Capital Normal University
Recent publications
Let G be the automorphism group of an orientably regular embedding of a connected simple graph of order p3, where p is a prime. It was shown in [19] that except for the case when p=2 and G=S4, G contains a normal Sylow p-subgroup P of order pk where k∈{3,4,5}, while such embeddings with k=5 were determined. In this paper, a further classification is achieved for all such embeddings with k=3.
In Traditional Chinese Medicine (TCM), tongue diagnosis is essential for symptom differentiation and treatment selection. Compared with traditional tongue diagnostic instruments, deploying a tongue diagnosis system on mobile devices is more convenient to monitor general health and facilitates the development of telemedicine. However, limited by both the quality and quantity of tongue images taken by mobile devices, extracting tongue features of the images maintains a great challenge. In this paper, we present a tongue feature extraction method on mobile devices, containing a high-accuracy tongue segmentation method based on Moment Invariants with Data Augmentation (DAMI) and an efficient and lightweight feature classification model with an attention mechanism. Meanwhile, we construct a novel tongue image dataset from mobile devices for extracting tongue features, significantly, first including sublingual images which are beneficial to extracting sublingual vein features. Extensive experiments on two datasets demonstrate the effectiveness and robustness of our method. Furthermore, our method greatly reduces the computing and storage demands compared with other current methods, providing a good prerequisite for deployment on mobile devices. Finally, to demonstrate the potential application of our proposed method, we develop a TCM intelligence tongue diagnosis application, which can be accessed through the WeChat Mini Program or web version, exhibiting its great potential in clinical diagnosis and health monitoring.
The well-known q,t-Catalan sequence has two combinatorial interpretations as weighted sums of ordinary Dyck paths: one is Haglund's area-bounce formula, and the other is Haiman's dinv-area formula. The zeta map was constructed to connect these two formulas: it is a bijection from ordinary Dyck paths to themselves, and it takes dinv to area, and area to bounce. Such a result was extended for k-Dyck paths by Loehr. The zeta map was extended by Armstrong-Loehr-Warrington for a very general class of paths. In this paper, we extend the dinv-area-bounce result for k→-Dyck paths by: i) giving a geometric construction for the bounce statistic of a k→-Dyck path, which includes the k-Dyck paths and ordinary Dyck paths as special cases; ii) giving a geometric interpretation of the dinv statistic of a k→-Dyck path. Our bounce construction is inspired by Loehr's construction and Xin-Zhang's linear algorithm for inverting the sweep map on k→-Dyck paths. Our dinv interpretation is inspired by Garsia-Xin's visual proof of dinv-to-area result on rational Dyck paths.
One of the essential works of the tunnel maintenance department is to inspect and maintain the electricity transmission system (ETS). Tunnel inspection with a mobile laser system (MLS) can automate the traditionally manual surveys. In this study, we proposed a step-wise method for automatically extracting ETS in MLS data. First, in the approximate extraction stage, we used edge-based and fitting-based segmentation algorithms to remove the ground and lining, respectively. Then, in the precise extraction stage, power transmission lines were accurately extracted at the object-level using a proposed spherical-stepping-cluster algorithm, and the supporting fixtures were extracted using density information and connection characteristics. The proposed method was validated through experiments on a batch of point cloud markings with ground-truth data and comparisons with existing methods. The average F-score for the datasets was 94.2 %, indicating that this research provides a new paradigm for extracting tunnel ETS.
The rational construction and planning of coastal cities has always been an important direction for urban development. The geological environment and sea level changes of the coastline are closely related to the safety of people’s property. The interaction of reclamation projects and the changes brought about by ocean hydrodynamic conditions have a significant impact on the coastal zone. The geological environment has had a serious impact. Based on the environmental geological survey and evaluation results of the coastal zone in the Caofeidian New Area in recent years, this paper focuses on the land restoration of coastal cities by analyzing changes in coastlines and lake beaches, changes in tidal currents, coastal erosion and alluvial layers, storm surges and sea level changes. The interaction and impact of reclamation and the geological environment, and corresponding prevention and control suggestions for major issues such as storm surge and sea level rise, and scientific guidance for reasonable planning and disaster warning of coastal cities.
The current research examined the similarities and differences in parenting behaviors between 1090 Dutch and 2339 urban Chinese mothers with 1- to 4-year olds and investigated to what extent group differences in parenting stress, proportions of only children, and maternal working hours explain cultural variations in parenting behaviors. Thirteen parenting behaviors were assessed using the Comprehensive Early Childhood Parenting Questionnaire. Parenting stress was measured by 10 items selected from the Parenting Stress Index-Short Form. Mothers also reported whether the child was an only child and how many hours they worked per week. Results showed that Dutch mothers and urban Chinese mothers had similar levels of sensitivity, affection, using toys, verbal punishment, and positive discipline. For the other 8 parenting behaviors on which cultural variations were found, a mediational model, examining whether parenting stress, the only-child status, and maternal working time could explain cultural differences in parenting behaviors, was investigated. Compared to Dutch mothers, urban Chinese mothers had higher parenting stress, worked longer hours, and were more likely to have an only child. The group differences in involvement in activities, exposure, over-reactivity, and physical punishment were fully explained by cultural differences in parenting stress and proportions of only children. These mediators, however, only explained a part of the cultural differences in responsiveness, psychological control, consistency, and laxness, showing that Dutch mothers were still more consistent in enforcing rules and less lax in parenting, whereas urban Chinese mothers were still slightly more responsive to children's signals, but also more psychologically controlling.
Plant secondary metabolites (PSMs) play key roles in plant survival by regulating plant physiological processes, helping plants adapt to their habitats, and protecting plants against pathogenic attacks and environmental stress. In addition, these valuable natural compounds have potential pharmacological and toxicological effects on humans. Understanding the complex biosynthetic processes of PSMs is crucial for sustainable bioeconomy and accomplishing sustainable development goals (SDGs). However, because of the complexity of plant secondary metabolic systems, identifying the function of related enzyme-encoding genes is not sufficient for this purpose. To study these sophisticated processes holistically, it is imperative to implement an integrative approach combining multiomics data to highlight the relationships between the underlying biological activities and their functions. In this chapter, we provide an overview of PSMs, including their classification, biosynthetic pathways, and functions, as well as relevant omics-based approaches, multiomics data integration tools and methods, and applications. Conversely, with advancements in multiomics technologies and research, selecting appropriate multiomics research methods and storage, management, and comparison of different types of datasets obtained from different platforms will be the major challenge in the future.
In this paper, we consider the weak solutions of compressible Navier-Stokes-Landau-Lifshitz-Maxwell (CNSLLM) system for quantum fluids with a linear density dependent viscosity in a 3D torus. By introducing the cold pressure Pc, we prove the global existence of weak solutions with the pressure P + Pc, where P = Aργ with γ ≥ 1. Our main result extends the one in [13] on the quantum Navier-Stokes equations to the CNSLLM system.
We obtain the e-positivity or non-e-positivity of some spider graphs with three legs, the positivity classification of all broom graphs, and the positivity classification of most double broom graphs. The methods involve extracting particular e-coefficients of the chromatic symmetric function of these graphs with the aid of Orellana and Scott’s triple-deletion property, and using the combinatorial formula of Schur coefficients by examining certain special rim hook tabloids. We conjecture that a spider S(a,b,c) with c≥3 is e-positive if and only if it is S(8,5,3) or S(14,9,5).
High levels of fine particulate matter (PM2.5) pose a severe air pollution challenge in China. Both land use changes and anthropogenic emissions can affect PM2.5 concentrations. Only a few studies have addressed the long-term impact of land surface changes on PM2.5 in China. We conducted a comprehensive analysis of PM2.5 trends over China using the Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2) during 1980–2020. The monthly mean PM2.5 concentrations of MERRA-2 were evaluated across mainland China against independent surface measurements from 2013 to 2020, showing a good agreement. For the trend analysis, China was subdivided into six regions based on land use and ambient aerosols types. Our results indicate an overall significant PM2.5 increase over China during 1980–2020 with major changes in-between. Notwithstanding continued urbanization and associated anthropogenic activities, the PM2.5 reversed to a downward trend around 2007 over most regions except for the part of China that is most affected by desert dust. Statistical analysis suggests that PM2.5 trends during 1980–2010 were associated with urban expansion and deforestation over eastern and southern China. The trend reversal around 2007 is mainly attributed to Chinese air pollution control measures. A multiple linear regression analysis reveals that PM2.5 variability is linked to soil moisture and vegetation. Our results suggest that land use and land cover changes as well as pollution controls strongly influenced PM2.5 trends and that drought conditions affect PM2.5 particularly over desert and forest regions of China. This work contributes to a better understanding of the changes in PM2.5 over China.
IRON-REGULATED TRANSPORTER 1 (IRT1) is critical for iron uptake in roots, and its exocytosis to the plasma membrane (PM) is regulated by the iron status sensed by the histidine-rich domain (HRM). However, studies on the fate of IRT1 after fusion with PM in response to iron conditions are still limited. In this study, we found that K165 and K196 regulate the monoubiquitination of MxIRT1 (mUb-MxIRT1), which acts as a receptor delivering signals from HRM to downstream effectors such as clathrin to determine the fate of MxIRT1. Iron supply led MxIRT1 in the PM to monoubiquitin-dependent endocytosis which could be inhibited by endocytosis inhibitor TyrA23 or in the double site-directed mutant K165/K196R. Subsequently, the endocytosis pathway to the vacuole was inhibited by vacuolar protease inhibitor Leupeptin in excessive iron conditions and the inability of being able to respond to iron change, indicated by the protein accumulating in the PM, contributed to iron toxicity in K165/K196R transgenic Arabidopsis. With iron availability decreasing again, MxIRT1 could dock close to the PM waiting for to be recycled. Another monoubiquitination site, K26, was necessary for MxIRT1 Endoplasmic Reticulum (ER) export as site-directed mutant K26R lost the ability of PM targeting, and co-localized with the COPII subunit of the coat protein OsSec24. Therefore, after K26-directed ER export and iron-induced PM fusion, mUb-MxIRT1 determines subsequent vacuolar degradation or recycling to the PM via endocytosis for maintaining iron homeostasis.
Light initiates chloroplast biogenesis in Arabidopsis by eliminating PHYTOCHROME-INTERACTING transcription FACTORs (PIFs), which in turn de-represses nuclear photosynthesis genes, and synchronously, generates a nucleus-to-plastid (anterograde) signal that activates the plastid-encoded bacterial-type RNA polymerase (PEP) to transcribe plastid photosynthesis genes. However, the identity of the anterograde signal remains frustratingly elusive. The main challenge has been the difficulty to distinguish regulators from the plethora of necessary components for plastid transcription and other essential chloroplast functions, such as photosynthesis. Here, we show that the genome-wide induction of nuclear photosynthesis genes is insufficient to activate the PEP. PEP inhibition is imposed redundantly by multiple PIFs and requires PIF3’s activator activity. Among the nuclear-encoded components of the PEP holoenzyme, we identify four light-inducible, PIF-repressed sigma factors as anterograde signals. Together, our results elucidate that light-dependent inhibition of PIFs activates plastid photosynthesis genes via sigma factors as anterograde signals in parallel with the induction of nuclear photosynthesis genes.
Background ADHD and Chinese developmental dyslexia (DD) have a very high comorbidity rate; however, which cognitive deficits characterize the comorbidity and when they occur during cognitive processing are still under debate. Methods Rapid automatic naming (RAN) tasks with eye-movement tracking were conducted with 75 children who were typically developing, had comorbid ADHD and DD, had only ADHD, and had only DD. Results The clinical groups had longer first fixation durations than the control for RAN digits. Temporal eye-movement measures, such as gaze duration and total reading time, were found to vary between the comorbidity and ADHD groups. Spatial eye-movement measures, such as regression probability and incoming saccade amplitude, differed between the comorbidity and DD groups. Conclusions These results indicate that investigation with eye-movement measures combined with RAN tasks can strengthen the understanding of the pathogenesis of comorbid ADHD and DD.
Terahertz (THz) near-field microscopy retains the advantages of THz radiation and realizes sub-wavelength imaging, which enables applications in fundamental research and industrial fields. In most THz near-field microscopies, the sample surface must be approached by a THz detector or source, which restricts the sample choice. Here, a technique was developed based on an air-plasma dynamic aperture, where two mutually perpendicular air-plasmas overlapped to form a cross-filament above a sample surface that modulated an incident THz beam. THz imaging with quasi sub-wavelength resolution (approximately λ /2, where λ is the wavelength of the THz beam) was thus observed without approaching the sample with any devices. Damage to the sample by the air-plasmas was avoided. Near-field imaging of four different materials was achieved, including metallic, semiconductor, plastic, and greasy samples. The resolution characteristics of the near-field system were investigated with experiment and theory. The advantages of the technique are expected to accelerate the advancement of THz microscopy.
Since the (β-deformed) hermitian one-matrix models can be represented as the integrated conformal field theory (CFT) expectation values, we construct the operators in terms of the generators of the Heisenberg algebra such that the constraints can be derived by inserting the constructed operators into the integrated expectation values. We also obtain the second order total derivative operators associating with the derived constraint operators and analyze their properties. We explore the intrinsic connection between the derived constraint operators and W-representations of some matrix models. For the Gaussian hermitian one-matrix model in the external field and β-deformed N×N complex matrix model, we investigate the superintegrability and derive the corresponding character expansions from their W-representations. Moreover a conjectured formula for the averages of Jack polynomials in the literature is proved.
Seagrass beds offer unique and vital ecological services as an important blue carbon ecosystem in coastal wetlands. Zostera japonica is an intertidal seagrass species native to eastern Asia and is one of the most widely distributed seagrass species in China. However, little is known on the long-term variations of Z. japonica extents. Automatic mapping method for Z. japonica seagrass beds is in urgent need to fill this knowledge gap. In this study, we proposed a new SeaGrass Index (SGI) for automatic and rapid mapping of Z. japonica based on time-series Landsat satellite imagery, aiming to alleviate the influence of tidal inundation and enhance the separability from other coastal cover types. The SGI considers both spectral and phenological characteristics of Z. japonica, as well as the spatial location of Z. japonica. We took the Yellow River Delta (YRD), China as our study area, where Z. japonica was first discovered and reported in 2015. Based on SGI, Z. japonica extents during 1985–2018 were extracted using multi-Otsu thresholding algorithm. Accuracy assessments based on field investigations and high-resolution imagery showed that SGI successfully separated seagrass beds from other cover types, especially intertidal salt marshes, with overall accuracies > 95%, producer’s accuracies > 90% and user’s accuracies > 94%. Our study provides the first long-term maps of seagrass beds in YRD. The area of Z. japonica showed large variations during 1985–2018, ranging from 149 ha in 2005–2006 to 1302.9 ha in 2011–2012. The spatial distribution of Z. japonica varied with the morphological change of the estuary caused by river channel shifts. Since 2011, Z. japonica seagrass beds have undergone area degradation due to the invasion of S. alterniflora. The area was only 332.3 ha in 2017–2018. Coastal erosion and extreme climate events such as drought and typhoon might also explain degradation of seagrass beds in YRD. We expect that the SGI will advance automatic and rapid mapping methods for intertidal seagrass beds, and the Z. japonica maps will provide a baseline data for restoration and management of seagrasses at regional scale.
Introduction: Diosgenin is a natural steroidal compound with reported antidiabetic and many other protective properties. This study aimed to explore the protective effect of diosgenin on high-glucose (HG)-induced retinal pigment epithelial cells. Methods: HG-induced ARPE-19 cells were considered as a cell model of diabetic retinopathy (DR). The viability and apoptosis of ARPE-19 cells induced by HG treated with either diosgenin or Compound C (CC; dorsomorphin) were detected by Cell Counting Kit-8 assay and flow cytometric analysis. The expression of apoptosis-related proteins, inflammation-related proteins, and AMPK/Nrf2/HO-1 pathway-related proteins was detected by western blotting. The levels of inflammatory cytokines and detection of oxidative stress indexes were performed using the appropriate assay kits. The messenger RNA expression of inflammatory cytokines was detected by real-time quantitative polymerase chain reaction. Results: There was no obvious effect of diosgenin on the viability of ARPE-19 cells and the viability of ARPE-19 cells was significantly reduced after HG induction. However, diosgenin increased the viability, inhibited the apoptosis, and reduced the inflammatory response and oxidative stress of ARPE-19 cells induced by HG. In addition, diosgenin could activate the AMPK/Nrf2/HO-1 pathway. CC, an AMPK inhibitor, could reverse the above changes caused by diosgenin treatment in ARPE-19 cells induced by HG. Conclusions: Diosgenin could protect ARPE-19 cells from inflammatory damage and oxidative stress induced by HG, by activating the AMPK/Nrf2/HO-1 pathway.
The impact of the uplifted Tibetan Plateau on the East Asian monsoon (EAM) evolution is not an uncontroversial topic. Disentangling complex paleoclimatic signals derived from solar insolation, global ice volume, and the rise of Tibetan Plateau in the EAM domain is challenging because of the paucity of continuous Quaternary sedimentary records shed from the Tibetan Plateau. The 260-m-thick Xining loess deposits in the northeastern Tibetan Plateau (NETP) with ultra-high average accumulation rate of ∼23 cm/ka during 0.2–1.3 Ma provide an excellent opportunity to delineate the long-term influence of the uplifted Tibetan Plateau on paleoclimatic variations in the western margin of the EAM. High-resolution grain size and mineral magnetic analyses for this unique record reveal a much more significant long-term increasing trend of the East Asian winter monsoon strength and aridification compared with those of typical loess records on the Chinese Loess Plateau, confirming that the uplifted Tibetan Plateau may play an important part in enhancing the EAM circulation and aridity of Asian interior under global cooling. It is further proposed that the negative correlation between physical erosion and chemical weathering in the NETP does not contradict the prevailing uplift-weathering hypothesis, but probably suggests a strong climate-silicate-weathering feedback in this tectonically active region. This result provides robust evidence that the existence of the NETP and adjacent topography exerts a profound impact on the irreversible intensification of Asian interior aridity.
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3,701 members
Ping Wei
  • Department of Psychology
Hengjian Cui
  • School of Mathematical Sciences
Tao Hu
  • School of Mathematical Sciences
Cheng Sun
  • College of Life Sciences
Yongbo Wang
  • College of Resource Environment and Tourism
Beijing, China