鄂尔多斯盆地中央古隆起与天然气聚集

鄂尔多斯盆地中央古隆起可以划分为中部凸起剥蚀区、西翼陡坡区、东翼缓坡区、北翼平缓北倾区、南翼陡缓变化区.经历了前加里东期、加里东期、海西期、燕山期几个发育阶段.古隆起的构造发育与烃源岩热演化配置良好.其东翼靖边-志丹-富县区为 Ⅰ 类远景区;北翼定边-天池区次之;西翼陡坡区较差.主要储集层是奥陶系顶部风化淋滤带.     

氧化钇稳定立方氧化锆掺杂晶体的吸收光谱和发光光谱

用“壳熔”冷坩埚技术生长了氧化钇稳定的立方氧化锆(YSCZ)掺杂晶体,它们的杂质浓度为 CeO_2(0.01、0.3、0.5wt%)、Fe_2O_3(?)0.03wt%+CeO_2 0.01wt%、Fe_2O_3 0.03wt%+(?)CeO_2 0.03wt%、CoO(0.1、0.3wt%)、Cr_2O_3 1wt%,一个为未掺杂的 YSCZ 晶体。在 Beckman UV 5270型光谱仪上测量了室温下300～800nm 波长范围的吸收光谱,记录了空气中生长和~(60)Co 射线辐照后晶体的吸收光谱。实验结果表明掺 Ce 和 Co 晶体出现新带,这是由于 γ 射线辐照过程中 Ce~(4+)变为 Ce~(3+)、Co~(3+)变为 Co~(2+)的原因。但掺Cr 的晶体经辐照后无新带出现。本工作还测量和讨论了掺 Cr、Er 等晶体的发光光谱。     

Atomistic simulations of fatigue crack growth and the associated fatigue crack tip stress evolution in magnesium single crystals

Using Large-scale Atomic Molecular Massively Parallel Simulator (LAMMPS), a classical molecular dynamics code, atomistic simulations were performed to investigate the fatigue crack growth rate and the evolution of the associated atomic stress fields near the crack tip during fatigue crack growth in magnesium single crystals. The interatomic bonds of atoms were described using the EAM potential. The specimens with initial edge cracks were subjected to uniaxial Mode I cyclic loading. For the sake of revealing the influence of the initial cracks’ crystal orientations, three different orientations were considered. The fatigue growth rate can be expressed by da/dN = cCTOD, where the values of constant c are determined by the atomistic simulations. Notably, the values of the constant c are much larger for magnesium single crystals than for FCC single crystals and vary widely from one orientation to another. The simulation results show that the evolution of atomic stress fields was highly dependent on the crystal orientations due to anisotropy and magnesium single crystals’ HCP structure. Interestingly, the von Mises stress or normal stress around the crack tip controlled the fatigue crack growth behaviors.     

半穿甲战斗部碰靶的炸药安定性计算模型

采用应力波传播理论和能量原理，通过研究半穿甲战斗部，在碰靶时产生的应力波在靶板、弹顶和装药间的传播、反射和透射，以及装药对冲击载荷的化学响应，建立截锥头部的半穿甲战斗部碰靶装药安定性计算模型，计算结果与模拟试验结果较吻合。     

GaiaWorld: A Novel Blockchain System Based on Competitive PoS Consensus Mechanism

The birth of blockchain has promoted the development of electronic currencies such as Bitcoin and Ethereum. Blockchain builds a financial system based on cryptology instead of credit, which allows parties to complete the transaction on their own without the need for credible third-party intermediaries. So far, the application scenario of blockchain is mainly confined to the peer-to-peer electronic financial system, which obviously does not fully utilize the potential of blockchain.
In this paper, we introduce GaiaWorld, a new system for decentralized application. To solve the problem of resource waste and mismatch between nodes and computing power in traditional PoW mechanism, GaiaWorld introduces a new consensus mechanism called CPoS, which can improve productivity and liquidity of blockchain system. GaiaWorld constructs a new architecture based on forging committee and forging group systems, which can establish a decentralized, free and stable internet trust system, and can be utilized in multiple application scenarios and construct efficient and reliable content delivery systems.     

Preparation and light-to-heat conversion efficiency of paraffin/graphene aerogel shape-stable phase change materials

A kind of shape-stable phase change materials (SSPCMs) was prepared by using graphene aerogel (GA) with different pore size adsorbing molten paraffin wax via vacuum impregnation. The characteristics of SSPCMs were determined by scanning electron microscopy (SEM), X-ray diffractometer (XRD), differential scanning calorimetry (DSC) and TCi thermal conductivity analyzer. The SSPCMs possessed a high comprehensive performance: a high thermal conductivity of 1.432?W/m·K (more than 400% increase over pure paraffin), a good capacity of thermal energy storage (more than 200?J/g), a ability to light-to-heat energy storage and coating effect (encapsulation ratio is about 55%) due to the three-dimensional GA foam structure with functions of thermal conductivity and adsorptive property. In addition, an energy conversion from light to heat was realized with the SSPCMs. For different morphologies of GA, as pore size of GA decreases, SSPCMs’ thermal conductivity and solar energy usage efficiency increases and their leakage rate reduces. This means that pore size of GA can influence the properties of SSPCMs to some extent.     

Boosting Alkaline Hydrogen and Oxygen Evolution Kinetic Process of Tungsten Disulfide-Based Heterostructures by Multi-Site Engineering

Alkaline water electrolysis is an advanced technology for scalable H₂ production using surplus electricity from intermittent energy sources, but it remains challenging for non-noble electrocatalysts to split water into hydrogen and oxygen efficiently, especially for tungsten disulfide (WS₂)-based catalysts. Density functional theory calculations in combination with experimental study are used to establish a multi-site engineering strategy for developing robust WS₂-based hybrid electrocatalyst on mesoporous bimetallic nitride (Ni₃FeN) nanoarrays for bifunctional water splitting. This ingenious design endows the catalyst with numerous edge sites chemically bonded with the conductive scaffold, which are favorable for water dissociation and hydrogen adsorption. Benefiting from the synergistic advantages, the N-WS₂/Ni₃FeN hybrid exhibits exceptional bifunctional properties for hydrogen and oxygen evolution reactions (HER and OER) in base with excellent large-current durability, requiring 84 mV to afford 10 mA cm^?2 for HER, and 240 mV at 100 mA cm^?2 for OER, respectively. Assembling the catalytic materials as both the anode and cathode to construct an electrolyzer, it is actualized very good activities for overall water splitting with only 1.5 V to deliver 10 mA cm^?2, outperforming the IrO₂⁽⁺⁾//Pt^(?) coupled electrodes and many non-noble bifunctional electrocatalysts thus far. This work provides a promising avenue for designing WS₂-based heterogeneous electrocatalysts for water electrolysis.