{Twisted Poincar\'e Series and Geometric Factorization of Affine Weyl Groups

We study the relation between the alternating product of twisted Poincar'e series of parabolic subgroups of affine Weyl groups and hyperbolic stabilizers of geodesic tubes. Moreover, from such relation, we find a length-preserving factorization of affine Weyl groups of type $\tilde{A}_n$ and $\tilde{C}_n$

The effect of anterior surgery for the patients with thoraclumbar-segment bursting fracture

目的  评价经前路手术治疗脊柱胸腰段爆裂性骨折的疗效。方法  对18例脊柱胸腰段爆裂性骨折的患者行前路手术治疗，手术后做6~48个月（平均14.6个月）的随访研究。结果  所有病例达到植骨融合，脊柱的高度、生理弧度恢复并保持较好，内固定无松动、断裂，除1例神经功能分级为A的患者神经功能没有明显恢复外，其他病例的神经功能都有1~3级的恢复。没有发生严重并发症的病例。结论  前路减压、植骨、内固定治疗脊柱胸腰段爆裂性骨折能彻底减压，充分植骨，稳定脊柱，有较好疗效。Obsjective: To evaluate the effect of anterior surgery for the patients with  thoraclumbar-segment bursting fracture. Methods: 13 patients with thoraclumbar-segment burstingfracture were treated through anterior surgery. After operation, the patients were followed-up for 6-24 months (average 15 months).According to Frankel’s grading of preoperation neurological lesions, 1 case was classified into A grade, 4cases into B grade, 8 cases into C grade, 4 cases into D grade, 1cases into Egrade. Results: All of the interbody autogenous strut graftings achieved solid fusion. The height and physiologic curve of vertebral column for all of the cases were recovered and maitained very well. Loosening and breaking for the internal fixations did not been found. Excepting the case of Frankel’s grade A, others achieved 1-3 grade recovering for nerve function. No serious complications were found. Conclusion: The treatment from anterior surgery for the patients with thoraclumbar-segment bursting fracture could achieve thorough decompressing, sufficient grafting-bone fusioning, stabling vertebral column and satisfactory outcome

Effect of ω-3 Fatty Acid on Gastrointestinal Motility after Abdominal Operation in Rats

Objective. To investigate whether ω-3 fatty acid could stimulate gastrointestinal motility after abdominal operation. Method. Wistar rats were randomly divided into 3 group (normal saline group, intralipid group, and ω-3 fatty acid group, n = 18/group) after partial caecectomy and gastrostomosis, each group was divided into 3 groups (POD1, POD3, and POD6, n = 6/group). Serum gastrin (GAS), motilin (MTL), interleukin-1 (IL-1), interleukin-6 (IL-6), tissue necrosis factor-α (TNF-α), cyclooxygenase-2 (COX-2), gastric emptying rate, and small bowel propulsion rate were measured. Results. On POD 3, gastric emptying rate and small bowel propulsion rate in ω-3 fatty acid group were higher than those in normal saline group and intralipid group. Serum GAS and MTL levels in ω-3 fatty acid group were higher than those in normal saline group, but serum IL-1, IL-6, TNF-α, and COX-2 levels were lower than those in normal saline group and intralipid group. Conclusion. ω-3 fatty acid could accelerate the recovery of gastrointestinal mobility after abdominal operation in rats, mainly by relieving postoperative inflammation

Shedding New Light on R(D(s)(∗)){\cal R} (D_{(s)}^{(\ast)} ) and ∣Vcb∣|V_{cb}| from Semileptonic Bˉ(s)→D(s)(∗)ℓνˉℓ\bar B_{(s)} \to D_{(s)}^{(\ast)} \ell \bar {\nu}_{\ell} Decays

We compute for the first time the next-to-leading-order QCD corrections to the $\bar B_{(s)} \to D_{(s)}^{(\ast)}$ form factors at large hadronic recoil. Both the charm-quark-mass and the strange-quark-mass dependent pieces can generate the leading-power contributions to these form factors. Including further various power-suppressed contributions, we perform the combined fits of the considered form factors to both our large-recoil theory predictions and the lattice QCD results, thus improving upon the previous determinations of the lepton-flavour-universality ratios ${\cal R} (D^{(\ast)})$ significantly.Comment: 6 pages plus Supplemental Material, 3 figures, 1 table, 2 ancillary file

Precision calculations of Bd,s→π,KB_{d, s} \to \pi, K decay form factors in soft-collinear effective theory

We improve QCD calculations of the $B_{d, s} \to \pi, K$ form factors at large hadronic recoil by implementing the next-to-leading-logarithmic resummation for the obtained leading-power light-cone sum rules in the soft-collinear effective theory (SCET) framework. Additionally, we endeavour to investigate a variety of the subleading-power contributions to these heavy-to-light form factors at ${\cal O}(\alpha_s^0)$, by including the higher-order terms in the heavy-quark expansion of the hard-collinear quark propagator, by evaluating the desired effective matrix element of the next-to-leading-order term in the ${\rm SCET_{I}}$ representation of the weak transition current, by taking into account the off-light-cone contributions of the two-body heavy-quark effective theory matrix elements as well as the three-particle higher-twist corrections from the subleading bottom-meson light-cone distribution amplitudes, and by computing the twist-five and twist-six four-body higher-twist effects with the aid of the factorization approximation. Having at our disposal the SCET sum rules for the exclusive $B$-meson decay form factors, we further explore in detail numerical implications of the newly computed subleading-power corrections by employing the three-parameter model for both the leading-twist and higher-twist $B$-meson distribution amplitudes. Taking advantage of the customary Bourrely-Caprini-Lellouch parametrization for the semileptonic $B_{d, s} \to \pi, K$ form factors, we then determine the correlated numerical results for the interesting series coefficients, by carrying out the simultaneous fit of the exclusive $B$-meson decay form factors to both the achieved SCET sum rule predictions and the available lattice QCD results.Comment: 74 pages, 15 figure