Effect of a Temperature Mode of Radiation-thermal Sintering the Structure and Magnetic Properties of Mn-Zn-ferrites

2000NM Mn-Zn-ferrites have been produced by radiation-thermal sintering (RTS). We have studied the effect of RTS on the electromagnetic properties of ferrites. X-ray diffraction have been used to investigate general aspects of phase transformations during the radiation-thermal sintering of green compacts

Effect of a Temperature Mode of Radiation-thermal Sintering the Structure and Magnetic Properties of Mn-Zn-ferrites

2000NM Mn-Zn-ferrites have been produced by radiation-thermal sintering (RTS). We have studied the effect of RTS on the electromagnetic properties of ferrites. X-ray diffraction have been used to investigate general aspects of phase transformations during the radiation-thermal sintering of green compacts

Limits on the production of scalar leptoquarks from Z (0) decays at LEP

A search has been made for pairs and for single production of scalar leptoquarks of the first and second generations using a data sample of 392000 Z0 decays from the DELPHI detector at LEP 1. No signal was found and limits on the leptoquark mass, production cross section and branching ratio were set. A mass limit at 95% confidence level of 45.5 GeV/c2 was obtained for leptoquark pair production. The search for the production of a single leptoquark probed the mass region above this limit and its results exclude first and second generation leptoquarks D0 with masses below 65 GeV/c2 and 73 GeV/c2 respectively, at 95% confidence level, assuming that the D0lq Yukawa coupling alpha(lambda) is equal to the electromagnetic one. An upper limit is also given on the coupling alpha(lambda) as a function of the leptoquark mass m(D0)

Obtaining of Nanostructured Powders of Barium and Strontium Hexaferrite by the Polymer Precursor Method

Studied the possibility of obtaining by precursors in the polymer nanostructured powders of barium hexaferrite BaFe12O19 and strontium hexaferrite SrFe12O19. The reagents were used as starting barium nitrate, strontium nitrate and ferric nitrate nonahydrate (III), and polyethylene glycol-400 used this technology as a polymer

EXPERIENCE OF USING MICROSOFT VIRTUALIZATION IN IT ENVIRONMENT OF UNIVERSITY

It is shown that server’s Virtualization and consolidation of virtual machines on a few of physical servers increases efficiency of capital investments for University in an equipment with the simultaneous increase of availability of resources, reducing downtimeand and after emergency renewal of virtual servers. Universities are faced with a necessity to consolidate present informative resources and all of necessary network infrastructure, which are often created with the use of licensed facilities and products of opened kodas, on a minimum number of physical servers. The authors carried out the transfer of a few physical servers was executed in a virtual environment, utillizing different facilities of virtualizacii of company Maykrosoft, that defined, except for obvious advantages, and a number of limitations with which it is possible to clash in the process of such transfer of the applied servers. We consider free virtualization tools – Virtual PC 2007, Windows 7 – XP Mode, Virtual Server 2005, Hyper-V Server 2008R2, and paid virtualization tool – Windows Server 2008R2 with role Hyper-V installed

Laparoscopic diagnosis and treatment of early adhesive small bowel obstruction after gynecological surgery

It is presented the results of diagnostic and curative laparoscopic interventions in 33 patients with acute early adhesive small bowel obstruction. Ileus developed after surgical treatment (laparotomy) of different gynecological diseases. Laparoscopy appeared as the most informative diagnostic method to confirm diagnosis in all patients, to estimate state of abdominal cavity and small pelvis organs what can help to determine method of surgical treatment. Contraindications for laparoscopic surgery were identified in 12 (36.4%) patients and conversion to laparotomy was applied in this group. Postoperative complications were diagnosed in 1 (8.3%) patient. 2 (16.6%) patients died. Early adhesive ileus was resolved laparoscopically in 21 (63.6%) of 33 patients. Recurrent acute early adhesive ileus was detected in 1 (4.7%) patient

Scanning thermal microscopy with heat conductive nanowire probes

Scanning thermal microscopy (SThM), which enables measurement of thermal transport and temperature distribution in devices and materials with nanoscale resolution is rapidly becoming a key approach in resolving heat dissipation problems in modern processors and assisting development of new thermoelectric materials. In SThM, the self-heating thermal sensor contacts the sample allowing studying of the temperature distribution and heat transport in nanoscaled materials and devices. The main factors that limit the resolution and sensitivities of SThM measurements are the low efficiency of thermal coupling and the lateral dimensions of the probed area of the surface studied. The thermal conductivity of the sample plays a key role in the sensitivity of SThM measurements. During the SThM measurements of the areas with higher thermal conductivity the heat flux via SThM probe is increased compared to the areas with lower thermal conductivity. For optimal SThM measurements of interfaces between low and high thermal conductivity materials, well defined nanoscale probes with high thermal conductivity at the probe apex are required to achieve a higher quality of the probe-sample thermal contact while preserving the lateral resolution of the system. In this paper, we consider a SThM approach that can help address these complex problems by using high thermal conductivity nanowires (NW) attached to a tip apex. We propose analytical models of such NW-SThM probes and analyse the influence of the contact resistance between the SThM probe and the sample studied. The latter becomes particularly important when both tip and sample surface have high thermal conductivities. These models were complemented by finite element analysis simulations and experimental tests using prototype probe where a multiwall carbon nanotube (MWCNT) is exploited as an excellent example of a high thermal conductivity NW. These results elucidate critical relationships between the performance of the SThM probe on one hand and thermal conductivity, geometry of the probe and its components on the other. As such, they provide a pathway for optimizing current SThM for nanothermal studies of high thermal conductivity materials. Comparison between experimental and modeling results allows us to provide direct estimates of the contact thermal resistances for various interfaces such as MWCNT-Al (5×10−9±1×10−9 K m2 W−1), Si3N4–Al (6×10−8±2.5×10−8 K m2 W−1) and Si3N4−graphene (~10−8 K m2 W−1). It was also demonstrated that the contact between the MWCNT probe and Al is relatively perfect, with a minimal contact resistance. In contrast, the thermal resistance between a standard Si3N4 SThM probe and Al is an order of magnitude higher than reported in the literature, suggesting that the contact between these materials may have a multi-asperity nature that can significantly degrade the contact resistance

Laparoscopic diagnosis and treatment of early adhesive small bowel obstruction after gynecological surgery

It is presented the results of diagnostic and curative laparoscopic interventions in 33 patients with acute early adhesive small bowel obstruction. Ileus developed after surgical treatment (laparotomy) of different gynecological diseases. Laparoscopy appeared as the most informative diagnostic method to confirm diagnosis in all patients, to estimate state of abdominal cavity and small pelvis organs what can help to determine method of surgical treatment. Contraindications for laparoscopic surgery were identified in 12 (36.4%) patients and conversion to laparotomy was applied in this group. Postoperative complications were diagnosed in 1 (8.3%) patient. 2 (16.6%) patients died. Early adhesive ileus was resolved laparoscopically in 21 (63.6%) of 33 patients. Recurrent acute early adhesive ileus was detected in 1 (4.7%) patient