0

vergova mariya 1950— bulgarian track and field athlete

Raman spectroscopy and field electron emission properties of aligned silicon nanowire arrays

Raman spectroscopy and field electron emission properties of aligned silicon nanowire arrays

Vật lý

... frequency shifts and the more asymmetric and the broader the peak becomes This feature has been confirmed by experiments on nanocrystalline silicon [22] and porous silicon [23] and SiNWs fabricated ... completely (Fig 2a and b) Further structural characterization of the SiNWs was performed with TEM and HRTEM Fig shows a typical individual nanowire Fig SEM images of as-prepared and treated SiNWs ... acetone and ethanol for 20 each The cleaned silicon wafer was immersed in a mixture of 4.6 mol/L HF aqueous solution and 0.02 mol/L silver nitrate with equal volume Then, the autoclave was sealed and...
  • 5
  • 365
  • 1
synthesis, electrical measurement, and field emission properties of a-fe2o3 nanowires

synthesis, electrical measurement, and field emission properties of a-fe2o3 nanowires

Vật lý

... 10-6 torr The sweep voltage was 0–1100 V and the emission current was measured using Keithley 2410 Results and Discussion Figure 1a and b shows the top view and cross-section view of the Fe-coated ... a-Fe2O3 NWs, a-Fe2O3 film, and Fe film were present in stage I At this stage, for both samples I and II, short NWs (\100 nm) and long NWs ([500 nm) grew from the low and high degree defect regions ... resistance between the CAFM tip and the NW RNW and Rfilm are the resistances of the NW and the film, respectively The overall resistance (Roverall) is the sum of Rcontact, RNW, and Rfilm It can be expressed...
  • 8
  • 403
  • 0
ultra-sharp a-fe2o3 nanoflakes growth mechanism and field-emission

ultra-sharp a-fe2o3 nanoflakes growth mechanism and field-emission

Vật lý

... 245, 291, 408 and 499 cm−1 correspond to the α-Fe2 O3 phase [20], namely two A1g modes (225 and 499 cm−1 ) and three Eg modes (245, 291 and 408 cm−1 ) Those peaks locating at 552 and 671 cm−1 ... [110] and the growth plane may be (110) where the oxygen is rich and Fe is deficient [13] Driven by the O-rich and Fe-deficient, at low temperatures (260 – 300 ◦ C), the diffusion of Fe atoms and ... points of Fe and α-Fe2 O3 (1535 and 1350 ◦ C, respectively) [15], the growth of α-Fe2 O3 nanoflakes is inexplicable by the vapor phase mechanism such as the vapor–liquid–solid (VLS) and vapor–solid...
  • 5
  • 293
  • 0
Báo cáo hóa học:

Báo cáo hóa học: " On the Morphology, Structure and Field Emission Properties of Silver-Tetracyanoquinodimethane Nanostructures" pptx

Hóa học - Dầu khí

... temperature of 373, 393 and 413 K with 30-nm-thick Ag film, respectively, and other conditions are the same With the temperature increasing, the turn-on field is 2.0, 5.5 and 7.0 V/lm, respectively ... is high The slopes and intercedes of these plots in the high field region are the same, showing the effective emission area and the emission for the Ag-TCNQ nanowires constant and stable Nanoscale ... turn-on field And the main point for good field emission lies on the high conductivity and the regular array density Further work needs to be done to verify the difference between two phases and to improve...
  • 6
  • 403
  • 0
Báo cáo hóa học:

Báo cáo hóa học: " Research Article Track and Cut: Simultaneous Tracking and Segmentation of Multiple Objects with Graph Cuts" doc

Hóa học - Dầu khí

... Bar-Shalom and X Li, Estimation and Tracking: Principles, Techniques, and Software, Artech House, Boston, Mass, USA, 1993 [9] Y Bar-Shalom and X Li, Multisensor-Multitarget Tracking: Principles and ... labels and track- to-detection assignment labels This allows the system to track and segment the objects at time t, while establishing the correspondences between an object currently tracked and ... Conference on Computer Vision and Pattern Recognition (CVPR ’07), pp 1–8, Minneapolis, Minn, USA, June 2007 [3] A Bugeau and P P´ rez, Track and cut: simultaneous e tracking and segmentation of multiple...
  • 14
  • 215
  • 0
Báo cáo hóa học:

Báo cáo hóa học: " Effect of Substrate Morphology on Growth and Field Emission Properties of Carbon Nanotube Films" pptx

Hóa học - Dầu khí

... SWNTs is, however, a high-temperature process and sometimes requires additional postsynthesis processing for FE measurements On the other hand, controlled and low-temperature growth of CNT films is ... but Fe patterned (sample 2), (iii) mechanically polished having randomly distributed pits of different shape and size (sample 3), and (iv) electrochemically etched Si having uniformly distributed ... USA; diameter: 0.5 mm and purity 99.99%), followed by vacuum annealing at 350 °C for making proper electrical contacts Distance between the cathode and anode was kept as cm and the current density...
  • 8
  • 368
  • 0
Báo cáo hóa học:

Báo cáo hóa học: " Synthesis, Electrical Measurement, and Field Emission Properties of a-Fe2O3 Nanowires" potx

Hóa học - Dầu khí

... 10-6 torr The sweep voltage was 0–1100 V and the emission current was measured using Keithley 2410 Results and Discussion Figure 1a and b shows the top view and cross-section view of the Fe-coated ... a-Fe2O3 NWs, a-Fe2O3 film, and Fe film were present in stage I At this stage, for both samples I and II, short NWs (\100 nm) and long NWs ([500 nm) grew from the low and high degree defect regions ... resistance between the CAFM tip and the NW RNW and Rfilm are the resistances of the NW and the film, respectively The overall resistance (Roverall) is the sum of Rcontact, RNW, and Rfilm It can be expressed...
  • 8
  • 270
  • 0
ORCHARD, GARDEN, AND FIELD INSECTSINSECTS pot

ORCHARD, GARDEN, AND FIELD INSECTSINSECTS pot

Nông nghiệp

... a day; and that if the average number of eggs laid by each female is one hundred and eighty-five, one chickadee would thus destroy in one day five thousand five hundred and fifty eggs, and, in ... fruit, and causes it to drop before ripening The larva then enters the ground to a depth of several inches There it becomes a pupa, and later, as a mature beetle, emerges and winters in cracks and ... crops, gardens, flowers, and forests seems to be increasing each season Therefore farm boys and girls should learn to recognize these harmful insects and to know how they live and how they may be...
  • 16
  • 183
  • 0
Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp: "Nutrient status and field performance of tree seedlings planted in Mediterranean degraded areas" doc

Báo cáo khoa học

... Mg and N, and Mg and Ca were still positive, whereas correlations between K and N, and K and P were negative On limestone, needle N concentration was positively related to P concentration, and ... diameter on a randomly selected subset of 25 seedlings per site and species 2.4 Leaf and needle sampling and analysis In July 1997, we collected one-year-old needles and leaves from 10 randomly selected ... status and field performance based on early survival and growth Pinus halepensis and Quercus ilex are among the most widespread tree species in the Mediterranean Basin They tolerate basic soils, and...
  • 8
  • 460
  • 0
Báo cáo khoa học:

Báo cáo khoa học: "Effects of desiccation and freezing on vitality and field performance of broadleaved tree species" ppsx

Báo cáo khoa học

... freezing affected REL and survival The effects of desiccation and freezing on planting stock quality and field performance varied and depended upon the length of exposure and species A main result ... desiccation and rough-handling on the survival and early growth of ash, beech, birch and oak seedlings, Ann For Sci 56 (1999) 391–402 [23] Ritchie G.A., Assessing seedling quality, in: Duryea M.L., Landis ... dry weight, shoot and root dry weight 3.3 Relationships between pre-planting assessments and field performance Correlation analysis between pre-planting vitality measurements and post-planting...
  • 10
  • 203
  • 0
Báo cáo toán học:

Báo cáo toán học: "quality and field performance of Douglas fir seedlings under varying degrees of water stress" potx

Báo cáo khoa học

... values The field trials were installed in a randomised block with two and four blocks for water-stressed and well-watered regimes, respectively Each block contained 120 seedlings, with ten randomised ... potential and root moisture content and subsequent forest performance of Sitka spruce and Douglas fir transplants, Forestry 65 (1992) 463-472 [32] Stein W.I., Nursery practices, seedling sizes and field ... Water potential in Douglas fir and other conifer species was correlated with mortality [4, 33] It provided good estimates of first- and second-year field survival and height increment in Douglas...
  • 10
  • 257
  • 0
Báo cáo khoa học:

Báo cáo khoa học: "Effect of desiccation during cold storage on planting stock quality and field performance in forest species" doc

Báo cáo khoa học

... and root water content: two variables that were measured in all species and treatments and were most sensitive to desiccation in shoots and roots, respectively Some additional results on WL and ... between root water content and survival (curvilinear relationship) on the one hand and between root water content and height variation (linear relationship) on the other hand (figure 4) In red oak, ... Douglas fir [32] and in Sitka spruce [7] Several quality variables and RGP have been used to predict field performance of seedlings exposed to desiccation The relationship between RGP and field performance...
  • 11
  • 342
  • 0
Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp: "The effects of stock type and radicle pruning on blue oak morphology and field performance" docx

Báo cáo khoa học

... Research and Extension Center Finally, a special thanks to J Tecklin, a UC Staff Research Associate, who helped plant and maintain the seedlings and collected and entered most of the field data ... Oak woodlands are also very important aesthetically, since the tree-covered hillsides provide a distinctive character to the state’s landscape In the minds of many, oaks and oak woodlands are ... trimming the radicles of germinated acorns on seedling morphology and field performance MATERIALS AND METHODS Acorn collection and planting Acorns for this study were collected in early October...
  • 8
  • 339
  • 0
Báo cáo khoa học:

Báo cáo khoa học: "Growth-chamber trial on frost hardiness and field trial on flushing of sessile oak" pdf

Báo cáo khoa học

... 111-120 The author thanks E Burchard and C Dühring for technical assistance, H Venne and BR Stephan for valuable discussions and comments, and J D Deans and an unknown reviewer for their helpful ... hardiness of Acer pseudoplatanus and found little difference between seedlings and adult trees He described the frost resistance of different organs and tissues and concluded that frost hardiness ... France (F), from Austria (A), each from Belgium (B) and Denmark (DK) and provenance each from Great Britain (GB), Poland (PL), Hungary (H) and This study was conducted on 34 provenances of Q...
  • 7
  • 294
  • 0
Báo cáo khoa học:

Báo cáo khoa học: " Ecophysiology and field performance of black spruce (Picea mariana): a review" ppsx

Báo cáo khoa học

... growth and survival of natural or outplanted seedlings through their effects on water relations, gas exchange, mineral nutrition, soil and air temperature, and light quantity and quality (Brand and ... with field performance Sutton (1987), for example, found poor correlations between field performance and RGC indices based on new root numbers, and good correlations between field performance and ... boreal conifers and Blake, 1986; Blake and Sutton, 1988; Grossnickle, 1988) In the field, part of this sensitivity is due to the shallow and slow-growing root system (Grossnickle and Blake, 1986;...
  • 23
  • 240
  • 0
báo cáo khoa học:

báo cáo khoa học: "Association analysis of frost tolerance in rye using candidate genes and phenotypic data from controlled, semi-controlled, and field phenotyping platforms" potx

Báo cáo khoa học

... 2008 and two months in 2009, and the interaction of year and linear trend in time Three platform-specific random effects (vector gPLATFORM) were used: replication, a random intercept and a random ... associations in a) controlled, b) semi-controlled, and c) field platforms The left and right hand side bars in a), b) and c) represent alleles with negative and positive effects relative to the Lo152 ... between the controlled and semi-controlled platform with r = 0.56, followed by correlations between the controlled and field platform with r = 0.54, and the semi-controlled and field platform with...
  • 14
  • 415
  • 0
Optical limitng and field emission studies of carbon nanotubes

Optical limitng and field emission studies of carbon nanotubes

Tổng hợp

... properties: optical limiting and field emission Our aim is to modify the carbon nanotubes using physical and chemical means to modify their optical limiting and field emission characteristics ... cheap and robust field emitting materials One such material is the carbon nanotube 1.9.1 What is Field Emission? Field emission is the process whereby electrons are emitted under high field conditions ... plasmon band have been studied by Mie and Maxwell-Garnett theory (3, 4), which has predicted that the plasmon absorption peak red-shifts and the band broadens with increasing nanoparticle size, and...
  • 83
  • 244
  • 0
AN1292 sensorless field oriented control (FOC) for a permanent magnet synchronous motor (PMSM) using a PLL estimator and field weakening (FW)

AN1292 sensorless field oriented control (FOC) for a permanent magnet synchronous motor (PMSM) using a PLL estimator and field weakening (FW)

Cao đẳng - Đại học

... headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India The Company’s quality system processes and procedures ... constant of the motor (and the load coupled on the motor’s shaft) and the slope of the ramp-up or ramp-down limits on the speed reference, whichever is faster FIELD WEAKENING (FW) The field weakening ... userparms.h project file and are ready to run The measurement of parameters comprises the rotor’s resistance, RS, and inductance, LS, and the voltage constant, ΚΦ The stator resistance and induction can...
  • 20
  • 430
  • 0
Debris flow impact assessment along the AlRaith Road, Kingdom of Saudi Arabia, using remote sensing data and field investigations

Debris flow impact assessment along the AlRaith Road, Kingdom of Saudi Arabia, using remote sensing data and field investigations

Tổng hợp

... standard geological and geomorphic field techniques General field techniques were employed to identify and map different types of debris flows, as well as to determine different types of landslides ... (DEM m resolution) and high-resolution satellite images (figures and 6), and the results have been verified during the field investigations According to the field data collected and remote sensing ... (1999), and Rimbock and Strobl (2002) Few landslide hazard studies were carried out in the Kingdom of Saudi Arabia along the road and highway sections With the help of remote sensing and GIS...
  • 20
  • 539
  • 1

Xem thêm