1,720,988 research outputs found
Roles of waste glass and the effect of process parameters on the properties of sustainable cement and geopolymer concrete—a state-of-the-art review
Get PDFRecent research has revealed the promising potential of using waste glass (WG) as a binder or inert filler in cement and geopolymer concrete to deliver economic and environmental benefits to the construction sector. However, the outcomes obtained by different research groups are scat-tered and difficult to compare directly because of isolated process parameters. In this study, the roles and impacts of WG and process parameters on the performance of WG-added cement and geopolymer concrete are critically reviewed. This study reveals that the chemical and mineralogical composition, and particle size of WG, mix proportion, activation, and curing condition of concrete are the most important parameters that affect the dissolution behavior of WG and chemical reactiv-ity between WG and other elements in concrete; consequently, these show impacts on properties of concrete and optimum WG level for various applications. These parameters are required to be op-timized based on the guidelines for high pozzolanicity and less alkali–silica reactivity of WG in concrete. This review provides a critical discussion and guidelines on these parameters and the chemistry of WG in cement and geopolymer concrete for best practice and highlights the current challenges with future research directions
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Development of cryopreservation based conservation approaches for Cydonia oblonga Mill. and Olea Europeae L
No full textEThOS - Electronic Theses Online ServiceGBUnited Kingdo
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
SALT STRESS MITIGATION BY SEED PRIMING IN FABA BEAN (Vicia faba L.)
Get PDFA Thesis
Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfillment of the requirements
for the degree
of
MASTER OF SCIENCE (MS)
IN
HORTICULTURE
SEMESTER: JANUARY-JUNE, 2018A pot experiment was conducted at the Horticulture Farm of Sher-e-Bangla
Agricultural University, Dhaka, Bangladesh during the period from October
2017 to April 2018. The experiment consisted of two factors: Factor A:
Different level of saline in soil with NaCl solution such as, S
: Control (0 mM
NaCl), S
2
: 40 mM NaCl, S
3
: 80 mM NaCl, S
4
1
: 120 mM NaCl and Factor B:
Different type of seed priming , viz. P
1
: Non primed , P
2
: Hydroprimed and P
:
Ascorbic acid priming (100 mg/L). The experiment was laid out in completely
randomized design with 3 replications. Salinity level and different type of seed
priming showed significant variation with most of the parameters. In case of
salinity the total pod weight per plant was recorded highest (90.19 g) from S
while the lowest from S
(17.34 g). For priming total pod weight per plant was
recorded highest (66.29 g) from P
4
3
while the lowest from P
(37.99 g). For
combined effect total pod weight per plant was recorded highest (107.09 g)
from P
3
S
1
while the lowest from P
2
S
4
1
(16.41 g). So, the use of ascorbic acid
priming (100 mg/L) in lowest level of salinity S
(0 mM NaCl) was the best for
growth and yield of faba bean.
1
3
Craniofacial morphometry in Saudi population
Get PDFThe purpose of this research is to have a better understanding of the craniofacial
morphometric structures and comparison of the sexual dimorphism of the Saudi
population. The ethnicity, hard tissue,soft tissue and dental features should be considered
during treatment, especially in orthodontics and orthognathic surgery. Lateral
cephalometric radiograph for cephalometric analysis provides details about skeletal
structure relationships, relationships between skeletal structures with the teeth and facial
soft tissue structures. The lateral cephalometric radiographs help the orthodontists to pay
attention to the current facial structures as well as predict future facial growth when
planning a treatment plan for the patient. It is a cross sectional study of 500 lateral
cephalometric radioghraphs which contain 250 males and 250 females. These samples
were recruited from the Dental Center, King Khalid General Hospital, Hafer al Batin,
Kingdom of Saudi Arabia with age group 18 to 30 years old. All the radiographs were
traced by using CASSOS software. All the radiographs were analyzed by using Burstone,
Down, Eastman, Holdaway, Jarabak, McNamara, Ricketts, Steiner, Tweed, Wits analysis.\ud
In this study there were some statistically differences in some of the measurements as
compared to other established morphometric data, therefore Saudi population requires its
own cephalometric analysis as a reference. Multi cephalometric analysis are essential for
providing complete craniofacial morphometric information whereby it‘s included hard
tissue, soft tissue and dental structures of its own racial group
ENHANCEMENT OF SALT TOLERANCE IN RICE THROUGH PLANT GROWTH-PROMOTING RHIZOBACTERIA
Get PDFA thesis
Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
IN
AGRONOMYThe ongoing expansion of global salt-affected land is a significant factor limiting crop
growth and yield, particularly for rice. This experiment explores the mitigation of saltinduced
damage
on
rice
(Oryza
sativa
L.
cv
BRRI
dhan100)
by
applying
plant
growthpromoting
rhizobacteria (PGPR) cultures. This experiment followed a completely
randomized design (CRD) and experimental duration was December 2022 to May
2023. where rice seedlings, five and six weeks post-transplanting, were subjected to salt
stress via two treatments with 50 and 100 mM NaCl at seven-day intervals. Bacterial
cultures, comprising endophytic PGPR strains (Bacillus subtilis and B. aryabhattai)
and an epiphytic PGPR strain (B. aryabhattai), were administered at three critical
stages: during transplantation of 42-d-old seedlings, five weeks later at the vegetative
stage at 35 days after transplanting (DAT), and seven weeks later at 49 DAT during
panicle initiation stage. Salt stress prompted osmotic, ionic, and oxidative stress in rice
plants, causing a dose-dependent decrease in relative water content, chlorophyll
content, stomatal conductance, chlorophyll fluorescence, IAA concentrations, and
various growth parameters. Furthermore, osmotic stress escalated the hydrogen
peroxide content and proline accumulation, while ionic stress disrupted ion balance by
increasing Na
+
and reducing K
+
content. Both types of stress generated reactive oxygen
species, impairing the antioxidant defense system and causing oxidative damage,
visible in heightened malondialdehyde levels and electrolyte leakage. PGPR treatment
alleviated these negative effects by enhancing osmotic and ionic balance, demonstrated
by improved water balance and reduced Na
+
content and Na
+
/K
+
ratio. Additionally,
PGPR fortified the antioxidative defense system in salt-exposed rice plants by
increasing ascorbate and glutathione levels. The introduction of PGPR led to
enhancements in yield attributes (including effective tillers per hill, panicle length,
rachis per panicle, filled grains per panicle, and 1000-grain weight), consequently
boosting the grain yield per hill. In conclusion, this research highlights the potential of
PGPR to bolster physiological and biochemical functionality in rice, serving as an
effective buffer against salt stress-induced damag
Methodology for Project Schedule Acceleration Integrated with Energy Source-Based Assessment of Occupational Health and Safety Risks
Get PDFThere will always be uncertainties and hazards involved with project activities in the construction industry. Both long-term and short-term safety events reported to occupational health and safety authorities are impacted by the practice of schedule compression by crashing the project activities. Project activities with high occupational health and safety risks, such as tunnel construction projects, are subject to considerable uncertainties as it includes many hazardous and risky tasks.
This research proposes a measure of risk indexing based solely on the energy sources associated with particular project situations and construction processes being planned. Identifying and assessing risks in planning construction activities is to anticipate and prevent potential problems from manifesting at the worksite. It is often far less expensive to eliminate problems at the construction planning stage than to modify the work site later to eliminate or mitigate a hazard. The method developed in this thesis is associated with the related risk factors of ten significant types of energy release categorized by the American Society of Safety Professionals (namely, Mechanical, Biological, Temperature, Chemical, Pressure, Electrical, Radiation, Sound, Gravity and Motion).
As the concern for occupational health and safety in construction increases, a variety of preventive measures have been implemented to mitigate risks associated with hazardous activities. The current practice of project acceleration planning would result in increased vulnerability regarding occupational health and safety (OHS) risks, especially on projects susceptible to high-level hazards in construction. The proposed research defines a new project planning problem termed “minimizing project schedule at lowest safety risks'' and develops generic solutions based on a structured risk analysis methodology.
In planning construction activities, risk identification and assessment are essential to anticipate and prevent potential problems from manifesting on site. Often, it is much more cost-effective to eliminate issues at the planning stage of construction than to modify the work site later to eliminate or mitigate hazards. The energy source-based risk indexing method developed in this research serves as a breakdown structure of risks in order to quantify the risk index value. Based on the construction process design, risk indexing is performed by evaluating the probability and severity of associated risk factors. Analyses of energy source-based safety risk indexes offer a valuable method of scientific inquiry that has predictive validity, contributing to our understanding of hazards and risks that may cause accidents and injuries. Furthermore, the developed computerized technique can be used by the project managers to determine (i) the method of risk mitigation during project planning and scheduling; and (ii) the individual activity times along with assessed risk indexes that result in the shortest project time at the lowest total risk index. Additionally, the proposed method is formulated to mitigate the substantial increment of OHS-related risks due to accelerating construction progress on projects by avoiding the incurrences of unnecessary activity time crashing and associated OHS-related risks.
A practical case in the context of planning a tunnel construction project is presented to demonstrate the complete application of the proposed research. In addition, another 100-activity case was conducted in order to validate the potential benefits and applicability of the developed methodology for planning critical activity accelerations in the construction industry. Conclusions are drawn to summarize the contributions of the present research and identify opportunities to pursue in the near future
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
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