Site Boundary Research Articles

Interactions of waste disposal site leachate with the Merida karst aquifer, Mexico

Hydrogeochemical tools were applied to evaluate the effect caused by the presence of municipal waste leachate on the balance of a karstic aquifer. The system evaluated correspond to the aquifer underlying the area of the old municipal waste disposal site (MWDS) in the city of Merida, Mexico. A contaminant plume identified with chloride ion concentrations was detected. Groundwater samples were collected from boreholes located along a flow line, starting at the downstream boundary of the dump site. The parameters involved in the carbonate system were analyzed, obtaining a decline in calcium (Ca2+) and magnesium (Mg2+) concentrations for high pCO2 values. This behavior is explained by the presence of high bicarbonate (HCO3–) content, as a result of the waste decomposition reactions. The bicarbonate ions behaved as a buffer preventing pH reduction. In addition to this, the calcium and magnesium species indicate that the formation of complexes affected the mineral solubility where leachate has the greatest influence. The transport of minerals, in moles, between boreholes located along the groundwater flow line, was determined through inverse modeling. It is concluded that the leachate affects the carbonate balance, as determined by the transfer of minerals along the flow line; it was observed that mixed waters with a higher percentage of leachate tend to dissolve carbonate minerals. This is the analogous to findings reported in other leachate contaminated aquifers.

PERANCANGAN PASAR ANGSAU

Markets are social and infrastructure where businesses buy and sell goods, services, and labor. The existing condition of the site located on Jalan A. Yani, Angsau Village, Pelaihari District, Pelaihari City are as follows: Site Position : Hook/Corner, Site Area: 8,375 m2, Soil Type: Hard Soil, Topography: Flat, Site Orientation: West , Vegetation: Trees, Coconut Trees, Cassava Trees, Bamboo Trees, Weeds, Undergrowth, Weeds, and other plants, Drainage: Artificial, Electrical Networks: Overhead, Site Boundaries: - South: Gas Station - West: Road and Mosque - North: Rifle Company - East: Housing. The position of the site which is near the main road roundabout is a strategic position because it is on a street corner which makes its position open from several directions so that it is very precise and ideal as a business or business area.

Study on Power-level Measuring Method of Structure-Borne Noise of Viaduct Road

Noise is generated when vehicles running on the viaduct road cause the structure to vibrate. The authors studied a measuring method for the power levels of structure-borne noise of viaducts, generated when tyres of running vehicles excite the road surface. This paper reports on the findings of the study on the effects of diffracted noise and measuring positions on the measured power levels. On the effect of diffracted noise, as a result comparing the structure-born noise measured at a point on the boundary of the road bridge site with a value gained by subtracting the diffracted vehicle noise from the measured noise, it was confirmed that the effect of diffracted noise is sufficiently low. As for the influence of measuring positions, when comparing values measured at a position located 1.2 m above ground with those at 0 m, a difference of about 3 dB was found. Considering the fact direct waves and ground reflected waves synthesize, it was confirmed that the difference is valid. As this study shows, influences of diffracted waves and measuring positions are small, and based on these results, the practical measuring method is proposed.

Our Checkered Past

ABSTRACTDespite advocacy of landscape approaches in cultural resource management (CRM) and critiques of the site concept, CRM data collection methods in the western United States continue to focus on individual archaeological sites as units of observation, analysis, and management. The transect-recording unit (TRU) method strikes a balance between conventional site-based recording methods and site-less survey approaches by dividing survey space into a grid of uniformly sized cells for recording all cultural manifestations observed across a survey area. TRU survey generates site boundaries required by CRM regulations while retaining a fine-grained spatial framework for landscape-level research and management. This article discusses the technical requirements of the TRU system and its potential for improving landscape-level research and management. Advances in digital recording technologies and analysis techniques render the method efficient and effective in identifying cultural resource distributions and characteristics otherwise obscured by conventional approaches. The research and management potential of the TRU system is illustrated through identification and interpretation of precontact foot trails in New Mexico's Tularosa Basin. These trails are essentially invisible during pedestrian survey but are readily identifiable as linear patterns using aggregated landscape-scale TRU survey data from multiple survey projects, providing novel insight into precontact routes of movement and exchange.

METTL3 regulates breast cancer-associated alternative splicing switches

Alternative splicing (AS) enables differential inclusion of exons from a given transcript, thereby contributing to the transcriptome and proteome diversity. Aberrant AS patterns play major roles in the development of different pathologies, including breast cancer. N6-methyladenosine (m6A), the most abundant internal modification of eukaryotic mRNA, influences tumor progression and metastasis of breast cancer, and it has been recently linked to AS regulation. Here, we identify a specific AS signature associated with breast tumorigenesis in vitro. We characterize for the first time the role of METTL3 in modulating breast cancer-associated AS programs, expanding the role of the m6A-methyltransferase in tumorigenesis. Specifically, we find that both m6A deposition in splice site boundaries and in splicing and transcription factor transcripts, such as MYC, direct AS switches of specific breast cancer-associated transcripts. Finally, we show that five of the AS events validated in vitro are associated with a poor overall survival rate for patients with breast cancer, suggesting the use of these AS events as a novel potential prognostic biomarker.

Study on the ground attenuation of engine run-up and APU noise for developing the airport noise model in Japan

The correction for ground effect around airports is modeled based on the results of numerical analysis in order to make it possible to estimate the propagation of noise caused by ground operations in airports such as engine run-ups and APU to the vicinity of airports. The excess attenuation due to ground effects on sound caused by engine run-ups and APU is calculated using a PE method for typical jet aircraft and propeller aircraft, respectively. On the assumption that the ground around an airport consists of asphalt-paved surface and grass-covered surface in a certain ratio, the excess attenuation for the mixed impedance ground is calculated with the Fresnel-zone method using the results of PE calculation. The composition ratio of ground surface is assumed based on the composition ratio of asphalt-paved surface and grass-covered surface along the propagation path from the engine run-up spot to the airport site boundary of six major airports in Japan. In this paper, we introduce the excess attenuation calculated with the PE method and the correction model for ground effects on noise of engine run-ups and APU is discussed to implement it in the airport noise prediction model used in Japan.

Variation in the properties of chernozems in the Priob Plateau within the boundaries of the key site “Volodarka” (Altai Territory, Russia)

The aim of the study. To assess spatial heterogeneity of the chemical properties of the chernozems of the Near-Ob Plateau within the boundaries of the key site “Volodarka” and explain the reasons that determined the variation of the studied soil properties. Location and time of the study. Steppe zone of the northeastern part of the Near-Ob Plateau within the boundaries of the key site “Volodarka” (52°41-42' N and 83°38'E); the results of the long-term research (2007–2019) are discussed. Objects of the study. Chernozems that formed under the dry-steppe vegetation on loess deposits, as well as on different horizons of paleosols of Middle Pleistocene origin that reached surface. Methodology. Soil samples were collected to a depth of 40 cm in a continuous column at an increment of 2 to 10 cm, taking into account the visible boundaries of genetic horizons. To characterize soil chemical properties, the methods commonly used in Russian soil science studies were used. Specifically, soil organic carbon content was determined by dichromate digestion method. Results. The studied properties of chernozems, currently functioning in the same environmental conditions of the key area located on the territory of the Altai Territory, showed significant variation, as can be judged by comparing their means and coefficients of variation. The greatest fluctuations in all soil properties in all soil profiles were observed, as a rule, in the 10–20 or 20–40 cm layers, whereas in the 0–10 cm layer they changed less significantly. It was revealed that the degree of humification and humus reserves, as well as nitrogen reserves and the nitrogen enrichment of humic substances in the 0-40 cm layer, can be regarded as significant; they displayed the greatest variation in the 20–40 cm layer. Conclusions. The heterogeneity of the main properties of chernozems located in the same natural conditions of the Priob Plateau within the boundaries of the key site “Volodarka”, even within 0-40 cm layer, is most likely due to the currently present features of ancient pedogenesis. Those features do not correspond to the combination of modern soil formation conditions of the dry-steppe type: it is confirmed by the presence and extent of clearly visible Middle Pleistocene pedocomplexes in the coastal outcrops of the Ob River. Different horizons of those pedocomplexes reached the surface and had been overlayed by products of modern soil formation in layers of different thicknesses. The combination of heterogeneity of soil profiles in terms of properties, position in the coastal outcrop and their visual differentiation allowed us to conclude that the variation in the compositional characteristics and properties of the studied soils resulted from the history of the territory development, which determined the surfacing of the buried paleosols. The knowledge of the heterogeneity of soil profiles makes it possible to use the studied soil properties and characteristics of their composition for monitoring the state of modern soils, substantiating forecasts of their behavior under changing ecological conditions, as well as for identifying features of ancient pedogenesis in order to reconstruct the paleonatural environment.

Structural features of buildings from metal structures

The article is devoted to the issue of preserving the architectural heritage of the outstanding Russian engineer V.G. Shukhov. Three objects are considered: the Moscow Radio Tower on Shabolovka, the “Shukhov Prolet” of the Sheet Rolling Shop and the Water Tower, located in the city of Vyksa, Nizhny Novgorod Region. The main design parameters of these structures and the results of their technical examination, the emergency response measures taken to ensure the safety of the Radio Tower in Moscow, and recommendations for the restoration of all three structures with the transfer of the Sheet Rolling Shop and the Water Tower to the central part of Vyksa are presented. It is planned to reconstruct the historical appearance of the buildings, as well as to improve the surrounding area. It is supposed to restore the geometric shape of the section by laser deposition of powder metal, and only if it is impossible to restore the element, its replacement is provided. To preserve the historical appearance, the joints of steel structures will be bolted, imitating rivets. In the course of excavation, archaeological research is planned, since within the boundaries of the construction site (the city of Vyksa) there may be areas of preserved cultural strata of the cultural heritage site “Estate-industrial complex, XVIII-XIX centuries”.

Total mercury in small mammals from forest ecosystems (nearby Cherepovets, Vologda region)

The aim of the research is to determine the total mercury (THg) in small mammals in forest ecosystems at a distance of 3 – 8 km from the boundaries of the industrial site of PJSC Severstal near Cherepovets, Vologda region. THg in the pelage and organs of the Ural field mouse (Apodemus uralensis, Pallas, 1811) varies from less than 0.001 to 0.56 mg/kg of dry weight (DW), the average maximum THg value was in the spleen (0.18 ± 0.07 mg/kg) and minimum in the muscles (0.02 ± 0.01 mg/kg). The content of THg in the pelage and organs of the common shrew (Sorex araneus, Linnaeus, 1758) varies from 0 to 4.57 mg /kg DW, the average maximum value of THg was in pelage (0.76 ± 0.15 mg / kg) and the average minimum in the liver (0.11 ± 0.01 mg /kg). The estimated mean THg level in the common shrew in the wet years 2021-2022 is lower than in the dry years 2009 and 2010. The reason for this is not clear. The results indicate the need for further investigation of changes in the total mercury content in the terrestrial ecosystem.

Rails East to Ogden: Utah's Transcontinental Railroad Story

Rails East to Ogden: Utah's Transcontinental Railroad Story

Summary of the Soil Reinforcement Technical Committee Special Session (IGS TC-R)

This document provides a summary of the different topics presented at the Special Session organized by the International Geosynthetics Society (IGS) Technical Committee on Soil Reinforcement (TC-R). This Special Session brings together very interesting studies regarding soil reinforcement in the field of geosynthetics. Studies presented include topics both from theoretical and practical points of view of reinforcement geosynthetics including general products and applications, cases studies on road embankments under challenging site boundary conditions, research on deterministic and probabilistic design of reinforced fills over voids, numerical analysis of reinforced soil wall structures, encased granular column technique, and geosynthetic-reinforced bridge abutment behavior.

The Delineation and Ecological Connectivity of the Three Parallel Rivers Natural World Heritage Site.

Landscape connectivity refers to the degree of continuity between the spatially structured units of a landscape. Ecological connectivity can characterise the degree to which ecological functional areas are connected in terms of function and ecological processes. In this study, the landscape pattern index and ecosystem service values were used to evaluate the ecological functional resistance of each landscape type, taking the Three Parallel Rivers Natural World Heritage Site as an example and the habitat distribution and population size of the Yunnan snub-nosed monkey as a reference. The minimum cost distance model, combined with the barrier impact index (BEI) and ecological connectivity index (ECI), was used to determine the degree of barrier impact on the study area and the ecological connectivity of the core reserve of the heritage site in both 2000 and 2020. The resistances of the different land types and landscape heterogeneity to the ecological function of species migration between the core protected areas of the heritage site were, in descending order, those of the forest, shrubs and grass, water, unused land, cultivated land, and built-up land. In 2020, the study area had a large BEI, with areas such as built-up areas, major roads, the sides of large rivers, and arable land being significant contributors to the blockage of landscape connectivity. The overall landscape connectivity in the study area was generally low, with clear spatial differentiation and a three-column parallel distribution pattern influenced by the topography and landscape. With the adjustment of the core reserve boundaries of the heritage site, the proportion of areas with high connectivity (ECI = 4-5) increased from 11.31% in 2000 to 34.36% in 2020. This increased landscape connectivity was conducive to the migration and reproduction of large terrestrial animals, such as the Yunnan snub-nosed monkey, with increasing numbers of populations and individuals. This study provides theoretical and methodological insights into the delineation and conservation of natural heritage sites and landscape connectivity.

DETEKSI DINI (SCREENING) KANKER RONGGA MULUT DENGAN MENGGUNAKAN TOLUIDINE BLUE 1%

Oral cancer is the most feared impact of smoking compared to other impacts because it is considered the most threatening to a person's life. 80% of oral cancer patients are smokers. A smoker has a seven times greater chance of developing oral cancer than a non-smoker. The appearance of lesions in the oral cavity resulting from a smoking habit is leukoplakia, which is white spots or plaque on the oral mucosa that cannot be peeled off. Experts say that leukoplakia is a pre-malignant lesion in the mouth. The percentage of leukoplakia that turns malignant is 3-6%. Smokers have a six times greater risk of suffering from leukoplakia than non-smokers. According to Silverman's research, of all Leukoplakia cases, 95% of sufferers are smokers. Some literature states that the peak development of leukoplakia can occur after 4 years of tobacco use. One way to detect early malignancies in the oral cavity is to use toluidine blue. Toluidine blue is an important additional diagnostic method to help identify the biopsy site and lesion boundaries, thereby providing a correct diagnosis and early treatment. Toluidine Blue 1% can be used by health workers because it does not require special skills, can be used en masse, is cheap, can be done without requiring a special room, so it can be used during social service services at Community Health Centers and Postal Service Centers.

LiDAR analyses in the contiguous Mirador-Calakmul Karst Basin, Guatemala: an introduction to new perspectives on regional early Maya socioeconomic and political organization

AbstractLiDAR coverage of a large contiguous area within the Mirador-Calakmul Karst Basin (MCKB) of northern Guatemala has identified a concentration of Preclassic Maya sites (ca. 1000 b.c.–a.d. 150) connected by causeways, forming a web of implied social, political, and economic interactions. This article is an introduction to one of the largest, contiguous, regional LiDAR studies published to date in the Maya Lowlands. More than 775 ancient Maya settlements are identified within the MCKB, and 189 more in the surrounding karstic ridge, which we condensed into 417 ancient cities, towns, and villages of at least six preliminary tiers based on surface area, volumetrics, and architectural configurations. Many tiered sites date to the Middle and Late Preclassic periods, as determined by archaeological testing, and volumetrics of contemporaneously constructed and/or occupied architecture with similar morphological characteristics. Monumental architecture, consistent architectural formats, specific site boundaries, water management/collection facilities, and 177 km of elevated Preclassic causeways suggest labor investments that defy organizational capabilities of lesser polities and potentially portray the strategies of governance in the Preclassic period. Settlement distributions, architectural continuities, chronological contemporaneity, and volumetric considerations of sites provide evidence for early centralized administrative and socio-economic strategies within a defined geographical region.

Development of a numerical model for sector-average plume gamma dose and its validation with dose rate measurements at Kalpakkam NPP site, India

A Gaussian Plume based simple numerical model, named DIFFUSE is developed to simulate the long-term sector-average plume gamma dose due to radioactive plume released during normal operation of nuclear facilities. DIFFUSE calculates site specific joint frequency distributions of wind speed, wind direction and atmospheric stability using micrometeorological observations. It performs the finite sector-average dose integration for any stack height and gamma energy using Simpson's 1/3rd method with sufficient computational efficiency within the site boundary up to 2 km. Plume dose contribution to the main plume sector from nearest and next nearest side plume sectors is also calculated. DIFFUSE is validated with a 3-month long, starting from February 2021 to April 2021, dose rate observation data during operational releases from 100 m stack of Madras Atomic Power Station, Kalpakkam, India. Meteorological data from onsite 50 m tower and continuous dose rate observation from two sets of Autonomous Gamma Dose Logger (AGDL) detectors, namely n-AGDLs and r-AGDLs, placed in two different configurations along the geometric arcs of wind sectors around the stack are used. Simulated doses are compared with look-up table based dose estimates by Hukkoo et al. (1988). Linear spatial averaging of cumulative AGDL doses on a sector arc is used as measured sector-average dose for model validation. Simulations performed for both n-AGDL and r-AGDL configurations show DIFFUSE estimated doses are ∼37% lower and Hukkoo estimated doses are at least ∼50% lower than the measured doses. Statistical analysis of DIFFUSE simulated doses shows a statistical correlation of R2∼98.3%, slope of the fit ∼1.36 for n-AGDL setup and R2∼75.3%, slope of the fit ∼1.57 for r-AGDL setup. Overall, DIFFUSE produces conservative doses compared to look-up table based doses as required by regulatory bodies.

A Hierarchical Bayesian Similarity Measure for Geotechnical Site Retrieval

Geotechnical site retrieval refers to the quantitative identification and extraction of sites similar to a given target site from predocumented generic sites in a database. This is known as the “site recognition challenge.” Recently, the second and third authors of this paper proposed a Bayesian similarity measure between a target site and generic records in the database. However, the proposed method can only retrieve “similar database records” but not “similar database sites”; that is, records are not grouped according to their test locations within a site boundary. The purpose of the current paper was to propose a novel Bayesian similarity measure between the target site and a database site to extract similar sites from a database. This “site retrieval” approach is more “explainable” to a geotechnical engineer because an engineer has an opportunity to accept or reject the identified “similar” sites based on his or her experiences and judgment. The human engineer can engage an explainable algorithm in a decision loop in a more meaningful way. Based on the hierarchical Bayesian model (HBM) previously developed by the second and third authors, this study further proposed a Bayesian method of measuring similarity between the target site and database sites for the purpose of geotechnical site retrieval. This hierarchical Bayesian measure elegantly reduces to the classical Kullback–Leibler divergence for complete multivariate data. The HBM was used to simultaneously model intrasite and intersite variability and construct the site-specific multivariate distribution for the database sites. Site retrieval was performed by measuring the similarity between the target and database sites in the form of a multivariate likelihood. It is shown that the proposed hierarchical Bayesian method can yield a meaningful interpretation of intersite similarity and can successfully be used for site retrieval. The proposed approach can also quantify the statistical uncertainty due to sparse (limited) and incomplete (missing) data.

From Methodology to Method in Genre-Based Ethnographies

Genre has long been used by Writing Studies ethnographers as a theoretical orientation and analytical tool to bridge text and context. This article describes how genre-based ethnographies as methodology might get taken up at the level of method. Drawing on a genre-based ethnographic study as an example and guide, this article presents a process of data collection that builds ethnographic sites from genre by emergently identifying chains of data sources and collection techniques emanating from starting genres. Applying a genre orientation at the level of method centers inquiry on writing and mitigates the need to define site boundaries. By articulating how a genre orientation might shape ethnography at the level of method, this article encourages a stronger articulation between research methodologies and methods across the field of Writing Studies. Further, this article can be used as a guide for researchers conducting genre-based ethnographies.

Offshore Wind Farm Layout Optimization Considering the Power Collection System Cost

The paper proposes a method for optimizing the layout of offshore wind farms to increase their efficiency by reducing the effect of aerodynamic shading, minimizing electrical losses in cable lines of the system for receiving and transmitting electrical energy generated by wind turbines to the electrical grid of the power system. The task is reduced to determining several parameters that define the geometric dimensions and shape of the layout grid with pre-installed tur-bine locations. This approach, in contrast to the coordinate-wise search method, makes it possible to build symmetrical grid layouts of wind power plants, which in practice are more convenient in terms of maintenance and operation. Together with the optimization of the layout, the search for the optimal location of the offshore transformer substation and the synthesis of the scheme of cable joints between wind power plants has been carried out. To solve this problem, a heuristic algorithm was used to search for a minimum spanning tree with a restriction on the conductivity of connections, which made it possible to build realistic schemes and more adequately assess their technical and economic characteristics. As the results of testing the proposed methodology on the example of optimizing the layout of the Horns Rev 1 wind farm have shown, the use of this approach has reduced the cost of the electrical system by 10–12 %. This is 7–11 % higher than the result obtained by using the MST algorithm, which performs the construction of a circuit of cable joints of a simplified topology. The change in the size and shape of the boundaries of the wind farm site resulted in an increase in the estimated electricity generation by 2.3 % and a decrease in its cost by 4 %. When optimizing the layout of wind turbines within the fixed boundaries of the site, these indicators are improved by only 1 and 2 % as compared to the original scheme.

Regionalization of microstructure characteristics and mechanisms of slip transmission in oriented grains deposited by wire arc additive manufacturing

Regionalization of microstructure regulation and mechanical property adjustment during the thermal cycle of the deposition process plays a vital role in the grain morphology and orientation of aluminum alloy components manufactured using wire arc additive manufacturing (WAAM) technology. However, the microscopic mechanism of the mechanical property difference caused by uneven microstructure in different regions remains unclear for the WAAM 2319 alloy. The geometric properties of grains are described quantitatively in different regions for the WAAM 2319 alloy through EBSD data processing and analysis. The effect of grain orientation on grain boundary, including subgrain boundaries and the boundary of coincidence site lattice (CSL boundary), are explored with EBSD data. The grain boundary and dislocations are characterized by transmission electron microscopy (TEM). The distribution of geometrically necessary dislocation (GND) in the WAAM block at different regions is studied through EBSD analysis. The high Schmidt factor or Taylor factor (M) percentage was quantitatively calculated in different regions. Then the relationship between grain morphology and plastic deformation ability is established through these factors. The results indicate that the average grain size is small and located in the top and middle of the WAAM sample with a low critical Taylor factor (Mc). The Taylor factor in most grains easily exceeds Mc (Mc < M), which causes most dislocations to pass through grain boundaries quickly, and plastic deformation easily occurs in these regions. There are various CSL boundaries except Σ3 boundaries existing in the middle of the sample, which can maintain the high mobility of the grain boundaries. Therefore, more slip transmission in the middle of the WAAM sample can provide the driving force for grain boundary migration. Most grains with a high subgrain boundary density (above 2.5) and the geometrically necessary dislocation (GND) density (5 × 1014 m−2) can hinder the movement of dislocations and improve the strength of materials at the sidewall of the sample. The Schmidt factor of columnar crystals is generally low (below 0.25), and the sliding system does not start rapidly in columnar crystals, especially at the bottom of the WAAM sample.

Re-framing Built Environment Practice: Towards an Accessible City

As practising architects in Victoria, Australia, we have observed significant, systemic industry failure, impeding the development of accessible and inclusive cities. Contemporary built environment design practice and design values push ‘accessible design’ to the margins, often considered as an after-thought and only in terms of technical and regulatory compliance. Built environment practice needs to be challenged into deeper ways of thinking – ones that stimulate professional discourse and heighten industry awareness of both its control over built environment accessibility outcomes and, critically, its accountability in serving the public good.Cities invariably comprise neighbourhoods. To begin to understand built environment inaccessibility at the neighbourhood scale, the built environment mindset must change to properly engage with complex, socio-ecological, public-realm (public space) built environments. Design practice must improve its neighbourhood site analysis approach, going beyond private, contractual site boundaries and immediate physical surrounds, to understanding end-user experiences, neighbourhood journeys, and the broader scale of (in)accessibility. Industry attitudes, practice approaches and the way disability is positioned by industry must change to embrace processes that necessitate diverse actors working together across multiple disciplines and sectors with people with disability being core actors in decision-making.We believe that opportunities exist in building industry interest and capacity. Research-informed built environment practice embracing systems-thinking, human rights-based approaches, and transdisciplinarity can be effective for aggravating industry change and the way industry positions disability. This paper adopts an analytical, collaborative autoethnographic approach, examining case studies of neighbourhood-scale accessibility assessment, outputs from activities questioning why built environment practitioners believe inaccessibility exists, and self-reflection on 10 to 35+ years of working in architectural practice. Importantly, this paper argues that in working towards achieving universally accessible public spaces for all, built environment practitioners, and architects in particular, must accept accountability for the impact of their actions on people with disabilities’ lived experiences.&#x0D; &#x0D; Read the full article in accessible html-format here.