La ganadería ante escenarios complejos.

La calidad de las contribuciones, producto de la pluma de especialistas en los temas tratados, el presente es un libro que esperamos, basándonos en la importancia de los temas tratados, sea de utilidad y abone a la reflexión de los estudiosos de la ganadería mexicana y, por supuesto, en beneficio de las familias ganaderas y de los consumidores de sus productos.este libro refleja en muchos sentidos la situación de la ganadería mexicana, a la que se le están demandando mayor producción y productividad, que los procesos productivos tengan la menor huella ecológicposible, que los alimentos sean inocuos, que se abatan costos de producción y, cada vez aumentan las presiones de diversos grupos para, que se incluyan los protocolos de bienestar animal, solamente por citar algunos de los retos que tiene. Algunas de estas demandas son complementarias, otras se contraponen, lo que hace valiosos a los estudios que desde las ciencias sociales se realizan y, desde diversas ópticas, se hagan propuestas de política pública balanceadas que consideren lo mejor de cada enfoque, pero sin desechar por completo los antagónicos.Universidad Autónoma Chaping

Sobre la termodinámica y la física estadística relativistas y radiación de fondo

Orthogonal frequency division multiplexing (OFDM) is a multicarrier transmission scheme and has been widely used in communication systems due to the advantages like simpler equalization, flexible signal arrangement and so on. Also, wireless communication can provide high data speed in cellular systems, which makes internet connection via mobile and other user equipment the primary approach in daily life. The existing long term evolution (LTE) and fourth-generation (4G) systems use OFDM as a downlink scheme and provide very high peak data speed. However, the development of user equipment (UEs) operating with high data rates and the continuously growing number of users creates needs for more features and high capacities for wireless communications. For meeting the needs of the latest and future applications, fifth-generation (5G) technologies are under intensive research and development, while the first phase of 5G is actively deployed by the operators. Those technologies aim to reduce the latency, reduce power consumption, improve the throughput and support more users. In addition, the usage of 5G technologies can be categorized into three branches: enhanced mobile broadband (eMBB), ultra reliable low latency communication (URLLC) and massive machine type communication (mMTC). Because of the high spectral efficiency and other advantages of OFDM, it is still seen as a suitable modulation technique for 5G wireless communication applications. The most common OFDM scheme is CP-OFDM, which can cancel inter symbol interference (ISI) and ease the equalization process. However, the use of cyclic prefix (CP) introduces overheads which reduce the spectral efficiency and increase power consumption and latency. To meet the requirements of low latency and spectral efficiency in 5G New Radio (5G NR) applications, avoiding the usage of CP would be an interesting possibility if it could be done without severe drawbacks. This thesis provides one novel CP-free method called modified CP-free OFDM which can be used in 5G single input single output (SISO) communication. Comparing with existing CP-free designs, it does not require complex equalization algorithms or extra procedures for receivers’ detection process. Also, it can achieve similar performance with conventional CP-OFDM with minor modifications on the receiver side with respect to basic CP-OFDM receiver. In the experiment part of the thesis, the modified CP-free OFDM was tested under TDD SISO communication scenarios with line-of-sight (LOS) and non-line-of-sight (NLOS) channel models, considering both, normal and pre-equalized configurations. Simulations are used to evaluate different variants of the scheme regarding the three main performance aspects: bit-error-rate (BER), peak-to-average power ratio (PAPR), and power spectral density (PSD) of the transmitted signal

On a Self-Consistency Thermodynamical Criterion for Equations of the State of Gases in Relativistic Frames

More than three decades ago, Tykodi and Hummel proposed a procedure to investigate the self-consistency thermodynamical criterion for equations of the state of gases. The main criterion used by these authors consists of requiring that an equation of state must not be inconsistent with certain thermodynamical identities from the first and second laws of thermodynamics. This paper explores the possibility of another self-consistency method based on relativistic transformations of the thermodynamical variables. It is shown that the virial coefficients have to be corrected by a relativistic factor if the equation of state is considered in a moving relativistic reference frame. Some relativistic and non-relativistic equations of state are analyzed

Mercados y tianguis en el siglo XXI. Repensando sus problemáticas

Los capítulos que conforman esta obra se acercan a los mercados y tianguis principalmente desde las ciencias sociales, económicas y biológicas. Sin embargo, a diferencia de estudios realizados en décadas pasadas, han encontrado nuevas problemáticas, como, por ejemplo, la relación clientelar de locatarios y tianguistas con agrupaciones mayores y partidos políticos. También se describe la disputa del mercado entre personas locales y turistas, es decir, los problemas que emergen de la museificación de estos espacios. Además, el tema de los supermercados, espacios que han ganado terreno, actualmente no deben disociarse de las lógicas comerciales de consumo.En el mundo globalizado en que vivimos, los mercados y tianguis se enfrentan a procesos de adaptación social, cultural, política y económica. Existen prácticas que continúan mientras que, a la par, aparecen nuevas formas de relacionarse con estos espacios. Por ello, los compiladores del libro, así como las y los especialistas que escriben en él, invitamos a la comunidad lectora a que utilice este libro como un referente que puede ayudarle a descubrir su propio lente para mirar a los mercados y tianguis y, al mismo tiempo, le sirva para reflexionar sobre el papel del consumo en nuestras vidas cotidianas.Universidad Autónoma del Estado de Méxic

Demographic, clinical, and functional determinants of antithrombotic treatment in patients with nonvalvular atrial fibrillation

Altres ajuts: Alliance Bristol-Myers Squibb/Pfizer.Background: This study assessed the sociodemographic, functional, and clinical determinants of antithrombotic treatment in patients with nonvalvular atrial fibrillation (NVAF) attended in the internal medicine setting. Methods: A multicenter, cross-sectional study was conducted in NVAF patients who attended internal medicine departments for either a routine visit (outpatients) or hospitalization (inpatients). Results: A total of 961 patients were evaluated. Their antithrombotic management included: no treatment (4.7%), vitamin K antagonists (VKAs) (59.6%), direct oral anticoagulants (DOACs) (21.6%), antiplatelets (6.6%), and antiplatelets plus anticoagulants (7.5%). Permanent NVAF and congestive heart failure were associated with preferential use of oral anticoagulation over antiplatelets, while intermediate-to high-mortality risk according to the PROFUND index was associated with a higher likelihood of using antiplatelet therapy instead of oral anticoagulation. Longer disease duration and institutionalization were identified as determinants of VKA use over DOACs. Female gender, higher education, and having suffered a stroke determined a preferential use of DOACs. Conclusions: This real-world study showed that most elderly NVAF patients received oral anticoagulation, mainly VKAs, while DOACs remained underused. Antiplatelets were still offered to a proportion of patients. Longer duration of NVAF and institutionalization were identified as determinants of VKA use over DOACs. A poor prognosis according to the PROFUND index was identified as a factor preventing the use of oral anticoagulation