Local Tax Incentives and Behavior of Foreign Enterprises: Evidence from a Large Developing Country

We analyze how profit reporting and investment behavior of foreign enterprises respond to local tax incentives in China, a large developing country. Using firm-level data between 2000 and 2013 from China’s industrial enterprise survey, we first provide strong evidence for tax competition among Chinese cities (especially cities within the same province) over the average effective income tax rate. We then find that, despite stringent capital controls, both reported pre-tax profits and investment of foreign firms respond strongly to local tax incentives, suggesting that subnational tax competition in China is oriented towards both mobile profits and real resources

SYNC+SYNC: Software Cache Write Covert Channels Exploiting Memory-disk Synchronization

Memory-disk synchronization is a critical technology for ensuring data correctness, integrity, and security, especially in systems that handle sensitive information like financial transactions and medical records. We propose SYNC+SYNC, a group of attacks that exploit the memory-disk synchronization primitives. SYNC+SYNC works by subtly varying the timing of synchronization on the write buffer, offering several advantages: 1) implemented purely in software, enabling deployment on any hardware devices; 2) resilient against existing cache partitioning and randomization techniques; 3) unaffected by prefetching techniques and cache replacement strategies. We present the principles of SYNC+SYNC through the implementation of two write covert channel protocols, using either a single file or page, and introduce three enhanced strategies that utilize multiple files and pages. The feasibility of these channels is demonstrated in both cross-process and cross-sandbox scenarios across diverse operating systems (OSes). Experimental results show that, the average rate can reach 2.036 Kb/s (with a peak rate of 14.762 Kb/s) and the error rate is 0% on Linux; when running on macOS, the average rate achieves 10.211 Kb/s (with a peak rate of 253.022 Kb/s) and the error rate is 0.004%. To the best of our knowledge, SYNC+SYNC is the first high-speed write covert channel for software cache.Comment: This manuscript was first submitted to the 33rd USENIX Security Symposium on June 6, 2023 (Summer Review Cycle

A comparative analysis of growth and nutritional quality of the hybrid grouper (Epinephelus fuscoguttatus ♀ × Epinephelus lanceolatus ♂) in a simulated pond system and a recirculating aquaculture system

Groupers, as a popular economic fish species, are now more frequently cultured in land-based facilities, however, traditional pond-farming methods are plagued by frequent disease outbreaks, unstable economic benefits, and environmental pollution. To explore a new farming mode for a grouper, an 80-day cultivation experiment was conducted using both a simulated pond system (SPS) and a recirculating aquaculture system (RAS). The research aims to evaluate the growth performance, health (pathogenic bacteria, intestinal microbiota), off-flavor compounds (geosmin, 2-methylisoborneol), and nutritional component (amino acids, fatty acid composition and content) of a hybrid grouper (Pinephelus fuscoguttatus ♀ × Epinephelus lanceolatus ♂) under different aquaculture systems. The results showed that the hybrid grouper in a RAS exhibited better growth performance; the concentration of Vibrio in the fish tissue in the RAS was significantly lower than that in the SPS. Moreover, the content of fresh amino acids in the RAS was significantly higher, and the levels of saturated fatty acids (SFAs) and ω-6 polyunsaturated fatty acids (ω-6PUFAs) were significantly higher in the RAS. This finding indicates the superior flavor and nutritional value of the grouper. These results prove that the RAS is suitable for the widespread cultivation of grouper

An unprecedented binodal (4,6)-connected Co(II) MOF as dual-responsive luminescent sensor for detection of acetylacetone and Hg2+ ions

A new Co(II) organic framework, {[Co2(L)(hfpd)(H2O)]·1.75H2O}n (1) (H4hfpd = 4,4′-(hexafluoroisopropylidene)diphthalic acid, L = 4,4′-bis(imidazol-1-yl)-biphenyl) was hydrothermally synthesized and characterized. 1 possesses an unusual (4,6)-connected layered network architecture. Fluorescence titration results present that 1 is rarely dual-responsive probe to detect acetylacetone and Hg2+ ions by luminescence quenching.publishe