(Z)-1-[4-Fluoro-2-(pyrrolidin-1-yl)phen­yl]-3-phenyl-2-(1H-1,2,4-triazol-1-yl)prop-2-en-1-one

In the title mol­ecule, C21H19FN4O, the triazole ring forms dihedral angles of 67.0 (1) and 59.6 (1)° with the phenyl and fluoro-substituted benzene rings, respectively. The dihedral angle between the phenyl ring and the fluoro-substituted benzene ring is 79.1 (1)°. The pyrrolidine ring is in a half-chair conformation. In the crystal, weak C—H⋯O and C—H⋯N hydrogen bonds connect mol­ecules into layers parallel to (001)

Poly[[aqua­bis(μ3-isonicotinato-κ3 O:O′:N)tris­(μ2-isonicotinato-κ3 O,O′:N)(nitrato-κO)bis­(μ4-oxalato-κ6 O 1,O 2:O 2:O 1′,O 2′:O 1′)dierbium(III)tetra­silver(I)] tetra­hydrate]

In the title coordination polymer, {[Ag4Er2(C6H4NO2)5(C2O4)2(NO3)(H2O)]·4H2O}n, each ErIII atom is coordinated in a bicapped trigonal–prismatic coordination geometry by three O atoms from two isonicotinate (IN) ligands, four O atoms from two oxalate ligands and one O atom from either a nitrate ion or a water mol­ecule, both of which are half-occupied over the same site. One AgI atom has a Y-shaped geometry defined by one N atom from one IN ligand, one O atom from another IN ligand and one O atom from an oxalate ligand. The other AgI atom is coordinated by two IN ligands and one O atom from an oxalate ligand. One of the IN ligands is disordered over an inversion center and forms a bridge between two centrosymmetric AgI ions. Due to the disorder, this IN ligand coordinates to the Ag atom through either the pyridyl N or the carboxyl­ate O atoms. The IN and oxalate ligands link the Er and Ag atoms into a three-dimensional coordination framework. O—H⋯O and C—H⋯O hydrogen bonds are observed in the crystal structure

Clinical observation on different nucleus delivery methods in small incision cataract surgery with non-phacoemulsification

AIM: To compare the clinical effect and characteristics of lens loop extracting nucleus method, water irrigation and nucleus fragmentation within anterior chamber in small incision cataract surgery with non-phacoemulsification. <p>METHODS:There were 324 cases(324 eyes)with senile cataract randomly divided into three groups, by the lens loop extracting nucleus method(group A), water irrigation(group B)and nucleus fragmentation within anterior chamber(group C), to complete the process of nucleus division. The time of nuclear removal, complication during operation, the degree of edema of corneal endothelium on the first day after the surgery and visual acuity after surgery were observed and recorded.<p>RESULTS:The average extracting nucleus time was 45s in lens loop(group A); 34s in water irrigation(group B)and 65s in manual fragmentation(group C).The differences of average time are statistically significant(<i>P</i><0.05), and the complications in lens loop and manual fragmentation mainly are iris trauma and posterior capsular rupture; the complication in the water irrigation is hyphema. Regarding corneal edema from 0 to 1degree, the difference between group A and group B, group B and group C were statistically significant(<i>P</i><0.05). The difference between group A and group C had no statistical significance(<i>P</i>>0.05).Regarding the visual acuity on the first day after surgery, the difference between group A and group C, group B and group C were statistically significant(<i>P</i><0.05), The visual acuity on the 7th day after surgery: the difference between group B and group C were statistically significant(<i>P</i><0.05). In terms of the visual acuity on 1 momth after surgery: three groups have no statistically significant difference(<i>P</i>>0.05).<p>CONCLUSION:Manual fragmentation has obvious advantages in removing nuclear above Ⅳ grade; The water irrigation method has fewer complications with low incidence of corner edema, which is more preferable in removing the nuclear below Ⅳ grade

Poly[[hemi-μ4-oxalato-hemi-μ2-oxalato-bis­(μ3-pyrazine-2-carboxyl­ato)neodymium(III)silver(I)] monohydrate]

In the title coordination polymer, {[AgNd(C5H3N2O2)2(C2O4)]·H2O}n, the NdIII atom is coordinated in a distorted monocapped square-anti­prismatic geometry by two O and two N atoms of two N,O-bidentate pyrazine-2-carboxyl­ate (2-pzc) ligands, four O atoms of two bidentate oxalate ligands, and one O atom of a monodentate carboxyl­ate group of a 2-pzc ligand. The AgI ion is coordinated in a distorted tetra­hedral geometry by two N atoms from two monodentate 2-pzc ligands, one O atom from one monodentate oxalate ligand and one O atom of a bridging carboxyl­ate group of a 2-pzc ligand. The oxalate anions link neighbouring neodymium(III) metal centres into Nd–oxalate chains, which are inter­connected by Ag(2-pyz)2 units, forming a three-dimensional polymeric framework. Inter­molecular O—H⋯O and C—H⋯O hydrogen bonds are observed in the crystal structure

Masses of doubly heavy tetraquark states with isospin = 12\frac{1}{2} and 1 and spin-parity 1+±1^{+\pm}

We apply the method of QCD sum rules to study the doubly heavy tetraquark states($QQ\bar{q}\bar{q}$) with the isospin $I = \frac{1}{2}$ and 1 and spin-parity $J^{PC}=1^{++}$ and $J^{PC}=1^{+-}$ by constructing all the $QQ\bar{q}\,\bar{q}$ tetraquark currents. The masses of the doubly bottom and charm tetraquark states are computed in the context of the two-point sum rule method incorporating the quark, gluon and mixed condensates up to dimension $10$. By the way, weak decay widths of the doubly bottom tetraquark $bb\bar{u}\bar{d}$ are also given.Comment: 12 pages, 15 figures. This article is created by revtex

Parallel Acceleration and Improvement of Gravitational Field Optimization Algorithm

The Gravitational Field Algorithm, a modern optimization algorithm, mainly simulates celestial mechanics and is derived from the Solar Nebular Disk Model (SNDM). It simulates the process of planetary formation to search for the optimal solution. Although this optimization algorithm has more advantages than other optimization algorithms in multi-peak optimization problems, it still has the shortcoming of long computation time when dealing with large-scale datasets or solving complex problems. Therefore, it is necessary to improve the efficiency of the Gravitational Field Algorithm (GFA). In this paper, an optimization method based on multi-population parallel is proposed to accelerate the Gravitational Field Algorithm. With the help of the parallel mechanism in MATLAB, the algorithm execution speed will be improved by using the parallel computing mode of multi-core CPU. In addition, this paper also improves the absorption operation strategy. By comparing the experimental results of eight classical unconstrained optimization problems, it is shown that the computational efficiency of this method is improved compared with the original Gravitational Field Algorithm, and the algorithm accuracy has also been slightly improved

Infrared Spectroscopic and Theoretical Investigations of Group 13 Oxyfluorides OMF2 and OMF (M = B, Al, Ga, In)

Group 13 oxyfluorides OMF2 were produced by the reactions of laser-ablated group 13 atoms M (M = B, Al, Ga and In) with OF2 and isolated in excess neon or argon matrices at 5 K. These molecules were characterized by matrix-isolation infrared spectroscopy and isotopic substitution experiments in conjunction with quantum-chemical calculations. The calculations indicate that the OMF2 molecules have a 2B2 ground state with C2v symmetry. The computed molecular orbitals and spin densities show that the unpaired electron is mainly located at the terminal oxygen atom. Oxo monofluorides OMF were only observed in solid argon matrices and exhibit a linear structure in the singlet ground state. The M−O bonding in the OMF molecules can be rationalized as highly polar multiple bonds based on the calculated bond lengths and natural resonance theory (NRT) analyses. In particular, the molecular orbitals of OBF exhibit the character of a triple bond B−O resulting from two degenerate electron-sharing π bonds and a O → B dative σ bond formed by the oxygen 2p lone pair which donates electron density to the boron empty 2p orbital

Endolymphatic sac tumor: case report and review of the literature

Endolymphatic sac tumor (ELST) is a rare neoplasm which can be encountered sporadically or in Von Hippel-Lindau (VHL) disease. Here we report a sporadic case of ELST in 31-year-old man. Neither the symptoms nor a family history of VHL disease were found in the patient. CT imaging demonstrated an expansile lytic lesion of the mastoid process of the left petrous bone. MR scanning revealed a 5.2 cm × 4.7 cm × 4.2 cm mass which showed hyperintensity on T1- and T2-weighted images. Histologic sections showed a papillary, cystic or glandular architecture. The papillary and glandular structures were lined by a single layer of flattened cuboidal-to-columnar cells. The stroma of the papillary fronds was richly vascularized and chronically inflamed. The tumor showed diffusely positive reactivity with cytokeratin (Pan), cytokeratin 19, cytokeratin 5/6, cytokeratin 7, EMA, vimentin, CD56, and NSE and also showed variable reactivity with glial fibrillary acidic protein (GFAP) and VEGF. The Ki-67 immunostain showed a proliferation index of < 1%. Because the mass was large, it was difficult to extirpate surgically. After surgery, the patient underwent gamma-knife radiosurgery for residual tumor. The findings indicate that ELST is a rare neoplasm with benign histopathological appearance and clinically destructive behavior. Because of the rarity of this tumor, it can easily be confused with other tumors such as paraganglioma, middle ear adenoma, adenocarcinoma, papillary carcinoma of thyroid or choroid plexus papilloma. Owing to its locally aggressive nature, it is difficult to extirpate surgically when it is large

Asicimbex Yan, Deng &amp;amp; Wei, a new genus with eight new species and four new combinations (Hymenoptera, Cimbicidae)

A new genus and eight new species of Cimbicinae from the East Asia are described: Asicimbex Yan, Deng &amp;amp; Wei gen. nov., A. concavicaputus Yan &amp;amp; Wei sp. nov., A. dengi Yan &amp;amp; Wei sp. nov., A. koreanus Yan &amp;amp; Wei sp. nov., A. lii Yan &amp;amp; Wei sp. nov., A. latistriatus Yan, Deng &amp;amp; Wei sp. nov., A. maculotegularis Yan &amp;amp; Wei sp. nov., A. nanjingensis Yan &amp;amp; Wei sp. nov. and A. shengi Yan &amp;amp; Wei sp. nov. Four new combinations are proposed: A. eous (Semenov, 1935) comb. nov., A. elminus (Li &amp;amp; Wu, 2003) comb. nov., A. ulmusvorus (Yang, 1996) comb. nov. and A. malaisei (Gussakovskij, 1947) comb. nov., all from Agenocimbex. The 12 known species of Asicimbex are separated into two species groups. Asicimbex stands between Agenocimbex Rohwer 1910 and Cimbex Olivier 1791. The differences between Asicimbex and Cimbex, Asicimbex and Palaeocimbex are discussed in detail. Descriptions, remarks, illustrations, a key to the known species of Asicimbex and a key to genera of Cimbicinae are provided. A. malaisei is confirmed as a valid species and recorded from China for the first time, with the female described for the first time. The distribution of the genus is also briefly discussed