Cardinal p and a theorem of Pelczynski

We show that it is consistent that for some uncountable cardinal k, all compactifications of the countable discrete space with remainders homeomorphic to $D^k$ are homeomorphic to each other. On the other hand, there are $2^c$ pairwise non-homeomorphic compactifications of the countable discrete space with remainders homeomorphic to $D^c$ (where c is the cardinality of the continuum)

On spaces in countable web

We show that a Tychonoff discretely star-Lindelof space can have arbitrarily big extent and note that there are consistent examples of normal discretely star-Lindelof spaces with uncountable extent

Screening Models for Cardiac Risk Evaluation in Emergency Abdominal Surgery. I. Evaluation of the Intraoperative Period Risk based on Data from the Preoperative Period

A classification of intraoperative cardio-vascular complications (CVC) was performed, based on data from 466 patients subjected to emergency surgery, due to severe abdominal surgical diseases or traumas, in accordance with the severe criteria of ACC/AHA for CVC in noncardiac surgery. There were 370 intraoperative CVC registered, distributed as follows: groups with low risk (148), moderate risk (200), and high risk (22). Patient groups were formed, according to the CVC risk level, during the intraoperative period, for which the determinant factor for the group distribution of patients was the complication with the highest risk. Individual data was collected for each patient, based on 65 indices: age, physical status, diseases, surgical interventions, anaesthesiological information, intra and postoperative cardio-vascular complications, disease outcome, causes of death, cardiovascular disease anamnesis, anamnesis of all other nonsurgical diseases present, laboratory results, results from all imaging and instrumental examinations, etc. On the basis of these indices, a new distribution of the risk factors was implemented, into groups with different levels of risk of CVC during intraoperative period. This result is a solid argument, substantiating the proposal to introduce these adjustments for determining the severity of CVC in the specific conditions of emergency abdominal surgery

Screening Models for Cardiac Risk Evaluation in Emergency Abdominal Surgery. II. Evaluation of the Postoperative Period Risk based on Data from the Pre- and Intraoperative Period

A classification of intraoperative (IO) and postoperative (PO) cardio-vascular complications (CVC) was performed, based on data from 466 patients subjected to emergency surgery, due to severe abdominal surgical diseases or traumas, in accordance with the severe criteria of ACC/AHA in CVC for non-cardiac surgery. There were 370 intra and 405 postoperative (IO; PO) CVC registered, distributed as follows: groups with low risk (IO: 148; PO: 87), moderate risk (IO: 200; PO: 225), and high risk (IO: 22; PO: 93). Patient groups were formed, according to the CVC risk level, during the intra- and postoperative periods, for which the determinant factor for the group distribution of patients was the complication with the highest risk. Individual data was collected for each patient, based on 65 indices: age, physical status, diseases, surgical interventions, anaesthesiological information, intra and postoperative cardio-vascular complications, disease outcome, causes of death, cardio-vascular disease anamnesis, anamnesis of all other nonsurgical diseases present, laboratory results, results from all imaging and instrumental examinations, etc. The trend toward increase or decrease of the CVC risk was studied during the transition from intra- to the postoperative period. On the basis of these indices, a new distribution of the patients was implemented, into groups with different levels of risk of CVC during intra- and postoperative. This result is a solid argument, substantiating the proposal to introduce these adjustments to the ACC/AHA criteria for determining the severity of CVC in the specific conditions of emergency abdominal surgery

Brainstem Auditory Evoked Potentials in Patients with Subarachnoid Haemorrhage

Objective. The aim of the present study is to typify BAEPs configurations of patients with different location of lesions caused by subarachnoid haemorrhage (SAH) and the ensuing complications, in view of assessing the auditory-brainstem system disturbance.Methods. The typization was performed by comparing BAEPs with standard patterns from two sets of types of BAEPs by ipsilateral and binaural stimulation and by cross-stimulation.Results. 94 BAEPs were used for collection of normal referential values: for the absolute latencies and the absolute amplitudes of waves I, II, III, IV and V; for inter-peak latencies I-III, II-III, III-V, I-V and II-V; for amplitude ratios I/V and III/V. 146 BAEPs of patients with mild SAH and 55 from patients with severe SAH, were typified. In 5 types of BAEPs out of a total of 11, the percentage of the potentials in patients with mild SAH and severe SAH differed significantly (p<0.01).Conclusions. The use of sets of types of BAEPs by ipsilateral, binaural and cross-stimulation correctly classifies the potentials in patients with mild and severe SAH

Variations of selective separability

AbstractA space X is selectively separable if for every sequence (Dn:n∈ω) of dense subspaces of X one can select finite Fn⊂Dn so that ⋃{Fn:n∈ω} is dense in X. In this paper selective separability and variations of this property are considered in two special cases: Cp spaces and dense countable subspaces in 2κ

Bulgarian Youth and Europe. Multivariate Psycho-cultural Study of the Mobility Attitudes

The objective of this study is to examine the Bulgarian youths' mobility towards Europe. The investigation was carried out with 570 Bulgarian students. The data are presented as a questionnaire consisting of five parts. The first one deals with the motivations and is based on the Reversal Theory - predicting eight motivational states. The second part is based on the 2PAP theoretical model structuring the attitudes around four factors: Push, Pull, Anti Push and Anti Pull. The third one falls back on the Big Five Personality Test measuring five personality dimensions. And the concluding two parts are designed to obtain information about the degree of attraction and the intentions for mobility to the 25 destination countries of the European Union (EU). This has led to the hypothesis that a model of mobility exists based on these three theoretical models, as well as on emotional factors like attraction-repulsion to the country referred to. The hypothesis that was strongly supported by the statistical processing of the data will broaden our understanding of the youth's mobility. The present research is a part of a longitudinal study of the mobility intentions among young people. The investigation is of great interest from an educational, political and social point of vie

Evaluation of Data Transmission at 80MHz and 160MHz Over Backplane, Copper and Optical Links

The bunch clock frequency of the LHC accelerator at CERN is specified as 40.07897 MHz [1]. Most of the LHC experiments will utilize this frequency, its multiples or derivatives as the main frequency of data transmission for their synchronous Trigger and DAQ electronic systems. For example, the triggering system of the Cathode Strip Chamber (CSC) sub-detector at the CMS experiment comprises the onchamber anode and cathode electronics, the off-chamber boards housed in 9U crates mounted on the periphery of the Endcap iron disks, and one Track Finder (TF) crate located in the underground counting room (Fig.1). Due to the significant amount of data from the front end, the trigger patterns are multiplexed and sent from the CSC chambers over copper cables using the LVDS standard at 80 MHz. For the same reason the data patterns transmitted over backplanes in the peripheral and TF crates are also multiplexed and sent at 80MHz using the GTLP standard. Optical links from the peripheral crates to the TF are operated at 80 MHz as well. Finally, the parallel LVDS links to the Global Muon Trigger (GMT) run at 40 MHz

Composition of Ni2+ cation solvation shell in NiCl2–methanol solution by multinuclear NMR

1H-, 2H- and 13C-NMR spectra have been used to test the Ni2+ solvation shell composition in the 1.1 molal methanol solution of NiCl2. It has been confirmed that Cl− anion takes part in the nearest environment of Ni2+ cation at all the temperatures investigated. Using 2H-NMR allowed us to detect for the first time OD-signal of methanol in the primary solvation shell of Ni2+ cation. Both 2H- and 13C-NMR spectra show that the composition of the cation solvation shell becomes more complicated at temperatures lower than 220 K

Klein tunneling in carbon nanostructures: a free particle dynamics in disguise

The absence of backscattering in metallic nanotubes as well as perfect Klein tunneling in potential barriers in graphene are the prominent electronic characteristics of carbon nanostructures. We show that the phenomena can be explained by a peculiar supersymmetry generated by a first order Hamiltonian and zero order supercharge operators. Like the supersymmetry associated with second order reflectionless finite-gap systems, it relates here the low-energy behavior of the charge carriers with the free particle dynamics.Comment: 4 pages, 1 fig., typos correcte