This study presents a corpus-based analysis of the use of wh sentences by language learners, in language textbooks and in authentic written discourse. It focuses on the polysemeous nature of wh words, which can be used as interrogatives, declaratives and to introduce subordinate clauses. The analysis of wh sentences in EFL textbooks showed that there are more prototypical examples at low proficiency levels. When teaching the interrogative, textbooks focus almost exclusively on grammatical ...

Uranium isotopes (238U/235U) have emerged as a proxy to reconstruct the redox conditions of the Earth's oceans and atmosphere based upon the large isotopic fractionation between reduced U(IV) and oxidized U(VI). Variations in 238U/235U, particularly when recorded in carbonate sediments, can track global trends in marine oxygenation and de-oxygenation. It is unique from other proxies because reduction primarily occurs at the sediment-water interface, and this sensitivity makes U isotopes es...

This book analyzes in detail the technological evolution process of databases in the era of cloud computing and explains how traditional database technology has gradually developed to cloud-native form from multiple perspectives such as architecture design, implementation mechanism, and system optimization. This book emphasizes the full combination of theory and practice and also analyzes the SQL optimization and execution, transaction processing, caching and indexing principles of databas...

Energiewende, Mobilitätswende, Kohleausstieg: Klimawandel und CO2-Emissionen werden in Deutschland heftiger diskutiert denn je – auch mit Blick auf Globalität und internationale Zusammenarbeit. Der vorliegende Sammelband gewährt originären Einblick in die in China dazu stattfindende Debatte. Grundlage ist dabei das chinesische Forschungsprojekt Analyse der Pfade der Treibhausgasemissionen wichtiger Staaten und Chinas, Scheitelpunktforschung und Kosten-Nutzen-Analyse von Emissionsminderung....

This book reviews the state-of-the-art in combinatorial testing, with particular emphasis on the automatic generation of test data. It describes the most commonly used approaches in this area - including algebraic construction, greedy methods, evolutionary computation, constraint solving and optimization - and explains major algorithms with examples. In addition, the book lists a number of test generation tools, as well as benchmarks and applications. Addressing a multidisciplinary topic, ...

The 2024 IAIN World Congress, held from October 28th – 30th, at the Beijing International Convention Center, brought together over 350 participants and 31 delegates from all over the world to discuss cutting-edge advancements in navigation and maritime technology.Organized by the International Association of Institutes of Navigation (IAIN) and hosted by the China Institute of Navigation (CIN), the Congress delved into the latest technological trends, research, and industry developm...