Results 81 to 90 of about 4,984 (269)

AGRICULTURE IN A SOCIALIST CITY: Towards an Alter‐Urban Political Ecology

International Journal of Urban and Regional Research, EarlyView.
Abstract Urban political ecology has developed as a critique of capitalist urbanization. This article develops the concept of alter‐urban political ecology to define urban environments emerging not from capitalist urbanization but from efforts to transform it. Drawing on archival research and ethnographic fieldwork in five urban farms in socialist Cuba,
Gustav Cederlöf
wiley   +1 more source

Life analysis of helical gear sets using Lundberg-Palmgren theory [PDF]

A mathematical model is developed for surface fatigue life of helical gears. The expected fatigue life of a pinion, gear, or gear set may be calculated from the model. An equation for the dynamic capacity of a gear set was also derived.
Coy, J. J., Zaretsky, E. V.
core   +1 more source

Sustainability Controls as Technologies of Actorhood: Constructing the Responsible Supplier in Global Supply Chains Le contrôle de la durabilité comme technologie d'actorialité : façonner le fournisseur responsable dans les chaînes d'approvisionnement mondiales

Contemporary Accounting Research, EarlyView.
ABSTRACT This paper examines how accounting and control practices constitute and distribute agency and responsibility for sustainability in global supply chains. Drawing on a field study in the fashion industry, we describe the sustainability control practices used by a major buyer firm vis‐à‐vis its suppliers and trace their evolution from a ...
Martin Messner, Marek Reuter, Torkel Strömsten   +2 more
wiley   +1 more source

渐开线齿轮动力接触有限元分析及修形影响

Jixie chuandong, 2008
The dynamic contact finite element models of standard involute gear and modification gear are established in the software of ANSYS. Based on the explicit dynamic formula of ANSYS/LS-DYNA, the dynamic contact analysis of gears under different rotation ...
孙建国, 林腾蛟, 李润方, 刘文
doaj  

Study on Point Contact Parabolic Tooth Surface Construction and Sliding Coefficient Calculation Method based on Selectable Contact Trail

Jixie chuandong, 2021
A new type of point contact gear pair is proposed. Based on a tooth surface，the flexible contact trail is selected according to the design requirements，and the meshing pair gear is constructed，and the sliding coefficient calculation method of the new ...
Shuai Peng, Jing Zhang, Linxiang Wang
doaj  

Design of Gearings from Involute-Bevel Gears

Vestnik IzhGTU imeni M.T. Kalashnikova
The article presents formulas for determining the dimensions of involute-bevel gears and the gearings composed of them. It examines the most general cases of gearings formation, consisting of two involute-bevel gears with crossing axes (hyperboloid gearings), with intersecting axes (bevel gearings), and with parallel axes (cylindrical gearings ...
B.A. Lopatin, S.V. Plotnikova, D.B. Lopatin   +2 more
openaire   +1 more source

On 3‐MMC: A Cathinone I Have Come to Know and Love

Anthropology of Consciousness, EarlyView.
ABSTRACT This article attempts to complicate the mythology of a compound in a state of becoming. I will trace lightly its origins as a cultural disruptor and how I am implicated in this imperative. Introducing you to 3‐MMC will require multiple modes of storytelling and taking of liberties, drawing on literature reviews, practice‐based research, prose,
Carmen Ostrander
wiley   +1 more source

Predicted effect of dynamic load on pitting fatigue life for low-contact-ratio spur gears [PDF]

How dynamic load affects the surface pitting fatigue life of external spur gears was predicted by using the NASA computer program TELSGE. Parametric studies were performed over a range of various gear parameters modeling low-contact-ratio involute spur ...
Lewicki, David G.
core   +1 more source

Drivers of bat researchers’ intent to adopt field hygiene practices

Conservation Biology, EarlyView.
Abstract Infectious disease is a growing threat to wildlife, with zoonotic transmission most likely at the human–wildlife interface. One underappreciated activity at this interface is fieldwork with wild animals, but associated risks can be mitigated through field hygiene (FH) practices, such as using personal protective equipment and other appropriate
Joanna L. Coleman, Ewan A. Macdonald, Abigail L. Rutrough, Tanja M. Straka, Todd D. Little, Zachary Stickley, Tigga Kingston   +6 more
wiley   +1 more source

基于Matlab的齿轮磨齿渐开线起始点直径的求解

Jixie chuandong, 2012
In allusion to the diameter problem of involute starting point during gear grinding,the mathematical model of the hob rolling gear is established based on principles of gear engagement.The gear tooth profile is deduced from the hob tooth parameters using
陈琰, 许仁伟, 姜维杰, 严松伟
doaj