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Search Results: 1 - 10 of 1323 matches for " Mihai BOTU "
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BEHAVIOUR OF SOME WALNUT, HAZELNUT AND SWEET CHESTNUT CULTIVARS UNDER THE ENVIRONMENTAL CONDITIONS FROM SOUTH OF ROMANIA
Mihai Botu,Adina Vicol,Ion Botu,Silvia Preda
Fruit Growing Research , 2012,
Abstract: The nut crops are important for their valuable fruits and for their potential to increase the economic growth of Romania. The Southern part of Romania which includes the regions of Oltenia and Muntenia is known for its favourable conditions for fruit growing and in particular for nut crops like walnut, hazelnut and sweet chestnut. During the last two decades at University of Craiova - SCDP Valcea several cultivars trials were set up in order to compare the Romanian and foreign cultivars and to establish the most favourable ones for culture in this part of the country. This study presents the behaviour of 19 walnut cultivars (9 Romanian ones and 10 of foreignorigin), 19 hazelnut cultivars (8 Romanian and 11 foreign ones) and 11 cultivars and hybrids of sweet chestnut (3 Romanian and 8 of foreign origin). Due to the results obtained several cultivars of walnut, hazelnut and sweet chestnut are recommended to be propagated and planted into the orchards from southern part of Romania.
Determination of Apomictic Fruit Set Ratio in Several Romanian Walnut (Juglans regia L.) Cultivars
Sina COSMULESCU,Mihai BOTU,Gheorghe ACHIM
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2012,
Abstract: Apomixis, a natural process that allows clonal propagation by seed, is an important feature of walnut (Juglans regia L.). This study was carried out to determine the ability of apomictic fruit setting in twelve Romanian walnut cultivars. ‘Sibisel 44’, ‘Geoagiu 65’, ‘Germisara’, ‘Muscelean’, ‘Sarmis’, ‘Valcor’, ‘Valmit’, ‘Valrex’, ‘Jupanesti’, ‘Velnita’, ‘Orastie’ and ‘Argesean’ cultivars were used in the experiment. Female flowers were isolated with pergament paper bags and the apomictic fruit set was determined 8 weeks after anthesis. The apomixis degree was determined as the number of fruit calculated in relation to the number of isolated flowers. The percentage of apomictic fruit set without pollination in cultivars analyzed is low, ranging from 7.86% (‘Orastie’ cultivar) up to 12.46% (‘Jupanesti’ cultivar). The results indicated that apomictic fruit set is insufficient for economical seed and crop production in these Romanian walnut cultivars.
COMPARATIVE STUDY ON THE RESPONSE OF SEVERAL PLUM CULTIVARS IN CENTRAL TRANSYLVANIA CONDITIONS, ROMANIA
Radu SESTRAS,Mihai BOTU,Viorel MITRE,Adriana SESTRAS
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2007,
Abstract: In the conditions of central Transylvania, Romania, five plum cultivars were studied, with different fruit ripening: earlier (Tuleu timpuriu), semi-earlier (Reine Claude d'Althan), medium (Valor), semi-late (Vinete de Italia), late (Vinete romanesti). Tuleu timpuriu and Reine Claude d'Althan distinguish for their high productivity (over 20 kg of fruits per tree), Valor for the large fruits (with the average of 68.0 g, but with a lower quality), Vinete romanesti and Vinete de Italia for their extreme susceptibility to the most important diseases (Polystigma rubrum and Plum-pox virus). One of the traditional plum cultivars from Romania, still largely spread in Transylvania, Vinete romanesti, which is very appreciated, both for its fruit taste and for the alcohol distillation obtained, confirmed its estimation due to fruit quality. Vinete romanesti has small fruits compared to the actual commercial requirement of the fresh plum, low productivity, and it is extremely susceptible to Plum-pox virus and Polystigma rubrum attack, thus the cultivar unfulfills the conditions for modern cultivars. In addition, the cultivar can be used in plum breeding, as genitor for quality (taste of fruits) and the low vigour of trees. The high values of the heritability coefficient, in a broad sense, applied to the majority of the analyzed traits, suggest that, through an adequate selection of the genitors, descendents, which can present valuable traits from the parental form, can be obtained and thus, new cultivars can be selected. Vinete romanesti can be used in plum breeding, as genitor for quality (taste of fruits) and the low vigour of trees.
Mineral Composition of Fruits in Different Walnut (Juglans regia L.) Cultivars
Sina Niculina COSMULESCU,Adrian BACIU,Gheorghe ACHIM,Mihai BOTU
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2009,
Abstract: Walnuts are considered to be a good source of dietary minerals. Mineral composition was determined in nine walnut cultivars (‘Mihaela’, ‘Roxana’, ‘Velnita’, ‘Geoagiu 65’, ‘Jupanesti’, ‘Valcor’, ‘Valmit’, ‘Valrex’, ‘Argesan’) originated from Romania. A Milestone digestion microwave system was used for mineralization of solid samples. Microelements: Na, Ca, Mg, Fe, Mn, Cu, Se, Al, Cr, Zn, Sr and Rb were determined by using ICP-MS as measurement tool, and K content was determined with an atomic absorption spectrometer in flame, by using as excitation source the cavitar cathode lamp for potassium. Mineral elements content presented significant differences from a cultivar to another. Potassium content has varied between 357.1 mg/100g in ‘Valmit‘ cultivar, and 499.6 mg/100g, in ‘Geoagiu 65’ cultivar, recording significant differences from the average (414.0 mg/100g) in ‘Velnita‘, ‘Roxana‘and ‘Argesan‘cultivars. Magnesium content varied between 189.2 mg/100 g in ‘Mihaela’ cultivar and 278.1 mg/100 g in ‘Argesan’ cultivar, significant differences from the average (216.6 mg/100g) were obtained in cultivars ‘Geoagiu 65‘, ‘Valrex‘, ‘Argesan‘. The order of nutritive elements depending on their content/100 g of produce was K>Mg>Ca>Mn>Fe> Cu>Zn>Na>Cr>Al>Rb>Sr. Comparing obtained data with the ones existing in the literature, Romanian walnut cultivars proved to be important sources of nutritive elements, and walnut kernel consumption can contribute to a well balanced diet.
Phenolics of Green Husk in Mature Walnut Fruits
Sina Niculina COSMULESCU,Ion TRANDAFIR,Gheorghe ACHIM,Mihai BOTU
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2010,
Abstract: Qualitative and quantitative determinations of phenolic compounds were carried out on green husk (mesocarp) of mature walnut fruits collected in September of five walnut (Juglans regia L.) cultivars (‘Germisara’, ‘Jupanesti’, ‘Franquette’, ‘Vina’, ‘Valcor’) grown in an uniform agroclimatic condition. Six compounds (ferulic acid, vanillic acid, coumaric acid, syringic acid, myricetin and juglone) were identified in all the cultivars by using reverse phase-high performance liquid chromatography (HPLC-RP).
Ab-Initio Molecular Dynamics Acceleration Scheme with an Adaptive Machine Learning Framework
Venkatesh Botu,Rampi Ramprasad
Physics , 2014,
Abstract: Quantum mechanics based ab-initio molecular dynamics (MD) simulation schemes offer an accurate and direct means to monitor the time-evolution of materials. Nevertheless, the expensive and repetitive energy and force computations required in such simulations lead to significant bottlenecks. Here, we lay the foundations for such an accelerated ab-initio MD approach integrated with a machine learning framework. The proposed algorithm learns from previously visited configurations in a continuous and adaptive manner on-the-fly, and predicts (with chemical accuracy) the energies and atomic forces of a new configuration at a minuscule fraction of the time taken by conventional ab-initio methods. Key elements of this new accelerated ab-initio MD paradigm include representations of atomic configurations by numerical fingerprints, the learning algorithm, a decision engine that guides the choice of the prediction scheme, and requisite amount of ab-initio data. The performance of each aspect of the proposed scheme is critically evaluated for Al in several different chemical environments. This work can readily be extended to address non-elemental compounds, and has enormous implications beyond ab-initio MD acceleration. It can also lead to accelerated structure and property prediction schemes, and accurate force-fields.
A learning scheme to predict atomic forces and accelerate materials simulations
Venkatesh Botu,Rampi Ramprasad
Physics , 2015, DOI: 10.1103/PhysRevB.92.094306
Abstract: The behavior of an atom in a molecule, liquid or solid is governed by the force it experiences. If the dependence of this vectorial force on the atomic chemical environment can be $learned$ efficiently with high-fidelity from benchmark reference results-using "big data" techniques, i.e., without resorting to actual functional forms-then this capability can be harnessed to enormously speed up $in \ silico$ materials simulations. The present contribution provides several examples of how such a $force$ field for Al can be used to go far beyond the length-scale and time-scale regimes accessible presently using quantum mechanical methods. It is argued that pathways are available to systematically and continuously improve the predictive capability of such a learned force field in an adaptive manner, and that this concept can be generalized to include multiple elements.
Assessing Qualitative Performances of some Fruits from the Ecological Area of Oltenia
BOTU I.,Silvia PREDA,C. PREDESCU,M. BOTU
Proenvironment Promediu , 2009,
Abstract: Oltenia region is one of the most favorable for the cultivation of species of temperate climate fruit (apple,plum, peach, apricot, walnut, etc.). It contains numerous micro (pools fruit) with optimal environmental conditions,cultural traditions, economic and social interest to allow the achievement of quality performance and international tradeof fruit produced on the farm. Microzonarea, establishing the sorts of valuable varieties and application of hightechnologies allow both a high productivity/ha, and obtain special quality fruit. The fruits examined in several speciesand varieties showed performance was monitored in terms of morphological quality, taste, the content of heavy metals(Cd, Pb and Cu) and residues from some pesticides (αHCH, γHCH, PCB52 , PCB28, PCB180, HCB, heptachlor, aldrin,εHCH, Heptachlor - Epoxy, βendosulfan, PP'-DDE, etc.). Elements have been pursued as compared with those used inthe EU and international trade. The fruits of apple, plum, peach, apricot and walnut orchards in Oltenia basins obtainedlegally correspond morphologically as size, weight, color and uniformity is achieved while respecting their microzon riiand superior technologies. Taste of the fruits from Oltenia farms is far superior to other similar fruit from other areas ofculture. Fruits of Oltenia meet commercial and sanogen because they contain heavy metal (Cd and Pb), well below themaximum level of EU fruit and some pesticide residue content is below the international standards or missing entirely(αHCH, Aldrin, εHCH, PCB 180) and others are found in very small quantities, without an influence on consumers. Toensure high quality fruit in Oltenia is necessary to provide constant monitoring and accountability.
Maximal Phase Space Compression  [PDF]
Mihai Dima, Marian Petre
Journal of Signal and Information Processing (JSIP) , 2013, DOI: 10.4236/jsip.2013.42024
Abstract:

The (seldomly quoted) generalised-Heisenberg uncertainty relations are an effect of the quantum correlation coefficient inequalities. The quantum correlation coefficient determines how much a state can be compacted and on what basis. It is shown that how this can be used to best compress a signal (such as a radio wave, or a 2D laser complex field at a focal plane) while at the same time encrypting the signal.

The IRIS Development Platform and Proposed Object-Oriented Data Base  [PDF]
Mihai-Octavian Dima
Journal of Software Engineering and Applications (JSEA) , 2015, DOI: 10.4236/jsea.2015.84017
Abstract: Various code development platforms, such as the ATHENA Framework [1] of the ATLAS [2] experiment encounter lengthy compilation/linking times. To augment this situation, the IRIS Development Platform was built as a software development framework acting as compiler, cross-project linker and data fetcher, which allow hot-swaps in order to compare various versions of software under test. The flexibility fostered by IRIS allowed modular exchange of software libraries among developers, making it a powerful development tool. The IRIS platform used input data ROOT-ntuples [3]; however a new data model is sought, in line with the facilities offered by IRIS. The schematic of a possible new data structuring—as a user implemented object oriented data base, is presented.
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