摘要：移动自组网中,网络的拓扑结构可以通过调节每个节点的传输功率加以控制,拓扑控制的基本目标是设计基于功率优化的算法,既能维护网络的连通性,又能降低节点的传输功率,延长节点的生存时间,达到优化网络性能的目的.在GG图的基础上,提出了一种基于能量效率的拓扑控制算法VCGG(a varying-cone distributed topology-control algorithm on Gabriel graph).算法采用可变扇区的思想,运用优先删除最远节点的方法(FDFN)选择逻辑邻居节点,建立了一个度有界、平面、干扰小的t-支撑图.模拟结果显示:VCGG算法与SΘGG,SYaoGG等算法相比,减少了节点的传输功率,降低了通信邻居节点的数目,减轻了邻居节点的干扰,提高了能量的使用效率.

摘要：The financial management product with non-guaranteed principal by commercial banks has been developed rapidly in recent years,however,its major executive mode( fund-pool) has faced the dilemma of maturity mismatch,'borrowing short and investing long'and using new issuance to repay maturing products; its legal system also exposes holes such as the cognizance of its legal nature is limited; asset custody system is weak and it is hard to promote the supervisory and balance function of custodians; and the assessment of risk tolerance of financial investors become mere formality,which is easy to evoke moral ***, the corresponding legal solutions are as follow: allowing commercial banks to operate financial management products with nonguaranteed principal in trust mode and using the characteristic of the trust system to protect the investors of financial management products to the maximum degree; constituting independent custodian system in financial management products with non-guaranteed principal by commercial banks; and constituting comprehensive and perfect investor protection system in financial management products with non-guaranteed principal by commercial banks.

摘要：[Objective] This study aimed to establish a multiplex PCR system for de- tecting transgenic ingredients from Citrus. [Method] Based on the pBI121 plasmid sequences published in GenBank and actin gene sequence of Citrus, the primers specific to CaMV35S promoter, NOS promoter, NOS terminator and actin gene were designed, to establish a multiple PCR system which could detect four types of sequences. In addition, orthogonal tests were performed to determine the optimal concentrations of all the components in PCR reaction system, as well as the optimal PCR cycle parameters. [Result] The optimal PCR reaction system should contain 2.5μl of 10xPCR buffer, 2.0μl of MgCI2 （25 mmol/L）, 2.0 μl of dNTP mixture （2.5 mmol/L of each dNTP）, 1.0 μl of actin gene primers （10μmol/L）, 1.0μl of 35S promoter primers （10 μmol/L）, 1.5 μl of NOS promoter primers （10 μmol/L） and 0.5 μl of NOS terminator primers （10μmol/L）, 0.1 μg of template DNA, 1.25 U of Taq DNA polymerase; ddH20 was added to the total reaction system of 25μl. The PCR reaction program consisted of pre-denaturing at 94℃ for 5 min; 31 cycles of denaturing at 94℃ for 30 s, annealing at 64.1℃ for 45 s and extension at 72℃ for 50 s; final extension at 72℃ for 10 min. The reaction system optimized with the orthogonal tests could detect as less as 0.1% transgenic component in the tested samples. [Conclusion] The MPCR detection system established in this study can meet the requirements in theory for detecting the genetically modified ingredients in Citrus or the deep-processed products.

摘要：The global outbreak of coronavirus disease 19(COVID-19),caused by severe acute respiratory syndrome coronavirus 2(SARS-Co V-2),has raised significant global *** a rapid,efficient,sensitive,and accurate point-of-care detection method is imperative for curbing SARS-Co V-2 ***,we screened a sequence,designed a set of highly sensitive loopmediated isothermal amplification primers(LAMP)and g RNA,and developed a user-friendly detection platform combining CRISPRCas12a and RT-LAMP technology to specifically detect SARS-Co V-2 and its 5 *** analysis and Cas12a-g RNA identification ensured sequence specificity,allowing us to identify SARS-Co V-2 *** developed a method for the detection of SARSCoV-2 using these primers in combination with LAMP amplification and CRISPR-Cas12a *** method is designed to detect SARS-CoV-2(NC_045512),Alpha(B.1.1.7),Beta(B.1.351),Gamma(P.1),Delta(B.1.617.2)and Omicron(B.1.1.529).Additionally,it can differentiate SARS-CoV-2 from other *** analysis can be conducted by measuring fluorescence values,while qualitative analysis can be performed by observing fluorescence color point-of-care diagnosis changes with the naked *** results suggest that a set of novel sensitive LAMP primers and g RNA have been obtained to detect the extensive variants,and the RT-LAMPCRISPR-Cas12a platform significantly facilitates point-of-care diagnosis,thereby halting the spread of SARS-Co V-2,thus contributing to COVID-19 prevention and control.

摘要：Damp-heat karst mountainous areas are unique areas in terms of socialeconomic development, resource endowment and eco-environment in China, where natural resources are abundant,unique and diverse. However, fragile eco-environment, undeveloped economy and culture, and conflict of human and environment should not be ignored. In the research, a framework of integration of resource-development and environment-protection in damp-heat karst was designed on basis of resource and environment integration, which was applied to Daxin County in Guangxi Province. Furthermore, some integration models were proposed, including integration of development of characteristic agricultural resources and protection of eco-environment, integration of development of manganese ore resources and protection of eco-environment, integration of development of tourism resources and protection of ecoenvironment and integration of development of clean energy and protection of eco-environment.

摘要：通过平面波法计算金刚石结构光子晶体的禁带特征,得出:当RA=0.16时,禁带宽度最大;当晶格常数a=8.5mm时,对应的最大禁带宽度为3.5GHz,对应的禁带范围为15.3～18.7GHz.利用CAD软件设计了在x,y,z三个方向上的周期数分别为2,4,6的金刚石结构的光子晶体模型,并采用立体印刷技术制备出了17.4mm×36.54mm× 54.32mm的三维微波金刚石光子晶体.最终通过HP网络测试仪对样品的禁带特征进行测试,结果表明;在晶体的＜100》方向上存在频率为14.7～18.5GHz的光子禁带,这与理论值相一致.当电磁波频率为17GHz时,对应的衰减率为-30dB.

摘要：准二维钙钛矿表现出独特的光物理性质,这使它们成为激光技术潜在进步的优秀候选材料.高性能纳秒脉冲激光和放大自发发射(ASE)是实现连续波抽运光电泵浦激光器的关键工艺.然而,在纳秒脉冲激光泵浦下发展准二维钙钛矿ASE或激光仍然存在一些困难,包括表面缺陷浓度高、俄歇复合和能量传递效率低.本文通过无添加剂的Cs^(+)阳离子掺杂策略,可以很好地控制准二维钙钛矿膜的形貌和相分布,从而解决了低n相导致的能量传递途径不足的问题.本文通过快速的能量传递过程揭示了增益性质和载流子复合.基于此,掺杂适当比例Cs^(+)阳离子的PEA_(2)(FA_(0.7)Cs_(0.3))_(2)Pb_(3)Br_(10)钙钛矿膜的净增益系数比原始钙钛矿薄膜提高了近3倍,从而将纳秒激光激发下的放大自发发射阈值降低到1/3.研究结果表明,在准二维钙钛矿中掺杂Cs^(+)可为实现高性能激光器件的相位分布设计提供见解.

摘要：当无线电通信受到干扰或要求无线电静默时,在森林作战的武装队伍之间将无法进行命令和情报传递。因此,亟需一种可以代替无线电通信的通信方式用于传输重要信息。针对这一需求,提出了一种新型的隐蔽声通信方法,该方法通过模仿动物的叫声来编码通信信息,并以绣眼鸟的叫声为例,利用绣眼鸟的叫声音节和音节之间的时间间隔来编码通信信息。为了减少译码计算量并提高编码效率,设计了一种基于时频特征的音节分组方法。同时,采用多种策略使得编码后的通信脉冲序列与真实铜蓝鹟叫声尽可能相似,以提高隐蔽性能,并通过实验验证在距离不超过60 m时,通信误码率不超过2%。最后,介绍了该通信方法的模型,并分析了在实际应用中可能遇到的问题,以及解决方案和未来的发展方向。研究结果表明,本方法可实现无线电不可用情况下的信息隐蔽传递。

摘要：《医学英语学术实践》课程属于医学英语课程体系中的学术应用模块.课程设置的基本理念是在目标情景分析的基础上,以选定的核心论文文献为主线串联起科研论文阅读与写作、学术海报设计、学术会议演讲等教学模块.在教学实施过程中综合运用了体裁分析理论、任务导向教学、情景教学等,引导学生通过完成各种学术交际活动来提高学术英语的实际应用能力.

摘要：双语教学是应我国教育改革与国际教育接轨需要,对我国英文教学和专业课教学提出更高要求的产物.近5年来对于临床医学八年制双语教学课程模式改良的研究处于相对停滞状态.本研究通过问卷调查和实地采访、交谈,分别从学生、教师两个视角评估八年制双语教学现状,剖析八年制通识教育阶段课程设计和双语教学模式目前存在的问题,并提出了可能的解决方案.