Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

2018

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 167011 - 167040 of 170024

Full-Text Articles in Entire DC Network

The Determinant Of Selfless Misuse Intention And The Role Of System Resilience Under The Context Of Disasters, Insu Park, Dheyaaldin Alsalman Jan 2018

The Determinant Of Selfless Misuse Intention And The Role Of System Resilience Under The Context Of Disasters, Insu Park, Dheyaaldin Alsalman

Research & Publications

The extant literature has investigated how individuals engage in inappropriate behaviors based on the rational choice theory (RCT), and the neutralization theory under normal situations, however it has given little consideration to how individuals engage in inappropriate behaviors under the context of disasters. To fill this research gap, we propose a selfless misuse model, which offers a theoretical explanation for the impact of the concept of bounded rationality on individuals’ selfless misuse intention under the context of disasters. In addition, to reduce this misuse behavior, we aim to investigate the role of system resilience in assisting employees to make better …

Go to article

Classifying Facts And Opinions In Twitter Messages: A Deep Learning-Basedapproach, Ronghua Shan, Swayambhu P. Chatterjee, Shuyuan Deng, Jun Liu, Wu Jiao Jan 2018

Classifying Facts And Opinions In Twitter Messages: A Deep Learning-Basedapproach, Ronghua Shan, Swayambhu P. Chatterjee, Shuyuan Deng, Jun Liu, Wu Jiao

Research & Publications

Massive social media data present businesses with an immense opportunity to extract useful insights. However, social media messages typically consist of both facts and opinions, posing a challenge to analytics applications that focus more on either facts and opinions. Distinguishing facts and opinions may significantly improve subsequent analytics tasks. In this study, we propose a deep learning-based algorithm that automatically separates facts from opinions in Twitter messages. The algorithm outperformed multiple popular baselines in an experiment we conducted. We further applied the proposed algorithm to track customer complaints and found that it indeed benefits subsequent analytics applications.

Go to article

Toward Understanding Customer Preference Factors In Agile - A Research Plan, David Bishop, Pam Rowland Jan 2018

Toward Understanding Customer Preference Factors In Agile - A Research Plan, David Bishop, Pam Rowland

Research & Publications

Our research plan is designed to discover factors that influence, positively or negatively, customer’s preference for agile software development. We will employ qualitative research techniques, specifically grounded theory, as our research method. Customers are an essential component of the agile approach and merit additional study on their preference for software projects developed using agile techniques. The results of our research will present emergent constructs that influence customer preference for agile development. These constructs can then be analyzed using quantitative techniques to assess their validity and understand their relationships.

Go to article

How Ecs Improve Creative Use Of Employees’ Knowledge?, Vetrivadivel Vel, Insu Park Jan 2018

How Ecs Improve Creative Use Of Employees’ Knowledge?, Vetrivadivel Vel, Insu Park

Research & Publications

Recently, organizations are using crowdsourcing systems (CSs) to collect innovative ideas from their employees harnessing their insights of companies’ products, processes, customers, and competitors. While crowd workers in third-party CSs are a diverse and multifaceted population with a range of motives and experience, and yet few researchers have grappled with the facilitators of the employees’ behavior comprising the creative application of their knowledge using enterprise CSs. This study develops a theoretical framework to identify enterprise CSs role and to provide the way how CSs are related to creative behavior via knowledge sharing. In this research, we used a survey to …

Go to article

It For Diabetes Self-Management - What Are The Patients' Expectations?, Omar El-Gayar, Tareq Nasralah, Ahmed Elnoshokaty Jan 2018

It For Diabetes Self-Management - What Are The Patients' Expectations?, Omar El-Gayar, Tareq Nasralah, Ahmed Elnoshokaty

Research & Publications

Diabetes is a debilitating chronic condition that is touted to inflict 9% of adults. Despite the information technology (IT) solutions for the self-management of diabetes, there is a gap between user expectations, and what the IT solutions are offering. To understand these expectations, this research investigates the topics shared by a diabetic community on Twitter as an instant day-to-day micro-blogging platform and TuDiabetes as a social media forum for the community. We focus on studying personal experiences related to diabetes through adapt and apply text mining techniques to tweets of self-identified diabetic patients on Twitter and TuDiabetes. Through the analysis …

Go to article

2018 Weed Science Research Report – Green Section, Ndsu Weed Science, Dept. Of Plant Sciences Jan 2018

2018 Weed Science Research Report – Green Section, Ndsu Weed Science, Dept. Of Plant Sciences

Plant Sciences Weed Science Reports

The Weed Science team at North Dakota State University conduct field research in the State of North Dakota. This specific document reports on field research conducted in 2018. It includes work on small grains and the management of several weeds in North Dakota.

Go to article

2018 Weed Science Research Report – Blue Section, Ndsu Weed Science, Dept. Of Plant Sciences Jan 2018

2018 Weed Science Research Report – Blue Section, Ndsu Weed Science, Dept. Of Plant Sciences

Plant Sciences Weed Science Reports

The Weed Science team at North Dakota State University conduct field research in the State of North Dakota. This specific document reports on field research conducted in 2018. It includes work on corn, soybean and the management of several weeds in North Dakota.

Go to article

2018 Weed Science Research Report – Pink Section, Ndsu Weed Science, Dept. Of Plant Sciences Jan 2018

2018 Weed Science Research Report – Pink Section, Ndsu Weed Science, Dept. Of Plant Sciences

Plant Sciences Weed Science Reports

The Weed Science team at North Dakota State University conduct field research in the State of North Dakota. This specific document reports on field research conducted in 2018. It includes work on the effects of droplet size on Canada thistle control in North Dakota.

Go to article

2018 Weed Science Research Report – Gold Section, Ndsu Weed Science, Dept. Of Plant Sciences Jan 2018

2018 Weed Science Research Report – Gold Section, Ndsu Weed Science, Dept. Of Plant Sciences

Plant Sciences Weed Science Reports

The Weed Science team at North Dakota State University conduct field research in the State of North Dakota. This specific document reports on field research conducted in 2018. It includes work on sugarbeet and the management of several weeds in North Dakota.

Go to article

2018 Weed Science Research Report - Tan Section, Ndsu Weed Science, Dept. Of Plant Sciences Jan 2018

2018 Weed Science Research Report - Tan Section, Ndsu Weed Science, Dept. Of Plant Sciences

Plant Sciences Weed Science Reports

The Weed Science team at North Dakota State University conduct field research in the State of North Dakota. This specific document reports on field research conducted in 2018. It includes work on adjuvants and the management of several weeds in North Dakota.

Go to article

Non-Ionic Iodinated Contrast-Induced Sialadenitis With Parotid Gland Sparing In Patient Of Hepatocellular Carcinoma, Muhammad Azeemuddin, Mustafa Belal Hafeez Chaudhry, Jehanzeb Shahid, Sarosh Zafar Belal Jan 2018

Non-Ionic Iodinated Contrast-Induced Sialadenitis With Parotid Gland Sparing In Patient Of Hepatocellular Carcinoma, Muhammad Azeemuddin, Mustafa Belal Hafeez Chaudhry, Jehanzeb Shahid, Sarosh Zafar Belal

Department of Radiology

61-years-old male patient presented with complain of neck swelling and soreness following contrast-enhanced (CE) CT examination with resolution of symptoms in 36-48 hours. He is diagnosed with hepatitis C virus and hepatocellular carcinoma (HCC); already treated with radiofrequency ablation for HCC. He had already undergone two CECT examinations before he was referred to our institution for disease staging/treatment. He also underwent three triphasic CT scan examinations at our institution during the course of treatment for treatment response and staging. Patient remained undiagnosed up to his fourth CT scan due to inability to relate symptoms with contrast administration. The patient was …

Go to article

After Suffrage Comes Equal Rights? Era As The Next Logical Step, Tracy Thomas, Tracey Jean Boisseau Jan 2018

After Suffrage Comes Equal Rights? Era As The Next Logical Step, Tracy Thomas, Tracey Jean Boisseau

Con Law Center Articles and Publications

No abstract provided.

Go to article

Relationship Between New Farming Practices And Chemical Use And The Consumption Of Giant Cricket (Brachytrupes Membranaceus Drury, 1770), F. O. Miantsia, F. Meutchieye, S. Niassy Jan 2018

Relationship Between New Farming Practices And Chemical Use And The Consumption Of Giant Cricket (Brachytrupes Membranaceus Drury, 1770), F. O. Miantsia, F. Meutchieye, S. Niassy

All Peer-Reviewed Publications

The current work is aimed at generating information on giant crickets and the impact of commonly used pesticides on the natural population of these crickets. Data was collected based on interviews and complemented with field observations. Out of 319 respondents surveyed, 290 were aware of the use of the giant cricket as a food source, and 161 were active consumers. Regarding the availability of the giant cricket, respondents reported that the crickets' populations were diminishing because of farming practices. About 219 persons reported that commonly used herbicides harm giant crickets at different stages. This could be attributed to the scarcity …

Go to article

The Fall Armyworm Endemic: Contriving The Perspicacity In The Outbreak Of Fall Armyworm (Spodoptera Frugiperda) In Relation To Push-Pull Technology, Nicholas O. Ogot Jan 2018

The Fall Armyworm Endemic: Contriving The Perspicacity In The Outbreak Of Fall Armyworm (Spodoptera Frugiperda) In Relation To Push-Pull Technology, Nicholas O. Ogot

All Peer-Reviewed Publications

Fall armyworm (FAW) is a moth native to tropical and subtropical regions of the Americas whose larva causes damage to crops. As of May 23, 2017 it has affected more than 143,000 hectares of land in major maize- and wheat-producing counties in Kenya. In response to its severity, this study was conducted to determine the perception of farmers in respect to; the challenges they faced through FAW endemic; the differences depicted between FAW and stemborers; and strategies farmers apply to attempt controlling them. This study was descriptive, and it was conducted in Homabay and Migori using a sample size of …

Go to article

Diapause Disruption In Cirina Butyrospermi Vuillet (Lepidoptera, Attacidae), The Shea Caterpillar, In Burkina Faso, H. B. Bama, R. A. Dabire, D. Ouattara, S. Niassy, M. N. Ba, D. Dakouo Jan 2018

Diapause Disruption In Cirina Butyrospermi Vuillet (Lepidoptera, Attacidae), The Shea Caterpillar, In Burkina Faso, H. B. Bama, R. A. Dabire, D. Ouattara, S. Niassy, M. N. Ba, D. Dakouo

All Peer-Reviewed Publications

The shea caterpillar Cirina butyrospermi is an important insect, highly valued as a human food item in Burkina Faso. However, its appearance is seasonal due to its univoltine cycle. This study therefore investigated the possibilities of breaking the nymphal diapause by changing the environmental factors and through the hormonal treatment of prepupae and pupae using bovine insulin and 20-hydroxyecdysone. Changes in humidity and temperature did not result in emergence, suggesting a mandatory nature of the diapause in C. butyrospermi. Injection of 20-hydroxyecdysone between 20 and 40 ng on 20 C. butyrospermi pupae resulted in 15.24 and 47.5% emergence, respectively. The …

Go to article

Endophytic Colonization Of Onions Induces Resistance Against Viruliferous Thrips And Virus Replication, Alexander Mutua Muvea, Sevgan Subramanian, Nguya Kalemba Maniania, Hans Michael Poehling, Sunday Ekesi, Rainer Meyhöfer Jan 2018

Endophytic Colonization Of Onions Induces Resistance Against Viruliferous Thrips And Virus Replication, Alexander Mutua Muvea, Sevgan Subramanian, Nguya Kalemba Maniania, Hans Michael Poehling, Sunday Ekesi, Rainer Meyhöfer

All Peer-Reviewed Publications

In agricultural ecosystems, insect pests, pathogens, weather patterns, and reduced soil fertility pose major challenges to crop productivity and are responsible for significant yield losses worldwide. Iris yellow spot virus (IYSV) vectored by Thrips tabaci Lindeman, is a major hindrance to onion production in eastern Africa. Control measures often rely on insecticides with deleterious effects. Endophytes are one key alternative as they can play important roles in mediating induced systemic resistance. Hence, we examined the potential effect of endophytic fungus Hypocrea lixii (F3ST1) on feeding and replication of IYSV on endophyte-colonized (E+) and endophyte-free (E-) onion plants. For more precise …

Go to article

Push-Pull Farming System Controls Fall Armyworm: Lessons From Africa, Zeyaur R. Khan, Jimmy O. Pittchar, Charles A.O. Midega, John A. Pickett Jan 2018

Push-Pull Farming System Controls Fall Armyworm: Lessons From Africa, Zeyaur R. Khan, Jimmy O. Pittchar, Charles A.O. Midega, John A. Pickett

All Peer-Reviewed Publications

Fall armyworm (FAW) Spodoptera frugiperda invaded Africa, with the first detections being reported in Central and Western Africa in early 2016, and now affects at least 40 countries in Africa, causing up to total crop loss amounting to over $6.2 billion p.a. FAW is an invasive polyphagous pest that causes damage to economically important crops and has recently been reported in the Indian sub-continent. Effective control of FAW through use of synthetic chemical pesticides and genetically modified crops such as Bt maize faces challenges including improper use, unaffordability by smallholder farmers and development of resistance by the pest. Additionally, dispersal …

Go to article

Farmers’ Perception And Control Practices Against The Invasive Red Spider Mite (Tetranychus Evansi Baker & Pritchard) In Benin, G. Y. Azandémè-Hounmalon, H. D. Affognon, F. Assogba-Komlan, M. Tamò, K. K.M. Fiaboe, S. Kreiter, T. Martin Jan 2018

Farmers’ Perception And Control Practices Against The Invasive Red Spider Mite (Tetranychus Evansi Baker & Pritchard) In Benin, G. Y. Azandémè-Hounmalon, H. D. Affognon, F. Assogba-Komlan, M. Tamò, K. K.M. Fiaboe, S. Kreiter, T. Martin

All Peer-Reviewed Publications

Tetranychus evansi (Acari: Tetranychidae), is an important pest of solanaceous plants in Benin where it damages tomato (Solanum lycopersicum L.; Solanaceae), African eggplant (S. macrocarpon L.; Solanaceae), purple amaranth (Amaranthus cruentus L.; Amaranthaceae). The objective of the present study was to evaluate the intensity of T. evansi damage and impact of farmers’ control practices in Benin. Two surveys were conducted between 2013 and 2016. The first survey revealed Tetranychus evansi as the only mite, causing production losses of 65% for African eggplant, 56% for tomato and 25% for purple amaranth. To protect the infested crops, growers sprayed various synthetic pesticides …

Go to article

Enzymatic Activity Of Endophytic Bacterial Isolates From Selected Mangrove Plants In Kenya, Regina M. Ntabo, Anthony Kebira Nyamache, Wilber Lwande, James Kabii, James Nonoh Jan 2018

Enzymatic Activity Of Endophytic Bacterial Isolates From Selected Mangrove Plants In Kenya, Regina M. Ntabo, Anthony Kebira Nyamache, Wilber Lwande, James Kabii, James Nonoh

All Peer-Reviewed Publications

Introduction: Microorganisms are a preferred source of enzyme production due to their high production capability and low cost of production. Bacterial endophytes occupy unexplored sites hence they represent a new source of enzymes with diverse applications. Mangrove plants in Kenya have traditionally been used as medicinal plants due to their bioactive metabolites. However the enzymatic activity of mangrove plants associated endophytes has not been studied. Aims & Objectives: The study is aimed at bioprospecting for enzymes with potential biotechnological applications from mangrove ecosystems. Methods & Materials: Forty-two bacterial isolates were cultured and isolated from the leaves and roots of six …

Go to article

Influence Of Prolonged Dietary Experience During The Larval Stage On Novel Odour Preferences In Adults Of Noctuid Stem Borer Moths (Lepidoptera: Noctuidae), Christophe Petit, Peter Ahuya, Bruno Le Ru, Laure Kaiser-Arnauld, Myriam Harry, Paul André Calatayud Jan 2018

Influence Of Prolonged Dietary Experience During The Larval Stage On Novel Odour Preferences In Adults Of Noctuid Stem Borer Moths (Lepidoptera: Noctuidae), Christophe Petit, Peter Ahuya, Bruno Le Ru, Laure Kaiser-Arnauld, Myriam Harry, Paul André Calatayud

All Peer-Reviewed Publications

In Lepidoptera, larval dietary experience of volatile cues can induce adult preference for these cues. However, such induction may require several generations, depending in part on the degree of specialization of the insects. In a previous study, using species of noctuid stem borers with different diet breadths, namely the polyphagous Sesamia nonagrioides, the oligophagous Busseola fusca and monophagous Busseola nairobica, it was shown that in S. nonagrioides, one generation was enough to induce a preference for vanillin in the resulting gravid females, whereas even two generations failed to induce a response in adults of Busseola spp. In this study, we …

Go to article

Lepidopteran Stem Borer Species Abundance And Associated Damages On Irrigated Kilombero Low Land Rice Ecosystem In Tanzania, Bonaventure January, Gration M. Rwegasira, Tadele Tefera Jan 2018

Lepidopteran Stem Borer Species Abundance And Associated Damages On Irrigated Kilombero Low Land Rice Ecosystem In Tanzania, Bonaventure January, Gration M. Rwegasira, Tadele Tefera

All Peer-Reviewed Publications

Background: Rice stem borers are among the most biotic stresses of economic importance in agriculture. Little was known about stem borer problem in Tanzania prior to this study. Understanding stem borer abundance and damages would help to design appropriate stem borer integrated pest management strategy in rice. This study was aimed at investigating rice stem borer’s species abundance and their associated damages in irrigated lowland rice ecosystem in Kilombero Tanzania. Materials and Methods: Field survey study on rice stem borer abundance and incidences were conducted in farmer’s fields on selected rice varieties at varied growth stages in Kilombero district under …

Go to article

Haematology Of N’Dama And West African Shorthorn Cattle Herds Under Natural Trypanosoma Vivax Challenge In Ghana, Ebenezer Yaw Ganyo, Johnson N. Boampong, Daniel K. Masiga, Jandouwe Villinger, Paa Kobina Turkson Jan 2018

Haematology Of N’Dama And West African Shorthorn Cattle Herds Under Natural Trypanosoma Vivax Challenge In Ghana, Ebenezer Yaw Ganyo, Johnson N. Boampong, Daniel K. Masiga, Jandouwe Villinger, Paa Kobina Turkson

All Peer-Reviewed Publications

Background: Animal trypanosomosis is a major cause of economic loss in livestock production in Africa. A suggested control measure is to use breeds with traits of trypanotolerance. The study examines the effect of natural Trypanosoma vivax challenge on haematological parameters in two trypanotolerant cattle [N’Dama and West African Shorthorn (WASH)] herds. Methods: Trypanosoma vivax-specific primers were used to diagnose T. vivax infection in an N’Dama herd at Cape Coast in southern Ghana and a WASH herd at Chegbani in northern Ghana from May to July 2011 in a cross-sectional study. Levels of haematological parameters comprising packed cell volume (PCV), haemoglobin …

Go to article

Genotypic Responses Of Brachiaria Grass (Brachiaria Spp.) Accessions To Drought Stress, Duncan Cheruiyot, Charles Aura Odhiambo Midega, Johnnie Van Den Berg, John Anthony Pickett, Zeyaur Rahman Khan Jan 2018

Genotypic Responses Of Brachiaria Grass (Brachiaria Spp.) Accessions To Drought Stress, Duncan Cheruiyot, Charles Aura Odhiambo Midega, Johnnie Van Den Berg, John Anthony Pickett, Zeyaur Rahman Khan

All Peer-Reviewed Publications

Background and Objective: Brachiaria, a warm season C4 grass, is rapidly gaining popularity as fodder crop in Africa where it is also used as a component of a habitat management strategy for maize stem borers. However, increasing drought limits productivity of this grass species. The aim of this study was to evaluate and select high yielding brachiaria genotypes under simulated drought conditions. Materials and Methods: The morphological and physiological performance of 18 apomictic accessions of brachiaria in simulated drought conditions in a screen house were evaluated. Plants were exposed to different watering regimes. Well-watered (control) plants were watered every 48 …

Go to article

Physico-Chemical Properties Of Extruded Aquafeed Pellets Containing Black Soldier Fly (Hermetia Illucens) Larvae And Adult Cricket (Acheta Domesticus) Meals, F. G. Irungu, C. M. Mutungi, A. K. Faraj, H. Affognon, N. Kibet, C. Tanga, S. Ekesi, D. Nakimbugwe, K. K.M. Fiaboe Jan 2018

Physico-Chemical Properties Of Extruded Aquafeed Pellets Containing Black Soldier Fly (Hermetia Illucens) Larvae And Adult Cricket (Acheta Domesticus) Meals, F. G. Irungu, C. M. Mutungi, A. K. Faraj, H. Affognon, N. Kibet, C. Tanga, S. Ekesi, D. Nakimbugwe, K. K.M. Fiaboe

All Peer-Reviewed Publications

Fish farming is faced with the challenge of high cost of feeds because of the cost of high quality protein needed for formulation of the feeds. Thus, there is urgent need for alternative protein sources. The effects of substituting freshwater shrimp meal (FWSM) with black soldier fly larvae meal (BSFM) or adult cricket meal (ACM) on physico-chemical properties of hot-extruded fish feed pellets were investigated. The FWSM protein in a 26 g/100 g protein fish feed formulation was substituted at 0, 25, 50 and 75%, and moisture content of the formulated blends adjusted to 10, 20 or 30 g/100 g …

Go to article

Risk Assessment And Spread Of The Potentially Invasive Ceratitis Rosa Karsch And Ceratitis Quilicii De Meyer, Mwatawala & Virgilio Sp. Nov. Using Life-Cycle Simulation Models: Implications For Phytosanitary Measures And Management, Chrysantus Mbi Tanga, Fathiya Mbarak Khamis, Henri E.Z. Tonnang, Ivan Rwomushana, Gladys Mosomtai, Samira A. Mohamed, Sunday Ekesi Jan 2018

Risk Assessment And Spread Of The Potentially Invasive Ceratitis Rosa Karsch And Ceratitis Quilicii De Meyer, Mwatawala & Virgilio Sp. Nov. Using Life-Cycle Simulation Models: Implications For Phytosanitary Measures And Management, Chrysantus Mbi Tanga, Fathiya Mbarak Khamis, Henri E.Z. Tonnang, Ivan Rwomushana, Gladys Mosomtai, Samira A. Mohamed, Sunday Ekesi

All Peer-Reviewed Publications

Integrative taxonomy has resolved the species status of the potentially invasive Ceratitis rosa Karsch into two separate species with distinct ecological requirements: C. rosa “lowland type” and the newly described species Ceratitis quilicii De Meyer, Mwatawala & Virgilio sp. nov. “highland type”. Both species are tephritid pests threatening the production of horticultural crops in Africa and beyond. Studies were carried out by constructing thermal reaction norms for each life stage of both species at constant and fluctuating temperatures. Nonlinear functions were fitted to continuously model species development, mortality, longevity and oviposition to establish phenology models that were stochastically simulated to …

Go to article

New Bone Cell Type Identified As Driver Of Drug Resistance In Multiple Myeloma: The Bone Marrow Adipocyte, Carolyne Falank, Heather Fairfield, Mariah Farrell, Michaela Reagan Jan 2018

New Bone Cell Type Identified As Driver Of Drug Resistance In Multiple Myeloma: The Bone Marrow Adipocyte, Carolyne Falank, Heather Fairfield, Mariah Farrell, Michaela Reagan

MaineHealth Maine Medical Center

Multiple myeloma (MM) is a hematological malignancy that is characterized by clonal proliferation of transformed plasma cells within the bone marrow (BM) and severe bone disease. Although MM cells are initially sensitive to many therapies, patients eventually relapse with refractory disease. Because MM cells show a dependency on the BM microenvironment for survival and proliferation, and BM adipocytes (BMAs) demonstrate a unique, endocrine signaling capacity and lipid composition, it is likely that there is cross-talk between MM cells and BMAs that leads to tumor support. Unlike the influences of osteoblasts and osteoclasts, the effect of BMAs on MM cells is …

Go to article

Hollow Core Fiber Based Interferometer For High Temperature (1000 °C) Measurement, Dejun Liu, Qiang Wu, Chao Mei, Jinhui Yuan, Xiangjun Xin, Arun Mallik, Fangfang Wei, Wei Han, Rahul Kumar, Chongxiu Yu, Shengpeng Wan, Xingdao He, Bo Liu, Gang-Ding Peng, Yuliya Semenova, Gerald Farrell Jan 2018

Hollow Core Fiber Based Interferometer For High Temperature (1000 °C) Measurement, Dejun Liu, Qiang Wu, Chao Mei, Jinhui Yuan, Xiangjun Xin, Arun Mallik, Fangfang Wei, Wei Han, Rahul Kumar, Chongxiu Yu, Shengpeng Wan, Xingdao He, Bo Liu, Gang-Ding Peng, Yuliya Semenova, Gerald Farrell

Articles

A simple, cost effective high temperature sensor (up to 1000 °C) based on a hollow core fiber (HCF) structure is reported. It is configured by fusion splicing a short section of HCF with a length of few millimeters between two standard single mode fibers (SMF-28). Due to multiple beam interference introduced by the cladding of the HCF, periodic transmission dips with high spectral extinction ratio and high quality (Q) factor are excited. However, theoretical analysis shows that minor variations of the HCF cladding diameter may result in a significant decrease in the Q factor. Experimental results demonstrate that the position …

Go to article

Measurements Of Milli-Newton Surface Tension Forces With Tilted Fiber Bragg Gratings, Changyu Shen, Chuan Zhong, Dejun Liu, Xiokang Lian, Jianyao Zheng, Jingjing Wang, Yuliya Semenova, Gerald Farrell, Jacques Albert, John F. Donegan Jan 2018

Measurements Of Milli-Newton Surface Tension Forces With Tilted Fiber Bragg Gratings, Changyu Shen, Chuan Zhong, Dejun Liu, Xiokang Lian, Jianyao Zheng, Jingjing Wang, Yuliya Semenova, Gerald Farrell, Jacques Albert, John F. Donegan

Articles

Small lateral forces (lower than 0.1 N) cannot normally be measured with conventional single-mode fiber-based sensors because of the high value of their Young modulus (>70 GPa). Here we demonstrate the measurement of lateral forces in the range from 0.2 to 1.4 × 10−3 N with a tilted fiber Bragg grating (TFBG) in conventional single-mode fiber pushed against the surface tension (ST) of a bead of water. The measured transmission changes of individual cladding mode resonances of the TFBG corresponding to these force values are of the order of 29 dB. Separate measurements of the contact angle between the …

Go to article

Optical Fibre Sensors For Monitoring Phase Transitions In Phase Changing Materials, Rahul Kumar, Wei Han, Dejun Liu, W. P. Ng, Binns, Richard Binns, Richard, Krishna K. Busawon, Yong Qing Fu, Zabih Ghassemlooy, Chris P. Underwood, Khamid Kh Mahkamov, Jinhui Yuan, Chongxiu Yu, Huazhong Shu, Xing Ao Li, Tuan Guo, Gerald Farrell, Yuliya Semenova, Qiang Wu Jan 2018

Optical Fibre Sensors For Monitoring Phase Transitions In Phase Changing Materials, Rahul Kumar, Wei Han, Dejun Liu, W. P. Ng, Binns, Richard Binns, Richard, Krishna K. Busawon, Yong Qing Fu, Zabih Ghassemlooy, Chris P. Underwood, Khamid Kh Mahkamov, Jinhui Yuan, Chongxiu Yu, Huazhong Shu, Xing Ao Li, Tuan Guo, Gerald Farrell, Yuliya Semenova, Qiang Wu

Articles

A platinum coated singlemode-multimode (SM) structure is investigated in this paper as an optical fibre sensor (OFS) to monitor the phase transition of a phase change material (PCM). Paraffin wax has been used as an example to demonstrate the sensor's performance and operation. Most materials have the same temperature but different thermal energy levels during the phase change process, therefore, sole dependency on temperature measurement may lead to an incorrect estimation of the stored energy in PCM. The output spectrum of the reflected light from the OFS is very sensitive to the bend introduced by the PCM where both liquid …

Go to article

A Comprehensive Experimental Study Of Whispering Gallery Modes In A Cylindrical Micro-Resonator Excited By A Tilted Fiber Taper, Vishnu Kavungal, Gerald Farrell, Qiang Wu, Arun Mallik, Yuliya Semenova Jan 2018

A Comprehensive Experimental Study Of Whispering Gallery Modes In A Cylindrical Micro-Resonator Excited By A Tilted Fiber Taper, Vishnu Kavungal, Gerald Farrell, Qiang Wu, Arun Mallik, Yuliya Semenova

Articles

Whispering gallery modes (WGMs) excitation in a cylindrical microresonator formed by a section of silica optical fiber has been studied. Evanescent light coupling into the microresonator is realized using a tapered optical fiber, fabricated by a microheater brushing technique. Several types of silica fibers with different diameters are studied as microresonators, and the influence of the resonator's diameter on the excitation of WGMs is investigated. The excitation of WGMs in a cylindrical fiber resonator were studied with changes to the tilt angle between the microcylinder and the fiber taper in the range of angles from a perpendicular position (0 degrees) …

Go to article

First Prev Next Last