Measurement of the branching fraction, and bounds on the CP-violating asymmetries, of neutral B decays to D*+/- D-/+.

We present measurements of the branching fraction and CP-violating asymmetries for neutral B decays to D(*+/-)D-/+. The measurement uses a data sample of approximately 88x10(6) Upsilon(4S)-->BBmacr; decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy e(+)-e(-) collider. By fully reconstructing the D(*+/-)D-/+ decay products, we measure the branching fraction to be (8.

Study of the rare decays B0-->D((*)+)(s)pi(-) and B0-->D((*)-)(s)K+.

We report evidence for the decays B0-->D(+)(s)pi(-) and B0-->D(-)(s)K+ and the results of a search for B0-->D(*+)(s)pi(-) and B0-->D(*-)(s)K+ in a sample of 84 x 10(6) upsilon(4S) decays into BB pairs collected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) storage ring. We measure the branching fractions B(B0-->D(+)(s)pi(-))=[3.2+/-0.

Measurement of the Cabibbo-Kobayashi-Maskawa matrix element V(ub) with B-->rhoenu decays.

We present a measurement of the branching fraction for the rare decays B-->rhoenu and extract a value for the magnitude of V(ub), one of the smallest elements of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix. The results are given for five different calculations of form factors used to para-metrize the hadronic current in semileptonic decays. Using a sample of 55 x 10(6) BB meson pairs recorded with the BABAR detector at the PEP-II e(+)e(-) storage ring, we obtain B(B0-->rho(-)e(+)nu)=(3.

Factors influencing contraceptive use in Tehran.

Background: Despite reluctance to conceive, approximately 30% of couples do not use any method of contraception. Health concerns, side effects, failure of the method and some demographic issues such as education, age, residential region and number of living children have a major effect on contraceptive use.

Objective: The aim of the present study was to determine those factors which influence contraceptive use in Tehran.

A model study of periodic breathing, stability of the neonatal respiratory system, and causes of sudden infant death syndrome.

A mathematical model of the neonatal respiratory system has been modified and used to examine the system under various physiological conditions at different stages of maturity. The respiratory responses in hypoxia, periodic breathing and following a sign have been analyzed. The effects of different respiratory parameters on the stability of the system for normal and premature infants have been investigated.

A feedback controller for supplemental oxygen treatment of newborn infants: a simulation study.

A microcomputer control system has been developed for supplemental oxygen therapy of newborn infants. The system uses feedback of arterial oxygen saturation to adjust the concentration of oxygen in the incubator or under the hood. The control system has been tested under different physiological conditions, using a detailed simulation model of the neonatal respiratory system.

Mathematical analysis and computer simulation of the respiratory system in the newborn infant.

A mathematical model of neonatal respiratory control is proposed which can be used to stimulate the system under different physiological conditions. The model consists of a continuous plant and a discrete controller. Included in the plant are lungs, body tissue, brain tissue, a cerebrospinal fluid compartment, and central and peripheral receptors.

A microcomputer oxygen control system for ventilatory therapy.

A computer-based feedback system has been developed to adjust the concentration of oxygen in the inspired gas of a patient under artificial respiration. The system uses a proportional plus integral controller and feedback of arterial oxygen saturation to adjust the inspired oxygen fraction. The effectiveness of the controller has been tested using a dynamic, mathematical model of the human respiratory system.

A mathematical model of the human respiratory system.

A model of the human respiratory system is proposed which has a satisfactory performance under different physiological conditions. The model comprises a continuous plant and a discrete controller which generates and updates the drive signal to the plant at the end of every breath to represent the Hering-Breuer reflex. Arterial and central medullary sensors are included.

On the regulation of cardiac output and cerebral blood flow.

Algebraic presentations are used to describe the steady-state relationships for cardiac output and cerebral blood flow in terms of arterial blood levels of oxygen and carbon dioxide and the metabolic rate ratio. A possible application of the results is briefly discussed with regard to their use in modelling of the respiratory control system.

Adjuvant tamoxifen therapy for early breast cancer: an experimental study with reference to oestrogen and progesterone receptors.

There is very little known about the subsequent behavior of breast cancer following adjuvant endocrine therapy or the effect of this therapy on the oestrogen and progesterone receptor content of recurrent disease. Mammary tumours were induced in Sprague-Dawley rats using N-nitrosomethylurea. In two experiments animals were treated with tamoxifen at different doses prior to the appearance of tumours.