We assume that product i has a constant hazard of adjusting, fi, in each month, where fi ∼ Beta(a, b). Let us denote the product’s lifetime by ni. These assumptions imply that the total number of price changes in a product’s lifetime is distributed according to the binomial distribution, xi ∼ Bin(ni, fi). We assume, furthermore, that fi is distributed according to the beta distribution, fi ∼ Be...

1. In [3], we have shown that in a finite ZP-group G in which A and B are cyclic and A is its own normalizer, the commutator subgroup T of G is cyclic and G = AT with AC\T= I. This result can be used to determine the structure of arbitrary ZP-groups in which A and B are cyclic. If A is a subgroup of a group G, define the subgroup Ni(A) of G inductively by the formula Ni(A)=No(Ni~1(A)), and deno...

IMAC [ 141 2.1. Pass solubilized material (about 45 ml) at a flow rate of 0.4 ml/min over Ni-NTA resin equilibrated with buffer A. 2.2. Wash Ni-NTA column at a flow rate of 0.4 ml/min with 120 ml of buffer A. 2.3. Elute N T R fusion protein at a flow rate of 0.2ml/min with 80ml of buffer B*. Combine peak fractions (1 3 ml) and add protease inhibitors. Save 1 ml for analysis. 2.4. Dilute remaini...

A Ni-catalyzed reductive coupling of alkynes and epoxides using Ni(II) salts and simple alcohol reducing agents is described. Whereas previously reported conditions relied on Ni(cod)(2) and Et(3)B, this system has several advantages including the use of air-stable and inexpensive Ni(II) precatalysts (e.g., NiBr(2)·3H(2)O) as the source of Ni(0) and simple alcohols (e.g., 2-propanol) as the redu...

We consider the following problem. Let n ≥ 2, b ≥ 1 and q ≥ 2 be integers. Let R and B be two disjoint sets of n red points and bn blue points in the plane, respectively, such that no three points of R∪B lie on the same line. Let n = n1 + n2 + · · · + nq be an integer-partition of n such that 1 ≤ ni for every 1 ≤ i ≤ q. Then we want to partition R∪B into q disjoint subsets P1 ∪P2 ∪ · · · ∪Pq th...

Electromigration in the Ni/Sn-Zn/Cu solder interconnect was studied with an average current density of 3.51 9 10 A/cm for 168.5 h at 150 C. When the electrons flowed from the Ni side to the Cu side, uniform layers of Ni5Zn21 and Cu5Zn8 were formed at the Ni/Sn-Zn and Cu/Sn-Zn interfaces. However, upon reversing the current direction, where electron flow was from the Cu side to the Ni side, a th...

The paper reviews data concerning the involvement of GABA(A) and GABA(B) receptors in the control of GnRH secretion in anestrous ewes. Generally, GABA influences the GnRH release through GABA(A) and GABA(B) receptors located on perikaria of the GnRH neurons in the preoptic area (MPOA) or through the influence on beta-endorphinergic and catecholaminergic systems activity in MPOA and in ventromed...

The structure and thermostability of hyperfine amorphous Ni2B catalysts (HA-Ni2B) have been sttidied by EXAFS, XPD and DSC. The samples prepared by chemical reduction have been proved to be amorphous. The grain size is between 5 nm and 20 nm. A short-range order cluster is formed. The distances of Ni-B or Ni-Ni did not alter due to the change of the conditions but the coordination number of Ni ...