In-situ electrochemical study on the eff ects of Fe(Ⅲ)on kinetics of pyrite acidic pressure oxidation

Fe(Ⅲ)has been proved to be a more eff ective oxidant than dissolved oxygen at ambient temperature,however,the role of Fe(Ⅲ)in pyrite acidic pressure oxidation was rarely discussed so far.In this paper,in-situ electrochemical investigation was performed using a flow-through autoclave system in acidic pressure oxidation environment.The results illustrated that increasing Fe(Ⅲ)concentrations led to raising in redox potential of the solution,and decreased passivation of pyrite caused by deposition of elemental sulfur.Reduction of Fe(Ⅲ)at pyrite surface was a fast reaction with low activation energy,it was only slightly promoted by rising temperatures.While,the oxidation rate of pyrite at all investigated Fe(Ⅲ)concentrations increased obviously with rising temperatures,the anodic reaction was the rate-limiting step in the overall reaction.Activation energy of pyrite oxidation decreased from 47.74 to 28.79 kJ/mol when Fe(Ⅲ)concentration was increased from 0.05 to 0.50 g/L,showing that the reaction kinetics were limited by the rate of electrochemical reaction at low Fe(Ⅲ)concentrations,while,it gradually turned to be diffusion control with increasing Fe(Ⅲ)concentrations.

Logistics Mode and Network Planning for Recycle of Crop Straw Resources

To realize the straw biomass industrialized development,it should speed up building crop straw resource recycle logistics network, increasing straw recycle efficiency,and reducing straw utilization cost. On the basis of studying straw recycle process,this paper presents innovative concept and property of straw recycle logistics network,analyses design thinking of straw recycle logistics network,and works out straw recycle logistics mode and network topological structure. Finally,it comes up with construction and operation strategies of the straw logistics network from infrastructure,organization network,and information platform.

Clinical Report on the Treatment of Post-stroke Cognitive Impairment Based on Microbe-Gut-Brain Axis Theory

Based on the close relationship between MGBA and PSCI,one PSCI related case is reported,and it is emphasized to improve clinicians'understanding of MGBA theory in the treatment of PSCI,thereby providing new ideas for exploring pathogenesis and treatment of PSCI.

A Classic Case of Dialectical Treatment of Diabetes Complicated with Diarrhea in the Elderly

As a common chronic disease of the elderly,diabetes endangers both physical and mental health of the elderly.Diarrhea is a common complication of diabetes and causes great inconvenience to patients’daily life.Professor Zhou Lingyun from Chief Physician,Department of Geriatrics,Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine has been engaged in clinical practice for many years and is good at treating miscellaneous diseases in geriatric internal medicine.She has unique thinking and experience in the diagnosis and treatment of diabetic diarrhea.Professor Zhou Lingyun believed that the pathogenesis of diabetic diarrhea in the elderly is the deficiency of spleen and stomach qi and dampness.She is good at using Modified Sijunzi Decoction to nourish qi,invigorate the spleen and dispel dampness,so as to treat diabetic diarrhea.This paper introduced and analyzed a classic case of Professor Zhou Lingyun’s treatment of diabetic diarrhea in the elderly.

Enhancing energy storage density of poly(arylene ether nitrile)via incorporating modified barium titanate nanorods and hotstretching

Dielectric energy storage materials that are extensively employed in capacitors and other electronic devices have attracted increasing attentions amid the rapid progress of electronic technology.However,the commercialized polymeric and ceramic dielectric materials characterized by low energy storage density face numerous limitations in practical applications.In this study,we report the simultaneous enhancement of dielectric properties of poly(arylene ether nitrile)(PEN)through the incorporating of sulfonated PEN(SPEN)modified barium titanate nanorods(BTNR)(SPEN@BTNR)and hot-stretching.BTNR is synthesized using a two-step hydrothermal method,aminated with KH550,and then reacted with SPEN to form the cladding-modified SPEN@BTNR.Due to the intrinsic high permittivity of barium titanate(BT)and enhanced compatibility between SPEN@BTNR and PEN stemming from the cladding of SPEN,the dielectric constant and breakdown strength of SPEN@BTNR/PEN composite are as high as 14.0 at 103 Hz and 198.1 kV/mm at the doping amount of 15 wt.%,respectively.As a result,the energy storage density of SPEN@BTNR/PEN is increased to 2.43 J/cm^(3),compared with that of 0.82 J/cm^(3)for PEN.In addition,derived from the rearrangement of SPEN@BTNR and orientation of PEN after hot-stretching,the dielectric constant and breakdown strength of SPEN@BTNR/PEN with 15 wt.%fillers are further enhanced to 17.1 and 204.8 kV/mm,respectively,resulting in an energy storage density of 3.36 J/cm^(3).The boosting of energy storage density up to 310%provides a new idea for improving the performances of dielectric energy storage materials.

Robust trajectory planning for UAV communication systems in the presence of jammers

Unmanned Aerial Vehicle(UAV)has emerged as a promising novel application for the Sixth-Generation(6G)wireless communication by leveraging more favorable Line-of-Sight(Lo S)propagation.However,the jamming resistance by exploiting UAV’s mobility is a new challenge in the UAV-ground communication.This paper investigates the trajectory planning problem in an UAV communication system,where the UAV is operated by a Ground Control Unit(GCU)to perform certain tasks in the presence of multiple jammers with imperfect power and location information.To ensure the reliability of the GCU-to-UAV link,we formulate the problem as a non-convex semi-infinite optimization,aiming to maximize the average worst-case Signal-toInterference-plus-Noise Ratio(SINR)over a given flight duration by designing the robust trajectory of the UAV under stringent energy availability constraints.To handle this problem efficiently,we develop an iterative algorithm for the solution with the aid of S-procedure and Successive Convex Approximation(SCA)method.Numerous results demonstrate the efficacy of our proposed algorithm and offer some useful design insights to practical system.

英国住宅性房地产税制度介绍及经验借鉴

英国住宅性房地产税在房产保有环节征收,属于典型的地方税种。本文主要介绍了英国住宅性房地产税的政策背景,以及包含纳税义务人、房产估值办法、价值等级及税率、减免政策、空置住宅等在内的制度框架。在此基础上,从坚持税收法定、合理设置价值等级、加强房地产税收针对性和导向性、给予地方政府自主权限等方面总结了可供我国房地产税改革借鉴的经验。

Cu_(2)O-SupportedAtomicallyDispersed Pd Catalysts for Semihydrogenation of Terminal Alkynes: Critical Role of Oxide Supports

Atomically dispersed catalysts have demonstrated superior catalytic performance in many chemical transformations.However,limited success has been achieved in applying oxide-supported atomically dis-persed catalysts to semihydrogenation of alkynes under mild conditions.

In Situ-Induced Multivalent Anticancer Drug Clusters in Cancer Cells for Enhancing Drug Efficacy

Increasing intracellular drug concentration is an effec-tive way for cancer chemotherapeutics to enhance efficacy and combat drug resistance.In this work,a series of anticancer drug conjugates were prepared by linking thiol-modified oligo(p-phenylene viny-lene)with paclitaxel,vincristine,teniposide,tamoxi-fen,doxorubicin,or podophyllotoxin(OPV-S-Drugs)through a Michael addition reaction.

Homogeneous nanoparticle dispersion prepared with impurity-free dispersant by the ball mill technique

The homogeneous dispersion of nanoparticles in solvents or polymer matrices is essential for prac- tical application of nanocomposites. In this study, the planetary ball milling technique was used to de-agglomerate silica nanoparticles in butyl acetate. The size of the nanosilica aggregates was evalu- ated by TEM and SEM. With the addition of polyacrylate polymer to the organic solvent, the nanoparticle agglomerates were effectively broken up by planetary ball milling at the proper milling time; however, re-agglomeration occurred after a longer milling time. The results of TGA and FTIR indicated that the polyacrylate molecules could be adsorbed in situ onto the nanoparticles. Behaving similar to a dispersant, the adsorbed polyacrylate reduced the blend viscosity significantly and prevented re-agglomeration of the nanoparticles. Utilizing the polyacrylate polymer both as the dispersant and the polymer matrix, the polyacrylate-based nanocoatings were further prepared. The optical transmittance and haze value of the nanocoatings were found to be sensitive to the dispersion level of the nanoparticles, and the elastic mod- ulus and hardness of the nanocoatings were improved in comparison with those of the neat polymer coating.

The origin of the site preference of H adsorption on Pd(100)

Spin-polarized density functional theory （DPT） calculations are carried out to determine the site preference of H adsorption on Pd（100） surface and subsurface, We carefully scrutinize the energy difference between different patterns at θ=0.50 ML and confirm the LEED observation that surface adsorption can form c（2×2） ordering structure. On the contrary, we disclose that p（2×1） structure become more favorable than c（2×2） for subsurface adsorption. These site preferences are rationalized via an analysis of the layer and orbital resolved density of states. Furthermore, we propose that the interstitial charge as a key factor determining the preferred H adsorbed site.