摘要：Advanced geological prediction is a crucial means to ensure safety and efficiency in tunnel ***,diff erent advanced geological forecasting methods have their own limitations,resulting in poor detection *** multiple methods to carry out a comprehensive evaluation can eff ectively improve the accuracy of advanced geological prediction *** this study,geological information is combined with the detection results of geophysical methods,including transient electromagnetic,induced polarization,and tunnel seismic prediction,to establish a comprehensive analysis method of adverse ***,the possible main adverse geological problems are determined according to the geological ***,various physical parameters of the rock mass in front of the tunnel face can then be derived on the basis of multisource geophysical ***,based on the analysis results of geological information,the multisource data fusion algorithm is used to determine the type,location,and scale of adverse *** advanced geological prediction results that can provide eff ective guidance for tunnel construction can then be obtained.

摘要：层板胶合木的制作流程决定了其材料性能与组胚粘结的层板木材的力学性能有着密切联系。基于木材材性试验,以樟子松为研究对象,建立了便于工程应用的木材本构模型。在弹性阶段,将木材应力-应变关系按正交各向异性及横观各向同性建模;选择Yamada-Sun强度准则及简化的Hashin强度准则作为木材屈服的判定依据;以正则化假设和一致性条件描述木材塑性发展的流动法则,采用弹塑性回退映射算法,将应力点约束在屈服面上;通过引入连续损伤因子,对应力折减模拟木材在拉、剪作用下发生脆性破坏;采用Ziegler随动硬化模型,控制屈服面的转移实现木材受压屈服后的应变硬化。编写用户材料子程序将木材本构模型嵌入ABAQUS中,并开展了胶合木梁柱节点试验与精细化有限元数值分析,试验结果与模拟结果吻合良好。分析结果表明:清材小试件材性试验和胶合木梁柱节点转动试验有限元模型可以有效地描述木材受压硬化、拉剪损伤演化,及节点受力非线性行为,验证了该文建立的木材本构模型的有效性。

摘要：针对研究区资料特点,开展了大面积连片叠前时间偏移技术研究:提高了叠前信噪比;叠前一致性处理,开发了时频空间域振幅调整、振幅归一化、子波处理及空变反褶积等技术;提高了成像质量和资料的横向分辨率。通过研究,实现了13个区块资料的无缝拼接,在4个重点区块发现和落实有利圈闭25个,面积301.6 km2,设计和部署探井17口。

摘要：利用1990−2020年渭北地区23个区县国家气象观测站气象数据、春玉米产量和生育期资料,选择干旱对春玉米产量有明显影响的特定生育期建立干旱指数与减产率关系模型,在此基础上设计渭北地区春玉米干旱天气指数保险产品并开展定价研究,利用干旱危险性评估结果修正保险费率以降低基差风险。结果表明:(1)渭北地区春玉米需水关键期为出苗−乳熟期,该时期干旱指数(I)与减产率(D)呈显著线性关系D=0.383I−3.959(P<0.05)。(2)渭北地区春玉米出苗−乳熟期降水量由西北向东南递减,干旱危险性由西北向东南递增,东南部干旱危险性高于西北部。(3)基于干旱减产率模型和实际保险条例,以干旱指数40%作为赔付触发值,确定了不同干旱天气指数赔付标准,基于干旱危险性评估结果修正后渭北各区县春玉米干旱天气指数保险费率在6.9%~8.9%,保费为每公顷375~480元。本研究结果可为渭北春玉米天气指数保险产品设计、定价和有效降低基差风险提供科学参考依据。

摘要：针对现有检测方法缺乏数据连续性和完整性的建模能力、难以提取API调用序列的全局特征,且对API行为语义表示抽取单一等问题,提出一种基于变分自编码器与API行为特征抽取的恶意软件检测方法。通过词嵌入将调用函数表示为语义稠密向量;基于变分自编码器架构,学习数据的潜在状态表示,完成对恶意软件全局特征和模式的提取;采用多层卷积神经网络,抽取不同粒度调用子序列的行为语义特征,同时统计调用频率,获取API使用权重信息;综合上述特征进行恶意软件检测。实验结果表明,该方法在阿里云数据集上达到了97.81%的良/恶性检测精度和93.74%的多分类精度,验证了方法的有效性。

摘要：研究由单一制造商与单一零售商组成的供应链系统中的动态合作广告策略.制造商作为渠道的领导者设计动态广告支持计划优化和协调自身以及追随者零售商的广告策略.双方都可做长期和短期广告,制造商为零售商的2种类型的广告支付一定比例的成本.用Stackelberg微分对策模型描述制造商与零售商的动态广告策略,并根据动态规划原理求出反馈Stackelberg均衡解.结果显示,制造商对零售商的广告支持类型取决于双方的边际利润.在合作广告计划中双方的均衡广告策略中,制造商主要做长期广告以构建品牌商誉,零售商在制造商的支持下主要做短期广告以刺激销售.合作广告是供应链中的一种协调机制,可以提高零售商对制造商的战略跟随意愿.

摘要：针对当前高等教育工科专业应用型人才培养需求,依托中国石油大学(华东)通信工程专业产教融合办学定位和通信工程行业特点,结合“工程概论”课程教学目标,构建了“需求引领、学生中心、成果导向、双元主导、线上线下结合”的产教融合教学模式。在产教融合教学目标设定、产与教融合点挖掘、保障机制建立等方面开展了教学改革,实施了“课前—课中—课后—考核”全过程的产教融合育人模式。实践表明,该模式在学生工程素养提升、教师工程实践教学能力提高、工程师理论水平提升、科技成果转化和服务社会等方面均取得较好成效,具有较强的示范作用和推广价值。

摘要：The use of a reconfigurable intelligent surface(RIS)in the enhancement of the rate performance is considered to involve the limitation of the RIS being a passive *** address this issue,we propose a RIS-aided amplify-and-forward(AF)relay network in this *** jointly optimizing the beamforming matrix at AF relay and the phase-shift matrices at RIS,two schemes are put forward to address a maximizing signal-to-noise ratio(SNR)***,aiming at achieving a high rate,a high-performance alternating optimization(AO)method based on Charnes–Cooper transformation and semidefinite programming(CCT-SDP)is proposed,where the optimization problem is decomposed into three subproblems solved using CCT-SDP,and rank-one solutions can be recovered using Gaussian ***,the optimization variables in the CCT-SDP method are matrices,leading to extremely high *** reduce the complexity,a low-complexity AO scheme based on Dinkelbachs transformation and successive convex approximation(DT-SCA)is proposed,where the variables are represented in vector form,and the three decoupling subproblems are solved using *** results verify that compared to three benchmarks(i.e.,a RIS-assisted AF relay network with random phase,an AF relay network without RIS,and a RIS-aided network without AF relay),the proposed CCT-SDP and DT-SCA schemes can harvest better rate ***,it is revealed that the rate of the low-complexity DT-SCA method is close to that of the CCT-SDP method.

摘要：构建缺氧-好氧-缺氧/序批式固定生物膜耦合活性污泥反应器(AOA-SBFASR),对城市污水开展中试处理研究,考察了该反应器的深度脱氮效果,并对系统中微生物种类和氮代谢通路进行分析。结果表明,AOA-SBFASR工艺可以高效去除污水中的COD、NH_(4)^(+)-N和TN,去除率分别可达到92.55%、98.75%和75.64%;在55 d内微生物群落结构发生了演替,硝化细菌、反硝化细菌和能降解难降解有机物的细菌相对丰度增加;氨氮主要通过完全硝化过程被去除,硝态氮主要通过反硝化和异化硝酸盐还原过程被去除。

摘要：As system of a serial of technologies and engineering activities, remanufacturing aims at restoring and rebuilding waste machinery through advanced technologies and industrialized measures under the direction of the product total life cycle theory. With the development of surface engineering, nano-surface engineering has been one subject of intensive studies. In addition, nano-surface engineering has become an important means for property reforming and promoting of remanufacturing parts. Many low-dimension and nano-size or nano-structure functional coatings, which can improve materials properties evidently, are deposited by new methods. In this paper, some researches about the new achievement and remanufacturing application of the nano-stmctured coatings by different nano-surface engineering technologies in our laboratory were introduced. Especially, nano-structured DLC multilayer coatings by d.c. plasma CVD, nano-composed Al2O3/Ni, SiC/Ni and Diamond/Ni coatings by brush plating, and nano-composed Al2O3/TiO2 coating by plasma spraying were introduced in detail.