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相关概念视频

Isothermal Processes01:21

Isothermal Processes

A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
Global Climate Change01:50

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
The Fossil Record02:56

The Fossil Record

The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
Thermal Strain01:19

Thermal Strain

Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
Formation of the Platelet Plug01:22

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
Sutures of the Skull01:22

Sutures of the Skull

The human skull is composed of several bones that come together to protect the brain and support the structures of the face. The junctions where these bones meet are called sutures.
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...

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相关实验视频

Updated: May 8, 2026

Subdural Soft Electrocorticography (ECoG) Array Implantation and Long-Term Cortical Recording in Minipigs
08:30

Subdural Soft Electrocorticography (ECoG) Array Implantation and Long-Term Cortical Recording in Minipigs

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切割在安第斯山东高原在平世冷却期间的切割.

Richard O Lease1, Todd A Ehlers

  • 1Department of Geosciences, University of Tübingen, Tübingen, Germany. rlease@usgs.gov

Science (New York, N.Y.)
|August 17, 2013
PubMed
概括
此摘要是机器生成的。

安第斯山脉的峡谷切割是由气候变化驱动的,而不仅仅是构造上的升起. 全球温度的降温增强了水分的运输,引发了普略世高原的峡谷形成.

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Long-Term Imaging of Identified Neural Populations using Microprisms in Freely Moving and Head-Fixed Animals
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Long-Term Imaging of Identified Neural Populations using Microprisms in Freely Moving and Head-Fixed Animals

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Surgical Induction of Endolymphatic Hydrops by Obliteration of the Endolymphatic Duct
11:49

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Published on: January 22, 2010

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Subdural Soft Electrocorticography (ECoG) Array Implantation and Long-Term Cortical Recording in Minipigs
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Long-Term Imaging of Identified Neural Populations using Microprisms in Freely Moving and Head-Fixed Animals
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Surgical Induction of Endolymphatic Hydrops by Obliteration of the Endolymphatic Duct
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Surgical Induction of Endolymphatic Hydrops by Obliteration of the Endolymphatic Duct

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科学领域:

  • 地球科学 地球科学 地球科学
  • 地质地质地质地质地质地
  • 气候学 气候学 气候学

背景情况:

  • 峡谷切口通常与构造表面升起有关.
  • 然而,气候变化也可以推动峡谷的形成.
  • 安第斯高原东部的特点是穿越主要变形区的深峡谷.

研究的目的:

  • 调查沿安第斯高原东部峡谷切口的驱动因素.
  • 区分构造学和气候影响对峡谷发展的影响.
  • 建立该地区地质和气候事件的时间表.

主要方法:

  • 利用 (U-Th) /He热年代学来确定地质事件的日期.
  • 分析了断层和峡谷切口之间的空间和时间关系.
  • 与古气候数据相关的地质发现,特别是海面温度.

主要成果:

  • 在东北高原边缘记录了从米奥森断层转移到奥森峡谷切口的转移.
  • 观察到广泛的普略世峡谷切口与全球气候从温暖转向冷却的转变相吻合.
  • 在普略纪晚期的冷却过程中,确定了对高原的增强湿度传输.

结论:

  • 气候变化,特别是新纪晚期的冷却,是峡谷切割的主要驱动因素.
  • 海洋表面温度波动影响了水分传输,加快了峡谷的发展.
  • 与气候相比,构造活动在普略纪峡谷切口中起的作用较小.