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| 2. |
- Li, Xiao Juan, et al.
(författare)
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Research progress of frost formation on microchannel heat exchangers
- 2017
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Ingår i: Xiandai Huagong/Modern Chemical Industry. - 0253-4320. ; 37:11, s. 47-52
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Forskningsöversikt (refereegranskat)abstract
- Focusing on the frost formation in microchannel heat exchangers, this paper analyzes the effects of frost formation on the thermal performance of microchannel heat exchangers, and summarizes the influence factors that cause the microchannel heat exchangers to form frost, including environmental factors and structure factors. The latest research progress in this issue at home and abroad is reviewed.
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| 3. |
- Lu, Xiaohua, et al.
(författare)
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Thermodynamic mechanism of complex fluids-solids interfacial interaction
- 2019
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Ingår i: Huagong Xuebao/CIESC Journal. - : Materials China. - 0438-1157. ; 70:10, s. 3677-3689
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Forskningsöversikt (refereegranskat)abstract
- Interfacial transfer at mesoscale is a common issue for all the multi-phase chemical processes, and the related study remains as a scientific challenge due to the complexities. Investigating the interfacial interactions at mesoscale to find out the regulation strategies is the key to realize process-intensification of mass-transfer and reaction for the advanced chemical industries. To accurately describe the behavior of fluids at the interface, a new molecular thermodynamic model that can describe the complex fluid-solid interface interaction. When the molecular thermodynamic modeling method is extended to the nano-micro interfacial transfer needs to be developed, calling for the coordination of advanced experiments at nano-micro scale and molecular with molocular thermodynamic modelling. Atomic force microscopy (AFM), which possess the sensitivity down to nanoscale, can directly obtain the interfacial interaction at nano-micro scale. The quantification of AFM-measured forces can be used to construct the coarse-grained molecular model and describe complex interfacial interaction. Then, the coarse-grained molecular model can reveal the molecular thermodynamic mechanism of nano- and micro- interface transfer, realizing quantitative prediction.
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| 4. |
- Ming, Yue, et al.
(författare)
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金属镁的氧化及氧化机理研究进展
- 2021
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Ingår i: Cailiao Daobao/Materials Reports. - 1005-023X. ; 35:19, s. 19134-19141
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Forskningsöversikt (refereegranskat)abstract
- As the lightest commercial metal structure material, magnesium alloy shows a wide application prospect in aerospace, automobile, 3C pro-ducts and other fields. At the same time, it is of great strategic significance to promote the application of magnesium alloy materials, in the face of the increasing shortage of iron and aluminum resources in the world and the dilemma of a large number of imported iron and aluminum ores. Compared with common steel and aluminum alloy, the research and development of magnesium alloy are not enough, and its application is also limited. The poor corrosion resistance of magnesium alloy is partly due to the high chemical activity of magnesium and the lack of protective effect of the film formed on the surface. Especially at high temperature, magnesium and its alloys are easy to oxidize, even burn, and release a lot of heat, which has become one of the bottlenecks limiting the extensive application of magnesium alloys. In recent years, a lot of researches have been carried out on the oxidation mechanism and influencing factors of magnesium and its alloys. It is considered that the oxidation of magnesium alloy is affected by factors, such as P-B value of oxide film, evaporation and diffusion of magnesium and so on. At present, the oxidation resistance of magnesium is improved by alloying. This provides theoretical support for the preparation of magnesium alloy with high oxidation resistance. At the same time, it expands the application prospect of magnesium alloy at high temperature, and will bring huge economic benefits to magnesium alloy industry. This paper summarizes the research progress of oxidation characteristics and mechanism of magnesium and its alloys at home and abroad. Firstly, the oxidation of magnesium is briefly introduced. Secondly, the mechanism and influencing factors of magnesium oxidation are analyzed, and the influence rules and mechanism of P-B value, diffusion, evaporation, microstructure and alloy elements on the oxidation behavior of magnesium are emphatically discussed. Finally, the shortcomings of the current research are summarized, and suggestions on the research direction of magnesium oxidation resistance are put forward.
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| 6. |
- Wang, Yafei, et al.
(författare)
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资源环境承载能力百年研究的系统综述
- 2023
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Ingår i: Dili Xuebao/Acta Geographica Sinica. - 0375-5444. ; 78:11, s. 2679-2693
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Forskningsöversikt (refereegranskat)abstract
- Carrying capacity, a concept entrenched in the natural resources and environmental field for nearly two centuries, has continually evolved to address the conflicts and sustainability of the human- nature relationship. This paper introduces an analytical framework for understanding carrying capacity within the context of the human- nature relationship. It systematically reviews the progression of international carrying capacity studies, analyzes global research trends, and compares these with Chinese studies, highlighting key research directions in China. Historically, carrying capacity traces its roots to (neo)Malthusian theories. Its evolution spans four distinct stages: resource carrying capacity (since the 1800s), environmental carrying capacity (since the 1970s), ecosystem carrying capacity (since the 1990s), and natural system carrying capacity (since the 2010s). The concept of carrying capacity varies widely across global disciplines and even within the same discipline, showcasing diverse applications. Carrying capacity has sparked controversy due to its connection to political economy theories and factors such as technological progress, market mechanisms, and spatial and temporal constraints. Therefore, it is imperative to engage in a restrained and explicit discussion and application of carrying capacity. Presently, China's carrying capacity studies align closely with the international community, capitalizing on regional-scale studies employing a holistic and systematic human-nature relationship approach. However, there is an opportunity for enhancement in terms of global-scale perspectives and the integration of natural and social sciences theories and methodologies. This paper proposes fostering innovation and application in carrying capacity research within the Chinese context. This entails integrating various disciplines and theories, exploring scale effects and mechanisms, utilizing model- data fusion and integration, applying case studies in various spatial units and typical zone types, and improving policy systems and institutions.
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| 7. |
- Xin, Yan-Bo, et al.
(författare)
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Research progress of hydrogen tunneling in two-dimensional materials
- 2017
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Ingår i: Wuli xuebao. - : CHINESE PHYSICAL SOC. - 1000-3290. ; 66:5
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Forskningsöversikt (refereegranskat)abstract
- One-atom-thick material such as graphene, graphene derivatives and graphene-like materials, usually has a dense network lattice structure and therefore dense distribution of electronic clouds in the atomic plane. This unique structure makes it have great significance in both basic research and practical applications. Studies have shown that molecules, atoms and ions are very difficult to permeate through these above-mentioned two-dimensional materials. Theoretical investigations demonstrate that even hydrogen, the smallest in atoms, is expected to take billions of years to penetrate through the dense electronic cloud of graphene. Therefore, it is generally considered that one-atom-thin materialis impermeable for hydrogen. However, recent experimental results have shown that the hydrogen atoms can tunnel through graphene and monolayer hexagonal boron nitride at room temperature. The existence of defects in one-atomthin material can also effectively reduce the barrier height of the hydrogen tunneling through graphene. Controversy exists about whether hydrogen particles such as atoms, ions or hydrogen molecules can tunnel through two-dimensional materials, and it has been one of the popular topics in the fields of two-dimensional materials. In this paper, the recent research progressof hydrogen tunneling through two-dimensional materials is reviewed. The characteristics of hydrogen isotopes tunneling through different two-dimensional materials are introduced. Barrier heights of hydrogen tunneling through different graphene and graphene-like materials are discussed and the difficulties in its transition are compared. Hydrogen cannot tunnel through the monolayer molybdenum disulfide, only a little small number of hydrogen atoms can tunnel hrough graphene and hexagonal boron nitride, while hydrogen is relatively easy to tunnel through silicene and phosphorene. The introduction of atomic defects or some oxygen-containing functional groups into the two-dimensional material is discussed, which can effectively reduce the barrier height of the hydrogen tunneling barrier. By adding the catalyst and adjusting the temperature and humidity of the tunneling environment, the hydrogen tunneling ability can be enhanced and the hydrogen particles tunneling through the two-dimensional material can be realized. Finally, the applications of hydrogen tunneling through two-dimensional materials in ion-separation membranes, fuel cells and hydrogen storage materials are summarized. The potential applications of hydrogen permeable functional thin film materials, lithium ion battery electrode materials and nano-channel ions in low energy transmission are prospected. The exact mechanism of hydrogen tunneling through two-dimensional material is yet to be unravelled. In order to promote these applications and to realize large-scale production and precision machining of these two-dimensional materials, an in-depth understanding of the fundamental questions of the hydrogen tunneling mechanism is needed. Further studies are needed to predict the tunneling process quantitatively and to understand the effects of catalyst and the influences of chemical environments.
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| 8. |
- Yu, Ji-Guo, et al.
(författare)
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Exercise training and Blood Volume
- 1995
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Ingår i: Journal of Shandong Physical Education Institute. - 1006-2076. ; 11:1, s. 31-35
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Forskningsöversikt (refereegranskat)abstract
- Both an acute sport and long-term exercise can result in changes in blood volume.Studying these changes, finding their changing patterns and knowing their effects on sport ability have been the problems of a lot of reserchers. In this review. previous works of other peoples were reviewed and analysed in order to provide a clue forfurther studies.
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| 9. |
- Yu, JiGuo, et al.
(författare)
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Mechanisms of Sport Anemia
- 1996
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Ingår i: Shandong Sports Science & Technology. - 1009-9840. ; 15:3, s. 45-47
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Forskningsöversikt (refereegranskat)abstract
- 运动员是贫血发生的高危人群，研究运动性贫血发生、发展的规律并采取相应的措施预防运动性贫血的发生一直是许多研究者所关心的问题。本文综述了国内外这方面的研究成果，从三个方面加以系统的论述，以期为进一步的研究提供有益的线索。
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| 10. |
- Zeng, Jinyan
(författare)
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女权主义与民主运动的民主化
- 2023
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Ingår i: China Journal of Democracy. ; 1:2, s. 198-212
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