26 research outputs found

    The Role ofSocial Capital and Shared Mental Model inVirtualR&D Teams

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    The working style of virtual R&D team is becoming more and more popular, so lots of researchers concern about the performance of virtual R&D teams. Shared mental model (SMM) is a concept in psychology which is defined as a common thinking style developed by similar experience and individual mental models. In this paper, we consider two types of SMM, which are task-related SMM and member-related SMM, and hope to investigatewhether SMM could influence the performance of R&D virtual teams and the antecedent relationship of SMM using social capital theory. The research results indicate that we could use social capital theory to explain the antecedents of task-related SMM and member-related SMM.Wealso find that task-related SMM and member-related SMM are both positively related to virtual R&Dteam performance. This researchemphasizes the importance of the notice on SMM in virtual team establishment, which should be paid more attentions

    Dual-Adoption Behaviors of Social Media in Workplace: The views from UGT and TAM

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    Social media has become an emerging trend in the work of enterprises and organizations, but few studies have explored the specific behavior and its influence mechanism of social media adoption in the workplace. This paper divides the social media use behavior in the work context into two types: reinforced use and varied use. Based on the technology acceptance model, this paper combines TAM and motivation theory to build a research model on the motivation of using social media in work and its influence on the use behavior. Through empirical analysis of questionnaire data in practical work, the research results show that the three motivations positively influence adoption intention through the mediation of perceived usefulness, and the intention is positively correlated with the two behaviors

    Research on the Adoption Intention of Users\u27 Knowledge Payment: the Integrated Model of UGT and TAM

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    Knowledge payment based on social media has become a new business model. The research on adoption intention of users could help the users recognize the influence of knowledge payment. Meanwhile, the research is helpful for the suppliers to standard and develop this business model further. According to the social media nature of knowledge payment, use and gratification theory and technology acceptance model were chosen as the theory basis to build the research model of users\u27 adoption intention on knowledge payment. 315 valid samples were collected from questionnaire. Structural equation model was used as the model analysis tool. It is found that the main motivations and purposes of users\u27 adoption on knowledge payment are the willingness to get cognitive gratification, hedonic gratification, and convenience gratification of the users. Meanwhile, in order to increase the users\u27 adoption intentions, knowledge content represented by perceived usefulness is critical, operation process represented by perceived ease of use is the method, but perceived payment price is not the key factor

    Efficient characteristics of exchange coupling and spin-flop transition in Py/Gd bilayer using anisotropic magnetoresistance

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    The interlayer antiferromagnetic coupling rare-earth/transition-metal bilayer ferrimagnet systems have attracted much attention because they present variously unusual temperature-and field-dependent nontrivial magnetic states and dynamics. These properties and the implementation of their applications in spintronics highly depend on the significant temperature dependence of the magnetic exchange stiffness constant A. Here, we quantitatively determine the temperature dependence of magnetic exchange stiffness A_{Py-Gd} and A_{Gd} in the artificially layered ferrimagnet consisting of a Py/Gd bilayer, using a measurement of anisotropic magnetoresistance (AMR) of the bilayer thin film at different temperatures and magnetic fields. The obtained temperature dependence of A_{Py-Gd} and A_{Gd} exhibit a scaling power law with the magnetization of Gd. The critical field of spin-flop transition and its temperature dependence can also be directly obtained by this method. Additionally, the experimental results are well reproduced by micromagnetic simulations with the obtained parameters A_{Py-Gd} and A_{Gd}, which further confirms the reliability of this easily accessible technique.Comment: 5 pages, 4 figure

    Transfer of stripe rust resistance from Aegilops variabilis to bread wheat

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    In terms of area, the bread wheat producing regions of China comprise the largest area in the world that is constantly threatened by stripe rust epidemics. Consequently, it is important to exploit new adultplant resistance genes in breeding. This study reports the transfer of stripe rust resistance from Aegilops variabilis to bread wheat resulting in resistant line, TKL2(R). Genetic analysis of the segregating populations derived from a cross between TKL2(R) and a susceptible sister line, TKL2(S), indicated that the adult-plant resistance to Puccinia striiformis f. sp. tritici in TKL2(R) is conferred by a single dominant gene. This gene provided resistance to physiological races currently endemic to China, thus indicating its potential usefulness in wheat breeding.Keywords: Aegilops variabilis, gene transfer, Puccinia striiformis f. sp. tritici, Triticum aestivum, wide hybridizatio

    Low temperature and temperature decline increase acute aortic dissection risk and burden: A nationwide case crossover analysis at hourly level among 40,270 patients.

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    Background: Acute aortic dissection (AAD) is a life-threatening cardiovascular emergency with high mortality, so identifying modifiable risk factors of AAD is of great public health significance. The associations of non-optimal temperature and temperature variability with AAD onset and the disease burden have not been fully understood. Methods: We conducted a time-stratified case-crossover study using a nationwide registry dataset from 1,868 hospitals in 313 Chinese cities. Conditional logistic regression and distributed lag models were used to investigate associations of temperature and temperature changes between neighboring days (TCN) with the hourly AAD onset and calculate the attributable fractions. We also evaluated the heterogeneity of the associations. Findings: A total of 40,270 eligible AAD cases were included. The exposure-response curves for temperature and TCN with AAD onset risk were both inverse and approximately linear. The risks were present on the concurrent hour (for temperature) or day (for TCN) and lasted for almost 1 day. The cumulative relative risks of AAD were 1.027 and 1.026 per 1¬įC lower temperature and temperature decline between neighboring days, respectively. The associations were significant during the non-heating period, but were not present during the heating period in cities with central heating. 23.13% of AAD cases nationwide were attributable to low temperature and 1.58% were attributable to temperature decline from the previous day. Interpretation: This is the largest nationwide study demonstrating robust associations of low temperature and temperature decline with AAD onset. We, for the first time, calculated the corresponding disease burden and further showed that central heating may be a modifier for temperature-related AAD risk and burden. Funding: This work was supported by the National Natural Science Foundation of China (92043301 and 92143301), Shanghai International Science and Technology Partnership Project (No. 21230780200), the Medical Research Council-UK (MR/R013349/1), and the Natural Environment Research Council UK (NE/R009384/1)

    Mechanical Characterization and Impact Damage Assessment of Hybrid Three-Dimensional Five-Directional Composites

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    The effects of braided architecture and co-braided hybrid structure on low-velocity response of carbon-aramid hybrid three-dimensional five-directional (3D5d) braided composites were experimentally investigated in this study. Low-velocity impact was conducted on two types of hybridization and one pure carbon fiber braided reinforced composites under three velocities. Damage morphologies after low-velocity impact were detected by microscopy and ultrasonic nondestructive testing. Interior damages of composites were highly dependent on yarn type and alignment. Impact damage tolerance was introduced to evaluate the ductility of hybrid composites. Maximum impact load and toughness changed with impact velocity and constituent materials of the composites. The composite with aramid fiber as axial yarn and carbon fiber as braiding yarn showed the best impact resistance due to the synergistic effect of both materials. Wavelet transform was applied in frequency and time domain analyses to reflect the failure mode and mechanism of hybrid 3D5d braided composites. Aramid fibers were used either as axial yarns or braiding yarns, aiding in the effective decrease in the level of initial damage. In particular, when used as axial yarns, aramid fibers effectively mitigate the level of damage during damage evolution

    Complete chloroplast genome and phylogenetic analysis of a wild grass, Hordeum roshevitzii Bowden

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    The complete circular chloroplast (cp) genome of wild Hordeum roshevitzii Bowden was sequenced and reported in this study. The complete chloroplast genome of wild H. roshevitzii was 12,753‚ÄČbp in length, including a pair of inverted repeat regions (IRA/IRB) of 21,587‚ÄČbp separated by one small single-copy (SSC) region of 12,753‚ÄČbp and one large single-copy (LSC) region of 81,138‚ÄČbp. A total of 133 genes, including 85 protein-coding genes (PCGs), 40 transfer RNA genes, and 8 ribosomal RNA genes were predicted from the cp genomes. The overall GC content of the cp genome was 38.25% and the corresponding values of the IR, SSC, and LSC were 43.89%, 32.19%, and 36.21%. The phylogenetic analysis of H. roshevitzii determined that H. roshevitzii was clustered closely with Hordeum bogdanii