Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Location and Orientation of the Heart

Location and Orientation of the Heart

The human heart, despite its modest size and weight, is an organ of remarkable strength and endurance. Roughly the size of a fist, the heart weighs between 250 and 350 grams and is nestled within the mediastinum, the medial cavity of the thorax. It extends obliquely for about 12 to 14 cm, resting on the superior surface of the diaphragm. The heart is positioned anterior to the vertebral column and posterior to the sternum, with two-thirds of its mass lying to the left of the midsternal line.

Methods of Documentation I: Source-Oriented Records

Methods of Documentation I: Source-Oriented Records

Source-oriented records, or SOR, are medical record-keeping organized by the data source. The SOR system was first developed in the mid-1900s to organize the growing patient data in hospitals and other healthcare facilities.
In an SOR, each discipline involved in patient care maintains a separate medical record section. This record-keeping method enables easy tracking of patient progress and ensures healthcare staff have access to up-to-date information.
Key Attributes include the following:

Determining Order of Reaction

Determining Order of Reaction

Rate laws describe the relationship between the rate of a chemical reaction and the concentration of its reactants. In a rate law, the rate constant k and the reaction orders are determined experimentally by observing how the rate of reaction changes as the concentrations of the reactants are changed. A common experimental approach to the determination of rate laws is the method of initial rates. This method involves measuring reaction rates for multiple experimental trials carried out using...

Determination

Determination

During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...

Exercise and Muscle Performance

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...

Pathophysiology of Cardiac Performance

Pathophysiology of Cardiac Performance

Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Scalable Digital Neuromorphic Architecture for Large-Scale Biophysically Meaningful Neural Network With Multi-Compartment Neurons.

IEEE transactions on neural networks and learning systems·2019

Same author

Optical properties and applications of molybdenum disulfide/SiO<sub>2</sub> saturable absorber fabricated by sol-gel technique.

Optics express·2019

Same author

Green and Facile Assembly of Diverse Fused <i>N</i>-Heterocycles Using Gold-Catalyzed Cascade Reactions in Water.

Molecules (Basel, Switzerland)·2019

Same author

Comparative transcriptome analysis of dioecious, unisexual floral development in Ribes diacanthum pall.

Gene·2019

Same author

The controversy of esophageal carcinosarcoma: A case report and brief review of literature.

Medicine·2019

Same author

One-Pot NBS-Promoted Synthesis of Imidazoles and Thiazoles from Ethylarenes in Water.

Molecules (Basel, Switzerland)·2019

Same journal

RETRACTED: Zhang et al. A Novel Framework for Reconstruction and Imaging of Target Scattering Centers via Wide-Angle Incidence in Radar Networks. <i>Sensors</i> 2025, <i>25</i>, 6802.

Sensors (Basel, Switzerland)·2026

Same journal

Enhancing Unsupervised Multi-Source Domain Adaptation for Person Re-Identification via Mixture of Experts and Graph-Based Relation.

Sensors (Basel, Switzerland)·2026

Same journal

Development of an Instrumented Glove for Palmar Pressure Assessment in Kayakers.

Sensors (Basel, Switzerland)·2026

Same journal

Development and Experimental Validation of an Autonomous IoT-Based Monitoring System for Real-Time Water Quality Assessment in the Amazon River.

Sensors (Basel, Switzerland)·2026

Same journal

Semi-Supervised Adversarial Learning Framework for Controller Area Network Bus Intrusion Detection.

Sensors (Basel, Switzerland)·2026

Same journal

Smart Optimization Method for Safety Signs in Innovative Manufacturing Environments Integrating Industrial Field IoT Sensors and Knowledge Graphs.

Sensors (Basel, Switzerland)·2026

See all related articles

Search research articles

Related Experiment Video

Updated: Jan 27, 2026

In Situ Monitoring of the Accelerated Performance Degradation of Solar Cells and Modules: A Case Study for CuIn,GaSe2 Solar Cells

In Situ Monitoring of the Accelerated Performance Degradation of Solar Cells and Modules: A Case Study for CuIn,GaSe2 Solar Cells

Published on: October 3, 2018

Performance in Solar Orientation Determination for Regular Pyramid Sun Sensors.

Jiang Wang¹, Yongchao Zhang², Yin Zhang³

¹School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China. rivers2000@163.com.

Sensors (Basel, Switzerland)

|March 27, 2019

Summary

This summary is machine-generated.

This study introduces a novel frequency-domain method for precise solar orientation determination in spacecraft sun sensors. The new approach effectively suppresses interference, enhancing accuracy without adding size or mass.

Keywords:

regular pyramid arrays solar orientation sun sensors

More Related Videos

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

Published on: October 18, 2017

Developing High Performance GaP/Si Heterojunction Solar Cells

Developing High Performance GaP/Si Heterojunction Solar Cells

Published on: November 16, 2018

Related Experiment Videos

Last Updated: Jan 27, 2026

In Situ Monitoring of the Accelerated Performance Degradation of Solar Cells and Modules: A Case Study for CuIn,GaSe2 Solar Cells

In Situ Monitoring of the Accelerated Performance Degradation of Solar Cells and Modules: A Case Study for CuIn,GaSe2 Solar Cells

Published on: October 3, 2018

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

Published on: October 18, 2017

Developing High Performance GaP/Si Heterojunction Solar Cells

Developing High Performance GaP/Si Heterojunction Solar Cells

Published on: November 16, 2018

Area of Science:

Spacecraft instrumentation
Attitude determination and control systems
Optical sensing technologies

Background:

Non-planar sun sensors utilize existing components to determine solar orientation, minimizing spacecraft size and mass.
Current limitations in accuracy stem from insufficient performance assessments of interference suppression techniques.

Purpose of the Study:

To develop a novel frequency-domain method for accurate solar orientation determination using regular pyramid sun sensors.
To establish formulations for evaluating solar azimuth and elevation angle errors in this new method.
To analyze the relationship between interference, sensor geometry, and orientation accuracy.

Main Methods:

Development of a frequency-domain solar orientation determination method for regular pyramid sun sensors.
Establishment of two error evaluation formulations for solar azimuth and elevation angles.
Mathematical analysis of interference spectrum, array geometry, solar irradiance, and angle errors.
Validation through simulations and field experiments.

Main Results:

A new frequency-domain method for solar orientation determination was successfully developed.
Formulations for error evaluation in solar azimuth and elevation angles were established.
The mathematical relationship between interference sources and orientation error was elucidated for the first time.
Internal detection system interference can be completely suppressed, and constant interference eliminated in azimuth estimation.

Conclusions:

The proposed frequency-domain method significantly enhances solar orientation accuracy in spacecraft.
The developed error formulations provide a robust tool for performance assessment and sensor design.
Interference suppression capabilities are mathematically defined, improving understanding of sensor limitations and performance.