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Blog de Luis Mochán.

Blog de Luis Mochán del Instituto de Ciencias Físicas.

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Luis Mochán
mochan@fis.unam.mx
GPG id: DD344B85
Fingerprint: 2ADC B65A 5499 C2D3 4A3B 93F3 AE20 0F5E DD34 4B85

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Cambio de presidencia en el Campus Morelos de la UNAM
Desde ayer dejé de ser presidente del Consejo de Dirección del Campus Morelos de la UNAM. El nuevo presidente es el Dr. David Romero Camarena, director del Centro de Ciencias Genómicas (CCG).

Cargado a las 23:10 en /mochan/varios / campus20100117, | Etiquetas: campus morelos, unam | liga permanente

Another reason not to use Microsoft
Some info about the recent attack on Google exploiting the vulnerabilities of Internet Explorer from Microsoft. The malware code has now become public.

Cargado a las 22:13 en /mochan/varios / ie20100117, | Etiquetas: internet explorer, microsoft, network | liga permanente

Non-local derivation of Poynting's theorem
My paper with Rubén Barrera was accepted in Physica B. In it we discuss an expression for Poynting's vector within non-local media. We find that besides ExB, there is a contribution -ExM to the energy flow (as is well known) but it originates in the non-locality of the dielectric response within true magnetic materials, and also within dielectric metamaterials or colloids whose non-local response mimics an effective magnetic contribution. We obtain further corrections useful for transverse and for longitudinal fields.

Cargado a las 17:13 en /mochan/noticiasFisica / poynting20100117, | Etiquetas: colloids, electrodynamics, metamaterials, papers, Poynting | liga permanente

Evidence Based Medicine

Reading about kyphoplasty and the evidence in favor or against it, I read the terms evidence based medicine. Its existence implies that most of the medical treatments in use are not evidence based, i.e., based on statistical analysis of many cases with appropriate controls, double blind tests, etc. In the case of kyphoplasty and vertebroplasty, after 25 years of use, there are only two double blind studies with about 130 patients with negative results. The results have been contested but the criticisms, although reasonable (there was a pre-selection of cases, all interventions were performed by the same surgeon, the amount of cement was inadequate) have not reached yet refereed medical journals. (My mother is having kyphoplasty next week).

Most medical doctors draw upon their (limited) personal experience and reported clinical cases, they are not trained statisticians and, in any case, they don't have access to massive data banks to perform data analysis. Thus, I suggest that, if it doesn't exist yet, a single database should be set up to attempt to collect information from all cases attended by all physicians world-wide, so that a data mining program might find enough evidence about a given treatment in given circumstances that conclusions can be drawn with some certainty. It should be simple to use, so that physicians are encouraged to use it. Maybe it can offer to be a substitute to paper files, so that information about given individuals may be obtained using the appropriate passwords, replacing in-office files and motivating physicians to use it. Maybe it should also allow patients to fill their own cases and to retrieve them when required, making their clinical history available to the doctor of their choice. Anybody else should then be able to obtain and analyze information that doesn't compromises the anonymity of doctors and patients.

Cargado a las 13:23 en /mochan/varios / evidence20100117, | Etiquetas: medicine, science | liga permanente

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