矿山地质绘图系统MGS的研究与开发

应用ADS(AutoCAD Development System)技术开发矿山地质绘图系统MGS.以AutoCAD为支撑环境,通过ASE/ASI(AutoCAD SQL Extension/AutoCAD SQL Program.Interface)技术实现地质工程数据库的创建与管理,开发多种地质辅助绘图工具.在数据库和辅助绘图工具支持下,MGS实现绘制地质图件、圈定矿体、计算品位和切割地质图形等多种功能.     

隐私保护的网约出行的研究综述

为高效利用交通资源,在线网约出行(ORH)服务整合车辆供给和乘客请求信息,派遣符合条件的车辆提供非巡游的出行服务。人们在享受ORH服务带来的便利时,也面临着严重的隐私泄露风险。为此,许多研究利用密码学技术设计隐私保护的ORH服务。首先,本文介绍了隐私保护的ORH服务主要面临的城市动态场景下高效计算密态行程开销、实时动态规划密态行程、安全共享不同ORH服务的运力资源等挑战。然后,回顾了欧式距离、路网距离和行驶时间三类行程开销的安全计算方法,其中,欧式距离计算效率高,但误差大,现有路网距离和行驶时长的安全计算方法多数面向静态路网场景,针对城市动态路网场景的安全计算方法有待进一步研究。分析了面向司机、乘客、ORH平台的行程规划问题的求解方法,现有研究往往仅针对司机、乘客或ORH平台的单一目标进行行程规划,事实上行程规划不但要考虑ORH平台自身收益,更要同时兼顾乘客和司机的用户体验。综述了隐私感知的行程预处理方法,单车单客模式、单车多客模式的行程安全共享方法,并总结了其不足与启示。多车单客、多车多客动态模式的行程安全共享有待进一步研究。最后,从城市动态路网下高效的密态行程开销的安全计算与比较、...     

NIPAM改性PEDOT:PSS导电聚合物的制备及在电致变色器件中的应用

以柔性疏水小分子N-异丙基丙烯酰胺（NIPAM）对聚苯乙烯磺酸盐（PSS）进行共聚改性，制备了一系列聚[(苯乙烯磺酸盐)-共-异丙基丙烯酰胺][P(SS-co-NIPAM)]，并以其为模板采用氧化聚合法与3,4-乙烯二氧噻吩（EDOT）制备了导电聚合物PEDOT:P(SS-co-NIPAM)。与PEDOT:PSS薄膜相比，NIPAM摩尔分数（以对苯乙烯磺酸钠物质的量为基准，下同）为15%时，PEDOT:P(SS-co-NIPAM)薄膜平均透光率保持在80%左右，水接触角从18.5°增至39.0°，疏水性提高，并且弯曲1000次后方阻变化量为5.71 kΩ/sq，远小于PEDOT:PSS薄膜（10.60 kΩ/sq）。以NIPAM摩尔分数为15%的PEDOT:P(SS-co-NIPAM)薄膜作为离子储存层的电致变色器件的光学对比度（ΔT）为9.83%，循环800次后ΔT仍达到9.55%，衰减量为0.28%，衰减量与PEDOT:PSS器件相当，说明NIPAM共聚改性能改善PEDOT:PSS导电聚合物的柔韧性和疏水性，以其作为离子储存层的器件可维持优异的电致变色性能。     

Well-Defined Conjugated Reticular Oligomer “Blood Cells” and Conducting Polymer “Neurons” Constructing “Muscle”-Biomimetic Electrocatalysts for Water Electrolysis

Covalent organic frameworks (COFs) provide a tunable platform for water electrolysis. However, it is difficult to perform explicitly structural characterization for COFs due to the uncontrollable polymerization via the solvothermal method, which hinders the clear-cut exploration of the COFs’ structure-performance relationship in further applications. Here, the well-defined conjugated reticular oligomers (CROs) are designed for the first time using an aqueous micellar strategy. The CROs have definite chemical structure and can be regarded as conjugated oligomers or defect-free COFs segment. Using CROs and conducting polymer, three “muscle”-biomimetic electrocatalysts are engineered for splitting water to H₂ and O₂. The self-assembled “muscle”-like structures guarantee fully exposed active sites, fast electron conduction and mass transfer (H₂O/H₂/O₂). The “muscle”-biomimetic poly(3,4-ethylenedioxythiophene) (PEDOT)/CROs-Ru exhibit superior electrochemical performance than the COFs-Ru. In particular, the mass activity and turnover frequency (TOF) value of PEDOT/CRO_OH-8-Ru are ≈95 and 38 times that of the counterpart bulk Py-COF_OH. The theoretical calculation and the experimental results demonstrate that the CROs endow the electrocatalyst with an electron-rich surface and enhance carrier mobility. The enhanced water electrolysis activity of CROs-Ru can be attributed to the Schottky heterojunction suppressing the electron backflow, which facilitates the adsorption of hydrogen protons and hydroxides.     

工艺参数对7003铝合金/AZ31镁合金板搅拌摩擦焊搭接组织及性能影响

针对7003铝合金和AZ31镁合金两种金属进行搅拌摩擦焊工艺试验，研究不同焊接速度、搅拌速度、轴肩下压量等焊接工艺参数对其搭接接头微观组织、力学性能性能、断口形貌的影响。结果表明，后退侧Hook尺寸明显大于前进侧Hook尺寸且更为曲折，搅拌区内主要由网格状的Al₁₂Mg₁₇组成，网格内部由镁基体和Al₁₂Mg₁₇共同组成，前进侧上空存在一个沿水平方向延伸的金属间化合物(intermetallic compounds,IMCs)薄层；焊缝表面随着转速的提升变得光滑，后退侧Hook尺寸明显增加；行进速度过大会导致冶金反应不充分，焊缝表面出现犁沟，搅拌区底部出现隧道；下压量增大会使接头机械互锁程度增加，当下压量、焊接速度或旋转速度增加时，有效承载面积增大，拉剪力随着搭接接头有效承载面积的增加有不同程度提升；拉剪力最大值(4.02 kN)出现在950-30-0.7参数下，断裂方式为解理脆性断裂；焊缝中心由于Al-Mg金属间化合物的生成，硬度最高为144.8HV_0.05。     

输电费的计算与分摊

输电费的计算和分摊是省级以上电力市场必须解决的重要问题之一。文中分析了国外常用 的几种输电费算法和在各国电力市场中应用的经验,并对我国在电力市场改革中应采用哪些算法 提出了建议。     

Proton Conductor Confinement Strategy for Polymer Electrolyte Membrane Assists Fuel Cell Operation in Wide-Range Temperature

Acid loss and plasticization of phosphoric acid (PA)-doped polymer electrolyte membranes are critical hampers for its actual application especially during startup/shutdown stages due to the produced water and thermal stress. To conquer these barriers, a proton conductor confinement strategy is introduced, which may trap PA molecules in the side-chain acidophilic microphase and weaken plasticizing effect caused by PA toward the polymer backbone to remain membrane tensile stress. The grafted polyphenylene oxide (PPO) is synthesized as model polymers, both molecular electrostatic potential and molecular dynamics reveal the retention mechanism between PA and side-chain of PPO as well as the aggregation state of PA. Through precisely regulating polymer side-chain structure and defined plasticization quantitative indicator, significant refinements in membrane's conductivity, durability, and single-cell performance are achieved successfully. The designed PPO membranes exhibit ultra-fast and stable proton conducting even at low proton carrier concentrations and under wide-range working temperature between 80 ^oC–180 °C as well as satisfied resistance to harsh accelerated aging test. These insights will shed light on holistic understanding of PA interactions and retention from molecular level, and provide radical approaches toward high-performance PA/PEMs design.     

基于伪虎鲸click信号的主动声呐探测信号低截获性分析

为解决现代主动声呐易暴露的问题,提出以伪虎鲸click信号作为主动声呐发射信号波形进行探测,以实现声呐的低截获性。首先通过宽带模糊函数分析了伪虎鲸click信号的分辨性能;然后通过仿真对比单双基地声呐探测模型下,伪虎鲸click信号与常规主动声呐信号的截获因子,验证了其低截获性。结果表明,伪虎鲸click信号三维宽带模糊函数呈现理想的“图钉型”,时延分辨力达到7.644×10^(-6) s,频移分辨力达到7.405 Hz,具有良好的分辨性能;伪虎鲸click信号的截获因子在−4.887~−17.6 dB之间,始终小于0 dB,且远低于常规主动声呐信号,具有优异的低截获性能。伪虎鲸click信号作为声呐发射信号可实现有效与低截获性的声呐探测。     

Rational Design and Identification of Harmine-Inspired,N-Heterocyclic DYRK1A Inhibitors Employing a Functional Genomic In Vivo Drosophila Model System**

Deregulation of dual-specificity tyrosine phosphorylation-regulated kinase 1A (DYRK1A) plays a significant role in developmental brain defects, early-onset neurodegeneration, neuronal cell loss, dementia, and several types of cancer. Herein, we report the discovery of three new classes of N-heterocyclic DYRK1A inhibitors based on the potent, yet toxic kinase inhibitors, harmine and harmol. An initial in vitro evaluation of the small molecule library assembled revealed that the core heterocyclic motifs benzofuranones, oxindoles, and pyrrolones, showed statistically significant DYRK1A inhibition. Further, the utilization of a low cost, high-throughput functional genomic in vivo model system to identify small molecule inhibitors that normalize DYRK1A overexpression phenotypes is described. This in vivo assay substantiated the in vitro results, and the resulting correspondence validates generated classes as architectural motifs that serve as potential DYRK1A inhibitors. Further expansion and analysis of these core compound structures will allow discovery of safe, more effective chemical inhibitors of DYRK1A to ameliorate phenotypes caused by DYRK1A overexpression.     

超高压加工过程中花色苷降解动力学研究

为了了解超高压加工过程中花色苷的稳定性,以蓝莓汁和模拟果汁为对象,研究两种体系在200、400和600 MPa超高压处理过程中花色苷降解动力学,并探讨花色苷在超高压加工过程中的降解机理。结果表明:在200 MPa和600 MPa超高压处理过程中蓝莓果汁花色苷含量呈现下降趋势,在600 MPa超高压处理过程中模拟果汁花色苷含量也有所减少;蓝莓果汁和模拟果汁花色苷在超高压加工中的降解符合一级反应动力学。在超高压处理过程中花色苷会发生降解,这种降解不止是酶和热造成的,压力本身也会引起花色苷降解,花色苷在超高压处理过程中的降解机理需要进一步研究。