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Upsampling01:22

Upsampling

262
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
262
Degree of Unsaturation02:05

Degree of Unsaturation

8.0K
The degree of unsaturation (U), or index of hydrogen deficiency (IHD), is defined as the difference in the number of pairs of hydrogen atoms between the compound and the acyclic alkane with the same number of carbon atoms. Each double bond or ring costs two hydrogen atoms compared to a saturated analog and results in one degree of unsaturation.
The degree of unsaturation for hydrocarbons is U = (2C + 2 − H) / 2, where C is the number of carbon atoms and H is the number of hydrogen atoms.
8.0K
Urodynamic Studies: Uroflowmetry01:19

Urodynamic Studies: Uroflowmetry

83
Uroflowmetry is a non-invasive urodynamic test designed to measure various aspects of urination, including volume, flow rate, and the time to void. This test is crucial for diagnosing and assessing conditions such as bladder outlet obstruction, bladder dysfunction, incomplete bladder emptying, incontinence, and urinary tract blockages caused by benign prostatic hyperplasia (BPH) and urethral strictures.Pre-Test Instructions:Before a uroflowmetry test, patients are typically advised to drink...
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Ultrasonography01:17

Ultrasonography

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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
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Imaging Studies V: Intravenous Urography and Retrograde Pyelography01:22

Imaging Studies V: Intravenous Urography and Retrograde Pyelography

57
IntroductionIntravenous Urography (IVU) and Retrograde Pyelography (RP) are important diagnostic imaging techniques used to evaluate the urinary system. These methods help identify structural abnormalities, obstructions, and functional issues in the kidneys, ureters, and bladder. Both procedures use iodine-based contrast media to enhance the visibility of urinary tract structures on X-ray images, though they differ in their methods and indications.1. Intravenous Urography (IVU)Intravenous...
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Anatomy of the Genitourinary System I: Kidneys and Ureters01:11

Anatomy of the Genitourinary System I: Kidneys and Ureters

40
The upper urinary system comprises two kidneys and two ureters, which are crucial in filtering blood and forming urine.KidneysLocation and Structure:The kidneys are two bean-shaped organs positioned behind the peritoneum on either side of the spine.Kidneys are between the 12th thoracic (T12) and the 3rd lumbar (L3) vertebrae.The position of the liver causes the right kidney to sit slightly lower than the left.Protective Layers:Each kidney is enveloped in a tough, fibrous membrane called the...
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Updated: Jul 19, 2025

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
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U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

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向上是最好的.

Stuart Anstis1, Patrick Cavanagh2

  • 1Department of Psychology, University of California San Diego, La Jolla, USA.

i-Perception
|August 8, 2023
PubMed
概括
此摘要是机器生成的。

模两可的视觉模式往往似乎指向上. 这项研究揭示了这种"上升偏差"源于人们对感知深度偏好的偏好,深度从较低的视野退到较高的视野.

关键词:
轮/表面的轮/表面场景感知 场景感知形状/对象的使用.空间认知 空间认知

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科学领域:

  • 视觉感知 视觉感知 视觉感知
  • 认知心理学 认知心理学
  • 神经科学是一个神经科学.

背景情况:

  • 模两可的视觉刺激往往表现出一个向上方向偏差.
  • 这种现象是通过地面上物体的普遍性直观地解释的.
  • 然而,潜在的感知机制仍然不完全理解.

研究的目的:

  • 在模两可的模式中调查上升偏差的感知基础.
  • 为了确定这种偏差是否与深度感知和视野方向有关.

主要方法:

  • 参与者看到了模两可的视觉图案,其方向不同.
  • 任务涉及判断模式方向和感知深度.
  • 分析的重点是感知深度方向和方向偏差之间的关系.

主要成果:

  • 观察到一个显著的偏差,模式似乎指向上.
  • 这种上升偏差与偏好感知深度从较低视野退到较高视野的偏好相关.
  • 这些发现表明视觉处理中的特定机制有助于这种偏见.

结论:

  • 模两可的模式上升偏差不仅仅是由于对象的流行.
  • 它受到视野内深度感知方向偏好的显著影响.
  • 这突出了特定视野偏差在解释模两可的刺激中的作用.