This paper is concerned with the periodic solutions for a class of new Nicholson-type delay system with nonlinear density-dependent mortality terms. By using coincidence degree theory, some criteria are obtained to guarantee the existence of positive periodic solutions of the model. Moreover, an example is employed to illustrate the main results.

T. NICHOLSON-ROBERTS, T. FLETCHER, P. REES, S. DICKSON, D. HINSLEY, M. BAILEY, L. LAMB and C. ARDLEY From the Neurosciences Intensive Care Unit, Wessex Neurological Centre, University Hospital Southampton, Southampton SO16 6YD, UK and Academic Department of Military Medicine, Royal Centre for Defence Medicine (Academia and Research), Medical Directorate, Joint Medical Command, ICT Centre, Birmi...

T. Nicholson,1,∗ M. Sambridge2 and Ó. Gudmundsson3 1Research School of Earth Sciences, Australian National University, Canberra ACT 0200, Australia. E-mail: [email protected] 2Center for Advanced Data Inference, Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia. E-mail: [email protected] 3Danish Lithospheric Centre, Øster Voldgade 10, 1350...

Jean Clark, President, IFHRO Josephine Raw, Australia Lili Levesque, Canada Liu Aimin, China Darley Petersen, Denmark Angelika Haendel, Germany Gemala Hatta, Indonesia Avni Pnini, Israel Sara Marchisio, Italy Janice Bryan, Jamaica Yukiko Yokobori, Japan Robert Wamalwa, Kenya Nam Kim, Korea Lourdes Palapal, The Phillipines Lorraine Nicholson, UK, President-Elect Margaret Skurka, USA Bryon Pickar...

Effective Responses with Appropriate Stimulation in vitro Lindsay Nicholson, MD; Harsh Pratap, MS; Elisabeth Bowers, PhD; Edward M. Gardner, MD; Timothy Wright,; Edward Janoff, MD; Internal Medicine/ Infectious Diseases, University of Colorado Denver, Aurora, CO; Infectious Diseases, University of Colorado Denver, Aurora, CO; University of Colorado Denver, Aurora, CO; Denver Health and Hospital...

T. Nicholson,1 Ó. Gudmundsson2 and M. Sambridge3 1Research School of Earth Sciences, Australian National University, Canberra ACT 0200, Australia. E-mail: [email protected] 2Danish Lithospheric Centre, Øster Voldgade 20, 1350 Copenhagen K, Denmark. E-mail: [email protected] 3Centre for Advanced Data Inference, Research School of Earth Sciences, Australian National University, Canberra ACT 0200, A...

Michele Barbato, A.M.ASCE; and Joel P. Conte, M.ASCE Assistant Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ. and A&M College, 3418H Patrick F. Taylor Hall, Nicholson Extension, Baton Rouge, LA 70803. E-mail: mbarbato@lsu. edu Professor, Dept. of Structural Engineering, Univ. of California at San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0085 (corresponding auth...