-seq and ATAC-seq library *** The consistent increase in body weight and pectoral muscle weight across both breeds was observed as they matured,with CC outpacing RR in terms of weight at each stage of *** expression analysis identified 398 and 1,129 genes in the two dimensions of breeds and ages,respectively.A total of 75,149 ATAC-seq peaks were annotated in promoter,exon,intron and intergenic regions,with a higher number of peaks in the promoter and intronic *** age-biased genes and breed-biased genes of RNA-seq were combined with the ATAC-seq data for subsequent *** results spotlighted the upregulation of ACTC1 and FDPS at D21,which were primarily associated with muscle structure development by gene cluster ***,a noteworthy upregulation of MUSTN1,FOS and TGFB3 was spotted in broiler chickens at D42,which were involved in cell differentiation and muscle regeneration after injury,suggesting a regulatory role of muscle growth and *** This work provided a regulatory network of postnatal broiler chickens and revealed ACTC1 and MUSTN1 as the key responsible for muscle development and *** findings highlight that rapid growth in broiler chickens triggers ongoing muscle damage and subsequent *** findings provide a foundation for future research to i
This study addresses the challenge of detecting replay attacks within the stable states in vehicular *** accordance with the zonotopic set-membership filtering algorithm,the detection of attacks is conducted by evalua...
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This study addresses the challenge of detecting replay attacks within the stable states in vehicular *** accordance with the zonotopic set-membership filtering algorithm,the detection of attacks is conducted by evaluating the presence of an intersection between the prediction set and the measurement *** the stable state of the vehicle platoon,replay attacks may potentially bypass attack detectors based on the set-membership filtering *** address the replay attack false negative issue,a watermark design scheme based on Markovian-Bernoulli processes is proposed,and the impacts of this watermark design on system performance and attack detection capability are *** addressing pertinent optimization problems,effective parameters selection for the watermark is achieved,striking a balance between security and control *** effectiveness of this method is validated through numerical simulations.
Hydrological processes of mountainous watersheds commonly impact water resource supply in downstream areas. To better understand how re-vegetation affects the different hydrological pathways of watersheds, we investig...
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Hydrological processes of mountainous watersheds commonly impact water resource supply in downstream areas. To better understand how re-vegetation affects the different hydrological pathways of watersheds, we investigated their change at various temporal scales for the Xiaoluan River watershed, a typical meso-scale watershed featuring a plateau-mountain transition topography in northern china. For the non-growing season from 2006 to 2020, the groundwater discharge of the watershed and the wetting of the watershed in terms of the Horton Index significantly increased, and the recession process in terms of the recession coefficient (k) was considerably prolonged. We suggest that re-vegetation and snowmelt were responsible for this change, but they affected the hydrological processes differently. That is, re-vegetation might improve the water storage capacity of the shallow soil layers of the watershed, thereby enhancing the capacity of groundwater recharge and discharge. Meanwhile, snowmelt may provide available water for recharging and discharging the watershed. Because reforestation progresses and global climate change continues, more complex hydrological processes are to be expected. Therefore, continuous monitoring and detailed investigations of subsurface hydrological processes will be necessary for adaptive watershed management.
Low-dimensional crystal structures with long lifetime phosphorescence hold great potential in biological imaging, sensors, and micro/nanophotonics. However, the high-efficient phosphorescence is still scarce on the mi...
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Low-dimensional crystal structures with long lifetime phosphorescence hold great potential in biological imaging, sensors, and micro/nanophotonics. However, the high-efficient phosphorescence is still scarce on the micro/nanoscale due to the strong nonradiative transitions and quenching of long-lifetime triplet state caused by the large specific surface area. Herein, a one doped microstructure with high quantum yield phosphorescence is reported by doping an electron-acceptor (guest) into an electron-donor (host). The formation of a triplet exciplex between the donor and acceptor enables the doped microcrystals to display highly efficient long-lived emission with 63.1% quantum yield, while the phosphorescence emissions of microstructures from a neat donor and acceptor are negligible. The emission mechanism in relation to the exciplex is elaborated from temperature-dependent luminescence behavior and theoretical calculation. This work provides an effective strategy for achieving efficient long-lived emissions at the micro-scale, which will accelerate the research and development of advanced miniaturized functional devices. One organic microstructure with high-efficiency (63.1%) room-temperature phosphorescence is achieved through forming a triplet exciplex in a host-guest doping system. Along with the increase in temperature, the emission intensity of the doped microstructures decreases at the phosphorescent peak of the donor first and then increases at a red-shift exciplex emission, confirming the formation of triplet exciplex between donor and ***
Metal smelting have brought severe metal(loid)s contamination to the *** distribution and pollution source analysis for soil metal(loid)s in an abandoned lead/zinc smelter were *** results showed that soil was contami...
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Metal smelting have brought severe metal(loid)s contamination to the *** distribution and pollution source analysis for soil metal(loid)s in an abandoned lead/zinc smelter were *** results showed that soil was contaminated heavily withmetal(loid)*** mean of lead(Pb),arsenic(As),cadmium(Cd),mercury(Hg)and antimony(Sb)content in topsoil is 9.7,8.2,5.0,2.3,and 1.2 times higher than the risk screening value for soil contamination of development land of china(GB36600-2018),*** ismainly enriched in the 0–6mdepth of site soil while As and Pbmainly deposited in the 0–*** spatial distribution of soil metal(loid)s is significantly correlated with the pollution source in the different functional areas of ***,Hg,Sb,Pb and copper(Cu)were mainly distributed in pyrometallurgical area,while Cd,thallium(Tl)and zinc(Zn)was mainly existed in both hydrometallurgical area and raw material storage *** metal(loid)s pollution sources in the abandoned smelter are mainly contributed to the anthropogenic sources,accounting for 84.5%.Specifically,Pb,Tl,As,Hg,Sb and Cumainly from atmospheric deposition(55.9%),Cd and Zn mainly from surface runoff(28.6%),While nickel(Ni)mainly comes from parent material(15.5%).The results clarified the spatial distribution and their sources in different functional areas of the smelter,providing a new thought for the risk prevention and control of metal(loid)s in polluted site soil.
作者：
Weike DengSheng LongJiliang JingDepartment of Physics
Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Educationand Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China Center for Gravitation and Cosmology
College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China
We extend our research on the energy flux and waveform characteristics of gravitational waves generated by merging nonspinning binary black holes through self-consistent effective one-body theory to include binary sys...
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We extend our research on the energy flux and waveform characteristics of gravitational waves generated by merging nonspinning binary black holes through self-consistent effective one-body theory to include binary systems with slowly spinning black ***,we decompose the equation for the null tetrad component of the gravitationally perturbed Weyl tensorψ_4~B into radial and angular parts,leveraging the second-order approximation of the rotation parameter ***,we derive an analytical solution for the radial equation and observe that our results are contingent upon the parameters a_(2),a_(3),and a,which represent the second-and third-order correction parameters,***,we calculate the energy flux,the radiation-reaction force and the waveform for the“plus”and“cross”modes of the gravitational waves generated by merging slowly spinning binary black holes.
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