Clinical observation of phacoemulsification in patients with previous trabeculectomy

AIM: To observe the clinical effect of transparent corneal incision phacoemulsification in cataract patients who had undergone different kinds of glaucoma filtration surgeries.<p>METHODS: Totally 43 cases(50 eyes), in which 23 patients with primary angle-closure glaucoma(group A, 26 eyes)and 20 patients with primary open angle glaucoma(group B, 24 eyes), all had undergone glaucoma filtration surgery for more than 6 months. Visual acuity, intraocular pressure, slit lamp, gonioscope, corneal endothelial cell counts, <i>etc</i>., were done before surgery.And transparent corneal incision phacoemulsification combined with artificial lens implantation operation were preformed, postoperative follow-up of 3 to 12 months, visual acuity, intraocular pressure, corneal endothelial cell counts and vision field, <i>etc</i>. were observed and recorded.<p>RESULTS: The visual acuity of 50 eyes(100%)increased with different degree postoperatively, 41 eyes(82%)with postoperative visual acuity ≥0.3; average preoperative intraocular pressure: group A 18.08±5.08mmHg(1mmHg=0.133kpa), group B 14.48±3.52mmHg; Postoperative follow-up average intraocular pressure: group A 13.65±3.51mmHg, group B 14.28±3.41 mmHg, intraocular pressure changed significantly pre and post-operation in group A(<i>P</i><0.05), there was no significant difference between pre and post-operation in group B(<i>P</i>>0.05); Postoperative intraocular pressure of 1 eye in group A and 3 eyes in group B rose within three days post-operation, the intraocular pressure fluctuated between 21-33mmHg, with drug therapy and drug withdral when intraocular pressure epistrophy; Intraocular pressure was stable in the follow-up process.Corneal endothelial cell density: pre-operation group A was 2 293.57±352.24(cells/mm²), group B 2 658.14±458.69(cells/mm²), post- operation group A 2 175.95±379.16(cells/mm²), group B 2 442.97±477.30(cells/mm²), cell loss rate: 5.13% in group A, and 8.10% in group B. Postoperative visual acuity was related to vision field damage in patients, the more visual field damage, the longer the duration. <p>CONCLUSION: Visual function restore is stable in transparent corneal incision phacoemulsification in cataract patients who underwent glaucoma filtration surgeries; the intraocular pressure can be controlled effectively, and can further reduce the intraocular pressure of angle-closure glaucoma. Preoperative comprehensive evaluation of the affected eye and appropriate technique selection are benefit to the improvement of operation effect and the reduction of complications

Distributed Bootstrap for Simultaneous Inference Under High Dimensionality

We propose a distributed bootstrap method for simultaneous inference on high-dimensional massive data that are stored and processed with many machines. The method produces a $\ell_\infty$-norm confidence region based on a communication-efficient de-biased lasso, and we propose an efficient cross-validation approach to tune the method at every iteration. We theoretically prove a lower bound on the number of communication rounds $\tau_{\min}$ that warrants the statistical accuracy and efficiency. Furthermore, $\tau_{\min}$ only increases logarithmically with the number of workers and intrinsic dimensionality, while nearly invariant to the nominal dimensionality. We test our theory by extensive simulation studies, and a variable screening task on a semi-synthetic dataset based on the US Airline On-time Performance dataset. The code to reproduce the numerical results is available at GitHub: https://github.com/skchao74/Distributed-bootstrap.Comment: arXiv admin note: text overlap with arXiv:2002.0844

Depth classification of underwater targets based on complex acoustic intensity of normal modes

In order to solve the problem of depth classification of the underwater target in a very low frequency acoustic field, the active component of cross spectra of particle pressure and horizontal velocity (ACCSPPHV) is adopted to distinguish the surface vessel and the underwater target. According to the effective depth of a Pekeris waveguide, the placing depth forecasting equations of passive vertical double vector hydrophones are proposed. Numerical examples show that when the sum of depths of two hydrophones is the effective depth, the sign distribution of ACCSPPHV has nothing to do with horizontal distance; in addition, the sum of the first critical surface and the second critical surface is equal to the effective depth. By setting the first critical surface less than the difference between the effective water depth and the actual water depth, that is, the second critical surface is greater than the actual depth, the three positive and negative regions of the whole ocean volume are equivalent to two positive and negative regions and therefore the depth classification of the underwater target is obtained. Besides, when the 20 m water depth is taken as the first critical surface in the simulation of underwater targets (40 Hz, 50 Hz, and 60 Hz respectively), the effectiveness of the algorithm and the correctness of relevant conclusions are verified, and the analysis of the corresponding forecasting performance is conducted.National Natural Science Foundation (China) (Grants 1404406, 51179034, 41072176 and 11204109)Public Science and Technology Research Funds Projects of Ocean (Grant 201405036-4)China Postdoctoral Science Foundation (Grant 2013M531015)Defense Technology Research (Grant JSJC2013604C012

{Bis[2-(diphenyl­phosphino)phen­yl] ether-κ2 P:P′}(dimethyl 2,2′-biphenyl-4,4′-dicarboxyl­ate-κ2 N:N′)copper(I) hexa­fluorido­phosphate acetonitrile solvate

In the title compound, [Cu(C14H12N2O4)(C36H28OP2)]PF6·CH3CN, the Cu(I) ion is coordinated by two N atoms from the dimethyl 2,2′-biphenyl-4,4′-dicarboxyl­ate ligand and two P atoms from the bis­[2-(diphenyl­phosphino)phen­yl] ether ligand in a distorted tetra­hedral environment. In the cation, the short distance of 3.870 (4) Å between the centroids of the benzene and phenyl rings suggests the existence of intra­molecular π–π inter­actions