The Mac @TheMac
08 December, 03:39
A seed crystal is a small crystal that is used as a base to grow a large single crystal. Without a seed, crystals form slowly from random intermolecular interactions. When the seed is placed in a saturated or supersaturated solution it acts as a nucleation site. This decreases the time needed to grow a crystal and directs growth to a single region. Here’s how to grow a seed crystal and how to use one to get a large, perfect crystal.

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I AM Cedaina donated @CDDanford
08 December, 03:47
In response The Mac to his Publication
Crystal recipes ☺️
https://www.thoughtco.com/...

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The Mac @TheMac
09 December, 12:19
In response I AM Cedaina to her Publication

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The Mac @TheMac
09 December, 12:21
In response The Mac to his Publication

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The Mac @TheMac
09 December, 12:25
In response The Mac to his Publication
Neurostimulation has proved to be an effective method for the restoration of visual perception lost due to retinal diseases. However, the clinically available retinal neurostimulation method is based on invasive electrodes, making it a high-cost and high-risk procedure. Recently, ultrasound has been demonstrated to be an effective way to achieve noninvasive neurostimulation. In this work, a novel racing array transducer with a contact lens shape is proposed for ultrasonic retinal stimulation. The transducer is flexible and placed outside the eyeball, similar to the application of a contact lens. Ultrasound emitted from the transducer can reach the retina without passing through the lens, thus greatly minimizing the acoustic absorption in the lens.

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The Mac @TheMac
09 December, 12:26
In response The Mac to his Publication
The discretized Rayleigh–Sommerfeld method was employed for the acoustic field simulation, and patterned stimulation was achieved. A 5 MHz racing array transducer with different element numbers was simulated to optimize the array configuration. The results show that a 512-element racing array is the most appropriate configuration considering the necessary tradeoff between the element number and the stimulation resolution. The stimulation resolution at a focus of 24 mm is about 0.6 mm. The obtained results indicate that the proposed racing array design of the ultrasound transducer can improve the feasibility of an ultrasound retinal prosthesis.

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The Mac @TheMac
09 December, 12:28
In response The Mac to his Publication
The new coronavirus behind the pandemic causes a respiratory illness called COVID-19. Its most common symptoms are a fever, coughing, and breathing problems. Rarely, it also can cause an eye infection called conjunctivitis.

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The Mac @TheMac
09 December, 12:31
In response The Mac to his Publication
UV-C has promise as a means of environmental control for SARS-CoV-2. To understand the potential of UV-C as a tool in the pandemic, we must first understand the effect of UV-C on SARS-CoV-2 and the necessary operating time to reduce the bioburden of SARS-CoV-2 in the environment. Herein, we present the results of a laboratory study that assessed the efficacy of full-germicidal-spectrum UV-C from a pulsed-xenon source (PX-UV) on SARS-CoV-2 on hard surfaces and N95 respirators.

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The Mac @TheMac
09 December, 12:33
In response The Mac to his Publication
We found that PX-UV significantly reduces SARS-CoV-2 on hard surfaces and N95 respirators. With the potential to rapidly disinfectant environmental surfaces and N95 respirators, PX-UV devices are a promising technology for the reduction of environmental and PPE bioburden.

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The Mac @TheMac
09 December, 12:34
In response The Mac to his Publication
In these experiments, specific light sources were shown to activate the HIV gene and/or promote viral replication. UVC was the most potent activator. UVB, sunlight, and PUVA were also capable of activating HIV, albeit to lesser degrees (1–5).

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The Mac @TheMac
09 December, 12:36
In response The Mac to his Publication
Also known as “zero-dimensional electronic structures,” quantum dots are unique in that their semiconductor energy levels can be tailored by simply altering size, shape and charge potential. These energy levels result in distinct color identifications for different-sized quantum dots.

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The Mac @TheMac
09 December, 12:37
In response The Mac to his Publication
A microwave cavity or radio frequency (RF) cavity is a special type of resonator, consisting of a closed (or largely closed) metal structure that confines electromagnetic fields in the microwave region of the spectrum. The structure is either hollow or filled with dielectric material. The microwaves bounce back and forth between the walls of the cavity. At the cavity's resonant frequencies they reinforce to form standing waves in the cavity. Therefore, the cavity functions similarly to an organ pipe or sound box in a musical instrument, oscillating preferentially at a series of frequencies, its resonant frequencies. Thus it can act as a bandpass filter, allowing microwaves of a particular frequency to pass while blocking microwaves at nearby frequencies.

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Only people mentioned by TheMac in this post can reply
The Mac @TheMac
09 December, 12:40
In response The Mac to his Publication
A microwave cavity acts similarly to a resonant circuit with extremely low loss at its frequency of operation, resulting in quality factors (Q factors) up to the order of 106, compared to 102 for circuits made with separate inductors and capacitors at the same frequency. They are used in place of resonant circuits at microwave frequencies, since at these frequencies discrete resonant circuits cannot be built because the values of inductance and capacitance needed are too low. They are used in oscillators and transmitters to create microwave signals, and as filters to separate a signal at a given frequency from other signals, in equipment such as radar equipment, microwave relay stations, satellite communications, and microwave ovens.

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The Mac @TheMac
09 December, 12:42
In response The Mac to his Publication
Resonance describes the phenomenon of increased amplitude that occurs when the frequency of a periodically applied force (or a Fourier component of it) is equal or close to a natural frequency of the system on which it acts. When an oscillating force is applied at a resonant frequency of a dynamic system, the system will oscillate at a higher amplitude than when the same force is applied at other, non-resonant frequencies.

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