Your browser does not fully support modern features. Please upgrade for a smoother experience.
Subject:
All Disciplines Arts & Humanities Biology & Life Sciences Business & Economics Chemistry & Materials Science Computer Science & Mathematics Engineering Environmental & Earth Sciences Medicine & Pharmacology Physical Sciences Public Health & Healthcare Social Sciences
Sort by:
Most Viewed Latest Alphabetical (A-Z) Alphabetical (Z-A)
Filter:
All Topic Review Biography Peer Reviewed Entry Video Entry
Topic Review
Electrospun Nanofibers
Electrospun nanofibers have become the most promising building blocks for future high-performance electronic devices because of the advantages of larger specific surface area, higher porosity, more flexibility, and stronger mechanical strength over conventional film-based materials.
  • 2.6K
  • 09 May 2022
Topic Review
Gridshell Nodes
Gridshells are shells where the structural members form a grid of linear elements rather than a continuous surface. Nodes are essential parts of a gridshell regarding structural performance, assembly and visual appearance. Due to the many decisions to be made when designing gridshells, including global shape, topology, cross-sections, material selection and node designs, detailed structural analysis of gridshell nodes is often left to later stages of the project. Getting feedback on the structural performance of gridshell nodes is inefficient due to software changes and geometry conversion, and it is hard to find tools that support early integration between architectural design and structural design. 
  • 2.6K
  • 08 Jul 2022
Topic Review
Physiotherapy Interventions in the Elderly with Neurological Disorders
Physiotherapy deals with the support and promotion of physical recovery after physical injuries or neurological events and conditions. The degeneration of the neuromuscular system over time is an inevitable part of the aging process, a condition that makes physical therapy necessary in the elderly, especially those with additional neurological disorders (NDs). In this context, physiotherapists often have to evaluate and treat elderly patients with loss of cognitive function from aging as well as balance disorders such as cerebral palsy (and movement disorders), degenerative diseases such as Parkinson’s disease, multiple sclerosis, Alzheimer’s disease, polyneuropathy (e.g., diabetic neuropathy or Guillain–Barré syndrome), peripheral nerve injuries, and acute cases such as patients recovering from stroke and, recently, elders recovering from COVID-19. Most of the therapeutic approaches for neurological rehabilitation include basic elements such as promoting normal movement, controlling abnormal muscle tone, and facilitating function. Furthermore, neurological physiotherapy adopts a problem-based individualized approach, as determined from a thorough evaluation of a patient’s health status. Therefore, the treatment goals for a person recovering from a stroke may be vastly different among patients with similar NDs but different health history. Thus, the treatment approaches used depend on the individual patient and their symptoms and physiotherapy’s rehabilitation goals, so a variety of tools and standard approaches can be applied.
  • 2.6K
  • 10 Aug 2022
Topic Review
Functional Coatings
Coating materials have gained researchers’ interest, finding applications in different areas such as antimicrobial coatings for biomedical applications, coatings for increasing the shelf-life of commercial products, or coatings for the conservation of cultural heritage artifacts. 
  • 2.6K
  • 21 Sep 2022
Topic Review
Binary Adder
An adder, or summer, is a digital circuit that performs addition of numbers. In many computers and other kinds of processors adders are used in the arithmetic logic units (ALUs). They are also used in other parts of the processor, where they are used to calculate addresses, table indices, increment and decrement operators and similar operations. Although adders can be constructed for many number representations, such as binary-coded decimal or excess-3, the most common adders operate on binary numbers. In cases where two's complement or ones' complement is being used to represent negative numbers, it is trivial to modify an adder into an adder–subtractor. Other signed number representations require more logic around the basic adder.
  • 2.6K
  • 30 Nov 2022
Topic Review
Barriers of Circular Economy in Construction Industry
To facilitate the adoption of the circular economy (CE) in the architecture, engineering and construction (AEC) sector, some authors have demonstrated the potential of recent designs that take into account the sustainable management of an asset’s end-of-life (EOL), providing an alternative to the dominant designs that end with demolition. Eighteen approaches related to prefabrication, design for change, design for deconstruction, reverse logistics, waste management and closed-loop systems were found. Researchers has assessed the barriers to those 18 approaches identified in the literature.
  • 2.6K
  • 07 Dec 2021
Topic Review
Kerberos (Protocol)
Kerberos (/ˈkɜːrbərɒs/) is a computer-network authentication protocol that works on the basis of tickets to allow nodes communicating over a non-secure network to prove their identity to one another in a secure manner. Its designers aimed it primarily at a client–server model, and it provides mutual authentication—both the user and the server verify each other's identity. Kerberos protocol messages are protected against eavesdropping and replay attacks. Kerberos builds on symmetric-key cryptography and requires a trusted third party, and optionally may use public-key cryptography during certain phases of authentication. Kerberos uses UDP port 88 by default. The protocol was named after the character Kerberos (or Cerberus) from Greek mythology, the ferocious three-headed guard dog of Hades.
  • 2.6K
  • 25 Oct 2022
Topic Review
EPR Effect for Cancer Treatment
The EPR effect was first discovered by Maeda and colleagues in solid murine tumors. The polymer-drug conjugates were i.v. administered, and 10-to-100-fold higher concentrations were achieved relative to free drug administration. The concentration of nanodrugs builds up in tumors due to the EPR effect, reaching several times higher than that of plasma due to the lack of lymphatic drainage. 
  • 2.6K
  • 23 Jun 2021
Topic Review
Nanogenerators for Green Energy Harvesting
Natural sources of green energy include sunshine, water, biomass, geothermal heat, and wind. These energies are alternate forms of electrical energy that do not rely on fossil fuels. Green energy is environmentally benign, as it avoids the generation of greenhouse gases and pollutants. Various systems and equipment have been utilized to gather natural energy. Nanogenerators have recently emerged as an alterna- tive technique for collecting energy from both natural and artificial sources, with significant benefits such as light weight, low-cost production, simple operation, easy signal processing, and low-cost materials.
  • 2.6K
  • 24 Aug 2022
Topic Review
Hyperbolic Function
In mathematics, hyperbolic functions are analogs of the ordinary trigonometric functions defined for the hyperbola rather than on the circle: just as the points (cos t, sin t) form a circle with a unit radius, the points (cosh t, sinh t) form the right half of the equilateral hyperbola. Hyperbolic functions occur in the solutions of many linear differential equations (for example, the equation defining a catenary), of some cubic equations, in calculations of angles and distances in hyperbolic geometry, and of Laplace's equation in Cartesian coordinates. Laplace's equations are important in many areas of physics, including electromagnetic theory, heat transfer, fluid dynamics, and special relativity. The basic hyperbolic functions are: from which are derived: corresponding to the derived trigonometric functions. The inverse hyperbolic functions are: The hyperbolic functions take a real argument called a hyperbolic angle. The size of a hyperbolic angle is twice the area of its hyperbolic sector. The hyperbolic functions may be defined in terms of the legs of a right triangle covering this sector. In complex analysis, the hyperbolic functions arise as the imaginary parts of sine and cosine. The hyperbolic sine and the hyperbolic cosine are entire functions. As a result, the other hyperbolic functions are meromorphic in the whole complex plane. By Lindemann–Weierstrass theorem, the hyperbolic functions have a transcendental value for every non-zero algebraic value of the argument. Hyperbolic functions were introduced in the 1760s independently by Vincenzo Riccati and Johann Heinrich Lambert. Riccati used Sc. and Cc. (sinus/cosinus circulare) to refer to circular functions and Sh. and Ch. (sinus/cosinus hyperbolico) to refer to hyperbolic functions. Lambert adopted the names but altered the abbreviations to what they are today. The abbreviations sh, ch, th, cth are also at disposition, their use depending more on personal preference of mathematics of influence than on the local language.
  • 2.6K
  • 10 Nov 2022
Topic Review
L-Citrulline
L-citrulline (CIT) is an organic compound and a non-essential amino acid, and the body can synthesize it endogenously. Diet is a poor source of CIT and endogenous synthesis the its main source in the body. Watermelon is the principal source of that amino acid in the diet; the name citrulline comes from Citrullus lanatus (Thunb.), the scientific name for watermelon. CIT concentration in watermelon depends on the type of cultivir and usually ranges between 0.7 and 3.6 g/kg of fresh weight. CIT is present in both the flesh and in the ring.
  • 2.6K
  • 06 May 2021
Topic Review
Benefits of Green Building Implementation
A green building is often defined as an energy-saving building, ecological building or sustainable building. Green buildings have higher commercial value compared to traditional buildings, due to the perceived low carbon emissions, energy savings, and maximized economic benefits throughout the life cycle.
  • 2.6K
  • 15 Nov 2022
Topic Review
GVL Production with Levulinic Acid
Levulinic acid (LA) is considered as one of the “Top 10” building blocks for future bio-refineries as proposed by the US Department of Energy. It is  one of the most important platform molecules for the production of fine chemicals and fuels based on its compatibility with existing processes, market economics, and industrial ability to serve as a platform for the synthesis of important derivatives. Hydrogenation of LA to produce γ-valerolactone (GVL) is an active area of research due to the potential of GVL to be used as a biofuel in its own right and for its subsequent transformation into hydrocarbon fuels. This paper contains a new design for a simple, cost effective, and safe hydrogenation reactor for the transformation of levulinic acid to γ-valerolactone (GVL) by utilizing high boiling point organic fluid. The hydrogenation reactor is composed of a heating source—organic fluid (called “DOWTHERM A” or “thermex”) and the catalytic reactor. The advantages of high boiling temperature fluids, along with advances in hydrocracking and reforming technologies driven by the oil and gas industries, make the organic concept more suitable and safer (water coming in contact with liquid metal is well understood in the metallurgical industry to be a steam explosion hazard) for heating the hydrogenation reactor. COMSOL multi-physics software version 4.3b was applied in this work and simultaneously solves the continuity, Navier-Stokes (fluid flow), energy (heat transfer), and diffusion with chemical reaction kinetics equations. It was shown that the heat flux supplied by the DOWTHERM A organic fluid could provide the necessary heat flux required for maintaining the hydrogenation process. It was found that the mass fractions of hydrogen and levulinic acid decreased along the reactor axis. The GVL mass fraction increased along the reactor axis.
  • 2.6K
  • 30 Oct 2020
Topic Review
Therapeutic Approach of Flavonoid
Flavonoids are one of the most diverse families of bioactive phytochemicals, with over 9000 different compounds. According to IUPAC Recommendations (2017), the term “flavonoid” refers to compounds that have the basic structure of phenyl-substituted propylbenzene derivatives with C15 skeleton, C16 skeleton, and flavonolignans with C6–C3 lignan precursors. Flavonoids are divided into six subclasses; isoflavones, flavones, flavanols, flavonols, flavanones, and anthocyanins, are abundant in plants and their metabolic routes have been thoroughly explored using biochemical and molecular approaches.
  • 2.6K
  • 10 Nov 2021
Topic Review
Biodegradable Waste and Degraded Soil
Soil degradation is the modification of its physical, chemical and biological properties that worsen the biological activity of the environment, with particular emphasis on food production, water quality, ecosystem services, flooding, eutrophication, biodiversity and carbon stock shrinkage. Soil degradation has many forms and genesis: (i) geotechnical soil degradation caused by deformation of the relief resulting from the activities of opencast and underground mining as well as construction (including road, rail and water). This form of soil degradation covers the entire territory, but the greatest damage should be noted in the areas of high concentration of the mining industry and in large urban agglomerations.
  • 2.6K
  • 25 Jan 2022
Topic Review
Manufacturing Methods of Phase Change Materials Microcapsules
Thermal energy storage (TES) has been identified by many researchers as one of the cost-effective solutions for not only storing excess or/wasted energy, but also improving systems’ reliability and thermal efficiency. Among TES, phase change materials (PCMs) are gaining more attention due to their ability to store a reasonably large quantity of heat within small temperature differences. Encapsulation is the cornerstone in expanding the applicability of the PCMs. Microencapsulation is a proven, viable method for containment and retention of PCMs in tiny shells. Currently, there are numerous methods available for synthesis of mPCMs, each of which has its own advantages and limitations.
  • 2.6K
  • 22 Jul 2022
Topic Review
Chinese Emperors Family Tree (Middle)
The following is a family tree of China emperors (420-1279), from the Northern and Southern dynasties period, of first half of the fifth century AD, until the conquest of China by the Mongols under Kublai Khan, and the end of the Southern Song dynasty in 1279. Chinese emperors family tree (ancient) → Chinese emperors family tree (early) → Chinese emperors family tree (middle) → Chinese emperors family tree (late)
  • 2.6K
  • 01 Nov 2022
Topic Review
Pillsbury Winthrop Shaw Pittman
Template:Infobox Law Firm Pillsbury is a full-service law firm with an industry focus on the energy and natural resources, financial services including financial institutions, real estate and construction, technology, and travel and hospitality. Based in the world's major financial, technology and energy centers, Pillsbury counsels clients on global business, regulatory and litigation matters. It has approximately 700 attorneys operating from 20 offices in the U.S., London, Asia, and the Middle East. The firm has connections to the two main political parties in the United States. The law firm's two oldest predecessor firms were founded in New York City in 1868 and in San Francisco in 1874, following the California Gold Rush. The San Francisco firm helped create a number of new West Coast businesses including Chevron and Pacific Bell (now known as AT&T). In the 2000s, Pillsbury has become an advocate of labor outsourcing as a means of firms cutting costs by offering services to both buyers and providers of outsourcing services.
  • 2.6K
  • 15 Nov 2022
Topic Review
Analysis Method of Heavy Metals in Organic Fertilizers
Heavy metals in organic fertilizers pose a risk to the agricultural ecosystem. The environmental risk of heavy metals depends not only on the total amount but also on the speciation. Hence, more information on heavy metals speciation in organic fertilizers is needed to avoid adverse effect. The speciation information of heavy metals is usually obtained by the single-extraction method and sequential extraction method. Common heavy metals that have received attention include Cu, Zn, Pb, Cd, Cr, Hg and As. 
  • 2.6K
  • 26 Dec 2022
Topic Review
Degradation and Life Prediction of Polyethylene
Polyethylene is one of the most significant and useful polymers that has been extensively studied for use as a plastic material. The benefits of using polyethylene as a commercial plastic material include its excellent mechanical properties, good flexibility, good chemical resistance, lightweight properties, good thermal stability, and high-cost performance. The piping sector has been impacted by the trend of replacing steel with plastic during the past, resulting in the steady replacement of metal-based pipes with plastic pipes. Polyethylene pipes are the most commonly utilized among them. Consider the case of high-density polyethylene pipes. Its market worth was USD 15.975 billion in 2018, and 9.283 million tons were consumed each year. The service life of polyethylene pipes will not be less than 50 years, and it will continue to grow at a rate of at least 5% annually in the upcoming years.
  • 2.6K
  • 10 Mar 2023
  • Page
  • of
  • 2728
Featured Entry Collections
>>

Featured Reprints

>>
Encyclopedia of Digital Society, Industry 5.0 and Smart City
Encyclopedia of Engineering
Encyclopedia of Social Sciences
Encyclopedia of Medieval Royal Iconography
Academic Video Service
Feedback