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The paper discusses the details of developing a systematic method for generative process planning taking environmental issues into consideration. The proposed approach to the automatic design of process planning is based on artificial intelligence techniques coupled with appropriate heuristic searching methods. A case study has been presented to illustrate the methodology.
α-Sn seed was preset on the surface of both the high purity tin (99.999%) and Sn-0.7%Cu ingots, then the samples were kept at −40 V for different times, the surface morphology of the samples was observed to study the process of the β/α transformation. SEM was used to evaluate the degree of the phase transition, while the XRD was applied to identify the product of the transformation The results showed...
CNTs@SiO2 core-shell nanoparticles were synthesized via tetraethyl orthosilicate (TEOS) hydrolyzing and condensing on the CNTs' surface. The effect of reaction parameters, including temperature, time, ratio of the cationic surfactant cetyltrimethyl ammonium bromide (CTAB)/ CNTs, and TEOS/CNTs on the structure of nanoparticles was investigated. Results showed that the optimized temperature, time, ratio...
Superhydrophobic and self-cleaning are the key properties of some species of plant leaves due to the micro-and nano-structures on the surface. In this paper, Berberis thunbergii leaves with nano-hairy and micro-trichomes structures, was used as template for replication. The negative replica was fabricated by casting PDMS on the template, and then positive replica was fabricated by casting UV-photoresist...
In this paper, we present a method to fabricate aluminum alloy 5083 surfaces with different surface roughness using reciprocating type high speed wire cut electrical discharge machining (HS-WEDM). Observe the processed surface by ultra-depth three-dimensional scanning system, obviously notice that craters and bumps were uniformly distributed in the surface which is machined by HS-WEDM. And the size...
Nanodiamonds (NDs) are often considered as inert platforms with high interests for biomedical applications. They are well adapted for drug delivery, and may display embedded fluorescence. We report here on a new way to consider these nanocarbon particles, by revealing therapeutic capacities coming from electronic properties of NDs. With an optimized surface chemistry, the generation of Reactive Oxygen...
NBR is an important material used for the stator of progressing cavity pump. The wear mechanisms of different graphite contents of NBR by 45# steel under different loads were investigated. On MPV-600 computer-controlled abrasive wear testing machine, the coefficients of friction were measured continuously. Results showed that wear loss and friction coefficient of NBR decrease with the increasing of...
The development of high lateral resolution holographic radar imaging has stimulated new research on mapping of exposed dinosaurs and detection of tracks hidden in the uppermost layers of potential track-bearing rocks, as well as for the characterization of rock features around tracks. This project involves experiments on tracksites, museum specimens, and laboratory models from around the world. Preliminary...
In the life of weapon equipment, the stealth coatings will be affected by environmental factors and effects in storage, transportation and any other processes, and it will seriously affect the performance of stealth weapon. Using the quick-repaired wave absorbing material, the stealth coatings' performance such as reflectance can be recovered quickly, and the effect of reflectance could be resumed...
The dependences of ultrasonic energy produced in materials from basic parameters of press and continuous ultrasonic welding are presented in article. There is possibility to provide optimal modes adjusting of energetic parameters of ultrasonic welder equipment and to achieve high efficiency of solving different technological tasks of wares welding.
The paper discusses different automation concepts for the disassembly of surface mounted magnets, and for the removal of the bandaging of rotors. In detail three strategies to recover the magnet bodies of rotors will be presented. Furthermore the paper introduces an innovative disassembly machine, which can handle different variants of the targeted magnets, to avoid the troubles during the manual...
The article is devoted to ultrasonic method of dimensional processing of hard and brittle materials as a graphite widely applied at industry in form of various wares due to its unique features.
The act of surface refurbishment of worn components is of itself both environmentally friendly and something which can be accomplished in a timely and convenient manner. It is environmentally friendly since it conserves both material and energy which would be otherwise expended in producing new components. It thus follows that it is also a convenient time-saver. There are many approaches to surface...
Material science applied to regenerative medicine and tissue engineering study the achievement of biocompatible artificial tissues to improve, self-repair or favour cellular therapies. Various studies prove plasma ability to modify polymeric scaffold surface, with an improvement of hydrophilicity and surface roughness demonstrated by a reduction of contact angle and by an increase of surface energy...
The atmospheric pressure plasma (APP) has been proved with great effectiveness in killing micro-organisms, and this makes it potential use in various biological and medical applications such as sterilization of medical devices, decontamination of biomaterials, and even enhancement of wound healing. Recently, some researchers investigated APP effects in dental care, such as tooth whitening and tooth...
Titanium dioxide (TiO2) has high optical refractive index and is transparent to visible light. No strong reflection is expected from a single layer of continuous TiO2 film. In this work, we report the unusually high reflection from a thick layer of TiO2 nanoparticles. TiO2 nanoparticles of different sizes (~ 21 nm and ~ 400 nm) were deposited on indium tin oxide (ITO) coated glass substrate by electrophoretic...
Unlike traditional methods of micromachining, focused ultrashort laser pulses of sufficiently high fluence makes it possible not only to avoid the majority of side effects, including temperature, but also to create a qualitatively new laser technology for the so-called "hard materials", i.e. glass-carbon.
The objective of the research was to study tribological properties of EN 31 bearing steel. The study focuses on how surface roughness and working temperature affect wear and friction under dry sliding conditions. Experiments were conducted with 3 different loads 10N, 20N and 30N. Milling and grinding technique was used to prepare the samples in order to get different surface roughness values. It is...
This study shows the effect on the morphological structures and surfaces of kenaf fibres after being treated with hydrothermal treatments at three different temperatures using laboratory autoclave. Kenaf fibres were treated using hydrothermal treatments for 30 minutes. The morphology of the kenaf fibres after and before the hydrothermal treatments reveals the true conditions of the kenaf fibres. To...
The tutorial will introduce the mechanisms of materials modification by electronic excitation and will describe theoretical methods and models used for studying the behavior of atoms inside solids and at surfaces under laser excitation.
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