The ALICE TPC, a large 3-dimensional tracking device with fast readout for ultra-high multiplicity events

The design, construction, and commissioning of the ALICE Time-Projection Chamber (TPC) is described. It is the main device for pattern recognition, tracking, and identification of charged particles in the ALICE experiment at the CERN LHC. The TPC is cylindrical in shape with a volume close to 90 m3 and is operated in a 0.5 T solenoidal magnetic field parallel to its axis. In this paper we describe in detail the design considerations for this detector for operation in the extreme multiplicity environment of central Pb–Pb collisions at LHC energy. The implementation of the resulting requirements into hardware (field cage, read-out chambers, electronics), infrastructure (gas and cooling system, laser-calibration system), and software led to many technical innovations which are described along with a presentation of all the major components of the detector, as currently realized. We also report on the performance achieved after completion of the first round of stand-alone calibration runs and demonstrate results close to those specified in the TPC Technical Design Report.publishedVersio

The proximate composition of three marine pelagic fish: blue whiting (Micromesistius poutassou), boarfish (Capros aper) and Atlantic herring (Clupea harengus)

peer reviewedThis study presents data from an in-depth proximate compositional analysis of three marine fish species: blue whiting (Micromesistius poutassou), boarfish (Capros aper) and Atlantic herring (Clupea harengus). These fish contained significant amounts of protein (16–17%), lipids (4–11%) and minerals (2–6% ash). The proteins, particularly from boarfish, had close to optimum amino acid profiles for human and fish nutrition. They compared favourably with other fish species in terms of total lipids and relative concentration of the omega-3 fatty acids docosahexaenoic acid and eicosapentaenoic acid (11.8–13.3% and 5.9–8.1% in triacylglycerols [TG] and 24.6–35.4% and 5.8–12.0% in phospholipids [PL]). Atlantic herring had the highest lipid content among the three fish and was found to contain high levels of PL poly-unsaturated fatty acids, including omega-3 fatty acids. Minerals detected in the fish included calcium (272–1,520 mg/100 g), phosphorus (363–789 mg/100 g), iron (1.07–2.83 mg/100 g), magnesium (40.70–62.10 mg/100 g), potassium (112.00–267.00 mg/100 g), selenium (0.04–0.06 mg/100 g), sodium (218.00–282.00 mg/100 g) and zinc (1.29–5.57 mg/100 g). Boarfish had the highest ash fraction and also the highest levels of all the minerals, except potassium. Atlantic herring had considerably lower mineral content compared with the other two species and, levels detected were also lower than those reported in previously published studies. Heavy metals contents were quantified, and levels were significantly below the maximum allowable limits for all elements except arsenic, which ranged from 1.34 to 2.44 mg/kg in the three fish species. Data outlined here will be useful for guiding product development. Future studies would benefit from considering catch season, sex and developmental stage of the fish

Yours, Mine, or Ours: Tax-Related Decision Responsibility of Married Couples

Purpose: Examine tax-related decisions of married couples to determine whether decisions are made jointly or if one spouse dominates the decision. We also examine characteristics related to decision styles. Methodology/approach: Questionnaires completed independently by both the husband and wife. Findings: Nearly 40 percent of the couples make tax decisions jointly, while the remaining couples allow one spouse to dominate tax-related decisions. The results indicate that when one spouse dominates the decisions, it is most often the wife. We also find that couples are more likely to share tax-related decision responsibility jointly when the husband earns significantly more than the wife, when the couple has greater income as a family, and when they are a new couple. Research limitations/implications: Prior research has generally not recognized tax decisions by married couples as a joint decision or attempted to determine whether tax decisions are dominated by the husband or wife. This issue has implications for interpreting research results in light of prior research that has found that tax-related decisions vary significantly by gender. The finding that many couples make joint decisions suggests that an interesting avenue for future research would be to determine the nature of that joint decision making and whether it is collaborative, bargaining, or something else. Originality/value: Prior research on tax-related decisions has not recognized that for approximately 40 percent of tax returns filed, the unit of study is not a single individual but a married couple

The relationship between confidence in charitable organizations and volunteering revisited

Confidence in charitable organizations (charitable confidence) would seem to be an important prerequisite for philanthropic behavior. Previous research relying on cross-sectional data has suggested that volunteering promotes charitable confidence and vice versa. This research note, using new longitudinal panel data from the Netherlands, contradicts the suggestion generated by previous research. Volunteers indeed have more charitable confidence, but changes in one are not related to changes in the other. The authors identify generalized social trust and altruistic values as omitted variables that produce the previously observed relationship. The practical implication of this finding is that a decline in charitable confidence is unlikely to reduce volunteering. The theoretical implication is that volunteering is symbolic rather than instrumental. © 2009 SAGE Publications