Results 31 to 40 of about 3,846 (166)

The Earliest Lead Object in the Levant. [PDF]

PLoS ONE, 2015
In the deepest section of a large complex cave in the northern Negev desert, Israel, a bi-conical lead object was found logged onto a wooden shaft.
Naama Yahalom-Mack, Dafna Langgut, Omri Dvir, Ofir Tirosh, Adi Eliyahu-Behar, Yigal Erel, Boaz Langford, Amos Frumkin, Mika Ullman, Uri Davidovich   +9 more
doaj   +1 more source

Histological analysis of the spatio‐temporal development of porcine knee cartilage in embryonic and early postnatal stages

Animal Models and Experimental Medicine, EarlyView.
This study dynamically charts the developmental process of the knee joint cartilage from the embryonic stage through to postnatal life, revealing key developmental events including the origin of knee joint development, chondrification, primary ossification, secondary ossification, formation of the cartilage cancal, and formation of the growth plate. It
Yan Nie, Kai Wang, Xuewen Wang, Jinzhu Jing, Zhen Liang, Guoqiang Yan, Wen Feng Guo, Meng Zhang, Wei Zhang, Lei Xiang   +9 more
wiley   +1 more source

Static analysis of multi-support stepped spindle shafts with nonlinear elastic bearings

Bulletin of the National Technical University «KhPI» Series: Dynamics and Strength of Machines, 2022
In this paper a mathematical model and a computational technique for the static analysis of multi-support stepped spindle shafts on nonlinear elastic supports are presented. On the basis of the Timoshenko differential equation of the beam's bent axis and the method of initial parameters, a resolving system of equations is obtained that takes into ...
Valerij Havin, Oleksiy Kyrkach, Borys Kyrkach   +2 more
openaire   +1 more source

Revisiting paravertebral muscles in European rabbits (Oryctolagus cuniculus) and European brown hares (Lepus europaeus) (Leporidae; Lagomorpha)

The Anatomical Record, EarlyView.
Abstract Domesticated European rabbits (Oryctolagus cuniculus) have long been chosen as laboratory model organisms. Despite this, there has been no definitive study of the vertebral musculature of wild rabbits. Relevant descriptions of well‐studied veterinary model mammals (such as dogs) are generally applicable, but not appropriate for a species ...
Nuttakorn Taewcharoen, Emma Sherratt, Philip Stott, Rachel Norris   +3 more
wiley   +1 more source

Osteohistological evidence for terrestrial adaptation and an extended growth period in mekosuchine crocodylians and its potential role in their extinction

The Anatomical Record, EarlyView.
Abstract The Australasian crocodylian fossil record is dominated by the extinct endemic clade Mekosuchinae, with known members spanning the Eocene‐to‐Holocene. This diverse clade exhibited high morphological disparity, from early members superficially similar to Crocodylus, to more terrestrial forms later in the clade's evolutionary history.
Devin K. Hoffman, Cecily S. C. Nicholl, Oliver Bradley, Sreya Magar, Marie Sofia Sebaratnam, Alexandra Houssaye, Ryan N. Felice, Adam M. Yates, Stephen F. Poropat, Philip D. Mannion   +9 more
wiley   +1 more source

Experimental study on the lubrication characteristics of porous journal bearings with hydrodynamic shape forming at annular surface under sine-wave vibrated conditions (Examination into the shaft rotating behavior at the starting state by identifying the rotational modes with Frequency Spectrum Analysis of the time history waveform on shaft)

Nihon Kikai Gakkai ronbunshu, 2019
This report describes the study on the lubrication characteristics of porous journal bearings, which were made with oil impregnated sintered materials having some hydrodynamic shapes, to apply them for a DC Spindle Motor’s bearing system. Herring Bone (I
Shigeru OHTSUKA, Masaki YAKABE, Yasutaka HAYAMIZU, Koichi OTSUKA   +3 more
doaj   +1 more source

Analysis of Mechanical‐Electrical‐Hydraulic Coupled Vibration Response Characteristics of Thermal Control Circulating Pumps Supported by Water‐Lubricated Bearings

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT The operational reliability of thermal control circulation pumps is significantly restricted by the multi‐physics coupled environment. To reveal the vibration transmission mechanisms and dynamic response characteristics under multi‐field coupled excitations, a multi‐DOF coupled dynamic representation of the overall system, incorporating the ...
Jianfeng Luo, Liukai Hou, Yutao Zou, Kaiyuan Hao, Guangwu Zhou   +4 more
wiley   +1 more source

Finite‐Difference Reduced Transfer Matrix Method for Multibody Systems With Rotating Beams

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT Multibody systems with rotating beams serve as critical simplified models of core components in engineering systems; however, existing analytical and numerical methods have limitations in analyzing their complex dynamic behavior. This paper proposes the Finite‐Difference Reduced Multibody System Transfer Matrix Method (FD‐RMSTMM), which ...
Ziyao Ma, Hanjing Lu, Caishan Liu, Xiaoting Rui   +3 more
wiley   +1 more source

PREDICTION OF ROTARY ACCURACY OF FRAME-TYPE COMBINED SPINDLE BASED ON FORM AND POSITION ERRORS

Jixie qiangdu, 2021
Frame-type combined spindles are widely used in precision products such as CNC rotary tables and aerospace flight simulators. Due to the multiple geometric errors in their component parts,the rotary precision of the frame-type combined spindle is ...
NI WeiHua, JIANG XiaoHui
doaj  

Experimental study on the lubrication characteristics of porous journal bearings with hydrodynamic shape forming at annular surface under sine-wave vibrated conditions (Examination into the shaft whirling behavior at pivot supported condition by measuring the time history waveform on shaft with parameter of vibrated Frequency changes)

Nihon Kikai Gakkai ronbunshu, 2018
This report describes the study on the lubrication characteristics of porous journal bearings as a DC spindle motor's bearing system made with oil impregnated sintered materials having some hydrodynamic shapes. Herring Bone (I & II), Three Lobed
Shigeru OHTSUKA, Masaki YAKABE, Yasutaka HAYAMIZU, Koichi OTSUKA   +3 more
doaj   +1 more source