分层跨链结构:一种面向区块链系统监管的可行架构

研究区块链监管存在的问题是至关重要的。鉴于此,提出了一种分层跨链的监管架构(CHA),设计了“监管链-业务链”跨链协作的以链治链的监管模式。该架构以构建去中心化的监管链的方式改善了信息系统监管的集权特性;以策略层和监管层、业务层分离的方式,实现了监管行为和监管技术的分离,从而保证了区块链监管结构的通用性。最后,通过形式化分析方法论证了该架构的分布式可行性,进而证明了方案在跨链监管可靠性方面的技术可行性、适用于不同监管业务的通用可行性及可扩展性。

Novel Analysis of Two Kinds Hybrid Models in Ferro Martial Inserting Variable Lorentz Force Past a Heated Disk:An Implementation of Finite Element Method

In this article,the rheology of Ferro-fluid over an axisymmetric heated disc with a variable magnetic field by considering the dispersion of hybrid nanoparticles is considered.The flow is assumed to be produced by the stretching of a rotating heated disc.The contribution of variable thermophysical properties is taken to explore themomentum,mass and thermal transportation.The concept of boundary layermechanismis engaged to reduce the complex problem into a simpler one in the form of coupled partial differential equations system.The complex coupled PDEs are converted into highly nonlinear coupled ordinary differential equations system(ODEs)and the resulting nonlinear flow problem is handled numerically.The solution is obtained via finite element procedure(FEP)and convergence is established by conducting the grid-independent survey.The solution of converted dimensionless problem containing fluid velocity,temperature and concentration field is plotted against numerous involved emerging parameters and their impact is noted.From the obtained solution,it is monitored that higher values of magnetic parameter retard the fluid flow and escalating values of Eckert number results in to enhance temperature profile.Ferro-fluid flow and heat energy for the case of the Yamada Ota hybrid model are higher than for the case of the Hamilton Crosser hybrid model.Developing a model is applicable to the printing process,electronic devices,temperature measurements,engineering process and food-making process.The amount of mass species is reduced vs.incline impacts of chemical reaction and Schmidt parameter.

Prussian blue and its analogues as advanced supercapacitor electrodes

Remarkable attention has been directed to Prussian blue(PB) and its analogues(PBA) as one of the most widely used metal-organic frameworks(MOFs) especially in the field of energy storage devices due to their fabulous features such as 3D open framework, high surface area, controllable distribution of pores and the low cost. Nevertheless, their depressed conductivity causes some insulation when being used as an electrode for supercapacitors leading to be restricted in further applications particularly the electronics. To the best of our knowledge, our review aimed primarily to give a total picture of the research that was done on utilizing PB and PBA for fabricating the electrodes of supercapacitor, studying their synthesis approaches in addition to the hybridization with other materials such as graphene, CNTs and conducting polymer. It also addresses the transformation of PB or PBA into other interesting nanostructures such as oxides, sulfides, and bicomponent of graphitic carbon nitride/metal oxides, as well. Furthermore,It exhibits various avenues for overcoming their disadvantages of bad cycle life, retention rate and not achieving the desired values of energy/power densities opening the door for enlarging the number of researches on their application as supercapacitors.

Numerical Solutions for Heat Transfer of An Unsteady Cavity with Viscous Heating

The mechanism of viscous heating of a Newtonian fluid filled inside a cavity under the effect of an external applied force on the top lid is evaluated numerically in this exploration.The investigation is carried out by assuming a two-dimensional laminar in-compressible fluid flow subject to Neumann boundary conditions throughout the numerical iterations in a transient analysis.All the walls of the square cavity are perfectly insulated and the top moving lid produces a constant finite heat flux even though the fluid flow attains the steady-state condition.The objective is to examine the effects of viscous heating in the fully insulated lid-driven cavity under no-slip and free-slip Neumann boundary conditions coupled with variations in Reynolds and Prandtl numbers.The partial differential equations of time-dependent vorticity-stream function and thermal energy are discretized and solved using a self-developed finite difference code in MATLAB®environment.Time dependence of fluid thermodynamics is envisaged through contour and image plots.A commercial simulation software,Ansys Fluent®utilizing a finite element code is employed to verify the finite difference results produced.Although the effect of viscous heating is very minimal,Neumann no-slip and free-slip boundary conditions are able to trap the heat inside the fully insulated cavity as the heat flux is constantly supplied at the top lid.A lower Reynolds number and a greater Prandtl number with free-slip effects reduce temperature distribution in the cavity with a faster velocity than in the no-slip condition as the free-slip behaves as a lubricant.

In vivo laxative, anti-diarrheal, hepatoprotective and diuretic investigations of Sterculia diversifolia and its isolated compounds

OBJECTIVE:To investigated the laxative,anti-diarrheal,hepatoprotective and diuretic activity of Sterculia diversifolia and its isolated compounds.METHODS:The laxative activity was studied by counting wet stools while anti-diarrheal activity was performed by measuring gastrointestinal tract motility.Hepatoprotective activity was studied by biochemical and histo-pathological analysis while diuretic activity was performed by urine collection protocol.RESULTS:Doses of 30 and 100 mg/kg of crude methanolic extract of Sterculia diversifolia(MESD)stem bark and leaves,significantly(P<0.05,P<0.01)produced wet feces in subjects pretreated with atropine while 8-hydroxyquercetin and dihydroquercetin showed highly significant(P<0.001)results by increasing fecal weight and water contents without producing diarrhea.MESD stem bark and leaves also dose-dependently lowered diar-rhea while 8-hydroxyquercetin and dihydroquercetin showed highly significant(P<0.001)results by producing shaped stools in mice.MESD,8-hydroxyquercetin and dihydroquercetin offered significant protection against histopathological changes in the liver.Diuretic activity of Crude MESD stem bark and leaves extracts shows highly significant diuretic effect while dihydroquercetin showed better results than 8-hydroxyquercetin.CONCLUSION:It is concluded that Sterculia diversifolia and its isolated compounds bears laxative,anti-diarrheal,hepatoprotective and diuretic effects.

Non-superimposable mirror image crystals of enantiomers by spontaneous resolution and the chiral discrimination mechanism

周期的 -alkenyl 酒精(2 ) 的两 enantiomers (S/R ) 的 Non-superimposable 镜像晶体被肉眼认出了并且显著地识别了。更有趣地，两水晶极度是大多数的结果 H 契约和分子间的 / 相互作用。他们与光纯净说明了相对稀罕、不太可预言的自发的决定 > 从外消旋的混合的 99% ee。这个自发的决定的 chiral 辨别机制也被建议了。

Proximate composition and elemental analysis in soft tissues of freshwater mussels （Anodonta anatina） from the Chashma Lake, River Indus Pakistan

背景水的无脊椎动物在对水沾染物的评价正在起一个重要作用并且也用作食物链的一个主要部件。淡水贻贝被认为是水的环境的好 bioindicator 种类并且广泛地过去常决定金属负担。方法贴近的作文和元素的分析被执行在可食(脚，披风) 并且淡水贻贝(Anodonta anatina ) 的非可食的部分(鳃) 从查什马·莱克，的各种各样的地点收获了河印度河巴基斯坦。结果营养的部件在发现是为消费的最好的部分的学习部分和肌肉发达的脚之中被改变。蛋白质和胖内容在脚里是显著地更高的(15.90 猠慴汢? 敧敮猠汩湥楣杮洠摥慩整 ? 祢 ?? 洠瑥票慬楴湯椠 ? 卅獃琠? 汦硥扩敬朠湥 ? 敲牰獥楳湯映捡汩瑩瑡摥戠 ? 敲牰獥楳敶栠獩潴敮洠摯晩捩瑡潩獮椠 ? 潳慭楴?散汬 吗？