Mechanism and Theoretical Calculations of Buttress Anti-Slide Pile

2013 ◽  
Vol 671-674 ◽  
pp. 713-717
Author(s):  
Xin Xing Wu ◽  
Ying Fa Lu ◽  
Xu Dong Fu
Keyword(s):  
Theoretical Calculation ◽  
Stress Condition ◽  
High Efficiency ◽  
Theoretical Calculations ◽  
Good Effect ◽  
Calculation Formula ◽  
Subgrade Reaction ◽  
Sliding Control

Anti-slide pile was widely used in the slope-sliding control，based on the traditional Anti-slide pile, a kind of high efficiency and good effect new slope anti-slide pile-Buttress Anti-slide Pile-was put forward,which changed the cantilever stress condition and the mechanism of depending entirely on lateral subgrade reaction to balance the landslide thrust of the traditional anti-slide pile, and the theoretical calculation formula is deduced.

scholarly journals Characteristics Analysis and Modelling of a Pneumatic Underwater Launching System

2018 ◽  
Vol 232 ◽  
pp. 02005
Author(s):  
Bin Li ◽  
Song Guo ◽  
Wei Li ◽  
Deman Zhang ◽  
Nei Wang
Keyword(s):  
Theoretical Calculation ◽  
Calculation Formula ◽  
Numerical Work ◽  
Characteristics Analysis ◽  
Hydrodynamic Noise

Comprehensive characteristics of a pneumatic underwater launching system were analyzed and the simulation was carried out by simulink. The components of the pneumatic underwater launching system were introduced, and the theoretical calculation formula for the system was derived. A rated pressure of 3.5MPa and 5MPa was offered in the numerical work. Analyses in different piston height show good behaviors: Proper increase of piston-initial accumulator pressure is beneficial to reduce hydrodynamic noise, choose the appropriate pressure of accumulator. The hydrodynamic noise of the system can be significantly reduced by optimizing the structure of the double-acting cylinder, increasing the height of the piston and improving the structure of the piston.

Research on New Technology to Control Highway Semi-Rigid Base Asphalt Pavement Cracks

2011 ◽  
Vol 194-196 ◽  
pp. 1632-1638
Author(s):  
Hong Liang Deng ◽  
Xiao Yin Fu ◽  
Wen Xue Gao ◽  
Ting Ting Ni ◽  
Kai Jiang Chen
Keyword(s):  
Composite Materials ◽  
Theoretical Calculations ◽  
Asphalt Pavement ◽  
New Technology ◽  
Service Level ◽  
Self Control ◽  
Good Effect ◽  
Rigid Base ◽  
The Road ◽  
Absorbing Layer

The methods of controlling Highway semi-rigid base asphalt pavement cracks and other diseases are always hot fields of road engineering and academic circles. The existing methods are on some degree efficient on delaying the formation and extension of cracks, but the effect is limited with different methods and various mechanisms of preventing cracks. Base on force analysis of pavement, this article presents a new technology of crack controlling which uses intelligent composite materials interlayer. By adding a stress absorbing layer between the asphalt surface layers or the semi-rigid base layers with low modulus, good toughness, self-adaptability and self-control ability, the intelligent composite materials interlayer has a good effect on controlling cracks which has been proved by the theoretical calculations and experimental analysis. As a result, the intelligent composite materials interlayer could efficiently prevent and delay the formation and extension of cracks, the safety and comfort of highway could be improved significantly while the cost of construction and maintenance decreasing. And the service level and social image of the road could also be improved effectively. This research has important academic and application value.

scholarly journals Polyacrylonitrile/Crown Ether Composite Nanofibres With High Efficiency for Adsorbing Li(I): Experiments and Theoretical Calculations

2021 ◽  
Vol 9 ◽  
Author(s):  
Tao Ding ◽  
Qian Wu ◽  
Mianping Zheng ◽  
Zhen Nie ◽  
Min Li ◽  
...  
Keyword(s):  
Crown Ether ◽  
Adsorption Capacity ◽  
Photoelectron Spectroscopy ◽  
Density Functional ◽  
High Efficiency ◽  
Theoretical Calculations ◽  
Salt Lakes ◽  
Maximum Adsorption Capacity ◽  
Chemical Grafting ◽  
Epoxy Groups

Lithium, as the lightest alkali metal, is widely used in military and new energy applications. With the rapid growth in demand for lithium resources, it has become necessary to improve the effectiveness of extraction thereof. By using chemical grafting and electrospinning techniques, nanofibres containing crown ether were developed for adsorbing Li(I) from the brine in salt lakes, so as to selectively adsorb Li(I) on the premise of retaining specific vacancies of epoxy groups in crown ether. In lithium-containing solution, the adsorbing materials can reach adsorption equilibrium within three hours, and the maximum adsorption capacity is 4.8 mg g−1. The adsorption mechanisms of the adsorbing materials for Li(I) were revealed by combining Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) with density functional theory (DFT) calculation. The results indicated that in crown ether, O in epoxy groups was coordinated with Li(I) to form Li–O and four O atoms in the epoxy groups were used as electron donors. After coordination, two O atoms protruded from the plane and formed a tetrahedral structure with Li(I), realising the specific capture of Li(I). By desorbing fibres that adsorbed Li(I) with 0.5-M HCl, the adsorption capacity only decreased by 10.4% after five cycles, proving ability to regenerate such materials. The nanofibres containing crown ether synthesised by chemical grafting and electrospinning have the potential to be used in extracting lithium resources from the brine in salt lakes.

The Analysis of Recommendation Method in EC Based on Interest Association Rule

2013 ◽  
Vol 291-294 ◽  
pp. 2798-2801 ◽  
Author(s):  
Yu Zhen Wang
Keyword(s):  
Electronic Commerce ◽  
Business Process ◽  
Association Rule ◽  
High Efficiency ◽  
Low Cost ◽  
Personalized Recommendation ◽  
Good Effect ◽  
Related Information

Electronic commerce is growing rapidly in popularity because of its high efficiency, convenience and low cost. However, E-businesses need more in-time and correct related information about customer in order to provide the service of specific aim on business process. The service of specific aim is very important for e-business to attract new customer and maintain steady customer. The recommendation method based on interest association rule in EC proposed in this thesis can predict the interest of customer according to the analysis the customer’s interest to do personalized recommendation. The recommendation method can improve recommendation level with the clear aim to get good effect.

scholarly journals Design of Boradecarboxylation Reaction

2020 ◽  
Author(s):  
Yuji Naruse ◽  
Atsushi Takamori ◽  
Kenji Oda
Keyword(s):  
Double Bond ◽  
Theoretical Calculation ◽  
Polar Solvent ◽  
Theoretical Calculations ◽  
Lone Pair ◽  
Carbonyl Groups ◽  
Orbital Theory ◽  
Enol Ethers ◽  
Decarboxylation Reaction ◽  
Boat Form

For mechanism of decarboxylation reaction, all textbooks show that the electron moves from the pi<sub>C=O</sub> bond. However, the most donating bond orbital in the carbonyl group should be the lone pair(s) on the oxygen. Thus, a picture of orbital theory with delocalization from a lone pair should be more appropriate than that from the pi<sub>C=O</sub> orbital. We confirmed our idea by theoretical calculation. In the TS, if we use 2-substituted b-ketoacids, the boat-form conformation should result in exclusively preferred generation of <i>E</i>-enolates. Normally, decarboxylation reaction performs in polar solvent, so that the resulting enols should be transformed to the corresponding ketones by tautomerization. Suppose we use the heteroatoms to obtain the enolate or enol ethers without tautomerization, it would offer a diastereoselective enol(ate) synthesis with regioselectivity, since the C=C double bond should always be introduced between two carbonyl groups. After screening the heteroatoms by the theoretical calculations, we found that boron is suitable for this purpose. We confirmed our idea by theoretical calculations, offering a new boradecarboxylation reaction to produce enolates diastereoselecitively and regioselectively.

scholarly journals Highly Active Deficient Ternary Sulfide Photoanode for Photoelectrochemical Water Splitting

2020 ◽  
Author(s):  
Haimei Wang ◽  
Yuguo Xia ◽  
Haiping Li ◽  
Xiang Wang ◽  
Yuan Yu ◽  
...  
Keyword(s):  
Water Splitting ◽  
Active Sites ◽  
High Efficiency ◽  
Theoretical Calculations ◽  
Metal Sulfide ◽  
Surface States ◽  
Photocurrent Density ◽  
Highly Active ◽  
Ternary Sulfide ◽  
Ternary Metal

<div>The exploration of photoanode materials with high efficiency and stability is the </div><div>eternal pursuit for the realization of practically solar-driven photoelectrochemical </div><div>water splitting. Here we develop a novel deficient ternary metal sulfide (CdIn2S4) </div><div>as photoanode, and its PEC performance is significantly enhanced by introducing </div><div>surface S vacancies, achieving a photocurrent density of 5.73 mA cm-2 at 1.23 V vs. </div><div>RHE and 1 Sun and an applied bias photon-to-current efficiency of 2.49% at 0.477 </div><div>V vs. RHE, which, to the best of our knowledge, are the record-high values for a </div><div>single sulfide photon absorber to date. The experimental characterizations and </div><div>theoretical calculations highlight the enhanced effect of surface S vacancies on the </div><div>interfacial charge separation and transfer kinetics, and also demonstrate the </div><div>restrained surface states distribution and the transformation of active sites after </div><div>introducing surface S vacancies. This work may inspire more excellent work on </div><div>developing sulfide-based photoanodes. </div>

Study of Hybrid Method on Beam Crack Evaluation

2012 ◽  
Vol 166-169 ◽  
pp. 1113-1116
Author(s):  
Chuang Du ◽  
Sen Li ◽  
Yan Yan Li ◽  
Zi Tao Du
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Calculation ◽  
Theoretical Calculation ◽  
Hybrid Method ◽  
Crack Width ◽  
Theoretical Method ◽  
Theoretical Formula ◽  
Calculation Formula ◽  
New Formula

Based on the numerical calculation and the theoretical formula for crack width,a new semi-numerical and semi-theoretical calculation formula for crack width of beam was given. By using this new formula,finite element method and theoretical method is combined. The method has been validated with the beam, it is indicated that the proposed method can be used to calculate the crack width of beam accurately and efficiently.

Research and Analysis about Partical Compression for Individual Anchored Prestressed End Strength

2013 ◽  
Vol 395-396 ◽  
pp. 841-844
Author(s):  
Ping Pang
Keyword(s):  
Reinforced Concrete ◽  
Theoretical Calculation ◽  
Bearing Capacity ◽  
Prestressed Concrete ◽  
Calculation Formula ◽  
Concrete Member ◽  
Concrete Members ◽  
Standard Formula ◽  
Reinforced Concrete Member ◽  
Measured Load

According to the specification given, the theoretical calculation formula of the theoretical value is higher than the measured load values. Specifications given by the bureau of compressive bearing capacity formula is suitable for ordinary reinforced concrete member. For prestressed concrete members, especially scattered end anchorage of prestressed concrete member, the standard formula is not applicable.

GIS Based Large Scale Modeling and Archiving of Buildings in Historic Conservation Area: Take Luojia Hill Historic Conservation Area for Example

2012 ◽  
Vol 204-208 ◽  
pp. 3553-3556
Author(s):  
Qiang Niu
Keyword(s):  
Visual Information ◽  
Large Scale ◽  
High Efficiency ◽  
Good Effect ◽  
Conservation Area ◽  
Thematic Map ◽  
Scale Modeling ◽  
Historic Conservation ◽  
3D Scene ◽  
Large Scale Modeling

Based on the Geo-Model of GIS, the article researches the large scale modeling method for buildings in historic conservation area. Based on this model and the hotlink function of GIS, the method can efficiently manage and store the historic building attributes such as building name, age, historical value, multimedia information such as photographs and videos, and archive documents about historical events, drawings, protection issues, etc. The method support convenient and visual information utilization, including information analysis, 3D scene browse, thematic map, animation of historical evolution, etc. The application in Luojia Hill historic conservation area proves that the method has the character of high efficiency in modeling, good effect in information management, low workload, and convenience in use.

scholarly journals Theoretical Calculation and Analysis on the Composite Rock-Bolt Bearing Structure in Burst-Prone Ground

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Liang Cheng ◽  
Yidong Zhang ◽  
Ming Ji ◽  
Mantang Cui ◽  
Kai Zhang ◽  
...  
Keyword(s):  
Theoretical Calculation ◽  
Rock Burst ◽  
Mechanical Model ◽  
Surrounding Rock ◽  
Rock Bolt ◽  
Mining Engineering ◽  
Calculation Formula ◽  
Mining Depth ◽  
Rock Parameters ◽  
Bearing Structure

Given the increase in mining depth and intensity, tunnel failure as a result of rock burst has become an important issue in the field of mining engineering in China. Based on the Composite Rock-Bolt Bearing Structure, which is formed due to the interaction of the bolts driven into the surrounding rock, this paper analyzes a rock burst prevention mechanism, establishes a mechanical model in burst-prone ground, deduces the strength calculation formula of the Composite Rock-Bolt Bearing Structure in burst-prone ground, and confirms the rock burst prevention criterion of the Composite Rock-Bolt Bearing Structure. According to the rock burst prevention criterion, the amount of the influence on rock burst prevention ability from the surrounding rock parameters and bolt support parameters is discussed.

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