Search results for "technical"

CRISPR-Cas12a-Based Detection of SARS-CoV-2 Harboring the E484K Mutation

2021

The novel respiratory virus SARS-CoV-2 is rapidly evolving across the world with the potential of increasing its transmission and the induced disease. Here, we applied the CRISPR-Cas12a system to detect, without the need of sequencing, SARS-CoV-2 genomes harboring the E484K mutation, first identified in the Beta variant and catalogued as an escape mutation. The E484K mutation creates a canonical protospacer adjacent motif for Cas12a recognition in the resulting DNA amplicon, which was exploited to obtain a differential readout. We analyzed a series of fecal samples from hospitalized patients in Valencia (Spain), finding one infection with SARS-CoV-2 harboring the E484K mutation, which was t…

Impacts of wood extraction on soil: assessing rutting and soil compaction caused by skidding and forwarding by means of traditional and innovative me…

2021

AbstractIntensive forestry operations may cause soil compaction, plastic soil disturbances and rutting, which are responsible for undesirable effects on soils, vegetation and water bodies. Despite the numerous studies aimed to identify the main factors affecting soil damages, it still remains unclear whether wood extraction methods and driving direction (uphill or downhill) may affect the impacts of forest machines. This research analyses soil compaction and soil penetration resistance as well as rutting from forwarding and skidding using the same farm tractor in up- and downhill wood extraction. Rutting was estimated by 3D soil reconstruction derived by portable laser scanning (PLS) and cl…

Study of new joining technique: flat clinching

2007

In this paper a development of clinching, called flat clinching, is presented. After a press clinching process, the joined sheets have been deformed by a punch with a lower diameter against a flat die. In this way a new configuration is created with a geometry that has no discontinuity on the external surface (bottom). A new procedure has also been tested: the second step is perfomed by pressing the joint between two flat dies. This second case has revealed itself to be very effective.Tensile tests have been done to compare the joints strength among the various joining techniques. Moreover some joints have been cut to analyse the changing of the contact line shape and how its characteristic…

Simplified Procedure to Evaluate Head Losses in Drip Irrigation Laterals

2005

The lateral lines of a drip irrigation system consist of pressurized pipelines with inline or online emitters. Proper hydraulic design of drip laterals usually requires the accurate evaluation of the total head losses, represented by friction losses along the pipe and the emitters, and local losses due to the emitter connections. This paper extends the local loss evaluation procedure, previously obtained for coextruded laterals, on the basis of new experiments. In addition, a simplified procedure was proposed based on the constant outlet discharge assumption for a quick evaluation of total head losses in drip irrigation lines, taking into account the total local loss due to the emitter conn…

Experimental Analysis of Local Pressure Losses for Microirrigation Laterals

2004

The accurate design of drip irrigation laterals needs to consider the variation of hydraulic head due to pipe elevation changes, head losses along the lines, and also, at a given operating pressure, emitter discharge variations related to manufacturing variability, clogging, and water temperature. Hydraulic head variations are consequent to both the friction losses and local losses due to the in-line or on-line emitters along the pipe, which determine the contraction and subsequent enlargement of the flow streamlines. Moreover, in-line emitters usually have a smaller diameter than the pipe, and therefore an additional friction loss must be considered. Evaluation of energy losses and consequ…

Influence of the porosity profile and sets of Ergun constants on the main hydrodynamic parameters in the trickle-bed reactors

2014

Abstract The Eulerian multiphase code has been applied for the comparative simulation of the experimental results obtained for varying flow rates of both fluid phases and for systems of various physicochemical properties used in the laboratory trickle-bed reactor (TBR). Therefore six different radial porosity profiles and three sets of the Ergun constants used in the relations defining the interphase momentum exchange have been implemented into the CFD code. The mean relative error of the pressure drop and of the averaged holdup as well as the standard deviation determined with respect to the experiments have been used as the criterion for the validation of the theoretical model. These valu…

Cualificación, socialización y terciarización

2018

During the last two decades the problem of skill has come to be a key theme in debates about active employment policies and strategies for economic modemization. In such debates the concept of skill tends to be employed in a manner which does not reflect its complexity. The article seeks to remedy this. First it makes the distinction between the socio-cultural and the technical/professional dimensions of the concept ( the technical/professional can be further broken down into explicit and tacit skills.). Secondly, the distinction is made between the skills of the worker (effective) and the skills associated with the job he/she occupies (nominal) and the possibility of a lack of fit between …

Process-oriented knowledge system for health professionals as a tool for transition to hospital process orientation

2016

AbstractHospitals face increasing pressure to reduce costs, improve efficiency, and guarantee a quality of services. This is perhaps the main reason why hospital process orientation (HPO) – a view on a hospital being a group of processes organized around patients with similar needs is a growing field of interest among hospital managers and researchers. The theoretical research of the content of hospital activities was performed in order to determine the main distinct characteristics in hospital organization that determine the specifics for a process-oriented knowledge system. A conceptual proposal of a technological tool was elaborated taking into account the limited control of hospital man…

How Can Steering Committees Manage Change Through Dynamic Capabilities to Increase System Satisfaction?

2017

A bargaining model of Farrell inefficiency

1998

Abstract An enormous number of empirical papers have estimated technical efficiency, the distance of firms inside a frontier, following the model of Farrell (Farrell, 1957. The measurement of productive efficiency. Journal of the Royal Statistical Society Series A 120 (3), 253–290). We propose a theory that explains the distance these empirical papers seek to measure. The theory is based on the idea that workers can bargain low `effort' (high crew sizes etc.) if they and the firm have some monopoly power. We provide simple theoretical expressions for the empirical measures of technical and allocative efficiency and compare them to those in the statistical literature. We also consider the re…