江西相山居隆庵铀矿床隐式三维地质建模

目前铀矿床的三维地质建模主要采用显式建模方法,但该方法在建模过程中存在大量人机交互操作,且数据变化后模型难以快速更新。为提高铀矿床三维地质建模效率,探索运用快速径向基函数插值法进行三维地质建模,该方法可直接运用钻孔分层数据进行空间数据插值快速构建三维地质模型。文章选用Leapfrog Geo软件为建模平台,运用35个钻孔数据和隐式函数快速、自动、高精度构建了居隆庵铀矿床三维地质模型,并运用后增的3个钻孔数据对模型进行了快速动态更新。结果表明,隐式三维地质建模具有速度快、操作简单、精度高、模型可快速更新等特点,可为其他地区的铀矿床三维地质建模提供技术借鉴。构建的居隆庵铀矿床三维地质模型立体呈现了矿区深部各地质体的三维形态特征,为下一步深部找矿提供了重要依据。

温控和气调技术在各热量带呼吸跃变型水果贮藏中的应用

呼吸跃变型水果采后会出现呼吸速率升高至呼吸高峰后迅速成熟、衰老、软化的现象。本研究总结了不同温度与气调保鲜技术在不同呼吸跃变型水果的应用现状,针对不同贮藏技术对不同热量带水果品质的影响进行综述,发现热带及亚热带地区的水果多数采用低温以及气调相结合的贮藏方式,而温带地区的水果则多采用单一低温贮藏方式,目前对不同热量带水果贮藏技术的研究都在由单一贮藏方法向复合贮藏方法转变,低温结合气调包装技术对呼吸跃变型水果的适用性最强,但由于不同水果自身呼吸作用产生呼吸高峰的规律不同,在确定气调包装材料与贮藏温度方面有待进一步研究。

对外直接投资对工业绿色转型的双重效应——基于双边随机前沿模型的分析

工业绿色转型是实现新型工业化的重要条件,也是建设工业强国的关键环节。为进一步识别工业绿色转型的新动力,厘清对外直接投资对工业绿色转型的影响效应与跃迁趋势,基于中国30个省份2004—2020年的面板数据,该研究构建双边随机前沿模型测算了对外直接投资对工业绿色转型的溢出效应、挤出效应以及净效应,并结合Markov链方法预测对外直接投资对工业绿色转型净效应影响的跃迁趋势。结果表明:①对外直接投资对工业绿色转型具有溢出和挤出双重效应,溢出效应使工业绿色转型提高了31.472%,挤出效应使工业绿色转型降低了11.739%,二者的净效应使工业绿色转型实际提高了19.733%。②对外直接投资对工业绿色转型的溢出效应占主导地位,但在时间和空间上具有异质性,剔除挤出效应的影响,净效应在2004—2020年间呈现出先升后降的倒“U”型特征,并在中部最大、东部最小。③生产要素由资源依赖向技术依赖的优化调整能够与对外直接投资形成协作适配,促进工业绿色转型。④对外直接投资对工业绿色转型的净效应有一定程度的稳定性,拥有长期增长趋势,但也有跌落的风险。因此,未来应持续扩大对外直接投资规模、优化投资结构、推进国际科技合作,通过强化对外直接投资的溢出效应和削弱其挤出效应助力工业绿色转型。

等离子体中的CDLT-Leapfrog-ADI-FDTD方法

采用电流密度拉普拉斯变换(Current Density Laplace Transform)方法将无子时间步的蛙跳式交替方向隐式时域有限差分(leapfrog-ADI-FDTD)方法应用于等离子体的电磁计算中,得到了等离子体中的迭代公式。为了验证该方法的有效性,计算了等离子体平板的反射系数和透射系数,并与几种传统的FDTD方法进行了对比,数值实验表明,提出的算法具有无条件稳定性,精度和效率高于普通的显式FDTD方法。

生产方式总运动视域下的新质生产力发展

从唯物史观高度看,新质生产力是新时代经济社会高质量发展的最根本力量。从生产方式总运动视域考察新质生产力发展,揭示新质生产力发展的社会关系再生产的总过程十分必要。生产方式总运动视域下,对新质生产力发展的认识包括:新质生产力是历史发展中先进的、全面发展的生产力,具有多样性;跨越式发展是新质生产力的主要实现方式;推进新质生产力发展需要自觉处理一系列特殊性矛盾;新质生产力的发展总是借助一定的世界交往条件实现的。以社会关系的再生产逻辑来呈现新质生产力社会运动过程,有利于深入地把握新质生产力的完整内涵、实现方式、特殊性矛盾以及世界交往条件下的发展规律。

以信息化带动工业化实现经济跨越式发展的探讨

探讨了信息化如何通过提高生产效率、优化资源配置、促进创新与研发等方面对工业化产生积极影响,分析了信息化在制造业、能源行业和农业等不同工业领域的应用案例,提出了以信息化带动工业化促进经济跨越式发展的实现途径,包括产业升级与结构优化、新兴产业的培育与发展以及区域经济的协调发展。

高等教育强省战略的成效评估及发展对策研究——以浙江为例

为进一步深化高等教育改革,助推教育强国建设,浙江于2018-2022年间实施“高教强省”战略。本文对建设期内浙江、江苏、陕西、广东、湖北、山东、上海高等教育发展状况进行历时性和共时性比较。分析表明,浙江在事业规模、结构布局、人才培养、科研创新、国际化等方面取得了跨越式发展;同时存在优质资源相对不足、布局结构对接产业有待加强、高校功能分层问题尚待破解、国家级人才数量缺乏优势、高层次人才培养短板呕待补齐、数字化建设发展机制不健全等挑战。对此,本文提出对策建议,以助力浙江“高教强省”建设迈上新台阶。

Leapfrog and Inheritance of New Rural Construction in Urbanization——A Case Study of Haiyang Village of Jiangxia District of Wuhan City in China

The paper has introduced characteristics and study status of new rural construction, illustrated the connotation of leapfrog development of new rural construction, and considered that new rural construction is an important measure to solve "three rural" problems. How to conduct new rural construction in urbanization is a critical issue in social and economic development in China. Based on the favorable condition and development mode of current new rural construction, by taking new rural construction of Haiyang Village in Jiangxia District of Wuhan City for example, it has analyzed the leapfrog development in terms of traditional agriculture, villagers' life quality and rural concept, and the inheritance in terms of culture and rural appearance, so as to give enlightenments to new rural construction in the future.

Leapfrog Technology and How It Applies to Trackless Tram

Rapid innovation and development of modern technology has brought about the opportunity for developing economies to technological leapfrog. In particular, rather than going through all the learning curve and costly process experienced by developed countries, emerging economies instead can take advantage of the opportunities presented by technological shifts. However, inadequate infrastructure is the cause of most challenges that these developing economies presently face. Energy, road, transport and telecommunication networks are the most critical infrastructure needed to drive a sustainable development and economic growth. As seen in many emerging economies, small private cars are still dominating the public transport sector, even though it is evident that they are congesting the poorly managed and crumbling road infrastructure. Most emerging economies’ cities are currently experiencing rapid urbanisation that is leading to massive population explosion. These rapidly growing cities should adopt latest technologies, such as Trackless Trams Systems (TTS). There is no doubt that TTS can probably help in dealing with most of the transport problems experienced in rapidly growing urban areas within emerging economies. This paper seeks to explore the opportunities presented by TTS to bring about the needed technological leapfrogging for the developing countries that are resource constrained to build modern and expensive mass public transport infrastructure. An ideal example of a recent successful technological leapfrog in emerging economies is the low-cost mobile phones and increasingly expanding wireless access in urban areas. As such, countries have been able to eliminate the challenge of building fixed-line telecommunications infrastructure, which is capital-intensive. In this study we are undertaking a literature appraisal on technological leapfrogging, and demonstrate how TTS measure up as a potential technology to aid the leapfrogging for the urban transport systems more so in developing countries. The study discusses the features, quality, and proficiencies of the new technology. To consider technology for leapfrogging, it ought to be economical enough, less technical, lends itself to partnership, lends itself to community engagement, allows co-development, and fulfils sustainable development goals (SDGs). The paper is organized into four sections, the introduction, literature appraisal, experiential evidence and debate on Trackless Trams, and conclusion.

A Homogeneous Cloud Task Distribution Method Based on an Improved Leapfrog Algorithm

Cloud manufacturing is a new manufacturing model with crowd-sourcing characteristics,where a cloud alliance composed of multiple enterprises,completes tasks that a single enterprise cannot accomplish by itself.However,compared with heterogeneous cloud tasks,there are relatively few studies on cloud alliance formation for homogeneous tasks.To bridge this gap,a novel method is presented in this paper.First,a homogeneous cloud task distribution model under cloud environment was constructed,where services description,selection and combination were modeled.An improved leapfrog algorithm for cloud task distribution(ILA-CTD)was designed to solve the proposed model.Different from the current alternatives,the initialization operator and the leapfrog operator in ILA-CTD can ensure that the algorithm always searches the optimal solution in the feasible space.Finally,the processing of task allocation for 1000 pieces of medical labeling machine bottom plates was studied as a case to show the feasibility of the proposed method.The superiority of ILA-CTD was also proven based on more optimal solutions found,compared with the three other methods.

Filtered Leapfrog Time Integration with Enhanced Stability Properties

The Leapfrog method for the solution of Ordinary Differential Equation initial value problems has been historically popular for several reasons. The method has second order accuracy, requires only one function evaluation per time step, and is non-dissipative. Despite the mentioned attractive properties, the method has some unfavorable stability properties. The absolute stability region of the method is only an interval located on the imaginary axis, rather than a region in the complex plane. The method is only weakly stable and thus exhibits computational instability in long time integrations over intervals of finite length. In this work, the use of filters is examined for the purposes of both controlling the weak instability and also enlarging the size of the absolute stability region of the method.

The Wellbore Temperature and Pressure Behavior during the Flow Testing of Ultra-Deepwater Gas Wells

The transientflow testing of ultra-deepwater gas wells is greatly impacted by the low temperatures of seawater encountered over extended distances.This leads to a redistribution of temperature within the wellbore,which in turn influences theflow behavior.To accurately predict such a temperature distribution,in this study a comprehensive model of theflowing temperature and pressurefields is developed.This model is based on principles offluid mechanics,heat transfer,mass conservation,and energy conservation and relies on the Runge-Kutta method for accurate integration in time of the resulting equations.The analysis includes the examination of the influence of various factors,such as gasflow production rate,thermal diffusivity of the formation,and thermal diffusivity of seawater,on the temperature and pressure profiles of the wellbore.The keyfindings can be summarized as follows:1.Higher production rates during testing lead to increasedflowing temperatures and decreased pressures within the wellbore.However,in the presence of a seawater thermocline,a crossover inflowing temperature is observed.2.An increase in wellbore pressure is associated with larger pipe diameters.3.Greater thermal diffusivity of the formation results in more rapid heat transfer from the wellbore to the formation,which causes lowerflowing temperatures within the wellbore.4.In an isothermal layer,higher thermal diffusivity of seawater leads to increased wellboreflowing temperatures.Conversely,in thermocline and mixed layer segments,lower temperatures are noted.5.Production test data from a representative deep-water gas well in the South China Sea,used to calculate the bottom-seafloor-wellhead temperature and pressurefields across three operating modes,indicate that the average error in temperature prediction is 2.18%,while the average error in pressure prediction is 5.26%,thereby confirming the reliability of the theoretical model.

Extensive Numerical Tests of Leapfrog Integrator in Middle Thermostat Scheme in Molecular Simulations

Accurate and efficient integration of the equations of motion is indispensable for molecular dynamics(MD)simulations.Despite the massive use of the conventional leapfrog(LF)integrator in modern computational tools within the framework of MD propagation,further development for better performance is still possible.The alternative version of LF in the middle thermostat scheme(LFmiddle)achieves a higher order of accuracy and efficiency and maintains stable dynamics even with the integration time stepsize extended by several folds.In this work,we perform a benchmark test of the two integrators(LF and LF-middle)in extensive conventional and enhanced sampling simulations,aiming at quantifying the time-stepsizeinduced variations of global properties(e.g.,detailed potential energy terms)as well as of local observables(e.g.,free energy changes or bondlengths)in practical simulations of complex systems.The test set is composed of six chemically and biologically relevant systems,including the conformational change of dihedral flipping in the N-methylacetamide and an AT(AdenineThymine)tract,the intra-molecular proton transfer inside malonaldehyde,the binding free energy calculations of benzene and phenol targeting T4 lysozyme L99A,the hydroxyl bond variations in ethaline deep eutectic solvent,and the potential energy of the blue-light using flavin photoreceptor.It is observed that the time-step-induced error is smaller for the LFmiddle scheme.The outperformance of LF-middle over the conventional LF integrator is much more significant for global properties than local observables.Overall,the current work demonstrates that the LF-middle scheme should be preferably applied to obtain accurate thermodynamics in the simulation of practical chemical and biological systems.

leapfrog对某矿区各锌矿体的圈定简析

用leapfrog对某矿区圈定矿体实体模型,并对矿体模型进行距离幂次反比法估算资源量。资源量分级据钻孔与矿体相交点的距离进行划分,小于160m的圈成探明资源量,160至320m的圈成控制资源量,320至640m的圈成推断资源量;工程间距无限外推即采用见矿工程点向外平推80m圈成推断资源量。本次资源量估算范围除了北矿带东段采矿权外还新增了Ⅱ区的矿体。本次收集的品位表格中总共有2623个样品具有Zn品位值,但对应具有Pb品位值得样品只有1144个样品。由于Pb的数据很少,所以本次只对Zn矿体进行实体圈定并估算资源量,边界品位采用矿山生产的边界品位,即Zn的边界品位为0.6%,Pb品位未参与实体圈定和资源量估算。

Identification of Technology Catch-up Path from the Perspective of Technology Leapfrogging

Objective To propose a method to identify the shortest catch-up path by using patent data based on the perspective of technology leapfrogging so as to provide a reference for the catch-up strategy formulation by the governments of the developing countries.Methods Firstly,the international patent classification(IPC)co-occurrence network was used to screen key technologies,and the TOP 5 countries and China were located from the aspects of technology life cycle and technological innovation capabilities.Next,the technology development path based on the ordered clustering algorithm and the main IPC number was set up.Finally,the Dijkstra algorithm was applied to identify the shortest catch-up path.Results and Conclusion Applying this method to the current biopharmaceutical industry with the most potential for development,the shortest catch-up paths are found in the selected C12N15,C07K14 and C12Q1 technology fields,proving the feasibility of the method.

中国装备制造企业跨越式升级的实现机制:数字技术赋能逻辑与路径

当前中国装备制造业仍处于“大而不强”的阶段,国际竞争力亟待提升。依附式升级作为中国装备制造企业普遍采用的升级方式,弊端日益凸显,中国装备制造企业迫切需要突破升级瓶颈,实现跨越式升级。随着大数据、云计算等数字技术的应用场景不断拓宽,充分发挥数字技术的赋能作用将有助于中国装备制造企业跨越式升级。首先,从效率和柔性两方面规范分析数字技术赋能的底层逻辑;然后,深入讨论中国装备制造企业跨越式升级过程中基于数字技术进行技术知识获取、产品开发迭代以及技术价值实现的链式路径;最后,从数字技术提供方、装备制造企业以及数字技术应用环境优化3个角度提出充分发挥数字技术赋能作用的政策建议。

China Experts to Study How leapfrogging' Strategy Will Work

In the 10th Five-Year Plan for National Economic and Social Development （2001-05）,the centralauthorities announced that Chinawill adopt a ’leapfrogging’tactic forits technological development. Butthe questions raised by Chinese sci-entists are:How this can

Suggestions on Leapfrogging Development in Tibet

The realization of leapfrogging socio-economic development in the Tibet Autonomous Region remains a key issue in the current drive to develop Western China. In this connection, the CAS Academic Divisions have sponsored a task force of a dozen CAS members and nearly 30 other experts to conduct comprehensive studies on the subject, and presented a feasibility study report to the central government. Some of their main ideas are as follows:

Make Leapfrogging Development By Concentrating Resource On Selected Targets

The Chinese Academy of Sci-ences (CAS) has begun introducingthe trial implementation of theKnowledge Innovation Program(KIP)in an all-round manner just as,at the beginning of the new century,the state is about to implement itsTenth Five-Year Plan for thecountry’s ongoing economic andsocial development. This will

开放实验室内部网络非法入侵准确检测仿真

为了确保开放实验室网络的安全运行,降低入侵风险检测误检率,提出一种开放实验室内部网络非法入侵检测方法。引入RBF神经网络构建开放实验室内部网络非法入侵检测模型,提取隐含层权值参数,对隐含层权值优化处理;采用自适应蛙跳算法对非法入侵检测模型求解,在经典蛙跳算法的基础上引入变异操作,并通过层次分析方法调整不同影响参数权重,避免陷入局部最优,实现入侵检测。仿真结果表明,所提方法可以有效提升网络非法入侵检测率,降低误检率,获取更加精准的检测结果。