یکی از جذاب ترین روش های ماشینکاری مدرن، تخلیه الکتریکی است که در اواخر دهه 1960 معرفی شد. با سیم کاربردهای مختلفی دارد، جمله دقت بالا تمام مواد رسانا مانند فلزات، آلیاژهای فلزی، گرافیت و سرامیک همچنین صنایع هوافضا، خودروسازی سایر صنایع. به منظور افزایش سرعت کاهش زبری سطح عرض شکاف، پارامترهای برش بهینه نقش مهمی انتخاب خروجی دارند. این مطالعه، ورودی (دبی، مدت پالس، فرکانس سیم، کشش جریان دی الکتر...

The complexes formed by H2CO, CH3CHO, and (CH3)2CO with 1, 2, and 3 molecules of CO2 are studied by ab initio calculations. Three different types of heterodimers are observed, most containing a tetrel bond to the C atom of CO2, and some supplemented by a CH⋅⋅O H-bond. One type of heterodimer is stabilized by an anti-parallel arrangement of the C=O bonds of the two molecules. The binding energie...

Upon ratification, the recent climate treaty negotiated in Kyoto, Japan, would require the United States and other developed nations to reduce their emissions of greenhouse gases below 1990 levels by the year 2010. Because most anthropogenic greenhouse-gas emissions (particularly CO2) come from the use of fossil energy, this agreement has the potential to affect the entire fabric of society. He...

Optical absorption and emission studies have been carried out to understand the effect of deuterium on the solvent dependent photophysical properties of curcumin in deuterated solvents such as CDCl3, (CD3)2SO, (CD3)2CO, CD3OD and CD3CN. Optical absorption spectral studies showed that there is no significant shift in absorption maxima compared to the non-deuterated solvent. The fluorescence maxi...

Charge disproportionation (CD) and spin differentiation in Na(1/2)CoO2 are studied using the correlated band local-density approximation + Hubbard U (LDA+U) approach. The simultaneous CD and gap opening seen previously is followed in detail through a first-order charge disproportionation transition 2Co(3.5+)-->Co3++Co4+. Disproportionation in the Co a(g) orbital results in half of the ions (Co3...

Estudios recientes sobre el léxico de la gracia a partir las convenciones greco-romanas del honor, euergetismo y patronazgo han aportado nuevas intuiciones para comprender afirmaciones Pablo divina. Tras describir dichas convenciones, artículo trata algunos textos (1Co 15,8-10; 2Co 12,9; Ga 1–2); los pasajes gratuidad su labor (1Ts 2,9; 1Co 9,1-18; 11,7-11; 12,14-18; 2Ts 3,9), en que habla prim...