排序方式: 共有63条查询结果,搜索用时 312 毫秒
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Carolyn A. Watters Kateryna V. Keefer Patricia H. Kloosterman Laura J. Summerfeldt James D.A. Parker 《Computers in human behavior》2013
Young’s (1998a) Internet Addiction Test (IAT) is one of the most commonly used measures of problematic Internet use. Although the instrument is being increasingly applied in research with adolescents, its measurement structure has not been systematically evaluated with pre-adult respondents. Because the results of previous factor-analytic studies with adults have been highly inconsistent, the present study applied both the traditional (simple-structure) and novel (bifactor) modeling approaches to derive the most optimal measurement structure of the IAT for adolescents. The results of exploratory and confirmatory analyses in a large Canadian sample of high-school students (N = 1948) converged on a bifactor model with a dominant global IA factor and two distinct sub-dimensions, each associated with a unique gender and problem behaviour profile. The discussion focuses on the implications of this bifactor structure for scale scoring and substantive theory on the nature and sources of individual differences in Internet addiction. 相似文献
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Yong Xu Tatsuya Hiramatsu Kateryna Tarasenko Toyoaki Nishida Yoshiyasu Ogasawara Takashi Tajima Makoto Hatakeyama Masashi Okamoto Yukiko I. Nakano 《AI & Society》2007,22(2):185-196
A key issue in social intelligence design is the realization of artifacts that can fluently communicate with people. Thus,
we proposed a two-layered approach to enhance a robot’s capacity of involvement and engagement. The upper layer flexibly controls
social interaction by dynamic Bayesian networks (DBN) representing social interaction patterns. The lower layer improves the
robustness of the system by detecting rhythmic and repetitive gestures. We designed a listener robot that can follow and record
humans’ explanation on how to assemble and/or disassemble a bicycle. The implementation of this system is described by assembling
the key algorithms presented in this paper. 相似文献
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Dmytro Nozdrenko Tetiana Matvienko Oksana Vygovska Kateryna Bogutska Olexandr Motuziuk Natalia Nurishchenko Yuriy Prylutskyy Peter Scharff Uwe Ritter 《International journal of molecular sciences》2021,22(13)
The biomechanical parameters of muscle soleus contraction in rats and their blood biochemical indicators after the intramuscular administration of water-soluble C60 fullerene at doses of 0.5, 1, and 2 mg/kg 1 h before the onset of muscle ischemia were investigated. In particular, changes in the contraction force of the ischemic muscle soleus, the integrated power of the muscle, the time to achieve the maximum force response, the dynamics of fatigue processes, and the parameters of the transition from dentate to smooth tetanus, levels of creatinine, creatine kinase, lactate and lactate dehydrogenase, and parameters of prooxidant–antioxidant balance (thiobarbituric acid reactive substances, hydrogen peroxide, and reduced glutathione and catalase) were analyzed. The positive therapeutic changes in the studied biomechanical and biochemical markers were revealed, which indicate the possibility of using water-soluble C60 fullerenes as effective prophylactic nanoagents to reduce the severity of pathological conditions of the muscular system caused by ischemic damage to skeletal muscles. 相似文献
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设计了一种通过检测生物活性点与皮肤完整区域之间温度差来监测药物疗效并优化心理疾病治疗的系统。该系统通过实时监控服药计量,以及时调整药量,从而提高治疗的有效性。系统采用两电极 Foll方法结合中该地形解剖参考点找到生物活性点,通过 DS18B20测量温度,利用 ATmega 32单片机对温度进行处理并实时显示温度差,进而通过温度差反应药效。本文数据证实了温差指标 BAP C7、Gi4与评估心理疾病严重程度的神经尺度之间的相关性。实验结果表明,温度差指标能够作为衡量药效的标准,通过监测温度差可以有效实现心理疾病药效的监测。 相似文献
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Yubo Zhang Ying Fu Jinchuan Jie Li Wu Kateryna Svynarenko Qingtao Guo Tingju Li Tongmin Wang 《Metals and Materials International》2017,23(6):1197-1203
An innovative horizontal continuous casting method was developed and successfully used to prepare copper-clad aluminum (CCA) rods with a diameter of 85 mm and a sheath thickness of 16 mm. The solidification structure and element distribution near the interface of the CCA ingots were investigated by means of a scanning electron microscope, an energy dispersive spectrometer, and an electron probe X-ray microanalyzer. The results showed that the proposed process can lead to a good metallurgical bond between Cu and Al. The interface between Cu and Al was a multilayered structure with a thickness of 200 μm, consisting of Cu9Al4, CuAl2, α-Al/CuAl2 eutectic, and α-Al + α-Al/CuAl2 eutectic layers from the Cu side to the Al side. The mean tensile-shear strength of the CCA sample was 45 MPa, which fulfills the requirements for the further extrusion process. The bonding and diffusion mechanisms are also discussed in this paper. 相似文献
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Bimetallic nanoparticles of noble metals are of high interest in imaging, biomedical devices, including nanomedicine, and heterogeneous catalysis. Synthesis, properties, characterization, biological properties, and practical applicability of nanoparticles on the basis of platinum group metals and the coin metals Ag and Au are discussed, also in comparison with the corresponding monometallic nanoparticles. In addition to the parameters that are required to characterize monometallic nanoparticles (mainly size, size distribution, shape, crystallographic nature, surface functionalization, charge), further information is required for a full characterization of bimetallic nanoparticles. This concerns the overall elemental composition of a bimetallic nanoparticle population (ratio of the two metals) and the internal distribution of the elements in individual nanoparticles (e.g., the presence of homogeneous alloys, core–shell systems, and possible intermediate stages). It is also important to ensure that all particles are identical in terms of elemental composition, that is, that the homogeneity of the particle population is given. Macroscopic properties like light absorption, antibacterial effects, and catalytic activity depend on these properties. The currently available methods for a full characterization of bimetallic nanoparticles are discussed, and future developments in this field are outlined. 相似文献
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Polymers derived from natural, minimally‐processed materials have recently emerged as a more sustainable alternative to synthetic polymers, with promising applications in biocompatible and biodegradable devices. Plasma‐enhanced deposition is well‐suited to one‐step, fast, and efficient synthesis of highly crosslinked inert polymers directly from natural resources, however, fabrication of biologically active polymers remains a challenge. Plasma processing parameters influence the properties such as surface energy, roughness, morphology, and chemical composition of deposited polymers and thus their final applications. This article reports on the important role of substrate temperature (TS) in the chemical composition, wettability, refractive index, and crosslinking density of plasma polymers derived from terpenoids. Experiments are conducted as a function of deposition power Pd, and substrate temperature, TS. TS varied from 40 to 280 °C and is externally controlled. Atomic force microscopy analysis reveals the change in deposition mechanism attributed to shadowing effect at higher TS and Pd. Increase in band gap (Eg) with high Ts deposition for terpenoid based plasma polymers is observed. Swelling behavior analyzed by in situ ellipsometry affirms the enhanced crosslink density with increasing deposition rate. Fourier transform infrared analysis exhibits the formation of additional chemical moieties with increasing TS. Increase in deposition rate with increasing TS at higher Pd supports the theory of direct incorporation of depositing particles as dominant mechanism of plasma polymerization in this study. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 45771. 相似文献