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- Ismail S Al-Nashar, Ricardo Luis Carrau, Alfredo Herrera, Carl H. Snyderman
- The Laryngoscope
- 2004

OBJECTIVES
Lesions affecting the lateral recess of the sphenoid sinus are rarely discussed in the literature as a separate entity. This region is difficult to visualize and manipulate through the transnasal routes, especially when extensive pneumatization is present. External approaches to this area involve extensive surgery and are associated with… (More)

- Nandinii Barbosa, Cendejas, Alfredo Herrera, Aguilar
- 2006

We generate scalar thick brane configurations in a 5D Riemannian space time which describes gravity coupled to a self–interacting scalar field. We also show that 4D gravity can be localized on a thick brane which does not necessarily respect Z2–symmetry, generalizing several previous models based on the Randall–Sundrum system and avoiding the restriction to… (More)

- Santiago Restrepo, Felipe Martinez, Alfredo Herrera, Enrique Palacios
- Ear, nose, & throat journal
- 2004

- Alfredo Herrera, Oleg Kechkin
- 1996

The Ernst–like matrix representation of the multidimensional Einstein–Kalb– Ramond theory is developed and the O(d,d)–symmetry is presented in the matrix–valued SL(2, R)–form. The analogy with the Einstein and Einstein– Maxwell–Dilaton–Axion theories is discussed. PACS numbers: 04.20.Jb, 04.50.+h Typeset using REVTEX 1

Disease caused by Rhizoctonia solani Kühn infestations has become a growing problem for commercially important crops. Although this fungus is usually controlled through the application of chemicals, the heavy ecological and fi nancial toll of the latter has prompted for research on biopesticides as a viable alternative. Trichoderma spp. is a well-known… (More)

- Alfredo Herrera, Thomas A A Prowse
- 2015 IEEE 9th International Conference on…
- 2015

IEEE has been developing organizational capability to create open source innovations for humanitarian needs since the 2004 Tsunami. In 2009, IEEE held the Humanitarian Technology Challenge (HTC); where one of the stated objectives was that the results would be broadly available to anyone for their use in providing humanitarian products or services. Since… (More)

- Nandinii Barbosa, Cendejas, Alfredo Herrera, Aguilar
- 2008

We consider the generation of thick brane configurations in a pure geometric Weyl integrable 5D space time which constitutes a non–Riemannian generalization of Kaluza–Klein (KK) theory. In this framework, we show how 4D gravity can be localized on a scalar thick brane which does not necessarily respect reflection symmetry, generalizing in this way several… (More)

- Alfredo Herrera, Oleg Kechkin
- 1996

The (3+d)–dimensional Einstein–Kalb–Ramond theory reduced to two dimensions is considered. It is shown that the theory allows two different Ernst– like d × d matrix formulations: the real non–dualized target space and the Hermitian dualized non–target space ones. The O(d, d) symmetry is written in a SL(2, R) matrix–valued form in both cases. The… (More)

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