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The influence of spark plasma sintering temperatures on the microstructure,hardness,and elastic modulus of the nanocrystalline Al-xV alloys produced by high-energy ball milling

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Journal of Materials Science & Technology 2022年第27期122卷 68-76页

作者： J.Christudasjustus C.S.Witharamage Ganesh Walunj T.Borkar R.k.Gupta Department of Materials Science and Engineering North Carolina State UniversityRaleighNC 27606United States Department of Mechanical Engineering Cleveland State UniversityClevelandOH 44115United States

Al-xV alloys(x=2 at.%,5 at.%,10 at.%)with nanocrystalline structure and high solid solubility of V were produced in powder form by high-energy ball milling(HEBM).The alloy powders were consolidated by spark plasma sintering(SPS)employing a wide range of temperatures ranging from 200 to 400°*** microstructure and solid solubility of V in Al were investigated using X-ray diffraction analysis,scanning electron microscope and transmission electron *** microstructure was influenced by the SPS temperature and V content of the *** alloys exhibited high solid solubility of V–six orders of magnitude higher than that in equilibrium state and grain size<50 nm at all the SPS *** formation of Al3V intermetallic was detected at 400℃.Formation of a V-lean phase and bimodal grain size was observed during SPS,which increased with the increase in SPS *** hardness and elastic modulus,measured using nanoindentation,were significantly higher than commercial *** example,Al-V alloy produced by SPS at 200℃ exhibited a hardness of 5.21 GPa along with elastic modulus of 96.21 *** evolution of the microstructure and hardness with SPS temperatures has been discussed.

关键词： Spark plasma sintering Aluminum alloys Nanocrystalline alloys High-energy ball milling Nanoindentation Hardness Elastic modulus

Reinforced tissue matrix to strengthen the abdominal wall following reversal of temporary ostomies or to treat incisional hernias

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World Journal of Gastrointestinal Surgery 2024年第3期16卷 823-832页

作者： Spencer P Lake Corey R Deeken Amit k Agarwal Mechanical Engineering&Materials Science Washington University in St.LouisSt.LouisMO 63130United States Covalent Bio LLCSt.LouisMO 63025United States Department of Surgery McGovern Medical School at UTHealthHoustonTX 77026United States

BACkGROUND Abdominal wall deficiencies or weakness are a common complication of tem-porary ostomies,and incisional hernias frequently develop after colostomy or ileostomy *** use of synthetic meshes to reinforce the abdominal wall has reduced hernia *** meshes have also been used to enhance healing,particularly in contaminated *** tissue matrices(R-TMs),which include a biologic scaffold of native extracellular matrix and a syn-thetic component for added strength/durability,are designed to take advantage of aspects of both synthetic and biologic *** date,RTMs have not been reported to reinforce the abdominal wall following stoma *** Twenty-eight patients were selected with a parastomal and/or incisional hernia who had received a temporary ileostomy or colostomy for fecal diversion after rectal cancer treatment or *** hernia repair and proximal stoma closure,RTM(OviTex®1S permanent or OviTex®LPR)was placed to reinforce the abdominal wall using a laparoscopic,robotic,or open surgical ***-operative follow-up was performed at 1 month and 1 *** recurrence was determined by physical examination and,when necessary,via computed tomo-graphy *** endpoints included length of hospital stay,time to return to work,and hospital *** complications of the wound/repair site included presence of surgical site infection,seroma,hematoma,wound dehiscence,or fistula *** The observational study cohort included 16 male and 12 female patients with average age of 58.5 years±16.3 years and average body mass index of 26.2 kg/m^(2)±4.1 kg/m^(2).Patients presented with a parastomal hernia(75.0%),in-cisional hernia(14.3%),or combined parastomal/incisional hernia(10.7%).Using a laparoscopic(53.6%),robotic(35.7%),or open(10.7%)technique,RTMs(OviTex®LPR:82.1%,OviTex®1S:17.9%)were placed using sublay(82.1%)or intraperitoneal onlay(IPOM;17.9%)mesh *** 1-mo

关键词： Reinforced tissue matrix Reinforced forestomach matrix Ileostomy Colostomy Ostomy takedown Incisional hernia Abdominal wall

Anti-listerial synergism of leaf essential oil of Metasequoia glyptostroboides with nisin in whole,low and skim milks

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Asian Pacific Journal of Tropical Medicine 2014年第8期7卷 602-608页

作者： Vivek k.Bajpai Jung In Yoon Monika Bhardwaj Sun Chul kang Department of Applied Microbiology and Biotechnology Yeungnam UniversityGyeongsanGyeongbuk 712-749Republic of Korea Department of Biotechnology Daegu UniversityGyeongsanGyeongbuk 712-714Republic of Korea

Objective:To examine the individual and synergistic anti-listcrial effect of nisin and leaf essential oil of Metasequoia glyptostroboides(***) against one of the leading foodhorne pathogens Listeria monocytogenes(***) ATCC 19116 in milk ***:The whole(8%),low(1%) and skim(no fat content) milk samples were inoculated with *** ATCC 19116 along with leaf essential oil of *** or nisin alone as well in ***:In this study,the leaf essential oil at the concentrations of 2% and 5% revealed strong anti-listerial effect against *** ATCC 19116 in all categories of milk *** at the concentrations of 250 and 500 IU/mL displayed a strong inhibitory effect against ATCC 19116 as compared to the control ***,synergistic combinations of leaf essential oil(1%) and nisin(62.5,125.250 and 500 IU/mL) also had a remarkable anti-listerial synergism in all the tested milk samples including whole,low and skim milk after 14 ***:As a major finding,the leaf essential oil of *** might he a useful candidate for using in food industry to control the growth of foodhorne pathogenic bacteria as confirmed by its potent anti-listerial Synergistic effect with nisin against *** ATCC 19116 in different milk samples.

关键词： Anti-listerial effect Synergism Metasequoia glyptostroboides Leaf essential oil Nisin,Milk samples

A Price-elastic Approach for Optimal Scheduling of Small-scale Storage Devices in Smart Houses with Short-term and Long-term Constraints

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Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 163-169页

作者： kürşat Tanriöven Ferhat Daldaban Mahmut Erkut Cebeci Osman Bülent Tör Saeed Teimourzadeh kayseri Electric Distribution Co. KayseriTurkey Erciyes University KayseriTurkey EPRA Electric Energy AnkaraTurkey

Consecutive charging and discharging of storage devices(SDs)might deem beneficial from the perspective of short-term ***,it highly impacts the life span of the embedded battery and render restrictions on energy storage *** investigate short-term and long-term constraints of SDs through a three-stage price-elastic approach to the optimal operation of small-scale SDs in smart *** first stage deals with data and scenario characterization where the data for determining short-term and long-term operation constraints of SD are *** number of scenarios are generated to represent uncertain parameters such as long-term demand forecasting,daily load profile,electricity price,and photovoltaic(PV)*** second stage optimizes the long-term operation of SD using the envisioned scenarios subject to the long-term operation constraints and the installment costs of *** outputs of this stage are two indicators referred to as price elasticity and price offset coefficients,which are used as the inputs for the third *** third stage is responsible for decision-making on short-term operation of *** outputs of the second stage along with short-term forecasting for daily electricity price,daily load and daily PV generation are *** on the acquired data,proper price elasticity and price offset are determined for optimal *** simulations are performed for different demand forecasting and electricity *** results confirm the effectiveness of the proposed approach.

关键词： Storage device depth-of-discharge life span smart house

ASSESSMENT OF AIR CHANGE EFFECTIVENESS AND THERMAL COMFORT IN A NATURALLY VENTILATED kITCHEN WITH INSECT-PROOF SCREEN USING CFD

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Journal of Green Building 2021年第3期16卷 37-56页

作者： Jayasree T k Jinshah B S Lakshmi Visakha V Srinivas Tadepalli Department of Architecture National Institute of TechnologyTiruchirappalliIndia Department of Mechanical Engineering National Institute of TechnologyTiruchirappalliIndia

Many dwellings in warm-humid climates attain a comfortable environment by natural *** opening of exterior windows for ventilation allows the entry of insects along with the *** a remedy,occupants install insect-proof screens on windows resulting in reduced airflow into the *** study attempts to evaluate the air change effectiveness and thermal comfort in a residential kitchen with insect-proof screens.A kitchen with insect-proof screens on the windows is compared with a case without insect-proof *** simulation was conducted using ANSYS Fluent 2019 *** insect-proof screen is modelled as a porous *** air velocity and temperature measurements were validated by measurements in a real *** presence of insect-proof screens reduced the air velocity inside the space by 82%.However,the airflow pattern in the case with screens was more uniformly *** mean age of the air was considerably higher in the case with insect-proof screens,which in turn resulted in a reduced *** presence of an insect-proof screen resulted in a Predicted Mean Vote(PMV)of 2.79 indicating a‘hot’sensation,whereas in the other case,the comfort vote is only 1.93 indicating a‘warm’*** presence of insect-proof screens on windows reduced the air velocity and ventilation efficiency,contributing to increased thermal discomfort in the kitchen.

关键词： thermal comfort air change effectiveness insect-proof screen kitchen computational fluid dynamics age of air

Primary pancreatic hydatid disease associated with acute pancreatitis

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Hepatobiliary & Pancreatic Diseases International 2010年第4期9卷 441-442页

作者： karakas E Tuna Y Basar  kklü S Department of Radiology Sanllurfa Education and Research Hospital Sanllurfa Turkey Department of Gastroenterology Akdeniz University Faculty of Medicine Department of Gastroenterology Dlskapl Education and Research Hospital Department of Gastroenterology Ankara Education and Research Hospital

The Editor welcomes submissions for possible publication in the Letters to the Editor section. Letters commenting on an article published in the Journal or other interesting pieces will be considered if they are received within 6 weeks of the time the article was published. Authors of the article being commented on will be given an opportunity to offer a timely response to the letter. Authors of letters will be notified that the letter has been received. Unpublished letters cannot be returned.

关键词： Primary pancreatic hydatid disease associated with acute pancreatitis

Induction motors variable speed drives diagnosis through rotor resistance monitoring

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Frontiers in Energy 2012年第4期6卷 420-426页

作者： k. YAHIA S. ZOUZOU F. BENCHABANE GEB Laboratory Department of Electrical Engineering University ofBiskra BP 145 Biskra Algeria MSE Laboratory Department of Electrical Engineering University ofBiskra BP 145 Biskra Algeria

Induction motor driven by vector control method makes high performance control of torque and speed possible. The decoupling of flux and electromag netic torque obtained by field orientation depends on the precision and the accuracy of the estimated states. Rotor asymmetries lead to perturbations of air gap flux patterns in induction machines. These perturbations in flux compo nents affect the electromagnetic torque, as well as stator currents and voltages. This paper first investigates the control of the induction motor using an extended kalman filter （EkF） for a direct fieldoriented control. It then studies the broken rotor bars （BRBs） fault by the monitoring the rotor resistance. The hypothesis on which the detection is based is that the apparent rotor resistance of the motor will increase when a rotor bar breaks. The rotor resistance is estimated and value to detect BRBs fault. compared with its nominal The EkF estimates the rotor flux, speed and rotor resistance on line by using only measurements of the stator voltages and currents. Simula tion results show the effectiveness of the proposed method in the cases of load torque perturbation and speed reversion.

关键词： induction motor vector control broken rotorbars (BRBs) diagnostic extended kalman filter (EkF)

Land use and land cover changes and Soil erosion in Yezat Watershed,North Western Ethiopia

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International Soil and Water Conservation Research 2017年第2期5卷 85-94页

作者： Lemlem Tadesse k.V.Suryabhagavan G.Sridhar Gizachew Legesse School of Earth Sciences Addis Ababa UniversityP.O.Box 1176Addis AbabaEthiopia International Crops Research Institute for the Semi-Arid Tropics(ICRISAT) P.O.Box 5689Addis AbabaEthiopia

Soil erosion affects land qualities and water *** problem is severe in Ethiopia due to its topographic *** present research was aimed to estimate spatiotemporal changes in land-use/land-cover pattern and soil erosion in the Yezat watershed in *** study was carried out by using landsat imageries of 2001,2010 and *** were classified into categories using supervised classification by maximum likelihood *** were also classified into different biomass levels by using Normalized Difference Vegetation Index(NDVI)*** Universal Soil Loss Equation modeling was applied in a GIS environment to quantify the potential soil erosion *** area under grassland,woodland and homesteads have increased by 610.69(4%),101.69(0.67%)and 126.6 ha(0.83%)during *** extent of cultivated land and shrub/bushland was reduced by 323.43(0.02%)and 515.44 ha(3.41%),respectively,during the same *** vegetation cover in the watershed decreased by 91% during 2001-2010,and increased by 88% during *** of NDVI values indicates better ground cover due to implementation of integrated watershed development program in the *** estimated annual soil losses were 7.2 t ha^(-1) yr^(-1) in 2001,7.7t ha^(-1) yr^(-1) in 2010 and 4.8t ha^(-1) yr^(-1) in *** interventions are necessary to improve the status and utilization of watershed resources in response to sustainable land management practices for sustainable livelihood of the local people.

关键词： Biomass GIS NDVI Land-use and land-cover Remote sensing RUSLE

Surface Pressure and Summer Monsoon Rainfall over India

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Advances in Atmospheric Sciences 1992年第3期9卷 359-366页

作者： B.Parthasarathy k.Rupa kumar A.A.Munot Indian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 India

The relationship between the all-India summer monsoon rainfall and surface pressure over the Indian region has been examined to obtain a useful predictor for the monsoon rainfall. The data series of all-India monsoon rainfall and the mean pressures of three seasons before and after the monsoon season as well as the winter-to-spring pressure tendency (MAM-DJF) at 100 stations for the period 1951-1980 have been used in the *** all-India monsoon rainfall is negatively correlated with the pressure of the spring (MAM) season preceding the monsoon and winter-to-spring seasonal difference as pressure tendency (MAM-DJF), at almost all the stations in India, and significantly with the pressures over central and northwestern regions. The average mean sea level pressure of six stations (Jodhpur, Ahmedabed, Bombay, Indore, Sagar and Akola) in the Western Central Indian (WCI) region showed highly significant (at 1% level) and consistent CCs of-0.63 for MAM and -0.56 for MAM-DJF for the period 1951 - 1980. Thus, the pre-monsoon seasonal pressure anomalies over WCI could provide a useful parameter for the long-range forecasting scheme of the Indian monsoon rainfall.

关键词： over In Surface Pressure and Summer Monsoon Rainfall over India MAM