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 koristeći koeficijente odrediti početak navodnjavanja, na temelju izračunavanja svakodnevne evapotranspiracije. Koeficijent navodnjavanja predstavlja potrošnju vode (mm) po jednom stupnju srednje temperature zraka (0C). Trogodišnja istraživanja (1999-2000) provedena su u Međimurju, na kulturama: jabuke, šećerne repe i krumpira i na tipu tla semiglej. Navodnjavanje kultura obavljeno je mini rasprskivačima. Obrok navodnjavanja izračunat je standardnom metodom i iznosio je kod jabuke 47,9 mm, a kod šećerne repe i krumpira 36,0 mm. Koeficijent navodnjavanja izračunat je za dekadno razdoblje na temelju sljedećih podataka: vlažnost tla, oborine, srednje dnevne temperature zraka i količina vode dodane navodnjavanjem. Prosječni trogodišnji 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 šećernu 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. Potrošnja vode za pojedini dan može se izračunati množenjem koeficijenta navodnjavanja i srednje dnevne temperature zraka (0C). Kada se zbrajanjem potroši količina vode dodana prethodnim obrokom navodnjavanja, potrebno je ponovno primijeniti navodnjavanje. Određene vrijednosti koeficijenta navodnjavanja mogu se koristiti za određivanje početka navodnjavanja i u širem području s istim ili sličnim pedološkim 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 Međimurje, 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