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1Effect of Y_2O_3 stabilized ZrO_2 coating with tri-model structure on bi-layered thermally grown oxide evolution in nano thermal barrier coating systems at elevated temperatures显示文摘Bi-layered thermally grown oxide(TGO) layer plays a major role in the spallation of Y2 O3 stabilized ZrO2(YSZ) layer form the bond coat in the thermal barrier coating(TBC) systems during oxidation. On the other hand, bi-layered TGO formation and growth in the TBC systems with nanostructured YSZ have not been deeply investigated during cyclic oxidation. Hence, Inconel 738/NiCrAlY/normal YSZ and Inconel 738/NiCrAlY/nano YSZ systems were pre-oxidized at 1000 °C and then subjected to cyclic oxidation at 1150 °C. According to microstructural observations, nanostructured YSZ layer over the bond coat should have less micro-cracks and pinholes, due to the compactness of the nanostructure and the presence of nano zones that resulted in lower O infiltration into the nanothermal barrier coating system, formation of thinner and nearly continuous mono-layered thermally grown oxide on the bond coat during pre-oxidation, lower spinels formation at the Al2 O3 /YSZ interface and finally, reduction of bi-layered thermally grown oxide thickness during cyclic oxidation. It was found that pre-heat treatment and particularly coating microstructure could influence microstructural evolution(bi-layered TGO thickness) and durability of thermal barrier coating systems during cyclic oxidation.Mohammadreza Daroonparvar Muhamad Azizi Mat Yajid Noordin Mohd Yusof Hamid Reza Bakhsheshi-Rad Z.Valefi Esah Hamzah 2014Journal of Rare Earths2014,32,1:10
2新型PEO/纳米结构ZrO_2镁合金涂层的抗菌活性及腐蚀行为(英文)显示文摘为了增强镁合金的耐腐蚀性和抗菌活性,先采用等离子体电解氧化(PEO)在镁合金上制备一层结合层,再用空气等离子喷涂(APS)制备纳米结构ZrO_2表面涂层。采用电化学试验研究涂层样品的腐蚀行为,采用琼脂扩散法对其进行大肠杆菌病原菌抑菌活性评价,并与无涂层样品进行对比。与PEO涂层和无涂层镁合金相比,PEO/纳米ZrO_2涂层样品的腐蚀电流密度最低,电荷传递阻力最高,相位角和阻抗模量最高。PEO结合涂层被纳米ZrO_2表面涂层完全密封,能够显著延缓侵蚀性离子向镁合金表面迁移,显著提高镁合金在模拟体液(SBF)中的耐蚀性。此外,PEO/纳米ZrO_2涂层的抗菌活性也高于PEO涂层和无涂层镁合金,这是由于ZrO_2纳米颗粒通过作用于细胞膜而降低了大肠杆菌的生长速率。Mohammadreza DAROONPARVAR Muhamad Azizi MAT YAJID Rajeev KUMAR GUPTA Noordin MOHD YUSOF Hamid Reza BAKHSHESHI-RAD Hamidreza GHANDVAR Ehsan GHASEMI 2018Transactions of Nonferrous Metals Society of China2018,28,8:10
3Investigation of three steps of hot corrosion process in Y_2O_3 stabilized ZrO_2 coatings including nano zones显示文摘Phase transformation of tetragonal ZrO2 to monoclinic phase and also increment of bond coat oxidation kinetic(TGO thickening) can substantially restrict the life time of thermal barrier coating systems(TBCs). So, nanostructured and conventional Y2O3 stabilized ZrO2 coatings were evaluated in fused V2O5-Na2SO4 salts during thermal exposure in air. Microstructural characterization showed lower hot corrosion products(monoclinic zirconia, YVO4 crystals) formation and reduction of TGO thickness in thermal barrier coating system consisting of nanostructured Y2O3 stabilized ZrO2(YSZ) top coat. It was found that inhomogeneities, pores and micro-cracks played a principal role in the molten salts infiltration into the YSZ coating during three steps of hot corrosion process. In the nanostructured YSZ coating with tri-model structure, nano zones which surrounded by fully molten parts could fill the aforementioned defects and could act as barrier for the oxygen and corrosive molten salts penetration into the TBC.Mohammadreza Daroonparvar Muhamad Azizi Mat Yajid Noordin Mohd Yusof Hamid Reza BakhsheshiRad Esah Hamzah Mohsen Nazoktabar 2014Journal of Rare Earths2014,32,10:10
4Carvedilol vs endoscopic variceal ligation for primary and secondary prevention of variceal bleeding: Systematic review and metaanalysis显示文摘BACKGROUND Variceal hemorrhage is associated with high mortality and is the cause of death for 20–30%of patients with cirrhosis.Nonselectiveβblockers(NSBBs)or endoscopic variceal ligation(EVL)are recommended for primary prevention of variceal bleeding in patients with medium to large esophageal varices.Meanwhile,combination of EVL and NSBBs is the recommended approach for the secondary prevention.Carvedilol has greater efficacy than other NSBBs as it decreases intrahepatic resistance.We hypothesized that there was no difference between carvedilol and EVL intervention for primary and secondary prevention of variceal bleeding in cirrhosis patients.AIM To evaluate the efficacy of carvedilol compared to EVL for primary and secondary prevention of variceal bleeding in cirrhotic patients METHODS We searched relevant literatures in major journal databases(CENTRAL,MEDLINE,and EMBASE)from March to August 2018.Patients with cirrhosis and portal hypertension,regardless of aetiology and severity,with or without a history of variceal bleeding,and aged≥18 years old were included in this review.Only randomized controlled trials(RCTs)that compared the efficacy of carvedilol and that of EVL for primary and secondary prevention of variceal bleeding and mortality in patients with cirrhosis and portal hypertension were considered,irrespective of publication status,year of publication,and language.RESULTS Seven RCTs were included.In four trials assessing the primary prevention,no significant difference was found on the events of variceal bleeding(RR:0.74,95%CI:0.37-1.49),all-cause mortality(RR:1.10,95%CI:0.76-1.58),and bleedingrelated mortality(RR:1.02,95%CI:0.34-3.10)in patients who were treated with carvedilol compared to EVL.In three trials assessing secondary prevention,there was no difference between two interventions for the incidence of rebleeding(RR:1.10,95%CI:0.75-1.61).The fixed-effect model showed that,compared to EVL,carvedilol decreased all-cause mortality by 49%(RR:0.51,95%CI:0.33-0.79),with little or no evidence of heterogeneity.CONCLUSION Carvedilol had similar efficacy to EVL in preventing the first variceal bleeding in cirrhosis patients with esophageal varices.It was superior to EVL alone for secondary prevention of variceal bleeding in regard to all-cause mortality reduction.Michael Dwinata David Dwi Putera Muhamad Fajri Adda’i Putra Nur Hidayat Irsan Hasan 2019World Journal of Hepatology2019,11,5:6
5A novel coordinated control strategy considering power smoothing for a hybrid photovoltaic/battery energy storage system显示文摘This work presents a novel coordinated control strategy of a hybrid photovoltaic/battery energy storage(PV/BES) system. Different controller operation modes are simulated considering normal, high fluctuation and emergency conditions. When the system is grid-connected, BES regulates the fluctuated power output which ensures smooth net injected power from the PV/BES system. In islanded operation, BES system is transferred to single master operation during which the frequency and voltage of the islanded microgrid are regulated at the desired level. PSCAD/EMTDC simulation validates the proposed method and obtained favorable results on power set-point tracking strategies with very small deviations of net output power compared to the power set-point. The state-of-charge regulation scheme also very effective with SOC has been regulated between 32% and 79% range.DAUD Muhamad Zalani MOHAMED Azah HANNAN M A 2016Journal of Central South University2016,23,2:5
6纳米氧化铝作为第三层对热障涂层中热生长氧化物层的改善(英文)显示文摘在热障涂层的顶层与连接层界面之间会生成热生长氧化物层。当涂层热暴露在空气中时,这种热生长氧化物的生长会导致陶瓷层与连接层的剥落。研究了4种大气等离子喷涂热障涂层在空气中的耐高温氧化性能。将这4种涂层放在1000°C的电炉中在空气下分别保温24、48和120h。组织观察表明,在纳米NiCrAlY/YSZ/纳米Al2O3涂层中,热生长氧化物层的生长速率远比其它3种涂层中的低。EDS和XRD分析表明,在热生长氧化物(Al2O3)涂层上,生成了Ni(Cr,Al)2O4混合氧化物(尖晶石型)和NiO,在纳米NiCrAlY/YSZ/纳米Al2O3涂层中,这种生长在Al2O3层上的有害混合氧化物层的厚度比在其它涂层中的低很多。Mohammadreza DAROONPARVAR Muhamad Azizi Mat YAJID Noordin Mohd YUSOF Saeed FAR AHANY Mohammad Sakhawat HUSSAIN Hamid Reza BAKHSHESHIRAD Z.VALEFI Ahmad ABDOLAHI 2013Transactions of Nonferrous Metals Society of China2013,23,5:4
7Antioxidant and cytotoxic activity of Acanthus ilicifolius flower显示文摘Objective:To investigate the antioxidant and cytotoxic activity of the flower of Acanthus ilicifolius(A.ilicifolius).Methods:Antioxidant activity was determined as antiradical efficiency with diphenyl picrylhydrazil(DPPH)method and cytotoxic assay was undertaken using brine shrimp lethal toxicity test.Results:A.ilicifolius flower contained terpenoid,phenolic compounds,and alkaloid.The methanol extract of A.ilicifolius flower showed the highest antiradical efficiency(AE=1.41×10^(-3))against DPPH radicals and the highest cytotoxicity(LC_(50)=22μg/mL)against brine shrimp nauplii.Conclusions:It is suggested that active compounds of A.ilicifolius flower solved in methanol play a role to inhibit free radical activity and kill Artemia salina nauplii.The substances can be considered as potential antioxidant and cytotoxic agents as well as imminent candidate for cancer therapy.Muhamad Firdaus Asep Awaludin Prihanto Rahmi Nurdiani 2013Asian Pacific Journal of Tropical Biomedicine2013,3,1:3
8Assessment of in vitro sensitivity of Plasmodium vivax fresh isolates显示文摘Objective:To compare the applicability of the SYBK Grcen-Ⅰ assay with the standard schizont maturalion assay,for determination of sensitivity of Plasmodium vivax(P.vivax) to chloroquine and a new antifolale WR 99210.Methods:The study was conducted at Mae Tao Clinic for migrant workers,Tak Province during April 2009 to July 2010.A total of 64 blood samples(1 mL blood collected into sodium heparinized plastic tube) were collected from patients with monoinfection with P.vivax malaria prior to treatment with standard regimen of a 3-day chloroquine. In vitro sensitivity of P.vivax isolates was evaluated by schizont maturation inhibition and SYBR Green-Ⅰ assays.Results:A total of 30 out of 64 blood samples collected from patients with P.vivax malaria were successfully analyzed using both the microscopic schizont maturation inhibition and SYBR Green-I assays.The failure rates of the schizont maturation inhibition assay(50%) and the SYBR Green-I assay(54%) were similar(P=0.51).The median IC_(10)s,IC_(50)s and IC_(90)s of both chloroquine and WR99210 were not significantly different from the clinical isolates of P.vivax tested.Based on the cut-off of 100 nM,the prevalences of chloroquine resistance determined by schizont maturation inhibition and SYBR Green-I assays were 19 and 11 isolates,respectively.The strength of agreement between the two methods was very poor for both chloroquine and WR992I0.Conclusions:On the basis of this condition and its superior sensitivity,the microscopic method appears better than the SYUK Green-I Green assay for assessing in vitro sensitivity of fresh P.vivax isolates to antimalarial drugs.Poonuch Muhamad Wanna Chacharoenkul Kanchana Rungsihirunrat Ronnatrai Ruengweerayut Kesara NaBangchang 2011Asian Pacific Journal of Tropical Biomedicine2011,1,1:2
9尿素中添加腐植酸、黄腐酸、重过磷酸钙和氯化钾能抑制氨的挥发显示文摘该试验比较了不同混合物,尿素-重过磷酸钙-氯化钾、尿素-重过磷酸钙-氯化钾-腐植酸、尿素-重过磷酸钙-氯化钾-黄腐酸、尿素-重过磷酸钙-氯化钾-酸性混合物(黄腐酸+腐植酸)在对氨损失,土壤pH值,铵态氮和可利用硝态氮积累等方面的影响,以尿素单独施用作为对照。方法:在实验室条件下,利用一个封闭式动态空气流量系统来评估是否混有重过磷酸钙、氯化钾、腐植酸、黄腐酸的情况下尿素的有效性。氨损失、土壤pH值、土壤中铵态氮以及可利用硝态氮是由标准程序测定的。结果:与对照组(单独施用尿素)相比,处理尿素-重过磷酸钙-氯化钾,尿素-重过磷酸钙-氯化钾-腐植酸,尿素-重过磷酸钙-氯化钾-黄腐酸,尿素-重过磷酸钙-氯化钾-酸性混合物(黄腐酸+腐植酸)中氨损失明显地减少,减少率由12.92%、20.12%、25.94%达到100%,土壤中的铵态氮也有类似的变化。从所有的处理来看,只有尿素-重过磷酸钙-氯化钾-黄腐酸,尿素-重过磷酸钙-氯化钾-酸性混合物(腐植酸+黄腐酸)明显地积累了土壤中可利用硝态氮,这一结果与本研究中pH值的结果一致。结论:尿素、重过磷酸钙、氯化钾中混合腐植酸或者酸性的腐植酸和黄腐酸混合物能够显著减少氨损失。这项研究结果有助于提高尿素中N,P,K使用的有效性,同时减少环境污染。Shamsuddin Rosliza Osumanu Haruna Ahmed Nik Muhamad Ab.Majid 张丽娜 宋丽艳 2010腐植酸2010,,2:2
10有机氮肥对马来西亚沙捞越州酸性土壤玉米干物质产量及铵态氮和硝态氮含量的影响显示文摘腐殖质中的腐植酸和黄腐酸可以提高土壤中可交换性铵(NH4+)的回收率。这两种酸固定和保持NH4+的能力已经在许多研究中得到了证实,二者通过提高植株的光合作用速率、促进根系发育影响植物的生长和养分吸收。因此,本研究调查了这两种酸(液态)对玉米干物质产量、土壤铵态氮和硝态氮(NO3-)含量的影响。根据液态有机氮肥的组成,采用标准方法分离提纯腐植酸。有机氮肥在玉米种植后第10天、第28天分别施入盆栽土壤,然后在种植后第54天或孕穗期采集植株和土壤样品。土壤样品分析pH、铵态氮和硝态氮含量,植株样品测定干物质产量。结果表明,在酸性条件下,液态有机氮肥(黄腐酸、腐植酸或二者同时施用)的施用可以提高土壤中NH4+的累积量。随土壤活性碳储量的增加,腐植酸分子上羧基官能团对土壤NH4+的吸附能力增强。然而,酸含量较低时对干物质产量的影响明显减小。各处理间硝态氮的有效性没有达到统计上的差异显著水平。较低的pH值能抑制土壤硝化作用进程,同时降低土壤NO3-含量。这表明液态腐植酸和/或黄腐酸在提高尿素利用效率方面发挥着重要作用。然而,与腐植酸分子特性有关的作用机理还需要进一步详细研究。本研究为液态和叶面有机肥料的发展提供一定的依据。Susilawati Kasim Osumanu Haruna Ahmed Nik Muhamad Ab.Majid Mohd Khanif Yusop Mohamadu Boyie Jalloh 王艳群 孙志梅 2011腐植酸2011,,2:2
11Graphene-and Multi-Walled Carbon Nanotubes-Coated Tapered Plastic Optical Fiber for Detection of Lard Adulteration in Olive Oil显示文摘A rapid and high-performance sensor for lard adulterant in edible oil was developed using the tapered plastic optical fiber(POF)coated with graphene and multi-walled carbon nanotubes.The coating material was deposited onto a tapered POF with a taper waist diameter and a taper length of 0.45 mm and 1 cm,respectively.The addition of the coating material was used to increase the sensitivity and selectivity coefficient of the tapered POF toward the lard substance.The sensing mechanism is based on a simultaneous interaction of lard substance and an evanescent wave of tapered POF with the coating layers.The results showed that graphene coating on the tapered POF increased the selectivity coefficient of the tapered POF towards lard substance from 33.54 to 324.19,and it gave a sensitivity of 0.427 dBm/%.In comparison,multi-walled carbon nanotubes coating increased the selectivity coefficient to 71.65 and increased its sensitivity to 1.189 dBm/%.Thus,the proposed configuration of the tapered POF with the coating material offered a simple configuration for a rapid,high sensitivity and selectivity detection of lard adulterant in edible oils.Ika PUSPITA Ninik IRAWATI Kartika Anoraga MADURANI Fredy KURNIAWAN Sekartedjo KOENTJORO Agus Muhamad HATTA 2022Photonic Sensors2022,12,4:2
12The Use of Single-Phase Immersion Cooling by Using Two Types of Dielectric Fluid for Data Center Energy Savings显示文摘Data centers are recognized as one of the most important aspects of the fourth industrial revolution since conventional data centers are inefficient and have dependency on high energy consumption,in which the cooling is responsible for 40%of the usage.Therefore,this research proposes the immersion cooling method to solving the high energy consumption of data centers by cooling its component using two types of dielectric fluids.Four stages of experimentalmethods are used,such as fluid types,cooling effectiveness,optimization,and durability.Furthermore,benchmark software is used to measure the CPU maximum work with the temperature data performed for 24 h.The results of this study show that the immersion cooling reduces 13℃ lower temperature than the conventional cooling method which means it saves more energy consumption in the data center.The most optimum variable used to decrease the temperature is 1.5 lpm of flow rate and 800 rpm of fan rotation.Furthermore,the cooling performance of the dielectric fluids shows that the mineral oil(MO)is better than the virgin coconut oil(VCO).In durability experiment,there are no components damage after five months immersed in the fluid.Nugroho Agung Pambudi Awibi Muhamad Yusuf Alfan Sarifudin 2022Energy Engineering2022,119,1:2
13Cold Plasma:A Potential Alternative for Rice Grain Postharvest Treatment Management in Malaysia显示文摘Use of pesticides,herbicides and fertilizers is among the techniques to control insect pests and fungal pathogens.However,the technique is the major contributor to severe environmental implications in terms of air,water and soil pollution.Besides,variable inconsistency becomes an important issue in the implementation of inclined bed dryers,leading to significant rice grain loss.Cold plasma technology has been widely proposed as a potential alternative for rice grain postharvest treatment management due to the presence of generated ionised gas that eventually produces reactive oxygen species or reactive nitrogen species.These species are used to decontaminate foodborne pathogens,mycotoxins and bacterial diseases.This review explores the current literature regarding cold plasma treatment technology,focusing on its efficiency as the microbial decontamination medium and insect pest mortality medium,and on the enhancement functional,nutritional and cooking properties,especially in rice grains.Previous studies have successfully demonstrated the ability of cold plasma treatment to significantly reduce the microbial count of foodborne pathogens,detoxify mycotoxins,and control seedborne rice seedling bacterial diseases.Previous studies have also proved that the implementation of cold plasma technology in postharvest management should be seriously considered for improving rice grain quantity and quality in Malaysia.Mohd Fadthul Ikmal MISNAL Norizah REDZUAN Muhamad Nor Firdaus ZAINAL Norhayati AHMAD Raja Kamarulzaman RAJA IBRAHIM Linda AGUN 2022Rice science2022,29,1:2
14Formation of a dense and continuous AI2O3 layer in nano thermal barrier coating systems for the suppression of spinel growth on the AI2O3 oxide scale during oxidation 显示文摘DAROONPARVAR M YAJ1D MUHAMAD A M YUSOF N M HUSSAIN MOHAMMAD S RAD HAMID R B 2013Journal of Alloys and Compounds2013,571,:1
15Improving Phosphorus Availability in an Acid Soil Using Or ganic Amendments Produced from Agroindustrial Wastes显示文摘Huck Ywih Ch’ng Osumanu H A Nik Muhamad A b 2014Hindawi2014,6,:1
16Rhinitis:do diagnostic criteria affect the prevalebce and treatment显示文摘Wang D Muhamad N Smith D 2002Allergy2002,57,2:1
17De-fense-related polyphenol oxidase from Hevea brasiliensiscell suspension: purification and characterization显示文摘Muhamad N Chirapongsatonkul N Churngchow N 2012Ap-plied Biochemistry and Biotechnology2012,167,1:1
18Exploring the relationship between Intemet ethics in university students and the big five model of personality 显示文摘Nor Shahriza Abdtd Karim Nurul Hidayah Abroad Zam- zuri Yakinah Muhamad Nor Computers & Education0,53,1:1
19Case study on source rock deposition and preservation; NW Borneo deep water areas显示文摘Anuar A Muhamad A J 2000AAPG Bulletin2000,84,9:1
20Processing titanium foams using tapioca starch as a space holder 显示文摘MANSOURIGHASRI A MUHAMAD N SULONG A B 2012Journal of Materials Processing Technology2012,212,1:1
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