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https://www.readbyqxmd.com/read/28735499/an-evaluation-of-the-reliability-of-the-characterization-of-the-porous-structure-of-activated-carbons-based-on-incomplete-nitrogen-adsorption-isotherms
#1
Mirosław Kwiatkowski, Bassim H Hameed
The paper presents the results of research devoted to reliability evaluation of the analysis of results of the porous structure of activated carbons based on incomplete nitrogen adsorption isotherms using the BET, t-plot, and NLDFT methods, as well as the LBET method comprising the unique numerical fast multivariant procedure of adsorption system identification. The research involved the application of the nitrogen adsorption isotherms obtained for five samples of activated carbons produced from waste materials of organic origin by way of chemical activation with potassium hydroxide, sodium hydroxide, and potassium carbonate with the use of microwave heating...
August 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28735185/mil-101-cr-go-for-dispersive-micro-solid-phase-extraction-of-pharmaceutical-residue-in-chicken-breast-used-in-microwave-assisted-coupling-with-hplc-ms-ms-detection
#2
Yudan Wang, Xinpeng Dai, Xi He, Lin Chen, Xiaohong Hou
In this work, MIL-101(Cr)@GO (Graphite Oxide) was synthesized using a hydrothermal synthesis method and was applied as a dispersive micro-solid-phase extraction (D-μ-SPE) sorbent for the efficient concentration of four residual drugs (metronidazole, MNZ; tinidazole, TNZ; chloramphenicol, CAP; sulfamethoxazole, SMX). Meanwhile, the extraction process was optimized by combining it with microwave-assisted extraction. Factors affecting the D-μ-SPE efficiency, such as selection of sorbent materials, pH of the sample solution, salting-out effect, amount of used material, extraction time, desorption solvent and desorption time, were studied...
July 11, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28734284/cage-model-of-polar-fluids-finite-cage-inertia-generalization
#3
W T Coffey, M Zarifakis, Y P Kalmykov, S V Titov, W J Dowling, A S Titov
The itinerant oscillator model describing rotation of a dipole about a fixed axis inside a cage formed by its surrounding polar molecules is revisited in the context of modeling the dielectric relaxation of a polar fluid via the Langevin equation. The dynamical properties of the model are studied by averaging the Langevin equations describing the complex orientational dynamics of two bodies (molecule-cage) over their realizations in phase space so that the problem reduces to solving a system of three index linear differential-recurrence relations for the statistical moments...
July 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28734162/extraction-and-in-vitro-screening-of-potential-acetylcholinesterase-inhibitors-from-the-leaves-of-panax-japonicus
#4
Sainan Li, Chengyu Liu, Chunming Liu, Yuchi Zhang
Ultrafiltration liquid chromatography-mass spectrometry (UFLC-MS) is an efficient method that can be applied to rapidly screen and identify ligands for acetylcholinesterase (AChE) from the leaves of Panax japonicus. Using this method, we identified 5 major compounds, chikusetsusaponins V, Ib, IV, IVa, and IVa ethyl ester, as potent AChE inhibitors, which were assessed for anti-Alzheimer disease activity using the PC12 cell model. A continuous online method, which consisted of microwave-assisted extraction, a solvent concentration tank, and centrifugal partition chromatography (MAE-SCT-CPC), was newly developed for scaled up production of these compounds with high purity and efficiency...
July 12, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28733683/radiation-loss-of-planar-surface-plasmon-polaritons-transmission-lines-at-microwave-frequencies
#5
Zhixia Xu, Shunli Li, Xiaoxing Yin, Hongxin Zhao, Leilei Liu
Radiation loss of a typical spoof surface plasmon polaritons (SSPPs) transmission line (TL) is investigated in this paper. A 325 mm-long SSPPs TL is designed and fabricated. Simulated results show that radiation loss contributes more to transmission loss than dielectric loss and conductor loss from 2 GHz to 10 GHz. Radiation loss of the SSPPs TL could be divided into two parts, one is caused by the input mode converter, and the other is caused by the corrugated metallic strip. This paper explains mechanisms of radiation loss from different parts, designs a loaded SSPPs TL with a series of resistors to absorb electromagnetic energy on corrugated metallic strip, and then discriminates radiation loss from the input mode converter, proposes the concept of average radiation length (ARL) to evaluate radiation loss from SSPPs of finite length, and concludes that radiation loss is mainly caused by corrugated structure of finite length at low frequency band and by the input mode converter at high frequency band...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28733518/ultrasound-guided-percutaneous-microwave-ablation-assisted-by-three-dimensional-visualization-operative-treatment-planning-system-and-percutaneous-transhepatic-cholangial-drainage-with-intraductal-chilled-saline-perfusion-for-larger-hepatic-hilum-hepatoce
#6
Xin Li, Jie Yu, Ping Liang, Xiaoling Yu, Zhigang Cheng, Zhiyu Han, Shaobo Duan, Jiasheng Zheng
To assess the clinical efficiency of ultrasound-guided percutaneous microwave ablation (US-PMWA) assisted by three-dimensional (3D) visualization operative treatment planning system and percutaneous transhepatic cholangial drainage with intraductal chilled saline perfusion (PTCD-ICSP) for larger hepatic hilum hepatocellular carcinoma (HH-HCC) (D ≥ 3 cm). The combination therapy was performed in 14 patients from Sep 2011 to May 2017. The major outcomes for assessment were biliary duct complications, local tumor recurrence, distant recurrence and overall survival rates...
July 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28733200/hypothermic-cooling-measured-by-thermal-mri-imaging-feasibility-and-implications-for-virtual-imaging-in-the-urogenital-pelvis
#7
Douglas Skarecky, Hon Yu, Jennifer Linehan, Blanca Morales, Min-Ying Su, Peter Fwu, Thomas Ahlering
OBJECTIVE: To study the combination of thermal MRI imaging and novel hypothermic cooling, via an Endorectal Cooling Balloon (ECB) to assess the effective dispersion and temperature drop in pelvic tissue to potentially reduce inflammatory cascade in surgical applications. METHODS: Three male subjects, prior to undergoing robot-assisted radical prostatectomy (RARP), were cooled via an ECB, rendered MRI compatible by for patient safety Prior to ECB hypothermia. MRI studies were performed using a 3T scanner and included T2w anatomical scan for the pelvic structures, followed by a temperature mapping scan...
July 18, 2017: Urology
https://www.readbyqxmd.com/read/28732947/transesterification-of-soybean-oil-by-using-the-synergistic-microwave-ultrasonic-irradiation
#8
Guo-Wei Yu, Jing Nie, Lin-Guang Lu, Shen-Peng Wang, Zu-Guang Li, Maw-Rong Lee
Microwave and ultrasound have been demonstrated to be outstanding process intensification techniques for transesterification of oil. According to their mechanisms, simultaneous effects can surely bring about better enhancement than sole microwave or ultrasound. Therefore, this study aimed to investigate the important factors and their suitable levels in the KOH-catalyzed transesterification of soybean oil with methanol by using synergistic assistance of microwave-ultrasound (CAMU). The feasibility of application of CAMU in transesterification of oil was demonstrated...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732286/development-of-liquid-chromatographic-methods-for-enantioseparation-and-sensitive-detection-of-%C3%AE-adrenolytics-%C3%AE-2-agonists-in-human-plasma-using-a-single-enantiomer-reagent
#9
Poonam Malik, Ravi Bhushan
Enantioseparation of four commonly used β-adrenolytics (bisoprolol, salbutamol, and carvedilol, marketed as racemic mixtures) has been achieved by both TLC and RPHPLC via an indirect approach. A new chiral reagent, (S)-naproxen benzotriazole ester, was synthesized and it was characterized by UV, IR, (1)HNMR, elemental analysis and polarimetry. It was used to synthesize diastereomeric derivatives of the three β-adrenolytics under microwave irradiation. TLC separation of diastereomeric derivatives was achieved which were then isolated by preparative approach; these were characterized and were used as standard reference for determining absolute configuration of diastereomeric derivatives and for establishing validated HPLC method for enantioseparation and sensitive detection of the three β-adrenolytics in human plasma...
July 14, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28731318/ultrafast-ionic-liquid-assisted-microwave-synthesis-of-sno-microflowers-and-their-superior-sodium-ion-storage-performance
#10
Bingsheng Qin, Huang Zhang, Thomas Diemant, Dorin Geiger, Rinaldo Raccichini, R Jürgen Behm, Ute Kaiser, Alberto Varzi, Stefano Passerini
Tin oxide (SnO) is considered one of the most promising metal oxides for utilization as anode material in sodium ion batteries (SIBs), due to its ease of synthesis, high specific gravimetric capacity and satisfactory cycling performance. However, to aim at practical applications, the coulombic efficiency during cycling needs to be further improved, which requires a deeper knowledge of its working mechanism. Here, a microflower-shaped SnO material is synthesized by means of an ultrafast ionic liquid-assisted microwave method...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28731316/phytochemical-analysis-of-myrtus-communis-plant-conventional-versus-microwave-assisted-extraction-procedures
#11
Nadia Bouaoudia-Madi, Lila Boulekbache-Makhlouf, Nabil Kadri, Farid Dahmoune, Hocine Remini, Sofiane Dairi, Sonia Oukhmanou-Bensidhoum, Khodir Madani
Background Myrtle (Myrtus communis L) may constitute an interesting dietary source of health protective compounds. Microwave-assisted extraction (MAE) of total phenolic compounds (TPC) from myrtle leaf, stems, pericarp, and seeds was studied and the results were compared with those of the conventional method extraction (CME) in terms of extraction time. Methods Extraction yield/efficiency and antioxidant activity were measured using radical scavenging assay (DPPH•) and reducing power. Results The results show that the MAE was higher in terms of saving energy, extraction time (62 s) and extraction efficiency of bioactive compound compared to CME (2 h)...
June 10, 2017: Journal of Complementary & Integrative Medicine
https://www.readbyqxmd.com/read/28731101/selective-molecular-annealing-in-situ-small-angle-x-ray-scattering-study-of-microwave-assisted-annealing-of-block-copolymers
#12
Daniel T W Toolan, Kevin Adlington, Anna Isakova, Alexis Kalamiotis, Parvaneh Mokarian-Tabari, Georgios Dimitrakis, Christopher Dodds, Thomas Arnold, Nick J Terrill, Wim Bras, Daniel Hermida Merino, Paul D Topham, Derek J Irvine, Jonathan R Howse
Microwave annealing has emerged as an alternative to traditional thermal annealing approaches for optimising block copolymer self-assembly. A novel sample environment enabling small angle X-ray scattering to be performed in situ during microwave annealing is demonstrated, which has enabled, for the first time, the direct study of the effects of microwave annealing upon the self-assembly behavior of a model, commercial triblock copolymer system [polystyrene-block-poly(ethylene-co-butylene)-block-polystyrene]...
July 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28730773/thermal-ablation-may-improve-outcomes-in-patients-with-colorectal-liver-metastasis-a-case-control-study
#13
Loukia S Poulou, Loukas Thanos, Panayiotis D Ziakas, Emmanouel Merikas, Apostolos Achimastos, Constantine Gennatas, Konstantinos N Syrigos
PURPOSE: Local thermal ablation may extend the scope of palliative therapy in patients with colorectal liver metastasis. We performed a retrospective, case-controlled study to compare patients with colorectal liver metastases that were treated with percutaneous radiofrequency (RF) or microwave (MW) thermal ablation, against the control group of chemotherapy alone. METHODS: We described baseline demographics, ablation sessions, procedure duration and related complications...
May 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/28730772/a-comparative-study-of-laparoscopic-microwave-ablation-with-laparoscopic-radiofrequency-ablation-for-colorectal-liver-metastasis
#14
Bo Yang, Yuwei Li
PURPOSE: Laparoscopic thermal ablation is a common alternative to surgical resection for treating colorectal liver metastasis, particularly for metastases located in difficult-to-reach regions. This study aimed to compare the short- and longterm outcomes of laparoscopic radiofrequency ablation (LRFA) and laparoscopic microwave ablation (LMWA) used for treating colorectal liver metastasis. METHODS: Data from patients with colorectal liver metastasis who had undergone LRFA or LMWA from January 2010 to January 2016 were examined...
May 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/28729813/novel-design-integrating-a-microwave-applicator-into-a-crystallizer-for-rapid-temperature-cycling-a-direct-nucleation-control-study
#15
Rohit Kacker, Marilena Radoiu, Herman J M Kramer
The control of nucleation in crystallization processes is a challenging task due to the often lacking knowledge on the process kinetics. Inflexible (predetermined) control strategies fail to grow the nucleated crystals to the desired quality because of the variability in the process conditions, disturbances, and the stochastic nature of crystal nucleation. Previously, the concept of microwave assisted direct nucleation control (DNC) was demonstrated in a laboratory setup to control the crystal size distribution in a batch crystallization process by manipulating the number of particles in the system...
July 5, 2017: Crystal Growth & Design
https://www.readbyqxmd.com/read/28729540/direct-growth-of-mos2-nanowalls-on-carbon-nanofibers-for-use-in-supercapacitor
#16
Fitri Nur Indah Sari, Jyh-Ming Ting
Direct growth of MoS2 nanowalls on vapor grown carbon nanofibers (VGCNFs) has been achieved using a microwave-assisted hydrothermal (MAH) method under an acidic condition. The acidic condition was obtained through the addition of an HCl aqueous solution. We demonstrate that the HCl not only modifies the pH value for limiting the growth rate but also leads to the formation of NaCl, which is the key for the direct and unique growth of MoS2 on the VGCNF surface. A growth mechanism is therefore proposed. The growth of MoS2 onto the high electrically conducting VGCNF creates a unique structure that not only reduces the aggregation of MoS2 but also improves the electrical conductivity of the resulting composite electrode...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28728442/an-integrated-platform-for-small-animal-hyperthermia-investigations-under-ultra-high-field-mri-guidance
#17
Sergio Curto, Pegah Faridi, Tej B Shrestha, Marla Pyle, Leila Maurmann, Deryl Troyer, Stefan H Bossmann, Punit Prakash
PURPOSE: Integrating small-animal experimental hyperthermia instrumentation with magnetic resonance imaging (MRI) affords real-time monitoring of spatial temperature profiles. This study reports on the development and preliminary in vivo characterisation of a 2.45 GHz microwave hyperthermia system for pre-clinical small animal investigations, integrated within a 14 T ultra-high-field MRI scanner. MATERIALS AND METHODS: The presented system incorporates a 3.5 mm (OD) directional microwave hyperthermia antenna, positioned adjacent to the small-animal target, radiating microwave energy for localised heating of subcutaneous tumours...
July 21, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28728304/-percutaneous-microwave-radiofrequency-ablation-liver-partition-and-portal-vein-embolization-for-planned-hepatectomy-for-colorectal-liver-metastases-with-insufficient-future-liver-remnant
#18
Y B Zhang, D F Hong, X M Fan, Z Y Luo, G L Shen
No abstract text is available yet for this article.
July 23, 2017: Zhonghua Zhong Liu za Zhi [Chinese Journal of Oncology]
https://www.readbyqxmd.com/read/28728003/evaluation-of-the-effects-of-low-energetic-microwave-irradiation-on-anaerobic-digestion
#19
Bert Bastiaens, Rob Van den Broeck, Lise Appels, Raf Dewil
The present study investigates the effects of microwave irradiation on the performance of anaerobic digestion processes. A first set of experiments is performed to distinguish the upper limit of the applied energy levels. Secondly, the effects of these treatments on the performance of the digestion process are evaluated in 3 experimental setups: (i) monitoring the acetic acid degradation, (ii) performing a biological methane potential (BMP) assay and (iii) conducting a specific methanogenic activity (SMA) test...
July 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28727561/a-cots-based-microwave-imaging-system-for-breast-cancer-detection
#20
Mario R Casu, Marco Vacca, Jorge A Tobon, Azzurra Pulimeno, Imran Sarwar, Raffaele Solimene, Francesca Vipiana
Microwave imaging is an emerging breast cancer diagnostic technique, which aims at complementing already established methods like mammography, magnetic resonance imaging, and ultrasound. It offers two striking advantages: no-risk for the patient and potential low-cost for national health systems. So far, however, the prototypes developed for validation in labs and clinics used costly lab instruments such as a vector network analyzer (VNA). Moreover, the CPU time required by complex image reconstruction algorithms may not be compatible with the duration of a medical examination...
July 18, 2017: IEEE Transactions on Biomedical Circuits and Systems
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