SAXS study of the lamellar-cylindrical transition in the PI-b-P2VP(OG) supramolecules' system

A detailed SAXS study of self-assembled block copolymer-based supramolecules composed of a polyisoprene-block-poly(2-vinylpyridine) diblock copolymer and octyl gallate that is hydrogen bonded to the vinylpyridine block in a stoichiometric ratio is presented. The changes in the system morphology with temperature are investigated both at rest and under oscillatory shear. In between the lamellar-to-cylindrical transition a new intermediate structure, identified as a deformed hexagonal structure (DHS), was observed. Being at rest the DHS is argued to consist of ellipsoidal cylinders that adopt a more regular circular shape when the sample is subjected to shear. These results are discussed in terms of hydrogen bond breaking under shear.     

Transmutation of long-lived radioactive waste based on double-strata concept

A considerable attention is directed toward the reduction in the long-term potential hazard by partitioning and transmutation (P-T): separating long-lived nuclides from the waste stream and converting them into either shorter-lived or non-radioactive ones. The effects of higher Pu and minor actinide (MA) compositions on the transmutation rates have been studied for a typical mixed oxide (MOX)-fuel fast breeder reactor (FBR) core with 2600 MWt. The calculations showed that the transmutation rate for (Pu, MA) compositions from MOX -LWR becomes one half than that from UO₂-light water reactor (LWR). Furthermore, MA accumulation and transmutation based on Double-Strata Scenario have been investigated for introducing the accelerator driven transmutation system (ADS) with 800 MWt. It was shown that in the scenario of nuclear plant capacities for maximum 140 GWe, which consists of LWRs and FBRs, the introduction of ADS can play a significant role as “Transmuter” in the back-end of fuel cycle.     

Evaluating Bank Filtration as an Alternative to the Current Water Supply from Deeper Aquifer: A Case Study from the Pannonian Basin,Serbia

Groundwater from a depth of 100–200 m is the main source of public water supply in most municipalities in the Pannonian basin in central and southeastern Europe. Even though its quality does not always meet EU standards for drinking water—including those regarding arsenic—in many villages and even in some major cities no treatment except chlorination takes place. Of the several alternatives to improve the water supply situation in the Autonomous Province of Vojvodina in the northern part of the Republic of Serbia, re-orientation towards more centralized systems combined with river bank filtration as an additional and sustainable raw water resource was evaluated as the best. A hydrogeological and hydrochemical survey of the Tisa (or Tisza) River alluvium in the Padej test field confirmed the aptness of this approach. A good connection between the Tisa River bed and the alluvial aquifer consisting of fine-grained sand was found (average hydraulic conductivity of 5 × 10⁻⁵ m/s). With appropriately designed and managed wells, 80–100 l/s bank filtrate per km of river bank can be produced for water supply. Comprehensive analysis of the river water and river bank filtrate as well as a pilot treatment of the bank filtrate suggest that aeration-oxidation-flocculation-filtration-disinfection is a suitable technology for the Tisa River bank filtrate.     

蓄冷板冻结与释冷的实验研究

通过实验的方式,分别研究了初始温度为30℃的Na Cl蓄冷板在-25、-35和-40℃的环境中的冻结过程以及初温度为-25℃的Na Cl蓄冷板在-10、-5和0℃环境中的释冷过程。实验结果表明:在冻结过程中,当环境温度低于Na Cl共晶液的共晶温度-21.2℃时,环境温度对共晶液开始结晶的时间有较大影响,而对共晶液从开始结晶至完全冻结过程所需时间影响较小;释冷过程中,环境温度高于Na Cl共晶液共晶温度-21.2℃时,外界环境对蓄冷板释冷所需时间以及共晶冰开始融化到完全融化的过程影响较大。     

基于树莓派的物联网开放平台

针对当前物联网所面对的共性需求,提出了建立开放性的物联网服务平台,为物联网世界提供开放的服务。完成了对传感器数据的接入、管理、存储、处理及应用。并以树莓派作为网关设备端进行图像数据的采集,通过Http或Socket.IO与云平台服务器建立连接,完成数据的实时传输。     

Juvenile gigantomastia: report of a case

This commentary focuses on the current workings of Medicare's Volume Performance Standards and possible alternatives that would make the program more effective in containing costs. The author presents his own perspectives as well as examining the options put forward in the two related papers by Holahan and Auckerman and Miller and Welch published in this issue of Inquiry.     

Spatially resolved photoelectric performance of axial GaAs nanowire pn-diodes

The spatially resolved photoelectric response of a single axial GaAs nanowire pn-diode has been investigated with scanning photocurrent and Kelvin probe force microscopy. Optical generation of carriers at the pn-junction has been shown to dominate the photoresponse. A photocurrent of 88 pA, an open circuit voltage of 0.56 V and a fill factor of 69% were obtained under AM 1.5 G conditions. The photocurrent followed the increasing photoexcitation with 0.24 A/W up to an illumination density of at least 90 W/cm², which is important for potential applications in concentrator solar cells.     

Transmutation by adiabatic resonance crossing experiment (TARC) benchmarking

In present study the benchmarking of TARC experiment was done. MCNPX code with JENDL-HE, JENDL-4, JENDL-3.3 and LA-150 nuclear data libraries were used for simulations. The calculated neutron fluences, energy-time correlations of resonance reactions and transmutation rates of ⁹⁹Tc and ^127,129I were compared with experimental measurements. On the base of comparative analysis of simulations the validation of nuclear data libraries was performed and recommendations were given, as follows:

–

the JENDL-4 library contains better neutron elastic cross-section data for natural lead in energy range from ∼0.01 eV to ∼100 eV comparing to other considered data libraries;     

Reconfigurable robotic machining system controlled and programmed in a machine tool manner

Industrial robots represent a promising cost-effective and flexible alternative for some machining applications. This paper describes the concept of reconfigurable robot multi-axis machining systems for machining the complex parts of light materials with lower tolerances having freeform surfaces. For the basic configuration of a five-axis robotic machining system, the robot modeling approach is shown in detail as well as the prototype of developed control system with programming in G-code. The experimental robotic machining system has been verified by successful machining of several test work pieces.     

不同氨基酸对模拟葡萄汁发酵的影响

该研究在酿酒酵母（Saccharomyces cerevisiae）发酵模拟葡萄汁进入稳定期时分别补加18种氨基酸,通过分析酿酒酵母生长、发酵速率以及最终乙醇、有机酸和高级醇含量的变化,比较不同氨基酸对葡萄酒发酵的影响。结果表明,丙氨酸（Ala）和缬氨酸（Val）能显著增加酿酒酵母的生物量和发酵速率以及最终乙醇和异丁醇含量（P＜0.05）,对有机酸含量影响较小。高质量浓度的半胱氨酸（Cys）（200 mg N/L）和赖氨酸（Lys）（200 mg N/L）抑制酿酒酵母生长和发酵速率,显著增加了有机酸含量（P＜0.05）。蛋氨酸（Met）抑制酿酒酵母的发酵速率,产生了大量的3-甲硫基丙醇。因此,对发酵有积极影响的Ala和Val比较适合作为葡萄酒酿造过程中的补加氮源,反之,Cys、Lys和Met不适合作为补加氮源。