A clear light-yellow silver sol which has the visible spectral absorption at 390 nm, when adsorbed phenylmercaptotetrazole(PMT) or mercaptobenzothiazole(MBT), has a new absorption at 510-550 nm. It was found that the ...A clear light-yellow silver sol which has the visible spectral absorption at 390 nm, when adsorbed phenylmercaptotetrazole(PMT) or mercaptobenzothiazole(MBT), has a new absorption at 510-550 nm. It was found that the adsorption of halide ions competes with PMT and MBT. However, halide ions have a completely different influence from PMT and MBT on the spectral absorption of the silver sol. The differences may result from the change of the properties of the surface of the silver subcolloidal particles and from the bond forms combining adsorbates with the substrates.展开更多
This paper deals with the reclamation of mercury from the used silver oxide quartz wristwatch batteries employing leaching-cementation technique. The used batteries are first crushed to liberate the encapsulated activ...This paper deals with the reclamation of mercury from the used silver oxide quartz wristwatch batteries employing leaching-cementation technique. The used batteries are first crushed to liberate the encapsulated active material from the case which is leached in nitric acid to bring all metal contents into solution. After the removal of silver in the solution as silver chloride by precipitation, the mercury which is present as Hg2+ in the solution has been reclaimed through cementation with zinc dust. Various effects like zinc sheet and dust, zinc quantity, pH of the solution, duration and temperature have been carried out to standardise the conditions for maximum mercury reclamation. At a temperature of 45℃ and at 3.9 pH, 92.3% of mercury was recovered using 74 μm size zinc dust with purity greater than 99.78% and the same is characterized by XRF and the results are discussed.展开更多
In this paper is reported a new method of determining serum albumin with potentiometry. The silver ion selective electrode was used as working electrode and S. C. E as reference electrode. By controlling the ionic s...In this paper is reported a new method of determining serum albumin with potentiometry. The silver ion selective electrode was used as working electrode and S. C. E as reference electrode. By controlling the ionic strength, PH and temperature constant, a good linear relationship was obtained between the cell potential and albumin concentration. This method .possessed characters-of operating simplicity, rapidity and directness. The samples could be detected directly and the results were in accordance with the values detected by classic K method.展开更多
If one considers the number of language learners that are worldwide,the number of classroom-based language assessments(CBLAs)that are given each year,and the number of decisions that are made on the basis of these,it ...If one considers the number of language learners that are worldwide,the number of classroom-based language assessments(CBLAs)that are given each year,and the number of decisions that are made on the basis of these,it is obvious that in terms of sheer numbers,more students are affected by CBLAs per year than by those based on large-scale language assessments.Because of this,it is essential that classroom teachers have the knowledge,skills,and tools to enable them to develop and use CBLAs that they can justify to stakeholders,e.g.,students,parents,and school authorities.In this paper we describe the approach to CBLAs that we have developed.First,we discuss the role of assessment in teaching and learning,the kinds of decisions that classroom teachers need to make,and the different modes of CBLAs.We then describe the process of using CBLAs to help teachers make decisions that will have beneficial consequences.Next,we discuss fairness and accountability in assessment and the process of assessment justification,including an assessment use argument.Finally,we discuss the process of developing CBLAs,using an example of a classroom-based language assessment to illustrate this.展开更多
This work has demonstrated that with silver superlens, the resolution of conventional optical lithography can be improved significantly. Experimental and simulative results are given to verify the facts that the resol...This work has demonstrated that with silver superlens, the resolution of conventional optical lithography can be improved significantly. Experimental and simulative results are given to verify the facts that the resolution and the pattern fidelity are sensitive to the contact tightness between layers.展开更多
The recession's silver lining This isn’t an argument you hear every day,but if the recession did one thing for the under 35s,it boosted the appeal of going it alone and creating a startup.Most of us have at some ...The recession's silver lining This isn’t an argument you hear every day,but if the recession did one thing for the under 35s,it boosted the appeal of going it alone and creating a startup.Most of us have at some point dreamed of quitting the day job,but research into Generation Y workers finds that in 2015,up to 70 percent would rather start their own businesses than continue working for‘The Man,’despite ongoing economic uncertainty.With the security of regular day job diminished,the reasons to work for somebody else are fewer.For some,that makes risk of being your own boss seem a less daunting prospect.展开更多
当前语言测试研究重点已转向测试使用公平性论证。为确保语言测评开发与使用的公平性,测评开发者与使用者责任的起点和终点在哪里?如何将测评开发与使用责任做出明确区分?针对上述问题,本文试图运用AUA(Assessment Use Argument)框架阐...当前语言测试研究重点已转向测试使用公平性论证。为确保语言测评开发与使用的公平性,测评开发者与使用者责任的起点和终点在哪里?如何将测评开发与使用责任做出明确区分?针对上述问题,本文试图运用AUA(Assessment Use Argument)框架阐述测评开发者与使用者的责任,探讨不同利益相关者在测评开发和使用过程中的互动方式,并且联系TEM测评开发与使用进行前瞻性的思考。展开更多
文摘A clear light-yellow silver sol which has the visible spectral absorption at 390 nm, when adsorbed phenylmercaptotetrazole(PMT) or mercaptobenzothiazole(MBT), has a new absorption at 510-550 nm. It was found that the adsorption of halide ions competes with PMT and MBT. However, halide ions have a completely different influence from PMT and MBT on the spectral absorption of the silver sol. The differences may result from the change of the properties of the surface of the silver subcolloidal particles and from the bond forms combining adsorbates with the substrates.
文摘This paper deals with the reclamation of mercury from the used silver oxide quartz wristwatch batteries employing leaching-cementation technique. The used batteries are first crushed to liberate the encapsulated active material from the case which is leached in nitric acid to bring all metal contents into solution. After the removal of silver in the solution as silver chloride by precipitation, the mercury which is present as Hg2+ in the solution has been reclaimed through cementation with zinc dust. Various effects like zinc sheet and dust, zinc quantity, pH of the solution, duration and temperature have been carried out to standardise the conditions for maximum mercury reclamation. At a temperature of 45℃ and at 3.9 pH, 92.3% of mercury was recovered using 74 μm size zinc dust with purity greater than 99.78% and the same is characterized by XRF and the results are discussed.
文摘In this paper is reported a new method of determining serum albumin with potentiometry. The silver ion selective electrode was used as working electrode and S. C. E as reference electrode. By controlling the ionic strength, PH and temperature constant, a good linear relationship was obtained between the cell potential and albumin concentration. This method .possessed characters-of operating simplicity, rapidity and directness. The samples could be detected directly and the results were in accordance with the values detected by classic K method.
文摘If one considers the number of language learners that are worldwide,the number of classroom-based language assessments(CBLAs)that are given each year,and the number of decisions that are made on the basis of these,it is obvious that in terms of sheer numbers,more students are affected by CBLAs per year than by those based on large-scale language assessments.Because of this,it is essential that classroom teachers have the knowledge,skills,and tools to enable them to develop and use CBLAs that they can justify to stakeholders,e.g.,students,parents,and school authorities.In this paper we describe the approach to CBLAs that we have developed.First,we discuss the role of assessment in teaching and learning,the kinds of decisions that classroom teachers need to make,and the different modes of CBLAs.We then describe the process of using CBLAs to help teachers make decisions that will have beneficial consequences.Next,we discuss fairness and accountability in assessment and the process of assessment justification,including an assessment use argument.Finally,we discuss the process of developing CBLAs,using an example of a classroom-based language assessment to illustrate this.
基金the National Basic Research Program under Grant No.2004CB719801
文摘This work has demonstrated that with silver superlens, the resolution of conventional optical lithography can be improved significantly. Experimental and simulative results are given to verify the facts that the resolution and the pattern fidelity are sensitive to the contact tightness between layers.
文摘The recession's silver lining This isn’t an argument you hear every day,but if the recession did one thing for the under 35s,it boosted the appeal of going it alone and creating a startup.Most of us have at some point dreamed of quitting the day job,but research into Generation Y workers finds that in 2015,up to 70 percent would rather start their own businesses than continue working for‘The Man,’despite ongoing economic uncertainty.With the security of regular day job diminished,the reasons to work for somebody else are fewer.For some,that makes risk of being your own boss seem a less daunting prospect.
文摘当前语言测试研究重点已转向测试使用公平性论证。为确保语言测评开发与使用的公平性,测评开发者与使用者责任的起点和终点在哪里?如何将测评开发与使用责任做出明确区分?针对上述问题,本文试图运用AUA(Assessment Use Argument)框架阐述测评开发者与使用者的责任,探讨不同利益相关者在测评开发和使用过程中的互动方式,并且联系TEM测评开发与使用进行前瞻性的思考。
