“无机化学”课程教学全程化实施思政教育的探讨

课程思政是高校加强思政育人、坚持立德树人的重要途径,高校专业课程是实施课程思政的重要载体。在“无机化学”专业课程教学中,挖掘章节内容中所蕴含的思政元素,开展课程思政全程化教学的实践,并结合辅导和适时讨论,在传授专业知识的同时,引导学生树立正确的价值理念,激发学生的家国情怀和使命担当,使“无机化学”专业课程教学与思想政治理论教育实现有机统一,努力提高人才培养质量。

师范类高校“无机化学”课程思政建设探索

文章首先阐述了师范类高校“无机化学”课程思政建设现状,然后论述了师范类高校“无机化学”课程思政元素挖掘,最后提出了师范类高校“无机化学”课程思政建设策略。

“无机化学”教学中提高化学学科素养的策略

在化学学科教学过程中培养学生的核心素养,是培育优秀毕业生的重要举措,是学校立德树人教育目标的重要表现。化学作为一门联系生活的重要学科,如何优化和完善其课堂教学内容,培养学生的学科核心素养,已经成为高等院校化学教师亟待解决的问题。基于此,简要论述“无机化学”教学中提高化学学科核心素养的教学策略,以期为相关教育工作者提供经验借鉴和帮助。

基于课程思政的“无机化学”教学创新

文章首先阐述了“无机化学”课程概况,然后分析了“无机化学”教学存在的问题,接着论述了基于课程思政的“无机化学”教学创新,最后说明了基于课程思政的“无机化学”教学创新效果。

基于中学“新课改”的大学“无机化学”教学改革探索

伴随新一轮中学课程改革的全面展开,中学化学教学从内容和形式上都发生了很大变化,与之紧密衔接的大学“无机化学”教学改革需随之展开,结合“无机化学”教学实践,本文从知识、方法上总结了大学“无机化学”教学改革的经验及需解决的瓶颈问题.

“无机化学”中“原子结构”一章的教学探讨

针对“无机化学”课程特点和大一新生的具体情况,从三个方面对“无机化学”中“原子结构”一章的教学难点进行了深层次的梳理与辨析。通过绘制几张表格进行对比教学,使教学内容简明扼要化。提高了学生的学习兴趣和效果,达到了教学目的。

“无机化学”中“化学键与分子结构”一章的教学探讨

针对“无机化学”课程特点和新生的实际情况,从“力”与“形”两个方面对“无机化学”中“化学键与分子结构”一章的教学难点进行了深层次的梳理与辨析。运用一图十表对知识的难点和重点进行归纳、对比和总结,帮助学生更有效地掌握教学知识。

“碳中和”背景下“无机化学”课程设置的策略分析

“无机化学”作为化工、农学、医学、环境、食品、制药等专业的必修课程,对“碳中和”背景下不同专业人才的培养具有重要作用。分析“碳中和”背景下“无机化学”课程设置的策略,将“碳中和”理念融入“无机化学”课程培养体系,关注学生化学知识的获得、学习兴趣与研究能力的增强、实践能力与创新能力的提升,希望能合理更新“无机化学”课程体系,推动“碳中和”目标的实现。

基于课程思政理念的“无机化学实验”课程教学探究

为了完成"无机化学实验"课程立德树人的教学目标,基于课程思政的理念,从课程思政元素的挖掘、培养目标的确定、教学设计的融入及教学方法的改革和创新等方面入手,对该课程怎样有效融入课程思政进行了探讨,对有效实现该课程知识传授、技能培养、价值引领同向并行的"课程育人"作用具有一定的指导意义。

高中新课程改革后大学无机化学教学改革实践探析

随着社会的不断进步与发展,人们对教育改革越来越重视,高中化学与大学化学之间的差异有很大,如何做到让孩子们从高中化学适应到大学化学,这是各方学者、一线老师所研究的重要话题。根据《无机化学》的教学实践,我们对它进行了进一步的完善。据此,从教学基础上全面讲解《无机化学》教学带来的影响与意义。

PBL教学模式在“无机化学实验”中的探索与实践

“无机化学实验”是高等院校工农理科专业必修课程,也是化学类专业课程学习的重要内容。在“无机化学实验”教学过程中,采用项目式学习(PBL)教学模式,充分挖掘PBL教学模式的优势,结合“无机化学实验”课堂教学现状,将其融入实验教学,有助于培养学生的逻辑思维,调节课堂氛围,激发学生学习的主观能动性,强化学生的基本实验技能,转变学生的学习方式和学习态度,实现高等教育引领育人的教学目标。

INTEGRATED DESIGN OF AN ELECTRIC POWERED UNMANNED AIR VEHICLE USING CONCURRENT SUBSPACE DESIGN

The concurrent subspace design (CSD) framework has been used to conduct a preliminary design optimization of an electric powered, unmanned air vehicle (EPUAV) operating at a low Reynolds number. A multidisciplinary system analysis that includes aerodynamics, weights, propulsion, performance and stability and control has been developed for this class of vehicles. The CSD framework employs artificial neural network based response surfaces to provide approximations to the design space. The EPUAV system includes 25 continuous and 4 discrete design variables. The CSD framework was able to identify feasible designs with significant weight reductions relative to any previously considered (i.e. initial database) designs. This was accomplished with a limited number of system analyses. The results also demonstrate the nature of this design framework adaptive to changes in design requirements.

Mechanism of Chrome-free Tanning with Tetra-hydroxymethyl Phosphonium Chloride

Tetra-hydroxymethyl phosphonium chloride （THPC） has been considered as an important chrome-free tanning agent. To understand the THPC tanning mechanism, the structure, charge distribution, activity and tanning ability of each phosphorous compound in THPC tanning system were studied, by ^31p NMR, FT-IR spectroscopy, differential scanning calorimetry （DSC） and computational chemistry method, etc. When pH raised to 6.0, the decomposition of THPC would take place, which results in a production of free formaldehyde, tri-hydroxymethyl phosphonium （TrHP） and tri-hydroxymethyl phosphine oxide （TrHPO）. At pH 9.0, THPC will be converted completely to TrHP and most TrHP is further oxidized into TrHPO. It is possible that, in reaction of phosphorous compounds and collagens, both P-C and C-O bonds would break simultaneously or individually. From molecular charge distribution and bond polar properties, it is deduced that, if P-C bonds break, the activity is in order of TrHPO 〉 THPC 〉 TrHE whereas if C--O bonds break, the order is TrHP 〉 THPC 〉 TrHPO. It is more possible that P--C bonds will break in reaction with collagen, and TrHPO may be more active in the THPC tanning system. The results of tanning and DSC also prove the above conclusion. Furthermore, the fact that the shrinkage temperature of THPC tanned leather was below 70℃ when basified to pH 5.0 or lower suggests that the hydroxymethyl groups of THPC and TrHP are less possible to combine directly with amino groups of collagen.

Effect of Continuous Vegetable Cultivation on Phosphorus Levels of Fluvo-Aquic Soils

Soil P status, inorganic P fractions, and P sorption properties were studiedusing sandy fluvo-aquic horticultural soils, which are high in organic matter content for vegetableproduction in comparison with a soil used for grain crop production in Zhengzhou, Henan Province,China P fractions, Olsen-P, and OM were determined at different depths in the soil profile andsorption isotherm experiments were performed Most P in excess of plant requirements accumulated inthe topsoil and decreased with soildepth. Total P, inorganic P, and OM concentrations increased withcontinued horticultural use Olsen-P concentrations in the 0-20 cm depth of horticultural soils were9 to 25 times higher than those of the grain crop soil. A linear transformation of the Langmuirequation showed that the P adsorption maximum (491.3 mg P kg^(-1)) and the maximum phosphatebuffering capacity (162.1 L kg^(-1)) for 80--100 cm were greater in the grain crop soil than thehorticultural soils. Thus, the most immediate concern with excess P were in areas where heavy Pfertilizer was used for vegetable crops and where soil P sorption capacities were low due to sandysoils and high organic matter content.

Photochemical production of dissolved inorganic carbon from suwannee river humic acid

The photochemical mineralization of dissolved organic carbon(DOC) to dissolved inorganic carbon(DIC) is a key process in carbon cycling.Using a Suntest CPS solar simulator,Suwannee River humic acid(SRHA) was photooxidated to examine the effects of O2 levels,the wavelength of incident light,and the concentration of Fe on the photoproduction of DIC.Increasing the O2 abundance enhanced photodegradation of SRHA.The rate of DIC photoproduction under air saturation in the first 24 h(4.40 μmol/(L h)) was increased by a factor of 1.56 under O2 saturation,but fell by only 36% under N2 saturation.To evaluate the relative importance of UV-B,UV-A,and visible radiation in the photodegradation,we examined the above process using Mylar-d films and UF-3 and UF-4 plexiglass filters.The results indicated that the UV-B,UV-A and visible wavelengths accounted for 31.8%,32.6% and 25.6%,respectively,of DIC production with simulated sunlight irradiation.The above results also indicated that photoproduction of DIC could take place in natural water at depths greater than those that UV light can reach.When 20 μmol/L desferrioxamine mesylate(DFOM,a strong Fe complexing ligand) was added,the rate of DIC photoproduction fell to 55.6% that of the original SRHA samples with 5.46 μmol/L Fe.

Relationships Between Agronomic and Environmental Soil Test Phosphorus in Three Typical Cultivated Soils in China

A study was conducted to determine the relationships between agronomic soil test P and environmental soil test P in three soils predominately distributing in three typical agricultural production areas of China. Soil P was analyzed using Bray-1 （BP）, Olsen （OP）, and Mehlich-3 （MP） methods as agronomic tests, and using Fe-oxide impregnated filter paper （FeP）, anion-exchange resin membrane （RP）, and water （WP） as environmental tests. There were linear relationships between soil P extractable with all the tests evaluated. The regression coefficients, R^2, ranged from 0.8164 to 0.9409 between each two of the agronomic soil test P, and ranged from 0.4702 to 0.8990 between each two of the environmental soil test P, when the three soils were considered separately. When soil test P was analyzed across all the three soils, the highest regression R^2 was found between OP and MP （0.7940） amongst agronomic soil test P, and between FeP and RP amongst environmental soil test P （0.8842）. While all of the three agronomic soil test P was linearly related to each of the environmental soil test P across the three soils, strongest relationships were found between OP and environmental soil test P. Agronomic OP may be adopted as an analytical tool for environmental prediction of soil P.

Preparation of tricalcium silicate and investigation of hydrated cement

Tricalcium silicate cement(TSC)has been widely used in dental materials because of its self-setting behavior,good bioactivity,biocompatibility,osteoinductivity,and antibacterial effect.Tricalcium silicate(C3S)powder was prepared by Pechini technique with a calcining temperature of 1300℃ for 3 h.The influence of liquid/powder(L/P)rate on the setting time and the mechanical property of TSC was studied.Characterization methods including XRD,FTIR,SEM-EDS,TEM,and ICP-AES were utilized to study the properties of C3S powder and its hydrated cement.The bioactivity and biocompatibility of the cement were investigated by soaking test and cell culture,respectively.The results show that the L/P rate plays an important role in the setting time and the compressive strength of TSC.The surface of TSC was covered by hydroxyapatite deposition during the immersion experiment and the cells attachment on the surface of TSC was well,which indicated that TSC has good bioactivity and biocompatibility.In addition,TSC has excellent antibacterial properties against Staphylococcus aureus.In conclusion,TSC is a promising candidate for root canal filling materials.

New Method for Desalination of Seawater

The present study explores the possibility of appealing to the laws of inorganic chemistry, i.e., the rules of precipitation to desalinate seawater. Historically, the industry has been using these techniques for the preparation of some compounds. Based on these rules, using suitable salts will react with each other. The results are evident all unwanted salts including sodium chloride are removed. In fact, it is a selective precipitation as other salts which are not harmful are kept such as potassium. The other aim of the study is to reduce the current ratio desalination/power which is very high 60,000 to 80,000 cal/L for distillation （A. Payant. P. Chiliotti L. Sainte-Marie Physic Arm and Colin, Paris, France） or 4.5 kWh/m3 for RO （desalination and water reuse, California, USA） a cause of greenhouse gas except desalination using solar energy. Another aspect of this study, authors noticed rather than consume energy, regeneration or recycling of products provides energy. And in addition, the operation does not cause any pollution.

Species and distribution of inorganic selenium in the Bohai Sea

For studying geochemical behavior of selenium, a marine investigation was conducted in September 1998 cruise in the Bohai Sea. Horizontal and vertical distributions of inorganic selenium and selenite were studied. The inorganic selenium varied from 0.73 to 2.41 nmol/L, with an average of 1.31 nmol/L; while selenite varied from 0.18 to 0.72 nmol/L with an average of 0.47 nmol/L. The average ratio of selenite to selenate was 0.68, and selenate was the predominant species of inorganic selenium in the most study area. Concentrations of inorganic selenium and selenite decreased with distance from the coast. No apparent variations of the concentration between surface and bottom was shown. There were two wa- ter masses in the area, one from the Huanghe (Yellow) River and other from the Yellow Sea. Of the two, Huanghe River was the major source of inorganic selenium.

Advances in the Marine Photochemistry of Some Important Transition Metal Elements

Marine inorganic photochemistry, as one of the important branches of marine chemistry, is significantly connected with marine biology, marine ecology, marine geochemistry and marine environment, and plays an important role in the development of marine sciences. To date, lots of investigations in the field have been conducted home and abroad. As for the following development of marine inorganic photochemistry, it is greatly of significance to summarize these research works. This paper detailedly summarizes the present research progress in the photochemistry of Fe, Mn and Cu, with an emphasis on investigations on photochemical processes which could affect existing forms of these metal elements in seawater. The problems and shortcomings in the study field are pointed out and some suggestions for the future study are put forward.