scholarly journals A practical solution: the Anthropocene is a geological event, not a formal epoch

Episodes ◽  
2021 ◽  
Author(s):  
Philip L. Gibbard ◽  
Andrew M. Bauer ◽  
Matthew Edgeworth ◽  
William F. Ruddiman ◽  
Jacquelyn L. Gill ◽  
...  
Keyword(s):  
Practical Solution ◽  
Geological Event

Access to Highly Functionalized Cyclopentenones via Diastereoselective Pauson Khand Reaction of Siloxy-Tethered 1,7-Enynes

2019 ◽  
Author(s):  
Austin Gallagher ◽  
Huan Tian ◽  
Osmar A. Torres-Herrera ◽  
Shuai Yin ◽  
Anxin Xie ◽  
...  
Keyword(s):  
Functional Group ◽  
Practical Solution

A diastereoselective Co<sub>2</sub>(CO)<sub>8</sub>-mediated Pauson-Khand reaction (PKR) of siloxy-tethered 1,7-enynes for the synthesis of cyclopentaoxasilinones has been developed. This transformation can be performed on a multi-gram scale and is characterized by broad substrate scope, functional group compatibility, and high chemo- and diastereoselectivity. Oxidation of the resulting cyclopentaoxasilinones delivers stereoenriched β-alkylated cyclopentenones, which are inaccessible by intermolecular PKRs. This research provides a practical solution to the challenges associated with the classical intermolecular PKR.

Creativity as a Resource for the Development of a Service Enterprise (Through the Example of Event Agencies)

2020 ◽  
Vol 26 (9) ◽  
pp. 957-968
Author(s):  
K. I. Derevyanko ◽  
V. P. Orlovskaya
Keyword(s):  
Scientific Information ◽  
Professional Associations ◽  
Assessment Model ◽  
Professional Activity ◽  
Special Role ◽  
Economic Knowledge ◽  
Creative Activity ◽  
Practical Solution ◽  
Expert Opinions ◽  
Theoretical Conceptualization

Aim. The presented study aims to conduct a comprehensive phenomenological analysis of creativity as a resource for the development of a service enterprise through the example of the creative activity of event agencies. Tasks. The authors examine the phenomenon of creativity and develop a theoretical framework for considering creativity as a resource for the development of a service enterprise through the example of event agencies; identify the indicators of creativity of a service enterprise; develop a scale of creativity of event agencies operating in the modern services market. Methodology. The theoretical and methodological basis of this study includes the works of Russian and foreign scientists and experts in the field of creativity and its use as a resource for the development of service enterprises. The authors use the phenomenological method (to examine the phenomenon of creativity as a whole), comparative (comparison of approaches, ideas, and experience of different countries in the field of creative activity), hermeneutical (interpretation of various aspects related to the analysis of creativity), and systems analysis. To examine the indicators of creativity of event agencies, this study uses quantitative and qualitative analysis of information materials published on the official websites of the examined cities, convention and event agencies, statistics of professional associations of congress and exhibition organizations, including the International Congress and Convention Association (ICCA), as well as other analytical reports, expert opinions, and applied research on the topic. The study analyzes statistics on the number and themes of events held in each city, event infrastructure, the range of provided services, and the level of service. The cities are then comparatively analyzed based on the results of examination of each city, and general conclusions are formulated. Results. The main problem addressed by this study is associated with the concept of “creativity”, its content, degree, limits, and risks. The scientific novelty of the study is predicated upon the insufficient investigation of the problem of creativity as a resource for the development of a service enterprise. This study is one of the first attempts to develop a methodology for comprehensively analyzing the phenomenon of creativity with regard to event agencies. The results obtained during the study are vital for the theoretical conceptualization and practical solution of the problem of creativity in the context of economic knowledge: the key indicators of creativity of an event agency are identified and a creativity assessment model is developed based on the range of possible manifestations of creativity in the professional activity of event agencies. Creativity is analyzed as a resource for the development of a service enterprise through the example of the activity of event agencies. Eight indicators of creativity of an event agency are identified and an assessment scale is developed. The creativity indicators include “fluency”, “flexibility”, “originality”, “elaboration and synthesis”, “redirection”, “redefinition”, “reinitiation”, and “generation”. These eight indicators are incorporated into a creativity scale based on the Likert scale, which makes it possible to assess the degree (level) of creativity of an event agency on a scale of one to ten. As a result, the following problems are solved: the essence of the concept of “creativity” is determined and its main features are identified by analyzing the specific aspects of the modern MICE industry landscape. Scientific information on the topic is analyzed, systematized, and generalized. Russian and foreign experience of using creativity as a resource for the development of a service enterprise is comparatively analyzed. Conclusions. The special role of creativity as a resource for the development of an event agency is revealed, and the indicators of the agency’s creativity are formulated. A creativity scale is developed. The correlation between the competitiveness of a service enterprise and the use of the creative resource in its development is determined. This study is one of the first attempts to develop a methodology for comprehensively analyzing the phenomenon of creativity with regard to event agencies. The results of the study are important for the theoretical conceptualization and practical solution of the problem of creativity in the context of economic knowledge.

Nutrient Removal in Small Wastewater Treatment Plants

1990 ◽  
Vol 22 (3-4) ◽  
pp. 211-216
Author(s):  
Niels Skov Olesen
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Wastewater Treatment Plants ◽  
Ferrous Sulphate ◽  
Practical Solution ◽  
Sensitive Technique ◽  
Pumping Station ◽  
Denitrification Reactor

In some areas of Denmark nutrient removal is required even for very small wastewater plants, that is down to 500 pe (pe = person equivalents). The goal for the removal is 80% removal of nitrogen and 90% removal of phosphorus, or in terms of concentrations: 8 mg nitrogen/l and 1.2 mg phosphorus/l. The inlet concentrations are typically 40 mg N/l and 10 mg P/l. The paper presents the results from two such plants with a capacity of 800 pe. Phosphorus removal is made by simultaneous precipitation with ferrous sulphate. Nitrogen removal is carried out using the recirculation method. Both plants were originally rotor aerated oxidation ditches. They have been extended with a denitrification reactor and a recirculation pumping station. At present both plants have been in activity for about 3 years and with satisfactory results. Average concentrations of nitrogen (summer) and phosphorus is 7 mg/l and 0.9 mg/l respectively. Nitrogen removal seems to be a practical solution on these small plants. It is,though, sensitive to temperature and highly oxidized rain water. Phosphorus removal seems to be an easily run and relatively non-sensitive technique at least when using simultaneous precipitation.

Mix Networks: Existing Scenarios and Future Directions on Security and Privacy

2019 ◽  
Vol 14 ◽  
Author(s):  
Khaleel Ahmad ◽  
Afsar Kamal
Keyword(s):  
Security And Privacy ◽  
Research Progress ◽  
Future Research ◽  
Future Directions ◽  
Practical Solution ◽  
Research Gap ◽  
The Web ◽  
Privacy Enhancing Techniques

Background: Privacy enhancing techniques are developed in order to provide strong protection to cyberspace. These techniques aim to allow users to keep their identities hidden during the communication when they are sending email, making payments online, browsing the Web or posting to newsgroups. MixNet is the most practical solution for concealing identities of message and sender’s identities. Objective: It provides sender and receiver anonymity as well as message security. The main goal of MixNet is to overcome vulnerability and enhance the performance of communication. It can efficiently handle the messages of various length and produce desirable results with privacy. The main objective of this paper is to acquire information and concepts regarding MixNet. We also provide guidelines for future research and references. Methods : The designing of MixNet depends on what cryptosystem method is used. Symmetric and Asymmetric both are used. Other methods could be also used such as PIR, CSP and FDR model, RPC, Token-based approach or others. Result: In this paper we provide an overview of MixNet approaches and presented a survey on MixNet based techniques and different models. We also constructed the comparison tables as per our requirements for better understanding. For this purpose, we found a total of 120 articles related to the MixNet published between 1990 and 2018 from the most relevant scientific resources. However, only 86 papers were analyzed due to comprehensiveness and relevancy to this article. Conclusion: Focused on the security and privacy of communication and how it can be achieved. This survey also reveals research progress and research gap on MixNet.

Managing Total Circulation Losses with Pressurized Mud Cap Drilling (PMCD) During Completion: Case History of Practical Solution

2016 ◽  
Author(s):  
Madina Hajiyeva ◽  
Godwin A. Osuji-Bells ◽  
M. Rizwan Rozlan ◽  
Orient B. Samuel ◽  
Zahari M. Zulkhairi ◽  
...  
Keyword(s):  
Case History ◽  
Practical Solution ◽  
History Of ◽  
Total Circulation

scholarly journals Density Guarantee on Finding Multiple Subgraphs and Subtensors

2021 ◽  
Vol 15 (5) ◽  
pp. 1-32
Author(s):  
Quang-huy Duong ◽  
Heri Ramampiaro ◽  
Kjetil Nørvåg ◽  
Thu-lan Dam
Keyword(s):  
Lower Bound ◽  
State Of The Art ◽  
The State ◽  
The Other ◽  
Exact Methods ◽  
Practical Solution ◽  
Novel Approach ◽  
Wide Range ◽  
Real World Datasets ◽  
Tensor Data

Dense subregion (subgraph & subtensor) detection is a well-studied area, with a wide range of applications, and numerous efficient approaches and algorithms have been proposed. Approximation approaches are commonly used for detecting dense subregions due to the complexity of the exact methods. Existing algorithms are generally efficient for dense subtensor and subgraph detection, and can perform well in many applications. However, most of the existing works utilize the state-or-the-art greedy 2-approximation algorithm to capably provide solutions with a loose theoretical density guarantee. The main drawback of most of these algorithms is that they can estimate only one subtensor, or subgraph, at a time, with a low guarantee on its density. While some methods can, on the other hand, estimate multiple subtensors, they can give a guarantee on the density with respect to the input tensor for the first estimated subsensor only. We address these drawbacks by providing both theoretical and practical solution for estimating multiple dense subtensors in tensor data and giving a higher lower bound of the density. In particular, we guarantee and prove a higher bound of the lower-bound density of the estimated subgraph and subtensors. We also propose a novel approach to show that there are multiple dense subtensors with a guarantee on its density that is greater than the lower bound used in the state-of-the-art algorithms. We evaluate our approach with extensive experiments on several real-world datasets, which demonstrates its efficiency and feasibility.

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