38 results on '"Zhen Shang"'
Search Results
2. Improved Fatigue Life of Slm-Produced Tc4 Alloy Treated by Pulsed Magnetic Field
- Author
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HU, Zhen-shang, primary
- Published
- 2023
- Full Text
- View/download PDF
3. Effect of Pulsed Magnetic Field Treatment on Microstructure and Fatigue Life of Tc4 Alloy Fabricated by Slm
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HU, Zhen-shang, primary, Xue, Ling, additional, Zhang, Xinzhou, additional, Yang, Yi, additional, Lu, Dong, additional, Liu, Yongsheng, additional, and Wu, Mingxia, additional
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- 2023
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- View/download PDF
4. Effect of Pulsed Magnetic Field Treatment on Microstructure and Fatigue Life of Tc4 Alloy Fabricated by Slm
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Zhen-shang HU, Ling Xue, Xinzhou Zhang, Yi Yang, Dong Lu, Yongsheng Liu, and Mingxia Wu
- Published
- 2023
5. Experimental Study on Heat Transfer and Anti-Corrosion Performance of an Aln Porous Ceramic Skeleton with Controllable Preparation
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Huan Wang, Ziyuan Li, Zhen Shang, Limei Tian, Shuai Zhang, and Yuying Yan
- Published
- 2023
6. Improved Fatigue Life of Slm-Produced Tc4 Alloy Treated by Pulsed Magnetic Field
- Author
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Zhen-shang HU
- Subjects
History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2023
7. A novel non-keyhole friction stir welding process
- Author
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Zhen Shang, Shude Ji, Peng Gong, Ying-Ying Zuo, and De-Jun Yan
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Materials science ,Strategy and Management ,Ultimate tensile strength ,Base (geometry) ,Fracture (geology) ,Friction stir welding ,Management Science and Operations Research ,Composite material ,Joint (geology) ,Keyhole ,Industrial and Manufacturing Engineering ,Clamping ,Material flow - Abstract
Keyhole is a defect which seriously restrains the industrial application of friction stir welding (FSW) technique. In this study, a new technique of non-keyhole friction stir welding (N-KFSW) was proposed, which could eliminate the keyhole during the in-situ welding process. Experiments were performed using a 6 mm thick 6061-T6 aluminum alloy plate under different rotating velocities. Due to the unexpected consumption of rotating sleeve during N-KFSW, the N-KFSW tool was simplified to a system consisting of a hollow sleeve and a clamping ring based on the working principle of N-KFSW. Compared with the solid sleeve, this hollow sleeve promoted the material flow below the sleeve. Therefore, the depth of the sleeve-stirring zone (SSZ) was equal to the thickness of the plate when the plunging depth was only 4.2 mm. The SSZ was divided into the sleeve directly affected zone (SDAZ) and the sleeve indirectly affected zone (SIAZ). The material in the SIAZ was transferred by the indirectly stirring effect of hollow sleeve, so the butt interface in the SIAZ was distributed as the S-shape line at the bottom of the SIAZ. The maximum tensile strength of 217.3 MPa was obtained at 1200 rpm, which was 71.5% of that of the base material. The height of the S-shape line shrunk with the rotating velocity increasing, and then governed that the fracture position of the joint transferred to the HAZ from the SSZ. The fracture surface morphology exhibited typical ductile fracture.
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- 2022
8. Controlled carbothermic reduction for enhanced recovery of metals from spent lithium-ion batteries
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Wenhao Yu, Yingchao Zhang, Jiehui Hu, Jiahui Zhou, Zhen Shang, Xia Zhou, and Shengming Xu
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Economics and Econometrics ,Waste Management and Disposal - Published
- 2023
9. Microwave-assisted separation hemicellulose from hemp stalk: Extracting performance, extracting mechanism and mass transfer model
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Xinliang Zhu, Yingchao Wang, Kai Li, Liangliang An, Zhen Shang, Qian Yang, Jianquan Hu, Yuxin Liu, and Sheng Chen
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Agronomy and Crop Science - Published
- 2023
10. Experiment investigation on effects of elastic modulus on cavitation erosion of silicone rubber
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Yangjun Wang, Ziyuan Li, Limei Tian, and Zhen Shang
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Inorganic Chemistry ,Acoustics and Ultrasonics ,Organic Chemistry ,Chemical Engineering (miscellaneous) ,Environmental Chemistry ,Radiology, Nuclear Medicine and imaging - Published
- 2023
11. Multi-wave tabu search for the boolean quadratic programming problem with generalized upper bound constraints
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Zhen Shang, Jin-Kao Hao, Songzheng Zhao, Yang Wang, and Fei Ma
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General Computer Science ,Modeling and Simulation ,Management Science and Operations Research - Published
- 2023
12. Healing Cracks on the Surface of Porous Ceramics Skeleton by Impregnation and Secondary Sintering
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Huan Wang, Ziyuan Li, Zhen Shang, Shuai Zhang, Yuying Yan, and Limei Tian
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History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
13. Improvement of Tensile Property of Slm-Produced Tc4 Alloy after Treatment of Electro-Pulsing
- Author
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Zhen-shang HU and Cheng-zhi Liao
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History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
14. Improvement of Tensile Property of Slm-Produced Tc4 Alloy after Treatment of Electro-Pulsing
- Author
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HU, Zhen-shang, primary and Liao, Cheng-zhi, additional
- Published
- 2022
- Full Text
- View/download PDF
15. Houttuynia-derived nitrogen-doped hierarchically porous carbon for high-performance supercapacitor
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Liqin Liu, Xingye An, Qingliang Xu, Hongbin Liu, Zhen Shang, Yu Xin Liu, Hao Zhang, Mengxia Shen, Haibing Cao, Fiona Baker, Yonghao Ni, and Jian Yang
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Supercapacitor ,Materials science ,Nanostructure ,biology ,Carbonization ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,biology.organism_classification ,01 natural sciences ,Capacitance ,0104 chemical sciences ,chemistry ,Chemical engineering ,Specific surface area ,General Materials Science ,Houttuynia ,0210 nano-technology ,Porosity ,Carbon - Abstract
Three-dimensional (3D) heteroatom-doped nanostructured carbon materials have gained extensive attention because of their tremendous potential for enhancing supercapacitor performance. Herein, based on a mild carbonization/activation process we successfully developed green/sustainable 3D hierarchically porous nitrogen-doped nanostructure carbon (N–HNC) materials from houttuynia biomass, showing high specific capacitance and high cyclic stability. The as-prepared houttuynia-derived porous carbon material shows a unique flower-like architecture with well-distributed micro/meso pores and a high specific surface area of 2090 m2/g. The assembled supercapacitor based on N–HNC sample shows superior specific capacitance (473.5 F/g at 1 A/g) and remains over 50% of specific capacitance at 20 A/g. The N–HNC based symmetric supercapacitor, constructed with a two-electrode configuration, shows an energy density of 15.99 Wh/kg at 500 W/kg and outstanding capacitance retention of 95.74% even after 10,000 charge-discharge cycles at 10 A/g in an aqueous 6 M KOH electrolyte system. The results highlight the potential of the 3D porous N-doped hierarchical nano-structural carbon materials from houttuynia biomass as candidate electrodes for supercapacitor applications. This study provides an example of using the inherent framework structure of biomass as a precursor to synthesize hierarchically porous nitrogen-doped nanostructure for high-performance supercapacitor applications.
- Published
- 2020
16. Numerical study on effects of hydrogen direct injection on hydrogen mixture distribution, combustion and emissions of a gasoline/hydrogen SI engine under lean burn condition
- Author
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Xiumin Yu, Zhen Shang, Wei Dong, Guanting Li, Zezhou Guo, Yinan Li, Zhe Zhao, and Decheng Li
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Materials science ,Hydrogen ,Renewable Energy, Sustainability and the Environment ,Analytical chemistry ,Energy Engineering and Power Technology ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Combustion ,01 natural sciences ,0104 chemical sciences ,law.invention ,Cylinder (engine) ,Fuel Technology ,chemistry ,law ,Hydrogen fuel enhancement ,Gasoline ,0210 nano-technology ,Spark plug ,NOx ,Lean burn - Abstract
A numerical study on effects of hydrogen direct injection on hydrogen mixture distribution, combustion and emissions was presented for a gasoline/hydrogen SI engine. Under lean burn conditions, five different direct hydrogen injection timings were applied at low speeds and low loads on SI engines with direct hydrogen injection (HDI) and gasoline port injection. The results were showed as following: firstly, with the increase of hydrogen direct injection timing, the hydrogen concentration near the sparking plug first increases and then decreases, reaching the highest when hydrogen direct injection timing is 120°CA BTDC: Secondly, hydrogen can speed up the combustion rate. The main factor affecting the combustion rate and efficiency is the hydrogen concentration near the sparking plug: Thirdly, in comparing with gasoline, the NOX emissions with hydrogen addition increase by an average of 115%. For different hydrogen direct injection timings, the NOX emissions of 120°CA BTDC is the highest, which is 29.9% higher than the 75°CA BTDC. The hydrogen addition make the NOX emissions increase in two ways. On the one hand, the average temperature with hydrogen addition is higher. On the other hand, the temperature with hydrogen addition is not homogeneous, which makes the peak of temperature much higher. In a word, the main factor of NOX emissions is the size of high temperature zone in the cylinder: Finally, because the combustion is more complete, in comparing with gasoline, hydrogen addition can reduce the CO and HC emissions by 32.2% and 80.4% respectively. Since a more homogeneous hydrogen mixture distribution can influence a lager zone in the cylinder and reduce the wall quenching distance, these emissions decrease with the increase of hydrogen direct injection timing. The CO and HC emissions of 135°CA BTDC decrease by 41.5% and 71.4%, respectively, compared to 75°CA BTDC.
- Published
- 2020
17. Lignin-containing cellulose nanocrystals/sodium alginate beads as highly effective adsorbents for cationic organic dyes
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Mingshuai Ma, Zhen Shang, Lanfeng Hui, Pengtao Liu, Xinliang Liu, Yonghao Ni, Lin Dai, Zhong Liu, and Shaoyu Yuan
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Alginates ,Biomass ,02 engineering and technology ,Lignin ,Biochemistry ,Calcium Chloride ,03 medical and health sciences ,chemistry.chemical_compound ,Adsorption ,Structural Biology ,Cations ,Organic Chemicals ,Cellulose ,Coloring Agents ,Molecular Biology ,030304 developmental biology ,Sodium alginate ,0303 health sciences ,Chemistry ,Cationic polymerization ,Reproducibility of Results ,Hydrogels ,General Medicine ,Hydrogen-Ion Concentration ,021001 nanoscience & nanotechnology ,Methylene Blue ,Kinetics ,Cellulose nanocrystals ,Sulfonate ,Chemical engineering ,Nanoparticles ,Thermodynamics ,0210 nano-technology ,Methylene blue - Abstract
Cellulose nanocrystals (CNCs) is an exciting class of sustainable and carbohydrate material, which has great potential applications in molecular adsorption. However, the complex preparation process and limited adsorption capacity of CNCs hinder its commercial application. In this study, we design a novel functional cellulose nanocrystals-based adsorbent by an ingenious mixing of lignin-containing cellulose nanocrystals (LCNCs), sodium alginate (SA), and calcium chloride solution. Benefiting from the sulfonate groups of lignin, carboxyl groups of SA, the maximum adsorptive capability of LCNCs/SA beads for methylene blue was found to be 1181 mg g−1, which was significantly higher than previously reported biomass-based adsorbents. More importantly, LCNCs/SA beads can be reused several times. This strategy can not only improve the adsorption performance of CNCs-based materials, but also simplify the production technology of CNCs, which greatly promote the commercial application of CNCs materials.
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- 2019
18. A comparative study on effects of homogeneous or stratified hydrogen on combustion and emissions of a gasoline/hydrogen SI engine
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Zezhou Guo, Qingxu Shen, Yaodong Du, Yinan Li, Zhen Shang, Decheng Li, Xiumin Yu, He Fengshuo, and Guanting Li
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Thermal efficiency ,Materials science ,Hydrogen ,Renewable Energy, Sustainability and the Environment ,Analytical chemistry ,Energy Engineering and Power Technology ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Combustion ,01 natural sciences ,0104 chemical sciences ,law.invention ,Ignition system ,Fuel Technology ,chemistry ,law ,Gasoline ,0210 nano-technology ,Spark plug ,NOx ,Lean burn - Abstract
A comparative study on effects of homogeneous or stratified hydrogen on combustion and emissions was presented for a gasoline/hydrogen SI engine. Three kinds of injection modes (gasoline, gasoline plus homogeneous hydrogen and gasoline plus stratified hydrogen) and five excess air ratios were applied at low speed and low load on a dual fuel SI engine with hydrogen direct injection (HDI) and gasoline port injection. The results showed that, with the increase of excess air ratio, the brake thermal efficiency increases firstly then decreases and reaches the highest when the excess air ratio is 1.1. In comparison with pure gasoline, hydrogen addition can make the ignition stable and speed up combustion rate to improve the brake thermal efficiency especially under lean burn condition. Furthermore, it can reduce the CO and HC emissions because of more complete combustion, but produce more NOX emissions due to the higher combustion temperature. Since, in the gasoline plus stratified hydrogen mode, the hydrogen concentration near the sparking plug is denser than that of homogeneous hydrogen, the ignition is more stable and faster, which further speed up the combustion rate and improve the brake thermal efficiency. In the gasoline plus stratified hydrogen mode, the brake thermal efficiency increases by 0.55%, the flame development duration decreases by 1.0°CA, rapid combustion duration decreases by 1.3°CA and the coefficient of variation (COV) decreases by 9.8% on average than that of homogeneous hydrogen. However, in the gasoline plus stratified hydrogen mode, due to the denser hydrogen concentration near the sparking plug and leaner hydrogen concentration near the wall, the combustion temperature and the wall quenching distance increase, which make the NOX and HC emissions increase by 14.3% and 12.8% on average than that of homogeneous hydrogen.
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- 2019
19. Biomass derived carbonaceous materials with tailored superstructures designed for advanced supercapacitor electrodes
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Liqin Liu, Xingye An, Zhongjian Tian, Guihua Yang, Shuangxi Nie, Zhen Shang, Haibing Cao, Zhengbai Cheng, Shujun Wang, Hongbin Liu, and Yonghao Ni
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Agronomy and Crop Science - Published
- 2022
20. SLC39A6/ZIP6 is essential for zinc homeostasis and T-cell development in zebrafish
- Author
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Zhen Shang, Yi Yang, Jianfeng Zhou, Lijun Jiang, Tongjuan Li, Gaoxiang Wang, Dan Li, Lei Zhao, Jue Wang, and Jiaqi Tan
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0301 basic medicine ,T-Lymphocytes ,T cell ,Lymphocyte ,Mutant ,Biophysics ,Apoptosis ,Biochemistry ,03 medical and health sciences ,0302 clinical medicine ,Immune system ,medicine ,Animals ,Homeostasis ,Cation Transport Proteins ,Molecular Biology ,Zebrafish ,Cells, Cultured ,biology ,Gene Expression Regulation, Developmental ,Cell Biology ,T lymphocyte ,Zebrafish Proteins ,biology.organism_classification ,Cell biology ,Zinc ,030104 developmental biology ,medicine.anatomical_structure ,030220 oncology & carcinogenesis ,Gene Deletion ,Intracellular - Abstract
Zinc (Zn) is an essential trace element that modulate innate and acquired immune responses, and its deficiency triggers lymphopenia. However, the precise mechanisms underlying zinc-mediated lymphocyte maintenance have not been well clarified. Here, we have successfully generated a zip6-null mutant zebrafish line using TALENs. The Zip6-null mutant zebrafish developed normally during gastrulation. Loss of zip6 in zebrafish resulted in significant T lymphocyte reduction and a decrease in intracellular Zn levels. And the zip6 deficiency increases caspase-related cell apoptosis in both zebrafish cells and human T cells. Our results suggest that ZIP6 plays a critical part in T cell development, and enhance our understanding of Zn homeostasis and immune system maintenance.
- Published
- 2019
21. Along-arc variations in isotope and trace element compositions of Paleogene gabbroic rocks in the Gangdese batholith, southern Tibet
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Jiahao Gao, Li-E Gao, Zhen Shang, Ya-Fei Wang, Lingsen Zeng, and Linghao Zhao
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010504 meteorology & atmospheric sciences ,Subduction ,Continental crust ,Geochemistry ,Trace element ,Geology ,010502 geochemistry & geophysics ,01 natural sciences ,Mantle (geology) ,Geochemistry and Petrology ,Lithosphere ,Batholith ,Mafic ,Paleogene ,0105 earth and related environmental sciences - Abstract
Gabbroic rocks in continental arcs constrain the composition of sub-arc mantle and the roles played by mafic magmas in the generation and differentiation of continental crust. Here, we report whole-rock elemental and isotope (Sr and Nd) compositions of ~50 Ma and ~30 Ma gabbroic rocks from the central and eastern Gangdese (CG and EG) batholith, southern Tibet. A key observation is the along-arc isotopic and geochemical variations of ~50 Ma gabbros and dykes: EG rock samples show enriched Sr Nd isotope compositions, with initial 87Sr/86Sr = 0.7053–0.7077 and eNd(t) = −4.3 to +1.1 (average −3.0), and have higher abundance of heavy rare-earth elements (HREEs), high field strength elements, and melt-mobile elements compared with CG samples, which yield initial 87Sr/86Sr = 0.7038–0.7043 and eNd(t) = +3.4 to +6.9. Geochemical evidence suggests that the Sr Nd isotope differences reflect those in the mantle sources and are not due to crustal interactions, indicating that the sub-Gangdese batholithic mantle exhibited different degrees of enrichment at least ~50 Myr ago. These observations, combined with previous data, suggest that the sub-Gangdese batholithic mantle exhibited along-arc segmentation at 92°E–93°E at 50 Ma. This segmentation occurred probably between 90 and 47 Ma and was a result of the different characteristics and variable additions of the enriching agents into the asthenospheric mantle. CG gabbroic rocks were derived from depleted asthenospheric mantle enriched by variable amounts of aqueous fluids from the Neo-Tethyan slab, whereas EG rocks were generated from asthenospheric mantle enriched by hydrous melts from Indian continental crust. This interpretation implies that Indian continental crust was subducted beneath the southern Lhasa subterrane prior to 47 Ma. Compared with ~50 Ma rocks, EG ~30 Ma dykes exhibit higher melt-mobile element abundance and stronger REE fractionations, and were generated from deeper, melt-enriched mantle, signifying that a lithospheric thickening event occurred between 50 and 30 Ma in the EG batholith.
- Published
- 2019
22. A review on comprehensive recycling of spent power lithium-ion battery in China
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Wenhao Yu, Yi Guo, Zhen Shang, Yingchao Zhang, and Shengming Xu
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Automotive Engineering ,Energy Engineering and Power Technology ,Transportation ,Electrical and Electronic Engineering - Published
- 2022
23. Study on combustion and emissions of a hydrous ethanol/gasoline dual fuel engine with combined injection
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Yinan Li, Zhen Shang, Xiumin Yu, Yaodong Du, Decheng Li, Zhe Zhao, and Mingjia Xu
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Thermal efficiency ,Ethanol ,Chemistry ,General Chemical Engineering ,Organic Chemistry ,Analytical chemistry ,Energy Engineering and Power Technology ,Combustion ,law.invention ,chemistry.chemical_compound ,Fuel Technology ,Anhydrous ethanol ,law ,Ethanol fuel ,Gasoline ,Inlet manifold ,NOx - Abstract
Hydrous ethanol has lower cost and energy consumption during the production process than anhydrous ethanol. Many researchers used hydrous ethanol instead of anhydrous ethanol to manufacture hydrous ethanol-gasoline. The water ratio in hydrous ethanol (ω) determines the energy consumption in the production process of ethanol. However, no one researched the effects of different ω on combustion and emissions of hydrous ethanol-gasoline. So, we prepared five kinds of ethanol with different ω (0, 5%, 10%, 15%, 20% vol.) to research the effects of ω on combustion and emissions. This study adopted combined injection with hydrous ethanol direct injection plus gasoline port injection (HEDI + GPI). The engine speed was 1500 rpm, and λ was 1, the intake manifold absolute pressure was 48 kPa, the direct injection ratio was 20%, five spark timings varied from 5 °CA BTDC to 25 °CA BTDC. The results showed hydrous ethanol prolonged flame development and propagation duration, decreased Tmax and Pmax, delayed APmax. Water increased COVimep, but using hydrous ethanol at the reasonable spark timing would not significantly affect the stability. Meanwhile, when the spark timing was MBT, compared with GE (gasoline/anhydrous ethanol dual fuel) fuel, as ω in GEW (gasoline/hydrous ethanol dual fuel) fuels increased, torque and brake thermal efficiency improved by 1.69%, 1.13%, −0.01%, −0.77%; HC increased by 2.13%, 9.02%, 23.89%, 37.15%; CO decreased by 41.95%, 28.56%, 5.59%, 2.46%; NOx decreased by 10.10%, −0.75%, −0.17%, 4.18%; total PN emissions decreased by 24.07%, 69.57%, 36.34%, 32.45%. Meanwhile, more water caused the size of particles to drop, made particles smaller.
- Published
- 2022
24. Acetaminophen-induced liver injury is attenuated in transgenic fat-1 mice endogenously synthesizing long-chain n-3 fatty acids
- Author
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Ruibing Feng, Chunyan Yan, Huanxing Su, Jing X. Kang, Hang Zhang, Chang-Zhen Shang, Jian-Bo Wan, Yang Wang, and Conghui Liu
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Fatty Acid Desaturases ,0301 basic medicine ,Mice, Transgenic ,Inflammation ,Pharmacology ,medicine.disease_cause ,Biochemistry ,Mice ,03 medical and health sciences ,Liver disease ,Fatty Acids, Omega-3 ,Animals ,Medicine ,ASK1 ,Caenorhabditis elegans Proteins ,Acetaminophen ,chemistry.chemical_classification ,Liver injury ,030102 biochemistry & molecular biology ,business.industry ,digestive, oral, and skin physiology ,Analgesics, Non-Narcotic ,medicine.disease ,Mice, Inbred C57BL ,030104 developmental biology ,chemistry ,Apoptosis ,Female ,Chemical and Drug Induced Liver Injury ,medicine.symptom ,business ,Oxidative stress ,Polyunsaturated fatty acid ,medicine.drug - Abstract
Acetaminophen (APAP) overdose-induced hepatotoxicity is the most commonly cause of drug-induced liver failure characterized by oxidative stress, mitochondrial dysfunction, and cell damage. Therapeutic efficacy of omega-3 polyunsaturated fatty acids (n-3 PUFA) in several models of liver disease is well documented. However, the impacts of n-3 PUFA on APAP hepatotoxicity are not adequately addressed. In this study, the fat-1 transgenic mice that synthesize endogenous n-3 PUFA and wild type (WT) littermates were injected intraperitoneally with APAP at the dose of 400 mg/kg to induce liver injury, and euthanized at 0 h, 2 h, 4 h and 6 h post APAP injection for sampling. APAP overdose caused severe liver injury in WT mice as indicated by serum parameters, histopathological changes and hepatocyte apoptosis, which were remarkably ameliorated in fat-1 mice. These protective effects of n-3 PUFA were associated with regulation of the prolonged JNK activation via inhibition of apoptosis signal-regulating kinase 1 (ASK1)/mitogen-activated protein kinase kinase 4 (MKK4) pathway. Additionally, the augment of endogenous n-3 PUFA reduced nuclear factor kappa B (NF-κB) – mediated inflammation response induced by APAP treatment in the liver. These findings indicate that n-3 PUFA has potent protective effects against APAP-induced acute liver injury, suggesting that n-3 dietary supplement with n-3 PUFA may be a potential therapeutic strategy for the treatment of hepatotoxicity induced by APAP overdose.
- Published
- 2018
25. Contrasting Sr Nd Hf isotope systematics in Early Jurassic magmatic rocks from the Lhasa terrane: Implications for the lithospheric architecture of the Lhasa terrane
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Jiahao Gao, Chunli Guo, Zhen Shang, Lingsen Zeng, Xuxuan Ma, Linghao Zhao, Hai-tao Wang, Li-E Gao, and Kejun Hou
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Radiogenic nuclide ,Fractional crystallization (geology) ,010504 meteorology & atmospheric sciences ,Gabbro ,Pluton ,Geochemistry ,Geology ,engineering.material ,010502 geochemistry & geophysics ,01 natural sciences ,Mantle (geology) ,Geochemistry and Petrology ,engineering ,Mafic ,0105 earth and related environmental sciences ,Hornblende ,Terrane - Abstract
Early Jurassic plutonic rocks from the Central Lhasa block that range from gabbro to granite yield similar 206Pb/238U ages ranging from 187.6 Ma to 196.0 Ma. Gabbros and diorites are characterized by similar radiogenic 87Sr/86Sr(t) ratios that range from 0.7053 to 0.7060, unradiogenic eNd(t) values ranging from −4.2 to −2.5 and eHf(t) values ranging from −8.8 to −2.8. Compared with the intermediate to mafic rocks, the granites have much higher 87Sr/86Sr(t) ratios, from 0.7102 to 0.7127, and lower eNd(t) values, from −8.7 to −7.5, and eHf(t) values from −11.9 to −7.5. Elemental and isotopic data suggest that the gabbros were derived from a melt-modified subarc mantle, diorites represent derivatives produced by hornblende fractional crystallization of gabbros, and granites were generated by the melting of ancient crustal basement rocks. Combined with literature data, these results suggest that the Central Lhasa block, as well as parts of the Southern and Northern Lhasa blocks, also contains ancient crystalline basement rocks.
- Published
- 2021
26. Oligocene crustal anatexis in the Tethyan Himalaya, southern Tibet
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Kejun Hou, Zhen Shang, Li-E Gao, Qian Wang, Lingsen Zeng, and Jiahao Gao
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Dike ,geography ,Fractional crystallization (geology) ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Partial melting ,Trace element ,Geochemistry ,Geology ,010502 geochemistry & geophysics ,Anatexis ,01 natural sciences ,Leucogranite ,Geochemistry and Petrology ,Petrology ,0105 earth and related environmental sciences ,Gneiss - Abstract
Recent studies in the Xiaru and Malashan gneiss dome of the Tethyan Himalaya, southern Tibet identify that Xiaru and Paiku tourmaline-bearing leucogranite dike formed at ~ 28–29 Ma. Together with ~ 28 Ma Kuday garnet-bearing leucogranites, it is demonstrated that the Himalayan orogenic belt experienced a major episode of crustal melting in the Mid-Oligocene. Geochemical data indicate that three suites of leucogranite are characterized by large variations in the major and trace element compositions as well as Sr–Nd isotope systematics, which could be explained by combined fractional crystallization and relative contributions of micas and accessory phases dissolved into a crustal melt during decompressional melting of metapelitic rocks. Documentation of Oligocene partial melting of crustal rocks could indicate that the exhumation of deep crustal rocks in the Himalayan orogenic belt could have started as early as Oligocene.
- Published
- 2016
27. Dialdehyde modified cellulose nanofibers enhanced the physical properties of decorative paper impregnated by aldehyde-free adhesive
- Author
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Hongyun Qiu, Zhen Shang, Ling Long, Xiaoyan Li, Ru Liu, Jianfeng Xu, and Yonghao Ni
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chemistry.chemical_classification ,Materials science ,Polymers and Plastics ,Sodium periodate ,Abrasion (mechanical) ,Organic Chemistry ,Formaldehyde ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Fiberboard ,01 natural sciences ,Aldehyde ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Nanofiber ,visual_art ,Emulsion ,Materials Chemistry ,visual_art.visual_art_medium ,Adhesive ,Composite material ,0210 nano-technology - Abstract
Impregnated decorative paper was an important wood-based panel finishing material. However, traditional impregnated decorative paper was impregnated with melamine-formaldehyde resin, which will release formaldehyde and harm the human health. To solve this problem, small molecule polyacrylate-polyethylene glycol (PEG) adhesive was used to achieve the non-formaldehyde addition of the impregnation system. The dialdehyde modified CNF (D-CNF), modified by sodium periodate (NaIO4), and triethylenediamine were introduced to enhance the surface properties of the impregnated decorative paper. The results showed that the incorporation of D-CNF and triethylenediamine imparted excellent physical strength and surface properties to impregnated decorative paper. When the dosage of 0.3 wt% D-CNF and 3 mL/100 g triethylenediamine in the compound emulsion, the hardness, abrasion resistant value and surface bonding strength of impregnated decorative paper adhered fiberboard reached 3H, 330 r of damage and 1.13 MPa, respectively. Thus, it could be effectively used for making high-performance formaldehyde-free impregnated decorative paper.
- Published
- 2020
28. Comparative study on effects of injection mode on combustion and emission characteristics of a combined injection n-butanol/gasoline SI engine with hydrogen direct injection
- Author
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Decheng Li, Zhen Shang, Guanting Li, Xiumin Yu, Lei Ren, Guowu Wei, and Yinan Li
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Materials science ,Hydrogen ,020209 energy ,Mechanical Engineering ,Butanol ,Mode (statistics) ,Analytical chemistry ,chemistry.chemical_element ,02 engineering and technology ,Building and Construction ,Combustion ,Pollution ,Industrial and Manufacturing Engineering ,chemistry.chemical_compound ,General Energy ,020401 chemical engineering ,Volume (thermodynamics) ,chemistry ,n-Butanol ,0202 electrical engineering, electronic engineering, information engineering ,0204 chemical engineering ,Electrical and Electronic Engineering ,Gasoline ,NOx ,Civil and Structural Engineering - Abstract
In this paper, on the basis of combined injection technique, three injection modes with five n-butanol/gasoline volume ratios ( ν N ) were put forward, aiming to compare and evaluate the relationship between the injection mode and the combustion and emission characteristics of an n-butanol/gasoline SI engine equipped with an extra hydrogen direct injection system. The results indicated that under low load condition, compared with NGP (n-butanol/gasoline port injection) mode, the NGPD (n-butanol/gasoline combined injection) mode and NGPH (n-butanol/gasoline with hydrogen combined injection) mode can both improve the combustion performance. The peak cylinder pressure of NGPD and NGPH mode was 5.58% and 11.63% higher than that of NGP mode on average, respectively. Furthermore, the combined injection modes concentrated the process of heat release, shortened the combustion duration, increased the power performance and improved the combustion stability at all ν N . As for emissions, the NGPD and NGPH combined modes significantly decreased the HC and CO emissions, but increased the NOX emissions. Among all the test conditions, the NGPH mode with 25% ν N obtained the best combustion quality. Additionally, the effect rules of ν N on combustion and emission characteristics under NGP mode were found to be consistent with those under NGPD and NGPH combined modes.
- Published
- 2020
29. Guided-wave second harmonics in Nd:YCOB ridge waveguides produced by combination of carbon ion irradiation and precise diamond blade dicing
- Author
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Shengqiang Zhou, Rang Li, Weijie Nie, Qingming Lu, Feng Chen, Shavkat Akhmadaliev, Zhen Shang, and Chen Cheng
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Materials science ,02 engineering and technology ,01 natural sciences ,Waveguide (optics) ,010309 optics ,Inorganic Chemistry ,chemistry.chemical_compound ,Planar ,Optics ,0103 physical sciences ,YCOB crystal [Nd] ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Spectroscopy ,Guided wave testing ,business.industry ,Organic Chemistry ,Diamond blade ,Second-harmonic generation ,Second harmonic generation ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Optical waveguides ,chemistry ,Harmonics ,Wafer dicing ,0210 nano-technology ,business ,Nd:YCOB - Abstract
We report on the fabrication of Nd:YCa4O(BO3)3 (Nd:YCOB) ridge waveguides by combining carbon ion irradiation and precise diamond blade dicing. The guiding and spectroscopic properties of the planar as well as ridge waveguides are investigated. The second harmonic generation (SHG) at 532 nm has been realized through the waveguide structures. With nearly the same input power, the maximum average output powers are 0.56 mW and 0.62 mW, and the maximum conversion efficiencies reach 0.3%W−1 and 0.5%W−1, for planar and ridge waveguides, respectively.
- Published
- 2016
30. Study on effects of split injection proportion on hydrogen mixture distribution, combustion and emissions of a gasoline/hydrogen SI engine with split hydrogen direct injection under lean burn condition
- Author
-
Zhe Zhao, Zhen Shang, Decheng Li, Guanting Li, Yinan Li, Xiumin Yu, and Zhaohui Jin
- Subjects
Materials science ,Hydrogen ,020209 energy ,General Chemical Engineering ,Organic Chemistry ,Analytical chemistry ,Energy Engineering and Power Technology ,chemistry.chemical_element ,02 engineering and technology ,Combustion ,Cylinder pressure ,law.invention ,Fuel Technology ,020401 chemical engineering ,chemistry ,law ,0202 electrical engineering, electronic engineering, information engineering ,Mixture distribution ,0204 chemical engineering ,Gasoline ,Spark plug ,Lean burn ,NOx - Abstract
Split hydrogen direct injection is proved to be a better way to use the hydrogen in the engine. Therefore, a numerical study on effects of split injection proportion on hydrogen mixture distribution, combustion and emissions was presented of a gasoline/hydrogen SI engine with split hydrogen direct injection to investigate the principle of split hydrogen direct injection. Under lean burn condition, six different split injection proportions achieve six kinds of hydrogen mixture distribution, which affect the engine performance a lot. With split hydrogen direct injection, the mixture nearby the spark plug is denser and in other zone is more homogeneous at the same time, which achieve better performances of both efficiency and emissions. As the first injection proportion increases, the cylinder pressure climbs to the highest with first injection proportion of 33% and the NOX, CO and HC emissions decrease continually. When the first injection proportion is 75%, the NOX, CO and HC emissions are respectively 31.6%, 79.3% and 40.6% less than those of single hydrogen direct injection.
- Published
- 2020
31. Research on the combustion and emissions of an SI engine with acetone-butanol-ethanol (ABE) port injection plus gasoline direct injection
- Author
-
Zhen Shang, Ping Sun, Xiumin Yu, Tianqi Wang, Zhe Zhao, Decheng Li, Weibo Shi, Wei Dong, Yaodong Du, and Zezhou Guo
- Subjects
Thermal efficiency ,Materials science ,Particle number ,020209 energy ,General Chemical Engineering ,Butanol ,Organic Chemistry ,Analytical chemistry ,Energy Engineering and Power Technology ,02 engineering and technology ,Combustion ,law.invention ,Ignition system ,chemistry.chemical_compound ,Fuel Technology ,020401 chemical engineering ,chemistry ,Mean effective pressure ,Biofuel ,law ,0202 electrical engineering, electronic engineering, information engineering ,0204 chemical engineering ,Gasoline direct injection - Abstract
Recently, more attention has been paid to the application of biobutanol in spark ignition (SI) engines due to its superior properties among the biofuels. However, the high energy consumption and low efficiency of recovering biobutanol from ABE solution during the fermentation process lead to the high price of biobutanol, which limits its popularization in vehicles. Using ABE directly can solve the problem of high price of bio-butanol. This research explored the performance of an SI engine with ABE port injection (ABEPI) plus gasoline direct injection (GDI) at different excess air ratio (λ = 0.9, 1.0, 1.1, 1.2) and ABE port injection ratio (ABEPIr = 0, 25%, 50%, 75%, 100%). The results show that CA10-90 declines with increasing ABEPIr. CA0-10 and CA0-90 decrease with ABEPIr increasing at λ = 0.9, and first descend and then rise at λ = 1.0, 1.1 and 1.2. The coefficient of variations of IMEP (CoVIMEP) reaches the minimum value at ABEPIr = 75%. As ABEPIr increases, the peak in-cylinder pressure (Pmax), indicated mean effective pressure (IMEP) and brake thermal efficiency (BTE) increase at λ = 0.9 while first increase and then decrease at λ = 1.0, 1.1 and 1.2, reaching the maximum values at ABEPIr = 75%. Hydrocarbon (HC) reaches the minimum value at ABEPIr = 50%. Particle number decreases dramatically as ABEPIr increases from 0% to 50% and remains at an extremely low level when ABEPIr is greater than 50%. In summary, ABE is suitable for SI engine as an alternative fuel and fuels with high ABE ratio (≥50%) can effectively improve the combustion and particle emissions by ABEPI + GDI combined injection.
- Published
- 2020
32. Numerical research on effect of hydrogen blending fractions on idling performance of an n-butanol ignition engine with hydrogen direct injection
- Author
-
Shan Huang, Zhen Shang, Guanting Li, Xiumin Yu, He Fengshuo, Zezhou Guo, and Weibo Shi
- Subjects
Materials science ,Hydrogen ,020209 energy ,General Chemical Engineering ,Organic Chemistry ,Analytical chemistry ,Acetaldehyde ,Formaldehyde ,Energy Engineering and Power Technology ,chemistry.chemical_element ,02 engineering and technology ,Combustion ,Cylinder (engine) ,law.invention ,Ignition system ,chemistry.chemical_compound ,Fuel Technology ,020401 chemical engineering ,chemistry ,law ,n-Butanol ,0202 electrical engineering, electronic engineering, information engineering ,0204 chemical engineering ,Spark plug - Abstract
In this paper, a numerical research on an n-butanol ignition engine with hydrogen direct injection was carried out, aiming to observe the effect of hydrogen blending fractions on idling performance. A three-dimensional dynamic mesh model coupled with a detailed chemical kinetic mechanism of n-butanol oxidation were established to investigate the engine combustion process in CFD software CONVERGE. And the numerical model was validated through experiments. The performance of pressure and temperature inside cylinder, HC and CO emissions and formaldehyde and acetaldehyde emissions with four hydrogen fractions were simulated and analyzed. The simulation results showed that in comparison with pure n-butanol, the peak cylinder pressure increased 18.62%, 22.86% and 25.41% at φ H 2 = 5%, φ H 2 = 10% and φ H 2 = 15%, respectively. Meanwhile, the process of heat release can be accelerated and concentrated by hydrogen blending. The HC and CO emissions decreased gradually with the increase of hydrogen fraction. The largest magnitude of reduced HC and CO emissions was at φ H 2 = 5% as 31.31% and 19.05%, respectively. In terms of unregulated emissions, the acetaldehyde emissions remained a higher level than formaldehyde emissions for all hydrogen fractions at idle condition, and both decreased with the increase of hydrogen fraction. The distribution of formaldehyde and acetaldehyde concentration were closely related to the temperature field inside cylinder. The improvement of acetaldehyde emissions affected by adding hydrogen was more significant than that of formaldehyde emissions. Through hydrogen direct injection, a local hydrogen-enriched area near the spark plug can be formed, which contributed to better combustion performance of n-butanol engine at idle condition.
- Published
- 2019
33. Investigation of combustion and emissions of an SI engine with ethanol port injection and gasoline direct injection under lean burn conditions
- Author
-
Hang Yang, Ze Liu, Zezhou Guo, Zhe Li, Zhen Shang, Jingyuan Li, Li Anshi, Xiumin Yu, Ping Sun, and Sen Wang
- Subjects
Pollution ,Particle number ,020209 energy ,Mechanical Engineering ,media_common.quotation_subject ,02 engineering and technology ,Building and Construction ,Combustion ,Pulp and paper industry ,Industrial and Manufacturing Engineering ,General Energy ,020401 chemical engineering ,0202 electrical engineering, electronic engineering, information engineering ,Environmental science ,Ethanol fuel ,0204 chemical engineering ,Electrical and Electronic Engineering ,Gasoline ,Gasoline direct injection ,Lean burn ,NOx ,Civil and Structural Engineering ,media_common - Abstract
In order to reach the goal of energy conservation and pollution emissions reduction, the combustion and emissions of a combined injection engine with ethanol port injection and gasoline direct injection under lean burn conditions are investigated in this paper. The experiments are carried out by using different direct injection timing (DIT), gasoline addition ratio (αgasoline) and excess air ratios (λ). The results indicate that Tmax declines after gasoline addition at λ = 1, 1.2, while increases after gasoline addition at λ = 1.4. The IMEP reaches the maximum value at DIT = 90 or 105 °CA BTDC and 0%, 10% and 30% gasoline addition bring the highest IMEP at λ = 1, 1.2 and 1.4, respectively. The COVIMEP decreases continuously with the increase of αgasoline and the EPI+GDI mode has great advantages in improving the combustion stability under λ = 1.4 condition. As for gaseous emissions, from λ = 1 to λ = 1.4, HC emissions change from increasing trend to the decreasing trend with the increase of αgasoline, while the NOx emissions show the opposite. As for particle number, at λ = 1 and 1.2, the total particle number (TPN) shows an upward trend with the increase of αgasoline. When λ = 1.4, TPN decreases with the increase of αgasoline.
- Published
- 2019
34. Improving dispersion stability of hydrochloric acid hydrolyzed cellulose nano-crystals
- Author
-
Lin Dai, Zhen Shang, Frederikus Tunjung Seta, Xingye An, Yonghao Ni, Hongbin Liu, Mengxia Shen, and Mingshuai Ma
- Subjects
Steric effects ,Ammonium bromide ,Materials science ,Polymers and Plastics ,Biocompatibility ,Organic Chemistry ,Hydrochloric acid ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,Hydrolysis ,Adsorption ,chemistry ,Chemical engineering ,Dispersion stability ,Materials Chemistry ,Cellulose ,0210 nano-technology - Abstract
Cellulose nano-crystals (CNC) have attracted great interests as a novel nanostructured material in recent years, thanks to their excellent mechanical properties, high surface area and lightweight and biocompatibility etc. Due to its low charged group content, CNC prepared from the hydrochloric acid hydrolysis has poor dispersibility in water, which hinders its further applications. In this work, well-dispersed cellulose nano-crystals are successfully prepared using a two-step method, consisting of hydrochloric acid hydrolysis, followed by adsorption of hexadecyl trimethyl ammonium bromide (CTAB) onto CNC. Results show that CTAB at a low concentration (0.13–0.47 mM) provides effective steric barriers to minimize the CNC aggregation, which is supported by TEM images and particle size distribution of CNC. At high CTAB concentrations (>0.5 mM), CNC aggregation occurs, which is due to the “bridging” effect of CTAB.
- Published
- 2019
35. Microwave-assisted alkali extraction of bagasse hemicellulose enhanced by an enzymatic pretreatment process
- Author
-
Bing Sun, Huang Jizhen, Yu Xin Liu, and Zhen Shang
- Subjects
Materials science ,Chromatography ,Organic Chemistry ,Extraction (chemistry) ,Biomass ,Forestry ,Biochemistry ,Biomaterials ,chemistry.chemical_compound ,Fiber cell ,chemistry ,Biofuel ,Yield (chemistry) ,Scientific method ,Materials Chemistry ,Hemicellulose ,Bagasse - Abstract
Extraction of hemicelluloses is a primary step in the conversion of plant biomass to valuable biofuels and chemicals. Hemicellulose is distributed in the fiber cell wall, and the compact structure of the fiber cell wall barricades the transport of hemicelluloses in the extraction process. In this paper we presented a novel microwave-assisted extraction process enhanced with an enzymatic pretreatment to improve the hemicelluloses extraction rate from bagasse. Experimental results showed that the enzyme dosage, alkali concentration and microwave irradiation time were main factors governing the yield of hemicellulose. The optimal conditions of the enzymatic pretreatment were: enzyme dosage of 138 IU/g bagasse and irradiation time of 30 min. Under these conditions, 86% of the hemicellulose in bagasse was extracted. After the enzymatic pretreatment the surface area of bagasse increased significantly which facilitated the subsequent microwave-assisted extraction process.
- Published
- 2017
36. Deformation mechanism and forming properties of 6061Al alloys during compression in semi-solid state
- Author
-
Cheng-ming Wu, Xiao-ling Tang, Shu-zhen Shang, Gui-min Lu, and Zu-xin Zhao
- Subjects
Materials science ,Metallurgy ,Metals and Alloys ,Portevin–Le Chatelier effect ,Diffusion creep ,Superplasticity ,Flow stress ,Strain rate ,Geotechnical Engineering and Engineering Geology ,Condensed Matter Physics ,Stress (mechanics) ,Condensed Matter::Materials Science ,Deformation mechanism ,Materials Chemistry ,Deformation (engineering) - Abstract
The 6061 semi-solid aluminium alloy feedstocks prepared by near-liquidus casting were compressed in semi-solid state by means of Gleeble-3500 thermal-mechanical simulator. The relationship between the true stress and the true strain at different temperatures and strain rates was studied with the deformation degree of 70%. The microstructures during the deformation process were characterized. The deformation mechanism and thixo-forming properties of the semi-solid alloys were analyzed. The results show that the homogeneous and non-dendrite microstructures of semi-solid 6061Al alloy manufactured by near-liquidus casting technology could be transformed into semi-solid state with the microstructure suitable for thixo-forming which are composed of near-spherical grains and liquid phase with eutectic composition through reheating process. The deformation temperature and strain rate affect the peak stress significantly rather than steady flow stress. The resistance to deformation in semi-solid state decreases with the increase of the deformation temperature and decrease of the strain rate. At steady thixotropic deformation stage, the thixotropic property is uniform, and the main deformation mechanism is the rotating or sliding between the solid particles and the plastic deformation of the solid particles.
- Published
- 2010
37. Scutellaria flavonoid reduced memory dysfunction and neuronal injury caused by permanent global ischemia in rats
- Author
-
Hong Miao, Jian-Jun Cheng, Ya-Zhen Shang, and Jie-Min Qi
- Subjects
medicine.medical_specialty ,Scutellaria ,Clinical Biochemistry ,Ischemia ,Morris water navigation task ,Toxicology ,Biochemistry ,Brain Ischemia ,Rats, Sprague-Dawley ,Lesion ,Behavioral Neuroscience ,symbols.namesake ,Internal medicine ,medicine ,Animals ,Vascular dementia ,Biological Psychiatry ,Flavonoids ,Neurons ,Pharmacology ,Memory Disorders ,biology ,business.industry ,biology.organism_classification ,medicine.disease ,Rats ,medicine.anatomical_structure ,Endocrinology ,nervous system ,Cerebral cortex ,Nissl body ,symbols ,Scutellaria baicalensis ,Female ,Neuron ,medicine.symptom ,business ,Neuroscience - Abstract
The purpose of this study is to investigate the effects of flavonoid, isolated from aerial parts of Scutellaria baicalensis Georgi (SSF), on memory deficits, neuronal degeneration and abnormal energy metabolism induced by permanent global ischemia in rats. The global ischemia was produced in female Sprague-Dawley rats by permanent occlusion of the bilateral common carotid arteries. The permanent global ischemia in rats resulted in a significantly increased latency of the rat to find the hidden platform and a decreased swimming distance from the target quadrant in the Morris water maze task. The pathological changes in the neurons of ischemic rats, observed in the hippocampus and cerebral cortex, included neuron loss, neuron swelling, nuclear shrinkage or disappearance, neuronophagia and reduced density of Nissl bodies in the neuron. Moreover, the levels of lactate and ATPase activity in ischemic rats were notably increased and decreased, respectively, in the hippocampus and cerebral cortex as compared with sham-operated rats. Daily oral administration of SSF (35 mg/kg, 19-20 days) dramatically reduced the decrease in learning and memory, attenuated neuronal injury and improved abnormality of energy metabolites in rats induced by global ischemia. These findings suggest that SSF may be beneficial for the treatment of vascular dementia.
- Published
- 2005
38. Quasi-periodic pulsation and the elementary flare bursts of the radio spike event of 1989 August 17
- Author
-
Yuan-Fang Gong, En-Rui Lou, Qiong-Zhen Shang, Yong-Jin Kong, and Heng Zhang
- Subjects
Physics ,Space and Planetary Science ,law ,Event (relativity) ,Astronomy ,Astronomy and Astrophysics ,Spike (software development) ,Astrophysics ,Quasi periodic ,Flare ,law.invention - Published
- 1994
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