A New Roller Conveyor Driven by Linear Motor

2011 ◽  
Vol 201-203 ◽  
pp. 1517-1520 ◽  
Author(s):  
Hong Sheng Zhao ◽  
Yun Zhen Wu
Keyword(s):  
Friction Force ◽  
Simple Structure ◽  
Complex Structure ◽  
Linear Motor ◽  
Advanced Technology ◽  
Roller Conveyor ◽  
Technical Problems ◽  
Linear Motors ◽  
Three Phase ◽  
New Form

To solve technical problems of current roller conveyor, such as big volume, complex structure and heavy maintenance workload, a new roller conveyor has been researched by adopting advanced technology of three-phase A.C linear motor. It has no intermediate transmission units that exist in the conventional roller conveyor, and is a new form structure of the conveyor. The device consists mainly of rollers and linear motors. The roller serves as driving and load-bearing mechanism, and as the rotor of linear motor, too. In the process of operation, with rollers served as the carriers, the friction force between rollers and objects transmits the motion consummately to achieve the goal of transportation. This new conveyor can completely replace the current various types of roller conveyor with such features as simple structure, low failure rate and cost.

scholarly journals Evaluation of e-health (Seha) application: a cross-sectional study in Saudi Arabia

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Abeer Alharbi ◽  
Joharah Alzuwaed ◽  
Hind Qasem
Keyword(s):  
Saudi Arabia ◽  
Health Services ◽  
Healthcare Services ◽  
Cross Sectional Study ◽  
Advanced Technology ◽  
Sectional Study ◽  
Cross Sectional ◽  
Technical Problems ◽  
Significant Difference ◽  
Ease Of Access

Abstract Background The Ministry of Health in Saudi Arabia is expanding the country’s telemedicine services by using advanced technology in health services. In doing so, an e-health application (app), Seha, was introduced in 2018 that allows individuals to have face-to-face visual medical consultations with their doctors on their smartphones. Objective This study evaluated the effectiveness of the app in improving healthcare delivery by ensuring patient satisfaction with the care given, increasing access to care, and improving efficiency in the healthcare system. Methods A cross-sectional study design was used to assess the perceptions of users of the Seha app and non-users who continued with traditional health services. The data were collected using an online survey via Google Forms between June 2020 and September 2020. Independent t tests and chi-square (χ2) tests were conducted to answer the research questions. Results There was a significant difference between users and non-users in terms of ease of access to health services (t =  − 9.38, p < 0.05), with app users having a higher mean score (4.19 ± 0.91) than non-users (3.41 ± 1.00); satisfaction with health services (t =  − 6.33, p < 0.05), with users having a higher mean score (3.96 ± 0.91) than non-users (3.45 ± 0.94); and efficiency (only one visit needed for treatment) (t =  − 3.20, p < 0.05), with users having a higher mean score (3.71 ± 0.93) than non-users (3.45 ± 0.93). There were significant associations between the use of the Seha app and age (χ2 = 8.79, p < 0.05), gender (χ2 = 22.19, p < 0.05), region (χ2 = 19.74, p < 0.05), and occupation (χ2 = 22.05, p < 0.05). There were significant relationships between the three items (on access, satisfaction, and efficiency) and experiencing technical issues (t = 4.47, t = 8.11, and t = 3.24, respectively, p < 0.05), with users who faced technical problems having significantly lower mean scores for all three items. Conclusion This study provided evidence that the Seha app improved the delivery of healthcare in Saudi Arabia. Users of the app had a better health experience in terms of their perceived ease of access to healthcare services; their satisfaction with healthcare services; and the efficiency of the system, measured by the number of required doctor visits. Other factors that appeared to influence the use of the app included age, gender, usual source of care, and technical difficulties.

scholarly journals Methyl phenlactonoates are efficient strigolactone analogs with simple structure

2017 ◽  
Vol 69 (9) ◽  
pp. 2319-2331 ◽  
Author(s):  
Muhammad Jamil ◽  
Boubacar A Kountche ◽  
Imran Haider ◽  
Xiujie Guo ◽  
Valentine O Ntui ◽  
...  
Keyword(s):  
Mycorrhizal Fungi ◽  
Simple Structure ◽  
Complex Structure ◽  
Arbuscular Mycorrhizal ◽  
Structural Diversity ◽  
Striga Hermonthica ◽  
Biological Processes ◽  
Structural Modifications ◽  
New Class ◽  
Agricultural Applications

abstract Strigolactones (SLs) are a new class of phytohormones that also act as germination stimulants for root parasitic plants, such as Striga spp., and as branching factors for symbiotic arbuscular mycorrhizal fungi. Sources for natural SLs are very limited. Hence, efficient and simple SL analogs are needed for elucidating SL-related biological processes as well as for agricultural applications. Based on the structure of the non-canonical SL methyl carlactonoate, we developed a new, easy to synthesize series of analogs, termed methyl phenlactonoates (MPs), evaluated their efficacy in exerting different SL functions, and determined their affinity for SL receptors from rice and Striga hermonthica. Most of the MPs showed considerable activity in regulating plant architecture, triggering leaf senescence, and inducing parasitic seed germination. Moreover, some MPs outperformed GR24, a widely used SL analog with a complex structure, in exerting particular SL functions, such as modulating Arabidopsis roots architecture and inhibiting rice tillering. Thus, MPs will help in elucidating the functions of SLs and are promising candidates for agricultural applications. Moreover, MPs demonstrate that slight structural modifications clearly impact the efficiency in exerting particular SL functions, indicating that structural diversity of natural SLs may mirror a functional specificity.

Nonlinear Analysis of Cable Net Structures Suspended from Arches with Block and Tackle Suspension System, Taking into Account the Friction of the Pulleys

2009 ◽  
Vol 24 (3) ◽  
pp. 143-152 ◽  
Author(s):  
Krisztián Hincz
Keyword(s):  
Structural Analysis ◽  
Static Analysis ◽  
Simple Structure ◽  
Complex Structure ◽  
Numerical Procedure ◽  
Suspension System ◽  
Dynamic Relaxation ◽  
Final State ◽  
The Stability ◽  
External Loads

A numerical procedure for the static analysis of arch-supported tensile structures with block and tackle suspension system is presented. The procedure, based on dynamic relaxation, is suitable for a structural analysis both in the prestressing process and in a final state under external loads. The friction between the pulley and its shaft is also taken into account in the analysis. After the introduction of the developed procedure, two structures are presented as examples. The analysis of a very simple structure validates the procedure, then the analysis of a more complex structure, an arch-supported cable net roof illustrates the stability and efficiency of the procedure.

Temperature Field Analysis and Cooling Structure Design of Ironless Permanent Magnet Synchronous Linear Motor

2021 ◽  
Vol 14 ◽  
Author(s):  
Xiaoting Lu ◽  
Yang Li ◽  
Zailiang Chen
Keyword(s):  
Temperature Field ◽  
Permanent Magnet ◽  
Heat Loss ◽  
Linear Motor ◽  
Structure Design ◽  
Servo Control ◽  
Field Analysis ◽  
Temperature Fields ◽  
Water Cooling ◽  
Linear Motors

Objective: Ironless, permanent magnet, synchronous linear (IPMSL) motors are applied widely in precision servo control for the nonexistence of cogging forces and comparatively small fluctuations in thrust and speed. Method: The air and water cooling structures are designed by assuming the heat loss in the motor operations is the source for the distribution of the temperature field in the analysis under natural cooling. Conclusion: The temperature fields of the linear motor under the two cooling modes are compared and analyzed, which helps monitor the temperature of linear motors during development and operations.

Research on a Model of Reverberation

2013 ◽  
Vol 321-324 ◽  
pp. 1117-1122
Author(s):  
Li Cai Zhang ◽  
Xiao Juan Tong
Keyword(s):  
High Frequency ◽  
Simple Structure ◽  
Complex Structure ◽  
Chebyshev Approximation ◽  
Comb Filter ◽  
Frequency Signal ◽  
High Frequency Signal ◽  
Low Pass ◽  
Absorption Characteristics ◽  
Approximation Criterion

Against defects of lacking consideration of air absorption characteristics to the high frequency signal in Schroeder reverberation model, and the more complex structure in Moorer reverberation model, use equiripple Chebyshev approximation criterion to design 4 FIR comb filter with low-pass characteristics and make the FIR filters in parallel, to get a pure parallel reverberation model. This reverberation model considers the absorption characteristics of air to the high-frequency signal, and has a more simple structure.

scholarly journals A family of formulas with reversal of high avoidability index

2017 ◽  
Vol 27 (05) ◽  
pp. 477-493 ◽  
Author(s):  
James Currie ◽  
Lucas Mol ◽  
Narad Rampersad
Keyword(s):  
Simple Structure ◽  
Complex Structure ◽  
Infinite Family ◽  
Index Formula ◽  
The Family

We present an infinite family of formulas with reversal whose avoidability index is bounded between [Formula: see text] and [Formula: see text], and we show that several members of the family have avoidability index [Formula: see text]. This family is particularly interesting due to its size and the simple structure of its members. For each [Formula: see text] there are several previously known avoidable formulas (without reversal) of avoidability index [Formula: see text] but they are small in number and they all have rather complex structure.

Research and Development of a Test Platform for Synthetic Performance Parameters of Linear Motors

2011 ◽  
Vol 383-390 ◽  
pp. 4486-4491
Author(s):  
Zhong Quan Luan ◽  
Hu Yan Ji ◽  
Qing Dong Yang
Keyword(s):  
Research And Development ◽  
High Precision ◽  
Virtual Instrument ◽  
High Speed ◽  
Linear Motor ◽  
Cnc Machine Tools ◽  
Performance Parameters ◽  
Cnc Machine ◽  
Linear Motors ◽  
Test Platform

Linear Motors have been used more and more widely in high precision and high-speed linear motion for CNC machine tools, but uniform testing standards and methods for linear motor performance have not been established in China. Based on the virtual instrument software platform by means of computer technology, research and development of the test platform for synthetic performance parameters of linear motors can realize the rapid and accurate measurement, automatic storage and processing of linear-motor output, currents, positions, temperatures and other performance parameters. , Meanwhile, the platform can also provide the technical direction for design or improvement of linear motors, and technically support the formulation of related standards. Experiments showed that the test platform for synthetic performance parameters of linear motors can achieve high precision and automatic measurement to meet the testing requirements for synthetic performance of linear motors.

scholarly journals STRUCTURAL COMPLEXITY OF ARTIFICIAL HABITAT AND THE FEEDING SUCCESS OF PREDATORY DRAGONFLY AND DAMSELFLY

2013 ◽  
Vol 13 (2) ◽  
Author(s):  
Khairuddin, Lalu Japa Dan Nur Lestari
Keyword(s):  
Habitat Complexity ◽  
Habitat Structure ◽  
Simple Structure ◽  
Complex Structure ◽  
Structural Complexity ◽  
Artificial Habitat ◽  
Artificial Habitats ◽  
Feeding Success ◽  
Structure Complexity

AbstractThe effect of different habitat complexity structure on the feeding success of predatoryDragonfly and Damselfly over the four of three hours trials was tested using an artificialhabitat complexity structure. Complexity of artificial habitat structure was performed usingwoody bamboo stick of 5 cm in length and 2 mm in diameter. The artificial habitats were setin plastic tank with length and wide of 17 cm and 11.5 cm, respectively and 5.5 cm high. Thedeep of water colom was about 4.5 cm. Preys were larvae of mosquitoes. There was highlysignificant of feeding success of predators in simple structure of habitats and significantenough in complex structure of habitats. In other words, feeding success of predatoryDragonfly and Damselfly was much higher in the simple habitats structure compared to thatof the complex one.Key Words : Artificial Habitat, Damselfly, Dragonfly, Feeding, and PredatoryAbstrakPengaruh kompleksitas struktur habitat terhadap keberhasilan pemangsaan predator Dragonflydan Damselfly selama empat kali tiga jam perlakuan diteliti di laboratorium menggunakanhabitat buatan. Kompleksitas struktur habitat dibuat dengan tongkat dari bambu berukuranpanjang 5 cm dengan diameter 2 mm. Habitat buatan dibuat di bak plastik berukuran panjangdan lebar masing-masing 17 cm dan 11,5 cm, dan tinggi 5,5 cm dengan kedalaman kolom airsekitar 4,5 cm. Larva nyamuk digunakan sebagai pangsa dalam penelitian ini. Setiapperlakuan terdiri dari dua ulangan. Setiap perlakuan berlangsung empat kali masing-masingselama tiga jam. Hasil memperlihatkan, keberhasilan pemangsaan Dragonfly dan Damselflysangat signifikan pada habitat stuktur sederhana, dan cukup signifikan pada habitat yangkompleks. Dengan kata lain, keberhasilan pemangsaan Dragonfly dan Damselfly jauh lebihtinggi pada habitat berstruktur sederhana dibanding dengan pada habitat berstrukturkompleks.Kata Kunci : Damselfly, Draggonfly, Habitat Buatan, Pemangsaan, Pemangsa (Predator)

Research on Rope-Less Hoist System Driven by PMLSM

2011 ◽  
Vol 216 ◽  
pp. 539-543 ◽  
Author(s):  
Xu Dong Wang ◽  
Hai Chao Feng ◽  
Bao Yu Xu ◽  
Xiao Zhuo Xu
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Small Volume ◽  
Simple Structure ◽  
Experimental Results ◽  
Experimental Device ◽  
Stable Operation ◽  
Operation Performance ◽  
Technical Problems ◽  
Design Scheme

Rope-less hoist system driven by permanent magnet linear synchronous motor has the advantages of simple structure, small volume, high force, unlimited hoisting height and speed. So, it is attracting more attention, increasingly becoming a research hot and difficult in the vertical hoist field. In this paper, a design scheme of direct driving high-speed elevator is proposed according to the key technical problems of rope-less hoist system driven by PMLSM, and then a small-sized home elevator prototype is built. Experimental results show the safe and stable operation performance of the experimental device, which offers the reference for the further research and the development and application of PMLSM rope-less hoist system.

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