Google scholar Searches[edit | edit source]

  • Sterilization of ABS
  • Cleaning of ABS
  • testing of FDM materials
  • Cleaning of 3D printed parts
  • Harness design
  • Universal clip on
  • Universal harness attachment
  • Clip on attachment
  • Harness clip
  • Harness attachment
  • Harness holder
  • Harness attachment holder
  • Clip holder
  • Hose holder
  • Harness accessories
  • Workers breathing zone
  • Personal Sampling pump
  • Active sampling
  • Personal sampler cyclone
  • Mechanical properties of additively manufactured abs
  • Failure analysis of additive manufactured abs

Books[edit | edit source]

NIOSH Manual of Analytical Methods[edit | edit source]

NIOSH Manual of Analytical Methods, 1994, Fourth Edition


"Clip the cyclone assembly to the worker's label and the personal sampling pump to the belt. Ensure that cyclone hangs vertically. Explain to the worker why the cyclone can't be inverted"

Aerosol Tecnology[edit | edit source]

Hinds, W.C., 1999. Aerosol Tecnology, Properties, Beahavior and measurements of airborne particles, Second. ed. John wiley & Sons Inc. ISBN 978-0-470-02725


Own Comments:

  • Basic information about airborne particles, icluding most common measuring principles

Aerosol Sampling[edit | edit source]

Vincent, James H. 2007. Aerosol sampling, Science, standards, instrumentation and Applications. John Wiley & Sons Inc.

Own Comments:

  • History and sampling equipment (also standards and about health guidelines)


Chemistry, Emission Control, Radioactive Pollution and Indoor Air Quality[edit | edit source]

Chemistry, Emission Control, Radioactive Pollution and Indoor Air Quality, Edited By Nicola Mazzeo 2011.


Own Comments:

  • Basic book about Air quality

Additive manufacturing technologies[edit | edit source]

Gibson, I., Rosen, D.W., Stucker, B., 2015. Additive manufacturing technologies, Rapid Prototyping to Direct Digital Manufacturing, Second. ed. Springer, New York. [5]

Own Comments:

  • Basic information about 3D printing

Open-Source Lab : How to Build Your Own Hardware and Reduce Research Costs[edit | edit source]

J.M. Pearce, "Open-Source Lab: How to Build Your Own Hardware and Reduce Research Costs", Elsevier, 2014 [6]

Open-Source Lab: How to Build Your Own Hardware and Reduce Scientific Research Costs details the development of the free and open-source hardware revolution. The combination of open-source 3D printing and microcontrollers running on free software enables scientists, engineers, and lab personnel in every discipline to develop powerful research tools at unprecedented low costs. After reading Open-Source Lab, you will be able to: Lower equipment costs by making your own hardware build open-source hardware for scientific research actively participate in a community in which scientific results are more easily replicated and cited numerous examples of technologies and the open-source user and developer communities that support them instructions on how to take advantage of digital design sharing explanations of Arduinos and RepRaps for scientific use. A detailed guide to open-source hardware licenses and basic principles of intellectual property.

Own Comments:

  • Open licensing and benefits of sharing.

The 3D Printing Handbook[edit | edit source]

Redwood, B., Schöffer, F., Garret, B., 2017. The 3D Printing Handbook. 3D Hubs. [7]

Own Comments:

  • Basic information and guidelines for technologies, design and applications of 3D printing

Articles[edit | edit source]

The Location of Personal Sampler Filter Heads[edit | edit source]

B. B. Chatterjee M.B, M. K. Williams D.M, Joan Walford A.I.S & E. King B.Sc (1968) The Location of Personal Sampler Filter Heads, American Industrial Hygiene Association Journal, 30:6, 643-645, DOI: 10.1080/00028896909343188



Fifteen pasters in an electric accumulator factory each wore two personal samplers simultaneously for two consecutive shifts. The filter heads were attached to the upper left chest, one about 5 inches below the other. During the second shift the locations of the two heads were interchanged. The mean concentration obtained with the filter heads in the upper position was 0.181 mg/m3, while that obtained in the lower position was 0.225 mg/m3. The difference was 22% of the overall mean, and statistically highly significant (p < 0.01). Differences between the six samplers used were not significant. It was concluded that the location of the filter head should be defined more precisely than has been suggested for other jobs, and that the findings will be of particular importance when deriving threshold limit values.

Own Comments:

  • Trying to find the whole article
  • 1968!





The vapours of trichloroethylene and/or 1,1,1-trichloroethane are trapped on silica gel contained in a robust sampling tube made from a galvanized iron pipe connector and Simplifix couplings. Air from the worker's breathing zone is sucked through the tube by a battery operated personal sampling pump, sampler and pump being held on a harness fitted to the worker. Adsorbed solvent is eluted with methanol and estimated by gas chromatography using Chromosorb 101 as stationary phase. Mean exposure over a shift can be determined and related to parallel physiological measurements.

Own Comments:

  • 1973
  • Personal sampling tube was devised and tested with exposure to Tris

Monitoring Real-time Aerosol Distribution in the Breathing Zone[edit | edit source]

CORINNE A. MARTINELLI, NAOMI H. HARLEY, MORTON LIPPMANN & BEVERLY S. COHEN (2010) Monitoring Real-time Aerosol Distribution in the Breathing Zone, American Industrial Hygiene Association Journal, 44:4, 280-285, DOI: 10.1080/15298668391404806



A prototype air sampling, data recording, and data retrieval system was developed for monitoring aerosol concentrations in a worker's breathing zone. Three continuous-reading, light-scattering aerosol monitors and a tape recorder were incorporated into a specially designed and fabricated backpack for detailed field monitoring of both temporal and spatial variability in aerosol concentrations within the breathing zone. The backpack was worn by workers in a beryllium refinery. The aerosol which passed through each monitor was collected on a back-up filter for later chemical analysis for Be and Cu. The aerosol concentrations were recorded on magnetic tape as a function of time. The recorded signals were subsequently transcribed onto a strip chart recorder, then evaluated using a microcomputer with graphics capability. Field measurements made of the aerosol concentration at the forehead, nose, and lapel of operators during the melting and casting of beryllium-copper alloy demonstrated that there is considerable variability in concentration at different locations within the breathing zone. They also showed that operations resulting in worker exposure can be identified, and the precise time and duration of exposure can be determined.

Own Comments:

  • Trying to find the whole article, The packback design could be really interesting!
  • 1983

The TEAM Study: Personal Exposures to Toxic Substances in Air, Drinking Water, and Breath of 400 Residents of New Jersey, North Carolina, and North Dakota[edit | edit source]



Received July 25, 1986 Abstract EPA's TEAM Study has measured exposures to 20 volatile organic compounds in personal air, outdoor air, drinking water, and breath of -400 residents of New Jersey, North Carolina, and North Dakota. All residents were selected by a probability sampling scheme to represent 128,000 inhabitants of Elizabeth and Bayonne, New Jersey, 131,000 residents of Greensboro, North Carolina, and 7000 residents of Devils Lake, North Dakota. Participants carried a personal monitor to collect two 12-hr air samples and gave a breath sample at the end of the day. Two consecutive 12-hr outdoor air samples were also collected on identical Tenax cartridges in the backyards of some of the participants. About 5000 samples were collected, of which 1500 were quality control samples. Ten compounds were often present in personal air and breath samples at all locations. Personal exposures were consistently higher than outdoor concentrations for these chemicals and were sometimes 10 times the outdoor concentrations. Indoor sources appeared to be responsible for much of the difference. Breath concentrations also often exceeded outdoor concentrations and correlated more strongly with personal exposures than with outdoor concentrations. Some activities (smoking, visiting dry cleaners or service stations) and occupations (chemical, paint, and plastics plants) were associated with significantly elevated exposures and breath levels for certain toxic chemicals. Homes with smokers had significantly increased benzene and styrene levels in indoor air. Residence near major point sources did not affect exposure. © 1987 Academic Press, Inc.

Own Comments:

  • 1979-1985 goal develop methods for individual total exposure
  • one part of studies
  • Personal monitor

Evaluation of the SKC Personal Respirable Dust Sampling Cyclone[edit | edit source]

Göran Lidén (1993) Evaluation of the SKC Personal Respirable Dust Sampling Cyclone, Applied Occupational and Environmental Hygiene, 8:3, 178-190, DOI: 10.1080/1047322X.1993.10389189



Three generations of the SKC cyclone have been evaluated. The cyclone was intended to emulate the British Safety in Mines Personal Equipment for Dust Sampling (SIMPEDS). The size-selection efficiency of the first cyclone generation was evaluated by measuring its penetration curve with a TSI APS 3300, and was found to have a pronounced tail for large particle sizes. For smaller particle sizes the size-selection efficiency was very similar to that of the SIMPEDS. The cyclone's size-selection caused it to considerably oversample large particles, relative to both the SIMPEDS and the British Medical Research Council definition of respirable dust, but for smaller particles it compared favorably with the SIMPEDS. The second cyclone generation sampled somewhat more than the first. The third generation samples more closely to the SIMPEDS cyclone. The coefficient of variation for the third cyclone generation was estimated to be 0.038 for a foundry aerosol. Possible merits of the first two SKC cyclone generations are discussed in light of the new respirable sampling convention about to be adopted by the Comité Européen de Normalisation, the International Standards Organisation, and the American Conference of Governmental Industrial Hygienists.

Own Comments:

  • We redesigned one of skc cyclone
  • Asked for the the whole article
  • 1993

Design and validation of a high-flow personal sampler for PM2.5[edit | edit source]

ADAMS, H.S., KENNY, L.C., NIEUWENHUIJSEN, M.J., COLVILE, R.N., GUSSMAN, R.A., 2001. Design and validation of a high-flow personal sampler for PM2.5. Journal Of Exposure Analysis And Environmental Epidemiology 11, 5.



Abstract: A high - flow personal sampler ( HFPS ) for airborne particulate matter has been developed and fully characterised, and validation tests have been carried out. The sampler is a low - cost gravimetric instrument designed to collect particulate matter with a 50% cut point at 2.5�m aerodynamic equivalent diameter(PM2.5) , where size selection is achieved by the use of porous polyurethane foam. Development of a porous foam selector was chosen over a cyclone or impactor due to the lightweight, low - cost, and compact design that could be achieved. The sampler flow rate of 16 l / min is achieved using a portable, flow -controlled pump; this flow rate is far higher than that of conventional personal samplers and the HFPS can therefore be used for personal sampling in the ambient environment over short sampling periods of much less than 24 h. The HFPS is currently being used in a study of particle exposure of urban transport users ( cyclists, car drivers, bus and Underground rail passengers ) where personal sampling over short time periods representing typical commuter journey times is required. The HFPS was fully characterised in chamber studies with a TSI aerodynamic particle sizer ( APS ) . The sampler was then validated against a co - located U.S. EPA Federal Reference PM2.5 Well Impactor Ninety Six ( WINS ) and a KTL cyclone, and parallel testing was performed. Initial testing showed some penetration of particles through the porous foam structure; applying an oil coating to the foam eliminated this problem. Chamber testing was carried out on a number of different selector prototypes, with the final design giving a 50% penetration diameter ( i.e.,d 50)of2.4�m at 16 l/ min. The new sampler exhibited good agreement in three sets of co - located tests with established samplers, and parallel testing showed excellent agreement between paired HFPS samplers.

Own Comments:

  • New Personal sampler designed to be attached to commuters (cyclist etc.)

Anisotropic material properties of fused deposition modeling ABS[edit | edit source]

Sung‐Hoon Ahn, Michael Montero, Dan Odell, Shad Roundy, Paul K. Wright, "Anisotropic material properties of fused deposition modeling ABS",Rapid Prototyping Journal, Vol(8), Issue 4, 248-257, 2002. [14]

Abstract Rapid Prototyping (RP) technologies provide the ability to fabricate initial prototypes from various model materials. Stratasys Fused Deposition Modeling (FDM) is a typical RP process that can fabricate prototypes out of ABS plastic. To predict the mechanical behavior of FDM parts, it is critical to understand the material properties of the raw FDM process material, and the effect that FDM build parameters have on anisotropic material properties. This paper characterizes the properties of ABS parts fabricated by the FDM 1650. Using a Design of Experiment (DOE) approach, the process parameters of FDM, such as raster orientation, air gap, bead width, color, and model temperature were examined. Tensile strengths and compressive strengths of directionally fabricated specimens were measured and compared with injection molded FDM ABS P400 material. For the FDM parts made with a 0.003 inch overlap between roads, the typical tensile strength ranged between 65 and 72 percent of the strength of injection molded ABS P400. The compressive strength ranged from 80 to 90 percent of the injection molded FDM ABS. Several build rules for designing FDM parts were formulated based on experimental results.

Own Comments:

  • Parts made by FDM have ansiotropic properties
  • Air gap and raster orientation affect TS greatest while bead width, model temp. and color have little effect
    • Negative air gap: increase in strength and stiffness
    • Load should be carried along axial fibres.
  • Compressive str. higher than TS
    • Not affected much by build orientation
  • TS: 65-72% of IM ABS - ASTM D3039 (ASTM, 1976) (Horizontal orientation: axial greatest)
  • CS: 80-90% of IM ABS - ASTM D3039 (ASTM, 1976) (Horizontal orientation: greater)

Exposure to airborne allergens: a review of sampling methods[edit | edit source]

Anne Renström

Received 18th March 2002 , Accepted 14th June 2002 First published on 7th August 2002 [15]


A number of methods are used to assess exposure to high-molecular weight allergens. In the occupational setting, airborne dust is often collected on filters using pumps, the filters are eluted and allergen content in the eluate analysed using immunoassays. Collecting inhalable dust using person-carried pumps may be considered the gold standard. Other allergen sampling methods are available. Recently, a method that collects nasally inhaled dust on adhesive surfaces within nasal samplers has been developed. Allergen content can be analysed in eluates using sensitive enzyme immunoassays, or allergen-bearing particles can be immunostained using antibodies, and studied under the microscope. Settling airborne dust can be collected in petri dishes, a cheap and simple method that has been utilised in large-scale exposure studies. Collection of reservoir dust from surfaces using vacuum cleaners with a dust collector is commonly used to measure pet or mite allergens in homes. The sampling methods differ in properties and relevance to personal allergen exposure. Since methods for all steps from sampling to analysis differ between laboratories, determining occupational exposure limits for protein allergens is today unfeasible. A general standardisation of methods is needed.

Own Comments:

  • "A summary of some positive and negative features regarding sampling of aeroallergens using person-carried pumps is shown in Table 1."

Personal Exposure to Ultrafine Particles in the Workplace: Exploring Sampling Techniques and Strategies[edit | edit source]

BROUWER, D.H., GIJSBERS, J.H.J., LURVINK, M.W.M., 2004. Personal Exposure to Ultrafine Particles in the Workplace: Exploring Sampling Techniques and Strategies. The Annals of Occupational Hygiene 48, 439–453.



Recently, toxicological and epidemiological studies on health effects related to particle exposure suggest that 'ultrafine particles' (particles with an aerodynamic diameter of <100 nm) may cause severe health effects after inhalation. Although the toxicological mechanisms for these effects have not yet been explained, it is apparent that measuring exposures against mass alone is not sufficient. It is also necessary to consider exposures against surface area and number concentration. From earlier research it was hypothesized that results on number concentration and particle distributions may vary with distance to the source, limiting the reliability of estimates of personal exposure from results which were obtained using static measurement equipment. Therefore, a workplace study was conducted to explore the performance of measurement methods in a multi-source emission scenario as part of a sampling strategy to estimate personal exposure. In addition, a laboratory study was conducted to determine possible influences of both distance to source and time course on particle number concentration and particle size distribution. In both studies different measurement equipment and techniques were used to characterize (total) particle number concentration. These included a condensation particle counter (CPC), a scanning mobility particle sizer (SMPS) and an electrical low pressure impactor (ELPI). For the present studies CPC devices seemed to perform well for the identification of particle emission sources. The range of ultrafine particle number concentration can be detected by both SMPS and ELPI. An important advantage of the ELPI is that aerosols with ultrafine sizes can be collected for further analysis. Specific surface area of the aerosols can be estimated using gas adsorption analysis; however, with this technique ultrafine particles cannot be distinguished from particles with non-ultrafine sizes. Consequently, estimates based on samples collected from the breathing zone and scanning electron microscopic analysis may give a more reliable estimate of the specific surface area of the ultrafine particles responsible for personal exposure. The results of both the experimental and the workplace study suggest both spatial and temporal variation in total number concentration and aerosol size distribution. Therefore, the results obtained from static measurements and grab sampling should be interpreted with care as estimates of personal exposure. For evaluation of workplace exposure to ultrafine particles it is recommended that all relevant characteristics of such exposure are measured as part of a well-designed sampling strategy.

Own Comments:

  • "It is important that the sampling of aerosols should be either (ultrafine) size-selective, e.g. ELPI samples, or from the breathing zone, e.g. personal air samples."

Advances in passive sampling in environmental studies[edit | edit source]

Kot-Wasik, A., Zabiegała, B., Urbanowicz, M., Dominiak, E., Wasik, A., Namieśnik, J., 2007. Advances in passive sampling in environmental studies. Analytica Chimica Acta 602, 141–163.



Passive sampling is based on the phenomenon of mass transport due to the difference between chemical potentials of analytes in a given environmental compartment and the collection medium inside a dosimeter. The subsequent laboratory procedure (i.e. extraction, identification and determination of analytes) is the same as in the case of classic sampling techniques.

Passive sampling techniques are characterized by simplicity with regard to the dosimeter's construction as well as its maintenance. Therefore, they find ever increasing application in the field of environmental research and analytics. When choosing a passive sampling method, one should not forget that some passive samplers require the time-consuming calibration step before being used in the field.

Novel solutions and modifications of existing sampler designs have been presented. Practical application of passive dosimetry in environmental analytics, including sampling of water, soil, air and other atypical media are discussed. Some aspects of calibration methods in passive dosimetry are also described. The latest trends in the application of passive sampling are highlighted.

Own Comments:

  • state of the art of passive sampling
  • Passive sampling don't need pump, usually attached to the clothing

Field Evaluation of a Personal, Bioaerosol Cyclone Sampler[edit | edit source]

Janet Macher, Bean Chen & Carol Rao (2008) Field Evaluation of a Personal, Bioaerosol Cyclone Sampler, Journal of Occupational and Environmental Hygiene, 5:11, 724-734, DOI: 10.1080/15459620802400159



A personal cyclone sampler (cyclone) was operated continuously alongside a 25-mm filter sampler (filter), a slit impactor (Burkard slide), and a high-volume cyclone sampler (Burkard cyclone) at an outdoor location with abundant naturally occurring fungi (N = 30; sampling time: 12.5 ± 2.3 hr). Air concentrations (spore m-3) of 28 fungal groups were determined for all samplers by microscopy. Cyclone performance was judged using various indices to determine if it agreed with the other samplers in determination of the frequencies with which the fungal groups were observed, as well as their proportions of the total air concentration. Fungal diversity estimates were similar for all samplers and in the range of what has been reported nationally, i.e., observation of 9–11 equal groups per sample, but spore concentration dominated by 2–3 groups. Plots of paired cyclone:comparison sampler ratios against average concentrations identified biases. For example, ratios were correlated with concentration and there was greater uncertainty at lower concentrations. Mean ratios for cyclone:filter comparisons were not significantly different from one for ascospores, Aspergillus-Penicillium spp., basidiospores, Cladosporium spp., or total spore m-3. However, agreement was less consistent with the Burkard slide (0.74, 1.12, 0.91, 1.09, and 0.92, respectively) and the Burkard cyclone (2.31, 1.62, 1.43, 1.91, and 1.33, respectively). Concentrations of cell equivalent m-3 also were determined for the filter and two cyclone samples by polymerase chain reaction. Cell equivalents for Aspergillus fumigatus and Penicillium brevicompactum were compared with Aspergillus-Penicillium spp. spores, and Cladosporium cladosporioides and Cladosporium herbarum cell equivalents were compared with Cladosporium spp. spores. Cell equivalent:spore ratios below one for A. fumigatus and P. brevicompactum indicated that these species comprised smaller factions of total spores or were collected less efficiently than the larger C. cladosporioides and C. herbarum spores. The personal cyclone was shown to be suitable for collection of ambient airborne fungal spores and for analysis by microscopy and polymerase chain reaction. Keywords: cyclone sampler, fungal biodiversity, method comparison, outdoor air, sampler performance

Own Comments:

  • Personal sampling of fungi

Novel Active Personal Nanoparticle Sampler for the Exposure Assessment of Nanoparticles in Workplaces[edit | edit source]

Tsai, C.-J., Liu, C.-N., Hung, S.-M., Chen, S.-C., Uang, S.-N., Cheng, Y.-S., Zhou, Y., 2012. Novel Active Personal Nanoparticle Sampler for the Exposure Assessment of Nanoparticles in Workplaces. Environ. Sci. Technol. 46, 4546–4552.



A novel active personal nanoparticle sampler (PENS), which enables the collection of both respirable particulate mass (RPM) and nanoparticles (NPs) simultaneously, was developed to meet the critical demand for personal sampling of engineered nanomaterials (ENMs) in workplaces. The PENS consists of a respirable cyclone and a micro-orifice impactor with the cutoff aerodynamic diameter (dpa50) of 4 μm and 100 nm, respectively. The micro-orifice impactor has a fixed micro-orifice plate (137 nozzles of 55 μm in the inner diameter) and a rotating, silicone oil-coated Teflon filter substrate at 1 rpm to achieve a uniform particle deposition and avoid solid particle bounce. A final filter is used after the impactor to collect the NPs. Calibration results show that the dpa50 of the respirable cyclone and the micro-orifice impactor are 3.92 ± 0.22 μm and 101.4 ± 0.1 nm, respectively. The dpa50 at the loaded micro-Al2O3 mass of 0.36–3.18 mg is shifted to 102.9–101.2 nm, respectively, while it is shifted to 98.9–97.8 nm at the loaded nano-TiO2 mass of 0.92–1.78 mg, respectively. That is, the shift of dpa50 due to solid particle loading is small if the PENS is not overloaded.

Both NPs and RPM concentrations were found to agree well with those of the IOSH respirable cyclone and MOUDI. By using the present PENS, the collected samples can be further analyzed for chemical species concentrations besides gravimetric analysis to determine the actual exposure concentrations of ENMs in both RPM and NPs fractions in workplaces, which are often influenced by the background or incident pollution sources.

Own Comments:

  • This could be the new kind of personal sampler which could need clip-on


Mireya Pereza, Michael Block, David Espalina, Rob Winker, Terry Hoppe,Francisco Medina, Ryan Wicker

The University of Texas at El Paso, Stratasys Inc.



Fused Deposition Modeling (FDM) can be used to produce an array of medical devices; however, for such devices to be practical, they must be manufactured using sterilizable materials. Nine FDM materials were tested using four methods of sterilization: autoclave, ethylene oxide, hydrogen peroxide, and gamma radiation. Sterility testing was performed by incubating the samples in Tryptic Soy Broth for 14 days. The majority of the materials were sterilizable by all four methods while deformations were caused by autoclaving. Results from this research will allow medical staff to sterilize an FDM-manufactured device using a suitable method.

Own Comments:

  • ABSi, ABS-M30, ABS-M30i, ABS-ESD7, PCABS, PC, PC-ISO, PPSF, and Ultem 9085
  • Five test samples and one control were used for each method of sterilization
  • All but one control samples showed contamination-> unclean manufacturing process
  • Sterilization works, but not all samples could handle it without deforming (Don't but ABS to the autoclave)

Experimental characterization and analytical modelling of the mechanical behaviour of fused deposition processed parts made of ABS-M30[edit | edit source]

Dario Croccolo, Massimiliano De Agostinis, Giorgio Olmi, "Experimental characterization and analytical modelling of the mechanical behaviour of fused deposition processed parts made of ABS-M30", Computational Materials Science, Vol(79): Advanced Manufacturing, 506-518, 2013. [21]

Abstract The Fused Deposition Modelling process is a highly efficient Rapid Prototyping approach that makes it possible to rapidly generate even much complicated parts. Unfortunately, the Fused Deposition Modelling is affected by several parameters, whose setting may have a strong impact on the components strength. This paper is devoted to the study of the effects generated by the Fused Deposition Modelling production parameters on the tensile strength and on the stiffness of the generated components, tackling the question from both the experimental and the numerical points of view. For this purpose, an analytical model was developed, which is able to predict the strength and the stiffness properties, based on the number of contours deposited around the component edge and on the setting of the other main parameters of the deposition process. The fundamental result of the paper consists in the possibility of predicting the mechanical behaviour of the Fused Deposition modelled parts, once the raster pattern (dimensions, number of contours, raster angle) has been stated. The effectiveness of the theoretical model has been verified by comparison to a significant number of experimental results, with mean errors of about 4%.

Own Comments:

  • ASTM D638-10 standard was used however stress concenteration at fillet areas led to premature failure
    • New predictive version of ASTM D638-10 with a radius of 244mm was used instead
  • Exp. VS Analy. models fo determining TS and E.
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