An Array-Type System Applied to Complex Surfaces in Nuclear Pollution Detection

[EN] Radioactive pollution detection plays a key role in nuclear technology application. In this paper, an array-type of nuclear pollution detection system is designed for the detection scenario of complex surfaces. Firstly, to get the three-dimensional point cloud of the surface, a complex surface was modeled based on the geometric ranging model of a two-dimensional laser profilometer and the motion model of a two-degree-of-freedom displacement platform. Secondly, an 'S' type scanning scheme of profilometer was developed to overcome the problem of limited scanning area of the profilometer. Thirdly, Euclidean distance weighted median filtering was used to solve the impulsive noise that may occur during the point cloud acquisition process. Finally, the 3D point cloud information of the complex surface was used for controlling the movement of the 6 x 6 array channel pollution detector to complete the alpha and beta particle measurement tasks. A mechanical platform was constructed for experiments, the results are as follows. The working range of this system is from -5 cm to 5 cm in elevation difference of surfaces, and the accuracy is 12 mu m in surface height measuring. It takes 26.13 s to perform a detection task including surface scanning and the detector moving, and scanning accuracy is 0.35 x 0.35 mm(2). The maximum control error of the surface contamination detector is 0.4 mm. Specifically, the detection area of the system reaches 240 x 240 mm(2). The results show that the system acquires three-dimensional terrain information, and realizes control over the movement of the pollution detector accurately and then completes the detection of alpha and beta particles effectively.This work is supported by National Natural Science Foundation (NSFC) of China under Grant No.61601382, Sichuan Provincial Science and Technology Support Project No.2019YJ0325, the Doctoral Fund of Southwest University of Science and Technology No.16zx7148, No.19zx7123, Longshan academic talent research supporting program of SWUST No.18LZX632 and the Fund of Robot Technology Used for Special Environment Key Laboratory of Sichuan Province No.13zxtk08.Chu, H.; Chang, Z.; Shao, Y.; Zhang, X.; Lloret, J. (2020). An Array-Type System Applied to Complex Surfaces in Nuclear Pollution Detection. Electronics. 9(11):1-21. https://doi.org/10.3390/electronics9111870S12191

Gelation of Arabinoxylans from Maize Wastewater — Effect of Alkaline Hydrolysis Conditions on the Gel Rheology and Microstructure

The purpose of this research was to extract arabinoxylans (AX) from maize wastewater generated under different maize nixtamalization conditions and to investigate the polysaccharide gelling capability, as well as the rheological and microstructural characteristics of the gels formed. The nixtamalization conditions were 1.5 hours of cooking and 24 hours of alkaline hydrolysis (AX1) or 30 minutes cooking and 4 hours of alkaline hydrolysis (AX2). AX1 and AX2 presented yield values of 0.9% and 0.5% (w/v), respectively. Both AX samples presented similar molecular identity (Fourier Transform Infra-Red) and molecular weight distribution but different ferulic acid (FA) content. AX1 and AX2 presented gelling capability under laccase exposure. The kinetics of gelation of both AX samples was rheologically monitored by small amplitude oscillatory shear. The gelation profiles followed a characteristic kinetics with an initial increase in the storage modulus (G\u27) and loss modulus (G") followed by a plateau region for both gels. AX1 presented higher G\u27 than AX2. In scanning electron microscopy (SEM) images, both gels present an irregular honeycomb microstructure. The lower FA content in AX2 form gels presenting minor elasticity values and a more fragmented microstructure. These results indicate that nixtamalization process conditions can modify the characteristics of AX gels

Therapeutic Issues in Relapsing Enterococcus faecalis Endocarditis.

We have read with great interest the article by Daneels et al., which analyzes the treatment approach and risk of relapse in a large cohort of patients with definite Enterococcus faecalis endocarditis (EFIE). Although relatively less serious than endocarditis caused by other microorganisms, EFIE is fearsome due to the high risk of relapse

Production and temperature sensitivity of long chain alkenones in the cultured haptophyte Pseudoisochrysis paradoxa

The alkenone unsaturation index (U<sub>37</sub><sup>K</sup> or U<sub>37</sub><sup>K′</sup>) serves as a critical tool for reconstructing temperature in marine environments. Lacustrine haptophyte algae are genetically distinct from their ubiquitous and well studied marine counterparts, and the unknown species-specific genetic imprints on long chain alkenone production by lacustrine species have hindered the widespread application of the U37<sup>K</sup> temperature proxy to lake sediment records. The haptophyte Pseudoisochrysis paradoxa produces alkenones but its U37<sup>K</sup> calibration has never been determined. It has an alkenone fingerprint abundant in tetraunsaturated alkenones, a hallmark of lacustrine environments. We present here the first calibration of the U37<sup>K</sup> index to temperature for a culture of P. paradoxa. We found that the U37<sup>K</sup> index accurately captured the alkenone response to temperature whereas the U37<sup>K′</sup> index failed to do so, with U37<sup>K′</sup> values below 0.08 projecting to two different temperature values. Our results add a fifth species-specific U37<sup>K</sup> calibration and provide another line of evidence that different haptophyte species require different U37<sup>K</sup> calibrations. The findings also highlight the necessary inclusion of the C<sub>37:4</sub> alkenone when reconstructing temperatures from P. paradoxa-derived alkenone records

El proceso de producción y su efecto en los resultados económicos y financieros de la curtiembre J&B SAC en la ciudad de Trujillo año 2014

El presente trabajo de investigación, consiste en conocer los efectos del proceso de producción en los resultados económicos y financieros de la Curtiembre J&B SAC. El problema planteado para la investigación fue: ¿Cuál es el efecto del proceso de producción en los resultados económicos y financieros de la curtiembre J&B SAC año 2014? Y cuya hipótesis fue: El proceso de producción tiene efecto positivo en los resultados económicos y financieros de la curtiembre J&B SAC. de Trujillo Año 2014. La población y muestra de la Curtiembre J&B SAC está conformada por todo el personal que trabaja actualmente en la empresa. El diseño de investigación fue no experimental de corte transversal identificando los problemas que presenta el proceso productivo a través de la matriz FODA y un cuestionario aplicado a los trabajadores de la empresa durante sus horas laborables, los resultados demuestran como los procesos actuales generan demoras como pasa con impregnación a paleta y pintado a paleta La conclusión a la que se llegó es que un cambio en el proceso de producción debe ser bien analizado y estudiado ya que esto influye altamente en los resultados económicos y financieros de la empresa. En el caso de la curtiembre la propuesta va a influir para que los resultados de la empresa sean positivos.The present research is to know the effects of the production process in the economic and financial results of the Tannery J & B SAC. The problem posed for the research was: What is the effect of the production process in the economic and financial results of the tannery SAC J & B 2014? And whose hypothesis it was: The production process has a positive effect on the economic and financial results of the tannery J & B SAC. Trujillo Year 2014. The sample population of J & B SAC Tannery was made up all the staff working in the company. The research design was not experimental cross section identifying the problems in the production process through the SWOT matrix and a questionnaire administered to company employees during their working hours, the results show how current processes generate delays as it happens with impregnation with palette and painted palette The conclusion was reached is that a change in the production process should be well analyzed and studied as this highly influences the economic and financial results of the company. In the case of tannery proposal that will influence the company's results are positive.Tesi

A Bubbling Nearby Molecular Cloud: COMPLETE Shells in Perseus

We present a study on the shells (and bubbles) in the Perseus molecular cloud using the COMPLETE survey large-scale 12CO(1-0) and 13CO(1-0) maps. The twelve shells reported here are spread throughout most of the Perseus cloud and have circular or arc-like morphologies with a range in radius of about 0.1 to 3 pc. Most of them have not been detected before most likely as maps of the region lacked the coverage and resolution needed to distinguish them. The majority of the shells are coincident with infrared nebulosity of similar shape and have a candidate powering source near the center. We suggest they are formed by the interaction of spherical or very wide-angle winds powered by young stars inside or near the Perseus molecular cloud -a cloud that is commonly considered to be mostly forming low-mass stars. Two of the twelve shells are powered by high-mass stars close to the cloud, while the others appear to be powered by low or intermediate mass stars in the cloud. We argue that winds with a mass loss rate of about 10^-8 to 10^-6 M_sun/yr are required to produce the observed shells. Our estimates indicate that the energy input rate from these stellar winds is similar to the turbulence dissipation rate. We conclude that in Perseus the total energy input from both collimated protostellar outflows and powerful spherical winds from young stars is sufficient to maintain the turbulence in the molecular cloud. Large scale molecular line and IR continuum maps of a sample of clouds will help determine the frequency of this phenomenon in other star forming regions.Comment: 48 pages in total: 16 pages of text and references; 2 pages of tables; 30 figures (one page per figure). Accepted for publication in the Astrophysical Journa

A Novel Pectin Material: Extraction, Characterization and Gelling Properties

A novel pectin was acid extracted from chickpea husk (CHP). CHP presented a 67% (w/w) of galacturonic acid, an intrinsic viscosity of 374 mL/g and a viscosimetric molecular weight of 110 kDa. Fourier transform infrared spectroscopy spectrum of CHP indicated a degree of esterification of about 10%. The CHP-calcium system formed ionic gels with a storage (G′) modulus of 40 Pa and gel set time (G′ > G″) of 3 min at 1% (w/v), and a G′ of 131 Pa and gel set time of 1 min at 2% (w/v). The G′ of CHP gels was not greatly affected by temperature. The results attained suggest that chickpea husk can be a potential source of a gelling pectin material