Development of contactless solid state voltage relay

The article deals with the research issues of compact, reliable, high-speed semiconductor solid-state non-contact voltage relays with an increased service life, combining a sensitive system and a powerful actuator with a sinusoidal voltage curve at the load. Theoretical studies of a controlled resistive and non-autonomous dynamic circuit, consisting of a thyristor connected in series with a parallel circuit containing a capacitance and an active resistance, under the influence of an external sinusoidal voltage, which can be used in control circuits of power thyristors, are presented. An experimental characteristic is shown with a description of the operating principle of the developed solid-state non-contact voltage relay.

Approximate Algorithm for Solving the General Problem of Scheduling Theory With High Accuracy

An approximate iterative algorithm is described, allowing the solving of general problems in the theory of schedules. The theoretical and experimental characteristic of the new algorithm are given, as well as ways of finding out its variable indicators by using parallelization computing and the implementation of a parallel version of the algorithm microprocessor. In this way, the authors have described a practical approximate algorithm for time, to solve the general problem of scheduling theory with an average error of 8% less.

Pengaruh Suhu Dan Kepadatan Ephippia Yang Berbeda Terhadap Penetasan Ephippia Daphnia magna

Daphnia magna has good nutrition to carry on egg produce and fry of fish cupang, maskoki, oscar, tetra, and also can used for food source of fry and seed. Daphnia magna not only supply from natural environment, cause their growth deppend on fertilizer as food and environment condition. The other side: high population density, limited of food source low temperature and shorter irradiation can produce dorman egg (ephippia). The dorman eeg can use for Daphnia magna stock which way by hatching. The factor that can be influence for ephippia hatch are temperature and density. Based on this fact, a research about influence of different temperature and ephippia density for ephippia hatch of Daphnia magna. The purpose of this research was to know the influence of different temperature and ephippia density for ephippia hatch of Daphnia magna. This research has experimental characteristic and use Factorial Completely Randomized Design with three experiments of temperature (A factor), three experiments of density (B factor) and three times replicated. There are 9 kinds of combination between density and temperature. The parameter which checked in this research is degree of hatch of ephippia Daphnia magna and water quality that is dissolve oxygen rate, NH3 and of pH hatch media. The result of the analysis showed that the temperature and density influence of hatching Daphnia magna ephippia. The best result can be used for hatching Daphnia magna ephippia is temperature at 25oC with density 50 ephippia /100 ml giving highest result for the hatch of ephippia Daphnia magna. There are interaction betwen temperature and density for hatching.

Динамика поверхностной проводимости в пленках PbSnTe : In с составом вблизи инверсии зон

The features of transient processes under the field effect in PbSnTe:In films with a variation in the current up to a factor of 10^5 are studied at helium temperatures. These features qualitatively correspond to a model, in which a high concentration of traps with different parameters is present on the PbSnTe:In surface. The role of the surface is confirmed by a strong variation in the experimental characteristic after the chemical removal of native oxides from the PbSnTe:In surface and its passivation by an Al_2O_3 layer.

The Metric Structure of Nucleic Acids and the Higher Dimension of Their Constituents

The purpose of the study is to build a metric model of the structure of a nucleic acid molecule, taking into account the higher dimension of its components, the actual lengths of chemical bonds, and the angles between them. Calculations by the constructed model showed the closeness of the known experimental characteristic parameters of the nucleic acid (helix diameter, period length) and the calculated values of these parameters. The internal degree of freedom of the nucleic acid molecule is revealed: the angle of rotation of the phosphoric acid residue relative to the chemical bond connecting it to the five-carbon sugar molecule. It is established that the value of this angle determines the shape of the nucleic acid molecule. It is claimed that the process of transmission of hereditary information and protein synthesis occurs in a space of high dimensionality in ribosomes.