20 research outputs found
Generation by Sections and k-Ampleness
Get PDFIn the article “Submanifold of abelian varieties”, A.J. Sommese proved that direct sum and tensor product of two vector bundles E and F over a smooth projective variety are k-ample if E and F are k-ample and are generated by global sections. Here we show that the latter condition is not needed
A General Vanishing Theorem
Get PDFLet E be a vector bundle and L be a line bundle over a smooth projective variety X. In this article, we give a condition for the vanishing of Dolbeault cohomology groups of the form H^p,q (X, S^α E ⊗ (∧^β)E ⊗ L) when S^(α+β)E ⊗ L is ample. This condition is shown to be invariant under the interchange of p and q. The optimality of this condition is discussed for some parameter values
Vanishing theorems for vector bundles generated by sections
No full textIn this article we give a vanishing result for the cohomology groups Hp,q(X,Š E⊗ L), where E is a vector bundle generated by sections and L is an ample line bundle on a smooth projective variety X. We also give an application related to a result of Barth-Lefschetz type. A general nonvanishing result under the same hypothesis is given to prove the optimality of the vanishing result for some parameter values
Ximal degeneracy loci and the secant vector bundle
No full textThis article does not have an abstract
Effect of moisture and bale type on alfalfa hay quality and digestibility
Get PDFThird cutting alfalfa was baled in large rectangular bales (1,400 to 1,800 lb)
and in small conventional bales (70 to 90 lb) at three moisture levels: low 00%),
medium (16%), and high (22%). During 120 days of storage under a roof, the high
moisture, large bales heated the most, reaching 1280 F by 2 days post-baling in a
first peak and 133 ̊F in a second peak by the 11th day. Moderate heating occurred
in the high moisture, small bales (l08° F) and medium moisture, large bales (103 ̊F).
Only the high moisture bales, either small or large, had significant dry matter loss
during storage. Also, heating decreased water soluble carbohydrates and increased
the concentration of cell wall contents by the end of storage. A three-period
collection and digestion trial with lambs showed higher voluntary intakes of small
bale hays than of large bale hays and higher intakes of high moisture hays than of
low moisture hays. Also, the dry matter and crude protein digestibilities were
lowest for the high moisture, large bales. Storing alfalfa hay in large bales at 22%
moisture resulted in extensive heating, which increased storage loss and decreased
nutrient content and digestibility
Additive-treated corn and forage sorghum silages for growing cattle
Get PDFWhole-plant corn silages were treated with Ecosyl® or Foraform® in one trial and
Biomate® or Biomate + Cold-flo® in the second trial. In both trials, the silages were well
preserved, but all were highly unstable in air during the first 3 to 4 weeks of the feed-out
period. Foraform-treated silage was 2 to 6 degrees F cooler than its control, but Cold-flo-treated
silage was 2 to 8 degrees F warmer during the first 10 days post-filling. Laboratory
silo results showed that both control silages fermented extremely fast; however, inoculated
silages had slightly lower pH and higher lactic acid values through the first 4 to 7 days postfilling.
Foraform lowered the initial pH of the ensiled material, restricted subsequent
fermentation, and produced a silage with about one-half the acid content compared to its
control. Cold-flo raised the initial pH and delayed the start of fermentation, but resulted in a
silage with greater acid content and an increased dry matter loss. Though not significant, calves
fed Ecosyl, Foraform, and Biomate silages had about 6 percent better feed conversion than
those fed control silages and gain per ton of crop ensiled was also higher for the three treated
silages. Cold-flo-treated silage produced 3.5 lb less gain per ton of crop ensiled than its control.
Whole-plant forage sorghums were treated with TriLac® in one trial and Silagest® in
the second trial. Inoculated silages had slightly lower ensiling temperatures than controls. All
silages fermented rapidly, but both inoculants increased ensiling efficiency as indicated by higher
lactic to acetic acid ratios (in laboratory silos) and decreased dry matter losses (in farm-scale
silos). Calves fed Silagest silage outperformed those fed control silages, and both inoculants
increased gain per ton of crop ensiled over control silages
Effect of moisture level and bale size on alfalfa hay quality
Get PDFThird cutting alfalfa was baled in large I-ton rectangular bales and in small
conventional bales at three moisture levels, low (10%), medium (16%), and high
(22%). During 120 days of storage under a roof, the high-moisture, large bales
heated the most, reaching 128 ̊ F by 2 days post baling in a first peak and 133 ̊F
in a second peak by the 11 th day. Moderate heating occurred in the high-moisture,
small bales (l08° F) and medium-moisture, large bales(103 ̊F). Only the
high-moisture, small and large bales had significant loss of dry matter during
storage. Also, heating decreased the water soluble carbohydrate and increased the
concentration of cell wall contents by the 120th day of storage. A three-period
collection and digestion trial with lambs showed higher voluntary intakes of
small-bale hays than of large-bale hays and higher intakes of high-moisture hays
than of low-moisture hays. Also, the dry matter and crude protein digestibilities
were lowest for the high-moisture, large bale hay. These data indicate that baling
alfalfa hay in large bales at 22% moisture results in extensive heating, which
negatively affects storage loss, nutrient content, and digestibility
