Journal of Chemistry: Education Research and Practice最新文献

{"title":"Effect of Narrowband-UVB Phototherapy Treatment on Total Ferroxidase Activity and Ceruloplasmin Oxidase Activity in Sera of Iraqi Vitiligo Patients","authors":"","doi":"10.33140/jcerp.04.02.01","DOIUrl":"https://doi.org/10.33140/jcerp.04.02.01","url":null,"abstract":"Vitiligo is an acquired pigmentary disorder in which white depigmented macules and patches of skin appear on different parts of the body, affecting all ages and both sexes equally. Focal, segmen-tal, generalized and universal are considered the most characteristic patterns of vitiligo. One of the most effective treatment of this disorder is using light therapy, and in particular ultraviolet (UV) light. Among them narrowband ultraviolet B phototherapy (NB-UVB) is the most widely used. Oxidative stress is considered to be one of the possible pathogenic events in melanocyte loss. Imbalance in the oxidant/antioxidant system have been demonstrated in blood of vitiligo patients. To demonstrate the safety of using NB-UVB phototherapy treatment in vitiligo Iraqi patients. Patients with vitiligo group were treated with NB-UVB regimen as three times weekly on non- consecutive days for a total of 20 sessions (about 2 months). Total ferroxidase (activity and specific activity), ceruloplasmin concentration, ceruloplasmin oxidase (activity and specific activity) and serum copper were determined in all participants before and after NBUVB phototherapy. The above biochemical parameters were measured in serum samples of 30 vitiligo patients before and after treatment with the narrow band UVB phototherapy. NB-UVB treatment was found to be associated with a significant reduction in copper ion concentration, but no significant differences in total ferroxidase (activity and specific activity), ceruloplasmin oxidase (activity and specific activity), and ceruloplasmin concentration. The present results provide evidence which support using narrow band UVB phototherapy as a safe method for vitiligo treatment.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128522000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of Noble Environmentally Friendly and High Efficient Fire-Extinguishing Means","authors":"","doi":"10.33140/jcerp.04.02.02","DOIUrl":"https://doi.org/10.33140/jcerp.04.02.02","url":null,"abstract":"Reviewing the history of the development of preventing measures, to ensure suppression of fire clearly reveals, that the most urgent of these measures is the use of environmentally friendly, highly efficiency fire extinguishing means. The best fire-extinguishing means are fire-extinguishing powders, which are characterized by high effectiveness and universality. Fire- extinguishing powders of serial production represents the fine dispersed mineral salts with different additives, which decrease tendency of consolidation and caking of powder. In serial production powders halogen containing, organic hydrophobizators are mainly used as such additives. Thus, most of them are halogen containing and do not satisfy the contemporary demands, in the first place with the view of effective, non-toxic and universal use. It also should be mentioned, that fire- extinguishing powders are characterized with less heat capacity, low permeability and wetting effect compared to water and foams, that’s why at extinguishing large scale fires, particularly - forest fires, use of just fire- extinguishing powders is less effective. This article discusses the elaboration of non-halogen, environmentally friendly, high-efficient, universal fireextinguishing powders on the basis of local mineral raw materials of silicate origin and production of highly effective foam-suspensions based on such powders, the use of which will have higher extinguishing ability than water, foams or powders taken separately. The received fire-extinguishing powders will be used at extinguishing of all classes of fires, as well as, in complex with water and foams for extinguishing of large scale fires – forest fires.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133352584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on the effect of the size of the wall-hanging air-conditioner indoor unit on the indoor thermal comfort","authors":"Kuanbing Caozhu, Changfa Ji","doi":"10.21203/rs.3.rs-27036/v1","DOIUrl":"https://doi.org/10.21203/rs.3.rs-27036/v1","url":null,"abstract":"\u0000 The geometrical dimension of the wall-hanging air-conditioner indoor unit affects the indoor thermal comfort. In this paper, fluent software is used and standard k-e two equation turbulent model is chosen to carry out the simulation of the indoor temperature field and flow field of six different sizes of the single wall-hanging indoor air-conditioner in the room. The temperature distribution, velocity distribution and PMV distribution of the plane which is 1.8 m from the ground are given. It can be known that under the condition of six kinds of sizes of the wall-hanging air-conditioner indoor unit, when the size of the air-conditioner indoor unit is 0.4m × 0.2m × 0.2 m, the temperature variation at the z = 1.8 m section is relatively small, the temperature distribution is more uniform. When the size of the air-conditioner indoor unit is 0.5m × 0.2m × 0.2 m, the temperature difference at the z = 1.8 m section is relatively smaller, PMV is closest to 0, and the thermal sensation is almost moderate. Therefore when the size of the air-conditioner indoor unit is 0.5m × 0.2m × 0.2 m, better indoor comfort can be achieved.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126366345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Raman Spectroscopy: A Proposal for Didactic Innovation (IKD Model) In the\u0000Experimental Science Subject of the 3rd Year of the Primary Education Degree","authors":"","doi":"10.33140/jcerp.04.01.06","DOIUrl":"https://doi.org/10.33140/jcerp.04.01.06","url":null,"abstract":"In recent years, new innovative teaching methodologies have been used in the Basque Country University (IKD\u0000model) for experimental science classes for teachers of Primary Education in formation. This IKD model is based\u0000on a cooperative and dynamic learning. It is an own, cooperative, multilingual and inclusive model that emphasizes\u0000that students are the owners of their learning and are formed in a comprehensive, flexible and adapted to the needs\u0000of society. Training students according to IKD model requires creating new ways of teaching and learning more\u0000active and cooperative (curriculum development). Therefore, the fact of combining more theoretical master classes\u0000with more practical classes is a trend that is increasingly used. For this reason, combining concepts of chemistry and\u0000physics assumes that the student relates different ideas that are a priori complex and unrelated, but in the scientific\u0000field, they are related. In this way, the work presented is a proposal of methodology for the subject of experimental\u0000sciences for teachers in training, which will introduce real scientific instrumentation such as Raman spectroscopy,\u0000which can be of great interest to perform significant learning and to design teaching-learning activities.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122484074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seismo Radial Grain Velocity Fractal Dimension for Characterizing Shajara Reservoirs\u0000of the Permo-Carboniferous Shajara Formation, Saudi Arabia","authors":"K. Alkhidir","doi":"10.33140/jcerp.04.01.05","DOIUrl":"https://doi.org/10.33140/jcerp.04.01.05","url":null,"abstract":"The quality and assessment of a reservoir can be documented in details by the application of seismo radial grain\u0000velocity. This research aims to calculate fractal dimension from the relationship among seismo radial grain velocity,\u0000maximum seismo radial grain velocity and wetting phase saturation and to approve it by the fractal dimension\u0000derived from the relationship among capillary pressure and wetting phase saturation. Two equations for calculating\u0000the fractal dimensions have been employed. The first one describes the functional relationship between wetting\u0000phase saturation, seismo radial grain velocity, maximum seismo radial grain velocity and fractal dimension.\u0000The second equation implies to the wetting phase saturation as a function of capillary pressure and the fractal\u0000dimension. Two procedures for obtaining the fractal dimension have been utilized. The first procedure was done by\u0000plotting the logarithm of the ratio between seismo radial grain velocity and maximum seismo radial grain velocity\u0000versus logarithm wetting phase saturation. The slope of the first procedure = 3- Df (fractal dimension). The second\u0000procedure for obtaining the fractal dimension was determined by plotting the logarithm of capillary pressure versus\u0000the logarithm of wetting phase saturation. The slope of the second procedure = Df -3. On the basis of the obtained\u0000results of the fabricated stratigraphic column and the attained values of the fractal dimension, the sandstones of\u0000the Shajara reservoirs of the Shajara Formation were divided here into three units.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122624631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation Of Flow And Heat Transfer In Pipes With Surface Turbulators At\u0000Cross-Sections In The Frame Of Square (S/H=1) And Edge (S/H<<1) On The Basis\u0000Of Low-Reynolds Menter Theory","authors":"","doi":"10.33140/jcerp.04.01.03","DOIUrl":"https://doi.org/10.33140/jcerp.04.01.03","url":null,"abstract":"The study of the structures of the turbulent flow was mainly carried\u0000out by experimental methods, while the current computational studies\u0000on this topic are quite few and only partially devoted specifically\u0000to the structure of intensified flows; in part of the methods (for\u0000example), an integral approach to the problem under consideration\u0000is mainly used [1,2].","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116801718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-Reynolds Simulation of Heat Transfer in Turbulent Flow in a Flat Channel with\u0000Symmetrically Arranged Turbulators on Both Sides of the Channel","authors":"","doi":"10.33140/jcerp.04.01.04","DOIUrl":"https://doi.org/10.33140/jcerp.04.01.04","url":null,"abstract":"Widespread use in modern heat exchangers and apparatus received\u0000heat exchangers, where the channels have a cross-section, different\u0000from the round tubes, in a particular case, flat channels, where\u0000heat is not produced by means of a full surface to be washed. The\u0000thermal loading of a flat channel can be asymmetric, since the heat\u0000flows on different surfaces can be unequal, namely: flat channels\u0000with one-way heating or with two-way heating with unequal heat\u0000flows. In order to ensure the compactness of heat exchange devices\u0000and heat exchange apparatuses, heat transfer intensification is used,\u0000which in flat channels is achievable by two main methods: the\u0000development of the heat exchange surface and turbulence of the\u0000flow in the channels.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129821270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spectrophptometric Analysis of Clathromycin with Tpooo, Ars and WFB","authors":"","doi":"10.33140/jcerp.04.01.02","DOIUrl":"https://doi.org/10.33140/jcerp.04.01.02","url":null,"abstract":"One simple and sensitive procedure (simple spectrophotometric method) for the assay of drug clarithromycin in pure\u0000form and formulations. This method involves the formation of ion-association complex between CAM and the TPOOO,\u0000ARS and WFB. In order to establish the optimum conditions necessary for rapid and quantitative formation of coloured\u0000product with maximum stability and sensitivity, the author performed experiments by measuring the absorbance at\u0000λmax 480nm,420nm and580nm of respective series of solutions, varying one and fixing the other parameters in each\u0000case such as type, volume and concentration of acid, organic solvent used for extraction, ratio of organic phase to\u0000aqueous phase during extraction, shaking time and temperature. The variable parameters were optimized. The results\u0000were statistically validated.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130834326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Haldi, Lemon and Methi","authors":"","doi":"10.33140/jcerp.04.01.01","DOIUrl":"https://doi.org/10.33140/jcerp.04.01.01","url":null,"abstract":"High plasma lipids interact with free radicals in human body leading to develop coronary artery disease. We in\u0000this study have compared hypolipidemic effects of Fenugreek, Curcuma longa, and Lemon. Study was conducted\u0000at Jinnah Hospital Lahore-Pakistan from January 2016 to May 2016. Ninety hyperlipidemic patients of age group\u000019 to 70 were included in the study. Exclusion criteria were diabetic, alcoholic additives, hypertensive patients and\u0000those whose kidney or liver functions were impaired. Consent was taken from all participants. Their base line lipid\u0000profile was taken in biochemistry laboratory of the hospital. They were divided in three groups i.e. 30 patients in\u0000each group. Group-I was advised to take 500 mg of Curcuma longa (haldi) mixed in fresh milk without cream, thrice\u0000daily for two months. Group-II patients were advised to take 100 grams of Fenugreek leaves mixed with salad in\u0000each meal (thrice daily) for the period of two months. Group-III patients were advised to take 40 ml of fresh lemon\u0000juice mixed with 40 ml mineral water thrice daily for two months. They all were advised not to take heavy meal rich\u0000with any type of fat like junk food etc. One hour daily brisk walk was advised to all participants. 15 days follow up\u0000visit was scheduled for them. After two months their lipid profile was re-determined. When results were compiled\u0000and statistically analyzed by applying paired ‘t’ test, it revealed that Curcuma longa decreased total cholesterol, TG,\u0000LDL cholesterol 16.10, 20.01, and 17.59 mg/dl respectively. Fenugreek decreased total cholesterol, TGs, and LDL\u0000cholesterol 14.70, 17.33, and 17.06 mg/dl respectively. Lemon in two months therapy decreased total cholesterol,\u0000TGs, and LDL cholesterol 15.45, 10.13, and 11.97 mg/dl respectively. None of the above mentioned herbs raised\u0000HDL cholesterol significantly. It was concluded from this research work that Curcuma longa, Fenugreek leaves and\u0000Lemon are mild to moderately effective hypolipidemic herbs to lower total plasma cholesterol, triglycerides, and\u0000LDL cholesterol but have no potential to raise HDL cholesterol when analyzed biostatistically","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125051936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Method for Heterogeneous Sample Analysis on LCMS Without Sample Manipulation","authors":"M. Alimuddin, P. Richardson, Wen Wang, Brandon Phung, William Kim","doi":"10.26434/chemrxiv.9722576.v2","DOIUrl":"https://doi.org/10.26434/chemrxiv.9722576.v2","url":null,"abstract":"We describe a simple, effective, and\u0000automated method that tolerates heterogeneous sample analysis on liquid\u0000chromatography mass spectrometer (LCMS) systems without any sample\u0000manipulation. This was developed to mitigate the inconsistent sample\u0000preparations that often arise when LCMS systems are operated in a self-service\u0000mode (walkup or open access), such as in a pharmaceutical research environment.\u0000We demonstrated the robustness of our method\u0000through 144 sequential injections of a heterogeneous sample on the LCMS without\u0000observing clogging or an increase in the system pressure, whereas with a\u0000conventional set-up, the same sample resulted in an almost instantaneous clog.\u0000Analysis of carefully tracked metrics for six walkup LCMS over 3 years since\u0000the rollout of this method at our facility has shown > 95%\u0000sustained reduction in clogging rate, accompanied by over a 30-fold\u0000increase in operational robustness, all with no impact on the quality of the\u0000chromatography. Implementation has further lead to savings in time and\u0000resources for both the system administrators and users, hence making walk-up\u0000LCMS easier to use yet harder to break, with the additional benefit of\u0000providing data for heterogeneous samples available to the user, and reducing\u0000sample carry-over. The method is inexpensive to implement and requires neither\u0000expensive hardware such as pumps or valves, nor any changes to existing LCMS\u0000methods.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"427 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125881559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}