基于GPS/北斗共视技术的铷钟驯服方法

在分析了现有铷钟驯服方法的基础上,提出了一种基于GPS/北斗共视技术的铷钟驯服方法,将铷钟的输出频率驯服到时间频率的最高国家基准UTC(NIM)上。试验结果表明,本文提出的方法可以有效实现对铷钟的驯服,经驯服的铷钟频率信号指标良好,能够提供铯钟量级的高精度频率标准。     

椭圆形桩井护壁爆破振动安全判据

钻爆法作为桩基开挖的主要破岩手段,所产生的爆破振动引起桩井护壁结构发生动态响应,进而影响桩井结构的稳定性。利用有限元分析软件ANSYS/LS-DYNA3D,以峰值质点振动速度和有效拉应力作为指标,模拟了椭圆形桩井护壁结构对爆破振动的动态响应。计算结果表明:不同掘井深度的椭圆形桩井护壁对不同段药量爆破振动的动态响应呈相似规律,最大质点峰值振速及峰值拉应力分布一致,均位于护壁井口端的弧形壁部分,响应强度随段药量的减小而减小;护壁结构的峰值拉应力与峰值振速呈线性关系,基于抗拉强度准则,确定了该工程条件下护壁的安全振动速度阈值为8 cm/s,现场测试验证了预设判据的合理性。     

Synthesis of 1-[(O,O-diphenyl phosphonyl)arylmethyleneamino carbonylmethyl]uracils

Recently,thederivativesofN-lpyrimidinesorN-9punnes,substitutedbyaphosphonylgroupwerefoundasanewclassofantiviralagentswithabroadspectrumofactivitiesagainstretrovirusesandDNAvirus"'.Andatthesametime,a-aminophosphonicacidsalsoexhibitvariousinterestingbiologicalactivities.Someofthemhavebeenemployedasanticancer,antibacterialandantibiotics'-'.Sowedesignedandsynthesizedthetitlecompoundsinordertosearchfornewbiologicallyactivitivesubstances.ThesyntheticrouteisshowninScheme1.Thekeyifltermediate2wasob…     

(i-Bu)2Te催化下(2E、4E)-二烯酸酯的高立体选择性合成

Ｗｉｔｔｉｇ型反应是一类具有巨大潜在应用价值的反应。它简化了制备Ｗｉｔｔｉｇ试剂的繁琐过程。在（ｉ－Ｂｕ）２Ｔｅ催化下用δ－溴代巴豆酸酯和醛采用一锅法反应高立体选择性地合成（２Ｅ．４Ｅ）－二烯酸酯是Ｗｉｔｔｉｇ型反应的又一成果。     

《义务教育化学课程标准(2022年版)》解读——核心素养、课程目标和学业质量标准的研制

结合化学课程的历史和现实需求,从多角度阐述了化学课程的全面育人价值,分析了《义务教育化学课程标准(2022年版)》中核心素养凝练的思路;提出了核心素养各要素的内涵和外延,梳理了初、高中学段2个核心素养体系之间的关系;探讨了基于核心素养的化学课程目标及化学学业质量标准体系建构的特点及应用。     

Controlled Quantum Teleportation of a One-Particle Unknown State via a Three-Particle Entangled State

A kind of three-particle entangled state is applied as quantum channel of the controlled quantum teleportation of a one-particle unknown state. The one-particle unknown state is transmitted from the sender to the recipient under the control of the supervisor. After the sender makes Bell-state measurement and the supervisor performs von Neumann measurement, the recipient carries out unitary transformation on his own particle depending on classical information from the sender and the supervisor. The teleportation cannot be completed successfully by the recipient if the supervisor does not agree to cooperate. The roles of the recipient and the supervisor may be exchanged in this scheme. The scheme is flexible and feasible because the sequence of manipulation of the sender and the supervisor may be exchanged and only simple unitary transformation is included.     

Recent Progresses on the High Performance Organic Electrochemical Transistors

Organic electrochemical transistor(OECT) with bulk current modulation capability based on the ion penetration into the organic semiconducting channel exhibits unique features, including high transconductance, low voltage and large capacitance. The high current at a low voltage, together with the compatibility with aqueous environment, makes OECT particularly suitable for bioelectronic applications, such as biological interfacing, printed logic circuitry and neuromorphic devices. However, the operation mechanism and structure-performance relationship of OECT are rather complicated and remain unclear to date. One of the critical issues is the ion penetration and transportation process. This review focuses on the research progresses of how to improve the OECT performance specifically through materials design, interfacing and morphology modulation. Different strategies of promoting the ion doping process are compared and discussed in order to optimize the device performance so that a deep understanding of the OECT operation principle could be gained.     

三维医学模型表面积和体积计算方法研究

应用MATLAB语言描述了测量任意给定的颌、颧骨区域的表面积和体积的方法,并且在临床上用实例给出了计算结果.     

从斯梯芬链到麦克斯韦妖--浅谈物理学中的思想实验

结合历史上大量著名的思想实验实例,系统阐述了思想实验在物理学研究中的独特地位、重要应用和不可替代性给出了思想实验较为准确、细致的定义对比分析了思想实验与真实实验的辩证关系以及思想实验与理论假说或者理论推演的区别与联系．     

废轮胎回转窑中试热解炭表面组分XPS分析

以X射线光电子能谱（XPS）对废轮胎回转窑中试热解炭表面组分进行实验分析,研究热解炭本体与表面的异同,热解温度、热解炭粒径的影响。与商用炭黒比较,废轮胎热解炭本体中含有更多的Zn、Si、S、Mg等杂质元素,各组分与热解温度没有大的相关性;热解炭表面在热解过程中形成了一吸附沉积层,表面层中杂元素的质量分数极低;低于500℃时,热解不完全,吸附沉积物较少。热解炭按粒径存在一定分布,粒度<0.074 mm的粉末状热解炭来自表面磨损脱落的粉末,各种杂元素的质量分数很低;Zn元素的相对质量分数随热解炭粒径的减小而减少。对热解炭进行深度剖析发现,吸附层是极薄的,表面层对本体的影响是极小的;定量分析结果表明,以C质量分数为100,则O为4～6,S、N约为1,Zn小于0.6,而商用炭黑中S约为0.3,不含N、Zn。