Low-frequency double-resonance quartz crystal oscillator circuit was developed with active inductance aiming the quick start-up in the intermittent operation on the sensor circuit and DC isolation using a Q-MEMS sensing crystal HTS-206. Allan standard deviation indicated 5 × 10−12, showing short range stability of the sensor circuit sufficient for the ubiquitous environmental sensor network.

Diatrizoic acid (DTA), a clinically used X-ray contrast agent, crystallises in two hydrated, three anhydrous and nine solvated solid forms, all of which have been characterised by X-ray crystallography. Single-crystal neutron structures of DTA dihydrate and monosodium DTA tetrahydrate have been determined. All of the solid-state structures have been analysed using partial atomic charges and har...

In the crystal structure of the title compound, C(7)H(10)N(6)O(3), there are N-H⋯O, N-H⋯N and C-H⋯O inter-actions, generating a three-dimensional supra-molecular network structure. A short intermolecular O⋯C contact of 2.8994 (18) Å is alsopresent in the crystal structure, but no π-π contacts are observed.

The crystal structure of the title compound, C(16)H(26)NO(2) (+)·C(18)H(13)O(8) (-), is stabilized by an extensive network of classical N-H⋯O and O-H⋯O hydrogen bonding. The crystal structure also shows an ammonium-driven diastereo-isomerism.

In this paper, a new design of optical channel drop filter based on two- dimensional photonic crystal ring resonators with triangular lattice is proposed. The rods of this structure is silicon with the refractive index 3.46 and the surrounding environment is air with the refractive index of 1.The widest photonic band gap obtained is for filling ratio of r/a = 0.2. The filter’s transmission spec...

In the title compound, C(16)H(13)FO(4), the dihedral angle between the benzene rings is 84.28 (8)°. In the crystal, C-H⋯F and C-H⋯O hydrogen bonds link the mol-ecules to form a three-dimensional network. The crystal structure is consolidated by C-H⋯π inter-actions and short F⋯F contacts [2.7748 (14) Å] also occur.

In the title compound, C(12)H(13)N(3)O(2), the dihedral angle between the pyrazole and benzene rings is 50.0 (3)°. In the crystal, mol-ecules are linked by inter-molecular N-H⋯O hydrogen bonds to form a three-dimensional network. Two weak C-H⋯π inter-actions reinforce the crystal packing.

Understanding a simple crystal oscillator transmitter circuit The transistor in common emitter configuration contributes -180 deg phase shift between base. Write short notes on (i) RC Oscillator (ii) Wien bridge Oscillator (iii) Crystal It consists of a conventional single transistor amplifier and a RC phase shift network. The wien-bridge oscillator is the standard oscillator circuit for all fr...

Magmas and other suspensions that develop sample-spanning crystal networks undergo a change in rheology from Newtonian to Bingham flow due to the onset of a finite yield stress in the crystal network. Although percolation theory provides a prediction of the crystal volume fraction at which this transition occurs, the manner in which yield stress grows with increasing crystal number densities is...