Tag: 苏州龙凤419

Mammals With Super Senses

first_imgThese mammals are very different from each other except in how they put human technology to shame.BatsBats have an ambulance in their ears (Virginia Tech). Echolocating bats have a challenge. They need to be able to follow moths through foliage by sound alone. While they dart through bushes and trees after their prey, bats hear reflected noise from leaves and other objects, each with their own doppler shifts. Researchers at Virginia Tech found that bats perform a trick that filters out the “bad doppler” noise from the “good doppler” of the prey.“The animals move their ears fast enough so that sound waves that impinge on the ears are transformed by the motion of the ear surfaces and shifted to higher or lower frequencies,” said Mueller. “In fact, the bat species studied (horseshoe bats and Old World Roundleaf bats) can move their ears so fast that Doppler shifts of around 350 Hz can be created. This is about seven times larger than the smallest Doppler shift the animals haven been shown to be able to detect.”So how does this ear motion actually help them on the hunt?“The solution these two types of bats have come up with has been to tune in on the Doppler shifts that are produced by the wing beat motion of their prey,” Mueller explained. “These ‘good Doppler shifts’ serve as a unique identifying feature that sets prey apart from static distractors, such as leaves in foliage.”By imitating this trick, the researchers believe it “could give rise to new sensory principles that could enable small, yet powerful sensors,” for instance in “drones that can operate in dense foliage or autonomous underwater vehicles navigating near complex underwater structures.”Evolutionary theory did not help the research. The paper in PNAS says,These species were thought to be evolutionarily tuned to Doppler shifts generated by a prey’s wing beat. Self-generated Doppler shifts from the bat’s own flight motion were, for the most part, considered a nuisance that the bats compensate for. Our findings indicate that these Doppler-based biosonar systems may be more complicated than previously thought because the animals can actively inject Doppler shifts into their input signals.ElephantsElephants can judge the quantity of hidden food just by using smell (New Scientist). Put two buckets of food in front of an elephant, one with more than the other. Without being able to see the food, an elephant will most often pick the bucket with more. Double-blind experiments in Thailand showed that elephant olfaction is more complicated than scientists had thought:Elephants have more brain real estate dedicated to smell than other animals do, which may be related to the fact that their primary concerns are finding food and interacting with other elephants.“For a lot of large mammals, especially herbivorous ones, we don’t really understand what goes into the food finding process, whether it’s quality or quantity,” says Melissa Schmitt at the University of California, Santa Barbara. “This is some of the first evidence of how elephants choose food based on quantity alone, and using olfaction.”NarwhalsNarwhals have endured a million years with low genetic diversity, and they’re thriving (Science Daily). Those arctic whales with long tooth tusks sported by the males know more about genetics than scientists. Usually, scientists consider the amount of genetic diversity as a measure of population health. Danish scientists, however, were surprised that narwhals have low genetic diversity yet are doing well. This is contrary to evolutionary expectations, says the article:Low genetic diversity has historically been viewed as a species’ death sentence because it was thought that when members of a species have less DNA variation for natural selection to act on, they would struggle to adapt to changes in their surroundings. But this research suggests it might be more complicated than that.“There’s this notion that in order to survive and be resilient to changes, you need to have high genetic diversity, but then you have this species that for the past million [Darwin] years has had low genetic diversity and it’s still around — and is actually relatively abundant,” says Eline Lorenzen, an associate professor and curator at the Natural History Museum of Denmark.In each of these articles, evolutionary theory was either useless or wrong, sometimes wrong for decades. The scientists were surprised in each case, by how complicated the observations were.Darwinism is the most useless, simplistic, and wrong theory in the history of science. Can we ditch it and move into the 21st century now? (Visited 252 times, 1 visits today)FacebookTwitterPinterestSave分享0last_img read more

Hollywood stars head for the Cape

first_imgThe Human Factor, a movie about South Africa winning the Rugby World Cup in 1995, will commence production soon. Based on the book The Human Factor: Nelson Mandela and the game that changed the world, the film will be directed by Clint Eastwood and star Morgan Freeman and Matt Damon. 2009 promises to be a watershed year for the film industry in Cape Town and the Western Cape as the Cape Film Commission pushes ahead with its strategy to turn the city and the province into a globally competitive film industry destination. 10 February 2009 The Cape Film Commission plans to launch South Africa’s first online location service in March. It will also work closely with the City of Cape Town’s film permit office in supporting their roll-out of an online location permitting system over the next six months. Twenty-two features films and series were filmed in Cape Town in 2008, including the Bollywood films Seasons Greetings, Life Partner and 8 by 10 (Tasveer). Numerous top international commercials were also filmed in the city, including adverts for Peugeot, BMW, Nivea, Oreo, Coke and Hansa. Pierce Brosnan will soon join the growing list of Hollywood stars who have made films in South Africa when he starts filming Heaven and Earth, a romantic drama set in the Cape Colony in the 1800s. An economic impact assessment carried out three years ago found that the Western Cape film industry contributed an estimated R3.5-billion to South Africa’s gross domestic product (GDP). Cape Film Commission head Laurence Mitchell believes this contribution has now grown to more than R5-billion. Other initiatives to be launched by the commission in 2009 include the Cape Film Industry’s Green Campaign, and the Animation Industry Development Initiative, which will include the establishment of an Animation Satellite Film Resource Centre in the Khayelitsha/Mitchells Plain area. According to the commission, deals are being put together to bring seven major film productions, including a number of Bollywood productions, to Cape Town in the first quarter of 2009, while another animated feature film is also scheduled to go into production in the next few months. The commission has also embarked on a broad plan to train more than 1 000 people in various services disciplines related to High Definition (HD) broadcasting and production, to make sure the industry is ready for the opportunities presented by the 2010 Fifa World Cup and the country’s migration from Standard Definition (SD) to HD broadcasting. SAinfo reporter South Africa’s first full length CGI film, Lion of Judah, was also produced in Cape Town and is set for international release later in the year. And negotiations are under way for another CGI animated film to be made in the province, the commission said in a statement last week. Would you like to use this article in your publication or on your website? See: Using SAinfo materiallast_img read more

Uniformity – Setting the stage for high corn yields

first_imgShare Facebook Twitter Google + LinkedIn Pinterest By Kyle Poling, Pioneer Hi-Bred Field AgronomistKyle Poling“Variability” is not a word any farmer wants to use to describe one of their corn fields. While uniformity during the periods of germination, emergence, and nodal root formation is the goal, there are many management practices and environmental conditions that can impact this objective.Corn germination is triggered by absorption of water. Corn kernels must absorb approximately 30% of their weight in water before the germination process begins. A seeding depth of 2 inches has often been found to provide the most consistent combination of moisture, temperature, and seed-to-soil contact for uniform germination and emergence. Inadequate seed-to-soil contact, a dry seedbed, or a rapidly drying seed zone may provide less than optimum absorption of water, causing the germination process to slow or stop completely. Additionally, corn kernels that absorb excessively cold water (less than 50 degrees F) during the first 24 to 48 hours of germination may experience serious injury or death, resulting in erratic emergence.Corn typically requires 120 Growing Degree Units (GDUs) to emerge. Plant growth rate speeds up as temperatures increase, leading to more rapid plant growth. Under ideal conditions, corn will emerge in five days, but with cooler soil temperatures the process may take 3 weeks or longer. Between germination and emergence, factors altering soil temperature around each seedling will have significant impact root and shoot growth. Inconsistent seeding depth, variation in soil moisture, changes in soil type/topography, or uneven distribution of crop residue are leading causes for plant growth variability. For example, emergence of seeds planted into heavy residue can take require an additional 30 to 60 GDUs simply because the soils are cooler and slower to warm. Though uniform emergence is important for optimum yield it does not guarantee successful or uniform stand establishment.Increased farm size, shorter planting windows, and higher yield potential are factors that have caused corn planting dates to trend earlier and earlier. Improved genetics and seed treatments are key components that allow growers to offset the environmental challenges that accompany an early planting date. Cool, moist soils provide an ideal environment for fungal diseases, early season insects, seed rots, and nematodes to infect slow growing plants. Seed treatments offer 10 to 14 days of protection against many of the most common early season pest and pathogens. Direct benefits to the corn crop include increased seedling vigor, healthier plants, improved uniformity, and reduced plant death.A corn seedling relies on the energy from the seed until the permanent (nodal) root system is established, around the V3 stage. There are enough seed reserves, with the help of the primary roots (referred to in the figure as the seminal roots and radicle), to support the plant for 4 to 5 weeks. Before the nodal root system is well established, a corn plant is susceptible to various early season stresses that cause injury to the seed, primary roots, and mesocotyl (“pipeline” connecting seed and primary roots to the plant). A healthy kernel, primary roots, and mesocotyl are vital until the nodal roots are fully functional.A slow developing nodal root system increases the window of time for seedling blights, insect feeding, excessively wet/dry soils, seeds rots, and other early season stresses to damage the seed and mesocotyl. Any severe stress that occurs during the time of transition to the permanent root system can cause a corn field that emerged perfectly uniform to go “backwards” in as little as a week’s time. This is also the time when the effects of sidewall compaction or compaction from equipment operations can become apparent.Uniformity is one of first ingredients necessary to maximize corn yield. Variability in the crop will lead to unfair competition of adjacent plants as they fight for sunlight, moisture, and nutrients. The goal should be for every seed to emerge and every plant to be a mirror image of its neighbor.last_img read more

The Sony A7S Can Use Canon Batteries, Here’s How

first_imgLearn how to use Canon batteries on your Sony A7S with this helpful hack.If you are a Sony A7S owner than we may have found an awesome hack that allows you to use Canon LP-E6 batteries with your Sony camera. The following video created by Whitespace Films shows us how it’s done and it’s surprisingly easy. To use this hack you will need to buy a few things:1. An AC Adapter for the Sony A7S$20.00 on Amazon2. Canon LP-E6 Mounting Plate $15.69 on Amazon You also might want to pick us some velcro so you can attach the mounting plate to your rig depending on your set up. You can get velcro from Amazon for around $5.This video was first shared by Whitespace Films on their Vimeo channel. Thanks for sharing guys!This technique also works for other cameras and camera batteries as well. All you need to do is find the correct AC adapter (dummy battery) and the correct mounting plate. It’s a worthwhile hack that can save you the hassle of having to buy batteries for each individual camera.Want to see more battery hacks? Check out our ‘Get 9 Hours of DSLR Battery Life for Less than $100’ post.Know of any other battery hacks? Share in the comments below.last_img read more

No stone will be unturned says HE Peter Beckingham

first_img Related Items: Facebook Twitter Google+LinkedInPinterestWhatsApp Facebook Twitter Google+LinkedInPinterestWhatsAppProvidenciales, TCI, July 22, 2016 – No stone unturned in the murder investigation of 26 year old Sorineida Arias and others was the promise of the Governor in a media statement issued by his office, yesterday.  His Excellency Peter Beckingham said that he has met with Edwin Hernandez of the Dominican Consulate and assured him that there is no problem with the Dominican Community holding demonstrations, and that he is satisfied that the incident was isolated.  “I was grateful for the reassurances of the DR community that any gatherings should be peaceful, and that they regretted the isolated attacks on the police by a small number of their group.” Confidence was again expressed in the Commissioner and his team to solve the crimes, and next week when the National Security Council meets, there will be heavy discussion on, as H.E. put it, ‘options to strengthen security measures.’last_img read more

Impart good values among other colleges also Partha urges Bethune teachers

first_imgKolkata: State Education minister Partha Chatterjee urged the teachers and administrators of Bethune College to make efforts to spread their good values and practices among other colleges in the state as well.”I sometimes wonder there are so many colleges in the state but institutions like Bethune College has been able to maintain a standard of excellence not only in academics but in other activities too. You should come forward and spread the message of how you are inculcating good values and practices among your students to the other colleges also,” Chatterjee said at the annual prize distribution and inauguration of some new facilities at the 140-year-old Bethune College on Wednesday. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedHe made it clear that the government alone cannot do everything and good colleges like Bethune, Lady Brabourne, St Xaviers should come forward and take up the job of passing on their values to other colleges through seminars or other interactive sessions. “Excellence should not be confined within your own boundaries. You have to go beyond and pass it over to rural colleges also,” the minister said. Chatterjee also mentioned the first lady graduate from the state — Kadambini Ganguly — who was from Bethune, the first women doctorate Asima Chattopadhyay, who was also from Bethune and lauded the efforts of the institution in India’s freedom struggle. Also Read – Bose & Gandhi: More similar than apart, says Sugata BoseChatterjee maintained that the government is making serious efforts to raise the level of higher education in the state and has started 42 new universities and 6,500 higher secondary schools in the state since 2011 after the Trinamool Congress government took over. “The enrolment ratio that was 11.92 percent in the year 2011 has gone up to 20 percent now.” The minister also stressed on collective force of the teachers, administrators, non-teaching staff and students to earn a good reputation of an institution and remarked that Bethune has set a precedence in this regard.last_img read more