期刊文献+
共找到486篇文章
< 1 2 25 >
每页显示 20 50 100
Method to determine installing angle of conical point attack pick 被引量:4
1
作者 刘送永 崔新霞 +1 位作者 杜长龙 付林 《Journal of Central South University》 SCIE EI CAS 2011年第6期1994-2000,共7页
In order to obtain the determining method of the installing angle and decrease the performance indices (cutting force and wearing rate) of the pick, the relationships among the installing angles (impact angle, inclina... In order to obtain the determining method of the installing angle and decrease the performance indices (cutting force and wearing rate) of the pick, the relationships among the installing angles (impact angle, inclination angle and the skew angle) were studied, and the static model of installing angles of the pick was built. The relationships among the impact angle, the tip angle of pick and the kinematics parameters of the pick were built, too. Moreover, the mechanic models of the maximum clearance angle and the wearing angle of the pick were set up. To research the relationships of the installing angles and the change law of the wearing angle along with the kinematics parameters, the simulation was done. In order to verify the correctness of the models, the cutting experiments were done by employing two picks with different pick tip angles. The results indicate that, the cutting force is the smallest when the direction of the resultant force of pick follows its axis, and the relationship derived among the installing angles should be satisfied. In addition, to decrease the cutting force and the wearing of the pick, the tip angle of pick should not be larger than the half of the difference between the minimum wearing angle and the impact angle of the pick, and the clearance angle must not be less than zero. 展开更多
关键词 conical point attack pick cutting force installing angle wearing angle clearance angle
下载PDF
Numerical Study of a Novel Procedure for Installing the Tower and Rotor Nacelle Assembly of Offshore Wind Turbines Based on the Inverted Pendulum Principle 被引量:10
2
作者 Wilson Guachamin Acero Zhen Gao Torgeir Moan 《Journal of Marine Science and Application》 CSCD 2017年第3期243-260,共18页
Current installation costs of offshore wind turbines(OWTs) are high and profit margins in the offshore wind energy sector are low, it is thus necessary to develop installation methods that are more efficient and pract... Current installation costs of offshore wind turbines(OWTs) are high and profit margins in the offshore wind energy sector are low, it is thus necessary to develop installation methods that are more efficient and practical. This paper presents a numerical study(based on a global response analysis of marine operations) of a novel procedure for installing the tower and Rotor Nacelle Assemblies(RNAs) on bottom-fixed foundations of OWTs. The installation procedure is based on the inverted pendulum principle. A cargo barge is used to transport the OWT assembly in a horizontal position to the site, and a medium-size Heavy Lift Vessel(HLV) is then employed to lift and up-end the OWT assembly using a special upending frame. The main advantage of this novel procedure is that the need for a huge HLV(in terms of lifting height and capacity) is eliminated. This novel method requires that the cargo barge is in the leeward side of the HLV(which can be positioned with the best heading) during the entire installation. This is to benefit from shielding effects of the HLV on the motions of the cargo barge, so the foundations need to be installed with a specific heading based on wave direction statistics of the site and a typical installation season. Following a systematic approach based on numerical simulations of actual operations, potential critical installation activities, corresponding critical events, and limiting(response) parameters are identified. In addition, operational limits for some of the limiting parameters are established in terms of allowable limits of sea states. Following a preliminary assessment of these operational limits, the duration of the entire operation, the equipment used, and weather-and water depth-sensitivity, this novel procedure is demonstrated to be viable. 展开更多
关键词 offshore wind turbine installation crane vessel shielding effects critical events limiting parameters inverted pendulum allowable sea states
下载PDF
New Technology of Installing the Attached Self-Climbing Tower Steel Gantry Cranes
3
《International English Education Research》 2013年第12期224-228,共5页
The Liujiaxia Bridge is 536 m span steel truss stiffening Girder Bridge, tower with double-column steel concrete slructure, which is the world's largest diameter, the largest steel plate thickness of concrete pylon. ... The Liujiaxia Bridge is 536 m span steel truss stiffening Girder Bridge, tower with double-column steel concrete slructure, which is the world's largest diameter, the largest steel plate thickness of concrete pylon. Sarasota manufactured using standard pipe segment, group fight scene segment piecewise hoisting tower segment perfusion within the micro-expansion concrete construction technology, tower maximum height of 61.5 meters. This paper describes a piecewise Sarasota steel installation, piecewise perfusion within the micro-expansion concrete tower new construction method - attached to a self-climbing tower bridge ganlry crane mounted pylon construction technology of large steel components. Of the "entity attached to the pylon installation of equipment by section climb" design, composition and construction applications are described in detail. 展开更多
关键词 Self-Climbing Tower Steel Structure Attached to the Gantry Crane INSTALLATION Technology
下载PDF
Amplified circularly polarized luminescence of chiral metal-organic frameworks via post-synthetic installing pillars
4
作者 Xue-Zhi Wang Yi-Tong Liu +10 位作者 Chuang-Wei Zhou Bei Wang Dong Luo Mo Xie Meng-Ying Sun Yong-Liang Huang jie Luo Yan Wu Shuixing Zhang Xiao-Ping Zhou Dan Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第10期485-489,共5页
Post-synthetic installation strategy is an effective approach to improve the functions of metal-organic frameworks(MOFs).Herein,a pair of chiral MOFs is successfully constructed through solvothermal subcomponent self-... Post-synthetic installation strategy is an effective approach to improve the functions of metal-organic frameworks(MOFs).Herein,a pair of chiral MOFs is successfully constructed through solvothermal subcomponent self-assembly and exhibit circularly polarized luminescence(CPL).These MOFs contain coordinatively unsaturated Zn sites and channels,which allow the installation of pyridyl-terminated pillars into the original structure.Such a post-synthetic installation process reinforces the MOFs'rigidity and increases the photoluminescence quantum yields(PLQYs).Furthermore,the luminescence dissymmetry factors(glum)of these post-modified MOFs are amplified after installing the pillars.This work provides an appealing strategy for boosting the CPL performance of chiral MOFs. 展开更多
关键词 Chiral metal-organic frameworks Circularlypolarized luminescence Post-synthetic installation Pyridyl-terminated pillars Chirality transfer
原文传递
SCIENCE AND TECHNOLOGY
5
《China Today》 2025年第2期61-61,共1页
The Rudong offshore photovoltaic-hydrogen energy storage project,China’s largest offshore solar-hydrogen farm,began operation on December 31,2024.Located in Rudong,a county in Jiangsu Province in east China,it has a ... The Rudong offshore photovoltaic-hydrogen energy storage project,China’s largest offshore solar-hydrogen farm,began operation on December 31,2024.Located in Rudong,a county in Jiangsu Province in east China,it has a total installed capacity of 400 megawatts. 展开更多
关键词 OFFSHORE Jiangsu installed
下载PDF
Experimental Study on Mooring,Towing and Installing of Immersed Tunnel Caissons 被引量:7
6
作者 肖龙飞 杨建民 李润培 《Journal of Shanghai Jiaotong university(Science)》 EI 2010年第1期103-107,共5页
Mooring,towing and installing tests on immersed tunnel caissons across the Yong River are carried out in basin to investigate the motions and line tensions.In the towing operation,the maximum tension exists in the cas... Mooring,towing and installing tests on immersed tunnel caissons across the Yong River are carried out in basin to investigate the motions and line tensions.In the towing operation,the maximum tension exists in the case that half caisson is exposed to waves and currents.The cooperation of operating manually on many lines at the same time is very difficult and important.The dynamic behavior of the caisson and the line tensions are affected more by the manual operations than by waves and currents.In the installing operation,the tensions of hoisting lines are much larger than the positioning lines. 展开更多
关键词 immersed tunnel CAISSON INSTALLATION model test
原文传递
Energy conservation in China's coal-fired power industry by installing advanced units and organized phasing out backward production 被引量:1
7
作者 Weiliang WANG Junfu LYU +3 位作者 Zheng LI Hai ZHANG Guangxi YUE Weidou NI 《Frontiers in Energy》 SCIE CSCD 2019年第4期798-807,共10页
Coal-fired power is the main power source and the biggest contributor to energy conservation in the past several decades in China.It is generally believed that advanced technology should be counted on for energy conse... Coal-fired power is the main power source and the biggest contributor to energy conservation in the past several decades in China.It is generally believed that advanced technology should be counted on for energy conservation.However,a review of the decline in the national average net coal consumption rate(NCCR)of China's coal-fired power industry along with its development over the past few decades indicates that the upgradation of the national unit capacity structure(including installing advanced production and phasing out backward production)plays a more important role.A quantitative study on the effect of the unit capacity structure upgradation on the decline in the national average NCCR suggests that phasing out backward production is the leading factor for the decline in the NCCR in the past decade,followed by the new installation,whose sum contributes to approximately 80%of the decline in the national average NCCR.The new installation has an effective affecting period of about 8 years,during which it would gradually decline from a relatively high value.Since the effect of phasing out backward production may remain at a certain degree given a continual action of phasing out backward capacity,it is suggested that the organized action of phasing out backward production should be insisted on. 展开更多
关键词 coal-fired power energy conservation net coal consumption rate new installation phasing out backward production unit capacity structure
原文传递
Simulation of Excess Pore Water Pressure During Deep Soil Mixing Columns Installing
8
作者 张俊峰 陈锦剑 王建华 《Journal of Shanghai Jiaotong university(Science)》 EI 2012年第4期401-407,共7页
Most of current studies of deep soil mixing (DSM) methods are focused on the soil strength improvement and soil treatment effectiveness. But the DSM installation leads to excess pore water pressure and soil disturbanc... Most of current studies of deep soil mixing (DSM) methods are focused on the soil strength improvement and soil treatment effectiveness. But the DSM installation leads to excess pore water pressure and soil disturbance, which will bring great harm to adjacent structures, such as shell tunnels and historic buildings. The procedure of excess pore water pressure buildup while large number DSM columns are installed is complicated. In order to find methods to predict and simulate the excess pore water pressure during DSM column installation, the complicated dissipation and buildup of excess pore water pressure through in-situ test are studied in this paper. In-situ test was conducted in soft clay near the Huangpu River in Shanghai. The pore water pressure was investigated by an automatic monitoring system. Test results indicate that the excess pore water pressure induced by one DSM column installation is composed of the compaction pressure and the reversing pressure. The empirical equations of excess pore water pressure dissipation and buildup were built by mathematical fitting methods. A compound method is proposed to simulate the excess pore water pressure due to DSM installation. Using this method to predict the excess pore water pressure in the situ test, results show a well agreement between the prediction and the measurements. 展开更多
关键词 deep soil mixing (DSM) INSTALLATION in-situ test SIMULATION excess pore water pressure PREDICTION
原文传递
BIGGER,BOLDER,BETTER?The Trials and Tribulations of Installing Large-Scale Artworks
9
作者 Bryan Grogan 《城市漫步(上海版、英文)》 2019年第3期40-41,共2页
In the immediate aftermath of the first Taipei Dangdai Art Festival,images of a massive installation titled'RAWS:HOLIDAY'were beamed around the world,and many began to hypothesize about the potential for Taipe... In the immediate aftermath of the first Taipei Dangdai Art Festival,images of a massive installation titled'RAWS:HOLIDAY'were beamed around the world,and many began to hypothesize about the potential for Taipei's art market to develop in the same way that Hong Kong's has.With the opening of H Queen's in Hong Kong,the region has seen an influx of famed inteniational galleries. 展开更多
关键词 MASSIVE INSTALLATION QUEEN
原文传递
Experimental Study on the Sinking and Leveling of A Large-Capacity Offshore Wind Turbine Five-Bucket Foundation in Sand
10
作者 LIAN Ji-jian ZHU Hang +2 位作者 GUO Yao-hua WANG Hai-jun YU Tong-shun 《China Ocean Engineering》 SCIE EI CSCD 2024年第4期586-601,共16页
As offshore wind farms expand into deeper and farther ocean regions and the unit capacity of offshore wind turbines(OWTs)increases,there is a pressing need for a new foundation structure that can accommodate deep-sea ... As offshore wind farms expand into deeper and farther ocean regions and the unit capacity of offshore wind turbines(OWTs)increases,there is a pressing need for a new foundation structure that can accommodate deep-sea conditions and support large capacities while maintaining economical and safe.To meet this goal of integrated transportation and one-step installation,a novel five-bucket jacket foundation(FBJF),with its suction installation and leveling methods in sand,has been proposed,analyzed and experimentally studied.First,seepage failure experiments of the FBJF at various depths were conducted,and a formula for calculating the critical suction of seepage failure suitable for the FBJF in sand was chosen and recommended for use with a range of values for the permeability coefficient ratio.Second,through leveling experiments of the FBJF at different depths,the maximum adjustable leveling angle during the sinking process was defined using seepage failure and the adjustable leveling angle of the foundation as control criteria.Various leveling control strategies were proposed and verified.Finally,an automatic sinking and leveling control system for the FBJF was developed and experimentally verified for feasibility. 展开更多
关键词 offshore wind turbine(OWT) bucket foundation seepage failure suction installation
下载PDF
Simplified prediction models for acoustic installation effects of train-mounted equipment
11
作者 David Thompson Dong Zhao Giacomo Squicciarini 《Railway Engineering Science》 EI 2024年第2期125-143,共19页
Acoustic models of railway vehicles in standstill and pass-by conditions can be used as part of a virtual certification process for new trains.For each piece of auxiliary equipment,the sound power measured on a test b... Acoustic models of railway vehicles in standstill and pass-by conditions can be used as part of a virtual certification process for new trains.For each piece of auxiliary equipment,the sound power measured on a test bench is combined with meas-ured or predicted transfer functions.It is important,however,to allow for installation effects due to shielding by fairings or the train body.In the current work,fast-running analytical models are developed to determine these installation effects.The model for roof-mounted sources takes account of diffraction at the corner of the train body or fairing,using a barrier model.For equipment mounted under the train,the acoustic propagation from the sides of the source is based on free-field Green’s functions.The bottom surfaces are assumed to radiate initially into a cavity under the train,which is modelled with a simple diffuse field approach.The sound emitted from the gaps at the side of the cavity is then assumed to propagate to the receivers according to free-field Green’s functions.Results show good agreement with a 2.5D boundary element model and with measurements.Modelling uncertainty and parametric uncertainty are evaluated.The largest variability occurs due to the height and impedance of the ground,especially for a low receiver.This leads to standard deviations of up to 4 dB at low frequencies.For the roof-mounted sources,uncertainty over the location of the corner used in the equivalent barrier model can also lead to large standard deviations. 展开更多
关键词 Train noise Auxiliary equipment Acoustic installation effects Virtual certification UNCERTAINTY
下载PDF
The Peaceland Foundation Visits Cambodia
12
《International Understanding》 2024年第2期59-59,共1页
Recently,a delegation of the Peaceland Foundation,a Chinese CSO based in Beijing,together with representatives from Sany Foundation and corporate partners visited Cambodia for a project inspection.They held friendly t... Recently,a delegation of the Peaceland Foundation,a Chinese CSO based in Beijing,together with representatives from Sany Foundation and corporate partners visited Cambodia for a project inspection.They held friendly talks with their Cambodian counterparts on such topics as strengthening the mine clearance techniques of officials at the Cambodian Mine Action Centre(CMAC),installing new equipment,and conducting exchanges and training activities on drones. 展开更多
关键词 PEACE DELEGATION INSTALL
下载PDF
Engineering and Physical Bases of Development and Creation of Plasmochemical Reactors for Mobile Facilities for Medical Waste Disposal
13
作者 Volodymyr Vashchenko Iryna Korduba +2 位作者 Nancy Mahmoud Al Saeed Hafez Nazarii Nehoda Serhii Tsybytovskyi 《Open Journal of Ecology》 2024年第9期651-662,共12页
This paper presents the results of the development and creation of plasma-chemical reactors for mobile and stationary installations for the destruction and disposal of solid, liquid, gaseous and mixed medical waste ba... This paper presents the results of the development and creation of plasma-chemical reactors for mobile and stationary installations for the destruction and disposal of solid, liquid, gaseous and mixed medical waste based on the domestic plasma generator PUN-1, with air as the plasma-forming gas. The design and principle of operation of plasma-chemical reactors installed on mobile experimental and industrial plants “Plazmon-1,2,3”, as well as the main features of the plasma waste disposal process are described. 展开更多
关键词 Medical Waste INCINERATION Plasma Chemical Reactor Plasma Generator Mobile Installations
下载PDF
Chinese Economy Scales New Heights
14
作者 XU GANG 《China Today》 2024年第4期26-30,共5页
The positive figures of last year confirm the strength,resilience,and prospects of the Chinese economy.CHINA’S government work report delivered to the 2024“Two Sessions”in early March released some important statis... The positive figures of last year confirm the strength,resilience,and prospects of the Chinese economy.CHINA’S government work report delivered to the 2024“Two Sessions”in early March released some important statistics.The GDP surpassed RMB 126 trillion,an increase of 5.2 percent.A total of 12.44 million urban jobs were added,and the average surveyed urban unemployment rate stood at 5.2 percent by average.The consumer price index(CPI)rose by 0.2 percent.The production and sales of new-energy vehicles accounted for over 60 percent of the world’s total.Grain output hit a record high of 695 million tonnes.The installed renewable energy capacity surpassed its thermal power for the first time in Chinese history,accounting for over half of newly installed renewable energy capacity worldwide.The per capita disposable income of residents also rose by 6.1 percent nationwide. 展开更多
关键词 INCOME NATIONWIDE installed
下载PDF
Digital Twins:A New Model for Urban Governance
15
作者 Guo Xixian 《China Report ASEAN》 2024年第2期58-61,共4页
Avivid three-dimensional rendering of a bridge appeared on the intelligent monitor and evaluation platform at Beijing Yunlu Technology Co.,Ltd.,pointing to key factors of bridge health.Real-time status,events,transpor... Avivid three-dimensional rendering of a bridge appeared on the intelligent monitor and evaluation platform at Beijing Yunlu Technology Co.,Ltd.,pointing to key factors of bridge health.Real-time status,events,transportation navigation,and traffic conditions were all tracked on the screen.Numerous sensors installed on bridge track every minor dynamic change on the bridge surface and perform digital analysis. 展开更多
关键词 analysis. RENDERING installed
下载PDF
Speeds Up the Construction of a New Power System
16
作者 Zhang Li 《China's Foreign Trade》 2024年第2期51-53,共3页
"In 2023,China's photovoltaic industry continued to maintain a rapid development momentum,with an additional installed capacity of more than 216 GW,accounting for more than half of the global total.The cumula... "In 2023,China's photovoltaic industry continued to maintain a rapid development momentum,with an additional installed capacity of more than 216 GW,accounting for more than half of the global total.The cumulative installed capacity is close to 610 GW,which helps the installed capacity of renewable energy surpass that of thermal power historically.In 2023,the output value of the domestic photovoltaic manufacturing industry exceeded RMB1.75 trillion,a year-on-year increase of 17.1%,and the output of the four main industrial chains of polysilicon. 展开更多
关键词 MAINTAIN continued installed
下载PDF
Translation Theory and Techniques in Optometry Literature: A Case Study of the “Optoform 80 Installation and Maintenance Manual”
17
作者 JIANG Fangzhou 《Sino-US English Teaching》 2024年第2期94-97,共4页
Translation of specialized documents in optometry presents unique challenges,requiring a deep understanding of the professional context,terminology,and adherence to specific translation styles.This paper delves into t... Translation of specialized documents in optometry presents unique challenges,requiring a deep understanding of the professional context,terminology,and adherence to specific translation styles.This paper delves into the translation theory and techniques employed in the English-to-Chinese translation of the“Optoform 80 Installation and Maintenance Manual”,serving as a case study.Emphasizing Nida’s theory of functional equivalence,the paper explores the complexities of translating professional optometry literature,focusing on key points and common issues in translating installation and maintenance manuals for optometric devices.Special attention is given to the translation of professional terminology,employing methods such as addition,omission,conversion,and repetition.The translation process aims to meet specific requirements,ensuring accuracy and coherence while aligning with Chinese language conventions.The paper also analyzes translation methods and techniques concerning terminology,prepositions,conjunctions,and handling parallel elements based on practical insights from the Optoform 80 Manual. 展开更多
关键词 optometry translation functional equivalence installation and maintenance manual translation
下载PDF
Construction Safety Management of Mechanical and Electrical Installation Projects
18
作者 Honglou Chi 《Journal of Architectural Research and Development》 2024年第2期50-54,共5页
Various industries today rely on the support of electromechanical equipment,expanding its scope of application and leading to an increase in electromechanical installation projects.However,due to the high level of exp... Various industries today rely on the support of electromechanical equipment,expanding its scope of application and leading to an increase in electromechanical installation projects.However,due to the high level of expertise required and the potential risks involved,it is crucial to emphasize safety management during construction.This paper delves into the significance of construction safety management for electromechanical installation projects,identifies common problems encountered during construction,and proposes solutions.This analysis aims to provide relevant personnel with essential guidance and references for managing electromechanical installation projects safely. 展开更多
关键词 Construction safety Mechanical and electrical installation Installation engineering Engineering projects Safety management
下载PDF
Return to Reality:Speculative Design of Interaction Ritual Chains and Exploration of Alone Together
19
作者 Chuwen Xu 《Journal of Contemporary Educational Research》 2024年第5期263-269,共7页
“Alone together”is an ever-changing“wicked problem.”In this research and practice,the author tries to combine experience design,referring to the theory of“interaction ritual chain theory,”and creatively add inte... “Alone together”is an ever-changing“wicked problem.”In this research and practice,the author tries to combine experience design,referring to the theory of“interaction ritual chain theory,”and creatively add interactive experience to discursive works,so that the audience can think between the real and the virtual. 展开更多
关键词 Speculative design Interaction ritual chain Alone together Installation art
下载PDF
New Quality,Great Potential
20
作者 XU GANG 《ChinAfrica》 2024年第4期18-21,共4页
Here are some of the achievements China made in 2023:GDP exceeded 126 trillion yuan($17.43 trillion)with a growth of 5.2 percent;12.44 million new urban jobs were created;average surveyed unemployment rate in urban ar... Here are some of the achievements China made in 2023:GDP exceeded 126 trillion yuan($17.43 trillion)with a growth of 5.2 percent;12.44 million new urban jobs were created;average surveyed unemployment rate in urban areas was 5.2 percent;consumer price index increased by 0.2 percent;new energy vehicle production and sales accounted for more than 60 percent of the global share;grain output reached a record high of 695 billion kg;installed renewable energy capacity surpassed thermal power capacity for the first time in history,and China accounted for over half of newly installed renewable energy capacity worldwide;per-capita disposable income of residents increased by 6.1 percent… 展开更多
关键词 INCOME installed GREAT
下载PDF
上一页 1 2 25 下一页 到第
使用帮助 返回顶部