227 research outputs found
Effects of hydrogen upon the properties of thermo mechanical controlled process (TMCP) steel
Research into the effects of hydrogen on the mechanical properties of the material is wide-ranging and time-consuming, since there is no single way of predicting cold cracking that would be applicable to all steel grades. Some research on the action of hydrogen in the weld area has focused on the effects of filler materials, welding parameters, the welding environment and welding process upon the hydrogen content of the weld metal and final effect of the hydrogen content upon the properties of the material
Unconventional spin density wave in Bechgaard salt (TMTSF)2NO3
Among many Bechgaard salts, TMTSF2NO3 exhibits very anomalous low temperature
properties. Unlike conventional spin density wave (SDW), TMTSF2NO3 undergoes
the SDW transition at \T_SDW\approx 9.5 K and the low temperature
quasiparticle excitations are gapless. Also, it is known that TMTSF2NO3 does
not exhibit superconductivity even under pressure, while FISDW is found in
TMTSF2NO3 only for P=8.5 kbar and B>20 T. Here we shall show that both the
angle dependent magnetoresistance data and the nonlinear Hall resistance of
TMTSF2NO3 at ambient pressure are interpreted satisfactory in terms of
unconventional spin density wave (USDW). Based on these facts, we propose a new
phase diagram for Bechgaards salts.Comment: 4 pages, 4 figs, RevTe
Remaining life determination for pressure vessel in a refinery
Repair and inspection has been performed on a pressure vessel in the oil refinery for downstream treatment of crude oil in Iraq, without technical documentation. Two different approaches have given totally different results for further operation of the vessel. One option is to put the vessel out of service, while the other is to keep the vessel in operation. The remaining life is determined in accordance with API standards
Remaining life determination for pressure vessel in a refinery
Repair and inspection has been performed on a pressure vessel in the oil refinery for downstream treatment of crude oil in Iraq, without technical documentation. Two different approaches have given totally different results for further operation of the vessel. One option is to put the vessel out of service, while the other is to keep the vessel in operation. The remaining life is determined in accordance with API standards
WATER DOSAGE USING THE COEFFICIENT OF IRRIGATION
Cilj istraživanja je bio utvrditi koeficijente navodnjavanja, a zatim koristeÄi koeficijente odrediti poÄetak navodnjavanja, na temelju izraÄunavanja svakodnevne evapotranspiracije. Koeficijent navodnjavanja predstavlja potroÅ”nju vode (mm) po jednom stupnju srednje temperature zraka (0C). TrogodiÅ”nja istraživanja (1999-2000) provedena su u MeÄimurju, na kulturama: jabuke, Å”eÄerne repe i krumpira i na tipu tla semiglej. Navodnjavanje kultura obavljeno je mini rasprskivaÄima. Obrok navodnjavanja izraÄunat je standardnom metodom i iznosio je kod jabuke 47,9 mm, a kod Å”eÄerne repe i krumpira 36,0 mm. Koeficijent navodnjavanja izraÄunat je za dekadno razdoblje na temelju sljedeÄih podataka: vlažnost tla, oborine, srednje dnevne temperature zraka i koliÄina vode dodane navodnjavanjem.
ProsjeÄni trogodiÅ”nji koeficijent navodnjavanja za jabuku se kretao od 0,16 mm/0C u prvoj dekadi svibnja do 0,40 mm/0C u prvoj dekadi kolovoza, za Å”eÄernu repu od 0,10 mm/0C u prvoj dekadi svibnja do 0,23 mm/0C u drugoj dekadi srpnja i za krumpir od 0,11 mm/0C u prvoj dekadi svibnja do 0,21 mm/0C u drugoj dekadi srpnja.
PotroÅ”nja vode za pojedini dan može se izraÄunati množenjem koeficijenta navodnjavanja i srednje dnevne temperature zraka (0C). Kada se zbrajanjem potroÅ”i koliÄina vode dodana prethodnim obrokom navodnjavanja, potrebno je ponovno primijeniti navodnjavanje.
OdreÄene vrijednosti koeficijenta navodnjavanja mogu se koristiti za odreÄivanje poÄetka navodnjavanja i u Å”irem podruÄju s istim ili sliÄnim pedoloÅ”kim i klimatskim uvjetima.The goal of the investigations was to determine the onset of irrigation using the coefficient of irrigation, which is based on the calculation of everyday evapotranspiration. The coefficient of irrigation represents the water consumption (mm) per one degree of mean daily air temperature (oC). Three-year investigations (1999-2001) were carried out in MeÄimurje, on the soil type Calcaric Fluvisol (Anthrosol). Irrigation was applied by means of mini sprinklers. Irrigation rate was calculated by the standard method and amounted to 47.9 mm apple, 36.0 mm for sugarbeet and potato. The coefficient of irrigation was estimated for ten-day periods (decades) according to the data on: soil moisture, precipitation, mean daily air temperature and the amount of water added with irrigation.
The average three-year coefficient of irrigation ranged for apple from 0.16 mm/oC in the first decade of May to 0.40 mm/oC in the first decade of August, sugarbeet from 0.10 mm/oC in the first decade of May to 0.23 mm/oC in the second decade of August and for potato from 0.11 mm/oC in the first decade of May to 0.21 mm/oC in the second decade of July. Water consumption for a particular day is calculated by multiplying the coefficient of irrigation by the mean daily air temperature (oC). When, in adding up the consumption of water per days, the previously added irrigation rate is spent, irrigation should be applied again.
This practical procedure of determining the onset of irrigation can also be applied in crop production also in a wider area with equal or similar pedological and climatic conditions
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