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A field study of a roof bolter canopy air curtain(2nd generation)for respirable coal mine dust control

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International Journal of mining Science and Technology 2019年第5期29卷 711-720页

作者： W.R.Reed S.Klima m.shahan G.J.H.Ross K.Singh R.Cross T.Grounds CDC NIOSH Pittsburgh Mining Research DivisionPittsburghPA 15236USA Fletcher&Co. HuntingtonWV 25705USA Prairie State Generating Company LLC Lively GroveIL 62257USA

A 2nd generation roof bolter canopy air curtain(CAC)design was tested by National Institute for Occupational Safety and Health(NIOSH)at a midwestern underground coal *** the study,the roof bolter never operated downwind of the continuous *** a combination of personal Data Rams(pDR)and gravimetric samplers,the dust control efficiency of the roof bolter CAC was *** evaluation was determined using three methods:(1)comparing roof bolter operator concentrations underneath the CAC to roof bolter concentrations outside the CAC,(2)comparing roof bolter operator concentrations underneath the CAC to the concentrations at the rear of the bolter,and finally,(3)using the gravimetric data directly underneath the CAC to correct roof bolter operator concentrations underneath the CAC and comparing them to the concentrations at the rear of the *** 1 dust control efficiencies ranged from 53.9%to 60.4%.method 2 efficiencies ranged from 150.5%to 52.2%,and method 3 efficiencies ranged from 40.7%to 91%.Reasons for negative and low dust control efficiencies are provided in this paper and include:incorrect sampling locations,large distance between CAC and operator,and contamination of intake air from line *** dust concentrations encountered during the testing made it difficult to discern whether differences in concentrations were due to the CAC or due to variances inherent in experimental dust ***,the analyses,especially the method 3 analysis,show that the CAC can be an effective dust control device.

关键词： Coal Roof bolter Respirable dust Underground mining

Field study results of a 3rd generation roof bolter canopy air curtain for respirable coal mine dust control

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International Journal of Coal Science & Technology 2020年第1期7卷 79-87页

作者： W.R.Reed m.shahan S.Klima G.Ross K.Singh R.Cross T.Grounds NIOSH PittsburghPA.USA J.H.Fletcher&Co. Huntington WVUSA Prairie State Generating Company LLC Lively GroveILUSA

A 3rd generation roof bolter canopy air curtain(CAC)has been developed and constructed by ***&Co.,*** with the previous generation of the CAC,this design uses the principle of providing uniform airflow across the canopy area as recommended by the National Institute for Occupational Safety and *** new modifications include a plenum that is constructed of a single flat aluminum plate,smaller-diameter airflow openings,and a single row of perimeter nozzles designed to prevent mine air contaminated by respirable dust from entering the CAC protection *** testing was conducted on this new 3rd generation design showing reductions in coal mine respirable dust exposure for roof bolter *** control efficiencies for the CAC for the left bolter operator(intake side)ranged from approximately 26%–60%,while the efficiencies for the CAC for the right bolter operator(return side)ranged from 3%to 47%.

关键词： Roof bolter Respirable dust Coal mining Canopy air curtain

Laboratory results of foam application testing for longwall shield dust control in a simulated environment

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International Journal of Coal Science & Technology 2021年第2期8卷 217-227页

作者： W.R.Reed m.R.shahan Y.Zheng A.mazzella CDC-NIOSH PittsburghPAUSA

There were 37 longwall faces operating in mines in the United States in *** average panel width for these longwalls was approximately 368.5 m(1209 ft).This translates to a range of approximately 170-240 shields per longwall,depending upon the width of *** movement of longwall shields is a significant contributor to respirable dust overexposures to longwall *** is expected to have the potential to reduce this shield dust *** foam is applied to the area on the roof between the coal face and the shield tip after the shearer *** this study,the longwall shield dust simulator was used to test three foam agents for their ability to control dust from longwall shield *** showed that at low-velocity ventilation(≈3.0 m/s(600 fpm))all foam agents were able to produce dust reduction levels of at least 45%.At high-velocity ventilation(≈5.1 m/s(1000 fpm)),the reductions were lower and more variable,ranging from being undeterminable for one foam agent to having 46%-63%reductions for the other two foam agents,with one instance of an increase in dust ***,the use of foam agents can provide longwall shield dust *** factors are roof coverage and the ability of foam to remain on the roof for extended time periods.

关键词： Longwall Shields Foam Respirable Dust Silica Dust

Support-Vector-machine-based Adaptive Scheduling in mode 4 Communication

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Computers, materials & Continua 2022年第11期73卷 3319-3331页

作者： muhammad Adnan Khan Ahmed Abu-Khadrah shahan Yamin Siddiqui Taher m.Ghazal Tauqeer Faiz munir Ahmad Sang-Woong Lee Riphah School of Computing&Innovation Faculty of ComputingRiphah International UniversityLahore CampusLahore54000Pakistan Pattern Recognition and machine Learning Lab Department of SoftwareGachon UniversitySeongnam13557Korea College of Computing&Informatics Saudi Electronic UniversityRiyadh11673Saudi Arabia School of Computer Science Minhaj University LahoreLahore54000Pakistan Center for Cyber Security Faculty of Information Science and TechnologyUniversiti Kebangsaan Malaysia(UKM)43600BangiSelangorMalaysia School of Information Technology Skyline University CollegeUniversity City Sharjah1797SharjahUAE School of Computer Science National College of Business Administration&EconomicsLahore54000Pakistan

Vehicular ad-hoc networks(VANETs)are mobile networks that use and transfer data with vehicles as the network ***,VANETs are essentially mobile ad-hoc networks(mANETs).They allow all the nodes to communicate and connect with one *** of the main requirements in a VANET is to provide self-decision capability to the *** memory,which stores all the previous routes,is used by the vehicles to choose the optimal *** networks,communication is *** cellular-based vehicle-to-everything(CV2X)communication,vital information is shared using the cooperative awareness message(CAm)that is broadcast by each *** are allocated in a distributed manner,which is known as mode 4 *** support vector machine(SVm)algorithm is used in the SVm-CV2X-m4 system proposed in this *** k-fold model with different values of k is used to evaluate the accuracy of the SVm-CV2Xm4 *** results show that the proposed system achieves an accuracy of 99.6%.Thus,the proposed system allows vehicles to choose the optimal route and is highly convenient for users.

关键词： mode-4 communication ad-hoc vehicular network CV2X support vector machine

In vivo anticancer activity of vanillin semicarbazone

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Asian Pacific Journal of Tropical Biomedicine 2012年第6期2卷 438-442页

作者： Shaikh m mohsin Ali m Abul Kalam Azad mele Jesmin Shamim Ahsan m mijanur Rahman Jahan Ara Khanam m Nazrul Islam Sha m.shahan Shahriar Department of Applied Chemistry and Chemical Engineering University of Rajshahi Department of Biochemistry and molecular Biology University of Rajshahi Department of Chemistry University of Chittagong Department of Food Science & Technology Chittagong Veterinary and Animal Science University

Objective:To evaluate the anticancer activity of vanillin semicarbazone(VSC) against Ehrlich ascites carcinoma(EAC) cells in Swiss albino ***:The compound VSC at three doses(5, 7.5 and 10 mg/kg i.p.) was administered into the intraperitoneal cavity of the EAC inoculated mice to observe its efficiency by studying the cell growth inhibition, reduction of tumour weight,enhancement of survival time as well as the changes in depleted hematological parameters. Allsuch parameters were also studied with a known standard drug bleomycin at the dose of 0.3 mg/kg(i.p.).Results:Among the doses studied, 10 mg/kg(i.p.) was found to be quite comparable in potency to that of bleomycin at the dose of 0.3 mg/kg(i.p.). The host toxic effects of VSC was found to be ***:It can be concluded that VSC can therefore be considered as potent anticancer agent.

关键词： Anticancer activity Ehrlich ascites carcinoma Schiffbase

Re-Use of Hospital Plastic Waste in Asphalt mixes as Partial Replacement of Coarse Aggregate

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Open Journal of Civil Engineering 2016年第3期6卷 381-387页

作者： Syed shahan Ali Shah Rawid Khan Iqra National University Peshawar Pakistan National Institute of Urban Infrastructure Planning University of Engineering & Technology Peshawar Pakistan

About 1.3 billion tons of waste is being generated in the world annually. This waste is a cause of various diseases. Open dumping of waste also destroys valuable agricultural land. Various researchers have beneficially used plastic waste in cement concrete and asphalt concrete in the past. This study aims at the use of aggregates, made from different types of plastic waste, as partial replacement of coarse aggregates in asphalt mixes. For this purpose waste is collected from different hospitals of the city. Sorted plastic from the waste consists of 64% low density polyethene, 32% high density polyethene and 4% of polypropylene. Plastic waste is shredded, heated and after cooling, pulverizes manually and mechanically. Specific gravity of plastic aggregates is 0.96. Water absorption and soundness values are 4.68% and 7.68% respectively. Impact, crushing and Loss Angeles values of plastic aggregates are 0.7%, 0.5%, and 1.1% respectively. Replacement of natural aggregates by plastic aggregates in asphalt mixes is done up to 25% with 5% incremental increase. Density of asphalt mixes decreases to 2060 kg/m3. Consequently flow increases to 5.73 mm. maximum stability is at 20% replacement i.e. 34.57 KN. Cost analysis of the study indicates that 205% increase in stability are observed with 219% increase in cost.

关键词： Hospital Waste (HW) Plastic Waste Waste Generation Asphalt Stability Plastic Aggregates

In vivo anticancer activity of vanillin,benzophenone and acetophenone thiosemicarbazones on Swiss albino mice

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Journal of Coastal Life medicine 2014年第10期 811-816页

作者： Sha md.shahan Shahriar Shaikh m mohsin Ali mele Jesmin md.Khairul Islam Sarozit mondal Department of Applied Chemistry and Chemical Engineering University of RajshahiRajshahi-6205Bangladesh

Objective:To study the anticancer activities of three schiff bases *** thiosemicarbazone,benzophenone thiosemicarbazone and acetophenone thiosemicarbazone against Ehrlich ascites carcinoma(EAC)cells in Swiss albino ***:Synthesized compounds have administrated into the intraperitoneal cavity of the EAC inoculated mice at two *** anticancer activities have studied by monitoring the parameters such as cell growth inhibition,tumor weight measurement,survival time of EAC bearing mice as well as the changes in depleted hematological parameters due to *** such data have been compared with those of a known standard drug bleomycin at the dose of 0.3 mg/kg(i.p.).Results:It has been found that these bases enhanced life span,reduced average tumor weight and inhibited tumor cell growth of EAC cell bearing mice *** results were similar in potency to those obtained with *** was also found that the depleted hematological parameters(red blood count,white blood count and haemoglobin content)were found to be restored gradually towards normal within few weeks after ceasing the ***:The compounds can be primarily considered more or less as potent anticancer agents.

关键词： Anticancer activity Ehrlich ascites carcinoma cells Thiosemicarbazones