数字经济、人力资本流动与企业自主创新——基于中国创新调查企业的证据

本文选取2011—2014年全国创新调查企业数据,基于人力资本流动视角,考察了数字经济对制造业企业自主创新的影响。研究发现,数字经济发展能够有效推动企业自主创新。其中,数字经济通过引发人力资本流动,提升了硕士及以上学历员工、技术员工在企业内部的占比,是推动企业自主创新的重要途径,但这种机制可能会强化中国“西低东高”的区域创新格局,并进一步拉大制造业内部创新差距,形成以“熊彼特效应”占优为主导的产业结构。此外,数字经济发展对企业自主创新的影响在处于不同市场化水平和政务化水平的分位区间内表现出显著差异性。

Power Line Communications Networking Method Based on Hybrid Ant Colony and Genetic Algorithm

When solving the routing problem with traditional ant colony algorithm, there is scarce in initialize pheromone and a slow convergence and stagnation for the complex network topology and the time-varying characteristics of channel in power line carrier communication of low voltage distribution grid. The algorithm is easy to fall into premature and local optimization. Proposed an automatic network algorithm based on improved transmission delay and the load factor as the evaluation factors. With the requirements of QoS, a logical topology of power line communication network is established. By the experiment of MATLAB simulation, verify that the improved Dynamic hybrid ant colony genetic algorithm (DH_ACGA) algorithm has improved the communication performance, which solved the QoS routing problems of power communication to some extent.

震损情景下人员疏散可视化模拟

地震发生时,其引发的下落碎片会影响人员疏散速度甚至造成人员伤亡,但现有的研究通常未考虑地震诱发的下落碎片对人员逃生的影响。因此,综合考虑地震作用下人员恐慌心理和下落碎片覆盖率等因素,对传统社会力模型的参数进行修正,并对云南大学力行楼进行人员疏散可视化模拟,提出一种“先避难,后疏散”的疏散方案。模拟结果表明:在考虑这些因素的情况下,其结果更加符合现实中地震场景的人员疏散活动,所提疏散方案可以为灾害疏散演习和疏散路径提供一定的指导和帮助。

基于多尺度模型的单层网壳非线性屈曲分析

为同时模拟细观节点的局部变形和宏观结构的整体稳定性,通过对全梁一致单元模型的屈曲分析得出力学响应集中的重点区域,对该区域进行精细化建模,采用壳单元离散,宏观结构采用梁单元离散。建立了基于多点约束法的多尺度模型,并对多尺度模型及全梁单元模型进行了模态分析、考虑初始缺陷的双重非线性屈曲分析。对比结果可知:基于多点约束法的多尺度模型不会改变结构的频率、周期等固有特性,但因刚度分布的改变会导致振型变化;多尺度模型的稳定临界荷载相比一致单元模型有不同程度的降低。研究表明:多尺度模型能较为精准地模拟出细观节点的受力和变形,更贴近于实际工程的同时,在宏观层面的分析上也不失可信度。

多重他者:太平天國戰争時期的身份政治

在太平天國戰争(1851—1864)期間及其結束後,"他者"這一概念被用來煽動與表述暴力,並且在這一過程中獲得了多種意義。本文集中於十九世紀與太平天國相關的話語與表述,來探討"他者"這一概念所藴藏的政治、道德以及文化内涵。首先,通過討論太平天國和清政府的政治宣傳,作者探究這兩個敵對政權如何各自構建其政治敵人。對於太平天國的身份建設而言,宗教與政治敵人的確立尤爲重要。其次,作者關注介於現實與想像之間的筆記小説中處於政治與社會邊緣的人物。這些人物穿越政治邊界,也因此在太平天國與清政府話語中所規定的"我們"與"他者"之外形成了"第三類别"。這些短篇故事中的作者對這些邊緣角色做出道德評價,因而將他們置於另一種與"他者"相關的敘事規範之中。最後,在奇幻與想像的疆域裏,企圖建構與調整政治與道德"他者"的努力被徹底質疑。總體而言,本文以在太平天國戰争之中及其結束後所産生的文學與文化爲對象,探討"他者"這一概念的多義性與有效性。

A Two-color Single-molecule Sequencing Platform and Its Clinical Applications

DNA sequencers have become increasingly important research and diagnostic tools over the past 20 years.In this study,we developed a single-molecule desktop sequencer,GenoCare 1600(GenoCare),which utilizes amplification-free library preparation and two-color sequencing-by-synthesis chemistry,making it more user-friendly compared with previous single-molecule sequencing platforms for clinical use.Using the GenoCare platform,we sequenced an Escherichia coli standard sample and achieved a consensus accuracy exceeding 99.99%.We also evaluated the sequencing performance of this platform in microbial mixtures and coronavirus disease 2019(COVID-19)samples from throat swabs.Our findings indicate that the GenoCare platform allows for microbial quantitation,sensitive identification of the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)virus,and accurate detection of virus mutations,as confirmed by Sanger sequencing,demonstrating its remarkable potential in clinical application.

The suppression of cervical cancer ferroptosis by macrophages:The attenuation of ALOX15 in cancer cells by macrophages-derived exosomes

Induction of cancer cell ferroptosis has been proposed as a potential treatment in several cancer types.Tumor-associated macrophages(TAMs)play a key role in promoting tumor malignant progression and therapy resistance.However,the roles and mechanisms of TAMs in regulating tumor ferroptosis is still unexplored and remains enigmatic.This study shows ferroptosis inducers has shown therapeutic outcomes in cervical cancer in vitro and in vivo.TAMs have been found to suppress cervical cancer cells ferroptosis.Mechanistically,macrophage-derived miRNA-660-5p packaged into exosomes are transported into cancer cells.In cancer cells,miRNA-660-5p attenuates ALOX15 expression to inhibit ferroptosis.Moreover,the upregulation of miRNA-660-5p in macrophages depends on autocrine IL4/IL13-activated STAT6 pathway.Importantly,in clinical cervical cancer cases,ALOX15 is negatively associated with macrophages infiltration,which also raises the possibility that macrophages reduce ALOX15 levels in cervical cancer.Moreover,both univariate and multivariate Cox analyses show ALOX15 expression is independent prognostic factor and positively associated with good prognosis in cervical cancer.Altogether,this study reveals the potential utility of targeting TAMs in ferroptosis-based treatment and ALOX15 as prognosis indicators for cervical cancer.

Bending performance analysis on YBCO cable with high flexibility

In order to utilize high‐temperature superconducting Yttrium Barium Copper Oxide(YBCO)tapes to develop superconducting cables for high magnet field applications,it is critical to ensure the stable operation of the YBCO cable under challenging mechanical and thermal conditions.A new type of cable featuring the winding of YBCO and copper tapes around a spiral stainless steel tube has been proposed to increase flexibility and cooling.Experiments are performed to confirm that its critical current varies with the bending diameter.The cables wound with nine YBCO tapes in three layers show a critical current degradation of less than 5%for a bending diameter of 30 mm.The performance of the cable degrades as the number of wound layers increases.The critical current degradation of cable specimens wound from 15 tapes in five layers reached approximately 12%for a bending diameter of 30 mm.In addition,when compared to traditional CORC cable specimens,the developed cable specimens show better‐bending flexibility and achieve a lower critical bending diameter.The finite element models show that the higher elasticity coefficient and lower plasticity of the stainless steel spiral tube results in a lower strain on the YBCO tapes of the HFRC cable than that of the CORC cable,and the maximum strain on the YBCO tapes of the HFRC cable was only about 10%of that of the CORC cable.Therefore,it is less likely that the YBCO tape in this type of cable will reach the irreversible strain limit during bending,resulting in a degradation in current carrying performance.Furthermore,the cooling efficiency can be improved by flowing the cooling medium inside the central core,which can significantly improve its thermal stability.These advantages indicate the possibility of using it in future high‐field magnets with high current carrying capacity at fields greater than 15 T.

Optimization of Wind Farm Collection Line Structure under Symmetrical Grid Fault

A power-transmission collection line is connected to each wind turbine of a wind farm and then connected to the incoming switchgear at the low-voltage side of the booster station at a certain distance.Therefore,the grouping of the wind turbines in the wind farm determines the layout of the lines and affects the line impedance.The line structure and composition of the wind farm are analyzed,and the relationship between the impedance of the collection line and reactive power generated by the wind turbine at low-voltage ride through is derived.We conclude that the smaller the equivalent impedance of the wind farm collection line structure is,the greater the reactive power at the wind farm collection line point is.In addition,the economic aspect of the collection line needs to be considered in the design.The economic aspect and impedance values have contrasting characteristics.Therefore,according to the condition of minimum impedance and optimized economic aspect,an optimization model of a wind-farm collector-circuit structure is proposed.The optimal structure of the wind farm collector circuit is calculated using the Monte Carlo method,and the theoretical analysis is verified by simulation.

AC loss and contact resistance in highly flexible rebco cable for fusion applications

High Temperature Superconductor(HTS)materials can operate at higher magnetic fields up to 20 T with high critical current and higher operating temperature,compared to low temperature superconductors(LTS).A Highly Flexible REBCO Cable(HFRC)is introduced at the Institute of Plasma Physics,Chinese Academy of Sciences(ASIPP);a cabling method that is suitable for REBCO HTS tape having anisotropic material properties in its thin REBCO layer.This type of HTS superconducting cable shows high potential for applications in nuclear fusion.The alternating currents and magnetic fields in tokamak type of fusion magnets,cause AC power losses in such cables,which can provoke instability of the conductor by induced currents and increase the temperature.As a first step in characterizing the electromagnetic(EM)performance of an HFRC cable,the AC loss and contact resistance of the HFRC prototype cable were measured at the University of Twente.The measurements were done in liquid helium(4.2 K)with AC magnetic fields,applied perpendicular to the cable's long axis.The AC loss was measured simultaneously by a calibrated gas flow calorimeter utilizing the helium boil-off method,and by the magnetization method using pick-up coils.For the applied test conditions,no coupling loss could be distinguished as a part of the overall AC loss.It is suggested that this might be explained by the shielding of the conductor interior from the applied magnetic field by the outer tape layer due to the high critical current density of the REBCO tape,leading to a high penetration field.

Authenticating the Renewed Heavenly Vision： The Taiping Heavenly Chronicle （Taiping tianri）

The publication of The Tat＇ping Heavenly Chronicle （Taiping tianr） in 1862 marks a critical moment in the development of the Taiping propaganda machine. Printed with copper plate printing technology that evinces imperial authority, this text is the only official history written by the Taipings in their quest to institute an overarching narrative of the movement. A systematic description of the origin and nature of the Taiping movement, The Taiping Heavenly Chronicle aims to establish Hong Xiuquan as the sole religious and political leader after the internecine Tianjing Incident （1856）, which radically restructured the Taiping leadership. Using imagery, popular literary tropes, and narrative devices, this text incorporates the heterogeneous elements found in the Christian-inspired Taiping discourse to rewrite thousands of years of Chinese history.

Performance of highly flexible sub-cable for REBCO Cable-In-Conduit conductor at 5.8 T applied field

Due to the high current capability and excellent flexibility,High Flexible REBCO Cables(HFRC)have emerged as an important candidate for composite high‐temperature superconducting conductors.The REBCO six around one Cable‐In‐Conduit Conductor(CICC)concept has been designed for application in the Central Solenoid(CS)coil of the China Fusion Engineering Test Reactor.In the application of fusion devices,the performance of CICC under electromagnetic(EM)loading and thermal stress is very important for reliable and economic operation.Therefore,a 1.22 m long sub‐cable with HFRC design for CICC was manufactured and tested at 4.2 K in a background magnetic field up to 5.8 T.The aim is to investigate the stability of the current‐carrying properties of the HFRC cable under electromagnetic and thermal cyclic loading.The test results show that the critical current(I_(c))of the HFRC cable reached 17.3 kA in a background magnetic field of 5.8 T at 4.2 K.Furthermore,no performance degradation was observed after 24 cycles of 80 kN/m peak load with a background field of 5.8 T and 8 warm‐up‐cool‐down cycles between 77 K and room temperature.The test results provide a good basis for the development of full‐size conductors in future magnet applications.