Rate Of Current Increase Research Articles

Computational Analysis on the Effects of Different Electrode Designs on the Electrochemical Performance of Lithium Ion Batteries

Li-ion batteries (LIBs) as an energy storage device have been established as a leading and a promising candidate for automotive and aerospace applications. But to meet the various application requirements, the energy and power density of LIBs need to be optimized for a given electrode material by controlling its porosity and thickness. Changes in electrode thickness and porosity affect the electrochemical performance of LIBs. Thus we employ a mathematical model to study and optimize the electrochemical performance of Graphite/ LiNi0.6Co0.2Mn0.2O2LIB cells with different cathode thicknesses and porosities. A non-linear least square method is used to provide a better understanding of the different porosities and thicknesses on Li-ion transport in both liquid and solid phases. Ragone plots are generated for the various cell designs where the specific energy and average specific power are evaluated. The LIB cells are optimized for discharge times ranging from 10 h to 2 min in order to map the maximum performance of this electrode chemistry under wide operating range. The study allows us to ascertain the ability of this chemistry to be used in a particular application. The solid phase Li-ion diffusion coefficient decreased with an increase in current rate. The salt concentration gradient increased with an increase in cathode thickness and porosity at high rate. Based on the experimental data and simulation results from this study, it can be concluded that both solution and solid phase diffusion limitation are the major limiting factors during high rate discharges in thick and less porous electrodes. The optimized designs derived in this work are expected to be starting point for battery manufacturers and to help decrease the time to commercialization.

Earth system commitments due to delayed mitigation

As long as global CO2 emissions continue to increase annually, long-term committed Earth system changes grow much faster than current observations. A novel metric linking this future growth to policy decisions today is the mitigation delay sensitivity (MDS), but MDS estimates for Earth system variables other than peak temperature (ΔTmax) are missing. Using an Earth System Model of Intermediate Complexity, we show that the current emission increase rate causes a ΔTmax increase roughly 3–7.5 times as fast as observed warming, and a millenial steric sea level rise (SSLR) 7–25 times as fast as observed SSLR, depending on the achievable rate of emission reductions after the peak of emissions. These ranges are only slightly affected by the uncertainty range in equilibrium climate sensitivity, which is included in the above values. The extent of ocean acidification at the end of the century is also strongly dependent on the starting time and rate of emission reductions. The preservable surface ocean area with sufficient aragonite supersaturation for coral reef growth is diminished globally at an MDS of roughly 25%–80% per decade. A near-complete loss of this area becomes unavoidable if mitigation is delayed for a few years to decades. Also with respect to aragonite, 12%–18% of the Southern Ocean surface become undersaturated per decade, if emission reductions are delayed beyond 2015–2040. We conclude that the consequences of delaying global emission reductions are much better captured if the MDS of relevant Earth system variables is communicated in addition to current trends and total projected future changes.

Changes in the geometry and volume of rabots glaciär, sweden, 2003–2011: recent accelerated volume loss linked to more negative summer balances

Terminus geometry, ice margins, and surface elevations on abots glaciär were measured using differential during summer 2011 and compared with those similarly measured in 2003. Glacier length over the eight years decreased by ∼105 m corresponding to 13 m a−1, a rate consistent with ice recession over the last several decades. Measured changes in surface elevations show that between 2003 and 2011 the glacier's volume decreased by ∼27.6 ± 2.6 × 106 m3, or 3.5 ± 0.3 × 106 m3 a−1. This compares favorably with an estimate of −28.1 ± 2.6 × 106 m3 based on a mass‐balance approach. The rate of volume loss appears, however, to have significantly increased after 2003, being substantially greater than rates determined for the intervals 1959–80, 1980–89, and 1989–2003. This increase corresponds to a sustained interval of more negative summer balances. Previous work suggests that as of 2003 abots glaciär had not yet completed its response to a ∼1°C warming that occurred c. 1900, and thus the current marked increase rate of ice loss might reflect the effect of recent, or accelerated regional warming that occurred during the last decade superimposed on its continued response to that earlier warming.

Interplay between the potential waveform and diffusion layer dynamics determines the time-response of voltammetric detection in microchannels

The diffusion layer is a critical factor affecting the temporal response of electrochemical devices. In this article, we have investigated the effect of the relaxation of the diffusion layer during the potentiodynamic sensing of ferrocenemethanol (FcMeOH) in microchannels and compared these results to amperometry. First, the effect of the relaxation of the diffusion layer is described, both theoretically and experimentally. Then, chronoamperometric and voltammetric measurements were considered, and the rate of current increase as a plug of FcMeOH is injected into the device was studied for both cases. It was found that, for the oxidation of FcMeOH, the waveform maximising the duration of the anodic phase provided an improved response for potentiodynamic methods, even though amperometry was always found to show the best results. This was further established by extracting the impulse response and modulation transfer functions, which characterize the time and frequency responses, respectively, of the fluidic/electrochemical system. These findings can help designing potential waveforms improving the time response of the device, in systems where high temporal resolution is needed. This is particularly appropriate to bioelectrochemical analyses, where release and uptake phenomena can occur on the millisecond timescale.

Preparation and characterization of chlorine doped Li3V2(PO4)3 as high rate cathode active material for lithium secondary batteries.

Monoclinic Li3V2(PO4)2.99Cl0.01 was synthesized using the conventional solid state method and the X-ray diffraction pattern was indexed based on P2(1)/n space group. The sharp cyclic voltammetric curves clearly revealed three lithium extraction/insertion processes at approximately 3.64, 3.72, 4.13, and 4.58 V during the anodic scan and 3.96, 3.58, and 3.48 V during the cathodic scan. Charge/discharge studies showed reduced electrolyte decomposition contribution in the case of the chlorine doped Li3V2(PO4)2.99Cl0.01 sample with an initial capacity of 176 mA h g(-1) at a 0.1 C current rate. The chlorine doped Li3V2(PO4)3 sample showed an increased capacity retention with an increase in current rate, even at a very high C-rate (20 C), than the pristine and carbon coated samples. The pristine and carbon coated Li3V2(PO4)3 samples showed a lower capacity retention of 71% and 84%, respectively, at a current rate of 0.1 C. In contrast, the chlorine doped Li3V,(PO4)3 sample retained 87% of the initial capacity (176 mA h g(-1)) at the same current rate but with a higher coulombic efficiency of 91%. The enhanced capacity retention for the chlorine doped Li3V2(PO4)3 was attributed to the reduction in polarization and decreased charge transfer resistance of the electrode.

Scientific narratives in autism spectrum disorder.

Autism spectrum disorder (ASD) has increased in prevalence in the United States from one in 10 000 in the 1950s to one in 88 today. And in South Korea, the prevalence is now one in 44.1 If the current rate of increase in the incidence of ASD continues, it could become the norm in children in 30 years. Scientific research continues to reveal potential connections between ASD and the gut microbiome or cancer gene mutations. It occurs in all socioeconomic and ethnic groups and is almost five times more common in boys than in girls. The costs to families and society is high—Medicaid costs for children with ASD are almost five times higher than for children without a diagnosis of ASD. And these costs do not begin to include those of intensive behavioral intervention.2 Why is the prevalence of this condition increasing, and can a systems-oriented approach be used to resolve this pressing health challenge?

Between Scylla and Charybdis: energy, carbon dioxide, and indoor environmental quality

Between Scylla and Charybdis: energy, carbon dioxide, and indoor environmental quality

WNK4 inhibition of ENaC is independent of Nedd4-2-mediated ENaC ubiquitination

A serine-threonine protein kinase, WNK4, reduces Na⁺ reabsorption and K⁺ secretion in the distal convoluted tubule by reducing trafficking of the thiazide-sensitive Na-Cl cotransporter to and enhancing renal outer medullary potassium channel retrieval from the apical membrane. Epithelial sodium channels (ENaC) in the distal nephron also play a role in regulating Na⁺ reabsorption and are also regulated by WNK4, but the mechanism is unclear. In A6 distal nephron cells, transepithelial current measurement and single channel recording show that WNK4 inhibits ENaC activity. Analysis of the number of channel per patch shows that WNK4 reduces channel number but has no effect on channel open probability. Western blots of apical and total ENaC provide additional evidence that WNK4 reduces apical as well as total ENaC expression. WNK4 enhances ENaC internalization independent of Nedd4-2-mediated ENaC ubiquitination. WNK4 also reduced the amount of ENaC available for recycling but has no effect on the rate of transepithelial current increase to forskolin. In contrast, Nedd4-2 not only reduced ENaC in the recycling pool but also decreased the rate of increase of current after forskolin. WNK4 associates with wild-type as well as Liddle's mutated ENaC, and WNK4 reduces both wild-type and mutated ENaC expressed in HEK293 cells.

Increasing influence of heat stress on French maize yields from the 1960s to the 2030s

Improved crop yield forecasts could enable more effective adaptation to climate variability and change. Here, we explore how to combine historical observations of crop yields and weather with climate model simulations to produce crop yield projections for decision relevant timescales. Firstly, the effects on historical crop yields of improved technology, precipitation and daily maximum temperatures are modelled empirically, accounting for a nonlinear technology trend and interactions between temperature and precipitation, and applied specifically for a case study of maize in France. The relative importance of precipitation variability for maize yields in France has decreased significantly since the 1960s, likely due to increased irrigation. In addition, heat stress is found to be as important for yield as precipitation since around 2000. A significant reduction in maize yield is found for each day with a maximum temperature above 32 °C, in broad agreement with previous estimates. The recent increase in such hot days has likely contributed to the observed yield stagnation. Furthermore, a general method for producing near-term crop yield projections, based on climate model simulations, is developed and utilized. We use projections of future daily maximum temperatures to assess the likely change in yields due to variations in climate. Importantly, we calibrate the climate model projections using observed data to ensure both reliable temperature mean and daily variability characteristics, and demonstrate that these methods work using retrospective predictions. We conclude that, to offset the projected increased daily maximum temperatures over France, improved technology will need to increase base level yields by 12% to be confident about maintaining current levels of yield for the period 2016–2035; the current rate of yield technology increase is not sufficient to meet this target.

Enhancing photosynthetic CO2 use efficiency in rice: approaches and challenges

It is estimated that 925 million people mainly in developing countries suffer from malnutrition due to food shortage. This situation will deteriorate as world population will reach 9 billion by 2050. It is obvious that current rate of increase in crop yields is not sufficient to solve the problem of food security worldwide, especially in Asia, where at least 50 % increase in rice yield is needed to satisfy the increasing population. Depending on advanced development of modern biotechnology, several strategies have been provided for ‘supercharging’ photosynthesis to increase rice yield. In this review, we updated four major approaches: namely improving the performance of ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco), establishment of photorespiratory bypass, installing single-cell and two-celled C4 photosynthesis. The first approach aimed at direct manipulation of Rubisco for more efficient catalytic character by directed molecular evolution. The second approach focused on reducing the loss of photorespiratory CO2 by direct manipulation of photorespiratory pathway. The last two concentrated on introduction of C4 pathway into rice, based on the observation that the efficiency of C4 photosynthesis is 50 % higher than that of C3 photosynthesis.

Piezoresistance behaviors of ultra-strained SiC nanowires

In situ electrical measurement experiments were carried out in individual SiC nanowires (NWs) subjected to tensile strain using a transmission electron microscope. Fracture strain approaching 10% was achieved for a diamond-structure SiC NW with a 〈111〉 direction. With an increase in the tensile strain, the conductance increased monotonously. The current rate of increase remained constant prior to fracture. The calculated piezoresistance coefficient of this SiC NW was −1.15 × 10−11 Pa−1, which is similar to the coefficient of the bulk material. Our results indicate that these SiC NWs can be used as pressure sensors even in very high-pressure environments.

Publication Growth in Biological Sub-Fields: Patterns, Predictability and Sustainability

Biologists are producing ever-increasing quantities of papers. The question arises of whether current rates of increase in scientific outputs are sustainable in the long term. I studied this issue using publication data from the Web of Science (1991–2010) for 18 biological sub-fields. In the majority of cases, an exponential regression explains more variation than a linear one in the number of papers published each year as a function of publication year. Exponential growth in publication numbers is clearly not sustainable. About 75% of the variation in publication growth among biological sub-fields over the two studied decades can be predicted by publication data from the first six years. Currently trendy fields such as structural biology, neuroscience and biomaterials cannot be expected to carry on growing at the current pace, because in a few decades they would produce more papers than the whole of biology combined. Synthetic and systems biology are problematic from the point of view of knowledge dissemination, because in these fields more than 80% of existing papers have been published over the last five years. The evidence presented here casts a shadow on how sustainable the recent increase in scientific publications can be in the long term.

Overheating of an optically triggered SiC thyristor during switch-on and turn-on spread

A simple adiabatic model of the switch-on and turn-on spread in an optically triggered SiC thyristor has been developed. The model makes it possible to evaluate the overheating of the structure with consideration for the switched current Imax, the rate of current increase dI/dt, the power/energy of the UV light source used for switching, the area initially switched-on by light, and the switch-on time constant τ of the thyristor. The applicability of the adiabatic approximation to evaluation of the device overheating is substantiated. It is shown that the instantaneous maximum power density is approximately inversely proportional to the area of the initially switched-on portion of the thyristor. The estimates obtained demonstrate that, to preclude the inadmissible overheating of the structure, the maximum current density during switch-on, jmax, should not exceed ∼(2–3) × 104 A cm−2. With jmax ≈ Imax/πr02 ≈ U0/πrr02Rl taken for estimation, it is possible to estimate the radius of the optical window r0 for a given voltage U0 at which the structure is switched on and a chosen load resistance Rl.

Menu engineering for assisted-living elderly: a public health imperative

Poor nutrition in older people is a growing public health concern. Menu engineering provides a way of improving the nutritional well-being of older people, however there is little published qualitative data examining how effective menu engineering actually is. Dr Meena Mahadevan from Montclair State University introduces new research which aims to close this scientific knowledge gap Background With a current annual increase rate of 2.8%, experts predict that the growth rates for the elderly population in the U.S. will continue to exceed the growth rates for the rest of the population.1 More than one million elderly in the nation currently reside in assisted- or independent-living facilities. While these individuals require a minimum level of assistance with activities of daily living, they exhibit greater cognitive capacity and functional independence compared to their nursing home counterparts. The high cost of nursing home care coupled with their desire to age at home have made this group one of the fast-growing segments of the elderly population in the past decade.2 With the continual rise in the number of older adults at such facilities, it is imperative that their health status is met and maintained in order to improve their quality of life. Nutritional well-being has been shown to play a vital role in the overall health, independence, and quality of life of all older adults.3 Tragically, studies show that most assisted-living elderly residents aren't eating well. Deficiencies of several key macro- and micronutrients have been documented while excessive intakes of fat, cholesterol, saturated fat, and sodium are also common in some, leading to an increase in chronic disease risk.4 Research suggests that there are many physiological, social, and environmental barriers that may deter this population from meeting and maintaining a good nutritional status. Medical conditions, medication side effects, and physiological changes that are an inevitable part of ageing can result in a reduced capacity to digest, absorb, and utilise nutrients. Physical incapacity and disabilities may serve as structural barriers that further diminish their ability to purchase, prepare, and consume balanced meals. Studies show that the elderly at assisted-living facilities are also unable to adopt healthy behaviours largely because of systemic barriers which include limited choice and poorly trained staffwho ignore their residents' nutritional needs.5 Nutritional risk among the elderly was found to be reduced when meal times are accompanied in the presence of others; but many assistedas well as independent-living elderly report feeling socially isolated and depressed.6 Inadequate nutrition knowledge, negative attitudes, selfdefeating beliefs that they are too old to benefit from eating healthily, rejection of food that does not elicit familiarity or comfort, and frustration over loss of control over daily food choices have all been identified as factors possibly contributing to a lack of motivation to eat appropriately among this group.7 Meal times Although significant progress has been made, the afore-mentioned barriers continue to complicate intervention effectiveness and stymie public health efforts to address the crises of poor nutrition in our senior citizens. It has been suggested that by simply adjusting menus and food preparation techniques to conform more closely to an individual's food preferences and needs, facilities can help improve their residents' food and nutrient intakes. Menu engineering research involving manipulations in the design, language, and layout of menus have shown promise in this regard. For example, boxing and placing an item in a prominent location, using descriptive language to provide more information on the ingredients and method of preparation used, and 'advertising' an item's health benefit by providing nutritional information have all been used as tools to influence the selection of certain items. …

Farmland conversion to non-agricultural uses in the US and Canada: current impacts and concerns for the future

Conversion of farmland to non-agricultural uses presents a challenge to future food production and ecosystem services in US and Canada. Expansions of housing, transportation, industry, retail sales, schools and other developments are driving land out of farming. In the US there is annual conversion of 500,000 ha away from food and fibre production systems. Coupled with 1% annual population increase, this will reduce today's 0.6 ha per person to 0.3 ha by 2050. Canada has more land and smaller population, but farmland losses are occurring in fertile areas near coasts and in level valleys where highest quality land is located. Current rates of increase in agricultural productivity will not compensate for this land loss. Compared to US, there are more specific tools and legislation at the provincial level in Canada that provide opportunities for controlling sprawl. Important in both countries is general lack of awareness and concern about loss of productive farmland, a situation that could be improved through education. Stimulating collective understanding of this growing problem and providing viable solutions could provide the basis for national policy strategies to promote and assure sustainable food systems for the future and enhance the capacity to maintain vital ecosystem services.

The computational modelling of the kinetics of ascorbic acid palmitate hydrolysis by lipase considering diffusion

Abstract This paper presents mathematical and computational modelling of kinetics of a bioelectroanalytical system based on the interfacial action of hydrolytic enzyme. A system of non-linear differential equations with diffusion is used to describe the kinetics of Termomyces lanuginosa lipase (TLL) catalyzed hydrolysis of L-ascorbic acid palmitate (AAP). The system was solved numerically, and the kinetic prameters of AAP hydrolysis by the enzyme were determined. The experimental and modelling results show linear dependence of the rate of AAP hydrolysis on the TLL concentration. Complex dependence of the initial rate of bioelectrocatalytic current increase on the thickness of total diffusion layer (hydrodynamic diffusion layer plus thickness of dialysis membrane on the electrode surface) is also demonstrated and explained.

No End in Sight: The Skin Cancer Epidemic Continues

The incidence of nonmelanoma skin cancer (NMSC) continues to increase. Multiple reports from the United States and Europe suggest we are in the midst of an epidemic. European studies show substantial NMSC incidence increases during the last 2 decades. In the United States, a recent analysis of Medicare Claims data showed that procedures performed for NMSC nearly doubled from 1994 to 2006. From these data, the total number of new NMSC in 2006 was estimated to be 3,507,693. Procedure data for 2006-2008 from the 5% Medicare Claims sample dataset corroborate the reported trajectory of incidence increase. Destructions, excisions, and Mohs procedures for NMSC have increased by 2.6% per year during the last 2 years. On the basis of this current rate of increase, the annual incidence of NMSC in the United States in 2008 would be nearly 3.69 million. Recognizing the NMSC epidemic is critical as the incidence-and cost-will continue to increase.

Food for Thought: A Review of the Role of Energy in Current and Evolving Agriculture

World malnutrition is a serious problem. Food security for the poor depends on an adequate supply of food and/or the ability to purchase food. The World Health Organization reports that more than 3.7 billion people worldwide are malnourished because of shortages of calories, protein, several vitamins, iron, and iodine. People can die because of shortages of any one or a combination of these nutrients. In the world today there are more than 6.8 billion humans. Based on current rates of increase, the world population is projected to double to more than 13 billion in about 58 years. At a time when the world population continues to expand at a rate of 1.2% per year, adding more than a quarter million people daily, providing adequate food becomes an increasingly difficult problem. The need to increase and make more rational food production, to conserve natural resources, and to reduce food (crop) losses to pests is critical. Also critical is a need to reduce human population numbers. Cropland, water and energy resources are inadquate to support the current 6.8 billion people on earth.

Barometer of Life: Sampling

![Figure][1] CREDIT: [ISTOCKPHOTO.COM][2] In their Policy Forum “The Barometer of Life” (9 April, p. [177][1]), S. N. Stuart and coauthors report that 160,000 species are required to approach a meaningful indicator of the health of species. Assuming a linear projection, at the current rate of increase and level of investment, this goal will take until 2040. For the barometer to provide trend information (change in status), the 160,000 species assessments will have to be repeated on a regular basis, increasing the time frame for delivery. It is hoped that increased investment and commitment will help accelerate this process, but this will inevitably take many years; the health of the planet's species needs urgently to be better understood. Conducting conservation assessments of a representative sample of a set of species ([ 1 ][3]) can produce robust, meaningful results in a shorter time frame [e.g., ([ 2 ][4])], setting a baseline from which future change can be measured and indentifying a suite of species whose fate can be tracked over time. By the end of 2010, this new approach will reveal the status of all vertebrates, a large group of plants, and a number of invertebrate groups ([ 3 ][5]). This technique has important advantages. (i) It enables rapid assessment of groups of species, even those that are comparatively poorly known. (ii) It will add groups of species to the barometer that are more important to ecosystem function (e.g., pollination, water filtration, carbon sequestration) than those that are currently assessed. By using the sampled approach and creating a barometer that is truly representative of biodiversity, we will better equip ourselves to make the right decisions about maintaining life on Earth. 1. [↵][6]1. J. E. M. Baillie 2. et al ., Conserv. Lett. 1, 18 (2008). [OpenUrl][7][CrossRef][8] 2. [↵][9]1. V. Clausnitzer 2. et al ., Biol. Conserv. 142, 1864 (2009). [OpenUrl][10][CrossRef][11][Web of Science][12] 3. [↵][13]1. J.-C. Vie, 2. C. Hilton-Taylor, 3. S. N. Stuart 1. B. Collen 2. et al ., in Wildlife in a Changing World: An Analysis of the 2008 IUCN Red List of Threatened Species, J.-C. Vie, C. Hilton-Taylor, S. N. Stuart , Eds. (IUCN, Gland, Switzerland, 2009), pp. 67–76. [1]: pending:yes [2]: http://ISTOCKPHOTO.COM [3]: #ref-1 [4]: #ref-2 [5]: #ref-3 [6]: #xref-ref-1-1 View reference 1 in text [7]: {openurl}?query=rft.jtitle%253DConserv.%2BLett.%26rft.volume%253D1%26rft.spage%253D18%26rft_id%253Dinfo%253Adoi%252F10.1111%252Fj.1755-263X.2008.00009.x%26rft.genre%253Darticle%26rft_val_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Ajournal%26ctx_ver%253DZ39.88-2004%26url_ver%253DZ39.88-2004%26url_ctx_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Actx [8]: /lookup/external-ref?access_num=10.1111/j.1755-263X.2008.00009.x&link_type=DOI [9]: #xref-ref-2-1 View reference 2 in text [10]: {openurl}?query=rft.jtitle%253DBiol.%2BConserv.%26rft.volume%253D142%26rft.spage%253D1864%26rft_id%253Dinfo%253Adoi%252F10.1016%252Fj.biocon.2009.03.028%26rft.genre%253Darticle%26rft_val_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Ajournal%26ctx_ver%253DZ39.88-2004%26url_ver%253DZ39.88-2004%26url_ctx_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Actx [11]: /lookup/external-ref?access_num=10.1016/j.biocon.2009.03.028&link_type=DOI [12]: /lookup/external-ref?access_num=000267409300034&link_type=ISI [13]: #xref-ref-3-1 View reference 3 in text

WE‐E‐204B‐04: TiO2 Nanotube Field Emitter as a New Cold Cathode for X‐Ray Generation

Introduction/Purpose: Titanium dioxide (TiO2) nanotubes (NTs) grown by anodization are proposed as a new candidate for a cold cathode X‐ray source. This kind of oxide nanotube can potentially be an excellent choice to overcome the major limitations that exist in relation to carbon nanotubes (CNT). Being an oxide, TiO2 is not affected by residual oxygen present in the tube in contrast to CNTs, which can severely degrade from exposure to oxygen. Second, since TiO2 nanotubes are grown on a titanium (Ti) sheet as the latter oxidizes, a good electrical contact between TiO2 nanotube film and conductive Ti substrate is guaranteed. On the other hand, poor electrical contact between CNT and deposited substrate causes heating effects. The goal of this work was to simulate the effect of the NT parameters on field TiO2 NT emission properties. Methods: The field emission from two sources was considered: 1) from the top of NTs, and 2) the bottom of the NTs which serve as a thin semiconductor layer. Numerical calculations were performed to study the dependence of field emission on NT parameters for each emission mechanism. The calculations were performed in Matlab. Results: It is shown that the current decreased significantly with an increase of NT diameter, while it increased with the height of NTs. The rate of current increase with diameter is stronger for smaller diameter NTs. Regarding field emission from the bottom of the TiO2 layer, this current is strongly dependent on the TiO2 layer thickness and decreases as the latter increases. This current linearly increases with an increase of TiO2 electron charge carrier concentration. Conclusions: Effect of TiO2 NT geometrical and physical parameters on field emission can be simulated and the results can be used as a guide for design purposes.