Dewatering Efficiency Comparison between Vacuum Tube Well and Normal Tube Well in Silty Clay Layer

2012 ◽  
Vol 170-173 ◽  
pp. 41-45
Author(s):  
Zhi Guang Li ◽  
Jian Ma ◽  
Yong Jian Cao ◽  
Bai Qing Xu
Keyword(s):  
High Efficiency ◽  
Silty Clay ◽  
Land Settlement ◽  
Vacuum Tube ◽  
Surrounding Environment ◽  
Water Output ◽  
Normal Tube ◽  
Tube Well ◽  
Efficiency Comparison ◽  
Vacuum Dewatering

Vacuum Tube Well Dewatering (VTWD) is one of high efficiency methods to vacuum dewatering in Beijing district in recent years. Water output, surrounding drawdown, and land settlement of vacuum and normal tube well respectively were measured during the process of engineering dewatering at three sites in Beijing subway engineering. The results showed that the water output by VTWD was 1.6 to 2 times than that by Normal Tube Well Dewatering (NTWD) while the land settlement was twice compared to NTWD. It is suggested to consider the carrying capacity of surrounding environment when using VTWD.

scholarly journals High-Efficiency Simulation Framework to Analyze the Impact of Exhaust Air from COVID-19 Temporary Hospitals and its Typical Applications

2020 ◽  
Vol 10 (11) ◽  
pp. 3949 ◽  
Author(s):  
Donglian Gu ◽  
Zhe Zheng ◽  
Pengju Zhao ◽  
Linlin Xie ◽  
Zhen Xu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Adverse Impact ◽  
Simulation Framework ◽  
Levels Of Detail ◽  
Surrounding Environment ◽  
Building Information ◽  
Simulation Results ◽  
Medical Infrastructure ◽  
The Impact ◽  
Different Levels

The outbreak of COVID-19 resulted in severe pressure on the existing medical infrastructure in China. Several Chinese cities began to construct temporary hospitals for the centralized treatment of COVID-19 patients. The harmful exhaust air from the outlets of these hospitals may have a significant adverse impact on the fresh-air intakes and surrounding environment. Owing to the need to rapidly construct these hospitals within 6–10 days, just a few hours are allowed for the analysis of the impact of this exhaust air on the environment. To overcome this difficulty, a high-efficiency simulation framework is proposed in this study. Based on the open-source computational fluid dynamics software, FDS, the proposed framework is adaptive and incorporates building information with different levels of detail during various design phases of the hospital, and has been applied in the design of the Wuhan Huoshenshan Hospital, the first typical COVID-19 temporary hospital in China. According to the simulation results, neither the fresh-air intakes nor the surrounding buildings would be polluted by the harmful air discharged from the air outlets of the Huoshenshan hospital. The proposed simulation framework can provide a reference for the design and overall planning of similar hospitals in China and other affected countries.

Bifunctional Nanoparticles as a Recyclable Fluorescent Sensor for pH and Cu2+ Detection and Removal of Heavy Metal Ions

NANO ◽  
2020 ◽  
Vol 15 (04) ◽  
pp. 2050048
Author(s):  
Yong Qian ◽  
Xiangfu Meng ◽  
Hongji Liu ◽  
Xingyu Wang ◽  
Hui Wang
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal Ions ◽  
High Efficiency ◽  
Fluorescent Sensor ◽  
High Sensitivity ◽  
Label Free ◽  
Practical Applications ◽  
Surrounding Environment ◽  
Label Free Detection ◽  
Recyclable Adsorbent

Magnetic and fluorescent-based sensors have demonstrated widely applications due to their easily recycle and quickly optical response. However, the complex synthesis and weaker function of these sensors limit their practical applications. Herein, an unmodified, magnetic-functionalized carbon dots-based fluorescent sensor has been developed for label-free detection of pH and Cu[Formula: see text] with high sensitivity. The sensors can not only reversibly quench and recover the fluorescence signals in response to the variation of surrounding environment including pH and Cu[Formula: see text], but also be used as a high-efficiency recyclable adsorbent for removing Cu[Formula: see text], Hg[Formula: see text], Cr[Formula: see text] and Pb[Formula: see text] from aqueous solution.

The Technology of High Efficiency Water Purification

2014 ◽  
Vol 1052 ◽  
pp. 574-577
Author(s):  
Wan Jun Fu
Keyword(s):  
Water Purification ◽  
Power Plants ◽  
High Efficiency ◽  
Oil Field ◽  
Water Filtration ◽  
Technical Equipment ◽  
Filtration Equipment ◽  
Reduction Efficiency ◽  
Equipment Development ◽  
Efficiency Comparison

A new promising water purification technology, soft fiber wadding filter, was introduced in this article. The technology has the advantages of energy saving and emission reduction efficiency greatly, is currently the most advanced water purification. This paper explains the structure of the technical equipment, tell the filtration principle, provides the filter parameters of practical efficiency, comparison. The technology is mainly used in power plants, metallurgy, chemical industry, oil field water treatment engineering, and achieved satisfactory results. Significance of the research on the model of water filtration equipment development and filtration theory is grearly.

scholarly journals Comparison between Phase-Shift Full-Bridge Converters with Noncoupled and Coupled Current-Doubler Rectifier

2013 ◽  
Vol 2013 ◽  
pp. 1-11
Author(s):  
Cheng-Tao Tsai ◽  
Jye-Chau Su ◽  
Sheng-Yu Tseng
Keyword(s):  
Phase Shift ◽  
High Efficiency ◽  
Load Condition ◽  
Duty Ratio ◽  
The Common ◽  
Step Down ◽  
Efficiency Comparison ◽  
Voltage Conversion ◽  
Study Performance ◽  
Current Ripple

This paper presents comparison between phase-shift full-bridge converters with noncoupled and coupled current-doubler rectifier. In high current capability and high step-down voltage conversion, a phase-shift full-bridge converter with a conventional current-doubler rectifier has the common limitations of extremely low duty ratio and high component stresses. To overcome these limitations, a phase-shift full-bridge converter with a noncoupled current-doubler rectifier (NCDR) or a coupled current-doubler rectifier (CCDR) is, respectively, proposed and implemented. In this study, performance analysis and efficiency obtained from a 500 W phase-shift full-bridge converter with two improved current-doubler rectifiers are presented and compared. From their prototypes, experimental results have verified that the phase-shift full-bridge converter with NCDR has optimal duty ratio, lower component stresses, and output current ripple. In component count and efficiency comparison, CCDR has fewer components and higher efficiency at full load condition. For small size and high efficiency requirements, CCDR is relatively suitable for high step-down voltage and high efficiency applications.

Advances in Drainage Consolidation Theory of Soft Ground

2015 ◽  
Vol 744-746 ◽  
pp. 417-421
Author(s):  
Bin Bin Xu
Keyword(s):  
Bearing Capacity ◽  
High Efficiency ◽  
Low Cost ◽  
Ground Improvement ◽  
Time Sequence ◽  
Soft Ground ◽  
Silty Clay ◽  
Popular Method ◽  
The Poor ◽  
Surcharge Preloading

The soft ground including the mud, muddy clay, silty clay etc. is widely distributed in the coastal areas of China. Due to the poor permeability and low bearing capacity, ground improvement is usually necessary before construction. Owe to the low cost and high efficiency, the drainage consolidation methods including surcharge preloading and vacuum preloading methods are the most popular method for the improvement of the soft ground. The consolidation theories are introduced according to the time sequence and the emphasis is put on the radial consolidation theories considering the smear effect and the well resistance.

scholarly journals A case study of vacuum tube-well dewatering technology for improving deep soft soil in Yangtze River floodplain

2021 ◽  
Vol 80 (17) ◽  
Author(s):  
Biao Zeng ◽  
Yu Zhen ◽  
Dingwen Zhang ◽  
Tao Meng ◽  
Zejia Gong ◽  
...  
Keyword(s):  
Yangtze River ◽  
Soft Soil ◽  
Vacuum Tube ◽  
River Floodplain ◽  
Tube Well ◽  
Deep Soft Soil

Smart Ultra Low Power Energy Harvesting System

2013 ◽  
Vol 4 (3) ◽  
pp. 102-118
Author(s):  
Alexandre L. Correia ◽  
José M. Catela ◽  
Moisés S. Piedade ◽  
Rui M. Rocha
Keyword(s):  
Energy Harvesting ◽  
Power Supply ◽  
High Efficiency ◽  
Energy Resources ◽  
Energy Sources ◽  
Ultra Low Power ◽  
Surrounding Environment ◽  
Energy Harvesting System ◽  
Reference Implementation ◽  
Novel Design

Small embedded systems operating in unattended conditions do need to be perpetually powered if a truly pervasive paradigm is envisaged. Harvesting energy from the surrounding environment seems to be the best option. For that, a set of systems has been proposed featuring interesting solutions but not yet capable of overcoming some issues like performance and flexibility. The authors propose a novel design for an environmental energy harvesting power supply that not only can work with multiple energy sources but also can extract the maximum possible energy from them. Additionally, it can provide important information concerning the energy resources of the system. Focusing particularly on the system’s design, the authors present results from a reference implementation that highlight the low wasted power and high efficiency characteristics of the system.

A High Efficiency Vacuum Tube Oscillating Circuit

1924 ◽  
Vol 12 (5) ◽  
pp. 623-650 ◽  
Author(s):  
D.C. Prince ◽  
F.B. Vogdes
Keyword(s):  
High Efficiency ◽  
Vacuum Tube

scholarly journals A Case Study of Vacuum Tube-Well Dewatering Technology for Improving Deep Soft Soil in Yangtze River Floodplain

2021 ◽  
Author(s):  
Biao Zeng ◽  
Yu Zhen ◽  
Dingwen Zhang ◽  
Tao Meng ◽  
Zejia Gong ◽  
...  
Keyword(s):  
Yangtze River ◽  
Water Pressure ◽  
Ground Improvement ◽  
Soft Soil ◽  
Test Site ◽  
Engineering Properties ◽  
Vacuum Tube ◽  
River Floodplain ◽  
Tube Well ◽  
Deep Soft Soil

Abstract Deep soft soil of the Yangtze River floodplain in Nanjing has a special interlayer structure, which provides favorable conditions for the application of vacuum tube-well dewatering technology. This paper focuses on the design, construction and treatment effect of vacuum tube-well dewatering technology. The hydrological parameters and the hydraulic connections between the various layers of the site have been ascertained through two simple single-well multi-holes pumping tests. Moreover, the layout of vacuum tube-wells and depressurization wells in a test site with 84m length and 84m width was designed based on the above parameters. Field tests of vacuum tube-well dewatering technology were conducted on the test site. And the changes of groundwater level, ground settlement and pore water pressure during the test was monitored. The CPTU test technology was used to quickly evaluate the engineering properties of the site before and after treatment. Finally, combined with the settlement monitoring data, the hyperbolic method was used to predict the final settlement. The results indicated that consolidation efficiency of vacuum tube-well dewatering technology has obvious advantages. Implications of this study can provide a reference for the construction design of the site's ground improvement consolidation and other similar projects.

scholarly journals The design of auto-tuning capacitive power transfer for rotary applications using phased-locked-loop

2019 ◽  
Vol 10 (1) ◽  
pp. 307
Author(s):  
N. Nabila ◽  
Shakir Saat ◽  
Y. Yusop ◽  
M.S. M Isa ◽  
A.A. Basari
Keyword(s):  
High Frequency ◽  
Power Efficiency ◽  
High Efficiency ◽  
Plate Thickness ◽  
Industrial Applications ◽  
Power Transfer ◽  
Wireless Power ◽  
Surrounding Environment ◽  
Self Tuning ◽  
Tuning Circuit

<span>Wireless power transfer (WPT), through the transmission of contactless energy, is not only being used for charging batteries in smartphones, but it is also being increasingly used in the field of industrial applications. The capacitive based approach is utilized in this paper because of its ability to transmit power in a metal surrounding environment where the inductive-based approach failed to perform. This work focuses on the coupling study of a rotary CPT application where the power supply is stationary while the load rotates and therefore allows the load to rotate 360<sup>o</sup> free rotation. The Class E MOSFET power inverter is used here due to its ability to achieve high efficiency compared to other class of converters at high frequency. The prototype of the CPT for rotary application has also been successfully developed with disk plate thickness of 1mm-2mm. Overall, the developed CPT system for rotary application is able to deliver 5.5Watt with 83.33% efficiency. To enhance the power efficiency and ZVS conditions, a self-tuning circuit using phased-locked-loop has been proposed in this paper. The efficiency of the developed system with self-tuning circuit is increased to 97.%.</span>

Sign in / Sign up

Export Citation Format

Share Document