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Hong-Qin Wei,1 Man Gan,1 Guo-Yan Li,2 Sui-Hong Ma,1 Jian-Hua Liu1 1Department of Ultrasound, Guangzhou First People’s Hospital, Guangzhou, Guandong, People’s Republic of China; 2Department of Rehabilitation Medicine, Guangzhou First People’s Hospital, Guangzhou, Guandong, People’s Republic of ChinaCorrespondence: Sui-Hong Ma; Jian-Hua Liu, Tel +86 13824420620 ; +86 13622888381, Fax +86 020 81332620, Email eymsh@scut.edu.cn; eyliujianhua@scut.edu.cnPurpose: The present study aimed to investigate the differences in muscle size and shear wave speed (SWS) values of biceps brachii muscle (BBM) between stroke survivors and healthy controls.Methods: This study comprised 61 stroke survivors and 24 healthy subjects, examined at Guangzhou First People’s Hospital within one year. Each participant underwent ultrasonic examinations for recording some specific measurement indicators, including muscle thickness, cross-sectional area (CSA), and shear wave speed (SWS) of BBM. The muscular tension of the paretic arm was scored using the modified Ashworth scale (MAS). These above-mentioned indexes were compared between stroke survivors and healthy controls. Also, the correlations among SWS and MAS scores were assessed.Results: When the lifting arm angle was set for 45°, the CSA and muscle thickness of BBM were obviously decreased in the paretic arms of stroke subjects compared to the non-paretic arms as well as the arms of healthy controls. Moreover, the paretic arms had obviously higher SWS than the non-paretic arms and the healthy arms at 45° or 90°. When the angles of paretic arms were lifted at 90° and 45°, respectively, a positive correlation was established between MAS and SWS.Conclusion: Ultrasonic examination assessing muscle thickness, CSA, and SWS of the BBM could be used as a means of assessment of the paretic arms of stroke survivors.Keywords: stroke, muscle, shear wave elastography, ultrasound, thickness, cross-sectional area

The cardiometabolic index (CMI) is an emerging and effective indicator for predicting the presence of metabolic-associated fatty liver disease (MAFLD). This study aims to investigate the relationship between CMI and MAFLD using data from NHANES 2017–2020. In this cross-sectional study, a total of 3,749 subjects were included. The study conducted a thorough analysis of CMI with three multivariate logistic regression models, subgroup analyses, and restricted cubic splines (RCS) were utilized. Using multifactorial logistic regression as the primary method of analysis, we found that a higher CMI was also significantly associated with an increased risk of MAFLD (OR = 1.45, 95% CI (1.05–2.01)). This result was further visualized by the RCS curve: There was a non-linear positive correlation between CMI and MAFLD incidence (the turning point is CMI = 0.4554). These findings were strongly reinforced by subsequent subgroup and sensitivity analyses. There is a robust positive relationship between the CMI and the risk of MAFLD, providing valuable clinical benefits for early detection and screening of MAFLD. It is important to highlight the presence of a non-linear association between CMI and MAFLD, with an inflection point identified at CMI = 0.4554.

ObjectivesThe natural draft cooling towers with flue gas injection (NDCT-FGI) is a crucial retrofitting technique for enhancing the efficiency of thermal power plants. However, its operational impacts on existing systems are significant and cannot be overlooked. Therefore, the current status of NDCT-FGI technology and its problems in operation were analyzed, and the countermeasures were put forward.MethodsThrough comprehensive analysis of the existing research, the causes and formation mechanism of environmental impact, cooling tower corrosion, and deterioration of circulating cooling water quality caused by the technical transformation of NDCT-FGI were discussed.ResultsThe protective distance can be reasonably set by the simulation results of flue gas emission trajectory and pollutant landing concentration by computational fluid dynamics (CFD). Installation of baffles at the tower top can prevent flue gas washdown during the extreme weather conditions. Different anticorrosive coatings are recommended for various parts of the cooling tower to extend its service life. To control and optimize cooling water quality, the advanced water treatment techniques are necessary for optimizing chemical dosing, and the management of effluent and makeup water must be carefully controlled to ensure operational sustainability.ConclusionsBy implementing appropriate and effective countermeasures, the negative impacts of NDCT-FGI retrofitting can be mitigated, thereby enhancing both the environmental and economic benefits for thermal power plants.

To reveal the dynamic load distribution characteristics of planetary roller screw mechanism under the high-speed operating conditions, based on the spiral surface equation and deformation coordination relationship, a static contact force calculation method of the roller-screw and roller-nut thread at the contact point is proposed, and a formula for calculating the contact angle after bearing is derived. On this basis, further considering the inertial force generated by using high-speed operation, a dynamic load distribution model for planetary roller screw mechanism thread was established. By comparing with the finite element contact model of planetary roller screw mechansim, the error is below 5%, which verifies the correctness of the model established. Finally, the influence of the parameters such as screw speed, axial load, pitch, and tooth flank angle on the distribution of dynamic load was analyzed. The results show that the inertia force causes the roller to have a tendency to move closer to the nut and away from the screw resulting in a decrease in dynamic contact force on the roller screw side and an increase in dynamic contact force on the roller nut side. The degree of uneven distribution of dynamic load is positively correlated with the screw speed and pitch, and negatively correlated with the tooth side angle. The size of axial load has a significant impact on the distribution of dynamic load.

In this paper， a steel plant with high pulling speed thin thickness slab continuous casting process as the object is studied， the specific process parameters of the pulling speed of 5.5 m/min， pouring temperature of 1 544 ℃， crystallizer water pressure of 15.6 Pa， the cooling water temperature of 39.1 ℃， and the inverted taper of the crystallizer 7.5 mm and so on.In the process of on-site continuous casting， it was found that the risk of slag rolling increased and the casting bond alarm occurred frequently， the conventional slags and non-Newtonian fluid mold flux with only shear-thinning properties could not effectively in solving these problems .With the mold flux of medium carbon steel on-site as the original mold flux ， combined with additives such as MgO and SiC ， a new type of protective slag with strong shear-thinning properties and high surface tension is prepared. The shear thinning properties， surface properties and microstructure of mold flux were detected and studied by rotating cylinder method and other methods. The results show that with the increase of SiC content， the shear thinning property， contact angle， surface tension and interface tension of the mold flux all show the trend of increasing first and then decreasing， the content of C-O bond and C-Si bond increases， and the degree of molecular polymerization increases . When the SiC content is 0.98%， the shear thinning property is the strongest， and the contact angle， surface tension and interfacial tension are the largest. This enables the mold flux to meet the viscosity requirements at different shear rates， thus effectively suppressing the crystallizer slag rolling behavior and reducing the risk of bond leakage.

Objective To address the difficulties faced in the industrial design of rail transit passenger vehicles, it is necessary to integrate innovative industrial design thinking and concepts to establish a comprehensive method for modular and pedigree applications in rail transit passenger vehicle design. Method First, a modularization analysis of passenger vehicle design components is conducted, dividing the compartment into fixed, optional, and custom modules, and categorizing the exterior into color and shape modules. Then, a pedigree analysis of passenger vehicle design contents is performed, establishing an industrial design pedigree from three dimensions: design requirements, evolutionary context, and product characteristics. Finally, based on passenger vehicle design characteristics, a passenger vehicle industrial design method for modularization and pedigree comprehensive applications is constructed, comprising three steps: sorting out modules based on design requirements, adjusting modules oriented by evolutionary context, and organizing modules based on product characteristics. Result & Conclusion The industrial design method is applied to a passenger vehicle design by a subsidiary manufacturer of CRRC (China Railway Rolling Stock Corporation). The design example verifies the feasibility of the constructed method. The modularization design allows for quick and flexible adjustments of design contents according to user needs, while pedigree design enhances design coherence and systematicity. Combining these approaches enables the completion of both exterior and interior passenger vehicle designs within a shorter design cycle, thereby improving design quality and reflecting brand features.

Abstract Purpose This study aims to investigate the effect of Niraparib in combination with an Anti-GD2 Antibody on osteosarcoma cells. Methods Scratch test was utilized to assess cell migration capacity, while the Transwell experiment was utilized to evaluate cell invasion potential. Cell proliferation was measured using the CCK8 experiment. The affinity between the anti-GD2 antibody and its antigen was determined via ELISA. Tumor growth was evaluated through animal experiments. Western blotting, QRT-PCR, and histological analysis were conducted to examine the expression of relevant proteins and mRNAs. Results MG63 cell line was used for an example. The scratch test showed that the migration rate of osteosarcoma cells in Niraparib + Anti-GD2 group was 1.07 ± 0.04 after 48 h, and 0.34 ± 0.04 in the Control group. Transwell experiment showed that the invasion ability of osteosarcoma cells in Niraparib + Anti-GD2 group was 21.0 ± 1.5, and that in Control group was 87.7 ± 2.9. CCK8 experiment showed that the absorbance value of Niraparib + Anti-GD2 group was 0.16 ± 0.10 on day 5, and that of the Control group was 0.76 ± 0.09. Western blotting showed that the expression levels of BALP and CICP in Niraparib + Anti-GD2 group were 0.751 ± 0.135 and 1.086 ± 0.115, respectively, and those in Control group were 1.025 ± 0.143 and 1.216 ± 0.168, respectively. QRT-PCR results showed that the absorbance values of Niraparib + Anti-GD2 group were 0.173 ± 0.065 and 0.170 ± 0.078 on day 14. The results of animal experiments showed that on day 5, the tumor volume of the Control group was 2433 ± 391, and that of the Niraparib + Anti-GD2 group was 1137 ± 148. Histological analysis showed that the mean density values of Niraparib + Anti-GD2 group were 0.19 ± 0.08 and 0.22 ± 0.07, and those of Control group were 0.26 ± 0.09 and 0.29 ± 0.10. Conclusion The combination of Niraparib and Anti-GD2 antibody significantly inhibits Osteosarcoma cells.

The helix surface model of planetary roller screw mechanism (PRSM) is established by utilizing the parametric equations of space surface according to the structural features of screw, roller and nut. The helix surface model of PRSM is improved in consideration of the PRSM assembly relationship. The normal vector equations of helix surfaces are obtained based on the helix surface model. The meshing clearance models of PRSM in axial, radial and circumferential directions are built considering the movement direction of parts utilizing surface meshing conditions. The influence of structural parameters on the meshing clearance of PRSM is also analyzed. The results show that the meshing points between the roller and the screw in three directions are not in the middle diameter. The meshing points in the three directions of the roller and the nut are in the middle diameter of the roller. The pitch, tooth angle and tooth thickness of the thread all have an influence on the meshing clearance of PRSM. Only by increasing the tooth thickness of the thread can the meshing clearance in the three directions be reduced at the same time. The pitch and tooth angle should be selected properly to meet the practical requirements.

【Objective】 Winter wheat in Northern China is often rotated with other crops which are expected to have a legacy effect. This paper aims to study the effect of different tillage and preceding crops on soil nutrients, yield and water use efficiency of the winter wheat. 【Method】 The field experiment consisted of a rotary tillage (RT) and a no-tillage (NT). The preceding crops for each tillage were corn (MW) or soybean (SW). During the experiment, we measured the changes in soil nutrients, soil water content, water and fertilizer use efficiency, and yield of the wheat. 【Result】 For the same preceding crop, non-tillage increased soil water content compared to rotary tillage; under the same tillage, soil water content with maize as the preceding crop was higher than that with soybean as the preceding crop. In all treatments, soil nutrients decreased with soil depth. In the 0-50 cm soil layer, NTSW increased soil organic carbon, soil total nitrogen and nitrate nitrogen by 4.14%-13.54%, 35.51%-54.44% and 55.75%-112%, respectively, compared to the RTMW. RTMW had the highest available phosphorus and potassium in the 10-50 cm soil layer. The RTSW had the highest ammonium nitrogen in the 0-50 cm soil layer, 13.39%-20.64% more than that in the RTMW. The winter wheat in NTSW had the highest spike numbers, spikelet numbers, thousand-grain weight; and its grain yield was 16.62% higher than that of RTMW. The NTSW had the highest water use efficiency, 8.67% more than that of RTMW. The NTSW had the highest nitrogen, phosphorus and potassium use efficiency. 【Conclusion】 The NTSW facilitated nutrient accumulation in the winter wheat field. It had the highest water and fertilizer use efficiency and increased grain yields the most as a result.

Quando o adoecer provoca a transformação dos contextos de vida e seu consequente esvaziamento, seja por questões clínicas que limitam o cotidiano e/ou devido a dimensões psicossociais e espirituais, a implantação de ferramentas psicológicas nas unidades do Hospital, revestem-se em um importante recurso de ajuda, por resgatar capacidades, instigando recursos de enfrentamento do adoecer a pacientes e familiares. Em associação aos processos de avaliação e acompanhamento psicológico individual, temos oferecido processos preventivos nas Unidades de Infusões de nossa instituição, por apresentar a vantagem operacional de atingir um número maior de pacientes em tratamento e seus acompanhantes. As Unidades de Infusões constituem-se em espaços nos quais os comportamentos presentes podem ser experienciados e novos comportamentos experimentados, em consonância com a teoria de crise delineada pelo diagnóstico e tratamento oncológico. Este trabalho objetiva apresentar o Programa Correio Elegante, como processo integrado, planejado e sistematizado em Unidade de Infusões, em hospital de oncologia pediátrica. A atividade é desenvolvida semanalmente, nas Unidades de Infusões, alternando-se o período para maior abrangência dos participantes. No período de janeiro a junho de 2024, 93 cartas foram trocadas entre pacientes, familiares e equipes de saúde, com a participação de 52 pacientes. Dentre os acompanhantes houveram em sua maioria mães, seguido de pais, irmãos e avós. O Correio Elegante em Unidade de Infusões é um instrumento caracterizado como intervenção breve em seu formato, em tarefa que se pretende adaptativa e de suporte, utilizando técnica focal. Constatamos que por reunir pacientes e/ou acompanhantes em torno de uma mesma demanda, há um melhor entendimento e aceitação entre os participantes, a partir de suas próprias vivências. A curto prazo, essa coesão costuma propiciar melhores resultados psicológicos pois constata-se que as vivências advindas da troca de mensagens e cartas na Unidade, estimulam mecanismos de enfrentamento positivos, permitindo que os participantes vivenciem suas experiências do adoecer e hospitalização, de forma menos conflituosa, referenciando importante função preventiva de risco. Constatamos pelos conteúdos das mensagens que pacientes e familiares, reunidos em torno da dor psicológica do adoecer, sentem-se identificados e unidos, compartilham das mesmas angústias e esperanças, limitações e recomendações, complementando o clima de coesão e apoio necessário para o melhor enfrentamento do adoecer.

There is a great controversy between academic talent mobility and academic output. This paper obtains the list of mobile academic talents (experimental group) from NSF. It matches them into the control group list according to the indicators of an academic institution, department, research direction, entry time, age, and NSF fund obtained in the near year. It carries out a seven-year follow-up survey on the quantity and quality of papers published by the experimental and control groups, using the “quasi-experimental research” method for the first time. The results show that, on the one hand, the academic output of Chinese academic talents is highly stable. Mobility is not the critical variable affecting academic output, indicating that academic output is more related to talents' research habits and research ability, which shows the highly stable academic quality of scholars; on the other hand, the study finds that scholars returning from overseas manifest the stability of academic output whose number and quality of academic papers remain highly stable even if the mobility happens again. This study reveals the objective relationship between academic talent mobility and academic output. It has significant reference value for China in the next stage of attracting talent from the international academic labor market.

At present, the society is in an era of rapid development of science and technology, and the rapid development of wireless communication technology has not only promoted the digital transformation of industry, transportation, medical and other fields, but also continuously upgraded wireless communication networks, trying to move from wired to wireless. With the continuous evolution of computer technology and wireless communication technology, many application scenarios require highly reliable transmission in a wireless environment. Especially in the fields of modern industrial automation and autonomous driving, the demand for highly reliable transmission is more urgent. 5G technology was delved into, which was one of the most advanced wireless transmission technologies in the industry, focusing on multi-channel redundant transmission technology within 5G systems. The key points of the technology in terms of application background, technical principles and technical route were summarized. In terms of application background, the practical application requirements of 5G redundant transmission in wireless scenarios such as modern industrial automation and autonomous driving were highlighted. In terms of technical principles, the relevant research was summarized and sorted out from the end-to-end multi-channel redundant transmission of services, the analysis of the technical principles of 5G multi-channel redundant transmission were focused on, and its unique advantages in improving transmission reliability were explained. In terms of technical routes, the development direction of 5G multi-channel redundant transmission technology and various possible implementation paths were comprehensively considered. Finally, the difficulties and challenges of the future development of 5G multi-channel redundant transmission technology were pointed out, and its future development trend was discussed, so as to better understand the key role and prospect of 5G redundant transmission technology in the field of wireless communication.

Carbonate reservoirs are often stimulated by acidizing and acid fracturing techniques， but the microstructure of the rock surface is corroded and destroyed after acid etching， and the mechanical properties of the rock are changed significantly， which further affects the final stimulation effect. The experiment on the mechanical properties， the study on surface morphological characteristics by scanning electron microscopic （SEM）， and the microscopic pore structure characterization by nuclear magnetic resonance （NMR） are carried out before and after limestone acid etching to clarify the influence of acid etching on the mechanical properties and microscopic pore structure changes of limestone. The results show that acid etching softening layers with a certain thickness of about 11.61 μm appear on the rock surface after acid etching. Remarkably， the compressive strength， elastic modulus， and surface hardness of limestone are all reduced to about 40% before acid etching due to the acid etching softening layers. Dissolved pores of different sizes are formed inside the rock surface after acid etching and stress concentration is induced around the dissolved pores， changing the stress distribution of the acid etching softening layers. Under high closure stress， the dissolved pores are easier to crush deformation or collapse failure， which is also the main reason for the change of mechanical properties of acid etching softening layers. According to the T2 spectrogram of NMR， it is found that there is the largest change in the number of pores with pore sizes between 1 nm and 1 μm， and the acid dissolution alters the internal pore structures of the acid etching softening layers， hence further affecting the mechanical properties of rock after acid etching.

In this study, the changes in the amylose content, crystalline structure, Fourier transform infrared (FTIR) properties, pasting properties, and rheological properties of potato starch were explored after radio frequency (RF) treatment at different polar plate spacings (90, 100, 110, 120, and 130 mm). The appropriate RF parameters for 3D printing of potato starch gels were determined. The results revealed that under low plate spacing, the content of amylose decreased and the crystalline form of starch transformed from B-type to C-type. We found that the starch gel with RF treatment at a plate spacing of 90 mm had the best morphology in terms of transparent line uniformity and high retention rate. To sum up, we can conclude that RF treatment at low polar plate spacings is an effective method for preparing 3D printed starch gels.

A better understanding of the spatiotemporal dynamics of species composition and biodiversity provides significant insights into the distribution patterns of biodiversity and the prediction of biodiversity fate in a global change context. However, how species and phylogenetic diversity change along elevational gradient with temporal scale in mountain ecosystems is still unknown. In this study, we used census data (2004, 2008 and 2013) of an elevational transect (elevational range 960 - 2 878 m) covering eastern and western slopes of Gaoligong Mountains, SW China, to investigate the spatiotemporal dynamics of forest arbor layer (DBH≥5 cm) species composition, species diversity and phylogenetic diversity. The results were as follows: (1) Species diversity was hump-shaped along the elevational gradient, while the phylogenetic diversity increased with increasing elevation. Clustering phylogenetic structure was observed at low elevations, and over dispersed or random structure was detected at high elevations. (2) Overall, temporal species and phylogenetic beta diversity analysis showed no significant difference among these three investigation time points. However, we found a higher clustering of phylogenetic structure along the temporal scale. (3) Spatial beta diversity showed that there was a significant loss of species at low elevations (960 - 1 381 m) on the eastern slope, where the vegetation had been disturbed or completely converted into farmland. The main lost species including Terminalia chebula, Quercus acutissima, Pistacia weinmanniifolia, Hovenia acerba and Ilex wattii. In contrast, the change in the western slope was mild at low elevations, only observing species abundance increasing, which including Cyclobalanopsis oxyodon, Symplocos chinensis, and Taiwania cryptomerioides. Therefore, we speculated that the dynamic changes in species and phylogenetic diversity of the arbor layer of subtropical evergreen broadleaf forest might be related to communities succession process and climatic change in middle and high elevations, while the communities at low elevations were seriously impacted by human activities in Gaoligong Mountains. The results deepen the understanding of the mechanisms of plant community dynamics in Gaoligong Mountains, and provide new insights to guide precise conservation strategies in the region.

Urban agglomerations are the main spatial carriers of national and regional urbanization development. The study of their spatial association networks is of great significance for optimizing the allocation of urban resources, promoting the process of regional integration, and facilitating the high-quality development of urban agglomerations. The Yangtze River Delta urban agglomeration (YRDUA) is one of the most economically active regions in China. Its spatial association network structure was the main feature of economic and social development in China's "14th Five-Year Plan." Based on the perspective of flow spaces in terms of both the city and township scales, multi-source data were used in this study and included online car-hailing origin-destination travel data, combined with complex network models and a quadratic assignment procedure, to analyze the structural characteristics and driving mechanism of the spatial association network of the YRDUA. Results show that: 1) spatial association network based on online car-hailing flow in the YRDUA has spatial dependence and hierarchical characteristics, and intensities of network association are mostly coupled with levels of economic development; 2) spatial association network in the YRDUA displays spatial spillover effects, leading to an overall pattern of high equilibrium in southern development and strong single-point development capacity in the north; 3) the structural features of spatial association network in the YRDUA differ between townships and urban scales, with some high-level townships in certain transportation networks failing to exert their driving role at the urban level; and 4) economic development status, population vitality, the level of urban construction, and administrative division ownership and geographical location differences between townships have significant impacts on the spatial association network structure in terms of the township scale. The differences in administrative divisions are most important. Online car-hailing travel data were used in this study to effectively supplement the links between township streets within and between cities. This data also revealed intercity links. Thus, the development characteristics of spatial units on different scales were reflected, and research and social management needs were satisfied on a fine scale. In addition, by introducing spatial big data and analyzing the influence mechanism from various aspects, such as socioeconomics, the driving factors of the spatial network of urban agglomerations were systematically identified at the small-scale level, which will help with more reasonable planning within the city and play a role in the development of urban agglomerations by enhancing the attractiveness of individual cities. This study expands the research perspectives on the cooperative development of urban agglomerations on different scales, providing theoretical references and practical support for the promotion of the coordinated development of urban agglomerations as a whole.

Under the background of “dual carbon”, new energy sources have begun to be connected to the grid on a large scale. However, the randomness and volatility of new energy generation significantly impact the power grid, making it urgent to build a new power system. As the cornerstone of the power system, traditional thermal power will transform into a basic security and system regulatory power supply, providing reliable capacity, peak regulation and frequency modulation and other auxiliary services. The flexible transformation of thermal power units has become an inevitable choice. The phased objectives, difficulties, and challenges of building a new power system were analyzed, along with the problems encountered in the flexible transformation of thermal power units at the present stage. Combined with thermal power operation data, the technical ways of configuring energy storage equipment for thermal power units were analyzed. The research shows that there are several issues in building a new power system, such as power system instability, difficulties in transforming traditional thermal power, high energy consumption, and environmental pressures. The flexibility transformation of thermal power units faces challenges such as insufficient peak regulation capacity, high operation costs, slow load response, high operation energy consumption, safety concerns, etc. The integration of thermal power and energy storage will bring better economic and environmental benefits.

【Objective】 Black soil is widely distributed in northeastern China and other countries. Machinery operations in agricultural production in these regions has resulted in soil compaction. In this paper, we investigated the impact of soil compaction on growth, yield, and nitrogen use efficiency of maize in the black soil. 【Method】 The field experiment compared three soil compactions: low compaction (C1), moderate compaction (C2) and high compaction (C3). For each compaction, there were two fertilization treatments: nitrogen fertilization (F) and no fertilization (F0). In each treatment, we measured the growth, yield and nitrogen use efficiency of the maize. 【Result】 Increasing soil compaction significantly reduced leaf area index (LAI) and plant height of the maize. Nitrogen fertilization affected plant height significantly but did not impact LAI at significant levels. Soil compaction also impacted grain yield significantly, with the high and moderate soil compaction reducing grain yield by 24% and 10%, respectively, compared to the light compaction. Soil compaction and nitrogen fertilization combined to impact nitrate in the soil. Elaborated soil compaction inhibited maize growth, reduced nitrogen absorption, leading to an increase in residual nitrate nitrogen in soil as a result. Soil compaction also influenced nitrogen uptake and its subsequent translocation in the above-ground part of the maize. Nitrogen fertilization increased nitrogen absorption by the crop significantly, but reduced nitrogen use efficiency, especially in the high compaction treatment. 【Conclusion】 Elaborated compaction of the black soil due to machinery operations severely inhibited growth, absorption and use of nitrogen of the maize, thereby leading to an increase in residual nitrate nitrogen in the soil and reducing grain yield as a result.

The aircraft AC power generation system is the main source of power for the whole aircraft, so a complete safety analysis is required. Traditionally safety analysis pays less attention to the security problems caused by nonlinear interaction between system components. Especially when the support data of the developed model is insufficient, there is a risk of analysis omission. According to the basic characteristics of the power supply conversion process of AC power generation system, this paper constructs a safety control structure chart and identify unsafe control action(UCA) based on the STPA method, and introduces the failure model and effect analysis(FMEA) of similar system to analyse the UCA cause factor and cause scenario. Using formal tool of timed automata theory, the system modeling and verification are carried out. The correctness of this methods is confirmed by expert evaluation and accident comparison. The result shows that the introduction of STPA based on traditional safety analysis methods can effectively identify unsafety control action and the causes of accident, which can be an effective supplement to the traditional method.

Myocardial ischemia/reperfusion (I/R) injury is a classic type of cardiovascular disease characterized by injury to cardiomyocytes leading to different types of cell death. The degree of irreversible myocardial damage is closely related to age, and ferroptosis is involved in cardiomyocyte damage. However, the mechanisms underlying ferroptosis regulation in aging myocardial I/R injury are still unclear. The present study aims to explore the underlying mechanism of piRNA regulation in ferroptosis. Using left anterior descending coronary artery ligation in an aging rat model and a D-galactose-induced rat cardiomyocyte line (H9C2) to construct an aging cardiomyocyte model, we investigate whether ferroptosis occurs after reperfusion injury in vitro and in vivo. This study focuses on the upregulation of piR-000699 after hypoxia/reoxygenation treatment in aging cardiomyocytes by observing hypoxia/reoxygenation (H/R) injury indicators and ferroptosis-related indicators and clarifying the role of piR-000699 in H/R injury caused by ferroptosis in aging cardiomyocytes. Bioinformatics analysis reveals that SLC39A14 is a gene that binds to piR-000699. Our data show that ferroptosis plays an important role in I/R injury both in vivo and in vitro. Furthermore, the results show the potential role of piR-000699 in regulating SLC39A14 in ferroptosis in aging cardiomyocytes under hypoxia/reoxygenation conditions. Together, our results reveal that the mechanism by which piR-000699 binds to SLC39A14 regulates ferroptosis in aging myocardial I/R injury.

[Objective] Atriplex canescens is a high-quality xerophytic shrub widely introduced in desertification control areas, and stubble is a main management measure for desertification control. Revealing the adaptability and compensatory growth mechanism in the recovery process after stubble can provide theoretical support for developing A . canescens into a high-quality feed in desert areas. [Methods] In this study, 5-year-old A . canescens plants were used as object. Through stubble treatment, plant height, crown width, photosynthetic reaction, leaf water potential, leaf hydraulic conductivity, and water use efficiency were measured during the recovery process of A . canescens, and the relationship between functional traits was discussed. [Results] (1) The plant height, crown width, and aboveground biomass of A . canescens after stubble were recovered to the pre-stubble state after a growing season. (2) The leaf water potential, leaf hydraulic conductivity, water use efficiency, and photosynthetic parameters of the stubble plants were higher than those of the control plants. (3) Linear fitting analysis showed that the midday leaf water potential and stomatal conductance of the stubble plants were significantly positively correlated with the growth rate. [Conclusion] A . canescens had good compensatory growth ability after stubble. In the early stage of recovery growth, the flat stubble plants showed higher compensatory growth ability and typical acquisition strategy, and then turned to conservative strategy with the decrease of hydraulic condition in the later stage. Stubble plants allocated more biomass and resource to the growth of aboveground parts such as branches and leaves, and the later resource allocation turned to the growth of underground parts.

SiO2/g-C3N4 composite aerogel material with high specific surface area and porous structure was prepared by direct ink writing 3D printing. The micro morphology and porous structure of the material were characterized，and its adsorption and catalytic degradation properties for high concentration Rhodamine B（RhB） in wastewater were tested. The research results showed that the 3D-printed SiO2 aerogel has a specific surface area of 482.1 m2/g，a nano porous structure with a pore volume of 1.195 cm3/g，and a good adsorption performance for RhB. The porous structure of SiO2/g-C3N4 composite aerogel prepared by modifying with g-C3N4 had little change and maintained high adsorption performance，and the removal rate of RhB（100 mg/L） by 3D-printed composite under UV could reach more than 99%. After five cycles of testing，the removal rate of RhB by SiO2/g-C3N4 composite aerogel was still 92.98%，compared with 55.75% for 3D-printed SiO2 aerogel. According to the mechanism analysis，g-C3N4 in the composite could absorb light energy and generate photogenerated electron-hole pairs ，the electron-hole pairs could react with H2O and O2 to produce oxidizing active substances superoxide radicals，and finally participated in the photocatalytic oxidation and reduction reaction to catalyze the degradation of RhB macromolecules. The high specific surface area of the 3D printing structure realized the large reaction contact area between the catalyst and RhB，and improved the photocatalytic degradation efficiency and cycle stability of the composite.

Abstract Background Rheumatoid arthritis (RA) is a chronic autoimmune disorder and its characteristics include the immune system's invasion of the healthy lining of the joints and the articular structures degeneration. The IL‐21 pro‐inflammatory cytokine, and the reactive oxygen species (ROS) might have a role in the RA etiopathogenesis. The present study assessed the correlation of IL‐21 with vitamin 25(OH)D and the ROS. Methods The study included 120 RA patients and 60 healthy group. The RA patients were categorized based on rheumatoid factor (RF) seropositivity or seronegativity and the RA severity. Chemiluminescent immunoassay and 10% hematocrit were used to check levels of vitamin 25(OH)D and ROS, respectively. ELISA was used for the detection of IL‐21 in the plasma. Results The RA patients had a significantly reduced vitamin 25(OH)D level compared to the healthy controls. The IL‐21 and ROS were however significantly increased in the RA patients compared to the controls. Further, the seropositive RF and the high RA severity patients had significant IL‐21 and ROS increase in comparison with the seronegative RF and the low severity RA patients. Finally, IL‐21 negatively correlated with vitamin 25(OH)D, but positively correlated with the ROS. Conclusion This is the first investigation to confirm the relationship between IL‐21 with vitamin 25(OH)D and the ROS among the RA patients. The findings indicate that vitamin 25(OH)D is reduced in the RA patients' serum. ROS and IL‐21 are also associated with increased RA severity.

Three parts of the experiment were mainly carried out in this research: the effect of Ca on inclusions in 38CrMoAl high aluminum steel under atmospheric pressure, the effect of pressure on the solubility of Ca in pure iron under pressurized conditions, and the effect of Ca on inclusions in 38CrMoAl high aluminum steel under pressurized conditions. The results indicated that Ca can significantly transform the inclusions such as Al2O3 and MgO·Al2O3 with high melting points into calcium aluminate inclusions with low melting points. It was found that the pressure condition can significantly improve the solubility of Ca in pure iron and molten steel, which provided reliable data reference and guidance for popularizing Ca treatment of steel under pressure conditions in the future. Finally, the mechanism of inclusion transformation after Ca treatment was put forward. In this study, the theoretical calculation of thermodynamics was closely compared with the experimental data. It was proposed that to modify the inclusions in high aluminum steel into calcium aluminate inclusions with low melting points, it is necessary to accurately control Ca in the target region.

Objective To analyze the current situation and influencing factors of work engagement of neurology nurses. Methods Using the convenient sampling method, a cross-sectional survey was conducted among nurses in the department of neurology in a Class III and Class A general hospital in Beijing from April to May 2022. The self-designed general data questionnaire, the work engagement scale and the Chinese version of the perceived stress scale were used to survey the nurses in the department of neurology. Results In this study, a total of 660 questionnaires were distributed and 630 were recovered, with a recovery rate of 95. 45%. Totally 630 questionnaires were valid, with an effective rate of 100. 00%. Of the 630 neurology nurses, 34 were male (5. 40%) and 596 were female (94. 60%). The score of work engagement of 630 neurology nurses was (35. 15 ± 5. 34), and the data difference was statistically significant (P＜0. 05). The results of univariate analysis showed that there were statistically significant differences in the scores of work engagement of neurology nurses in terms of age, employment relationship, technical title, working years and children's situation (P＜0. 05). The total score of perceived stress of neurology nurses was (36. 76 ± 8. 10), and the total score of work engagement was positively correlated with the score of sense of loss and perceived stress (P＜0. 05), and negatively correlated with the score of tension (P＜0. 05). The results of multifactor analysis showed that the sense of loss of control, employment relationship, and working for 1～10 years were the independent influencing factors of work engagement (P＜0. 05). Conclusion There are several factors affecting the work engagement of neurology nurses. As clinical nursing managers, they can adopt effective scientific management methods and take effective measures to relieve the psychological pressure of nurses, reduce the level of rumination thinking, and positively guide the establishment of positive emergency psychology, so as to improve the degree of nurses' work engagement, and ultimately achieve the goal of improving nursing quality and patient satisfaction. (目的 分析神经科护士工作投入现状及其影响因素。方法 采用便利抽样的方法, 于2022年4月—5月对北京某三级甲等综合医院神经科护士进行横断面调查。采用自行设计的一般资料调查问卷、工作投入量表、中文版知觉压力量表, 对神经科护士进行调查问卷。结果 本研究共发放问卷660份, 回收630份, 回收率95. 45%; 有效问卷630份, 有效率100. 00%。630名神经科护士工作投入得分为(35. 15±5. 34)分, 各个维度的平均分对比, 差异有统计学意义(P

Pinglu Canal is the backbone project of the New Western Land-Sea Corridor of China. The canal project generated a total of 3.39 × 108 m3 of earthwork that covers approximately 23 types of rocks and soil and is characterized by large amount, diverse composition, and scattered distribution. Currently, the earthwork is utilized mainly through landfill and reclamation (over 50%); however, basic problems exist, including a low high-quality utilization rate, lagging research on demand for earthwork-reused products, lack of innovative technologies for earthwork reuse, a low level of digitalization, and lack of carbon emission evaluation. To address these problems, this study proposes innovative solutions from the perspectives of resource utilization, digitization, and carbon reduction. First, it is necessary to explore the potential application demands for the canal project itself and surrounding areas and propose corresponding utilization paths according to different types of rock and soil, thus to achieve multi-scenario, multi-path utilization. Second, geological information models and information databases should be established for earthwork in excavation areas to help develop a digital excavation‒transportation‒storage‒utilization technology for earthwork. Moreover, it is recommended to conduct a lifecycle assessment to clarify the carbon emissions of multi-path utilization technologies, achieve a dynamic evaluation of carbon emissions by combining with the information from the earthwork databases, and develop modular mobile-type disposal equipment and in-situ utilization technologies to achieve the reduction of cost and carbon emissions. The organic combination of resource utilization, digitization, and carbon reduction is expected to provide a favorable support for the green construction of the Pinglu Canal Project.

The offshore completion fluid has the characteristics of complex composition and high salinity. In order to solve the severe corrosion of underground pipelines causing by completion fluid. In this paper，a polyamide chitosan（PACS） was synthesized from the natural polysaccharide chitosan，and its corrosion inhibition performance on carbon steel was investigated. The results of weight loss corrosion experiments showed that after adding 2 000 mg/L polyamide chitosan to the completion fluid at 80 ℃，the corrosion rate of carbon steel decreased from 3.852 to 0.072 mm/a，and the corrosion inhibition percentage was 98.13%. In addition，electrochemical tests（potentiodynamic polarization and Nyquist curve） also showed that when the concentration of PACS reached 2 000 mg/L，the corrosion inhibition percentages was more than 90%. PACS shows good corrosion inhibition properties of carbon steel.

[Objective] Through the treatment of hydrophilic and hydrophobic by the conditioner, the influence of different interface characteristics of the conditioner on the soil water and salt transport law was explored, and the improvement mechanism of fly ash-based soil conditioner on saline-alkali land was revealed in order to provide scientific reference for the improvement of different types of saline-alkali land in irrigation area of the Yellow River. [Methods] Taking sodic sline soil in Ningxi Hui Autonomous Region as a case study, the spatial transport patterns of different salt ions in the soil before and after modification with the soil conditioners were investigated by soil column experiments. [Results] After the addition of unmodified conditioner, hydrophilic-modified conditioner, and hydrophobic-modified conditioner, the surface desalination rates were 79.72%, 59.91%, and 84.79%, respectively, for a sodic saline soil far greater than the values obtained without conditioner added (12.64%). Compared with the unmodified conditioner treatment group, the water content of the hydrophilic treatment group was 6.59% greater, and the total salt amount was 47.13% greater. The water content of the hydrophobic treatment group was 0.67% less, and the total salt amount was 25.22% less. The pH values were reduced from 10.5 to 8.08 and 8.71, respectively. The surface Na+ contents were reduced by 10.39% and 30.46%, and the K+ contents were reduced by 10.22% and 45.93%, respectively. [Conclusion] The interface properties of soil conditioners significantly affected water and salt transport in the soil. The hydrophobic conditioner treatment was more effective in improving saline land, and increasing the infiltration of salts with soil water is more important for saline land improvement.

Objective To preliminarily summarize the epidemiological and clinical characteristics of functional movement disorder (FMD) based on movement disorders clinic in China. Methods and Results A total of 593 patients with movement disorders newly diagnosed in movement disorders clinic of 22 clinical medical centers from August to September in 2023 were included, including 37 patients (6.24%) with FMD and 556 patients (93.76%) with organic movement disorder. Comparison of the epidemiological characteristics of the 2 groups, the proportions of corona virus disease (COVID⁃19) infection (χ2 = 4.217, P = 0.040) and psychopsychological symptoms (χ2 = 18.694, P = 0.000) in the FMD group were higher than those in the organic movement disorder group, while age (t = 3.757, P = 0.000), age of onset (t = 3.720, P = 0.000) and proportion of hypertension (χ2 = 4.736, P = 0.030) were lower than those in the organic movement disorder group. Comparison of the clinical characteristics of the 2 groups, the FMD group had higher proportions of tremor (χ2 = 3.955, P = 0.047) and myoclonus (Fisher′s exact probability: P = 0.011) than the organic movement disorder group, and the proportions of parkinsonism (χ2 = 8.491, P = 0.004) and gait disorder (χ2 = 5.028, P = 0.025) were lower than those in the organic movement disorder group. Conclusions The age and age of onset, as well as the proportions of COVID⁃19 infection, hypertension, psychopsychological symptoms, tremor, myoclonus, parkinsonism and gait disorder with FMD were different from those with organic movement disorder in China.

Hypertrophic scar (HS) is one of the most common sequelae of patients, especially after burns and trauma. The roles of regulatory long noncoding RNAs (lncRNAs) in mediating HS remain underexplored. Human hypertrophic scar-derived fibroblasts (HSFBs) have been shown to exert more potent promoting effects on extracellular matrix (ECM) accumulation than normal skin-derived fibroblasts (NSFBs) and are associated with enhanced HS formation. The purpose of this study is to search for lncRNAs enriched in HSFBs and investigate their roles and mechanisms. LncRNA MSTRG.59347.16 is one of the most highly expressed lncRNAs in HS detected by lncRNA-seq and qRT-PCR and named as hypertrophic scar fibroblast-associated lncRNA (HSFAS). HSFAS overexpression significantly induces fibroblast proliferation, migration, and myofibroblast trans-differentiation and inhibits apoptosis in HSFBs, while knockdown of HSFAS results in augmented apoptosis and attenuated proliferation, migration, and myofibroblast trans-differentiation of HSFBs. Mechanistically, HSFAS suppresses the expression of A disintegrin and metalloproteinase with thrombospondin motifs 8 (ADAMTS8). ADAMTS8 knockdown rescues downregulated HSFAS-mediated fibroblast proliferation, migration, myofibroblast trans-differentiation and apoptosis. Thus, our findings uncover a previously unknown lncRNA-dependent regulatory pathway for fibroblast function. Targeted intervention in the HSFAS-ADAMTS8 pathway is a potential therapy for HS.

ObjectiveThis study aimed to provide basic data for the formulation of laws and regulations related to prebiotic health food and product production， by systematically investigating the product information of prebiotic health food approved in China.MethodsThe examination and approval information of health food containing prebiotics in China from 1996 to 2022 were investigated， including the ingredient list of health food， functional claims， and suitable population information. The product information database was established. The frequency of adding prebiotic ingredients， product functional claims， and suitable population distribution were statistically analyzed.ResultsA total of 504 prebiotic health foods were approved from 1996 to 2022. Prebiotics were mostly added in the form of combination， but the ingredients used were mainly concentrated in three kinds， which were fructo-oligosaccharides （44.44%）， isomalto-oligosaccharide （22.02%）， and xylo-oligosaccharides （19.05%）. The function was claimed to be relatively simple. The products of “enhancing immunity”， “defecating”， and “regulating intestinal flora” account for 38.20%， 32.60%， and 14.60%， respectively. The common suitable people in the product were those with low immunity， constipation， and gastrointestinal dysfunction.ConclusionHealth food containing prebiotics in China has a favorable development space in the future. Updating the relevant policies and regulations， guiding the production enterprises to follow up in time， and promoting a healthy development of health food containing prebiotics in China is necessary.

Two-dimensional layered semiconductors have attracted intense interest in recent years. The van der Waals coupling between the layers tolerates stacking various materials and establishing heterostructures with new characteristics for a wide range of optoelectronic applications. The interlayer exciton dynamics at the interface within the heterostructure are vitally important for the performance of the photodetector and photovoltaic device. Here, a heterostructure comprising two-dimensional organic-inorganic Ruddlesden–Popper perovskites and transition metal dichalcogenide monolayer was fabricated and its ultrafast charge separation processes were systematically studied by using femtosecond time-resolved transient absorption spectroscopy. Significant hole and electron transfer processes in the ps and fs magnitude at the interface of the heterostructure were observed by tuning pump wavelengths of the pump-probe geometries. The results emphasize the realization of the exciton devices based on semiconductor heterostructures of two-dimensional perovskite and transition metal dichalcogenide.

In this study, we investigated the effect of toughening treatment (55 ℃ for 0, 12, 24, 36, 48 and 60 h) on the microstructure, pasting properties, thermal properties, rheological properties and 3D printability of potato starch. The results showed that the toughening treatment roughened the surface of starch granules and increased the viscosity and pasting temperature of the starch. The toughened potato starch gel showed greater mechanical strength and a more stable and ordered internal structure than the native starch gel. It was found that toughening treatment for 36 h had a significant effect on the printing characteristics of potato starch gels, resulting in the highest printing accuracy and height as well as the best printing performance.

Ecological monitoring is an important part of environmental protection. To monitor the movement and abundance of animals in the airspace, an Aerial Ecological Monitoring System (AEMS) is developed by CMA Meteorological Observation Center for China's next-generation weather radar (CINRAD) network. Characteristics of weather radar clear air echo data and airborne biological scattering data are studied to identify biological echoes through fuzzy logic algorithm, and the system can monitor real-time ecological activities of insects such as biological density, migration path and space-time distribution.Weather Radar Airborne Ecological Monitoring System has been put into trial operation since May 2022. During the real-time monitoring period, it's found that the insect activity shows obvious spatial and temporal distribution characteristics. From August to September, pests are of large quantity and wide range, indicating urgent need of insect disaster prevention and control. In May, June, September, and October, insect activity gradually increases from 2000 BT every day, reaches its peak from 2200 BT to 2300 BT, gradually decreases thereafter, and disappears mostly by 0600 BT. In July and August, insect activity gradually increases from 2000 BT every day, with a peak from 2100 BT to 2200 BT. Insect activity begins during the daytime, increases at 0600 BT, becomes more frequent at 1300 BT, and gradually decreases thereafter. From May to July, there is a significant shift from south to north (i.e., northward migration process), and in late August, it quickly changes into a to southward migration. The southward migration process of insects is larger and more numerous than the northward migration process. It's verified that the system can effectively monitor real-time aerial ecology, providing technology and data support for precise pest control.However, characteristics of pests need further research and clear distribution of pests is an urgent need. Therefore, in-depth research will be carried out on aerial ecological classification technology, combined with other direct observation means such as real-time monitoring by drones to explore the relationship between radar detection and different pests, and improve the ability to identify different kinds of insects.

[Objective] The structure and sustainability of livelihood factors and their coupling coordination under different grazing intensities were studied in order to provide a scientific basis for optimizing the livelihood strategies of farming households, increasing their economic income, and realizing rural revitalization. [Methods] Taking the typical district of loess hilly area as an example, based on the sustainable livelihood framework, constructing the evaluation index system from multiple livelihood elements, combining the survey data of farmers and mathematical modeling, a comprehensive study was conducted on the sustainability of livelihoods of farmers with different grazing intensities and their coupled and coordinated development. [Results] ① Grazing intensity enhanced the sustainability of farmers’ livelihood capital, but there were significant differences in the effects on the sustainability of livelihood environment, livelihood strategies, and livelihood outcomes. ② Livelihood sustainability was highest under moderate grazing intensity, and livelihood capital, livelihood environment, livelihood strategy, and livelihood outcome sustainability increased by 37.86%, 3.83%, 9.92% and 30.45%, respectively, compared with non-grazing farmers. ③ The coupling coordination development characteristics followed the order of moderately grazing farmers > lightly grazing farmers > heavily grazing farmers > non-grazing farmers. Farmers’ livelihood coupling degree was higher than the coordination degree, indicating that the livelihood system of grazing farmers in the loess hilly region had a strong inter-role intensity, and that good coupling and synergistic development within the system had not yet formed. Therefore, it will still be necessary to further strengthen the transformation and upgrading of farmers’ livelihoods to improve their livelihood sustainability in the future. [Conclusion] Moderate grazing can increase livelihood capital and optimize livelihood strategy for farming households in the loess hilly region, and increase the livelihood sustainability and economic income of farming households.

Based on the structural characteristics of ring-shaped roller screw mechanism (RRSM), helical equations of the screw, roller and nut are derived. Meshing equations at the screw-roller and nut-roller interfaces are developed, which can be used to calculated contact positions of thread teeth. The equations of axial clearances in the RRSM are also derived and zero-clearance design values of the thread thicknesses are given. By comparing the contact positions and clearances obtained from a previously published numerical model, the feasibility of the proposed model is validated. The influence of structural parameters on the meshing characteristics of the RRSM is analyzed. When the nominal radius of the screw is increased or that of the roller is decreased, the contact point at the screw-roller interface will move towards to the tangential-point of pitch circles. The difference between the value of the screw flank angle and that of the screw flank angle has great influence on contact positions. When the values of the nut and roller flank angles are equal, the contact points will lie on the tangential-point of pitch circles and the zero-clearance design value of the thread thickness at the nut-roller interface is equal to the half of the screw pitch. The radius of the roller thread profile has little influence on the zero-clearance design values of thread thickness.

Aiming at the problem that the fatigue performance of aeroengine blade leading edge was seriously degraded after foreign object damage（FOD）, the surface of TC4 titanium alloy thin wall specimen was treated by laser shock/mechanical shot peening, and the residual stress gradient distribution on the specimen surface before and after the composite strengthening was measured by X-ray diffraction method； The high order vibration fatigue life of TC4 titanium alloy thin wall specimens before and after treatment was tested by electromagnetic vibration table, and FOD was introduced into the specimen surface by fabricating pits of different shapes with a hardness tester； The fatigue fracture surface was analyzed by SEM； The evolution of residual stress distribution on the specimen surface before and after FOD was simulated by finite element dynamic numerical simulation, and the mechanism of the influence of the composite strengthening layer on the notch fatigue performance of FOD was revealed. The results show that the average fatigue life of the composite strengthened FOD specimen is 370% and 60% higher than that of the non strengthened FOD specimen and the non strengthened FOD specimen, respectively. The deep residual compressive stress field（thickness 500 μm）formed on the surface layer of the specimen after composite strengthening is an important reason for increasing the fatigue life of FOD specimen.

Abstract Background The existing literature on perioperative outcomes of robotic‐assisted thoracoscopic surgery (RATS) versus video‐assisted thoracoscopic surgery (VATS) for lung lobectomy is inconclusive. Methods We conducted a retrospective cohort analysis of VATS and RATS lobectomy procedures for patients with non‐small cell lung cancer to compare the short‐term perioperative outcomes by propensity score matching (PSM) analysis. Results A total of 418 patients were enrolled in this study. After PSM, 71 patients each received VATS and RATS lobectomy for further analysis. RATS lobectomy was associated with a lower rate of conversion to thoracotomy (0% vs. 5.63%, p = 0.006), a lower rate of postoperative prolonged air leak (1.14% vs. 19.72%, p = 0.001) and a shorter duration of postoperative chest tube drainage (3 days interquartile range [IQR: 3, 4] vs. 4 days IQR [3–5], p = 0.027). Subgroup analysis indicated that after acquiring proficiency in the RATS procedure, its disadvantages diminished while its advantages were enhanced. In terms of rate of conversion to thoracotomy, length of hospital stays, and duration of postoperative chest tube drainage, RATS was comparable to uniportal VATS and superior to triportal VATS. Conclusion RATS has advantages over VATS in terms of early chest tube removal, early discharge, lower thoracotomy rate, less postoperative air leak, and a potential trend of more lymph node dissection numbers. These advantages are more pronounced after acquiring proficiency in RATS.

A study is presented on a quantitative evaluation method of structural safety for an existing three-hole stone arch bridge, in order to determine the structural safety status of this type of stone arch bridges and provide a scientific basis for their restoration and conservation. Taking as an example a typical three-hole stone arch bridge, the Yongchang Bridge, firstly, its shape and the structural configuration were studied and its damages were surveyed and categorized. Then, the structural performance of the Yongchang Bridge was analyzed by using finite element software. An improved analytic hierarchy process method based on component importance analysis was proposed to obtain the weight coefficients of the main structural components of this kind of bridges. Finally, the structural safety status of the Yongchang Bridge was quantitatively evaluated with this proposed method, which was proved to be consistent with the real situation, verifying the efficiency and accuracy of this evaluation method. The results can provide a reference for structural safety evaluation and scientific conservation of ancient stone arch bridges.

ObjectiveStatistical analysis of the domestic health food that has been filed from July 2017 to April 2022 was carried out to provide reference about the research and filing of health food for manufacturers ， and to provide data support for regulatory authorities to formulate relevant regulations.MethodsA total of 9 835 health food records were collected from the special food information inquiry platform of the State Administration for Market Regulation and administration for market regulation of all provinces， autonomous regions and municipalities directly under the Central Government. The number of records， filing regions， dosage forms， product types， health functions and raw material compatibility were analyzed.ResultsThe number of health food records in China had been increasing overall since 2017， but the regional distribution of health food records was uneven. Among them， tablets accounted for more than 50% and capsule products for about 30% in shape； of 8 950 nutrient supplements， the largest number of products supplemented with single nutrient supplements was 43.7%. A total of 885 functional health food products had been recorded. The number of products with spirulina as raw material was less， while the number of other four raw materials were all over 150.ConclusionSince the beginning of domestic health food recording， the number of recorded products has reached up to nearly 10 000. We recommend that he relevant regulatory departments should continuously improve the existing regulations to ensure the steady and rapid development of health food filing in China. Manufacturers shall， in accordance with people’s health needs and relevant regulations， carry out formulation research and product filing， which will not only bring economic benefits to manufacturers themselves， but also help promote the construction of “Healthy China”.

In order to study the dynamic characteristics of flap transmission mechanism with clearance joints, based on an improved nonlinear normal impact force model with variable stiffness, and the elastic factor of connecting rod, the angular velocity and angular acceleration of the steering gear are simulated and analyzed with the conditions of different clearance joints （c=0、c=δ and c=1.6δ） , and different friction parameters （0.06、0.08 and 0.1）. The dynamic output angular velocity and angular acceleration of the flap transmission exhibit obvious oscillation, and the amplitude of the angular acceleration is larger than that of the angular velocity oscillation; at the same time, when the driving load changes, the angular velocity and angular acceleration fluctuate greatly, but the fluctuation degree in the case of c=0 is greater than that with clearance; in addition, the higher the friction coefficient at the clearance joint is, the greater the amplitude of angular velocity and angular acceleration oscillation are, accompanied by high-frequency oscillation and delay phenomenon.

Our ability to perceive the correlation of different substances in the world is one of the key aspects of human intelligence. The passing of this faculty to artificial intelligence (AI) represents arguably one of the long-standing challenges in the application of AI to scientific problems. To meet this challenge in the burgeoning field of AI for chemistry, we may adopt the paradigm of knowledge graph. Herein, focusing on catalytic chemical reactions, we have developed a semantic knowledge graph framework based on both structured and unstructured data, the latter of which are extracted from the text of 220,000 articles on catalysts for organic molecules. The framework captures the latent knowledge of reactant-catalyst-product relationships and can therefore provide accurate recommendation on potential catalysts for targeted reaction, which especially facilitates the research involving large molecules. This study presents a viable pathway towards the implementation of literature-based data management in a catalyst recommendation platform.

The study divides the knowledge system of university students’ innovation and entrepreneurship teams into the main system, resource system, operation system, environment system, and exchange system, constructs the synergistic mechanism model of each subsystem, and accelerates the generation of innovation results. Then, from the perspective of the knowledge ecosystem and social network, an innovation team of University M is selected as the research object to analyze the characteristics of the synergistic network of the knowledge system of the team, to find out the cohesive subgroups, structural holes, edge points, and isolation points in the network, and to validate them by using the social network analysis method. The overall network analysis yielded that the overall network centrality potential of this innovation and entrepreneurship team was 25.52%, the connection between members was not strong, the team was loose, and the knowledge-sharing activities were not active. Individual net analysis reveals that active participants in knowledge synergy activities, whether spreading knowledge or learning knowledge, play an important role in sharing knowledge within the team but can be overly dependent. The analysis of this study will help to discover the characteristics of knowledge synergy behavior of innovation and entrepreneurship teams and the factors affecting the synergy behavior, which can be used as an objective basis for improving the synergy behavior of team knowledge systems.

In order to study the effect of digital media content production and dissemination supported by artificial intelligence technology, we aim to improve the dissemination and influence of digital media in short video platforms. This paper takes digital media as the research object and launches research on digital media content production and dissemination mode. Based on the research method of inquiry description, the core process of digital media intelligent transformation was deeply analyzed, and the overall logical framework of digital media intelligent transformation was designed. The digital media content production flow model is built by combining data integration and aggregation mining from a digital media content perspective. A graph-convolution matrix decomposition recommendation model for digital media broadcasting was developed by analyzing the performance of algorithmic recommendation in digital media applications. The results are presented: in terms of the order of influence degree size, the degree of influence on the number of likes is greater for political news (Beta = 0.2026, p < 0.01) than for military science and technology (Beta = 0.1637, p < 0.01) than for social news (Beta = 0.1225, p < 0.05), i.e.It indicates that the content theme is shifting from traditional social news to political news, which makes it easier to increase the heat of content dissemination. This study helps us think about the impact of media content production and dissemination strategies in the age of mobile Internet and provides new inspiration for communication theory research.