Subjects: Library Science，Information Science >> Information Science submitted time 2023-07-28
Abstract： [Purpose/Significance] During the duration of the pandemic, how to timely perceive, effectively quantify and continuously track the impact of the government's containment policy combination on public cognition and sentiment is an urgent problem to be solved in monitoring and emergency response. [Method/Process] Based on the emotion as social information theory, we propose a new method combining the BERTopic model with Multiple Linear Regression(MLR) and Regression Discontinuity in Time (RDiT) to carry out causal inference on more than 310,000 high-frequency user comments on COVID-19 on SINA MicroBlog in 2020, in order to reveal the impact of the combination of containment policies on the public sentiment. [Results/Conclusion] The findings are as follows: (1) The implementation of the COVID-19 containment policy combination around February 20, 2020 caused a significant decrease in the values of sentiment by 0.07-0.12 units, and around April 28, 2020, also caused a significant increase in the values of sentiment by 0.06-0.08 units; (2) The combination of containment policy has a heterogeneous impact on public sentiment, and policies involving individuals and coercive policies are able to arise heated discussions and significantly reduce the values of public sentiment; (3) The causal chain of policy intervention → user's hot topic → public sentiment constructed based on analysis can play a role of retrospective inference of policy implementation effectiveness. This study not only opens up new ideas for containment policy evaluation, but also adds new means for public oriented real-time pandemic prevention monitoring.
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Geography submitted time 2023-03-15 Cooperative journals: 《干旱区地理》
Abstract： Preventing poverty from returning and establishing a long-term mechanism for poverty eradication are the key footholds for consolidating and expanding the achievement of poverty eradication. Exploring the income of low-income farmer households and its influencing factors can provide ideas and reference for establishing a mechanism that could prevent poverty and return to poverty. Based on the survey data of farmer households in 18 administrative villages in three counties of Qinghai Province, China, this study analyzes the income characteristics of low-income farmer households from a farmer’s perspective. With the help of the geographic detector and Tobit models, this study investigates the influencing factors affecting the income of farmer households and their income structure, determines the explanatory power and significance of these factors, and puts forward policy suggestions combined with the analysis results. The main conclusions are as follows: (1) the total household income of low-income farmer households has significantly increased; the effect of this increasing income is obvious; and the effect of poverty alleviation is remarkable. (2) the willingness of farmer households to increase income and endogenous power has been significantly improved by the allocation of poverty alleviation resources; wage income has also become the main source of income for farmer households. (3) the explanatory power of a single factor of income impact has great differences, and the driving force of a two- factor interaction is higher than that of the single factor action; the labor force and the number of poor households are the most significant driving forces of the interaction. (4) The allocation of public poverty alleviation resources significantly affects the income structure of farmer households, and the influencing factors of different income channels differ. In the income promotion stage, we should focus on the influencing factors with a high contribution.
Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：当前,横向领域县级融媒体中心建设正全面展开;与此同时,如何开展纵向垂直领域融媒体建设,加强媒体融通发展,成为学界关注的问题之一。本文以成都科技融媒体中心为例,对垂直领域融媒体建设对传播能力提升作用开展实证研究。
Subjects: Mechanics >> Solid Mechanics submitted time 2023-06-21 Cooperative journals: 《应用力学学报》
Abstract：
In this study,a multi-walled carbon nanotube-modified natural rubber composite was prepared.The preparation process improved the dispersion performance of carbon nanotubes in the rubber matrix by adding the surfactant cetyltrimethylammonium bromide(CTAB),which reduced the percolation threshold of carbon nanotube content and built the conductive network more effectively.The tensile strength and stiffness of the composites were found to increase with the increase of carbon nanotube content through experimental studies; the resistance/strain sensitivity factor of the material was highest at 4% of carbon nanotube content; the resistance and strain of the material maintained synchronous changes under cyclic loading and reached stability after a certain number of cycles,showing highly sensitive and stable response characteristics,proving that the composites are suitable for strain of large deformation construction.It is proved that the composite material is suitable for strain monitoring and sensing of large deformation construction.
Subjects: Psychology >> Developmental Psychology submitted time 2023-03-28 Cooperative journals: 《心理科学进展》
Abstract： Individuals with lower socioeconomic status (SES) are exposed to more stressful events but have less coping resources compared to those on higher ranks. They are hence more prone to a variety of diseases from the fetus to the elderly. Allostatic load (AL) provides an effective index to such cumulative effect of chronic stress on interconnected biological systems. Research revealed that AL is sensitive to changes in SES. The moderating and mediating factors between SES and AL include environmental risks, social support, psychological characteristics and life style. We propose that investigations on AL may shed light into understanding and intervention of disadvantaged populations in China.
Subjects: Psychology >> Social Psychology submitted time 2023-03-27 Cooperative journals: 《心理学报》
Abstract： Feeling trusted by supervisors is not only beneficial for employees’ job attitude and performance, but also for organizational effectiveness. Feeling ability-distrusted, defined as “the extent to which a subordinate perceives that their leader evaluates their ability to be untrustworthy”, is a crucial part of trust research. Previous research has revealed that feeling ability-distrusted by supervisors is detrimental to employees’ self-concept. Nevertheless, this prevailing assumption leaves our understandings of trust incomplete. Traditional Chinese management practice (e.g., “Jijiangfa”) has suggested that supervisors’ distrust may encourage employees to exhibit their better self. However, limited attention has been paid to the potential positive influence of employees' feeling ability- distrusted by their supervisors on their self-concept. For example, when employees perceive ability-distrust from their supervisors, they may lose their confidence in their abilities, or, on the other hand, may be motivated to prove their abilities. Thus, an important question is: Does feeling ability-distrusted by supervisors have both positive and negative effects on subordinates’ self-concept, and if so, why? To address this question, drawing from self-evaluation and psychological reactant theories, we examine the effects of feeling ability-distrusted by supervisors on employees’ job self-efficacy and desire to prove their abilities, which in turn influence employee work effort and job performance. Furthermore, we examine the moderating effect of perceived supervisor competence on the relationship between feeling ability-distrusted by supervisors and employees’ job self-efficacy or employees’ desire to prove their abilities. We conducted one experiment and two multi-wave field studies to test our hypothesis. In Study 1, we designed a 2 × 2 experiment, with 4 different scenarios. The scenarios described the interaction at work between a fictional employee named Wang Chen and his supervisor. We recruited 164 undergraduates from a university and assigned participants randomly to each of the scenarios. Each participant read the scenario and took on the role of Wang Chen. Next, participants reported their job self-efficacy, desire to prove their abilities, manipulation check, and demographics. In Study 2, we initially recruited 227 employees and their immediate supervisors from an insurance company in southern China. Employees were asked to report on their feeling ability-distrusted by their supervisors, job self-efficacy, desire to prove abilities, work effort, perceived supervisor competence, and demographics. One week later, supervisors were asked to report their subordinates’ job performance. Before responding to the surveys, participants were informed that the survey data would be confidential and only used for academic research., There were 195 pairs of matched and usable data for our final sample. In Study 3, we surveyed 266 employees and their supervisors across 65 workgroups. The employees reported on feelings of ability-distrust by their supervisors, perceived supervisor competence, and their demographics. One month later, employees were required to assess self-efficacy on the job, desire to prove their abilities and work effort. Supervisors were then invited to rate employees’ job performance. Results showed that when perceived supervisor competence was high, feeling ability-distrusted by supervisors was negatively associated with job self-efficacy, which in turn, decreased employee work effort and task performance. On the other hand, when perceived supervisor competence was low, feeling ability-distrusted by supervisors was positively associated with employee’s desire to prove their abilities, which in turn increased employee work effort and task performance. This study makes several theoretical contributions. First, we contribute to the literature on trust by challenging the consensus that feeling ability-distrusted by supervisors is unequivocally detrimental to employees’ self- concept. Second, we contribute by identifying an important boundary condition for the effects of feeling ability- distrusted by supervisors. From the perspective of perceived credibility of evaluation information, we found that perceived supervisor competence moderated the effects of feeling ability distrusted. Finally, we contribute to the literature on work effort by identifying an important but neglected antecedent of employee work effort. We suggest that beyond leaders’ positive behavior, their negative behaviors (e.g., expressed distrust) may also lead to employees’ increased work effort when employees perceive supervisor competence to be low.
Subjects: Psychology >> Management Psychology submitted time 2021-08-13
Abstract： "
Peer Review Status:Awaiting Review
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract： A new Cu-based composite Cu/Ti3SiC2/C was prepared by powder metallurgy. Then the tribological performance of the composite was examined under different sliding speeds and loads by means of a specially designed sliding apparatus. The worn surface of the composite was characterized by SEM equipped with EDS. The results show that the amount of wear loss increases linearly with the increase of the sliding distance under the condition of high speed and low load. The observation of the worn surface showed that scattered distribution of Ti3SiC2 and graphite in the Cu matrix may be responsible to the obvious enhancement of the wear property the composite. Furthermore, the worn failure of the composite may be attributed to adhesive wear, abrasive wear and oxidation wear.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-05-24 Cooperative journals: 《计算机应用研究》
Abstract： It is significant to predict accurate protein melting temperature in protein engineering and drug design. In this paper, we proposed a novel weight-based dimensionality reduction algorithm, and applied it to obtain the input features of MLP model by using combination with global and sequential features as preliminary features. On blind test sets, the PCC value of predicted and experimental melting temperatures increased from 0.77 to 0.8, and RMSE value decreased from 0.17 to 0.16. The classification accuracy of predicted melting temperatures by our algorithm was significantly improved over the up-to-date service.
submitted time 2022-08-23 Cooperative journals: 《中国全科医学》
Abstract：
Subjects: Materials Science >> Materials Science (General) submitted time 2017-04-10 Cooperative journals: 《材料研究学报》
Abstract：采用电子束熔丝成形工艺制备 TC18 钛合金试件，研究了其柱状晶组织的生长和晶体取向的分布规律。 结果表明，用电子束熔丝成形工艺制备的 TC18 钛合金，其宏观金相组织为沿竖直方向生长的粗大柱状晶，以 外延生长的方式从熔池底部长大。受成形过程中特殊传热条件的影响，电子束熔丝成形钛合金组织中的 TC18 钛合金晶体形成特定方向的择优取向，α、β两相晶体取向分布都有明显的规律。在成形组织外延生长的 情况下，β相向α相晶体结构的转变具有继承性。其中大多数β晶粒有方向的强丝织构，柱状晶间β相的宏 观取向也有明显的特征，分布方向集中为 TD、LD 及法面 ND。β→α转变严格遵循 Burgers 取向关系，由同一个 母相β晶粒内析出的片层α/α满足 Burgers 取向关系所要求的取向差分布，柱状晶内的α主要有 6 种取向，β→α转 变过程有较强的变体选择。
Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： Nowadays , with the development of various running shoes and the progress in nunning shoe tech-nology , the incidence of nunning injury still remains high.Whether traditional running shoes ( motion con-trol shoes , cushioning shoes , and neutral stabilizers) or minimalist shoes , which have made a comeback inrecent years, can reduce injury rates and improve athletic performance still remains a great controversy.This paper classifies different nunning shoes and reviews the effects of footwear biomechanics.The aim ofthe review is to summarize the biomechanical mechanisms of different footwear and its effects on lower ex-tremity injuries and performance in order to provide suggestions on running shoes selection and prevent/ re-duce the risk of running-related injuries. Studies have shown that even customizing traditional cushioningshoes to fit the foot type does not reduce the incidence of nunning-related injuries.Minimalist shoes have the advantages of reducing joint torque and patella contact stress and strengthening the mechanical proper-ties of intrinsic foot muscles and Achilles tendons. One suggestion is that it is necessary to perform thegradual transformation project and try to coordinate with the strengthening exercises of lower limb muscles,such as foot core exercise.Future studies should focus on the underlying biomechanical mechanisms ofrunning shoes and lower limb injury , which can provide theoretical basis for reducing and preventing lowerlimb injuries and offer more suggestions for runners to choose their own running shoes.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-07-09 Cooperative journals: 《计算机应用研究》
Abstract： How to effectively utilize the rich transistor resources provided by multi-core to accelerate the execution of serial programs is currently a hot issue in research. 燭hread-Level Speculation (TLS) aims at making full use of multi-core resources and maximizing the potentially parallelism in serial code. 燗t present, TLS technology has been effectively utilized to parallelize several serial applications. However, speculative thread level parallelism in embedded applications has not yet been explored thoroughly. 燭herefore, eight selected representative embedded applications were analyzed in this paper from their potential parallelism and runtime characteristics(data dependency, thread granularity and parallel coverage) in loop-level speculation. 燭he experimental results show that: (1) for embedded applications, the speculative thread level parallelism is better than that in instruction level parallel technology, and the maximum speed up in experiment achieves 13.29. (2) In the field of embedded application, the technology can effectively utilize resources of 4 to 8 core computing.
Subjects: Biology >> Ecology submitted time 2018-01-20 Cooperative journals: 《生态学报》
Abstract：以江西杉木林红壤为研究对象，开展野外长期氮（N）、磷（P）添加控制试验，设置对照（CK）、N （50kg N hm-2 a-1）、P （50kg P hm-2 a-1）、NP （50kg N hm-2 a-1+50kg P hm-2 a-1）处理，分析N、P添加对土壤碳矿化速率（Cmin）、氮矿化速率（Nmin）和相关的β-1，4-葡萄糖苷酶（βG）和β-1，4-N-乙酰葡糖氨糖苷酶（NAG）动力学参数的影响。结果表明：（1） N添加明显降低了Cmin和Nmin，比CK分别减少了25%和18%；N添加减小了NAG的潜在最大酶活性（Vmax）、半饱和常数（Km）、催化效率（Vmax/Km），但差异不显著（P>0.05）；N添加显著增加了βG的Vmax、Km，但对Vmax/Km有抑制作用。（2） P输入（P、NP）较CK使NAG的Vmax、Km减小26%-60%；NP同时添加明显提高βG和NAG的Vmax/Km（PCmin和Nmin影响不显著（P>0.05）。（3）Cmin与土壤溶解性有机碳正相关，Nmin与pH显著正相关，与土壤NH4+-N、NO3--N显著负相关；βG和NAG的Vmax/Km均与NH4+-N、NO3--N负相关（PKm均与NH4+-N、NO3--N正相关（PVmax与NH4+-N、NO3--N正相关（PVmax与有机碳、全氮、全磷、有效磷负相关（PVmax/Km，对土壤Cmin和Nmin产生抑制作用；而NP添加增加土壤有效磷含量，增加土壤βG和NAG的Vmax/Km。
Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2017-12-27 Cooperative journals: 《南方医科大学学报》
Abstract： Objective To explore a new method for finite element modeling to achieve material property assignment based on in situ CT gray value in simulated osteotomies for deformities. Methods A CT scan dataset of the lower limb of a patient with extorsion deformity was obtained for three-dimensional reconstruction using Mimics software and preparing a solid model. In the CAD software, the parameters for osteotomy simulation were defined including the navigation axis, rotation angle and reference plane. The tibia model was imported to the FEA pre-processing software for meshing procedure and then exported to Mimics. All the segments of the tibia meshed model were assigned uneven material properties based on the relationship between CT gray values and material properties in the Mimics software. Finally, all the segments of the tibia model, reference axis and reference plane were assembled in the pre-processing software to form a full finite element model of a corrected tibia, which was submitted to resolver for biomechanical analysis. Results The tibia model established using our modeling method had inhomogeneous material properties based on CT gray values, and was available for finite element analysis for the simulation of osteotomy. Conclusions The proposed finite element modeling method, which retains the accuracy of the material property assignment based on CT gray value, can solve the reposition problem commonly seen in modeling via the routine method of property assignment and provides an efficient, flexible and accurate computational biomechanical analysis method for orthopedic surgery.
Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2017-12-07 Cooperative journals: 《南方医科大学学报》
Abstract： Abstract: Objective To investigate the application of 3D printing and digital technology in preoperative assessment and planning of internal fixation surgery for complex tibial plateau fracture. Methods Complex tibial plateau fractures and commonly used plates for tibial plateau were imaged using computed tomography (CT) to reconstruct the 3D fracture and plate models. The 3D models were used to perform virtual reduction and preoperative planning of internal fixation surgery with the most appropriate plates assisted by the 3D library of plates. According to the optimal plan, the 3D physical models of tibial plateau fractures and plates were 3D printed to simulate internal fixation operation. The effects of internal fixation were compared between the virtual surgery and the simulated surgery based on the 3D models. Results The effects of internal fixation in the simulated surgery based on the 3D models were consistent with those of the virtual surgery. No significant difference was found in the screw length between the two surgeries. Conclusion The combination of 3D printing and digital design can improve the effects of internal fixation for complex tibial plateau fractures.
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