Subjects: Psychology >> Management Psychology submitted time 2019-09-29
Abstract： Trust is a crucial part of interpersonal relationships within work environments. Previous research has revealed that feeling trusted, or “the perception that another party is willing to accept vulnerability to one’s actions,” by one’s supervisor benefits both subordinates and organizations in various ways such as enhancing organization-based self-esteem and improving individual and organizational performance. While extant research has provided insightful knowledge to help us understand the beneficial effects of feeling trusted, we know little about its potential drawbacks. We suggest that scholars may have overstated the benefits of feeling trusted and overlooked its potential costs. Thus, several important questions are arisen: When dose feeling trusted induce employees subsequent counterproductive work behavior (CWB), and Why? Drawing upon self-evaluation theory and trust literature, we propose that feeling trusted by their supervisors may promote employees’ psychological entitlement, which leads to subsequent CWB. Furthermore, we consider the perceived rarity of trust as a boundary condition and suggest that when employees perceive the rarity of trust is high, feeling trusted is more likely to make them feel psychologically entitled, thus leading to CWB. To test our theoretical model, we conducted three studies, including two experiments (i.e., Study 1 and 2) and one multi-wave, multi-source field study (i.e., Study 3) among diverse samples. In Study 1, we invited 115 full-time employees through the alumni networks of several large universities in China to participate our experiment. Participants were randomly assigned to one of two experimental conditions: the feeling trusted condition (n = 58) versus the control condition (n = 57). Feeling trusted was manipulated by the critical incident technique. Each participant was required to recall and describe a recent interaction with their supervisor. Next, participants completed an ostensibly unrelated task (filler task) and reported psychological entitlement, manipulation check, and demographics. In Study 2, we recruited 145 full-time working adults as participants from the United States using Amazon’s Mechanical Turk. Participants first reported the perceived rarity of trust in their organizations. Then, they were randomly assigned to one of two experimental conditions (the feeling trusted condition [n = 73] versus the control condition [n = 72]) and were subjected to the same manipulation and questionnaire as those defined in Study 1. In Study 3, we employed a multi-wave, multi-source design to test our full model in a field setting using a Chinese employee sample. At Time 1, the employees reported feeling trusted, perceived rarity of trust, psychological entitlement, and demographics. Approximately one week later (Time 2), their supervisors were invited to rate subordinates’ CWB. The final sample included 187 employees from 60 workgroups. The results of the studies revealed that feeling trusted positively influenced subordinates’ psychological entitlement, which in turn enhanced their subsequent CWB. Subordinates perceived rarity of trust moderated the effect of feeling trusted on psychological entitlement. Furthermore, subordinates perceived rarity of trust moderated the indirect effect of feeling trusted on CWB. That is, the positive indirect effect of feeling trusted on CWB via subordinates’ psychological entitlement was significant and positive when perceived rarity of trust was high and did not exist when perceived rarity of trust was low. This research makes several important contributions. First, we challenge the consensus regarding the universally positive effects of trust by suggesting that feeling trusted may have the potential to induce subordinates CWB. In doing so, this research provides a more dialectical perspective in understanding the effects of feeling trusted. Second, not only do we examine the potentially negative effects of feeling trusted, but we also examine when and why this effect unfolds. By exploring the dynamics of feeling trusted, we answer Bare et al.’s call for more research on feeling trusted. Finally, this research contributes to CWB literature by identifying an important but neglected antecedent of CWB in the workplace. We suggested that beyond leaders’ negative behaviors (e.g., abuse and injustice), their positive behaviors (i.e., expressed trust) may lead to subordinates’ CWB. "
Subjects: Psychology >> Management Psychology Subjects: Psychology >> Personality Psychology submitted time 2019-09-29
Abstract： Extant literature has long documented the important role of employee voice behavior with such literature pointing to leadership as a vital antecedent to employee voice behavior. However, one relatively unexplored area in this stream or research is the understanding of, how leader’s voice endorsement affects employees’ voice behavior. Prior studies have investigated the relationship between leader’s behavior and employee voice through a motivational theoretical perspective or a cognitive theoretical perspective. First, the voice literature has drawn on social exchange theory, conservation of resources theory and expectancy theory to explain how employee voice can be triggered through leader behavior that enhances employee motivation to voice. Second, the literature has also drawn on implicit voice theory, information processing theory, and social cognition theory to understand how the leader influences employee voice through a cognitive lens. However, this results in a fragmented literature with the need for an overarching theory that links these perspectives. Therefore, we provide an integrated framework through the self-organizing goal system theory of human psychology. In doing so, we develop a goal self-organization framework of employee voice behavior which integrates the cognitive and motivational approaches to voice. Based on this framework, how employees self-organize their goal system can function as the core mechanism that influences employee’s voice. Further, we explain how leader’s voice endorsement can promote employee voice using this framework. Empirically, we tested the hypotheses that both employee’s work meaningfulness and voice efficacy mediate the positive relationship between leader’s voice endorsement and employee’s promotive voice and prohibitive voice. A two-wave survey was conducted in an internet-based financial company operating in Tianjin and Zhejiang. We used existing, validated measures with Chinese questionnaires as well as the standard translation and back-translation procedures to assure item wording validity. Separated surveys were distributed to the focal employees and their immediate supervisors at two different time points. At time 1, supervisors reported their voice endorsement behaviors towards particular subordinate. Two weeks later, focal employees reported their work meaningfulness, voice efficacy, and voice behavior. A sample of 73 supervisors and 236 subordinates’ valid responses was collected. We assessed the discriminant validity with confirmatory factor analysis and tested our hypotheses using Mplus and bootstrap analysis. Results of the confirmatory factor analysis showed good discriminant validity for the key variables, as well as a good fit between the hypothesized model and the data. In support of our hypotheses, the results revealed a significant positive relationship between leader’s voice endorsement and employee voice behavior (including promotive voice and prohibitive voice). Additionally, for both types of employee voice behavior, the aforementioned relationship was mediated by employee’s work meaningfulness and voice efficacy, indicating that there are dual psychological mechanisms: specifically, both motivational and cognitive, processes. Our results indicated that employee’s work meaningfulness and voice efficacy fully mediated the relationship between leader’s voice endorsement and both types of employee voice behavior. To sum up, this study contributes to theory by providing a goal self-organization framework to integrate the fragmented literature on voice from both a motivational and cognitive perspective. Drawing on the theory of human psychology, we integrate the cognitive and motivational perspective by introducing psychological goal system. Furthermore, our study extends the voice literature by showing how leader’s voice endorsement promotes employee voice. Based on this goal self-organization framework, we show that leader’s voice endorsement promotes the attainment of employee’s psychological goals, which in turn triggers and regulates the dual psychological mechanism, and drives individuals towards the fulfillment of their psychological goals. This framework extends our understanding of the leader endorsement-employee voice relationship and contributes to theoretical integration of the voice literature as well as surfaces implications for practice. The implications, limitations and future directions of the study are discussed. "
Subjects: Psychology >> Cognitive Psychology Subjects: Psychology >> Experimental Psychology submitted time 2019-09-28
Abstract： Threat stimuli catch our attention when compared with neutral stimuli called attention bias, which includes facilitating attention engagement and difficult attention disengagement to threat. Acute stress influences our attention to threat. However, we do not know whether acute stress can enhance facilitating attention engagement or impair attention disengagement toward threat. Therefore, the present study investigated whether attention engagement to threat is enhanced or attention disengagement to threat is weakened when people are stressed. Thirty-six healthy male adults were randomly assigned to a stress group (n = 18) and a control group (n = 18). The stress group underwent socially evaluated cold-pressor test (SECPT), whereas the control group underwent a warm water control protocol. The dot-probe task was used to measure the attention bias toward threat. Event-related potentials (ERPs) were used in conjunction with reaction time measures to investigate the time course of attention to threat in the dot-probe task. The N2-posteior-contralateral (N2pc) component measured the initial shift of visual attention to the threatening stimulus, whereas the sustained posterior contralateral negativity (SPCN) component measured the maintenance of visual attention to the threatening stimulus. Reaction time, accuracy rate, and the electroencephalography data of the participants were recorded during the dot-probe task. The state anxiety questionnaire and saliva were acquired at five time points, such as 85 and 70 minutes before the SECPT, immediately before and after the dot-probe task, and 70 minutes after the SECPT. The SECPT successfully induced stress response. Participants in the stress group showed stronger state anxiety and Hypothalamic-Pituitary-Adrenal axis response indicated by increased salivary cortisol concentration after the SECPT than the control group. In addition, no significant differences were found before the SECPT. At the behavioral level, the attention disengagement in the stress group was slower than in the control group. Regarding ERPs, we found a greater amplitude of SPCN (300~600 ms after cue) in the stress group than in the control group. However, no significant effect was found on the amplitude of N2pc between stress group and control group. These results indicate that attention disengagement toward threat is impaired under acute stress situations.
Subjects: Psychology >> Developmental Psychology submitted time 2019-09-28
Abstract： Brain imaging studies have found that the athletes engaged in racquet sports showed different brain structure and function based on expert-novice paradigm. However, the present findings cannot fully interpret the role of sport experience in brain plasticity. For example, it is still not clear whether such differences in brain structure are due to training experience or innate differences. The aim of the present study was to investigate whether young adults' brain structures are influenced by a short period of badminton training experience. A group of young adults (23 ~ 27 years) without any professional or amateur sports training were recruited to take part in the experiment. They were randomly divided into either the experimental group (21 non-athletes) or the control group (17 non-athletes). Participants in the experimental group were trained for 12 weeks (one hour each time and three times each week), and participants in the control group did not attend any regular sport trainings during this period. Structure imaging and diffusion tensor imaging (DTI) techniques were used to assess the effects of badminton training on the brain structural plasticity in young adults. T1 images and DTI data for all participants were collected before and after the intervention. Voxel-based morphometry (VBM) and Tract-based spatial statistics (TBSS) were used to perform a whole-brain analysis of the T1 and DTI data respectively. A 2 (participant group: experimental group, control group) × 2 (test time: pretest, posttest) repeated measure ANOVA was used to perform statistical analysis. The results showed that there were significant interactions between participant group and test time for the gray matter volume in the left inferior occipital lobe, middle temporal gyrus and inferior temporal gyrus. Specifically, participants in the experiment group exhibited increased gray matter volume in the above brain regions after the training, whilst participants in the control group showed decreased gray matter volume in the left middle temporal gyrus at posttest as compared to pretest. Furthermore, for the participants in the control group, there were no significant differences between pretest and posttest in the volume of left inferior occipital lobe and inferior temporal gyrus. In relation with the white matter microstructures, the experiment group had increased fractional anisotropy (FA) in the bilateral posterior limb of internal capsule and the superior corona radiate in posttest as compared to pretest. And the increased FA was induced by decreased radial diffusivity (RD). In contrast, the control group had decreased FA and increased RD in the above fibers at posttest relative to pretest. Taken together, these results suggest that badminton training increased the gray matter volume in the brain regions related to visual motion perception processing and increased the myelin sheath thickness of the fibers associated with motor learning. These results imply that in early adulthood, the gray matter and white matter of the brain might have plasticity to some extent.
Subjects: Psychology >> Medical Psychology Subjects: Computer Science >> Other Disciplines of Computer Science submitted time 2019-09-28
Abstract： Machine learning is a promising approach for mental disorders. In recent years, machine learning based on T1 weighted imaging and Diffusion Tensor Imaging (DTI) data has been used to investigate the psychopathology and underlying mechanisms of schizophrenia patients and high-risk population. The findings from the previous literature suggest that structural features of frontal lobe and temporal lobe can improve classification performance. In addition, the combination of behavioural performances and the features of brain structure is superior to the single-modality structural images on classification accuracy. However, the existing empirical studies classifying schizophrenia patients or high-risk population from controls are limited in sample size and generalization ability. " "
Subjects: Psychology >> Other Disciplines of Psychology submitted time 2019-09-27
Abstract： "
Subjects: Psychology >> Cognitive Psychology submitted time 2019-09-25
Abstract： Oxytocin is known as the "hormone of love" and is closely associated with attachment.Previous studies have proved that oxytocin from different sources has different effects on the interpersonal adaptability of individuals with insecure attachment, mainly shown in the following ways that the lower levels of endogenous oxytocin, the worse the interpersonal adaptibility among insecurely attached individuals; Exogenous oxytocin enhanced the interpersonal adaptability among avoidantly attached individuals, but reduced the interpersonal adaptability among individuals with high anxious attachment scores; A and G Alleles were associated with interpersonal adaptibility among insecurely attached individuals. In addition, attachment theory and the social salience hypothesis are also used to explain the above effects. Defensive exclusion, external contextual factors and individual differences are also play a regulatory role that cannot be ignored. We should compare the differences between the oxytocin receptor gene and the interpersonal adaptability among insecurely attached individuals in the future. Moreover, the effects of oxytocin may have gender differences on interpersonal adaptability among individuals with insecure attachment. However, till now there are few related study focused the above question, thus it deserved to be discussed more in the future. In order to enhance the ecological validity of oxytocin related researches, future researches focused on the effects of oxytocin on the interpersonal adaptability of insecurely attached individuals should be continued studying in the process of interpersonal interaction.
Subjects: Psychology >> Cognitive Psychology submitted time 2019-09-25
Abstract： Feedback plays a crucial role in real life. Learning from the information feedback, human being could mater general skills and knowledge for adapt to the environment. As an important factor of feedback processing, feedback interval means the duration between initiation of behavior and the appearance of feedback stimulus. However, the prior research about how the feedback interval modulated feedback processing did not reach consistent viewpoint. Introduced both the behavioral and ERP studies about how feedback interval affects feedback processing, and analyzed the reasons for the results discrepancies among these studies. Finally, we propose the necessity to standardize the definition of feedback interval and the combination of the behavioral and electrophysiological methods in further research. "
Subjects: Psychology >> Management Psychology submitted time 2019-09-25
Abstract： Work-related rumination (WRR) refers to conscious, recurring work-related thoughts that occur without being asked to do so. WRR is divided into two dimensions: work-related emotional rumination and work-related problem-solving pondering. The influence of WRR on individual health, work and happiness is a double-edged sword. Perseverative cognition theory, cognitive activation theory of stress and cognitive resource perspective theory provide explanations for the internal mechanism of positive and negative effects of WRR. Researchers should analyze boundary conditions affecting the double-edged sword effect, seek the route of reducing its negative effects and increasing the positive effect, in the future. Besides, researchers should also expand the analytical perspective of psychological mechanism of the double-edged sword effect, as well as the functional level of the effect. "
Subjects: Psychology >> Management Psychology submitted time 2019-09-24
Abstract： Idiosyncratic deals (simplified as “i-deals”) refer to personalized employment arrangements in order to meet both employees and their employers’ benefits. Drawing on self-determination theory (SDT), the current study investigated the relationship between i-deals and the two important employee work outcomes (i.e., proactive career behavior and creativity) by focusing on the mediating role of psychological needs satisfaction (i.e., competence need satisfaction, autonomy need satisfaction and relatedness need satisfaction) and the moderating role of workload. Three time points of data were collected from 230 supervisor-subordinate dyads in 40 work teams within Guangzhou and Shenzhen. At Time 1, subordinates reported i-deals and provided demographic information. At Time 2, subordinates responded to measures of workload, competence need satisfaction, autonomy need satisfaction, and relatedness need satisfaction. At Time 3, supervisors rated their subordinates’ creativity, and employees self-reported their own proactive career behavior. Results showed that: (1) i-deals was positively related to all three forms of employees’ psychological needs satisfaction (competence need satisfaction, autonomy need satisfaction, and relatedness need satisfaction); (2) i-deals was positively associated with both employee proactive career behavior and creativity; (3) competence need satisfaction mediated the relationship between i-deals and the two employee work outcomes (i.e., proactive career behavior and creativity), whereas the mediating effect of autonomy and relatedness need satisfaction was not significant; (4) workload strengthened the positive relationship between i-deals and employee competence / autonomy need satisfaction, as well as the indirect effect of i-deals on proactive career behavior and creativity via competence need satisfaction. The current study contributes to the literature in two aspects. First, drawing on SDT, we identified the mediating mechanism of psychological need satisfaction (competence need satisfaction in specific) in understanding the influence of i-deals on employee’s proactive career behavior and creativity. Second, in testing the moderating role of workload on the effects of i-deals and its outcomes, we clarified the boundary condition of the positive effects of i-deals. The theoretical contributions and practical implications of the results were discussed.
Subjects: Psychology >> Clinical and Counseling Psychology Subjects: Psychology >> Psychological Measurement submitted time 2019-09-23
Abstract： Mental health literacy(MHL) is important for improving mental health. In a narrow sense, it refers to the knowledge and beliefs about mental disorders which aid their recognition, management or prevention.In a broad sense, it refers to the comprehensive use of mental health knowledge, skills and attitudes to maintain and promote mental health. MHL is often measured by Vignette case questionnaire, and unidimensional or multi-dimensional scales. Interventions including social campaigns, school education, self-service application and Mental Health First Aid training can effectively improve MHL.Elements of MHL, including psychological health knowledge, mental disorder recognition, emotional regulation, anti-stigma, and help-seeking attitude etc, are positively related to mental health. Future research can be carried out in such aspects as constructing the MHL evaluation system, exploring the mechanism of its influence, expanding the coverage of research, and strengthening empirical intervention research.
Subjects: Psychology >> Cognitive Psychology submitted time 2019-09-22
Abstract： " Academia has a long discussion of self-deception. Self-deception provides fertile ground for research in biology, philosophy, and psychology. Philosophers theoretically discuss the possibility and conditions of the existence of self-deception. Biologists study the applicability of the self-deception from the evolutionary perspective. Psychologists want to provide empirical evidence for the existence of self-deception.Nevertheless, the presentation of self-deception remains controversial. Therefore, an empirical study of self-deception with direct evidence is required to tackle the existence of self-deception. A large number of studies have investigated the existence of self-deception. The results showed that motivation, external or internal, and cognitive vagueness are the triggers of the existence of self-deception. However, it remains unknown whether self-deceived people believe in their own deception interacts with the effect of cognitive vagueness and motivation on self-deception. In this paper, we investigate whether self-deceived people believe in their own deception influences the self-deception and moderates the effect of cognitive vagueness and motivation on self-deception. We further propose two forms of self-deception: unconscious and conscious self-deception, where those unconscious self-deceived people believe in their own deception while those conscious self-deceived people do not. As motivation has different effects on the two forms of self-deception, we futher investigate wether the two forms of self-deception share the same processing mechanisms. Following the research paradigm of Chance et al.(2011), we investigated the above hypotheses in three experiments. In Experiment 1, we improved the research paradigm used by Chance et al.(2011), and we showed that self-deception could be categorized as conscious self-deception and unconscious self-deception. Experiment 2 showed that cognitive vagueness positively and negatively associated with unconscious and conscious self-deception respectively. Experiment 3 illustrated that motivation increased the conscious self-deception, but had no impact on unconscious self-deception. The diverse effects of motivation and cognitive vagueness on the unconscious and conscious self-deception suggest that two forms of self-deception are driven by different processing mechanisms.
Subjects: Psychology >> Other Disciplines of Psychology submitted time 2019-09-22
Abstract： Death awareness refers to thinking about and the recognition of the inevitability of personal death. As a critical component of the human-unique ability of autonoetic consciousness, death awareness can be viewed as a cognitive adaptation for time management. We hypothesize that activating death awareness may affect intertemporal choice, in which people make tradeoffs between rewards across different time points. Such effects of death awareness on intertemporal choice may be mediated by time perception, a subjective assessment of the speed of time passage. In this research, we investigate the impact of death awareness on time perception and intertemporal choice, and the relationships among them. Study 1 examined the relationship between death awareness and time estimation. Eighty-three college students were randomly assigned to either a death awareness activation group where mortality was made salient to the participants or a control group where the participants imagined their toothache experience. After a word-search distraction task, the participants in both groups completed a time-passage (400ms, 800ms, 1200ms, 1600ms) estimation task. The results showed that the participants in the group of death awareness activation gave significantly shorter estimates than the participants in the control group. Study 2 (n = 123) extended the measure of time perception to a more extended period and also measured the delay discounting rate of the participants from their intertemporal choices between a smaller-and-sooner reward and a larger-and-later reward. The participants were randomly assigned to either a death awareness activation group or a toothache awareness activation group. The participants then indicated how long ten years was to them by marking on a line with the statement “10 years is very short” on the left end side of the line and the statement “10 years is very long” on the right end side. The participants in the death-awareness activation group marked the line closer to the left end (“life is short”) than those in the control group. As predicted, the participants in the death-awareness activation group had a lower delay discounting rate and were more future-oriented in making intertemporal choices. Moreover, bootstrapping analysis revealed a partial mediation effect of time-passage estimation between death awareness and delay discounting. In conclusion, death awareness serves adaptive functions in time management. Activating death awareness makes people feel that time passes more quickly and promotes future-oriented decisions.
Subjects: Psychology >> Cognitive Psychology submitted time 2019-09-19
Abstract： Because of the lack of disease awareness in depressed patients and the lack of early screening methods, most patients had developed to major depressive disorder when they were first diagnosed with depression. In order to improve the current situation, machine learning has been gradually used in some aspects of depression recently years, including early prediction, early recognition, auxiliary diagnosis, and treatment. In the application, the factors that affect the accuracy of machine learning model include the type and size of sample set, feature engineering, algorithm type, etc. In the future, machine learning should be further integrated into the health care system and mobile applications, continuously optimizing the machine learning model, fully mining patient health data to improve depression-related problems in terms of the prevention, identification, diagnosis, treatment and so on.
Subjects: Psychology >> Applied Psychology submitted time 2019-09-18
Abstract： " Age-related differences in affective meanings of words are widely used by researchers studying emotions, word recognition, attention, memory and text-based sentiment analysis. However, no Chinese affective norms for older adults are available. This article firstly presents the available large-scale Chinese affective norms for 2, 061 4-character words rated in labs by 114 older and 150 younger adults (CAN4Age) who evaluated these words on four dimensions: valence, arousal, dominance, and familiarity. We also compiled 4 lexical variables for each word, including word frequency, word complexity, character frequency and character complexity. In general, older adults tend to evaluate emotional words more extremely than younger adults do. That is, they rate positive words as more positive and negative words as more negative than younger adults do. Specifically, older adults tend to perceive positive words as more arousing and less controllable and negative words as less arousing and more controllable than that of younger adults. This age-related database will enable researchers to study how emotional characteristics of words influence their cognitive processing, and how this influence evolves with age in Chinese. This age-related difference study on affective norms not only provides insights to cognitive neuroscience, gerontology and psychology in experimental studies, but the produced affective word collection also has great value as a resource for affective analysis in natural language processing applications. These norms can be downloaded as supplemental materials with this published article. "
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Subjects: Astronomy >> Astrophysical processes submitted time 2019-09-18 Cooperative journals: 《天文研究与技术》
Abstract： 全天相机云图在天文观测领域具有重要价值，但云图所含噪声会造成不良影响。本文先后分析了星光噪声、月光噪声、日光噪声、雷电噪声、反光噪声和特殊噪声等，并总结出不同类型噪声的分布、区域大小等方面的特点，最后结合与云层的相对位置关系提出了边界阈值法、时间轴法、反比例线性变换等8种图像处理去噪算法，并形成一个完整的去噪系统。通过实验对不同的算法加以比较，得出不同噪声情况下的最佳去噪方案。实验结果表明，该系统可以有效去除常见噪声，基本保持云层和天空的信息完整性，可简单便捷实现云图去噪。
Subjects: Astronomy >> Astrophysical processes submitted time 2019-09-18 Cooperative journals: 《天文研究与技术》
Abstract：测量集（MeasurementSet，MS）文件是成为射电天文领域的重要存储文件格式，并逐渐成为射电天文数据存储、分析与共享的标准格式，得到越来越多的天文数据处理软件如CASA、WSCLEAN等的支持，在ALMA、LOFAR等诸多射电望远镜系统中应用。但长期以来，MS格式在国内应用较少，技术规范文档非常缺乏。本文结合SKA工程桥接阶段相关工作需要，对MS格式的基本概念、目录结构和字段设计进行了介绍，在此基础上讨论了利用python-casacore调用底层casacore生成MS文件的方法,并将此功能封装到当前SKA的算法参考库（Algorithm Reference Library, ARL）。文中给出了利用ARL仿真观测生成MS文件的实例，并通过CASA软件对生成的MS文件成像，经过结果比对，验证了MS文件的正确性。本文的工作为SKA后续的成像实验、观测模拟和文件存储都提供了关键的保障，在满足SKA工程桥接阶段工作需要的同时，也为国内外射电天文数据处理工作提供了参考。
Subjects: Astronomy >> Astrophysical processes submitted time 2019-09-18 Cooperative journals: 《天文研究与技术》
Abstract： 使用了一个具有（准）同时性宽带能谱数据的Fermi耀变体样本，对其进行了同步和逆康普顿峰峰值参量、康普顿主导以及高能谱指数等参量之间的相关性分析。以获得耀变体整体和子类相关性之间差异来源、耀变体喷流中粒子冷却的主导机制，和电子能谱形状等方面的解释。分析结果表明耀变体的整体相关性至少有部分来自于平谱射电类星体和BL Lac天体由于物理性质不同而在参数平面上具有不同分布区域这一特性贡献，因此针对两个子类的相关性分析是必需的。BL Lac天体为快冷却机制。谱指数图的结果支持对数抛物线形状的电子能谱。
Subjects: Astronomy >> Astrophysical processes submitted time 2019-09-18 Cooperative journals: 《天文研究与技术》
Abstract： 各类大型巡天项目产生了海量天文数据，因此需要研究适用于大规模数据的光谱自动处理方法。传统的基于谱线检测或BPT图的星系光谱分类方法难以直接应用于星系光谱自动分类pipeline，相比之下基于机器学习的光谱自动分析更适用于海量天文数据的分类研究。本文提出了一种基于双层聚类的星系光谱分析方法。第一层采用k均值聚类算法将星系光谱聚为吸收线星系和发射线星系，第二层使用CLARA（Clustering LARge Applications）聚类算法将发射线星系聚为5簇。对LAMOST DR5的星系数据进行实验，其结果表明：（1）第一层k均值聚类能够成功将星系光谱分为吸收线星系和发射线星系，聚类簇与基于谱线检测的分类结果基本一致。（2）第二层CLARA聚类结果能够在BPT图中反映出不同的星系类型。（3）光谱聚类结果与颜色星等图分类存在预期的相关性。（4）k均值聚类和CLARA聚类能够适用于大规模数据自动分析处理，聚类结果能够很好地反映出星系的物理性质和演化过程，簇心数据可以为光谱自动分类pipeline提供模板。
Subjects: Astronomy >> Astrophysical processes submitted time 2019-09-18 Cooperative journals: 《天文研究与技术》
Abstract：日冕物质抛射（Coronal Mass Ejection，CME）是一种规模巨大，程度剧烈的爆发现象，是影响地球的主要太阳爆发活动。由于这种爆发现象会对地球环境造成严重干扰，因此CME的探测对预报灾害性空间天气具有重要意义。为了更清楚地梳理目前存在的CME检测方法，文章将对典型的方法进行分析总结。首先，介绍日冕物质抛射及其特征；然后，从基于手工方法和自动检测方法两方面对CME检测进行概述和分析；最后，讨论目前算法存在的一些问题，进而提出未来的研究方向。
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