On fair designs of cross-chain exchange for cryptocurrencies via Monte Carlo simulation

Cryptocurrency is one of the earliest and the most successful applications of blockchain, and it utilizes the distributed ledger, which is a commonly used technique in blockchain, to make a decentralized transaction within the blockchain of a cryptocurrency. However, how to make a decentralized transaction of cryptocurrencies between parties on different blockchains, that is, the cross-chain exchange, is not well-studied. In this paper, we develop a new method to make cross-chain exchanges based on the classical atomic swap. We first study the optionality embedded into the atomic swap and propose to add a premium into the atomic swap, and then design a new procedure with the premium to guarantee the fairness of the cross-chain exchange. We also provide an algorithm based on the least-squares Monte Carlo method to estimate the premium and analyze the convergence of the algorithm. Moreover, we study the cross-chain exchange with margin trading. We propose an adapted exchange procedure to make a fair cross-chain exchange and an algorithm to estimate the fair premium under the margin trading. Numerical experiments are provided to show the effectiveness of the algorithms.     

Performances and direct writing of CL-20 based ultraviolet curing explosive ink

A new type of explosive ink formulation that can be quickly cured was prepared with unsaturated polyester as binder,styrene as active monomer,2,4,6-trimethylbenzoyl-diphenylphosphine oxide as photoinitiator,and hexanitrohexaazaisowurtzitane (CL-20) as the main explosive.Then the explosive ink direct writing technology was used to charge the micro-sized energetic devices,the curing mechanism of the explosive ink was discussed,and the microstructure,safety performance and explosive transfer performance of the explosive ink molded samples were tested and analyzed.Results indicate that the composite material has a fast curing molding speed,its hardness can reach 2H within 8 min.The crystal form of CL-20 in the molded sample is still ε type.The CL-20 based W-curing explosive ink formulation has good compatibility,its apparent activation energy is increased by about 3.5 kJ/mol.The composite presents a significant reduction in impact sensitivity and its characteristic drop height can reach 39.8 cm,which is about 3 times higher than the raw material.When the line width of charge is 1.0 mm,the critical thickness of the explosion can reach 0.015 mm,and the explosion velocity is 7129 m/s when the charge density is 1.612 g/cm3.     

螺旋桨梢涡卷起数值计算

通过解析公式计算得到面源和面偶的诱导速度,在面偶附近区域,用涡环代替面偶,计算得到螺旋桨的速度场,根据尾涡面必须和当地流体流速相切的原则,修正原来尾涡面的形状,逐步迭代直至尾涡形状收敛,用这种方法预报了三维水翼和螺旋桨的尾涡面的形状和梢涡卷起,与试验结果有较好的一致性。     

欠驱动关节机械臂位置控制研究

以具有欠驱动关节的水平两自由度机械臂为研究对象,研究当驱动关节达到指定位置后,以幅值和频率可调的驱动关节角速度信号为控制输入量来控制欠驱动关节的位置。用平均法对欠驱动机械臂的拉格朗日动力学模型进行了简化,并基于简化后的模型给出了闭环非线性反馈控制律。仿真结果表明,所设计的闭环非线性反馈控制率能够使任意初始位置的欠驱动关节趋近其指定位置。     

应用改进的线性预测算法构建虚拟阵的精确定向方法

为了克服传统线性预测(Linear Prediction,LP)算法在构建虚拟阵过程中存在预测误差容易累积的弊端,提出了一种能够更充分利用实阵信息量的改进LP算法来构建虚拟阵。采用实际基阵方法、传统LP虚拟阵方法和改进LP虚拟阵方法分别对假定基阵的波束性能进行计算机仿真及对湖试数据进行处理成像,研究结果表明,与传统LP方法相比,改进的LP方法能够有效地抑制波束旁瓣,进一步提高了基阵的角度分辨力和阵增益,将其运用于特定试验背景下的实际湖底目标声探测,方向分辨精度可提高75%。     

多样化军事任务异构数据集成应用方法

为实现多源异构作战数据高效融合共享,提出了改进型中间件异构数据集成框架,设计了作战数据融合运用核心组件,实现了多源异构作战数据综合应用平台,提高了各类作战数据的融合运用效率,为指挥员及时掌握战场态势,高效科学决策提供了数据支撑。     

谈液氨泄漏事故处置战术要点

工业生产中液氨一旦发生泄漏,不仅会造成人员中毒,还可能触发爆炸燃烧,从而导致更大的人员伤亡和财产损失。近年来,因液氨泄漏引发的人员伤亡事故时有发生,通过分析氨的特性和泄漏火灾事故特点,结合参与处置此类事故的经验,总结处置液氨泄漏事故的战术要点。     

浅谈军事学术期刊品牌的构建

构建军事学术期刊品牌的目的是提高军事期刊办刊质量,全面提升学术影响力,为部队打胜仗提供理论支持。构建军事学术期刊品牌应根据自身特点进行科学定位,制订切实可行的发展规划,选择适合本单位军事学术期刊的具体思路加以实施,全面提高军事学术期刊的品牌形象和质量。     

当代大学生消费行为调查与分析研究

大学生是社会消费群体中的重要组成部分,随着社会发展,大学生的消费行为呈现多元化和复杂性特征,其消费意识、消费观念、消费方式已经发生明显的变化。通过对现代大学生消费行为的调查分析,了解大学生消费行为的现状、特点及其原因,并提出了大学生合理消费行为的建议与对策。