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基于马尔可夫到达过程的两级可修备件(S-1S)库存优化模型

陈 童,黎 放,狄 鹏

《中国工程科学》 2015年 第17卷 第5期   页码 113-119

摘要: ,采用马尔可夫到达过程(MAP)描述备件需求规律,考虑有限维修设施的情况,假设故障件维修时间、备件运输时间以及采购时间均服从phase-type(PH)分布,建立了一种描述能力更强、解析计算性更好的(S-11S)库存优化模型,并推导出系统缺货量分布函数;然后通过算例演示了模型的优化效果,验证了模型的正确性和适用性。

关键词: S-1S)库存策略;两级库存;可修备件;马尔可夫到达过程    

中国的探月工程——中国航天第三个里程碑

栾恩杰

《中国工程科学》 2006年 第8卷 第10期   页码 31-36

摘要:

人类对月球的探测显示了人类的智慧和能力,也带动了人类社会及科学技术的进步和发展。中国以“绕”、“落”、“回”为标志的探月工程是中国航天的第三个里程碑性工程,既是国力强大的体现,也是中国航天能力的表征。

关键词: 中国航天     月球勘探     嫦娥1   

Recovery of free volume in PIM-1 membranes through alcohol vapor treatment

Faiz Almansour, Monica Alberto, Rupesh S. Bhavsar, Xiaolei Fan, Peter M. Budd, Patricia Gorgojo

《化学科学与工程前沿(英文)》 2021年 第15卷 第4期   页码 872-881 doi: 10.1007/s11705-020-2001-2

摘要: Physical aging is currently a major obstacle for the commercialization of PIM-1 membranes for gas separation applications. A well-known approach to reversing physical aging effects of PIM-1 membranes at laboratory scale is soaking them in lower alcohols, such as methanol and ethanol. However, this procedure does not seem applicable at industrial level, and other strategies must be investigated. In this work, a regeneration method with alcohol vapors (ethanol or methanol) was developed to recover permeability of aged PIM-1 membranes, in comparison with the conventional soaking-in-liquid approach. The gas permeability and separation performance, before and post the regeneration methods, were assessed using a binary mixture of CO and CH (1:1, v:v). Our results show that an 8-hour methanol vapor treatment was sufficient to recover the original gas permeability, reaching a CO permeability>7000 barrer.

关键词: polymer of intrinsic microporosity (PIM)     PIM-1     physical aging     gas separation     vapor-phase regeneration    

基于最大密度的小型无人机电机速度估计与故障检测 Research Articles

Jefferson S. SOUZA1,Moises C. BEZERRIL1,Mateus A. SILVA1,Frank C.BRITO1

《信息与电子工程前沿(英文)》 2021年 第22卷 第7期   页码 1002-1009 doi: 10.1631/FITEE.2000149

摘要: 介绍了基于混沌的最大密度信号分析技术在无刷直流电机分析中的应用。利用了从电流信号最大密度估计得出的相关系数。通过实验实现了无刷电机在试验台上的速度估计以及在小型无人机上的故障检测。实验结果表明,在97.8%的案例中可估计电机速度,在82.75%的分析案例中可检测故障。

关键词: 无人机;速度识别;故障检测;混沌    

Determination of growth kinetics of microorganisms linked with 1,4-dioxane degradation in a consortium

《环境科学与工程前沿(英文)》 2022年 第16卷 第5期 doi: 10.1007/s11783-022-1567-y

摘要:

● Evaluated three methods for determining the consortia’s growth kinetics.

关键词: Biodegradation     1     4-Dioxane     Kinetics     Microbial consortium     16S rRNA    

Regulatory mechanism and functional analysis of

null

《医学前沿(英文)》 2017年 第11卷 第1期   页码 87-96 doi: 10.1007/s11684-016-0469-4

摘要:

S100A9, a calcium-binding protein, participates in the inflammatory process and development of various tumors, thus attracting much attention in the field of cancer biology. This study aimed to investigate the regulatory mechanism of and its function involvement in APL. We used real-time quantitative PCR to determine whether PML/RARα affects the expression of in NB4 and PR9 cells upon ATRA treatment. ChIP-based PCR and dual-luciferase reporter assay system were used to detect how PML/RARα and PU.1 regulate promoter activity. CCK-8 assay and flow cytometry were employed to observe the viability and apoptosis of NB4 cells when was overexpressed. Results showed that was an ATRA-responsive gene, and PML/RARα was necessary for the ATRA-induced expression of in APL cells. In addition, PU.1 could bind to the promoter of , especially when treated with ATRA in NB4 cells, and promote its activity. More importantly, overexpression of induced the apoptosis of NB4 cells and inhibited cell growth. Collectively, our data indicated that PML/RARα and PU.1 were necessary for the ATRA-induced expression of in APL cells. Furthermore, promoted apoptosis in APL cells and affected cell growth.

关键词: S100A9 S100A9     PU.1     PML/RARα     ATRA     APL    

解决一维材料黏附行为的实验方法综述 Review

Mead, Shiliang Wang, Sören Zimmermann, Sergej Fatikow, Han Huang

《工程(英文)》 2023年 第24卷 第5期   页码 39-72 doi: 10.1016/j.eng.2023.02.012

摘要:

一维(1D)材料(如纳米管和纳米线)的黏附行为在集成一维组件的新型器件以及基于一维阵列的仿生黏合剂的有效制造、功能和可靠性中起着决定性作用

关键词: 界面粘附     一维材料     纳米线     碳纳米管     纳米操控     表面力     机械剥皮    

我国小麦生产应对入世之策略

白选杰

《中国工程科学》 2003年 第5卷 第3期   页码 21-24

摘要:

我国小麦生产应对入世的主要策略是:依靠先进栽培技术,提高小麦生产效益;调整优化种植结构,发展优质专用小麦;积极发展商品生产,认真搞好深层加工;搞好产销衔接工作,扩大小麦市场销售;科研推广通力合作,提高生产科技含量;充分利用“绿箱"政策,加大财政支持力度。

关键词: 小麦     WTO     策略    

Insight into the role of cholesterol in modulation of morphology and mechanical properties of CHO-K1

Lei Zhang, Lisha Zhao, Ping-Kai Ouyang, Pu Chen

《化学科学与工程前沿(英文)》 2019年 第13卷 第1期   页码 98-107 doi: 10.1007/s11705-018-1775-y

摘要:

Cholesterol plays a significant role in the organization of lipids and modulation of membrane dynamics in mammalian cells. However, the effect of cholesterol depletion on the eukaryotic cell membranes seems controversial. In this study, the effects of cholesterol on the topography and mechanical behaviors of CHO-K1 cells with manipulated membrane cholesterol contents were investigated by atomic force microscopy (AFM) technique. Here, we found that the depletion of cholesterol in cell membranes could increase the membrane stiffness, reduce the cell height as well as promote cell retraction and detachment from the surface, whereas the cholesterol restoration could reverse the effect of cholesterol depletion on the membrane stiffness. Increased methyl-β-cyclodextrin levels and incubation time could significantly increase Young’s modulus and degree of stiffing on cell membrane and cytoskeleton. This research demonstratede importance of cholesterol in regulating the dynamics of cytoskeleton-mediated processes. AFM technique offers excellent advantages in the dynamic monitoring of the change in membranes mechanical properties and behaviors during the imaging process. This promising technology can be utilized in studying the membrane properties and elucidating the underlying mechanism of distinct cells in the near-native environment.

关键词: cholesterol     methyl-β-cyclodextrin     atomic force microscopy     Young’s modulus     CHO-K1 cell    

一种满足末端姿态约束的工业机械臂分布式变密度路径搜索与简化方法 Research Article

王进1,2,厉圣杰1,2,张海运3,陆国栋1,2,冯奕畅1,2,王鹏1,2,李基拓1,2

《信息与电子工程前沿(英文)》 2023年 第24卷 第4期   页码 536-552 doi: 10.1631/FITEE.2200353

摘要: 在许多机器人操作场景中,末端执行器的运动姿态约束是机器人完成焊接、喷涂、搬运、码垛等常见任务必不可少的。同时,姿态约束下的路径规划过程中涉及到逆运动学、碰撞检测和空间搜索等关键问题,在实际应用中难以兼顾令人满意的效率和约束效果。针对这些问题,提出一种带末端约束的工业机器人分布式变密度路径规划方法(DVDP-AC)。首先,针对运动学逆解提出位置–姿态约束重构(PACR)方法。然后,设计了具有单步安全球(SSS)的分布式有向距离场(DSDF)模型,以提高碰撞检测的效率。在此基础上,在笛卡尔空间中采用变密度路径搜索方法,并进一步提出一种考虑路径可达性的前向路径简化方法(FSPS),以自适应地快速消除冗余的路径点。最后,实验结果验证了所提出的DVDP-AC方法在末端执行器姿态约束下的性能和有效性,并与目前主流路径规划方法进行比较,说明了该方法的特点和优势。

关键词: 路径规划;工业机器人;分布式有向距离场;姿态约束;路径简化    

Effect of biochar amendment on soil’s retention capacity for estrogenic hormones from poultry manure

Sukhjot MANN, Zhiming QI, Shiv O. PRASHER, Lanhai LI, Dongwei GUI, Qianjing JIANG

《农业科学与工程前沿(英文)》 2017年 第4卷 第2期   页码 208-219 doi: 10.15302/J-FASE-2017138

摘要: Most animals, including humans, produce natural sex hormones such as estrogens: 17β-estradiol (E2) and estrone (E1). These compounds are able to disrupt the reproductive systems of living organisms at trace concentrations (ng·L ). This experiment tests the hypothesis that 1% slow pyrolysis biochar-amended sandy soil could retain significant amount of estrogens (E1, E2) from poultry manure in its second year of application. The experiment was conducted over 46 days and consisted of a series of lysimeters containing sandy soil with biochar-amended topsoil. The application rate of poultry manure was kept at 2.47 kg·m . The biochar held a significant concentration of hormone during the first year of its application. However, in the following year (current study), there was no significant retention of hormones in the biochar-amended soil. During the first year after application, the biochar was fresh, so its pores were available for hydrophobic interactions and held significant concentration of hormones. As time passed there were several biotic and abiotic changes on the surface of the biochar so that after some physical fragmentation, pores on the surface were no longer available for hydrophobic interactions. The biochar started releasing dissolved organic carbon, which facilitated greater mobility of hormones from poultry manure down the soil profile.

关键词: adsorption     degradation     dissolved organic carbon     17β-estradiol (E2)     estrone (E1)    

Modelling the dynamic response of a solid oxide steam electrolyser to transient inputs during renewable hydrogen production

BRANDON, Claire S. ADJIMAN,

《能源前沿(英文)》 2010年 第4卷 第2期   页码 211-222 doi: 10.1007/s11708-010-0037-6

摘要: Hydrogen is regarded as a leading candidate for alternative future fuels. Solid oxide electrolyser cells (SOEC) may provide a cost-effective and green route to hydrogen production especially when coupled to a source of renewable electrical energy. Developing an understanding of the response of the SOEC stack to transient events that may occur during its operation with intermittent electricity input is essential before the realisation of this technology. In this paper, a one-dimensional (1D) dynamic model of a planar SOEC stack has been employed to study the dynamic behaviour of such an SOEC and the prospect for stack temperature control through variation of the air flow rate. Step changes in the average current density from 1.0 to 0.75, 0.5 and 0.2 A/cm have been imposed on the stacks, replicating the situation in which changes in the supply of input electrical energy are experienced, or the sudden switch-off of the stack. Such simulations have been performed both for open-loop and closed-loop cases. The stack temperature and cell voltage are decreased by step changes in the average current density. Without temperature control via variation of the air flow rate, a sudden fall of the temperature and the cell potential occurs during all the step changes in average current density. The temperature excursions between the initial and final steady states are observed to be reduced by the manipulation of the air flow rate. Provided that the change in the average current density does not result in a transition from exothermic to endothermic operation of the SOEC, the use of the air flow rate to maintain a constant steady-state temperature is found to be successful.

关键词: hydrogen production     renewable energy     solid oxide electrolyser cell     1D dynamic model     dynamic behaviour     temperature control    

智简无线网络理论与技术 Editorial

张平1,彭木根1,崔曙光2,张朝阳3,毛国强4,全智5,Tony Q. S. QUEK6,荣波7

《信息与电子工程前沿(英文)》 2022年 第23卷 第1期   页码 1-4 doi: 10.1631/FITEE.2210000

摘要: With the acceleration of a new round of global scientific, technological, and industrial revolution, the next generation of information and communication technology, i.e., 6G, will inject new momentum into industry transformation and upgrad-ing, as well as into economic innovation and development. This will subsequently promote a global industrial integration. Wireless communication will be ubiquitous in all areas of future society, supporting novel applications with various performance requirements, such as immersive- or interactive-experience applications requiring a large bandwidth, autonomous driving and vehicle-to-everything applications requiring ultra-high reliability and ultra-low latency, and applications for industrial Internet requiring massive machine-type connectivity. Facing the challenges of the post-Moore and post-pandemic era, wireless communication needs breakthroughs in network architecture to improve the intelligence, security, robustness, bandwidth, and heterogeneity. With this background, several important tendencies have emerged in the development of 6G wireless communications: 1. Future wireless networks will evolve from “human-to-human” communications into intelligent “human-to-machine” communications. In addition to enabling communications among humans, future wireless networks will be able to support close connections among humans and machines. The behavior and intent of humans will be sensed and communicated to machines that will accordingly adjust their operations. Typical scenarios include smart building, intelligent transportation, mixed reality (MR), and others. 2. Network nodes will evolve from carrying out only traditional communications to carrying out communication, sensing, computation, management, and caching in an integrated manner. To meet the diverse service requirements of mobile MR, intelligent transportation, industrial Internet of Things, and other areas, future networks will possess multiple functionalities. For example, by sensing human head position, pre-caching necessary content, and rendering high-quality images, network nodes can provide fully immersive MR experiences. In addition, with artificial intelligence (AI), network nodes can manage multi-dimensional resources in an on-demand fashion, where intent-driven network management and control can be realized. 3. Network architecture will focus on collaborations between the cloud and the network edge, which will become more heterogenous. To shorten latency and alleviate the backhaul/fronthaul burden, the network edge must collaborate with the cloud. The first method of collaboration is that the cloud finishes AI model training and then deploys AI models into the network edge, which supports the so-called edge intelligence. In the second method, users demanding high throughput are served via a cloud radio access mode, while users requiring ultra-low latency can benefit from edge computation and caching. As for architecture heterogeneity, future networks are envisioned to incorporate unmanned aerial vehicle (UAV) networks, satellite communica-tion networks, and dense cellular networks, bringing three-dimensional and hierarchical network coverage. In short, the evolution of existing 5G technolo-gies and the development of 6G need to address more stringent and diverse application scenarios, a more strict energy constraint, and the orchestration of multi-dimensional resources. These challenges call for an intellicise wireless network operation paradigm, where “intellicise” is a new adjective that we coin, standing for intelligence-endogenous and primitive-concise. Built upon the integration of AI and next-generation networking technologies, an intellicise wireless network continually explores and exploits new intelligent primitives, e.g., semantic base (Seb) in semantic communications, proactively takes sys-tematic entropy reduction as the global optimization objective, adaptively reshapes the core models of information systems, and ultimately endows itself with endogenous intelligence and primitive conciseness. In this context, the journal has organized a special feature on the theory and techniques for intellicise wireless networks. This special feature covers information theory, architecture design, and intellicise wireless networks for achieving air-space-ground-sea integration, resource management, hardware testbeds and platforms, as well as related applications. In addition, this feature is intended to provide a review of advancements and future research directions in the research field of intellicise wireless networks. After a rigorous review process, six papers have been selected for this feature, including one review article and five research articles.

Microbial responses to combined oxidation and catalysis treatment of 1,4-dioxane and co-contaminants

Newell, Michael S. Wong, Shaily Mahendra

《环境科学与工程前沿(英文)》 2018年 第12卷 第5期 doi: 10.1007/s11783-018-1071-6

摘要:

Groundwater microbial community was altered after catalysis and chemical oxidation.

The coupled treatment train removed 90% 1,4-dioxane regardless of co-contaminants.

Dynamics of microbial populations varied along with different treatment stages.

Many microbial taxa exhibited resilience against oxidative and catalytic treatments.

Metagenomic analysis will be valuable for long-term management of polluted sites.

关键词: Coupled treatments     Chlorinated solvents     Diethylene ether     Biological diversity     Microbial populations     Biomarkers    

灰色预测模型GM()的适用性分析及在火灾风险预测中的应用

陈子锦,王福亮,陆守香

《中国工程科学》 2007年 第9卷 第5期   页码 91-94

摘要:

通过对灰色预测模型———GM()的理论分析,证明了该模型的预测值及其变化趋势均具有单调 性,进而提出了GM()模型的适用性判据,并给出了该判据在火灾风险灰色预测中的应用实例。

关键词: 火灾预测     GM(1     1)模型     火灾伤人率    

标题 作者 时间 类型 操作

基于马尔可夫到达过程的两级可修备件(S-1S)库存优化模型

陈 童,黎 放,狄 鹏

期刊论文

中国的探月工程——中国航天第三个里程碑

栾恩杰

期刊论文

Recovery of free volume in PIM-1 membranes through alcohol vapor treatment

Faiz Almansour, Monica Alberto, Rupesh S. Bhavsar, Xiaolei Fan, Peter M. Budd, Patricia Gorgojo

期刊论文

基于最大密度的小型无人机电机速度估计与故障检测

Jefferson S. SOUZA1,Moises C. BEZERRIL1,Mateus A. SILVA1,Frank C.BRITO1

期刊论文

Determination of growth kinetics of microorganisms linked with 1,4-dioxane degradation in a consortium

期刊论文

Regulatory mechanism and functional analysis of

null

期刊论文

解决一维材料黏附行为的实验方法综述

Mead, Shiliang Wang, Sören Zimmermann, Sergej Fatikow, Han Huang

期刊论文

我国小麦生产应对入世之策略

白选杰

期刊论文

Insight into the role of cholesterol in modulation of morphology and mechanical properties of CHO-K1

Lei Zhang, Lisha Zhao, Ping-Kai Ouyang, Pu Chen

期刊论文

一种满足末端姿态约束的工业机械臂分布式变密度路径搜索与简化方法

王进1,2,厉圣杰1,2,张海运3,陆国栋1,2,冯奕畅1,2,王鹏1,2,李基拓1,2

期刊论文

Effect of biochar amendment on soil’s retention capacity for estrogenic hormones from poultry manure

Sukhjot MANN, Zhiming QI, Shiv O. PRASHER, Lanhai LI, Dongwei GUI, Qianjing JIANG

期刊论文

Modelling the dynamic response of a solid oxide steam electrolyser to transient inputs during renewable hydrogen production

BRANDON, Claire S. ADJIMAN,

期刊论文

智简无线网络理论与技术

张平1,彭木根1,崔曙光2,张朝阳3,毛国强4,全智5,Tony Q. S. QUEK6,荣波7

期刊论文

Microbial responses to combined oxidation and catalysis treatment of 1,4-dioxane and co-contaminants

Newell, Michael S. Wong, Shaily Mahendra

期刊论文

灰色预测模型GM()的适用性分析及在火灾风险预测中的应用

陈子锦,王福亮,陆守香

期刊论文