Results 31 to 40 of about 13,880 (221)

The clashing of in situ and pre‐cast technologies—Western trends and local traditions in concrete engineering shaping shell construction in 20th‐century Hungary

open access: yesStructural Concrete, EarlyView.
Abstract After a blossoming pre‐World War II (WWII) period, the concrete construction industry in then‐socialist Hungary existed in a relative isolation from the Western World during the mid‐20th century. In this paper, we focus on the body of work of one of the then newly established state‐owned design offices, IPARTERV, to show how the isolation ...
Orsolya Gáspár, Péter Haba
wiley   +1 more source

Dynamic weighted idle time heuristic for flowshop scheduling [PDF]

open access: yes, 2015
The constructive heuristic of Nawaz, Enscore and Ham (NEH) has been introduced in 1983 to solve flowshop scheduling. Many researchers have continued to improve the NEH by adding new steps and procedures to the existing algorithm.
Ahmad, Abd Rahman   +3 more
core   +1 more source

Taking Different Roads to Rome: Protective and Proactive Orientations Towards Institutional Power Resources

open access: yesBritish Journal of Industrial Relations, EarlyView.
ABSTRACT Works councils in Germany possess substantial institutional resources to protect workers' interests. Yet little is known about how these resources are mobilised in practice and why similar outcomes may emerge through different pathways. Drawing on two German firms acquired by Chinese state‐owned enterprises, this study examines how works ...
Tina Miedtank, Johann Fortwengel
wiley   +1 more source

Rope Tension Fault Diagnosis in Hoisting Systems Based on Vibration Signals Using EEMD, Improved Permutation Entropy, and PSO-SVM

open access: yesEntropy, 2020
Fault diagnosis of rope tension is significantly important for hoisting safety, especially in mine hoists. Conventional diagnosis methods based on force sensors face some challenges regarding sensor installation, data transmission, safety, and ...
Shaohua Xue   +3 more
doaj   +1 more source

The specifics of non‐routine task changes: A granular approach

open access: yesContemporary Economic Policy, EarlyView.
Abstract This paper estimates granular specific non‐routine tasks and examines employment reallocation across those tasks in the United States. Employment shifts into decision‐making, technology, and information‐related tasks account for 90% of high‐wage employment growth.
Carol A. Scotese
wiley   +1 more source

The Evaluation of the Effect of Power Circuit Configuration Changes on the Level of Harmonics Generated by the Hoisting Machine Drive System

open access: yesEnergies
The quality of electrical energy in mining plants is still a topic that is not directly linked to occupational safety and the efficiency of the mining process.
Tomasz Siostrzonek, Zbigniew Mikoś
doaj   +1 more source

Investigative study on temperature conditions of continuous run modes of hoisting machine electric drive [PDF]

open access: yesНаучно-технический вестник Брянского государственного университета, 2019
The paper presents the findings of the investigative study on the features of electric drives in the continuous run modes (which correspond to the run modes of belt conveyor drives) using frequency converters and operating with the natural mechanical ...
Goncharov K.A.
doaj   +1 more source

Application of a genetic algorithm in the synthesis process of structural diagrams of load-lifting mechanisms drives [PDF]

open access: yesНаучно-технический вестник Брянского государственного университета
Synthesizing the structural diagram of a hoisting mechanism drive for any lifting machine is a nontrivial and non-formalized engineering task, relying primarily on the designer’s experience in selecting the components interacting within the drive ...
Goncharov K.A.
doaj   +1 more source

Pattern recognition of rigid hoist guides based on support vector machine [PDF]

open access: yesAdvances in Mechanical Engineering, 2018
In order to evaluate the serviceable condition of rigid hoist guides and recognize their status patterns, vibration and angle signals were collected from an test-rig which can simulate different sorts of defects. Characteristic parameters by which status patterns can be judged were selected and designed.
Yansong Ma   +3 more
openaire   +2 more sources

Self-balancing beam permits safe, easy load handling under overhang [PDF]

open access: yes, 1964
The use of a self-balancing I-beam with a counterweight and motor simplifies moving heavy loads that are inaccessible for cranes. The beam cannot be overloaded, as the counterweight will not balance the load, and thus acts as an automatic safety ...
Edwards, O. H.
core   +1 more source

Home - About - Disclaimer - Privacy