VERIFICATION OF FORCE TRANSDUCER FOR DIRECT AND INDIRECT MEASUREMENTS

Paper deals with verification of high load force sensor using the small weight weights. Test band was built for this purpose. Verification of test band were executed using the etalon reference sensor. Small forces were executed via using the direct method through the applying of weights. High forces were executed using the indirect method through the lever amplification of load derived from small weights. Uncertainties of measurement were evaluated.

Isolation of Phthalates and Terephthalates from Plant Material – Natural Products or Contaminants?

Dialkyl phthalates have been used as plasticizers in polymers for decades. As mobile, small weight molecules, phthalates have entered the environment, where they have become ubiquitous. On the other hand, phthalates continue to be isolated from natural sources, plants, bacteria and fungi as bona fide natural products. Here, doubt remains as to whether the phthalates represent actual natural products or whether they should all be seen as contaminants of anthropogenic origin. The following article will review the material as presented in the literature.

Bychkov V. V. Strategic concept for the development of non-strategic missiles - sea-based complexes

The creation of a specific missile system with sea-based cruise missiles is determined by the principles of construction, solved goals and tasks. The priority areas for the development of promising missile weapons are factors such as: a combination of small weight and size character-istics of the missile and its area of an effective reflecting surface; optimization of flight altitude at cruise and final sections, at homing of cruise missiles on target; provision of antiosenitic ma-neuver and high speeds of cruise missiles flight to trajectories and much more.

Minimal codewords arising from the incidence of points and hyperplanes in projective spaces

<p style='text-indent:20px;'>Over the past few years, the codes <inline-formula><tex-math id="M1">\begin{document}$ {\mathcal{C}}_{n-1}(n,q) $\end{document}</tex-math></inline-formula> arising from the incidence of points and hyperplanes in the projective space <inline-formula><tex-math id="M2">\begin{document}$ {\rm{PG}}(n,q) $\end{document}</tex-math></inline-formula> attracted a lot of attention. In particular, small weight codewords of <inline-formula><tex-math id="M3">\begin{document}$ {\mathcal{C}}_{n-1}(n,q) $\end{document}</tex-math></inline-formula> are a topic of investigation. The main result of this work states that, if <inline-formula><tex-math id="M4">\begin{document}$ q $\end{document}</tex-math></inline-formula> is large enough and not prime, a codeword having weight smaller than roughly <inline-formula><tex-math id="M5">\begin{document}$ \frac{1}{2^{n-2}}q^{n-1}\sqrt{q} $\end{document}</tex-math></inline-formula> can be written as a linear combination of a few hyperplanes. Consequently, we use this result to provide a graph-theoretical sufficient condition for these codewords of small weight to be minimal.</p>

Miniature high pressure needle valve

A simple and miniature high pressure needle valve has been designed and tested. The valve has shown reliable and stable operation at the temperature range 0–110 °C and pressure up to 30 MPa. This valve design will be useful for devices and setups when small size and small weight are needed.

Outcome of Interventional Cardiac Catheterization in Infants Weighing Less Than 2500 Grams: A Comparative Study

ABSTRACT Objectives: A retrospective study to evaluate the outcome of interventional cardiac catheterization in infants weighing <2500 grams. Background: The mortality of small weight infants undergoing heart surgery remains high, so cardiac catheterization has been utilized to improve the outcome. Methods: The study included infants who underwent interventional cardiac catheterization within the first 60 days of life in New Children Cairo University Hospital, Cairo, Egypt from January 2015 to January 2018. The study group included infants < 2500 grams while the comparative group included infants ≥ 2500 grams. Adverse events were classified according to the mechanism and seriousness. Results: The study group (37 patients) had a mean weight of 2.35 ±0.13 Kg, while the comparative group (164 patients) had a mean weight of 3.54 ±0.71 Kg. The procedures included balloon atrial septostomy, pulmonary balloon valvuloplasty, ductus arteriosus stenting and radiofrequency perforation of pulmonary atresia. The study group showed less success rates as compared with the comparative group (83.8% versus 93.9%, p = 0.04), and higher incidence of overall adverse events (48.6% versus 20.1 %, p<0.001) as well as catheterization-related mortality (29.7% versus 4.9%, P<0.001). In the study group, pulmonary balloon valvuloplasty showed the highest incidence of major adverse events while ductus arteriosus stenting had the highest incidence of mortality. Conclusions: Compared to normal weight infants, interventional cardiac catheterization in small weight infants is associated with lower success and higher morbidity and mortality rates. Pulmonary balloon valvuloplasty and ductus arteriosus stenting have the highest morbidity and mortality, respectively.