Text classification using convolutional neural network committee training

The method of classification of textual information based on the apparatus of convolutional neural networks is considered. The word-by-word text conversion into dense vectors is considered. Testing was conducted on the text data of the sample “The 20 Newsgroups”, this sample contains texts distributed in 20 classes. The accuracy, the best of the convolutional neural network used in this work, on the test sample was ~ 74%. The accuracy of voting of neural networks using the Bagging algorithm was ~ 81.5%. Based on the review of similar solutions, a comparison was made with the following text classification algorithms: using the support vector machine (SVM, 82.84%), naive bayes classifier (81%), k nearest neighbor algorithm (75.93%), a bag of words

Charge screening and magnetic anisotropy in metallic rare-earth systems

The calculation of magnetic anisotropy constants is performed beyond the point charge model for a continuous charge density distribution of screening conduction electrons. An important role of the non-uniform electron density, in particular, of the Friedel oscillations, in the formation of crystal field is demonstrated. Such effects can modify strongly the effective ion (impurity) charge and even change its sign. This enables one to justify the anion model, which is often used at discussing experimental data on hydrogen-containing systems. Possible applications to the pure rare-earth metals and RCo5 compounds are discussed. The deformation of magnetic structure near the interstitial positive muon owing to the strong local anisotropy, and the corresponding contribution to the dipole field at the muon are considered.Comment: 10 pages, RevTeX, 3 figure

The effect of hydrothermal coefficient on productivity of maize hybrids of various groups of ripeness

The improvement of the breeding programs, selection of the optimal group of ripeness depends on the soil and climatic conditions for which varieties and hybrids are developed. One of the most important indicators of climatic conditions is the hydrothermal coefficient (HTC). The purpose of the current study was to analyze the effect of HTC on the productivity of maize hybrids of various groups of ripeness. The studies were carried out in 2014–2019 at the Agricultural Research Center “Donskoy” located in the southern zone of the Rostov Region, characterized by unstable moisture. The objects of the study were 96 interlinear maize hybrids of three groups of ripeness, namely an early ripening group (FAO 150), a middle-early ripening group (FAO 200) and a middle ripening group (FAO 300). There was a systematic use of variants in the trials. The weather conditions of the years 2014 and 2018 could be estimated as arid (HTC = 0.32–0.57). The years 2015, 2016, 2017 and 2019 were of medium aridity (HTC = 0.58–0.89). The HTC determined only for the entire vegetation period did not allow estimating objectively the growing conditions. There has been required a more detailed analysis of the HTC for the periods (months) of vegetation. On average, over the years of study, the middle ripening maize hybrids were characterized with the largest grain productivity (3.98 t/ha). The early ripening maize hybrids were characterized with the smallest productivity (3.31 t/ha). The middle-early ripening hybrids were characterized with the average value (3.80 t/ha). However, in different years, the maximum grain yields were produced by the hybrids of various groups of ripeness, including by the early ripening varieties, that depended on the amount of HTC in different vegetation periods. There have been identified average positive correlation coefficients between the HTC values and maize hybrids’ productivity (r = 0.64–0.74). The use of maize hybrids of various groups of ripeness can stabilize the gross harvest of maize

The results and prospects of maize breeding in the Agricultural Research Center “Donskoy”

The current paper has presented the results of breeding work on maize in the Agricultural Research Center “Donskoy”. The three-line and double interlinear middle early and middle ripening maize hybrids of various economic use ‘Zernogradsky 242 MV’, ‘Zernogradsky 282 MV’, ‘Zernogradsky 288 MV’, ‘Zernogradsky 299 MV’, ‘Zernogradsky 354 MV’, ‘Zernogradsky MV’, ‘Stepnyak MV’ were developed and included into the State List of Breeding Achievements from 2006 to 2020. The Competitive Variety Testing has identified a new high-heterosis simple hybrid ‘Zernogradsky 352 MB’ and the new early ripening hybrids ‘Krucha M × KB 215’, ‘Krucha M × SP 56/57’ with low harvesting grain moisture. The main method used to develop maize hybrids was an interline hybridization using heterosis in the first generation (F1 ). There have been determined the priority directions of further breeding, namely early ripeness, grain humidity-transfer intensity during ripening, drought resistance, high starch content in grain. There has been developed new initial material for each direction of breeding. There have been selected the introduced testers (‘Alpha M’, ‘Almaz M’, ‘Aurora S’, ‘Milena M’, ‘Istok S’) to develop early-ripening hybrids. There have been identified the early and middle-early ripening self-pollinated lines ‘C 207’, ‘RD 12’, ‘TVA 308’, ‘PLS 61’, ‘KB 215’, etc., with a high grain humidity-transfer intensity during ripening (0.95–1.30% per day), low harvest moisture content of grain (10.8–13.8%). There have been developed the new self-pollinated waxy maize lines (24/29/5, 25/64/10, 26/8, 26/4, 26/80, 24/28) with 68.1–69.8% of amylopectin starch in grain. There have been identified the new self-pollinated maize lines resistant to water stress (DS 498/217-3, DS 257/85-5, DS 498/203, KB 262, etc.) promising for breeding drought-resistant maize hybrids

MIDDLE MATURING MAIZE HYBRIDS ‘ZERNOGRADSKY 354 MV’ AND ‘GEFEST MV’

A long use of the hybrid in production often results in the loss of immunity to the diseases. Climate change and growing needs of the farmers also demand a consistent improvement of maize hybrids. Therefore a constant renewal of the range of domestic maize hybrids is a necessity of successful competition with foreign hybrids. The middle maturing maize hybrid ‘Zernogradsky 354 MV’ was hybridized by I.G. Kalinenko All-Russian RI of Grain crops (ARRIGC) together with All-Russian RI of maize (ARRIM) and the new hybrid ‘Gefest MV’ was received in ARRIGC. According to the time of their vegetation, they are the principle hybrids for the south of the Rostov region. These hybrids are adapted to soil-climatic conditions of the Rostov region; they are universal for economic use (for grain and for silage). In dry years the average grain productivity of the hybrid ‘Zernogradsky 354 MV’ was 3,85 t/ha and it of the hybrid ‘Gefest MV’ was 4,52 t/ha. The potential productivity of the hybrids was 10,0-11,0 t/ha, the average productivity of the green mass was 29,3-30,6 t/ha in dry years. The hybrids are tolerant to droughts and main maize diseases, typical for the region. The hybrid ‘Gefest MV’ showed a high resistance to lodging with prolonged standing with a root. The hybrid ‘Zernogradsky 354 MV’ is characterized with a high content of starch in grain (71,4%), therefore the grain is a valuable raw for starch-syrup industry. The hybrid seed-growing is conducted on a sterile cytoplasm of Moldavian type of CMS with a full restoration of fertility. The average yield of the seeds is 2,0 t/ha on the plots of hybridization

THE MIDDLE-EARLY HYBRID OF MAIZE 'ZERNOGRADSKY 288 MV' OF A MULTI-PURPOSE USE

The breeding work on obtaining new varieties and hybrids of crops is being carried out constantly that allows developing genotypes for various soil-climatic conditions with the improved indexes of the main economic-valuable traits. A new middle-early hybrid of maize 'Zernogradsky 288 MV' has been obtained by All-Russian Research Institute of Grain Crops named after I.G. Kalinenko. According to the results of the State Variety Testing it has been introduced into the State List of Agricultural Achievements of RF and it has been approved to use in the Central-Black earth region since 2016. The hybrid of maize 'Zernogradsky 288 MV' is a three-line, middle-early (FAO 250), multi-purpose (for grain and green forage) cultivar, which belongs to the varieties with dent yellow grain, of (Zea mays L. indentata). According to the results of the competitive trial in the arid years of 2010-2012 the grain productivity was 3.40 t/ha, the green chop productivity was 25.0 t/ha. The advantage of the hybrid among the others was its high resistance to drought, high stability to lodging (only 1.3% of lodged plants) and low harvesting humidity of grain (12.2%). The new hybrid is largely tolerant to blister smut and stem rot, middle-tolerant to stem borer. The hybrid seed-growing is carried out on a sterile cytoplasm of Moldovan type CMS, the yield of seeds from all plots of hybridization is 2.0 t/ha. The new middle-early hybrid of maize 'Zernogradsky 288 MV' surpassed the standard varieties on the plots of the Central Black earth region in grain and green chop productivity. The maximum productivity of grain (10.89 t/ha) was received on the Oboyansk plot of theKurskregion, that was on 1.04 t/ha (10.6%) larger than 'Voronezhsky 279 SV'. The maximum productivity of green chop (32.69 t/ha) was obtained on theLipetskplot of theLipetskregion, that was on 9.46 t/ha (40.7%) larger than the standard variety 'Amamonte'. The introduction of the maize hybrid 'Zernogradsky 288 MV' in the agriculture of the Central Black earth region will allow increasing the gross yield of grain and green chop

MAIN TRENDS OF MAIZE BREEDING IN ARRIGC NAMED AFTER I.G. KALINENKO

The main trends of the breeding of new corn hybrids in ARRIGC are the breeding of the hybrids with tolerance to drought, high water yielding capacity of the grain during ripening, high contents of starch in grain, breeding for ensilage and green forage. For each trend of the breeding process there was developed and introduced such new initial material as self-pollinated lines and populations. The new drought tolerant lines ‘КV 498’, ‘КS 311’, ‘Zp 498А’, ‘DK 655’ and others have been created possessing little residual water deficit (7.9 – 9.2 %) during flowering and its slight increase (up to 9.3 – 10.1 %) in the phase of milky-wax ripeness when the drought becomes stronger. They have been included into the program of hybridization on the breeding of drought tolerant corn hybrids. The new self-pollinated lines ‘ZS 226’, ‘ZS 123’, ‘ZS 121’, ‘КV 263’, ‘ZS 244’ with intensive drying of grain (more than 1% per day) while maturing have been developed for the breeding of the corn hybrids with a low harvesting moisture content of grain. The initial material ‘Assiniboine’, ‘Pima indians’, ‘Dalnevostochnaya mestnaya’, ‘Kanadskaya mestnaya’, etc. with 69.0 – 72.8 % starch in grain was introduced for the breeding of corn hybrids of the kind of Zea mays amylaceae with a high contents of starch in grain. The self-pollinated generations I2 of the subspecies Zea mays ceratina ‘57/1’, ‘55/1’, ‘197/1’, ‘170/1’, ‘188/1’, ‘20/5’ with 69.2 – 70.3 % of amylopectin starch in grain have been developed. The tall, well-leafy self-pollinated lines ‘КV 399’, ‘КV 469’, ‘КV 272’ have been chosen for the breeding on ensilage and green forage. Due to the use of the new initial material there have been selected drought tolerant corn hybrids. They are ‘Zernogradsky 282 MV’, ‘Zernogradsky 288 MV’, ‘Zernogradsky 354 MV’ with a high contents of starch, rapidly drying ‘Zernogradsky 242 MV’ and ‘Zernogradsky 404 AMV’ for silage