期刊文献+
共找到99篇文章
< 1 2 5 >
每页显示 20 50 100
物理竞赛辅导中的“制衡”策略
1
作者 王来茂 《安徽教育论坛》 2006年第3期45-45,共1页
“制衡”,是“调制平衡”的意思,这是一种策略或者说是一种思想,大致的意思是:对两个或两个以上的对象加以人为调制,以保持各个对象间实力相对平衡,以求各个对象在竞争的氛围中互相促进,迅速发展。
关键词 物理 竞赛辅导 “制衡”策略 中学
原文传递
“对冲”视阈下安倍内阁对华外交模式探析 被引量:1
2
作者 蔡亮 《华东师范大学学报(哲学社会科学版)》 CSSCI 北大核心 2016年第6期118-124,共7页
基于中日间安全互信缺失和相互依存紧密并存的复杂性,为防范中国对日本的安全"威胁",同时又能避免双边关系陷入激烈对抗而导致日本利益受损,安倍内阁在对华外交中采用了兼具"制衡"与"合作"两种面向的&qu... 基于中日间安全互信缺失和相互依存紧密并存的复杂性,为防范中国对日本的安全"威胁",同时又能避免双边关系陷入激烈对抗而导致日本利益受损,安倍内阁在对华外交中采用了兼具"制衡"与"合作"两种面向的"对冲"模式。"制衡"主要体现为内外制衡加制度制衡,即一方面对内增强日本国防力量建设,对外强化日美同盟,并加强与周边相关国家的安全合作,另一方面借助国际场合对华展开舆论攻势。"合作"主要包括经济务实主义和约束性交往,意指日本应在重视对华经贸合作的同时,借助多渠道对话机制来增进沟通。 展开更多
关键词 “对冲” 安倍内阁 对华外交 “制衡” “合作”
下载PDF
Age-related Changes of Glu/GABA Expression in the Primary Visual Cortex of Cat 被引量:4
3
作者 刁建刚 徐金旺 +2 位作者 李古州 汤传宏 华田苗 《Zoological Research》 CAS CSCD 北大核心 2009年第1期38-44,共7页
Recent studies show that a reduced effect of inhibitory transmitter system in the visual cortex may underlie aged visual function degradation. Whether excitatory transmitter system changes with age and hence affects i... Recent studies show that a reduced effect of inhibitory transmitter system in the visual cortex may underlie aged visual function degradation. Whether excitatory transmitter system changes with age and hence affects intracortical excitation-inhibition balance is not clear. To explore this issue, we used Nissl staining and immunohistochemical methods as well as Image-Pro Express software to examine the density of Nissl-stained neurons, Glutamie acid-immunoreactive (Glu-IR) neurons and T-Aminobutyric acid-immunoreactive (GABA-IR) neurons in the primary visual cortex of young adult and aged cats. The results showed that there was no significant difference in the density of Nissl-stained neurons between young and old cats (2〉0.05). However, the density of Glu-IR neurons and GABA-IR neurons in the primary visual cortex of aged cats was significantly lower than that of young ones (P〈0.01). The ratio between Glu-IR neurons and GABA-IR neurons was significantly increased in old cats compared to that in young adult ones (P〈0.01). These results indicated that the effect of excitatory transmitter system in the old visual cortex was increased relative to the inhibitory transmitter system, which might cause an imbalance between cortical excitation and inhibition and might be an important factor mediating the visual function decline during aging. 展开更多
关键词 Glutamic acid (Glu) γ-Aminobutyric acid (GABA) Balance of excitation and inhibition Aging Primary visual cortex CAT
下载PDF
我国民办高校内部治理的困境与出路——基于美国私立大学的启示
4
作者 张鹏 宫福清 《教育理论与实践》 北大核心 2022年第6期3-7,共5页
内部治理是我国民办高校高质量发展的核心保障。由于政教治理失衡与民主参与失范,我国民办高校内部治理陷入共治弱化的困境。我国民办高校可以借鉴美国私立大学内部治理的经验,采用“分权”与“制衡”强化共同治理来突破内部治理面临的... 内部治理是我国民办高校高质量发展的核心保障。由于政教治理失衡与民主参与失范,我国民办高校内部治理陷入共治弱化的困境。我国民办高校可以借鉴美国私立大学内部治理的经验,采用“分权”与“制衡”强化共同治理来突破内部治理面临的困境,进而优化我国民办高校内部治理结构,提升内部治理能力,推动我国民办高校的高质量发展。 展开更多
关键词 民办高校 内部治理 美国私立大学 “分权” “制衡” 治理结构 治理能力
下载PDF
Effects of Slow-release Fertilizer and Balanced Fertilization on Nitrogen, Phosphorus and Potassium Uptake in Peppers 被引量:1
5
作者 张忠武 王建新 +4 位作者 鲁耀 段宗颜 彭荣珍 周敏 杨景华 《Agricultural Science & Technology》 CAS 2015年第7期1457-1461,共5页
Field plot experiment was conducted to study the effects of two slow-re- lease fertilizers and balanced fertilization on dry matter accumulation, yield, fertilizer use efficiency, nitrogen, phosphorus and potassium up... Field plot experiment was conducted to study the effects of two slow-re- lease fertilizers and balanced fertilization on dry matter accumulation, yield, fertilizer use efficiency, nitrogen, phosphorus and potassium uptake of peppers at Jiangna Town, Yanshan County, Yunnan Province in 2011. The results showed that the dry matter accumulation in dried pepper plant, pepper yield, nitrogen, phosphorus, potassium uptake in peppers were significantly increased in all the fertilizer treat- ments, compared with those in control (no fertilizer). Compared with conventional fertilization, balanced fertilization, slow-release compound fertilizer and slow-release urea fertilizer significantly increased dried pepper economic output by 20.94%, 17.5% and 14.54%, nitrogen uptake in dried peppers by 21.53%,18.46% and 13.19%, phosphorus uptake in dried peppers by 14.08%, 15.76% and 10.44%, potassium uptake in dried peppers by 22.66%, 15.73% and 16.28%; they also in- creased nitrogen and potassium use efficiency, but reduced potassium use efficiency due to the increased potassium addition. In treatments with balanced fertilization, slow-release compound fertilizer and slow-release urea fertilizer, the nitrogen utiliza- tion was 5.84%, 7.14% and 8.33% higher and the phosphorus utilization was 3.32%, 3.27% and 2.47% higher than those in treatment with conventional fertiliza- tion. In addition, the nitrogen application could be reduced by 20%-50% by bal- anced fertilization and the two slow-release fertilizers, thereby reducing environmen- tal pollution. Slow-release fertilizers could also reduce the frequency of fertilization and labor costs. 展开更多
关键词 Slow-release fertilizer Balanced fertilization Dried pepper NPK uptake Fertilizer use efficiency
下载PDF
Wavelet Network Based MQAM Digital Communication Adaptive Equalizers
6
作者 章国安 张小东 毕光国 《Journal of Southeast University(English Edition)》 EI CAS 2000年第1期13-19,共7页
A novel wavelet network based adaptive equalizer (WNBAE) is presented and the structure and stochastic gradient learning algorithm is given. The proposed WNBAE has better performance than that of the conventional lin... A novel wavelet network based adaptive equalizer (WNBAE) is presented and the structure and stochastic gradient learning algorithm is given. The proposed WNBAE has better performance than that of the conventional linear transversal equalizer based on the LMS and the RLS algorithms, as well as that of the decision feedback equalizer based on the RLS algorithm, especially for MQAM digital communication reception systems over the nonlinear channels. In addition, it outperforms the BP neural network based adaptive equalizer slightly. However, it has a slow convergence rate and a high computational complexity. Several simulations are performed to evaluate the behavior of the WNBAE. 展开更多
关键词 wavelet network MQAM adaptive equalizer channel equalization
下载PDF
New atom movement mechanism for tracking path on disordering AuCuI(A_8^(Au)A_4^(Cu)) compound 被引量:3
7
作者 谢佑卿 彭红建 +2 位作者 刘心笔 李小波 聂耀庄 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第10期3221-3256,共36页
Taking experimental path on disordering AuCuI(AAuCu8A4)composed of A Au8 and ACu4 stem alloy genes as an example, three discoveries and a method were presented. The ability of Au Cu I(AAu Cu8 A4)to keep structure ... Taking experimental path on disordering AuCuI(AAuCu8A4)composed of A Au8 and ACu4 stem alloy genes as an example, three discoveries and a method were presented. The ability of Au Cu I(AAu Cu8 A4)to keep structure stabilization against changing temperature is attributed to the fact that the AAu8 and ACu4 potential well depths greatly surpass their vibration energies, which leads to the subequilibrium of experimental path. A new atom movement mechanism of AuCuI(AAuACu84)to change structure for suiting variation in temperature is the resonance activating-synchro alternating of alloy genes, which leads to heterogeneous and successive subequilibrium transitions. There exists jumping order degree, which leads to the existence of jumping Tj-temperature and an unexpected so-called "retro-effect" about jumping temperature retrograde shift to lower temperatures upon the increasing heating rate. A set of subequilibrium holographic network path charts were obtained by the experimental mixed enthalpy path method. 展开更多
关键词 INTERMETALLICS alloy gene order/disorder transformation resonance activating-synchro alternating mechanism thermodynamic properties equilibrium and subequilibrium holographic network path charts
下载PDF
Heat flow balance and control strategies for a large GSHP
8
作者 陈义波 陈九法 +2 位作者 Umberto Berardi 乔未来 陈军伟 《Journal of Southeast University(English Edition)》 EI CAS 2013年第1期92-98,共7页
The possibility of underground imbalance between heat emission and absorption has a negative impact on the performance of ground-source heat pump systems (GSHPs). Numerical and experimental researches were made in a... The possibility of underground imbalance between heat emission and absorption has a negative impact on the performance of ground-source heat pump systems (GSHPs). Numerical and experimental researches were made in a residential building, which is supplied with a GSHP system and a ceiling radiation system combined with a replacement fresh air system. EnergyPlus simulations were used to estimate heating and cooling loads, and to assess the heat generated from the water pump, the fan and the heat pump unit. Then, Fluent simulations were used to compare three different control strategies of handling the underground heat exchange. These simulations were strongly based on an experimentally verified model. It is obtained that a ratio between cooling and heating loads is 5.08 : 1 in a case study in Nanjing. Moreover, the control strategy based on the starting time is more efficient and reliable than the temperature and temperature difference strategies to control the underground heat exchange. 展开更多
关键词 ground-source heat pump system residential building heat balance control strategy
下载PDF
Reliable and Load Balance-Aware Multi-Controller Deployment in SDN 被引量:7
9
作者 Tao Hu Peng Yi +1 位作者 Jianhui Zhang Julong Lan 《China Communications》 SCIE CSCD 2018年第11期184-198,共15页
Software Defined Networking(SDN) provides flexible network management by decoupling control plane and data plane. However, such separation introduces the issues regarding the reliability of the control plane and contr... Software Defined Networking(SDN) provides flexible network management by decoupling control plane and data plane. However, such separation introduces the issues regarding the reliability of the control plane and controller load imbalance in the distributed SDN network, which will cause the low network stability and the poor controller performance. This paper proposes Reliable and Load balance-aware Multi-controller Deployment(RLMD) strategy to address the above problems. Firstly, we establish a multiple-controller network model and define the relevant parameters for RLMD. Then, we design the corresponding algorithms to implement this strategy. By weighing node efficiency and path quality, Controller Placement Selection(CPS) algorithm is introduced to explore the reliable deployments of the controllers. On this basis, we design Multiple Domain Partition(MDP) algorithm to allocate switches for controllers according to node attractability and controller load balancing rate, which could realize the reasonable domain planning. Finally, the simulations show that, compared with the typical strategies, RLMD has the better performance in improving the reliability of the control plane and balancing the distribution of the controller loads. 展开更多
关键词 software defined networking CONTROLLER reliability load balancing networkoptimization
下载PDF
Investigating a potential reservoir landslide and suggesting its treatment using limit-equilibrium and numerical methods 被引量:2
10
作者 Nima BABANOURI Hesam DEHGHANI 《Journal of Mountain Science》 SCIE CSCD 2017年第3期432-441,共10页
A reservoir landslide not only reduces the water storage capacity, but also causes extensive damages to the dam body, power/water transmission lines, roads, and other infrastructures. The Latian Dam, located 35 km nor... A reservoir landslide not only reduces the water storage capacity, but also causes extensive damages to the dam body, power/water transmission lines, roads, and other infrastructures. The Latian Dam, located 35 km north east of Tehran (Iran), is one of the cases which has encountered serious problems with instability of its rock abutments. This paper addresses the stability analysis of the right abutment of the Latian Dam using limit equilibrium and numerical methods. Geomechanical characteristics of the rock abutment were first estimated based on engineering classification of the rock mass. Different search methods were examined for locating the critical circular/non-circular slip surface in conjunction with the general limit equilibrium method. The effect of variabi]ity of rock mass properties, water table, and earthquake load on the factor of safety (FS) and probability of failure (PF) was studied. In the event of rapid drawdown in the reservoir, the limit equilibrium analysis calculated FS=1.067 and PF=21.1%, and the numerical analysis returned FS=1.01. The results of the analyses suggest that the right abutment of the Latian Dam is prone to slide and needs treatment. Investigations demonstrated that a slope reduction by 15° at the upper part of the abutment would meet stability conditions even in the worst-case scenario (FS=1.297 and PF=2.07%). 展开更多
关键词 Reservoir landslide Limit equilibrium Numerical modeling RELIABILITY Slope stabilization
下载PDF
Mechanism of energy limit equilibrium of rock burst in coal mine 被引量:4
11
作者 Wang Jiong Yan Yubiao +2 位作者 Jiang Zhengjun Qi Ping Chen Chen 《Mining Science and Technology》 EI CAS 2011年第2期197-200,共4页
With the increase of mining depth,the effect of rock burst on coal mining is becoming more and more obvious and the rock burst mechanism becomes more and more complicated.Scholars from many countries had put forward d... With the increase of mining depth,the effect of rock burst on coal mining is becoming more and more obvious and the rock burst mechanism becomes more and more complicated.Scholars from many countries had put forward different mechanisms,but no one gave a reasonable explanation to the mechanism of rock burst.In this paper,based on the energy theories,we studied the energy limit equilibrium(ELE) of coal mine rock burst The coal seam with rock burst is divided into energy limit equilibrium zone(ELEZ)(A) and elastic zone(B);we also determined the position where the rock burst occurs,including the roof and floor of coal seams;in addition,we derived the limit width of ELEZ and the mathematic relationship between the limit width and occurrence mechanism of rock burst:the energy difference function(EDF),w(x) = w_j - w_p,because first-order derivative w'(x),is less than 0.So EDF is a monotonically decreasing function.The graph of the energy difference function was also determined, through which we analysed the occurrence mechanism of rock burst. 展开更多
关键词 Rock burst Elastic zone Limit stress Energy limit equilibrium(ELE) Limit energy
下载PDF
A Distributed Decision Mechanism for Controller Load Balancing Based on Switch Migration in SDN 被引量:7
12
作者 Tao Hu Peng Yi +1 位作者 Jianhui Zhang Julong Lan 《China Communications》 SCIE CSCD 2018年第10期129-142,共14页
Software Defined Networking(SDN) provides flexible network management by decoupling control plane from data plane. And multiple controllers are deployed to improve the scalability and reliability of the control plane,... Software Defined Networking(SDN) provides flexible network management by decoupling control plane from data plane. And multiple controllers are deployed to improve the scalability and reliability of the control plane, which could divide the network into several subdomains with separate controllers. However, such deployment introduces a new problem of controller load imbalance due to the dynamic traffic and the static configuration between switches and controllers. To address this issue, this paper proposes a Distribution Decision Mechanism(DDM) based on switch migration in the multiple subdomains SDN network. Firstly, through collecting network information, it constructs distributed migration decision fields based on the controller load condition. Then we choose the migrating switches according to the selection probability, and the target controllers are determined by integrating three network costs, including data collection, switch migration and controller state synchronization. Finally, we set the migrating countdown to achieve the ordered switch migration. Through verifying several evaluation indexes, results show that the proposed mechanism can achieve controller load balancing with better performance. 展开更多
关键词 software defined networking CONTROLLER load balancing switch migration distributed decision
下载PDF
Isothermal extrusion speed curve design for porthole die of hollow aluminium profile based on PID algorithm and finite element simulations 被引量:3
13
作者 Jie YI Zhi-wen LIU Wen-qi ZENG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第7期1939-1950,共12页
The isothermal extrusion process of hollow aluminium profile was investigated using incremental proportional-integral-derivative(PID)control algorithm and finite element simulations.The range of extrusion speed was de... The isothermal extrusion process of hollow aluminium profile was investigated using incremental proportional-integral-derivative(PID)control algorithm and finite element simulations.The range of extrusion speed was determined by considering the maximum extrusion load and production efficiency.By taking the optimal solution temperature of the secondary phase as the target temperature,the extrusion speed–stroke curve for realizing the isothermal extrusion of the aluminium profile was obtained.Results show that in the traditional constant extrusion speed process,the average temperature of the cross-section of the aluminium profile at the die exit rapidly increases and then slowly rises with the increase in ram displacement.As the extrusion speed increases,the temperature difference at the die exit of the profile along the extrusion direction increases.The exit temperature difference between the front and back ends of the extrudate along the extrusion direction obtained by adopting isothermal extrusion is about 6.9℃.Furthermore,the heat generated by plastic deformation and friction during extrusion is balanced with the heat transfer from the workpiece to the container,porthole die and external environment. 展开更多
关键词 isothermal control extrusion speed curve porthole die extrusion PID control heat balance
下载PDF
Effects of topography and vegetation on distribution of rare earth elements in calcareous soils 被引量:1
14
作者 Zhaoliang Song Yuntao Wu +7 位作者 Xiaomin Yang Zijuan Xu Linan Liu Xiaodong Zhang Qian Hao Shaobo Sun Guilin Han Congqiang Liu 《Acta Geochimica》 EI CAS CSCD 2017年第3期469-473,共5页
This study investigated the impact of topography and vegetation on distribution of rare earth elements(REEs)in calcareous soils using methods of single extraction and mass balance calculation. The purposes of the stud... This study investigated the impact of topography and vegetation on distribution of rare earth elements(REEs)in calcareous soils using methods of single extraction and mass balance calculation. The purposes of the study were to set a basis for further research on the biogeochemical REE cycle and to provide references for soil–water conservation and REE-containing fertilizer amendments. The results show a generally flat Post-Archean Average Australian Shale—normalized REE pattern for the studied calcareous soils. REE enrichment varied widely. The proportion of acidsoluble phases of heavy REEs was higher than that of light REEs. From top to bottom of the studied hills, dominant REE sources transitioned from limestone in-situ weathering to input from REE-containing phases(e.g., clay minerals,amorphous iron, REE-containing fluids). Our results indicate that the REE content of calcareous soils is mainly controlled by slope aspect, while the enrichment degree of REEs is related to geomorphological position and vegetation type.Furthermore, the proportion of acid-soluble phases of REEs is mainly controlled by geomorphological position. 展开更多
关键词 REE distribution Weathering and pedogenesis Topography and vegetation Calcareous soils
下载PDF
Research on key technologies in design of middle pylon of Taizhou Bridge 被引量:1
15
作者 Ji Lin 《Engineering Sciences》 EI 2012年第3期2-7,共6页
At the middle pylon of a three-pylon two-span suspension bridge, the effect of unbalanced loads on the adjacent spans may result in a series of technical bottlenecks in design, such as stability and anti-slippage betw... At the middle pylon of a three-pylon two-span suspension bridge, the effect of unbalanced loads on the adjacent spans may result in a series of technical bottlenecks in design, such as stability and anti-slippage between saddles and main cables. This article presents the researches conducted on structure selection and behavior characteristics of middle pylon, interaction mechanism between main cables and saddles and their anti-slippage safety performance, elastic and plastic stability analysis and safety assessment of steel middle pylon, and fatigue design load and method for steel pylon of Taizhou Bridge. According to the research results, a longitudinal inverted Y shape steel middle pylon is used in design, effectively solving many technical difficulties, and this type of pylon has become a suitable middle pylon structural form for many three-ovlon two-soan susoension bridges. 展开更多
关键词 three-pylon two-span suspension bridge structural behavior and selection elastic and plastic stability main cable and saddle anti-slippage
下载PDF
Optimal arrangement for pressure measurement points in working chamber of earth pressure balance shield 被引量:4
16
作者 刘畅 屈福政 +1 位作者 李守巨 孟庆琳 《Journal of Central South University》 SCIE EI CAS 2012年第7期1883-1891,共9页
In order to exactly provide scientific basis for pressure dynamic balance control of working chamber of earth pressure balance shield (EPBS),study on optimal arrangement of pressure measurement points in working chamb... In order to exactly provide scientific basis for pressure dynamic balance control of working chamber of earth pressure balance shield (EPBS),study on optimal arrangement of pressure measurement points in working chamber was conducted. Based on mathematical description of optimal arrangement for pressure measurement points,fuzzy clustering analysis and discriminant analysis were used to divide pressure regions of nodes on bulkhead. Finally,the selection method of optimal measurement points was proposed,and by selecting d6.28 m EPBS as study object,the case study was conducted. By contrast,based on optimal arrangement scheme of pressure measurement points,through adopting weighted algorithm,the absolute error mean of equivalent pressure of working chamber is the smallest. In addition,pressure curve of optimal arrangement points presents parabola,and it can show the state of pressure distribution on bulkhead truly. It is concluded that the optimal arrangement method of pressure measurement points in working chamber is effective and feasible,and the method can provide basis for realizing high precision pressure control of EPBS. 展开更多
关键词 TUNNELING earth pressure balance shield working chamber optimal arrangement discrete element method
下载PDF
Adaptive trajectory tracking control of two-wheeled self-balance robot 被引量:1
17
作者 秦勇 《High Technology Letters》 EI CAS 2009年第1期38-43,共6页
Wheeled mobile robot is one of the well-known nonholonomic systems. A two-wheeled sell-balance robot is taken as the research objective. This paper carried out a detailed force analysis of the robot and established a ... Wheeled mobile robot is one of the well-known nonholonomic systems. A two-wheeled sell-balance robot is taken as the research objective. This paper carried out a detailed force analysis of the robot and established a non-linear dynamics model. An adaptive tracking controller for the kinematic model of a nonhotonomic mobile robot with unknown parameters is also proposed. Using control Lyapunov function (CLF), the controller's global asymptotic stability has been proven. The adaptive trajectory tracking controller decreases the disturbance in the course of tracking control and enhances the real-time control characteristics. The simulation result indicated that the wheeled mobile robot tracking can be effectively controlled. 展开更多
关键词 wheeled mobile robot adaptive control trajectory tracking asymptotic stability
下载PDF
Experimental and simulation study of nylon 6 solid–liquid extraction process
18
作者 Chunxi Qin Jie Tang +2 位作者 Fenglei Bi Zhenhao Xi Ling Zhao 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第5期1022-1030,共9页
The solid–liquid extraction process of nylon 6 to eliminate small molecules, i.e., caprolactam(CL), cyclic dimers(CD) and cyclic trimers(CT), is investigated in detail by both batch extraction experiments and numeric... The solid–liquid extraction process of nylon 6 to eliminate small molecules, i.e., caprolactam(CL), cyclic dimers(CD) and cyclic trimers(CT), is investigated in detail by both batch extraction experiments and numerical simulations. In the batch extraction experiments, due to the small molecules attaching to the polymeric surface, the basic physical mechanism shifts from surface diffusion to internal diffusion as the extraction proceeded. The experimental data are well reproduced by a diffusion model consisting of two distinct steps, characterized as surface diffusion and internal diffusion. Furthermore, based on the established mass transfer mechanism and diffusion model of the two distinct steps, the equilibrium constants and internal diffusion coefficients of CL, CD and CT are acquired. An industrial countercurrent extraction tower is further simulated. It is found that the extraction efficiency of CL can be significantly improved by increasing the temperature at the bottom portion of the tower. The elimination of CD, which can be greatly promoted by a high-concentration CL-water solution, is controlled by mass transfer resistance, whereas the removal of CL is mainly affected by the equilibrium. 展开更多
关键词 Solid-liquid extraction EQUILIBRIUM DIFFUSION Numerical simulation
下载PDF
Production Balance of Ship Erection 被引量:1
19
作者 蒋如宏 谭家华 柳存根 《Journal of Shanghai Jiaotong university(Science)》 EI 2008年第3期357-361,共5页
A network plan model of ship erection was established based on the network planning technology and the work-package breakdown system. The load-oriented production control method was introduced to build up a throughput... A network plan model of ship erection was established based on the network planning technology and the work-package breakdown system. The load-oriented production control method was introduced to build up a throughput diagram model thus it is possible to describe the ship erection process numerically. Based on the digitalized models some cases of production balance of ship erection were studied and three balance indexes were put forward, they are the load balance rate, the input manpower balance rate and the maximum gantry crane operating times. Such an analytic method based on the balance evaluation is the important foundation for digitization and intelligentization of shipyard production management. 展开更多
关键词 shipyard management erection balance network plan throughput diagram evaluation index
下载PDF
Nitrosation Reaction Without Nitrogen Oxide Waste Gas Emission and Its Engineering Practice 被引量:1
20
作者 陈春光 冯亚青 +1 位作者 牛伟玮 陈学玺 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第4期442-446,共5页
The gas-liquid phase equilibrium is used in controlling the nitrosation reaction process. Decomposition of nitrous acid and oxidation side reaction.are suppressed in a closed reaction system. The system pressure is us... The gas-liquid phase equilibrium is used in controlling the nitrosation reaction process. Decomposition of nitrous acid and oxidation side reaction.are suppressed in a closed reaction system. The system pressure is used as the criterion of the end of reaction, avoiding excessive feeding and reducing'the decomposition'of nitrous acid. The head space of the reactor is used as the gas buffer, stabilizing the feeding fluctuations and inhibiting the side reaction, decomposition of nitrous acid. Nitrogen oxide concentration is controlled at the minimum level.Thus the zero release ofnitrogen ox!de waste gas can be achieved without using any absorption process. 展开更多
关键词 nitrosa-tion nitrogen oxides phase equilibrium
下载PDF
上一页 1 2 5 下一页 到第
使用帮助 返回顶部