[en] The design of an altazimuth mounting was presented in response to the need to provide researchers at the Centro de Investigaciones Espaciales (CINESPA) with the necessary tools to carry out research in the field of astrophysics. The atmospheric, seismic and geographical conditions were taken into account to define the application requirements. The Sun's relative movement to Earth and its nature in the radio spectrum were studied. The possibility of reusing the previous frame was evaluated. A systemic design approach was developed to explore various solutions, in order to determine an option that would involve less investment, greater ease of construction and installation, without compromising functionality. The detailed design and selection were made with only limited mechanical components. The design of a completely new frame was made due to the complexity of reusing the previous frame. The mechanical details for the construction of the design were presented

[en] Previous reviews have include prostate, breast, bladder and colon cancer and lymphoma among the causes of a super bone scan but have not included stomach cancer. We report a 58 year-old female with an infiltrative gastric adenocarcinoma extended to the minor curvature and posterior side of fundus. Bone scintigraphy showed diffuse increased uptake typical of a 'superscan' indicating bone metastases diffusely invading the bone marrow. Gastric carcinoma should be considered in the differential diagnosis of a 'superscan' pattern (Au)

[en] Highlights: • We evaluate the impact of daylight saving time on electricity consumption in Mexico. • We use a differences-in-differences econometric approach to evaluate DST. • Our data covers a large period both before and after DST started in Mexico. • Residential savings due to DST represent 0.5% of total electricity consumption. • Savings are larger towards the end of the DST period. -- Abstract: Since the First World War, several countries use daylight saving time (DST). However, evaluations of DST started until the 1970s. Given the difficulties of finding data around the moment in which DST started, econometric studies usually evaluate changes to DST. We have aggregate data on residential electricity consumption in Mexico from 1982 to 2016. DST started in 1996. Therefore, our data covers a large period both before and after DST started. Moreover, DST is in effect only during part of the year (from April to October). Hence, we can evaluate the effects of DST with a differences-in-differences (DID) econometric approach. As far as we know, there is only another DID econometric study using similar data. Such study takes advantage of a short period in which DST was adopted and then repealed in Australia. Since our data covers a larger period, we can control for trends in consumption, calculate savings in different DST months, and run robustness tests. Our estimates indicate that savings due to DST account for 0.5% of total electricity consumption. Nevertheless, the effect of DST is not homogeneous along the period. This is important because estimates based on DST extensions may not reflect the effects of DST itself.

[en] Very few papers have assessed Bone scan (BS) in patients with fibromyalgia syndrome (FS) The aim of this study is to assess BS value in patients with FS trying to find a possible BS pattern to help in the diagnose of this pathology, as happens in other rheumatic pathologies, helping also in the differential diagnose. 19 women (age 24-69 years) have been studied. 14 of them had a clinical diagnosis of FS and 5 clinical suspicion. All were performed a great number of diagnostic tests: laboratory blood tests, X-rays, electrocardiography, electro encephalography, electromyography, ultrasonography, computerized tomography, magnetic resonance imaging and BS. All BS showed abnormal polyarticular hyperuptake foci with variable degrees with a diffuse or punctual location. Blood pool scintigraphies were negative despite clinical examination was positive. There was no relationship between the location and intensity of hyper uptake foci and clinical existence of pain. We think that patients with FS could present a variable poly articular scintigraphic pattern in location and hyper uptake foci degree (Au)

[en] Highlights: • Tectonics is important in the land-use planning of tectonically active regions. • The characterization of the physical environment requires comprehensive studies. • Geology allows knowing the distribution of natural hazards in the land. • Tectonics can be used to define homogeneous environmental units. In this research, emphasis is placed on the information and diagnostic phase of the physical environment for land-use planning (LUP). Our work is mainly focused on a land-planning case study of a tectonic depression, the Tulum Valley, which extends into the Pampean flat-slab segment. We propose the use of tectonic structures to define Environment Units (EUs) as necessary boundaries for the LUP. For this purpose, we have studied tectonic structures using geophysical methods and, subsequently, subjected multiple dimensions of the physical environment in the territory to an exhaustive analysis. Moreover, we have examined the influence of structural geology on water, soils, processes, materials and forms in the landscape. The study revealed the close and significant relationship between the different elements of the physical environment observable on the surface (shape, distribution, appearance, degree of development) and the tectonic structures, which supported the use of this criterion to define EUs. In order to test it, we applied the same methodology in another area of South America, the city of Bucaramanga, where it was possible to define EUs based on tectonics and to also establish comparisons. The methodology proposed for the diagnostic phase based mainly on the tectonic factor represents a challenge as regards its application in other active tectonic zones. Some limitations could arise such as fragmented environmental information from different institutions or the small to non-existent number of tectonic studies available. As a strong point, we find that the method allows achieving a comprehensive study of the environmental setting and thus to propose activities and land uses in each EU according to the real reception capacity of the land. This exhaustive analysis of the physical environment will also help decision-makers to understand and manage the socio-natural risks of the territory where communities develop.