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TGA/DSC study to characterise and classify coal seams conforming to susceptibility towards spontaneous combustion

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International Journal of Mining Science and Technology 2022年第1期32卷 75-88页

作者： Niroj Kumar Mohalik Somu Mandal Santosh Kumar Ray asfar mobin khan Debashish Mishra Jai Krishna Pandey CSIR-Central Institute of Mining and Fuel Research(CIMFR) Dhanbad 826015India Academy of Scientific and Innovative Research(AcSIR) Ghaziabad 201002India

Thermogravimetric analysis/differential scanning calorimeter(TGA/DSC)technique along with basic coal characteristics study is carried out for eighty coal samples of Indian coalfields,to determine spontaneous combustion propensity behaviour of *** study of coal samples indicates that there is an increase in the mass of coal samples in the temperature range 150-350℃,which may be due to oxygen adsorption and *** correlation and principal component analysis states that the component of proximate analysis(M_(ad),VM_(d),FR,and VR)have an acceptable correlation with the TGA experiments results i.e.,Tgsh and *** fixed nonlinear regression analysis shows that thermogravimetry(TG)experiment results Tgign may be the best index to categorise/classify the coal as per their susceptibility towards spontaneous *** authors proposed four groups of classification as per their propensity towards spontaneous combustion depending upon the moisture(M_(ad)),volatile matter(VM_(d)),and TG ignition temperature from differential thermogravimetric(DTG)curve(Tgign)using hierarchal clustering *** coal samples of different seams from Indian coalfield may be classified into four different clusters,*** highly/extremely susceptible(Tgign320℃).The field observations and TGA/DSC experiment results with the following statistical analysis substantiate a similar assessment.

关键词： Coal TGA/DSC Spontaneous combustion TG ignition

CFD modeling to study the effect of particle size on dispersion in 20l explosion chamber: An overview

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International Journal of Mining Science and Technology 2020年第3期30卷 321-327页

作者： Santosh Kumar Ray Niroj Kumar Mohalik asfar mobin khan Debashish Mishra Nikhil Kumar Varma Jai Krishna Pandey Pradeep Kumar Singh CSIR-Central Institute of Mining and Fuel Research Dhanbad 826001India

Mine disasters occur predominantly due to methane or coal dust explosion or a combination of *** the top ten worst coal mine disasters in India, nine are due to coal dust explosion. The current paper describes a general overview of the parameters causing dispersion leading to coal dust explosion,and computational fluid dynamics(CFD) simulation study to observe the effects of particle size on dispersion in Indian coal mines. Turbulent kinetic energy(TKE) and velocity vector path of dust-air mixture and dust-free air were simulated to understand their effects on coal dust dispersion. The TKE contours and velocity vector paths for dust-free air were uniform and symmetrical due to resistance-free path available. The TKE contours and velocity vector paths for dust-air mixture shows the asymmetrical distribution of contours, due to entrainment of air with dust particles. Vortices were observed in velocity vector paths which gradually diminish on increment of time sequence. These vortices are dead centres where velocity and coal dust particles concentration are both zero.

关键词： Coal dust explosibility CFD 20l explosion chamber Dispersion Turbulent kinetic energy

Hydrocarbon Potential of the Triassic-Jurassic Sediments in Southeast Sulawesi, Indonesia, Based on Lithofacies and Geochemical Analysis

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Open Journal of Geology 2024年第8期14卷 723-745页

作者： Muhammad Sulhuzair Burhanuddin Shun Chiyonobu Takuto Ando Anggi Yusriani Ratna Husain Suryawan asfar Graduate School of International Resources Sciences Akita University Akita Japan Geological Department of Hasanuddin University Makassar Indonesia Geoservices Laboratory South Jakarta Indonesia Geological Department of Haluoleo University Kendari Indonesia

Triassic-Jurassic carbonates widely distributed in Eastern Indonesia are believed as oils source rock. The Mesozoic Tokala Formation exhibit source rock potential, as evidenced by high contents of organic matter. Recent exploration has been conducted in southeastern Sulawesi, targeting the Mesozoic intervals. Therefore, in this study, we attempted to determine source rock potential of Tokala Formation outcropped in southeastern Sulawesi area and its capability to generate hydrocarbon. Five distinct lithofacies were delineated, emphasizing lithological and mineralogical features: foraminifera wackestone (FW), lime mudstone (LM), massive bioturbated calcareous-argillaceous shale (MBCAS), weakly laminated argillaceous-calcareous shale (WLACS), and strongly laminated calcareous-argillaceous shale (SLCAS). Subsequent analyses showed that carbonate-rich samples (FW and LM facies, >50% CaO) had poor source rock potential. Conversely, shale facies with moderate carbonate content (WLACS, MBCAS, and SLCAS, 15% - 50% CaO) had good to excellent source rock characteristics, qualifying them as preferable source rock. In addition, levels of SiO2 and Al2O3 should not be neglected, as these constituents play important roles in clay mineral adsorption. Laminated shale facies with moderate CaO content tended to be more promising as source rock than bioturbated facies. The shale facies of Tokala Formation indicate prospective source rock horizon.

关键词： Source Rock Triassic-Jurassic Source Rock Lithofacies Southeastern Sulawesi Tokala Formation

Exteriorized colon anastomosis for unprepared bowel: An alternative to routine colostomy

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World Journal of Gastroenterology 2007年第23期13卷 3215-3220页

作者： Sami K asfar Hilal M Al-Sayer Talib H Juma Professor and Chairman Department of Surgery Faculty of Medicine Kuwait University and Mubarak Al-Kabeer Hospital Safat-13110 Kuwait Associate Professor Department of Surgery Faculty of Medicine Kuwait University and Department of Surgery Ameri Hospital Kuwait Consultant Surgeon Department of Surgery Ameri Hospital Kuwait

AIM: To see the possibility of avoiding routine colostomy in patients presenting with unprepared bowel. METHODS: The cohort is composed of 103 patients, of these, 86 patients presented as emergencies (self- inflected and iatrogenic colon injuries, stab wounds and blast injury of the colon, volvulus sigmoid, obstructing left colon cancer, and strangulated ventral hernia). Another 17 patients were managed electively for other colon pathologies. During laparotomy, the involved segment was resected and the two ends of the colon were brought out via a separate colostomy wound. One layer of interrupted 3/0 silk was used for colon anastomosis. The exteriorized segment was immediately covered with a colostomy bag. Between the 5th and 7th postoperative day, the colon was easily dropped into the peritoneal cavity. The defect in the abdominal wall was closed with interrupted nonabsorbable suture. The skin was left open for secondary closure. RESULTS: The mean hospital stay (± SD) was 11.5 ± 2.6 d (8-20 d). The exteriorized colon was successfully dropped back into the peritoneal cavity in all patients except two. One developed a leak from oesophago- jejunostomy and from the exteriorized colon. She subsequently died of sepsis and multiple organ failure (MOF). In a second patient the colon proximal to the exteriorized anastomosis prolapsed and developed severe serositis, an elective ileo-colic anastomosis (to the left colon) was successfully performed. CONCLUSION: Exteriorized colon anastomosis is simple, avoids the inconvenience of colostomy and can be an alternative to routine colostomy. It is suitable where colostomy is socially unacceptable or the facilities and care is not available.

关键词： Colostomy Exteriorized colon Colon injury Colon anastomosis Unprepared colon Obstructing colon cancer Volvulus sigmoid

Prostate cancer stem cells： molecular characterization for Largeted therapy

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Asian Journal of Andrology 2012年第5期14卷 659-660页

作者： asfar S Azmi Fazlul H Sarkar Department of Pathology Karmanos Cancer Institute Wayne State University School of Medicine Detroit MI 48201 USA Department of Oncology Karmanos Cancer Institute Wayne State University School of Medicine Detroit M148201 USA

The article published recently in Cell Stem Cell from the laboratory of Dr Tang showed the existence and molecular fingerprints of prostate cancer stem cells （CSCs）, and this report opens newer ave- nues for developing and designing novel therapeutic strategies for targeted elimina- tion of these CSCs toward prostate cancer therapy.

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Pancreatic neuroendocrine tumors: Therapeutic challenges and research limitations

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World Journal of Gastroenterology 2020年第28期26卷 4036-4054页

作者： Gabriel Benyomo Mpilla Philip Agop Philip Bassel El-Rayes asfar Sohail Azmi Department of Oncology Wayne State University School of MedicineDetroitMI 48201United States Department of Hematology Oncology Emory Winship InstituteAtlantaGA 30322United States

Pancreatic neuroendocrine tumors(PNETs)are known to be the second most common epithelial malignancy of the *** can be listed among the slowest growing as well as the fastest growing human *** prevalence of PNETs is deceptively low;however,its incidence has significantly increased over the past *** to the American Cancer Society’s estimate,about 4032(>7%of all pancreatic malignancies)individuals will be diagnosed with PNETs in *** often cause severe morbidity due to excessive secretion of hormones(such as serotonin)and/or overall tumor *** can live for many years(except for those patients with poorly differentiated G3 neuroendocrine tumors);thus,the prevalence of the tumors that is the number of patients actually dealing with the disease at any given time is fairly high because the survival is much longer than pancreatic ductal *** to significant heterogeneity,the management of PNETs is very complex and remains an unmet clinical *** terms of research studies,modest improvements have been made over the past decades in the identification of potential oncogenic drivers in order to enhance the quality of life and increase survival for this growing population of ***,the majority of systematic therapies approved for the management of advanced stage PNETs lack objective response or at most result in modest benefits in *** this review,we aim to discuss the broad challenges associated with the management and the study of PNETs.

关键词： Pancreatic neuroendocrine tumors Gastroenteropancreatic neuroendocrine tumors Management Limitation Novel Agents Emerging targets

Rotating Squeezed Vacua as Time Machines

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Journal of Modern Physics 2016年第3期7卷 304-311页

作者： S. Al Saleh L. A. Al asfar A. Mahroussah Department of Physics and Astronomy College of Science King Saud University Riyadh Saudi Arabia

Squeezed quantum vacua seems to violate the averaged null energy conditions (ANEC’s), because they have a negative energy density. When treated as a perfect fluid, rapidly rotating Casimir plates will create vorticity in the vacuum bounded by them. The geometry resulting from an arbitrarily extended Casimir plates along their axis of rotation is similar to van Stockum spacetime. We observe closed timelike curves (CTC’s) forming in the exterior of the system resulting from frame dragging. The exterior geometry of this system is similar to Kerr geometry, but because of violation of ANEC, the Cauchy horizon lies outside the system unlike Kerr blackholes, giving more emphasis on whether spacetime is multiply connected at the microscopic level.

关键词： Squeezed quantum vacua seems to violate the averaged null energy conditions (ANEC’s) because they have a negative energy density. When treated as a perfect fluid rapidly rotating Casimir plates will create vorticity in the vacuum bounded by them. The geometry resulting from an arbitrarily extended Casimir plates along their axis of rotation is similar to van Stockum spacetime. We observe closed timelike curves (CTC’s) forming in the exterior of the system resulting from frame dragging. The exterior geometry of this system is similar to Kerr geometry but because of violation of ANEC the Cauchy horizon lies outside the system unlike Kerr blackholes giving more emphasis on whether spacetime is multiply connected at the microscopic level.

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大海与岩石的对话--黎巴嫩KALI别墅

室内设计与装修 2017年第1期 44-47页

作者： [黎]blankpage architects+karim nader studio Marwan Harmouche(摄影) Nadim asfar(摄影) 小麦(编译) 不详

今年6月刚刚完成竣工的Kali别墅，是位于黎巴嫩Mounsef的一处海滨别墅，总面积达2000m2，共有11问卧室，另外还配备了健身房、泳池等设施。 BLANK- PAGE Architects ＋ Karim Nader Studio负责了从建筑到室内到家具以及软装的整套设计... 详细信息

今年6月刚刚完成竣工的Kali别墅，是位于黎巴嫩Mounsef的一处海滨别墅，总面积达2000m2，共有11问卧室，另外还配备了健身房、泳池等设施。 BLANK- PAGE Architects ＋ Karim Nader Studio负责了从建筑到室内到家具以及软装的整套设计，共历时4年。

关键词：黎巴嫩别墅对话岩石大海 PAGE 健身房套设计