228 research outputs found
Sulfur management strategies to improve partial sulfur balance with irrigated peanut production on deep sands
Sands have favourable physical properties for harvesting peanut, but improving S and water use efficiency on these soils remains a challenge. We studied partial S balance in irrigated peanut crops on sands of Central Vietnam to identify key factors of S fertiliser management affecting S inputs and outputs. Field trials were conducted in the spring seasons of 2015 and 2016 to determine the effects of S application rates (0, 15, 30, 45 kg haβ1) on peanut yield and partial S balance. Sulfur balances were negative (-28.3 to 5.6 kg S haβ1) at rates < 30 kg S haβ1, while at higher rates of S fertiliser application that produced maximum pod yield (30 - 45 kg S haβ1), three of four sites showed neutral to slightly positive S balance (1.5 - 5.6 kg S haβ1). The negative partial S balance decreased with increasing S rates but was mostly attributable to the large S removal in peanut shoots (9.7 - 22.3 kg S haβ1) which are used on farms for animal feed. The negative partial S balance results in depletion of soil S reserves and hence efficient recycling of S on farms is critical for sustainable crop production on sands of VN
Improving technological machining simulation by tailored workpiece models and kinematics
Geometric modelling is an established approach for gathering detailed knowledge about the chronological sequence of process conditions and for determining technological values of machining processes such as milling, turning, grinding or additive manufacturing. Performance and accuracy essentially depend on the chosen workpiece model and its parametrization. Furthermore, several influences on the investigated machine tool system lead to errors, which must be modeled separately. This paper shows approaches to increase performance and accuracy of the simulation by choosing an appropriate combination of different geometric representations of the workpiece and by considering possible errors within the kinematic model. Examples for different applications in metal cutting are given
Is vitrification involved in depression of the phase transition temperature in dry phospholipids?
AbstractRecent literature has suggested that the depression of the phase transition temperature (Tm) in dry phospholipids by sugars may be ascribed to vitrification of the stabilizing solute, rather than by the direct interaction between sugar and phospholipid we have proposed. Koster et al. ((1994) Biochim. Biophys. Acta 1193, 14β150) claim that the only necessity is that the glass transition (Tg) for the sugar exceed Tm for the lipid. Evidence is presented in the present paper that this is not sufficient. Based on the vitrification hypothesis of Koster et al., the predicted order of effectiveness in depressing Tm in dry dipalmitoylphosphatidylcholine (DPPC) is dextran β₯ hydroxyethyl starch > stachyose > raffinose > trehalose > sucrose > glucose. In fact, the opposite order was seen. The effect of raffinose, sucrose, or trehalose on Tm in dry DPPC depends on the thermal history of the sample, as we have reported previously. When DPPC dried with trehalose is heated for the first time, Tm is about 55Β°C, but on the second and subsequent heating scans Tm falls to about 25Β°C. Koster et al. suggest that this effect is due to heating the sample above Tg rather than to melting the hydrocarbon chains. We present evidence here that all that is required is for the chains to be melted. Further, we show that retention of residual water by DPPC dried with trehalose depends on the drying temperature, but is independent of drying temperature with glucose, a finding that is consistent with direct interaction. We conclude that vitrification is not in itself sufficient to depress Tm in dry phospholipids
The effects of magnetic field on the d-density wave order in the cuprates
We consider the effects of a perpendicular magnetic field on the d-density
wave order and conclude that if the pseudogap phase in the cuprates is due to
this order, then it is highly insensitive to the magnetic field in the
underdoped regime, while its sensitivity increases as the gap vanishes in the
overdoped regime. This appears to be consistent with the available experiments
and can be tested further in neutron scattering experiments. We also
investigate the nature of the de Haas- van Alphen effect in the ordered state
and discuss the possibility of observing it.Comment: 5 pages, 4 eps figures, RevTex4. Corrected a silly but important typo
in the abstrac
Down Syndrome Patients with Congenital Portosystemic Shunts: A Case Report and Review
Introduction: Down syndrome is due to trisomy 21 and is characterized by intellectual disability, dysmorphic facial features, congenital malformations, and gastrointestinal abnormalities. There is an increased appreciation of congenital portosystemic shunts in Down syndrome patients. Congenital portosystemic shunts have been associated with many defects in body systems, including cardiac, metabolic, and neurological. Case Presentation: Herein, we describe a portosystemic shunt in a Down syndrome patient that resulted in hyperammonemia with altered mental status and choreiform movements. Computed tomography angiography of the abdomen and pelvis identified a connection between the right portal vein and inferior vena cava. An 18 mm Amplatzer PFO closure device was placed within the congenital shunt, significantly improving symptoms. The patient has no sequelae from the related shunt or the device at the 2-year follow-up. We extensively reviewed the literature and identified cases of portosystemic shunts in Down syndrome patients. Shunts can either be extrahepatic or intrahepatic and are classified by vasculature connections. Conclusion: From our literature review and case presentation, we identify other conditions in patients, including cardiac and gastrointestinal defects. We then review the available treatment options, whether observation or surgical, depending on the patientβs clinical picture
Mucosal versus muscle pain sensitivity in provoked vestibulodynia
An estimated 8.3%β16% of women experience vulvovaginal discomfort during their lifetime. Frequently these patients report provoked pain on contact or with attempted intercourse, commonly referred to as provoked vestibulodynia (PVD). Despite the burden of this condition, little is known about its potential etiologies including pelvic floor muscular dysfunction and mucosal components. This knowledge would be beneficial in developing targeted therapies including physical therapy
ΠΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΡ ΠΎΠ±ΡΠ΅Π³ΠΎ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ ΡΠ»Π°Π²ΠΎΠ½ΠΎΠΈΠ΄ΠΎΠ² Π² ΡΠΏΠΈΡΡΠΎΠ²ΠΎΠΌ ΡΠΊΡΡΡΠ°ΠΊΡΠ΅ Persicaria pulchra (Bl.) SojΓ‘k Π΄Π»Ρ ΠΈΠ½Π³ΠΈΠ±ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠ΅ΡΠΌΠ΅Π½ΡΠ° Ξ±-Π³Π»ΡΠΊΠΎΠ·ΠΈΠ΄Π°Π·Ρ
Objectives.Β There has been a rapid increase in the number of diabetic patients since the past few decades in developed and developing countries. This rapid increase is accompanied by alarming costs of treatment. Ξ±-Glucosidase inhibitors are one of the most effective drugs employed for the reduction of postprandial hyperglycemia to manage Type 2 diabetes mellitus. Additionally, flavonoids, a group of natural substances, which are widely distributed in plants and possess variable phenolic structures, exhibit outstanding hypoglycemic activity and are considered as potential Ξ±-glucosidase inhibitors. In Vietnam, Persicaria pulchra (Bl.) SojΓ‘k (P. pulchra) is employed in traditional medications. It possesses high flavonoid contents and its anti-diabetes ability has been hypothesized, although it has attracted less attention for investigation. Hence, the aim of this study is to optimize the condition of the P. pulchra extract to obtain the highest total flavonoid content and measure the bioactivities of P. pulchra, such as the anti-Ξ±-glucosidase and antioxidant activities.Methods.Β The effects of the extracting conditions, including the temperature, extraction time, liquid-to-solid ratio (LSR), and ethanol (C2H5OH) concentration, on the total flavonoid content are investigated via experiments and analyzed by the response surface methodology (RSM). Concurrently, the optimal extraction also determines the anti-Ξ±-glucosidase and antioxidant activities.Results.Β The optimal extraction condition for the highest flavonoid content (530 mg quercetin/g) is determined in 60 min, at 53Β°C, with LSR of 9.46 g/g and C2H5OH concentration of 62%. Moreover, the optimal plant extract exhibits good Ξ±-glucosidase inhibition with a half-maximal inhibitory concentration (IC50) of 22.67 mg/mL, compared to the positive control (acarbose β7.77 g/mL). Additionally, P. pulchra is proposed to be a potential antioxidant with an IC50 of ~12.68 Β΅g/mL.Conclusions.Β The study confirmed the optimal extraction condition of P. pulchra that will obtain the highest total flavonoid content and revealed the potentials of P. pulchra in Ξ±-glucosidase inhibition and antioxidation.Π¦Π΅Π»ΠΈ. Π ΠΏΠΎΡΠ»Π΅Π΄Π½ΠΈΠ΅ Π΄Π΅ΡΡΡΠΈΠ»Π΅ΡΠΈΡ Π² ΡΠ°Π·Π²ΠΈΡΡΡ
ΠΈ ΡΠ°Π·Π²ΠΈΠ²Π°ΡΡΠΈΡ
ΡΡ ΡΡΡΠ°Π½Π°Ρ
Π½Π°Π±Π»ΡΠ΄Π°Π΅ΡΡΡ Π±ΡΡΡΡΡΠΉ ΡΠΎΡΡ ΡΠΈΡΠ»Π° Π±ΠΎΠ»ΡΠ½ΡΡ
Π΄ΠΈΠ°Π±Π΅ΡΠΎΠΌ, ΠΊΠΎΡΠΎΡΡΠΉ ΡΠΎΠΏΡΠΎΠ²ΠΎΠΆΠ΄Π°Π΅ΡΡΡ ΡΠΎΡΡΠΎΠΌ ΡΡΠΎΠΈΠΌΠΎΡΡΠΈ Π»Π΅ΡΠ΅Π½ΠΈΡ. ΠΠ½Π³ΠΈΠ±ΠΈΡΠΎΡΡ Ξ±-Π³Π»ΡΠΊΠΎΠ·ΠΈΠ΄Π°Π·Ρ ΡΠ²Π»ΡΡΡΡΡ ΠΎΠ΄Π½ΠΈΠΌ ΠΈΠ· Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΡΡ
ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΠΎΠ², ΠΏΡΠΈΠΌΠ΅Π½ΡΠ΅ΠΌΡΡ
Π΄Π»Ρ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΡ ΠΏΠΎΡΡΠΏΡΠ°Π½Π΄ΠΈΠ°Π»ΡΠ½ΠΎΠΉ Π³ΠΈΠΏΠ΅ΡΠ³Π»ΠΈΠΊΠ΅ΠΌΠΈΠΈ ΠΏΡΠΈ Π»Π΅ΡΠ΅Π½ΠΈΠΈ ΡΠ°Ρ
Π°ΡΠ½ΠΎΠ³ΠΎ Π΄ΠΈΠ°Π±Π΅ΡΠ° 2 ΡΠΈΠΏΠ°. ΠΡΠΎΠΌΠ΅ ΡΠΎΠ³ΠΎ, ΡΠ»Π°Π²ΠΎΠ½ΠΎΠΈΠ΄Ρ, Π³ΡΡΠΏΠΏΠ° ΠΏΡΠΈΡΠΎΠ΄Π½ΡΡ
Π²Π΅ΡΠ΅ΡΡΠ², ΡΠΈΡΠΎΠΊΠΎ ΡΠ°ΡΠΏΡΠΎΡΡΡΠ°Π½Π΅Π½Π½ΡΡ
Π² ΡΠ°ΡΡΠ΅Π½ΠΈΡΡ
ΠΈ ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΡ
ΡΠ°Π·Π»ΠΈΡΠ½ΡΠ΅ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄Π½ΡΠ΅ ΡΠ΅Π½ΠΎΠ»Π°, ΠΏΡΠΎΡΠ²Π»ΡΡΡ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΡΡ Π³ΠΈΠΏΠΎΠ³Π»ΠΈΠΊΠ΅ΠΌΠΈΡΠ΅ΡΠΊΡΡ Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΈ ΠΌΠΎΠ³ΡΡ ΡΠ»ΡΠΆΠΈΡΡ ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π»ΡΠ½ΡΠΌΠΈ ΠΈΠ½Π³ΠΈΠ±ΠΈΡΠΎΡΠ°ΠΌΠΈ Ξ±-Π³Π»ΡΠΊΠΎΠ·ΠΈΠ΄Π°Π·Ρ. ΠΠΎ ΠΡΠ΅ΡΠ½Π°ΠΌΠ΅ Persicaria pulchra (Bl.) SojΓ‘k (P. pulchra) ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΠ΅ΡΡΡ Π² Π½Π°ΡΠΎΠ΄Π½ΠΎΠΉ ΠΌΠ΅Π΄ΠΈΡΠΈΠ½Π΅. ΠΠ½ ΠΎΠ±Π»Π°Π΄Π°Π΅Ρ Π²ΡΡΠΎΠΊΠΈΠΌ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠ΅ΠΌ ΡΠ»Π°Π²ΠΎΠ½ΠΎΠΈΠ΄ΠΎΠ² ΠΈ, ΠΏΡΠ΅Π΄ΠΏΠΎΠ»ΠΎΠΆΠΈΡΠ΅Π»ΡΠ½ΠΎ, ΠΏΡΠΎΡΠΈΠ²ΠΎΠ΄ΠΈΠ°Π±Π΅ΡΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ ΡΠ²ΠΎΠΉΡΡΠ²Π°ΠΌΠΈ, Ρ
ΠΎΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ ΠΌΠ°Π»ΠΎ. Π’Π°ΠΊΠΈΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠΌ, ΡΠ΅Π»ΡΡ Π½Π°ΡΡΠΎΡΡΠ΅Π³ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΎΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΡ ΡΠΊΡΡΡΠ°Π³ΠΈΡΠΎΠ²Π°Π½ΠΈΡ P. pulchra Π΄Π»Ρ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ Π²ΡΡΠΎΠΊΠΎΠ³ΠΎ ΠΎΠ±ΡΠ΅Π³ΠΎ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ ΡΠ»Π°Π²ΠΎΠ½ΠΎΠΈΠ΄ΠΎΠ², Π° ΡΠ°ΠΊΠΆΠ΅ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ Π΅Π³ΠΎ Π±ΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠΉ Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ β Π°Π½ΡΠΈ-Ξ±-Π³Π»ΡΠΊΠΎΠ·ΠΈΠ΄Π°Π·Π½ΠΎΠΉ ΠΈ Π°Π½ΡΠΈΠΎΠΊΡΠΈΠ΄Π°Π½ΡΠ½ΠΎΠΉ. ΠΠ΅ΡΠΎΠ΄Ρ. ΠΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΎ Π²Π»ΠΈΡΠ½ΠΈΠ΅ ΡΡΠ»ΠΎΠ²ΠΈΠΉ ΡΠΊΡΡΡΠ°Π³ΠΈΡΠΎΠ²Π°Π½ΠΈΡ, Π° ΠΈΠΌΠ΅Π½Π½ΠΎ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΡ, Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ ΡΠΊΡΡΡΠ°ΠΊΡΠΈΠΈ, ΡΠΎΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ ΠΆΠΈΠ΄ΠΊΠΎΡΡΡ : ΡΠ²Π΅ΡΠ΄ΠΎΠ΅ Π²Π΅ΡΠ΅ΡΡΠ²ΠΎ ΠΈ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠΈ ΡΡΠ°Π½ΠΎΠ»Π°, Π½Π° ΠΎΠ±ΡΠ΅Π΅ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠ΅ ΡΠ»Π°Π²ΠΎΠ½ΠΎΠΈΠ΄ΠΎΠ² Ρ ΠΏΠΎΠΌΠΎΡΡΡ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ»ΠΎΠ³ΠΈΠΈ Π°Π½Π°Π»ΠΈΠ·Π° ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ ΠΎΡΠΊΠ»ΠΈΠΊΠ°. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΠ΅ ΡΡΠ»ΠΎΠ²ΠΈΡ ΡΠΊΡΡΡΠ°ΠΊΡΠΈΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΡΡ Π°Π½ΡΠΈ-Ξ±-Π³Π»ΡΠΊΠΎΠ·ΠΈΠ΄Π°Π·Π½ΡΡ ΠΈ Π°Π½ΡΠΈΠΎΠΊΡΠΈΠ΄Π°Π½ΡΠ½ΡΡ Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ.Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. ΠΠ°ΠΉΠ΄Π΅Π½Ρ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΠ΅ ΡΡΠ»ΠΎΠ²ΠΈΡ ΡΠΊΡΡΡΠ°ΠΊΡΠΈΠΈ Π΄Π»Ρ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ ΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ ΡΠ»Π°Π²ΠΎΠ½ΠΎΠΈΠ΄ΠΎΠ² (530 ΠΌΠ³ ΠΊΠ²Π΅ΡΡΠ΅ΡΠΈΠ½Π°/Π³): Π²ΡΠ΅ΠΌΡ ΡΠΊΡΡΡΠ°ΠΊΡΠΈΠΈ 60 ΠΌΠΈΠ½, ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ° 53 Β°Π‘, ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠ΅ ΠΆΠΈΠ΄ΠΊΠΎΡΡΡ : ΡΠ²Π΅ΡΠ΄ΠΎΠ΅ Π²Π΅ΡΠ΅ΡΡΠ²ΠΎ 9.46 Π³/Π³ ΠΈ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΡ ΡΡΠ°Π½ΠΎΠ»Π° 62%. Π Π°ΡΡΠΈΡΠ΅Π»ΡΠ½ΡΠΉ ΡΠΊΡΡΡΠ°ΠΊΡ, ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΠΉ Π² ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΡ
ΡΡΠ»ΠΎΠ²ΠΈΡΡ
, ΠΏΡΠΎΡΠ²Π»ΡΠ΅Ρ Ρ
ΠΎΡΠΎΡΠ΅Π΅ ΠΈΠ½Π³ΠΈΠ±ΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ Ξ±-Π³Π»ΡΠΊΠΎΠ·ΠΈΠ΄Π°Π·Ρ Ρ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠ΅ΠΉ ΠΏΠΎΠ»ΡΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΈΠ½Π³ΠΈΠ±ΠΈΡΠΎΠ²Π°Π½ΠΈΡ (IC50) 22.67 ΠΌΠ³/ΠΌΠ» ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ ΠΏΠΎΠ»ΠΎΠΆΠΈΡΠ΅Π»ΡΠ½ΡΠΌ ΠΊΠΎΠ½ΡΡΠΎΠ»Π΅ΠΌ (Π°ΠΊΠ°ΡΠ±ΠΎΠ·Π° β 7.77 Π³/ΠΌΠ»). ΠΡΠ²ΠΎΠ΄Ρ. ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ Π²ΡΡΠ²ΠΈΠ»ΠΎ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΠ΅ ΡΡΠ»ΠΎΠ²ΠΈΡ ΡΠΊΡΡΡΠ°ΠΊΡΠΈΠΈ P. pulchra, ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡΠΈΠ΅ ΠΏΠΎΠ»ΡΡΠΈΡΡ Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ Π²ΡΡΠΎΠΊΠΎΠ΅ ΠΎΠ±ΡΠ΅Π΅ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠ΅ ΡΠ»Π°Π²ΠΎΠ½ΠΎΠΈΠ΄ΠΎΠ², ΠΈ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠ΄ΠΈΠ»ΠΎ ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ P. pulchra Π΄Π»Ρ ΠΈΠ½Π³ΠΈΠ±ΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ Ξ±-Π³Π»ΡΠΊΠΎΠ·ΠΈΠ΄Π°Π·Ρ ΠΈ Π°Π½ΡΠΈΠΎΠΊΡΠΈΠ΄Π°Π½ΡΠ½ΠΎΠ³ΠΎ ΠΎΠΊΠΈΡΠ»Π΅Π½ΠΈΡ
The Landau Pole and decays in the 331 bilepton model
We calculate the decay widths and branching ratios of the extra neutral boson
predicted by the 331 bilepton model in the framework of two
different particle contents. These calculations are performed taken into
account oblique radiative corrections, and Flavor Changing Neutral Currents
(FCNC) under the ansatz of Matsuda as a texture for the quark mass matrices.
Contributions of the order of are obtained in the branching
ratios, and partial widths about one order of magnitude bigger in relation with
other non- and bilepton models are also obtained. A Landau-like pole arise at
3.5 TeV considering the full particle content of the minimal model (MM), where
the exotic sector is considered as a degenerated spectrum at 3 TeV scale. The
Landau pole problem can be avoid at the TeV scales if a new leptonic content
running below the threshold at TeV is implemented as suggested by other
authors.Comment: 20 pages, 5 figures, LaTeX2
On the complexity of strongly connected components in directed hypergraphs
We study the complexity of some algorithmic problems on directed hypergraphs
and their strongly connected components (SCCs). The main contribution is an
almost linear time algorithm computing the terminal strongly connected
components (i.e. SCCs which do not reach any components but themselves).
"Almost linear" here means that the complexity of the algorithm is linear in
the size of the hypergraph up to a factor alpha(n), where alpha is the inverse
of Ackermann function, and n is the number of vertices. Our motivation to study
this problem arises from a recent application of directed hypergraphs to
computational tropical geometry.
We also discuss the problem of computing all SCCs. We establish a superlinear
lower bound on the size of the transitive reduction of the reachability
relation in directed hypergraphs, showing that it is combinatorially more
complex than in directed graphs. Besides, we prove a linear time reduction from
the well-studied problem of finding all minimal sets among a given family to
the problem of computing the SCCs. Only subquadratic time algorithms are known
for the former problem. These results strongly suggest that the problem of
computing the SCCs is harder in directed hypergraphs than in directed graphs.Comment: v1: 32 pages, 7 figures; v2: revised version, 34 pages, 7 figure
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