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Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Types Of Transformers01:16

Types Of Transformers

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Transformers can provide desired voltages to a circuit by modifying the number of turns in the secondary windings.
If the ratio of the number of turns in the secondary winding to that of the primary winding is greater than one, then the transformer is said to be a step-up transformer. In a step-up transformer, the voltage at the secondary winding is greater than the voltage applied at the primary winding.
However, if this ratio is less than one, the transformer is said to be a step-down...
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Transformers01:26

Transformers

1.1K
A device that transforms voltages from one value to another using induction is called a transformer. A transformer consists of two separate coils, or windings, wrapped around the same soft iron core. However, they are electrically insulated from each other.
The iron core has a substantial relative permeability. Therefore, the magnetic field lines generated due to the current in one winding are almost entirely confined within the core, such that the same magnetic flux permeates each turn of both...
1.1K
Source Transformation01:15

Source Transformation

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Source transformation is a fundamental technique employed in circuit analysis, offering a valuable tool for simplifying complex electrical circuits. This technique involves the replacement of either a voltage source in series with a resistor by a current source in parallel with a resistor, or vice versa. The key concept here is that when the original sources are deactivated (turned off), the equivalent resistance at the circuit's end terminals remains the same.
It is essential to note that when...
4.2K
Cis-regulatory Sequences02:02

Cis-regulatory Sequences

9.8K
Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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Source Transformation for AC Circuits01:11

Source Transformation for AC Circuits

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The process of source transformation in the frequency domain entails the conversion of a voltage source, positioned in series with an impedance, into a current source that is parallel to an impedance, or the other way around. It is essential to maintain the following relationships while transitioning from one source type to another.
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相关实验视频

Updated: Jun 18, 2025

Author Spotlight: Introducing the Tile/SED/Array Interface for Rapid Field of View Positioning in Tissue Imaging
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将本体学网络语言元素转化为通用术语服务 2 术语资源

Sara Mora1, Roberta Gazzarata2, Bernd Blobel3

  • 1UO Information and Communication Technologies, Istituto di Ricovero e Cura a Carattere Scientifico Ospedale Policlinico San Martino, 16132 Genoa, Italy.

Journal of personalized medicine
|July 27, 2024
PubMed
概括

本研究介绍了一种使用常用术语服务发布2 (CTS2) 和OWL.L.的方法来管理不断变化的医学本体. 它通过实现一致的本体学转换来解决P5医学知识共享的挑战,如阿尔茨海默氏病本体学 (ADO) 所示.

关键词:
在CTS2中,CTS2是CTS2的第二种类型.生物医学领域的生物医学领域.存在论的存在学语义互操作性语义互操作性术语资源 术语资源 术语资源

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科学领域:

  • 医疗信息学 医疗信息学
  • 知识表示 知识表示
  • 本体学 工程学 工程学

背景情况:

  • 有效的P5药物部署需要强大的沟通和语义理解,以共享医学知识.
  • 域本体学对于理解现实世界的系统至关重要,但管理它们的时间演变 (版本) 是具有挑战性的.
  • 本体论网络语言 (OWL) 是本体论的标准,但缺乏对时间意义演变的原生支持.

研究的目的:

  • 开发一种方法来实现OWL本体学的一致和验证的转换,包括版本管理.
  • 为了利用通用术语服务-发布2 (CTS2) 功能来管理本体学意义的历史演变.
  • 以阿尔茨海默氏病本体学 (ADO) 为特定的用例来应用和验证拟议的方法.

主要方法:

  • 研究了 Common Terminology Service-Release 2 (CTS2) 功能在本体学转换和版本管理中的使用.
  • 将阿尔茨海默氏病本体学 (ADO) 的元素映射到CTS2的术语资源.
  • 专注于解决代表和转换OWL构造的挑战,特别是来自限制的等价类.

主要成果:

  • 成功地将大多数阿尔茨海默氏病本体学 (ADO) 的元素映射到CTS2的术语资源中.
  • 展示了使用CTS2来管理OWL本体学的时间方面和转换的可行方法.
  • 确定了ADO元素的子集,特别是与限制相等的类别,需要进一步考虑用于映射.

结论:

  • 共同术语服务发布2 (CTS2) 可以有效地用于管理OWL本体学的演变和转型,支持医疗知识共享.
  • 拟议的方法为一致的本体学版本提供了一个框架,这对P5医学至关重要.
  • 需要进一步的研究来充分整合复杂的OWL结构,如CTS2框架内的限制等级.