scholarly journals Uniform Pattern Mapping for Freeform Surface

2021 ◽  
Vol 87 (2) ◽  
pp. 226-230
Author(s):  
Keigo TAKASUGI ◽  
Naoki ASAKAWA ◽  
Takahiko MIZUTANI
Keyword(s):  
Freeform Surface ◽  
Uniform Pattern

Soft Twisting Pneumatic Actuators Enabled by Freeform Surface Design

2021 ◽  
pp. 1-1
Author(s):  
Feifei Chen ◽  
Yunpeng Miao ◽  
Guoying Gu ◽  
Xiangyang Zhu
Keyword(s):  
Freeform Surface ◽  
Surface Design ◽  
Pneumatic Actuators

scholarly journals Asymmetric Double Freeform Surface Lens for Integrated LED Automobile Headlamp

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 663
Author(s):  
Hui Zhang ◽  
Dengfei Liu ◽  
Yinwan Wei ◽  
Hong Wang
Keyword(s):  
Optical System ◽  
Design Method ◽  
Chromatic Dispersion ◽  
Electronic Devices ◽  
Color Temperature ◽  
Freeform Surface ◽  
United Nations Economic Commission ◽  
System A ◽  
Economic Commission ◽  
Key Points

We propose a design method of asymmetric double freeform surface lens for an integrated LED automobile headlamp and develop an integrated LED automobile optical system. A single asymmetric double freeform surface lens is designed to redistribute rays emitting from the light source for realizing both low and high beams. Moreover, a freeform surface reflector is used to improve the energy efficiency of high beams. The prism placed in the optical path can suppress chromatic dispersion on the edge of the target plane. Simulation and experimental results show that the illumination values and color temperature of the key points can fully meet the requirements of United Nations Economic Commission for Europe vehicle regulations (ECE) R112, 48, and 128. The volume of the whole optical system comprised of freeform surface elements is smaller than that of the low beam system of a traditional headlamp, resulting in saved space, in which other electronic devices can be installed for the safety of the driver, which indicates that the proposed method is practical in the field of automobile lighting.

Two-step carrier-wave stitching method for aspheric and freeform surface measurement with a standard spherical interferometer

2018 ◽  
Vol 57 (17) ◽  
pp. 4743 ◽  
Author(s):  
Qun Hao ◽  
Shaopu Wang ◽  
Yao Hu ◽  
Yifeng Tan ◽  
Tengfei Li ◽  
...  
Keyword(s):  
Freeform Surface ◽  
Surface Measurement ◽  
Carrier Wave

Final stage larvae and puparia of Platypezidae (Diptera)

2004 ◽  
Vol 35 (1) ◽  
pp. 79-105 ◽  
Author(s):  
Peter Chandler ◽  
Francis Gilbert ◽  
Graham Rotheray
Keyword(s):  
Phylogenetic Analysis ◽  
Final Stage ◽  
Abdominal Segment ◽  
Early Stage ◽  
Dorsal Surface ◽  
Uniform Pattern ◽  
Thoracic And Abdominal ◽  
Head Skeleton ◽  
Basal Position

AbstractPlatypezidae occupy an important basal position within the Muscomorpha. However, morphological analyses of larval Platypezidae are incomplete and early stage data is insufficient to inform phylogenetic analysis and recognition of groundplan characters and states within Muscomorpha. For example, knowledge is poor of the characters of respiratory organs, head, head skeleton, thorax and segmental sensilla. In this study we describe and compare these features of 16 species in 11 genera. The head appears as a distinct fleshy organ with atrium and antennae and maxillary organs separated on the dorsal surface. Head skeletons are characterised by an anteriorly projecting labrum and labium with laterally placed mandibles. The prothorax is frequently armoured with sclerotised regions and spicules. A repeated and uniform pattern of up to 11 pairs of sensilla circumvent each thoracic and abdominal segment. Respiratory organs vary little in size and arrangement of spiracular openings. Using a set of 43 larval and puparial characters and based on a Brachyceran outgroup, a sequence of genera is established which places Melanderomyia as the most basal. These results are compared with estimates of phylogeny based on adult characters.

Towards Better Ways of Reading the Bible

1980 ◽  
Vol 33 (4) ◽  
pp. 301-315 ◽  
Author(s):  
Bryan J. Gray
Keyword(s):  
Common Core ◽  
Uniform Pattern ◽  
The Bible ◽  
Biblical Scholarship

The growing rift between biblical scholarship and the dogmatic and moral theologies of the Churches is a challenge to us all. But not only is it necessary to examine the presuppositions of the biblical scholars; it is also necessary to investigate the questions raised by their critics. Is there a uniform pattern in the questions raised? Do the critics provide any suggestions as to how the Scripture scholar should operate? Is there a common core which can be detected in the midst of the disquiet?

Social change in the Later Neolithic of Central Europe

Antiquity ◽  
1985 ◽  
Vol 59 (225) ◽  
pp. 30-38 ◽  
Author(s):  
N. J. Starling
Keyword(s):  
Social Change ◽  
Material Culture ◽  
Central Europe ◽  
Major Change ◽  
Northern Europe ◽  
Uniform Pattern ◽  
Funnel Beaker Culture ◽  
Small Sites ◽  
Important Shift ◽  
Complete Collapse

Profound changes occurred in central and northern Europe towards the end of the 3rd millennium bcX, when a uniform pattern of settlement, burial and material culture-the Corded Ware complexreplaced the diversity of the middle neolithic groups of the TRB (or Funnel Beaker Culture). Collective graves and large settlement sites gave way to individual burials in a largely dispersed pattern of settlement based on small sites. This was accompanied by a spread of sites into hitherto uncolonized areas, and a greater variety of locations used for settlement. This major change might at first seem to indicate a complete collapse of the earlier system, with an undifferentiated pattern replacing the apparent beginnings of hierarchies indicated by the Middle Neolithic. Kristiansen ( I 982) has recently suggested for Denmark that the middle neolithic system disintegrated, fitting a model of cyclical tribal development. It is suggested here, however, that the transformation of the middle neolithic pattern is better seen as a changed structure, which does not involve concepts such as disintegration or collapse, but marks an important shift in the organization of neolithic societies.

Integrating Freeform and Feature-Based Fitting Methods

2004 ◽  
Author(s):  
H. James de St. Germain ◽  
David E. Johnson ◽  
Elaine Cohen
Keyword(s):  
Reverse Engineering ◽  
Surface Fitting ◽  
General Purpose ◽  
Freeform Surface ◽  
Domain Expert ◽  
Coordinate Measurement ◽  
Reverse Engineer ◽  
Model Based ◽  
Cad Models ◽  
Feature Based

Reverse engineering (RE) is the process of defining and instantiating a model based on the measurements taken from an exemplar object. Traditional RE is costly, requiring extensive time from a domain expert using calipers and/or coordinate measurement machines to create new design drawings/CAD models. Increasingly RE is becoming more automated via the use of mechanized sensing devices and general purpose surface fitting software. This work demonstrates the ability to reverse-engineer parts by combining feature-based techniques with freeform surface fitting to produce more accurate and appropriate CAD models than previously possible.

Sign in / Sign up

Export Citation Format

Share Document