117,319 research outputs found
Investigations into the effectiveness of measures to reduce the energy requirements of domestic dwellings in Cyprus
No full textThis thesis was submitted for the degree of Doctor of Philosophy and was awarded by Brunel University.In recent years there has been an increasing trend in the provision of central heating and
split vapour compression air conditioning systems to domestic dwellings in Cyprus. To
minimise their economic and environmental impact, this study examines the feasibility
and economic viability of energy conservation measures and the feasibility of the
application of solar driven LiBr-water absorption system for space conditioning.
Initially, the study compares through simulation, the heating and cooling requirements
of domestic dwellings constructed in Cyprus during the last century. The simulations
required values for the thermal conductivity of local building materials, like the hollow
brick and mud and straw block. These were not available, and measurements were
performed on a machine specifically purchased for the project to establish these values
for the first time. These material properties will be of value to building services
engineers in Cyprus and the Middle East for the more precise determination of building
heating and cooling loads.
Evaluation of the internal conditions resulting from the various types of constructions
indicated that the traditional and insulated modem houses, could maintain indoor
temperature in winter between 16°C and 20°C, but in the summer temperatures
exceeded 36°C. The use of natural and mechanical ventilation could reduce slightly the
maximum indoor summertime temperatures, but not to a level that could provide
thermal comfort.
Window gains are an important factor in domestic building energy requirements, and
significant savings can result when extra measures are taken. The savings in cooling
energy demand for a well-insulated house may be as high as 24% when low-emissivity
double glazed windows are used compared to clear double glazed windows giving a
pay-back period of 3.8 years. Other factors investigated are the effect of overhangs,
shape and orientation of buildings and thermal mass. The results show that the roof is
the most important structural element of domestic dwellings in the Cypriot environment.
For good thermal performance, the roof must offer a discharge time of 6 hours or more
and have a thermal conductivity of less than 0.48 W/m-K. Life cycle cost analysis has
shown that measures that increase the roof insulation pay back in a short period of time,
between 3.5 to 5 years. However, measures taken to increase wall insulation pay back in
a longer period of time, approximately 10 years.
The only natural energy resource abundantly available in Cyprus is solar energy, which
could be used to power a low energy active cooling system based on the absorption
cycle. To facilitate investigation of the feasibility of the application of solar driven
absorption systems for domestic cooling, a 1 kW LiBr-water absorption-cooling unit
was designed and constructed. The unit was used to determine experimentally the heat
and mass transfer coefficients in the heat exchangers of absorption systems. In certain
cases these were found to differ considerably from values obtained from heat and mass
transfer correlations published by other investigators. The experimentally determined
heat and mass transfer coefficients were employed in the design and costing of an 11
kW cooling capacity solar driven absorption cooling machine which, from simulations,
was found to have sufficient capacity to satisfy the cooling needs of a well insulated
domestic dwelling. Economic analysis has shown that for such a system to be
economically competitive compared to conventional cooling systems its capital cost
should be below C£ 2000. This drawback can be balanced by a lower total equivalent
warming impact being 2.7 times smaller compared to conventional cooling systems.Higher Technical Institute Research Committe
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Grapevine roditis leaf Discoloration-associated virus: express pest risk analysis for Ukraine
No full textAim. To conduct an express pest risk analysis of Grapevine Roditis leaf discoloration-associated virus (GRLDaV) for
Ukraine, a virus that has been related to a grapevine disease and was included in the EPPO Alert List in 2018. Methods. The
phytosanitary risk analysis was carried out on the basis of an analytical review of expert literature and in accordance with the
EPPO Decision-support scheme for an Express Pest Risk Analysis (EPPO, 2012) and with methodological recommendations
for Ukraine (Pylypenko et al, 2012). The possibility of further spread and the potential range of the virus were determined
using modern software packages AgroAtlas (Afonin and Li, 2011; Shumilin and Li, 2009), MapInfo Pro15.0 (ESTIMap®)
and IDRISI SELVA (Clarklabs®). Results. An express pest risk analysis of GRLDaV for Ukraine was carried out for the
first time. Outbreaks of the virus were first detected in the 1980ies in Greece (Rumbos, Avgelis, 1989) and from 2014–2018
in: Italy (Chiumenti et al, 2015, 2016; Maliogka et al, 2015), Turkey (Adan, 2016; Serçe et al, 2018) and Croatia (Vončina
et al, 2018). Climatic predictors were analyzed in the outbreaks of the countries where the causal agent of the disease was
identified. The potential range of GRLDaV in Ukraine has been established in case of importing infected planting material
with further spreading of the virus. Risk management measures are proposed, which envisage including GRLDaV in the list
of the Regulated Non-Quarantine Harmful Organisms of Ukraine. Conclusions. There is a possibility of introduction, further
spread, and harmfulness of Grapevine Roditis leaf discoloration-associated virus in Ukraine, which is due to the presence
of the host plant (grapevine, Vitis vinifera ssp. vinifera L.) and the corresponding climatic conditions of the southern and
(part of) western Ukraine, where grapevine is cultivated on an industrial scale. The introduction of GRLDaV into Ukraine
is possible as a result of the import of GRLDaV-infected grapevine planting material from the countries where the virus has
been reported and presumably is still present. The current Ukrainian phytosanitary measures cannot reliably prevent the risk
of intoduction of GRLDaV into Ukraine. The inclusion of GRLDaV in the List of the Regulated Non-Quarantine Harmful
Organisms of Ukraine with the recommendation of permission to import grapevine planting material certified for the absence
of GRLDaV (from the countries where the virus is reported) or mandatory testing of imported grapevine planting material
for the presence of GRLDaV (from areas where such certification is absent), can be an effective risk management measure. It
requires the producers and importers of grapevine planting material to include GRLDaV virus in their certification schemes
to prevent eventual further spreading of the virus. It is recommended to do a nation-wide survey to determine the likelihood
of the presence of GRLDaV in the region. Further research to identify possible natural virus vectors and to develop methods
of (latent) GRLDaV diagnostics are needed. Finally additional studies on prevention and control of the virus (including
breeding for resistance) are also required.</jats:p
Sarah L. Blum Author Visit - Warrior Nurse: PTSD and Healing
No full textHear Sarah L. Blum, author of Women Under Fire: Abuse in the Military, discuss her newest book, Warrior Nurse: PTSD and Healing followed by a Q&A and book signing.
Sarah L. Blum is a decorated Vietnam veteran who served as an operating room nurse during the intense fighting of 1967. In recognition of her service, she was awarded the Army Commendation Medal.
Sponsored by CWU Veterans Center and CWU Libraries.https://digitalcommons.cwu.edu/libraryevents/1252/thumbnail.jp
Lillian L. Lambert, Author, Speaker, and Entrepreneur
No full textLillian L. Lambert, Author, Speaker, and Entrepreneu
Letter to Alfred L. Shoemaker, February 10, 1948
No full textA handwritten letter from an unknown author addressed to Alfred L. Shoemaker, dated February 10, 1948. Within, the author discusses the Pennsylvania Dutch word for Ash Wednesday, along with traditions associated with this day.https://digitalcommons.ursinus.edu/shoemaker_documents/1118/thumbnail.jp
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