Real-Time Data Processing in the Muon System of the D0 Detector

This paper presents a real-time application of the 16-bit fixed point Digital Signal Processors (DSPs), in the Muon System of the D0 detector located at the Fermilab Tevatron, presently the world's highest-energy hadron collider. As part of the Upgrade for a run beginning in the year 2000, the system is required to process data at an input event rate of 10 KHz without incurring significant deadtime in readout. The ADSP21csp01 processor has high I/O bandwidth, single cycle instruction execution and fast task switching support to provide efficient multisignal processing. The processor's internal memory consists of 4K words of Program Memory and 4K words of Data Memory. In addition there is an external memory of 32K words for general event buffering and 16K words of Dual Port Memory for input data queuing. This DSP fulfills the requirement of the Muon subdetector systems for data readout. All error handling, buffering, formatting and transferring of the data to the various trigger levels of the data acquisition system is done in software. The algorithms developed for the system complete these tasks in about 20 microseconds per event.Comment: 4 pages, Presented and published at the 11th IEEE NPSS Real Time Conference, held at Santa Fe, New Mexico, USA, from June 14-18, 199

A 3-D Track-Finding Processor for the CMS Level-1 Muon Trigger

We report on the design and test results of a prototype processor for the CMS Level-1 trigger that performs 3-D track reconstruction and measurement from data recorded by the cathode strip chambers of the endcap muon system. The tracking algorithms are written in C++ using a class library we developed that facilitates automatic conversion to Verilog. The code is synthesized into firmware for field-programmable gate-arrays from the Xilinx Virtex-II series. A second-generation prototype has been developed and is currently under test. It performs regional track-finding in a 60 degree azimuthal sector and accepts 3 GB/s of input data synchronously with the 40 MHz beam crossing frequency. The latency of the track-finding algorithms is expected to be 250 ns, including geometrical alignment correction of incoming track segments and a final momentum assignment based on the muon trajectory in the non-uniform magnetic field in the CMS endcaps.Comment: 7 pages, 5 figures, proceedings for the conference on Computing in High Energy and Nuclear Physics, March 24-28 2003, La Jolla, Californi

Comparative evaluation of reconstructive procedures after gastrectomy with and without duodenal passage preservation in gastric cancer: a systematic review and meta-analysis

Background. Optimal reconstruction after gastrectomy (GE) in gastric cancer (GC) is currently a pressing issue, with research continuing to advance functional methods, especially those preserving duodenal passage, to improve the patient’s quality of life (QOL) and nutritional status (NS).Objectives. An evaluation of randomised clinical trials (RCTs) targeting GC patients with radical GE and comparing duodenal passage-preserving (DPP) and non-preserving (NDPP) reconstruction techniques in terms of immediate outcomes, post-gastrectomy syndrome, NS and QOL.Methods. Sources were mined in the PubMed, Cochrane Library, Google Scholar electronic databases, as well as CyberLeninka and eLibrary national resources. The RCTs meeting eligibility criteria (15 publications) were covered in a meta-analysis. Outcome variations were defined via odds ratio (OR), standard error estimated with 95% CI, statistical significance was assumed at p <0.05. Review Manager (RevMan v. 5.4., the Cochrane Collaboration, 2020) was used for statistical data processing.Results. A total of 15 RCTs were surveyed (1,766 patients; 722 in DPP and 1,044 in NDPP cohort). The complication and mortality rates did not differ significantly between cohorts. The meta-analysis elicited a significant advantage of DPP-GE regarding the dumping syndrome incidence at all post-surgery terms cumulatively (OR = 0.32 [95% CI: 0.22–0.48], p = 0.00001), as well as the 3- and 12-month terms, with no difference observed for 24 months. No statistically significant DPP vs. NDPP cohort variations have been found regarding reflux, stasis syndrome or NS values. The RCTs were evidently diverse with respect to QOL assessment techniques; 4 of 7 publications reported DPP advantages, and 3 — no significant variation in QOL between the DPP and NDPP cohorts.Conclusion. Further research is necessary to substantiate optimal reconstruction methods, particularly those restoring food passage through duodenum after GE, to facilitate the patient’s most favourable QOL and NS

Light-cone gauge Hamiltonian for AdS_4 x CP^3 superstring

It is developed the phase-space formulation for the Type IIA superstring on the AdS_4 x CP^3 background in the kappa-symmetry light-cone gauge for which the light-like directions are taken from the D=3 Minkowski boundary of AdS_4. After fixing bosonic light-cone gauge the superstring Hamiltonian is expressed as a function of the transverse physical variables and in the quadratic approximation corresponds to the light-cone gauge-fixed IIA superstring in flat space.Comment: 12 pages, LaTeX; v2 minor improvements of the text, misprints corrected, reference added; v3: missing terms in Eqs.(8),(53) and (56) adde

Scaling Analysis of Defect Induced Structure of A6061 Alloy at Dynamic Strain Localization

Plastic strain localization and fracture of dynamically loaded metallic samples, occurred during plug formation, are investigated. These processes are closely related to the instability of plastic flow and can be attributed to structural-scaling transitions in mesodefect ensembles. The multiscale nature of defect structure allows us to use the fractal concept for quantitative analysis of both the fracture surface and the inner structure of a deformed material. The scaling properties of fracture surfaces are established in terms of the roughness index (Hurst exponent) as the characteristics of strain localization and fracture

Fast electrochemical membrane actuator:Design, fabrication and preliminary testing

An actuator based on water electrolysis with a fast change of voltage polarity is presented. It demonstrates a new actuation principle allowing significant increase the operation frequency of the device due to fast termination of the produced gas. The actuator consists of a working chamber with metallic electrodes and supplying channels filled with an electrolyte. The chamber is formed in a layer of SU-8 and covered by a flexible polydimethylsiloxane membrane, which deforms as the pressure in the chamber increases. Design, fabrication procedure, and first tests of the actuator are described