Repräsentative Vorkrümmungen e0 für das Biegeknicken – Ergänzende Untersuchungen

Equivalent geometrical initial bow imperfections e₀ for flexural buckling – additional investigations. According to Eurocode 3 Part 1‐1, a member subjected to an axial compression force may be verified by two different approaches: a verification by the equivalent member method or a cross sectional verification. Concerning the second possibility bending moments according to second order theory must be calculated, where initial bow imperfections e₀ must be taken into account, which should be taken normally from EN 1993‐1‐1, table 5.1. The values e₀ used up to now should be changed, because they are partly unsafe, this was shown earlier by intensive investigations [5]. The results of additional investigations are explained here concerning test results and analytical values for high strength steel S700. Furthermore comments are given to values e₀ calculated depending on the non‐dimensional slenderness λ .     

岩盐水溶开采后期开采技术的探讨

本文以长山盐矿为例，通过对大面积连通采区（岩盐水溶开采后期）的溶腔水动态分析，结合生产实验，通过理论分析和实践，提出了岩盐水溶开采后期开采后期开采经济运行及提高采出率等技术措施，并运用于实中中，取得了良好的效果。     

Reduction Behaviour of BOF Slags by Carbon in Iron

Experiments were carried out in a system with BOF slags from industrial operations in order to optimize the conditions of recycling BOF slags produced in the steelmaking process. Reduction reactions of FeO and P₂O₅ proceeded steadily and the FeO reduction rate was almost identical to that of P₂O₅. The reduction reaction of FeO and P₂O₅ in BOF slag at the slag/gas interface is the rate‐controlling step. The reaction rates of FeO and P₂O₅ by dissolved carbon in molten iron are of first order with respect to their respective concentrations. The reduction reactions of FeO and P₂O₅ by dissolved carbon in iron are much closer to the equilibrium state compared with the reduction by solid carbon. It is necessary to control the portion of phosphorus vaporization during reduction treatment in order to obtain efficient operational conditions for BOF slag reduction.     

Membranbrennstoffzellen

With the development of polymer membranes suitable as proton‐conducting electrolytes, membrane fuel cells are now successfully applied in various areas. Depending on the application, the service life, the power density or other system aspects are optimized. Common to all applications is the requirement to reduce costs, which, however, plays a decisive role especially in passenger cars. The development of the membrane fuel cell has now reached a high technical level, but political flanking measures are still required to launch it on the market. This applies both to the hydrogen infrastructure for fuel cell vehicles and to the promotion of fuel cell‐based combined heat and power generation.     

《化工单元操作》教学改革的新思路

根据高职教育的特点和要求,制定了与教学现状相适应的教改目标、教改原则,并提出了意在强化学生的生产实践能力和提高学生的职业综合素质的课程改革新思路.     

蛋白酶抑制剂对苏云金杆菌晶体毒素活性的影响

综述了蛋白酶抑制剂对苏云金杆菌晶体毒素(B.t.Cry)活性影响的最新研究进展.蛋白酶抑制剂降低中肠中蛋白酶活性,这不仅影响B.t.cry原毒素的活化,而且延缓B.t.Cry毒素的水解失活.蛋白酶抑制剂对B.t.Cry毒素协同作用取决于这2种作用的均衡.     

p(t)-Laplace方程解的存在性

p-Laplace方程是一类椭圆微分方程,它描述了化学和物理中一类稳定的反映扩散现象.当p=2时,p-Laplace方程为经典的Laplace方程,p(t)-Laplace方程可以用来描述"逐点异性"的物理现象,p(t)-Laplace算子比p-Laplace算子有更复杂的非线性性质.方程解的存在性问题是微分方程中讨论较多的问题.利用Banach空间中的理论证明了一类p(t)-Laplace方程在一定条件下解的存在性.     

石灰石在转炉中与铁水相互作用研究

根据热力学基础理论研究了CO2-CO气体与Fe—C—Si—Mn体系之间反应以及铁水中[C]对Ca-CO3分解温度的影响．结果表明,在气氛组成变化很宽的范围内,CO2与[C]、[Si]、[Mn]、Fe（1）反应的AG小于零,石灰石分解产生的部分CO：可以替代氧气参与熔池的氧化．气氛组成影响CO：对铁水中元素的氧化顺序．CO：浓度高CO浓度低时,CO2优先氧化[C];CO2浓度低CO浓度高时,CO2优先氧化[Si]．在w[C]=2％～4．5％的范围内,石灰石分解温度T与w[C]％的关系为T=2．40w[C]2%-35．91w[C]%＋1129．1．将石灰石煅烧过程从传统石灰窑中转移到转炉可显著降低石灰石分解温度．CaCO3的分解反应和CO2对熔池的氧化反应互相促进,有利于石灰石的分解和铁水中杂质元素的氧化去除．     

Notwendigkeit und Vermarktung von Flexibilitätsoptionen im Energiesystem der Zukunft

Demands on production, distribution and consumption of electrical energy change fundamentally with the energy revolution. Energy purchasing costs for inflexible consumers are rising and proceeds of inflexible producers are sinking. Companies are able to reduce costs by marketing operational flexibility options. This article sets out the need of flexibility in the energy system and the new marketing options. Flexibility potentials within infrastructure plants of a chemical park are analyzed, evaluated regarding marketing and activated in the presented research project FlexChemistry.     

Molecular Mechanisms to Control Post-Transplantation Hepatitis B Recurrence

Hepatitis B often progresses to decompensated liver cirrhosis requiring orthotopic liver transplantation (OLT). Although newer nucleos(t)ide analogues result in >90% viral and hepatitis activity control, severely decompensated patients still need OLT because of drug-resistant virus, acute exacerbation, or hepatocellular carcinoma. Acute hepatitis B is also an indication for OLT, because it can progress to fatal acute liver failure. After OLT, the hepatitis B recurrence rate is >80% without prevention, while >90% of transplant recipients are clinically controlled with combined hepatitis B immunoglobulin (HBIG) and nucleos(t)ide analogue treatment. However, long-term HBIG administration is associated with several unresolved issues, including limited availability and extremely high cost; therefore, several treatment protocols with low-dose HBIG, combined with nucleos(t)ide analogues, have been investigated. Another approach is to induce self-producing anti-hepatitis B virus (HBV) antibodies using an HBV envelope (HBs) antigen vaccine. Patients who are not HBV carriers, such as those with acutely infected liver failure, are good candidates for vaccination. For chronic HBV carrier liver cirrhosis patients, a successful vaccine response can only be achieved in selected patients, such as those treated with experimentally reduced immunosuppression protocols. The present protocol for post-OLT HBV control and the future prospects of newer treatment strategies are reviewed.