Interaction Products in the System Sulfur Dioxide–2,2′-Bipyridine–Water. Van der Waals Clathrates

Crystallization of 2,2′-bipyridine from aqueous solution containing sulfur(IV) oxide afforded clathrates with the composition (bipy)k·(SO2)m·(H2O)n. X-Ray amorphous guest SO2 molecules occupy voids in the crystal lattice of 2,2′-bipyridine without distortion of its structure. The isolated compounds were characterized by elemental analyses, X-ray diffraction data, and IR, NMR, and mass spectra

Onium Sulfates and Hydrogen Sulfates: Products of Reactions of Sulfur(IV) Oxide with Aqueous Solutions of Alkylamines and Aniline

The reaction products formed in the SO2–L–H2O–O2 systems (L is n-propylamine, n-butylamine, tert-butylamine, n-heptylamine, n-octylamine, aniline) were isolated and identified as “onium” salts [n-C3H7NH3]2SO4, [n-C4H9NH3]2SO4, [t-C4H9NH3]2SO4, [n-C7H15NH3]3SO4(HSO4), [n-C8H17NH3]3SO4(HSO4), and [C6H5NH3]2SO4. The products were characterized by elemental analysis, IR and Raman spectroscopy, mass spectrometry, and thermogravimetry

Complexing of Sulfur(IV) Oxide with Hexamethylenetetramine and Hexamethylenediamine in Aqueous Solutions

Interaction in the sulfur(IV) oxide–hexamethylenetetramine (hexamethylenediamine)–water systems was studied by pH-, redox-, and conductometric titration techniques. The structure and stability of the resulting molecular and ionic complexes were examined in relation to the nature and concentration of the components in solution, as well as to temperature

Synthesis and Structure of N(Hydroxyethyl)ethylenediammonium Sulfite Monohydrate

A reaction between sulfur(IV) oxide and aqueous N(2hydroxyethyl)ethylenediamine yields onium sulfite of composition (HOCH2CH2NH2CH2CH2NH3)SO3 ⋅ H2O, which has been characterized by Xray diffraction, IR spectroscopy, and mass spectrometry. The threedimensional structure of the salt is stabilized by numerous hydrogen bonds, such as NH⋅⋅⋅O and OH⋅⋅⋅O

Synthesis, Spectral Characteristics, and Some Properties of Methylammonium Sulfamate Monohydrate. A New Route to Sulfamic Acid Derivatives

Abstract—Redox transformations of the products of reactions of the CH3C(S)NH2–SO2–H2O system components yield methylammonium sulfamate monohydrate [CH3NH3] +[OSO2NH2] – H2O and elemental sulfur. The synthesized compound was characterized by IR, 1 H and 13C NMR, and mass spectroscopy and some of its properties were studied

The influence of the methods of surface plastic deformation on the peculiarities of fatigue and corrosion: fatigue failure of alloy D16T

The influence of surface plastic deformation obtained by shot-peening and roller burnishing on the fatigue, corrosion fatigue of an aluminum alloy D16T was investigated. The investigations of fatigue and corrosion fatigue were conducted on the specimens with working part: diameter - 10 mm and length - 55 mm in air, 3% NaCl solution and distilled water with complete immersion of specimen. The base of research in air was practically conducted to 107 cycles and in corrosion environment to 5×107 cycles. Surface plastic deformation increases fatigue limit (s-1) of alloy D16T on 30 %, and corrosion fatigue limit (s-1c) on 20 % after shot-peening and 50 % after roller burnishing. Mechanism and character of alloys fracture under conditions of fatigue and corrosion fatigue are analysed

КОРЕКЦІЯ ДИСБІОЗУ КИШЕЧНИКА У ХВОРИХ, ОПЕРОВАНИХ З ПРИВОДУ РАКУ ШЛУНКА

SUMMARY. The paper presents the results of changes of the intestinal microflora of the large intestine in different stages of tumor before and after treatment. Especially important to the timely identification and treatment of intestinal candidosis, as prevention of systematic and generalized candidosis in patients with high-risk groups, which primarily include patients who take out radial anti-tumor and / or chemotherapy. After treatment in patients with stomach cancer there was observed a reduced number of dysbiosis colon and reduce intestinal candidosis that facilitates the quality of life of patients.РЕЗЮМЕ. У роботі представлені результати зміни показників кишкової мікрофлори товстої кишки на різних стадіях пухлинного процесу до та після лікування. Особливо важливі вчасне розпізнання та терапія кишкового кандидозу, як профілактика системного та генералізованого кандидозу у пацієнтів із груп ризику, до яких насамперед належать пацієнти, які отримують протипухлинну променеву та/або хіміотерапію. Після лікування у хворих на рак шлунка спостерігали зменшення дисбіозу товстої кишки, а також зменшення кишкового кандидозу, що дозволяє поліпшити якість життя пацієнтів

Asymptotic properties of the three-Coulomb-center problem eZ1ZZ

An analytic study is presented of the asymptotic properties of the three-Coulomb-center problem eZ(1)ZZ. The electron energies and wave functions of this system, where e designates an electron and Z, Z(1) are bare nuclei, are calculated asymptotically exactly for large distances L between the fragments of a quasimolecular system. The electron exchange interaction between eZZ and Z(1) fragments is also calculated asymptotically exactly and used to estimate the electron-capture cross section in slow collisions of Z=1 and Z(1)=2,3,4 systems

Eddy current test system with digital impedance converter

Zwiększenie dokładności i funkcjonalności układów pomiarowych stosowanych w wyspecjalizowanych miernikach wiroprądowych, możliwe jest poprzez wykorzystanie coraz szerszego asortymentu układów scalonych analogowych, analogowo-cyfrowych oraz zastosowanie cyfrowej techniki przetwarzania sygnałów. Poniżej przedstawiony został komputerowy system pomiarowy przystosowany do współpracy z czujnikiem wiroprądowym transformatorowym z wykorzystaniem układu AD5933, mikrokontrolera oraz zastosowaniem techniki DDS.The paper deals with a problem, how to decrease the measurement uncertainty and shorten the time response of the eddy current test system with a transform transducer. This transducer output signal is complex. Its amplitude and phase or real and imaginary part contain information about the measurand. An IC AD5933 from Analog Devices and two analog to digital converters were used for digital measurements of the eddy current transducer output impedance. The current in the eddy current transducer excitation coil should be sinusoidal. A sinusoidal source is realized through a Direct Digital Synthesis (DDS). AD5933 output registers deliver digital signals to DAC inputs for synthesis of the sin and cos function. The eddy current transducer output signal is processed by Hanning window and Discrete Fourier Transform (DFT). The ATmega micro-controller with the application program controls the mode and operation of the AD 5933 with the eddy current transducer and performs acquisition of the complex measurement signal to its flash memory via I2C interface. Then the RS 232C link to a PC provides transfer of the measurand data for further processing and visual-isation