Design for Disassembly and the Value of Robotic Semi-Destructive Disassembly

2002 ◽  
Author(s):  
John Reap ◽  
Bert Bras
Keyword(s):  
Long Range ◽  
Experimental Results ◽  
Consumer Product ◽  
Material Flows ◽  
Design For Disassembly ◽  
General Design ◽  
Prevailing View ◽  
Environmental Importance

This article explores robotic semi-destructive disassembly’s relationship with design for disassembly, and the article investigates its value as a disassembly approach for remanufacture and / or recycling. Specifically, the compatibility of design for disassembly guidelines with semi-destructive disassembly is explored. Regulatory pressures, recovering the value of products’ materials and the long-range environmental importance of cycling material flows motivate the exploration. The article compares general design for disassembly guidelines drawn from the literature with experimental results from the semi-destructive disassembly of a simple consumer product. Additionally, the value of semi-destructive disassembly is investigated. The prevailing view of semi-destructive disassembly’s value is discussed, and the realities of an experimental semi-destructive disassembly study are contrasted with these beliefs.

Roaming Reactions and Dynamics in the van der Waals Region

2020 ◽  
Vol 71 (1) ◽  
pp. 77-100 ◽  
Author(s):  
Arthur G. Suits
Keyword(s):  
Long Range ◽  
Internal State ◽  
Chemical Reactivity ◽  
Van Der Waals ◽  
Quantum Effects ◽  
Experimental Results ◽  
Unexpected Formation ◽  
Chemical Systems ◽  
Definition Of

Roaming reactions were first clearly identified in photodissociation of formaldehyde 15 years ago, and roaming dynamics are now recognized as a universal aspect of chemical reactivity. These reactions typically involve frustrated near-dissociation of a quasibound system to radical fragments, followed by reorientation at long range and intramolecular abstraction. The consequences can be unexpected formation of molecular products, depletion of the radical pool in chemical systems, and formation of products with unusual internal state distributions. In this review, I examine some current aspects of roaming reactions with an emphasis on experimental results, focusing on possible quantum effects in roaming and roaming dynamics in bimolecular systems. These considerations lead to a more inclusive definition of roaming reactions as those for which key dynamics take place at long range.

Magnetization and Curie Temperature of Ferromagnetic Ultrathin Films: The Influence of Magnetic Anisotropy and Dipolar Interactions (invited)

1991 ◽  
Vol 231 ◽  
Author(s):  
P. Bruno
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Curie Temperature ◽  
Magnetic Anisotropy ◽  
Long Range ◽  
Ultrathin Films ◽  
Experimental Results ◽  
Dipolar Interactions ◽  
Surface Gradient ◽  
Theoretical Investigations

AbstractTheoretical investigations of the magnetization and Curie temperature of ferromagnetic ultrathin films in the presence of magnetic anisotropy and long-range dipolar interactions are presented. The Curie temperature of fcc (001) cobalt ultrathin films is calculated and compared with experimental results on Co/Cu (001) films. The influence of an external magnetic field, and the surface gradient of the magnetization are also discussed.

Selective separation and recovery of silver and copper from mixtures by photocatalysis

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744096
Author(s):  
Mali Ding ◽  
Weijun Zhang ◽  
Zhaofeng Xie ◽  
Rihua Lei ◽  
Jianfang Wang ◽  
...  
Keyword(s):  
Metal Ions ◽  
Ethylene Diamine Tetraacetic Acid ◽  
Uv Light ◽  
Electronic Waste ◽  
Experimental Results ◽  
Tetraacetic Acid ◽  
Selective Recovery ◽  
Valuable Metals ◽  
Effects Of Ph ◽  
Environmental Importance

Separation and recovery of valuable metals including silver (Ag) and copper (Cu) from electronic waste mixtures are of great economic and environmental importance. Recent years, semiconductor photocatalysts have been investigated intensively for the removal of Ag from wastewater. Few studies have been carried out on the effect of pH and co-exist metal ions such as Cu on Ag. In this study, ZnO and TiO2 were applied as photocatalysts to target on the selective recovery Ag and Cu from its mixtures under UV light. The effects of pH, catalyst, ethylene-diamine tetraacetic acid (EDTA) on the Ag and Cu photo-reduction were studied. Modeling of Ag[Formula: see text] and Cu[Formula: see text] with and without EDTA distribution together with metal precipitations was plotted against pH to understand the chemistry involved in photocatalysis. Experimental results showed that Ag[Formula: see text] photo-reduction was nearly completed by ZnO and TiO2 to Ag metal, while Cu[Formula: see text] photo-reduction to Cu2O only occurs by ZnO in the presence of EDTA. This work illustrates that semiconductor photocatalysts are suitable for selective recovery of Ag and Cu from wastewaters.

Experimental results concerning long-range light particles and fragments in the ternary fission of233U,235U,239Pu and252Cf

1972 ◽  
Vol 11 (3) ◽  
pp. 716-724 ◽  
Author(s):  
M. Cambiaghi ◽  
F. Cavallari ◽  
F. Fossati ◽  
F. Jappelli ◽  
C. Petronio ◽  
...  
Keyword(s):  
Long Range ◽  
Experimental Results ◽  
Ternary Fission ◽  
Fission Of233u ◽  
Light Particles

An Investigation of Long-range Proton–Proton Coupling Constants in Phenylacetylene Derivatives

1972 ◽  
Vol 50 (13) ◽  
pp. 2035-2040 ◽  
Author(s):  
C. J. MacDonald ◽  
G. K. Hamer ◽  
I. R. Peat ◽  
W. F. Reynolds
Keyword(s):  
Hyperfine Interaction ◽  
Long Range ◽  
Excellent Agreement ◽  
Quantitative Estimation ◽  
Theoretical Calculations ◽  
Experimental Results ◽  
Coupling Constants ◽  
Proton Proton ◽  
Proton Coupling

Signs and magnitudes of long-range coupling constants in three phenylacetylene derivatives have been determined. Values of the coupling constants are discussed in terms of the McConnell formulation and compared with results of MO–INDO–FPT calculations. Coupling constants are dominated by π contributions. Estimated values of hyperfine interaction constants for acetylene and methylacetylene groups are respectively QCC≡CH = −12 and QCC≡CCH = +12 G. The theoretical calculations are in excellent agreement with experimental results. Both approaches allow quantitative estimation of nine bond couplings in 4-vinylphenylacetylene.

Laser long-range remote-sensing program experimental results

1995 ◽  
Author(s):  
Ronald G. Highland ◽  
Michael L. Shilko, Sr. ◽  
Marsha J. Fox ◽  
John D. Gonglewski ◽  
Stanley R. Czyzak ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Long Range ◽  
Experimental Results

Long range interactions and related C-C bonds reconstruction between interior and surface defects in nanodiamonds

2021 ◽  
Author(s):  
Boukhvalov Danil W ◽  
Vladimir Yu Osipov ◽  
Kazuyuki Takai
Keyword(s):  
Long Range ◽  
Surface Defects ◽  
Experimental Results ◽  
Dangling Bonds ◽  
Long Range Interactions

Interactions between interior substitutional nitrogen defects and surface unsaturated dangling bonds in synthetic nanodiamonds of ~25 nm size were explored experimentally and theoretically. The experimental results demonstrate the disappearance of...

Long-range time reversal communication in deep water: Experimental results

2012 ◽  
Vol 132 (1) ◽  
pp. EL49-EL53 ◽  
Author(s):  
T. Shimura ◽  
Y. Watanabe ◽  
H. Ochi ◽  
H. C. Song
Keyword(s):  
Long Range ◽  
Deep Water ◽  
Time Reversal ◽  
Experimental Results

scholarly journals Modelling stripe formation in zebrafish: an agent-based approach

2015 ◽  
Vol 12 (112) ◽  
pp. 20150812 ◽  
Author(s):  
Alexandria Volkening ◽  
Björn Sandstede
Keyword(s):  
Laser Ablation ◽  
Pattern Formation ◽  
Long Range ◽  
Pigment Cell ◽  
Experimental Results ◽  
Fish Growth ◽  
Pigment Cells ◽  
Stripe Pattern ◽  
Agent Based ◽  
Long Range Interactions

Zebrafish have distinctive black stripes and yellow interstripes that form owing to the interaction of different pigment cells. We present a two-population agent-based model for the development and regeneration of these stripes and interstripes informed by recent experimental results. Our model describes stripe pattern formation, laser ablation and mutations. We find that fish growth shortens the necessary scale for long-range interactions and that iridophores, a third type of pigment cell, help align stripes and interstripes.

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