Calculation of the close packing of fine aggregate on the basis of screening for fine grained concrete

The paper considers the calculation of the maximum packing density of fine aggregate. The selection of the granulometric composition of the aggregate is given. The bulk densities and packing densities of standard screening fractions were determined. The content of each fraction in the mixture and the packing density of the aggregate mixture are calculated by the introduction of a subsequent finer fraction. Topological calculation of sandstone screening was performed. The results of sieving of sandstone screening are presented. The high-density grain composition of aggregate for fine-grained concrete is obtained. The compositions of concrete mixtures have been designed. The volume ratio of aggregate and cement paste in the concrete mix, the average mass size of the aggregate grains in the mixture, the volume fractions of cement and water in the concrete mixture are determined. The physicomechanical characteristics of fine-grained concrete of various compositions with a high density aggregate are shown. Results of testing the control samples for compressive strength are given. The density of the obtained samples was determined. Conclusions are drawn on the work.Keywords: Fine-grained concrete, fine aggregate, granulometry, screenings, sandstone, highdensity aggregat

NATIONAL VECTORS OF THE IMPLEMENTATION OF AGRICULTURAL LAND PLOTS MARKET IN UKRAINE

The issue of the existing agricultural land improvement effectiveness in the course of land reform is scrutinized in the article. The research relevance is predefined by the need for the fragmented land ownerships and tenures optimization as a constituent of the sustainable land tenure in Ukraine. Land plots exchange approaches substantiation in the course of the existing agricultural land tenure improvement under current social and economic conditions is the goal of the research. Key aspects of land exchange aiming at land tenure optimization within the agricultural land mass in accordance to the legislation in effect have been exemplified. Sources of the existing agricultural land tenures and land ownerships drawbacks have been singled out. Land tenure areas of agricultural enterprises situated in Ukraine and Kyiv Region have been analyzed. Land plots exchange based on a set of qualitative, spatial and technological characteristics has been carried out on the example of an agricultural enterprise in Kyiv Region. As the result, the improvement of the agricultural enterprise land tenure spatial characteristics including furrow length has been achieved. The research results can be used at the existing land tenure and land ownership improvement in accordance to the legislation, the land consolidation strategy development in Ukraine, land owners and land users private efforts and the scientific researches in the future

Dopamine receptor type 1 of Caenorhabditis elegans expressing in mechanosensory neurons

Until now the results on profiling dopamine receptors in C. elegans have been incomplete and fragmentary. The aim of this study was to investigate the expression profile of dop-1 gene in C. elegans using 3 kb promoter with 3'-end locating before ATG of dop-1 gene. Methods. The strain of C. elegans with mutant unc-119 gene was used. To check a pattern of the dop-1 expression, the promoter of this gene was amplified using PCR. The animals were co-bombarded with plasmid pPD95.77 dop-1::GFP and reporter construct containing unc-119 gene. Results. Using GFP as a reporter protein, we built a whole picture of expression of dopamine receptor type 1 in C. elegans and found that this protein could be detected only in mechanosensory neurons such as PLM, PVQR, PVQL, ALNR, ALNL, DVAR, DVC. Keywords: dopamine receptors, mechanosensory neurons, Caenorhabditis elegans, expressionРезультати досліджень експресії дофамінових рецепторів в C. elegans наразі залишаються неповними і фрагментарними. Мета роботи полягала у вивченні профілю експресії дофамінового рецептора типу 1 (dop-1) в C. elegans з використанням промотору розміром 3 тис. п. н., 3'-кінцева послідовність якого розташована перед кодоном ATG гена dop-1. Методи. Культивування штаму C. elegans, мутантного за геном unc-119, з агаром NGM. Для перевірки паттерну експресії dop-1 ампліфіковано промотор гена методом ПЛР. Клітини тварин кобомбардували плазмідою pPD95.77dop-1::GFP та репортерною конструкцією з геном unc-119. Результати. Із застосуванням GFP як репортерного білка вдалося повністю охарактеризувати профіль експресії дофамінового рецептора першого типу в C. elegans. Висновки. Продемонстровано, що даний білок експресується в механосенсорних нейронах, таких як PLM, PVQR, PVQL, ALNR, ALNL, DVAR і DVC. Ключові слова: дофамінові рецептори, механосенсорні нейрони, Caenorhabditis elegans, експресіяДо настоящего времени результаты исследований экспрессии дофаминовых рецепторов в C. elegans остаются неполными и фрагментарными. Цель работы состояла в изучении профиля экспресии дофаминового рецептора первого типа (dop-1) в C. elegans с использованием промотора размером 3 тыс. п. н., 3'-концевая последовательность которого расположена перед кодоном ATG гена dop-1. Методи. Культивирование штамма C. elegans, мутантного по гену unc-119, с агаром NGM. Для проверки паттерна экспрессии dop-1 амплифицировали промотор гена методом ПЛР. Клетки животных кобомбардировали плазмидой pPD95.77dop-1::GFP и репортерной конструкцией с геном unc-119. Результаты. С использованием GFP в качесве репортерного белка удалось полностью охарактеризовать профиль экспрессии дофаминового рецептора первого типа в C. elegans. Выводы. Продемонстрировано, что данный белок детектируется в механосенсорных нейронах, таких как PLM, PVQR, PVQL, ALNR, ALNL, DVAR и DVC. Ключевые слова: дофаминовые рецепторы, механосенсорные нейроны, Caenorhabditis elegans, экспресси

Observation of Geo-Neutrinos

Geo-neutrinos, electron anti-neutrinos produced in beta decays of naturally occurring radioactive isotopes in the Earth, are a unique direct probe of our planet's interior. We report the first observation at more than 3$\sigma$ C.L. of geo-neutrinos, performed with the Borexino detector at Laboratori Nazionali del Gran Sasso. Anti-neutrinos are detected through the neutron inverse beta decay reaction. With a 252.6 ton-yr fiducial exposure after all selection cuts, we detected 9.9^{+4.1}_{-3.4}(^{+14.6}_{-8.2}) geo-neutrino events, with errors corresponding to a 68.3%(99.73%) C.L. From the $\ln{\cal{L}}$ profile, the statistical significance of the Borexino geo-neutrino observation corresponds to a 99.997% C.L. Our measurement of the geo-neutrinos rate is 3.9^{+1.6}_{-1.3}(^{+5.8}_{-3.2}) events/(100ton-yr). This measurement rejects the hypothesis of an active geo-reactor in the Earth's core with a power above 3 TW at 95% C.L. The observed prompt positron spectrum above 2.6 MeV is compatible with that expected from european nuclear reactors (mean base line of approximately 1000 km). Our measurement of reactor anti-neutrinos excludes the non-oscillation hypothesis at 99.60% C.L.Comment: 8 pages, 4 figures, 3 table

The association of APAI-Polymorphism of vitamin D receptor gene (VDR) with development of generalized parodontitis in Ukrainian population

Introduction: At present, it is believed that the genetic component is important in the pathogenesis of periodontitis. One of the candidate genes that are of major importance in the development of the disease is the vitamin D receptor gene (VDR). The association of its genetic polymorphisms, in particular Apal, with periodontitis in different populations of the world is proved. The aim: To study the association of the Apal-polymorphism VDR gene with the development of generalized periodontitis in the Ukrainian population. Materials and methods: Patient genotypes were determined by polymerase chain reaction with subsequent analysis of restriction fragment length (PCR-RFLP) from buccal epithelium 116 patients with generalized periodontitis (GP) and 67 individuals of control group. Statistical analysis was performed by using SPSS-17,0 program Results: As a result of the performed studies, it was shown that in the group of patients with GP, the ratio of homozygous for the main allele (a/a), heterozygote (a/A) and homozygote for the minor allele (A/A) was 26 (22,4%), 62 (53,4%), 28 (24,2%), and in control group – 25 (37,3%), 27 (40,3%), 15 (22,4%),respectively. The distribution of genotypes in the comparison groups was not statistically significant (P = 0,084). By the method of binary logistic regression in the framework of the additive inheritance model (a/A vs a/a), a reliable relationship of the genotype with the Apal-polymorphism of the VDR gene was established with the development of generalized periodontitis (Р=0,029). It was shown that in heterozygotes(a/A)the risk of GP in2,208 (95%CI = 1,084-4,496) times is hig her than in homozygotes of the main allele (a/a). After adjusting for age, sex, smoking habit, BMI, the reliability of these results was maintained (P = 0,030

Azimuthal anisotropy and correlations in p+p, d+Au and Au+Au collisions at 200 GeV

We present the first measurement of directed flow ($v_1$) at RHIC. $v_1$ is found to be consistent with zero at pseudorapidities $\eta$ from -1.2 to 1.2, then rises to the level of a couple of percent over the range $2.4 < |\eta| < 4$. The latter observation is similar to data from NA49 if the SPS rapidities are shifted by the difference in beam rapidity between RHIC and SPS. Back-to-back jets emitted out-of-plane are found to be suppressed more if compared to those emitted in-plane, which is consistent with {\it jet quenching}. Using the scalar product method, we systematically compared azimuthal correlations from p+p, d+Au and Au+Au collisions. Flow and non-flow from these three different collision systems are discussed.Comment: Quark Matter 2004 proceeding, 4 pages, 3 figure

Azimuthal anisotropy: the higher harmonics

We report the first observations of the fourth harmonic (v_4) in the azimuthal distribution of particles at RHIC. The measurement was done taking advantage of the large elliptic flow generated at RHIC. The integrated v_4 is about a factor of 10 smaller than v_2. For the sixth (v_6) and eighth (v_8) harmonics upper limits on the magnitudes are reported.Comment: 4 pages, 6 figures, contribution to the Quark Matter 2004 proceeding

All-optical switching and strong coupling using tunable whispering-gallery-mode microresonators

We review our recent work on tunable, ultrahigh quality factor whispering-gallery-mode bottle microresonators and highlight their applications in nonlinear optics and in quantum optics experiments. Our resonators combine ultra-high quality factors of up to Q = 3.6 \times 10^8, a small mode volume, and near-lossless fiber coupling, with a simple and customizable mode structure enabling full tunability. We study, theoretically and experimentally, nonlinear all-optical switching via the Kerr effect when the resonator is operated in an add-drop configuration. This allows us to optically route a single-wavelength cw optical signal between two fiber ports with high efficiency. Finally, we report on progress towards strong coupling of single rubidium atoms to an ultra-high Q mode of an actively stabilized bottle microresonator.Comment: 20 pages, 24 figures. Accepted for publication in Applied Physics B. Changes according to referee suggestions: minor corrections to some figures and captions, clarification of some points in the text, added references, added new paragraph with results on atom-resonator interactio

Strange Resonance Production in p+p and Au+Au Collisions at RHIC Energies

Resonance yields and spectra from elementary p+p and Au+Au collisions at $\sqrt{s_{\rm NN}} =$ 200 GeV from the STAR experiment at RHIC are presented and discussed in terms of chemical and thermal freeze-out conditions. Thermal models do not adequately describe the yields of the resonance production in central Au+Au collisions. The approach to include elastic hadronic interactions between chemical freeze-out and thermal freeze-out suggests a time of $\Delta \tau>$5 fm/c.Comment: 4 pages, 7 figures, proceedings of the Quark Matter 2004, in Oakland, California, to be published in Journal of Physics G: Nuclear and Particle Physic