毛泽东与新疆自治区的建立

通过和平解放建立的新疆,百废待兴,民族问题复杂,民族自决已不适应中国社会的发展。毛泽东与党中央不断丰富和完善民族区域自治的理论,适时地运用内蒙古民族区域自治的经验,全面了解与把握新疆情况,提出“慎重稳进”的方针,为新疆大力培养少数民族干部,于1955年10月1日在新疆成功地建立了维吾尔民族自治区,加强了各民族的团结与繁荣。     

组合简化方法获取正庚烷燃烧框架机理

本文对包含561物种的正庚烷燃烧详细机理进行了框架简化,获得了仅包含78物种的框架机理。简化过程中依次采用直接关系图法（DRG）进行初步简化,反应路径通量分析法（PFA）进行二次简化,近似轨迹优化算法（ATOA）进行最后深度简化。三步简化后获得的框架机理包含的物种数分别为240,139,78。对78物种框架的广泛验证表明：该机理能在详细机理适用的目标参数范围内重现详细机理在点火延迟时间、完全搅拌反应模拟中的宏观特性及物种浓度分布结果。该机理有助于正庚烷燃烧主要反应通道的认识及优化,经进一步消除刚性后可用于工程模拟。正庚烷燃烧机理框架简化的结果也表明,DRG-PFA-ATOA组合方法具有复杂燃料燃烧机理深度简化的潜力,值得应用和改进。     

Geographical routing and participant collaboration model based communication mechanism of WSAN

The communication mechanism of wireless sensor and actor network (WSAN) was studied.Firstly,a proactive location management mechanism based on the update messages sent by mobile actors to sensors and the actors’ scope limited by Voronoi diagram was proposed.Thus,sensors predicted the movement of actors using Kalman filtering of the previously received updates.Then,an optimal energy-aware forwarding rule based on geographical routing was presented for sensor-actor communication,and the delay of the data delivery process was controlled using the power control and the network congestion was dealed with by forcing multiple actors to share the traffic generated in the event area.Finally,based on the characteristics of multiple concurrent events,a model for actor-actor coordination was proposed to coordinate their movements in order to optimally accomplish the tasks.Performance simulation results show that the proposed cooperative communication mechanism for WSAN can effectively reduce end-to-end delays,energy consumption and percentage of packet drops.     

升钟湖夏季水和沉积物中磷形态分布特征

为探究升钟湖水和沉积物中磷污染情况,于2019年8月(夏季),采集了升钟湖湖区15个样点的水样和沉积物样品,测定了升钟湖表层水、间隙水及沉积物的磷形态,并分析各种形态磷之间的相关性。结果表明:①升钟湖表层水总磷含量介于0.033～0.085 mg/L,各形态的磷含量由高到低依次为DTP(61.93%)、DOP(40.00%)、PP(38.07%)和DIP(21.93%);②间隙水的总磷含量介于3.49～7.57 mg/L,是水体磷的“源”,正磷酸盐仅占总磷的1.9%;③沉积物总磷含量介于299.04～1 138.69 mg/kg,Psenner法连续分级提取出表层沉积物共有5种形态的磷,各形态磷含量由高到低依次为残渣磷(Res-P:44.78%)、金属氧化物结合态磷+有机碎屑腐殖酸磷(NaOH-P:22.92%)、钙结合态磷(HCl-P:14.82%)、可还原态磷(BD-P:13.39%)和弱吸附态磷(NH₄Cl-P:4.09%),各形态磷含量均表现一定的空间分布差异,其中,总磷含量整体为西北部高于东南部;④相关性分析结果显示,沉积物中磷的释放主要通过BD-P、NaOH-P及NH₄Cl-P进行,间隙水正磷酸盐(PO^3-₄-P)与水体各形态的磷之间均无显著的相关性(P>0.05),升钟湖沉积物磷在夏季时释放潜力较低。研究成果对于管理升钟湖的政策实施及其资源的可持续利用可提供参考。     

Honeycomb supported Co3O4/CeO2 catalyst for CO/CH4 emissions abatement: Effect of low Pd–Pt content on the catalytic activity

A structured Co₃O₄–CeO₂ composite oxide, containing 30% by weight of Co₃O_4, has been prepared over a cordieritic honeycomb support. The bimetallic, Pd–Pt catalyst has been obtained by impregnation of the supported Co₃O₄–CeO₂ with Pd and Pt precursors in order to obtain a total metal loading of 50 g/ft³.CO, CH₄ combined oxidation tests were performed over the catalyzed monoliths in realistic conditions, namely GHSV = 100,000 h⁻¹ and reaction feed close to emission from bi-fuel vehicles. The Pd–Pt un-promoted Co₃O₄–CeO₂ is promising for cold-start application, showing massive CO conversion below 100 °C, in lean condition.A strong enhancement of the CH₄ oxidation activity, between 400 and 600 °C, has been observed by addition to the Co₃O₄–CeO₂ of a low amount of Pd–Pt metals.     

虚拟现实技术在数字化校园中的应用

继多媒体、计算机网络之后,虚拟现实技术成为在教育领域内最具有应用前景的技术。随着该技术的不断发展,它在数字化校园的建设与应用中将发挥其特有的优势。本文将从虚拟现实技术的概念及特点出发,进一步探讨虚拟现实技术在数字化校园中的具体应用。     

缺失对中学英语教学的影响及对策

在概述缺失理论的基础上，提出两种缺失类型：文化缺失与语言缺失。同时，通过对西华师范大学超悦外语培训中心的一个班的初中学生进行课堂观察、采访和语言测试验证了这两种缺失的存在，提出了解决英语教学中缺失问题的办法。     

Alternate and random (co)polymers composed of anthracene and chloromethylstyrene units through controlled radical ring-opening polymerization: Synthesis,post-functionalization,and optical properties

A cyclic monomer containing the chloromethyl unit 10-methylene-9,10-dihydroanthryl-9-spiro(4′-chloromethylphenyl)cyclopropane (MDCMS) was polymerized using a controlled radical ring-opening polymerization via a reversible addition-fragmentation chain transfer (RAFT) process to afford a nonconjugated alternate polymer composed of anthracene and chloromethylstyrene (CMS) units. Well-defined random copolymers were obtained through the ring-opening RAFT copolymerization. Various functional groups were incorporated into the alternate polymer. The alternate polymer containing imidazole rings exhibited fluorescence quenching as a result of charge transfer. Fluorescence resonance energy transfer (FRET) was observed in the alternate polymers containing naphthalene and thiophene rings. The random copolymers obtained by copolymerization followed by post-functionalizations exhibited characteristic optoelectronic properties that differed from those of the alternate polymers.     

α-MnO_2纳米针的电容性能

通过简单的水热法合成了α-MnO2纳米针,将其用作超级电容器电极材料,通过循环伏安和恒电流充放电测试手段对α-MnO2纳米针电极进行分析。结果表明,以1mol·L-1 Na2SO4为电解液,电极在-0.6~0.6V的电压范围内具有良好的法拉第电容特性;在电流密度为0.01A·g-1时,电极的比电容最高达56.7F·g-1,且500次循环后,比电容保持率为82%,表明其具有良好的循环性能。     

FexOy@C负载Pt催化氯代硝基化合物加氢反应研究

以九水合硝酸铁为铁源,葡萄糖为炭源,通过水热法制备了FexOy@C复合材料。以该材料为载体,采用浸渍法制备了FexOy@C负载Pt催化剂,用于硝基化合物加氢制备相应苯胺。采用XRD和TEM对催化剂进行表征并探讨了催化剂的加入量、有机溶剂、混合溶剂体积比等因素对对氯硝基苯加氢制备对氯苯胺的影响。实验证明,该催化剂稳定性高,催化剂循环利用6次以后,其加氢活性仍可以达到100%,选择性可达99%以上。另外,该催化剂对其它硝基化合物也显示了较好的催化性能。