Mining the ESO WFI and INT WFC archives for known Near Earth Asteroids. Mega-Precovery software

The ESO/MPG WFI and the INT WFC wide field archives comprising 330,000 images were mined to search for serendipitous encounters of known Near Earth Asteroids (NEAs) and Potentially Hazardous Asteroids (PHAs). A total of 152 asteroids (44 PHAs and 108 other NEAs) were identified using the PRECOVERY software, their astrometry being measured on 761 images and sent to the Minor Planet Centre. Both recoveries and precoveries were reported, including prolonged orbital arcs for 18 precovered objects and 10 recoveries. We analyze all new opposition data by comparing the orbits fitted before and after including our contributions. We conclude the paper presenting Mega-Precovery, a new online service focused on data mining of many instrument archives simultaneously for one or a few given asteroids. A total of 28 instrument archives have been made available for mining using this tool, adding together about 2.5 million images forming the Mega-Archive.Comment: Accepted for publication in Astronomische Nachrichten (Sep 2012

ASPECTS ON THEORETICAL ANALYSIS OF WORKING PROCESS PERFORMED BY TECHNICAL EQUIPMENTS FOR CHOPPING PLANT DEBRIS IN ORDER TO CLEAR THE FIELD

The paper presents theoretical aspects on working process of rotors of technical equipments designed for chopping vegetal debris and fodders. Generally, the chopping devices with rotor, with the rotor axle in horizontal plane and normal position (perpendicular) with the machinery moving direction are used for constructing equipments for harvesting fodder crops or for those of chopping vegetal debris where they perform multiple tasks. They make the cutting, the chopping of plants and throwing the chopped material into the collecting trail or, with the case of cutting and chopping machinery, the evenly spreading of chopped material over the soil surface. The main factors that influence the chopping degree are the physical – mechanical features of the chopping material that are very different with the crop variety and the constructive and functional parameters of the chopping device

THE ANALYSIS OF THE EXPERIMENTAL RESULTS AND OPTIMIZATION OF SEEDBED PREPARATION WITH WINTER WHEAT CROP

The paper presents experimental results and the optimization of several variants for seedbed preparation for winter wheat crop. There are taken into account six technological variants for seedbed preparation and there were studied, after sowing, the soil penetration resistance and soil structural aggregates water stability as well as the fuel consumption per hectare, the yield and there were made recommendations on the best options for conservative tillages

Apparent close approaches between near-Earth asteroids and quasars. Precise astrometry and frame linking

Reproduced with permission. Copyright ESO. Article published by EDP Sciences and available at www.aanda.org.International audienceAims. We investigate the link between the International Celestial Reference Frame (ICRF) and the dynamical reference frame realized by the ephemerides of the Solar System bodies. Methods. We propose a procedure that implies a selection of events for asteroids with accurately determined orbits crossing the CCD field containing selected quasars. Using a Bulirsch-Stoer numerical integrator, we constructed 8-years (2010-2018) ephemerides for a set of 836 numbered near-Earth asteroids (NEAs). We searched for close encounters (within a typical field of view of groundbased telescopes) between our selected set of asteroids and quasars with high-accuracy astrometric positions extracted from the Large Quasars Astrometric Catalog (LQAC). Results. In the designated period (2010-2018), we found a number of 2924, 14 257, and 6972 close approaches (within 10') between asteroids with a minimum solar elongation value of 60◦and quasars from the ICRF-Ext2, the Very Large Baseline Array Calibrator Survey (VLBA-CS), and the Very Large Array (VLA), respectively. This large number of close encounters provides the observational basis needed to investigate the link between the dynamical reference frame and the ICRF

739 observed NEAs and new 2-4m survey statistics within the EURONEAR network

We report follow-up observations of 477 program Near-Earth Asteroids (NEAs) using nine telescopes of the EURONEAR network having apertures between 0.3 and 4.2 m. Adding these NEAs to our previous results we now count 739 program NEAs followed-up by the EURONEAR network since 2006. The targets were selected using EURONEAR planning tools focusing on high priority objects. Analyzing the resulting orbital improvements suggests astrometric follow-up is most important days to weeks after discovery, with recovery at a new opposition also valuable. Additionally we observed 40 survey fields spanning three nights covering 11 sq. degrees near opposition, using the Wide Field Camera on the 2.5m Isaac Newton Telescope (INT), resulting in 104 discovered main belt asteroids (MBAs) and another 626 unknown one-night objects. These fields, plus program NEA fields from the INT and from the wide field MOSAIC II camera on the Blanco 4m telescope, generated around 12,000 observations of 2,000 minor planets (mostly MBAs) observed in 34 square degrees. We identify Near Earth Object (NEO) candidates among the unknown (single night) objects using three selection criteria. Testing these criteria on the (known) program NEAs shows the best selection methods are our epsilon-miu model which checks solar elongation and sky motion and the MPC's NEO rating tool. Our new data show that on average 0.5 NEO candidates per square degree should be observable in a 2m-class survey (in agreement with past results), while an average of 2.7 NEO candidates per square degree should be observable in a 4m-class survey (although our Blanco statistics were affected by clouds). At opposition just over 100 MBAs (1.6 unknown to every 1 known) per square degree are detectable to R=22 in a 2m survey based on the INT data, while our two best ecliptic Blanco fields away from opposition lead to 135 MBAs (2 unknown to every 1 known) to R=23.Comment: Published in Planetary and Space Sciences (Sep 2013

COMPARATIVE STUDY ON THE USE OF GNSS TECHNOLOGY AND TOTAL STATIONS IN THE GENERAL CADASTRE WORKS IN ROMANIA

It presents the use of GNSS technology and total stations in the general cadastre works in Romania and a comparative study between the two methods of measurement, and their use together. When using total stations and other '' classical '' measurement methods, it is imperative to reduce projection distance before compensating for the measurements and then determining the coordinates. The widespread use in Romania of measurement methods using GNSS technology and the RTK measurement method, especially the latter for detail points, is beneficial because distance reduction is no longer necessary and generally there are no problems as before when distances are measured with total stations if it is not reduced to the projection plan. Finally, conclusions are drawn from the use of GNSS technology and total stations separately and together in cadastral elevations for the general cadastre. Conclusions on the methods of measurement and the study compared to the two methods of measurement are auspicious and should be learned by those working for the implementation of the general cadastre in Romania.

SOME ASPECTS REGARDING THE USE OF GNSS TECHNOLOGY IN THE GENERAL CADASTRE WORKS IN ROMANIA

Is the use of GNSS technology in general cadastral works in Romania, in areas where this technology must take into account some aspects regarding the reception signals and the use of a measuring RTK that is otherwise agreed by ANCPI with some clarifications. Accuracy and issues that have to be respected in raising cadastral in Romania and in general cadastre are presented in this work and here presents ways that can fulfill the requirements, the Director ANCPI Order 700 as amended and the Law. 7/96. Finally, the conclusions drawn from the use of GNSS technology in cadastral elevations for the general cadastre are complied with, in compliance with the rules in force

EURONEAR - Recovery, Follow-up and Discovery of NEAs and MBAs using Large Field 1-2m Telescopes

We report on the follow-up and recovery of 100 program NEAs, PHAs and VIs using the ESO/MPG 2.2m, Swope 1m and INT 2.5m telescopes equipped with large field cameras. The 127 fields observed during 11 nights covered 29 square degrees. Using these data, we present the incidental survey work which includes 558 known MBAs and 628 unknown moving objects mostly consistent with MBAs from which 58 objects became official discoveries. We planned the runs using six criteria and four servers which focus mostly on faint and poorly observed objects in need of confirmation, follow-up and recovery. We followed 62 faint NEAs within one month after discovery and we recovered 10 faint NEAs having big uncertainties at their second or later opposition. Using the INT we eliminated 4 PHA candidates and VIs. We observed in total 1,286 moving objects and we reported more than 10,000 positions. All data were reduced by the members of our network in a team effort, and reported promptly to the MPC. The positions of the program NEAs were published in 27 MPC and MPEC references and used to improve their orbits. The O-C residuals for known MBAs and program NEAs are smallest for the ESO/MPG and Swope and about four times larger for the INT whose field is more distorted. The incidental survey allowed us to study statistics of the MBA and NEA populations observable today with 1--2m facilities. We calculate preliminary orbits for all unknown objects, classifying them as official discoveries, later identifications and unknown outstanding objects. The orbital elements a, e, i calculated by FIND_ORB software for the official discoveries and later identified objects are very similar with the published elements which take into account longer observational arcs; thus preliminary orbits were used in statistics for the whole unknown dataset. (CONTINUED)Comment: Accepted in Planetary and Space Science (Aug 2011

Kinetic Characterisation of a Single Chain Antibody against the Hormone Abscisic Acid: Comparison with Its Parental Monoclonal

A single-chain Fv fragment antibody (scFv) specific for the plant hormone abscisic acid (ABA) has been expressed in the bacterium Escherichia coli as a fusion protein. The kinetics of ABA binding have been measured using surface plasmon resonance spectrometry (BIAcore 2000) using surface and solution assays. Care was taken to calculate the concentration of active protein in each sample using initial rate measurements under conditions of partial mass transport limitation. The fusion product, parental monoclonal antibody and the free scFv all have low nanomolar affinity constants, but there is a lower dissociation rate constant for the parental monoclonal resulting in a three-fold greater affinity. Analogue specificity was tested and structure-activity binding preferences measured. The biologically-active (+)-ABA enantiomer is recognised with an affinity three orders of magnitude higher than the inactive (-)-ABA. Metabolites of ABA including phaseic acid, dihydrophaseic acid and deoxy-ABA have affinities over 100-fold lower than that for (+)-ABA. These properties of the scFv make it suitable as a sensor domain in bioreporters specific for the naturally occurring form of ABA