Preliminary research on the transmission path of nssSO_4^(2-) and NO_3^- in Antarctic ice sheet

The main sources of nssSO 2- 4 and NO - 3 were summarized in this paper. By analyzing the spatial distribution features of major ions in Antarctic ice sheet and studying on the different time of the same volcanic event recorded by different ice cores from different regions in Antarctica, this paper intends to study the transmission path of nssSO 2- 4 and NO - 3. Results show that nssSO 2- 4 and NO - 3 are transmitted to the ice sheet through long distance and high altitude. The procedure of the transmission is that nssSO 2- 4 and NO - 3 are transmitted to the level between the top of troposphere and the bottom of stratosphere, then subsided to the ice sheet surface and spread to other regions.

Light-Front Hamiltonian, Path Integral and BRST Formulations of the Chern-Simons-Higgs Theory in the Broken Symmetry Phase

In the present work we study the Hamiltonian, path integral and BRST formulations of the Chern-Simons-Higgs theory in two-space one-time dimensions, in the so-called broken symmetry phase of the Higgs potential (where the phase φ(xμ) of the complex matter field Φ(xμ) carries the charge degree of freedom of the complex matter field and is akin to the Goldstone boson) on the light-front (i.e., on the hyperplanes defined by the fixed light-cone time). The theory is seen to possess a set of first-class constraints and the local vector gauge symmetry. The theory being gauge-invariant is quantized under appropriate gauge-fixing conditions. The explicit Hamiltonian and path integral quantization is achieved under the above light-cone gauges. The Heisenberg equations of motion of the system are derived for the physical degrees of freedom of the system. Finally the BRST quantization of the system is achieved under appropriate BRST gauge-fixing, where the BRST symmetry is maintained even under the BRST light-cone gauge-fixing.

Inhibition of DNA-dependent Protein Kinase Catalytic Subunit by Small Molecule Inhibitor NU7026 Sensitizes Human Leukemic K562 Cells to Benzene Metabolite-induced Apoptosis

Benzene is an established leukotoxin and leukemogen in humans. We have previously re- ported that exposure of workers to benzene and to benzene metabolite hydroquinone in cultured cells induced DNA-dependent protein kinase catalytic subunit （DNA-PKcs） to mediate the cellular response to DNA double strand break （DSB） caused by DNA-damaging metabolites. In this study, we used a new, small molecule, a selective inhibitor of DNA-PKcs, 2-（morpholin-4-yl）-benzo[h]chomen-4-one （NU7026）, as a probe to analyze the molecular events and pathways in hydroquinone-induced DNA DSB repair and apoptosis. Inhibition of DNA-PKcs by NU7026 markedly potentiated the apoptotic and growth inhibitory effects of hydroquinone in proerythroid leukemic K562 cells in a dose-dependent manner. Treatment with NU7026 did not alter the production of reactive oxygen species and oxidative stress by hydroquinone but repressed the protein level of DNA-PKcs and blocked the induction of the kinase mRNA and protein expression by hydroquinone. Moreover, hydroquinone increased the phos- phorylation of Akt to activate Akt, whereas co-treatment with NU7026 prevented the activation of Akt by hydroquinone. Lastly, hydroquinone and NU7026 exhibited synergistic effects on promoting apop- tosis by increasing the protein levels of pro-apoptotic proteins Bax and caspase-3 but decreasing the protein expression of anti-apoptotic protein Bcl-2. Taken together, the findings reveal a central role of DNA-PKcs in hydroquinone-induced hematotoxicity in which it coordinates DNA DSB repair, cell cycle progression, and apoptosis to regulate the response to hydroquinone-induced DNA damage.

Design Change Model for Effective Scheduling Change Propagation Paths

Changes in requirements may result in the increasing of product development project cost and lead time, therefore, it is important to understand how require- ment changes propagate in the design of complex product systems and be able to select best options to guide design. Currently, a most approach for design change is lack of take the multi-disciplinary coupling relationships and the number of parameters into account integrally. A new design change model is presented to systematically analyze and search change propagation paths. Firstly, a PDS-Be- havior-Structure-based design change model is established to describe requirement changes causing the design change propagation in behavior and structure domains. Secondly, a multi-disciplinary oriented behavior matrix is utilized to support change propagation analysis of complex product systems, and the interaction relationships of the matrix elements are used to obtain an initial set of change paths. Finally, a rough set-based propagation space reducing tool is developed to assist in narrowing change propagation paths by computing the importance of the design change parameters. The proposed new design change model and its associated tools have been demonstrated by the scheduling change propagation paths of high speed train＇s bogie to show its feasibility and effectiveness. This model is not only supportive to response quickly to diversified market requirements, but also helpful to satisfy customer require- ments and reduce product development lead time. The proposed new design change model can be applied in a wide range of engineering systems design with improved efficiency.

On the Mixed Propagator Approach to ρ-ω Mixing

The mixed propagator (MP) approach to ρ-ω mixing is discussed. It is found that under the pole-approximation assumption the results of MP approach is not compatible both with the effective Lagrangian theory andwith the experiment measurement criterion. To overcome these inconsistent, we propose a new MP approach in whichthe physical states of ρ and ω are determined by the requirement of experimental measurement to meson resonance. Interms of this new MP approach, the EM pion form factor Fπ and form factors of ρo →π0γ and of ω→πo γ are derived.The results of Fπ are in good agreement with data. The form factor of ρo →π0γ exhibits a hidden charge-asymmetryenhancement effect which agrees with the prediction of the effective Lagrangian theory.

Comparison between Google Earth KML Data and RTK Data on a Flight Planning Simulated to the Unmanned Aerial Vehicle Microdrone MD4-1000

The UAVs （unmanned aerial vehicles） and the use of graphical data files of extension KML （keyhole markup language） have become popular nowadays. The KML files are associated to the Google Earth applications. Developed by Microdrone company for planning, overflight simulation and data flight analysis, the program mdCockpit was used in this experiment. The UAV Microdrone＇s flight path was programmed in two ways： using geo referenced images from Google Earth and entering points coordinates into the program. These points have had their geographical decimal coordinates collected by GPS （global positioning system） （RTK （real time kinematic）） method. The aim here is to describe a way of evaluating the difference between the alternatives of flight planning. A flight path, defined a route with 22 points, was also simulated in the program mdCockpit. The points were collected and saved, while the images captured by the program went automatically forming a georeferenced mosaic. A comparison between the differences of coordinates to each point was made by choosing on the images and also by a RTK positioning. The result was up to 14.20 m to a 100 m flight height. There is a significant change of position and this can result in unwanted over flights in locations or even jeopardizing the safety of air activity.

新劳动的核心特质及其中国的时代呈现

随着第四次技术革命的到来,各类事物不再困于特定系统中,而是被要素化,随着系统边界的打破被释放出来,并与新要素联结在一起,使劳动呈现出各种新状态。知识劳动、创意劳动、创业劳动、数字劳动等新劳动推动了科技创新与新质生产力的发展。新劳动的核心特质是破壁性与关联性:从劳动方式看,其破除了各类劳动、要素的边界,要求总体性劳动实现高位复归;从劳动时空看,其在时空交错、时空侵占机制作用下,不断突破着生活与工作、虚拟与真实、本地与全球、当下与未来之间的次元壁;从劳动组织和制度看,自上而下的制度规章与自下而上的自主工作加以结合,劳雇双方的身边边界变得模糊,氛围、体验等非制度因素成为激发生产活力的关键。在中国式现代化的进程中,新劳动的出现也对劳动社会学研究提出了破壁与联结的新要求。

邻近性、技术关联与京津冀城市群产业结构路径演化

演化经济地理学认为一个国家或地区的发展具有路径依赖效应。基于产品空间理论和方法,使用2003—2015年中国工业企业数据库的制造企业数据,对京津冀城市群产业技术关联进行研究,并佐以2016—2023年城市统计年鉴数据分析该地区二位代码行业结构演化特征。结果发现:(1)2003—2015年,该地区转化行业的技术关联度变化值大多是正数,说明这些转化行业与原有行业的技术关联度高,反映京津冀城市群经济结构演化具有路径依赖效应。(2)实证表明,2003—2015年间前后两个时段京津冀城市群整体发展受到技术关联的影响都为正向,且具有继承性和一贯性,体现了路径依赖特征,但各阶段区域内部呈现一定异质性,多数城市产业结构演化遵循路径依赖规律的同时,也有少数城市存在因政策等因素导致路径突破的情形。(3)2015—2022年的统计分析进一步佐证了京津冀各城市行业结构演化受原有优势和路径依赖影响和约束的论断。

基于文献计量学的“双碳”学科研究生课程思政研究

碳达峰碳中和(“双碳”)目标对相关学科人才培养提出了更高的要求,也为“双碳”学科研究生课程思政注入了新的内涵。该文基于文献计量学(CiteSpace科学计量可视化软件),分析我国研究生课程思政教学研究现状,结合新出现的研究热点关键词,提出未来“双碳”学科研究生课程思政教学研究的三条突破路径:广泛而深入地挖掘思政元素,实现专业知识与思政元素内化融合;促进相关学科深度融合、交叉出新;构建多维度高质量的课程评价体系,将课程思政建设融入人才培养全过程,构建基于创新驱动发展背景的“双碳”学科研究生课程思政新模式。

中国式现代化进程中教育、科技、人才“三位一体”的守正创新

党的二十大报告首次将教育、科技、人才统筹部署,置于中国式现代化进程中,强调“基础性、战略性支撑”功能,构成“三位一体”新论断。历经分立为革命服务、单向度线性影响的初生萌芽、联动整合发展的初步形成、创新连接交互的正式形成四个阶段的历史探索,这一过程体现中国共产党对三项工作的准确研判和科学调整。“三位一体”新论断守党性与人民性统一的方向立场之正;守马克思主义教育、科技、人才思想中国化时代化的魂脉之正;守中华优秀传统文化教育、科技、人才思想的根脉之正。在中国式现代化的现实逻辑下,把握“三位一体”更具战略性、系统性;教育是前提与根本,强化坚固度;科技是支撑与纽带,增强协调度;人才是主体与目的,提高促进度;创新是连接点,确保流畅度。教育、科技、人才“三位一体”遵循马克思主义中国化时代化之“守正创新”方法论,体现守正与创新的辩证统一关系,推动建设教育强国、科技强国、人才强国,释放以中国式现代化推进中华民族伟大复兴合力。

变与不变:传统生产力到新质生产力质态演进的辩证法探索

新中国成立以来,中华民族迎来了从站起来、富起来到强起来的伟大飞跃,生产力理论也随着时代的变化而不断发展,经历了从“探索与实践”到“发展与深化”再到“质变与创新”的理论变迁。此外,新质生产力是新时代生产力出现的新质态,是传统生产力的质态跃迁,从传统生产力到新质生产力的质态演进过程中,深刻凸显出“变”与“不变”的辩证法意蕴,这是守正创新在现实中的具体表现,展现了生产力质态变迁的实践脉络。基于此,将生产力理论层面与生产力质态演进的实践层面相结合,从科技创新、体制改革、人才素质以及国际合作四个维度出发,提出“推进形成新质生产力”的实践路径,具有十分重要的理论意义和实践价值。

青年大学生“内卷化”表征、归因及“破圈”路径研究

在“稳就业,保就业”宏观政策背景下,教育“内卷化”问题愈发突显并受到社会的普遍关注。青年大学生“内卷化”呈现工具主义、自我异化、现代性焦虑和亚文化的现实表征。目前青年就业市场上有效供给与有效需求“双不足”,学历变相“贬值”、就业择业观念等因素加速“内卷化”进程,社会、学校和个人因素相互交织、错综复杂。厘清问题根源,可以对症下药破除复杂“内卷”乱象,有效疏解社会公平、人才选拔与教育内卷之间的关系。为此,须要构建自内向外的“破圈”路径,涵盖树立正确择业观念、涵养青年奋斗观、建立多元人才培养体系、打造校企合作“练兵场”、提供就业政策支撑和净化求职竞争环境等方面。

河南农村题材短视频的创作困境与“破圈”路径

随着乡村振兴战略的全面推进与互联网的迅猛发展,农村题材短视频成为推动农业经济转型、产业增长、带动农村发展的重要阵地。河南作为农业大省,拥有丰厚的乡村资源和独特的地缘文化,加之短视频的低门槛与高流量催生了大批农村题材短视频创作博主。以5个河南农村短视频账号为研究范本,通过创作主体、内容主题和价值生成三个层面分析其创作困境:客观纪录与艺术性创作的错位、泛娱乐化与现实主义表达的错位、流量争夺与文化传播的错位。并围绕创作主体的专业化驱动、创作主题的主流化引导、文化价值优质化传播探索农村题材短视频的“破圈”路径。

焦炉边火道温度低的原因分析及处理方案

为解决安泰集团焦化厂二炼焦车间JN60型焦炉出现的边火道温度低,个别火道窜漏导致燃烧不正常的问题。通过现场了解边火道温度现状,从数据出发分析出现此情况的原因是管砖破裂。采用更换管砖和喷补灌浆处理的方法,解决了边火道温度低的问题。为同行业同类型焦炉提供技术参考和借鉴。

列宁对普列汉诺夫教条主义的批判及当代启示

作为俄国马克思主义先驱和工人运动活动家的普列汉诺夫曾对教条主义予以深刻批判,也因批判教条主义而享誉俄国,但在俄国革命道路这一重大问题上,他在晚年却戏剧性地走向了教条主义。其表现为:以“两个决不会”批评列宁的《四月提纲》是散播无政府主义混乱状态的疯狂企图,批评列宁依靠觉悟不高的劳动群众开展革命,批评列宁对社会主义革命取得胜利盲目乐观。列宁以马克思主义历史辩证法有力地批判了普列汉诺夫,指出俄国社会主义革命具备一定的经济条件,强调进行社会主义革命的方法并非只有一种,肯定俄国社会主义革命拥有有利的阶级条件。列宁对普列汉诺夫教条主义的批判体现出了对待马克思主义的守正创新的科学态度、科学的马克思主义革命辩证法、马克思主义的大无畏精神。坚持这些优良传统对于我们建设中华民族现代文明、推进中国式现代化无疑具有重要的理论意义与实践价值。

云南省茶叶出口实现“破壁”的路径研究及建议

随着全球经济一体化浪潮的不断推进,中国茶产业发展突飞猛进,茶叶出口量、出口额屡创历史新高。2020年我国提出“逐步形成以国内大循环为主体、国内国际双循环相互促进的新发展格局”的双循环战略,进一步推动茶产业跨境贸易是中国茶叶贸易的大趋势。云南省作为我国著名的茶叶生产地之一,茶叶出口总量仅约占全国茶叶出口总量的1%,就当前而言,全球的茶叶供需比较平缓,供需矛盾并不突出,云南茶产业的跨境贸易需要紧跟“国内国际双循环”和“一带一路”新机遇。茶叶贸易正处于瓶颈与突破、机遇与发展并存的时期。云南省茶叶协会和昆明海关数据显示,云南茶叶出口量自2016年开始呈逐年增长趋势,至2019年出现不稳定波动,2022年和2023年又呈下降趋势;作为中国主要的茶叶产区,随着国内外茶叶市场竞争的不断加剧,云南茶产业的市场竞争力亟需进一步提升。云南茶产业面临对内行业“内卷”不断加剧,对外市场开发受限的问题,云南茶叶出口贸易如何“破壁”成为云南省内茶行业企业和政府部门重点关注的问题,本文将通过对云南省近年来茶叶出口的数据分析和对比,找出当前形势下云南省茶叶出口的主要问题,并就此提出解决问题的建议,以供参考。

组织结构变革中的路径依赖与路径突破

组织结构变革是组织管理研究中的核心问题之一。结构变革中的路径依赖形成与突破涉及不同层面的众多因素,现有研究中缺乏将组织微观动力机制与组织结构变革进行整体分析的视角。但研究发现,组织结构系统内生地蕴含着路径依赖和路径突破的特性。组织内部因组织结构惰性而导致的路径依赖具有两面性。当外部环境发生变化时,组织变革领导者必须认识到路径依赖产生的积极影响和消极影响,通过组织学习,突破行为惯性和管理认知惯性,充分发挥路径创造和路径突破方面的能动性,"有意识地偏离"组织原有的路径,积极进行路径突破和创造。

2.4GHz CBTC车地通信系统在隧道中的传播特性研究

目前的城市轨道交通车地通信技术大多采用2.4GHz的ISM频段。本文给出2.4GHz无线局域网在北京地铁昌平线隧道内传播的现场测试结果,并结合Fresnel区的定义以及Wireless InSite仿真软件研究隧道中2.4GHz无线电波的传输规律,说明在实际隧道中使用经验混合传播模型计算近区和远区转折点的不足,以及隧道内金属反射体和其他遮挡物对转折点的位置确定存在较大的影响。利用最小二乘法对测试结果进行直线拟合,得到近区和远区不同的路径损耗因子,使近区信号波动相对于远区较剧烈的结论得到验证。对近区和远区的信号波动分布进行统计,指出其近似莱斯分布的特性。

复杂介质地震初至波数值模拟

发展了一种地震初至波(firstbreak)数值模拟的旅行时插值波前追踪方法.将复杂变速介质剖分成匀速的矩形或多边形单元,在单元边界上设置一些对波前旅行时采样的节点.首先从震源开始计算波前到达所有节点的旅行时,然后从接收点开始反向确定震源与接收点之间的射线路径.其中,到达任意一点的波前旅行时和射线是通过对该点所在单元其它两两相邻的已算节点旅行时的插值和Fermat原理求极小而获得的.该算法对介质的复杂程度、单元形状和震源与接收点的位置没有限制,能模拟直达波、临界折射波和绕射波以及盲区射线等,具有较强的适应性和较高的精度.用该方法对一些典型近地表模型的初至波进行了数值计算,清晰地显示出这些模型的波前形态和射线路径.

基于源流路径剖分的输电断面快速搜索

过载支路切除引起大规模潮流转移是导致连锁故障的重要原因。为快速、准确和全面地搜索到受潮流转移影响较大的线路构成的输电断面,提出了一种基于源流路径剖分的输电断面快速搜索算法。该算法首先根据实际电网结构利用图论知识生成有向图,建立送端节点-送电支路邻接表,快速生成源流路径树,逐步搜索有效源流路径链,最后计算所有有效源流路径链中所包含支路的开断分布因子,识别出受潮流转移影响较大的线路。所提算法无需进行全网拓扑搜索,无大规模矩阵运算,因此算法简便,搜索快速。对IEEE39节点系统进行仿真分析,其结果证明了所提算法的快速性与正确性。