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A survey of geothermal power generation combined with renewable energy for low carbon emissions

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CLEAN ENERGY 2024年第3期8卷 138-146页

作者： Liu, Xuyang Cai, Dongsheng Ukwuoma, Chiagoziem C. Huang, Qi Bamisile, Olusola Chengdu univ technol Coll Nucl Technol & Automat Engn Chengdu Sichuan Peoples R China southwest univ sci & technol Elect Engn Dept Maiyang Sichuan Peoples R China

At present, industrial development is heavily dependent on traditional fossil energy, which has had an increasingly serious impact on the environment. Clean and renewable energy has received extensive attention and its proportion in daily life has gradually increased. As a clean and renewable energy source that is not affected by changes in weather and seasons, geothermal energy has developed rapidly in recent years and has received increasing attention. According to reports, the total installed capacity of geothermal power generation in the world in 2020 was 15 950 MW-an increase of similar to 27% over 2015. At the end of 2019, the total installed capacity for global geothermal direct use was 107 727 MW-an increase of 52.0% compared with 2015; the total annual energy use was 1 020 887 TJ (283 580 GWh)-an increase of 72.3% over 2015. Through the investigation of geothermal power generation technology in recent years, the characteristics and shortcomings of various power generation methods are analysed. At the same time, this review analyzes the characteristics of geothermal energy and other renewable-energy (solar energy, water energy) coupling power generation, and analyzes the principles and characteristics of geothermal energy and various new-energy coupling power generation methods. Through investigation and analysis, this review provides a complete understanding of various geothermal power generation technologies and provides insights into the future development direction. [GRAPHICS] .

关键词： geothermal power generation solar energy water energy combined power generation ABANDONED OIL COMBINED SYSTEM GAS-WELLS HEAT RESOURCES DRIVEN

Microfluidic preparation of surfactant-free ultrafine DAAF with tunable particle size for insensitive initiator explosives

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DEFENCE technolOGY 2024年第9期39卷 42-52页

作者： Yang, Bo Li, Rui Cao, Wei He, Si-min Zhu, Jincan Wu, Qi Ding, Heng Chen, Jin Wang, Weimiao Qiao, Zhiqiang Li, Xiaodong Yang, Guangcheng China Acad Engn Phys Inst Chem Mat Mianyang 621900 Peoples R China Nanjing univ sci & technol Sch Chem Engn Nanjing 210094 Peoples R China southwest univ sci & technol Mianyang 621010 Peoples R China

High purity and ultrafine DAAF (u-DAAF) is an emerging insensitive charge in initiators. Although there are many ways to obtain u-DAAF, developing a preparation method with stable operation, accurate control, good quality consistency, equipment miniaturization, and minimum manpower is an inevitable requirement to adapt to the current social technology development trend. Here reported is the microfluidic preparation of u-DAAF with tunable particle size by a passive swirling microreactor. Under the guidance of recrystallization growth kinetics and mixing behavior of fluids in the swirling microreactor, the key parameters (liquid flow rate, explosive concentration and crystallization temperature) were screened and optimized through screening experiments. Under the condition that no surfactant is added and only experimental parameters are controlled, the particle size of recrystallized DAAF can be adjusted from 98 nm to 785 nm, and the corresponding specific surface area is 8.45 m(2)g(-1) to 1.33 m(2)g(-1). In addition, the preparation method has good batch stability, high yield (90.8%-92.6%) and high purity (99.0%-99.4%), indicating a high practical application potential. Electric explosion derived flyer initiation tests demonstrate that the u-DAAF shows an initiation sensitivity much lower than that of the raw DAAF, and comparable to that of the refined DAAF by conventional spraying crystallization method. This study provides an efficient method to fabricate u-DAAF with narrow particle size distribution and high reproducibility as well as a theoretical reference for fabrication of other ultrafine explosives. (c) 2024 China Ordnance Society. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://***/ licenses/by-nc-nd/4.0/).

关键词： Microfluidic preparation Screening crystallization conditions Narrow particle size distribution Low initiation sensitivity Ultrafine DAAF ASSISTED PRECIPITATION ENERGETIC MATERIALS SOL-GEL SIMULATION PLATFORM CL-20 HNS

Photosynthetic co-culture system of algae and human umbilical vein endothelial cells: The effect on alleviating hypoxia and hypoxia/reoxygenation injury

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BIOSURFACE AND BIOTRIBOLOGY 2024年第2期10卷 76-88页

作者： Lin, Donghu Chen, Yuanyuan Tao, Xinyu Che, Xin Li, Shiyu Cheng, Shiyu Qu, Shuxin southwest Jiaotong univ Inst Biomed Engn Coll Med Chengdu Sichuan Peoples R China southwest Jiaotong univ Sch Mat Sci & Engn Key Lab Adv Technol Mat Minist Educ Chengdu Sichuan Peoples R China southwest Jiaotong univ Inst Biomed Engn Coll Med Chengdu 610031 Sichuan Peoples R China southwest Jiaotong univ Sch Life Sci & Engn Chengdu Sichuan Peoples R China

It is a developed photosynthetic co-culture system to alleviate the hypoxia and hypoxia/reoxygenation (H/R)-injured human umbilical vein endothelial cells (HUVECs). The algae, Chlorella vulgaris, were encapsulated to slow their growth while not affecting the photosynthetic oxygen-producing capacity by Layer-by-layer (LbL) using gelatin and sodium alginate as the positive and negative charges materials, respectively. Then, the photosynthetic co-culture system of HUVECs and self-oxygenating alginate hydrogel (Algae-gel) was constructed in which the optimal ratios between algae and HUVECs were 5:1 and 20:1 for a 2D or 3D co-cultured manner, respectively. It indicated that the 3D co-cultured manner of HUVECs needed more O2 by the production of algae than it did in a 2D co-cultured manner. The co-cultured Algae-gel could alleviate hypoxia and the oxidative stress injury of hypoxia and hypoxia/reoxygenation (H/R)-treated HUVECs in the proliferation, intracellular ROS and cellular migratory ability. In addition, the Algae-gel could downregulate the expression of hypoxia-inducible factors 1 alpha (HIF-1 alpha) and vascular endothelial growth factor (VEGF) of hypoxia and H/R-injured HUVECs due to the improvement of hypoxia and H/R injury. This photosynthetic co-culture system could offer a promising approach for repairing hypoxia and H/R-injured cells or tissue by providing safe and stable O2.

关键词： biomaterials biomedical application bionic design regenerative medicine self-assembly tissue engineering OXYGEN BIOMATERIALS PHYSIOLOGY

Biofunctionalisation strategies of material surface and the inspired biological effects for bone repair

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BIOSURFACE AND BIOTRIBOLOGY 2024年第2期10卷 17-41页

作者： Duan, Guowen Chang, Dongbiao Zhang, Chengdong Li, Siyu Liu, Xinyao Wang, Zian Chen, Long Li, Jinsheng Bai, Zhenfan Weng, Jie southwest Jiaotong univ Sch Life & Engn Chengdu Peoples R China southwest Jiaotong univ Sch Mat Sci & Engn Key Lab Adv Technol Mat Minist Educ Chengdu Peoples R China southwest Jiaotong univ Inst Biomed Engn Coll Med Chengdu Peoples R China

Due to trauma and disease, bone defects endanger the healthy life of human beings. At present, the gold standard for bone defect repair is still autologous bone transplantation and allogeneic bone transplantation. However, its insufficient source, potential disease transmission and immune rejection limit its clinical application. Therefore, the development of bone repair materials plays an important role in promoting bone repair. As the interface between material and tissue, the surface of the material plays an important role in the reaction after implantation, which determines the effectiveness of defect repair treatment. With the development of surface engineering and technology, bone repair materials have developed from biological inertia to biological activity by endowing various biological functions by controlling the composition, topological morphology and structure of the material surface etc. The inspired biofunctionalisation of material surface includes the capacities of inducing osteogenesis, promoting angiogenesis, antibacterial, immune regulation etc., as well as integration of postoperative repair and treatment. The authors review the biofunctionalisation of biomaterial surface and the inspired biological effects for bone repair, mainly including physical and chemical properties of material surface to regulate osteogenesis, and functional strategy of bone repair material surface.

关键词： bioactivity biomaterials biosurface bone MESENCHYMAL STEM-CELLS IN-VITRO DRUG-DELIVERY OSTEOGENIC DIFFERENTIATION HYDROXYAPATITE COATINGS IMMUNE MICROENVIRONMENT CONTROLLED-RELEASE TITANIUM IMPLANT SCAFFOLDS ANTIBACTERIAL

Research of simulation and experiment on arc characteristics of gas mechanical switch

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HIGH VOLTAGE 2024年第3期9卷 626-635页

作者： Jiang, Cheng Qu, Lu Yu, Zhangqing Gan, Zhizheng Yan, Xin Zeng, Rong Huang, Yulong Li, Shaofu Tsinghua univ Dept Elect Engn Beijing Peoples R China southwest univ sci & technol Sch Informat Engn Mianyang Peoples R China Tsinghua univ Sichuan Energy Internet Res Inst Chengdu Peoples R China

An arc is the high-temperature discharge plasma produced in the opening process of mechanical switches, which directly affects the breaking capability of a hybrid DC circuit breaker. According to the physical mechanism of an electric arc, the construction of an arc model for simulation analysis is an important technical means in the electrical field. In this study, based on the theory of magneto hydrodynamics (MHD), a gas mechanical switch model of a natural commutation DC circuit breaker with a compound gap is established. The arc motion process under different conditions is simulated and calculated. The influence of different initial pressures, different opening speeds, and different striking currents on the arc voltage characteristics is analysed. The results show that the larger the gas pressure, the smaller the arc volume and the higher the arc voltage. The faster the opening speed, the longer the arc and the higher the arc voltage; with the increase of the current, the arc voltage increases rapidly at a low current, while the arc voltage increases slowly at a high current.

关键词： CIRCUIT-BREAKER COEFFICIENTS

Hybrid HMX multi-level assembled under the constraint of 2D materials with efficiently reduced sensitivity and optimized thermal stability

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DEFENCE technolOGY 2024年第9期39卷 123-132页

作者： Song, Xiaomin Huang, Longjin Peng, Rufang Huang, Qi Xu, Jinjiang Sun, Jie China Acad Engn Phys Inst Chem Mat Mianyang 621900 Peoples R China southwest univ sci & technol Sch Mat Sci & Engn State Key Lab Environm Friendly Energy Mat Mianyang 621010 Peoples R China

The interfacial interaction between HMX molecules and coating materials is the key to the safety performance of explosives and has received extensive attention. However, screening suitable coating agents to enhance the interfacial effect to obtain high-energy and low-sensitivity explosives has long been a major challenge. In this work, HMX-PEI/rGO/g-C3N4 (HPrGC) composites were innovatively prepared by a multi-level coating strategy of two-dimensional graphite rGO and g-C3N4. The g-C3N4 used for desensitization has a rich pi-conjugated system and shows outstanding ability in reducing friction sensitivity. The hierarchical structure of HPrGC formed by electrostatic self-assembly and pi-pi stacking can effectively dissipate energy accumulation under heat and mechanical stimulation through structural evolution, thus exhibiting a prominent synergistic desensitization effect on HMX. The results show that rGO/g-C3N4 coating has no effect on the crystal structure and chemical structure of HMX. More importantly, the perfect combination of g-C3N4 and rGO endows HPrGC with enhanced thermal stability and ideal mechanical sensitivity (IS: 21 J, FS: 216 N). Obviously, the new fabrication of HPrGC enriches the variety of desensitizer materials and helps to deepen the understanding of the interaction between explosives and coatings. (c) 2024 China Ordnance Society. Publishing services by Elsevier B.V. on behalf of KeAi CommunicationsCo. Ltd. This is an open access article under the CC BY-NC-ND license

关键词： HMX-PEI/rGO/g-C 3 N 4 Electrostatic self-assembly p stacking Synergistic desensitization GRAPHENE OXIDE CRYSTALS NANOCOMPOSITES COMPOSITES DENSITY IMPACT

Enhancing the biological functionality of poly (lactic-co-glycolic acid) cage-like structures through surface modification with micro- and nano-sized hydroxyapatite particles

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BIOSURFACE AND BIOTRIBOLOGY 2024年第2期10卷 63-75页

作者： Chang, Dongbiao Li, Siyu Bai, Zhenfan You, Jing Cao, Lili Li, Qingcao Tan, Huan Zheng, Yan Ye, Feilun Weng, Jie southwest Jiaotong univ Inst Biomed Engn Coll Med Chengdu Peoples R China southwest Jiaotong univ Sch Mat Sci & Engn Key Lab Adv Technol Mat Minist Educ Chengdu Peoples R China southwest Jiaotong univ Chengdu Peoples Hosp 3 Med Cosmetol Dept Affiliated Hosp Chengdu Peoples R China

Biomaterials with exceptional performance are crucial for addressing the challenges of complex bone regeneration. Compared with traditional three-dimensional scaffolds, injectable microspheres enable new strategies for the treatment of irregular bone defects. Biodegradable poly (lactic-co-glycolic acid) has found widespread applications as microcarriers of drugs, proteins, and other active macromolecules. Applied to the surface of poly (lactic-co-glycolic acid) cage-like structures (PLGA-CAS), hydroxyapatite (HA) effectively reduces inflammation while enhancing biological effects. In this study, we loaded the surface of PLGA-CAS with micro- and nano-hydroxyapatite particles, referred to as mu HA/PLGA-CAS and nHA/PLGA-CAS, respectively. Subsequently, their material characteristics and biological effects were assessed. The incorporation of hydroxyapatite onto PLGA-CAS resulted in enhanced surface roughness and hydrophilicity, coupled with improved thermal stability and delayed degradation. Furthermore, mu HA/PLGA-CAS induced osteogenic differentiation of osteoblast precursor cells, while nHA/PLGA-CAS improved endothelial cell adhesion and stimulated angiogenic differentiation in vitro. Collectively, these findings suggest that mu HA/PLGA-CAS and nHA/PLGA-CAS, each with distinct characteristics, hold significant potential for application as microcarriers in various biomedical contexts.

关键词： biological functions hydroxyapatite material characteristics surface modification BONE MICROSPHERES REPAIR ANGIOGENESIS OSTEOGENESIS INHIBITION SCAFFOLDS HYDROGELS

Paleo-uplift forced regional sedimentary evolution: A case study of the Late Triassic in the southeastern Sichuan Basin, South China

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PETROLEUM 2024年第3期10卷 462-473页

作者： He, Fangyu Cheng, Qingsong Zhang, Dongtao Ji, Yubing Wang, Ziying Lu, Tenghui PetroChina Zhejiang Oilfield Co Hangzhou 310023 Peoples R China southwest Petr univ Sch Geosci & Technol Chengdu 610500 Peoples R China southwest Petr univ Sichuan Nat Gas Geol Key Lab Chengdu 610500 Peoples R China

The sedimentary environment of the Upper Triassic in the southeastern Sichuan Basin is obviously controlled by Luzhou paleo-uplift (LPU). However, the influence of paleo-uplift on the sedimentary patterns of the initial stages of this period in the southeastern Sichuan Basin has not yet been clear, which has plagued oil and gas exploration and development. This study shows that there is a marine sedimentary sequence, which is considered to be the first member of Xujiahe Formation (T3X1) in the southeastern Sichuan Basin. The development of LPU resulted in the sedimentary differences between the eastern and western Sichuan Basin recording T3X1 and controlled the regional sedimentary pattern. The western part is dominated by marine sediments, but the eastern paleo-uplift area is dominated by continental sedimentation in the early stage of T3X1, and it begins to transform into a marine sedimentary environment consistent with the whole basin in the late stage of the period recorded by the Xujiahe Formation. The evidences are as follows: (1) time series: based on the cyclostratigraphy analysis of Xindianzi section and Well D2, in the southeastern Sichuan Basin, the period of sedimentation of the Xujiahe Formation is about 5.9 Ma, which is basically consistent with the Qilixia section, eastern Sichuan basin, where the Xujiahe Formation is widely considered to be relatively complete; (2) distribution and evolution of palaeobiology: based on analysis of abundance evolution of major spore-pollen, many land plant fossils are preserved in the lower part of T3X1, indicates the sedimentary environment of continental facies. In the upper part of T3X1, the fossil of terrestrial plants decreased, while the fossil of marine and tidal environment appeared, this means that it was affected by the sea water in the late stages of T3X1; (3) geochemistry: calculate the salinity of water from element indicates that the uplift area is continental sedimentary environment in the early stage of

关键词： Luzhou paleo-uplift Late Triassic Cyclostratigraphy Palynology Sedimentary environment POLARITY TIME-SCALE XUJIAHE FORMATION NEWARK SUPERGROUP NORTH-AMERICA PALEOCLIMATE XUANHAN RECORD APTS

Protein hydrogels for biomedical applications

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BIOSURFACE AND BIOTRIBOLOGY 2024年第3期10卷 106-131页

作者： Wang, Xinyi Hou, Yue Lu, Xiong Xie, Chaoming Jiang, Yanan southwest Jiaotong univ Coll Med Inst Biomed Engn Chengdu Sichuan Peoples R China southwest Jiaotong univ Sch Mat Sci & Engn Minist Educ Key Lab Adv Technol Mat Chengdu Sichuan Peoples R China southwest Jiaotong univ Peoples Hosp Chengdu 3 Obes & Metab Med Engn Integrat Lab Dept Gen SurgAffiliated Hosp Chengdu Sichuan Peoples R China

Hydrogels, characterised as highly hydrophilic three-dimensional polymer networks, have gained increasing attention due to their unique physicochemical properties, finding applications in various fields. Natural polymer hydrogels exhibit higher biocompatibility and biodegradability compared to traditional synthetic polymer hydrogels. Proteins, being the principal materials of natural polymer hydrogels, bear numerous modifiable functional groups. The resultant hydrogel possesses responsiveness, adjustable degradability, and underway as an excellent biomaterial. Seven common raw materials used to construct protein hydrogels are introduced. In terms of comparing natural polymer hydrogels with traditional synthetic polymer hydrogels, the authors conduct a detailed analysis and comparison, highlighting the advantages of natural polymer hydrogels in terms of biocompatibility and biodegradability, and summarising their characteristics. The authors also address the limitations of various protein hydrogels and list existing strengthening cross-linking strategies, proposing new insights to overcome the application limits of protein hydrogels. Additionally, the applications of protein hydrogels in drug delivery, biosensing, bio-inks and tissue engineering are discussed. The authors conclude by summarising the current challenges faced by protein hydrogels and prospecting its future development.

关键词： biomaterials biomedical application HUMAN HAIR KERATIN CROSS-LINKING SILK-FIBROIN EXTRACELLULAR VESICLES ARTICULAR-CARTILAGE COLLAGEN STRUCTURE ALGINATE HYDROGEL DRUG-DELIVERY STEM-CELLS SOY