控制性水库建设模式研究

水库梯级（尤其是控制性水库梯级）的建设在西南水电开发中具有举足轻重的地位。但控制性水库梯级一般位于河流上游，为获得需要的调节库容，要求有较高的坝，从而增加筑坝的难度，水库淹没较大，相应的投资亦较大，故经济性相对于其它类型的电站较差。为促进控制性水库梯级的建设，有必要对控制性水库的建设模式进行研究，寻求其可能的投资分摊方式。本文在合理核算上游控制性水库梯级对其下游梯级受益电站补偿调节效益的基础上，对上游控制性水库梯级建设模式进行了研究，提出了控制性水库梯级几种可能的建设投资分摊模式。     

28Cr2Mo1VA钢变速冷却转变动力学研究

用膨胀法对28Cr2Mo1VA钢测定了变速冷却过冷奥氏体转变动力学曲线,结果表明,先慢冷后快冷,珠光体、贝氏体转变滞后;反之,转变超前。并提出用图解计算法求转变点,结果与实验相符合。     

移动运营商渠道管理模式及存在问题分析

渠道作为营销体系中的重要一环，对移动运营商的发展起着举足轻重的作用。随着国内移动市场竞争的加剧，营销渠道的竞争将成为移动运营商间竞争的焦点。目前，国内两大移动运营商在渠道管理上存在诸多问题，从而影响了其市场拓展。分析了移动选营商渠道管理存在的三个较为突出的问题，并提出了可行的解决方法，从而为移动运营商的渠道管理工作提供思路。     

融合隐向量对齐和Swin Transformer的OCTA血管分割

目的 光学相干断层扫描血管造影（optical coherence tomography angiography,OCTA）是一种非侵入式的新兴技术,越来越多地应用于视网膜血管成像。与传统眼底彩照相比,OCTA技术能够显示黄斑周围的微血管信息,在视网膜血管成像邻域具有显著优势。临床实践中,医生可以通过OCTA图像观察不同层的血管结构,并通过分析血管结构的变化来判断是否存在相关疾病。大量研究表明,血管结构的任何异常变化通常都意味着存在某种眼科疾病。因此,对OCTA图像中的视网膜血管结构进行自动分割提取,对众多眼部相关疾病量化分析和临床决策具有重大意义。然而,OCTA图像存在视网膜血管结构复杂、图像整体对比度低等问题,给自动分割带来极大挑战。为此,提出了一种新颖的融合隐向量对齐和Swin Transformer的视网膜血管结构的分割方法,能够实现血管结构的精准分割。方法 以ResU-Net为主干网络,通过Swin Transformer编码器获取丰富的血管特征信息。此外,设计了一种基于隐向量的特征对齐损失函数,能够在隐空间层次对网络进行优化,提升分割性能。结果 在3个OCTA图像数据集上的...     

瓦斯地质编图在生产中的运用

通过矿井瓦斯地质编图，将井田划分为严重突出区、一般突出区、突出威胁区，按分区采取防突措施，指导了矿井的安全生产，获得了较好的社会效益和经济效益。     

Rapid growth of angle-confined large-domain graphene bicrystals

In the chemical vapor deposition growth of large-area graphene polycrystalline thin films,the coalescence of randomly oriented graphene domains results in a high density of uncertain grain boundaries (GBs).The structures and properties of various GBs are highly dependent on the misorientation angles between the graphene domains,which can significantly affect the performance of the graphene films and impede their industrial applications.Graphene bicrystals with a specific type of GB can be synthesized via the controllable growth of graphene domains with a predefined lattice orientation.Although the bicrystal has been widely investigated for traditional bulk materials,no successful synthesis strategy has been presented for growing two-dimensional graphene bicrystals.In this study, we demonstrate a simple approach for growing well-aligned large-domain graphene bicrystals with a confined tilt angle of 30° on a facilely recrystallized single-crystal Cu (100) substrate.Control of the density of the GBs with a misorientation angle of 30° was realized via the controllable rapid growth of subcentimeter graphene domains with the assistance of a cooperative catalytic surface-passivation treatment.The large-area production of graphene bicrystals consisting of the sole specific GBs with a tunable density provides a new material platform for fundamental studies and practical applications.     

近红外荧光磁性复合载药脂质体的制备及应用

拟建立以近红外荧光磁性复合脂质体(NFMSLs)为模型药物载体、盐酸多柔比星(DOX)为包封药物的药物输送系统,研究了近红外荧光磁性载药复合脂质体(DOX-NFMSLs)的制备、性质及初步应用.采用共沉淀法制备FeO4磁流体,CdTe掺杂Se制备近红外量子点CdSeTe,薄膜分散法制备DOX-NFMSLs.用DOX荧光分光光度法测定DOX-NFMSLs的包封率和体外药物释放率;用DOX-NFMSLs与HepG2肝癌细胞共孵育来进行细胞成像和细胞毒性实验.结果表明,近红外CdSeTe量子点粒径约为5nm,闪锌矿结构,发射波长824 nm.磷脂与胆固醇质量比为8∶1,药脂比为1∶20的DOX-NFMSLs平均粒径为252.9 nm,Zeta电位为-48.6 mV,理想释放药物温度为41℃,平均包封率为(74.84±0.89)％.DOX-NFMSLs对HepG2肝癌细胞有一定的抗癌效果.得到了具有良好磁响应、释药温度T=41℃、可近红外成像的载药脂质体.     

近红外荧光磁性复合载药脂质体的制备及应用

拟建立以近红外荧光磁性复合脂质体(NFMSLs)为模型药物载体、盐酸多柔比星(DOX)为包封药物的药物输送系统,研究了近红外荧光磁性载药复合脂质体(DOX-NFMSLs)的制备、性质及初步应用。采用共沉淀法制备Fe3O4磁流体,CdTe掺杂Se制备近红外量子点CdSeTe,薄膜分散法制备DOX-NFMSLs。用DOX荧光分光光度法测定DOX-NFMSLs的包封率和体外药物释放率;用DOX-NFMSLs与HepG2肝癌细胞共孵育来进行细胞成像和细胞毒性实验。结果表明,近红外CdSeTe量子点粒径约为5nm,闪锌矿结构,发射波长824nm。磷脂与胆固醇质量比为8∶1,药脂比为1∶20的DOX-NFMSLs平均粒径为252.9nm,Zeta电位为-48.6mV,理想释放药物温度为41℃,平均包封率为(74.84±0.89)%。DOX-NFMSLs对HepG2肝癌细胞有一定的抗癌效果。得到了具有良好磁响应、释药温度T=41℃、可近红外成像的载药脂质体。     

Cytokinin Confers Brown Planthopper Resistance by Elevating Jasmonic Acid Pathway in Rice

Plants have evolved a sophisticated defense system that employs various hormone pathways to defend against attacks by insect pests. Cytokinin (CK) plays an important role in plant growth and stress tolerance, but the role of CKs in plant–insect interaction remains largely unclear. Here, we report that CKs act as a positive regulator in rice resistance against brown planthopper (BPH), a devastating insect pest of rice. We found that BPH feeding promotes CK biosynthesis and signaling in rice. Exogenous application of CKs significantly increased the rice resistance to BPH. Increasing endogenous CKs by knocking out cytokinin oxidase/dehydrogenase (OsCKXs) led to enhanced resistance to BPH. Moreover, the levels of the plant hormone jasmonic acid (JA) and the expression of JA-responsive genes were elevated by CK treatment and in OsCKXs knockout plants. Furthermore, JA-deficient mutant og1 was more susceptible to BPH, and CK-induced BPH resistance was suppressed in og1. These results indicate that CK-mediated BPH resistance is JA-dependent. Our findings provide the direct evidence for the novel role of CK in promoting insect resistance, and demonstrate that CK-induced insect resistance is JA-dependent. These results provide important guidance for effective pest management strategies in the future.     

基于轻量化SSD的菜品识别

为了能够在移动设备等计算力弱的平台部署菜品识别系统,帮助人们了解菜品信息,对传统目标检测模型SSD做轻量化改进,提高了检测准确率和检测速度.首先使用MobileNetV2代替SSD模型的VGG-16,减少模型体积,提升运行速度;使用注意力机制和混洗通道算法,设计新的注意力逆残差块,增强特征提取能力;优化IOU计算方式,对回归定位损失函数做改变,加快模型的收敛;最后在自建的中餐菜品数据集Chinesefood上进行训练.实验表明,本文提出的Att_Mobilenetv2_SS-DLite轻量型目标检测模型相比SSD和其它目标检测模型效果更佳.