Layer contour characterization in additive manufacturing through image binarization

On-Machine Measurement adoption will be key to dimensional and geometrical improvement of additively manufactured parts. One possible approach based on OMM aims at using digital images of manufactured layers to characterize actual contour deviations with respect to their theoretical profile. This strategy would also allow for in-process corrective actions. This work describes a layer-contour characterization procedure based on binarization of digital images acquired with a flat-bed scanner. This procedure has been tested off-line to evaluate the influence of two of the parameters for image treatment, the median filter size (S f ) and the threshold value (T), on the dimensional/geometrical reliability of the contour characterization. Results showed that an appropriate selection of configuration parameters allowed to characterize the proposed test-target with excellent coverage and reasonable accuracy.

Analyses of Li-Rich Minerals Using Handheld LIBS Tool

Lithium (Li) is one of the latest metals to be added to the list of critical materials in Europe and, thus, lithium exploration in Europe has become a necessity to guarantee its mid- to long-term stable supply. Laser-induced breakdown spectroscopy (LIBS) is a powerful analysis technique that allows for simultaneous multi-elemental analysis with an excellent coverage of light elements (Z < 13). This data paper provides more than 4000 LIBS spectra obtained using a handheld LIBS tool on approximately 140 Li-content materials (minerals, powder pellets, and rocks) and their Li concentrations. The high resolution of the spectrometers combined with the low detection limits for light elements make the LIBS technique a powerful option to detect Li and trace elements of first interest, such as Be, Cs, F, and Rb. The LIBS spectra dataset combined with the Li content dataset can be used to obtain quantitative estimation of Li in Li-rich matrices. This paper can be utilized as technical and spectroscopic support for Li detection in the field using a portable LIBS instrument.

Digital Resources: Dark Tourism in Latin America

Participation in tourism has dramatically increased since the mid-20th century. Yet travel to destinations associated with death, disaster, and destruction have long fascinated people. This subgroup of tourism, known as dark tourism, however, has only received popular and scholarly attention from travel enthusiasts, media, and academics since the turn of the century. The website Dark Tourism is a digital resource that introduces the concept and practice of dark tourism to a wider audience. The digital resource delivers well-curated and researched information on dark tourism and boasts excellent coverage of a range of categories, news, and topics with a primary focus on destinations across the globe (including almost 900 places in 112 countries). In particular, the site curates significant content on Latin America (Mexico, Central America, the Caribbean, and South America) and is home to numerous entries on sites including sensationalized tragedies and crimes, natural disasters, and politically tinged sites of genocide and state terrorism. The digital resource is a good reference point to begin critical, historical, and ethical conversations about how to visit sites of death, destruction, and disaster in the region.

Kamala Markandaya’s Bombay Tiger: The Representation of Socio-Cultural Life

This paper is an attempt to study the representation of socio-cultural life in Kamala Markandaya’s Bombay Tiger. Being a leading post-independent Indian novelist, Kamala Markandaya has candidly portrayed Indian social, cultural and political life through her novels. She has rightly reflected these aspects in the work Bombay Tiger. Her description of various aspects and dimensions of cultural life is not imaginary and based on some literature, but it is based on carefully observed traditions and depicted cultural values and ideas. Soon after the death of Kamala Markandaya her daughter Kim Oliver found a typewritten copy of her novel and it was published posthumously with the title ‘Bombay Tiger’ in 2008. Charles R. Larson, one of the close friends of Markandaya and Professor of Literature, American University, Washington, DC has written an introduction to novel Bombay Tiger (2008) where he writes: Reading Bombay Tiger twenty years after Kamala Markandaya began writing the novel is a kind of revelation – especially for what it says about contemporary India” (Larson xii). Although Markandaya lived in abroad she kept in touch with the India. She actively read English newspapers which provided excellent coverage of occurrences in the commonwealth in general and India in particular. It has been rightly said that Kamala Markandaya’s “Sense of India was always extraordinarily vivid, filled with rich vitality, and imaginative in the way of all great writers (and especially novelists) who have been connected to place (Larson xii).

Discovering Open Access Engineering Journals

This study examines the indexing of open access journals in the engineering disciplines. The sample used in this study was generated from a title listing pulled from the Directory of Open Access Journals (DOAJ) in late 2013. Indexing data from four prominent commercial databases in the discipline, Compendex, Web of Science, Inspec, and Scopus, were gathered in late 2017. The four-year interval was a critical component to the methodology, in that it provided sufficient time for these open journals to establish themselves in the research marketplace and earn the attention of leading indexers. The study found that while no single database provided excellent coverage of the open access content, in aggregate, the four databases indexed journals currently listed by the DOAJ reasonably well. The study also found that the four commercial databases indexed current DOAJ content at a much higher rate than content that was no longer listed in the DOAJ.

Uso de tecnología HSPA (HSPA +) y su evolución con la generación de los celulares

La necesidad la tecnología HSPA+ or Evolved High Speed Packet Access también es conocido como HSPA evolution, surgió con la creciente utilización de los datos y los usuarios que desean velocidades de descarga mucho más eficiente, en Ecuador CNT para el 2014 se propuso implementar 491 radio bases HSPA+ para alcanzar una cobertura del 84 por ciento de la población ecuatoriana y desde entonces ha alcanzado una excelente cobertura a nivel nacional. El objetivo de este trabajo es realizar un análisis de la tecnología HSPA +, así como también su evolución a partir de la generación de los celulares, en la segunda etapa se hablará de HSPA sus ventajas, arquitectura de red, estructura de protocolos en la cual se verá la capa MAC y la capa RLC, en la tercera etapa HSDPA su arquitectura de red, sus principales mejoras, estructura de protocolos, handover en HSDPA, en la cuarta etapa HSUPA su arquitectura de red, estructura de protocolos, sus principales mejoras, sus canales y handover HSUPA, en la etapa 5 hablaremos la evolución de HSPA + dentro del release 7.AbstractThe need for HSPA + technology or Evolved High Speed Packet Access is also known as HSPA evolution, emerged with the growing use of data and users wanting download speeds much more efficient, in Ecuador CNT for 2014 set out to implement 491 radio bases HSPA + to reach coverage of 84 percent of the Ecuadorian population and since then reaching an excellent coverage at the national level. The objective of this work is to perform an analysis of the HSPA + technology, as well as its evolution from the generation of the cellular, in the second stage we will talk about HSPA its advantages, network architecture, structure of protocols in which we will see The MAC layer and the RLC layer, in the third stage HSDPA its network architecture, its main improvements, protocol structure, handover in HSDPA, in the fourth stage HSUPA its network architecture, protocol structure, its main improvements, its channels And handover HSUPA, in stage 5 we will discuss the evolution of HSPA + within release 7

The marine sedimentary nitrogen isotope record

A global database of nitrogen isotope data from marine sediments is presented, including both seafloor and sub-seafloor sediment samples. The data synthesis reveals regionally and globally consistent patterns and trends, with good agreement between neighbouring seafloor sites. The spatial coverage of seafloor δ15N data is heterogenous, with excellent coverage in the eastern tropical Pacific, South China Sea and Arabian Sea, while large regions of the globe remain unsampled. The sub-seafloor δ15N records are mostly from the late Pleistocene, with >90 coeval records during the last ~10 kiloyears (kyr), before which the number of records at any time decreases, with <10 coeval records at any time prior to 300 kyr. There is a good correlation between seafloor and shallow-subseafloor δ15N measurements within a 100 km radius, which suggest a reliable translation of sediments into the buried sediment record. We suggest that regional discrepancies between seafloor and late Holocene subseafloor δ15N indicate nitrogen cycle changes during the late Holocene period, rather than systematic diagenetic changes.

Botrytis cinerea control on Sauvignon blanc using a recycling sprayer

The New Zealand wine industry is strongly committed to sustainable production The SprayPro Rseries sprayer is designed to recycle unused chemical sprays not deposited on the target area Sauvignon blanc vines in Marlborough New Zealand were studied during 2011/2012 The vineyard area was 5 ha at 80 flowering where the full canopy was sprayed and 10 ha at pre bunch closure (PBC) targeting the fruiting zone only Disease control efficacy of spray recycling was investigated using Botrytis cinerea as the model pathogen Pathogen colonisation of necrotic leaf discs placed in the canopy at 80 flowering and PBC showed even control of B cinerea At PBC 80 of the watersensitive papers had adequate to excellent coverage Botrytis bunch rot incidence and severity were evenly expressed throughout the block but increased during preharvest; severity was well below the 3 economic threshold Recycling of botryticides did not affect disease control

Helpful Hints from The New York Times

As readers of MPPA editorials may know, I often rely on the excellent coverage of medical and scientific news in The New York Times for source material as well as to read “all the news that’s fit to print.” In the course of my daily reading, a nonmedical or scientific news item from the Associated Press on March 24, 2004, piqued my musical interest. Coming from Bonn, Germany, it concerned violinists in the orchestra there who were striking for extra pay, contending they deserved it because they played many more notes than musicians in other sections.