Some Recent Developments in the Design of Rigid Airships

1927 ◽  
Vol 31 (203) ◽  
pp. 1029-1036
Author(s):  
W. T. Sandford
Keyword(s):  
Complete Analysis ◽  
Commercial System ◽  
Express Train ◽  
Ocean Liner ◽  
Recent Developments ◽  
Safety And Reliability ◽  
The Subject ◽  
Minimum Ratio ◽  
Horse Power

This paper is primarily intended to stimulate discussion on a subject of increasing interest to aeronautical students and of rapidly growing interest to commercial aeronautics. It must not by any means, therefore, be looked upon as a complete analysis of the subject, but rather as an introduction to the most important questions arising in recent development.In considering this question we must first define the particular requirements of the large rigid airship. The airship must be looked upon with regard to the aeroplane rather as the ocean liner is looked upon with regard to the express train and not in any sense as a rival of the aeroplane. They each have their own distinctive duty.Any commercial system depends upon safety and reliability. The airship designer has, therefore, the problem of making a structure safe under any conditions of flight and having a minimum ratio of structural weight to useful weight per horse-power.

Import Need for Wound Care and Burn Dressings in India: A Bioeconomic Challenge

2019 ◽  
Vol 6 (3) ◽  
pp. 182-191
Author(s):  
Vibhu Yadav ◽  
Amit Mittal ◽  
Parikshit Bansal ◽  
Sachin K. Singh
Keyword(s):  
Wound Dressing ◽  
Wound Care ◽  
Business Strategies ◽  
Complete Analysis ◽  
Growth Strategies ◽  
The Past ◽  
Recent Developments ◽  
Import And Export ◽  
The Subject ◽  
Research Analysis

Objective: To present an overview of import need for wound care and burn dressings in India. This article provides a complete analysis of the import-export value of wound care and burn dressings in India. It helps in preparing growth strategies, knowledge about leading players, recent developments, business strategies, and manufacturing status of the wound care and burn dressings in India. Methodology: A trend analysis of import-export was carried out for wound and burn dressings in India. Raw data of the years (2008-2017) were collected from various market research analysis sites and import need was identified. Results and Discussion: The detailed analysis reveals that India is a growing market for wound and burn dressings and spends a lot of the exchequer on importing the subject commodity. Wound dressing export is averaged to the same from 2013 to 2017. India saw a rise in wound dressing export after 2012. India saw a rise of wound dressing import over the past 10 years. It averaged 502.6 million from 2008 to 2017 and it reached its all-time high of 765 million in 2016. The import value was found quite high as compared to export. Conclusion: The report of import and export analysis very clearly highlights that there is a strong demand for dressings in the country and due to lack of own manufacturers of such dressing in India, these are imported. Since these products are expensive, there is a large outflow of Indian currency due to imports. It is imperative that such products get government attention and should be manufactured within the country.

Maximization of the Signal Impulsiveness Combining Envelope Technique with Minimum Entropy Deconvolution

2013 ◽  
Vol 392 ◽  
pp. 725-729 ◽  
Author(s):  
Rafael José Gomes de Oliveira ◽  
Mauro Hugo Mathias
Keyword(s):  
Test Bench ◽  
Minimum Entropy ◽  
Combined Application ◽  
Recent Developments ◽  
Gear Trains ◽  
The Subject ◽  
Using Data ◽  
High Frequency Resonance ◽  
Combined Technique ◽  
Experimental Test Bench

The application of the HFRT (High-Frequency Resonance Technique), a demodulation based technique, is a technique for evaluation the condition of bearings and other components in rotating machinery. Another technique MED (Minimum Entropy Deconvolution) has been the subject of recent developments for application in condition monitoring of gear trains and roller bearings. This article demonstrates the effectiveness of the combined application of the MED technique with HFRT in order to enhance the capacity of HFRT to identify the characteristic fault frequencies of damaged bearings by increasing the signal impulsivity. All tests were done using data collected from an experimental test bench in laboratory. The Kurtosis value is used as an indicator of effectiveness of the combined technique and the results shown an increase of five times the original kurtosis value with the application of MED filter together with the HFRT.

scholarly journals Recent developments on the Stieltjes transform of generalized functions

1987 ◽  
Vol 10 (4) ◽  
pp. 641-670 ◽  
Author(s):  
Ram Sankar Pathak ◽  
Lokenath Debnath
Keyword(s):  
Final Section ◽  
Generalized Functions ◽  
Stieltjes Transform ◽  
Poisson Transform ◽  
Open Questions ◽  
The Laplace Transform ◽  
Recent Developments ◽  
The Subject ◽  
Abelian Theorems ◽  
Stieltjes Transforms

This paper is concerned with recent developments on the Stieltjes transform of generalized functions. Sections 1 and 2 give a very brief introduction to the subject and the Stieltjes transform of ordinary functions with an emphasis to the inversion theorems. The Stieltjes transform of generalized functions is described in section 3 with a special attention to the inversion theorems of this transform. Sections 4 and 5 deal with the adjoint and kernel methods used for the development of the Stieltjes transform of generalized functions. The real and complex inversion theorems are discussed in sections 6 and 7. The Poisson transform of generalized functions, the iteration of the Laplace transform and the iterated Stieltjes transfrom are included in sections 8, 9 and 10. The Stieltjes transforms of different orders and the fractional order integration and further generalizations of the Stieltjes transform are discussed in sections 11 and 12. Sections 13, 14 and 15 are devoted to Abelian theorems, initial-value and final-value results. Some applications of the Stieltjes transforms are discussed in section 16. The final section deals with some open questions and unsolved problems. Many important and recent references are listed at the end.

The Insane Jew

1900 ◽  
Vol 46 (195) ◽  
pp. 731-737 ◽  
Author(s):  
Cecil F. Beadles
Keyword(s):  
Complete Analysis ◽  
The Subject

A complete analysis of the mentally-afflicted Jew is far too vast a subject to bring before this meeting, and any attempt to give you the entire result of my investigation into the subject would occupy far too much of your time.

The Use of Fibre Optic Techniques for Temperature Measurement

1987 ◽  
Vol 20 (6) ◽  
pp. 32-39 ◽  
Author(s):  
K T V Grattan
Keyword(s):  
Temperature Measurement ◽  
Subject Area ◽  
Temperature Sensing ◽  
Rapid Expansion ◽  
Fibre Optic ◽  
Recent Developments ◽  
The Subject

The subject area of fibre optic sensing is one in which there has been shown a very rapid expansion of interest over the last few years. Many novel techniques are appearing in the literature and some products are available to the industrial user. The background to fibre optic means of temperature sensing and some recent developments will be reviewed in this paper.

Heat Liberation and Transmission in Large Steam-Generating Plants

1933 ◽  
Vol 125 (1) ◽  
pp. 201-289
Author(s):  
E. W. Robey ◽  
W. F. Harlow
Keyword(s):  
Heat Liberation ◽  
Dew Point ◽  
Flue Gases ◽  
Plant Performance ◽  
Laboratory Research ◽  
Frictional Loss ◽  
Boiler Plant ◽  
Recent Developments ◽  
The Subject ◽  
Secondary Air

The demand for heavier duties and exacting guarantees of performance which has accompanied recent developments in steam-raising plants, has necessitated closer inquiry into the fundamental principles on which their performance depends. The authors present their views on certain aspects of the subject. These have been formed as a result of experience, combined with a consideration of the work of laboratory investigators. It would appear that important facts revealed by laboratory research do not always receive the attention due to them, and frequently erroneous ideas persist for years without question. The paper discusses the function of the chain grate mechanical stoker with particular reference to the subject of furnace design and secondary air application. It deals with the effect on the size and cost of equipment generally, which would result from a closer observance of the laws of heat transfer and frictional loss in flowing gases, and discusses particularly the phenomenon of delayed heat release in flue gases and the effect of this in boiler plant performance. The cause and prevention of air heater corrosion is dealt with, and the results of investigations into the dew point temperature of flue gases are given.

Status of Centrifugal Impeller Internal Aerodynamics—Part II: Experiments and Influence of Viscosity

1980 ◽  
Vol 102 (3) ◽  
pp. 738-746 ◽  
Author(s):  
D. Adler
Keyword(s):  
Viscous Flow ◽  
Experimental Work ◽  
State Of The Art ◽  
Centrifugal Impeller ◽  
Future Research ◽  
Research Topics ◽  
Flow Problems ◽  
Recent Developments ◽  
Internal Aerodynamics ◽  
The Subject

Recent developments in internal viscous aerodynamics of centrifugal impellers and related flows are critically reviewed. The overall picture which emerges provides the reader with a state-of-the-art perspective on the subject. Gaps in understanding are identified to stimulate future research. Topics included in this review are: experimental work carried out in the last decade, the structure of turbulence in curved rotating passages and solution of viscous flow problems in impellers.

The main trends in the Russian tourism and hospitality market from the point of view of Russian travel agencies

2018 ◽  
Vol 10 (4) ◽  
pp. 412-420 ◽  
Author(s):  
Aleksandr Gudkov ◽  
Elena Dedkova ◽  
Kristina Dudina
Keyword(s):  
Relevant Information ◽  
Tourism Industry ◽  
Point Of View ◽  
Content Type ◽  
Qualitative Research Methodology ◽  
Recent Developments ◽  
Survey Results ◽  
The Subject ◽  
Tourism And Hospitality ◽  
The Impact

PurposeThis paper aims to discuss recent developments in the Russian tourism industry and the main reasons for new initiatives in local destination development.Design/methodology/approachThe study is based on qualitative research methodology. A summary of key literature is presented alongside the analysis of the survey results.FindingsThis paper sheds light on the challenges and changes that took place in the Russian tourism business between 2014 and 2017. The subject is poorly covered in academic literature. The basic data for analysis presented in official statistics are scarce. Therefore a more effective way of obtaining relevant information was to conduct a survey using a semi-structured questionnaire, with tourism business actors as respondents.Research limitations/implicationsThis paper provides mostly conceptual analysis based on limited empirical data; directions for further empirical research are proposed in the conclusion.Originality/valueThe paper reveals something of the impact of economic and geopolitical factors, both negative and positive ones, on the restructuring of the Russian tourism market and the emergence of promising opportunities for the development of new domestic destinations. As a result, tourism market actors are able to become more diverse.

From Casimir Forces to Black-Body Radiation: Quantum and Thermal Fluctuations

2017 ◽  
Author(s):  
Alejandro W. Rodriguez ◽  
Adolfo Plasencia
Keyword(s):  
Driving Force ◽  
Black Body ◽  
Thermal Fluctuations ◽  
Black Body Radiation ◽  
Casimir Forces ◽  
Princeton University ◽  
Virtual Photons ◽  
Recent Developments ◽  
The Subject ◽  
Relationship Of

This dialogue with physicist Alejandro W. Rodríguez is in two parts. The first part, which took place in the MIT campus, reflects on how theory has been overtaking experimentation in recent developments in science. It also addresses the subject of the Casimir forces and their effects by using devices which benefit from them in everyday life. Later, Alejandro explains why the vacuum is not empty; and, what are the "virtual photons". In the second part, Alejandro explains his current research in the Department of Electrical Engineering of Princeton University, focusing on the black body; and quantum and thermal processes of electromagnetic fluctuations at the nanoscale, where the rules of quantum mechanics now hold sway. He is now studying quantum fluctuations and how the forces and energy exchanged between objects work. This all-important area is the current driving force for development in the field of thermovoltaic energy and thermal panels for capturing light; an area with a revolutionary potential capable of changing the existing relationship of humans with energy, technology and the environment, in other words, with the planet.

Recent Developments in the Historiography of Silesian Jews

2001 ◽  
pp. 339-351
Author(s):  
Wodziński Marcin
Keyword(s):  
Jewish Community ◽  
Abandoned Field ◽  
Judaic Studies ◽  
Recent Developments ◽  
History Of ◽  
The Subject ◽  
Double Threshold

This chapter reviews some recent studies on the Jews of Silesia. The history of the Jews in Silesia became an abandoned field for nearly two decades. Isolated, if sometimes very interesting, studies appeared (including works by Stefi Jersch-Wenzel and Karol Jonca), but they did not maintain the continuity of research, and it could certainly not be said that there was any systematic interest in the subject. But with the renaissance of Judaic studies in Germany and Poland in the second half of the 1980s came a revival of interest in Silesian Jewry. Two conferences on the history of the Jewish community in Silesia, organized almost simultaneously, can be regarded as a symbolic double threshold: the first took place at the Institute of History at Wrocław University in June 1988, the second, a year later in Berlin.

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