scholarly journals Assessment of Costs in Harvesting Systems Using WoodChainManager Web-based Tool

2019 ◽  
Vol 41 (1) ◽  
pp. 49-57 ◽  
Author(s):  
Matevž Triplat ◽  
Nike Krajnc
Keyword(s):  
Forest Products ◽  
Economic Loss ◽  
Forest Harvesting ◽  
Web Based ◽  
Material Costs ◽  
Wide Range ◽  
The Matrix ◽  
Harvesting Systems ◽  
Cost Calculations ◽  
The Impact

The rationalization of working procedures during difficult market conditions is gaining increasing importance. For rational production, it is necessary to always be aware of what and how much to invest in the business process to obtain the desired products or services without economic loss. This article presents a tool for the assessment of costs in forest wood supply chains. WoodChainManager is a Web-based tool composed of three user modules intended for the assessment of material costs of individual machines or the total costs of all selected machines in a forest harvesting system. Users can test the impact of individual technologies on the total material costs of the harvesting system and thus optimize operation processes. The basic tool for describing harvesting systems is the matrix, which visualizes cutting and hauling from the standing tree in the stand to the forest products at the end user. The tool has built-in algorithms that prevent the selection of an illogical harvesting system. The selected method for calculating costs for individual machines is simple, but still reflects the state of the actually incurred costs. WoodChainManager offers cost calculations for a wide range of technologies, machines and appurtenant attachments. The authors of this paper wish to increase awareness and understanding of cost calculations and to offer the possibility to directly compare different harvesting systems.

scholarly journals Unravelling the impact of harvesting pressure on canopy-forming macroalgae

2016 ◽  
Vol 67 (1) ◽  
pp. 153 ◽  
Author(s):  
Doriane Stagnol ◽  
Renaud Michel ◽  
Dominique Davoult
Keyword(s):  
Habitat Characteristics ◽  
Spatiotemporal Variability ◽  
Macrobenthic Assemblages ◽  
Wide Range ◽  
The Matrix ◽  
Commercial Species ◽  
Canopy Removal ◽  
The Impact ◽  
Relevant Finding

Canopy-forming macroalgae create a specific surrounding habitat (the matrix) with their own ecological properties. Previous studies have shown a wide range of responses to canopy removal. Magnitude and strength of the effects of harvesting are thought to be context-dependent, with the macroalgal matrix that can either soften or exacerbate the impact of harvesting. We experimentally examined in situ the effect of harvesting on targeted commercial species, and how these potential impacts might vary in relation to its associated matrix. We found that patterns of recovery following the harvesting disturbance were variable and matrix specific, suggesting that local factors and surrounding habitat characteristics mediated the influence of harvesting. The greatest and longest effects of harvesting were observed for the targeted species that created a dominant and monospecific canopy on their site prior to the disturbance. Another relevant finding was the important natural spatiotemporal variability of macrobenthic assemblages associated with canopy-forming species, which raises concern about the ability to discriminate the natural variability from the disturbance impact. Finally, our results support the need to implement ecosystem-based management, assessing both the habitat conditions and ecological roles of targeted commercial species, in order to insure the sustainability of the resource.

Publicly Available Computers

Cyber Crime ◽  
2013 ◽  
pp. 1220-1244
Author(s):  
A.D. Rensel ◽  
J.M Abbas ◽  
H.R. Rao
Keyword(s):  
Full Range ◽  
Internet Access ◽  
The Internet ◽  
User Characteristics ◽  
Web Based ◽  
Access Barrier ◽  
Wide Range ◽  
Use Of The Internet ◽  
The Impact ◽  
Public Environment

Businesses and governments continue to expand the use of the internet to access and provide a wide range services to consumers. This change in service delivery presents a potential access barrier for people who do not have access to the internet available in their homes. Publicly available computers attempt to bridge this gap; however, it is not clear if people are willing to use computers in these environments to engage in the full range of web-based activities, particularly online transactions. We expand Triandis’ modified TRA model to consider user characteristics and the impact of the physical and virtual environment on public transactional use of websites. Results indicate that people are sensitive to the physical environment surrounding the computer and that Internet self-efficacy supports public transactional use while individual need for privacy deters transactional use in a public environment. In addition, people without personal internet access do complete transactions at other non-public locations and that completing transactions from non-public locations is a strong determinant of public transactional use.

Publicly Available Computers

2010 ◽  
Vol 8 (1) ◽  
pp. 1-25 ◽  
Author(s):  
Ann D. Rensel ◽  
June M. Abbas ◽  
H.R. Rao
Keyword(s):  
Physical Environment ◽  
Full Range ◽  
The Internet ◽  
User Characteristics ◽  
Web Based ◽  
Access Barrier ◽  
Wide Range ◽  
Use Of The Internet ◽  
The Impact ◽  
Public Environment

Businesses and governments continue to expand the use of the internet to access and provide a wide range services to consumers. This change in service delivery presents a potential access barrier for people who do not have access to the internet available in their homes. Publicly available computers attempt to bridge this gap; however, it is not clear if people are willing to use computers in these environments to engage in the full range of web-based activities, particularly online transactions. We expand Triandis’ modified TRA model to consider user characteristics and the impact of the physical and virtual environment on public transactional use of websites. Results indicate that people are sensitive to the physical environment surrounding the computer and that Internet self-efficacy supports public transactional use while individual need for privacy deters transactional use in a public environment. In addition, people without personal internet access do complete transactions at other non-public locations and that completing transactions from non-public locations is a strong determinant of public transactional use.

scholarly journals The role of digital/online resources in the Jewish Diaspora communities

2019 ◽  
Author(s):  
Dov Winer
Keyword(s):  
Jewish Education ◽  
Jewish People ◽  
Digital Culture ◽  
The Internet ◽  
Web Based ◽  
Jewish Diaspora ◽  
Wide Range ◽  
Computer Based ◽  
The Impact

Globalization, in its earlier stages, was expected to erode national and ethnic identities. In contrast, ethnicity and ethnic affiliations persisted, growing socially and politically. This paper examines the role of the globalizing new communications technologies on this process, focusing on Diasporas. The study of trans-state networks based on ethnic solidarity, connections and affinities in the framework of social and political science is quite recent. Following a clarification of the distinction between classical and modern Diasporas we analyse a particular case study, that of the Jewish Diaspora. This diaspora was an early adopter of computer-based communications and the Internet for a wide range of purposes. Early events are described including the diffusion of the Internet to Israel, the planning of a Global Jewish Information Network, Israel 2020 macro scenarios for Israel and the Jewish People and the decision on Jewish Peoplehood through communication technologies. A survey of historical systems (Responsa, BBS, and Usenet) follows by a description of the Jewish population and the wide variety of Jewish Web based activities today. These include the Institutional landscape; Jewish media — press, radio, video and blogs; the impact on Jewish religious observance; Jewish genealogy; Online dating; Social networks; Jewish education; Online learning; Jewish Studies and Digital Humanities; Jewish memory. Judaica Europeana supports the activities previously described by aggregating and facilitating the access and the re-use of Jewish digital culture. Europeana is the leading global digital library for cultural heritage as well as a lively eco-system for relevant stakeholders.

Altmetrics

2020 ◽  
pp. 119-131
Author(s):  
Payel Biswas
Keyword(s):  
Peer Review ◽  
Qualitative Data ◽  
Web Based ◽  
The Social ◽  
Wide Range ◽  
The World ◽  
Areas Of Interest ◽  
Citation Metrics ◽  
The Impact ◽  
Citation Searching

According to information scientists, information is modified into knowledge by adding experience. Researchers need powerful and successful filters to help them stay abreast of literature in their field, as well as methods to track the impact of their own research in often very specialized areas of interest. Traditional mechanisms such as peer review and citation searching using bibliometrics are no longer sufficient tools to aid researchers. How can librarians become leaders and powerful allies in this new landscape? Enter the world of Altmetrics. Altmetrics, or alternative citation metrics, provides researchers and scholars with new ways to track influence across a wide range of media and platforms. Altmetrics are metrics and qualitative data that are complementary to traditional, citation-based metrics. Altmetrics is a field of web-based metrics that accounts for total author influence which also looks beyond journal and monographic citation counts to the social web. The aim of this chapter is to explain the concept of library and librarian involvement with altmetrics.

scholarly journals Energy absorption capability of laminated plates made of fully thermoplastic composite

2018 ◽  
Vol 232 (8) ◽  
pp. 1389-1401 ◽  
Author(s):  
Simonetta Boria ◽  
Alessandro Scattina
Keyword(s):  
Energy Absorption ◽  
Laminated Plates ◽  
Thermoplastic Composite ◽  
Low Velocity Impact ◽  
Thermoplastic Composites ◽  
Fibre Reinforcement ◽  
Low Velocity ◽  
Wide Range ◽  
The Matrix ◽  
The Impact

The behaviour of composites materials, made of synthetic fibres embedded in a thermoplastic resin, subjected to low velocity impacts, was largely studied in the past. However, in the last years, the use of thermoplastic composites has been increased due to the considerable advantages in terms of recyclability of this family of materials. Thermoplastic composites are composed of polymers with different material’s structure if compared to the more traditional thermoset composite. Consequently, the behaviour of these materials can be different in some loading conditions. Moreover, considering the wide range of thermoplastic composites that have been developed in the last years, the study of the behaviour of these materials, in case of impact, has not been yet widely analysed, in particular considering materials where both the matrix and the reinforcement are made of thermoplastic. In this perspective, the goal of this work is to study the behaviour of a new thermoplastic composite (PURE thermoplastic) in conditions of low velocity impact. In this material, the matrix and the fibre reinforcement are made of polypropylene both. The paper presents the results of an experimental investigation. In particular, a series of impact tests with a drop dart equipment have been carried out on laminates made of PURE thermoplastic. Laminates with different thicknesses have been taken into consideration. The influence of the impact conditions on the material’s behaviour has been investigated and the capability of energy absorption has been studied. The PURE thermoplastic showed a different behaviour in terms of energy absorption and damage mechanisms if compared to the composites presented in the literature. The thickness of the laminate has had influence on the deformation and the damage mechanism of the specimens: with low thickness, the perforation of the specimen has been obtained, whereas, with the higher thickness, the specimens have shown a ductile behaviour and extended plasticity without crack tip. The contact force between the dart and the specimen has been influenced by the energy level of the impact, but with an opposite trend if compared to that of the composites studied in the literature.

scholarly journals Analysis of a feller-buncher productivity: a case study of whole-tree harvesting from Marmara region, Turkey

2021 ◽  
Vol 64 (1) ◽  
pp. 99-110
Author(s):  
Neşe Gülci ◽  
Kıvanç Yüksel ◽  
Sercan Gülci ◽  
Hasan Serin ◽  
Ebru Bilici ◽  
...  
Keyword(s):  
Large Diameter ◽  
Tree Height ◽  
Forest Products ◽  
Forest Harvesting ◽  
Marmara Region ◽  
Harvesting Systems ◽  
Whole Tree Harvesting ◽  
Whole Tree ◽  
Diameter Classes ◽  
Tree Harvesting

In fully mechanized forest harvesting systems, tree felling activities are mostly performed by using harvesters or feller-bunchers. In some regions of Turkey, where terrain conditions and stand characteristics are suitable, fully mechanized harvesting systems have been recently practiced by some of the logging contractors as private forest industry demands for large amounts of forest products throughout the year. Thus, performances of these newly practiced harvesting systems should be carefully analyzed in order to implement productive and cost-effective mechanized harvesting systems. In this study, productivity of whole-tree harvesting using a feller-buncher was investigated based on stand parameters including tree height, DBH, and volume. The DBH of the felled trees were divided into four classes (i.e. very small: 16-19 cm, small: 20-23 cm, medium: 24-27 cm and large: 28-31 cm) to investigate the effects of various DBH class on the time consumption of cutting stage and productivity of the feller-buncher. To estimate productivity of feller-buncher in harvesting operation, multiple linear and polynomial regressions were also developed and discussed after the interpretation of diagnostic plots. The results indicated that the average productivity of the feller-buncher was 74.96 m3 /h which was closely related with tree height (r = 0.63), DBH (r = 0.67), and volume (r = 0.67). The average moving time was the most time-consuming stage (60%), followed by cutting (29%) and bunching stages (11%). It was found that DBH classes caused statistically significant (p < 0.05) effects on the time spent on cutting stage and productivity of the feller-buncher. The cutting time and productivity increased from very small to large diameter classes, while bunching time increased from very small to small diameter and then medium diameter to large diameter classes. Polynomial regression had a positive impact on the performance of the estimation model of manually field-measured data based on the error parameters.

A Simulation-Based Approach to Evaluating Commercial Thinning Decisions in Loblolly Pine Plantations

1985 ◽  
Vol 9 (4) ◽  
pp. 211-216 ◽  
Author(s):  
Thomas W. Reisinger
Keyword(s):  
Loblolly Pine ◽  
Net Present Value ◽  
Practical Method ◽  
Pine Plantations ◽  
Future Market ◽  
Simulation Techniques ◽  
Commercial Thinning ◽  
Wide Range ◽  
Harvesting Systems ◽  
The Impact

Abstract Computer simulation techniques are described which evaluate the impact of various stand conditions, management regimes, harvesting systems, and future market scenarios on current thinning decisions in pine plantations. Four simulation programs (PTAEDAR, PTAEDA, GENMAC, and HSS) were linked to predict tree growth/stand development and to model mechanized thinnings and final harvests. Simulation results were then combined with an investment analysis program to calculate the net present value of each strategy. An example analysis for a "typical" loblolly pine (Pinus taeda) plantation is presented. As described here, simulation is a practical method of evaluating the profitability of a wide range of alternatives, including planting spacings, thinning regimes, and rotation ages for managing future plantations of loblolly pine.

scholarly journals Reduced impact logging in the dried land natural production forests in Indonesia

2021 ◽  
Vol 914 (1) ◽  
pp. 012060
Author(s):  
Dulsalam ◽  
Soenarno ◽  
S Suhartana ◽  
Sukadaryati ◽  
Yuniawati ◽  
...  
Keyword(s):  
Forest Products ◽  
Timber Harvesting ◽  
Forest Harvesting ◽  
Study Data ◽  
Natural Forests ◽  
Natural Production ◽  
Production Forests ◽  
Reduce Emissions ◽  
The Impact ◽  
Reduced Impact Logging

Abstract Timber harvesting in natural production forests in Indonesia is still carried out to his day in the form of a bussines license for the utilization of timber forest products-natural forests (IUPHHK-HA). IUPHHK-HA holders have not fully implemented Reduced Impact Logging (RIL). Forest harvesting activities consisting of felling, skidding, bucking, loading, unloading, and transportation of logs are aimed at without significantly disturbing log production and its environment. The purpose of this review is to provide information on RIL in Indonesia. The collection of data was done by using a desk study. Data on productivity, efficiency, costs, damage to the residual stands, and the impact of RIL on emissions were collected. Several research results showed that: (1) logging productivities generally decreased when compared to Conventional Logging (CL), (2) logging efficiency generally increased when compared to CL, (3) logging costs generally increased in the short term, (4) residual stand damages generally reduced when compared to CL, and (5) RIL has potential to reduce emissions compared to CL. It is necessary to do the following: harvest planning such as mapping and distribution of trees, skid trail alignment, design of landings; harvest preparation such as the opening of skid trails, opening of landing places; harvesting such as determining felling direction, felling, skidding, and closure of harvesting such as closure of skid trails and landings.

Impact of COVID-19 on Nuclear Medicine in Germany, Austria and Switzerland: An International Survey in April 2020

2020 ◽  
Vol 59 (04) ◽  
pp. 294-299 ◽  
Author(s):  
Lutz S. Freudenberg ◽  
Ulf Dittmer ◽  
Ken Herrmann
Keyword(s):  
Nuclear Medicine ◽  
Health Systems ◽  
Personal Protective Equipment ◽  
Large Scale ◽  
Diagnostic Procedures ◽  
Protective Equipment ◽  
Current Crisis ◽  
Web Based ◽  
Public Versus Private ◽  
The Impact

Abstract Introduction Preparations of health systems to accommodate large number of severely ill COVID-19 patients in March/April 2020 has a significant impact on nuclear medicine departments. Materials and Methods A web-based questionnaire was designed to differentiate the impact of the pandemic on inpatient and outpatient nuclear medicine operations and on public versus private health systems, respectively. Questions were addressing the following issues: impact on nuclear medicine diagnostics and therapy, use of recommendations, personal protective equipment, and organizational adaptations. The survey was available for 6 days and closed on April 20, 2020. Results 113 complete responses were recorded. Nearly all participants (97 %) report a decline of nuclear medicine diagnostic procedures. The mean reduction in the last three weeks for PET/CT, scintigraphies of bone, myocardium, lung thyroid, sentinel lymph-node are –14.4 %, –47.2 %, –47.5 %, –40.7 %, –58.4 %, and –25.2 % respectively. Furthermore, 76 % of the participants report a reduction in therapies especially for benign thyroid disease (-41.8 %) and radiosynoviorthesis (–53.8 %) while tumor therapies remained mainly stable. 48 % of the participants report a shortage of personal protective equipment. Conclusions Nuclear medicine services are notably reduced 3 weeks after the SARS-CoV-2 pandemic reached Germany, Austria and Switzerland on a large scale. We must be aware that the current crisis will also have a significant economic impact on the healthcare system. As the survey cannot adapt to daily dynamic changes in priorities, it serves as a first snapshot requiring follow-up studies and comparisons with other countries and regions.

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