Environmental issues and process risks for operation of carbon capture plant

The scope of this publication is a presentation of environmental issues and process risks connected with operation an installation for carbon capture from waste gas. General technological assumptions, typical for demonstration plant for carbon capture from waste gas (DCCP) with application of two different solutions – 30% water solution of monoethanoloamine (MEA) and water solution with 30% AMP (2-amino-2-methyl-1-propanol) and 10% piperazine have been described. The concept of DCCP installation was made for Łaziska Power Plant in Łaziska Górne owned by TAURON Wytwarzanie S.A. Main hazardous substances, typical for such installation, which can be dangerous for human life and health or for the environment have been presented. Pollution emission to the air, noise emission, waste water and solid waste management have been described. The environmental impact of the released substances has been stated. Reference to emission standards specified in regulations for considered substances has been done. Principles of risk analysis have been presented and main hazards in carbon dioxide absorption node and regeneration node have been evaluated.

A Single Side-Band Modulation Circuit in Underwater Electric Current Communication

On the basis of the carrier has a low frequency in underwater electric current communication, carrier phase shift network, low frequency wide band phase shift network and multiplier circuit were designed to realize the single side-band (SSB) modulation. The circuits were designed and debugged. Through testing the actual circuits, sideband suppression ratio obtains 36dB which can satisfy the underwater electric current communication system. It will be stated reference on actual application for SSB modulation with low carrier frequency using phase shift method.

Remarks to Calibration in Chemistry

Calibration is the operation establishing metrological traceability of values of calibrated measuring instrument scale (or reference material) to stated reference. In the case of indirect measurement it is necessary to know the relationship between determined quantity values and corresponding measurand values. If mathematic form of this relationship is unknown, it is substituted by its approximation. In this process a real situation is simplified by neglecting of influence quantities to a relation of two variables- independent versus dependent. Metrological traceability of certified reference materials (CRM) values intended for calibration purposes and characterised by means of a method working on the base of approximative function could be questionable. If a measurement method based on original relationship already exists, it should be strongly preferred in the process of CRM certification to methods based on approximation of original relationship.

Insects found in birds’ nests from Argentina. Part I: a bibliographical review, with taxonomical corrections, comments and a hypothetical mechanism of transmission of cimicid bugs

A bibliographical review of the insects found in birds’ nests from Argentina is herein presented. The bird species are cited as they were originally recorded in the respective publications, but their nomenclature is updated. For each kind of nest, the data are ordered in the following manner: by insect order, family, subfamily and species (references, without locality) and by province: locality with specimens when stated (reference with locality data). Comments on nomenclature and some corrections are included under the respective notes. Three items that have received most attention were the hematophagous Reduviidae: Triatominae, Cimicidae, and the larvae of Philornis (Diptera: Muscidae). Identifications of other insects are scarce, and were explicitly mentioned in only three short works, and in an anecdotal manner in other papers. In general, insects found in birds’ nests may be grouped by ecological guilds (predators, hematophagous parasitoids, detritivores, phytophagous and some predator insect hibernants, and inquilines), permanency (temporal and permanent residents) inside the nests, and according to their direct relationship to the birds. A transmission mechanism is hypothesized for the hematophagous bugs of the family Cimicidae based upon data on birds that nidificate in nests of other birds. Some new records are included.

The Estimation of Set Size by Potentially Gifted Kindergarten-Age Children

The study explored young children's ability to estimate set sizes and use reference points such as 10. Eighteen children in a preschool-kindergarten program for the potentially gifted were asked to estimate the number of dots in a set (range 3 to 35); to gauge whether a set of dots was larger or smaller than a stated reference point of 5, 10, or 20; and to judge where a set fit in regard to two given reference points. With sets of 8, most estimates were within 25% of the actual value; with sets of 15 or larger, most estimates were not. A majority of children were successful on the task with a single reference point; performance varied on the task with two reference points. An error analysis indicated that many children could accurately place sets somewhat smaller than a reference point but had difficulty placing sets somewhat larger than a reference point. These results suggest that the children had not constructed accurate perceptual anchors but appeared to have an overexaggerated mental image of 5, 10, and 20.