| 单词 | growth ring |
| 例句 | He crouched down at the cut ends and peered at the annual growth rings, trying to get a nuanced read on how tight and regular the grain within was likely to be. The Boys in the Boat: Nine Americans and Their Epic Quest for Gold at the 1936 Berlin Olympics 2014-05-27T00:00:00Z Jack says you can count the rings on their shells to determine their age, the same way you would count the growth rings in a tree’s trunk. The Sea in Winter 2021-01-05T00:00:00Z He pulled a long cedar plank from a rack and pointed out the annual growth rings. The Boys in the Boat: Nine Americans and Their Epic Quest for Gold at the 1936 Berlin Olympics 2014-05-27T00:00:00Z The boards might be flat-sawn, meaning they were made from pieces sliced from a log in a way that shows the annual growth rings in the tree before it was cut. Dealing with a wooden porch that buckles when it rains 2018-08-10T04:00:00Z That’s because a single color can’t match the color variations in natural wood, thanks to the annual growth rings and other features that grew into the wood when the tree was alive. How to repair a gouged wood floor 2018-06-29T04:00:00Z The patterns of the annual growth rings, part of what McKenna calls "Automatic Earth," speak of rippling water and planetary orbits, of topographic maps and resonating echoes. What to see in L.A. galleries: Hot-button greeting cards, mesmerizing photograms 2016-11-28T05:00:00Z You might notice growth rings on each scute. Curious about turtles? The shelled reptile is easy to observe. 2016-05-16T04:00:00Z As trees do, clam shells form yearly growth rings. He found a clam he figured was born in 1809 and named it ‘Abra-clam Lincoln’ 2023-03-11T05:00:00Z Her talk about growth rings hollow, just as it did in an interview that she and Ms. Winfrey conducted in August, which was broadcast as an episode of “Oprah’s Next Chapter.” Television Review: Following Lindsay Lohan After Her Latest Rehab 2014-03-10T21:29:04Z Flat-grain boards expand more across their width than boards cut so that the growth rings are mostly up and down. Dealing with a wooden porch that buckles when it rains 2018-08-10T04:00:00Z Researchers estimated the tree’s minimum age of 13,000 years by measuring growth rings and the rate of its spread of new shoots prompted by fire. Ancient California tree may be threatened by proposed Riverside County development 2023-11-06T05:00:00Z Tree trunks have growth rings; each concentric circle represents one year. Dead Trees and a Mysterious Cosmic Explosion Reveal Bigger Quake Risk for Seattle 2023-09-27T04:00:00Z Tree ring scientists match annual growth ring patterns between living and dead trees, and can establish a continuous chronology for thousands of years. New massive earthquake threat to Seattle revealed in ancient trees 2023-09-26T04:00:00Z Instead, as the growth rings reveal, they grew impressively quickly—on par with the growth rates seen in many large mammals today—attaining adult size in 20 to 50 years. How Sauropod Dinosaurs Became the Biggest Land Animals Again and Again 2023-08-15T04:00:00Z Until recently, the only reliable way to determine the age of a polar bear has been to extract a premolar and inspect its growth rings. How Old Is That Polar Bear? The Answer Is in Its Blood. 2023-08-10T04:00:00Z The activity of the vascular cambium gives rise to annual growth rings. Fundamentals of Biology 2015-01-01T00:00:00Z Many native Egyptian tree species don’t produce annual growth rings, complicating the quest for Miyake events there. Marking time: Cosmic ray storms can pin precise dates on history from ancient Egypt to the Vikings 2023-04-13T04:00:00Z This makes a tree’s annual growth rings a year-by-year record of local environmental conditions and prevailing atmospheric chemistry and allows scientists to use ancient, well-preserved wood to probe many millennia back in time. Mystery of Ancient Space Superstorms Deepens 2023-03-06T05:00:00Z Junipers are an especially long-lived species, which meant the growth rings within their trunks would contain a record of the weather throughout their life spans. Drought may have doomed this ancient empire — a warning for today’s climate crisis 2023-02-08T05:00:00Z Because just as maple was gaining popularity, quality ash timber — with the favorable eight to 12 growth rings per inch — was harder to come by. Baseball History Is No Longer Written With Ash Bats 2022-10-20T04:00:00Z That means the trees’ growth rings were small and dense, thereby making it harder for water to seep in. Historic homes may prove to be more resilient against floods 2022-10-09T04:00:00Z Fortunately, however, we can use other data, such as tree dating via examination of annual growth rings, to calculate correction factors. Chemistry 2019-02-14T00:00:00Z In plants with stems that live for more than one year, the individual bundles grow together and produce the characteristic growth rings. Biology for AP Courses 2022-06-09T00:00:00Z When part of the shell is cut away, a perfect spiral is revealed, with chambers inside that are somewhat similar to growth rings in a tree. Calculus, Vol 2 2016-03-30T00:00:00Z Dendrochronology is the study of tracking tree age by using growth rings. California’s ‘Methuselah’ bristlecone pine may no longer be the world's oldest tree 2022-06-06T04:00:00Z When previous paleontologists attempted to learn if dinosaurs were warm-blooded, they looked for growth rings or chemical isotope signals in the blood, both of which are less reliable because they can alter during fossilization. Were dinosaurs warm- or cold-blooded? New study settles an old debate 2022-05-29T04:00:00Z In unpublished work, he paired a partial count of the tree’s growth rings with statistical modeling to calculate that the alerce has an 80% probability of being more than 5000 years old. News at a glance: Judge suspends dog facility, Australia pledges climate action, and NIH pursues antivirals 2022-05-25T04:00:00Z The vascular bundles join to form growth rings. Biology for AP Courses 2022-06-09T00:00:00Z That would make it at least 1 century senior to the current record holder: Methuselah, a bristlecone pine in eastern California with 4853 years’ worth of annual growth rings under its gnarled bark. Is the world’s oldest tree growing in a ravine in Chile? 2022-05-19T04:00:00Z The partial sample of the tree’s wood showed about 2,400 growth rings. California’s ‘Methuselah’ bristlecone pine may no longer be the world's oldest tree 2022-06-06T04:00:00Z Annual growth rings in certain fish bones - resembling those in tree trunks - showed increased growth levels associated with springtime after reduced growth in leaner winter months. A good day to die: doom for the dinosaurs came in springtime 2022-02-23T05:00:00Z They used ancient records of these droughts captured in the growth rings of trees. Intensified by climate change, Western megadrought is worst in 1,200 years, study finds 2022-02-14T05:00:00Z Back in the lab, Lambert and his colleagues scraped bits of wood from each of the trees’ annual growth rings, the oldest of which dated to 1930. Signs of Pinochet’s coup spotted in Chilean tree rings 2022-01-03T05:00:00Z Many dendrochronologists are likely to be skeptical of Barichivich’s claim, which has not yet been published, because it does not involve a full count of tree growth rings. Is the world’s oldest tree growing in a ravine in Chile? 2022-05-19T04:00:00Z A tree’s annual growth rings reveal how it has flourished—or floundered—over time, with the size of the rings indicating years of health or hardship. ‘False’ tree rings could provide a new record of long-ago hurricanes 2021-12-17T05:00:00Z My research in tree physiology and dendrochronology – dating and interpreting past events based on trees' growth rings — shows that in general, trees in the eastern U.S. have fared quite well in a changing climate. Climate change is muting fall colors, but it's just the latest way humans have altered US forests 2021-11-03T04:00:00Z The new dating method relies on the fact that solar storms produce a distinctive radiocarbon signal in a tree’s annual growth rings. Goodbye, Columbus: Vikings crossed the Atlantic 1,000 years ago 2021-10-20T04:00:00Z Before 1890, Johnston’s research has shown, chunks of forest typically burned every 11 to 21 years, the scorch marks visible in a tree’s annual growth rings. A huge forest experiment aims to reduce wildfires. Can it unite loggers and environmentalists? 2021-09-15T04:00:00Z The plug of wood yielded roughly 2400 tightly spaced growth rings. Is the world’s oldest tree growing in a ravine in Chile? 2022-05-19T04:00:00Z But sometimes nature throws a wrench into the works, and a tree will form more than one growth ring in a year. ‘False’ tree rings could provide a new record of long-ago hurricanes 2021-12-17T05:00:00Z Researchers found the evidence for these megadroughts in the annual growth rings in the trunks of ancient trees. What Is a Megadrought? 2021-06-17T04:00:00Z The cones were twice the length of modern white spruce cones, and the wood was "peculiar," the growth rings unusually narrow. The enduring mystery of Critchfield’s spruce 2021-02-14T05:00:00Z Daily growth rings on a 70-million-year-old fossilized mollusk indicate that Earth turned faster at the time, squeezing 372 days into each year. In Case You Missed It 2020-06-20T04:00:00Z The growth rings seen in the vertebrae revealed that the sharks were 35 and 50 years old when they died. Nuclear bombs could give insight into whale sharks' longevity, study says 2020-04-06T04:00:00Z “A laser cuts through the tooth to analyze whether lead is embedded in the growth rings of teeth,” the program reports. Expert: Flint children’s baby teeth to be examined for lead 2020-03-16T04:00:00Z Variations in thickness, density, and chemical composition of growth rings reveal climatic conditions year by year. Scientists are leading Notre Dame’s restoration—and probing mysteries laid bare by its devastating fire 2020-03-12T04:00:00Z The study, published in Paleoceanography and Paleoclimatology, looked at an extinct rudist clam and found that it had a growth ring on its shell for every day of the nine years it was alive. Dinosaurs had shorter days and longer years, according to new study 2020-03-12T04:00:00Z The uneven spacing of the growth rings suggests that young T. rexes responded to the amount of resources available, growing quickly when food was plentiful, and stopping growth altogether when times were lean. Beware Tyrannosaurus Rex Teenagers and Their Growth Spurts 2020-01-03T05:00:00Z "We found that one growth ring was definitely deposited every year," Dr. Mark Meekan from the Australian Institute of Marine Science, said in a statement. Nuclear bombs could give insight into whale sharks' longevity, study says 2020-04-06T04:00:00Z "The spacing between annual growth rings record how much an individual grows from one year to the next," Woodward said. Tyrannosaurus rex had massive growth spurt as teenager, study finds 2020-01-02T05:00:00Z By connecting the growth ring record with what’s known about economic conditions at the time, researchers hope to see how climate variations affected medieval society, she says. Scientists are leading Notre Dame’s restoration—and probing mysteries laid bare by its devastating fire 2020-03-12T04:00:00Z Much like trees, corals produce growth rings that record climatic conditions like seawater temperatures and rainfall as they grow. In New York lab, centuries-old corals hold clues to climate shifts 2019-12-05T05:00:00Z In addition to the tree itself being relatively straight, the fibers in each growth ring generally need to be smooth and straight in order to yield strips suitable for weaving. How an invasive pest threatens a Native American tradition 2019-11-25T05:00:00Z If you compared an end cut of a 2×4 sold at a modern lumber yard to a reclaimed 2×4 end cut, you would quickly notice a big difference: growth rings. Build character by incorporating reclaimed wood | Produced by Advertising Publications 2019-07-24T04:00:00Z Dr. Erickson did microscopic studies of bone growth rings, which led to a determination of how old individual dinosaurs were and how fast they grew. Tyrannosaurus Rex: The Once and Future King 2019-03-04T05:00:00Z The width of the outer growth rings would tell the story of the tree’s final four decades. Southern California's ecosystems evolved to survive fire. But not like this 2019-01-11T05:00:00Z It’s easy to forget that no one was even sure corals set down annual growth rings until the 1970s. Cores from Coral Reefs Hold Secrets of the Seas' Past and Future 2018-06-06T04:00:00Z “I’m checking this one,” he says, notching a promising-looking trunk with two sharp hits of a hatchet, the small wedge of wood revealing the growth rings inside. How an invasive pest threatens a Native American tradition 2019-11-25T05:00:00Z Certain types including oak show cellular-level damage when swamped, and which is visible in the trees’ growth rings, providing an annual record of when the river overflowed. Taming the Mighty Mississippi May Have Caused Bigger Floods 2018-04-10T04:00:00Z “The structure was in the form of growth rings, like that of a tree, and I’d seen something similar before in the jaws of late Jurassic ichthyosaurs,” he said. Jaw fossil from English beach belongs to monstrous marine reptile 2018-04-09T04:00:00Z Tree growth rings vary in width with annual precipitation, providing a record of past climates. Tree rings reveal increased fire risk for southwestern US 2018-02-07T05:00:00Z If the coral core layers contained radioactive elements with a known half-life, it would be possible to calculate almost exactly when each growth ring was made. Cores from Coral Reefs Hold Secrets of the Seas' Past and Future 2018-06-06T04:00:00Z Maybe he thought he was being harassed by a strange two-legged giant, who raised a big finger to count the five or six growth rings on the turtle’s underbelly. Blanding turtle finds safe haven in Nebraska 2017-08-05T04:00:00Z This led him to assemble a team of physicists, chemists, biologists, historians and geographers to investigate the matter, starting with an analysis of the buried trees’ annual growth rings. Events in Iceland explain years of famine in Europe’s Dark Ages 2017-07-18T04:00:00Z Look at the end of a piece of dimensional lumber, such as a 2 by 10, and note the width of the growth rings of the tree. Perspective | Are homes of today built better than the ones of yesteryear? That’s an open question. 2017-06-27T04:00:00Z Below their bark and cambium layer, cells divide, laying down growth rings. In ‘Witness Tree,’ a writer spends a year exploring a red oak’s changes 2017-04-06T04:00:00Z When the coral slices were put in the X-ray scanner, a distinctive series of light and dark growth rings became visible, reflecting the density of the calcium carbonate that made up the coral skeleton. Cores from Coral Reefs Hold Secrets of the Seas' Past and Future 2018-06-06T04:00:00Z Mr. Hill likened these layers upon layers of sediment to the growth rings of a tree. Scientists Glimpse New York’s Perilous Path in an Ancient Patch of Marsh 2017-01-19T05:00:00Z “What we do is, we first identify the annual growth rings on a given piece of wood,” Ms. Fraiture said. A Master Work, the Ghent Altarpiece, Reawakens Stroke by Stroke 2016-12-19T05:00:00Z The light-colored growth rings that represent the wood added to the tree in the spring of each year are much narrower than those from modern trees. Perspective | Are homes of today built better than the ones of yesteryear? That’s an open question. 2017-06-27T04:00:00Z Capparella, who estimated the tree’s age by using a formula taking various factors into account, is looking forward to the growth rings being counted once the tree is down. Illinois State University says farewell to 235-year-old tree 2016-10-20T04:00:00Z Fossilized corals may contain sequences of growth rings that date back as far as the last interglacial period, more than 100,000 years ago. Cores from Coral Reefs Hold Secrets of the Seas' Past and Future 2018-06-06T04:00:00Z The proof was in a picture painted by growth rings exposed to the surface of the stumps. Forest for sale 2016-09-11T04:00:00Z No, really: Unlike bonier fish, Greenland sharks lack distinctive growth rings for researchers to count like those in a tree. Greenland sharks live to be ridiculously old — and may not have sex until they’re 150 2016-08-11T04:00:00Z His aim was not to count growth rings, but instead to measure the various forms of carbon in the lenses, which can give clues to an animal’s age. Greenland shark may live 400 years, smashing longevity record 2016-08-11T04:00:00Z Though they bear evidence of Judith's difficult life, the fossils also testify to her incredible resilience: growth rings in her shin bone show that she lived through her illness and the attack. This dinosaur had a heartbreaking life. Now she’s famous — and an inspiration. 2016-05-18T04:00:00Z X-ray scans are still used today to assess the relative density of coral growth rings, which reflects the climatic conditions at the time the rings were created. Cores from Coral Reefs Hold Secrets of the Seas' Past and Future 2018-06-06T04:00:00Z Growth rings in its leg bones, akin to annual growth rings in trees, showed it was 14 years old, still not fully grown. 'Superduck' dinosaur provides insight into elaborate head crests 2015-11-11T05:00:00Z It is difficult to calculate the age of ancient yews, as their annual growth rings rot away. Berries show ancient Fortingall yew tree is 'changing sex' - BBC News 2015-11-02T05:00:00Z His team examined microscopic “growth rings” in Jane’s calf bone, which accumulate per year of life. Top predator wannabe is just another T. rex 2015-10-16T04:00:00Z The low was based on records of snowfall and temperatures inferred from annual growth rings of blue oaks and other trees, meaning some uncertainties about extremes in past centuries. California's Sierra Nevada snowpack estimated at 500-year low 2015-09-14T04:00:00Z The growth rings of tree trunks are one such proxy — thin rings mean growth stunted by a lack of water. California’s History of Drought Repeats 2015-04-13T04:00:00Z Scientists compared the growth rates of hundreds of living and extinct species, using growth rings and bone size to calculate the rates for dinosaurs. Dinos neither warm nor cold blooded 2014-06-12T04:00:00Z For dinosaurs, that included techniques such as counting the number of growth rings in fossilized bone, to estimate an individual's age, and measuring the length of its bones, to estimate total mass. Dinosaurs neither warm-blooded nor cold-blooded 2014-06-11T04:00:00Z These hard calcium deposits, also called “ear stones,” acquire growth rings based on different rates of growth over various seasons. Hey, How Old Is That Octopus? 2013-10-30T20:45:00.480Z In ash trees, the veinlike vessels that carry water up through the trunk are larger and arrayed in clear, almost regimental form in the growth rings. Science Lowers Shattering Risk at Home Plate 2013-07-26T02:44:42Z Still others have been ground down, so that all that’s left of them is a series of raised concentric oblongs, like a cinnamon bun or the growth rings on a tree. Margaret Atwood: “Stone Mattress.” 2011-12-12T05:00:00Z Because bones show growth rings much like trees, the size of fossilised dinosaur bones at different ages allows palaeontologists to calculate how fast they put on weight over a lifetime. Dinos neither warm nor cold blooded 2014-06-12T04:00:00Z A cross section of a bristlecone pine with its annual growth rings. Green Blog: Pines Help Reconstruct a Long-Ago Drought 2011-11-07T18:29:10Z Therefore, the width of the annual growth rings correlates with environmental variables like temperature or precipitation. Ancient Clams Yield New Information on Greenhouse Effect 2011-08-18T15:27:00Z For instance, will the growth rings of mastodon or mammoth tusks found here differ from those of cousins found at low altitude sites, hinting at permanent mountain residence? Pleistocene Treasures, at a Breakneck Pace 2011-07-04T19:42:29Z The data, gathered from the annual growth rings in trees, supplies precise dates for the duration of three historically important droughts, including one that was previously unknown. Rings Reveal Extensive Yearly Climate Record 2011-04-20T15:54:00Z The researchers then used this data to reconstruct annual weather patterns from the growth rings preserved in the artefacts. Fall of Rome 'recorded in trees' 2011-01-14T17:19:22Z Roopnarine and his colleagues will study growth rings in the shells—much like scientists would study tree rings—to determine how quickly harmful compounds from the oil become incorporated into the animals' homemade armor. Scientists Study Impact of Gulf Oil Spill on Marine Food Webs 2010-12-28T16:16:00Z “We used growth rings in their shells to analyze changes in year-to-year growth rate, and linked that to changes in climate that are characteristic of El Niño today.” Ancient Clams Yield New Information on Greenhouse Effect 2011-08-18T15:27:00Z The tree’s exact age will be known after officials count the growth rings in the trunk. 2010-01-20T16:54:00Z But look at some ancient beech growing thus, whose smooth, whitened hole encloses a century of growth rings. The Log of the Sun A Chronicle of Nature's Year C, cross-section of a two-year-old branch at the point where the two growth rings join: I, the cells of the first year’s growth; II, those of the second year. m, a medullary ray, × 150. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The test is chitinous; covered by foreign particles, growth rings frequent Genus *Tintinnopsis 4. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 According to growth rings on trees, last spring was the driest in the Beta Piedmont in centuries, so most of them survived, and as they’re parthenogenetic females, they all laid eggs. Little Fuzzy These brought out the character of the end grain and the annual growth rings, as well as the size of the trees from which each specimen came. Final Report of the Louisiana Purchase Exposition Commission Moreover, the smaller the specimen the fewer growth rings it contains, hence there is greater opportunity for variation due to irregularities of grain. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing On examining the xylem, where two growth rings are in contact, the reason of the sharply marked line seen when the stem is examined with the naked eye is obvious. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Cup or ring shake results from the pulling apart of two or more growth rings. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Upon the whole, however, as a tree gets larger in diameter the width of the growth rings decreases. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing In diffuse-porous woods the pores are scattered throughout the growth ring instead of being collected in a band or row. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing The relationship between width of growth rings and the mechanical properties of wood is discussed under Rate of Growth. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Wood usually splits more readily along the radius than parallel to the growth rings though exceptions occur, as in the case of cross grain. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing If one examines the smoothly cut end of a stick of almost any kind of wood, he will note that each growth ring is made up of two more or less well-defined parts. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Figure 23 Cross section of longleaf pine showing several growth rings with variations in the width of the dark-colored late wood. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Since the late wood of a growth ring is usually darker in color than the early wood, this fact may be used in judging the density, and therefore the hardness and strength of the material. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing Part of the blocks are cut so that the shearing surface is parallel to the growth rings, or tangential; others at right angles to the growth rings, or radial. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing In the latter case it is quite probable that the wood would split straight, the line of cleavage being between the growth rings. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing This is likely to occur where the logs have considerable taper, and in this case may be produced if sawed parallel to the axis of growth instead of parallel to the growth rings. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing As a tree reaches maturity its crown becomes more open and the annual wood production is lessened, thereby reducing still more the width of the growth rings. The Mechanical Properties of Wood Including a Discussion of the Factors Affecting the Mechanical Properties, and Methods of Timber Testing |
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