Revisit to Non-decoupling MSSM

Dipole operator $\bar{s}\sigma_{\mu\nu}F^{\mu\nu}b$ requires the helicity flip in the involving quark states thus the breaking of chiral $U(3)_{Q}\times U(3)_{d}$. On the other hand, the $b$-quark mass generation is also a consequence of chiral $U(3)_{Q}\times U(3)_{d}$ symmetry breaking. Therefore, in many models, there might be strong correlation between the $b\to s\gamma$ and $b$ quark Yukawa coupling. We use non-decoupling MSSM model to illustrate this feature. The light Higgs boson may evade the direct search experiments at LEPII or Tevatron while the 125 GeV Higgs-like boson is identified as the heavy Higgs boson in the spectrum. A light charged Higgs is close to the heavy Higgs boson which is of 125 GeV and its contribution to $b\to s \gamma$ requires large supersymmetric correction with large PQ and $R$ symmetry breaking. The large supersymmetric contribution at the same time significantly modifies the $b$ quark Yukawa co upling. With combined flavor constraints $B\to X_{s}\gamma$ and $B_{s}\to \mu^{+}\mu^{-}$ and direct constraints on Higgs properties, we find best fit scenarios with light stop of $\cal O$(500 GeV), negative $A_{t}$ around -750 GeV and large $\mu$-term of 2-3 TeV. In addition, reduction in $b\bar{b}$ partial width may also result in large enhancement of $\tau\tau$ decay branching fraction. Large parameter region in the survival space under all bounds may be further constrained by $H\to \tau\tau$ if no excess of $\tau\tau$ is confirmed at LHC. We only identify a small parameter region with significant $H\to hh$ decay that is consistent with all bounds and reduced $\tau\tau$ decay branching fraction.Comment: 18pages, 6 figure

6-Fluoro-1H-indole-3-carb­oxy­lic acid

In the title compound, C9H6FNO2, all the non-H atoms are approximately coplanar, the carb­oxy O atoms deviating by 0.0809 and −0.1279 Å from the indole plane. In the crystal, O—H⋯O hydrogen bonds link the mol­ecules into dimers which are linked via N—H⋯O hydrogen bonds and π–π inter­actions [centroid–centroid distance = 3.680 (2) Å

(Z)-4-(2-Hy­droxy­benzyl­idene)-1-methyl-2-phenyl-1H-imidazol-5(4H)-one

In the title compound, C17H14N2O2, the asymmetric unit comprises two mol­ecules that are comformationally similar [the dihedral angles between the phenyl rings in each are 46.35 (2) and 48.04 (3)°], with the conformation stabilized by intra­molecular O—H⋯N hydrogen bonds, which generate S(7) rings. In the crystal, inversion-related mol­ecules are linked by pairs of weak C—H⋯O hydrogen bonds, forming dimers with an R 2 2(16) graph-set motif. Weak inter-ring π–π stacking is observed in the structure, the shortest centroid-to-centroid distance being 3.7480 (13) Å

(E)-4-[(4-Diethyl­amino-2-hy­droxy­benzyl­idene)amino]­benzonitrile

The title compound, C18H19N3O, displays an E conformation with respect to the C=N double bond. The dihedral angle between the mean planes of the two benzene rings is 24.49 (3)°. An intra­molecular O—H⋯N hydrogen bond generates an S(6) ring. In the crystal, mol­ecules are linked by nonclassical inter­molecular C—H⋯O hydrogen bonds to form an infinite one-dimensional chain along [010], generating a C(8) motif

The Plant Heat Stress Transcription Factors (HSFs): Structure, Regulation, and Function in Response to Abiotic Stresses

Abiotic stresses such as high temperature, salinity and drought adversely affect the survival, growth and reproduction of plants. Plants respond to such unfavorable changes through developmental, physiological and biochemical ways, and these responses require expression of stress-responsive genes, which are regulated by a network of transcription factors (TFs), including heat stress transcription factors (HSFs). HSFs play a crucial role in plants response to several abiotic stresses by regulating the expression of stress-responsive genes, such as heat shock proteins (Hsps). In this review, we describe the conserved structure of plant HSFs, the identification of HSF gene families from various plant species, their expression profiling under abiotic stress conditions, regulation at different levels and function in abiotic stresses. Despite plant HSFs share highly conserved structure, their remarkable diversification across plants reflects their numerous functions as well as their integration into the complex stress signaling and response networks, which can be employed in crop improvement strategies via biotechnological intervention

Analytic study of superradiant stability of Kerr-Newman black holes under charged massive scalar perturbation

The superradiant stability of a Kerr-Newman black hole and charged massive scalar perturbation is investigated. We treat the black hole as a background geometry and study the equation of motion of the scalar perturbation. From the radial equation of motion, we derive the effective potential experienced by the scalar perturbation. By a careful analysis of this effective potential, it is found that when the inner and outer horizons of Kerr-Newman black hole satisfy $\frac{r_-}{r_+}\leqslant\frac{1}{3}$ and the charge-to-mass ratios of scalar perturbation and black hole satisfy $\frac{q}{\mu }\frac{Q}{ M}>1$, the Kerr-Newman black hole and scalar perturbation system is superradiantly stable.Comment: 7 pages, references adde

NETSTARS 模式加入橋墩沖刷功能之研究─以八掌溪為例

This study applies NETSTARS V3.0 by adding the calculation functions of eighteen pier scour formulas based on a comprehensive literature review to demonstrate local scour mechanisms. The study area is a reach of the Pachang Creek from the Housheng Bridge to the Chukou Bridge. We do not set the structures and weirs in the river to be scoured. Simulations are conducted by setting boundary conditions and importing information about nineteen bridges, and validations are separated into two steps as: general scouring and bridge local scouring. The best parameters are qualified by computing error evaluated parameter to fit the changing tendencies of the Pachang Creek. Finally, long-term riverbed evolution is simulated. The results show that there are 5 bridges with erosion trends. The results can be used as a reference for one-dimensional numerical models with pier scouring functions.本研究以NETSTARS V3.0 功能為基礎，根據橋墩沖刷研究，撰寫橋墩沖刷功能並新增18 個常用的橋墩沖刷公式於模式中。研究區域為八掌溪厚生橋至觸口橋河段。在輸砂模式建置上，將結構物設定為不可沖刷，並輸入邊界條件與現有19 座橋樑資訊，完成一般沖刷與局部沖刷階段之參數檢定，並利用誤差評估參數檢視最佳參數以反應八掌溪流域河床變遷趨勢。最後對未來十年河床沖淤進行預測，推測有沖刷趨勢的橋樑共5 座，研究成果可作為一維數值模式新增橋墩沖刷功能之參考

Study of Heating Time of test model and Application in Low Density Wind Tunnel Using Infrared Thermography

Abstract The relation between the model heating time and constant heat transfer rate assumption is analyzed. The study indicates that the shorter is the model heating time, the better is constant heat transfer rate approximation. The typical test results obtained with infrared thermographic technique on the hypersonic winged vehicle as well as heating effect on the flat plate model caused by plume flow are presented

Effect of ligustrazine injection on the change of oxidative stress system during renal ischemia reperfusion injury in rabbits

目的  通过由兔肾脏缺血/再灌注损伤（IRI）导致的氧化应激体系中的变化，研究中药川芎嗪对IRI干预下的作用机制。方法  建立持续性阻断兔双侧肾动脉血流1h，再灌注5h的肾IRI动物模型。日本大耳兔32只，随机分成3组（n=10）：假手术组(sham，S组)，缺血/再灌注组(ischemia-reperfusion，IR组)，川芎嗪干预缺血/再灌注组（ligustrazine+ ischemia-reperfusion，LZ组），另外两只作为补充实验中意外死亡之用。于缺血前、缺血1h、再灌注1h、3h和5h依次经颈总动脉抽血用以检测超氧化物歧化酶（SOD）活力、黄嘌呤氧化酶（XO）活力以及丙二醛（MDA）含量。在实验结束后取兔肾组织依次检测SOD、XO活力以及MDA含量，并对其进行电镜观察。结果  随着肾缺血和再灌注时间的增加，IR组和LZ组血浆中的XO活力和MDA含量逐渐呈上升趋势，但同时间点LZ组较于IR组明显降低（均P<0.01）；SOD活力随着肾缺血和再灌注时间的增加而逐渐呈下降趋势，但同时间点下，LZ组较于IR组均明显偏高（均P<0.01）。IR组和LZ组相较于S组，肾组织XO活力、MDA含量均明显升高，SOD活力均明显降低（均P<0.01）；而LZ组肾组织中的XO活力、MDA含量均显著低于IR组，SOD活力均显著高于IR组，差异有非常显著性（均P<0.01），LZ组肾组织细胞的超微结构异常改变较IR组显著减轻。结论  川芎嗪能够使氧自由基水平降低，氧化应激损伤减轻，具有保护肾缺血/再灌注损伤的作用。Objective: To investigate the change of oxidative stress system during renal ischemia-reperfusion injury, and to study the mechanism of Ligustrazine on IRI under the intervention. Methods: Establish the IRI animal model by persistent blocking rabbits’ bilateral renal artery blood flow for 1 hour, then reperfusion for another 5 hours. Japanese big ear rabbits, 32, were randomly divided into three groups (n=10): sham operation group (group S), ischemia/reperfusion group (group IR), the effect of ligustrazine on ischemia/ reperfusion group (LZ group), the other two being added in the experiment for accidental death. In 1 hour before ischemia, ischemia, reperfusion 1h, 3h and 5h in turn to check the enzyme activity of superoxide dismutase (SOD), xanthine oxidase (XO) and the content of malondialdehyde (MDA) by getting the blood from common carotid artery. At the end of the experiment, the rabbit’s kidney was used to check the enzyme activity of XO, SOD and the content of MDA, then to observe the morphological changes under the electron microscopy. Results: With the increase of renal ischemia and reperfusion time, XO activity and MDA content of IR group and LZ group in plasma gradually up, they were significantly lower in LZ group than in IR group at same time point (all P<0.01), the activity of SOD in plasma was shown a time-dependent decline in both IR group and LZ group, whereas it was significant higher in LZ group compared with IR group at same time point during ischemia reperfusion (all P<0.01). SOD activity gradually decreased with the increase of renal ischemia and reperfusion time, but at the same time point, LZ group compared with IR group were significantly higher (P<0.01), however, for LZ group, as compared with IR group, activity of XO, content of MDA were increased remarkably while activity of SOD was decreased significantly in kidney tissue (all P<0.01) the abnormal changes of ultrastructure were mitigated significantly. Conclusion: Ligustrazine may attenuate renal ischemia-reperfusion injury by dropping oxygen free radical generation and enhancing oxygen free radical scavenge so that it can antagonize oxidative stress