摘要：
The intervention of nectar robbers in plant pollination systems will cause some pollinators to modify their foraging behavior to act as secondary robbers, consequently adopting a mixed foraging strategy. The influence of nectar robbing on pollinator behavior may be affected by spatio-temporal difference of robbing intensity, and consequently, may have different effects on the pollination of host plants. However, whether and how the nectar robbing might influence pollinators under different robbing intensity still needs further investigation. In this study, Symphytum officinale was used to detect the effect of nectar robbers on pollinators under different robbing intensity as well as their effects on plant reproductive success. Six robbing levels and three bumblebees with mixed foraging behaviors were used to evaluate the effect of different robbing intensity on pollinator behavior, visitation rate, flower longevity and pollen deposition. Our results indicated that the robbing rate increased gradually with the proportion of robbed flowers, but which did not affect the frequency of legitimate visits. The increase of robbing rate promoted the corolla abscission, and then enhanced the self-pollen deposition, but which had no significant effect on cross-pollen deposition. These results indicate that the overall fitness of S. officinale was improved by combined self and cross-pollination modes when visited by both pollinators and nectar robbers simultaneously. Although nectar robbing is not uncommon, its consequences for pollination in the interaction web have not been well studied. Our results emphasize the significance of indirect impacts in mediating the adaptive outcomes of species interactions.
期刊：
Journal of Mathematical Analysis and Applications,2024年529(1):127609 ISSN：0022-247X
通讯作者：
Yang, YQ
作者机构：
[Zhang, Yan-fang] Huzhou Univ, Sch Sci, Huzhou 313000, Peoples R China.;[Yang, Yong-qiang] Cent China Normal Univ, Dept Math & Stat, Wuhan 430079, Peoples R China.
通讯机构：
[Yang, YQ ] C;Cent China Normal Univ, Dept Math & Stat, Wuhan 430079, Peoples R China.
关键词：
Self-affine sponge;Maximal power law;Component-counting measure
摘要：
Let (E, ) be a metric space and let hE (5) be the cardinality of the set of 5-connected components of E. In literature, in case of that E is a self-conformal set satisfying the open set condition or E is a self-affine Sierpinski sponge, necessary and sufficient condition is given for the validity of the relation hE(5) x 5- dimB E, when 5 & RARR; 0. In this paper, we generalize the above result to self-affine sponges of LalleyGatzouras type; actually in this case, we show that there exists a Bernoulli measure & mu; such that for any cylinder W, it holds that hW (5) x & mu;(W )5- dimB E, when 5 & RARR; 0.& COPY; 2023 Elsevier Inc. All rights reserved.
作者机构：
[Chang, CH; Ho, Chia-An; Chang, Chun-Hao; Yeh, Hung-Chih; Chen, Chao-Yuan; Ho, Chin-Shan] Natl Taiwan Sport Univ, Grad Inst Sports Sci, Taoyuan City, Taiwan.;[Li, Fang] Cent China Normal Univ, Sch Phys Educ, Wuhan, Hubei, Peoples R China.;[Chen, Chao-Yuan] Natl Taipei Univ Business, Sport Off, Taipei City, Taiwan.
通讯机构：
[Chang, CH ] N;Natl Taiwan Sport Univ, Grad Inst Sports Sci, Taoyuan City, Taiwan.
关键词：
Mechanical property;Myometer;Rowing;Symmetry index
摘要：
BACKGROUND: The mechanical properties of muscles, such as changes in muscle tone and stiffness, are related to sports performance and injuries. Rowers are at increased risk of muscle fatigue and injury during high-repetition and heavy-load cyclic muscle actions. In view of this, the aim of the present study was to investigate the acute effect on muscle tone and stiffness, as well as bilateral muscle asymmetry, in high school rowers after a 2000-meter rowing ergometer test. METHODS: Twelve young male rowers (age = 17.1 ± 0.9 years, body weight = 73.5 ± 9.7 kg) were included in the study. The data of muscle tone (frequency) and stiffness of the posterior deltoids (PD), latissimus dorsi (LD), and rectus femoris (RF) (dominant and non-dominant side) before and after a 2000-m rowing ergometer test were collected using a handheld MyotonPRO device. RESULTS: After the rowing ergometer test, the muscle tone of dominant side PD, LD, and RF were significantly increased (p < 0.05). On the other hand, the muscle stiffness of the non-dominant side LD and RF, as well as the dominant side PD, LD, and RF were significantly increased after the rowing ergometer test (p < 0.05). The muscle tone and stiffness results showed that the dominant side PD, LD, and RF were all significantly higher than the non-dominant side after the rowing ergometer test (p < 0.05), where bilateral PD and RF exhibits moderate asymmetry (5% < symmetry index < 10%). CONCLUSIONS: After a high-intensity and high-load 2000-m rowing ergometer test, PD, LD, and RF showed increases in muscle tone and stiffness, as well as changes in the symmetry of bilateral muscle mechanical properties.
作者机构：
[Lv, Zhiwei] School of Education, Central China Normal University, Wuhan, Hubei, 430079, China;[Lv, Zhiwei] School of Foreign Languages, Shaoxing University, Shaoxing, Zhejiang, 312000, China;[Ying, Changtian] School of Mechanical and Electrical Engineering, Shaoxing University, Shaoxing, Zhejiang, 312000, China;[Chen, Jiayi] Youth League Committee, Shaoxing University, Shaoxing, Zhejiang, 312000, China
摘要：
BACKGROUND: Moral education in colleges and universities is an important part of the talent training system, including moral education curriculum, moral education practice, mental health education. Volunteer service is a public welfare act in which volunteers volunteer their time, knowledge, property, technology, with the ultimate goal of helping others and serving the society without personal compensation. As an innovative form of moral education practice in colleges and universities, college students' voluntary service is of great significance in promoting the reform and innovation of moral education, enhancing the affinity, appeal and influence of moral education, and building a positive psychology for college students. SUBJECTS AND METHODS: As an effective carrier of moral education practice in colleges and universities, voluntary service is helpful to enhance the effectiveness of moral education practice and construct the positive psychology of college students. This project is based on the actual situation of college students participating in volunteer services, and collected the volunteer services of 4545 college students in Zhejiang Province. Through model construction and data modeling, the correlation between college students' participation in volunteer service and their moral education performance and mental health was analyzed, and the basic path and guarantee measures to promote the role of volunteer service in moral education and positive psychological construction were deeply explored. RESULTS: From the correlation analysis of students' voluntary service participation, moral education performance and voluntary service motivation, students' attributes are determined according to their voluntary service participation, so as to predict their moral education performance and mental health level. CONCLUSION: College students' voluntary service is partially positively related to their moral education performance and mental health. In order to improve students' moral education performance and mental health, we can optimize the participation frequency, participation duration, participation ways and type structure of voluntary service, constantly increase the participation frequency of voluntary service, increase the duration of voluntary service, broaden the participation ways of voluntary activities, and enrich the types of voluntary service activities.
关键词：
Energy splitting of STAR-RIS;time switching of STAR-RIS;UAV-enabled outdoor-to-indoor WPCN;indoor NFZ
摘要：
This letter investigates a Simultaneously Transmitting and Reflecting Reconfigurable Intelligent Surface (STAR-RIS)-assisted unmanned aerial vehicle (UAV)-enabled outdoor-to-indoor (O2I) wireless powered communication network (WPCN), in which the UAV avoids flying over the indoor no-fly zone (NFZ). In the downlink energy transfer (DET) stage, the energy-constrained STAR-RIS and the O2I Internet of Things (IoT) devices harvest energy from the radio frequency (RF) signals of the UAV to self-sustain its operation. In the uplink information transmission (UIT) stage, the IoT devices transmit information to the UAV using the harvested energy, assisted by the STAR-RIS. We introduce the STAR-RIS energy splitting (ES) and time switching (TS) operating protocols in the DET and UIT stages, respectively, to maximize the harvested downlink energy and the achievable uplink sum-rate. Further, an alternating optimization (AO) algorithm based on the penalty method and successive convex approximation (SCA) technology is proposed to solve the resulting highly-coupled non-convex optimization problems, in which the UAV trajectory based on the UAV power consumption model, resource allocation of the O2I IoT devices, and beamforming vectors of the STAR-RIS are jointly optimized. Finally, numerical results demonstrate that our proposed scheme can achieve significant system sum-rate gains that are better than other baseline schemes.
摘要：
Cyberbullying and cyber victimization are widespread problems that impair the physical and mental health of adolescents. To date, the impact of parental phubbing on adolescent cyberbullying and cyber victimization remains underexplored. The current study investigates the relationships between parental phubbing and adolescent cyberbullying and cyber victimization and whether these influence mechanisms work consistently. We recruited 1034 Chinese adolescents aged 12–15 years as a sample and constructed two moderated mediation models to evaluate the relationships among parental phubbing, social anxiety, self-control, cyberbullying, and cyber victimization. The results showed that (1) parental phubbing positively predicted adolescent cyberbullying and cyber victimization; (2) parental phubbing was associated with cyberbullying and cyber victimization among adolescents through the mediating effect of social anxiety; (3) the relationships between parental phubbing and adolescent cyberbullying and cyber victimization and the mediating effects of social anxiety were moderated by self-control; specifically all effects were significant at low self-control and vice versa. The research findings are conducive to informing the risk factors and mechanisms of adolescent cyber violence and further reveal the negative influence of parental phubbing on adolescent development.
期刊：
Critique - Studies in Contemporary Fiction,2024年:16 ISSN：0011-1619
通讯作者：
Cai, Y
作者机构：
[Cai, Yi] Cent China Normal Univ, Sch Foreign Languages, Wuhan 430079, Peoples R China.
通讯机构：
[Cai, Y ] C;Cent China Normal Univ, Sch Foreign Languages, Wuhan 430079, Peoples R China.
摘要：
Centering on the precarious bodies that are diseased or faced with health problems in Danticat's oeuvre, this article from a biopolitical perspective examines how the malfunction of power exacerbates the health condition of individuals, and how those precarious bodies both expose the existing problems in Haiti's health management and provide enlightenment to its improvement. This article argues that external causes of the diseased or health-threatened bodies in Danticat's writing can be attributed to the abuse, misuse, or absence of authoritative power in health management, including the state's inefficiency in managing people's health and security, the neglect in environmental protection, and the authorities' abuse of medical power, which demonstrate Danticat's denunciation of the Haitian authoritative power's inaction in health management and her appeals for urgent measures to be taken to improve people's health. This article contributes to the discussions surrounding the disease narrative and health issues in Danticat's writing, enhances people's understanding of Haitian health issues from a non-Euro-American-centric lens, and enriches the research on biopolitical theories of health.
作者机构：
[Sheng, Xin-Li; Sheng, XL] INFN Firenze, Via Giovanni Sansone 1, I-50019 Sesto Fiorentino, FI, Italy.;[Sheng, Xin-Li] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Oliva, Lucia] Univ Catania, Dept Phys & Astron Ettore Majorana, Via S Sofia 64, I-95123 Catania, Italy.;[Oliva, Lucia] INFN, Sez Catania, Via S Sofia 64, I-95123 Catania, Italy.
通讯机构：
[Sheng, XL ] I;INFN Firenze, Via Giovanni Sansone 1, I-50019 Sesto Fiorentino, FI, Italy.
摘要：
We propose a relativistic theory for spin density matrices of vector mesons based on Kadanoff-Baym equations in the closed-time-path formalism. The theory puts the calculation of spin observables such as the spin density matrix element rho 00 for vector mesons on a solid ground. Within the theory we formulate rho 00 for phi mesons into a factorization form in separation of momentum and spacetime variables. We argue that the main contribution to rho 00 at lower energies should be from the phi fields that can polarize the strange quark and antiquark in the same way as electromagnetic fields. The key observation is that there is correlation inside the phi meson wave function between the phi field that polarizes the strange quark and that polarizes the strange antiquark. This is reflected by the fact that the contributions to rho 00 are all in squares of fields that are nonvanishing even if the fields may strongly fluctuate in spacetime. The fluctuation of strong force fields can be extracted from rho 00 of unflavored vector mesons as links to fundamental properties of quantum chromodynamics.
摘要：
Interictal epileptiform discharges (IED) as large intermittent electrophysiological events are associated with various severe brain disorders. Automated IED detection has long been a challenging task, and mainstream methods largely focus on singling out IEDs from backgrounds from the perspective of waveform, leaving normal sharp transients/artifacts with similar waveforms almost unattended. An open issue still remains to accurately detect IED events that directly reflect the abnormalities in brain electrophysiological activities, minimizing the interference from irrelevant sharp transients with similar waveforms only. This study then proposes a dual-view learning framework (namely V2IED) to detect IED events from multi-channel EEG via aggregating features from the two phases: (1) Morphological Feature Learning: directly treating the EEG as a sequence with multiple channels, a 1D-CNN (Convolutional Neural Network) is applied to explicitly learning the deep morphological features; and (2) Spatial Feature Learning: viewing the EEG as a 3D tensor embedding channel topology, a CNN captures the spatial features at each sampling point followed by an LSTM (Long Short-Term Memories) to learn the evolution of these features. Experimental results from a public EEG dataset against the state-of-the-art counterparts indicate that: (1) compared with the existing optimal models, V2IED achieves a larger area under the receiver operating characteristic (ROC) curve in detecting IEDs from normal sharp transients with a 5.25% improvement in accuracy; (2) the introduction of spatial features improves performance by 2.4% in accuracy; and (3) V2IED also performs excellently in distinguishing IEDs from background signals especially benign variants.
