Somatic embryogenesis in two Iranian date palm cultivars

Shoot tips were removed from 3 to 4 year-old offshoots of adult date palm (Phoenix dactylifera L. cv. Khanizi and Mordarsing) and were cultured on medium that consisted of Murashige and Skoog basal salts medium. After 12 months they were transferred to three different treatments of growth regulators. Five months later, cv. Khanizi produced embryogenic callus on a medium containing 453 ìM 2,4- dichlorophenoxyacetic acid (2,4-D), 15 ìM N2-(2-isopentenyl)adenine (2ip), and 13 ìM 6-benzyl amino purine. This callus was subcultured to another medium that was supplemented with 54 ìM NAA and 148 ìM 2ip. At this stage the embryos grew into plantlets. The cv. Mordarsing explants, on a medium containing 679 ìM 2,4-D and 15 ìM 2ip, produced embryogenic callus but the embryos remained in the globular stage

Preliminary study on end-effector compliance in automated fluid coupling for trains

The whole Proceedings of TMCE 2020 are available for open access at https://tmce.io.tudelft.nl/proceedingsIn order to improve train availability and workplace safety standards, the rail industry is keen to modernise maintenance of trains through increased use of Robotic Autonomous Systems (RAS). Our research aims to address the mechanical challenges of automated fluid coupling in future applications of train-fluid servicing. Depending on the intricacy of the servicing RAS, a degree of misalignment will always exist between the robot end-effector and train fluid ports. Compliant end-effectors can generate flexing motions that facilitate misaligned insertions. Present work focuses on understanding the role of passive compliance within the end-effector of our demonstrator train-fluid servicing robot. Physical experiments were performed and using Design of Experiments we identify the effect of end-effector compliance parameters on misaligned insertions. Results show that maximum insertion force and work done increase exponentially with increasing misalignment. Certain arrangements of compliance parameters can significantly improve the coupling performance under misalignments. Nonetheless, forces observed are still too large and our research will continue to develop compliant end-effectors for better automated coupling that will reduce RAS force requirements.Rail Safety and Standards Board (RSSB

Preliminary Study of End-Effector Compliance for Reducing Insertion Force in Automated Fluid Coupling for Trains

Rail Safety and Standards Board (RSSB) (contract RSSB 2675)

Reduction Operators of Linear Second-Order Parabolic Equations

The reduction operators, i.e., the operators of nonclassical (conditional) symmetry, of (1+1)-dimensional second order linear parabolic partial differential equations and all the possible reductions of these equations to ordinary differential ones are exhaustively described. This problem proves to be equivalent, in some sense, to solving the initial equations. The ``no-go'' result is extended to the investigation of point transformations (admissible transformations, equivalence transformations, Lie symmetries) and Lie reductions of the determining equations for the nonclassical symmetries. Transformations linearizing the determining equations are obtained in the general case and under different additional constraints. A nontrivial example illustrating applications of reduction operators to finding exact solutions of equations from the class under consideration is presented. An observed connection between reduction operators and Darboux transformations is discussed.Comment: 31 pages, minor misprints are correcte

Nonisospectral integrable nonlinear equations with external potentials and their GBDT solutions

Auxiliary systems for matrix nonisospectral equations, including coupled NLS with external potential and KdV with variable coefficients, were introduced. Explicit solutions of nonisospectral equations were constructed using the GBDT version of the B\"acklund-Darboux transformation

Group classification of (1+1)-Dimensional Schr\"odinger Equations with Potentials and Power Nonlinearities

We perform the complete group classification in the class of nonlinear Schr\"odinger equations of the form $i\psi_t+\psi_{xx}+|\psi|^\gamma\psi+V(t,x)\psi=0$ where $V$ is an arbitrary complex-valued potential depending on $t$ and $x,$ $\gamma$ is a real non-zero constant. We construct all the possible inequivalent potentials for which these equations have non-trivial Lie symmetries using a combination of algebraic and compatibility methods. The proposed approach can be applied to solving group classification problems for a number of important classes of differential equations arising in mathematical physics.Comment: 10 page

Multidimensional simple waves in fully relativistic fluids

A special version of multi--dimensional simple waves given in [G. Boillat, {\it J. Math. Phys.} {\bf 11}, 1482-3 (1970)] and [G.M. Webb, R. Ratkiewicz, M. Brio and G.P. Zank, {\it J. Plasma Phys.} {\bf 59}, 417-460 (1998)] is employed for fully relativistic fluid and plasma flows. Three essential modes: vortex, entropy and sound modes are derived where each of them is different from its nonrelativistic analogue. Vortex and entropy modes are formally solved in both the laboratory frame and the wave frame (co-moving with the wave front) while the sound mode is formally solved only in the wave frame at ultra-relativistic temperatures. In addition, the surface which is the boundary between the permitted and forbidden regions of the solution is introduced and determined. Finally a symmetry analysis is performed for the vortex mode equation up to both point and contact transformations. Fundamental invariants and a form of general solutions of point transformations along with some specific examples are also derived.Comment: 21 page

Multi-level fast multipole BEM for 3-D elastodynamics

To reduce computational complexity and memory requirement for 3-D elastodynamics using the boundary element method (BEM), a multi-level fast multipole BEM (FM-BEM) based on the diagonal form for the expansion of the elastodynamic fundamental solution is proposed and demonstrated on numerical examples involving single-region and multi-region configurations where the scattering of seismic waves by a topographical irregularity or a sediment-filled basin is examined

Type 1 diabetes genetic risk score discriminates between monogenic and Type 1 diabetes in children diagnosed at the age of < 5 years in the Iranian population

This is the final version. Available on open access from Wiley via the DOI in this recordAim To examine the extent to which discriminatory testing using antibodies and Type 1 diabetes genetic risk score, validated in European populations, is applicable in a non‐European population. Methods We recruited 127 unrelated children with diabetes diagnosed between 9 months and 5 years from two centres in Iran. All children underwent targeted next‐generation sequencing of 35 monogenic diabetes genes. We measured three islet autoantibodies (islet antigen 2, glutamic acid decarboxylase and zinc transporter 8) and generated a Type 1 diabetes genetic risk score in all children. Results We identified six children with monogenic diabetes, including four novel mutations: homozygous mutations in WFS1 (n=3), SLC19A2 and SLC29A3, and a heterozygous mutation in GCK. All clinical features were similar in children with monogenic diabetes (n=6) and in the rest of the cohort (n=121). The Type 1 diabetes genetic risk score discriminated children with monogenic from Type 1 diabetes [area under the receiver‐operating characteristic curve 0.90 (95% CI 0.83–0.97)]. All children with monogenic diabetes were autoantibody‐negative. In children with no mutation, 59 were positive to glutamic acid decarboxylase, 39 to islet antigen 2 and 31 to zinc transporter 8. Measuring zinc transporter 8 increased the number of autoantibody‐positive individuals by eight. Conclusions The present study provides the first evidence that Type 1 diabetes genetic risk score can be used to distinguish monogenic from Type 1 diabetes in an Iranian population with a large number of consanguineous unions. This test can be used to identify children with a higher probability of having monogenic diabetes who could then undergo genetic testing. Identification of these individuals would reduce the cost of treatment and improve the management of their clinical course.Wellcome TrustDiabetes U