Paleomagnetism has played an important role in quantifying the Mesozoic evolution of “Proto-Tibet”. In this paper, we present new paleomagnetic data from five Middle-Upper Jurassic sedimentary ...sequences (Quemo Co, Buqu, Xiali, Suowa and Xueshan Fms.) of the eastern North Qiangtang Terrane (QT) at Yanshiping (33.6°N, 92.1°E). The new paleomagnetic results form a large dataset (99 sites, 1702 samples) and reveal a paleopole at 79.1°N/306.9°E (dp=3.9°, dm=6.3°) for the Quemo Co Fm., at 68.9°N/313.8°E (dp=2.1°, dm=3.7°) for the Buqu Fm., at 66.1°N/332.1°E (dp=2.7°, dm=4.6°) for the Xiali Fm., at 72.4°N/318.6°E (dp=3.9°, dm=6.7°) for the Suowa Fm., and at 76.9°N/301.1°E (dp=7.9°, dm=13.2°) for the Xueshan Fm. These results indicate clockwise (CW) rotations of ~19.8±9.4° between ~171.2 and 161.7Ma and counterclockwise (CCW) rotations of ~15.4±13.4° between ~161.7 and <157.2Ma for Yanshiping. We attribute the change in rotation sense at approximately ~161.7Ma to the initial collision of the Lhasa and Qiangtang terranes. Using this and other paleomagnetic data from the Lhasa, Qiangtang and Tarim terranes, as well as other geological evidence (e.g., tectonism-related sedimentary sequences, volcanism, and HP metamorphism), we propose a new conceptual evolution model for the Mesozoic QT and Tethyan Oceans. The Longmo Co-Shuanghu oceanic slab was subducted before 248Ma, followed by continental collision of the North-South Qiangtang subterranes between ~245 and 237Ma. The Qiangtang Terrane experienced post-collisional exhumation between ~237 and 230Ma during subduction of the Jinsha oceanic slab. The collision of the Qiangtang and Songpan-Ganzi terranes occurred between ~230 and 225Ma. The QT experienced post-collisional relaxation from ~225 to ~200Ma, followed by subsidence and extension-related exhumation between ~200 and 162Ma in association with subduction of the Bangong-Nujiang oceanic slab. Finally, these events were followed by the scissor-like diachronous collisions of the Lhasa and Qiangtang terranes between ~162Ma and the mid-Cretaceous.
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•Overlapped latitudes with change in rotation sense imply collision of LS-QT in J3.•Overlapped latitudes with change in rotation sense imply collision of QT-TB in T3.•Integrated evidences reveal 7-step Mesozoic tectonic activities of the region.
Silicone rubber (SR)/vinyl-graphene oxide (vinyl-GO) nanocomposites were prepared through the hydrosilylation reaction of silicon hydrogen polydimethylsiloxane (H-PDMS) with vinyl ...polydimethylsiloxane (vinyl-PDMS), in which vinyl-GO was used as a nano filler. The thermally conductive and antistatic properties of the nanocomposites, and their tensile strength and thermal stability were evaluated. The thermally conductive and antistatic properties increased naturally when the nanocomposites had eight to nine parts of vinyl-GO. The addition of 9 parts of vinyl-GO increased the thermal conductivity to 0.44 from 0.17 W/m−1·K−1 of neat SR and the surface resistance value to 108 from 1014 Ω of neat SR. Vinyl-GO is effective in improving the tensile strength and toughness of the nanocomposites. The tensile strength and elongation at break of the nanocomposites were much higher than that of neat SR, especially for 10 parts of vinyl-GO in the nanocomposite, and the tensile strength was 1.84 MPa and the elongation at break was 314.1%. Additionally, compared with neat SR, the nanocomposites had a much higher thermal stability. For eight parts of vinyl-GO in the nanocomposites, H-PDMS with the selected silicon hydrogen content and vinyl-PDMS with the selected vinyl content could offer an appropriate cross-linking degree that suits the character of GO. When the nanocomposite had eight parts of vinyl-GO, its scanning electron microscope exhibited a monolayer GO with folded, twisted, and local surface folds. However, there was a certain amount of multilayer aggregation of GO for 10 parts of vinyl-GO in the nanocomposite.
Realizing a high color rendering index (CRI) in Ce:LuAG transparent ceramics (TCs) with desired thermal stability is essential to their applications in white LEDs/LDs as color converters. In this ...study, based on the scheme of configuring the red component by Cr
3+
doping, an efficient spectral regulation was realized in Ce,Cr:LuAG TCs. A unilateral shift phenomenon could be observed in both photoluminescence (PL) and photoluminescence excitation (PLE) spectra of TCs. By constructing TC-based white LED/LD devices in a remote excitation mode, luminescence properties of Ce,Cr:LuAG TCs were systematically investigated. The CRI values of Ce:LuAG TC based white LEDs could be increased by a magnitude of 46.2%. Particularly, by combining the as fabricated Ce,Cr:LuAG TCs with a 0.5 at% Ce:YAG TC, surprising CRI values of 88 and 85.5 were obtained in TC based white LEDs and LDs, respectively. Therefore, Ce,Cr:LuAG TC is a highly promising color convertor for high-power white LEDs/LDs applied in general lighting and displaying.
In the context of global carbon neutrality, ports face significant electricity demand for cargo handling and pressure to reduce carbon emissions. The abundant wind energy resources in port areas make ...wind power highly promising for port applications. The optimal selection of site and turbine types for wind power systems can effectively reduce emissions in ports, achieving sustainability and improving economic benefits. The practical implementation of wind energy systems considering practical constraints holds significant research significance. Taking Ningbo-Zhoushan Port as an example, this paper analyzes the wind energy resources in the port area and provides an overview of wind power system construction sites. Based on the actual conditions of the port area, this paper comprehensively reviews the site selection of wind turbines from the perspectives of wind resources, specific climates, and noise impacts. With the consideration of engineering preferences, this paper selects performance indicators based on the four mainstream turbine models and proposes a comprehensive weight determination method using the entropy weight method and analytic hierarchy process (AHP) to determine the weights of the indicators. The Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) method is then employed to score and compare four turbine plans, enabling the turbine selection process to consider both engineering preferences and objectivity, thereby enhancing the accuracy and reliability of wind turbine planning and achieving significant ecological and economic benefits through benefit analysis.
Application of the green port technology Guo, Xu; Ren, Haidong; Jiang, Tao
Journal of physics. Conference series,
05/2021, Letnik:
1920, Številka:
1
Journal Article
Recenzirano
Odprti dostop
Abstract
Green development is the future development direction of the port, and the foundation of green port construction is the application of new technology. This paper introduces the key ...technology ( Application of high voltage shore power, Large scale application of RTG oil to electricity, Application of intelligent and precise dust suppression technology in coal terminal) applications of several types of green port development, and provides suggestions for the future development of the port.
As a valuable biomass resource, a large number of Chinese medicine residue have not been effectively utilized and are often treated as garbage, which not only causes environmental pollution, but also ...leads to the waste of resources. Ganoderma lucidum is a common raw material of Chinese herbal medicine, its natural mycelium and tube structure is conducive to the formation the porous structure of carbon materials. In this paper, porous carbon materials with high specific surface area and high pore volume were prepared by high temperature carbonization in nitrogen atmosphere using Ganoderma lucidum residue as a raw material and KOH as an alkali activator. The morphology and pore structure of the prepared carbon materials were analyzed and characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction, Raman spectroscopy and nitrogen adsorption method. When the mass ratio of carbon to alkali was 1:4 and the temperature was 800 °C, ultra-high specific surface area microporous carbon materials were obtained with specific surface area of 3425 m3 g−1 and total pore volume of 1.74 cm3 g−1. The prepared porous carbon material was assembled into hydrogen peroxide electrode and cholesteric oxide modified electrode, which showed good catalytic performance.
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•High added value utilization of Ganoderma lucidum residues was reported.•The mycelium and tube structure of Ganoderma lucidum are conducive to the high specific surface area of materials.•The morphology, structure and properties of the materials were characterized in detail.•The prepared carbon materials have good application potential in electrode materials.
Cambrian mafic to felsic intrusive rocks intruding Precambrian rocks are recognized along the southern margin of the North Qilian suture zone. These intrusive rocks predate final closure of the North ...Qilian Ocean and consideration of these rocks is essential to any reconstruction of the tectonic framework of the Qilian Orogen. They include 517 Ma transitional IS type granite, 510 Ma I-type calc-alkaline diorite, 509–505 Ma calc-alkaline gabbro, and 498 Ma shoshonitic monzonite as well as highly fractionated syenogranite. Distinctive geochemical signatures and Sr-Nd-Hf isotopic compositions indicate derivation from multiple magma sources associated with subduction. Moreover, tectonostratigraphic correlation indicates that the Precambrian rocks along the southern margin of the North Qilian suture zone were associated with the Central Qilian microcontinent. These Cambrian mafic to felsic intrusive rocks are likely to be magmatic products of a continental arc built on the northern margin of the Central Qilian microcontinent during the processes of southward subduction of the North Qilian Ocean. Together, a Cambrian Andean-type arc, Cambrian-Ordovician Mariana-type intra-oceanic arc and multiple Early Paleozoic accretionary complexes within the North Qilian suture zone attest to various subduction-accretion processes that occurred within the Proto-Tethyan Ocean from Cambrian to Middle Ordovician time prior to terminal continental collision.
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•Cambrian mafic to felsic intrusive rocks intruding Precambrian rocks are recognized along the North Qilian suture zone.•These Cambrian intrusions are likely to be products of the continental arc magmatism.•The Cambrian continental arc was built on the northern margin of Central Qilian microcontinent.•The Proto-Tethyan Ocean experienced multiple subduction-accretion processes prior to terminal continental collision.
Compared to typical multi-sensor systems, monocular 3D object detection has attracted much attention due to its simple configuration. However, there is still a significant gap between LiDAR-based and ...monocular-based methods. In this paper, we find that the ill-posed nature of monocular imagery can lead to depth ambiguity. Specifically, objects with different depths can appear with the same bounding boxes and similar visual features in the 2D image. Unfortunately, the network cannot accurately distinguish different depths from such non-discriminative visual features, resulting in unstable depth training. To facilitate depth learning, we propose a simple yet effective plug-and-play module, O ne B ounding Box M ultiple O bjects (OBMO). Concretely, we add a set of suitable pseudo labels by shifting the 3D bounding box along the viewing frustum. To constrain the pseudo-3D labels to be reasonable, we carefully design two label scoring strategies to represent their quality. In contrast to the original hard depth labels, such soft pseudo labels with quality scores allow the network to learn a reasonable depth range, boosting training stability and thus improving final performance. Extensive experiments on KITTI and Waymo benchmarks show that our method significantly improves state-of-the-art monocular 3D detectors by a significant margin (The improvements under the moderate setting on KITTI validation set are <inline-formula> <tex-math notation="LaTeX">{1.82\sim 10.91\%} </tex-math></inline-formula> mAP in BEV and <inline-formula> <tex-math notation="LaTeX">{1.18\sim 9.36\%} </tex-math></inline-formula> mAP in 3D). Codes have been released at https://github.com/mrsempress/OBMO .
Cellulose-based electroactive actuators are promising for biomimetic robots and biomedical applications due to the biocompatibility; however, they exhibit inferior actuation performance normally than ...traditional conductive polymer actuators. Doping some ions can improve actuation, because ion migration plays an important role for cellulose-based electroactive actuators. In this work, the effects of ions on the structure, mechanical strength and electroactive performance of cellulose nanofibril (CNF) actuators were investigated in order to further clarify the mechanism of ions migration. CNFs from mechanical grinding have very low content of ions and show no obvious electroactive behaviour. After doping with inorganic salts or ionic liquids, the electroactive properties of the CNF composites are significantly improved. The composite actuators containing NH
4
Cl and EMIMCl exhibited the tip displacements as high as − 33.52 mm in 10 s and − 23.34 mm in 3.5 s under 9 V DC, respectively. Comparing electroactive performance of actuators with different ions, it is found that hydration enthalpy of ions has a close relationship with electroactive properties. The composite actuators with EMIMCl showed good actuation durability under 5 V/0.1 Hz AC for 50 cycles without displacement attenuation. Overall, this study demonstrated the mechanism of ions migration in cellulose-based electroactive materials, and it provides new insight for relationship between hydration enthalpy of ions and electroactive property of cellulose-based actuators, which is expected to design the cellulose-based electroactive actuators with the adjustable electroactive property.
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