Construction Planning for a Modularized Rail Structure: Type Selection of Rail Structure Modules and Dispatch Planning of Constructor Robots

2018 ◽  
pp. 605-617 ◽  
Author(s):  
Rui Fukui ◽  
Yuta Kato ◽  
Gen Kanayama ◽  
Ryo Takahashi ◽  
Masayuki Nakao
Keyword(s):  
Structure Type ◽  
Construction Planning ◽  
Type Selection ◽  
Rail Structure ◽  
Selection Of

An Analysis on Structure Type Selection and Optimization of the Formtraveller for Cantilever Construction

2013 ◽  
Vol 454 ◽  
pp. 140-144
Author(s):  
Xiao Yu Liu ◽  
Liang Li
Keyword(s):  
Comparative Analysis ◽  
Structure Type ◽  
Advantages And Disadvantages ◽  
Working Space ◽  
Type Selection ◽  
Structural Rigidity ◽  
Steel Consumption ◽  
Main Factors ◽  
Cantilever Construction ◽  
Selection Of

Aiming at the advantages and disadvantages of triangle and rhombic main truss-types and their respective scopes of application, a comparative analysis for the two commonly used truss-type formtravellers has been done. The main factors for analysis are load bearing capability, structural rigidity, steel consumption and working space. It provides a useful reference for the design and selection of the formtraveller. In addition, for the overall deformation of the formtraveller, it is structural optimized while height of column of the truss and suspenders are changed. Finally, the analysis results show the reasonable height of the column and suspender arrangement to achieve the construction target of safety and cost-effectiveness.

Basking Site Selection and Usage Strategies of the European Pond Turtle, Emys orbicularis (Linnaeus, 1758) in Babat valley (Gödöllő, Hungary)

2021 ◽  
Vol 28 (4) ◽  
pp. 175-184
Author(s):  
Gergő Erdélyi ◽  
Borbála Szabó ◽  
István Kiss
Keyword(s):  
Site Selection ◽  
Habitat Characteristics ◽  
Freshwater Turtles ◽  
Emys Orbicularis ◽  
Pond Turtle ◽  
Site Type ◽  
Type Selection ◽  
Body Sizes ◽  
Negative Effect ◽  
Selection Of

Sun basking is the most common method for freshwater turtles, such as the European pond turtle, to maintain optimal body temperature. The attributes of the macro- and microhabitat features around the basking sites affect the basking site selection of the European pond turtle. To protect the European pond turtle, it is important to know the basking habits among the biological characteristics of the species, along with the effects of the habitat characteristics and the choice of the type of basking sites. The purpose of our research was to detect the effects of macro- and microhabitat features on the selection of basking sites. We wanted to determine basking site type selection according to the carapace length classes and if there is any difference in the choice of basking trunks and branches with different thicknesses. Turtles choose basking sites with less closed vegetation in their environment. We have detected seasonal differences in the microhabitat features. The closing reed and Typha sp. had a negative effect on the number of observed basking turtles. The most popular type of basking sites in the pond system was the commonly occurred fallen tree trunks and branches in the water, regardless of turtle body size. Most turtles used thinner tree trunks and branches for basking. In the meantime, we found differences in the choice of basking trunks between the turtles with different body sizes. Younger turtles with smaller bodies appeared in larger numbers on emergent branches with smaller diameters.

Comparative analysis of straight grate machines and combined facilities grate-tubetype kiln-cooler for selection technologies of pellets production

2021 ◽  
Vol 77 (8) ◽  
pp. 957-968
Author(s):  
A. A. Butkarev ◽  
E. A. Butkareva
Keyword(s):  
Comparative Analysis ◽  
Iron Ore ◽  
High Efficiency ◽  
Electric Energy ◽  
Iron Ore Pellets ◽  
Electric Energy Consumption ◽  
Ore Pellets ◽  
Type Selection ◽  
Cost Of Energy ◽  
Selection Of

At present, mainly straight grate machines (SGM) and combined facilities grate-tube-type kiln-cooler (GKC) are used for heat-strengthening induration of iron ore pellets. Their total share in the produced iron ore pellets in the world accounts for 93%, of which SGM takes 60% and GKC – 33%, which speaks about high efficiency of both methods of induration. At the same time, when making decision on construction a pelletizing plant, a question of selection of most effective technology of iron ore pellets production by SGM and GKC often arises. Results of comparative analysis of efficiency of technologies of iron ore pellets production by SGM and GKC presented. Features of various ore types pellets induration considered as well as possibilities of ensuring the required quality of finished pellets at application for induration SGM and GKC. Data on maximum productivity of the considered induration facilities, amount of dust, fines formation, emissions of harmful substances into environment and electric energy consumption presented. Importance of a possibility of accounting of fuel type selection, of heat expenses for heat treatment, of expenses for maintenance, capital and operation costs were noted. It was shown that choice of a particular variant of technology should be done at the stage of elaboration feasibility study accounting existing experience of facilities running, availability of fuel types, cost of energy resources, climate zone and assembling solutions.

scholarly journals Research and Application of Rubber Tree Quantitative Fertilization System Control Based on PLC

2018 ◽  
Vol 176 ◽  
pp. 01013
Author(s):  
Yeqin Wang ◽  
Yuan Zhang ◽  
Yiguo Deng ◽  
Lijiao Wei ◽  
Shengli Liu
Keyword(s):  
Natural Rubber ◽  
Control Method ◽  
Frequency Converter ◽  
Rubber Tree ◽  
Control Process ◽  
System Control ◽  
Application Process ◽  
Type Selection ◽  
Fertilization System ◽  
Selection Of

In this paper, the quantitative control method and system control process of the natural rubber forest quantitative fertilization system are introduced on the basis of the demand for the quantitative fertilization of natural rubber forest and the application process of the rubber forest fertilizing machine. The selection of PLC, frequency converter type selection and software design process are described in detail.

The causes, impacts and mitigations of delay in megaprojects in the Sultanate of Oman

2017 ◽  
Vol 22 (3) ◽  
pp. 286-302 ◽  
Author(s):  
Adekunle Sabitu Oyegoke ◽  
Naseer Al Kiyumi
Keyword(s):  
Rank Order ◽  
Site Management ◽  
Sultanate Of Oman ◽  
Construction Planning ◽  
Content Type ◽  
Financial Condition ◽  
Importance Index ◽  
Efficient Construction ◽  
Mitigation Methods ◽  
Selection Of

Purpose Project delay is becoming a problem in the Sultanate of Oman as evidenced by many delayed projects across the country. The purpose of this study is to examine causes and effects of delays in megaprojects in the Sultanate of Oman with recommendations to mitigate same. Design/methodology/approach A systematic review of literature identifies through main stakeholders the numerous causes, impacts and methods of mitigating delay from previous studies. A questionnaire survey on Oman was carried out to sample opinions from the practitioners; 53 questionnaires were received and analysed using the relative importance index (RII) method. Findings The five most frequent causes of delay in the Sultanate of Oman, in rank order, are: selection of the lowest bid, instead of best bid for the client (RII: 0.698); the financial condition of the main contractor (RII: 0.664); delay in decision-making by the client (RII: 0.656); and poor construction planning by the main contractor (RII: 0.649). Also, the findings indicate that extra cost (RII: 0.754) and project time overrun (RII: 0.724) are the most significant effects of the delay in the Oman megaprojects. The use of experienced contractors and consultant (RII 0.675), efficient construction planning by the main contractor and effective site management and supervision (RII: 0.667) are essential mitigation methods of construction delay in Oman megaprojects. Originality/value The study recommends three-part novel solutions to mitigate delay in the Oman construction industry.

MATLAB-Based Kinematic Analysis on Mechanisms of Multifunctional Wheelchair

2010 ◽  
Vol 97-101 ◽  
pp. 2785-2791
Author(s):  
Ai Ping Li ◽  
Jun Hu ◽  
Jian Guo Zhang
Keyword(s):  
Simulation Model ◽  
Dynamic Simulation ◽  
Upper Limb ◽  
Kinematic Analysis ◽  
Working Condition ◽  
Simulation Tool ◽  
Type Selection ◽  
Motion Parameters ◽  
Selection Of

This paper simplifies the upper limb lifting mechanism of the multifunctional wheelchair, takes the dynamic simulation tool Simulink of MATLAB as a platform, establishes a simulation model for kinematic analysis on the upper limb lifting mechanism, and executes the simulation after all parameters are set. The result shows that such simulation can help to conveniently and accurately get the motion parameters of the mechanism and optimize the parameters immediately, so that reference can be provided for type selection of this mechanism, it can be better understand the working condition of the multifunctional wheelchair, and complete the structure of product prototypes.

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