| 1. |
- Alkhomashi, N., et al.
(författare)
-
Beta(-)-Delayed And Isomer Spectroscopy Of Neutron-Rich Ta And W Isotopes
- 2009
-
Ingår i: Acta Physica Polonica B. - 0587-4254. ; 40:3, s. 875-878
-
Konferensbidrag (refereegranskat)abstract
- Decays of neutron-rich A similar to 190 nuclei have been studied following projectile fragmentation of a Pb-208 beam on a Be-9 target at the GSI Fragment Separator. Gamma-ray decays from previously reported isomeric states in Ta-188, W-190 and (192,193) Re were used as internal calibrations for the particle identification analysis, together with the identification of previously unreported isomeric decays in Ta-189 and W-191. The current work also identifies beta-delayed gamma rays following the decay of Ta-188 to W-188 for the first time.
|
|
| 2. |
- Morales, A. I., et al.
(författare)
-
beta -Delayed gamma -Ray Spectroscopy of Heavy Neutron Rich Nuclei "South" of Lead
- 2009
-
Ingår i: Acta Physica Polonica B. - 0587-4254. ; 40:3, s. 867-870
-
Konferensbidrag (refereegranskat)abstract
- Relativistic projectile fragmentation of a Pb-208 primary beam has been used to produce neutron-rich nuclei with proton-holes relative to the Z = 82 shell closure, i.e., "south" of Pb. beta-delayed gamma-ray spectroscopy allows to investigate the structural properties of such nuclei with A similar to 195 -> 205. The current work presents transitions de-exciting excited states in Au-204, which are the first spectroscopic information on this N = 125 isotone.
|
|
| 3. |
- Gorska, M., et al.
(författare)
-
Nuclear Structure Addressed At GSI/RISING
- 2009
-
Ingår i: International Journal Of Modern Physics E - Nuclear Physics. - 0218-3013. ; 18:4, s. 759-766
-
Konferensbidrag (refereegranskat)abstract
- Nuclear structure spectroscopy studies at GSI recently gained increased momentum within a broad international community with the installation of the Rare Isotopes Spectroscopic INvestigation at GSI (RISING) project. A wide range of physical phenomena has been addressed by high-resolution in-beam gamma-ray spectroscopy experiments with radioactive beams. Relativistic radioactive beams are implanted and their subsequent. and beta decay is investigated. Within this "stopped beam campaign" germanium detectors were arranged in a close geometry around the passive stopper or an array of DSSSD detectors. The exceptionally high gamma-ray efficiency of that configuration made it possible to identify decays of excited or ground states of nuclei which have not been observed before. The results discussed here include the astrophysically relevant shell structure of N=82 isotones, N=Z nuclei around Ni-54, and proton drip-line nuclei below Sn-100. The experimental data are compared to the results of large scale shell-model calculations using various sets of realistic residual two-body interaction.
|
|
| 4. |
|
|
| 5. |
- Shoemaker, M. A., et al.
(författare)
-
Design and validation of a trajectory estimation system for the Hayabusa sample return capsule
- 2010
-
Ingår i: Spaceflight Mechanics 2010, Pts I-III. - : Univelt, Inc. - 9780877035602 ; , s. 375-394
-
Konferensbidrag (refereegranskat)abstract
- The Japanese Hayabusa spacecraft will return to Earth in summer, 2010, carrying samples from asteroid Itokawa. Because the sample return capsule will reenter the atmosphere at night, the capsule and surrounding air will appear as a bright light (i.e., "fireball") during the portion of the trajectory with high aerodynamic heating. Kyushu University, in collaboration with the Japan Aerospace Exploration Agency, is developing a ground-based optical sensor system to observe the reentry and estimate the vehicle's trajectory. This paper describes the design and validation currently underway for the proposed system, in preparation for operations in mid-2010. An Extended Kalman Filter (EKF) is used to estimate the capsule's position and velocity, as well as a scale factor on the atmospheric density. Simulations of the EKF show that the capsule's state at the end of the visible portion of the trajectory (i.e., at approximately 25 km altitude) can be estimated with a 1-s uncertainty of 60 m in position and 8 m/s in velocity.
|
|
| 6. |
- Evander, Mikael, et al.
(författare)
-
Using Acoustic Differential Extraction to enhance analysis of sexual assualt evidence on a valveless glass microdevice
- 2006
-
Ingår i: Proceedings of µTAS 2006 Conference. ; 2, s. 1055-1057
-
Konferensbidrag (refereegranskat)abstract
- The isolation of male and female DNA is an important step in the analysis of sexual assault evidence. A vaginal swab with female epithelial cells and male sperm cells is obtained from the female, and it is vital to separate the male and female fractions in order to obtain a single-source DNA profile of the suspect. In the case of a low abundance of sperm cells, it is very important that no cells are lost in the isolation step. The conventional isolation method used in the forensic DNA laboratories, differential extraction, is a time-consuming step, requiring up to 24 hours. It is neither highly amenable to automation, nor can it be easily integrated with other steps of the analysis. Therefore, a novel method of performing the isolation of male and female fractions of biological material from sexual assault evidence has been developed, termed acoustic differential extraction (ADE). After selectively lysing the female epithelial cells while keeping the sperm cells intact, the sample, now containing sperm cells and female cell lysate, is infused in a 900 μm wide and 70 μm deep microfabricated glass channel with miniature piezoelectric transducers mounted at the bottom of the channel, as shown in Figure 1. Upon activation of the ultrasound, the sperm cells will be trapped in a standing wave1 while free DNA will not be retained. The sperm cells, levitated in the 3D fluidic space above the transducer, can be washed with buffer and the unretained biological material directed to an output reservoir. Using laminar flow valving2, the sperm cells can be released and directed into a separate output reservoir in anticipation of DNA analysis, see Figure 2. With the purpose of evaluating the ADE microdevice for the collection of the two output fractions (male and female), preliminary work used a mock sexual assault sample created with polystyrene microparticles as sperm cells and Evan's Blue dye as female cell lysate. The particles were trapped over the transducer and the dye was directed to the female outlet reservoir as shown in Figure 3. After washing the particles, the ultrasound was deactivated and the flow redirected in order to collect the particles in the male outlet reservoir. A biological sample consisting of sperm cells and lysed female epithelial cells was subsequently tested by infusion into the device for five minutes while trapping the sperm cells over the transducer (Figure 4). The trapped sperm cells were washed with PBS for five minutes, then released and collected for analysis off-chip. DNA from the isolated cells was extracted with a commercial DNA extraction kit and analyzed with a duplex quantitative PCR assay3 to show the sample purity. An example of the qPCR data obtained is provided in Table 1. The results show that a highly-enriched sperm cell fraction can be obtained with the ADE technique. It is reasonable to expect that this technique can be integrated with on-chip downstream sample processing, e.g. DNA extraction and amplification. This would greatly diminish the analysis time from 24 hours to approximately 60 minutes. The time savings, in combination with the possibility to create a fully automated system, gives the ADE technique the potential to significantly alter the means by which sexual assault evidence is processed in crime laboratories today.
|
|
| 7. |
|
|
| 8. |
|
|
| 9. |
|
|
| 10. |
|
|
