One of the most efficient predator-prey models with spatial effects is the one with ratio-dependent functional response. However, there is a need to further explore the effects of spatial motion on the dynamic behavior of population. In this work, we study a ratio-dependent predator-prey model with diffusion terms. The aim of this work is to investigate the changes in predator’s distribution in space as the prey populations change their mobility. We observe that the frequency diffusion of the prey gives rise (...) to the sparse density of the predator. Moreover, we also observe that the increasing rate of the conversion into predator biomass induces pattern transitions of the predator. Specifically speaking, Turing pattern of the predator populations goes gradually from a spotted pattern to a black-eye pattern, with the intermediate state being the mixture of spot and stripe pattern. The simulation results and analysis of this work illustrate that the diffusion rate and the real intrinsic factor influence the persistence of the predator-prey system mutually. (shrink)

Based on the power basis theory, this study examined the relationship between high-level talents’ perceived overqualification and withdrawal behavior and the mediating role of sense of power. We also analyze the boundary effects of protected values and being trusted. The hypotheses of this study were tested through questionnaires gathered across three phases over 3 months from 371 high-level talents from 6 enterprises, 5 governments, and 13 universities in China. Hierarchical regression analyses and bootstrapping appraisals showed that: POQ has a positive (...) relationship with withdrawal behavior; sense of power mediates the relationship between overqualification and withdrawal behavior, with high POQ resulting in low perceived power, which then reinforces withdrawal behavior; the negative relationship between POQ and sense of power is stronger for high-level talents with high protected value ; the negative relationship between sense of power and withdrawal behavior is stronger for high-level talents with highly being trusted ; moderated-mediation analyses reveal that the mediating effects of sense of power are stronger for employees with high protected values or being trusted. At the end of this study, the theoretical and practical implications are discussed. (shrink)

Spatial predator-prey models have been studied by researchers for many years, because the exact distributions of the population can be well illustrated via pattern formation. In this paper, amplitude equations of a spatial Holling–Tanner predator-prey model are studied via multiple scale analysis. First, by amplitude equations, we obtain the corresponding intervals in which different kinds of patterns will be onset. Additionally, we get the conclusion that pattern transitions of the predator are induced by the increasing rate of conversion into predator (...) biomass. Specifically, pattern transitions of the predator between distinct Turing pattern structures vary in an orderly manner: from spotted patterns to stripe patterns, and finally to black-eye patterns. Moreover, it is discovered that pattern transitions of prey can be induced by cross-diffusion; that is, patterns of prey transmit from spotted patterns to stripe patterns and finally to a mixture of spot and stripe patterns. Meanwhile, it is found that both effects of cross-diffusion and interaction between the prey and predator can lead to the complicated phenomenon of dynamics in the system of biology. (shrink)

本卷收入胡适哲学与文化方面的论文、函牍、讲演、札记80余篇。其中包括实验主义、我们对于西洋近代文明的态度等重要文章。所收文章全面反映了胡适哲学思想、学术主张和对于中西文化的态度,对于了解和研究胡适本人 以及现代中国学术史、现代中国启蒙运动等内容。.

本书分为神话与诉讼,历史与诉讼,故事与诉讼,制度法理,学术争鸣,法学教育,治学人生等八辑,收录了剧与诉的随想,正义之舞,游戏与诉讼,圣殿骑士的死亡密码,走向刑事宪法,法官权力之源与品格之治,法国法学教 育三题,关问于山水之间等文章.

人人都有一雙藝術家的眼睛。 「不論你曾崇仰何人何物，並以誰為師，最後你必須回到你自己本身。 藝術從未遠人，只是人遠離了他真正的自己。 在都市中，我們先失去了我們的眼睛，然後我們失去了一切。」－史作檉 本書為史作檉談論藝術美學文章集結，強調人人都有藝術家的眼睛，只在於人們失去了觀看的方式與純粹的初衷。 共分四大篇九章節，從藝術本質談起，援引賈克梅第、康丁斯基、蒙德里安、李德等藝術家創作，從繪畫、雕塑、音樂，旁述及顏氏篆書中的圖形特性，進臻至哲學美學、形上美學，淺明清晰，在一本書的閱讀時間裡就可在繁多 的藝術理論中找到自己的「眼睛」與觀看角度。.

胡適（1891-1962），安徽績溪人。原名嗣穈，後改名胡適，字適之，曾用筆名希彊、臧暉等。新文化運動的奠基人與領袖之一，倡導約翰・杜威的實用主義。1917年回國任教北大，參與編輯《新青年》《努力周報 》《獨立評論》等雜誌，先後擔任中華民國駐美大使、國立北京大學校長、台北「中央研究院」院長等職，著有《中國哲學史大綱》《嘗試集》《胡適文存》等書，並獲諾貝爾文學獎提名。.

al-Masāʼil al-qudsīyah -- Mutashābihāt al-Qurʼān -- Ajwibat al-masāʼil.

Conducting emotion analysis and generating users' feedback from social media platforms may help understand their emotional responses to video products, such as a documentary on the lockdown of Wuhan during COVID-19. The results of emotion analysis could be used to make further user recommendations for marketing purposes. In our study, we try to understand how users respond to a documentary through YouTube comments. We chose “The lockdown: One month in Wuhan” YouTube documentary, and applied emotion analysis as well as a (...) machine learning approach to the comments. We first cleaned the data and then introduced an emotion analysis based on the statistical characteristics and lexicon combination. After that, we applied the Latent Dirichlet Allocation topic modeling approach to further generate main topics with keywords from the comments and visualized the distribution by visualizing the topics. The result shows trust, joy, and anticipation are the most prominent emotions dominating the comments. The major three themes, which account for 70% of all comments, are discussing stories about fighting against the virus, medical workers being heroes, and medical workers being respected. Further discussion has been conducted on the changing of different sentiments over time for the ongoing health crisis. This study proves that emotion analysis and LDA topic modeling could be used to generate explanations of users' opinions and feelings about video products, which could support user recommendations in marketing. (shrink)

Ecological innovation is an inevitable trend for firms to enhance competitiveness and sustainably operate in the context of green economy. The previous literature has rarely discussed the influence of ambidextrous learning on the eco-innovation performance of startups and ignored the moderating effect of top management’s environmental awareness from the perspective of microscopic psychology. We have conducted a questionnaire survey on 212 firms established within 4 years in the Pearl River Delta of China, using the structure mode and the PROCESS by (...) Hayes (2013) to analyze the influence of ambidextrous learning, such as exploratory learning and exploitative learning, by startups on eco-innovation performance and verify the moderating effect of top management’s environmental awareness. The results show that: exploratory learning and exploitative learning have a positive and significant influence on eco-innovation performance, indicating that the organizational learning of startups is conducive to improving eco-innovation performance; under the moderating effect of top management’s environmental awareness, the influence of exploratory learning and exploitative learning on eco-innovation performance may differ. The results also show that in the process of organizing ambidextrous learning, startups should help raise the environmental awareness of top management to improve the eco-innovation performance, thus providing guidance for startups to carry out eco-innovation activities and for local governments to make decisions on green economy. (shrink)

Major construction projects have a great influence on the national economy and society, wherein cooperative relationship between construction suppliers plays an increasingly significant role in the overall supply chain system. However, the relationships between suppliers are noncontractual, multistage, dynamic, and complicated. To gain a deeper insight into the suppliers’ cooperative relationships, an evolutionary game model is developed to explore the cooperation tendency of multisuppliers. A replicator dynamic system is further formulated to investigate the evolutionary stable strategies of multisuppliers. Then, fourteen (...) “when-then” type scenarios are concluded and classified into six different evolutionary tracks. Meanwhile, the critical influencing factors are identified. The results show that the suppliers’ production capacity, owner-supplier contract, and the owner’s incentive mechanism influence the cooperation tendency of suppliers directly. The managerial implications contribute to insightful references for a more stable cooperative relationship between the owner and suppliers. (shrink)

This paper examines the effect of corporate social responsibility on the number of bond covenants. We find that a high CSR score has a negative association with the number of bond covenants. Moreover, our results are more pronounced for firms with a high bid-ask spread and high agency costs. Our analysis highlights the effect of the good stakeholder relationship on the bond contracts.

本书内容包括20世纪90年代以后的生态社会主义概述, 20世纪90年代以后的生态社会主义的新变化与动因, 20世纪90年代以后的生态社会主义的主要新观点——反思与批判, 生态社会主义的实践和启示等.

This article examines several aspects of the appreciation of Chinese calligraphy, seeking to address two questions. First, what are the aesthetic objects in its appreciation? And second, how can we characterize the process of coming to understand calligraphic works? The answers, I contend, can be found in classical texts on this art. I hold that the aesthetic objects in the experience of a calligraphic work are twofold: the outer form and the inner qualities. This is analogous to what Noël Carroll (...) understood as the object of aesthetic experience, that is, the formal and/or expressive properties.1 I propose that calligraphy appreciation can be understood as a process of retrieval, a term I take from Richard... (shrink)