Measured lifetime data for the 2s2 S0–2s2p P1 resonance and intercombination lines in the Be isoelectronic sequence are critically evaluated, and jointly systematized using effective singlet–triplet-reduced line strengths Sr. The data are examined together with recent theoretical predictions in the linearizing exposition ZSr ∼= SH+B/(Z−C) and the high-Z trend is compared with the corresponding ...

Abstract. Aerosol mixing state regulates the interactions between water molecules and particles thus controls aerosol activation hygroscopic growth, which thereby influences visibility degradation, cloud formation, its radiative forcing. There are, however, few current studies on structure effects hygroscopicity. Here, we investigated hygroscopicity of ammonium sulfate / phthalic acid (AS PA) w...

Low-cost and easily accessible sludge treatment technologies are necessary in low- middle-income countries. This study aimed to evaluate the use of Moringa oleifera seed powder (MO) as a natural conditioner for supernatant quality improvement prior thickening result gravity settling. The zone settling rate (ZSR) volume index (SVI) were used capacity. Supernatant clarification was evaluated term...

The volatile and hygroscopic properties of ammonium sulphate seeded and unseeded secondary organic aerosol (SOA) derived from the photo-oxidation of atmospherically relevant concentrations of α-pinene were studied. The seed particles were electrospray generated ammonium sulphate ((NH4)2SO4) having diameters of approximately 33 nm with a quasi-mono-disperse size distribution (geometric standard ...

This study setout to investigate the effect of wheat residue, tillage, and nitrogen fertilizer management on some agronomic traits of soybean as a split split plot based on randomized complete block design with three replications. The main plots included wheat residue management: collecting and leaving residue and sub plot included tillage (without tillage and conventional tillage), and the sub...

leaving crop residues on the soil surface may significantly affect the behavior and activity of herbicides. in order to study the effect of wheat residue and different rates of trifluralin (%48 ec) herbicide on the yield and oil content of sunflower (helianthus annuus) a field experiment was done in agricultural research station, the university of birjand in summer 2008. experimental design was...

this study setout to investigate the effect of wheat residue, tillage, and nitrogen fertilizer management on some agronomic traits of soybean as a split split plot based on randomized complete block design with three replications. the main plots included wheat residue management: collecting and leaving residue and sub plot included tillage (without tillage and conventional tillage), and the sub...

For infinitely many primes p = 4k+1 we give a slightly improved upper bound for the maximal cardinality of a set B ⊂ Zp such that the difference set B−B contains only quadratic residues. Namely, instead of the ”trivial” bound |B| ≤ √p we prove |B| ≤ √ p − 1, under suitable conditions on p. The new bound is valid for approximately three quarters of the primes p = 4k + 1.

introduction integrated nutrient management involving crop residue/green manures and chemical fertilizer is potential alternative to provide a balanced supply of nutrients, enhance soil quality and thereby sustain higher productivity. the present experiment was undertaken to evaluate the effect of different crop residue management practices and npk levels on yield components and yield of wheat....