- Видео 18
- Просмотров 19 200
Video Abstracts
Добавлен 17 окт 2012
Видео
Changes in DNA Methylation of Salt-Treated Brassica rapa
Просмотров 2769 лет назад
Epigenetic modifications are an organism’s way of altering expression of specific genes in response to environmental stress. The most prevalent type of epigenetic modification is DNA methylation, the presence or absence of methyl groups on the cytosines of genes, which is especially common in plants compared to other eukaryotes. This study tested the epigenetic response of the Brassica rapa pla...
Genetic Variation v. Environmental Contaminants in Striped Bass in the Anacostia River
Просмотров 249 лет назад
Video uploaded from my mobile phone.
Changes in DNA Methylation of Salt-Treated Brassica rapa
Просмотров 519 лет назад
This study tested the epigenetic response of the Brassica rapa gene BrERF4 to salt. Results showed a correlation between salt and DNA methylation, suggesting increased expression of the gene, which codes for stress response. Epigenetic modifications can help to solve crop failure.
Genetic Variation v. Environmental Contaminants in Striped Bass in the Anacostia River
Просмотров 249 лет назад
Endocrine disrupting chemicals (EDCs) not only affect the water quality but also the organisms in the river. Bass fish have been found to be particularly sensitive to EDCs, leading to fish kills along the east coast shore of the US. Studies have hinted at the culprit ultimately being fragmented habitats. This study focuses on mutations in aromatase B, a gene that converts androgen to estrogen i...
Using Omni Wheels to Produce Holonomic Movement
Просмотров 2,2 тыс.10 лет назад
This project was submitted to the DC STEM Fair, where it won an honorable mention in the engineering category as well as special awards from Lockheed Martin and the CIA. It was presented with the abstract given below. In general, vehicles can move in two ways, along the forward-backward axis (x-axis) and by rotation, but they cannot usually move along the left-right axis (y-axis). However, it i...
Using Omni Wheels to Produce Holonomic Movement
Просмотров 14 тыс.10 лет назад
This is a summary of the project I created for the 2014 DC STEM fair. Here is the written abstract I submitted with the original project. In general, vehicles can move in two ways, along the forward-backward axis (x-axis) and by rotation, but they cannot usually move along the left-right axis (y-axis). However, it is possible to use omni wheels to create motion along both the x-axis and the y-a...
Speckle Count to Determine the Age Range of Bottlenose Dolphins (Tursiops sp.)
Просмотров 5910 лет назад
Because of their wide range of behaviors and social structure, as well as ecological and economic influence, dolphins are highly important to oceanographers and therefore have been thoroughly studied by humans. Currently, if researchers need to determine the age of a dolphin, they must extract a tooth and examine the calcium layers, which is similar to aging a tree by its rings. This process is...
The role of transformational leadership, organizational culture and organizational learning...
Просмотров 61111 лет назад
\"This empirical research was conducted to investigate the role of transformational leadership, organizational culture and organizational learning in improving the performance of Iranian agricultural faculties and leading them to become learning organizations (Abbasi and Miandashti, 2013).\"
Factors of Organizational Culture
Просмотров 43211 лет назад
\"The aim of this study is to assess the relationship between some variables and organizational learning culture and evaluate the way they interact with this kind of culture (Rebelo and Gomes, 2010).\"
Serious Games and Learning
Просмотров 11511 лет назад
\"Serious Games and Learning\" is a video abstract I created for three empirical research studies on gaming and learning.
Organizational Learning and Innovation Performance
Просмотров 36211 лет назад
\"The purpose of this study was to examine the antecedent, perception of the external environment, and its relationship to organizational learning, as well as explore the relationships between organizational learning and innovation performance at two levels (Wang and Ellinger, 2011).\"
Multiple-Choice Tests -- Doomed or Redeemed?
Просмотров 13611 лет назад
Are multiple-choice tests inferior to other forms of testing, such as cued-recall tests or short-answer tests? Contrary to commonly held beliefs, a study published at Psychological Science journal shows that they are not. When constructed properly, multiple choice tests can effectively engage both the recognition processes and productive retrieval process enhancing later recall.
INVESTIGATING THE SUCCESS OF DECISION MAKING PROCESSES.
Просмотров 20512 лет назад
INVESTIGATING THE SUCCESS OF DECISION MAKING PROCESSES.
hello Daniel , want to ask u some question . I am going start project about motion control of an omnidirectional robot so can u give me some advice what to start and what should i need to do (means -how to get familiar those things! Thanks
Awesome, but can you please provide the exact protocol!
A small correction, the total transnational velocity is not the SUM of motor speeds in the translation direction, it is the AVERAGE of the motors speeds. Thus the total velocity at 1:18 is (M+M)/2 = M, and the total velocity at 2:00 is (4*M√2/2)/4 = M√2/2
Hey Daniel this video is good, nice project. One question, on the 3 wheel type, have you tried changing the wheels orientation 90 degrees each? That way the wheels are aligned with the centre of the triangle. It makes more sense to me. Do yo think the results would vary?
in that configuration, the robot would not be able to turn at all?