高中英语课堂思政化的可行性研究

随着中学教育改革的进行以及课堂思政化的提出,如何利用好高中英语课堂推行素质教育,是值得英语教师深思的话题。本文主要探讨了高中英语课堂“思政化”的可行性,阐释了何为英语课堂思政化、实行高中英语课堂思政化的原因及实施建议,希望为一线英语教师提供指导,实现学科育人的任务。</jats:p

IL-8-induced L-selectin shedding regulates its binding kinetics to PSGL-1

L-selectin plays a crucial role in inflammation cascade by initiating the tethering and rolling of leukocytes on endothelium wall. While many L-selectin molecules are rapidly shed from the cell surface upon activation, the remaining membrane-anchored L-selectin may still play an important role in regulating leukocyte rolling and adhesion with different binding kinetics. Here we developed an in vitro model to activate Jurkat cells via interlukin-8 (IL-8) and quantified the two-dimensional (2D) binding kinetics, using a micropipette aspiration assay, of membrane-anchored L-selectin to P-selectin glycoprotein ligand 1 (PSGL-1) ligand coupled onto human red blood cells (RBCs). The data indicated that L-selectin shedding reduced the amount of membrane-anchored L-selectin and lowered both its reverse and forward rates. These results suggested that the rolling dynamics of activated leukocytes was determined by two opposite impacts: reducing the surface presentation would enhance the rolling but lowering the kinetic rates would decrease the rolling. This finding provides a new insight into understanding how L-selectin shedding regulates leukocyte rolling and adhesion

海面微波散射与风生波短波谱

从海面微波散射的物理机制出发，在短波平衡范围条件下，讨论了风生波短波谱形式，通过对不同波段的微波散射数据分析，建立起能适应相当宽微波波段（０．４２８－３４．４ＧＨｚ）的海面微波散射模型。文中对若干波段的微波散射系数进行了试算，并与实测资料进行了比较，结果是令人满意的

中性糖在土壤中的来源与分布特征

糖类(即碳水化合物)是土壤有机质的重要组成部分,经生物化学降解形成不同结构的单糖。土壤中的中性单糖也叫中性糖,主要包括木糖、核糖、阿拉伯糖、葡萄糖、半乳糖、甘露糖、岩藻糖和鼠李糖。其中,植物来源的糖主要为五碳糖,如木糖和阿拉伯糖;微生物来源的糖主要包括半乳糖、甘露糖、岩藻糖、鼠李糖等六碳糖。研究中常利用六碳糖和五碳糖的比例指示微生物和植物对土壤有机碳的相对贡献。中性糖是微生物重要的碳源和能量来源,在团聚体的形成过程中扮演着重要角色。该文整合了近30年土壤中性糖的研究进展,对比了提取中性糖的常用方法,分析了不同土地利用类型和不同土壤组分中中性糖的含量、来源和周转特征,综述了影响中性糖含量和分布的主要环境因素。结果表明,中性糖在耕地土壤中的绝对含量和相对含量均显著低于针叶林、阔叶林、草地和灌丛4种土地利用类型。(半乳糖+甘露糖)/(阿拉伯糖+木糖)(GM/AX)在不同土地利用间差异不显著,而(鼠李糖+岩藻糖)/(阿拉伯糖+木糖)(RF/AX)则表明草地土壤中的微生物来源的中性糖含量高于针叶林和耕地。不同密度的土壤组分中,轻质组分中中性糖的含量比重质组分高,重质组分中微生物来源的中性糖较多;就不同粒径(或团聚体)而言,黏粒(或微团聚体)中微生物来源的中性糖含量更丰富。有关影响土壤中性糖含量和分布的因素的研究,目前主要集中在人为活动(如耕种和放牧等),而有关温度、降水等自然环境因素影响的研究较少

Formal Verification of XML-RPC Protocol in ROS

XML-RPC协议是ROS节点通讯的核心调用机制,其实现的正确性关乎整个系统的顺利运行. 使用模型检测和定理证明结合的方法对ROS系统中的XML-RPC协议进行验证. 首先使用CBMC模型检测工具逐个验证协议源代码的函数,然后对模型检测不能全面验证的循环结构使用霍尔逻辑建立模型并在Isabelle /HOL定理证明器中验证. 本文的工作结合两种形式化方法的优点,既克服了定理证明人工干预过多、工作量繁杂的问题,又避免了模型检测中出现状态爆炸的问题.XML-RPC protocol is the core of the invocation mechanism in ROS system. The correctness of the protocol implementation is crucial to the ROS system Operate safely. This paper presents properties validation of XML-RPC protocol in ROS system with the method of model checking and theorem proving. Our work exploits the cooperation of Bounded model checking and theorem proving, to show the correctness of XML-RPC protocol,implemented CBMC and with respect to the loop structure that it cannot fully validated in CBMC,formalized in Isabelle /HOL. The paper has demonstrated a successful application of the linkage between theorem proving and model checking in a proof that takes advantage of the strengths of the respective proof assistants. This not only can overcome the problems occurring in the theorem proving,but also can avoid the emergence of model checking