161 research outputs found
The Crystal Structure of Cadmium Nitrate Tetrahydrate
The structure of cadmium nitrate t etrahydrate has been
determined from two-dimensional X-ray data. The crystals are
rhombic, space group Fdd2-c~; , with a = 5.83, b = 25.75,
c = 10.99 A, Z = 8. They are piezoelectric. It follows from the
interatomic distances that the compound is tetra-aquocadmium
nitrate defined by the formula [Cd(OH2 ) 4](N03)2. The lengths of
the cadmium-water distances (2 .35 and 2.37A) are almost the
same as the cadmium-oxygen distances in the CdO (2.35 A), and
smaller than cadmium-oxygen from the nitrate group
Fuzzy practical exponential tracking of an electrohydraulic servosystem
Cilj ovog rada je da doprinese teorijskoj i praktiÄnoj primeni fazi logiÄkog upravljanja koriÅ”Äenjem koncepta praktiÄnog praÄenja. Predlaže se novi fazi upravljaÄki algoritam za ostvarivanje željenog kvaliteta praÄenja jednog elektrohidrauliÄkog pozicionog servosistema, koji se može naÄi u mnogim industrijskim ureÄajima. Fazi logiÄki kontroler je jedan od najjednostavnijih. On koristi samo jednu ulaznu veliÄinu, sa linearnom metodom zakljuÄivanja. Fazi prateÄi algoritam upravljanja je zasnovan na principu samoprilagodljivosti. Strukturna karakteristika takvog sistema upravljanja je postojanje dve povratne sprege: globalne, negativne po izlaznoj veliÄini i lokalne, pozitivne po upravljaÄkoj veliÄini. Takva struktura obezbeÄuje sintezu upravljanja bez poznavanja unutraÅ”nje dinamike objekta i bez merenja poremeÄajnih veliÄina. Predloženi fazi prateÄi algoritam upravljanja obezbeÄuje promenu greÅ”ke izlazne veliÄine po unapred definisanom eksponencijalnom zakonu. Prezentuju se rezultati simulacije nelinearnog matematiÄkog modela hidrauliÄkog servosistema.The aim of this paper is to contribute to the theoretical and practical applications of fuzzy logic control using practical tracking concept. A new fuzzy control algorithm is proposed to achieve the desired tracking performance of a nonlinear electrohydraulic position servo system, which can be found in many manufacturing devices. The fuzzy logic controller is one of the simplest. It employs only one input, with linear fuzzy inference method. The practical tracking control algorithm is based on the selfadjustment principle. The structural characteristic of such a control system is the existence of two feedback sources: the global negative of the output value and the local positive of the control value. Such a structure ensures the synthesis of the control without the internal dynamics knowledge and without measurements of disturbance values. The proposed fuzzy practical control algorithm ensures the change of the output error value according to a prespecified exponential law. The simulation results of the nonlinear mathematical model of the hydraulic servo system are presented
Fuzzy practical exponential tracking of an electrohydraulic servosystem
Cilj ovog rada je da doprinese teorijskoj i praktiÄnoj primeni fazi logiÄkog upravljanja koriÅ”Äenjem koncepta praktiÄnog praÄenja. Predlaže se novi fazi upravljaÄki algoritam za ostvarivanje željenog kvaliteta praÄenja jednog elektrohidrauliÄkog pozicionog servosistema, koji se može naÄi u mnogim industrijskim ureÄajima. Fazi logiÄki kontroler je jedan od najjednostavnijih. On koristi samo jednu ulaznu veliÄinu, sa linearnom metodom zakljuÄivanja. Fazi prateÄi algoritam upravljanja je zasnovan na principu samoprilagodljivosti. Strukturna karakteristika takvog sistema upravljanja je postojanje dve povratne sprege: globalne, negativne po izlaznoj veliÄini i lokalne, pozitivne po upravljaÄkoj veliÄini. Takva struktura obezbeÄuje sintezu upravljanja bez poznavanja unutraÅ”nje dinamike objekta i bez merenja poremeÄajnih veliÄina. Predloženi fazi prateÄi algoritam upravljanja obezbeÄuje promenu greÅ”ke izlazne veliÄine po unapred definisanom eksponencijalnom zakonu. Prezentuju se rezultati simulacije nelinearnog matematiÄkog modela hidrauliÄkog servosistema.The aim of this paper is to contribute to the theoretical and practical applications of fuzzy logic control using practical tracking concept. A new fuzzy control algorithm is proposed to achieve the desired tracking performance of a nonlinear electrohydraulic position servo system, which can be found in many manufacturing devices. The fuzzy logic controller is one of the simplest. It employs only one input, with linear fuzzy inference method. The practical tracking control algorithm is based on the selfadjustment principle. The structural characteristic of such a control system is the existence of two feedback sources: the global negative of the output value and the local positive of the control value. Such a structure ensures the synthesis of the control without the internal dynamics knowledge and without measurements of disturbance values. The proposed fuzzy practical control algorithm ensures the change of the output error value according to a prespecified exponential law. The simulation results of the nonlinear mathematical model of the hydraulic servo system are presented
The Crystal Structure of Cadmium Nitrate Tetrahydrate
The structure of cadmium nitrate t etrahydrate has been
determined from two-dimensional X-ray data. The crystals are
rhombic, space group Fdd2-c~; , with a = 5.83, b = 25.75,
c = 10.99 A, Z = 8. They are piezoelectric. It follows from the
interatomic distances that the compound is tetra-aquocadmium
nitrate defined by the formula [Cd(OH2 ) 4](N03)2. The lengths of
the cadmium-water distances (2 .35 and 2.37A) are almost the
same as the cadmium-oxygen distances in the CdO (2.35 A), and
smaller than cadmium-oxygen from the nitrate group
Neural nets versus logistic regression: A comparison of each model\u27s ability to predict commercial bank failures
https://egrove.olemiss.edu/dl_proceedings/1081/thumbnail.jp
Structural Studies of Strontium Nitrate Tetrahydrate and Monohydrated Mercuric Oxynitrate
Single crystals of strontium nitrate tetrahydrate, Sr(N03h Ā· 4H20, were
.obtamed by slow evaporation of a saturated aqueous solution. Once grown and separated from the mother liquor, the crystals become very unstable in air. They lose water to form Sr(N03h. To p11otect them, the crystals were transferred to thin-walle d Lindemann glass capillary tubes together with the mother liquor which was on their surfaces. The tubes were then sealed
Optical Biopsy Method for Breast Cancer Diagnosis Based on Artificial Neural Network Classification of Fluorescence Landscape Data
Supervised self-organizing map, a type of artificial neural network, is applied for classification of human breast tissue samples utilizing data obtained from fluorescence landscape measurements. Female breast tissue samples were taken soon after the surgical resection, identified and stored at -80 degrees C until fluorescence measurements. From fluorescence landscapes obtained in UV-VIS region spectral features showing statistically significant differences between malignant and normal samples are identified and further quantified to serve as a training input to neural network. Additional set of samples was used as a test group input to trained network in order to evaluate performance of proposed optical biopsy method. Classification sensitivity of 83.9% and specificity of 88.9% are found
Comparative determination of lead concentrations in the air of the working environment by x-ray fluorescence spectroscopy and the spectrophotometric method
Za odreÄivanje koncentracije olova u vazduhu u autoservisnoj radionici -Autovojvodina- u Novom Sadu primijenjene su metode rendgenske fluorescentne spektroskopije i spektrofotometrije. Rendgenski fluorescentni spektrometar baždaren je apliciranjem poznatih koncentracija Pb(N03)i na filter-papir. Vazduh je uzorkovan filtracijom poznatog volumena kroz filter-papir. NaÄena koncentracija olova u vazduhu bila je ispod maksimalne dozvoljene koncentracije. U radu su izneseni i rezultati dobiveni spektrofotometrijskom metodom te su naÄene razlike od 10 do 30% u odnosu na rezultate dobivene rendgenskom fluorescentnom spektroskopijom.The x-ray fluorescence spectroscopy and the spectrophotometric method were used to determine lead concentrations in the air of an auto repair shop. The calibration of the x-ray spectrometer was performed with known concentrations of water solutions of Pb(N03), on filter paper. Samples were prepared by filtration of measured volumes of air. The lead amounts determined were below the maximum permissible concentrations. The results obtained with the spectrophotometric method are also given showing discrepancies between 10 and 30 per cent if compared with the results of x-ray fluorescence spectroscopy
Optical Biopsy Method for Breast Cancer Diagnosis Based on Artificial Neural Network Classification of Fluorescence Landscape Data
Supervised self-organizing map, a type of artificial neural network, is applied for classification of human breast tissue samples utilizing data obtained from fluorescence landscape measurements. Female breast tissue samples were taken soon after the surgical resection, identified and stored at -80 degrees C until fluorescence measurements. From fluorescence landscapes obtained in UV-VIS region spectral features showing statistically significant differences between malignant and normal samples are identified and further quantified to serve as a training input to neural network. Additional set of samples was used as a test group input to trained network in order to evaluate performance of proposed optical biopsy method. Classification sensitivity of 83.9% and specificity of 88.9% are found.International School and Conference on Photonics (PHOTONICA09), Aug 24-28, 2009, Belgrade, Serbi
The joy of ruling: an experimental investigation on collective giving
We analyse team dictator games with different voting mechanisms in the laboratory. Individuals vote to select a donation for all group members. Standard Bayesian analysis makes the same prediction for all three mechanisms: participants should cast the same vote regardless of the voting mechanism used to determine the common donation level. Our experimental results show that subjects fail to choose the same vote. We show that their behaviour is consistent with a joy of ruling: individuals get an extra utility when they determine the voting outcome
- ā¦