A guide to the identification of the more useful timbers of Nigeria, by Herbert Stone and H.A. Cox.

Cox, Henry Archibald; Stone, Herbert

doi:10.5962/bhl.title.27584

Cited by 3 publications

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“…Flow in a rectangular microchannel. For the general case of a channel with a rectangular crosssection, the axial velocity in the (y,z) plane of Figure 2 is known analytically in terms of a Fourier series [14]:…”

Section: Resultsmentioning

confidence: 99%

Luminescent and absorptive metal-coated emulsions for micro-velocimetry

Mesdjian

Chen

Fattaccioli

2016

Microelectronic Engineering

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Fluorescent latex beads have been widely used as tracers in microfluidics over for the last decades.They have the advantages to be density matched with water and to be easily localizable using fluorescence microscopy. We have recently synthesized silver-coated oil droplets that are both luminescent and absorptive. They have a mean diameter of 6 µm and a their density has been matched to the density of water by adjusting the thickness of the metallic layer. In this work we used these particles as tracers to measure the velocity profile of a water flow in a PDMS microchannel with a rectangular cross-section, which allowed us to confirm the predictions of the Stokes equation with results comparable to those of common submicronic polystyrene particles.2

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Section: Resultsmentioning

confidence: 99%

Luminescent and absorptive metal-coated emulsions for micro-velocimetry

Mesdjian

Chen

Fattaccioli

2016

Microelectronic Engineering

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“…and e is expected to reflect physical reality. For each of the three cases considered, we give as an example the dimensional current for a case where the surface on which the monticles lie is a disk inlaid on an insulating plane [21,32,42].…”

Section: Discussionmentioning

confidence: 99%

“…The current is obtained by substituting into [38] thef3-value for a disk-shaped monticle [39] and the ~-integral for a disk [A-3]. The dimensional form, using [5], is <i3> = 4nFc~Dol {1 -(4~ve/) -1 In (.el) + ...} [42] for ve 2 << 1 << .el. As in the section on Active Monticles, this result can be alternatively expressed in terms of the fractional coverage 4) and the ratio p of the monticle dimension to the assembly dimension.…”

Section: [35]mentioning

confidence: 99%

“…In this case the inner problem in the matched asymptotic expansion formulation of the third section of Appendix B is qu_asi-steady and yields the same effective boundary condition at leading order. Similarly, [36] is also appropriate for the calculation of the steady current in the presence of a shear flow (40)(41)(42)(43)(44) or a relative shear flow as in the rotating disk microelectrode (30). The requirement in this case, if S is a typical value of the shear rate at the surface, is that the parameter S/vDo is small.…”

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The Steady Current for Monticulate Microelectrodes and Assemblies of Ultramicroelectrodes

Phillips

1992

J. Electrochem. Soc.

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For a three-dimensional microelectrode or a planar microelectrode inlaid on an insulating plane, in order to model surface roughness or adsorption effects, we calculate the leading-order change in the steady, diffusion-limited current when "monticles" (i.e., small lumps or "pimples"), either active or insulating, are added to the microelectrode surface. As a model for an assembly of ultramicroelectrodes, or for adsorption affecting a large fraction of the surface area of a microelectrode, we also consider the steady diffusion-limited current for a random distribution of active monticles on an insulating surface of microscopic size and show that the average current is equal to that due to a reaction over the whole surface with a certain finite rate constant. In contrast to the time-dependent case, the extent of the interactions between monticles is shown to depend on the overall size of the surface as well as on the size and separation of the monticles. Similar results apply in all these cases for non diffusion-limited transport in the limit where a suitable dimensionless reaction rate constant becomes infinite.Over the last decade microelectrodes have been increasingly used in a variety of fields including physiology. Their small size and the associated short diffusion time scale and low double-layer capacitance result in high resolution of both spatial and temporal variation. Practical and theoretical aspects of microelectrode measurements have recently been reviewed by Wightman and Wipf (1). Most previous theory has treated microelectrodes with smooth, homogeneous surfaces; treatments of surface heterogeneity effects, following the experimental studies, have concentrated on time-dependent situations, generally using numerical-solution techniques. In this paper we consider the effects of surface heterogeneity, using asymptotic techniques to derive comparatively simple approximate solutions. To model surface roughness and adsorption effects, and the behavior of ultramicroelectrode assemblies, we calculate the steady current in three situations in which a surface is modified by the addition of small lumps or "pimples," which we call monticles. Either the surface is insulating and the monticles are active (ultramicroelectrode assembly or adsorption over a large area fraction), or the surface is active and the monticles are either active (roughness) or insulating (adsorption over a small area fraction).Consider the steady current for a microelectrode with a reaction O(soln) + he-~ R(soln)[1] at its surface. Denote the bulk concentrations of the two species by c~ and c~, their diffusion coefficients by Do and DR, and the forward and backward reaction rate constants by kf and kb, respectively. If I denotes a representative lengthscale of the microelectrode, we can define a dimensionless reaction rate constantsimilar to those used by other authors (2, 3). In a previous paper we have calculated the steady current for a microelectrode when K is large (4). Here we consider the case where K is infinite for all the active s...

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“…It aims to place the right person in the appropriate job by achieving compatibility between the requirements and duties of the job and the qualifications and characteristics of the person applying for this job [43]. The activities of selection and appointment are necessary because there are differences between individuals in terms of readiness, abilities, and tendencies, as well as differences among jobs in terms of mental or physical requirements [46], [51].…”

Section: Literature Review and Hypothesis Development A Human Resourc...mentioning

confidence: 99%

Impact of Human Resource Management Practices on Enhancing Employee Performance in Jordan Islamic Bank

2023

Journal of Southwest Jiaotong University

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The human element is the main resource in different organizations, especially in banks, because it is based on providing services to customers, which in turn depends on the performance of its employees. Human resource management (HRM) practices play an important role in raising the performance of employees. This paper aims to identify the practices of HRM (planning, polarization, selection and appointment, training, compensation) and their impact on enhancing the performance of employees in Jordan Islamic Bank. This study used a descriptive-analytical technique to describe the influence of HRM strategies on improving employee performance at Jordan Islamic Bank. This study relies on gathering facts, information, and data to describe, analyze, and evaluate them to draw conclusions. All administrative workers at Jordan Islamic Bank branches in Jordan, including managers and staff, were included in the research population. The study sample included 145 managers and staff from various administrative levels of Jordan Islamic Bank, who were chosen randomly from all of the bank's branches. The study concluded that there are a significant effect of HRM practices on enhancing the performance of employees in Jordan Islamic Bank and a significant correlation between HRM practices and enhancing employee performance. Also, the results showed a strong positive correlation between planning, polarization, selection and appointment, training, compensation, and enhancing employee performance.

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A guide to the identification of the more useful timbers of Nigeria, by Herbert Stone and H.A. Cox.

Cited by 3 publications

References 0 publications

Luminescent and absorptive metal-coated emulsions for micro-velocimetry

Luminescent and absorptive metal-coated emulsions for micro-velocimetry

The Steady Current for Monticulate Microelectrodes and Assemblies of Ultramicroelectrodes

Impact of Human Resource Management Practices on Enhancing Employee Performance in Jordan Islamic Bank

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