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In the context of the digital information era, the impact of "The Internet Plus," "Big Data," and other technologies on urban social development has been far beyond any preceding era, under the influence of information technology, urban agglomeration space exhibits a new layout. Based on the search engine data of eleven cities in the Guangdong-Hong Kong-Macao Greater Bay Area from 2012 to 2021, this research constructs the inter-city information network strength linkage matrix to examine the evolution characteristics of city network structure and its driving causes. The results reveal that (1) the overall information linkage strength exhibits a pattern of steadily growing the radiating effect from the leading cities of Guangdong, Shenzhen, and Hong Kong to the surrounding cities, and a closer and more balanced information linkage network is gradually built. (2) Guangzhou-Shenzhen-Hong Kong-Guangdong-Hong Kong-Macao Greater Bay Area information linkage absolute control advantage, four cities Foshan, Dongguan, Zhuhai, Macao regional hub position steadily highlighted. The entire information connection network of the urban agglomerations tends to be flat and polycentric at the same time. (3) The regional core-edge hierarchy is well established, with the four cities of Guangzhou, Dongguan, Shenzhen, and Hong Kong creating a northwest-southeast orientation. The core metropolis regions of Guangdong, Hong Kong, and Macao in the Greater Bay Area increasingly exert a radiation spreading effect to the northeast and southwest. (4) The urban economy, transportation distance, and information infrastructure have substantial effects on the information connection intensity network of urban clusters. [ABSTRACT FROM AUTHOR]

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The precious metal iridium was recovered from titanium anode deplating by oxidation precipitation, reduction dissolution and other processes. The experiment determined the best process conditions. When the red-ox potential is greater than 900 mV, the amount of ammonium chloride is more than 1 times of iridium, the precipitation rate of iridium is greater than 98%, and the reduction pH value is 3, a small amount of platinum, palladium, rhodium and ruthenium impurities in iridium can be separated well. The method is suitable for the treatment of iridium waste with iridium as the main body and the content of precious metal impurities reduced. The operation is simple and the purity of the product can meet the requirements of the national standard. [ABSTRACT FROM AUTHOR]