The use of Zeeman perturbed ▫$^{14}$▫N nuclear quadrupole resonance (NQR) to determine the ▫$\nu_+$▫ and ▫$\nu{-}$▫ ▫$^{14}$▫N lines in polycrystalline samples with several nonequivalent nitrogen atoms was investigated. The ▫$^{14}$▫N NQR line shift due to a weak external Zeeman magnetic field was calculated, assuming isotropic distribution of EFG tensor directions. We calculated the broad line distribution of the ▫$\nu_+$▫ and ▫$\nu{-}$▫ line shifts and experimentally confirmed the calculated Zeeman field dependence of singularities (NQR peaks) in cyclotrimethylenetrinitramine (RDX) and aminotetrazole monohydrate (ATMH). The calculated and measured frequency shifts agreed well. The proposed measurement method enabled determination of which ▫$^{14}$N▫ NQR lines in ATMH belong to ▫$\nu_+$▫ and which to ▫$\nu_-$▫ transitions.
COBISS.SI-ID: 16000089
The field application of a ▫$^{14}$▫N nuclear quadrupole resonance (NQR) detector needed for the detection of different explosives, including trinitrotoluene (TNT), requires the examination of the distribution of ▫$^{14}$▫N NQR lines stemming from the monoclinic and/or orthorhombic modifications of TNT, as well as from a mixture of both. In this work, 30 different TNT samples up to 70 years old were measured. The main result of this study is that the measured ▫$^{14}$▫N NQR spectrum is strongly influenced by the environmental conditions to which the explosive was subject during its history.
COBISS.SI-ID: 15313753
Underwater radar was developed that can observe geological structures below the river or lake bottom. Furthermore, it can measure through several meters of water, and detect objects buried at the bottom as well as geological structures. The reflected radar signal was measured up to 5 meters below the lake bottom at the Lake Podpeč near Ljubljana, Slovenia.
COBISS.SI-ID: 24869671
Sulfate of copper(II) is known for millennia. The related AuSO4 has been known for a decade, while very recently within the collaboration with Polish researchers we finally succeeded to synthesis the related sulfate of silver(II). The AgSO4 shows many different chemical and physical properties in comparisson with the related copper and gold compounds. The chains of Ag (II) ions compose a 3-dimensional network which is reflected in unusual and interesting magnetic properties: a very strong intrachain antiferromagnetic interaction between the Ag(II) ions.
COBISS.SI-ID: 23410215
We present a concept of a new kind of memory element, a thermal memory cell, where a byte of digital information is stored into the storage medium by pure thermal manipulation. Thermal inscription of information employs a specific temperature-time profile that involves continuous cooling and isothermal waiting time periods. Our storage media are magnetically frustrated solids. We succeeded to thermally write arbitrary ASCII code. Besides for data storage, the concept may be employed for secure data transfer and for retrieving cosmological information from extraterrestrial dust particles.
COBISS.SI-ID: 22832167