The temperature (T) and entropy (S) fields of baryonic gas, or intergalactic medium (IGM), in the ACDM cosmology are analyzed using simulation samples produced by a hybrid cosmological hydrodynamic/N-body code based on the weighted essentially non-oscillatory scheme. We demonstrate that, in the nonlinear regime, the dynamical similarity between the IGM and dark matter will be broken in the presence of strong shocks in the IGM. The heating and entropy production by the shocks breaks the IGM into multiple phases. The multiphase and non-Gaussianity of the IGM field would be helpful to account for the high-temperature and high-entropy gas observed in groups and clusters with low-temperature IGM observed by Lyα forest lines and the intermittency observed by the spikes of quasi-stellar object's absorption spectrum.

It is now a well established fact that galaxies undergo significant morphological transformation during their lifetimes, manifesting as an evolution along the Hubble sequence from the late to the early Hubble types. The physical processes commonly believed to be responsible for this observed evolution trend, i.e. the major and minor mergers, as well as gas accretion under a barred potential, though demonstrated applicability to selected types of galaxies, on the whole have failed to reproduce the most important statistical and internal properties of galaxies. The secular evolution mechanism reviewed in this paper has the potential to overcome most of the known difficulties of the existing theories to provide a natural and coherent explanation of the properties of present day as well as high-redshift galaxies.

The Chinese ancient accounts of timing observations of 48 lunar eclipses and the secular variation of the Earth's spin speed are discussed. A series of ΔT expressing the secular deceleration of the Earth's rotation was obtained. The average increase rate of length of the day is about 1.5 milliseconds per century.

The purpose of this thesis paper is to explore the selection of quality cost management dimension indicators, the mechanism of quality cost management on enterprise performance, the size of the impact of each component of quality cost management on enterprise performance, in order to improve the quality management cost management theory. On this basis to minimise the loss cost and achieve optimal enterprise performance. The paper analyses the impact of quality cost management on enterprise performance by designing questionnaires, collecting data through surveys and using statistical methods. The relevant theories of quality cost management and enterprise performance is compared, and the correlation between qualities cost management and enterprise performance is explored by means of a questionnaire. This paper also explores the extent to which each component of quality cost management affects firm performance, which in turn enriches the relevant theories of quality cost management. The results of this study indicate that quality cost management has an important impact on enterprise performance, and that recognising the relationship between quality cost management and enterprise performance, identifying scientific management methods, and continuously improving quality cost management are important means of enhancing enterprise competitiveness. It is expected that it can provide some references for enterprises to carry out quality cost management effectively.

Cross-cultural adaptation is a social behavior that occurs when individuals enter a foreign cultural environment. Cross-cultural adapters learn the moral norms, language customs, and other aspects of the host culture, gradually adapting to and accepting it. They integrate their inherent beliefs, thoughts, emotions, and behavioral patterns with the host culture, forming a diverse multicultural background. Since humans have engaged in cross-geographical interactions, cross-cultural adaptation has existed worldwide. With the development of science and technology and the advent of global economic integration, the world has become a global village. Nowadays, more and more people travel far from their hometowns to study, work, and engage in activities in foreign countries. Cross-cultural encounters bring novelty, mystery, and a sense of pressure, as living in a different culture means making specific changes in lifestyle and thought patterns. This change can be stressful, and not everyone can overcome it to adapt to life in a foreign country successfully. Therefore, cross-cultural adaptation is one of the most essential areas in today’s cross-cultural education. This study explores the internal and external factors that affect the cross-cultural adaptation of international students in South Korea and proposes relevant strategies to improve their cross-cultural adaptation.

Under the background of economic globalization, the trade between countries in the world is increasing rapidly. Under the rules of WTO, the tariff rate of trade barriers is decreasing, but on the other hand, nontariff barriers are increasing. especially Compared with tariff barriers, green trade barriers have a greater impact on agricultural trade. Therefore, the negative impact of green trade barriers on agricultural products trade is a problem worthy of attention and urgent response in the future agricultural products trade between China and South Korea. Firstly, this paper analyzes the meaning and characteristics of green trade barriers, introduces the current situation of agricultural products trade between China and South China, analyzes the influence of Korean trade barriers on’s agricultural products export trade, and on this basis, forms countermeasures to promote Chinese agricultural products export to South Korea. The research of this paper has certain guiding significance for promoting Chinese agricultural export trade to South Korea.