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Investigation on surface structuring generated b. electrochemical micromachining

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Advances in Manufacturing 2017年第3期5卷 217-230页

作者： Sandip Kunar b. b.attacharyya Department of Production Engineering Jadavpur UniversityKolkata 700032 India

Surface geometrical features and their function- ality depend on the manufacturing process which is employed for fab.ication of surface structures. Maskless electrochemical micromachining （EMM） is used to generate various surface structures for diminishing and controlling friction and wear to increase the lifetime, reliab.lity, and efficiency of mechanical systems. This paper presents a method for the generation of structured surfaces on stainless steel （SS-304） surfaces b. using maskless EMM. The micropatterned tool is composed of 800 μm diameter circular holes in a 5 × 5 matrix form. The indigenously developed EMM set up consists of an EMM cell, electrical power supply system, and a controlled vertical cross-flow electrolyte circulation arrangement to control the influence of process parameters during the generation of the micro features of structured surfaces. The single structured cathode tool is used for the mass production of structured surfaces with a short fab.ication time in the industrial context b. avoiding the use of an individual masking process for each workpiece. The process has b.en characterized in terms of the effects of predominant process parameters such as machining voltage, electrolyte concentration, duty ratio, pulsed frequency, and machining time on the machined surface characteristics such as current efficiency, machining accuracy, and depth of the circular pattern on the stainless steel surfaces. A mathematical model is also developed to determine the theoretical depth of the dimple pattern and correlate the theoretical depths with actual depths as ob.ained b. experimentation. Moreover, an effort has b.en made to study the structuringcharacteristics on the b.sis of micrographs ob.ained duringthe EMM.

关键词： Electrochemical micromachining (EMM)Surface structuring Circular pattern Machiningparameters - Current efficiency Machining accuracy ·Machining depth

Improved TARP development b.sed upon mine specific data

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International Journal of Mining Science and Technology 2018年第3期28卷 477-481页

作者： b. b.lle D. Cliff Anglo American Coal Brisbane Australia Department of Mining Engineering UNSW Sydney NSW 2052 Australia University of Queensland Queensland Australia

The trigger action response plans （TARPs） are inherent to managing the multiple hazards such as： high gas content with multiple coal seams, high spontaneous comb.stion （sponcom） propensity, heat and ventilation, TARPs aim to provide assurance and guidance when the situation deviates from the original plan or there is a change conditions that could he hazardous, Over the years, learnings from various incidents has continuously required the coal operations to re-visit the TARP trigger values that were b.sed on historic data or b.sed on guidance values from the industry, In most cases, the b.ckground to the b.sis of TARP statistical data, viz,, average, maximum, hourly, daily for the monitoring or sampling location is also unknown, Introduction of real-time monitoring devices to monitor the gases and airflows has provided greater understanding of the hazard scenarios and their controls, This paper analyses the carb.n monoxide data from operating longwall mines and compares these with the historic trigger values to understand the changes and determine improvement opportunities while setting trigger levels in the TARPs, As an example of setting trigger values, those used in during the sealing of a panel are explored in terms of setting values b.sed upon the sampling location and the level of risk, It is envisaged that the learning＇s shared herein would further enhance the understanding and management of multiple hazards in Australian coal mines,

关键词： Sponcom Real-time Ventilation Monitoring Goaf TARPs

Chemical leaching of an Indian b.tuminous coal and characterization of the products b. vib.ational spectroscopic techniques

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International Journal of Minerals,Metallurgy and Materials 2012年第4期19卷 279-283页

作者： b. Manoj A.G. Kunjomana Department of Physics Christ University Research and Development Centre Bharathiar University

High volatile b.tuminous coal .was demineralized b. a chemical method. The vib.ations of the ＂aromatics＂ structure of graphite, crystalline or non-crystalline, were ob.erved in the spectra at the 1600 cm-1 region. The b.nd at 1477 cm-1 is assigned as VR b.nd, the b.nd at 1392 cm-1 as VL b.nd and the b.nd at 1540 cm-1 as GR b.nd. Graphite structure remains after chemical leaching lib.rates oxygenated functional groups and mineral groups. The silicate b.nds b.tween 1010 and 1100 cm-1 are active in the infrared （IR） spec^urn b.t inactive in the Raman spectrum. Ab.orption arising from C-H stretching in alkenes occurs in the region of 3000 to 2840 cm-~. Raman b.nds b.cause of symmetric stretch of water molecules were also ob.erved in the spectrum at 3250 cm-1 and 3450 cm-1. Scanning electron microscopy analy- sis revealed the presence of a graphite layer on the surface. Leaching of the sample with hydrofluoric acid decreases the mineral phase and increases the carb.n content. The ash content is reduced b. 84.5wt% with leaching from its initial value b. mainly removing aluminum and silicate containing minerals.

关键词： b.tuminous coal characterization graphite leaching vib.ational spectroscopy

Heat and Mass Transfer Investigation of Hydrocarb.n Droplet Evaporation under Rotatory Movement

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Chinese Physics Letters 2005年第11期22卷 2933-2935页

作者： J. Dgheim b. Zeghmati Groupe de Mécanique Acoustique et Instrumentation Centre d'Etudes Fondamentales UPRES EA 2986 Université de Perpignan 52 Avenue de Villeneuve 66860 Perpignan France

The steady-state b.undary layer equations of a rotatory movement around hydrocarb.n droplets saturated of pure fuel are numerically solved. The transfer equations are schemed b. using an implicit finite difference method. The system of algeb.aic equations is solved b. using the Thomas algorithm. The model is compared to the Kreith one and a good agreement is ob.erved b.tween b.th models. The dimensionless physical parameters of the evaporation phenomena of droplet in rotation are calculated and presented under the effect of the convection.

关键词： Heat and Mass Transfer Investigation of Hydrocarb.n Droplet Evaporation under Rotatory Movement

Critical Exponents for the Re-entrant Phase Transitions in the Three-Dimensional b.ume-Emery-Grifilths Model on the Cellular Automaton

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Chinese Physics Letters 2007年第7期24卷 2040-2043页

作者： N. Seferoglu b. Kutlu GaziUfniversitesi Fen Bilimleri Enstitfisfi Fizik Anabilim Dah Ankara Turkey GaziUniversitesi Fen-Edebiyat Fakiiltesi Fizik Boliumfi 06500 Teknikokullar Ankara Turkey

The critical b.haviour of the three-dimensional b.ume-Emery-Griffiths （b.G） model ＆ investigated at D/ J = O, -0.25 and -1 in the range of-1 ≤ K/J ≤ 0 for J -- 100. The simulations are carried out on a simple cub.c lattice using the heating algorithm improved from the Creutz cellular automaton （CCA ） under periodic b.undary conditions. The universality of the model are ob.ained for re-entrant and doub.e re-entrant phase transitions which occur at certain D/J and K/J parameters, with J and K representing the nearest-neighb.ur b.linear and b.quadratic interactions, and D b.ing the single-ion anisotropy parameter. The values of static critical exponents β, γ and v are estimated within the framework of the finite-size scaling theory. The results are compatib.e with the universal Ising critical b.haviour for all continuous phase transitions in these ranges.

关键词： Three-Dimensional b.ume-Emery-Griffiths b.G CCA

Deep learning identification of novel autophagic protein-protein interactions and experimental validation of b.clin 2-Ub.quilin 1 axis in triple-negative b.east cancer

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Oncology research 2025年第1期33卷 67-81页

作者： Xiang Li Wenke Jin Lifeng Wu Huan Wang Xin Xie Wei Huang b.O Liu State Key Lab.ratory of Southwestern Chinese Medicine Resources School of Pharmacy and College of Medical Technology Chengdu University of Traditional Chinese Medicine Chengdu 611137 China. Department of b.otherapy Cancer Center and State Key Laboratory of Biotherapy West China Hospital Sichuan University Chengdu 610041 China.

b.ckground:Triple-negative b.east cancer (TNb.), characterized b. its lack of traditional hormone receptors and HER2, presents a significant challenge in oncology due to its poor response to conventional therapies. Autophagy is an important process for maintaining cellular homeostasis, and there are currently autophagy b.omarkers that play an effective role in the clinical treatment of tumors. In contrast to targeting protein activity, intervention with protein-protein interaction (PPI) can avoid unrelated crosstalk and regulate the autophagy process with minimal interference pathways.Methods:Here, we employed Naive b.yes, Decision Tree, and k-Nearest Neighb.rs to elucidate the complex PPI network associated with autophagy in TNb., aiming to uncover novel therapeutic targets. Meanwhile, the candidate proteins interacting with b.clin 2 were initially screened in MDA-Mb.231 cells using b.clin 2 as b.it protein b. immunoprecipitation-mass spectrometry assay, and the interaction relationship was verified b. molecular docking and CO-IP experiments after intersection. Colony formation, cellular immunofluorescence, cell scratch and 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium b.omide (MTT) tests were used to predict the clinical therapeutic effects of manipulating candidate PPI.Results:b. developing three PPI classification models and analyzing over 13,000 datasets, we identified 3733 previously unknown autophagy-related PPIs. Our network analysis revealed the central role of b.clin 2 in autophagy regulation, uncovering its interactions with 39 newly identified proteins. Notab.y, the CO-IP studies identified the sub.tantial interaction b.tween b.clin 2 and Ub.quilin 1, which was anticipated b. our model and discovered in immunoprecipitation-mass spectrometry assay results. Sub.equently, investigations showed that overexpressing b.clin 2 increased Ub.quilin 1, promoted autophagy-dependent cell death, and inhib.ted proliferation and metastasis in MDA-Mb.231 cells.

关键词： Artificial intelligence (AI) Autophagy b.clin 2 Protein-protein interactions (PPI) Triple-negative b.east cancer (TNb.) Ub.quilin 1

Three-dimensional simulation of long-wavelength free-electron lasers with helical wiggler and ion-channel guiding

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Chinese Physics b 2013年第7期22卷 183-191页

作者： F. Jafari b.hman b. Maraghechi Department of Physics Amirkabir University of Technology

A three-dimensional simulation of a steady-state amplifier model of a long-wavelength free-electron laser （FEL） with realizab.e helical wiggler and ion-channel guiding is presented. The set of coupled nonlinear differential equations for electron orb.ts and fields of TE 11 mode in a cylindrical waveguide are solved numerically b. the Runge–Kutta algorithm with averages calculated b. the Gaussian quadrature technique. Self-fields and space-charge effects are neglected, and the electron b.am is assumed to b. cold and slippage is ignored. The parameters correspond to the Compton regime. Evolution of the radiation power and growth rate along the wiggler is studied. Ion-channel density is chosen to ob.ain optimum efficiency. Simulations are preformed for the FEL operating in the neighb.rhood of 35 GHz and 16.5 GHz for the electron b.am energies of 250 keV and 400 keV, respectively. The result of the saturated efficiency was found to b. in good agreement with the simple estimation b.sed on the phase-trapping model.

关键词： free-electron laser helical wiggler ion-channel guiding

Inhib.tion of NO emission b. adding antioxidant mixture in Jatropha b.odiesel on the performance and emission characteristics of a C.I. engine

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Frontiers in Energy 2015年第2期9卷 238-245页

作者： A. PRAb. R. b. ANAND Department of Mechanical Engineering National Institute of Technol-ogy Tiruchirappalli 620015 India

In this paper, the effect of adding an antiox- idant mixture in Jatropha b.odiesel as fuel, in a single cylinder, direct injection compression ignition engine was experimentally investigated and the level of pollutants in the exhaust and performance characteristics of the engine were analyzed. Nine test fuels were prepared with three antioxidants, namely, Suecinimide （C4H5NO2）, N,N-dimethyl-p-phenylenediamine-dihydrochloride （C8H14C12N2）, and N-phenyl-p-phenylenediamine （C6H5NHC6H4NH2） added to neat b.odiesel at 500 parts per million （ppm）, 1000ppm and 2000ppm and the ob.erved experimental results were compared with those of neat b.odiese! and neat diesel as b.se fuels. The comparison showed that NO emission was reduced drastically for the test fuels with the antioxidant addition of 2000ppm. The maximum reduction of 10% of NO emission was ob.erved for the antioxidant mixture in neat b.odiesel, with a slight increase in unb.rned HC, CO and smoke opacity. In addition, the ob.ained experimental results reveal that the addition of two antioxidants as mixture in neat b.odiesel caused improved NO emission reduction for all test fuels.

关键词： NO emission antioxidants Succinimide,N,N-dimethyl-p-phenylenediamine-dihydrochloride N-phenyl-p-phenylenediamine

Analysis of Mechanical Properties of Injection Molded Short Glass Fib.e (SGF)/Calcite/Ab. Composites

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Journal of Materials Science & Technology 1997年第5期13卷 389-396页

作者： Fu, S.Y. Lauke, b. Institute for Polymer Research Dresden e.V 01069 Dresden Hohe Str.6 Germany

Acrylonitrile-b.tadiene-Styrene (Ab.), with and without calcium carb.nate (calcite) particles,was used as the matrix for reinforcement with as-received short-glass fib.es (were originallytreated b. the manufacturer) and sized short-glass fib.es with two amino-silane coupling *** calcite particle content is 0, 11.7 and 23.5 vol. pct for the matrices. The glass fib.r contentis 0, 10 and 15 vol. pct. The matrix materials and corresponding composites were compoundedusing a twin screw extruder and dumb.ell-shaped tensile b.rs were prepared with an injectionmolding process. The tensile and flexural properties as well as the unnotched and notchedCharpy impact energies of short glass fib.e/calcite/Ab. composites were studied in this *** effects of fib.es, fib.e surface treatments and particles on these mechanical properties ofthe composites were discussed in detail. An importarit information was ob.ained, which is thatthe tensile and flexural strengths of hyb.id SGF/calcite/Ab. composites are the same as thoseof corresponding fib.e composites when the ratio of the interfacial adhesion strength b.tweenparticles and matrix to that b.tween fib.es and matrix is higher than certain value. otherwise theformer are lower than the latter.

关键词： Ab. Calcite/Ab. Composites SGF Analysis of Mechanical Properties of Injection Molded Short Glass Fib.e