The behaviour of materials in machining - the influence of small tellurium additions on the microstructure and machining behaviour of low carbon free cutting steels
This document provides summaries for several Ukrainian technical regulations and standards that are available for purchase from www.rusgost.com. The summaries include the titles of the documents translated to English, their order numbers, available formats and languages, and a note that prices are available upon request from the website. The document catalogs regulations and standards related to road vehicle stability, road transport vehicle identification signs, pressure measurement terms, physical units, energy consumption calculation methods, and metrology basics.
Понятный и доступный текст, созданный под потребности вашей аудитории - это продавец, который работает круглосуточно. Предлагаю вам возможность создать такого "менеджера" для своего продукта самостоятельно.
Inclusive Business in Tourism_Phinda Case StudyAndrew Rylance
Phinda Private Game Reserve in South Africa represents a partnership model where some land and asset ownership has been transferred to neighboring communities while a private sector partner continues to operate and manage the reserve. This partnership strengthens an inclusive business approach through community employment, sourcing local products and services, and a foundation providing skills training. The model benefits both the luxury tourism business through community support against poaching, and local communities through jobs and annual lease fees totaling around $2.6 million.
This document provides a vitae for Jean Kueker, Professor Emerita in Education. It outlines her educational background, professional experience, interests, memberships, grants, research, publications, presentations, and leadership roles. Key details include that she retired in 2004 after working at various universities, most recently as a professor at Our Lady of the Lake University from 1993-2004. She has since taken on part-time roles teaching online courses. Her areas of expertise include special education, early childhood education, reading, and technology integration.
Designing the virtual model of a mechatronic micro positioning and micro-meas...eSAT Journals
Abstract This paper aims is to present the realization of a virtual model, as well as the experimental model for a mechatronic micro-positioning and micro-measuring system on two axes, OX, and OZ respectively. The paper also includes experimental results on measuring the gripping force developed between the fingers of an electrical micro-gripper, with two fingers, incorporated into the experimental model of a mechatronic micro-positioning system. Index Terms: flexible mechatronic system, micro-positioning, micro-gripper
This document provides summaries for several Ukrainian technical regulations and standards that are available for purchase from www.rusgost.com. The summaries include the titles of the documents translated to English, their order numbers, available formats and languages, and a note that prices are available upon request from the website. The document catalogs regulations and standards related to road vehicle stability, road transport vehicle identification signs, pressure measurement terms, physical units, energy consumption calculation methods, and metrology basics.
Понятный и доступный текст, созданный под потребности вашей аудитории - это продавец, который работает круглосуточно. Предлагаю вам возможность создать такого "менеджера" для своего продукта самостоятельно.
Inclusive Business in Tourism_Phinda Case StudyAndrew Rylance
Phinda Private Game Reserve in South Africa represents a partnership model where some land and asset ownership has been transferred to neighboring communities while a private sector partner continues to operate and manage the reserve. This partnership strengthens an inclusive business approach through community employment, sourcing local products and services, and a foundation providing skills training. The model benefits both the luxury tourism business through community support against poaching, and local communities through jobs and annual lease fees totaling around $2.6 million.
This document provides a vitae for Jean Kueker, Professor Emerita in Education. It outlines her educational background, professional experience, interests, memberships, grants, research, publications, presentations, and leadership roles. Key details include that she retired in 2004 after working at various universities, most recently as a professor at Our Lady of the Lake University from 1993-2004. She has since taken on part-time roles teaching online courses. Her areas of expertise include special education, early childhood education, reading, and technology integration.
Designing the virtual model of a mechatronic micro positioning and micro-meas...eSAT Journals
Abstract This paper aims is to present the realization of a virtual model, as well as the experimental model for a mechatronic micro-positioning and micro-measuring system on two axes, OX, and OZ respectively. The paper also includes experimental results on measuring the gripping force developed between the fingers of an electrical micro-gripper, with two fingers, incorporated into the experimental model of a mechatronic micro-positioning system. Index Terms: flexible mechatronic system, micro-positioning, micro-gripper
The document discusses the technology preferences of several students. Montse enjoys using Facebook to stay connected with friends, while Marcela prefers playing computer games over traditional games. Laura likes watching TV shows on websites. Isabel and Priscila enjoy playing different types of video games on computers and gaming consoles. The others mentioned like viewing videos, movies, Skyping with friends, taking photos, and using Facebook.
The document announces the opening of iHUB, a new 400 square meter coworking space in Chisinau, Moldova that will open on September 22nd. iHUB will provide work rooms, meeting spaces, and a lounge area to support up to 60 local entrepreneurs. The community is the most important part of iHUB and it will focus on supporting entrepreneurs in fintech, health, cleantech, and gaming industries through events like talks, mentoring, hackathons, and workshops on topics such as design, marketing, and growth hacking. iHUB wants community feedback to improve and provides a link to a survey.
This document lists the names and details of various apartment construction projects completed by Sreeja Constructions in Bangalore and Hyderabad between 2009-2016. It provides the names of 27 apartment complexes constructed in locations across Bangalore like Vignan Nagar, Kempanna Main Road, Malleshpalya, Mahadevpura, Uday Nagar, Kasavanahalli Main Road, Marathahalli, Koramangala, Sarjapur Road, Haralur, Shantinagar, Bellandore, Kumaraswamy Layout, Kaggadaspura, Hennur Main Road, HSR Layout, Electronic City, Marathahalli, Arekere, and projects in
John Kenagy at Consumer Centric Health, Models for Change '11HealthInnoventions
The document discusses opportunities in 21st century healthcare to provide more and better care at lower cost. It notes that historically successful mindsets, methods, strategies and structures are not adaptive to new opportunities. It advocates developing new internal adaptive capacity by working close to patients with timely, relevant information linked to action and rapid feedback to continually improve and realign behavior. A case study shows how one clinic dramatically improved diabetic care outcomes by adopting these adaptive principles.
O documento descreve a história, estilos, competições, graduação e benefícios do karatê. O karatê surgiu na Índia há 5 mil anos e se desenvolveu em Okinawa sob influência chinesa e japonesa, se tornando um dos esportes de combate mais praticados mundialmente atualmente.
Владимир Галика, Digital-стратег, расскажет о серых методах продвижения в социальных сетях.
Тезисы доклада:
- спам
- Мотивированный трафик
- Инвайтинг/масфолловинг
- SOCfishing and etc.
- Покупка аккаунтов
- Подмена пабликов
- Хаккинг и другие плохие вещи
- Как это все определить?
Chip flow and notch wear mechanisms during the machining of high austenitic s...Lepuufu
This document discusses notch wear mechanisms during the machining of high austenitic stainless steels. Special step-turning tests were conducted on four stainless steel alloys to study the degree of work hardening ahead of the tool and the side flow of work material at the depth of cut line. Microhardness measurements and SEM analysis showed severe localized shear and chip side flow interacting strongly with the tool, leading to notch wear initiation. Notch wear was found to be most sensitive to cutting parameters for the alloy with the highest nickel content, and increased with feed and depth of cut. Hardness was highest in the side flow region, indicating work hardening affects notch wear progression.
Analytical prediction of flank wear of carbide tools in turning plain carbon ...Lepuufu
The document analyzes flank wear characteristics of tungsten carbide tools when turning plain carbon steels. It finds that flank wear can be described by an equation similar to the one used for crater wear, but with two characteristic lines intersecting at around 1150K. Experiments measuring temperature and stress on the flank wear land support this, finding uniform distributions. The constants in the flank wear equation are affected by abrasives in the steels. Further investigation is needed to fully understand the contribution of abrasion to flank wear.
Wear performance of ceramic cutting tool materials when cutting steelLepuufu
The document summarizes the results of a study that tested the wear performance of various ceramic cutting tool materials when cutting steel. It found that alumina-based materials like alumina-zirconia (F) and alumina in submicron grain toughened by zirconia (G), as well as mixed-based alumina (Z), exhibited the best wear resistance when cutting steel at high speeds up to 11 m/s. These materials demonstrated tool lives between 180-300 seconds at the highest speed tested. In contrast, silicon nitride (S), sintered carbide (C), cubic boron nitride (B), and alumina reinforced with silicon carbide whiskers (W) showed
Tool wear and inclusion behaviour during turning of a calcium treated quenc...Lepuufu
1. The document analyzes tool wear and inclusion behavior during turning of a calcium-treated steel using coated carbide tools.
2. It finds that inclusions like MnS, mixed sulphides (Mn,Ca)S, and duplex calcium aluminates deform significantly in the flow zone near the tool. MnS deforms the most while mixed sulphides deform less.
3. The behavior and deformation of inclusions in the flow zone influences tool wear and formation of protective layers on the tool surface. Certain inclusions like mixed sulphides are more likely to form protective layers due to their deformation characteristics.
Parte 2 relatório do comportamentode usinagem em brocas helicoidais de aço rá...Lepuufu
A empresa anunciou um novo produto revolucionário que usa tecnologia de ponta para fornecer uma experiência aprimorada para os clientes. O produto será lançado no próximo trimestre e espera-se que gere receita significativa. Os investidores estão animados com o potencial do novo produto para impulsionar o crescimento da empresa.
Specific reduction of toxic side effectsof adriamycin by induction of metallo...Lepuufu
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against developing mental illness and improve symptoms for those who already have a condition.
Inclusion modification of steels the theoryLepuufu
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
The document discusses the technology preferences of several students. Montse enjoys using Facebook to stay connected with friends, while Marcela prefers playing computer games over traditional games. Laura likes watching TV shows on websites. Isabel and Priscila enjoy playing different types of video games on computers and gaming consoles. The others mentioned like viewing videos, movies, Skyping with friends, taking photos, and using Facebook.
The document announces the opening of iHUB, a new 400 square meter coworking space in Chisinau, Moldova that will open on September 22nd. iHUB will provide work rooms, meeting spaces, and a lounge area to support up to 60 local entrepreneurs. The community is the most important part of iHUB and it will focus on supporting entrepreneurs in fintech, health, cleantech, and gaming industries through events like talks, mentoring, hackathons, and workshops on topics such as design, marketing, and growth hacking. iHUB wants community feedback to improve and provides a link to a survey.
This document lists the names and details of various apartment construction projects completed by Sreeja Constructions in Bangalore and Hyderabad between 2009-2016. It provides the names of 27 apartment complexes constructed in locations across Bangalore like Vignan Nagar, Kempanna Main Road, Malleshpalya, Mahadevpura, Uday Nagar, Kasavanahalli Main Road, Marathahalli, Koramangala, Sarjapur Road, Haralur, Shantinagar, Bellandore, Kumaraswamy Layout, Kaggadaspura, Hennur Main Road, HSR Layout, Electronic City, Marathahalli, Arekere, and projects in
John Kenagy at Consumer Centric Health, Models for Change '11HealthInnoventions
The document discusses opportunities in 21st century healthcare to provide more and better care at lower cost. It notes that historically successful mindsets, methods, strategies and structures are not adaptive to new opportunities. It advocates developing new internal adaptive capacity by working close to patients with timely, relevant information linked to action and rapid feedback to continually improve and realign behavior. A case study shows how one clinic dramatically improved diabetic care outcomes by adopting these adaptive principles.
O documento descreve a história, estilos, competições, graduação e benefícios do karatê. O karatê surgiu na Índia há 5 mil anos e se desenvolveu em Okinawa sob influência chinesa e japonesa, se tornando um dos esportes de combate mais praticados mundialmente atualmente.
Владимир Галика, Digital-стратег, расскажет о серых методах продвижения в социальных сетях.
Тезисы доклада:
- спам
- Мотивированный трафик
- Инвайтинг/масфолловинг
- SOCfishing and etc.
- Покупка аккаунтов
- Подмена пабликов
- Хаккинг и другие плохие вещи
- Как это все определить?
Chip flow and notch wear mechanisms during the machining of high austenitic s...Lepuufu
This document discusses notch wear mechanisms during the machining of high austenitic stainless steels. Special step-turning tests were conducted on four stainless steel alloys to study the degree of work hardening ahead of the tool and the side flow of work material at the depth of cut line. Microhardness measurements and SEM analysis showed severe localized shear and chip side flow interacting strongly with the tool, leading to notch wear initiation. Notch wear was found to be most sensitive to cutting parameters for the alloy with the highest nickel content, and increased with feed and depth of cut. Hardness was highest in the side flow region, indicating work hardening affects notch wear progression.
Analytical prediction of flank wear of carbide tools in turning plain carbon ...Lepuufu
The document analyzes flank wear characteristics of tungsten carbide tools when turning plain carbon steels. It finds that flank wear can be described by an equation similar to the one used for crater wear, but with two characteristic lines intersecting at around 1150K. Experiments measuring temperature and stress on the flank wear land support this, finding uniform distributions. The constants in the flank wear equation are affected by abrasives in the steels. Further investigation is needed to fully understand the contribution of abrasion to flank wear.
Wear performance of ceramic cutting tool materials when cutting steelLepuufu
The document summarizes the results of a study that tested the wear performance of various ceramic cutting tool materials when cutting steel. It found that alumina-based materials like alumina-zirconia (F) and alumina in submicron grain toughened by zirconia (G), as well as mixed-based alumina (Z), exhibited the best wear resistance when cutting steel at high speeds up to 11 m/s. These materials demonstrated tool lives between 180-300 seconds at the highest speed tested. In contrast, silicon nitride (S), sintered carbide (C), cubic boron nitride (B), and alumina reinforced with silicon carbide whiskers (W) showed
Tool wear and inclusion behaviour during turning of a calcium treated quenc...Lepuufu
1. The document analyzes tool wear and inclusion behavior during turning of a calcium-treated steel using coated carbide tools.
2. It finds that inclusions like MnS, mixed sulphides (Mn,Ca)S, and duplex calcium aluminates deform significantly in the flow zone near the tool. MnS deforms the most while mixed sulphides deform less.
3. The behavior and deformation of inclusions in the flow zone influences tool wear and formation of protective layers on the tool surface. Certain inclusions like mixed sulphides are more likely to form protective layers due to their deformation characteristics.
Parte 2 relatório do comportamentode usinagem em brocas helicoidais de aço rá...Lepuufu
A empresa anunciou um novo produto revolucionário que usa tecnologia de ponta para fornecer uma experiência aprimorada para os clientes. O produto será lançado no próximo trimestre e espera-se que gere receita significativa. Os investidores estão animados com o potencial do novo produto para impulsionar o crescimento da empresa.
Specific reduction of toxic side effectsof adriamycin by induction of metallo...Lepuufu
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against developing mental illness and improve symptoms for those who already have a condition.
Inclusion modification of steels the theoryLepuufu
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
Effect of machining on high strength low-alloy steelsLepuufu
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help boost feelings of calmness, happiness and focus.
Bismuth alloyed steels with improved machinabilityLepuufu
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise boosts blood flow, releases endorphins, and promotes changes in the brain which help enhance one's emotional well-being and mental clarity.
About bismuth in incut 200 a new series of free-machining steelsLepuufu
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
Historical analysis of metal cutting shows that metal removal rates have been increasing in the course of the century, predicated by the advancement in tool materials but the steel design has lagged behind. This paper examines the mechanisms of chip formation and tool wear as a function of cutting speed in metal cutting. Chemical wear is identified as the dominant mechanism of tool wear at high cutting speeds caused by temperature rise due to shear localisation in the primary and secondary shear zones of chip. Shear localisation in the primary shear zone is shown to be influenced by both microstructural parameters, i.e. matrix hardening and second phase particles, and metal cutting variables, i.e. cutting speed (strain rate) and feed (pressure).
Phenomics assisted breeding in crop improvementIshaGoswami9
As the population is increasing and will reach about 9 billion upto 2050. Also due to climate change, it is difficult to meet the food requirement of such a large population. Facing the challenges presented by resource shortages, climate
change, and increasing global population, crop yield and quality need to be improved in a sustainable way over the coming decades. Genetic improvement by breeding is the best way to increase crop productivity. With the rapid progression of functional
genomics, an increasing number of crop genomes have been sequenced and dozens of genes influencing key agronomic traits have been identified. However, current genome sequence information has not been adequately exploited for understanding
the complex characteristics of multiple gene, owing to a lack of crop phenotypic data. Efficient, automatic, and accurate technologies and platforms that can capture phenotypic data that can
be linked to genomics information for crop improvement at all growth stages have become as important as genotyping. Thus,
high-throughput phenotyping has become the major bottleneck restricting crop breeding. Plant phenomics has been defined as the high-throughput, accurate acquisition and analysis of multi-dimensional phenotypes
during crop growing stages at the organism level, including the cell, tissue, organ, individual plant, plot, and field levels. With the rapid development of novel sensors, imaging technology,
and analysis methods, numerous infrastructure platforms have been developed for phenotyping.
ESR spectroscopy in liquid food and beverages.pptxPRIYANKA PATEL
With increasing population, people need to rely on packaged food stuffs. Packaging of food materials requires the preservation of food. There are various methods for the treatment of food to preserve them and irradiation treatment of food is one of them. It is the most common and the most harmless method for the food preservation as it does not alter the necessary micronutrients of food materials. Although irradiated food doesn’t cause any harm to the human health but still the quality assessment of food is required to provide consumers with necessary information about the food. ESR spectroscopy is the most sophisticated way to investigate the quality of the food and the free radicals induced during the processing of the food. ESR spin trapping technique is useful for the detection of highly unstable radicals in the food. The antioxidant capability of liquid food and beverages in mainly performed by spin trapping technique.
The use of Nauplii and metanauplii artemia in aquaculture (brine shrimp).pptxMAGOTI ERNEST
Although Artemia has been known to man for centuries, its use as a food for the culture of larval organisms apparently began only in the 1930s, when several investigators found that it made an excellent food for newly hatched fish larvae (Litvinenko et al., 2023). As aquaculture developed in the 1960s and ‘70s, the use of Artemia also became more widespread, due both to its convenience and to its nutritional value for larval organisms (Arenas-Pardo et al., 2024). The fact that Artemia dormant cysts can be stored for long periods in cans, and then used as an off-the-shelf food requiring only 24 h of incubation makes them the most convenient, least labor-intensive, live food available for aquaculture (Sorgeloos & Roubach, 2021). The nutritional value of Artemia, especially for marine organisms, is not constant, but varies both geographically and temporally. During the last decade, however, both the causes of Artemia nutritional variability and methods to improve poorquality Artemia have been identified (Loufi et al., 2024).
Brine shrimp (Artemia spp.) are used in marine aquaculture worldwide. Annually, more than 2,000 metric tons of dry cysts are used for cultivation of fish, crustacean, and shellfish larva. Brine shrimp are important to aquaculture because newly hatched brine shrimp nauplii (larvae) provide a food source for many fish fry (Mozanzadeh et al., 2021). Culture and harvesting of brine shrimp eggs represents another aspect of the aquaculture industry. Nauplii and metanauplii of Artemia, commonly known as brine shrimp, play a crucial role in aquaculture due to their nutritional value and suitability as live feed for many aquatic species, particularly in larval stages (Sorgeloos & Roubach, 2021).
BREEDING METHODS FOR DISEASE RESISTANCE.pptxRASHMI M G
Plant breeding for disease resistance is a strategy to reduce crop losses caused by disease. Plants have an innate immune system that allows them to recognize pathogens and provide resistance. However, breeding for long-lasting resistance often involves combining multiple resistance genes
Unlocking the mysteries of reproduction: Exploring fecundity and gonadosomati...AbdullaAlAsif1
The pygmy halfbeak Dermogenys colletei, is known for its viviparous nature, this presents an intriguing case of relatively low fecundity, raising questions about potential compensatory reproductive strategies employed by this species. Our study delves into the examination of fecundity and the Gonadosomatic Index (GSI) in the Pygmy Halfbeak, D. colletei (Meisner, 2001), an intriguing viviparous fish indigenous to Sarawak, Borneo. We hypothesize that the Pygmy halfbeak, D. colletei, may exhibit unique reproductive adaptations to offset its low fecundity, thus enhancing its survival and fitness. To address this, we conducted a comprehensive study utilizing 28 mature female specimens of D. colletei, carefully measuring fecundity and GSI to shed light on the reproductive adaptations of this species. Our findings reveal that D. colletei indeed exhibits low fecundity, with a mean of 16.76 ± 2.01, and a mean GSI of 12.83 ± 1.27, providing crucial insights into the reproductive mechanisms at play in this species. These results underscore the existence of unique reproductive strategies in D. colletei, enabling its adaptation and persistence in Borneo's diverse aquatic ecosystems, and call for further ecological research to elucidate these mechanisms. This study lends to a better understanding of viviparous fish in Borneo and contributes to the broader field of aquatic ecology, enhancing our knowledge of species adaptations to unique ecological challenges.
The binding of cosmological structures by massless topological defectsSérgio Sacani
Assuming spherical symmetry and weak field, it is shown that if one solves the Poisson equation or the Einstein field
equations sourced by a topological defect, i.e. a singularity of a very specific form, the result is a localized gravitational
field capable of driving flat rotation (i.e. Keplerian circular orbits at a constant speed for all radii) of test masses on a thin
spherical shell without any underlying mass. Moreover, a large-scale structure which exploits this solution by assembling
concentrically a number of such topological defects can establish a flat stellar or galactic rotation curve, and can also deflect
light in the same manner as an equipotential (isothermal) sphere. Thus, the need for dark matter or modified gravity theory is
mitigated, at least in part.
Or: Beyond linear.
Abstract: Equivariant neural networks are neural networks that incorporate symmetries. The nonlinear activation functions in these networks result in interesting nonlinear equivariant maps between simple representations, and motivate the key player of this talk: piecewise linear representation theory.
Disclaimer: No one is perfect, so please mind that there might be mistakes and typos.
dtubbenhauer@gmail.com
Corrected slides: dtubbenhauer.com/talks.html
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
ANAMOLOUS SECONDARY GROWTH IN DICOT ROOTS.pptxRASHMI M G
Abnormal or anomalous secondary growth in plants. It defines secondary growth as an increase in plant girth due to vascular cambium or cork cambium. Anomalous secondary growth does not follow the normal pattern of a single vascular cambium producing xylem internally and phloem externally.
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...University of Maribor
Slides from:
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Track: Artificial Intelligence
https://www.etran.rs/2024/en/home-english/
Nucleophilic Addition of carbonyl compounds.pptxSSR02
Nucleophilic addition is the most important reaction of carbonyls. Not just aldehydes and ketones, but also carboxylic acid derivatives in general.
Carbonyls undergo addition reactions with a large range of nucleophiles.
Comparing the relative basicity of the nucleophile and the product is extremely helpful in determining how reversible the addition reaction is. Reactions with Grignards and hydrides are irreversible. Reactions with weak bases like halides and carboxylates generally don’t happen.
Electronic effects (inductive effects, electron donation) have a large impact on reactivity.
Large groups adjacent to the carbonyl will slow the rate of reaction.
Neutral nucleophiles can also add to carbonyls, although their additions are generally slower and more reversible. Acid catalysis is sometimes employed to increase the rate of addition.
The debris of the ‘last major merger’ is dynamically youngSérgio Sacani
The Milky Way’s (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the
‘last major merger.’ Hypotheses for the origin of this component include Gaia-Sausage/Enceladus (GSE), where the progenitor
collided with the MW proto-disc 8–11 Gyr ago, and the Virgo Radial Merger (VRM), where the progenitor collided with the
MW disc within the last 3 Gyr. These two scenarios make different predictions about observable structure in local phase space,
because the morphology of debris depends on how long it has had to phase mix. The recently identified phase-space folds in Gaia
DR3 have positive caustic velocities, making them fundamentally different than the phase-mixed chevrons found in simulations
at late times. Roughly 20 per cent of the stars in the prograde local stellar halo are associated with the observed caustics. Based
on a simple phase-mixing model, the observed number of caustics are consistent with a merger that occurred 1–2 Gyr ago.
We also compare the observed phase-space distribution to FIRE-2 Latte simulations of GSE-like mergers, using a quantitative
measurement of phase mixing (2D causticality). The observed local phase-space distribution best matches the simulated data
1–2 Gyr after collision, and certainly not later than 3 Gyr. This is further evidence that the progenitor of the ‘last major merger’
did not collide with the MW proto-disc at early times, as is thought for the GSE, but instead collided with the MW disc within
the last few Gyr, consistent with the body of work surrounding the VRM.