Fast-Clearing Spray Chamber for ICP-AES

1994 ◽  
Vol 48 (6) ◽  
pp. 761-765 ◽  
Author(s):  
Guy Légère ◽  
Eric D. Salin

The rapid-clearing spray chamber design utilizes two critical features for a rapid-clearing system—a nebulizer wash and a high-volume gas flush. The combination of these two features with supporting design features provides a system which can clear out a signal of Fe or Zn from 500 ppm to undetectable levels (below 10 ppb) in about 20 s. A tubular injector is used in the ICP torch to minimize plasma disturbance during the gas flush cycle. Several modifications to the spray chamber were necessary to handle the nebulizer wash efficiently.

2008 ◽  
Vol 45 (4) ◽  
pp. 445-461 ◽  
Author(s):  
Howard H. Chang ◽  
Marina Danilevsky ◽  
David S. Evans ◽  
Daniel D. Garcia-Swartz
Keyword(s):  
System A ◽  

Author(s):  
Ali Asmari ◽  
Lawrence L. Hoberock

Manual Sorting of silverware pieces after being washed by a high-volume commercial dishwasher is a costly and time consuming process which can be improved by automation. This paper describes the design, construction, and testing of an automated silverware sorting process. The process employs machine vision with simple, but effective, high-volume mechanisms to detect the type and orientation of different types of silverware pieces and place them into different bins. The project was conducted in two major phases: 1) Design and Construction of the Mechanism: a simple and effective mechanism was designed to sort the pieces into separate bins off of a conveyor belt. Pneumatic actuators provided the key mechanical sorting. 2) Design of the Control System: a computer program was developed that detects the entrance of a piece into the machine and recognizes the type and orientation of each silverware piece using computer vision techniques. The software then commands the proper mechanical component at the proper time to actuate, so that each piece ends up in the designated bin. The machine was tested with different silverware input sequences The accuracy of the software in identifying the type and direction of the pieces, the accuracy of the mechanical system in sorting the pieces, and the accuracy of the overall system were found to be 100%, 90.63% and 88.75% respectively.


Author(s):  
Ajay C Lall ◽  
Shawn Annin ◽  
Jeff W Chen ◽  
Samantha Diulus ◽  
Hari K Ankem ◽  
...  

Abstract The purpose of this study was to survey high-volume hip preservation surgeons regarding their perspectives on intra-operative management of labral tears to improve decision-making and produce an effective classification system. A cross-sectional survey of high-volume hip preservation surgeons was conducted in person and anonymously, using a questionnaire that is repeated for indications of labral debridement, repair and reconstruction given the torn labra are stable, unstable, viable or non-viable. Twenty-six high-volume arthroscopic hip surgeons participated in this survey. Provided the labrum was viable (torn tissue that is likely to heal) and stable, labral debridement would be performed by 76.92% of respondents for patients >40 years of age and by >84% of respondents for stable intra-substance labral tears in patients without dysplasia. If the labrum was viable but unstable, labral repair would be performed by >80% of respondents for patients ≤40 years of age and > 80% of respondents if the labral size was >3 mm and located anteriorly. Presence of calcified labra or the Os acetabuli mattered while deciding whether to repair a labrum. In non-viable (torn tissue that is unlikely to heal) and unstable labra, labral reconstruction would be performed by 84.62% of respondents if labral size was <3 mm. The majority of respondents would reconstruct calcified and non-viable, unstable labra that no longer maintained a suction seal. Surgeons performing arthroscopic hip labral treatment may utilize this comprehensive classification system, which takes into consideration patient age, labral characteristics (viability and stability) and bony morphology of the hip joint. When choosing between labral debridement, repair or reconstruction, consensus recommendations from high-volume hip preservation surgeons can enhance decision-making.


2004 ◽  
Author(s):  
Basant K. Parida ◽  
W. John Kidd ◽  
Swamidas Punwani

In a locomotive cab structural damage due to collision, derailment or rollover may often block the normal egress routes. These situations require suitable emergency egress systems that provide access both from interior by the crew and from exterior by the rescue team. After incorporation of a removable roof hatch as the primary egress system, a removable windshield and emergency hinge release of the rear door were selected as potential secondary emergency egress alternatives. Simple innovative concepts and cost-effective hardware systems have been developed at Foster-Miller laboratories and installed on mockup assemblies to provide viable solutions to the above two secondary egress systems. Proof of concept demonstration and functionality evaluation were successfully carried out. This paper presents the salient design features and functional evaluation of these novel emergency egress concepts. Feasibility of incorporating these secondary egress systems into new railroad locomotive cab design is briefly discussed.


2001 ◽  
Vol 38 (03) ◽  
pp. 621-634
Author(s):  
David Aldous ◽  
Masakiyo Miyazawa ◽  
Tomasz Rolski

We study a service system in which, in each service period, the server performs the current set B of tasks as a batch, taking time s(B), where the function s(·) is subadditive. A natural definition of ‘traffic intensity under congestion’ in this setting is ρ := lim t→∞ t -1Es (all tasks arriving during time [0,t]). We show that ρ > 1 and a finite mean of individual service times are necessary and sufficient to imply stability of the system. A key observation is that the numbers of arrivals during successive service periods form a Markov chain {A n }, enabling us to apply classical regenerative techniques and to express the stationary distribution of the process in terms of the stationary distribution of {A n }.


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