Zig Zag Research Articles

Sterically controlled reductive oligomerisations of CO by activated magnesium(i) compounds: deltate vs. ethenediolate formation.

An extremely bulky, symmetrical three-coordinate magnesium(i) complex, [{(TCHPNacnac)Mg}2] (TCHPNacnac = [{(TCHP)NCMe}2CH]−, TCHP = 2,4,6-tricyclohexylphenyl) has been prepared and shown to have an extremely long Mg–Mg bond (3.021(1) Å) for such a complex. It was shown not to react with either DMAP (4-dimethylaminopyridine) or CO. Three unsymmetrical 1 : 1 DMAP adducts of less bulky Mg–Mg bonded species have been prepared, viz. [(ArNacnac)Mg–Mg(DMAP)(ArNacnac)] (ArNacnac = [(ArNCMe)2CH]− Ar = 2,6-xylyl (Xyl), mesityl (Mes) or 2,6-diethylphenyl (Dep)), and their reactivity toward CO explored. Like the previously reported bulkier complex, [(DipNacnac)Mg–Mg(DMAP)(DipNacnac)] (Dip = 2,6-diisopropylphenyl), [(DepNacnac)Mg–Mg(DMAP)(DepNacnac)] reductively trimerises CO to give a rare example of a deltate complex, [{(DepNacnac)Mg(μ-C3O3)Mg(DMAP)(DepNacnac)}2]. In contrast, the two smaller adduct complexes react with only two CO molecules, ultimately giving unusual ethenediolate complexes [{(ArNacnac)Mg{μ-OC(H) Created by potrace 1.16, written by Peter Selinger 2001-2019 ]]> C(DMAP−H)O}Mg(ArNacnac)}2] (Ar = Xyl or Mes). DFT calculations show the latter reactions to proceed via reductive dimerizations of CO, and subsequent intramolecular C–H activation of Mg-ligated DMAP by “zig–zag” [C2O2]2− fragments of reaction intermediates. Calculations also suggest that magnesium deltate complexes are kinetic products in these reactions, while the magnesium ethenediolates are thermodynamic products. This study shows that subtle changes to the bulk of the reacting 1 : 1 DMAP–magnesium(i) adduct complexes can lead to fine steric control over the products arising from their CO reductive oligomerisations. Furthermore, it is found that the more activated nature of the adduct complexes, relative to their symmetrical, three-coordinate counterparts, [{(ArNacnac)Mg}2], likely derives more from the polarisation of the Mg–Mg bonds of the former, than the elongated nature of those bonds.

3D-Printed Composite Bone Bricks For Large Bone Tissue Applications

This study investigates the use of low cost, customizable, biodegradable, polymer-ceramic composite porous structures (bone bricks) for large bone tissue regeneration. Different ceramic materials (hydroxyapatite (HA), β-tri-calcium phosphate (TCP) and Bioglass (45S5) were mixed with poly-ε-caprolactone (PCL). Bone bricks with different material compositions were produced using an extrusion-based additive manufacturing system. Produced bone bricks were morphologically and mechanically assessed. Results allowed to establish a correlation between scaffolds architecture and material composition and scaffolds performance. Reinforced scaffolds showed improved mechanical properties. Best mechanical properties were obtained with PCL/TCP bone bricks and topologies based on 38 double zig zag filaments and 14 spirals.

Multicolor Flag Game (MFG) as an alternative learning for adaptive students

Physical education is the component can unify the cultures, languages, and nations. One of the current issues in the physical activity can be shown in the adaptive student. The purpose of this study was to facilitate the deaf student to get correct information and motivation to attending and joining physical activity in their class. Multicolor Flag Game (MFG) was a Research and Development model. The physical fitness elements are running back and forth, zig zag running, and running past the obstacles. Total participants in the trial and test I was 8 students, 10 students in trial and test phase II, and total 15 students used in the final test. The results of trial and test in phase I showed two of three aspects were Very Good, but one aspect needs attention for the perfection of the results. Cognitive aspect showed 93%, affective aspect 94%, and psychomotor 83%. The result of trial and test phase II significantly different, cognitive aspect in the trial and test phase II was 96%, affective 94%, and psychomotor 87%. The percentage of final test in cognitive was 98%, affective 96%, and psychomotor 90%, and all aspects were in Very Good category. These Multicolor Flag Game makes the atmosphere being excited and help the deaf student attending and participating in physical education class without any reason. MFG can improve student learning outcomes in cognitive, affective, and psychomotor aspects. MFG also can be one of the solutions for the teacher to select the alternative game and may be used as a reference in teaching physical education.

Mimicking kidney re-absorption using microfluidics by considering hydrostatic pressure inside kidney tubules: structural and analytical study

Kidney failure is a common disease prevailing in the present generation. Renal disfunction inflict adverse effects on human health that are much fatal. Kidney failure has attracted great attention among the present scientific community. Thus, it is desirable to develop an implantable device to replace the failed kidney that could be partially possible with Kidney-on-Chip technology. This paper presents a Kidney-on-Chip model where size-dependent re-absorption of the kidney is majorly investigated by considering the implications of hydrostatic pressure. The device is comprised of two blood tubules separated by a main tubule in the Centre. The main tubule connects both the blood tubules by the means of transporting channels. The transporting channel allows the flow of solutes from the main tubule to blood tubules depending on size of the solutes. The hydrostatic effect can alter the functioning of the kidney by effecting the cytoskeleton arrangement of kidney cells. Employing hydrostatic effects into the device will make the model more compact and realistic. The analysis was made by employing hindrance in the form of bars arranged in zig–zag fashion in the main tubule forming stepwise structure. Simulation results of presented design have produced an outflow velocity of 9.12 × 10−5 m/s which is greater than 8.2 × 10−5 m/s without hydrostatic effect. The re-absorption rate has been improved from 50 to 55% which is desirable. The mathematical analysis was made to support the simulation results. Different studies were conducted on the device performance by changing the parameters that affect fluid flow such as inflow velocity, density, viscosity, capillary forces, and surface tension. The presented work can produce a bio-reactor for kidney-on-Chip applications with more realistic results.

Zig Zag AFM Protocol Reveals New Intermediate Folding States of Bacteriorhodopsin

Zig Zag AFM Protocol Reveals New Intermediate Folding States of Bacteriorhodopsin

Effect of plant spacing and type of P fertilizer on soil chemical properties and yield of maize on C type swampland South Kalimantan

Tidal swampland is one of the suboptimal lands need technology to increasethe yield of maize crops and soil quality. This study aimed to determine the effect of plant spacing and types of P fertilizer on the chemical properties of soil and maize yields, was carried out in type C tidal swampland, and arranged in factorial Randomized Completely Block Design (RCBD). The first factor was the plant spacing, consisting of legowo and zigzag planting system. The second factor was the application of P fertilizer types, namely 1000 kg ha−1 RPR, 250 kg ha−1 SP-36, 1000 kg ha−1 Guano Phosphate, and without P. The results showed that the treatments of P fertilizer type could increase the pH value and available P-nutrient content. Total N content at legowo plant spacing was higher than at zigzag spacing. The highest available K content in all treatments was at 60 days after planting. The zig zag spacing is significant in increasing maize yield by 30% compared to legowo spacing. The provision of RPR fertilizer increased maize yield significantly up to 20%. Therefore, the zigzag spacing and the provision of RPR fertilizer are recommended for maize cultivation in type C tidal swamplands.

Right-Angle Black Phosphorus Tunneling Field Effect Transistor

We report experimental demonstration of a right-angle black phosphorus (BP) tunneling field effect transistor (TFET). This device utilizes the effective mass anisotropy between the armchair (AC) and zigzag (ZZ) crystal orientations in BP as a means of inducing asymmetry between source and drain tunneling. As a result of this asymmetry, the BP TFET displays a higher ${I}_{ \mathrm{\scriptscriptstyle ON}} / {I}_{ \mathrm{\scriptscriptstyle OFF}}$ ratio by 2 orders of magnitude and steeper SS than BP TFETs oriented along either the AC or ZZ direction only.

Numerical study of thermal conductivity based on phosphorene anisotropy: Including [110] direction and related phosphorus nanotubes

Thermal transport anisotropy is proved as an intrinsic property of phosphorene in armchair (AC) and zigzag (ZZ) direction. Thermal conductivities along the [110] direction (ST) and its perpendicular direction (PS) are systematically studied using molecular dynamics (MD) simulations. Thermal transport tendency from large to small is in the order of ZZ, PS, ST, and AC. The accuracy of MD in describing anisotropy is proved by acoustic phonon dispersion, and the discrepancy of specific thermal conductivity from the first-principle calculation is mainly due to the mismatch of low-frequency optical phonons. There is an enhancement of thermal conductivity with uniaxial tensile strain along ST and PS direction. Potential energy distribution through atom vibration is chosen to describe strain effect from different calculation methods. Nanotubes rolling from phosphorene have a gentle decrease of thermal conductivity with finite length along the same direction. These results shed light on direction-dependent thermal transport properties of phosphorene along with the applicability in MD simulation.

Enhanced electron–phonon scattering in Janus MoSSe

Electron–phonon (e–ph) interaction in monolayer Janus MoSSe has been investigated using ab initio approach. We find that the asymmetric structure induced net dipole moment in MoSSe introduce an enhanced e–ph interaction compared to the symmetric MoS2. Through the mode resolved scattering analysis, we demonstrate that the out-of-plane optical mode in MoSSe contributing to the total e–ph scattering rates are much more than MoS2. Around the band edges, the maximum mean free paths (MFPs) of both electrons and holes along zigzag (ZZ) direction are found to be 4 nm in MoSSe, while the MFPs along armchair directions are significantly shorter than along ZZ direction, meaning the highly anisotropic transport properties in MoSSe.

Metallic edge states in zig-zag vertically-oriented MoS2 nanowalls

The remarkable properties of layered materials such as MoS2 strongly depend on their dimensionality. Beyond manipulating their dimensions, it has been predicted that the electronic properties of MoS2 can also be tailored by carefully selecting the type of edge sites exposed. However, achieving full control over the type of exposed edge sites while simultaneously modifying the dimensionality of the nanostructures is highly challenging. Here we adopt a top-down approach based on focus ion beam in order to selectively pattern the exposed edge sites. This strategy allows us to select either the armchair (AC) or the zig-zag (ZZ) edges in the MoS2 nanostructures, as confirmed by high-resolution transmission electron microscopy measurements. The edge-type dependence of the local electronic properties in these MoS2 nanostructures is studied by means of electron energy-loss spectroscopy measurements. This way, we demonstrate that the ZZ-MoS2 nanostructures exhibit clear fingerprints of their predicted metallic character. Our results pave the way towards novel approaches for the design and fabrication of more complex nanostructures based on MoS2 and related layered materials for applications in fields such as electronics, optoelectronics, photovoltaics, and photocatalysts.

Valley drift and valley current modulation in strained monolayer MoS2

Elastic-mechanical deformations are found to dramatically alter the electronic properties of monolayer (ML) $\mathrm{Mo}{\mathrm{S}}_{2}$; particularly, the low-energy Bloch bands are responsive to a directional strain. In this study, in-plane uniaxial deformation is found to drift the low-energy electron/hole valleys of strained $\mathrm{ML}\text{\ensuremath{-}}\mathrm{Mo}{\mathrm{S}}_{2}$ far away from $K/K'$ points in the Brillouin zone (BZ). The amount of drift differs notably from hole to electron bands, where the conduction band minimum (CBM) drifts nearly 2 times more than the valence band maximum (VBM) in response to a progressively increasing strain field (0--10%). The resulting strain-induced valley asymmetry/decoherence can lift the momentum degeneracy of valley carriers at the $K$ point, thereby affecting the low-energy valley excitations ($K$-valley polarization) in a strained $\mathrm{ML}\text{\ensuremath{-}}\mathrm{Mo}{\mathrm{S}}_{2}$ lattice. The quantum origin of this decoherent valley arises from the differences in the Bloch orbital wave functions of electron and hole states at the exciton band edges and their deformation under strain. A higher drift (g1.5 times) is noticed when strain is along the zigzag (ZZ) axis relative to the armchair (AC) axis, which is attributed to a faster decline in Young's modulus and Poisson's ratio (PR) along the ZZ direction. A similar valley drift only in the VBM of uniaxially strained $\mathrm{ML}\text{\ensuremath{-}}\mathrm{Mo}{\mathrm{S}}_{2}$ was reported in an earlier local density approximation (LDA) based density functional theory (DFT) study [Q. Zhang et al., Phys. Rev. B 88, 245447 (2013)], where a massive valley drift occurring at the CBM was fully overlooked. Moreover, the giant VBM drift reported therein is 6 times the drift observed in our DFT studies based on spin-orbit coupling (SOC) and Perdew-Burke-Ernzerhof generalized gradient approximation (PBE-GGA) functionals. The physical origin of valley drift has been ascertained in our thorough investigations. The robustness of our approach is substantiated as follows. With progressive increase in strain magnitude (0--10%), the band gap remains direct up to 2% uniaxial tensile strain, under SOC, which accurately reproduces the experimental strain-induced direct-to-indirect band gap transitions occurring at \ensuremath{\sim}2% strain. Based on LDA-DFT [Q. Zhang et al., Phys. Rev. B 88, 245447 (2013)], this crossover in band gap has been incorrectly reported to occur at a higher value of uniaxial strain of 4%. Moreover, the direct SOC band gap shows a linear redshift at a rate of 51--53 meV/(% of strain), under uniaxial tensile strain, which is in excellent quantitative agreement with experimentally observed rates in the redshift of direct excitonic transitions measured in several optical absorption and photoluminescence (PL) spectroscopy experiments. In addition, the Berry curvature \textohm{}($k$) of electron/hole bands gets significantly modulated in strained $\mathrm{ML}\text{\ensuremath{-}}\mathrm{Mo}{\mathrm{S}}_{2}$, where the intensity of the flux profile increases as a function of the magnitude of strain with an opposite drift around $K/K'$, when strained along the ZZ/AC direction. A strong strain-valley coupling leads to an enhancement in the strength of spin-orbit induced spin splitting of bands at VBM/CBM, which is sizably enhanced (\ensuremath{\sim}7 meV) simply by the strain-controlled orbital motions. Our findings are of prime importance in the valley physics of $\mathrm{Mo}{\mathrm{S}}_{2}$. Besides, the important theoretical insights emerging from this work will trigger further experimental investigations on $\mathrm{ML}\text{\ensuremath{-}}\mathrm{Mo}{\mathrm{S}}_{2}$ to realize its novel technological potential in nanoelectronics, spintronics, and valleytronics.

Zigzag lines and other protective patterns in Palaeolithic and Mesolithic art

This article contends that Stone Age art served a protective, magical purpose. Applied ornamental patterns to some extent were inspired by natural patterns taken from teeth, fur, shells and skins of particular animals, such as vipers, turtles and fawns, which were regarded as “magically” equipped. By wearing powerful animal body parts (like tooth pendants), or applying mimetic surface designs to amber amulets and “personal objects” like bone daggers and antler axes, the hunters tried to enact the supposed magical protection of such items for the persons using them.The Zig Zag ornaments of the Shigir Idol illustrate the importance of nonfigurative patterns in Mesolithic art, and this paper describes the abundance of zig zag patterns and snake symbolism on antler batons, clubs and bone daggers found at settlement sites and in burials belonging to the Maglemose, Kongemose and Ertebølle cultures of Southern Scandinavia.

Phonon limited anisotropic quantum transport in phosphorene field effect transistors

Electron-phonon coupling limited transport in phosphorene metal oxide semiconductor field effect transistors (MOSFETs) is studied along the armchair (AC) and zigzag (ZZ) directions. In a multiscale approach, the unit cell of phosphorene is first relaxed, and the band structure is calculated using hybrid density functional theory (DFT). The transport equations are then solved quantum mechanically under the nonequilibrium Green’s function formalism using DFT-calibrated two-band k⋅p hamiltonian. The treatment of electron-phonon scattering is done under the self-consistent Born approximation in conjunction with deformation potential theory. It is found that optical phonon modes are largely responsible for degradation of ON-current apart from p-channel AC MOSFET where acoustic phonon modes play a stronger role. It is further observed that electron-phonon scattering is more pronounced in the ZZ direction, whereas the diffusive ON-current of p-MOSFET in a given direction is higher than n-MOSFET. Further study on the complex band structure of phosphorene reveals band wrapping within the bandgap region in the AC direction and multiple crossings in the ZZ direction. This signifies strong phonon-assisted tunneling in the ZZ direction in comparison with the AC direction. For completeness, drain current in the AC tunnel field effect transistor is calculated, and electron-phonon scattering is observed only in the near vicinity of the OFF-current.

Potential of water natural circulation coupled with nano-enhanced PCM for PV module cooling

This paper introduces a new photovoltaic module passive cooling system that works with natural cooling water circulation. The heat was removed from cooling water by a PCM-based cooling system. A special zig zag geometry of PCM container was considered to increase the heat transfer surface. At the first stage of experiments, a composed oil consisting of 82 wt% coconut oil and 18 wt% sunflower oil was used as PCM. Then, in order to increase the performance of heat transfer between PCM and cooling water, the composed oil was mixed with Boehmite nanopowder (0.009 (w/w)). The cooling performance of the composed oil and nano - composed oil was assessed by monitoring the temperature and the generated electrical power of the panel at various radiation intensities. The results reveal the reliability of the proposed system for cooling of the PV module without need to any pumping system. Moreover, the results show that using nano - composed PCM is more efficient than the plain one. The highest increase in the maximum produced power relative to the reference case were obtained in the presence of nano - composed oil, which were 44.74, 46.63, 48.23% at the radiation intensities of 410,530,690 W/m2, respectively.

The effect of carbon nanotube chirality on the electrical conductivity of polymer nanocomposites considering tunneling resistance

In this study, the effect on the conductance of polymer nanocomposites considering quantum tunneling resistance is investigated with respect to the chirality of carbon nanotubes (CNTs) and uncertainties in the geometric parameters of CNTs by using Monte Carlo simulations. The random spatial placement for CNTs was accomplished with a one-dimensional line segment and the periodic boundary conditions were applied to CNTs in the two-dimensional representative volume element. Intersection points between each CNT were calculated to obtain connectivity lists of the connected network path. Both the intrinsic resistance of the CNT and the inter-CNT tunneling resistance were considered in this model. In addition, the in-house code developed was validated by comparison with several experimental datasets from the literature. Unlike past studies, uncertainties in the chiral index of single-wall CNTs concerning armchair and zig–zag structures have been considered here and the electrical conductivity and percolation threshold are predicted.

Autonomous multi-function floor cleaning robot with zig zag algorithm

<span>In this present era, people live a very busy life. People in cities have irregular and long working times. In such a situation a person will always find ways of saving time. Household chores are the ones that are most dreaded upon and cleaning a home tops the list. An autonomous floor cleaning robot is developed to help people to complete their cleaning task. This paper presents the development of an autonomous floor cleaning robot by using Arduino as a platform for processing and controlling the input and output. Autonomous vacuum cleaner robot is designed to make cleaning process become easier compared to using manual vacuum. The idea is basically by having the sensor to detect any object and send the input to Arduino that will control the robot movement. This robot can perform vacuum and wiping task with water spray function. It is also programmed to move in zigzag movement to ensure that the robot can clean all the corner of the house and avoid obstacle autonomously. This robot consists of three ultrasonic sensors, one infra-red (IR) sensor and two brushes in front of it to ensure effective cleaning. It is designed to run on flat surface. This autonomous multi-function floor cleaning robot has lower cost compared to existing vacuum robot on the shelves and is suitable for home and small premise usage.</span>

Ab initio study of electronic and transport anisotropy of two square and rectangle phosphorene nanoflakes

Two-dimensional (2D) phosphorene nanoflakes (PNFs) revealed different properties along two different crystal directions of zigzag (ZZ) and armchair (AM). In this study, the electronic and transport properties of two different structures of 4 × 4 square and 4 × 6 rectangle phosphorene nanoflakes with zigzag and armchair orientation were investigated. The zigzag 4 × 6 rectangle phosphorene nanoflake with six unit cells along zigzag direction was revealed to be metal whereas the corresponding armchair one with 6 unit cells along armchair direction was semiconductor. Transport study of nanoflakes showed the anisotropic behaviors at two transport directions of zigzag and armchair. Transmission coefficient of the phosphorene nanoflakes was found to be higher in the ZZ crystal direction compared to the AM and the anisotropy ratio of 6% and 95% was estimated for the square and rectangle PNF at Fermi energy, respectively.

Efficient 3D Stress Capture of Variable-Stiffness and Sandwich Beam Structures

Accurate modeling of composite structures is important for their safe application under different loading conditions. To provide accurate predictions of three-dimensional (3D) stress fields in an efficient computational framework, in this study, a modeling approach that builds upon the recently developed hierarchical Serendipity Lagrange finite elements (FEs) is employed. The approach provides layerwise (LW) and equivalent single-layer (ESL) models for analyzing constant- and variable-stiffness laminated beam structures. To enhance the capability of the ESL model, two zig-zag (ZZ) functions, namely, Murakami’s ZZ function (MZZF) and the refined ZZ theory function (RZT), are implemented. For constant-stiffness laminated and sandwich beams, the RZT ZZ function predicts the structural response more accurately than the MZZF. However, for variable-stiffness laminated structures, the applicability of RZT remains unknown and its accuracy is therefore tested within the present formulation. Results obtained are validated against 3D closed-form and 3D FE solutions available from the literature. For similar levels of accuracy, significant gains in computational efficiency are achieved over 3D FE and LW models by using the ESL approach with RZT ZZ functions.

Supramolecular architectures of metal-oxalato coordination polymers bearing N-tethered adenine nucleobases

Reactions of N-methylated adenine (9-methyladenine and 3-methyladenine) with water-soluble oxalato complexes in the presence of potassium oxalate yields a series of oxalato-bridged complexes with the nucleobases as pendant ligands whose crystal structures and magnetic properties are reported herein. The complexes [M2(µ-ox)2(9Meade)3]n [M(II) = Zn (1), Cu (2); where ox = oxalato and 9Meade = 9-methyladenine] are composed of infinite corrugated one-dimensional chains in which two types of metal(II) centres are sequentially bridged by asymmetric bis-bidentate oxalato ligands and their coordination polyhedra are filled by N7-coordinated 9-methyladenine molecules giving rise to two different chromophores: an octahedral N2O4 donor set with the nucleobase moieties in trans-arrangement, and square based pyramidal NO4 coordination polyhedra. The cohesiveness of their supramolecular 3D architectures is achieved by means of an extensive network of non-covalent interactions including a short contact between the minor groove N3 site of the model 9-methyladenine and the oxalato bridging ligand from a neighbouring chain. This unconventional interaction between the lone pair of the pyrimidinic nitrogen atom of the nucleobase and the π-system of the oxalate anion has been analysed and discussed in the light of available structural data for analogous systems. The compounds {[M(µ-ox)(H2O)(3Meade)]·H2O}n [M(II) = Zn (3), Co (4) and Mn (5); where 3Meade = 3-methyladenine], and {[Cu(µ-ox)(3Meade)2]·4H2O}n (6) are comprised of zig–zag metal-oxalato chains, with the oxalato adopting a symmetric bis-bidentate coordination mode. The octahedral environment of the metals is completed in a cis-arrangement by one water molecule and the imidazole N7 donor site of a 3-methyladenine ligand for 3–5, and by two N7-coordinated nucleobases for 6. The crystal packing of the chains leads to the presence of channels with dimensions of 5 × 10 Å for 6, and 4 × 6 Å for 3–5 which are occupied by crystallization water molecules. The non-covalent interactions of the nucleobases among them and with the metal-oxalato framework have been studied in detail as well as the magnetic interactions mediated by the bridging oxalato ligand.

VALIDITY OF NEW HANDBALL AGILITY TEST: ASSOCIATION WITH SPECIFIC SKILLS AND MUSCULAR EXPLOSIVE DETERMINANTS OF LOWER LIMBS IN YOUNG HANDBALL PLAYERS

The aims of the study were to assess the reliability and validity of a new handball agility test (HAT), and to evaluate the association between the test and the explosive performance measurements of lower limbs in young handball players. 72 young handball players (15.6 ± 0.4 years) participated in this study. All players conducted the HAT using a modified ZIG ZAG course consisting of three 5-m sections set out at 100° angles. Electronic timing gates were used to record completion times. To assess the reliability of the HAT, each player performed the tests twice, on separate days. The criterion validity of the HAT was determined by examining the relationship between the HAT performances and two popular agility tests performances (T-half test and the Illinois test). Participants also underwent measurements squat and counter-movement jumps, sprinting velocities on 5-m (V5) and 10-m (V10), and handball specific skill test (HST). The results showed no difference between test–retest HAT scores. Intra class reliability of the HAT was greater than 0.91 across the trials (0.92 and 0.97, respectively). The HAT was closely related to both the T-half test and Illinois agility tests (r= 0.52 and r = 0.68, p< 0.05). Relevant correlations were found between HAT, CMJ and SJ (r = 0.58 and r = 0.38 respectively; p<0.01). A very large association were also found between HAT and V5-m and V10-m (r = 0.60 and r = 0.55 respectively; p<0.01). The HAT constitutes a reliable and valid field tool for assessing short term running agility in young team handball players. Therefore, is very suitable for monitoring athletic performance of the lower-limbs in young handball players.