Dalian University of Technology

About: Dalian University of Technology is a education organization based out in Dalian, China. It is known for research contribution in the topics: Catalysis & Finite element method. The organization has 60890 authors who have published 71921 publications receiving 1188356 citations. The organization is also known as: Dàlián Lǐgōng Dàxué.

Enhancement on a Skeletal Kinetic Model for Primary Reference Fuel Oxidation by Using a Semidecoupling Methodology

Abstract: A semidecoupling methodology for developing skeletal chemical kinetic models is presented and applied to con- struct an enhanced skeletal model for PRF (primary reference fuel) oxidation, which consists of 41 species and 124 reactions. The basic idea and the semidecoupling methodology are to consider the oxidation mechanism of alkane as two parts: a com- prehensive part to describe detailed reaction processes of C0−C1 radicals and molecules as the 'core' and a skeletal part that couples the 'core' to control the ignition characteristics. Accounting for the major weakness in the existing skeletal models for PRF oxidation, the enhancement on the new skeletal model mainly focuses on the laminar flame speed and important species evolution while maintaining the precise ignition delay prediction of the previous models. The new PRF skeletal model is validated against various experimental data including shock tube, jet-stirred reactor, flow reactor, premixed laminar flame speed, and internal combustion engines over a wide range of temperatures, pressures, and equivalence ratios. The results show good agree- ment with the experimental data, indicating that the semidecoupling methodology and the new skeletal model are promising for various reactors and engine applications incorporated with a multidimensional computational fluid dynamics (CFD) model.

Self-healing cement concrete composites for resilient infrastructures: A review

Abstract: Cracks in cement concrete composites, whether autogenous or loading-initiated, are almost inevitable and often difficult to detect and repair, posing a threat to safety and durability of concrete infrastructures, especially for those with strict sealing requirements. The sustainable development of infrastructures calls for the birth of self-healing concrete composites, which has the built-in ability to autonomously repair narrow cracks. This paper reviews the fabrication, characterization, mechanisms and performances of autogenous and autonomous healing concretes. Autogenous healing materials such as mineral admixtures, fibers, nanofillers and curing agents, as well as autonomous healing methods such as electrodeposition, shape memory alloys, capsules, vascular and microbial technologies, have been proven to be effective to partially or even fully repair small cracks. As a result, the mechanical properties and durability of concrete infrastructure can be restored to some extent. However, autonomous healing techniques have shown a better performance in healing cracks than most of autogenous healing methods that are limited to healing of cracks having a width narrower than 150 μm. Self-healing concrete with biomimetic features, such as self-healing concrete based on shape memory alloys, capsules, vascular networks or bacteria, is a frontier subject in the field of material science. Self-healing technology provides concrete infrastructures with the ability to adapt and respond to the environment, exhibiting a great potential to facilitate the creation of a wide variety of resilient materials and infrastructures.

A review of emerging trends in global PPP research: analysis and visualization

Abstract: The last decade has witnessed rapid development in the literature on public---private partnerships (PPPs); however, there have been few attempts to map the global research in this domain. To identify the state of the field and trends in PPP research, the CiteSpace software package was used in this study to conduct a series of content analyses and examine global patterns among publications, including the distribution of core authors and institutions; high-frequency categories and keywords; journal and author contributions; highly cited papers and hot topics of research; and trends with regard to co-author analysis, co-word analysis, co-citation analysis, and particularly cluster analysis. We present all research focuses in a scientometric way and arrive at the following findings. First, the most significant developments and progress in PPP research have occurred primarily in China, the US, the UK and Australia. Second, the existing studies in the field of PPP research focus primarily on Engineering, Business and Economics, and Public Administration. Third, the emerging trends in PPP research have shifted away from concession pricing and concession periods, PPP legislation, procurement management, critical success factors, value for money and PPP project governance toward risk allocation, performance evaluation, renegotiation of concession contracts, real option evaluation and contract management, which are likely to define the new research frontier in the field of PPP research.