On the Lichnerowicz conjecture for CR manifolds with mixed signature

We construct examples of nondegenerate CR manifolds with Levi form of signature $(p,q)$, $2\leq p\leq q$, which are compact, not locally CR flat, and admit essential CR vector fields. We also construct an example of a noncompact nondegenerate CR manifold with signature $(1,n-1)$ which is not locally CR flat and admits an essential CR vector fields. These provide counterexamples to the analogue of the Lichnerowicz conjecture for CR manifolds with mixed signature.Comment: 7 page

EXPERIENTIAL METHODS OF STUDYING THEORY AT ENGINEERING UNIVERSITIES

Introduction. Nowadays, the crisis of engineering education is observed around the world. This crisis is caused by prompt rates of development of science, high technologies and equipment, globalization processes, transition of economies of the developed countries to the innovative way of development and it requires the search for corresponding demands from the society and labour market for effective forms and methods of student education in technical specialties. The aims of the present publication are the following: to identify features of productive tutorials for future engineers; to describe experiential method of studying of the theory or otherwise the theoretical-focused method. Methodology and research methods. The methodological framework of the research is based on: practice-centred, person-centred and systemic approaches to education; theories of active and interactive training; methods of generalization and analysis. Results and scientific novelty. In recent years, the sphere of engineering education and generally the higher school have undergone a number of essential changes. It is shown that the ratio in a traditional dyad “theory – practice” has exchanged; its logic is still declared as basic, but in the reality is not any more. The role and value of lectures as source of educational information are defined. The conclusion is drawn that modern students neither from the psychological point of view, nor in connection with badly developed basic skills and abilities are still not ready to active and rational independent training; according students, they prefer less expensive and more effective lecture-based training provided by full-time attendance. It is noted that the declared principle of the practice-oriented training, which is not supported with theoretical base, does not allow the average university graduate to gain today’s in-demand competencies such as mobility, flexibility and adaptability, readiness for change of the place and activity profile, self-learning ability, and ability to plan and predict the prospects of career development, etc.Based on the experience of teachers of engineering higher education institution and own pedagogical activity, the author approves phasing out of the traditional principles of the organization and implementation of educational process caused by discrepancy of its classical model to challenges of modern times. The author proves implementation of a new, experiential method in the higher engineering education, which is directed to development of the theory and its practical consolidation of knowledge. The options for realization of the method are considered; its benefits and drawbacks are presented. This method has the integrated character; the method updates all the types of student educational activity (thinking, actions, speech, emotional and personal perception of a professional context), thus contributing to more effective interiorization of educational information and its conscious development; adhere to the recommendations of the international engineering communities to preparation of technical personnel and requirements of state standards of the higher education.Practical significance. The research materials and proposed approaches to training of engineering staff presented in the publication can be used by teachers of higher education institutions in daily practice for student cognitive activity stimulation and enhancing its efficiency.Введение. Наблюдающийся во всем мире кризис инженерного образования, обусловленный стремительными темпами развития науки, высоких технологий и техники, процессами глобализации, переходом экономик развитых стран на инновационный путь развития, требует поиска соответствующих запросам общества и рынка труда эффективных форм и методов обучения студентов технических направлений подготовки. Цели представленной в статье работы заключаются в выявлении особенностей продуктивных средств обучения будущих инженеров и характеристике одного из них – экспириентивного метода изучения теории, или иначе теоретико-ориентированного метода. Методология и методы. Методологическую базу исследования составили практико-ориентированный, личностно-ориентированный и системный подходы к образованию; теории активного и интерактивного обучения; методы обобщения и анализа. Результаты. Зафиксирован ряд существенных изменений, которые произошли в последние годы в сфере инженерной подготовки и в целом в высшей школе. Показано, что поменялось соотношение в традиционной диаде «теория – практика», логика которой по-прежнему декларируется как базовая, но в реальности таковой уже не является. Определены роль и значение лекций как источника учебной информации. Сделан вывод о том, что современные студенты пока ни с психологической точки зрения, ни в связи с плохо сформированными базовыми навыками и умениями не готовы к деятельному и рациональному самостоятельному обучению и предпочитают менее затратные и более действенные, по их мнению, лекционные формы занятий в очном режиме. Констатируется, что декларируемый принцип практико-ориентированного обучения, не подкрепленный теоретической базой, не позволяет среднестатистическому выпускнику вуза приобрести такие востребованные сегодня компетенции, как мобильность, гибкость и адаптивность, готовность к смене места и профиля деятельности, самообучаемость, умение планировать и прогнозировать перспективы карьерного роста и др. С опорой на опыт преподавателей инженерного вуза и собственную педагогическую деятельность автор утверждает постепенный отказ от традиционных принципов организации и осуществления учебного процесса, вызванный несоответствием его классической модели вызовам нового времени. Обосновывается внедрение в высшее инженерное образование нового, экспириентивного метода, направленного на освоение теории и ее практическое закрепление. Рассмотрены варианты реализации метода, отмечены его недостатки и достоинства. Метод носит интегрированный характер; актуализирует все виды образовательной активности студентов (мышление, действия, речь, эмоционально-личностное восприятие профессионального контекста), что способствует более эффективной интериоризации учебной информации и ее осознанному освоению; соответствует рекомендациям международных инженерных сообществ к подготовке технических кадров и требованиям государственных стандартов высшего образования. Практическая значимость. Представленные в публикации материалы и предлагаемые подходы к подготовке инженерных кадров могут быть использованы преподавателями вузов в повседневной практике в целях стимулирования познавательной деятельности студентов и повышения ее результативности

On Rank Problems for Planar Webs and Projective Structures

We present old and recent results on rank problems and linearizability of geodesic planar webs.Comment: 31 pages; LaTeX; corrected the abstract and Introduction; added reference

THE ETIOLOGICAL SPECTRUM AND ANTIBIOTIC RESISTANCE PATTERN OF BACTERIA CAUSING UNCOMPLICATED URINARY TRACT INFECTIONS: A TEN-YEAR SURVEILLANCE STUDY (2005-2015)

Background and objective. Knowledge of local antimicrobial resistance pattern is very important for evidence-based empirical antibiotic prescribing. The main objective of the present study was to evaluate the prevalence and the antimicrobial resistance pattern of the main bacteria responsible for uncomplicated urinary tract infection (UTI) in Kyiv region (Ukraine), throughout a ten year period, in order to establish an appropriate empirical therapy. Materials and methods. A retrospective analysis of the etiological spectrum and antimicrobial resistance of uropathogens in urine samples isolated over the 10-year period, 2005 to 2015, in a single center was performed. Results. In total 380positive urine samples processed at our laboratory of which 193/380 (51 %) had E. coli as the infecting organism. Although E. coli was, as usual, the most common pathogen implicated in UTI, it were observed increasing the share of Enterococcus spp. - 82/380 (21.6%). Ampicillin and trimethoprim were the least-active agents against E. coli with resistance rates of 75% and 70%, respectively. Significant trends of increasing resistance over the 10-year period were identified for trimethoprim, fluoroquinolones ІІ and III generations, penicillins, and carbapenems. Nitrofuran derivative remains a reasonable empirical antibiotic choice in this community with a 10-year resistance rate of 8.3 %. Was determined that recurrent UTI is an independent risk factor for bacterial multidrug-resistance. Conclusions. Over the last 10 years, the proportions of fluoroquinolones resistant E. coli and multidrug-resistant bacteria have significantly increased. The fluoroquinolones shall not be used in the empirical treatment of uncomplicated UTI in Kyiv region patients. For the empirical treatment of uncomplicated UTI in women should be used nitrofuran derivative (furazydyn K). If required of parenteral administration of antibiotics should be used cephalosporins IVgeneration. This data will enable evidence-based empirical prescribing which will ensure more effective treatment and lessen the emergence of resistant uropathogens in the community

Modern approaches for extraterrestrial matter collection

Представлены результаты работы, направленной на повышение эффективности поиска внеземного вещества с использованием методов наблюдательной астрономии. Описываются методика проведения наблюдений, принципы построения болидной сети и особенности ее организации. Обсуждаются вопросы сбора вещества в холодных и горячих пустынях.We present results of the activity aimed at increase in search efficiency of extraterrestrial matter collection, using methods of observational astronomy. Approaches for observations and technical features of appropriate fireball network structure are described. Results of traditional meteorite collection in cold and hot deserts with accumulation mechanisms are compared to modern methods.Работа выполнена в рамках государственного задания ФАНО России (тема «Деформация», №01201463327), проекта УрО РАН №15-17-2-11 при финансовой поддержке Министерства образования и науки Российской Федерации (базовое финансирование по проекту № 5162) и Правительства Российской Федерации (постановление №211, контракт №02.А03.21.0006)

SPECTRUM OF MICROFLORA IN URINE OF PATIENTS WITH CHRONIC RECURRENT PYELONEPHRITIS (THE TEN YEARS FOLLOWING-UP)

The aim of this work was to compare the specific spectrum of bacterial pathogens which stipulate chronic recurrent pyelonephritis during the longitudinal following-up. Materials and methods. There were performed the complex microbiologic investigations of urine, scrapes from cervical canal and vaginal smears from 386 women with chronic pyelonephritis. Results. The analysis of the spectrum of microflora separated out of the patients’ urine during 10 years showed the considerable growth of the specific weight of Enterococcus spp. (up to 18,6 %). In the process of chronic pyelonephritis recurrence in 64,3 % patients showed the changes in the specific spectrum ofpathogens with the prevalence of E.faecalis and S.epidermidis (14,3 % each). At the same time, there was stated the presence of opportunistic microflora in vaginal smears (40,1 %) and scrapes from cervical canal (30,8 %) of the examined women. The mechanism of bacteria persistence in urogenital tracts in women with chronic recurrent pyelonephritis was also under study. Conclusion. There has been confirmed the importance of the comprehensive study of the spectrum and specificity of pathogens which can stipulate the aggravation of chronic pyelonephritis and mechanisms of its course.

Economic Features of Landscaping Plants of Plants of the Genus Cornus

The article deals with the use of Cornus plant species, their ecological, ecological, biological and decorative features. The cost of landscaping and covering the projected area has been calculated.В статье рассмотрена тема о применении растений рода Дерен, их экономические, экологические, биологические и декоративные особенности. Рассчитана стоимость озеленения и покрытий проектируемого участка

INVESTIGATION OF THE EFFECT OF THE INTERVAL BETWEEN BAROUTREATMENT AND SOWING OF SEEDS ON THEIR SOWING QUALITIES

The dependence of the number of germinated lettuce seeds treated with a pressure of 5 MPa and 20 MPa on the time interval between processing and planting of these seeds has been determined. Pressure treatment increases the percentage of germination of seeds regardless of the specified time interval.Исследование выполнено за счет гранта Российского научного фонда № 22-26-00346, https://rscf:ru/project/22-26-00346/

TREATMENT OF DILL SEEDS BY HYDROSTATIC PRESSURE AND THE EFFECT OF THIS FACTOR ON SEED GERMINATION AND FURTHER DEVELOPMENT OF SPROUTS

The purpose of this work was to study the effect of hydrostatic pressure treatment of dill seeds on their laboratory germination and further development of sprouts. It was necessary to confirm the hypothesis about the positive effect of pressure on the germination and growth rate of dill seeds.Исследование выполнено за счет гранта Российского научного фонда № 22-26-00346, https://rscf.ru/project/22-26-00346/

FEATURES OF THE MICROBIAL SPECTRUM UROGENITAL SYSTEM OF WOMEN WITH RECURRENT PYELONEPHRITIS

The aim of our research was to identify the peculiarities of the microbial spectrum urogenital system of the women with recurrent pyelonephritis. Materials and methods. We have conducted a comprehensive micro-biological examination different biological material (urine, vaginal swabs, scraping of urethral and cervical canal’s) of 175 women with recurrent pyelonephritis. The patients were divided in accordance with frequency of recurrent. The microbial spectrum urogenital system of 98 women with recurrent pyelonephritis (group 1) was compared with 77 women with sporadic pyelonephritis (up to 2 times per year) (group 2). The research included the process of identification of bacterial agents, mollicutes, chlamydia as well as yeasts. Results. In the women with recurrent pyelonephritis had the significant increase of frequency of identification of E. faecalis in urine (p=0.03), in urethral canal (p=0.05), and vaginal scraping (p=0.02). 48 women from 1st group had bacterial mix-infection. At the same time, the women from comparative group had only in 25 (32.6%) cases (p=0.027). The direct associative relationship was found between existence of S. epidermidis in urethral canal, in cervical canal, in vagina and the frequency of recurrent pyelonephritis (ρ=0.2, р=0.009; ρ=0.23, р=0.004 and ρ=0.19, р=0.01 respectively); E. faecalis in the urethral canal (ρ=0.19, р=0.02); Candida albicans in the vagina (ρ=0.17, р=0.03). 79.6% examined patients were infected by mollicutes, viruses and chlamydia. Conclusions. Consistent high level of urethral’s and vaginal’s bacterial weight of the women with recurrent pyelonephritis leads to the migration of causative agents into bladder and to activates formation of recurrent of the disease. Identified peculiarities of microbial spectrum prove the necessity mandatory micro-biological research not only urine, but urethra, cervical canal, and vagina