The increasing prominence of data centers (DCs) in the global digital economy has raised concerns about energy consumption and carbon emissions. Simultaneously, the rapid advancement of integrated energy systems (IES) has enabled DCs to efficiently harness clean energy and waste heat, contributing to sustainability. A concept of data center integrated energy system (DC-IES) is introduced in this paper, and its generalization, approaches, methods, techniques, and future perspectives are scrutinized on the utilization of renewable energy, recovery of waste heat, construction of producer and consumer and diversity of system architecture, as well as optimization solutions in DC-IES planning and design. The evaluation indicators and optimization objectives of DC-IES are also discussed from perspectives of energy, water, economy, environment and reliability. Furthermore, innovative models are proposed for DC-IES to actively engage in the interaction between computing networks and power grids as well as heating networks respectively, while also emphasizing their associated research through the technical principles, participating elements and benefit impacts. It reveals that the integration of non-interactive workloads in the computing network, along with the utilization of flexible resources from diesel generators and uninterruptible power supply, as well as the implementation of waste heat recovery technologies such as heat pumps and absorption refrigeration systems, will significantly enhance the planning and operation of DC-IES. Finally, a series of challenges and future perspectives related to the reliability and cost-effectiveness encountered in the optimization of DC-IES are revealed.

Deep space exploration expands our understanding about the evolution history of solar system, while the future development heavily relies on the construction of energy systems and utilization of resources on the planet. This paper systematically reviewed the progress in the environmental control and construction technologies of space bases, extraterrestrial in situ resource utilization technology, energy systems, key technologies for planetary transportation platforms, and geological explorations. The current status, pros and cons of these technologies and systems are introduced and discussed. As an important artificial microenvironment in the space base, the environmental control and life support system (ECLSS) provides necessary resources for human. Sintering and additive manufacturing technologies demonstrate the potential to construct a space base with lunar regolith or simulants. The extraction and in situ utilization of resources on the Moon, including water ice, oxygen, and helium-3, are crucial to maintain life support for lunar exploration. Typical energy systems that can be used on the Moon include photovoltaic cell, Stirling power generation technology, closed Brayton cycle (CBC) system, Rankine cycle system, heat storage system, and integrated energy system. The CBC system has the highest thermal efficiency (39%) among them, making it suitable for late-period energy supply. The performance of various planetary rovers, the most important transportation platforms, are summarized. Through geological explorations, the resource distribution, content, and occurrence can be obtained. Perspectives on the future, promotions of environment adaptation, resource recovery, energy efficiency, and intelligence of the existing technologies are still needed to move forward on space explorations.

Early aging diagnosis of winding insulation is crucial for preventing insulation failures. However, early aging suffers from unclear mechanisms and weak changes of electrical parameters, which makes it difficult for mechanism and intelligent diagnosis approaches to achieve effective modeling. To address this issue, this article proposes a mechanism-guided intelligent enhancement method for early aging information based on the common-mode impedance spectrum. First, an effective mechanism knowledge focusing strategy is proposed, which can effectively alleviate coupling of aging mechanism features under different aging types, so as to provide the pure mechanism features for the dynamic knowledge matching. Then, a dynamic knowledge matching strategy is presented, by which aging mechanism features and early aging information are reliably matched, thereby supporting the strong generalization of the mechanism-guided reconstruction. Finally, a mechanism-guided reconstruction network is constructed to enhance the insulation early aging information, so as to achieve high accuracy and strong-generalization diagnosis modeling of insulation early aging. Notably, our method provides a promising solution for the diagnosis modeling of early aging. The experimental results on a 4-kW permanent magnet synchronous motor drive system demonstrate that our work outperforms the existing methods, which achieves the 60.74% reduction in the early aging diagnosis error of winding insulation.

As advancements in aerospace technology continue, reentry conditions pose increasingly rigorous requirements for thermal protection materials. Among these, fiber-reinforced phenolic resin composites have drawn substantial interest for their robust thermal insulation capabilities and enhanced ablation resistance, mechanical strength, and long-term reliability. This paper provides a comprehensive review of recent developments in fiber-reinforced phenolic resin composites, examining factors such as resin density, nanopore size within the matrix, resin cross-linking density, fiber–resin interfacial bonding, fiber length, fiber crystallization degree, and fiber weave structures that collectively influence composite performance. The typical applications of these composites in ultrahigh-speed aircraft are also discussed. Furthermore, the paper offers recommendations for future advancements focusing on optimizing mechanical, ablative, and insulation properties to meet the multifunctional demands of thermal protection materials.

Magnetocaloric effect (MCE) and magnetic phase transition of Ho₃Co compound have been investigated. The two successive magnetic transitions: spin–reorientation transition at T_SR = 8.5 K and antiferromagnetic (AFM)–paramagnetic transition at the Néel temperature T_N = 21 K are observed. The Ho₃Co compound undergoes a field-induced metamagnetic transition from AFM to ferromagnetic states below T_N, which leads to a large MCE. The maximal value of magnetic entropy change (ΔS_M) is found to be −14.5 J/kg K with a refrigerant capacity (RC) value of 440 J/kg around T_N for a field change of 0–5 T. The large ΔS_M as well as considerable RC in Ho₃Co is very useful for applying it to the magnetic refrigeration in low-temperature ranges.

Condensation frosting usually causes a negative influence on heat exchangers employed in engineering fields. As the relationships among the first three typical condensation frosting stages in the edge regions of cold plates are still unclear, an experimental study on the localized condensation frosting characteristics in the edge region of a cold plate was conducted. The edge effects on the water droplet condensation (WDC), water droplet frozen (WDF) and frost layer growth characteristics were quantitatively investigated. The results showed that the number of droplets coalescing in the edge-affected regions was around 50% greater than in the unaffected regions. At the end of the WDC stages, the area-average equivalent contact diameter and coverage area ratio of water droplets in the edge-affected regions were 2.69 times and 11.6% greater than those in the unaffected regions under natural convection, and the corresponding values were 2.24 times and 9.9% under forced convection. Compared with the unaffected regions, the WDF stage duration in the edge-affected regions decreased by 63.6% and 95.3% under natural and forced convection, respectively. Additionally, plate-type and feather-type frost crystals were, respectively, observed in natural and forced convection. The results of this study can help in the better understanding of the condensation frosting mechanism on a cold plate, which provides guidelines for optimizing the design of heat exchanger structures and system control strategies facing frosting problems.