This study reviewed the mobile technology-supported music education (MTSME) studies published in several academic databases, namely Scopus, WOS, ERIC, and RILM, from 2008-2019. Based on the technology-based learning m...
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High- and medium-Mn (H/M-Mn) base lightweight steels are a class of ultrastrong structural materials with high ductility compared to their low-Mn counterparts with low strength and poor ***, producing these H/M-Mn mat...
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High- and medium-Mn (H/M-Mn) base lightweight steels are a class of ultrastrong structural materials with high ductility compared to their low-Mn counterparts with low strength and poor ***, producing these H/M-Mn materials requires the advanced or high-tech manufacturing techniques, which can unavoidably provoke labor and cost concerns. Herein, we have developed a facilestrategy that circumvents the strength–ductility trade-off in low-Mn ferritic lightweight steels, by employing low-temperature tempering-induced partitioning (LTP). This LTP treatment affords a typical Fe-2.8Mn-5.7Al-0.3C (wt.%) steel with a heterogeneous size-distribution of metastable austenite embeddedin a ferrite matrix for partitioning more carbon into smaller austenite grains than into the larger austenite ones. This size-dependent partitioning results in slip plane spacing modification and lattice strain,which act through dislocation engineering. We ascribe the simultaneous improvement in strength andtotal elongation to both the size-dependent dislocation movement in austenite grains and the controlleddeformation-induced martensitic transformation. The low-carbon-partitioned large austenite grains increase the strength and ductility as a consequence of the combined martensitic transformation andhigh dislocation density-induced hardening and by interface strengthening. Additionally, high-carbonpartitioned small austenite grains enhance the strength and ductility by planar dislocation glide (inthe low strain regime) and by cross-slipping and delayed martensitic transformation (in the high strainregime). The concept of size-dependent dislocation engineering may provide different pathways for developing a wide range of heterogeneous-structured low-Mn lightweight steels, suggesting that LTP maybe desirable for broad industrial applications at an economic cost.
The Shunbei oilfield is a fault-controlled fracture-vuggy reservoir in carbonate rocks, and hydraulic fracturing is usually used in this type of oilfield to improve the flow performance of the reservoir. In the hydrau...
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The Shunbei oilfield is a fault-controlled fracture-vuggy reservoir in carbonate rocks, and hydraulic fracturing is usually used in this type of oilfield to improve the flow performance of the reservoir. In the hydraulic fracturing process, the three-dimensional in-situ stress field is one of the important factors affecting the fracture propagation trajectory. Therefore, the study of the fine spatial distribution of the three-dimensional in-situ stress field is the primary problem to be solved in the hydraulic fracturing process. Aiming at the inaccurate simulation of the spatial distribution of in-situ stress field during hydraulic fracturing of fractured-vuggy carbonate reservoirs, the " geology-engineering" coupling platform was developed. This platform enabled the conversion of geological models into formats compatible with the AiFrac numerical simulation software, facilitating a refined characterization of the three-dimensional in-situ stress field within the reservoir. Based on the three-dimension geological model constructed using corner grid technology, the numerical simulation software was employed to simulate the three-dimensional stress field within the geological formation. This approach enabled the preservation of the intricate structural features of the reservoir while leveraging the computational capabilities provided by the numerical simulation software. Consequently, the integration of the geological model and numerical simulation was achieved. In order to verify the effectiveness of the proposed method, the three-dimensional in-situ stress field of Shunbei oilfield based on the existing in-situ stress measurement data was analyzed and calculated. The results show that faults have a significant impact on the direction and magnitude of the in-situ stress field, mainly in that the scale, dip, strike, and shape of the faults affect the in-situ stress state to varying degrees. The proposed precise simulation method for three-dimensional in-situ stress c
Recently proton exchange membrane fuel cells (PEMFC) are widely used in various commercialization scenarios such as automobiles. However, there are still challenges in extracting the health indicators of PEMFC under d...
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With the enormous evolution of the smartphone, especially with the appearance of the fourth generation (4G) cellular networks, the demand for high-speed data rate, low latency, and video streaming have been increased....
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While the research on Augmented Reality (AR) predominantly emphasises technical advancements in devices, visualisation, and interactivity, it often overlooks the perspectives of everyday users regarding the integratio...
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ISBN:
(纸本)9798400717079
While the research on Augmented Reality (AR) predominantly emphasises technical advancements in devices, visualisation, and interactivity, it often overlooks the perspectives of everyday users regarding the integration of AR into their daily practices, social interactions, and creativity. To address this gap, we conducted workshops with a group of eight older creative writers to explore the potential of AR in their creative process. Our analysis, based on a postphenomenological perspective, reveals the complex nested worlds and narratives within participants' perspectives. We present the notion of multifocal realities in the design of AR technology to consider the layered and parallel realities users see, feel, and experience in creative collaborations. This view promotes an expansion of AR research from a technical perspective to understand the concurrent experiences in augmenting reality, what new forms of creativity and socialisation this may support, and what it means to live in an augmented and augmentable world.
This study uses response surface methodology (RSM) with a central composite design to optimize the HY wet ball mill work index. Key operational parameters—ore quantity, water addition, and media proportion—were syst...
This study uses response surface methodology (RSM) with a central composite design to optimize the HY wet ball mill work index. Key operational parameters—ore quantity, water addition, and media proportion—were systematically investigated. Variance analysis identified these factors as statistically significant (p < 0.0001), with ore quantity exhibiting the strongest influence (F value = 82.67). Optimal conditions (water addition: 1083.880 mL, media filling rate: 40.362%, ore quantity: 1827.130 g) achieved a minimum work index of 10.195 kW h t−1. Validation tests confirmed the model’s accuracy, yielding an average work index of 10.168 kW h t−1 (deviation: 0.027 kW h t−1). Compared to single-factor tests, RSM optimization reduced energy consumption by 3.76% (0.3975 kW h t−1), translating to annual savings of $214,000 for a mid-sized processing plant. This demonstrates RSM’s efficacy in bridging the gap between laboratory-scale experiments and industrial grinding optimization.
Due to the small size effect, nano-metal paste is regarded as the famous die-attach material. Nano metal paste has excellent thermal conductivity, which could be used to prepare high-temperature resistant interconnect...
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ISBN:
(数字)9798350353808
ISBN:
(纸本)9798350353815
Due to the small size effect, nano-metal paste is regarded as the famous die-attach material. Nano metal paste has excellent thermal conductivity, which could be used to prepare high-temperature resistant interconnect joints at low temperatures. Unfortunately, during the sintering process, nano-silver paste has a high porosity and is prone to electromigration. Nano-Cu paste is prone to oxidation, which is not conducive to the mechanical properties of interconnect structures. The nanocomposite paste of Cu and Ag has gradually gained widespread attention, such as Cu-Ag mixed structure and Cu@Ag coating structure. These can effectively hinder the oxidation of Cu nanoparticles and the electromigration of Ag nanoparticles, which is beneficial for improving the service characteristics of power devices. However, the sintering mechanism of composite nanoparticles has not been revealed, and the industrial application of composite paste lacks theoretical analysis. In this paper, molecular dynamics (MD) is used to describe the sintering behavior of Cu@Ag composite nanoparticles. The effects of Ag surface coating thickness and sintering heating speed on sintering properties were investigated. The MD results show thinner Ag shells and slower heating rates are beneficial for atomic diffusion and improve the reliability of nanoparticle sintering. The degree of sintering is closely related to atomic motion and energy conversion. The phase transition form of nanoparticles is affected by the heating rate.
In this paper, a robust attitude autopilot for spinning glide guided projectile is presented. Combing with the idea of trajectory linearization control (TLC), a TLC based fixed-time converged integral sliding mode con...
In this paper, a robust attitude autopilot for spinning glide guided projectile is presented. Combing with the idea of trajectory linearization control (TLC), a TLC based fixed-time converged integral sliding mode control scheme is present. Moreover, to estimate and compensate total uncertainties, a reduced-order extended state observer is developed. The stability of closed-loop system is verified via Lyapunov method. Finally, numerical simulation is carried out to demonstrate the efficiency of proposed attitude autopilot.
In this article, we describe the Registry of Scientometric Data Sources (RSDS) and several scientometric data sources recorded in this open registry that could be of interest for scientometricians, institutional resea...
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