摘要：Phase change materials (PCMs) can be incorporated with low-cost minerals to synthesize composites for thermal energy storage in building *** coal (SC) after vanadium extraction treatment shows potential for secondary utilization in composite *** prepared SC-based composite PCMs with SC as a matrix,stearic acid (SA) as a PCM,and expanded graphite (EG) as an *** combined roasting and acid leaching treatment of raw SC was conducted to understand the effect of vanadium extraction on promoting loading *** showed that the combined treatment of roasting at 900℃ and leaching increased the SC loading of the composite by 6.2%by improving the specific surface *** loading capacity and thermal conductivity of the composite obviously increased by 127%and 48.19%,respectively,due to the contribution of 3wt% *** data were supported by the high load of 66.69%and thermal conductivity of 0.59 W·m^(-1)·K-1of the designed *** obtained composite exhibited a phase change temperature of 52.17℃,melting latent heat of 121.5 J·g^(-1),and good chemical *** SC-based composite has prospects in building applications exploiting the secondary utilization of minerals.

摘要：Free electron lasers provide high-power and ultrashort pulses with extreme brightness. In order to improve a facility's capabilities and explore the possibility of performing high-resolution time-resolved experiments, a beam arrival time resolution under 100 fs is required. In this article, a novel beam arrival time monitor(BAM)equipped with two cavities has been designed and a beam flight time measurement scheme based on the BAM prototype has been proposed to estimate phase jitter in the signal measurement system. The two BAM cavities work at different frequencies and the frequency difference is designed to be 35 MHz. Therefore, a self-mixing intermediate frequency signal can be generated using the two cavities. The measured beam flight time shows a temporal deviation of 37 fs(rms).

摘要：The underlying spin-related mechanism remains unclear,and the rational manipulation of spin states is challenging due to various spin configurations under different coordination ***,it is urgent to study spin-dependent oxygen evolution reaction(OER)performance through a controllable ***,we adopt a topochemical reaction method to synthesize a series of selenides with eg occupancies ranging from 1.67 to *** process begins with monoclinic-CoSeO_(3),featuring a distinct laminar structure and Co-O6 *** topochemical reaction induces significant changes in the crystal field's intensity,leading to spin state *** transitions are driven by topological changes from a Co-O-Se-O-Co to a Co-Se-Co configuration,strengthening the crystalline field and reducing eg orbital *** reconfiguration of spin states shifts the rate-determining step from desorption to adsorption for both OER and the hydrogen evolution reaction(HER),reducing the potential-determined step barrier and enhancing overall catalytic *** a result,the synthesized cobalt selenide exhibits significantly enhanced adsorption *** material demonstrates impressive overpotentials of 35 mV for HER,250 mV for OER,and 270 mV for overall water splitting,indicating superior catalytic activity and ***,a negative relation between eg filling and OER catalytic performance confirms the spin-dependent nature of *** findings provide crucial insights into the role of spin state transitions in catalytic performance.

摘要：本综述从总体布局层面综述火箭基组合循环(RBCC)发动机在各个国家的发展现状,旨在展现该型发动机在单级入轨任务中的发展前景,为设计组合循环发动机以及进行空天往返任务规划提供参考。本文将RBCC按照构型特点进行归类并举例介绍,概述了发动机-机身一体化设计情况,并简要介绍了RBCC动力飞行器的任务规划和多目标优化方法。当前,尽管RBCC的研究面临着很多艰难的挑战,但是RBCC具有单级入轨的潜力,能够降低空天往返的成本。对RBCC发动机系统中各个子系统的研究也有利于促进其他相关学科的发展。

摘要：2019年9月20日,由中国工艺美术学会民间工艺美术专业委员会、湖南省美术家协会、湖南省文史研究馆、湖南美术出版社等单位主办的"四季花开·左汉中艺术展"在长沙美仑美术馆盛大开幕。来自中国艺术研究院、中国民间文艺家协会、中国国家画院、中国国家博物馆、清华大学、湖南师范大学、湖南工商大学、湖南省美术家协会、湖南省设计艺术家协会等单位的30余名专家学者参加了开幕式后召开的学术研讨会。

摘要：微生物制造产业的发展迫切需要进一步提高认识、设计和改造微生物细胞代谢的能力,以推动工业生物技术快速发展。随着微生物全基因组序列等高通量数据的不断积聚和生物信息学策略的持续涌现,使全局性、系统化地解析、设计、调控微生物生理代谢功能成为可能。而基于基因组序列注释和详细生化信息整合的基因组规模代谢网络模型(GSMM)构建为全局理解和理性调控微生物生理代谢功能提供了最佳平台。以下在详述GSMM的应用基础上,描述了如何构建一个高精确度的GSMM,并展望了未来的发展方向。

摘要：The creep anisotropy behavior under different stresses at 180℃ of hot-extruded AZ91−2Y magnesium alloy with pre-compression(PC)and without pre-compression(NPC)was ***,texture and mechanical properties of the alloy were examined by scanning electron microscopy(SEM),electron backscatter diffraction(EBSD),transmission electron microscopy(TEM)and tensile creep *** results revealed that the creep resistance was proportional to the volume fraction of spherical Mg_(17)Al_(12) *** dynamic precipitation of large volume fraction of lamellar Mg_(17)Al_(12) in NPC samples leads to the basaláañslip as the dominant creep mechanism,and the NPC samples have obvious *** the PC samples,dynamic precipitation of large volume fraction of spherical Mg_(17)Al_(12) has inhibitory effect on the basaláañ*** pyramidalác+añslip and twinning improve the creep anisotropy resistance significantly.

摘要：葡萄酒品质的提升是一个多因素共同作用的过程,围绕酿酒原料、酿酒酵母、浸渍工艺及陈酿方式4大关键因素展开深入探讨。酿酒原料的质量至关重要,特别是葡萄的品种和成熟度,对葡萄酒的口感和风味具有决定性影响。通过选择适宜的葡萄品种并结合精准农业技术如生物刺激剂的应用,可显著改善酿酒葡萄的理化指标,为高品质葡萄酒奠定基础。酿酒酵母的筛选与培养直接影响葡萄酒的发酵效果及风味特性。混合培养不同酵母菌株可显著增加葡萄酒质量多样性,而基因工程和代谢工程技术的应用则为改造酿酒酵母提供了新的可能。浸渍工艺的优化,特别是冷浸渍技术的开发与应用被证明能够有效提升葡萄酒中的多酚含量,改善其色泽与口感。陈酿方式的创新为葡萄酒品质提升提供了更多可能性。橡木桶陈酿已经形成了较为成熟的技术,而陶缸陈酿因其透气性和使用上的便利性正在受到越来越多的关注。将陶缸与橡木片协同使用的陈酿方式被证明能够有效提升葡萄酒的多酚含量。这些研究为葡萄酒产业提供了宝贵的理论依据和实践指导,有助于推动葡萄酒品质的持续提升。

摘要：Boundary recovery is one of the main obstacles in applying the Delaunay criterion to mesh generation. A stan- dard resolution is to add Steiner points directly at the intersection positions between missing boundaries and triangulations. We redesign the algorithm with the aid of some new concepts, data structures and operations, which make its implementation routine. Furthermore, all possible intersection cases and their solutions are presented, some of which are seldom discussed in the litera- ture. Finally, numerical results are presented to evaluate the performance of the new algorithm.

摘要：在无网格法中,离散节点之间的相互联系由节点形函数影响域的大小确定,因此形函数影响域的大小对无网格法的计算精度有着直接和重要的影响.但由于无网格形函数的形式较为复杂,目前形函数影响域大小的选择仍然缺乏系统的理论依据,通常在实际计算中仍凭借经验进行选取,难以保证计算精度.卷积神经网络是一类机器学习方法,其感受野与无网格形函数的影响域具有内在相似性,因此在形函数影响域选择方面有很好的适用性.基于该特性,论文通过引入卷积神经网络对无网格形函数的影响域进行了优化选择.首先,针对感受野和影响域的匹配关系,分析了卷积神经网络的结构设计和超参数选择,提出了一种无网格法内禀卷积神经网络结构的设计方法;然后依托该网络结构设计方法,建立了对无网格形函数影响域和数值解分别优化或同时优化的卷积神经网络.文中通过算例系统验证了所提无网格法内禀卷积神经网络对形函数影响域选择和计算结果的优化效应.