Simply connected compact Kähler manifolds of dimension up to three with elliptic homotopy type are characterized in terms of their Hodge diamonds. This is applied to classify the simply connected Kähler surfaces and Fano threefolds with elliptic homotopy type.

In this paper, we consider the well-known modal logics K, T, K4, and S4, and we study some of their sub-propositional fragments, namely the classical Horn fragment, the Krom fragment, the so-called core fragment, defined as the intersection of the Horn and the Krom fragments, plus their sub-fragments obtained by limiting the use of boxes and diamonds in clauses. We focus, first, on the relative...

Chemical Vapor Deposited (CVD) diamond has great advantages for use as thermoluminescent dosimeters in radiotherapy environment because of the reproducible high quality and controlled doping. This study compares CVD diamond Thermally Stimulated Luminescence response to that of a classical ionization chamber. Clinicallyrelevant features like the depth-dose distributions as well as the absorbed d...

A simplified version of the specific contact resistance measurement scheme of G. K. Reeves [Solid State Electronics 23, 487 (1980)] has been developed. Its applicability to semiconducting diamond is demonstrated using four sample types: epitaxial films doped to mid 1019 acceptors/cm3 on (100) and (110) type IIa substrates; type IIb diamonds 0.25 mm thick, and type IIb diamonds thinned to 0.035-...

Most of Earth's diamonds are connected with deep-seated mantle rocks; however, in recent years, μm-sized diamonds have been found in shallower metamorphic rocks, and the process of shallow-seated diamond formation has become a hotly debated topic. Nanodiamonds occur mainly in chondrite meteorites associated with organic matter and water. They can be synthesized in the stability field of graphit...

Diamonds formed during the Proterozoic and Archaean and are in-homogenously distributed in the mantle below Archaean cratons. Kimberlite magmas usually form well within the diamond stability field and physically incorporate seemingly random amounts of diamonds during their ascent through the mantle. The diamond content of a kimberlite magma arriving at the earth’s surface is defined by ascent p...

Color induction in nitrogen-contaminated diamonds was carried out via various procedures that involve irradiation, thermal treatments (annealing), and more. These affect vacancy defect production atom orientation centers the diamond lattice. Natural underwent color enhancement order to produce green, blue, yellow fancy diamonds. The aim of this study follow changes occurring during treatment, m...

It is commonly assumed that countries are blessed if they have an abundant reserve of natural resources. Poorer countries may be jealous of the luxurious living standard that comes from oil in the Middle East, which seems to be an easy success. At the same time, we are amazed at how gold and diamonds are concentrated in African countries through our classes in geography. However, despite such h...

You sit with a deck of fifty-two cards in front of you, face down. You flip the first card: a 10 of diamonds. What are the odds of that? One out of fifty-two. Remarkable. You flip the next card: a queen of hearts. Unbelievable! The odds of this sequence were 1/52 * 1/51 (less than 1 in 2000). You continue flipping cards: a 4 of clubs follows, then an 8 of diamonds, then an 8 of hearts. Once you...

Electrochemical oxidation of oxalic acid has been investigated at bare, highly boron-doped diamond electrodes. Cyclic voltammetry and flow injection analysis with amperometric detection were used to study the electrochemical reaction. Hydrogen-terminated diamonds exhibited well-defined peaks of oxalic acid oxidation in a wide pH range. A good linear response was observed for a concentration ran...