No abstract

No abstract

Wudalianchi is a typical continental Cenozoic volcanic group rich in potassic volcanic rocks (Northeast China). Five hydrologically connected barrier lakes (Lakes 5 to 1) and upwelling cold mineral springs occur, forming a complex lake-groundwater system. Clarifying the water-source contributions and the role of water-rock interactions in the hydrological cycling for barrier lakes remains a challenge from scientific and engineering perspectives. In this study, seasonal variations of multiple isotopes were analyzed. δ18O and δD data indicate that the Wudalianchi lakes were mainly fed by mineral springs. The values, however, were greatly influenced by precipitation (rain and snow) and varying evaporation intensities. In contrast, 87Sr/86Sr ratios varied little between seasons (0.70701–0.7079), suggesting similar water-rock interactions through time. Nonetheless, Sr isotopic mixing models suggested that shallow mineral springs generally contributed >50% of the water to lower reaches. In contrast, the upstream wetland contributed >50% to Lake 5 and decreased down-valley (10.3–53.6%). Calculations based on the δ18O and δD Rayleigh fractionation equation suggest that evaporation in upper reaches were higher than the lower reaches. The evaporation in July were generally higher than in October. This study demonstrates the homogenous water-rock interactions and the associated water mixing effects on the terrestrial volcanic area.

With the development of The Times, the Internet industry has gradually penetrated all aspects of our daily life, especially in the field of pan-entertainment, among which the video industry is the gathering place of the Internet industry. Long video websites include iQiyi, Youku, and Tencent, while short video websites include Douyin and Kuaishou. Bilibili, an especially popular video website in recent years, has attracted many young people as its users. Bilibili, as a video website with both long and short videos, mainly focuses on PUGC content but also has rich self-made content. It has strong competition from many video websites, but it also successfully occupies a considerable part of the market with its unique content ecology and bullet screen culture. This paper will analyze the external and internal competition pattern of Bilibili, then analyze its differentiated competition strategy and competitive advantages, and finally put forward suggestions and prospects for its future development direction.