The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Electrophoregrams generated after the electrophoresis experiment can be evaluated by eye, using simple measurement tools. A basic strip or spot densitometer and a ruler can provide data that are adequate for some purposes. More detailed analysis requires more sophisticated measurement tools. We may need to know the molecular weights and proportional purities or abundances of various compounds distributed...
New technology is needed to counter the growing threat of chemical, biological, radiological, nuclear, and explosive (CBRNE) terrorist attacks. Joint Department of Defense (DoD) CBRNE programs can support homeland-defense efforts in this area. This paper explains some DoD- developed technology involved in advancing and integrating hardware and software components into an advanced threat-detection...
The need for automated instrument product (experiment data records and reduced data records) generation is driven by mission performance requirements such as high data volumes, rapid product turnaround and product complexity combined with the need to keep operational costs low. Historically, missions have independently developed unique capabilities to manage production of critical instrument products...
We report a novel light emitting nano-diode structure consisting of a single monolayer of CdSe nanocrystals deposited on a scanning probe tip for near-field scanning optical microscopy (NSOM). P-doped silicon which forms the probe body was utilized as an anode of the LED. A Langmuir-Blodgett (LB) trough was used to deposit on-probe a monolayer of nanocrystals (5-10 nm thickness), which were then examined...
In prostate brachytherapy, multiple seeds are implanted during each needle insertion, and the locations of these seeds are dependent on the track of the needle shaft inside the tissue. Therefore, the track of needle shaft is as important as the placement of the needle tip on the outcome of this procedure and the effectiveness of therapy. In this study, the needle is rotated at particular locations...
Needle steering in medical procedures has attracted considerable attention in recent years. For example, in prostate brachytherapy, it is desired to insert a flexible beveled-tip needle with minimum deflection. To date, different methods of insertion which incorporate needle rotation about its insertion axis have been proposed in order to reduce needle deflection and target displacement. In this paper,...
An ultrasound probe holder is designed for use in the prostate brachytherapy procedure. The holder comprises a passive-jointed stabilizer that can be used to position, manipulate and lock in place the ultrasound probe, and a tracker mechanism to provide the position and orientation of the probe in 3D space. The information obtained from the integrated stabilizer-tracker mechanism can be utilized in...
This paper assesses the effectiveness and reliability of monitoring techniques for real-time fault detection in bearings of induction motor. The bearing failure modes and the characteristic bearing frequencies associated with the physical construction of the bearings are examined. Experimental results of vibration spectra with different faults are included, for a 7.5 kW cage induction motor, to demonstrate...
An actuated robot arm is designed for use as a macro manipulator that can carry, appropriately orient, precisely position and firmly "lock" in position different types of micro robots and surgical tools necessary for applications in minimally invasive therapy. The sophisticated configuration and joint structure of the arm enable it to perform and interact efficiently with the constrained...
A device for robot-assisted brachytherapy has been designed for use with a minimally-invasive surgical robot such as the ZEUStrade It may be loaded with a standard brachytherapy needle allowing the robot to position its tip at a specified location within cancerous tissue. The device accurately retracts a hollow needle loaded with radioactive seeds while a stationary plunger pushes the seeds out into...
This paper examines two popular bang-bang CDR architectures: one is with a conventional RC loop filter which often involves a 3rd order loop design and the other is with a separate proportional path which involves a straightforward 2nd order loop design. Design considerations for the two architectures are compared as a function of various design parameters that impact jitter tolerance. Theoretical...
Several strategies that were employed for developing next-generation embedded Hard IP are reviewed. Mixed signal Hard IP developed for a multi-protocol serial interface physical layer at 0.622Gbps to 3.125Gbps was redeployed for 0.622Gbps to 6.375Gbps data rates. Ensuring quality meant adopting a strongly modular approach to design and verification. The configuration space of the Hard IP had to be...
Accurate needle insertion in soft, inhomogeneous tissue has been a major concern in several recent studies involving robot-assisted percutaneous therapies. In procedures that involve multiple needle insertions such as transrectal ultrasound guided prostate brachytherapy, it is important to reduce tissue deformation before puncture and during insertion. In order to reduce this deformation, we have...
Scaling has allowed rising transistor counts per die and increases leakage at an exponential rate, making power a primary constraint in all integrated circuit designs. Future designs must address emerging leakage components due to direct band to band tunneling, through MOSFET oxides and at steep junction doping gradients. In this paper, we describe circuit design techniques for managing leakage power,...
Mechanical, thermal and electrical design requirements of cylindrical support structures for large generators are demanding. High elastic modulus and matching linear coefficients of thermal expansions in the axial and circumferential directions are required to meet design criteria for successful performance of machines. In order to achieve design objectives, a filament winding process using high performance...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.