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Related Concept Videos

Second Order systems II01:18

Second Order systems II

406
In an underdamped second-order system, where the damping ratio ζ is between 0 and 1, a unit-step input results in a transfer function that, when transformed using the inverse Laplace method, reveals the output response. The output exhibits a damped sinusoidal oscillation, and the difference between the input and output is termed the error signal. This error signal also demonstrates damped oscillatory behavior. Eventually, as the system reaches a steady state, the error diminishes to zero.
406
Characteristics of Practical Op Amps01:16

Characteristics of Practical Op Amps

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A difference amplifier, a crucial component in numerous electronic devices, ideally amplifies only the difference-mode signal, which is the difference between two input signals. However, in practical circuits, the output voltage depends on both the differential gain and the common-mode gain.
The ratio of differential gain to the common-mode gain is defined as the common-mode rejection ratio (CMRR). This ratio quantifies the ability of operational amplifiers (op-amps) to reject common-mode...
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Theoretical Foundations of Nursing Practice

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Theories play an essential role in organizing patient care. Theories refer to a proposed or followed belief, policy, or procedure that is the basis for action. Nursing theories are knowledge-based concepts that guide nurses' actions, influence nursing education and practice, and allow nurses to care for their patients.
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Equivalent Circuits for Practical Transformers01:28

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The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
In a practical transformer, each winding exhibits resistance and leakage reactance. The...
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First Order Systems01:21

First Order Systems

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First-order systems, such as RC circuits, are foundational in understanding dynamic systems due to their straightforward input-output relationship. Analyzing their responses to different input functions under zero initial conditions reveals significant insights into system behavior.
When a first-order system is subjected to a unit-step input, its response is characterized by its transfer function. By applying the Laplace transform of the unit-step input to the transfer function, expanding the...
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Second Order systems I01:20

Second Order systems I

599
A servo system exemplifies a second-order system, featuring a proportional controller and load elements that ensure the output position aligns with the input position. The relationship between these components is described by a second-order differential equation. Applying the Laplace transform under zero initial conditions yields the transfer function, showing how inputs are converted to outputs in the system.
By reinterpreting the system, one can derive the closed-loop transfer function, which...
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Skin Biopsy for Diagnosing Discoid Lupus Erythematosus
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A practical guide to systemic lupus erythematosus

T J Lehman1

  • 1Division of Pediatric Rheumatology, Hospital for Special Surgery, New York, New York, USA.

Pediatric Clinics of North America
|October 1, 1995
PubMed
Summary

Systemic lupus erythematosus (SLE) in children can present subtly, mimicking other conditions. Early diagnosis and appropriate care, including advanced immunosuppressive therapies, significantly improve outcomes and survival for pediatric SLE patients.

Area of Science:

  • Pediatric Rheumatology
  • Immunology
  • Systemic Autoimmune Diseases

Background:

  • Systemic lupus erythematosus (SLE) is a complex autoimmune disease characterized by immune complex deposition, leading to diverse clinical presentations in children.
  • Pediatric SLE can manifest acutely with fever, rash, and hematuria, or chronically as fatigue, potentially being misdiagnosed as behavioral issues like 'school phobia'.
  • While infrequent, mild pediatric SLE cases are more common than previously thought, highlighting the need for physician awareness and timely diagnosis.

Purpose of the Study:

  • To underscore the importance of recognizing varied presentations of pediatric SLE.
  • To review advancements in understanding SLE pathogenesis, including genetic and environmental factors.
  • To discuss the evolving therapeutic landscape for active pediatric SLE.

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Main Methods:

  • Review of clinical presentations and diagnostic considerations for pediatric SLE.
  • Analysis of recent advancements in understanding SLE pathogenesis.
  • Evaluation of current and emerging immunosuppressive treatment strategies for pediatric SLE.

Main Results:

  • Improved understanding of SLE genetics and environmental triggers over the last decade.
  • Refined use of immunosuppressive agents like cyclophosphamide has enhanced quality of life and survival in children with severe SLE.
  • Timely diagnosis and appropriate management are crucial for positive patient outcomes.

Conclusions:

  • Pediatric SLE requires heightened clinical suspicion due to its varied and sometimes subtle manifestations.
  • Advances in understanding pathogenesis and therapeutic interventions offer a brighter future for children with SLE.
  • Continued research into long-term safety and efficacy of immunosuppressive regimens is warranted.