Strange particle production in pp annihilations at 8.8 GeV/c

Results are presented from an experiment at the SLAC 40″ hybrid facility (SHF) using an 8.8 GeV/c antiproton beam. Using external detectors and an on-line trigger, a sample of events enriched in $\text{p}$p annihilations was obtained. pp interactions taken under the same conditions enabled the annihilations to be identified. Cross sections and distributions for the inclusive production of K_s⁰ and K^1±(890), and cross sections for exclusive channels with a pair of strange particles are presented.     

Surface area development of three cokes in relation to the zinc–lead blast furnace

The development of surface area on burn-off for three metallurgical cokes has been studied and correlated with rates of oxidation in carbon dioxide. The role of boric oxide, B₂O₃, as inhibitor of oxidation is discussed. The effect of ash build-up in the later stages of coke burn-off is evaluated in relation to surface area changes.     

Frequency optimized potential energy functions for the ground-state surfaces of HCN and HCP

Potential energy functions for the ground states of the linear triatomics HCN, HNC ($\text{X}\text{?}{}^1\text{Σ}{}^{\mathrm{+}}$) and HCP ($\text{X}\text{?}{}^1\text{Σ}{}^{\mathrm{+}}$) were derived, by minimizing the difference between the observed vibrational frequencies and those calculated from the potentials by a variational method. Good agreement is obtained between the observed and calculated spectra for HCN and HNC. For the HCP system, a secondary minimum is predicted to lie on the ground-state surface (linear HPC) having dimensions $\text{R}{}_{\mathrm{<mtext>HP</mtext>}}\text{= 1.43}\text{A}\text{?}$, $\text{R}{}_{\mathrm{<mtext>CP</mtext>}}\text{= 1.56}\text{A}\text{?}$, and an energy of 3.8 eV above the HCP ($\text{X}\text{?}{}^1\text{Σ}{}^{\mathrm{+}}$) minimum.     

A novel site of adult doublecortin expression: neuropeptide neurons within the suprachiasmatic nucleus circadian clock

Background  

The mammalian suprachiasmatic nucleus (SCN) is composed of heterogeneous sub-groups of neurons that are organized into a neural system for the control of circadian physiology and behaviour. Molecular circadian 'clocks' are not an exclusive property of SCN neurons but the unique role of the SCN as a central integrative pacemaker is associated with specialized aspects of neuronal organization. Current studies are aimed at identifying the functional components of this hypothalamic integrative centre.     

Search for rare and forbidden Charm Meson decays D0 --> Vl+l- and hhll

We report results of a search for flavor-changing neutral current (FCNC), lepton flavor, and lepton-number violating decays of the D0 (and its antiparticle) into three and four bodies. Using data from Fermilab charm hadroproduction experiment E791, we examine modes with two leptons (muons or electrons) and a rho(0), K( *0), or straight phi vector meson or a nonresonant pi(pi), Kpi, or KK pair of pseudoscalar mesons. No evidence for any of these decays is found. Therefore, we present branching-fraction upper limits at 90% confidence level for the 27 decay modes examined (18 new).     

Non-aqueous capillary electrophoresis of tamoxifen and its acid hydrolysis products

Tamoxifen and its acid hydrolysis products were separated and tentatively identified by non-aqueous capillary electrophoresis with thermooptical absorbance and electrospray ionization mass spectrometry. Acid hydrolysis is a convenient method of generating tamoxifen degradation products. The parent compound and seven hydrolysis products were separated in 9 min.     

Coupling of mixed finite elements and boundary elements

The symmetric coupling of mixed finite element and boundaryelement methods is analysed for a model interface problem withthe Laplacian. The coupling involves a further continuous ansatzfunction on the interface to link the discontinuous displacementfield to the necessarily continuous boundary ansatz function.Quasi-optimal a priori error estimates and sharp a posteriorierror estimates are established which justify adaptive mesh-refiningalgorithms. Numerical experiments prove the adaptive couplingas an efficient tool for the numerical treatment of transmissionproblems.     

A note on maximizing the permanent of a positive definite hermitian matrix,given the eigenvalues ∗

As a step toward understanding the unsolved problem of determining how large the permanent of a positive semi-definite matrix can be, given the eigenvalues, we note that a necessary condition for A to be a permanent maximizing matrix is that A commute with its permanental adjoint.