Investigating the Selective Control of Photoassociation of Yb2

The selective control of photoassociation of Yb2 is investigated in theory. Based on ab initio to rationalize Franck–Condon filtering, the optimal target states of photoassociation have been obtained. The corresponding vibrational transitions from X1Σ+g to the excited state (A1Σu+, B1Πu, C1Σu+, and D1Πu) are v ′ = 23, 50, 55, and 0, respectively. By using quantum wave packet dynamic methods, we calculated the yields with time evaluation for the selected target states. The projections of time-dependent wave functions of initial states on the target vibrational eigenstates reflected the synthetic yields of Yb2. For target A1Σu+, we used Gaussian pulse to make the yield of v ′ = 23 up to 97% at 725 fs. After a laser pulse, the positive chirp promoted the yield of vibrational states to increase, but the negative chirp inhibited its decrease. For the D1Πu state, when laser intensity is 1.0 × 1014 W/cm2, the purity and yield of target state v ′ = 0 reached the maximum at 1350 fs. That is to say, changing the laser parameters and pulse shapes could control the photochemical reaction along our desired direction. These conditions will provide an important reference and suggest a scheme for a feasible photoassociation of further experimental and theoretical research studies. Current study may promote an important step toward the realization of highly accurate quantum manipulation and material synthesis.

Differences in selectivity between bermudagrass and goosegrass (Eleusine indica) to low-rate topramezone and metribuzin combinations

Goosegrass [Eleusine indica (L.) Gaertn.] remains problematic for bermudagrass [Cynodon dactylon (L.) Pers.] turf managers due to the ineffective, selective control of mature plants with available POST herbicides and lack of sufficient residual activity from those herbicides to control seedling plants. Topramezone controls mature E. indica, but past efforts to suppress potential injury to bermudagrass turf have been inconsistent. We hypothesized that metribuzin at 210 g ai ha−1 in admixture with topramezone would improve bermudagrass tolerance while conserving mature E. indica control. In preliminary field studies, metribuzin mixed with topramezone at 1.2 or 2.5 g ae ha−1 applied twice at a 3-wk interval reduced bermudagrass injury and white discoloration compared to topramezone applied alone, but metribuzin did not safen bermudagrass to mesotrione. Topramezone at 3.7 g ha−1 plus 210 g ha−1 metribuzin applied twice at a 3-wk interval offered improved bermudagrass tolerance while it still controlled mature E. indica during fifteen field and two greenhouse studies in Virginia. This program offered a 10-fold decrease in suprathreshold duration of white-discoloration compared to topramezone alone at 6.1 g ha−1. Bermudagrass absorbed three times less radioactivity than E. indica at timings up to 48 h after treatment with 14C-topramezone. Bermudagrass also metabolized twice as much topramezone compared to E. indica at 48 h after treatment. Metribuzin reduced 14C absorption by approximately 25% in both species. These studies confirm the performance of a novel, low-dose topramezone plus metribuzin program for mature E. indica control in bermudagrass turf, and suggest that selectivity between bermudagrass and E. indica to topramezone is due to differential absorption and metabolism. The fact that metribuzin reduces topramezone absorption in both species suggests that it may help reduce bermudagrass phytotoxic response to topramezone, but its role in altering selectivity between bermudagrass and E. indica may be due to other factors.

Correlation between selective motor control and upper extremity function in children with hemiparesis

Background: Impairedselective motor control is a common problem in children with hemiparesis; it interferes with upper extremity function and grip strength of the affected side. Aim: To study the relationship between selective motor control and upper extremity function in children with hemiparesis. Methods: This study included a convenient sample of 48 children with hemiparesis (age; four to eight years). The test of arm selective control, quality of upper extremity skill test, and hand held dynamometers were used to assess the selective motor control, upper extremityfunction and hand grip strength respectively. Results: The results showed positive significant correlation (p> 0.05) between test of arm selective control with upper extremityfunction (r=0.85) and hand grip strength (r=0.77). Moreover, there was positive significant correlation between upper extremityfunction and hand grip strength (r=0.72). Conclusion: Selective motor control is positively correlated with upper extremityfunction and hand grip strength in children with hemiparesis. The results help in the development of appropriate treatment programs for the rehabilitation of children with hemiplegia. Keywords: Cerebral palsy; Hand grip strength; Selective motor control; Unilateral cerebral palsy; Upper extremity function.

Selective control of the contact and transport between droplet pairs by electrowetting-on-dielectric for droplet-array sandwiching technology

Methodological advances in on-chip technology enable high-throughput drug screening, such as droplet-array sandwiching technology. Droplet-array sandwiching technology involves upper and lower substrates with a droplet-array designed for a one-step process. This technology is, however, limited to batch manipulation of the droplet-array. Here, we propose a method for selective control of individual droplets, which allows different conditions for individual droplet pairs. Electrowetting-on-dielectric (EWOD) technology is introduced to control the height of the droplets so that the contact between droplet-pairs can be individually controlled. Circular patterns 4 mm in diameter composed of electrodes for EWOD and hydrophilic–hydrophobic patterns for droplet formation 4 μl in volume were developed. We demonstrate the selective control of the droplet height by EWOD for an applied voltage up to 160 V and selective control of the contact and transport of substances. Presented results will provide useful method for advanced drug screening, including cell-based screening.

Administrative Law Challenges of Post-Clearance Audit in Serbia

Most imported/exported goods are not controlled by customs authorities at the border. This allows for the fast release of goods and the better functioning of international trade. The backbone of this system consists of customs declarations filed by the importers/exporters, selective control at the border, based on risk assessment, and the post-clearance audit (PCA) of the accepted customs declarations. This pape r deals with the questionable practice of the Serbian Customs Administration with regard to the conducting of the PCA, particularly its relation with the Law on General Administrative Procedure and the issues related to the classification of goods according to customs tariff. The author identifies issues regarding the transparency, interpretation and implementation of the PCA in Serbia and contests the (internationally recognized) practice of changing the classification of goods in accepted customs declarations. The author proposes possible solutions for identified challenges.