Treatment of complex traumatic retina detachment

Dear Sir, I am Dr Zhe Song, from Department of Ophthalmology of Dongfang Hospital Affiliated to Beijing University of Chinese Medicine in Beijing, China. I write to present a case report of the treatment of complex traumatic retina detachment, which has three huge breaks. A 35-year-old man, who was knocked down and hurt his right eye while playing football, complained of blur vision for a day. The visual acuity were 4/20 OD and 10/20 OS. The corrected visual acuity were 4/20 OD and 10/20 OS. The intraocular pressure were 12mmHg OD and 13mmHg OS. There was blood in the central vitreous of the right eye. One giant break and three nail type breaks were found in the temple retina. The temple retina detached, yet the macular area was not involved (Figure 1). And the fundus of the left eye was normal. B ultrasonic scan showed the right eye temple retina detachment (Figure 2). VEP and ERG of the eyes were normal.

Assisted coiling techniques in treatment of intracranial complex aneurysms

Objective To investigate the application of assisted coiling techniques in the treatment of complex intracranial aneurysms. Methods From Jun. 2007 to Aug. 2010,36 patients with 41 complex intracranial aneurysms were treated by varient endovascular methods,including balloon, stent-assisted coiling and double microcatheter coilingtechniques. Results Among the

Energy efficiencies and CO_(2)emissions associated with lowtemperature separation technologies for the processing of formation fluid from the Achimov deposits

Three different technologies for the low-temperature separation(LTS)of gas condensate from the Achimov deposits in the Russian Urengoyskoe gas and condensate field were assessed using exergy analyses.The options examined included turbo-expansion and ejection.Thermomechanical exergy values were calculated for material streams and exergy losses and efficiencies were estimated for dedicated equipment used in the LTS.The lowest exergy loss of 4221.2 kW was obtained using turboexpansion and electricity cogeneration.The carbon release associated with each scenario was calculated while considering different production rates,technological parameters and natural decreases in wellhead pressure.The integral carbon footprint after 40 years of LTS operation was estimated for all cases.A classical ejector-based LTS scheme was shown to produce 1200 t of CO_(2)emissions over 40 years of operation.This same scheme combined with a turboexpander and electricity generator produced 59%less CO_(2)in the same period.An expansion-cogeneration LTS scheme was found to be the most effective and ecologically friendly among the various options based on this analysis.

Numerical simulation of a complex moving rigid body under the impingement of a shock wave in 3D

In this paper,we take a numerical simulation of a complex moving rigid body under the impingement of a shock wave in three-dimensional space.Both compressible inviscid fluid and viscous fluid are considered with suitable boundary conditions.We develop a high order numerical boundary treatment for the complex moving geometries based on finite difference methods on fixed Cartesian meshes.The method is an extension of the inverse Lax-Wendroff(ILW)procedure in our works(Cheng et al.,Appl Math Mech(Engl Ed)42:841-854,2021;Liu et al.)for 2D problems.Different from the 2D case,the local coordinate rotation in 3D required in the ILW procedure is not unique.We give a theoretical analysis to show that the boundary treatment is independent of the choice of the rotation,ensuring the method is feasible and valid.Both translation and rotation of the body are taken into account in this paper.In particular,we reformulate the material derivative for inviscid fluid on the moving boundary with no-penetration condition,which plays a key role in the proposed algorithm.Numerical simulations on the cylinder and sphere are given,demonstrating the good performance of our numerical boundary treatments.