Filtering by
![135616-Thumbnail Image.png](https://d1rbsgppyrdqq4.cloudfront.net/s3fs-public/styles/width_400/public/2021-05/135616-Thumbnail%20Image.png?versionId=Lz_6KcGhKAERNzaMXuAA_khiuhNTh5u9&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIASBVQ3ZQ42ZLA5CUJ/20240530/us-west-2/s3/aws4_request&X-Amz-Date=20240530T154126Z&X-Amz-SignedHeaders=host&X-Amz-Expires=120&X-Amz-Signature=820e4546371bf145c2d216582a16b4056f448383c79bf92dc028aed2ec376e46&itok=fGWns_6m)
![137273-Thumbnail Image.png](https://d1rbsgppyrdqq4.cloudfront.net/s3fs-public/styles/width_400/public/2021-05/137273-Thumbnail%20Image.png?versionId=Hu0K4Z1UUNTw5dQPNolgpjvNAy5jiqLb&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIASBVQ3ZQ42ZLA5CUJ/20240606/us-west-2/s3/aws4_request&X-Amz-Date=20240606T101147Z&X-Amz-SignedHeaders=host&X-Amz-Expires=120&X-Amz-Signature=cda817c6ebc99ba1eabf93a5773e0c75d207e873997ad0f63b544588498d75ea&itok=E-z8Q_a2)
![136377-Thumbnail Image.png](https://d1rbsgppyrdqq4.cloudfront.net/s3fs-public/styles/width_400/public/2021-05/136377-Thumbnail%20Image.png?versionId=p_Ti0vGqEnMl.tQkInTZqTNJfLf.Afrq&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIASBVQ3ZQ42ZLA5CUJ/20240615/us-west-2/s3/aws4_request&X-Amz-Date=20240615T083032Z&X-Amz-SignedHeaders=host&X-Amz-Expires=120&X-Amz-Signature=0fbe5f89c06bd1e345eb84c8f00a3cd6c9dbcc088e7e8a648e6fa1a0c8702abb&itok=PPEMWcLm)
![136226-Thumbnail Image.png](https://d1rbsgppyrdqq4.cloudfront.net/s3fs-public/styles/width_400/public/2021-05/136226-Thumbnail%20Image.png?versionId=Ly1llGVLDgHpNUj7yi9Web_R.Z7RKOsU&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIASBVQ3ZQ42ZLA5CUJ/20240605/us-west-2/s3/aws4_request&X-Amz-Date=20240605T091254Z&X-Amz-SignedHeaders=host&X-Amz-Expires=120&X-Amz-Signature=b6234ef2d5b7926afd08b5a607845150a3f9f338c5914232073cc419a498bd31&itok=g3mlIzwP)
![148448-Thumbnail Image.png](https://d1rbsgppyrdqq4.cloudfront.net/s3fs-public/styles/width_400/public/2021-07/148448-Thumbnail%20Image.png?versionId=8ZUn4wTFSSt_zViQQ791bnihncHFqwDw&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIASBVQ3ZQ42ZLA5CUJ/20240616/us-west-2/s3/aws4_request&X-Amz-Date=20240616T231205Z&X-Amz-SignedHeaders=host&X-Amz-Expires=120&X-Amz-Signature=9431de1d44c6a8c3216b86bc87855e851feba31d6d32b5dba8c584431abc78f0&itok=_Sq9PcJE)
This paper discusses the theoretical approximation and attempted measurement of the quantum <br/>force produced by material interactions though the use of a tuning fork-based atomic force microscopy <br/>device. This device was built and orientated specifically for the measurement of the Casimir force as a <br/>function of separation distance using a piezo actuator for approaching and a micro tuning fork for the <br/>force measurement. This project proceeds with an experimental measurement of the ambient Casmir force <br/>through the use of a tuning fork-based AFM to determine its viability in measuring the magnitude of the <br/>force interaction between an interface material and the tuning fork probe. The ambient measurements <br/>taken during the device’s development displayed results consistent with theoretical approximations, while<br/>demonstrating the capability to perform high-precision force measurements. The experimental results<br/>concluded in a successful development of a device which has the potential to measure forces of <br/>magnitude 10−6 to 10−9 at nanometric gaps. To conclude, a path to material analysis using an approach <br/>stage, alternative methods of testing, and potential future experiments are speculated upon.
![148495-Thumbnail Image.png](https://d1rbsgppyrdqq4.cloudfront.net/s3fs-public/styles/width_400/public/2021-07/148495-Thumbnail%20Image.png?versionId=rQL7u54rhbnCV.i811sx60kEHnkpM5ON&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIASBVQ3ZQ42ZLA5CUJ/20240617/us-west-2/s3/aws4_request&X-Amz-Date=20240617T033636Z&X-Amz-SignedHeaders=host&X-Amz-Expires=120&X-Amz-Signature=7b391ec3e50eb0a4fc69d93ed27bc0dd007b5acda0c9f5fe3247e4c2c8591881&itok=G-fkc8TG)
Tunable Near-Field Radiative Heat Transfer Exceeding Blackbody Limit with Vanadium Dioxide Thin Film
This paper investigates near-field thermal radiation as the primary source of heat transfer between two parallel surfaces. This radiation takes place extremely close to the heated surfaces in study so the experimental set-up to be used will be done at the nanometer scale. The primary theory being investigated is that near-field radiation generates greater heat flux that conventional radiation governed by Planck’s law with maximum for blackbodies. Working with a phase shift material such as VO2 enables a switch-like effect to occur where the total amount of heat flux fluctuates as VO2 transitions from a metal to an insulator. In this paper, the theoretical heat flux and near-field radiation effect are modeled for a set-up of VO2 and SiO2 layers separated by different vacuum gaps. In addition, a physical experimental set-up is validated for future near-field radiation experiments.
![135861-Thumbnail Image.png](https://d1rbsgppyrdqq4.cloudfront.net/s3fs-public/styles/width_400/public/2021-05/135861-Thumbnail%20Image.png?versionId=vZGLmE1yFLd08ibPRvLNEeDgUXhmB17k&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIASBVQ3ZQ42ZLA5CUJ/20240614/us-west-2/s3/aws4_request&X-Amz-Date=20240614T202512Z&X-Amz-SignedHeaders=host&X-Amz-Expires=120&X-Amz-Signature=5ceaa77a934e35910684f0abddae277dda5a3dad2e6fc2bb93843d9586ef095b&itok=-ioQQqZz)
![130351-Thumbnail Image.png](https://d1rbsgppyrdqq4.cloudfront.net/s3fs-public/styles/width_400/public/2021-04/130351-Thumbnail%20Image.png?versionId=tBT5SGBej18LnPsgZCWNj9cuqqy9tSah&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIASBVQ3ZQ42ZLA5CUJ/20240530/us-west-2/s3/aws4_request&X-Amz-Date=20240530T155452Z&X-Amz-SignedHeaders=host&X-Amz-Expires=120&X-Amz-Signature=f1561b5b36be3bd89fcc3e1309cd79b4ab4c89d3dc3992aecaa6796863458c19&itok=ijEt79V-)
Viral protein U (Vpu) is a type-III integral membrane protein encoded by Human Immunodeficiency Virus-1 (HIV- 1). It is expressed in infected host cells and plays several roles in viral progeny escape from infected cells, including down-regulation of CD4 receptors. But key structure/function questions remain regarding the mechanisms by which the Vpu protein contributes to HIV-1 pathogenesis. Here we describe expression of Vpu in bacteria, its purification and characterization. We report the successful expression of PelB-Vpu in Escherichia coli using the leader peptide pectate lyase B (PelB) from Erwinia carotovora. The protein was detergent extractable and could be isolated in a very pure form. We demonstrate that the PelB signal peptide successfully targets Vpu to the cell membranes and inserts it as a type I membrane protein. PelB-Vpu was biophysically characterized by circular dichroism and dynamic light scattering experiments and was shown to be an excellent candidate for elucidating structural models.
![131672-Thumbnail Image.png](https://d1rbsgppyrdqq4.cloudfront.net/s3fs-public/styles/width_400/public/2021-07/131672-Thumbnail%20Image.png?versionId=7A.TKGqV3CCDPmBmlMGfzLsIn4SvsB16&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIASBVQ3ZQ42ZLA5CUJ/20240615/us-west-2/s3/aws4_request&X-Amz-Date=20240615T150904Z&X-Amz-SignedHeaders=host&X-Amz-Expires=120&X-Amz-Signature=34986f5c730bcd61c675556ae7c93d7b39bc82cc296ab19b99b09c355ea3fb4d&itok=myaw2amj)
![133164-Thumbnail Image.png](https://d1rbsgppyrdqq4.cloudfront.net/s3fs-public/styles/width_400/public/2021-07/133164-Thumbnail%20Image.png?versionId=Dk_gM8ib.pDZJMC9ybq_udvcJKOErQi6&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIASBVQ3ZQ42ZLA5CUJ/20240616/us-west-2/s3/aws4_request&X-Amz-Date=20240616T024737Z&X-Amz-SignedHeaders=host&X-Amz-Expires=120&X-Amz-Signature=d41aad477f7a8093e089359305f53d8ad080d0e7d547b066fd6f6536c117f158&itok=Ury4eGAt)