This paper provides an in-depth research analysis of occupational therapy strategies and psychological regulation of students’ Internet addiction in the existing mobile social media environment. ...Based on the definition of Internet use peer pressure, a preliminary scale with 2 dimensions of specific behavioral pressure and psychological cognitive pressure was developed. First, a professor of mental health education and a master’s degree student in mental health education were invited to rate the scale, while 47 junior high school students were selected to try the scale to ensure that the questions of the scale were clearly expressed. Secondly, 461 subjects were selected to take the initial test of the scale, and item tests and exploratory factor analysis were conducted to ensure that the structure of the scale was as expected and the scale was expressed to psychometric standards. Finally, 810 subjects were selected for the scale retest, and item analysis and validated factor analysis were conducted, and their results met the psychometric criteria. Student peer attachment significantly and positively predicted adolescent Internet addiction; Internet use peer pressure played an incomplete mediating role in the prediction of peer attachment to Internet addiction; loneliness played a moderating role in the pathway of peer attachment to Internet addiction, and loneliness also played a moderating role in the pathway of peer attachment to Internet use peer pressure. The attitude towards online games is entertainment to kill time, a tool to escape the pressure of study and to gain the fun of friends comparing with each other. The main online motivations of adolescents included individual and situational factors, and behaviors were characterized by pan-entertainment and gamification, mainly through mobile social networks to obtain external information and knowledge, maintain interpersonal relationships, and gain a sense of belonging; they were characterized by a fixation on time, space, and online content. The interaction of family members is more of a behavioral habit, and the communication habits and behavior patterns established in the family will influence the construction of children’s relationships with others, while parents’ head-down behavior will also influence children’s attention to various needs of an Internet-dependent behavior problem, which in turn affects children’s problem-solving and intimate relationships with family members.
•The NDVI values were closely related to altitude and water supply in the Yamzhog Yumco Basin.•The response of NDVI to the variation of temperature was greater but slower than to that of ...precipitation.•The positive effects of climate warming on vegetation growth diminished over time at an annual scale.•The cumulative temperature and precipitation of the current and previous months had the strongest impact on NDVI variations.
Vegetation dynamics and their response to climate change is critical for determining the mechanisms of climate-derived variations in terrestrial ecosystems. Here, the Normalized Difference Vegetation Index (NDVI) and monthly temperature and precipitation data were employed to examine the spatiotemporal patterns in vegetation dynamics and investigate the time-lag effects of vegetation responses to climate variables in the Yamzhog Yumco Basin, South Tibet, during 2000–2018. The results reveal that the annual average growing season NDVI in the basin was 0.28, with lower values in the mountainous regions and higher values broadly distributed in the lake and river zones. An increasing NDVI trend was observed in nearly 62% of the total vegetation area, with significant changes observed in the western and southern boundaries of the basin. The vegetation areas in the eastern part of basin exhibited a decreasing NDVI trend. The growing season NDVI was positively correlated with temperature and precipitation, with temperature being the primary driving factor for vegetation growth across the entire basin. The cumulative temperature and precipitation of the current and previous months had the strongest impact on NDVI variations. The correlation coefficients between the NDVI, and temperature and precipitation were greater than 0.6 in approximately 72% and 60% of the vegetation area, respectively, with Lag 0–1 accounting for most of these larger correlation coefficients. Future development targets for grassland conservation projects, such as the reasonable livestock capacity, should consider the time-lag effects on vegetation dynamics.
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•Cellular ceramic structures have been extensively applied in catalysis supports, concentrated solar energy, thermal protection or thermal storage, heat exchangers, radiant burners, ...nuclear fusion, gas streams, and biomedical implants.•Additive manufacturing technologies based on stereolithography, extrusion free-forming, two-photo lithography have been extensively adopted to fabricate cellular ceramic structures.•Structural additively manufactured cellular ceramic lattices, as well as structure–function integrated additively manufactured cellular ceramic lattices, were comprehensively summarized.•Smart and flexible cellular ceramic structures may be the future trend in this field.
Cellular ceramic structures (CCSs) have promising application perspectives in various fields. Recently, additive manufacturing (AM), usually known as three-dimensional printing (3D printing), has been increasingly adopted to produce CCSs. Usually, the structural properties of additively manufactured cellular ceramic structures (AM-CCSs), i.e., lightweight characteristics, load-bearing capacity, toughness, unconventional properties, are traditionally investigated. Interestingly, AM technologies have a significant advantage in achieving the structure–function integration for CCSs. Functional properties, e.g., electromagnetic property, acoustic property, thermal property, of CCSs can be achieved during the structural design synchronously. In this review, firstly, the AM technologies for CCSs are comparatively introduced. Then, structural AM-CCSs are summarized. After that, structure–function integrated AM-CCSs are further introduced in detail. Finally, challenges and opportunities towards structure–function integrated AM-CCSs are forecasted. This review is believed to give some guidance for the research and development of CCSs.
Silicon carbide (SiC) ceramic and related materials are widely used in various military and engineering fields. The emergence of additive manufacturing (AM) technologies provides a new approach for ...the fabrication of SiC ceramic products. This article systematically reviews the additive manufacturing technologies of SiC ceramic developed in recent years, including Indirect Additive Manufacturing (Indirect AM) and Direct Additive Manufacturing (Direct AM) technologies. This review also summarizes the key scientific and technological challenges for the additive manufacturing of SiC ceramic, and also forecasts its possible future opportunities. This paper aims to provide a helpful guidance for the additive manufacturing of SiC ceramic and other structural ceramics.
The emergence of additive manufacturing, commonly referred to as 3D printing, has led to a revolution in the field of biofabrication. Numerous types of 3D bioprinting, including extrusion ...bioprinting, inkjet bioprinting, and lithography-based bioprinting, have been developed and have played pivotal roles in driving a multitude of pioneering breakthroughs in the fields of tissue engineering and regenerative medicine. Among all the 3D bioprinting methods, light-based bioprinting utilizes light to crosslink or solidify photoreactive biomaterials, offering unprecedented spatiotemporal control over biomaterials and enabling the creation of 3D structures with extremely high resolution and precision. However, the lack of suitable photoactive biomaterials has hindered the application of light-based bioprinting in tissue engineering. The development of photoactive biomaterials has only recently been expanded. Therefore, this review summarizes the latest advancements in light-based 3D bioprinting technologies, including the development of light-based bioprinting techniques, photo-initiators (PIs), and photoactive biomaterials and their corresponding applications. Moreover, the challenges facing bioprinting are discussed, and future development directions are proposed.
A hybrid material of carbon nanotubes (CNTs) and Mn-based metal organic frameworks (Mn-MOF) was synthesized and used as a Mn-based supercapacitor electrode material. The incorporation of CNTs into ...Mn-MOF led to an inherent improvement in conductivity and an intrinsic increase in specific capacitance (from 43.2 F g
−1
for pure Mn-MOF to 203.1 F g
−1
for CNTs@Mn-MOF). Furthermore, the symmetrical supercapacitor based on the CNTs@Mn-MOF exhibited excellent power density and outstanding stability even after 3000 cycles with 88% retention of the initial capacitance. This research exploited a new direction for developing Mn-based supercapacitor materials and provided an effective method to improve capacitive performance of MOFs materials.
Dental follicle (DF) can develop into periodontal tissues including periodontal ligament, cementum, and alveolar bone. Possessing superior pluripotency and osteogenic capacity, dental follicle stem ...cells (DFSCs) have become a promising stem cell source for bone regeneration and periodontal engineering. However, the mechanisms underlying DFSCs‐mediated osteogenesis remain elusive. Our previous long noncoding RNA (lncRNA) microarray revealed that lncRNA HOTAIRM1 was significantly higher expressed in human DFSCs (hDFSCs) compared with human periodontal ligament stem cells (hPDLSCs). lncRNA HOTAIRM1, an antisense transcript of the HOXA1/2 intergenic region, can epigenetically regulate proximal and distant HOXA genes through histone and DNA methylation. HOXA2, a target of HOTAIRM1, is crucial for cranial neural crest morphogenesis, branchial arches development, and osteogenesis. However, the roles of both HOTAIRM1 and HOXA2 in odontogenic stem cells remain unknown. Here, we investigated the functions and regulatory mechanisms of these two genes in hDFSCs. Both genes were confirmed highly expressed in hDFSCs compared with hPDLSCs, and they displayed similar expression patterns in the DF and surrounding periodontium during mice tooth morphogenesis. Knockdown of either HOTAIRM1 or HOXA2 inhibited osteogenic differentiation of hDFSCs, while overexpressed HOTAIRM1 inhibited hDFSCs proliferation and promoted osteogenesis. Furthermore, HOTAIRM1 inhibited both overall DNMT1 expression and DNMT1 enrichment on HOXA2 promoter, mechanically binding to the CpG islands of the HOXA2 promoter region, leading to hypomethylation and HOXA2 induction. These findings suggested that HOTAIRM1 promoted the osteogenesis of hDFSCs by epigenetically regulating HOXA2 via DNMT1. Taken together, HOTARIM1 and HOXA2 exerted pivotal functions in hDFSCs, and the regulatory mechanism of HOTARIM1 within the HOXA cluster was uncovered.
Dental follicle stem cells (DFSCs) have become a promising stem cell source for bone regeneration and periodontal engineering, however, the mechanisms underlying DFSCs‐mediated osteogenesis remain elusive. Here we demonstrated that HOTAIRM1 and HOXA2 were highly expressed in human DFSCs (hDFSCs), and HOTAIRM1 could promote the osteogenesis of hDFSCs by epigenetically regulating HOXA2 via DNMT1.
Ceramic lattice structures (CLSs) are promising candidates for structural applications used in conventional and extreme environments because of their extraordinary properties. Herein, CLSs with ...different structural configurations, including body-centred cubic (BCC), Octet, and modified body-centred cubic (MBCC), were designed and fabricated by digital light processing (DLP)-based additive manufacturing technology to explore their quasi-static and dynamic compressive behaviours. It was demonstrated that when relative density was a constant, quasi-static compressive strength (QS), quasi-static Young's modulus (QY), and quasi-static energy absorption (QE) of CLSs with an MBCC structural configuration were the best, Octet ranked secondly, BCC was the poorest. The same thing happened on dynamic mechanical properties of CLSs. Increasing the relative density from 20% to 40% dramatically improved the QS, QY, and QE of CLSs. Furthermore, it was revealed by experiment and simulation that the quasi-static failure mode of CLSs changed from partially fracture along a specific plane to integrally fracture at most nodes as relative density increased. Furthermore, the dynamical mechanical properties of CLSs were significantly outstanding than quasi-static mechanical properties due to the strain-rate effect. This study provides a new basis for further study on tailoring the mechanical properties of CLSs.
•More than a quarter of women pregnant with a second child have anxiety during pregnancy.•The education level of husbands and gender expectation are the main factors affecting the anxiety of the ...woman pregnant with a second child.•Whether this pregnancy is planned and whether they are satisfied with residence are the main factors affecting the stress of a second child.•Whether they have learned antenatal care knowledge, education level and whether they are satisfied with residence are the main factors affecting the psychological capital.•The psychological stress of women pregnant with a second child aggravates her anxiety, and psychological capital has a relief effect on her anxiety.
After the one-child policy has been effective for over 30 years, China implemented the universal two-child policy in 2015. The number of high-risk pregnant women had increased dramatically ever since, increasing negative health outcomes for both mothers and children. Our study aims to investigate the status of anxiety, psychological stress sources, and psychological capital among women pregnant with a second child, and to assess influencing factors and correlations, providing scientific basis for promoting women's health during pregnancy.
We recruited 513 participants from maternity hospitals in Guangdong and Shandong Province. All participants completed the Zung Self-Rating Anxiety Scale (SAS), Pregnant women psychological stress sources questionnaire and the psychological capital questionnaire (PCQ-24).
The prevalence of anxiety of women pregnant with a second child was 27.5%. The score of psychological stress sources was 74.93 ± 16.07. The risk factors for the anxiety of the women pregnant with a second child included low education level of the husband, gender expectation and the sources of psychological stress of the pregnant woman. The risk factors for psychological stress were dissatisfaction of residence and unplanned pregnancy. The main factors influencing psychological capital were the participants’ education level, whether they have learned antenatal care knowledge and satisfaction with the residence.
All participants were recruited only from tertiary hospitals in Guangdong and Shandong province.
Anxiety and psychological stress is prevalent during pregnancy among women pregnant with a second child in Guangdong and Shandong. Psychological capital was a protective factor for anxiety.
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