The paper presents the benefits of using 3D printing technology as an effective way to increase the rigidity of thin-walled bars subjected to non-free torsion. The first part of the article concerns ...bending and torsion testing of C thin-walled unstiffened and longitudinally stiffened profiles. The proprietary solution made with 3D printing technology was used as the longitudinal stiffening. The impact of a stiffener used on bending – torsional displacements in selected profile sections was assessed. The results of experimental research and numerical analysis made with the finite element method were compared. Based on numerical simulations and experimental tests carried out, it can be stated that the stiffener that was used increases the flexural and torsional stiffness of thin-walled profiles. In the second part of the work, in order to present the legitimacy of the discussed topic, the impact of the disassembly of the outer plating in the storey of a single-story structure of a single-family building made of light steel framework technology on its stability is shown. For this purpose, three various calculation were assumed for the adopted object, whose models were subjected to numerical analysis by the finite element method. The analysis took into account possible charges to occur in accordance with the regulations in force in Poland. Due to the analysis of the building model without stiffening plating on the ground floor, it was confirmed that the displacement limits specified in the standards were exceeded. The study showed that the self-wedging assembly insert developed in 3D printing technology developed by the authors is an effective way to increase the rigidity of non-free torsion of C-type steel thin-walled profiles and is used in renovation and repair works when there is a need to stiffen a building block following the removal of wall sheathing.
In the
N
= 1 supersymmetric extension of the Standard Model, neutralinos associated in supermultiplets with the neutral electroweak gauge and Higgs bosons are, as well as gluinos, Majorana fermions. ...They can be paired with the Majorana fermions of novel gaugino/scalar supermultiplets, as suggested by extended
N
= 2 supersymmetry, to Dirac particles. Matter fields are not extended beyond the standard
N
= 1 supermultiplets in
N
= 1/
N
= 2 hybrid supersymmetry to preserve the chiral character of the theory. Complementing earlier analyses in the color sector, central elements of such an electroweak scenario are analyzed in the present study. The decay properties of the Dirac fermions
and of the scalar bosons
σ
are worked out, and the single and pair production-channels of the new particles are described for proton collisions at the LHC, and electron/positron and
γγ
collisions at linear colliders. Special attention is paid to modifications of the Higgs sector, identified with an
N
= 2 hypermultiplet, by the mixing with the novel electroweak scalar sector.
Neutralino dark matter in the USSM Kalinowski, J; King, S.F; Roberts, J.P
The journal of high energy physics,
01/2009, Letnik:
2009, Številka:
1
Journal Article
Water assessment using ultra-weak bioluminescence Cordeiro, A.C.; Fabris, J.L.; Couto, G.H. ...
Journal of photochemistry and photobiology. B, Biology,
December 2017, 2017-Dec, 2017-12-00, 20171201, Letnik:
177
Journal Article
Recenzirano
In this paper a method to evaluate the presence of microorganisms of the coliform group in water samples using the ultra-weak bioluminescence (UWB) is proposed. A series of UWB measurements and ...optical density measurements from cultures of both a set of standard E. coli strain samples, and a set of water samples from a river near Curitiba City in Brazil were performed. All samples were previously incubated at 37°C for 11h in nutritive medium before the temporal UWB emission profiles data were acquired for a period of 24h inside a dark chamber of an especially implemented instrumentation capable of doing photon counting measurements. For the optical density measurements, a spectrophotometer was used to acquire the growth kinetics of those cultures for a period of 13h, and the results compared to the UWB profiles. Periodic time-components analysis of the UWB data from both the set of standard E. coli samples and the set of the river's water samples were performed and compared to each other. The results have shown that the UWB temporal profiles resemble in some way the growth kinetics curve and the periodic time-components analysis is an effective way to discriminate between contaminated and non-contaminated samples, therefore the method may be viable for detecting coliforms in water samples in less time than usual methods.
•Two series of tests in triplicate, using standard E. coli and river's water done.•Samples incubated in EC medium for 11h at 37°C, and growth kinetics acquired.•We acquired the ultra-weak photon emission profiles of those samples for 24h.•We done comparative analysis from both set of data acquired.•The analysis of the data seems a viable method in detecting coliforms in water.
Abstract Extreme prolongations, which can begenerated via extreme delayed auditory feedback (DAF) (e.g., 250-500 ms) or mediated cognitively with timing applications (e.g., analog stopwatch) at 2 ...seconds per syllable, have long been behavioral techniques used to inhibit stuttering. Some therapies have used this rate solely to establish initial fluency, while others use extremely slowed speech to establish fluency and add other strategic techniques such as easy onsets and diaphragmatic breathing. Extreme prolongations generate effective, efficient, and immediate forward flowing fluent speech, removing the signature behaviors of discrete stuttering (i.e., syllable repetitions and audible and inaudible postural fixations). Prolonged use of extreme prolongations establishes carry-over fluency, which is spontaneous, effortless speech absent of most, if not all, overt and covert manifestations of stuttering. The creation of this immediate fluency and the immense potential of extreme prolongationsto generate long periods of carry-over fluency have been overlooked by researchers and clinicians alike. Clinicians depart from these longer prolongation durations as they attempt to achieve the same fluent results at a near normal rate of speech. Clinicians assume they are re-teaching fluency and slow rates will give rise to more normal rates with less control, but without carry-over fluency, controls and cognitive mediation are always needed for the inherently unstable speech systems of persons who stutter to experience fluent speech. The assumption being that the speech system is untenable without some level of cognitive and motoric monitoring that is always necessary. The goal is omnipresent “near normal rate sounding fluency” with continuous mediation via cognitive and motoric processes. This pursuit of “normal sounding fluency” continues despite ever-present relapse. Relapse has become so common that acceptance of stuttering is the new therapy modality because relapse has come to be understood as somewhat inevitable. Researchers and clinicians fail to recognize that immediate amelioration of stuttering and its attendant carry-over fluency are signs ofa different pathway to fluency. In this path, clinicians focus on extreme prolongations and the extent of their carry-over. While fluency is automatically generated under these extreme prolongations, the realization is that communication at this rate in routine speaking tasks is not feasible. The perceived solution is a systematic reduction in the duration of these prolongations, which attempts to approximate “normal speech.” Typically, the reintroduction of speech at a normalized rate precipitates a laborious style that is undesirable to the person who stutters (PWS) and is discontinued, once departed from the comforts of the clinical setting. The inevitable typically occurs; the well-intentioned therapist instructs the PWS to focus on the techniques while speaking at a rate that is nearest normal speech, but the overlooked extreme prolongations are unlikely to ever be revisited. The foundation of this hypothesis is that the departure from fluency generators (e.g. extreme prolongations) is the cause of regression to the stuttering set point. In turn, we postulate that the continued use of extreme prolongations, as a solitary practice method, will establish and nurture different neural pathways that will create a modality of fluent speech, able to be experienced without cognitive or motoric mediation. This would therefore result in fewer occurrences of stuttering due to a phenomenon called carry-over fluency. Thus, we hypothesize that the use of extreme prolongations fosters neural pathways for fluent speech, which will result in carry-over fluency that does not require mediation by the speaker.
The box wing system is an unconventional way to connect the lifting surfaces that the designers willingly to use in prototypes of new aircrafts. The article present a way to quickly optimize the wing ...structure of box wing airplane that can be useful during conceptual design. At the beginning, there is presented theory and methods used to code optimization program. Structure analysis is based on FEM beam model, which is sufficient in conceptual design. Optimization is performed using hybrid method, connection of simple iteration and gradient descent methods. Finally, the program is validated by case study.
The Higgs sector is extended in R-symmetric supersymmetry theories by two iso-doublets Rd,u which complement the standard iso-doublets Hd,u. We have analyzed masses and interactions of these novel ...states and describe their non-standard decay modes and their production channels at the LHC and e+e− colliders.
Motivated by grand unified theories and string theories we analyze the general structure of the neutralino sector in the USSM, an extension of the minimal supersymmetric Standard Model that involves ...a broken extra U(1) gauge symmetry. This supersymmetric U(1)-extended model includes an Abelian gauge superfield and a Higgs singlet superfield in addition to the standard gauge and Higgs superfields of the MSSM. The interactions between the MSSM fields and the new fields are in general weak and the mixing is small, so that the coupling of the two subsystems can be treated perturbatively. As a result, the mass spectrum and mixing matrix in the neutralino sector can be analyzed analytically and the structure of this 6-state system is under good theoretical control. We describe the decay modes of the new states and the impact of this extension on decays of the original MSSM neutralinos, including radiative transitions in cross-over zones. Production channels in cascade decays at the LHC and pair production at
e
+
e
−
colliders are also discussed.
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