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相关概念视频

Variance01:15

Variance

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The deviations show how spread out the data are about the mean. A positive deviation occurs when the data value exceeds the mean, whereas a negative deviation occurs when the data value is less than the mean. If the deviations are added, the sum is always zero. So one cannot simply add the deviations to get the data spread. By squaring the deviations, the numbers are made positive; thus, their sum will also be positive.
The standard deviation measures the spread in the same units as the data....
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Finishing Concrete01:18

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Concrete finishing starts immediately after the concrete has been placed and consolidated. The initial step, screeding, involves leveling the concrete surface by removing excess material to flush it with the formwork's top. Following this, bull float or darby are employed to smooth the surface further, effectively lower high spots, fill low areas, and ensure larger aggregate particles are embedded within the concrete. This preparation is critical before the appearance of bleed water, as its...
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Angle Closure Glaucoma: Treatment01:28

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Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
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Torque01:10

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Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
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Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
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ortho–para-Directing Deactivators: Halogens01:24

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Halogens are ortho–para directors. They are more electronegative than carbon. Therefore, as ring substituents, they can withdraw electrons through the inductive effect and deactivate the aromatic ring towards electrophilic substitution. Halogens also have an electron-donating resonance effect on the ring, which influences the orientation of the incoming electrophile. If an electrophile attacks at the ortho or the para position, the halogen donates electrons and stabilizes the intermediate...
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标题 标题 标题

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    这项研究发现,用于治疗骨骨折的跨口腔和下口腔方法之间的结果没有显著差异. 对于这些常见的口腔和面外科手术病例的治疗决定应该是个性化的.

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    科学领域:

    • 口腔和牙面部外科手术
    • 整形手术 整形手术 整形手术
    • 创伤外科 手术 创伤外科

    背景情况:

    • 状骨折很常见,但治疗方法缺乏明显的优势.
    • 软组织修复骨折的软组织方法各不相同,需要对结果进行比较.
    • 确定骨骨折的最佳手术技术对于患者的康复至关重要.

    研究的目的:

    • 为了比较跨口腔与下下下软组织方法的结果,用于骨骨折治疗.
    • 评估骨骨折的开放缩小和内部固定后的功能和美学结果.
    • 为了确定一个外科手术方法是否为骨骨折提供了更好的结果.

    主要方法:

    • 通过开放式缩小和内部固定 (2012-2022) 治疗的32名骨折患者的回顾性图表审计.
    • 对14名患者进行面对面评估,评估痕满意度,患者满意度,化品结果和弗雷综合征.
    • 使用曼·惠特尼U和千平方/费舍尔精确试验 (p < 0.05) 的统计比较.

    主要成果:

    • 对于外科手术结果,通过口腔和下下门的方法之间没有观察到统计学上显著的差异.
    • 无论是功能 (例如,最大的间开口) 还是美学结果,都没有显示出任何一种方法的明显优势.
    • 长期跟踪 (1-7年) 没有显示两种手术方法之间的差异性益处.

    结论:

    • 对于骨骨折,跨口腔和下口方法之间的选择应该是个性化的.
    • 外科医生的偏好,骨折位置和骨折复杂性是选择治疗的关键因素.
    • 目前的证据不支持一种普遍优越的软组织方法来修复骨折.