1,915 research outputs found
The infrared structure of e+ e- --> 3 jets at NNLO reloaded
This paper gives detailed information on the structure of the infrared
singularities for the process e+ e- --> 3 jets at next-to-next-to-leading order
in perturbation theory. Particular emphasis is put on singularities associated
to soft gluons. The knowledge of the singularity structure allows the
construction of appropriate subtraction terms, which in turn can be implemented
into a numerical Monte Carlo program.Comment: 59 pages, additional comments added, version to be publishe
Liquid-Phase Heat-Release Rates of the Systems Hydrazine-Nitric Acid and Unsymmetrical Dimethylhydrazine-Nitric Acid
The initial rates of heat release produced by the reactions of hydrazine and unsymmetrical dimethylhydrazine with nitric acid were determined in a bomb calorimeter under conditions of forced mixing. Fuel-oxidant weight ratio and injection velocity were varied. The rate of heat release apparently depended on the interfacial area between the propellants. Above a narrow range of injection velocities representing a critical amount of interfacial area, the rates reached a maximum and were almost constant with injection velocity. The maximum rate for hydrazine was about 70 percent greater than that for unsymmetrical dimethylhydrazine. The total heat released did not vary with mixture ratio over the range studied
Outline analysis of the grapevine (Vitis vinifera L.) berry shape by elliptic Fourier descriptors
Grapevine berry morphology is one of the most important features in table grape production. In this study, berry samples of 46 grapevine accessions were investigated for 3 consecutive years with elliptic Fourier descriptors (EFD) to evaluate shape diversity. Ten reference shapes obtained from the OIV descriptor list were involved and principal component (PC) scores summarizing the EFD's were statistically evaluated with Two way ANOVA and discriminant analysis. The cummulative contribution of the five principal components was 96.83 %. Two way ANOVA revealed that berry shape had high variability within the accessions and years. Based on the linear discriminant analysis, reference shapes were compared to those of the accessions and graphic reconstruction was carried out. OIV references were considered as unknown samples and grouped into the accession classes. Overall correct classification of the accessions into their group was 13.88Â %. Our results showed that EFD together with reference shapes are a powerful method to discribe berry shape and possibly give the future basis of uvometric evaluation of grapevine cultivars
Ileal transposition:A non-restrictive bariatric surgical procedure that reduces body fat and increases ingestion-related energy expenditure
Background: Ileal Transposition (IT) was developed as a model to study body weight reduction without the restrictive or malabsorptive aspects of other bariatric surgeries, but the exact mechanisms of the alterations in body weight after IT are not completely understood. Objective: To provide a detailed description of the surgical procedure of IT, and describe its effect on energy balance parameters. Methods: Adult male Lewis rats underwent either IT (IT+) or sham (IT-) surgery. Following surgery body weight and energy intake were monitored. After attaining weight stability (> 30 days), energy expenditure and its components were assessed using indirect calorimetry at a day of fasting, limited intake, and ad libitum intake. At the end of the study body composition analysis was performed. Results: IT+ resulted in transiently reduced energy intake, increased ingestion-related energy expenditure (IEE) and decreased body and adipose tissue weight when compared to IT-. At weight stability, neither energy budget (i.e., energy intake - energy expenditure), nor energy efficiency was different in IT+ rats compared to IT-. Conclusion: Our data show that the primary cause of weight reduction following IT+ is a transient reduction in energy intake. If the increased IEE is related to a higher level of satiety, compensatory feeding to bridge body weight difference between IT+ and IT- rats is less likely to occur
Subtraction at NNLO
We propose a framework for the implementation of a subtraction formalism at
NNLO in QCD, based on an observable- and process-independent cancellation of
infrared singularities. As a first simple application, we present the
calculation of the contribution to the e+e- dijet cross section proportional to
C_F T_RComment: 42 pages Latex; 7 figures included. Modifications to the text, and
references added; the results are unchange
Exploiting Term Hiding to Reduce Run-time Checking Overhead
One of the most attractive features of untyped languages is the flexibility
in term creation and manipulation. However, with such power comes the
responsibility of ensuring the correctness of these operations. A solution is
adding run-time checks to the program via assertions, but this can introduce
overheads that are in many cases impractical. While static analysis can greatly
reduce such overheads, the gains depend strongly on the quality of the
information inferred. Reusable libraries, i.e., library modules that are
pre-compiled independently of the client, pose special challenges in this
context. We propose a technique which takes advantage of module systems which
can hide a selected set of functor symbols to significantly enrich the shape
information that can be inferred for reusable libraries, as well as an improved
run-time checking approach that leverages the proposed mechanisms to achieve
large reductions in overhead, closer to those of static languages, even in the
reusable-library context. While the approach is general and system-independent,
we present it for concreteness in the context of the Ciao assertion language
and combined static/dynamic checking framework. Our method maintains the full
expressiveness of the assertion language in this context. In contrast to other
approaches it does not introduce the need to switch the language to a (static)
type system, which is known to change the semantics in languages like Prolog.
We also study the approach experimentally and evaluate the overhead reduction
achieved in the run-time checks.Comment: 26 pages, 10 figures, 2 tables; an extension of the paper version
accepted to PADL'18 (includes proofs, extra figures and examples omitted due
to space reasons
Formation of 3-Monochloro-1,2-Propanediol Fatty Acid Esters During Deep-Fat Frying of Pre-Fried Deep Frozen Food with Different Salt Content
Changes of edible oil quality factors and formation of 3-monochloro-1,2-propanediol fatty acid esters (3-MCPD-FE) during deep-fat frying in four different experiments (control, salt, pork chop, and chicken liver) with high oleic sunflower oil were compared in this study. Based on the results of investigated oil quality parameters, which were free fatty acid (FFA), anisidine value (AV), UV extinction at 232 and 268 nm (E232 and E268, respectively), and total polar material (TPM), only a modest deterioration of the frying oil was observed. As we expected, the 3-MCPD-FE content in the control samples did not reach the limit of quantification (0.1 mg kg–1), while the table salt itself caused a slight increase. The results of pork chop and chicken liver experiments were not statistically different from each other, after the third frying circle 0.52 and 0.39 mg kg–1 3-MCPD-FE levels were reached, respectively. Based on these values, the human exposure estimation resulted in a low risk
Bronchial reactivity after nasal provocation with histamine
Malo se zna o vezi između reaktivnosti gornjih i donjih dišnih putova. U 11 bolesnika s alergijskim rinitisom bez znakova bronhalne astme, u 11 radnika profesionalno eksponiranih iritansima dišnog sustava i u 11 zdravih osoba ispitali smo nespecifičnu nosnu reaktivnost i promjenu razine nespecifične bronhalne reaktivnosti nakon testa nespecifične nosne reaktivnosti. Prije i nakon nosnog testa učinjena je nespecifična bronhoprovokacija kumulativnorn metodom (prema Chai H. i sur, J Allergy Clin lmmunol 1975;56:323-7), inhalacijom otopine histamina od 0,125 mg/ml do 128 mg/ml. Nespecifična nosna provokacija izvedena je uštrcavanjem podvostručujućih koncentracija histamina (0,125-32 mg/ml) u obje nosnice svake tri minute. Reakcija je praćena mjerenjem parametara: nosni inspiratorni maksimalni protok, nosni otpor, nosni forsirani ekspiratorni volumen u prvoj sekundi i nosni srednji ekspiratorni protok. Utvrdili smo značajno nižu razinu nespecifične nosne reaktivnosti u osoba oboljelih od alergijskog rinitisa. Nespecifična bronhalna reaktivnost bila je značajno niža u njih, ali i u radnika izloženih respiratornim nadražljivcima u odnosu na kontrolnu skupinu. Spremnost bronhalnog stabla da reagira spazmom na inhalirani histamin statistički značajno je umanjena nakon nespecifične nosne provokacije u zdravih osoba i u radnika izloženih iritansima dišnog sustava.Data on the relationship between nasal and bronchial reactivities are scarce. This study aimed at investigating a possible influence of the nasal provocation test on bronchial reactivity. Three groups of eleven subjects each were examined: patients suffering from allergic rhinitis with no clinical evidence of asthma, workers exposed to respiratory irritants complaining of occupational rhinitis and asthma, and healthy subjects. Non-specific bronchoprovocation was performed before and after nasal challenge with histamine. The bronchial challenge with histamine solutions (0.125mg/ml and 128 mg/ml) was performed by the five-breath cumulative method (Chai H. et al. J Allergy Clin lmmunol 1975;56:323-7). Non-specific nasal provocation was performed by spraying doubling concentrations of histamine (0.125 mg/ml - 32 mg/ml) into both nostrils al three-minute intervals. The reaction was monitored by measurement of nasal inspiratory peak flow, nasal resistance, and nasal spirometry. The level of non-specific nasal reactivity was significantly lower in patients with allergic rhinitis than in the other two groups. The bronchial reactivity of the -rhinitis- group and of those occupationally exposed to irritants was significantly lower than among healthy subjects. An immediate and significant decrease in bronchial reactivity could be observed after nasal challenge in the group of healthy subjects as well as in workers exposed to irritants, but there was no significant change in bronchial reactivity among patients suffering from allergic rhinitis
Mal/SRF Is Dispensable for Cell Proliferation in Drosophila
The Mal/SRF transcription factor is regulated by the level of G-actin in cells and has important roles in cell migration and other actin-dependent processes in Drosophila. A recent report suggests that Mal/SRF and an upstream regulator, Pico, are required for cell proliferation and tissue growth in Drosophila. I find otherwise. Mutation of Mal or SRF does not affect cell proliferation in the fly wing. Furthermore, I cannot reproduce the reported effects of Pico RNAi or Pico overexpression on body size. Nevertheless, I can confirm that overexpression of Pico or Mal causes tissue overgrowth specifically in the fly wing - where SRF is most highly expressed. My results indicate that Mal/SRF can promote tissue growth when abnormally active, but is not normally required for tissue growth during development
The fully differential hadronic production of a Higgs boson via bottom quark fusion at NNLO
The fully differential computation of the hadronic production cross section
of a Higgs boson via bottom quarks is presented at NNLO in QCD. Several
differential distributions with their corresponding scale uncertainties are
presented for the 8 TeV LHC. This is the first application of the method of
non-linear mappings for NNLO differential calculations at hadron colliders.Comment: 27 pages, 13 figures, 1 lego plo
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