Yan Li

The strongly enhanced electron–electron interactions in semiconducting moiré superlattices formed by transition metal dichalcogenide heterobilayers have led to a plethora of intriguing fermionic correlated states. Meanwhile, interlayer excitons in a type II aligned heterobilayer moiré superlattice, with electrons and holes separated in different layers, inherit this enhanced interaction and suggest that tunable correlated bosonic quasiparticles with a valley degree of freedom could be realized. Here we determine the spatial extent of interlayer excitons and the band hierarchy of correlated states that arises from the strong repulsion between interlayer excitons and correlated electrons in a WS2/WSe2 moiré superlattice. We also find evidence that an excitonic Mott insulator state emerges when one interlayer exciton occupies one moiré cell. Furthermore, the valley polarization of the excitonic Mott insulator state is …

To address the issue of instrument performance degradation of Fourier transform infrared (FTIR) spectrometers caused by different types of environmental signal noise, an adaptive filtering algorithm, which can update filtering parameters in real-time based on different environmental noise levels, is proposed in this work. The basic principle and implementation process of the algorithm are theoretically deduced, and the filtering effect under different filtering parameters is analyzed. Then, the proposed filtering algorithm is used to filter the measured spectral data, and the spectral signal-to-noise ratio (SNR) of different filtering methods is compared and analyzed. The results show that the SNRs of the adaptive filtering algorithm in 2100-2200 cm-1 and 2500-2600 cm-1 bands are 1.29 times and 1.13 times those of the traditional hardware filtering, respectively, indicating that the adaptive filtering algorithm proposed can effectively improve SNR of FTIR spectrum and the performance index of FTIR instrument.

A09. 00005: Layer-hybridized correlated insulating states in a WS 2/WSe 2 moiré superlattice

D09. 00005: Oral: Quadrupolar excitons and hybridized interlayer Mott insulator in a trilayer moiré superlattice

A09. 00003: Oral: Evidence for excitonic Mott insulator in WS 2/WSe 2 moiré superlattice

The enhanced Coulomb interaction in two-dimensional semiconductors leads to tightly bound electron–hole pairs known as excitons. The large binding energy of excitons enables the formation of Rydberg excitons with high principal quantum numbers (n), analogous to Rydberg atoms. Rydberg excitons possess strong interactions among themselves as well as sensitive responses to external stimuli. Here, we probe Rydberg exciton resonances through photocurrent spectroscopy in a monolayer WSe2 p–n junction formed by a split-gate geometry. We show that an external in-plane electric field not only induces a large Stark shift of Rydberg excitons up to quantum principal number 3 but also mixes different orbitals and brightens otherwise dark states such as 3p and 3d. Our study provides an exciting platform for engineering Rydberg excitons for new quantum states and quantum sensing.

In order to solve the problem of quantitative risk assessment of vapor cloud explosion accident under the condition of urban gas pipe network leakage, a grid risk assessment method was proposed. Firstly, the influence factors of pipeline failure and the loss type of vapor cloud explosion caused by pipeline leakage were analyzed comprehensively, and the risk value of the center point of the grid was obtained by multiplying the failure probability of the pipeline and the monetary quantified value of the consequence loss in the grid after the vapor cloud explosion caused by leakage at a certain point of the pipeline. Then, based on the principle of superposition field, the risk value of each point in the pipeline segment that had an impact on the center point of the grid was coupled and superimposed to obtain the total risk value of each center point of the grid, and then the risk contour line of the evaluation area was drawn. Finally, the method was applied to a field to draw the risk contour line of vapor cloud explosion of gas pipe network leakage in a certain area. According to the risk acceptability criterion, the evaluation area was divided into special, key and general protection areas, and the corresponding protection area scope was obtained. The results show that the method can accurately evaluate the risk of vapor cloud explosion accident of urban gas pipe network leakage, and make regional risk division more refined and visual than traditional methods, which is helpful to improve the utilization rate of social security protection materials.

The purpose of this paper is to review the relationship between dietary inflammatory index and mental disorders, so as to provide references for nutritional interventions for patients with mental disorders. The high disability rate and intractability of mental illness bring huge economic burden and medical pressure to patients' families and society. Dietary nutrition is crucial to the rehabilitation of mental illness. As a new type of index to measure food pro-inflammatory index, dietary inflammatory index is closely related to the occurrence and development of mental illness. Therefore, this paper reviews the development, calculation and correlation with mental illness of dietary inflammatory index.

Transition metal dichalcogenide (TMDC) moiré superlattices, owing to the moiré flatbands and strong correlation, can host periodic electron crystals and fascinating correlated physics. The TMDC heterojunctions in the type-II alignment also enable long-lived interlayer excitons that are promising for correlated bosonic states, while the interaction is dictated by the asymmetry of the heterojunction. Here we demonstrate a new excitonic state, quadrupolar exciton, in a symmetric WSe2-WS2-WSe2 trilayer moiré superlattice. The quadrupolar excitons exhibit a quadratic dependence on the electric field, distinctively different from the linear Stark shift of the dipolar excitons in heterobilayers. This quadrupolar exciton stems from the hybridization of WSe2 valence moiré flatbands. The same mechanism also gives rise to an interlayer Mott insulator state, in which the two WSe2 layers share one hole laterally confined in one …

In order to solve the problems of asymmetry between supply and demand of data science talents and slow construction of discipline system, this study analyses 85 texts of curriculum system of big data management and application majors collected through social network analysis, and at the same time, constructs TOPSIS-LDA model of job qualities based on more than 10,000 job competence demands of the big data industry in 2 mainstream recruitment websites, and draws the focus of attention and logical links of talent cultivation and talent demand side. The focus of attention and logical links of talent demand side were obtained. Finally, based on BERT-LSTM-CRF depth model, entity extraction was carried out on data science classic books and thesis texts, and the knowledge map was constructed for the big data management and application speciality in combination with the logical links of supply and demand …

@# Objective To investigate the titer stability of the harvest solution of severe acute respiratory syndrome coronavirus2 (SARS-CoV-2) at 2~ 8℃ and the inactivation effect of β-propiolactone inactivator on the virus. Methods Three batches of SARS-CoV-2 harvest solution (batch numbers202111001, 202111002 and 202111003) were stored at 2~ 8℃ for 12 d and sampled every 3 d (0, 3, 6, 9 and 12 d) for detection of the titers by Karber method; Three batches of virus harvest solution equilibrated overnight at 2~ 8℃ were inactivated by adding β-propiolactone at a volume fraction of 1∶ 4 000 and detected for the titers at different inactivation time points (0, 0.5, 1, 1.5, 2, 3, 4, 8, 16 and 24 h), of which samples inactivated for 8, 16 and 24 h were taken for inactivation verification, and samples inactivated for 24 h were observed by transmission electron microscope. Results The titers of SARS-CoV-2 decreased with the prolongation of storage time at 2~ 8℃, which showed no obvious decrease during 0~ 3 d, while decreased from the initial 7.75, 6 and 7.5 lgCCID_ (50)/mL to5. 75, 4.625 and 6.25 lgCCID_ (50)/mL on day 12, indicating that the virus activity showed a gradual decrease trend at 2~ 8℃; With the inactivation time, the virus titer decreased continuously and could not be detected after inactivation for 3 h. Transmission electron microscope observation showed that the inactivated virus particles were intact and the spike protein was evenly distributed. Conclusion The virulence of SARS-CoV-2 stored at 2~ 8℃ was unstable, so the subsequent inactivation and purification process should be carried out as soon as possible; The titer of virus could not …

To investigate pre-, co-, and post-seismic crustal deformations from the February 6, 2023, Mw 7.8 and 7.6 Kahramanmaras earthquakes in Turkey, this study analyses data from 30 near-field GNSS CORS over 1.5 years, employing the PRIDE-PPPAR software to calculate GNSS coordinate time series with precision higher than mm level. By fitting these series with a standard linear trajectory model (SLTM), it predicts non-seismic deformation from pre-seismic trajectories, capturing post-seismic displacement. This methodology extracts detailed deformations induced by the two quakes, with post-seismic slip determined via the network inversion filter (NIF) method. The analysis reveals significant pre-seismic secular velocities, indicating a southwestward Anatolian microplate movement relative to the Arabian plate along the East Anatolian Fault (EAF), emphasizing plate tectonics' role in eastern Turkey's seismic activity. Coseismic analysis shows substantial movements, especially at ekz1 and mly1, with seven stations exceeding 3 decimeters in permanent displacement. Post-seismic findings within 180 days demonstrate varied displacements across the Sürgü fault (SF) and EAF, with cumulative slips of 2.3 m and 3.5 m, respectively, and a slip rate decreased from 0.085 m/day to 0.01-0.03 m/day, highlighting the dynamic fault slip behaviors. This research's rigorous methodology and insights affirm the integration of GNSS observations, SLTM, PRIDE-PPPAR software, and NIF method in revealing the 2023 Kahramanmaras earthquakes' crustal deformations.

Nowadays environmental issues have been of great concern to the world, among which the problem of global warming caused by greenhouse gas emissions is particularly prominent. All countries in the Kyoto Protocol and the Paris Agreement have committed to control greenhouse gas emissions, and China, as the largest carbon emitter, has assumed a heavier burden. China has been striving to develop low-carbon technologies such as hydrogen, nuclear, wind, and solar energy, but the most attention should be paid to CCUS, which many scholars have high expectations that CCUS can help China reduce emissions to some extent. Therefore, this paper presents a prediction that CCUS can reduce 3.8% of carbon emissions for China in 2040 when CCUS emission reductions increase at a rate of 30%. The power and chemical industries could reduce carbon emissions by 2.3% and 17.3%, respectively.

Objective To investigate the influence and mechanisms of infection with Streptococcus pneumoniae (SP) at early stage of life and late exposure to the same bacterial antigens on the occurrence and development of asthma. Methods Mice (one week old of BALB/c background) were infected with SP, then 5 weeks later challenged intranasally with inactivate SP bacteria and interleukin-33 (IL-33)+ inactivated SP bacteria to establish model. Lung function and airways hyperresponsiveness (AHR), total cellular and differential counts in bronchoalveolar lavage fluid (BALF) and lungs were measured to evaluate the inflammatory cell infiltration and inflammatory changes in the airways/lungs. The expression levels of IgE and SP specific IgE and IgG in serum, as well as the expression levels of various cytokines in lung homogenates were detected with ELISA. The number of T helper cell (Th) subgroup (Th1, Th2, Th17) and …

In order to study the change rules of mineral composition, micro-structure evolution characteristics and their relationship with dynamic properties of granite after high temperature treatment, the high temperature tests on Beishan granite in Gansu Province, China, were carried out at 20− 1 000℃. Microscopic images of granite after high temperature treatment were obtained by slicing technique and polarizing microscope. The evolution of mineral composition, mineral content and micro-structure characteristic parameters of granite with temperature were studied through mineral composition analysis, micro-cracks characteristic identification and parameters calculation. Subsequently, dynamic impact compression tests of high temperature treated granite were carried out by split Hopkinson pressure bar (SHPB) system, to analyze the effects of temperature, impact rate and micro-structure characteristics on dynamic peak stress. On this basis, the quantitative relationship between micro-structure characteristics and macroscopic dynamic properties was established. The results show that high temperature has a significant effect on the mineral composition, micro-structure and impact compressive strength of granite, and 600℃ is taken as the threshold temperature. The loading rate also significantly affects the impact compressive strength, and the larger the loading rate is, the less the influence of temperature on the macroscopic dynamic properties is. The evolution process of the micro-structure of granite after high temperature treatment is the internal mechanism for the change of its macroscopic dynamic properties with temperature. The microcrack …

A 60-year-old female proband presented with recurrent erythema, blisters and erosions all over the body for 30 years, which had been aggravated 10 days prior to the presentation. Skin examination showed erythematous swelling of the bilateral eyelids with scattered dark red crusts, scattered erythema and erosions on the nasolabial folds and chin, large areas of erythema and erosions on the neck, bilateral axillae, left cubital fossa, perineum and perianal area, accompanied by bright red granulation tissues and positive Nikolsky′ s sign. The proband had two sons, both of whom occasionally presented with erythema and erosions on the axillae and groin, and had not been diagnosed or treated. Blood samples were collected from the proband and her two sons, and genomic DNA was extracted and subjected to whole-exome sequencing. A heterozygous deletion mutation c. 955_957del (p. A319del) was identified in the ATP2C1 gene in the proband and her two sons, which had not been previously reported. The patient was finally diagnosed with generalized familial benign chronic pemphigus.

Straw mulching is a widespread practice for reducing the soil carbon loss caused by erosion. However, the effects of straw mulching on dissolved organic matter (DOM) runoff loss from black soil are not well studied. How straw mulching affects the composition and loss of runoff DOM by changing soil aggregates remains largely unclear. Here, a straw mulching treatment was compared to a no mulching treatment (as a control) on sloping farmland with black soil erosion in Northeast China. We divided the soil into large macroaggregates (>2 mm), small macroaggregates (0.25-2 mm), and microaggregates (<0.25 mm). After five rain events, the effects of straw mulching on the concentration (characterized by dissolved organic carbon) and composition (analyzed by fluorescence spectroscopy) of runoff and soil aggregate DOM were studied. The results showed that straw mulching reduced the runoff amount by 54.7 …

Objective To investigate the risk factors of death from cardiac arrest after acute ST elevation myocardial infarction (STEMI) rescued by extracorporeal membrane oxygenation (ECMO) combined with emergency percutaneous coronary intervention (PCI).Methods A retrospective analysis was performed on the general data of 85 patients with cardiac arrest after STEMI rescued by ECMO with emergency PCI. They were followed up for 28 d. The patients were divided into death group and survival group according to their clinical outcome, and the clinical data of the two groups of patients were collected. Logistic regression analysis was used to analyze the risk factors of death from cardiac arrest patients after STEMI rescued by ECMO combined with emergency PCI.Results Eighty-five patients with cardiac arrest after STEMI rescued by ECMO combined with emergency PCI were followed up for 28 d. A total of 85 patients were admitted to the hospital, including 37 in the survival group and 48 in the death group, with a fatality rate of 56.47%. The ECMO transfer time and the SYNTAX score of coronary artery disease in the death group were lower than those in the survival group (P< 0.05). Length of intensive care unit (ICU) stay, acute physiology and chronic health assessment system Ⅱ (APACHEⅡ) score, cardiopulmonary resuscitation time, and the number of cases with left anterior descending branch affected were longer or higher than those of the survival group (P< 0.05). The difference of interaction between groups, time points, and time points between groups were statistically significant in terms of the net balance volume of fluid (P< 0.05). The net …

The moiré superlattices of 2D semiconductors exhibit many novel physics phenomena including moiré excitons and correlated insulating states. In this work, we report the evidence of an excitonic insulator in angle-aligned 1L/2L WS 2/WSe 2 moiré heterostructure. First, we investigate reflectance contrast spectra of WS 2/WSe 2 moiré heterostructure with varying WSe 2 layer number. The layer degree of freedom strongly modifies the resonant energies of the moiré excitons. In addition, the 1L/2L and 1L/3L WS 2/WSe 2 show an extra excitonic peak close to the original WSe 2 A-exciton resonance, a result of the interfacial nature of the moiré coupling. Further, we show that the valence bands of the 1 st and the 2 nd WSe 2 layer in 1L/2L WS 2/WSe 2 can be tuned to overlap by applying electric field. Holes can partially populate the 2 nd WSe 2 layer at a total filling of one hole per moiré supercell, which is evidenced by …

The correlation of crop growth and its response to water stress are an important basis for establishing a material distribution model and simulating crop growth. Using the data of summer maize (4 years) at Huoquan Experiment Station in Shanxi Province and spring maize (2 years) at Wenyuhe Experiment Station, it was concluded that stem-leaf ratio, grain-stem ratio and root-shoot ratio of maize showed an S-shape, exponential function and power function curve with growth time, respectively. The correlation coefficients between measured and simulated values of stem-leaf ratio, grain-stem ratio in Huoquan and root-shoot ratio in Wenyuhe were all above 0.8, and the fitting accuracy was high. Both stations have been subjected to varying degrees of drought stress for 6 years, and most of the water stress occurred in the filling stage of male-pumping. The root-shoot ratio of spring maize was mostly affected by water …