Use of a laser for the spectral analysis of semiconductor materials

Conventional applications of lasers for emission spectroscopy involving direct recording of light pulses of an evaporated substance emitted from the sample under the action of the laser light (direct method) were examined. Use of the laser light for conversion of the substance to a vapor and feeding the vapors into the conventional source of emission such as arc, sparks, etc. (the so called 2 stage excitation) were studied for use in the spectral analysis, of semiconductors. The direct method has a high reproducibility (5-7%); the 2 stage excitation method, characterized by the same intensity as obtained with the conventional constant, current arc, has better reproducibility than the direct method (15-20%). Both methods can be used for the analysis of samples without prior preparation. Advantages of these methods are the elimination of impurities picked up during trituration of the samples into powders and shortening of the analytical procedures

Simulation of the IPTV systems multiservice data networks

Рассмотрены возможности использования методов визуального программного моделирования систем ІРТ? мультисервисной сети передачи данных в учебном процессе.Describes the possibility of using software simulation systems IPTV multiservice data network in the learning process

Memory Power Consumption in Main-Memory Database Systems

In main-memory database systems, memory can consume a substantial amount of power, comparable to that of the processors. However, existing memory power-saving mechanisms are much less effective than processor power management. Unless the system is almost idle, memory power consumption will be high. The reason for poor memory power proportionality is that the bulk of memory power consumption is attributable to background power, which is determined by memory power state residency. The memory workload in existing systems is evenly distributed over the memory modules and also in time, which precludes the occurrence of long idle intervals. As a result, deep low-power states, which could significantly reduce background power consumption, are rarely entered. In this work, we aim to reduce the memory power consumption of main-memory data- base systems. We start by investigating and explaining the patterns of memory power consumption, under various workloads. We then propose two techniques, implemented at the database system level, that skew memory traffic, creating long periods of idleness in a subset of memory modules. This allows those modules to enter low-power states, reducing overall memory power consumption. We prototyped these techniques in DimmStore, an experimental database system. The first technique is rate-aware data placement, which places data on memory modules according to its access frequency. The background power in the unused or least-used modules is reduced, without affecting background power in the most-used modules. Rate- aware placement saves power and has little performance impact. Under a TPC-C workload, rate-aware placement resulted in memory power savings up to 44%, with a maximum throughput reduction of 10%. The second technique is memory access gating, which targets background power in less- frequently accessed memory modules by inserting periodic idle intervals. Memory gating reduces power consumption of memory modules for which rate-aware placement alone does not create sufficient idleness to reduce power consumption. With gating, memory accesses to these modules become concentrated outside of the idle intervals, creating the opportunity for low-power state use. However, because it delays memory accesses, memory gating impacts performance. Higher memory power savings and lower performance impact occur in workloads with lower memory access rates. Thus, in the YCSB workload with a medium transaction rate, memory gating reduced memory power by 26%, adding 0.25 ms (30%) of transaction latency, compared to DimmStore without gating. In the more memory intensive TPC-C workload and low to medium transaction rate, gating can save 5% of memory power, adding 1.5 ms (60%) of transaction latency, compared to DimmStore without gating

The divine sphere according to John 3:1-10

According to the research, emphatic "Greek text" tells about confidence of Nicodemus in possession of trustworthy criteria, which allow him to judge what might be from God and, hence, what might not be from God. Epistemological premise of Nicodemus is the starting point for the whole conversation in Jn 3:1-21. Analysis of the Jewish literary tradition that used dualistic couples of antonyms to denote "otherness" of the divine sphere 1ms shown that ontological difference (v. 6) makes it impossible for human ("flesh") to know the divine sphere ("spirit"). This results in the fact that manifestations of the divine sphere (effect) are falsely taken by human for the divine sphere itself (cause). In other words, just verification of the divine sphere manifestation without initiative act on behalf of God does not allow human neither to correctly value this sphere, nor to enter it.New TestamentM. Th. (New Testament

Dynamic Scale-out Mechanisms for Partitioned Shared-Nothing Databases

For a database system used in pay-per-use cloud environments, elastic scaling becomes an essential feature, allowing for minimizing costs while accommodating fluctuations of load. One approach to scalability involves horizontal database partitioning and dynamic migration of partitions between servers. We define a scale-out operation as a combination of provisioning a new server followed by migration of one or more partitions to the newly-allocated server. In this thesis we study the efficiency of different implementations of the scale-out operation in the context of online transaction processing (OLTP) workloads. We designed and implemented three migration mechanisms featuring different strategies for data transfer. The first one is based on a modification of the Xen hypervisor, Snowflock, and uses on-demand block transfers for both server provisioning and partition migration. The second one is implemented in a database management system (DBMS) and uses bulk transfers for partition migration, optimized for higher bandwidth utilization. The third one is a conventional application, using SQL commands to copy partitions between servers. We perform an experimental comparison of those scale-out mechanisms for disk-bound and CPU-bound configurations. When comparing the mechanisms we analyze their impact on whole-system performance and on the experience of individual clients

Methods of identification parameters and state of ac - electrotechnical complexes mining shovels

Статья посвящена вопросам анализа методов идентификации параметров и состояния электроприводов переменного тока. Сравниваются прямые и косвенные способы измерения массы породы в ковше карьерных экскаваторов. Приводятся методы идентификации момента нагрузки электроприводов с асинхронными двигателями с короткозамкнутым ротором на основе градиентного поиска минимума функции, фильтров с конечной импульсной характеристикой, наблюдателей, оптимальной фильтрации Калмана и искусственных нейронных сетей.Article is devoted to the analysis of identification methods parameters and state of AC electric drives. Compares the direct and indirect measuring methods the mass of rocks in the bucket mining shovels. The methods of identifying the load torque of electric drives with asynchronous motors with squirrel-cage rotor based on gradient search of minimum functions, filters with finite impulse response, observers optimal Kalman filtering and artificial neural networks